Bumped version to 0.10.5

Change default data mid

.clang-format

@@ -10,5 +10,7 @@ AccessModifierOffset: -4
 ColumnLimit: 100
 ---
 Language: JavaScript
-ColumnLimit: 80
+IndentWidth: 2
+UseTab: Never
+ColumnLimit: 100
 ...

.editorconfig

@@ -9,3 +9,13 @@ insert_final_newline = true
 indent_style = tab
 indent_size = 4
 
+[*.js]
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.py]
+insert_final_newline = false
+indent_style = space
+indent_size = 4
+

.github/FUNDING.yml

@@ -0,0 +1,3 @@
+github: ['paullouisageneau']
+custom: ['https://paypal.me/paullouisageneau']
+

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "examples/web"
+    schedule:
+      interval: "weekly"

.github/workflows/build-gnutls.yml

@@ -0,0 +1,37 @@
+name: Build with GnuTLS
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libgnutls28-dev nettle-dev libsrtp2-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_GNUTLS=1 -DUSE_SYSTEM_SRTP=1 -DWARNINGS_AS_ERRORS=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: brew install gnutls nettle
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_GNUTLS=1 -DWARNINGS_AS_ERRORS=1 -DENABLE_LOCAL_ADDRESS_TRANSLATION=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests

.github/workflows/build-nice.yml

@@ -0,0 +1,38 @@
+name: Build with libnice
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build-media:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libgnutls28-dev libnice-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_GNUTLS=1 -DUSE_NICE=1 -DWARNINGS_AS_ERRORS=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-no-media:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libgnutls28-dev libnice-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_GNUTLS=1 -DUSE_NICE=1 -DNO_MEDIA=1 -DWARNINGS_AS_ERRORS=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+

.github/workflows/build-openssl.yml

@@ -0,0 +1,59 @@
+name: Build with OpenSSL
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libssl-dev libsrtp2-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_GNUTLS=0 -DUSE_SYSTEM_SRTP=1 -DWARNINGS_AS_ERRORS=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: HOMEBREW_NO_INSTALL_CLEANUP=1 brew reinstall openssl@1.1
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_GNUTLS=0 -WARNINGS_AS_ERRORS=1 -DENABLE_LOCAL_ADDRESS_TRANSLATION=1
+      env:
+        OPENSSL_ROOT_DIR: /usr/local/opt/openssl
+        OPENSSL_LIBRARIES: /usr/local/opt/openssl/lib
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-windows:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ilammy/msvc-dev-cmd@v1
+    - name: install packages
+      run: choco install openssl
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -G "NMake Makefiles" -DUSE_GNUTLS=0 -WARNINGS_AS_ERRORS=1
+    - name: nmake
+      run: |
+        cd build
+        set CL=/MP
+        nmake
+    - name: test
+      run: build/tests.exe
+

.gitignore

@@ -1,7 +1,10 @@
+build/
+node_modules/
 *.d
 *.o
 *.a
 *.so
 compile_commands.json
 tests
+.DS_Store
 

.gitmodules

@@ -1,3 +1,15 @@
+[submodule "deps/plog"]
+	path = deps/plog
+	url = https://github.com/paullouisageneau/plog
 [submodule "usrsctp"]
-	path = usrsctp
+	path = deps/usrsctp
 	url = https://github.com/sctplab/usrsctp.git
+[submodule "deps/libjuice"]
+	path = deps/libjuice
+	url = https://github.com/paullouisageneau/libjuice
+[submodule "deps/json"]
+	path = deps/json
+	url = https://github.com/nlohmann/json.git
+[submodule "deps/libsrtp"]
+	path = deps/libsrtp
+	url = https://github.com/cisco/libsrtp.git

CMakeLists.txt

@@ -0,0 +1,301 @@
+cmake_minimum_required(VERSION 3.7)
+project(libdatachannel
+	VERSION 0.10.5
+	LANGUAGES CXX)
+set(PROJECT_DESCRIPTION "WebRTC Data Channels Library")
+
+# Options
+option(USE_GNUTLS "Use GnuTLS instead of OpenSSL" OFF)
+option(USE_NICE "Use libnice instead of libjuice" OFF)
+option(USE_SYSTEM_SRTP "Use system libSRTP" OFF)
+option(NO_WEBSOCKET "Disable WebSocket support" OFF)
+option(NO_MEDIA "Disable media transport support" OFF)
+option(NO_EXAMPLES "Disable examples" OFF)
+option(NO_TESTS "Disable tests build" OFF)
+option(WARNINGS_AS_ERRORS "Treat warnings as errors" OFF)
+option(RSA_KEY_BITS_2048 "Use 2048-bit RSA key instead of 3072-bit" OFF)
+option(CAPI_STDCALL "Set calling convention of C API callbacks stdcall" OFF)
+
+if(USE_NICE)
+	option(USE_JUICE "Use libjuice" OFF)
+else()
+	option(USE_JUICE "Use libjuice" ON)
+endif()
+
+if(USE_GNUTLS)
+	option(USE_NETTLE "Use Nettle in libjuice" ON)
+else()
+	option(USE_NETTLE "Use Nettle in libjuice" OFF)
+	if(NOT USE_SYSTEM_SRTP)
+		option(ENABLE_OPENSSL "Enable OpenSSL crypto engine for SRTP" ON)
+	endif()
+endif()
+
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/Modules)
+set(BUILD_SHARED_LIBS OFF) # to force usrsctp to be built static
+
+if(WIN32)
+	add_definitions(-DWIN32_LEAN_AND_MEAN)
+	if(MSVC)
+		add_definitions(-DNOMINMAX)
+		add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+		add_definitions(-D_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING)
+	endif()
+endif()
+
+set(LIBDATACHANNEL_SOURCES
+	${CMAKE_CURRENT_SOURCE_DIR}/src/candidate.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/certificate.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/channel.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/configuration.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/datachannel.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/description.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/dtlssrtptransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/dtlstransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/icetransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/init.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/log.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/message.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/peerconnection.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/rtcp.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/sctptransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/threadpool.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tls.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/track.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/processor.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/capi.cpp
+)
+
+set(LIBDATACHANNEL_WEBSOCKET_SOURCES
+	${CMAKE_CURRENT_SOURCE_DIR}/src/base64.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tcptransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tlstransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/verifiedtlstransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/websocket.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/wstransport.cpp
+)
+
+set(LIBDATACHANNEL_HEADERS
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/candidate.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/channel.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/configuration.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/configuration.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/datachannel.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/description.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtcp.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/include.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/init.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/log.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/message.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/peerconnection.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/queue.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/reliability.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtc.h
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtc.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtp.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/track.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/websocket.hpp
+)
+
+set(TESTS_SOURCES
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/main.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/connectivity.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/track.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/capi_connectivity.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/capi_track.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/websocket.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/benchmark.cpp
+)
+
+set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
+set(THREADS_PREFER_PTHREAD_FLAG TRUE)
+find_package(Threads REQUIRED)
+
+set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
+add_subdirectory(deps/plog)
+
+option(sctp_build_programs 0)
+option(sctp_build_shared_lib 0)
+add_subdirectory(deps/usrsctp EXCLUDE_FROM_ALL)
+if (MSYS OR MINGW)
+	target_compile_definitions(usrsctp PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
+endif()
+if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+    target_compile_options(usrsctp PRIVATE -Wno-error=format-truncation)
+endif()
+add_library(Usrsctp::Usrsctp ALIAS usrsctp)
+
+if (NO_WEBSOCKET)
+	add_library(datachannel SHARED
+		${LIBDATACHANNEL_SOURCES})
+	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
+		${LIBDATACHANNEL_SOURCES})
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=0)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=0)
+else()
+	add_library(datachannel SHARED
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=1)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=1)
+endif()
+
+set_target_properties(datachannel PROPERTIES
+	VERSION ${PROJECT_VERSION}
+	CXX_STANDARD 17)
+set_target_properties(datachannel-static PROPERTIES
+	VERSION ${PROJECT_VERSION}
+	CXX_STANDARD 17)
+
+target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
+target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_link_libraries(datachannel PUBLIC Threads::Threads plog::plog)
+target_link_libraries(datachannel PRIVATE Usrsctp::Usrsctp)
+
+target_include_directories(datachannel-static PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
+target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_link_libraries(datachannel-static PUBLIC Threads::Threads plog::plog)
+target_link_libraries(datachannel-static PRIVATE Usrsctp::Usrsctp)
+
+if(WIN32)
+	target_link_libraries(datachannel PUBLIC ws2_32) # winsock2
+	target_link_libraries(datachannel-static PUBLIC ws2_32) # winsock2
+endif()
+
+if(NO_MEDIA)
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=0)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=0)
+else()
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=1)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=1)
+	if(USE_SYSTEM_SRTP)
+		find_package(SRTP REQUIRED)
+		if(NOT TARGET SRTP::SRTP)
+			add_library(SRTP::SRTP UNKNOWN IMPORTED)
+			set_target_properties(SRTP::SRTP PROPERTIES
+				INTERFACE_INCLUDE_DIRECTORIES ${SRTP_INCLUDE_DIRS}
+				IMPORTED_LINK_INTERFACE_LANGUAGES C
+				IMPORTED_LOCATION ${SRTP_LIBRARIES})
+		endif()
+		target_compile_definitions(datachannel PRIVATE RTC_SYSTEM_SRTP=1)
+		target_compile_definitions(datachannel-static PRIVATE RTC_SYSTEM_SRTP=1)
+		target_link_libraries(datachannel PRIVATE SRTP::SRTP)
+		target_link_libraries(datachannel-static PRIVATE SRTP::SRTP)
+	else()
+		add_subdirectory(deps/libsrtp EXCLUDE_FROM_ALL)
+		target_compile_definitions(datachannel PRIVATE RTC_SYSTEM_SRTP=0)
+		target_compile_definitions(datachannel-static PRIVATE RTC_SYSTEM_SRTP=0)
+		target_link_libraries(datachannel PRIVATE srtp2)
+		target_link_libraries(datachannel-static PRIVATE srtp2)
+	endif()
+endif()
+
+if (USE_GNUTLS)
+	find_package(GnuTLS REQUIRED)
+	if(NOT TARGET GnuTLS::GnuTLS)
+		add_library(GnuTLS::GnuTLS UNKNOWN IMPORTED)
+		set_target_properties(GnuTLS::GnuTLS PROPERTIES
+			INTERFACE_INCLUDE_DIRECTORIES "${GNUTLS_INCLUDE_DIRS}"
+			INTERFACE_COMPILE_DEFINITIONS "${GNUTLS_DEFINITIONS}"
+			IMPORTED_LINK_INTERFACE_LANGUAGES C
+			IMPORTED_LOCATION "${GNUTLS_LIBRARIES}")
+	endif()
+	target_compile_definitions(datachannel PRIVATE USE_GNUTLS=1)
+	target_compile_definitions(datachannel-static PRIVATE USE_GNUTLS=1)
+	target_link_libraries(datachannel PRIVATE GnuTLS::GnuTLS)
+	target_link_libraries(datachannel-static PRIVATE GnuTLS::GnuTLS)
+else()
+	find_package(OpenSSL REQUIRED)
+	target_compile_definitions(datachannel PRIVATE USE_GNUTLS=0)
+	target_compile_definitions(datachannel-static PRIVATE USE_GNUTLS=0)
+	target_link_libraries(datachannel PRIVATE OpenSSL::SSL)
+	target_link_libraries(datachannel-static PRIVATE OpenSSL::SSL)
+endif()
+
+if (USE_NICE OR NOT USE_JUICE)
+	find_package(LibNice REQUIRED)
+	target_compile_definitions(datachannel PRIVATE USE_NICE=1)
+	target_compile_definitions(datachannel-static PRIVATE USE_NICE=1)
+	target_link_libraries(datachannel PRIVATE LibNice::LibNice)
+	target_link_libraries(datachannel-static PRIVATE LibNice::LibNice)
+else()
+	add_subdirectory(deps/libjuice EXCLUDE_FROM_ALL)
+	target_compile_definitions(datachannel PRIVATE USE_NICE=0)
+	target_compile_definitions(datachannel-static PRIVATE USE_NICE=0)
+	target_link_libraries(datachannel PRIVATE LibJuice::LibJuiceStatic)
+	target_link_libraries(datachannel-static PRIVATE LibJuice::LibJuiceStatic)
+endif()
+
+if(RSA_KEY_BITS_2048)
+	target_compile_definitions(datachannel PUBLIC RSA_KEY_BITS_2048)
+	target_compile_definitions(datachannel-static PUBLIC RSA_KEY_BITS_2048)
+endif()
+
+if(CAPI_STDCALL)
+	target_compile_definitions(datachannel PUBLIC CAPI_STDCALL)
+	target_compile_definitions(datachannel-static PUBLIC CAPI_STDCALL)
+endif()
+
+add_library(LibDataChannel::LibDataChannel ALIAS datachannel)
+add_library(LibDataChannel::LibDataChannelStatic ALIAS datachannel-static)
+
+install(TARGETS datachannel LIBRARY DESTINATION lib)
+install(FILES ${LIBDATACHANNEL_HEADERS} DESTINATION include/rtc)
+
+if(NOT MSVC)
+	target_compile_options(datachannel PRIVATE -Wall -Wextra)
+	target_compile_options(datachannel-static PRIVATE -Wall -Wextra)
+endif()
+
+if(WARNINGS_AS_ERRORS)
+	if(MSVC)
+		target_compile_options(datachannel PRIVATE /WX)
+		target_compile_options(datachannel-static PRIVATE /WX)
+	else()
+		target_compile_options(datachannel PRIVATE -Werror)
+		target_compile_options(datachannel-static PRIVATE -Werror)
+	endif()
+endif()
+
+# Tests
+if(NOT NO_TESTS)
+	add_executable(datachannel-tests ${TESTS_SOURCES})
+	set_target_properties(datachannel-tests PROPERTIES
+		VERSION ${PROJECT_VERSION}
+		CXX_STANDARD 17)
+	if(NOT CMAKE_SYSTEM_NAME STREQUAL "WindowsStore") # Prevent a bug in manifest generation for UWP
+		set_target_properties(datachannel-tests PROPERTIES OUTPUT_NAME tests)
+	endif()
+	target_include_directories(datachannel-tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+	target_link_libraries(datachannel-tests datachannel)
+
+	# Benchmark
+	add_executable(datachannel-benchmark test/benchmark.cpp)
+	set_target_properties(datachannel-benchmark PROPERTIES
+		VERSION ${PROJECT_VERSION}
+		CXX_STANDARD 17)
+	if(NOT CMAKE_SYSTEM_NAME STREQUAL "WindowsStore") # Prevent a bug in manifest generation for UWP
+		set_target_properties(datachannel-benchmark PROPERTIES OUTPUT_NAME benchmark)
+	endif()
+	target_compile_definitions(datachannel-benchmark PRIVATE BENCHMARK_MAIN=1)
+	target_include_directories(datachannel-benchmark PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+	target_link_libraries(datachannel-benchmark datachannel)
+endif()
+
+# Examples
+if(NOT NO_EXAMPLES AND NOT CMAKE_SYSTEM_NAME STREQUAL "WindowsStore")
+	set(JSON_BuildTests OFF CACHE INTERNAL "")
+	add_subdirectory(deps/json)
+	add_subdirectory(examples/client)
+	add_subdirectory(examples/media)
+	add_subdirectory(examples/sfu-media)
+	add_subdirectory(examples/copy-paste)
+	add_subdirectory(examples/copy-paste-capi)
+endif()
+

Jamfile

@@ -0,0 +1,260 @@
+import feature : feature ;
+
+project libdatachannel ;
+path-constant CWD : . ;
+
+feature gnutls : off on : composite propagated ;
+feature.compose <gnutls>off
+    : <define>USE_GNUTLS=0 ;
+feature.compose <gnutls>on
+    : <define>USE_GNUTLS=1 ;
+
+lib libdatachannel
+	: # sources
+	[ glob ./src/*.cpp ]
+	: # requirements
+	<cxxstd>17
+	<include>./include/rtc
+	<define>RTC_ENABLE_MEDIA=0
+	<define>RTC_ENABLE_WEBSOCKET=0
+	<define>USE_NICE=0
+	<toolset>msvc:<define>WIN32_LEAN_AND_MEAN
+	<toolset>msvc:<define>NOMINMAX
+	<toolset>msvc:<define>_CRT_SECURE_NO_WARNINGS
+	<toolset>msvc:<define>_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
+	<library>/libdatachannel//usrsctp
+	<library>/libdatachannel//juice
+	<library>/libdatachannel//plog
+	<gnutls>on:<library>gnutls/<link>shared
+	<gnutls>off:<library>ssl
+	<gnutls>off:<library>crypto
+	: # default build
+	<link>static
+	: # usage requirements
+	<include>./include
+	<define>RTC_ENABLE_MEDIA=0
+	<define>RTC_ENABLE_WEBSOCKET=0
+	<library>/libdatachannel//plog
+	<toolset>gcc:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
+	<toolset>clang:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
+	;
+
+alias plog
+    : # no sources
+    : # no build requirements
+    : # no default build
+    : # usage requirements
+    <include>./deps/plog/include
+    ;
+
+alias usrsctp
+    : # no sources
+    : # no build requirements
+    : # no default build
+    : # usage requirements
+    <include>./deps/usrsctp/usrsctplib
+    <library>libusrsctp.a
+    ;
+
+alias usrsctp
+    : # no sources
+    : <toolset>msvc
+    : # no default build
+    : # usage requirements
+    <include>./deps/usrsctp/usrsctplib
+    <library>usrsctp.lib
+    ;
+
+alias juice
+    : # no sources
+    : # no build requirements
+    : # no default build
+    : # usage requirements
+    <include>./deps/libjuice/include
+    <gnutls>on:<library>libjuice-gnutls.a
+    <gnutls>on:<library>nettle/<link>shared
+    <gnutls>off:<library>libjuice-openssl.a
+    ;
+
+alias juice
+    : # no sources
+    : <toolset>msvc
+    : # no default build
+    : # usage requirements
+    <include>./deps/libjuice/include
+    <library>juice-static.lib
+    ;
+
+make libusrsctp.a : : @make_libusrsctp ;
+make usrsctp.lib : : @make_libusrsctp_msvc ;
+
+rule make_libusrsctp ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	VARIANT on $(targets) = $(VARIANT) ;
+	BUILD_DIR on $(targets) = "build-$(VARIANT)" ;
+}
+actions make_libusrsctp
+{
+    (cd $(CWD)/deps/usrsctp && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake -DCMAKE_BUILD_TYPE=$(VARIANT) -DCMAKE_C_FLAGS="-fPIC -Wno-unknown-warning-option -Wno-format-truncation" -Dsctp_build_shared_lib=0 -Dsctp_build_programs=0 .. && make -j2 usrsctp)
+    cp $(CWD)/deps/usrsctp/$(BUILD_DIR)/usrsctplib/libusrsctp.a $(<)
+}
+rule make_libusrsctp_msvc ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	VARIANT on $(targets) = $(VARIANT) ;
+	BUILD_DIR on $(targets) = "build-$(VARIANT)" ;
+}
+actions make_libusrsctp_msvc
+{
+	SET OLDD=%CD%
+    cd $(CWD)/deps/usrsctp
+    mkdir $(BUILD_DIR)
+    cd $(BUILD_DIR)
+    cmake -G "Visual Studio 16 2019" -Dsctp_build_shared_lib=0 -Dsctp_build_programs=0 ..
+    msbuild usrsctplib.sln /property:Configuration=$(VARIANT)
+    cd %OLDD%
+    cp $(CWD)/deps/usrsctp/$(BUILD_DIR)/usrsctplib/Release/usrsctp.lib $(<)
+}
+
+make libjuice-gnutls.a : : @make_libjuice_gnutls ;
+make libjuice-openssl.a : : @make_libjuice_openssl ;
+make juice-static.lib : : @make_libjuice_msvc ;
+
+rule make_libjuice_gnutls ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	BUILD_DIR on $(targets) = "build-gnutls-$(VARIANT)" ;
+	CMAKEOPTS on $(targets) = "-DCMAKE_C_FLAGS=\"-fPIC\" -DCMAKE_BUILD_TYPE=$(VARIANT) -DUSE_NETTLE=1" ;
+}
+actions make_libjuice_gnutls
+{
+    (cd $(CWD)/deps/libjuice && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake $(CMAKEOPTS) .. && make -j2 juice-static)
+    cp $(CWD)/deps/libjuice/$(BUILD_DIR)/libjuice-static.a $(<)
+}
+rule make_libjuice_openssl ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	BUILD_DIR on $(targets) = "build-openssl-$(VARIANT)" ;
+	CMAKEOPTS on $(targets) = "-DCMAKE_C_FLAGS=\"-fPIC\" -DCMAKE_BUILD_TYPE=$(VARIANT) -DUSE_NETTLE=0" ;
+
+	local OPENSSL_INCLUDE = [ feature.get-values <openssl-include> : $(properties) ] ;
+	if <target-os>darwin in $(properties) && $(OPENSSL_INCLUDE) = ""
+	{
+		# on macOS, default to pick up openssl from the homebrew installation
+		# brew install openssl
+		OPENSSL_INCLUDE = /usr/local/opt/openssl/include ;
+	}
+
+	if $(OPENSSL_INCLUDE) != ""
+	{ CMAKEOPTS on $(targets) += " -DOPENSSL_ROOT_DIR=$(OPENSSL_INCLUDE)/.." ; }
+}
+actions make_libjuice_openssl
+{
+    (cd $(CWD)/deps/libjuice && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake $(CMAKEOPTS) .. && make -j2 juice-static)
+    cp $(CWD)/deps/libjuice/$(BUILD_DIR)/libjuice-static.a $(<)
+}
+rule make_libjuice_msvc ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	VARIANT on $(targets) = $(VARIANT) ;
+	if <gnutls>on in $(properties)
+	{
+		BUILD_DIR on $(targets) += "build-gnutls-$(VARIANT)" ;
+		CMAKEOPTS on $(targets) = "-DUSE_NETTLE=1" ;
+	}
+	else
+	{
+		BUILD_DIR on $(targets) += "build-openssl-$(VARIANT)" ;
+		CMAKEOPTS on $(targets) = "-DUSE_NETTLE=0" ;
+	}
+}
+actions make_libjuice_msvc
+{
+	SET OLDD=%CD%
+    cd $(CWD)/deps/libjuice
+    mkdir $(BUILD_DIR)
+    cd $(BUILD_DIR)
+    cmake -G "Visual Studio 16 2019" $(CMAKEOPTS) ..
+    msbuild libjuice.sln /property:Configuration=$(VARIANT)
+    cd %OLDD%
+    cp $(CWD)/deps/libjuice/$(BUILD_DIR)/Release/juice-static.lib $(<)
+}
+
+# the search path to pick up the openssl libraries from. This is the <search>
+# property of those libraries
+rule openssl-lib-path ( properties * )
+{
+    local OPENSSL_LIB = [ feature.get-values <openssl-lib> : $(properties) ] ;
+
+    if <target-os>darwin in $(properties) && $(OPENSSL_LIB) = ""
+    {
+        # on macOS, default to pick up openssl from the homebrew installation
+        # brew install openssl
+        OPENSSL_LIB = /usr/local/opt/openssl/lib ;
+    }
+    else if <target-os>windows in $(properties) && $(OPENSSL_LIB) = ""
+    {
+        # on windows, assume openssl is installed to c:\OpenSSL-Win32
+        if <address-model>64 in $(properties)
+        { OPENSSL_LIB = c:\\OpenSSL-Win64\\lib ; }
+        else
+        { OPENSSL_LIB = c:\\OpenSSL-Win32\\lib ; }
+    }
+
+    local result ;
+    result += <search>$(OPENSSL_LIB) ;
+    return $(result) ;
+}
+
+# the include path to pick up openssl headers from. This is the
+# usage-requirement for the openssl-related libraries
+rule openssl-include-path ( properties * )
+{
+    local OPENSSL_INCLUDE = [ feature.get-values <openssl-include> : $(properties) ] ;
+
+    if <target-os>darwin in $(properties) && $(OPENSSL_INCLUDE) = ""
+    {
+        # on macOS, default to pick up openssl from the homebrew installation
+        # brew install openssl
+        OPENSSL_INCLUDE = /usr/local/opt/openssl/include ;
+    }
+    else if <target-os>windows in $(properties) && $(OPENSSL_INCLUDE) = ""
+    {
+        # on windows, assume openssl is installed to c:\OpenSSL-Win32
+        if <address-model>64 in $(properties)
+        { OPENSSL_INCLUDE = c:\\OpenSSL-Win64\\include ; }
+        else
+        { OPENSSL_INCLUDE = c:\\OpenSSL-Win32\\include ; }
+    }
+
+    local result ;
+    result += <include>$(OPENSSL_INCLUDE) ;
+    return $(result) ;
+}
+
+# libraries for OpenSSL on Windows
+lib advapi32 : : <name>advapi32 ;
+lib user32 : : <name>user32 ;
+lib shell32 : : <name>shell32 ;
+lib gdi32 : : <name>gdi32 ;
+lib bcrypt : : <name>bcrypt ;
+lib z : : <link>shared <name>z ;
+alias ssl-deps : advapi32 user32 shell32 gdi32 ;
+
+# OpenSSL on Windows
+lib crypto : ssl-deps : <toolset>msvc <openssl-version>1.1 <name>libcrypto
+    <conditional>@openssl-lib-path : : <conditional>@openssl-include-path ;
+lib ssl : ssl-deps : <toolset>msvc <openssl-version>1.1 <name>libssl <use>crypto
+    <conditional>@openssl-lib-path : : <conditional>@openssl-include-path ;
+
+# OpenSSL on other platforms
+lib crypto : : <name>crypto <use>z <conditional>@openssl-lib-path : :
+    <conditional>@openssl-include-path ;
+lib ssl : : <name>ssl <use>crypto <conditional>@openssl-lib-path : :
+    <conditional>@openssl-include-path ;
+
+# GnuTLS
+lib gnutls : : <link>shared <name>gnutls ;
+lib nettle : : <link>shared <name>nettle ;
+

Makefile

@@ -4,36 +4,83 @@ NAME=libdatachannel
 CXX=$(CROSS)g++
 AR=$(CROSS)ar
 RM=rm -f
-CPPFLAGS=-O2 -pthread -fPIC -Wall -Wno-address-of-packed-member
 CXXFLAGS=-std=c++17
+CPPFLAGS=-O2 -pthread -fPIC -Wall
 LDFLAGS=-pthread
-LDLIBS= -lgnutls $(shell pkg-config --libs glib-2.0 gobject-2.0 nice)
+LIBS=
-INCLUDES=-Iinclude/rtc -I$(USRSCTP_DIR)/usrsctplib $(shell pkg-config --cflags glib-2.0 gobject-2.0 nice)
+LOCALLIBS=libusrsctp.a
+USRSCTP_DIR=deps/usrsctp
+JUICE_DIR=deps/libjuice
+PLOG_DIR=deps/plog
 
-USRSCTP_DIR:=usrsctp
+INCLUDES=-Iinclude/rtc -I$(PLOG_DIR)/include -I$(USRSCTP_DIR)/usrsctplib
-USRSCTP_DEFINES:=-DINET -DINET6
+LDLIBS=
+
+USE_GNUTLS ?= 0
+ifneq ($(USE_GNUTLS), 0)
+        CPPFLAGS+=-DUSE_GNUTLS=1
+        LIBS+=gnutls
+else
+        CPPFLAGS+=-DUSE_GNUTLS=0
+        LIBS+=openssl
+endif
+
+USE_NICE ?= 0
+ifneq ($(USE_NICE), 0)
+        CPPFLAGS+=-DUSE_NICE=1
+        LIBS+=glib-2.0 gobject-2.0 nice
+else
+        CPPFLAGS+=-DUSE_NICE=0
+        INCLUDES+=-I$(JUICE_DIR)/include
+        LOCALLIBS+=libjuice.a
+ifneq ($(USE_GNUTLS), 0)
+        LIBS+=nettle
+endif
+endif
+
+USE_SRTP ?= 0
+ifneq ($(USE_SRTP), 0)
+        CPPFLAGS+=-DRTC_ENABLE_MEDIA=1
+        LIBS+=srtp
+else
+        CPPFLAGS+=-DRTC_ENABLE_MEDIA=0
+endif
+
+
+NO_WEBSOCKET ?= 0
+ifeq ($(NO_WEBSOCKET), 0)
+        CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=1
+else
+        CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=0
+endif
+
+INCLUDES+=$(shell pkg-config --cflags $(LIBS))
+LDLIBS+=$(LOCALLIBS) $(shell pkg-config --libs $(LIBS))
 
 SRCS=$(shell printf "%s " src/*.cpp)
 OBJS=$(subst .cpp,.o,$(SRCS))
 
+TEST_SRCS=$(shell printf "%s " test/*.cpp)
+TEST_OBJS=$(subst .cpp,.o,$(TEST_SRCS))
+
 all: $(NAME).a $(NAME).so tests
 
 src/%.o: src/%.cpp
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(INCLUDES) $(USRSCTP_DEFINES) -MMD -MP -o $@ -c $<
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(INCLUDES) -MMD -MP -o $@ -c $<
 
 test/%.o: test/%.cpp
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Iinclude -MMD -MP -o $@ -c $<
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(INCLUDES) -Iinclude -Isrc -MMD -MP -o $@ -c $<
 
 -include $(subst .cpp,.d,$(SRCS))
 
 $(NAME).a: $(OBJS)
 	$(AR) crf $@ $(OBJS)
 
-$(NAME).so: libusrsctp.a $(OBJS)
+$(NAME).so: $(LOCALLIBS) $(OBJS)
-	$(CXX) $(LDFLAGS) -shared -o $@ $(OBJS) $(LDLIBS) libusrsctp.a
+	$(CXX) $(LDFLAGS) -shared -o $@ $(OBJS) $(LDLIBS)
 
-tests: $(NAME).a test/main.o
+tests: $(NAME).a $(TEST_OBJS)
-	$(CXX) $(LDFLAGS) -o $@ test/main.o $(LDLIBS) $(NAME).a libusrsctp.a
+	$(CXX) $(LDFLAGS) -o $@ $(TEST_OBJS) $(NAME).a $(LDLIBS)
 
 clean:
 	-$(RM) include/rtc/*.d *.d
@@ -44,16 +91,26 @@ dist-clean: clean
 	-$(RM) $(NAME).a
 	-$(RM) $(NAME).so
 	-$(RM) libusrsctp.a
+	-$(RM) libjuice.a
 	-$(RM) tests
 	-$(RM) include/*~
 	-$(RM) src/*~
 	-$(RM) test/*~
 	-cd $(USRSCTP_DIR) && make clean
+	-cd $(JUICE_DIR) && make clean
 
 libusrsctp.a:
 	cd $(USRSCTP_DIR) && \
 		./bootstrap && \
-		./configure --enable-static --disable-debug CFLAGS="$(CPPFLAGS)" && \
+		./configure --enable-static --disable-debug CFLAGS="$(CPPFLAGS) -Wno-error=format-truncation" && \
 		make
 	cp $(USRSCTP_DIR)/usrsctplib/.libs/libusrsctp.a .
 
+libjuice.a:
+ifneq ($(USE_GNUTLS), 0)
+	cd $(JUICE_DIR) && make USE_NETTLE=1
+else
+	cd $(JUICE_DIR) && make USE_NETTLE=0
+endif
+	cp $(JUICE_DIR)/libjuice.a .
+

README.md

@@ -1,6 +1,9 @@
-# libdatachannel - C/C++ WebRTC DataChannels
+# libdatachannel - C/C++ WebRTC Data Channels
 
-libdatachannel is a standalone implementation of WebRTC DataChannels in C++17 with C bindings. It enables direct connectivity between native applications and web browsers without the pain of importing the entire WebRTC stack. Its API is modelled as a simplified version of the JavaScript WebRTC API, in order to ease the design of cross-environment applications.
+libdatachannel is a standalone implementation of WebRTC Data Channels, WebRTC Media Transport, and WebSockets in C++17 with C bindings for POSIX platforms (including GNU/Linux, Android, and Apple macOS) and Microsoft Windows. It enables direct connectivity between native applications and web browsers without the pain of importing the entire WebRTC stack. The interface consists of simplified versions of the JavaScript WebRTC and WebSocket APIs present in browsers, in order to ease the design of cross-environment applications.
+It can be compiled with multiple backends:
+- The security layer can be provided through [OpenSSL](https://www.openssl.org/) or [GnuTLS](https://www.gnutls.org/).
+- The connectivity for WebRTC can be provided through my ad-hoc ICE library [libjuice](https://github.com/paullouisageneau/libjuice) as submodule or through [libnice](https://github.com/libnice/libnice).
 
 This projet is originally inspired by [librtcdcpp](https://github.com/chadnickbok/librtcdcpp), however it is a complete rewrite from scratch, because the messy architecture of librtcdcpp made solving its implementation issues difficult.
 
@@ -8,26 +11,128 @@ Licensed under LGPLv2, see [LICENSE](https://github.com/paullouisageneau/libdata
 
 ## Compatibility
 
-This implementation has been tested to be compatible with Firefox and Chromium. It supports Multicast DNS candidates resolution provided the operating system also supports it.
+The library aims at implementing the following communication protocols:
+
+### WebRTC Data Channels and Media Transport
+
+The WebRTC stack has been tested to be compatible with Firefox and Chromium.
+
+Protocol stack:
+- SCTP-based Data Channels ([draft-ietf-rtcweb-data-channel-13](https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-13))
+- SRTP-based Media Transport ([draft-ietf-rtcweb-rtp-usage-26](https://tools.ietf.org/html/draft-ietf-rtcweb-rtp-usage-26))
+- DTLS/UDP ([RFC7350](https://tools.ietf.org/html/rfc7350) and [RFC8261](https://tools.ietf.org/html/rfc8261))
+- ICE ([RFC8445](https://tools.ietf.org/html/rfc8445)) with STUN ([RFC5389](https://tools.ietf.org/html/rfc5389))
+
+Features:
+- Full IPv6 support
+- Trickle ICE ([draft-ietf-ice-trickle-21](https://tools.ietf.org/html/draft-ietf-ice-trickle-21))
+- JSEP compatible ([draft-ietf-rtcweb-jsep-26](https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-26))
+- Multicast DNS candidates ([draft-ietf-rtcweb-mdns-ice-candidates-04](https://tools.ietf.org/html/draft-ietf-rtcweb-mdns-ice-candidates-04))
+- SRTP and SRTCP key derivation from DTLS ([RFC5764](https://tools.ietf.org/html/rfc5764))
+- Differentiated Services QoS ([draft-ietf-tsvwg-rtcweb-qos-18](https://tools.ietf.org/html/draft-ietf-tsvwg-rtcweb-qos-18))
+- TURN relaying ([RFC5766](https://tools.ietf.org/html/rfc5766)) with [libnice](https://github.com/libnice/libnice) as ICE backend
+
+Note only SDP BUNDLE mode is supported for media multiplexing ([draft-ietf-mmusic-sdp-bundle-negotiation-54](https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-54)). The behavior is equivalent to the JSEP bundle-only policy: the library always negociates one unique network component, where SRTP media streams are multiplexed with SRTCP control packets ([RFC5761](https://tools.ietf.org/html/rfc5761)) and SCTP/DTLS data traffic ([RFC5764](https://tools.ietf.org/html/rfc5764)).
+
+### WebSocket
+
+WebSocket is the protocol of choice for WebRTC signaling. The support is optional and can be disabled at compile time.
+
+Protocol stack:
+- WebSocket protocol ([RFC6455](https://tools.ietf.org/html/rfc6455)), client-side only
+- HTTP over TLS ([RFC2818](https://tools.ietf.org/html/rfc2818))
+
+Features:
+- IPv6 and IPv4/IPv6 dual-stack support
+- Keepalive with ping/pong
 
 ## Dependencies
 
-- libnice: https://github.com/libnice/libnice
+Dependencies:
-- GnuTLS: https://www.gnutls.org/
+- GnuTLS: https://www.gnutls.org/ or OpenSSL: https://www.openssl.org/
 
 Submodules:
+- libjuice: https://github.com/paullouisageneau/libjuice
 - usrsctp: https://github.com/sctplab/usrsctp
+- libsrtp: https://github.com/cisco/libsrtp
+
+Optional dependencies:
+- libnice: https://nice.freedesktop.org/ (if selected as ICE backend instead of libjuice)
+- libsrtp: https://github.com/cisco/libsrtp (if selected instead of the submodule)
 
 ## Building
 
+### Clone repository and submodules
+
 ```bash
-git submodule update --init --recursive
+$ git clone https://github.com/paullouisageneau/libdatachannel.git
-make
+$ cd libdatachannel
+$ git submodule update --init --recursive
 ```
 
-## Example
+### Building with CMake
 
-In the following example, notes the callbacks are called in another thread.
+The CMake library targets `libdatachannel` and `libdatachannel-static` respectively correspond to the shared and static libraries. The default target will build tests and examples. The option `USE_GNUTLS` allows to switch between OpenSSL (default) and GnuTLS, and the option `USE_NICE` allows to switch between libjuice as submodule (default) and libnice.
+
+On Windows, the DLL resulting from the shared library build only exposes the C API, use the static library for the C++ API.
+
+#### POSIX-compliant operating systems (including Linux and Apple macOS)
+```bash
+$ cmake -B build -DUSE_GNUTLS=1 -DUSE_NICE=0
+$ cd build
+$ make -j2
+```
+
+#### Apple macOS with XCode project
+
+```bash
+$ cmake -B "$BUILD_DIR" -DUSE_GNUTLS=0 -DUSE_NICE=0 -G Xcode
+```
+
+Xcode project is generated in *build/* directory.
+
+##### Solving **Could NOT find OpenSSL** error
+
+You need to add OpenSSL root directory if your build fails with the following message:
+
+```
+Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the
+system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY
+OPENSSL_INCLUDE_DIR)
+```
+
+for example:
+```bash
+$ cmake -B build -DUSE_GNUTLS=0 -DUSE_NICE=0 -G Xcode -DOPENSSL_ROOT_DIR=/usr/local/Cellar/openssl\@1.1/1.1.1h/
+```
+
+#### Microsoft Windows with MinGW cross-compilation
+```bash
+$ cmake -B build -DCMAKE_TOOLCHAIN_FILE=/usr/share/mingw/toolchain-x86_64-w64-mingw32.cmake # replace with your toolchain file
+$ cd build
+$ make -j2
+```
+
+#### Microsoft Windows with Microsoft Visual C++
+```bash
+$ cmake -B build -G "NMake Makefiles"
+$ cd build
+$ nmake
+```
+
+### Building directly with Make (Linux only)
+
+The option `USE_GNUTLS` allows to switch between OpenSSL (default) and GnuTLS, and the option `USE_NICE` allows to switch between libjuice as submodule (default) and libnice.
+
+```bash
+$ make USE_GNUTLS=1 USE_NICE=0
+```
+
+## Examples
+
+See [examples](https://github.com/paullouisageneau/libdatachannel/blob/master/examples/) for a complete usage example with signaling server (under GPLv2).
+
+Additionnaly, you might want to have a look at the [C API](https://github.com/paullouisageneau/libdatachannel/blob/master/include/rtc/rtc.h).
 
 ### Signal a PeerConnection
 
@@ -37,21 +142,18 @@ In the following example, notes the callbacks are called in another thread.
 
 ```cpp
 rtc::Configuration config;
-config.iceServers.emplace_back("stunserver.org:3478");
+config.iceServers.emplace_back("mystunserver.org:3478");
 
 auto pc = make_shared<rtc::PeerConnection>(config);
 
-pc->onLocalDescription([](const rtc::Description &sdp) {
+pc->onLocalDescription([](rtc::Description sdp) {
     // Send the SDP to the remote peer
     MY_SEND_DESCRIPTION_TO_REMOTE(string(sdp));
 });
 
-pc->onLocalCandidate([](const optional<rtc::Candidate> &candidate) {
+pc->onLocalCandidate([](rtc::Candidate candidate) {
-    if (candidate) {
+    // Send the candidate to the remote peer
-        MY_SEND_CANDIDATE_TO_REMOTE(candidate->candidate(), candidate->mid());
+    MY_SEND_CANDIDATE_TO_REMOTE(candidate.candidate(), candidate.mid());
-    } else {
-        // Gathering finished
-    }
 });
 
 MY_ON_RECV_DESCRIPTION_FROM_REMOTE([pc](string sdp) {
@@ -63,14 +165,29 @@ MY_ON_RECV_CANDIDATE_FROM_REMOTE([pc](string candidate, string mid) {
 });
 ```
 
+### Observe the PeerConnection state
+
+```cpp
+pc->onStateChange([](PeerConnection::State state) {
+    cout << "State: " << state << endl;
+});
+
+pc->onGatheringStateChange([](PeerConnection::GatheringState state) {
+    cout << "Gathering state: " << state << endl;
+});
+
+```
+
 ### Create a DataChannel
 
 ```cpp
 auto dc = pc->createDataChannel("test");
+
 dc->onOpen([]() {
     cout << "Open" << endl;
 });
-dc->onMessage([](const variant<binary, string> &message) {
+
+dc->onMessage([](variant<binary, string> message) {
     if (holds_alternative<string>(message)) {
         cout << "Received: " << get<string>(message) << endl;
     }
@@ -81,12 +198,35 @@ dc->onMessage([](const variant<binary, string> &message) {
 
 ```cpp
 shared_ptr<rtc::DataChannel> dc;
-pc->onDataChannel([&dc](const shared_ptr<rtc::DataChannel> &incoming) {
+pc->onDataChannel([&dc](shared_ptr<rtc::DataChannel> incoming) {
     dc = incoming;
     dc->send("Hello world!");
 });
 
 ```
 
-See [test/main.cpp](https://github.com/paullouisageneau/libdatachannel/blob/master/test/main.cpp) for a complete local connection example.
+### Open a WebSocket
+
+```cpp
+auto ws = make_shared<rtc::WebSocket>();
+
+ws->onOpen([]() {
+	cout << "WebSocket open" << endl;
+});
+
+ws->onMessage([](variant<binary, string> message) {
+    if (holds_alternative<string>(message)) {
+        cout << "WebSocket received: " << get<string>(message) << endl;
+    }
+});
+
+ws->open("wss://my.websocket/service");
+
+```
+
+## External resources
+- Rust wrapper for libdatachannel: [datachannel-rs](https://github.com/lerouxrgd/datachannel-rs)
+- Node.js wrapper for libdatachannel: [node-datachannel](https://github.com/murat-dogan/node-datachannel)
+- Unity wrapper for Windows 10 and Hololens: [datachannel-unity](https://github.com/hanseuljun/datachannel-unity)
+- WebAssembly wrapper compatible with libdatachannel: [datachannel-wasm](https://github.com/paullouisageneau/datachannel-wasm)
 

cmake/Modules/FindGLIB.cmake

@@ -0,0 +1,123 @@
+# - Try to find Glib and its components (gio, gobject etc)
+# Once done, this will define
+#
+#  GLIB_FOUND - system has Glib
+#  GLIB_INCLUDE_DIRS - the Glib include directories
+#  GLIB_LIBRARIES - link these to use Glib
+#
+# Optionally, the COMPONENTS keyword can be passed to find_package()
+# and Glib components can be looked for.  Currently, the following
+# components can be used, and they define the following variables if
+# found:
+#
+#  gio:             GLIB_GIO_LIBRARIES
+#  gobject:         GLIB_GOBJECT_LIBRARIES
+#  gmodule:         GLIB_GMODULE_LIBRARIES
+#  gthread:         GLIB_GTHREAD_LIBRARIES
+#
+# Note that the respective _INCLUDE_DIR variables are not set, since
+# all headers are in the same directory as GLIB_INCLUDE_DIRS.
+#
+# Copyright (C) 2012 Raphael Kubo da Costa <rakuco@webkit.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1.  Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+# 2.  Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND ITS CONTRIBUTORS ``AS
+# IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR ITS
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+find_package(PkgConfig)
+pkg_check_modules(PC_GLIB QUIET glib-2.0)
+
+find_library(GLIB_LIBRARIES
+    NAMES glib-2.0
+    HINTS ${PC_GLIB_LIBDIR}
+          ${PC_GLIB_LIBRARY_DIRS}
+)
+
+# Files in glib's main include path may include glibconfig.h, which,
+# for some odd reason, is normally in $LIBDIR/glib-2.0/include.
+get_filename_component(_GLIB_LIBRARY_DIR ${GLIB_LIBRARIES} PATH)
+find_path(GLIBCONFIG_INCLUDE_DIR
+    NAMES glibconfig.h
+    HINTS ${PC_LIBDIR} ${PC_LIBRARY_DIRS} ${_GLIB_LIBRARY_DIR}
+          ${PC_GLIB_INCLUDEDIR} ${PC_GLIB_INCLUDE_DIRS}
+    PATH_SUFFIXES glib-2.0/include
+)
+
+find_path(GLIB_INCLUDE_DIR
+    NAMES glib.h
+    HINTS ${PC_GLIB_INCLUDEDIR}
+          ${PC_GLIB_INCLUDE_DIRS}
+    PATH_SUFFIXES glib-2.0
+)
+
+set(GLIB_INCLUDE_DIRS ${GLIB_INCLUDE_DIR} ${GLIBCONFIG_INCLUDE_DIR})
+
+# Version detection
+if (EXISTS "${GLIBCONFIG_INCLUDE_DIR}/glibconfig.h")
+    file(READ "${GLIBCONFIG_INCLUDE_DIR}/glibconfig.h" GLIBCONFIG_H_CONTENTS)
+    string(REGEX MATCH "#define GLIB_MAJOR_VERSION ([0-9]+)" _dummy "${GLIBCONFIG_H_CONTENTS}")
+    set(GLIB_VERSION_MAJOR "${CMAKE_MATCH_1}")
+    string(REGEX MATCH "#define GLIB_MINOR_VERSION ([0-9]+)" _dummy "${GLIBCONFIG_H_CONTENTS}")
+    set(GLIB_VERSION_MINOR "${CMAKE_MATCH_1}")
+    string(REGEX MATCH "#define GLIB_MICRO_VERSION ([0-9]+)" _dummy "${GLIBCONFIG_H_CONTENTS}")
+    set(GLIB_VERSION_MICRO "${CMAKE_MATCH_1}")
+    set(GLIB_VERSION "${GLIB_VERSION_MAJOR}.${GLIB_VERSION_MINOR}.${GLIB_VERSION_MICRO}")
+endif ()
+
+# Additional Glib components.  We only look for libraries, as not all of them
+# have corresponding headers and all headers are installed alongside the main
+# glib ones.
+foreach (_component ${GLIB_FIND_COMPONENTS})
+    if (${_component} STREQUAL "gio")
+        find_library(GLIB_GIO_LIBRARIES NAMES gio-2.0 HINTS ${_GLIB_LIBRARY_DIR})
+        set(ADDITIONAL_REQUIRED_VARS ${ADDITIONAL_REQUIRED_VARS} GLIB_GIO_LIBRARIES)
+    elseif (${_component} STREQUAL "gobject")
+        find_library(GLIB_GOBJECT_LIBRARIES NAMES gobject-2.0 HINTS ${_GLIB_LIBRARY_DIR})
+        set(ADDITIONAL_REQUIRED_VARS ${ADDITIONAL_REQUIRED_VARS} GLIB_GOBJECT_LIBRARIES)
+    elseif (${_component} STREQUAL "gmodule")
+        find_library(GLIB_GMODULE_LIBRARIES NAMES gmodule-2.0 HINTS ${_GLIB_LIBRARY_DIR})
+        set(ADDITIONAL_REQUIRED_VARS ${ADDITIONAL_REQUIRED_VARS} GLIB_GMODULE_LIBRARIES)
+    elseif (${_component} STREQUAL "gthread")
+        find_library(GLIB_GTHREAD_LIBRARIES NAMES gthread-2.0 HINTS ${_GLIB_LIBRARY_DIR})
+        set(ADDITIONAL_REQUIRED_VARS ${ADDITIONAL_REQUIRED_VARS} GLIB_GTHREAD_LIBRARIES)
+    elseif (${_component} STREQUAL "gio-unix")
+        # gio-unix is compiled as part of the gio library, but the include paths
+        # are separate from the shared glib ones. Since this is currently only used
+        # by WebKitGTK we don't go to extraordinary measures beyond pkg-config.
+        pkg_check_modules(GIO_UNIX QUIET gio-unix-2.0)
+    endif ()
+endforeach ()
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(GLIB REQUIRED_VARS GLIB_INCLUDE_DIRS GLIB_LIBRARIES ${ADDITIONAL_REQUIRED_VARS}
+                                       VERSION_VAR   GLIB_VERSION)
+
+mark_as_advanced(
+    GLIBCONFIG_INCLUDE_DIR
+    GLIB_GIO_LIBRARIES
+    GLIB_GIO_UNIX_LIBRARIES
+    GLIB_GMODULE_LIBRARIES
+    GLIB_GOBJECT_LIBRARIES
+    GLIB_GTHREAD_LIBRARIES
+    GLIB_INCLUDE_DIR
+    GLIB_INCLUDE_DIRS
+    GLIB_LIBRARIES
+)
+

cmake/Modules/FindLibNice.cmake

@@ -0,0 +1,35 @@
+if (NOT TARGET LibNice::LibNice)
+    find_package(PkgConfig)
+    pkg_check_modules(PC_LIBNICE nice)
+    set(LIBNICE_DEFINITIONS ${PC_LIBNICE_CFLAGS_OTHER})
+
+    find_path(LIBNICE_INCLUDE_DIR nice/agent.h
+            HINTS ${PC_LIBNICE_INCLUDEDIR} ${PC_LIBNICE_INCLUDE_DIRS}
+            PATH_SUFFICES libnice)
+    find_library(LIBNICE_LIBRARY NAMES nice libnice
+            HINTS ${PC_LIBNICE_LIBDIR} ${PC_LIBNICE_LIBRARY_DIRS})
+
+    include(FindPackageHandleStandardArgs)
+    find_package_handle_standard_args(LibNice DEFAULT_MSG
+            LIBNICE_LIBRARY LIBNICE_INCLUDE_DIR)
+    mark_as_advanced(LIBNICE_INCLUDE_DIR LIBNICE_LIBRARY)
+
+    set(LIBNICE_LIBRARIES ${LIBNICE_LIBRARY})
+    set(LIBNICE_INCLUDE_DIRS ${LIBNICE_INCLUDE_DIR})
+
+    find_package(GLIB REQUIRED COMPONENTS gio gobject gmodule gthread)
+
+    list(APPEND LIBNICE_INCLUDE_DIRS ${GLIB_INCLUDE_DIRS})
+    list(APPEND LIBNICE_LIBRARIES ${GLIB_GOBJECT_LIBRARIES} ${GLIB_LIBRARIES})
+
+    if (LIBNICE_FOUND)
+        add_library(LibNice::LibNice UNKNOWN IMPORTED)
+        set_target_properties(LibNice::LibNice PROPERTIES
+                IMPORTED_LOCATION "${LIBNICE_LIBRARY}"
+                INTERFACE_COMPILE_DEFINITIONS "_REENTRANT"
+                INTERFACE_INCLUDE_DIRECTORIES "${LIBNICE_INCLUDE_DIRS}"
+                INTERFACE_LINK_LIBRARIES "${LIBNICE_LIBRARIES}"
+                IMPORTED_LINK_INTERFACE_LANGUAGES "C")
+    endif ()
+endif ()
+

cmake/Modules/FindSRTP.cmake

@@ -0,0 +1,73 @@
+############################################################################
+# FindSRTP.txt
+# Copyright (C) 2014  Belledonne Communications, Grenoble France
+#
+############################################################################
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+############################################################################
+#
+# - Find the SRTP include file and library
+#
+#  SRTP_FOUND - system has SRTP
+#  SRTP_INCLUDE_DIRS - the SRTP include directory
+#  SRTP_LIBRARIES - The libraries needed to use SRTP
+
+set(_SRTP_ROOT_PATHS
+	${CMAKE_INSTALL_PREFIX}
+)
+
+find_path(SRTP2_INCLUDE_DIRS
+	NAMES srtp2/srtp.h
+	HINTS _SRTP_ROOT_PATHS
+	PATH_SUFFIXES include
+)
+
+if(SRTP2_INCLUDE_DIRS)
+	set(HAVE_SRTP_SRTP_H 1)
+	set(SRTP_INCLUDE_DIRS ${SRTP2_INCLUDE_DIRS})
+	set(SRTP_VERSION 2)
+	find_library(SRTP_LIBRARIES
+		NAMES srtp2
+		HINTS ${_SRTP_ROOT_PATHS}
+		PATH_SUFFIXES bin lib
+	)
+else()
+	find_path(SRTP_INCLUDE_DIRS
+		NAMES srtp/srtp.h
+		HINTS _SRTP_ROOT_PATHS
+		PATH_SUFFIXES include
+	)
+	if(SRTP_INCLUDE_DIRS)
+		set(HAVE_SRTP_SRTP_H 1)
+		set(SRTP_VERSION 1)
+	endif()
+	find_library(SRTP_LIBRARIES
+	NAMES srtp
+	HINTS ${_SRTP_ROOT_PATHS}
+	PATH_SUFFIXES bin lib
+)
+endif()
+
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SRTP
+	DEFAULT_MSG
+	SRTP_INCLUDE_DIRS SRTP_LIBRARIES HAVE_SRTP_SRTP_H SRTP_VERSION
+)
+
+mark_as_advanced(SRTP_INCLUDE_DIRS SRTP_LIBRARIES HAVE_SRTP_SRTP_H SRTP_VERSION)
+

examples/README.md

@@ -0,0 +1,15 @@
+# Examples for libdatachannel
+
+This directory contains different WebRTC clients and compatible WebSocket + JSON signaling servers.
+
+- [client](client) uses libdatachannel to implement WebRTC Data Channels with WebSocket signaling
+- [web](web) contains an equivalent implementation for web browsers and a node.js signaling server
+- [signaling-server-python](signaling-server-python) contains a similar signaling server in Python
+- [signaling-server-rust](signaling-server-rust) contains a similar signaling server in Rust (see [lerouxrgd/datachannel-rs](https://github.com/lerouxrgd/datachannel-rs) for Rust wrappers)
+
+- [media](media) is a copy/paste demo to send the webcam from your browser into gstreamer.
+
+Additionally, it contains two debugging tools for libdatachannel with copy-pasting as signaling:
+- [copy-paste](copy-paste) using the C++ API
+- [copy-paste-capi](copy-paste-capi) using the C API
+

examples/client/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.7)
+if(POLICY CMP0079)
+	cmake_policy(SET CMP0079 NEW)
+endif()
+
+if(WIN32)
+add_executable(datachannel-client main.cpp parse_cl.cpp parse_cl.h getopt.cpp getopt.h)
+target_compile_definitions(datachannel-client PUBLIC STATIC_GETOPT)
+else()
+add_executable(datachannel-client main.cpp parse_cl.cpp parse_cl.h)
+endif()
+
+set_target_properties(datachannel-client PROPERTIES
+	CXX_STANDARD 17
+	OUTPUT_NAME client)
+target_link_libraries(datachannel-client datachannel nlohmann_json)
+

examples/client/LICENSE

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
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+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
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+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
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+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
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+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
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+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
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+
+If distribution of executable or object code is made by offering
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+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
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+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
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+
+  7. If, as a consequence of a court judgment or allegation of patent
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+
+If any portion of this section is held invalid or unenforceable under
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+
+It is not the purpose of this section to induce you to infringe any
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+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
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+original copyright holder who places the Program under this License
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+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
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+
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+
+  10. If you wish to incorporate parts of the Program into other free
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+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
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+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

examples/client/getopt.cpp

@@ -0,0 +1,513 @@
+/* Getopt for Microsoft C
+This code is a modification of the Free Software Foundation, Inc.
+Getopt library for parsing command line argument the purpose was
+to provide a Microsoft Visual C friendly derivative. This code
+provides functionality for both Unicode and Multibyte builds.
+
+Date: 02/03/2011 - Ludvik Jerabek - Initial Release
+Version: 1.0
+Comment: Supports getopt, getopt_long, and getopt_long_only
+and POSIXLY_CORRECT environment flag
+License: LGPL
+
+Revisions:
+
+02/03/2011 - Ludvik Jerabek - Initial Release
+02/20/2011 - Ludvik Jerabek - Fixed compiler warnings at Level 4
+07/05/2011 - Ludvik Jerabek - Added no_argument, required_argument, optional_argument defs
+08/03/2011 - Ludvik Jerabek - Fixed non-argument runtime bug which caused runtime exception
+08/09/2011 - Ludvik Jerabek - Added code to export functions for DLL and LIB
+02/15/2012 - Ludvik Jerabek - Fixed _GETOPT_THROW definition missing in implementation file
+08/01/2012 - Ludvik Jerabek - Created separate functions for char and wchar_t characters so single dll can do both unicode and ansi
+10/15/2012 - Ludvik Jerabek - Modified to match latest GNU features
+06/19/2015 - Ludvik Jerabek - Fixed maximum option limitation caused by option_a (255) and option_w (65535) structure val variable
+24/10/2020 - Paul-Louis Ageneau - Removed Unicode version
+
+**DISCLAIMER**
+THIS MATERIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+EITHER EXPRESS OR IMPLIED, INCLUDING, BUT Not LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE, OR NON-INFRINGEMENT. SOME JURISDICTIONS DO NOT ALLOW THE
+EXCLUSION OF IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT
+APPLY TO YOU. IN NO EVENT WILL I BE LIABLE TO ANY PARTY FOR ANY
+DIRECT, INDIRECT, SPECIAL OR OTHER CONSEQUENTIAL DAMAGES FOR ANY
+USE OF THIS MATERIAL INCLUDING, WITHOUT LIMITATION, ANY LOST
+PROFITS, BUSINESS INTERRUPTION, LOSS OF PROGRAMS OR OTHER DATA ON
+YOUR INFORMATION HANDLING SYSTEM OR OTHERWISE, EVEN If WE ARE
+EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+*/
+
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <malloc.h>
+#include "getopt.h"
+
+#ifdef __cplusplus
+	#define _GETOPT_THROW throw()
+#else
+	#define _GETOPT_THROW
+#endif
+
+int optind = 1;
+int opterr = 1;
+int optopt = '?';
+enum ENUM_ORDERING { REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER };
+
+static struct _getopt_data_a
+{
+	int optind;
+	int opterr;
+	int optopt;
+	char *optarg;
+	int __initialized;
+	char *__nextchar;
+	enum ENUM_ORDERING __ordering;
+	int __posixly_correct;
+	int __first_nonopt;
+	int __last_nonopt;
+} getopt_data_a;
+char *optarg_a;
+
+static void exchange_a(char **argv, struct _getopt_data_a *d)
+{
+	int bottom = d->__first_nonopt;
+	int middle = d->__last_nonopt;
+	int top = d->optind;
+	char *tem;
+	while (top > middle && middle > bottom)
+	{
+		if (top - middle > middle - bottom)
+		{
+			int len = middle - bottom;
+			int i;
+			for (i = 0; i < len; i++)
+			{
+				tem = argv[bottom + i];
+				argv[bottom + i] = argv[top - (middle - bottom) + i];
+				argv[top - (middle - bottom) + i] = tem;
+			}
+			top -= len;
+		}
+		else
+		{
+			int len = top - middle;
+			int i;
+			for (i = 0; i < len; i++)
+			{
+				tem = argv[bottom + i];
+				argv[bottom + i] = argv[middle + i];
+				argv[middle + i] = tem;
+			}
+			bottom += len;
+		}
+	}
+	d->__first_nonopt += (d->optind - d->__last_nonopt);
+	d->__last_nonopt = d->optind;
+}
+static const char *_getopt_initialize_a (const char *optstring, struct _getopt_data_a *d, int posixly_correct)
+{
+	d->__first_nonopt = d->__last_nonopt = d->optind;
+	d->__nextchar = NULL;
+	d->__posixly_correct = posixly_correct | !!getenv("POSIXLY_CORRECT");
+	if (optstring[0] == '-')
+	{
+		d->__ordering = RETURN_IN_ORDER;
+		++optstring;
+	}
+	else if (optstring[0] == '+')
+	{
+		d->__ordering = REQUIRE_ORDER;
+		++optstring;
+	}
+	else if (d->__posixly_correct)
+		d->__ordering = REQUIRE_ORDER;
+	else
+		d->__ordering = PERMUTE;
+	return optstring;
+}
+int _getopt_internal_r_a (int argc, char *const *argv, const char *optstring, const struct option_a *longopts, int *longind, int long_only, struct _getopt_data_a *d, int posixly_correct)
+{
+	int print_errors = d->opterr;
+	if (argc < 1)
+		return -1;
+	d->optarg = NULL;
+	if (d->optind == 0 || !d->__initialized)
+	{
+		if (d->optind == 0)
+			d->optind = 1;
+		optstring = _getopt_initialize_a (optstring, d, posixly_correct);
+		d->__initialized = 1;
+	}
+	else if (optstring[0] == '-' || optstring[0] == '+')
+		optstring++;
+	if (optstring[0] == ':')
+		print_errors = 0;
+	if (d->__nextchar == NULL || *d->__nextchar == '\0')
+	{
+		if (d->__last_nonopt > d->optind)
+			d->__last_nonopt = d->optind;
+		if (d->__first_nonopt > d->optind)
+			d->__first_nonopt = d->optind;
+		if (d->__ordering == PERMUTE)
+		{
+			if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
+				exchange_a ((char **) argv, d);
+			else if (d->__last_nonopt != d->optind)
+				d->__first_nonopt = d->optind;
+			while (d->optind < argc && (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0'))
+				d->optind++;
+			d->__last_nonopt = d->optind;
+		}
+		if (d->optind != argc && !strcmp(argv[d->optind], "--"))
+		{
+			d->optind++;
+			if (d->__first_nonopt != d->__last_nonopt && d->__last_nonopt != d->optind)
+				exchange_a((char **) argv, d);
+			else if (d->__first_nonopt == d->__last_nonopt)
+				d->__first_nonopt = d->optind;
+			d->__last_nonopt = argc;
+			d->optind = argc;
+		}
+		if (d->optind == argc)
+		{
+			if (d->__first_nonopt != d->__last_nonopt)
+				d->optind = d->__first_nonopt;
+			return -1;
+		}
+		if ((argv[d->optind][0] != '-' || argv[d->optind][1] == '\0'))
+		{
+			if (d->__ordering == REQUIRE_ORDER)
+				return -1;
+			d->optarg = argv[d->optind++];
+			return 1;
+		}
+		d->__nextchar = (argv[d->optind] + 1 + (longopts != NULL && argv[d->optind][1] == '-'));
+	}
+	if (longopts != NULL && (argv[d->optind][1] == '-' || (long_only && (argv[d->optind][2] || !strchr(optstring, argv[d->optind][1])))))
+	{
+		char *nameend;
+		unsigned int namelen;
+		const struct option_a *p;
+		const struct option_a *pfound = NULL;
+		struct option_list
+		{
+			const struct option_a *p;
+			struct option_list *next;
+		} *ambig_list = NULL;
+		int exact = 0;
+		int indfound = -1;
+		int option_index;
+		for (nameend = d->__nextchar; *nameend && *nameend != '='; nameend++);
+		namelen = (unsigned int)(nameend - d->__nextchar);
+		for (p = longopts, option_index = 0; p->name; p++, option_index++)
+			if (!strncmp(p->name, d->__nextchar, namelen))
+			{
+				if (namelen == (unsigned int)strlen(p->name))
+				{
+					pfound = p;
+					indfound = option_index;
+					exact = 1;
+					break;
+				}
+				else if (pfound == NULL)
+				{
+					pfound = p;
+					indfound = option_index;
+				}
+				else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
+				{
+					struct option_list *newp = (struct option_list*)alloca(sizeof(*newp));
+					newp->p = p;
+					newp->next = ambig_list;
+					ambig_list = newp;
+				}
+			}
+			if (ambig_list != NULL && !exact)
+			{
+				if (print_errors)
+				{
+					struct option_list first;
+					first.p = pfound;
+					first.next = ambig_list;
+					ambig_list = &first;
+					fprintf (stderr, "%s: option '%s' is ambiguous; possibilities:", argv[0], argv[d->optind]);
+					do
+					{
+						fprintf (stderr, " '--%s'", ambig_list->p->name);
+						ambig_list = ambig_list->next;
+					}
+					while (ambig_list != NULL);
+					fputc ('\n', stderr);
+				}
+				d->__nextchar += strlen(d->__nextchar);
+				d->optind++;
+				d->optopt = 0;
+				return '?';
+			}
+			if (pfound != NULL)
+			{
+				option_index = indfound;
+				d->optind++;
+				if (*nameend)
+				{
+					if (pfound->has_arg)
+						d->optarg = nameend + 1;
+					else
+					{
+						if (print_errors)
+						{
+							if (argv[d->optind - 1][1] == '-')
+							{
+								fprintf(stderr, "%s: option '--%s' doesn't allow an argument\n",argv[0], pfound->name);
+							}
+							else
+							{
+								fprintf(stderr, "%s: option '%c%s' doesn't allow an argument\n",argv[0], argv[d->optind - 1][0],pfound->name);
+							}
+						}
+						d->__nextchar += strlen(d->__nextchar);
+						d->optopt = pfound->val;
+						return '?';
+					}
+				}
+				else if (pfound->has_arg == 1)
+				{
+					if (d->optind < argc)
+						d->optarg = argv[d->optind++];
+					else
+					{
+						if (print_errors)
+						{
+							fprintf(stderr,"%s: option '--%s' requires an argument\n",argv[0], pfound->name);
+						}
+						d->__nextchar += strlen(d->__nextchar);
+						d->optopt = pfound->val;
+						return optstring[0] == ':' ? ':' : '?';
+					}
+				}
+				d->__nextchar += strlen(d->__nextchar);
+				if (longind != NULL)
+					*longind = option_index;
+				if (pfound->flag)
+				{
+					*(pfound->flag) = pfound->val;
+					return 0;
+				}
+				return pfound->val;
+			}
+			if (!long_only || argv[d->optind][1] == '-' || strchr(optstring, *d->__nextchar) == NULL)
+			{
+				if (print_errors)
+				{
+					if (argv[d->optind][1] == '-')
+					{
+						fprintf(stderr, "%s: unrecognized option '--%s'\n",argv[0], d->__nextchar);
+					}
+					else
+					{
+						fprintf(stderr, "%s: unrecognized option '%c%s'\n",argv[0], argv[d->optind][0], d->__nextchar);
+					}
+				}
+				d->__nextchar = (char *)"";
+				d->optind++;
+				d->optopt = 0;
+				return '?';
+			}
+	}
+	{
+		char c = *d->__nextchar++;
+		char *temp = (char*)strchr(optstring, c);
+		if (*d->__nextchar == '\0')
+			++d->optind;
+		if (temp == NULL || c == ':' || c == ';')
+		{
+			if (print_errors)
+			{
+				fprintf(stderr, "%s: invalid option -- '%c'\n", argv[0], c);
+			}
+			d->optopt = c;
+			return '?';
+		}
+		if (temp[0] == 'W' && temp[1] == ';')
+		{
+			char *nameend;
+			const struct option_a *p;
+			const struct option_a *pfound = NULL;
+			int exact = 0;
+			int ambig = 0;
+			int indfound = 0;
+			int option_index;
+			if (longopts == NULL)
+				goto no_longs;
+			if (*d->__nextchar != '\0')
+			{
+				d->optarg = d->__nextchar;
+				d->optind++;
+			}
+			else if (d->optind == argc)
+			{
+				if (print_errors)
+				{
+					fprintf(stderr,"%s: option requires an argument -- '%c'\n",argv[0], c);
+				}
+				d->optopt = c;
+				if (optstring[0] == ':')
+					c = ':';
+				else
+					c = '?';
+				return c;
+			}
+			else
+				d->optarg = argv[d->optind++];
+			for (d->__nextchar = nameend = d->optarg; *nameend && *nameend != '='; nameend++);
+			for (p = longopts, option_index = 0; p->name; p++, option_index++)
+				if (!strncmp(p->name, d->__nextchar, nameend - d->__nextchar))
+				{
+					if ((unsigned int) (nameend - d->__nextchar) == strlen(p->name))
+					{
+						pfound = p;
+						indfound = option_index;
+						exact = 1;
+						break;
+					}
+					else if (pfound == NULL)
+					{
+						pfound = p;
+						indfound = option_index;
+					}
+					else if (long_only || pfound->has_arg != p->has_arg || pfound->flag != p->flag || pfound->val != p->val)
+						ambig = 1;
+				}
+				if (ambig && !exact)
+				{
+					if (print_errors)
+					{
+						fprintf(stderr, "%s: option '-W %s' is ambiguous\n",argv[0], d->optarg);
+					}
+					d->__nextchar += strlen(d->__nextchar);
+					d->optind++;
+					return '?';
+				}
+				if (pfound != NULL)
+				{
+					option_index = indfound;
+					if (*nameend)
+					{
+						if (pfound->has_arg)
+							d->optarg = nameend + 1;
+						else
+						{
+							if (print_errors)
+							{
+								fprintf(stderr, "%s: option '-W %s' doesn't allow an argument\n",argv[0], pfound->name);
+							}
+							d->__nextchar += strlen(d->__nextchar);
+							return '?';
+						}
+					}
+					else if (pfound->has_arg == 1)
+					{
+						if (d->optind < argc)
+							d->optarg = argv[d->optind++];
+						else
+						{
+							if (print_errors)
+							{
+								fprintf(stderr, "%s: option '-W %s' requires an argument\n",argv[0], pfound->name);
+							}
+							d->__nextchar += strlen(d->__nextchar);
+							return optstring[0] == ':' ? ':' : '?';
+						}
+					}
+					else
+						d->optarg = NULL;
+					d->__nextchar += strlen(d->__nextchar);
+					if (longind != NULL)
+						*longind = option_index;
+					if (pfound->flag)
+					{
+						*(pfound->flag) = pfound->val;
+						return 0;
+					}
+					return pfound->val;
+				}
+no_longs:
+				d->__nextchar = NULL;
+				return 'W';
+		}
+		if (temp[1] == ':')
+		{
+			if (temp[2] == ':')
+			{
+				if (*d->__nextchar != '\0')
+				{
+					d->optarg = d->__nextchar;
+					d->optind++;
+				}
+				else
+					d->optarg = NULL;
+				d->__nextchar = NULL;
+			}
+			else
+			{
+				if (*d->__nextchar != '\0')
+				{
+					d->optarg = d->__nextchar;
+					d->optind++;
+				}
+				else if (d->optind == argc)
+				{
+					if (print_errors)
+					{
+						fprintf(stderr,"%s: option requires an argument -- '%c'\n",argv[0], c);
+					}
+					d->optopt = c;
+					if (optstring[0] == ':')
+						c = ':';
+					else
+						c = '?';
+				}
+				else
+					d->optarg = argv[d->optind++];
+				d->__nextchar = NULL;
+			}
+		}
+		return c;
+	}
+}
+int _getopt_internal_a (int argc, char *const *argv, const char *optstring, const struct option_a *longopts, int *longind, int long_only, int posixly_correct)
+{
+	int result;
+	getopt_data_a.optind = optind;
+	getopt_data_a.opterr = opterr;
+	result = _getopt_internal_r_a (argc, argv, optstring, longopts,longind, long_only, &getopt_data_a,posixly_correct);
+	optind = getopt_data_a.optind;
+	optarg_a = getopt_data_a.optarg;
+	optopt = getopt_data_a.optopt;
+	return result;
+}
+int getopt_a (int argc, char *const *argv, const char *optstring) _GETOPT_THROW
+{
+	return _getopt_internal_a (argc, argv, optstring, (const struct option_a *) 0, (int *) 0, 0, 0);
+}
+int getopt_long_a (int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW
+{
+	return _getopt_internal_a (argc, argv, options, long_options, opt_index, 0, 0);
+}
+int getopt_long_only_a (int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW
+{
+	return _getopt_internal_a (argc, argv, options, long_options, opt_index, 1, 0);
+}
+int _getopt_long_r_a (int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index, struct _getopt_data_a *d)
+{
+	return _getopt_internal_r_a (argc, argv, options, long_options, opt_index,0, d, 0);
+}
+int _getopt_long_only_r_a (int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index, struct _getopt_data_a *d)
+{
+	return _getopt_internal_r_a (argc, argv, options, long_options, opt_index, 1, d, 0);
+}
+

examples/client/getopt.h

@@ -0,0 +1,115 @@
+/* Getopt for Microsoft C
+This code is a modification of the Free Software Foundation, Inc.
+Getopt library for parsing command line argument the purpose was
+to provide a Microsoft Visual C friendly derivative. This code
+provides functionality for both Unicode and Multibyte builds.
+
+Date: 02/03/2011 - Ludvik Jerabek - Initial Release
+Version: 1.0
+Comment: Supports getopt, getopt_long, and getopt_long_only
+and POSIXLY_CORRECT environment flag
+License: LGPL
+
+Revisions:
+
+02/03/2011 - Ludvik Jerabek - Initial Release
+02/20/2011 - Ludvik Jerabek - Fixed compiler warnings at Level 4
+07/05/2011 - Ludvik Jerabek - Added no_argument, required_argument, optional_argument defs
+08/03/2011 - Ludvik Jerabek - Fixed non-argument runtime bug which caused runtime exception
+08/09/2011 - Ludvik Jerabek - Added code to export functions for DLL and LIB
+02/15/2012 - Ludvik Jerabek - Fixed _GETOPT_THROW definition missing in implementation file
+08/01/2012 - Ludvik Jerabek - Created separate functions for char and wchar_t characters so single dll can do both unicode and ansi
+10/15/2012 - Ludvik Jerabek - Modified to match latest GNU features
+06/19/2015 - Ludvik Jerabek - Fixed maximum option limitation caused by option_a (255) and option_w (65535) structure val variable
+24/10/2020 - Paul-Louis Ageneau - Removed Unicode version
+
+**DISCLAIMER**
+THIS MATERIAL IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+EITHER EXPRESS OR IMPLIED, INCLUDING, BUT Not LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE, OR NON-INFRINGEMENT. SOME JURISDICTIONS DO NOT ALLOW THE
+EXCLUSION OF IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT
+APPLY TO YOU. IN NO EVENT WILL I BE LIABLE TO ANY PARTY FOR ANY
+DIRECT, INDIRECT, SPECIAL OR OTHER CONSEQUENTIAL DAMAGES FOR ANY
+USE OF THIS MATERIAL INCLUDING, WITHOUT LIMITATION, ANY LOST
+PROFITS, BUSINESS INTERRUPTION, LOSS OF PROGRAMS OR OTHER DATA ON
+YOUR INFORMATION HANDLING SYSTEM OR OTHERWISE, EVEN If WE ARE
+EXPRESSLY ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+*/
+#ifndef __GETOPT_H_
+	#define __GETOPT_H_
+
+	#ifdef _GETOPT_API
+		#undef _GETOPT_API
+	#endif
+
+	#if defined(EXPORTS_GETOPT) && defined(STATIC_GETOPT)
+		#error "The preprocessor definitions of EXPORTS_GETOPT and STATIC_GETOPT can only be used individually"
+	#elif defined(STATIC_GETOPT)
+		#pragma message("Warning static builds of getopt violate the Lesser GNU Public License")
+		#define _GETOPT_API
+	#elif defined(EXPORTS_GETOPT)
+		#pragma message("Exporting getopt library")
+		#define _GETOPT_API __declspec(dllexport)
+	#else
+		#pragma message("Importing getopt library")
+		#define _GETOPT_API __declspec(dllimport)
+	#endif
+
+	// Change behavior for C\C++
+	#ifdef __cplusplus
+		#define _BEGIN_EXTERN_C extern "C" {
+		#define _END_EXTERN_C }
+		#define _GETOPT_THROW throw()
+	#else
+		#define _BEGIN_EXTERN_C
+		#define _END_EXTERN_C
+		#define _GETOPT_THROW
+	#endif
+
+	// Standard GNU options
+	#define	null_argument		0	/*Argument Null*/
+	#define	no_argument			0	/*Argument Switch Only*/
+	#define required_argument	1	/*Argument Required*/
+	#define optional_argument	2	/*Argument Optional*/	
+
+	// Shorter Options
+	#define ARG_NULL	0	/*Argument Null*/
+	#define ARG_NONE	0	/*Argument Switch Only*/
+	#define ARG_REQ		1	/*Argument Required*/
+	#define ARG_OPT		2	/*Argument Optional*/
+
+	#include <string.h>
+
+_BEGIN_EXTERN_C
+
+	extern _GETOPT_API int optind;
+	extern _GETOPT_API int opterr;
+	extern _GETOPT_API int optopt;
+
+	struct option_a
+	{
+		const char* name;
+		int has_arg;
+		int *flag;
+		int val;
+	};
+	extern _GETOPT_API char *optarg_a;
+	extern _GETOPT_API int getopt_a(int argc, char *const *argv, const char *optstring) _GETOPT_THROW;
+	extern _GETOPT_API int getopt_long_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW;
+	extern _GETOPT_API int getopt_long_only_a(int argc, char *const *argv, const char *options, const struct option_a *long_options, int *opt_index) _GETOPT_THROW;
+
+_END_EXTERN_C
+
+	#undef _BEGIN_EXTERN_C
+	#undef _END_EXTERN_C
+	#undef _GETOPT_THROW
+	#undef _GETOPT_API
+
+	#define getopt getopt_a
+	#define getopt_long getopt_long_a
+	#define getopt_long_only getopt_long_only_a
+	#define option option_a
+	#define optarg optarg_a
+
+#endif  // __GETOPT_H_

examples/client/main.cpp

@@ -0,0 +1,253 @@
+/*
+ * libdatachannel client example
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
+ * Copyright (c) 2019 Murat Dogan
+ * Copyright (c) 2020 Will Munn
+ * Copyright (c) 2020 Nico Chatzi
+ * Copyright (c) 2020 Lara Mackey
+ * Copyright (c) 2020 Erik Cota-Robles
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "rtc/rtc.hpp"
+
+#include "parse_cl.h"
+
+#include <nlohmann/json.hpp>
+
+#include <algorithm>
+#include <future>
+#include <iostream>
+#include <memory>
+#include <random>
+#include <stdexcept>
+#include <thread>
+#include <unordered_map>
+
+using namespace rtc;
+using namespace std;
+using namespace std::chrono_literals;
+
+using json = nlohmann::json;
+
+template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
+
+unordered_map<string, shared_ptr<PeerConnection>> peerConnectionMap;
+unordered_map<string, shared_ptr<DataChannel>> dataChannelMap;
+
+string localId;
+
+shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
+                                                weak_ptr<WebSocket> wws, string id);
+string randomId(size_t length);
+
+int main(int argc, char **argv) try {
+	auto params = std::make_unique<Cmdline>(argc, argv);
+
+	rtc::InitLogger(LogLevel::Info);
+
+	Configuration config;
+	string stunServer = "";
+	if (params->noStun()) {
+		cout << "No STUN server is configured. Only local hosts and public IP addresses supported."
+		     << endl;
+	} else {
+		if (params->stunServer().substr(0, 5).compare("stun:") != 0) {
+			stunServer = "stun:";
+		}
+		stunServer += params->stunServer() + ":" + to_string(params->stunPort());
+		cout << "Stun server is " << stunServer << endl;
+		config.iceServers.emplace_back(stunServer);
+	}
+
+	localId = randomId(4);
+	cout << "The local ID is: " << localId << endl;
+
+	auto ws = make_shared<WebSocket>();
+
+	std::promise<void> wsPromise;
+	auto wsFuture = wsPromise.get_future();
+
+	ws->onOpen([&wsPromise]() {
+		cout << "WebSocket connected, signaling ready" << endl;
+		wsPromise.set_value();
+	});
+
+	ws->onError([&wsPromise](string s) {
+		cout << "WebSocket error" << endl;
+		wsPromise.set_exception(std::make_exception_ptr(std::runtime_error(s)));
+	});
+
+	ws->onClosed([]() { cout << "WebSocket closed" << endl; });
+
+	ws->onMessage([&](variant<binary, string> data) {
+		if (!holds_alternative<string>(data))
+			return;
+
+		json message = json::parse(get<string>(data));
+
+		auto it = message.find("id");
+		if (it == message.end())
+			return;
+		string id = it->get<string>();
+
+		it = message.find("type");
+		if (it == message.end())
+			return;
+		string type = it->get<string>();
+
+		shared_ptr<PeerConnection> pc;
+		if (auto jt = peerConnectionMap.find(id); jt != peerConnectionMap.end()) {
+			pc = jt->second;
+		} else if (type == "offer") {
+			cout << "Answering to " + id << endl;
+			pc = createPeerConnection(config, ws, id);
+		} else {
+			return;
+		}
+
+		if (type == "offer" || type == "answer") {
+			auto sdp = message["description"].get<string>();
+			pc->setRemoteDescription(Description(sdp, type));
+		} else if (type == "candidate") {
+			auto sdp = message["candidate"].get<string>();
+			auto mid = message["mid"].get<string>();
+			pc->addRemoteCandidate(Candidate(sdp, mid));
+		}
+	});
+
+	string wsPrefix = "";
+	if (params->webSocketServer().substr(0, 5).compare("ws://") != 0) {
+		wsPrefix = "ws://";
+	}
+	const string url = wsPrefix + params->webSocketServer() + ":" +
+	                   to_string(params->webSocketPort()) + "/" + localId;
+	cout << "Url is " << url << endl;
+	ws->open(url);
+
+	cout << "Waiting for signaling to be connected..." << endl;
+	wsFuture.get();
+
+	while (true) {
+		string id;
+		cout << "Enter a remote ID to send an offer:" << endl;
+		cin >> id;
+		cin.ignore();
+		if (id.empty())
+			break;
+		if (id == localId)
+			continue;
+
+		cout << "Offering to " + id << endl;
+		auto pc = createPeerConnection(config, ws, id);
+
+		// We are the offerer, so create a data channel to initiate the process
+		const string label = "test";
+		cout << "Creating DataChannel with label \"" << label << "\"" << endl;
+		auto dc = pc->createDataChannel(label);
+
+		dc->onOpen([id, wdc = make_weak_ptr(dc)]() {
+			cout << "DataChannel from " << id << " open" << endl;
+			if (auto dc = wdc.lock())
+				dc->send("Hello from " + localId);
+		});
+
+		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
+
+		dc->onMessage([id, wdc = make_weak_ptr(dc)](variant<binary, string> data) {
+			if (holds_alternative<string>(data))
+				cout << "Message from " << id << " received: " << get<string>(data) << endl;
+			else
+				cout << "Binary message from " << id
+				     << " received, size=" << get<binary>(data).size() << endl;
+		});
+
+		dataChannelMap.emplace(id, dc);
+	}
+
+	cout << "Cleaning up..." << endl;
+
+	dataChannelMap.clear();
+	peerConnectionMap.clear();
+	return 0;
+
+} catch (const std::exception &e) {
+	std::cout << "Error: " << e.what() << std::endl;
+	dataChannelMap.clear();
+	peerConnectionMap.clear();
+	return -1;
+}
+
+// Create and setup a PeerConnection
+shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
+                                                weak_ptr<WebSocket> wws, string id) {
+	auto pc = make_shared<PeerConnection>(config);
+
+	pc->onStateChange([](PeerConnection::State state) { cout << "State: " << state << endl; });
+
+	pc->onGatheringStateChange(
+	    [](PeerConnection::GatheringState state) { cout << "Gathering State: " << state << endl; });
+
+	pc->onLocalDescription([wws, id](Description description) {
+		json message = {
+		    {"id", id}, {"type", description.typeString()}, {"description", string(description)}};
+
+		if (auto ws = wws.lock())
+			ws->send(message.dump());
+	});
+
+	pc->onLocalCandidate([wws, id](Candidate candidate) {
+		json message = {{"id", id},
+		                {"type", "candidate"},
+		                {"candidate", string(candidate)},
+		                {"mid", candidate.mid()}};
+
+		if (auto ws = wws.lock())
+			ws->send(message.dump());
+	});
+
+	pc->onDataChannel([id](shared_ptr<DataChannel> dc) {
+		cout << "DataChannel from " << id << " received with label \"" << dc->label() << "\""
+		     << endl;
+
+		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
+
+		dc->onMessage([id, wdc = make_weak_ptr(dc)](variant<binary, string> data) {
+			if (holds_alternative<string>(data))
+				cout << "Message from " << id << " received: " << get<string>(data) << endl;
+			else
+				cout << "Binary message from " << id
+				     << " received, size=" << get<binary>(data).size() << endl;
+		});
+
+		dc->send("Hello from " + localId);
+
+		dataChannelMap.emplace(id, dc);
+	});
+
+	peerConnectionMap.emplace(id, pc);
+	return pc;
+};
+
+// Helper function to generate a random ID
+string randomId(size_t length) {
+	static const string characters(
+	    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
+	string id(length, '0');
+	default_random_engine rng(random_device{}());
+	uniform_int_distribution<int> dist(0, int(characters.size() - 1));
+	generate(id.begin(), id.end(), [&]() { return characters.at(dist(rng)); });
+	return id;
+}

examples/client/parse_cl.cpp

@@ -0,0 +1,160 @@
+/******************************************************************************
+**
+** parse_cl.cpp
+**
+** Thu Aug  6 19:42:25 2020
+** Linux 5.4.0-42-generic (#46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020) x86_64
+** cerik@Erik-VBox-Ubuntu (Erik Cota-Robles)
+**
+** Copyright (c) 2020 Erik Cota-Robles
+**
+** Definition of command line parser class
+**
+** Automatically created by genparse v0.9.3
+**
+** See http://genparse.sourceforge.net for details and updates
+**
+**
+******************************************************************************/
+
+#include <stdlib.h>
+
+#if defined(_WIN32) || defined(WIN32)
+#include "getopt.h"
+#else
+#include <getopt.h>
+#endif
+
+#include "parse_cl.h"
+
+/*----------------------------------------------------------------------------
+**
+** Cmdline::Cmdline ()
+**
+** Constructor method.
+**
+**--------------------------------------------------------------------------*/
+
+Cmdline::Cmdline (int argc, char *argv[]) // ISO C++17 not allowed: throw (std::string )
+{
+  extern char *optarg;
+  extern int optind;
+  int c;
+
+  static struct option long_options[] =
+  {
+    {"noStun", no_argument, NULL, 'n'},
+    {"stunServer", required_argument, NULL, 's'},
+    {"stunPort", required_argument, NULL, 't'},
+    {"webSocketServer", required_argument, NULL, 'w'},
+    {"webSocketPort", required_argument, NULL, 'x'},
+    {"help", no_argument, NULL, 'h'},
+    {NULL, 0, NULL, 0}
+  };
+
+  _program_name += argv[0];
+
+  /* default values */
+  _n = false;
+  _s = "stun.l.google.com";
+  _t = 19302;
+  _w = "localhost";
+  _x = 8000;
+  _h = false;
+
+  optind = 0;
+  while ((c = getopt_long (argc, argv, "s:t:w:x:enhv", long_options, &optind)) != - 1)
+    {
+      switch (c)
+        {
+        case 'n':
+          _n = true;
+          break;
+
+        case 's':
+          _s = optarg;
+          break;
+
+        case 't':
+          _t = atoi (optarg);
+          if (_t < 0)
+            {
+              std::string err;
+              err += "parameter range error: t must be >= 0";
+              throw (std::range_error(err));
+            }
+          if (_t > 65535)
+            {
+              std::string err;
+              err += "parameter range error: t must be <= 65535";
+              throw (std::range_error(err));
+            }
+          break;
+
+        case 'w':
+          _w = optarg;
+          break;
+
+        case 'x':
+          _x = atoi (optarg);
+          if (_x < 0)
+            {
+              std::string err;
+              err += "parameter range error: x must be >= 0";
+              throw (std::range_error(err));
+            }
+          if (_x > 65535)
+            {
+              std::string err;
+              err += "parameter range error: x must be <= 65535";
+              throw (std::range_error(err));
+            }
+          break;
+
+        case 'h':
+          _h = true;
+          this->usage (EXIT_SUCCESS);
+          break;
+
+        default:
+          this->usage (EXIT_FAILURE);
+
+        }
+    } /* while */
+
+  _optind = optind;
+}
+
+/*----------------------------------------------------------------------------
+**
+** Cmdline::usage () and version()
+**
+** Print out usage (or version) information, then exit.
+**
+**--------------------------------------------------------------------------*/
+
+void Cmdline::usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    std::cerr << "Try `" << _program_name << " --help' for more information.\n";
+  else
+    {
+      std::cout << "\
+usage: " << _program_name << " [ -enstwxhv ] \n\
+libdatachannel client implementing WebRTC Data Channels with WebSocket signaling\n\
+   [ -n ] [ --noStun ] (type=FLAG)\n\
+          Do NOT use a stun server (overrides -s and -t).\n\
+   [ -s ] [ --stunServer ] (type=STRING, default=stun.l.google.com)\n\
+          Stun server URL or IP address.\n\
+   [ -t ] [ --stunPort ] (type=INTEGER, range=0...65535, default=19302)\n\
+          Stun server port.\n\
+   [ -w ] [ --webSocketServer ] (type=STRING, default=localhost)\n\
+          Web socket server URL or IP address.\n\
+   [ -x ] [ --webSocketPort ] (type=INTEGER, range=0...65535, default=8000)\n\
+          Web socket server port.\n\
+   [ -h ] [ --help ] (type=FLAG)\n\
+          Display this help and exit.\n";
+    }
+  exit (status);
+}
+

examples/client/parse_cl.h

@@ -0,0 +1,67 @@
+/******************************************************************************
+**
+** parse_cl.h
+**
+** Thu Aug  6 19:42:25 2020
+** Linux 5.4.0-42-generic (#46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020) x86_64
+** cerik@Erik-VBox-Ubuntu (Erik Cota-Robles)
+**
+** Copyright (c) 2020 Erik Cota-Robles
+**
+** Header file for command line parser class
+**
+** Automatically created by genparse v0.9.3
+**
+** See http://genparse.sourceforge.net for details and updates
+**
+******************************************************************************/
+
+#ifndef CMDLINE_H
+#define CMDLINE_H
+
+#include <iostream>
+#include <string>
+
+/*----------------------------------------------------------------------------
+**
+** class Cmdline
+**
+** command line parser class
+**
+**--------------------------------------------------------------------------*/
+
+class Cmdline
+{
+private:
+  /* parameters */
+  bool _n;
+  std::string _s;
+  int _t;
+  std::string _w;
+  int _x;
+  bool _h;
+
+  /* other stuff to keep track of */
+  std::string _program_name;
+  int _optind;
+
+public:
+  /* constructor and destructor */
+  Cmdline (int, char **); // ISO C++17 not allowed: throw (std::string);
+  ~Cmdline (){}
+
+  /* usage function */
+  void usage (int status);
+
+  /* return next (non-option) parameter */
+  int next_param () { return _optind; }
+
+  bool noStun () const { return _n; }
+  std::string stunServer () const { return _s; }
+  int stunPort () const { return _t; }
+  std::string webSocketServer () const { return _w; }
+  int webSocketPort () const { return _x; }
+  bool h () const { return _h; }
+};
+
+#endif

examples/copy-paste-capi/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.5.1)
+project(offerer C)
+
+set(CMAKE_C_STANDARD 11)
+
+add_executable(datachannel-copy-paste-capi-offerer offerer.c)
+set_target_properties(datachannel-copy-paste-capi-offerer PROPERTIES
+	OUTPUT_NAME offerer)
+target_link_libraries(datachannel-copy-paste-capi-offerer datachannel)
+
+add_executable(datachannel-copy-paste-capi-answerer answerer.c)
+set_target_properties(datachannel-copy-paste-capi-answerer PROPERTIES
+	OUTPUT_NAME answerer)
+target_link_libraries(datachannel-copy-paste-capi-answerer datachannel)
+

examples/copy-paste-capi/answerer.c

@@ -0,0 +1,305 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ * Copyright (c) 2020 Stevedan Ogochukwu Omodolor
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <rtc/rtc.h>
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef _WIN32
+#include "getline.h"
+#include <windows.h>
+static void sleep(unsigned int secs) { Sleep(secs * 1000); }
+#else
+#include <unistd.h> // for sleep
+#endif
+
+typedef struct {
+	rtcState state;
+	rtcGatheringState gatheringState;
+	int pc;
+	int dc;
+	bool connected;
+} Peer;
+
+static void RTC_API dataChannelCallback(int pc, int dc, void *ptr);
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr);
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr);
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr);
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr);
+static void RTC_API closedCallback(int id, void *ptr);
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr);
+static void deletePeer(Peer *peer);
+
+char *state_print(rtcState state);
+char *rtcGatheringState_print(rtcGatheringState state);
+
+int all_space(const char *str);
+
+int main(int argc, char **argv) {
+	rtcInitLogger(RTC_LOG_DEBUG, NULL);
+
+	// Create peer
+	rtcConfiguration config;
+	memset(&config, 0, sizeof(config));
+
+	Peer *peer = (Peer *)malloc(sizeof(Peer));
+	if (!peer) {
+		fprintf(stderr, "Error allocating memory for peer\n");
+		return -1;
+	}
+	memset(peer, 0, sizeof(Peer));
+
+	printf("Peer created\n");
+
+	// Create peer connection
+	peer->pc = rtcCreatePeerConnection(&config);
+
+	rtcSetUserPointer(peer->pc, peer);
+	rtcSetLocalDescriptionCallback(peer->pc, descriptionCallback);
+	rtcSetLocalCandidateCallback(peer->pc, candidateCallback);
+	rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
+	rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
+
+	rtcSetUserPointer(peer->dc, NULL);
+	rtcSetDataChannelCallback(peer->pc, dataChannelCallback);
+
+	sleep(1);
+
+	bool exit = false;
+	while (!exit) {
+		printf("\n");
+		printf("***********************************************************************************"
+		       "****\n");
+		printf("* 0: Exit /"
+		       " 1: Enter remote description /"
+		       " 2: Enter remote candidate /"
+		       " 3: Send message /"
+		       " 4: Print Connection Info *\n"
+		       "[Command]: ");
+
+		int command = -1;
+		int c;
+
+		if (!scanf("%d", &command)) {
+			break;
+		}
+
+		while ((c = getchar()) != '\n' && c != EOF) {
+		}
+		fflush(stdin);
+
+		switch (command) {
+		case 0: {
+			exit = true;
+			break;
+		}
+		case 1: {
+			// Parse Description
+			printf("[Description]: ");
+			char *line = NULL;
+			size_t len = 0;
+			size_t read = 0;
+			char *sdp = (char *)malloc(sizeof(char));
+			while ((read = getline(&line, &len, stdin)) != -1 && !all_space(line)) {
+				sdp = (char *)realloc(sdp, (strlen(sdp) + 1) + strlen(line) + 1);
+				strcat(sdp, line);
+			}
+			printf("%s\n", sdp);
+			rtcSetRemoteDescription(peer->pc, sdp, "offer");
+			free(sdp);
+			free(line);
+			break;
+		}
+		case 2: {
+			// Parse Candidate
+			printf("[Candidate]: ");
+			char *candidate = NULL;
+			size_t candidate_size = 0;
+
+			if (getline(&candidate, &candidate_size, stdin)) {
+				rtcAddRemoteCandidate(peer->pc, candidate, NULL);
+				free(candidate);
+
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
+
+			break;
+		}
+		case 3: {
+			// Send Message
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			printf("[Message]: ");
+			char *message = NULL;
+			size_t message_size = 0;
+
+			if (getline(&message, &message_size, stdin)) {
+				rtcSendMessage(peer->dc, message, -1);
+				free(message);
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
+			break;
+		}
+		case 4: {
+			// Connection Info
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			char buffer[256];
+			if (rtcGetLocalAddress(peer->pc, buffer, 256) >= 0)
+				printf("Local address 1:  %s\n", buffer);
+			if (rtcGetRemoteAddress(peer->pc, buffer, 256) >= 0)
+				printf("Remote address 1: %s\n", buffer);
+
+			else
+				printf("Could not get Candidate Pair Info\n");
+			break;
+		}
+		default: {
+			printf("** Invalid Command **");
+			break;
+		}
+		}
+	}
+
+	deletePeer(peer);
+	return 0;
+}
+
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr) {
+	printf("Description %s:\n%s\n", "answerer", sdp);
+}
+
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
+	printf("Candidate %s: %s\n", "answerer", cand);
+}
+
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->state = state;
+	printf("State %s: %s\n", "answerer", state_print(state));
+}
+
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->gatheringState = state;
+	printf("Gathering state %s: %s\n", "answerer", rtcGatheringState_print(state));
+}
+
+static void RTC_API closedCallback(int id, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->connected = false;
+}
+
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr) {
+	if (size < 0) { // negative size indicates a null-terminated string
+		printf("Message %s: %s\n", "answerer", message);
+	} else {
+		printf("Message %s: [binary of size %d]\n", "answerer", size);
+	}
+}
+
+static void RTC_API dataChannelCallback(int pc, int dc, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->dc = dc;
+	peer->connected = true;
+	rtcSetClosedCallback(dc, closedCallback);
+	rtcSetMessageCallback(dc, messageCallback);
+	char buffer[256];
+	if (rtcGetDataChannelLabel(dc, buffer, 256) >= 0)
+		printf("DataChannel %s: Received with label \"%s\"\n", "answerer", buffer);
+}
+
+static void deletePeer(Peer *peer) {
+	if (peer) {
+		if (peer->dc)
+			rtcDeleteDataChannel(peer->dc);
+		if (peer->pc)
+			rtcDeletePeerConnection(peer->pc);
+		free(peer);
+	}
+}
+
+char *state_print(rtcState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_NEW:
+		str = "RTC_NEW";
+		break;
+	case RTC_CONNECTING:
+		str = "RTC_CONNECTING";
+		break;
+	case RTC_CONNECTED:
+		str = "RTC_CONNECTED";
+		break;
+	case RTC_DISCONNECTED:
+		str = "RTC_DISCONNECTED";
+		break;
+	case RTC_FAILED:
+		str = "RTC_FAILED";
+		break;
+	case RTC_CLOSED:
+		str = "RTC_CLOSED";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
+char *rtcGatheringState_print(rtcGatheringState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_GATHERING_NEW:
+		str = "RTC_GATHERING_NEW";
+		break;
+	case RTC_GATHERING_INPROGRESS:
+		str = "RTC_GATHERING_INPROGRESS";
+		break;
+	case RTC_GATHERING_COMPLETE:
+		str = "RTC_GATHERING_COMPLETE";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
+int all_space(const char *str) {
+	while (*str) {
+		if (!isspace(*str++)) {
+			return 0;
+		}
+	}
+
+	return 1;
+}

examples/copy-paste-capi/getline.h

@@ -0,0 +1,48 @@
+// Simple POSIX getline() implementation
+// This code is public domain
+
+#include <malloc.h>
+#include <stddef.h>
+#include <stdio.h>
+
+int getline(char **lineptr, size_t *n, FILE *stream) {
+	if (!lineptr || !stream || !n)
+		return -1;
+
+	int c = getc(stream);
+	if (c == EOF)
+		return -1;
+
+	if (!*lineptr) {
+		*lineptr = malloc(128);
+		if (!*lineptr)
+			return -1;
+
+		*n = 128;
+	}
+
+	int pos = 0;
+	while(c != EOF) {
+        if (pos + 1 >= *n) {
+            size_t new_size = *n + (*n >> 2);
+			if (new_size < 128)
+				new_size = 128;
+
+			char *new_ptr = realloc(*lineptr, new_size);
+			if (!new_ptr)
+				return -1;
+
+			*n = new_size;
+            *lineptr = new_ptr;
+        }
+
+        ((unsigned char *)(*lineptr))[pos ++] = c;
+		if (c == '\n')
+			break;
+
+		c = getc(stream);
+    }
+
+    (*lineptr)[pos] = '\0';
+    return pos;
+}

examples/copy-paste-capi/offerer.c

@@ -0,0 +1,305 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ * Copyright (c) 2020 Stevedan Ogochukwu Omodolor
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <rtc/rtc.h>
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef _WIN32
+#include "getline.h"
+#include <windows.h>
+static void sleep(unsigned int secs) { Sleep(secs * 1000); }
+#else
+#include <unistd.h> // for sleep
+#endif
+
+typedef struct {
+	rtcState state;
+	rtcGatheringState gatheringState;
+	int pc;
+	int dc;
+	bool connected;
+} Peer;
+
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr);
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr);
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr);
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr);
+static void RTC_API openCallback(int id, void *ptr);
+static void RTC_API closedCallback(int id, void *ptr);
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr);
+static void deletePeer(Peer *peer);
+
+char *state_print(rtcState state);
+char *rtcGatheringState_print(rtcGatheringState state);
+
+int all_space(const char *str);
+
+int main(int argc, char **argv) {
+	rtcInitLogger(RTC_LOG_DEBUG, NULL);
+
+	// Create peer
+	rtcConfiguration config;
+	memset(&config, 0, sizeof(config));
+
+	Peer *peer = (Peer *)malloc(sizeof(Peer));
+	if (!peer) {
+		fprintf(stderr, "Error allocating memory for peer\n");
+		return -1;
+	}
+	memset(peer, 0, sizeof(Peer));
+
+	printf("Peer created\n");
+
+	// Create peer connection
+	peer->pc = rtcCreatePeerConnection(&config);
+	rtcSetUserPointer(peer->pc, peer);
+	rtcSetLocalDescriptionCallback(peer->pc, descriptionCallback);
+	rtcSetLocalCandidateCallback(peer->pc, candidateCallback);
+	rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
+	rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
+
+	// Since we are the offerer, we will create a datachannel
+	peer->dc = rtcCreateDataChannel(peer->pc, "test");
+	rtcSetOpenCallback(peer->dc, openCallback);
+	rtcSetClosedCallback(peer->dc, closedCallback);
+	rtcSetMessageCallback(peer->dc, messageCallback);
+
+	sleep(1);
+
+	bool exit = false;
+	while (!exit) {
+
+		printf("\n");
+		printf("***********************************************************************************"
+		       "****\n");
+		printf("* 0: Exit /"
+		       " 1: Enter remote description /"
+		       " 2: Enter remote candidate /"
+		       " 3: Send message /"
+		       " 4: Print Connection Info *\n"
+		       "[Command]: ");
+
+		int command = -1;
+		int c;
+
+		if (!scanf("%d", &command)) {
+			break;
+		}
+
+		while ((c = getchar()) != '\n' && c != EOF) {
+		}
+		fflush(stdin);
+
+		switch (command) {
+		case 0: {
+			exit = true;
+			break;
+		}
+		case 1: {
+			// Parse Description
+			printf("[Description]: ");
+
+			char *line = NULL;
+			size_t len = 0;
+			size_t read = 0;
+			char *sdp = (char *)malloc(sizeof(char));
+			while ((read = getline(&line, &len, stdin)) != -1 && !all_space(line)) {
+				sdp = (char *)realloc(sdp, (strlen(sdp) + 1) + strlen(line) + 1);
+				strcat(sdp, line);
+			}
+			printf("%s\n", sdp);
+			rtcSetRemoteDescription(peer->pc, sdp, "answer");
+			free(sdp);
+			free(line);
+			break;
+		}
+		case 2: {
+			// Parse Candidate
+			printf("[Candidate]: ");
+			char *candidate = NULL;
+			size_t candidate_size = 0;
+			if (getline(&candidate, &candidate_size, stdin)) {
+				rtcAddRemoteCandidate(peer->pc, candidate, NULL);
+				free(candidate);
+
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
+
+			break;
+		}
+		case 3: {
+			// Send Message
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			printf("[Message]: ");
+			char *message = NULL;
+			size_t message_size = 0;
+			if (getline(&message, &message_size, stdin)) {
+				rtcSendMessage(peer->dc, message, -1);
+				free(message);
+			} else {
+				printf("Error reading line\n");
+				break;
+			}
+
+			break;
+		}
+		case 4: {
+			// Connection Info
+			if (!peer->connected) {
+				printf("** Channel is not Open **");
+				break;
+			}
+			char buffer[256];
+			if (rtcGetLocalAddress(peer->pc, buffer, 256) >= 0)
+				printf("Local address 1:  %s\n", buffer);
+			if (rtcGetRemoteAddress(peer->pc, buffer, 256) >= 0)
+				printf("Remote address 1: %s\n", buffer);
+
+			else
+				printf("Could not get Candidate Pair Info\n");
+			break;
+		}
+		default: {
+			printf("** Invalid Command **");
+			break;
+		}
+		}
+	}
+
+	deletePeer(peer);
+	return 0;
+}
+
+static void RTC_API descriptionCallback(int pc, const char *sdp, const char *type, void *ptr) {
+	printf("Description %s:\n%s\n", "offerer", sdp);
+}
+
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
+	printf("Candidate %s: %s\n", "offerer", cand);
+}
+
+static void RTC_API stateChangeCallback(int pc, rtcState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->state = state;
+	printf("State %s: %s\n", "offerer", state_print(state));
+}
+
+static void RTC_API gatheringStateCallback(int pc, rtcGatheringState state, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->gatheringState = state;
+	printf("Gathering state %s: %s\n", "offerer", rtcGatheringState_print(state));
+}
+
+static void RTC_API openCallback(int id, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->connected = true;
+	char buffer[256];
+	if (rtcGetDataChannelLabel(peer->dc, buffer, 256) >= 0)
+		printf("DataChannel %s: Received with label \"%s\"\n", "offerer", buffer);
+}
+
+static void RTC_API closedCallback(int id, void *ptr) {
+	Peer *peer = (Peer *)ptr;
+	peer->connected = false;
+}
+
+static void RTC_API messageCallback(int id, const char *message, int size, void *ptr) {
+	if (size < 0) { // negative size indicates a null-terminated string
+		printf("Message %s: %s\n", "offerer", message);
+	} else {
+		printf("Message %s: [binary of size %d]\n", "offerer", size);
+	}
+}
+
+static void deletePeer(Peer *peer) {
+	if (peer) {
+		if (peer->dc)
+			rtcDeleteDataChannel(peer->dc);
+		if (peer->pc)
+			rtcDeletePeerConnection(peer->pc);
+		free(peer);
+	}
+}
+
+char *state_print(rtcState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_NEW:
+		str = "RTC_NEW";
+		break;
+	case RTC_CONNECTING:
+		str = "RTC_CONNECTING";
+		break;
+	case RTC_CONNECTED:
+		str = "RTC_CONNECTED";
+		break;
+	case RTC_DISCONNECTED:
+		str = "RTC_DISCONNECTED";
+		break;
+	case RTC_FAILED:
+		str = "RTC_FAILED";
+		break;
+	case RTC_CLOSED:
+		str = "RTC_CLOSED";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
+char *rtcGatheringState_print(rtcGatheringState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_GATHERING_NEW:
+		str = "RTC_GATHERING_NEW";
+		break;
+	case RTC_GATHERING_INPROGRESS:
+		str = "RTC_GATHERING_INPROGRESS";
+		break;
+	case RTC_GATHERING_COMPLETE:
+		str = "RTC_GATHERING_COMPLETE";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
+int all_space(const char *str) {
+	while (*str) {
+		if (!isspace(*str++)) {
+			return 0;
+		}
+	}
+
+	return 1;
+}

examples/copy-paste/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.7)
+
+add_executable(datachannel-copy-paste-offerer offerer.cpp)
+set_target_properties(datachannel-copy-paste-offerer PROPERTIES
+	CXX_STANDARD 17
+	OUTPUT_NAME offerer)
+target_link_libraries(datachannel-copy-paste-offerer datachannel)
+
+add_executable(datachannel-copy-paste-answerer answerer.cpp)
+set_target_properties(datachannel-copy-paste-answerer PROPERTIES
+	CXX_STANDARD 17
+	OUTPUT_NAME answerer)
+target_link_libraries(datachannel-copy-paste-answerer datachannel)
+

examples/copy-paste/README.md

@@ -0,0 +1,9 @@
+* Execute ```offerer``` app in console
+* Execute ```answerer``` app in another console
+* Copy "Local Description" from ```offerer```
+* Enter 1 to ```answerer```
+* Paste copied description, press enter
+* Redo same procedure for ```answerer```
+* Redo same procedure for candidates
+* Wait for "DataChannel open" message
+* Send message from one peer to another

examples/copy-paste/answerer.cpp

@@ -0,0 +1,157 @@
+/**
+ * Copyright (c) 2019 Paul-Louis Ageneau, Murat Dogan
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "rtc/rtc.hpp"
+
+#include <chrono>
+#include <iostream>
+#include <memory>
+#include <thread>
+
+using namespace rtc;
+using namespace std;
+
+template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
+
+int main(int argc, char **argv) {
+	rtc::InitLogger(LogLevel::Warning);
+
+	Configuration config;
+	// config.iceServers.emplace_back("stun.l.google.com:19302");
+
+	auto pc = std::make_shared<PeerConnection>(config);
+
+	pc->onLocalDescription([](Description description) {
+		cout << "Local Description (Paste this to the other peer):" << endl;
+		cout << string(description) << endl;
+	});
+
+	pc->onLocalCandidate([](Candidate candidate) {
+		cout << "Local Candidate (Paste this to the other peer after the local description):"
+		     << endl;
+		cout << string(candidate) << endl << endl;
+	});
+
+	pc->onStateChange(
+	    [](PeerConnection::State state) { cout << "[State: " << state << "]" << endl; });
+	pc->onGatheringStateChange([](PeerConnection::GatheringState state) {
+		cout << "[Gathering State: " << state << "]" << endl;
+	});
+
+	shared_ptr<DataChannel> dc = nullptr;
+	pc->onDataChannel([&](shared_ptr<DataChannel> _dc) {
+		cout << "[Got a DataChannel with label: " << _dc->label() << "]" << endl;
+		dc = _dc;
+
+		dc->onClosed([&]() { cout << "[DataChannel closed: " << dc->label() << "]" << endl; });
+
+		dc->onMessage([](variant<binary, string> message) {
+			if (holds_alternative<string>(message)) {
+				cout << "[Received message: " << get<string>(message) << "]" << endl;
+			}
+		});
+	});
+
+	bool exit = false;
+	while (!exit) {
+		cout << endl
+		     << "**********************************************************************************"
+		        "*****"
+		     << endl
+		     << "* 0: Exit /"
+		     << " 1: Enter remote description /"
+		     << " 2: Enter remote candidate /"
+		     << " 3: Send message /"
+		     << " 4: Print Connection Info *" << endl
+		     << "[Command]: ";
+
+		int command = -1;
+		cin >> command;
+		cin.ignore();
+
+		switch (command) {
+		case 0: {
+			exit = true;
+			break;
+		}
+		case 1: {
+			// Parse Description
+			cout << "[Description]: ";
+			string sdp, line;
+			while (getline(cin, line) && !line.empty()) {
+				sdp += line;
+				sdp += "\r\n";
+			}
+			std::cout << sdp;
+			pc->setRemoteDescription(sdp);
+			break;
+		}
+		case 2: {
+			// Parse Candidate
+			cout << "[Candidate]: ";
+			string candidate;
+			getline(cin, candidate);
+			pc->addRemoteCandidate(candidate);
+			break;
+		}
+		case 3: {
+			// Send Message
+			if (!dc || !dc->isOpen()) {
+				cout << "** Channel is not Open ** ";
+				break;
+			}
+			cout << "[Message]: ";
+			string message;
+			getline(cin, message);
+			dc->send(message);
+			break;
+		}
+		case 4: {
+			// Connection Info
+			if (!dc || !dc->isOpen()) {
+				cout << "** Channel is not Open ** ";
+				break;
+			}
+			Candidate local, remote;
+			std::optional<std::chrono::milliseconds> rtt = pc->rtt();
+			if (pc->getSelectedCandidatePair(&local, &remote)) {
+				cout << "Local: " << local << endl;
+				cout << "Remote: " << remote << endl;
+				cout << "Bytes Sent:" << pc->bytesSent()
+				     << " / Bytes Received:" << pc->bytesReceived() << " / Round-Trip Time:";
+				if (rtt.has_value())
+					cout << rtt.value().count();
+				else
+					cout << "null";
+				cout << " ms";
+			} else
+				cout << "Could not get Candidate Pair Info" << endl;
+			break;
+		}
+		default: {
+			cout << "** Invalid Command ** ";
+			break;
+		}
+		}
+	}
+
+	if (dc)
+		dc->close();
+	if (pc)
+		pc->close();
+}

examples/copy-paste/offerer.cpp

@@ -0,0 +1,157 @@
+/**
+ * Copyright (c) 2019 Paul-Louis Ageneau, Murat Dogan
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "rtc/rtc.hpp"
+
+#include <chrono>
+#include <iostream>
+#include <memory>
+#include <thread>
+
+using namespace rtc;
+using namespace std;
+
+template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
+
+int main(int argc, char **argv) {
+	rtc::InitLogger(LogLevel::Warning);
+
+	Configuration config;
+	// config.iceServers.emplace_back("stun.l.google.com:19302");
+
+	auto pc = std::make_shared<PeerConnection>(config);
+
+	pc->onLocalDescription([](Description description) {
+		cout << "Local Description (Paste this to the other peer):" << endl;
+		cout << string(description) << endl;
+	});
+
+	pc->onLocalCandidate([](Candidate candidate) {
+		cout << "Local Candidate (Paste this to the other peer after the local description):"
+		     << endl;
+		cout << string(candidate) << endl << endl;
+	});
+
+	pc->onStateChange(
+	    [](PeerConnection::State state) { cout << "[State: " << state << "]" << endl; });
+
+	pc->onGatheringStateChange([](PeerConnection::GatheringState state) {
+		cout << "[Gathering State: " << state << "]" << endl;
+	});
+
+	auto dc = pc->createDataChannel("test"); // this is the offerer, so create a data channel
+
+	dc->onOpen([&]() { cout << "[DataChannel open: " << dc->label() << "]" << endl; });
+
+	dc->onClosed([&]() { cout << "[DataChannel closed: " << dc->label() << "]" << endl; });
+
+	dc->onMessage([](variant<binary, string> message) {
+		if (holds_alternative<string>(message)) {
+			cout << "[Received: " << get<string>(message) << "]" << endl;
+		}
+	});
+
+	this_thread::sleep_for(1s);
+
+	bool exit = false;
+	while (!exit) {
+		cout << endl
+		     << "**********************************************************************************"
+		        "*****"
+		     << endl
+		     << "* 0: Exit /"
+		     << " 1: Enter remote description /"
+		     << " 2: Enter remote candidate /"
+		     << " 3: Send message /"
+		     << " 4: Print Connection Info *" << endl
+		     << "[Command]: ";
+
+		int command = -1;
+		cin >> command;
+		cin.ignore();
+
+		switch (command) {
+		case 0: {
+			exit = true;
+			break;
+		}
+		case 1: {
+			// Parse Description
+			cout << "[Description]: ";
+			string sdp, line;
+			while (getline(cin, line) && !line.empty()) {
+				sdp += line;
+				sdp += "\r\n";
+			}
+			pc->setRemoteDescription(sdp);
+			break;
+		}
+		case 2: {
+			// Parse Candidate
+			cout << "[Candidate]: ";
+			string candidate;
+			getline(cin, candidate);
+			pc->addRemoteCandidate(candidate);
+			break;
+		}
+		case 3: {
+			// Send Message
+			if (!dc->isOpen()) {
+				cout << "** Channel is not Open ** ";
+				break;
+			}
+			cout << "[Message]: ";
+			string message;
+			getline(cin, message);
+			dc->send(message);
+			break;
+		}
+		case 4: {
+			// Connection Info
+			if (!dc || !dc->isOpen()) {
+				cout << "** Channel is not Open ** ";
+				break;
+			}
+			Candidate local, remote;
+			std::optional<std::chrono::milliseconds> rtt = pc->rtt();
+			if (pc->getSelectedCandidatePair(&local, &remote)) {
+				cout << "Local: " << local << endl;
+				cout << "Remote: " << remote << endl;
+				cout << "Bytes Sent:" << pc->bytesSent()
+				     << " / Bytes Received:" << pc->bytesReceived() << " / Round-Trip Time:";
+				if (rtt.has_value())
+					cout << rtt.value().count();
+				else
+					cout << "null";
+				cout << " ms";
+			} else
+				cout << "Could not get Candidate Pair Info" << endl;
+			break;
+		}
+		default: {
+			cout << "** Invalid Command ** ";
+			break;
+		}
+		}
+	}
+
+	if (dc)
+		dc->close();
+	if (pc)
+		pc->close();
+}

examples/media/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.7)
+
+add_executable(datachannel-media main.cpp)
+set_target_properties(datachannel-media PROPERTIES
+        CXX_STANDARD 17
+        OUTPUT_NAME media)
+target_link_libraries(datachannel-media datachannel nlohmann_json)
+

examples/media/README.md

@@ -0,0 +1,19 @@
+# Example Webcam from Browser to Port 5000
+This is an example copy/paste demo to send your webcam from your browser and out port 5000 through the demo application.
+
+## How to use
+Open main.html in your browser (you must open it either as HTTPS or as a domain of http://localhost).
+
+Start the application and copy it's offer into the text box of the web page.
+
+Copy the answer of the webpage back into the application.
+
+You will now see RTP traffic on `localhost:5000` of the computer that the application is running on.
+
+Use the following gstreamer demo pipeline to display the traffic
+(you might need to wave your hand in front of your camera to force an I-frame).
+
+```
+$ gst-launch-1.0 udpsrc address=127.0.0.1 port=5000 caps="application/x-rtp" ! queue ! rtph264depay ! video/x-h264,stream-format=byte-stream ! queue ! avdec_h264 ! queue ! autovideosink
+```
+

examples/media/main.cpp

@@ -0,0 +1,97 @@
+/*
+ * libdatachannel client example
+ * Copyright (c) 2020 Staz Modrzynski
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
+
+#include "rtc/rtc.hpp"
+
+#include <iostream>
+#include <memory>
+#include <utility>
+
+#include <nlohmann/json.hpp>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+typedef int SOCKET;
+#endif
+
+using nlohmann::json;
+
+int main() {
+	try {
+		rtc::InitLogger(rtc::LogLevel::Debug);
+		auto pc = std::make_shared<rtc::PeerConnection>();
+
+		pc->onStateChange(
+		    [](rtc::PeerConnection::State state) { std::cout << "State: " << state << std::endl; });
+
+		pc->onGatheringStateChange([pc](rtc::PeerConnection::GatheringState state) {
+			std::cout << "Gathering State: " << state << std::endl;
+			if (state == rtc::PeerConnection::GatheringState::Complete) {
+				auto description = pc->localDescription();
+				json message = {{"type", description->typeString()},
+				                {"sdp", std::string(description.value())}};
+				std::cout << message << std::endl;
+			}
+		});
+
+		SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
+		sockaddr_in addr;
+		addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+		addr.sin_port = htons(5000);
+		addr.sin_family = AF_INET;
+
+		rtc::Description::Video media("video", rtc::Description::Direction::RecvOnly);
+		media.addH264Codec(96);
+		media.setBitrate(
+		    3000); // Request 3Mbps (Browsers do not encode more than 2.5MBps from a webcam)
+
+		auto track = pc->addTrack(media);
+
+		auto session = std::make_shared<rtc::RtcpReceivingSession>();
+		track->setRtcpHandler(session);
+
+		track->onMessage(
+		    [session, sock, addr](rtc::binary message) {
+			    // This is an RTP packet
+			    sendto(sock, reinterpret_cast<const char *>(message.data()), int(message.size()), 0,
+			           reinterpret_cast<const struct sockaddr *>(&addr), sizeof(addr));
+		    },
+		    nullptr);
+
+		pc->setLocalDescription();
+
+		std::cout << "Expect RTP video traffic on localhost:5000" << std::endl;
+		std::cout << "Please copy/paste the answer provided by the browser: " << std::endl;
+		std::string sdp;
+		std::getline(std::cin, sdp);
+		std::cout << "Got answer" << sdp << std::endl;
+		json j = json::parse(sdp);
+		rtc::Description answer(j["sdp"].get<std::string>(), j["type"].get<std::string>());
+		pc->setRemoteDescription(answer);
+		std::cout << "Press any key to exit." << std::endl;
+		std::cin >> sdp;
+
+	} catch (const std::exception &e) {
+		std::cerr << "Error: " << e.what() << std::endl;
+	}
+}

examples/media/main.html

@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>libdatachannel media example</title>
+</head>
+<body>
+
+<p>Please enter the offer provided to you by the application: </p>
+<textarea cols="50" rows="50"></textarea>
+<button>Submit</button>
+
+<script>
+    document.querySelector('button').addEventListener('click',  async () => {
+        let offer = JSON.parse(document.querySelector('textarea').value);
+        rtc = new RTCPeerConnection({
+            // Recommended for libdatachannel
+            bundlePolicy: "max-bundle",
+        });
+
+        rtc.onicegatheringstatechange = (state) => {
+            if (rtc.iceGatheringState === 'complete') {
+                // We only want to provide an answer once all of our candidates have been added to the SDP.
+                let answer = rtc.localDescription;
+                document.querySelector('textarea').value = JSON.stringify({"type": answer.type, sdp: answer.sdp});
+                document.querySelector('p').value = 'Please paste the answer in the application.';
+                alert('Please paste the answer in the application.');
+            }
+        }
+        await rtc.setRemoteDescription(offer);
+
+        let media = await navigator.mediaDevices.getUserMedia({
+            video: {
+                width: 1280,
+                height: 720
+            }
+        });
+        media.getTracks().forEach(track => rtc.addTrack(track, media));
+        let answer = await rtc.createAnswer();
+        await rtc.setLocalDescription(answer);
+    })
+</script>
+
+</body>
+</html>

examples/sfu-media/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.7)
+
+add_executable(datachannel-sfu-media main.cpp)
+set_target_properties(datachannel-sfu-media PROPERTIES
+		CXX_STANDARD 17
+		OUTPUT_NAME sfu-media)
+target_link_libraries(datachannel-sfu-media datachannel nlohmann_json)
+

examples/sfu-media/main.cpp

@@ -0,0 +1,134 @@
+/*
+ * libdatachannel client example
+ * Copyright (c) 2020 Staz Modrzynski
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
+
+#include "rtc/rtc.hpp"
+
+#include <iostream>
+#include <memory>
+
+#include <nlohmann/json.hpp>
+
+using nlohmann::json;
+
+struct Receiver {
+	std::shared_ptr<rtc::PeerConnection> conn;
+	std::shared_ptr<rtc::Track> track;
+};
+int main() {
+	std::vector<std::shared_ptr<Receiver>> receivers;
+
+	try {
+		rtc::InitLogger(rtc::LogLevel::Info);
+
+		auto pc = std::make_shared<rtc::PeerConnection>();
+		pc->onStateChange(
+		    [](rtc::PeerConnection::State state) { std::cout << "State: " << state << std::endl; });
+		pc->onGatheringStateChange([pc](rtc::PeerConnection::GatheringState state) {
+			std::cout << "Gathering State: " << state << std::endl;
+			if (state == rtc::PeerConnection::GatheringState::Complete) {
+				auto description = pc->localDescription();
+				json message = {{"type", description->typeString()},
+				                {"sdp", std::string(description.value())}};
+				std::cout << "Please copy/paste this offer to the SENDER: " << message << std::endl;
+			}
+		});
+
+		rtc::Description::Video media("video", rtc::Description::Direction::RecvOnly);
+		media.addH264Codec(96);
+		media.setBitrate(
+		    3000); // Request 3Mbps (Browsers do not encode more than 2.5MBps from a webcam)
+
+		auto track = pc->addTrack(media);
+		pc->setLocalDescription();
+
+		auto session = std::make_shared<rtc::RtcpReceivingSession>();
+		track->setRtcpHandler(session);
+
+		const rtc::SSRC targetSSRC = 4;
+
+		track->onMessage(
+		    [&receivers, targetSSRC](rtc::binary message) {
+			    // This is an RTP packet
+			    auto rtp = (rtc::RTP *)message.data();
+			    rtp->setSsrc(targetSSRC);
+			    for (auto pc : receivers) {
+				    if (pc->track != nullptr && pc->track->isOpen()) {
+					    pc->track->send(message);
+				    }
+			    }
+		    },
+		    nullptr);
+
+		// Set the SENDERS Answer
+		{
+			std::cout << "Please copy/paste the answer provided by the SENDER: " << std::endl;
+			std::string sdp;
+			std::getline(std::cin, sdp);
+			std::cout << "Got answer" << sdp << std::endl;
+			json j = json::parse(sdp);
+			rtc::Description answer(j["sdp"].get<std::string>(), j["type"].get<std::string>());
+			pc->setRemoteDescription(answer);
+		}
+
+		// For each receiver
+		while (true) {
+			auto pc = std::make_shared<Receiver>();
+			pc->conn = std::make_shared<rtc::PeerConnection>();
+			pc->conn->onStateChange([](rtc::PeerConnection::State state) {
+				std::cout << "State: " << state << std::endl;
+			});
+			pc->conn->onGatheringStateChange([pc](rtc::PeerConnection::GatheringState state) {
+				std::cout << "Gathering State: " << state << std::endl;
+				if (state == rtc::PeerConnection::GatheringState::Complete) {
+					auto description = pc->conn->localDescription();
+					json message = {{"type", description->typeString()},
+					                {"sdp", std::string(description.value())}};
+					std::cout << "Please copy/paste this offer to the RECEIVER: " << message
+					          << std::endl;
+				}
+			});
+			rtc::Description::Video media("video", rtc::Description::Direction::SendOnly);
+			media.addH264Codec(96);
+			media.setBitrate(
+			    3000); // Request 3Mbps (Browsers do not encode more than 2.5MBps from a webcam)
+
+			media.addSSRC(targetSSRC, "video-send");
+
+			pc->track = pc->conn->addTrack(media);
+			pc->conn->setLocalDescription();
+
+			pc->track->onMessage([](rtc::binary var) {}, nullptr);
+
+			std::cout << "Please copy/paste the answer provided by the RECEIVER: " << std::endl;
+			std::string sdp;
+			std::getline(std::cin, sdp);
+			std::cout << "Got answer" << sdp << std::endl;
+			json j = json::parse(sdp);
+			rtc::Description answer(j["sdp"].get<std::string>(), j["type"].get<std::string>());
+			pc->conn->setRemoteDescription(answer);
+
+			receivers.push_back(pc);
+		}
+
+	} catch (const std::exception &e) {
+		std::cerr << "Error: " << e.what() << std::endl;
+	}
+}

examples/sfu-media/main.html

@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>libdatachannel media example</title>
+</head>
+<body>
+
+<div style="display:inline-block; width:40%;">
+    <h1>SENDER</h1>
+    <p id="send-help">Please enter the offer provided to you by the application: </p>
+    <textarea style="width:100%;" id=send-text rows="50"></textarea>
+    <button id=send-btn>Submit</button>
+</div>
+<div style="display:inline-block; width:40%;">
+    <h1>RECEIVER</h1>
+    <p id="recv-help">Please enter the offer provided to you by the application: </p>
+    <textarea id=recv-text style="width:100%;" rows="50"></textarea>
+    <button id=recv-btn>Submit</button>
+</div>
+<div id="videos">
+
+</div>
+<script>
+    document.querySelector('#send-btn').addEventListener('click',  async () => {
+        let offer = JSON.parse(document.querySelector('#send-text').value);
+        rtc = new RTCPeerConnection({
+            // Recommended for libdatachannel
+            bundlePolicy: "max-bundle",
+        });
+
+        rtc.onicegatheringstatechange = (state) => {
+            if (rtc.iceGatheringState === 'complete') {
+                // We only want to provide an answer once all of our candidates have been added to the SDP.
+                let answer = rtc.localDescription;
+                document.querySelector('#send-text').value = JSON.stringify({"type": answer.type, sdp: answer.sdp});
+                document.querySelector('#send-help').value = 'Please paste the answer in the application.';
+                alert('Please paste the answer in the application.');
+            }
+        }
+        await rtc.setRemoteDescription(offer);
+
+        let media = await navigator.mediaDevices.getUserMedia({
+            video: {
+                width: 1280,
+                height: 720
+            }
+        });
+        media.getTracks().forEach(track => rtc.addTrack(track, media));
+        let answer = await rtc.createAnswer();
+        await rtc.setLocalDescription(answer);
+    });
+
+    document.querySelector('#recv-btn').addEventListener('click',  async () => {
+        let offer = JSON.parse(document.querySelector('#recv-text').value);
+        rtc = new RTCPeerConnection({
+            // Recommended for libdatachannel
+            bundlePolicy: "max-bundle",
+        });
+
+        rtc.onicegatheringstatechange = (state) => {
+            if (rtc.iceGatheringState === 'complete') {
+                // We only want to provide an answer once all of our candidates have been added to the SDP.
+                let answer = rtc.localDescription;
+                document.querySelector('#recv-text').value = JSON.stringify({"type": answer.type, sdp: answer.sdp});
+                document.querySelector('#recv-help').value = 'Please paste the answer in the application.';
+                alert('Please paste the answer in the application.');
+            }
+        }
+        let trackCount = 0;
+        rtc.ontrack = (ev) => {
+            let thisID = trackCount++;
+
+            document.querySelector("#videos").innerHTML += "<video width=100% height=100% id='video-" + thisID + "'></video>";
+            let tracks = [];
+            rtc.getReceivers().forEach(recv => tracks.push(recv.track));
+            document.querySelector("#video-" + thisID).srcObject = new MediaStream(tracks);
+            document.querySelector("#video-" + thisID).play();
+        };
+        await rtc.setRemoteDescription(offer);
+        let answer = await rtc.createAnswer();
+        await rtc.setLocalDescription(answer);
+    });
+</script>
+
+</body>
+</html>

examples/signaling-server-python/LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU Affero General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
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+
+  To "convey" a work means any kind of propagation that enables other
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+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
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+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
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+  A "Standard Interface" means an interface that either is an official
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+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
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examples/signaling-server-python/signaling-server.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+#
+# Python signaling server example for libdatachannel
+# Copyright (c) 2020 Paul-Louis Ageneau
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import ssl
+import json
+import asyncio
+import logging
+import websockets
+
+
+logger = logging.getLogger('websockets')
+logger.setLevel(logging.INFO)
+logger.addHandler(logging.StreamHandler(sys.stdout))
+
+clients = {}
+
+
+async def handle_websocket(websocket, path):
+    client_id = None
+    try:
+        splitted = path.split('/')
+        splitted.pop(0)
+        client_id = splitted.pop(0)
+        print('Client {} connected'.format(client_id))
+
+        clients[client_id] = websocket
+        while True:
+            data = await websocket.recv()
+            print('Client {} << {}'.format(client_id, data))
+            message = json.loads(data)
+            destination_id = message['id']
+            destination_websocket = clients.get(destination_id)
+            if destination_websocket:
+                message['id'] = client_id
+                data = json.dumps(message)
+                print('Client {} >> {}'.format(destination_id, data))
+                await destination_websocket.send(data)
+            else:
+                print('Client {} not found'.format(destination_id))
+
+    except Exception as e:
+        print(e)
+
+    finally:
+        if client_id:
+            del clients[client_id]
+            print('Client {} disconnected'.format(client_id))
+
+if __name__ == '__main__':
+    # Usage: ./server.py [[host:]port] [SSL certificate file]
+    endpoint_or_port = sys.argv[1] if len(sys.argv) > 1 else "8000"
+    ssl_cert = sys.argv[2] if len(sys.argv) > 2 else None
+
+    endpoint = endpoint_or_port if ':' in endpoint_or_port else "127.0.0.1:" + endpoint_or_port
+
+    if ssl_cert:
+        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+        ssl_context.load_cert_chain(ssl_cert)
+    else:
+        ssl_context = None
+
+    print('Listening on {}'.format(endpoint))
+    host, port = endpoint.rsplit(':', 1)
+    start_server = websockets.serve(handle_websocket, host, int(port), ssl=ssl_context)
+    asyncio.get_event_loop().run_until_complete(start_server)
+    asyncio.get_event_loop().run_forever()

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examples/signaling-server-rust/Cargo.toml

@@ -0,0 +1,14 @@
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+authors = ["Paul-Louis Ageneau"]
+edition = "2018"
+
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+tungstenite = "*"
+tokio-tungstenite = "*"
+futures-util = "*"
+futures-channel = "*"
+json = "*"
+

examples/signaling-server-rust/LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.

examples/signaling-server-rust/src/main.rs

@@ -0,0 +1,110 @@
+/*
+ * Rust signaling server example for libdatachannel
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+extern crate tokio;
+extern crate tungstenite;
+extern crate futures_util;
+extern crate futures_channel;
+extern crate json;
+
+use std::env;
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
+
+use tokio::net::{TcpListener, TcpStream};
+use tungstenite::protocol::Message;
+use tungstenite::handshake::server::{Request, Response};
+
+use futures_util::{future, pin_mut, StreamExt};
+use futures_util::stream::TryStreamExt;
+use futures_channel::mpsc;
+
+type Id = String;
+type Tx = mpsc::UnboundedSender<Message>;
+type ClientsMap = Arc<Mutex<HashMap<Id, Tx>>>;
+
+async fn handle(clients: ClientsMap, stream: TcpStream) {
+    let mut client_id = Id::new();
+    let callback = |req: &Request, response: Response| {
+        let path: &str = req.uri().path();
+        let tokens: Vec<&str> = path.split('/').collect();
+        client_id = tokens[1].to_string();
+        return Ok(response);
+    };
+
+    let websocket = tokio_tungstenite::accept_hdr_async(stream, callback)
+        .await.expect("WebSocket handshake failed");
+	println!("Client {} connected", &client_id);
+
+    let (tx, rx) = mpsc::unbounded();
+    clients.lock().unwrap().insert(client_id.clone(), tx);
+
+    let (outgoing, incoming) = websocket.split();
+    let forward = rx.map(Ok).forward(outgoing);
+    let process = incoming.try_for_each(|msg| {
+        if msg.is_text() {
+            let text = msg.to_text().unwrap();
+            println!("Client {} << {}", &client_id, &text);
+
+            // Parse
+            let mut content = json::parse(text).unwrap();
+            let remote_id = content["id"].to_string();
+            let mut locked = clients.lock().unwrap();
+
+            match locked.get_mut(&remote_id) {
+                Some(remote) => {
+                    // Format
+                    content.insert("id", client_id.clone()).unwrap();
+                    let text = json::stringify(content);
+
+                    // Send to remote
+                    println!("Client {} >> {}", &remote_id, &text);
+                    remote.unbounded_send(Message::text(text)).unwrap();
+                },
+                _ => println!("Client {} not found", &remote_id),
+            }
+        }
+        future::ok(())
+    });
+
+    pin_mut!(process, forward);
+    future::select(process, forward).await;
+
+    println!("Client {} disconnected", &client_id);
+    clients.lock().unwrap().remove(&client_id);
+}
+
+#[tokio::main]
+async fn main() -> Result<(), std::io::Error> {
+    let service = env::args().nth(1).unwrap_or("8000".to_string());
+    let endpoint = if service.contains(':') { service } else { format!("127.0.0.1:{}", service) };
+
+	println!("Listening on {}", endpoint);
+
+    let mut listener = TcpListener::bind(endpoint)
+    	.await.expect("Listener binding failed");
+
+    let clients = ClientsMap::new(Mutex::new(HashMap::new()));
+
+    while let Ok((stream, _)) = listener.accept().await {
+        tokio::spawn(handle(clients.clone(), stream));
+    }
+
+    return Ok(())
+}
+

examples/web/LICENSE

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
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+License is intended to guarantee your freedom to share and change free
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+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
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+
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+price.  Our General Public Licenses are designed to make sure that you
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+
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+
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+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

examples/web/index.html

@@ -0,0 +1,23 @@
+<!doctype html>
+<html>
+    <head>
+		<meta charset="UTF-8">
+        <title>WebRTC Example</title>
+		<link rel="stylesheet" href="style.css">
+        <script src="script.js"></script>
+    </head>
+    <body>
+        <h1>WebRTC Example</h1>
+        <h2>Local ID</h2>
+        <p id="localId"></p>
+        <h2>Send an offer through signaling</h2>
+		<input type="text" id="offerId" placeholder="remote ID" disabled>
+		<input type="button" id="offerBtn" value="Offer" disabled>
+		<br>
+        <h2>Send a message through DataChannel</h2>
+        <input type="text" id="sendMsg" placeholder="message" disabled>
+        <input type="button" id="sendBtn" value="Send" disabled>
+        <br>
+    </body>
+</html>
+

examples/web/package-lock.json

@@ -0,0 +1,136 @@
+{
+  "name": "libdatachannel-example-web",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "requires": {
+        "node-gyp-build": "~3.7.0"
+      }
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+      "resolved": "https://registry.npmjs.org/d/-/d-1.0.1.tgz",
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+      "requires": {
+        "es5-ext": "^0.10.50",
+        "type": "^1.0.1"
+      }
+    },
+    "debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "es5-ext": {
+      "version": "0.10.53",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.53.tgz",
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+      "requires": {
+        "es6-iterator": "~2.0.3",
+        "es6-symbol": "~3.1.3",
+        "next-tick": "~1.0.0"
+      }
+    },
+    "es6-iterator": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
+      "integrity": "sha1-p96IkUGgWpSwhUQDstCg+/qY87c=",
+      "requires": {
+        "d": "1",
+        "es5-ext": "^0.10.35",
+        "es6-symbol": "^3.1.1"
+      }
+    },
+    "es6-symbol": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.3.tgz",
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+      "requires": {
+        "d": "^1.0.1",
+        "ext": "^1.1.2"
+      }
+    },
+    "ext": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/ext/-/ext-1.4.0.tgz",
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+      "requires": {
+        "type": "^2.0.0"
+      },
+      "dependencies": {
+        "type": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/type/-/type-2.1.0.tgz",
+          "integrity": "sha512-G9absDWvhAWCV2gmF1zKud3OyC61nZDwWvBL2DApaVFogI07CprggiQAOOjvp2NRjYWFzPyu7vwtDrQFq8jeSA=="
+        }
+      }
+    },
+    "is-typedarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz",
+      "integrity": "sha1-5HnICFjfDBsR3dppQPlgEfzaSpo="
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+    },
+    "next-tick": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/next-tick/-/next-tick-1.0.0.tgz",
+      "integrity": "sha1-yobR/ogoFpsBICCOPchCS524NCw="
+    },
+    "node-gyp-build": {
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/node-gyp-build/-/node-gyp-build-3.7.0.tgz",
+      "integrity": "sha512-L/Eg02Epx6Si2NXmedx+Okg+4UHqmaf3TNcxd50SF9NQGcJaON3AtU++kax69XV7YWz4tUspqZSAsVofhFKG2w=="
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+    },
+    "typedarray-to-buffer": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
+      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+      "requires": {
+        "is-typedarray": "^1.0.0"
+      }
+    },
+    "utf-8-validate": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.2.tgz",
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+      "requires": {
+        "node-gyp-build": "~3.7.0"
+      }
+    },
+    "websocket": {
+      "version": "1.0.32",
+      "resolved": "https://registry.npmjs.org/websocket/-/websocket-1.0.32.tgz",
+      "integrity": "sha512-i4yhcllSP4wrpoPMU2N0TQ/q0O94LRG/eUQjEAamRltjQ1oT1PFFKOG4i877OlJgCG8rw6LrrowJp+TYCEWF7Q==",
+      "requires": {
+        "bufferutil": "^4.0.1",
+        "debug": "^2.2.0",
+        "es5-ext": "^0.10.50",
+        "typedarray-to-buffer": "^3.1.5",
+        "utf-8-validate": "^5.0.2",
+        "yaeti": "^0.0.6"
+      }
+    },
+    "yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
+    }
+  }
+}

examples/web/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "libdatachannel-example-web",
+  "version": "0.0.1",
+  "description": "Example for libdatachannel",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/paullouisageneau/libdatachannel.git"
+  },
+  "author": "Paul-Louis Ageneau",
+  "license": "GPL-2.0",
+  "bugs": {
+    "url": "https://github.com/paullouisageneau/libdatachannel/issues"
+  },
+  "homepage": "https://github.com/paullouisageneau/libdatachannel#readme",
+  "dependencies": {
+    "websocket": "^1.0.32"
+  }
+}

examples/web/script.js

@@ -0,0 +1,195 @@
+/*
+ * libdatachannel example web client
+ * Copyright (C) 2020 Lara Mackey
+ * Copyright (C) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+window.addEventListener('load', () => {
+
+const config = {
+  iceServers: [{
+    urls: 'stun:stun.l.google.com:19302', // change to your STUN server
+  }],
+};
+
+const localId = randomId(4);
+
+const url = `ws://localhost:8000/${localId}`;
+
+const peerConnectionMap = {};
+const dataChannelMap = {};
+
+const offerId = document.getElementById('offerId');
+const offerBtn = document.getElementById('offerBtn');
+const sendMsg = document.getElementById('sendMsg');
+const sendBtn = document.getElementById('sendBtn');
+const _localId = document.getElementById('localId');
+_localId.textContent = localId;
+
+console.log('Connecting to signaling...');
+openSignaling(url)
+  .then((ws) => {
+    console.log('WebSocket connected, signaling ready');
+    offerId.disabled = false;
+    offerBtn.disabled = false;
+    offerBtn.onclick = () => offerPeerConnection(ws, offerId.value);
+  })
+  .catch((err) => console.error(err));
+
+
+function openSignaling(url) {
+  return new Promise((resolve, reject) => {
+    const ws = new WebSocket(url);
+    ws.onopen = () => resolve(ws);
+    ws.onerror = () => reject(new Error('WebSocket error'));
+    ws.onclose = () => console.error('WebSocket disconnected');
+    ws.onmessage = (e) => {
+      if(typeof(e.data) != 'string') return;
+      const message = JSON.parse(e.data);
+      console.log(message);
+      const { id, type } = message;
+
+      let pc = peerConnectionMap[id];
+      if(!pc) {
+		    if(type != 'offer') return;
+
+			  // Create PeerConnection for answer
+			  console.log(`Answering to ${id}`);
+			  pc = createPeerConnection(ws, id);
+		  }
+
+      switch(type) {
+      case 'offer':
+      case 'answer':
+			  pc.setRemoteDescription({
+			    sdp: message.description,
+			    type: message.type,
+			  })
+			  .then(() => {
+          if(type == 'offer') {
+			      // Send answer
+            sendLocalDescription(ws, id, pc, 'answer');
+          }
+			  });
+			  break;
+
+			case 'candidate':
+		    pc.addIceCandidate({
+          candidate: message.candidate,
+          sdpMid: message.mid,
+		    });
+		    break;
+		  }
+    }
+  });
+}
+
+function offerPeerConnection(ws, id) {
+	// Create PeerConnection
+	console.log(`Offering to ${id}`);
+	pc = createPeerConnection(ws, id);
+
+  // Create DataChannel
+  const label = "test";
+  console.log(`Creating DataChannel with label "${label}"`);
+  const dc = pc.createDataChannel(label);
+  setupDataChannel(dc, id);
+
+  // Send offer
+  sendLocalDescription(ws, id, pc, 'offer');
+}
+
+// Create and setup a PeerConnection
+function createPeerConnection(ws, id) {
+  const pc = new RTCPeerConnection(config);
+  pc.onconnectionstatechange = () => console.log(`Connection state: ${pc.connectionState}`);
+  pc.onicegatheringstatechange = () => console.log(`Gathering state: ${pc.iceGatheringState}`);
+  pc.onicecandidate = (e) => {
+    if (e.candidate) {
+      // Send candidate
+      sendLocalCandidate(ws, id, e.candidate);
+    }
+  };
+  pc.ondatachannel = (e) => {
+    const dc = e.channel;
+    console.log(`"DataChannel from ${id} received with label "${dc.label}"`);
+    setupDataChannel(dc, id);
+
+		dc.send(`Hello from ${localId}`);
+
+    sendMsg.disabled = false;
+    sendBtn.disabled = false;
+    sendBtn.onclick = () => dc.send(sendMsg.value);
+  };
+
+  peerConnectionMap[id] = pc;
+  return pc;
+}
+
+// Setup a DataChannel
+function setupDataChannel(dc, id) {
+  dc.onopen = () => {
+    console.log(`DataChannel from ${id} open`);
+
+    sendMsg.disabled = false;
+    sendBtn.disabled = false;
+    sendBtn.onclick = () => dc.send(sendMsg.value);
+  };
+  dc.onclose = () => {
+    console.log(`DataChannel from ${id} closed`);
+  };
+	dc.onmessage = (e) => {
+    if(typeof(e.data) != 'string') return;
+		console.log(`Message from ${id} received: ${e.data}`);
+    document.body.appendChild(document.createTextNode(e.data));
+	};
+
+  dataChannelMap[id] = dc;
+  return dc;
+}
+
+function sendLocalDescription(ws, id, pc, type) {
+  (type == 'offer' ? pc.createOffer() : pc.createAnswer())
+    .then((desc) => pc.setLocalDescription(desc))
+    .then(() => {
+      const { sdp, type } = pc.localDescription;
+      ws.send(JSON.stringify({
+        id,
+        type,
+        description: sdp,
+      }));
+    });
+}
+
+function sendLocalCandidate(ws, id, cand) {
+  const {candidate, sdpMid} = cand;
+  ws.send(JSON.stringify({
+    id,
+    type: 'candidate',
+    candidate,
+    mid: sdpMid,
+  }));
+}
+
+// Helper function to generate a random ID
+function randomId(length) {
+  const characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+  const pickRandom = () => characters.charAt(Math.floor(Math.random() * characters.length));
+  return [...Array(length)].map(pickRandom).join('');
+}
+
+});
+

examples/web/server.js

@@ -0,0 +1,109 @@
+/*
+ * libdatachannel example web server
+ * Copyright (C) 2020 Lara Mackey
+ * Copyright (C) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+const fs = require('fs');
+const http = require('http');
+const websocket = require('websocket');
+
+const staticFiles = {
+  '/index.html': 'text/html',
+  '/style.css': 'text/css',
+  '/script.js': 'text/javascript',
+};
+
+const clients = {};
+
+const httpServer = http.createServer((req, res) => {
+  console.log(`${req.method.toUpperCase()} ${req.url}`);
+
+  const respond = (code, data, contentType = 'text/plain') => {
+    res.writeHead(code, {
+      'Content-Type': contentType,
+      'Access-Control-Allow-Origin': '*',
+    });
+    res.end(data);
+  };
+
+  if(req.method != 'GET') {
+    respond(405, 'Method not allowed');
+    return;
+  }
+
+  const url = req.url == '/' ? '/index.html' : req.url;
+  const contentType = staticFiles[url];
+  if(!contentType) {
+    respond(404, 'Not found');
+    return;
+  }
+
+  fs.readFile(__dirname + url, (err, data) => {
+    if(err) {
+      respond(500, 'Missing file');
+      return;
+    }
+
+    respond(200, data, contentType);
+  });
+});
+
+const wsServer = new websocket.server({ httpServer });
+wsServer.on('request', (req) => {
+  console.log(`WS  ${req.resource}`);
+
+  const { path } = req.resourceURL;
+  const splitted = path.split('/');
+  splitted.shift();
+  const id = splitted[0];
+
+  const conn = req.accept(null, req.origin);
+  conn.on('message', (data) => {
+    if(data.type === 'utf8') {
+      console.log(`Client ${id} << ${data.utf8Data}`);
+
+      const message = JSON.parse(data.utf8Data);
+      const destId = message.id;
+      const dest = clients[destId];
+      if(dest) {
+        message.id = id;
+        const data = JSON.stringify(message);
+        console.log(`Client ${destId} >> ${data}`);
+        dest.send(data);
+      }
+      else {
+        console.error(`Client ${destId} not found`);
+      }
+    }
+  });
+  conn.on('close', () => {
+    delete clients[id];
+    console.error(`Client ${id} disconnected`);
+  });
+
+  clients[id] = conn;
+});
+
+const endpoint = process.env.PORT || '8000';
+const splitted = endpoint.split(':');
+const port = splitted.pop();
+const hostname = splitted.join(':') || '127.0.0.1';
+
+httpServer.listen(port, hostname, () => {
+  console.log(`Server listening on ${hostname}:${port}`);
+});
+

examples/web/style.css

@@ -0,0 +1,20 @@
+body {
+	font-family: arial, verdana, sans-serif;
+	font-size: 12pt;
+	background-color: #FFFFFF;
+	color: #000000;
+	margin: 0;
+	padding: 0.5em;
+}
+
+input {
+	font-size: 100%;
+	vertical-align: middle;
+}
+
+input[type="text"] {
+	width: 8em;
+	max-width: 75%;
+	padding: 0.4em;
+}
+

include/rtc/candidate.hpp

@@ -25,22 +25,59 @@
 
 namespace rtc {
 
-class Candidate {
+class RTC_CPP_EXPORT Candidate {
 public:
-	Candidate(string candidate, string mid = "");
+	enum class Family { Unresolved, Ipv4, Ipv6 };
+	enum class Type { Unknown, Host, ServerReflexive, PeerReflexive, Relayed };
+	enum class TransportType { Unknown, Udp, TcpActive, TcpPassive, TcpSo, TcpUnknown };
 
+	Candidate();
+	Candidate(string candidate);
+	Candidate(string candidate, string mid);
+
+	void hintMid(string mid);
+
+	enum class ResolveMode { Simple, Lookup };
+	bool resolve(ResolveMode mode = ResolveMode::Simple);
+
+	Type type() const;
+	TransportType transportType() const;
+	uint32_t priority() const;
 	string candidate() const;
 	string mid() const;
 	operator string() const;
 
+	bool operator==(const Candidate &other) const;
+	bool operator!=(const Candidate &other) const;
+
+	bool isResolved() const;
+	Family family() const;
+	std::optional<string> address() const;
+	std::optional<uint16_t> port() const;
+
 private:
-	string mCandidate;
+	void parse(string candidate);
-	string mMid;
+
+	string mFoundation;
+	uint32_t mComponent, mPriority;
+	string mTypeString, mTransportString;
+	Type mType;
+	TransportType mTransportType;
+	string mNode, mService;
+	string mTail;
+
+	std::optional<string> mMid;
+
+	// Extracted on resolution
+	Family mFamily;
+	string mAddress;
+	uint16_t mPort;
 };
 
 } // namespace rtc
 
-std::ostream &operator<<(std::ostream &out, const rtc::Candidate &candidate);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Candidate &candidate);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Candidate::Type &type);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Candidate::TransportType &transportType);
 
 #endif
-

include/rtc/channel.hpp

@@ -20,38 +20,64 @@
 #define RTC_CHANNEL_H
 
 #include "include.hpp"
+#include "message.hpp"
 
+#include <atomic>
 #include <functional>
 #include <variant>
 
 namespace rtc {
 
-class Channel {
+class RTC_CPP_EXPORT Channel {
 public:
-	virtual void close(void) = 0;
+	Channel() = default;
-	virtual void send(const std::variant<binary, string> &data) = 0;
+	virtual ~Channel() = default;
 
-	virtual bool isOpen(void) const = 0;
+	virtual void close() = 0;
-	virtual bool isClosed(void) const = 0;
+	virtual bool send(message_variant data) = 0; // returns false if buffered
+	virtual bool send(const byte *data, size_t size) = 0;
+
+	virtual bool isOpen() const = 0;
+	virtual bool isClosed() const = 0;
+	virtual size_t maxMessageSize() const; // max message size in a call to send
+	virtual size_t bufferedAmount() const; // total size buffered to send
 
 	void onOpen(std::function<void()> callback);
 	void onClosed(std::function<void()> callback);
-	void onError(std::function<void(const string &error)> callback);
+	void onError(std::function<void(string error)> callback);
-	void onMessage(std::function<void(const std::variant<binary, string> &data)> callback);
+
-	void onMessage(std::function<void(const binary &data)> binaryCallback,
+	void onMessage(std::function<void(message_variant data)> callback);
-	               std::function<void(const string &data)> stringCallback);
+	void onMessage(std::function<void(binary data)> binaryCallback,
+	               std::function<void(string data)> stringCallback);
+
+	void onBufferedAmountLow(std::function<void()> callback);
+	void setBufferedAmountLowThreshold(size_t amount);
+
+	// Extended API
+	virtual std::optional<message_variant> receive() = 0; // only if onMessage unset
+	virtual std::optional<message_variant> peek() = 0;    // only if onMessage unset
+	virtual size_t availableAmount() const;               // total size available to receive
+	void onAvailable(std::function<void()> callback);
 
 protected:
-	virtual void triggerOpen(void);
+	virtual void triggerOpen();
-	virtual void triggerClosed(void);
+	virtual void triggerClosed();
-	virtual void triggerError(const string &error);
+	virtual void triggerError(string error);
-	virtual void triggerMessage(const std::variant<binary, string> &data);
+	virtual void triggerAvailable(size_t count);
+	virtual void triggerBufferedAmount(size_t amount);
+
+	void resetCallbacks();
 
 private:
-	std::function<void()> mOpenCallback;
+	synchronized_callback<> mOpenCallback;
-	std::function<void()> mClosedCallback;
+	synchronized_callback<> mClosedCallback;
-	std::function<void(const string &)> mErrorCallback;
+	synchronized_callback<string> mErrorCallback;
-	std::function<void(const std::variant<binary, string> &)> mMessageCallback;
+	synchronized_callback<message_variant> mMessageCallback;
+	synchronized_callback<> mAvailableCallback;
+	synchronized_callback<> mBufferedAmountLowCallback;
+
+	std::atomic<size_t> mBufferedAmount = 0;
+	std::atomic<size_t> mBufferedAmountLowThreshold = 0;
 };
 
 } // namespace rtc

include/rtc/configuration.hpp

@@ -26,17 +26,48 @@
 
 namespace rtc {
 
-struct IceServer {
+struct RTC_CPP_EXPORT IceServer {
-	IceServer(const string &host_);
+	enum class Type { Stun, Turn };
-	IceServer(const string &hostname_, uint16_t port_);
+	enum class RelayType { TurnUdp, TurnTcp, TurnTls };
-	IceServer(const string &hostname_, const string &service_);
+
+	// Any type
+	IceServer(const string &url);
+
+	// STUN
+	IceServer(string hostname_, uint16_t port_);
+	IceServer(string hostname_, string service_);
+
+	// TURN
+	IceServer(string hostname_, uint16_t port, string username_, string password_,
+	          RelayType relayType_ = RelayType::TurnUdp);
+	IceServer(string hostname_, string service_, string username_, string password_,
+	          RelayType relayType_ = RelayType::TurnUdp);
 
 	string hostname;
 	string service;
+	Type type;
+	string username;
+	string password;
+	RelayType relayType;
 };
 
-struct Configuration {
+struct RTC_CPP_EXPORT ProxyServer {
+	enum class Type { None = 0, Socks5, Http, Last = Http };
+
+	ProxyServer(Type type_, string ip_, uint16_t port_, string username_ = "",
+	            string password_ = "");
+
+	Type type;
+	string ip;
+	uint16_t port;
+	string username;
+	string password;
+};
+
+struct RTC_CPP_EXPORT Configuration {
 	std::vector<IceServer> iceServers;
+	std::optional<ProxyServer> proxyServer;
+	bool enableIceTcp = false;
 	uint16_t portRangeBegin = 1024;
 	uint16_t portRangeEnd = 65535;
 };

include/rtc/datachannel.hpp

@@ -22,10 +22,13 @@
 #include "channel.hpp"
 #include "include.hpp"
 #include "message.hpp"
+#include "queue.hpp"
 #include "reliability.hpp"
 
+#include <atomic>
 #include <chrono>
 #include <functional>
+#include <type_traits>
 #include <variant>
 
 namespace rtc {
@@ -33,41 +36,100 @@ namespace rtc {
 class SctpTransport;
 class PeerConnection;
 
-class DataChannel : public Channel {
+class RTC_CPP_EXPORT DataChannel : public std::enable_shared_from_this<DataChannel>, public Channel {
 public:
-	DataChannel(unsigned int stream_, string label_, string protocol_, Reliability reliability_);
+	DataChannel(std::weak_ptr<PeerConnection> pc, uint16_t stream, string label, string protocol,
-	DataChannel(unsigned int stream, std::shared_ptr<SctpTransport> sctpTransport);
+	            Reliability reliability);
-	~DataChannel();
+	virtual ~DataChannel();
 
-	void close(void);
+	uint16_t stream() const;
-	void send(const std::variant<binary, string> &data);
+	uint16_t id() const;
-	void send(const byte *data, size_t size);
-
-	unsigned int stream() const;
 	string label() const;
 	string protocol() const;
 	Reliability reliability() const;
 
-	bool isOpen(void) const;
+	void close(void) override;
-	bool isClosed(void) const;
+	bool send(message_variant data) override;
+	bool send(const byte *data, size_t size) override;
+	template <typename Buffer> bool sendBuffer(const Buffer &buf);
+	template <typename Iterator> bool sendBuffer(Iterator first, Iterator last);
 
-private:
+	bool isOpen(void) const override;
-	void open(std::shared_ptr<SctpTransport> sctpTransport);
+	bool isClosed(void) const override;
+	size_t maxMessageSize() const override;
+
+	// Extended API
+	size_t availableAmount() const override;
+	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
+
+protected:
+	virtual void open(std::shared_ptr<SctpTransport> transport);
+	virtual void processOpenMessage(message_ptr message);
+	void remoteClose();
+	bool outgoing(message_ptr message);
 	void incoming(message_ptr message);
-	void processOpenMessage(message_ptr message);
 
-	const unsigned int mStream;
+	const std::weak_ptr<PeerConnection> mPeerConnection;
-	std::shared_ptr<SctpTransport> mSctpTransport;
+	std::weak_ptr<SctpTransport> mSctpTransport;
+
+	uint16_t mStream;
 	string mLabel;
 	string mProtocol;
 	std::shared_ptr<Reliability> mReliability;
 
-	bool mIsOpen = false;
+	std::atomic<bool> mIsOpen = false;
-	bool mIsClosed = false;
+	std::atomic<bool> mIsClosed = false;
+
+private:
+	Queue<message_ptr> mRecvQueue;
 
 	friend class PeerConnection;
 };
 
+class RTC_CPP_EXPORT NegociatedDataChannel final : public DataChannel {
+public:
+	NegociatedDataChannel(std::weak_ptr<PeerConnection> pc, uint16_t stream, string label,
+	                      string protocol, Reliability reliability);
+	NegociatedDataChannel(std::weak_ptr<PeerConnection> pc, std::weak_ptr<SctpTransport> transport,
+	                      uint16_t stream);
+	~NegociatedDataChannel();
+
+private:
+	void open(std::shared_ptr<SctpTransport> transport) override;
+	void processOpenMessage(message_ptr message) override;
+
+	friend class PeerConnection;
+};
+
+template <typename Buffer> std::pair<const byte *, size_t> to_bytes(const Buffer &buf) {
+	using T = typename std::remove_pointer<decltype(buf.data())>::type;
+	using E = typename std::conditional<std::is_void<T>::value, byte, T>::type;
+	return std::make_pair(static_cast<const byte *>(static_cast<const void *>(buf.data())),
+	                      buf.size() * sizeof(E));
+}
+
+template <typename Buffer> bool DataChannel::sendBuffer(const Buffer &buf) {
+	auto [bytes, size] = to_bytes(buf);
+	auto message = std::make_shared<Message>(size);
+	std::copy(bytes, bytes + size, message->data());
+	return outgoing(message);
+}
+
+template <typename Iterator> bool DataChannel::sendBuffer(Iterator first, Iterator last) {
+	size_t size = 0;
+	for (Iterator it = first; it != last; ++it)
+		size += it->size();
+
+	auto message = std::make_shared<Message>(size);
+	auto pos = message->begin();
+	for (Iterator it = first; it != last; ++it) {
+		auto [bytes, len] = to_bytes(*it);
+		pos = std::copy(bytes, bytes + len, pos);
+	}
+	return outgoing(message);
+}
+
 } // namespace rtc
 
 #endif

include/rtc/description.hpp

@@ -1,5 +1,6 @@
 /**
- * Copyright (c) 2019 Paul-Louis Ageneau
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
+ * Copyright (c) 2020 Staz Modrzynski
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -24,51 +25,247 @@
 
 #include <iostream>
 #include <map>
+#include <memory>
 #include <optional>
+#include <variant>
 #include <vector>
 
 namespace rtc {
 
-class Description {
+const string DEFAULT_AUDIO_PROFILE =
-public:
+    "minptime=10;maxaveragebitrate=96000;stereo=1;sprop-stereo=1;useinbandfec=1";
-	enum class Type { Unspec = 0, Offer = 1, Answer = 2 };
-	enum class Role { ActPass = 0, Passive = 1, Active = 2 };
 
-	Description(const string &sdp, const string &typeString = "");
+// Use Constrained Baseline profile Level 4.2 (necessary for Firefox)
-	Description(const string &sdp, Type type, Role role);
+// https://developer.mozilla.org/en-US/docs/Web/Media/Formats/WebRTC_codecs#Supported_video_codecs
+// TODO: Should be 42E0 but 42C0 appears to be more compatible. Investigate this.
+const string DEFAULT_VIDEO_PROFILE =
+    "profile-level-id=42e01f;packetization-mode=1;level-asymmetry-allowed=1";
+
+class RTC_CPP_EXPORT Description {
+public:
+	enum class Type { Unspec, Offer, Answer, Pranswer, Rollback };
+	enum class Role { ActPass, Passive, Active };
+	enum class Direction { SendOnly, RecvOnly, SendRecv, Inactive, Unknown };
+
+	Description(const string &sdp, Type type = Type::Unspec, Role role = Role::ActPass);
+	Description(const string &sdp, string typeString);
 
 	Type type() const;
 	string typeString() const;
 	Role role() const;
-	string roleString() const;
+	string bundleMid() const;
-	string mid() const;
+	std::optional<string> iceUfrag() const;
+	std::optional<string> icePwd() const;
 	std::optional<string> fingerprint() const;
-	std::optional<uint16_t> sctpPort() const;
+	bool ended() const;
 
+	void hintType(Type type);
 	void setFingerprint(string fingerprint);
-	void setSctpPort(uint16_t port);
+
-	void addCandidate(std::optional<Candidate> candidate);
+	bool hasCandidate(const Candidate &candidate) const;
+	void addCandidate(Candidate candidate);
+	void addCandidates(std::vector<Candidate> candidates);
+	void endCandidates();
+	std::vector<Candidate> extractCandidates();
 
 	operator string() const;
+	string generateSdp(string_view eol) const;
+	string generateApplicationSdp(string_view eol) const;
 
-private:
+	class RTC_CPP_EXPORT Entry {
-	Type mType;
+	public:
-	Role mRole;
+		virtual ~Entry() = default;
-	string mSessionId;
+
-	string mMid;
+		virtual string type() const { return mType; }
-	string mIceUfrag, mIcePwd;
+		virtual string description() const { return mDescription; }
-	std::optional<string> mFingerprint;
+		virtual string mid() const { return mMid; }
-	std::optional<uint16_t> mSctpPort;
+		Direction direction() const { return mDirection; }
-	std::vector<Candidate> mCandidates;
+		void setDirection(Direction dir);
-	bool mTrickle;
+
+		operator string() const;
+		string generateSdp(string_view eol, string_view addr, string_view port) const;
+
+		virtual void parseSdpLine(string_view line);
+
+		std::vector<string>::iterator beginAttributes();
+		std::vector<string>::iterator endAttributes();
+		std::vector<string>::iterator removeAttribute(std::vector<string>::iterator iterator);
+
+	protected:
+		Entry(const string &mline, string mid, Direction dir = Direction::Unknown);
+		virtual string generateSdpLines(string_view eol) const;
+
+		std::vector<string> mAttributes;
+
+	private:
+		string mType;
+		string mDescription;
+		string mMid;
+		Direction mDirection;
+	};
+
+	struct RTC_CPP_EXPORT Application : public Entry {
+	public:
+		Application(string mid = "data");
+		virtual ~Application() = default;
+
+		string description() const override;
+		Application reciprocate() const;
+
+		void setSctpPort(uint16_t port) { mSctpPort = port; }
+		void hintSctpPort(uint16_t port) { mSctpPort = mSctpPort.value_or(port); }
+		void setMaxMessageSize(size_t size) { mMaxMessageSize = size; }
+
+		std::optional<uint16_t> sctpPort() const { return mSctpPort; }
+		std::optional<size_t> maxMessageSize() const { return mMaxMessageSize; }
+
+		virtual void parseSdpLine(string_view line) override;
+
+	private:
+		virtual string generateSdpLines(string_view eol) const override;
+
+		std::optional<uint16_t> mSctpPort;
+		std::optional<size_t> mMaxMessageSize;
+	};
+
+	// Media (non-data)
+	class RTC_CPP_EXPORT Media : public Entry {
+	public:
+		Media(const string &sdp);
+		Media(const string &mline, string mid, Direction dir = Direction::SendOnly);
+		virtual ~Media() = default;
+
+		string description() const override;
+		Media reciprocate() const;
+
+		void removeFormat(const string &fmt);
+
+		void addSSRC(uint32_t ssrc, std::optional<string> name,
+		             std::optional<string> msid = nullopt);
+		void replaceSSRC(uint32_t oldSSRC, uint32_t ssrc, std::optional<string> name,
+		                 std::optional<string> msid = nullopt);
+		bool hasSSRC(uint32_t ssrc);
+		std::vector<uint32_t> getSSRCs();
+
+		void setBitrate(int bitrate);
+		int getBitrate() const;
+
+		bool hasPayloadType(int payloadType) const;
+
+		void addRTXCodec(unsigned int payloadType, unsigned int originalPayloadType,
+		                 unsigned int clockRate);
+
+		virtual void parseSdpLine(string_view line) override;
+
+		struct RTPMap {
+			RTPMap(string_view mline);
+			RTPMap() {}
+
+			void removeFB(const string &string);
+			void addFB(const string &string);
+			void addAttribute(string attr) { fmtps.emplace_back(std::move(attr)); }
+
+			int pt;
+			string format;
+			int clockRate;
+			string encParams;
+
+			std::vector<string> rtcpFbs;
+			std::vector<string> fmtps;
+
+			static int parsePT(string_view view);
+			void setMLine(string_view view);
+		};
+
+		std::map<int, RTPMap>::iterator beginMaps();
+		std::map<int, RTPMap>::iterator endMaps();
+		std::map<int, RTPMap>::iterator removeMap(std::map<int, RTPMap>::iterator iterator);
+
+	private:
+		virtual string generateSdpLines(string_view eol) const override;
+
+		int mBas = -1;
+
+		Media::RTPMap &getFormat(int fmt);
+		Media::RTPMap &getFormat(const string &fmt);
+
+		std::map<int, RTPMap> mRtpMap;
+		std::vector<uint32_t> mSsrcs;
+
+	public:
+		void addRTPMap(const RTPMap &map);
+
+		void removeSSRC(uint32_t oldSSRC);
+	};
+
+	class RTC_CPP_EXPORT Audio : public Media {
+	public:
+		Audio(string mid = "audio", Direction dir = Direction::SendOnly);
+
+		void addAudioCodec(int payloadType, string codec,
+		                   std::optional<string> profile = DEFAULT_AUDIO_PROFILE);
+
+		void addOpusCodec(int payloadType);
+	};
+
+	class RTC_CPP_EXPORT Video : public Media {
+	public:
+		Video(string mid = "video", Direction dir = Direction::SendOnly);
+
+		void addVideoCodec(int payloadType, string codec,
+		                   std::optional<string> profile = DEFAULT_VIDEO_PROFILE);
+
+		void addH264Codec(int payloadType);
+		void addVP8Codec(int payloadType);
+		void addVP9Codec(int payloadType);
+	};
+
+	bool hasApplication() const;
+	bool hasAudioOrVideo() const;
+	bool hasMid(string_view mid) const;
+
+	int addMedia(Media media);
+	int addMedia(Application application);
+	int addApplication(string mid = "data");
+	int addVideo(string mid = "video", Direction dir = Direction::SendOnly);
+	int addAudio(string mid = "audio", Direction dir = Direction::SendOnly);
+
+	std::variant<Media *, Application *> media(unsigned int index);
+	std::variant<const Media *, const Application *> media(unsigned int index) const;
+	unsigned int mediaCount() const;
+
+	Application *application();
 
 	static Type stringToType(const string &typeString);
 	static string typeToString(Type type);
-	static string roleToString(Role role);
+
+private:
+	std::optional<Candidate> defaultCandidate() const;
+	std::shared_ptr<Entry> createEntry(string mline, string mid, Direction dir);
+	void removeApplication();
+
+	Type mType;
+
+	// Session-level attributes
+	Role mRole;
+	string mUsername;
+	string mSessionId;
+	std::optional<string> mIceUfrag, mIcePwd;
+	std::optional<string> mFingerprint;
+
+	// Entries
+	std::vector<std::shared_ptr<Entry>> mEntries;
+	std::shared_ptr<Application> mApplication;
+
+	// Candidates
+	std::vector<Candidate> mCandidates;
+	bool mEnded = false;
 };
 
 } // namespace rtc
 
-std::ostream &operator<<(std::ostream &out, const rtc::Description &description);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, const rtc::Description &description);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::Description::Type type);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::Description::Role role);
 
 #endif

include/rtc/include.hpp

@@ -19,19 +19,47 @@
 #ifndef RTC_INCLUDE_H
 #define RTC_INCLUDE_H
 
+#ifndef RTC_ENABLE_MEDIA
+#define RTC_ENABLE_MEDIA 1
+#endif
+
+#ifndef RTC_ENABLE_WEBSOCKET
+#define RTC_ENABLE_WEBSOCKET 1
+#endif
+
+#ifdef _WIN32
+#define RTC_CPP_EXPORT __declspec(dllexport)
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0602 // Windows 8
+#endif
+#ifdef _MSC_VER
+#pragma warning(disable:4251) // disable "X needs to have dll-interface..."
+#endif
+#else
+#define RTC_CPP_EXPORT
+#endif
+
+#include "log.hpp"
+
 #include <cstddef>
+#include <functional>
 #include <memory>
+#include <mutex>
 #include <optional>
+#include <string>
+#include <string_view>
 #include <vector>
 
 namespace rtc {
 
 using std::byte;
 using std::string;
+using std::string_view;
 using binary = std::vector<byte>;
 
 using std::nullopt;
 
+using std::size_t;
 using std::uint16_t;
 using std::uint32_t;
 using std::uint64_t;
@@ -40,10 +68,92 @@ using std::uint8_t;
 const size_t MAX_NUMERICNODE_LEN = 48; // Max IPv6 string representation length
 const size_t MAX_NUMERICSERV_LEN = 6;  // Max port string representation length
 
-const uint16_t DEFAULT_SCTP_PORT = 5000; // SCTP port to use by default
+const uint16_t DEFAULT_SCTP_PORT = 5000;          // SCTP port to use by default
+const size_t DEFAULT_MAX_MESSAGE_SIZE = 65536;    // Remote max message size if not specified in SDP
+const size_t LOCAL_MAX_MESSAGE_SIZE = 256 * 1024; // Local max message size
 
+const size_t RECV_QUEUE_LIMIT = 1024 * 1024; // Max per-channel queue size
+
+const int THREADPOOL_SIZE = 4; // Number of threads in the global thread pool
+
+// overloaded helper
 template <class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
-template <class... Ts> overloaded(Ts...)->overloaded<Ts...>;
+template <class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
+
+// weak_ptr bind helper
+template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t, Args &&... _args) {
+	return [bound = std::bind(f, t, _args...), weak_this = t->weak_from_this()](auto &&... args) {
+		using result_type = typename decltype(bound)::result_type;
+		if (auto shared_this = weak_this.lock())
+			return bound(args...);
+		else
+			return static_cast<result_type>(false);
+	};
 }
 
+// scope_guard helper
+class scope_guard {
+public:
+	scope_guard(std::function<void()> func) : function(std::move(func)) {}
+	scope_guard(scope_guard &&other) = delete;
+	scope_guard(const scope_guard &) = delete;
+	void operator=(const scope_guard &) = delete;
+
+	~scope_guard() {
+		if (function)
+			function();
+	}
+
+private:
+	std::function<void()> function;
+};
+
+template <typename... Args> class synchronized_callback {
+public:
+	synchronized_callback() = default;
+	synchronized_callback(synchronized_callback &&cb) { *this = std::move(cb); }
+	synchronized_callback(const synchronized_callback &cb) { *this = cb; }
+	synchronized_callback(std::function<void(Args...)> func) { *this = std::move(func); }
+	~synchronized_callback() { *this = nullptr; }
+
+	synchronized_callback &operator=(synchronized_callback &&cb) {
+		std::scoped_lock lock(mutex, cb.mutex);
+		callback = std::move(cb.callback);
+		cb.callback = nullptr;
+		return *this;
+	}
+
+	synchronized_callback &operator=(const synchronized_callback &cb) {
+		std::scoped_lock lock(mutex, cb.mutex);
+		callback = cb.callback;
+		return *this;
+	}
+
+	synchronized_callback &operator=(std::function<void(Args...)> func) {
+		std::lock_guard lock(mutex);
+		callback = std::move(func);
+		return *this;
+	}
+
+	void operator()(Args... args) const {
+		std::lock_guard lock(mutex);
+		if (callback)
+			callback(std::move(args)...);
+	}
+
+	operator bool() const {
+		std::lock_guard lock(mutex);
+		return callback ? true : false;
+	}
+
+	std::function<void(Args...)> wrap() const {
+		return [this](Args... args) { (*this)(std::move(args)...); };
+	}
+
+private:
+	std::function<void(Args...)> callback;
+	mutable std::recursive_mutex mutex;
+};
+} // namespace rtc
+
 #endif

include/rtc/init.hpp

@@ -0,0 +1,52 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_INIT_H
+#define RTC_INIT_H
+
+#include "include.hpp"
+
+#include <mutex>
+
+namespace rtc {
+
+using init_token = std::shared_ptr<void>;
+
+class RTC_CPP_EXPORT Init {
+public:
+	static init_token Token();
+	static void Preload();
+	static void Cleanup();
+
+	~Init();
+
+private:
+	Init();
+
+	static std::weak_ptr<void> Weak;
+	static std::shared_ptr<void> *Global;
+	static bool Initialized;
+	static std::recursive_mutex Mutex;
+};
+
+inline void Preload() { Init::Preload(); }
+inline void Cleanup() { Init::Cleanup(); }
+
+} // namespace rtc
+
+#endif

include/rtc/log.hpp

@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) 2019 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_LOG_H
+#define RTC_LOG_H
+
+// Disable warnings before including plog
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wall"
+#elif defined(_MSC_VER)
+#pragma warning(push, 0)
+#endif
+
+#include "plog/Log.h"
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic pop
+#elif defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
+#include "include.hpp"
+
+namespace rtc {
+
+enum class LogLevel { // Don't change, it must match plog severity
+	None = 0,
+	Fatal = 1,
+	Error = 2,
+	Warning = 3,
+	Info = 4,
+	Debug = 5,
+	Verbose = 6
+};
+
+RTC_CPP_EXPORT void InitLogger(LogLevel level);
+RTC_CPP_EXPORT void InitLogger(plog::Severity severity, plog::IAppender *appender = nullptr);
+} // namespace rtc
+
+#endif

include/rtc/message.hpp

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2019 Paul-Louis Ageneau
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -24,32 +24,58 @@
 
 #include <functional>
 #include <memory>
+#include <optional>
+#include <variant>
 
 namespace rtc {
 
-struct Message : binary {
+struct RTC_CPP_EXPORT Message : binary {
-	enum Type { Binary, String, Control };
+	enum Type { Binary, String, Control, Reset };
+
+	Message(const Message &message) = default;
+	Message(size_t size, Type type_ = Binary) : binary(size), type(type_) {}
 
 	template <typename Iterator>
-	Message(Iterator begin_, Iterator end_, Type type_ = Binary, unsigned int stream_ = 0,
+	Message(Iterator begin_, Iterator end_, Type type_ = Binary)
-	        std::shared_ptr<Reliability> reliability_ = nullptr)
+	    : binary(begin_, end_), type(type_) {}
-	    : binary(begin_, end_), type(type_), stream(stream_), reliability(reliability_) {}
+
+	Message(binary &&data, Type type_ = Binary) : binary(std::move(data)), type(type_) {}
 
 	Type type;
-	unsigned int stream;
+	unsigned int stream = 0; // Stream id (SCTP stream or SSRC)
+	unsigned int dscp = 0;   // Differentiated Services Code Point
 	std::shared_ptr<Reliability> reliability;
 };
 
-using message_ptr = std::shared_ptr<const Message>;
+using message_ptr = std::shared_ptr<Message>;
 using message_callback = std::function<void(message_ptr message)>;
+using message_variant = std::variant<binary, string>;
+
+inline size_t message_size_func(const message_ptr &m) {
+	return m->type == Message::Binary || m->type == Message::String ? m->size() : 0;
+};
 
 template <typename Iterator>
 message_ptr make_message(Iterator begin, Iterator end, Message::Type type = Message::Binary,
                          unsigned int stream = 0,
                          std::shared_ptr<Reliability> reliability = nullptr) {
-	return std::make_shared<Message>(begin, end, type, stream, reliability);
+	auto message = std::make_shared<Message>(begin, end, type);
+	message->stream = stream;
+	message->reliability = reliability;
+	return message;
 }
 
+message_ptr make_message(size_t size, Message::Type type = Message::Binary, unsigned int stream = 0,
+                         std::shared_ptr<Reliability> reliability = nullptr);
+
+message_ptr make_message(binary &&data, Message::Type type = Message::Binary,
+                         unsigned int stream = 0,
+                         std::shared_ptr<Reliability> reliability = nullptr);
+
+message_ptr make_message(message_variant data);
+
+message_variant to_variant(Message &&message);
+
 } // namespace rtc
 
 #endif

include/rtc/peerconnection.hpp

@@ -20,75 +20,193 @@
 #define RTC_PEER_CONNECTION_H
 
 #include "candidate.hpp"
+#include "configuration.hpp"
 #include "datachannel.hpp"
 #include "description.hpp"
-#include "configuration.hpp"
 #include "include.hpp"
+#include "init.hpp"
 #include "message.hpp"
 #include "reliability.hpp"
+#include "rtc.hpp"
+#include "track.hpp"
 
 #include <atomic>
 #include <functional>
+#include <future>
+#include <list>
+#include <mutex>
+#include <shared_mutex>
+#include <thread>
 #include <unordered_map>
 
 namespace rtc {
 
 class Certificate;
+class Processor;
 class IceTransport;
 class DtlsTransport;
 class SctpTransport;
 
-class PeerConnection {
+using certificate_ptr = std::shared_ptr<Certificate>;
+using future_certificate_ptr = std::shared_future<certificate_ptr>;
+
+struct RTC_CPP_EXPORT DataChannelInit {
+	Reliability reliability = {};
+	bool negotiated = false;
+	std::optional<uint16_t> id = nullopt;
+	string protocol = "";
+};
+
+class RTC_CPP_EXPORT PeerConnection final : public std::enable_shared_from_this<PeerConnection> {
 public:
-	PeerConnection(void);
+	enum class State : int {
+		New = RTC_NEW,
+		Connecting = RTC_CONNECTING,
+		Connected = RTC_CONNECTED,
+		Disconnected = RTC_DISCONNECTED,
+		Failed = RTC_FAILED,
+		Closed = RTC_CLOSED
+	};
+
+	enum class GatheringState : int {
+		New = RTC_GATHERING_NEW,
+		InProgress = RTC_GATHERING_INPROGRESS,
+		Complete = RTC_GATHERING_COMPLETE
+	};
+
+	enum class SignalingState : int {
+		Stable = RTC_SIGNALING_STABLE,
+		HaveLocalOffer = RTC_SIGNALING_HAVE_LOCAL_OFFER,
+		HaveRemoteOffer = RTC_SIGNALING_HAVE_REMOTE_OFFER,
+		HaveLocalPranswer = RTC_SIGNALING_HAVE_LOCAL_PRANSWER,
+		HaveRemotePranswer = RTC_SIGNALING_HAVE_REMOTE_PRANSWER,
+	} rtcSignalingState;
+
+	PeerConnection();
 	PeerConnection(const Configuration &config);
 	~PeerConnection();
 
-	const Configuration *config() const;
+	void close();
 
+	const Configuration *config() const;
+	State state() const;
+	GatheringState gatheringState() const;
+	SignalingState signalingState() const;
+	bool hasLocalDescription() const;
+	bool hasRemoteDescription() const;
+	bool hasMedia() const;
 	std::optional<Description> localDescription() const;
 	std::optional<Description> remoteDescription() const;
+	std::optional<string> localAddress() const;
+	std::optional<string> remoteAddress() const;
+	bool getSelectedCandidatePair(Candidate *local, Candidate *remote);
+
+	void setLocalDescription(Description::Type type = Description::Type::Unspec);
 
 	void setRemoteDescription(Description description);
 	void addRemoteCandidate(Candidate candidate);
 
-	std::shared_ptr<DataChannel> createDataChannel(const string &label, const string &protocol = "",
+	std::shared_ptr<DataChannel> addDataChannel(string label, DataChannelInit init = {});
-	                                               const Reliability &reliability = {});
+
+	// Equivalent to calling addDataChannel() and setLocalDescription()
+	std::shared_ptr<DataChannel> createDataChannel(string label, DataChannelInit init = {});
 
 	void onDataChannel(std::function<void(std::shared_ptr<DataChannel> dataChannel)> callback);
-	void onLocalDescription(std::function<void(const Description &description)> callback);
+	void onLocalDescription(std::function<void(Description description)> callback);
-	void onLocalCandidate(std::function<void(const std::optional<Candidate> &candidate)> callback);
+	void onLocalCandidate(std::function<void(Candidate candidate)> callback);
+	void onStateChange(std::function<void(State state)> callback);
+	void onGatheringStateChange(std::function<void(GatheringState state)> callback);
+	void onSignalingStateChange(std::function<void(SignalingState state)> callback);
+
+	// Stats
+	void clearStats();
+	size_t bytesSent();
+	size_t bytesReceived();
+	std::optional<std::chrono::milliseconds> rtt();
+
+	// Track media support requires compiling with libSRTP
+	std::shared_ptr<Track> addTrack(Description::Media description);
+	void onTrack(std::function<void(std::shared_ptr<Track> track)> callback);
 
 private:
-	void initIceTransport(Description::Role role);
+	std::shared_ptr<IceTransport> initIceTransport();
-	void initDtlsTransport();
+	std::shared_ptr<DtlsTransport> initDtlsTransport();
-	void initSctpTransport();
+	std::shared_ptr<SctpTransport> initSctpTransport();
+	void closeTransports();
 
+	void endLocalCandidates();
 	bool checkFingerprint(const std::string &fingerprint) const;
 	void forwardMessage(message_ptr message);
-	void openDataChannels(void);
+	void forwardMedia(message_ptr message);
+	void forwardBufferedAmount(uint16_t stream, size_t amount);
+	std::optional<std::string> getMidFromSsrc(uint32_t ssrc);
 
+	std::shared_ptr<DataChannel> emplaceDataChannel(Description::Role role, string label,
+	                                                DataChannelInit init);
+	std::shared_ptr<DataChannel> findDataChannel(uint16_t stream);
+	void iterateDataChannels(std::function<void(std::shared_ptr<DataChannel> channel)> func);
+	void openDataChannels();
+	void closeDataChannels();
+	void remoteCloseDataChannels();
+
+	void incomingTrack(Description::Media description);
+	void openTracks();
+
+	void validateRemoteDescription(const Description &description);
 	void processLocalDescription(Description description);
-	void processLocalCandidate(std::optional<Candidate> candidate);
+	void processLocalCandidate(Candidate candidate);
-	void triggerDataChannel(std::shared_ptr<DataChannel> dataChannel);
+	void processRemoteDescription(Description description);
+	void processRemoteCandidate(Candidate candidate);
+	string localBundleMid() const;
 
+	void triggerDataChannel(std::weak_ptr<DataChannel> weakDataChannel);
+	void triggerTrack(std::shared_ptr<Track> track);
+	bool changeState(State state);
+	bool changeGatheringState(GatheringState state);
+	bool changeSignalingState(SignalingState state);
+
+	void resetCallbacks();
+
+	void outgoingMedia(message_ptr message);
+
+	const init_token mInitToken = Init::Token();
 	const Configuration mConfig;
-	const std::shared_ptr<Certificate> mCertificate;
+	const future_certificate_ptr mCertificate;
+	const std::unique_ptr<Processor> mProcessor;
 
-	std::optional<Description> mLocalDescription;
+	std::optional<Description> mLocalDescription, mRemoteDescription;
-	std::optional<Description> mRemoteDescription;
+	std::optional<Description> mCurrentLocalDescription;
+	mutable std::mutex mLocalDescriptionMutex, mRemoteDescriptionMutex;
 
 	std::shared_ptr<IceTransport> mIceTransport;
 	std::shared_ptr<DtlsTransport> mDtlsTransport;
 	std::shared_ptr<SctpTransport> mSctpTransport;
 
-	std::unordered_map<unsigned int, std::weak_ptr<DataChannel>> mDataChannels;
+	std::unordered_map<uint16_t, std::weak_ptr<DataChannel>> mDataChannels; // by stream ID
+	std::unordered_map<string, std::weak_ptr<Track>> mTracks;               // by mid
+	std::vector<std::weak_ptr<Track>> mTrackLines;                          // by SDP order
+	std::shared_mutex mDataChannelsMutex, mTracksMutex;
 
-	std::function<void(std::shared_ptr<DataChannel> dataChannel)> mDataChannelCallback;
+	std::unordered_map<uint32_t, string> mMidFromSsrc; // cache
-	std::function<void(const Description &description)> mLocalDescriptionCallback;
+
-	std::function<void(const std::optional<Candidate> &candidate)> mLocalCandidateCallback;
+	std::atomic<State> mState;
+	std::atomic<GatheringState> mGatheringState;
+	std::atomic<SignalingState> mSignalingState;
+	std::atomic<bool> mNegotiationNeeded;
+
+	synchronized_callback<std::shared_ptr<DataChannel>> mDataChannelCallback;
+	synchronized_callback<Description> mLocalDescriptionCallback;
+	synchronized_callback<Candidate> mLocalCandidateCallback;
+	synchronized_callback<State> mStateChangeCallback;
+	synchronized_callback<GatheringState> mGatheringStateChangeCallback;
+	synchronized_callback<SignalingState> mSignalingStateChangeCallback;
+	synchronized_callback<std::shared_ptr<Track>> mTrackCallback;
 };
 
 } // namespace rtc
 
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::State state);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::GatheringState state);
+RTC_CPP_EXPORT std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::SignalingState state);
+
 #endif

include/rtc/queue.hpp

@@ -0,0 +1,172 @@
+/**
+ * Copyright (c) 2019 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_QUEUE_H
+#define RTC_QUEUE_H
+
+#include "include.hpp"
+
+#include <atomic>
+#include <chrono>
+#include <condition_variable>
+#include <mutex>
+#include <optional>
+#include <queue>
+
+namespace rtc {
+
+template <typename T> class Queue {
+public:
+	using amount_function = std::function<size_t(const T &element)>;
+
+	Queue(size_t limit = 0, amount_function func = nullptr);
+	~Queue();
+
+	void stop();
+	bool running() const;
+	bool empty() const;
+	bool full() const;
+	size_t size() const;   // elements
+	size_t amount() const; // amount
+	void push(T element);
+	std::optional<T> pop();
+	std::optional<T> tryPop();
+	std::optional<T> peek();
+	std::optional<T> exchange(T element);
+	bool wait(const std::optional<std::chrono::milliseconds> &duration = nullopt);
+
+private:
+	void pushImpl(T element);
+	std::optional<T> popImpl();
+
+	const size_t mLimit;
+	size_t mAmount;
+	std::queue<T> mQueue;
+	std::condition_variable mPopCondition, mPushCondition;
+	amount_function mAmountFunction;
+	bool mStopping = false;
+
+	mutable std::mutex mMutex;
+};
+
+template <typename T>
+Queue<T>::Queue(size_t limit, amount_function func) : mLimit(limit), mAmount(0) {
+	mAmountFunction = func ? func : [](const T &element) -> size_t {
+		static_cast<void>(element);
+		return 1;
+	};
+}
+
+template <typename T> Queue<T>::~Queue() { stop(); }
+
+template <typename T> void Queue<T>::stop() {
+	std::lock_guard lock(mMutex);
+	mStopping = true;
+	mPopCondition.notify_all();
+	mPushCondition.notify_all();
+}
+
+template <typename T> bool Queue<T>::running() const {
+	std::lock_guard lock(mMutex);
+	return !mQueue.empty() || !mStopping;
+}
+
+template <typename T> bool Queue<T>::empty() const {
+	std::lock_guard lock(mMutex);
+	return mQueue.empty();
+}
+
+template <typename T> bool Queue<T>::full() const {
+	std::lock_guard lock(mMutex);
+	return mQueue.size() >= mLimit;
+}
+
+template <typename T> size_t Queue<T>::size() const {
+	std::lock_guard lock(mMutex);
+	return mQueue.size();
+}
+
+template <typename T> size_t Queue<T>::amount() const {
+	std::lock_guard lock(mMutex);
+	return mAmount;
+}
+
+template <typename T> void Queue<T>::push(T element) {
+	std::unique_lock lock(mMutex);
+	mPushCondition.wait(lock, [this]() { return !mLimit || mQueue.size() < mLimit || mStopping; });
+	pushImpl(std::move(element));
+}
+
+template <typename T> std::optional<T> Queue<T>::pop() {
+	std::unique_lock lock(mMutex);
+	mPopCondition.wait(lock, [this]() { return !mQueue.empty() || mStopping; });
+	return popImpl();
+}
+
+template <typename T> std::optional<T> Queue<T>::tryPop() {
+	std::unique_lock lock(mMutex);
+	return popImpl();
+}
+
+template <typename T> std::optional<T> Queue<T>::peek() {
+	std::unique_lock lock(mMutex);
+	return !mQueue.empty() ? std::make_optional(mQueue.front()) : nullopt;
+}
+
+template <typename T> std::optional<T> Queue<T>::exchange(T element) {
+	std::unique_lock lock(mMutex);
+	if (mQueue.empty())
+		return nullopt;
+
+	std::swap(mQueue.front(), element);
+	return std::make_optional(std::move(element));
+}
+
+template <typename T>
+bool Queue<T>::wait(const std::optional<std::chrono::milliseconds> &duration) {
+	std::unique_lock lock(mMutex);
+	if (duration)
+		mPopCondition.wait_for(lock, *duration, [this]() { return !mQueue.empty() || mStopping; });
+	else
+		mPopCondition.wait(lock, [this]() { return !mQueue.empty() || mStopping; });
+
+	return !mQueue.empty();
+}
+
+template <typename T> void Queue<T>::pushImpl(T element) {
+	if (mStopping)
+		return;
+
+	mAmount += mAmountFunction(element);
+	mQueue.emplace(std::move(element));
+	mPopCondition.notify_one();
+}
+
+template <typename T> std::optional<T> Queue<T>::popImpl() {
+	if (mQueue.empty())
+		return nullopt;
+
+	mAmount -= mAmountFunction(mQueue.front());
+	std::optional<T> element{std::move(mQueue.front())};
+	mQueue.pop();
+	return element;
+}
+
+} // namespace rtc
+
+#endif

include/rtc/reliability.hpp

@@ -27,13 +27,9 @@
 namespace rtc {
 
 struct Reliability {
-	enum Type : uint8_t {
+	enum class Type { Reliable = 0, Rexmit, Timed };
-		TYPE_RELIABLE = 0x00,
-		TYPE_PARTIAL_RELIABLE_REXMIT = 0x01,
-		TYPE_PARTIAL_RELIABLE_TIMED = 0x02,
-	};
 
-	Type type = TYPE_RELIABLE;
+	Type type = Type::Reliable;
 	bool unordered = false;
 	std::variant<int, std::chrono::milliseconds> rexmit = 0;
 };
@@ -41,4 +37,3 @@ struct Reliability {
 } // namespace rtc
 
 #endif
-

include/rtc/rtc.h

@@ -16,30 +16,198 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef RTC_C_API
+#define RTC_C_API
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-// libdatachannel rtc C API
+#ifdef _WIN32
-int rtcCreatePeerConnection(const char **iceServers, int iceServersCount);
+#define RTC_EXPORT __declspec(dllexport)
-void rtcDeletePeerConnection(int pc);
+#ifdef CAPI_STDCALL
-int rtcCreateDataChannel(int pc, const char *label);
+#define RTC_API __stdcall
-void rtcDeleteDataChannel(int dc);
+#else
-void rtcSetDataChannelCallback(int pc, void (*dataChannelCallback)(int, void *));
+#define RTC_API
-void rtcSetLocalDescriptionCallback(int pc, void (*descriptionCallback)(const char *, const char *,
+#endif
-                                                                        void *));
+#else // not WIN32
-void rtcSetLocalCandidateCallback(int pc,
+#define RTC_EXPORT
-                                  void (*candidateCallback)(const char *, const char *, void *));
+#define RTC_API
-void rtcSetRemoteDescription(int pc, const char *sdp, const char *type);
+#endif
-void rtcAddRemoteCandidate(int pc, const char *candidate, const char *mid);
+
-int rtcGetDataChannelLabel(int dc, char *data, int size);
+#ifndef RTC_ENABLE_WEBSOCKET
-void rtcSetOpenCallback(int dc, void (*openCallback)(void *));
+#define RTC_ENABLE_WEBSOCKET 1
-void rtcSetErrorCallback(int dc, void (*errorCallback)(const char *, void *));
+#endif
-void rtcSetMessageCallback(int dc, void (*messageCallback)(const char *, int, void *));
+
-int rtcSendMessage(int dc, const char *data, int size);
+#include <stdbool.h>
-void rtcSetUserPointer(int i, void *ptr);
+#include <stdint.h>
+
+// libdatachannel C API
+
+typedef enum {
+	RTC_NEW = 0,
+	RTC_CONNECTING = 1,
+	RTC_CONNECTED = 2,
+	RTC_DISCONNECTED = 3,
+	RTC_FAILED = 4,
+	RTC_CLOSED = 5
+} rtcState;
+
+typedef enum {
+	RTC_GATHERING_NEW = 0,
+	RTC_GATHERING_INPROGRESS = 1,
+	RTC_GATHERING_COMPLETE = 2
+} rtcGatheringState;
+
+typedef enum {
+	RTC_SIGNALING_STABLE = 0,
+	RTC_SIGNALING_HAVE_LOCAL_OFFER = 1,
+	RTC_SIGNALING_HAVE_REMOTE_OFFER = 2,
+	RTC_SIGNALING_HAVE_LOCAL_PRANSWER = 3,
+	RTC_SIGNALING_HAVE_REMOTE_PRANSWER = 4,
+} rtcSignalingState;
+
+typedef enum { // Don't change, it must match plog severity
+	RTC_LOG_NONE = 0,
+	RTC_LOG_FATAL = 1,
+	RTC_LOG_ERROR = 2,
+	RTC_LOG_WARNING = 3,
+	RTC_LOG_INFO = 4,
+	RTC_LOG_DEBUG = 5,
+	RTC_LOG_VERBOSE = 6
+} rtcLogLevel;
+
+#define RTC_ERR_SUCCESS 0
+#define RTC_ERR_INVALID -1   // invalid argument
+#define RTC_ERR_FAILURE -2   // runtime error
+#define RTC_ERR_NOT_AVAIL -3 // element not available
+#define RTC_ERR_TOO_SMALL -4 // buffer too small
+
+typedef struct {
+	const char **iceServers;
+	int iceServersCount;
+	uint16_t portRangeBegin;
+	uint16_t portRangeEnd;
+} rtcConfiguration;
+
+typedef struct {
+	bool unordered;
+	bool unreliable;
+	unsigned int maxPacketLifeTime; // ignored if reliable
+	unsigned int maxRetransmits;    // ignored if reliable
+} rtcReliability;
+
+typedef struct {
+	rtcReliability reliability;
+	const char *protocol; // empty string if NULL
+	bool negotiated;
+	bool manualStream;
+	uint16_t stream; // numeric ID 0-65534, ignored if manualStream is false
+} rtcDataChannelInit;
+
+typedef void(RTC_API *rtcLogCallbackFunc)(rtcLogLevel level, const char *message);
+typedef void(RTC_API *rtcDescriptionCallbackFunc)(int pc, const char *sdp, const char *type,
+                                                  void *ptr);
+typedef void(RTC_API *rtcCandidateCallbackFunc)(int pc, const char *cand, const char *mid,
+                                                void *ptr);
+typedef void(RTC_API *rtcStateChangeCallbackFunc)(int pc, rtcState state, void *ptr);
+typedef void(RTC_API *rtcGatheringStateCallbackFunc)(int pc, rtcGatheringState state, void *ptr);
+typedef void(RTC_API *rtcSignalingStateCallbackFunc)(int pc, rtcSignalingState state, void *ptr);
+typedef void(RTC_API *rtcDataChannelCallbackFunc)(int pc, int dc, void *ptr);
+typedef void(RTC_API *rtcTrackCallbackFunc)(int pc, int tr, void *ptr);
+typedef void(RTC_API *rtcOpenCallbackFunc)(int id, void *ptr);
+typedef void(RTC_API *rtcClosedCallbackFunc)(int id, void *ptr);
+typedef void(RTC_API *rtcErrorCallbackFunc)(int id, const char *error, void *ptr);
+typedef void(RTC_API *rtcMessageCallbackFunc)(int id, const char *message, int size, void *ptr);
+typedef void(RTC_API *rtcBufferedAmountLowCallbackFunc)(int id, void *ptr);
+typedef void(RTC_API *rtcAvailableCallbackFunc)(int id, void *ptr);
+
+// Log
+// NULL cb on the first call will log to stdout
+RTC_EXPORT void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb);
+
+// User pointer
+RTC_EXPORT void rtcSetUserPointer(int id, void *ptr);
+
+// PeerConnection
+RTC_EXPORT int rtcCreatePeerConnection(const rtcConfiguration *config); // returns pc id
+RTC_EXPORT int rtcDeletePeerConnection(int pc);
+
+RTC_EXPORT int rtcSetLocalDescriptionCallback(int pc, rtcDescriptionCallbackFunc cb);
+RTC_EXPORT int rtcSetLocalCandidateCallback(int pc, rtcCandidateCallbackFunc cb);
+RTC_EXPORT int rtcSetStateChangeCallback(int pc, rtcStateChangeCallbackFunc cb);
+RTC_EXPORT int rtcSetGatheringStateChangeCallback(int pc, rtcGatheringStateCallbackFunc cb);
+RTC_EXPORT int rtcSetSignalingStateChangeCallback(int pc, rtcSignalingStateCallbackFunc cb);
+
+RTC_EXPORT int rtcSetLocalDescription(int pc, const char *type);
+RTC_EXPORT int rtcSetRemoteDescription(int pc, const char *sdp, const char *type);
+RTC_EXPORT int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid);
+
+RTC_EXPORT int rtcGetLocalDescription(int pc, char *buffer, int size);
+RTC_EXPORT int rtcGetRemoteDescription(int pc, char *buffer, int size);
+
+RTC_EXPORT int rtcGetLocalAddress(int pc, char *buffer, int size);
+RTC_EXPORT int rtcGetRemoteAddress(int pc, char *buffer, int size);
+
+RTC_EXPORT int rtcGetSelectedCandidatePair(int pc, char *local, int localSize, char *remote,
+                                           int remoteSize);
+
+// DataChannel
+RTC_EXPORT int rtcSetDataChannelCallback(int pc, rtcDataChannelCallbackFunc cb);
+RTC_EXPORT int rtcAddDataChannel(int pc, const char *label); // returns dc id
+RTC_EXPORT int rtcAddDataChannelEx(int pc, const char *label,
+                                   const rtcDataChannelInit *init); // returns dc id
+// Equivalent to calling rtcAddDataChannel() and rtcSetLocalDescription()
+RTC_EXPORT int rtcCreateDataChannel(int pc, const char *label); // returns dc id
+RTC_EXPORT int rtcCreateDataChannelEx(int pc, const char *label,
+                                      const rtcDataChannelInit *init); // returns dc id
+RTC_EXPORT int rtcDeleteDataChannel(int dc);
+
+RTC_EXPORT int rtcGetDataChannelStream(int dc);
+RTC_EXPORT int rtcGetDataChannelLabel(int dc, char *buffer, int size);
+RTC_EXPORT int rtcGetDataChannelProtocol(int dc, char *buffer, int size);
+RTC_EXPORT int rtcGetDataChannelReliability(int dc, rtcReliability *reliability);
+
+// Track
+RTC_EXPORT int rtcSetTrackCallback(int pc, rtcTrackCallbackFunc cb);
+RTC_EXPORT int rtcAddTrack(int pc, const char *mediaDescriptionSdp); // returns tr id
+RTC_EXPORT int rtcDeleteTrack(int tr);
+
+RTC_EXPORT int rtcGetTrackDescription(int tr, char *buffer, int size);
+
+// WebSocket
+#if RTC_ENABLE_WEBSOCKET
+typedef struct {
+	bool disableTlsVerification; // if true, don't verify the TLS certificate
+} rtcWsConfiguration;
+
+RTC_EXPORT int rtcCreateWebSocket(const char *url); // returns ws id
+RTC_EXPORT int rtcCreateWebSocketEx(const char *url, const rtcWsConfiguration *config);
+RTC_EXPORT int rtcDeleteWebsocket(int ws);
+#endif
+
+// DataChannel, Track, and WebSocket common API
+RTC_EXPORT int rtcSetOpenCallback(int id, rtcOpenCallbackFunc cb);
+RTC_EXPORT int rtcSetClosedCallback(int id, rtcClosedCallbackFunc cb);
+RTC_EXPORT int rtcSetErrorCallback(int id, rtcErrorCallbackFunc cb);
+RTC_EXPORT int rtcSetMessageCallback(int id, rtcMessageCallbackFunc cb);
+RTC_EXPORT int rtcSendMessage(int id, const char *data, int size);
+
+RTC_EXPORT int rtcGetBufferedAmount(int id); // total size buffered to send
+RTC_EXPORT int rtcSetBufferedAmountLowThreshold(int id, int amount);
+RTC_EXPORT int rtcSetBufferedAmountLowCallback(int id, rtcBufferedAmountLowCallbackFunc cb);
+
+// DataChannel, Track, and WebSocket common extended API
+RTC_EXPORT int rtcGetAvailableAmount(int id); // total size available to receive
+RTC_EXPORT int rtcSetAvailableCallback(int id, rtcAvailableCallbackFunc cb);
+RTC_EXPORT int rtcReceiveMessage(int id, char *buffer, int *size);
+
+// Optional preload and cleanup
+RTC_EXPORT void rtcPreload(void);
+RTC_EXPORT void rtcCleanup(void);
 
 #ifdef __cplusplus
 } // extern "C"
 #endif
 
+#endif

include/rtc/rtc.hpp

@@ -17,9 +17,13 @@
  */
 
 // C++ API
+#include "include.hpp"
+#include "init.hpp" // for rtc::Cleanup()
+#include "log.hpp"
+//
 #include "datachannel.hpp"
 #include "peerconnection.hpp"
+#include "websocket.hpp"
 
 // C API
 #include "rtc.h"
-

include/rtc/rtcp.hpp

@@ -0,0 +1,91 @@
+/**
+ * Copyright (c) 2020 Staz Modrzynski
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_RTCP_H
+#define RTC_RTCP_H
+
+#include <utility>
+
+#include "include.hpp"
+#include "log.hpp"
+#include "message.hpp"
+#include "rtp.hpp"
+
+namespace rtc {
+
+class RTC_CPP_EXPORT RtcpHandler {
+protected:
+	/**
+	 * Use this callback when trying to send custom data (such as RTCP) to the client.
+	 */
+	synchronized_callback<rtc::message_ptr> outgoingCallback;
+
+public:
+	/**
+	 * Called when there is traffic coming from the peer
+	 * @param ptr
+	 * @return
+	 */
+	virtual rtc::message_ptr incoming(rtc::message_ptr ptr) = 0;
+
+	/**
+	 * Called when there is traffic that needs to be sent to the peer
+	 * @param ptr
+	 * @return
+	 */
+	virtual rtc::message_ptr outgoing(rtc::message_ptr ptr) = 0;
+
+	/**
+	 * This callback is used to send traffic back to the peer.
+	 * This callback skips calling the track's methods.
+	 * @param cb
+	 */
+	void onOutgoing(const std::function<void(rtc::message_ptr)> &cb);
+
+	virtual bool requestKeyframe() { return false; }
+};
+
+class Track;
+
+// An RtcpSession can be plugged into a Track to handle the whole RTCP session
+class RTC_CPP_EXPORT RtcpReceivingSession : public RtcpHandler {
+public:
+	rtc::message_ptr incoming(rtc::message_ptr ptr) override;
+	rtc::message_ptr outgoing(rtc::message_ptr ptr) override;
+	bool send(rtc::message_ptr ptr);
+
+	void requestBitrate(unsigned int newBitrate);
+
+	bool requestKeyframe() override;
+
+protected:
+	void pushREMB(unsigned int bitrate);
+	void pushRR(unsigned int lastSR_delay);
+
+	void pushPLI();
+
+	unsigned int mRequestedBitrate = 0;
+	SSRC mSsrc = 0;
+	uint32_t mGreatestSeqNo = 0;
+	uint64_t mSyncRTPTS, mSyncNTPTS;
+};
+
+} // namespace rtc
+
+#endif // RTC_RTCP_H

include/rtc/rtp.hpp

@@ -0,0 +1,517 @@
+/**
+ * Copyright (c) 2020 Staz Modrzynski
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_RTP_HPP
+#define RTC_RTP_HPP
+
+#include "log.hpp"
+
+#include <cmath>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+#ifndef htonll
+#define htonll(x)                                                                                  \
+	((uint64_t)htonl(((uint64_t)(x)&0xFFFFFFFF) << 32) | (uint64_t)htonl((uint64_t)(x) >> 32))
+#endif
+#ifndef ntohll
+#define ntohll(x) htonll(x)
+#endif
+
+namespace rtc {
+
+typedef uint32_t SSRC;
+
+#pragma pack(push, 1)
+
+struct RTP {
+private:
+	uint8_t _first;
+	uint8_t _payloadType;
+	uint16_t _seqNumber;
+	uint32_t _timestamp;
+	SSRC _ssrc;
+
+public:
+	SSRC csrc[16];
+
+	inline uint8_t version() const { return _first >> 6; }
+	inline bool padding() const { return (_first >> 5) & 0x01; }
+	inline bool extension() const { return (_first >> 4) & 0x01; }
+	inline uint8_t csrcCount() const { return _first & 0x0F; }
+	inline uint8_t marker() const { return _payloadType & 0b10000000; }
+	inline uint8_t payloadType() const { return _payloadType & 0b01111111; }
+	inline uint16_t seqNumber() const { return ntohs(_seqNumber); }
+	inline uint32_t timestamp() const { return ntohl(_timestamp); }
+	inline uint32_t ssrc() const { return ntohl(_ssrc); }
+
+	inline size_t getSize() const {
+		return reinterpret_cast<const char *>(&csrc) - reinterpret_cast<const char *>(this) +
+		       sizeof(SSRC) * csrcCount();
+	}
+
+	[[nodiscard]] char *getBody() {
+		return reinterpret_cast<char *>(&csrc) + sizeof(SSRC) * csrcCount();
+	}
+
+	[[nodiscard]] const char *getBody() const {
+		return reinterpret_cast<const char *>(&csrc) + sizeof(SSRC) * csrcCount();
+	}
+
+	inline void setSeqNumber(uint16_t newSeqNo) { _seqNumber = htons(newSeqNo); }
+	inline void setPayloadType(uint8_t newPayloadType) {
+		_payloadType = (_payloadType & 0b10000000u) | (0b01111111u & newPayloadType);
+	}
+	inline void setSsrc(uint32_t in_ssrc) { _ssrc = htonl(in_ssrc); }
+
+	void setTimestamp(uint32_t i) { _timestamp = htonl(i); }
+
+	void log() {
+		PLOG_VERBOSE << "RTP V: " << (int)version() << " P: " << (padding() ? "P" : " ")
+		             << " X: " << (extension() ? "X" : " ") << " CC: " << (int)csrcCount()
+		             << " M: " << (marker() ? "M" : " ") << " PT: " << (int)payloadType()
+		             << " SEQNO: " << seqNumber() << " TS: " << timestamp();
+	}
+};
+
+struct RTCP_ReportBlock {
+	SSRC ssrc;
+
+private:
+	uint32_t _fractionLostAndPacketsLost; // fraction lost is 8-bit, packets lost is 24-bit
+	uint16_t _seqNoCycles;
+	uint16_t _highestSeqNo;
+	uint32_t _jitter;
+	uint32_t _lastReport;
+	uint32_t _delaySinceLastReport;
+
+public:
+	inline void preparePacket(SSRC in_ssrc, [[maybe_unused]] unsigned int packetsLost,
+	                          [[maybe_unused]] unsigned int totalPackets, uint16_t highestSeqNo,
+	                          uint16_t seqNoCycles, uint32_t jitter, uint64_t lastSR_NTP,
+	                          uint64_t lastSR_DELAY) {
+		setSeqNo(highestSeqNo, seqNoCycles);
+		setJitter(jitter);
+		setSSRC(in_ssrc);
+
+		// Middle 32 bits of NTP Timestamp
+		//		  this->lastReport = lastSR_NTP >> 16u;
+		setNTPOfSR(uint64_t(lastSR_NTP));
+		setDelaySinceSR(uint32_t(lastSR_DELAY));
+
+		// The delay, expressed in units of 1/65536 seconds
+		// this->delaySinceLastReport = lastSR_DELAY;
+	}
+
+	inline void setSSRC(SSRC in_ssrc) { this->ssrc = htonl(in_ssrc); }
+	[[nodiscard]] inline SSRC getSSRC() const { return ntohl(ssrc); }
+
+	inline void setPacketsLost([[maybe_unused]] unsigned int packetsLost,
+	                           [[maybe_unused]] unsigned int totalPackets) {
+		// TODO Implement loss percentages.
+		_fractionLostAndPacketsLost = 0;
+	}
+
+	[[nodiscard]] inline unsigned int getLossPercentage() const {
+		// TODO Implement loss percentages.
+		return 0;
+	}
+	[[nodiscard]] inline unsigned int getPacketLostCount() const {
+		// TODO Implement total packets lost.
+		return 0;
+	}
+
+	inline uint16_t seqNoCycles() const { return ntohs(_seqNoCycles); }
+	inline uint16_t highestSeqNo() const { return ntohs(_highestSeqNo); }
+	inline uint32_t jitter() const { return ntohl(_jitter); }
+
+	inline void setSeqNo(uint16_t highestSeqNo, uint16_t seqNoCycles) {
+		_highestSeqNo = htons(highestSeqNo);
+		_seqNoCycles = htons(seqNoCycles);
+	}
+
+	inline void setJitter(uint32_t jitter) { _jitter = htonl(jitter); }
+
+	inline void setNTPOfSR(uint64_t ntp) { _lastReport = htonll(ntp >> 16u); }
+	[[nodiscard]] inline uint32_t getNTPOfSR() const { return ntohl(_lastReport) << 16u; }
+
+	inline void setDelaySinceSR(uint32_t sr) {
+		// The delay, expressed in units of 1/65536 seconds
+		_delaySinceLastReport = htonl(sr);
+	}
+	[[nodiscard]] inline uint32_t getDelaySinceSR() const { return ntohl(_delaySinceLastReport); }
+
+	inline void log() const {
+		PLOG_VERBOSE << "RTCP report block: "
+		             << "ssrc="
+		             << ntohl(ssrc)
+		             // TODO: Implement these reports
+		             //	<< ", fractionLost=" << fractionLost
+		             //	<< ", packetsLost=" << packetsLost
+		             << ", highestSeqNo=" << highestSeqNo() << ", seqNoCycles=" << seqNoCycles()
+		             << ", jitter=" << jitter() << ", lastSR=" << getNTPOfSR()
+		             << ", lastSRDelay=" << getDelaySinceSR();
+	}
+};
+
+struct RTCP_HEADER {
+private:
+	uint8_t _first;
+	uint8_t _payloadType;
+	uint16_t _length;
+
+public:
+	inline uint8_t version() const { return _first >> 6; }
+	inline bool padding() const { return (_first >> 5) & 0x01; }
+	inline uint8_t reportCount() const { return _first & 0x0F; }
+	inline uint8_t payloadType() const { return _payloadType; }
+	inline uint16_t length() const { return ntohs(_length); }
+	inline size_t lengthInBytes() const { return (1 + length()) * 4; }
+
+	inline void setPayloadType(uint8_t type) { _payloadType = type; }
+	inline void setReportCount(uint8_t count) {
+		_first = (_first & 0b11100000u) | (count & 0b00011111u);
+	}
+	inline void setLength(uint16_t length) { _length = htons(length); }
+
+	inline void prepareHeader(uint8_t payloadType, uint8_t reportCount, uint16_t length) {
+		_first = 0b10000000; // version 2, no padding
+		setReportCount(reportCount);
+		setPayloadType(payloadType);
+		setLength(length);
+	}
+
+	inline void log() const {
+		PLOG_VERBOSE << "RTCP header: "
+		             << "version=" << unsigned(version()) << ", padding=" << padding()
+		             << ", reportCount=" << unsigned(reportCount())
+		             << ", payloadType=" << unsigned(payloadType()) << ", length=" << length();
+	}
+};
+
+struct RTCP_FB_HEADER {
+	RTCP_HEADER header;
+	SSRC packetSender;
+	SSRC mediaSource;
+
+	[[nodiscard]] SSRC getPacketSenderSSRC() const { return ntohl(packetSender); }
+
+	[[nodiscard]] SSRC getMediaSourceSSRC() const { return ntohl(mediaSource); }
+
+	void setPacketSenderSSRC(SSRC ssrc) { this->packetSender = htonl(ssrc); }
+
+	void setMediaSourceSSRC(SSRC ssrc) { this->mediaSource = htonl(ssrc); }
+
+	void log() {
+		header.log();
+		PLOG_VERBOSE << "FB: "
+		             << " packet sender: " << getPacketSenderSSRC()
+		             << " media source: " << getMediaSourceSSRC();
+	}
+};
+
+struct RTCP_SR {
+	RTCP_HEADER header;
+	SSRC _senderSSRC;
+
+private:
+	uint64_t _ntpTimestamp;
+	uint32_t _rtpTimestamp;
+	uint32_t _packetCount;
+	uint32_t _octetCount;
+
+	RTCP_ReportBlock _reportBlocks;
+
+public:
+	inline void preparePacket(SSRC senderSSRC, uint8_t reportCount) {
+		unsigned int length =
+		    ((sizeof(header) + 24 + reportCount * sizeof(RTCP_ReportBlock)) / 4) - 1;
+		header.prepareHeader(200, reportCount, uint16_t(length));
+		this->_senderSSRC = htonl(senderSSRC);
+	}
+
+	[[nodiscard]] inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
+	[[nodiscard]] inline const RTCP_ReportBlock *getReportBlock(int num) const {
+		return &_reportBlocks + num;
+	}
+
+	[[nodiscard]] inline size_t getSize() const {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		return sizeof(uint32_t) * (1 + size_t(header.length()));
+	}
+
+	inline uint64_t ntpTimestamp() const { return ntohll(_ntpTimestamp); }
+	inline uint32_t rtpTimestamp() const { return ntohl(_rtpTimestamp); }
+	inline uint32_t packetCount() const { return ntohl(_packetCount); }
+	inline uint32_t octetCount() const { return ntohl(_octetCount); }
+	inline uint32_t senderSSRC() const { return ntohl(_senderSSRC); }
+
+	inline void setNtpTimestamp(uint32_t ts) { _ntpTimestamp = htonll(ts); }
+	inline void setRtpTimestamp(uint32_t ts) { _rtpTimestamp = htonl(ts); }
+
+	inline void log() const {
+		header.log();
+		PLOG_VERBOSE << "RTCP SR: "
+		             << " SSRC=" << senderSSRC() << ", NTP_TS=" << ntpTimestamp()
+		             << ", RTP_TS=" << rtpTimestamp() << ", packetCount=" << packetCount()
+		             << ", octetCount=" << octetCount();
+
+		for (unsigned i = 0; i < unsigned(header.reportCount()); i++) {
+			getReportBlock(i)->log();
+		}
+	}
+};
+
+struct RTCP_RR {
+	RTCP_HEADER header;
+	SSRC _senderSSRC;
+
+private:
+	RTCP_ReportBlock _reportBlocks;
+
+public:
+	[[nodiscard]] inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
+	[[nodiscard]] inline const RTCP_ReportBlock *getReportBlock(int num) const {
+		return &_reportBlocks + num;
+	}
+
+	inline SSRC senderSSRC() const { return ntohl(_senderSSRC); }
+	inline void setSenderSSRC(SSRC ssrc) { this->_senderSSRC = htonl(ssrc); }
+
+	[[nodiscard]] inline size_t getSize() const {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		return sizeof(uint32_t) * (1 + size_t(header.length()));
+	}
+
+	inline void preparePacket(SSRC senderSSRC, uint8_t reportCount) {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		size_t length = (sizeWithReportBlocks(reportCount) / 4) - 1;
+		header.prepareHeader(201, reportCount, uint16_t(length));
+		this->_senderSSRC = htonl(senderSSRC);
+	}
+
+	inline static size_t sizeWithReportBlocks(uint8_t reportCount) {
+		return sizeof(header) + 4 + size_t(reportCount) * sizeof(RTCP_ReportBlock);
+	}
+
+	inline bool isSenderReport() { return header.payloadType() == 200; }
+
+	inline bool isReceiverReport() { return header.payloadType() == 201; }
+
+	inline void log() const {
+		header.log();
+		PLOG_VERBOSE << "RTCP RR: "
+		             << " SSRC=" << ntohl(_senderSSRC);
+
+		for (unsigned i = 0; i < unsigned(header.reportCount()); i++) {
+			getReportBlock(i)->log();
+		}
+	}
+};
+
+struct RTCP_REMB {
+	RTCP_FB_HEADER header;
+
+	/*! \brief Unique identifier ('R' 'E' 'M' 'B') */
+	char id[4];
+
+	/*! \brief Num SSRC, Br Exp, Br Mantissa (bit mask) */
+	uint32_t bitrate;
+
+	SSRC ssrc[1];
+
+	[[nodiscard]] unsigned int getSize() const {
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		return sizeof(uint32_t) * (1 + header.header.length());
+	}
+
+	void preparePacket(SSRC senderSSRC, unsigned int numSSRC, unsigned int in_bitrate) {
+
+		// Report Count becomes the format here.
+		header.header.prepareHeader(206, 15, 0);
+
+		// Always zero.
+		header.setMediaSourceSSRC(0);
+
+		header.setPacketSenderSSRC(senderSSRC);
+
+		id[0] = 'R';
+		id[1] = 'E';
+		id[2] = 'M';
+		id[3] = 'B';
+
+		setBitrate(numSSRC, in_bitrate);
+	}
+
+	void setBitrate(unsigned int numSSRC, unsigned int in_bitrate) {
+		unsigned int exp = 0;
+		while (in_bitrate > pow(2, 18) - 1) {
+			exp++;
+			in_bitrate /= 2;
+		}
+
+		// "length" in packet is one less than the number of 32 bit words in the packet.
+		header.header.setLength(
+		    uint16_t((offsetof(RTCP_REMB, ssrc) / sizeof(uint32_t)) - 1 + numSSRC));
+
+		this->bitrate = htonl((numSSRC << (32u - 8u)) | (exp << (32u - 8u - 6u)) | in_bitrate);
+	}
+
+	void setSsrc(int iterator, SSRC newSssrc) { ssrc[iterator] = htonl(newSssrc); }
+
+	size_t static inline sizeWithSSRCs(int count) {
+		return sizeof(RTCP_REMB) + (count - 1) * sizeof(SSRC);
+	}
+};
+
+struct RTCP_PLI {
+	RTCP_FB_HEADER header;
+
+	void preparePacket(SSRC messageSSRC) {
+		header.header.prepareHeader(206, 1, 2);
+		header.setPacketSenderSSRC(messageSSRC);
+		header.setMediaSourceSSRC(messageSSRC);
+	}
+
+	void print() { header.log(); }
+
+	[[nodiscard]] static unsigned int size() { return sizeof(RTCP_FB_HEADER); }
+};
+
+struct RTCP_FIR_PART {
+	uint32_t ssrc;
+	uint8_t seqNo;
+	uint8_t dummy1;
+	uint16_t dummy2;
+};
+
+struct RTCP_FIR {
+	RTCP_FB_HEADER header;
+	RTCP_FIR_PART parts[1];
+
+	void preparePacket(SSRC messageSSRC, uint8_t seqNo) {
+		header.header.prepareHeader(206, 4, 2 + 2 * 1);
+		header.setPacketSenderSSRC(messageSSRC);
+		header.setMediaSourceSSRC(messageSSRC);
+		parts[0].ssrc = htonl(messageSSRC);
+		parts[0].seqNo = seqNo;
+	}
+
+	void print() { header.log(); }
+
+	[[nodiscard]] static unsigned int size() {
+		return sizeof(RTCP_FB_HEADER) + sizeof(RTCP_FIR_PART);
+	}
+};
+
+struct RTCP_NACK_PART {
+	uint16_t pid;
+	uint16_t blp;
+};
+
+class RTCP_NACK {
+public:
+	RTCP_FB_HEADER header;
+	RTCP_NACK_PART parts[1];
+
+public:
+	void preparePacket(SSRC ssrc, unsigned int discreteSeqNoCount) {
+		header.header.prepareHeader(205, 1, 2 + uint16_t(discreteSeqNoCount));
+		header.setMediaSourceSSRC(ssrc);
+		header.setPacketSenderSSRC(ssrc);
+	}
+
+	/**
+	 * Add a packet to the list of missing packets.
+	 * @param fciCount The number of FCI fields that are present in this packet.
+	 *                  Let the number start at zero and let this function grow the number.
+	 * @param fciPID The seq no of the active FCI. It will be initialized automatically, and will
+	 * change automatically.
+	 * @param missingPacket The seq no of the missing packet. This will be added to the queue.
+	 * @return true if the packet has grown, false otherwise.
+	 */
+	bool addMissingPacket(unsigned int *fciCount, uint16_t *fciPID, const uint16_t &missingPacket) {
+		if (*fciCount == 0 || missingPacket < *fciPID || missingPacket > (*fciPID + 16)) {
+			parts[*fciCount].pid = htons(missingPacket);
+			parts[*fciCount].blp = 0;
+			*fciPID = missingPacket;
+			(*fciCount)++;
+			return true;
+		} else {
+			// TODO SPEEED!
+			parts[(*fciCount) - 1].blp = htons(ntohs(parts[(*fciCount) - 1].blp) |
+			                                   (1u << (unsigned int)(missingPacket - *fciPID)));
+			return false;
+		}
+	}
+
+	[[nodiscard]] static unsigned int getSize(unsigned int discreteSeqNoCount) {
+		return offsetof(RTCP_NACK, parts) + sizeof(RTCP_NACK_PART) * discreteSeqNoCount;
+	}
+
+	[[nodiscard]] unsigned int getSeqNoCount() { return header.header.length() - 2; }
+};
+
+class RTP_RTX {
+private:
+	RTP header;
+
+public:
+	size_t copyTo(RTP *dest, size_t totalSize, uint8_t originalPayloadType) {
+		memmove((char *)dest, (char *)this, header.getSize());
+		dest->setSeqNumber(getOriginalSeqNo());
+		dest->setPayloadType(originalPayloadType);
+		memmove(dest->getBody(), getBody(), getBodySize(totalSize));
+		return totalSize;
+	}
+
+	[[nodiscard]] uint16_t getOriginalSeqNo() const {
+		return ntohs(*(uint16_t *)(header.getBody()));
+	}
+
+	[[nodiscard]] char *getBody() { return header.getBody() + sizeof(uint16_t); }
+
+	[[nodiscard]] const char *getBody() const { return header.getBody() + sizeof(uint16_t); }
+
+	[[nodiscard]] size_t getBodySize(size_t totalSize) {
+		return totalSize - (getBody() - reinterpret_cast<char *>(this));
+	}
+
+	[[nodiscard]] RTP &getHeader() { return header; }
+
+	size_t normalizePacket(size_t totalSize, SSRC originalSSRC, uint8_t originalPayloadType) {
+		header.setSeqNumber(getOriginalSeqNo());
+		header.setSsrc(originalSSRC);
+		header.setPayloadType(originalPayloadType);
+		// TODO, the -12 is the size of the header (which is variable!)
+		memmove(header.getBody(), header.getBody() + sizeof(uint16_t),
+		        totalSize - 12 - sizeof(uint16_t));
+		return totalSize - sizeof(uint16_t);
+	}
+};
+
+#pragma pack(pop)
+
+}; // namespace rtc
+
+#endif

include/rtc/track.hpp

@@ -0,0 +1,87 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_TRACK_H
+#define RTC_TRACK_H
+
+#include "channel.hpp"
+#include "description.hpp"
+#include "include.hpp"
+#include "message.hpp"
+#include "queue.hpp"
+#include "rtcp.hpp"
+
+#include <atomic>
+#include <variant>
+
+namespace rtc {
+
+#if RTC_ENABLE_MEDIA
+class DtlsSrtpTransport;
+#endif
+
+class RTC_CPP_EXPORT Track final : public std::enable_shared_from_this<Track>, public Channel {
+public:
+	Track(Description::Media description);
+	~Track() = default;
+
+	string mid() const;
+	Description::Media description() const;
+
+	void setDescription(Description::Media description);
+
+	void close(void) override;
+	bool send(message_variant data) override;
+	bool send(const byte *data, size_t size) override;
+
+	bool isOpen(void) const override;
+	bool isClosed(void) const override;
+	size_t maxMessageSize() const override;
+
+	// Extended API
+	size_t availableAmount() const override;
+	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
+
+	bool requestKeyframe();
+
+	// RTCP handler
+	void setRtcpHandler(std::shared_ptr<RtcpHandler> handler);
+	std::shared_ptr<RtcpHandler> getRtcpHandler();
+
+private:
+#if RTC_ENABLE_MEDIA
+	void open(std::shared_ptr<DtlsSrtpTransport> transport);
+	std::weak_ptr<DtlsSrtpTransport> mDtlsSrtpTransport;
+#endif
+
+	void incoming(message_ptr message);
+	bool outgoing(message_ptr message);
+
+	Description::Media mMediaDescription;
+	std::atomic<bool> mIsClosed = false;
+
+	Queue<message_ptr> mRecvQueue;
+	std::shared_ptr<RtcpHandler> mRtcpHandler;
+
+	friend class PeerConnection;
+};
+
+} // namespace rtc
+
+#endif

include/rtc/websocket.hpp

@@ -0,0 +1,102 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_WEBSOCKET_H
+#define RTC_WEBSOCKET_H
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "channel.hpp"
+#include "include.hpp"
+#include "init.hpp"
+#include "message.hpp"
+#include "queue.hpp"
+
+#include <atomic>
+#include <optional>
+#include <thread>
+#include <variant>
+
+namespace rtc {
+
+class TcpTransport;
+class TlsTransport;
+class WsTransport;
+
+class RTC_CPP_EXPORT WebSocket final : public Channel, public std::enable_shared_from_this<WebSocket> {
+public:
+	enum class State : int {
+		Connecting = 0,
+		Open = 1,
+		Closing = 2,
+		Closed = 3,
+	};
+
+	struct Configuration {
+		bool disableTlsVerification = false; // if true, don't verify the TLS certificate
+		std::vector<string> protocols;
+	};
+
+	WebSocket(std::optional<Configuration> config = nullopt);
+	~WebSocket();
+
+	State readyState() const;
+
+	void open(const string &url);
+	void close() override;
+	bool send(const message_variant data) override;
+	bool send(const byte *data, size_t size) override;
+
+	bool isOpen() const override;
+	bool isClosed() const override;
+	size_t maxMessageSize() const override;
+
+	// Extended API
+	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
+	size_t availableAmount() const override; // total size available to receive
+
+private:
+	bool changeState(State state);
+	void remoteClose();
+	bool outgoing(message_ptr message);
+	void incoming(message_ptr message);
+
+	std::shared_ptr<TcpTransport> initTcpTransport();
+	std::shared_ptr<TlsTransport> initTlsTransport();
+	std::shared_ptr<WsTransport> initWsTransport();
+	void closeTransports();
+
+	init_token mInitToken = Init::Token();
+
+	std::shared_ptr<TcpTransport> mTcpTransport;
+	std::shared_ptr<TlsTransport> mTlsTransport;
+	std::shared_ptr<WsTransport> mWsTransport;
+	std::recursive_mutex mInitMutex;
+
+	const Configuration mConfig;
+	string mScheme, mHost, mHostname, mService, mPath;
+	std::atomic<State> mState = State::Closed;
+
+	Queue<message_ptr> mRecvQueue;
+};
+} // namespace rtc
+
+#endif
+
+#endif // RTC_WEBSOCKET_H

src/base64.cpp

@@ -0,0 +1,64 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "base64.hpp"
+
+namespace rtc {
+
+using std::to_integer;
+
+string to_base64(const binary &data) {
+	static const char tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+	string out;
+	out.reserve(3 * ((data.size() + 3) / 4));
+	int i = 0;
+	while (data.size() - i >= 3) {
+		auto d0 = to_integer<uint8_t>(data[i]);
+		auto d1 = to_integer<uint8_t>(data[i + 1]);
+		auto d2 = to_integer<uint8_t>(data[i + 2]);
+		out += tab[d0 >> 2];
+		out += tab[((d0 & 3) << 4) | (d1 >> 4)];
+		out += tab[((d1 & 0x0F) << 2) | (d2 >> 6)];
+		out += tab[d2 & 0x3F];
+		i += 3;
+	}
+
+	int left = int(data.size() - i);
+	if (left) {
+		auto d0 = to_integer<uint8_t>(data[i]);
+		out += tab[d0 >> 2];
+		if (left == 1) {
+			out += tab[(d0 & 3) << 4];
+			out += '=';
+		} else { // left == 2
+			auto d1 = to_integer<uint8_t>(data[i + 1]);
+			out += tab[((d0 & 3) << 4) | (d1 >> 4)];
+			out += tab[(d1 & 0x0F) << 2];
+		}
+		out += '=';
+	}
+
+	return out;
+}
+
+} // namespace rtc
+
+#endif

src/base64.hpp

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_BASE64_H
+#define RTC_BASE64_H
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "include.hpp"
+
+namespace rtc {
+
+string to_base64(const binary &data);
+
+}
+
+#endif
+
+#endif

src/candidate.cpp

@@ -20,10 +20,19 @@
 
 #include <algorithm>
 #include <array>
+#include <cctype>
 #include <sstream>
+#include <unordered_map>
 
+#ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#else
 #include <netdb.h>
+#include <netinet/in.h>
 #include <sys/socket.h>
+#endif
+
 #include <sys/types.h>
 
 using std::array;
@@ -31,70 +40,174 @@ using std::string;
 
 namespace {
 
-inline bool hasprefix(const string &str, const string &prefix) {
+inline bool match_prefix(const string &str, const string &prefix) {
 	return str.size() >= prefix.size() &&
 	       std::mismatch(prefix.begin(), prefix.end(), str.begin()).first == prefix.end();
 }
 
+inline void trim_begin(string &str) {
+	str.erase(str.begin(),
+	          std::find_if(str.begin(), str.end(), [](char c) { return !std::isspace(c); }));
+}
+
+inline void trim_end(string &str) {
+	str.erase(
+	    std::find_if(str.rbegin(), str.rend(), [](char c) { return !std::isspace(c); }).base(),
+	    str.end());
+}
+
 } // namespace
 
 namespace rtc {
 
-Candidate::Candidate(string candidate, string mid) {
+Candidate::Candidate()
+    : mFoundation("none"), mComponent(0), mPriority(0), mTypeString("unknown"),
+      mTransportString("unknown"), mType(Type::Unknown), mTransportType(TransportType::Unknown),
+      mNode("0.0.0.0"), mService("9"), mFamily(Family::Unresolved), mPort(0) {}
+
+Candidate::Candidate(string candidate) : Candidate() {
+	if (!candidate.empty())
+		parse(std::move(candidate));
+}
+
+Candidate::Candidate(string candidate, string mid) : Candidate() {
+	if (!candidate.empty())
+		parse(std::move(candidate));
+	if (!mid.empty())
+		mMid.emplace(std::move(mid));
+}
+
+void Candidate::parse(string candidate) {
+	using TypeMap_t = std::unordered_map<string, Type>;
+	using TcpTypeMap_t = std::unordered_map<string, TransportType>;
+
+	static const TypeMap_t TypeMap = {{"host", Type::Host},
+	                                  {"srflx", Type::ServerReflexive},
+	                                  {"prflx", Type::PeerReflexive},
+	                                  {"relay", Type::Relayed}};
+
+	static const TcpTypeMap_t TcpTypeMap = {{"active", TransportType::TcpActive},
+	                                        {"passive", TransportType::TcpPassive},
+	                                        {"so", TransportType::TcpSo}};
+
 	const std::array prefixes{"a=", "candidate:"};
-	for (string prefix : prefixes)
+	for (const string &prefix : prefixes)
-		if (hasprefix(candidate, prefix))
+		if (match_prefix(candidate, prefix))
 			candidate.erase(0, prefix.size());
 
-	mCandidate = std::move(candidate);
+	PLOG_VERBOSE << "Parsing candidate: " << candidate;
-	mMid = std::move(mid);
 
-	// See RFC 5245 for format
+	// See RFC 8445 for format
-	std::stringstream ss(mCandidate);
+	std::istringstream iss(candidate);
-	int component{0}, priority{0};
+	string transport, typ_, type;
-	string foundation, transport, node, service, typ_, type;
+	if (!(iss >> mFoundation >> mComponent >> mTransportString >> mPriority &&
-	if (ss >> foundation >> component >> transport >> priority &&
+	      iss >> mNode >> mService >> typ_ >> mTypeString && typ_ == "typ"))
-	    ss >> node >> service >> typ_ >> type && typ_ == "typ") {
+		throw std::invalid_argument("Invalid candidate format");
 
-		// Try to resolve the node
+	std::getline(iss, mTail);
-		struct addrinfo hints = {};
+	trim_begin(mTail);
-		hints.ai_family = AF_UNSPEC;
+	trim_end(mTail);
-		hints.ai_flags = AI_ADDRCONFIG;
+
-		if (transport == "UDP" || transport == "udp") {
+	if (auto it = TypeMap.find(type); it != TypeMap.end())
-			hints.ai_socktype = SOCK_DGRAM;
+		mType = it->second;
-			hints.ai_protocol = IPPROTO_UDP;
+	else
+		mType = Type::Unknown;
+
+	if (transport == "UDP" || transport == "udp") {
+		mTransportType = TransportType::Udp;
+	} else if (transport == "TCP" || transport == "tcp") {
+		// Peek tail to find TCP type
+		std::istringstream tiss(mTail);
+		string tcptype_, tcptype;
+		if (tiss >> tcptype_ >> tcptype && tcptype_ == "tcptype") {
+			if (auto it = TcpTypeMap.find(tcptype); it != TcpTypeMap.end())
+				mTransportType = it->second;
+			else
+				mTransportType = TransportType::TcpUnknown;
+
+		} else {
+			mTransportType = TransportType::TcpUnknown;
 		}
-		struct addrinfo *result = nullptr;
+	} else {
-		if (getaddrinfo(node.c_str(), service.c_str(), &hints, &result) == 0) {
+		mTransportType = TransportType::Unknown;
-			for (auto p = result; p; p = p->ai_next)
+	}
-				if (p->ai_family == AF_INET || p->ai_family == AF_INET6) {
+}
-					// Rewrite the candidate
+
-					char nodebuffer[MAX_NUMERICNODE_LEN];
+void Candidate::hintMid(string mid) {
-					char servbuffer[MAX_NUMERICSERV_LEN];
+	if (!mMid)
-					if (getnameinfo(p->ai_addr, p->ai_addrlen, nodebuffer, MAX_NUMERICNODE_LEN,
+		mMid.emplace(std::move(mid));
-					                servbuffer, MAX_NUMERICSERV_LEN,
+}
-					                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+
-						string left;
+bool Candidate::resolve(ResolveMode mode) {
-						std::getline(ss, left);
+	PLOG_VERBOSE << "Resolving candidate (mode="
-						const char sp{' '};
+	             << (mode == ResolveMode::Simple ? "simple" : "lookup") << "): " << mNode << ' '
-						ss.clear();
+	             << mService;
-						ss << foundation << sp << component << sp << transport << sp << priority;
+
-						ss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
+	// Try to resolve the node and service
-						if (!left.empty())
+	struct addrinfo hints = {};
-							ss << sp << left;
+	hints.ai_family = AF_UNSPEC;
-						mCandidate = ss.str();
+	hints.ai_flags = AI_ADDRCONFIG;
-						break;
+	if (mTransportType == TransportType::Udp) {
-					}
+		hints.ai_socktype = SOCK_DGRAM;
+		hints.ai_protocol = IPPROTO_UDP;
+	} else if (mTransportType != TransportType::Unknown) {
+		hints.ai_socktype = SOCK_STREAM;
+		hints.ai_protocol = IPPROTO_TCP;
+	}
+
+	if (mode == ResolveMode::Simple)
+		hints.ai_flags |= AI_NUMERICHOST;
+
+	struct addrinfo *result = nullptr;
+	if (getaddrinfo(mNode.c_str(), mService.c_str(), &hints, &result) == 0) {
+		for (auto p = result; p; p = p->ai_next) {
+			if (p->ai_family == AF_INET || p->ai_family == AF_INET6) {
+				char nodebuffer[MAX_NUMERICNODE_LEN];
+				char servbuffer[MAX_NUMERICSERV_LEN];
+				if (getnameinfo(p->ai_addr, socklen_t(p->ai_addrlen), nodebuffer,
+				                MAX_NUMERICNODE_LEN, servbuffer, MAX_NUMERICSERV_LEN,
+				                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+
+					mAddress = nodebuffer;
+					mPort = uint16_t(std::stoul(servbuffer));
+					mFamily = p->ai_family == AF_INET6 ? Family::Ipv6 : Family::Ipv4;
+					PLOG_VERBOSE << "Resolved candidate: " << mAddress << ' ' << mPort;
+					break;
 				}
+			}
 		}
 
 		freeaddrinfo(result);
 	}
+
+	return mFamily != Family::Unresolved;
 }
 
-string Candidate::candidate() const { return "candidate:" + mCandidate; }
+Candidate::Type Candidate::type() const { return mType; }
 
-string Candidate::mid() const { return mMid; }
+Candidate::TransportType Candidate::transportType() const { return mTransportType; }
+
+uint32_t Candidate::priority() const { return mPriority; }
+
+string Candidate::candidate() const {
+	const char sp{' '};
+	std::ostringstream oss;
+	oss << "candidate:";
+	oss << mFoundation << sp << mComponent << sp << mTransportString << sp << mPriority << sp;
+	if (isResolved())
+		oss << mAddress << sp << mPort;
+	else
+		oss << mNode << sp << mService;
+
+	oss << sp << "typ" << sp << mTypeString;
+
+	if (!mTail.empty())
+		oss << sp << mTail;
+
+	return oss.str();
+}
+
+string Candidate::mid() const { return mMid.value_or("0"); }
 
 Candidate::operator string() const {
 	std::ostringstream line;
@@ -102,9 +215,60 @@ Candidate::operator string() const {
 	return line.str();
 }
 
+bool Candidate::operator==(const Candidate &other) const {
+	return mFoundation == other.mFoundation;
+}
+
+bool Candidate::operator!=(const Candidate &other) const {
+	return mFoundation != other.mFoundation;
+}
+
+bool Candidate::isResolved() const { return mFamily != Family::Unresolved; }
+
+Candidate::Family Candidate::family() const { return mFamily; }
+
+std::optional<string> Candidate::address() const {
+	return isResolved() ? std::make_optional(mAddress) : nullopt;
+}
+
+std::optional<uint16_t> Candidate::port() const {
+	return isResolved() ? std::make_optional(mPort) : nullopt;
+}
+
 } // namespace rtc
 
 std::ostream &operator<<(std::ostream &out, const rtc::Candidate &candidate) {
 	return out << std::string(candidate);
 }
 
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::Type &type) {
+	switch (type) {
+	case rtc::Candidate::Type::Host:
+		return out << "host";
+	case rtc::Candidate::Type::PeerReflexive:
+		return out << "prflx";
+	case rtc::Candidate::Type::ServerReflexive:
+		return out << "srflx";
+	case rtc::Candidate::Type::Relayed:
+		return out << "relay";
+	default:
+		return out << "unknown";
+	}
+}
+
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::TransportType &transportType) {
+	switch (transportType) {
+	case rtc::Candidate::TransportType::Udp:
+		return out << "UDP";
+	case rtc::Candidate::TransportType::TcpActive:
+		return out << "TCP_active";
+	case rtc::Candidate::TransportType::TcpPassive:
+		return out << "TCP_passive";
+	case rtc::Candidate::TransportType::TcpSo:
+		return out << "TCP_so";
+	case rtc::Candidate::TransportType::TcpUnknown:
+		return out << "TCP_unknown";
+	default:
+		return out << "unknown";
+	}
+}

src/capi.cpp

@@ -0,0 +1,837 @@
+/**
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "include.hpp"
+
+#include "rtc.h"
+
+#include "datachannel.hpp"
+#include "log.hpp"
+#include "peerconnection.hpp"
+#if RTC_ENABLE_WEBSOCKET
+#include "websocket.hpp"
+#endif
+
+#include "plog/Formatters/FuncMessageFormatter.h"
+
+#include <chrono>
+#include <exception>
+#include <mutex>
+#include <type_traits>
+#include <unordered_map>
+#include <utility>
+
+#ifdef _WIN32
+#include <codecvt>
+#include <locale>
+#endif
+
+using namespace rtc;
+using std::shared_ptr;
+using std::string;
+using std::chrono::milliseconds;
+
+namespace {
+
+std::unordered_map<int, shared_ptr<PeerConnection>> peerConnectionMap;
+std::unordered_map<int, shared_ptr<DataChannel>> dataChannelMap;
+std::unordered_map<int, shared_ptr<Track>> trackMap;
+#if RTC_ENABLE_WEBSOCKET
+std::unordered_map<int, shared_ptr<WebSocket>> webSocketMap;
+#endif
+std::unordered_map<int, void *> userPointerMap;
+std::mutex mutex;
+int lastId = 0;
+
+std::optional<void *> getUserPointer(int id) {
+	std::lock_guard lock(mutex);
+	auto it = userPointerMap.find(id);
+	return it != userPointerMap.end() ? std::make_optional(it->second) : nullopt;
+}
+
+void setUserPointer(int i, void *ptr) {
+	std::lock_guard lock(mutex);
+	userPointerMap[i] = ptr;
+}
+
+shared_ptr<PeerConnection> getPeerConnection(int id) {
+	std::lock_guard lock(mutex);
+	if (auto it = peerConnectionMap.find(id); it != peerConnectionMap.end())
+		return it->second;
+	else
+		throw std::invalid_argument("PeerConnection ID does not exist");
+}
+
+shared_ptr<DataChannel> getDataChannel(int id) {
+	std::lock_guard lock(mutex);
+	if (auto it = dataChannelMap.find(id); it != dataChannelMap.end())
+		return it->second;
+	else
+		throw std::invalid_argument("DataChannel ID does not exist");
+}
+
+shared_ptr<Track> getTrack(int id) {
+	std::lock_guard lock(mutex);
+	if (auto it = trackMap.find(id); it != trackMap.end())
+		return it->second;
+	else
+		throw std::invalid_argument("Track ID does not exist");
+}
+
+int emplacePeerConnection(shared_ptr<PeerConnection> ptr) {
+	std::lock_guard lock(mutex);
+	int pc = ++lastId;
+	peerConnectionMap.emplace(std::make_pair(pc, ptr));
+	userPointerMap.emplace(std::make_pair(pc, nullptr));
+	return pc;
+}
+
+int emplaceDataChannel(shared_ptr<DataChannel> ptr) {
+	std::lock_guard lock(mutex);
+	int dc = ++lastId;
+	dataChannelMap.emplace(std::make_pair(dc, ptr));
+	userPointerMap.emplace(std::make_pair(dc, nullptr));
+	return dc;
+}
+
+int emplaceTrack(shared_ptr<Track> ptr) {
+	std::lock_guard lock(mutex);
+	int tr = ++lastId;
+	trackMap.emplace(std::make_pair(tr, ptr));
+	userPointerMap.emplace(std::make_pair(tr, nullptr));
+	return tr;
+}
+
+void erasePeerConnection(int pc) {
+	std::lock_guard lock(mutex);
+	if (peerConnectionMap.erase(pc) == 0)
+		throw std::invalid_argument("PeerConnection ID does not exist");
+	userPointerMap.erase(pc);
+}
+
+void eraseDataChannel(int dc) {
+	std::lock_guard lock(mutex);
+	if (dataChannelMap.erase(dc) == 0)
+		throw std::invalid_argument("DataChannel ID does not exist");
+	userPointerMap.erase(dc);
+}
+
+void eraseTrack(int tr) {
+	std::lock_guard lock(mutex);
+	if (trackMap.erase(tr) == 0)
+		throw std::invalid_argument("Track ID does not exist");
+	userPointerMap.erase(tr);
+}
+
+#if RTC_ENABLE_WEBSOCKET
+shared_ptr<WebSocket> getWebSocket(int id) {
+	std::lock_guard lock(mutex);
+	if (auto it = webSocketMap.find(id); it != webSocketMap.end())
+		return it->second;
+	else
+		throw std::invalid_argument("WebSocket ID does not exist");
+}
+
+int emplaceWebSocket(shared_ptr<WebSocket> ptr) {
+	std::lock_guard lock(mutex);
+	int ws = ++lastId;
+	webSocketMap.emplace(std::make_pair(ws, ptr));
+	userPointerMap.emplace(std::make_pair(ws, nullptr));
+	return ws;
+}
+
+void eraseWebSocket(int ws) {
+	std::lock_guard lock(mutex);
+	if (webSocketMap.erase(ws) == 0)
+		throw std::invalid_argument("WebSocket ID does not exist");
+	userPointerMap.erase(ws);
+}
+#endif
+
+shared_ptr<Channel> getChannel(int id) {
+	std::lock_guard lock(mutex);
+	if (auto it = dataChannelMap.find(id); it != dataChannelMap.end())
+		return it->second;
+	if (auto it = trackMap.find(id); it != trackMap.end())
+		return it->second;
+#if RTC_ENABLE_WEBSOCKET
+	if (auto it = webSocketMap.find(id); it != webSocketMap.end())
+		return it->second;
+#endif
+	throw std::invalid_argument("DataChannel, Track, or WebSocket ID does not exist");
+}
+
+template <typename F> int wrap(F func) {
+	try {
+		return int(func());
+
+	} catch (const std::invalid_argument &e) {
+		PLOG_ERROR << e.what();
+		return RTC_ERR_INVALID;
+	} catch (const std::exception &e) {
+		PLOG_ERROR << e.what();
+		return RTC_ERR_FAILURE;
+	}
+}
+
+#define WRAP(statement)                                                                            \
+	wrap([&]() {                                                                                   \
+		statement;                                                                                 \
+		return RTC_ERR_SUCCESS;                                                                    \
+	})
+
+int copyAndReturn(string s, char *buffer, int size) {
+	if (!buffer)
+		return int(s.size() + 1);
+
+	if (size < int(s.size()))
+		return RTC_ERR_TOO_SMALL;
+
+	std::copy(s.begin(), s.end(), buffer);
+	buffer[s.size()] = '\0';
+	return int(s.size() + 1);
+}
+
+int copyAndReturn(binary b, char *buffer, int size) {
+	if (!buffer)
+		return int(b.size());
+
+	if (size < int(b.size()))
+		return RTC_ERR_TOO_SMALL;
+
+	auto data = reinterpret_cast<const char *>(b.data());
+	std::copy(data, data + b.size(), buffer);
+	buffer[b.size()] = '\0';
+	return int(b.size());
+}
+
+class plogAppender : public plog::IAppender {
+public:
+	plogAppender(rtcLogCallbackFunc cb = nullptr) { setCallback(cb); }
+
+	plogAppender(plogAppender &&appender) : callback(nullptr) {
+		std::lock_guard lock(appender.callbackMutex);
+		std::swap(appender.callback, callback);
+	}
+
+	void setCallback(rtcLogCallbackFunc cb) {
+		std::lock_guard lock(callbackMutex);
+		callback = cb;
+	}
+
+	void write(const plog::Record &record) override {
+		plog::Severity severity = record.getSeverity();
+		auto formatted = plog::FuncMessageFormatter::format(record);
+		formatted.pop_back(); // remove newline
+#ifdef _WIN32
+		using convert_type = std::codecvt_utf8<wchar_t>;
+		std::wstring_convert<convert_type, wchar_t> converter;
+		std::string str = converter.to_bytes(formatted);
+#else
+		std::string str = formatted;
+#endif
+		std::lock_guard lock(callbackMutex);
+		if (callback)
+			callback(static_cast<rtcLogLevel>(record.getSeverity()), str.c_str());
+		else
+			std::cout << plog::severityToString(severity) << " " << str << std::endl;
+	}
+
+private:
+	rtcLogCallbackFunc callback;
+	std::mutex callbackMutex;
+};
+
+} // namespace
+
+void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb) {
+	static std::optional<plogAppender> appender;
+	const auto severity = static_cast<plog::Severity>(level);
+	std::lock_guard lock(mutex);
+	if (appender) {
+		appender->setCallback(cb);
+		InitLogger(severity, nullptr); // change the severity
+	} else if (cb) {
+		appender.emplace(plogAppender(cb));
+		InitLogger(severity, &appender.value());
+	} else {
+		InitLogger(severity, nullptr); // log to stdout
+	}
+}
+
+void rtcSetUserPointer(int i, void *ptr) { setUserPointer(i, ptr); }
+
+int rtcCreatePeerConnection(const rtcConfiguration *config) {
+	return WRAP({
+		Configuration c;
+		for (int i = 0; i < config->iceServersCount; ++i)
+			c.iceServers.emplace_back(string(config->iceServers[i]));
+
+		if (config->portRangeBegin || config->portRangeEnd) {
+			c.portRangeBegin = config->portRangeBegin;
+			c.portRangeEnd = config->portRangeEnd;
+		}
+
+		return emplacePeerConnection(std::make_shared<PeerConnection>(c));
+	});
+}
+
+int rtcDeletePeerConnection(int pc) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		peerConnection->onDataChannel(nullptr);
+		peerConnection->onLocalDescription(nullptr);
+		peerConnection->onLocalCandidate(nullptr);
+		peerConnection->onStateChange(nullptr);
+		peerConnection->onGatheringStateChange(nullptr);
+
+		erasePeerConnection(pc);
+	});
+}
+
+int rtcAddDataChannel(int pc, const char *label) { return rtcAddDataChannelEx(pc, label, nullptr); }
+
+int rtcAddDataChannelEx(int pc, const char *label, const rtcDataChannelInit *init) {
+	return WRAP({
+		DataChannelInit dci = {};
+		if (init) {
+			auto *reliability = &init->reliability;
+			dci.reliability.unordered = reliability->unordered;
+			if (reliability->unreliable) {
+				if (reliability->maxPacketLifeTime > 0) {
+					dci.reliability.type = Reliability::Type::Timed;
+					dci.reliability.rexmit = milliseconds(reliability->maxPacketLifeTime);
+				} else {
+					dci.reliability.type = Reliability::Type::Rexmit;
+					dci.reliability.rexmit = int(reliability->maxRetransmits);
+				}
+			} else {
+				dci.reliability.type = Reliability::Type::Reliable;
+			}
+
+			dci.negotiated = init->negotiated;
+			dci.id = init->manualStream ? std::make_optional(init->stream) : nullopt;
+			dci.protocol = init->protocol ? init->protocol : "";
+		}
+
+		auto peerConnection = getPeerConnection(pc);
+		int dc = emplaceDataChannel(
+		    peerConnection->addDataChannel(string(label ? label : ""), std::move(dci)));
+
+		if (auto ptr = getUserPointer(pc))
+			rtcSetUserPointer(dc, *ptr);
+
+		return dc;
+	});
+}
+
+int rtcCreateDataChannel(int pc, const char *label) {
+	return rtcCreateDataChannelEx(pc, label, nullptr);
+}
+
+int rtcCreateDataChannelEx(int pc, const char *label, const rtcDataChannelInit *init) {
+	int dc = rtcAddDataChannelEx(pc, label, init);
+	rtcSetLocalDescription(pc, NULL);
+	return dc;
+}
+
+int rtcDeleteDataChannel(int dc) {
+	return WRAP({
+		auto dataChannel = getDataChannel(dc);
+		dataChannel->onOpen(nullptr);
+		dataChannel->onClosed(nullptr);
+		dataChannel->onError(nullptr);
+		dataChannel->onMessage(nullptr);
+		dataChannel->onBufferedAmountLow(nullptr);
+		dataChannel->onAvailable(nullptr);
+
+		eraseDataChannel(dc);
+	});
+}
+
+int rtcAddTrack(int pc, const char *mediaDescriptionSdp) {
+	return WRAP({
+		if (!mediaDescriptionSdp)
+			throw std::invalid_argument("Unexpected null pointer for track media description");
+
+		auto peerConnection = getPeerConnection(pc);
+		Description::Media media{string(mediaDescriptionSdp)};
+		int tr = emplaceTrack(peerConnection->addTrack(std::move(media)));
+		if (auto ptr = getUserPointer(pc))
+			rtcSetUserPointer(tr, *ptr);
+
+		return tr;
+	});
+}
+
+int rtcDeleteTrack(int tr) {
+	return WRAP({
+		auto track = getTrack(tr);
+		track->onOpen(nullptr);
+		track->onClosed(nullptr);
+		track->onError(nullptr);
+		track->onMessage(nullptr);
+		track->onBufferedAmountLow(nullptr);
+		track->onAvailable(nullptr);
+
+		eraseTrack(tr);
+	});
+}
+
+int rtcGetTrackDescription(int tr, char *buffer, int size) {
+	return WRAP({
+		auto track = getTrack(tr);
+		return copyAndReturn(track->description(), buffer, size);
+	});
+}
+
+#if RTC_ENABLE_WEBSOCKET
+int rtcCreateWebSocket(const char *url) {
+	return WRAP({
+		auto ws = std::make_shared<WebSocket>();
+		ws->open(url);
+		return emplaceWebSocket(ws);
+	});
+}
+
+int rtcCreateWebSocketEx(const char *url, const rtcWsConfiguration *config) {
+	return WRAP({
+		WebSocket::Configuration c;
+		c.disableTlsVerification = config->disableTlsVerification;
+		auto ws = std::make_shared<WebSocket>(c);
+		ws->open(url);
+		return emplaceWebSocket(ws);
+	});
+}
+
+int rtcDeleteWebsocket(int ws) {
+	return WRAP({
+		auto webSocket = getWebSocket(ws);
+		webSocket->onOpen(nullptr);
+		webSocket->onClosed(nullptr);
+		webSocket->onError(nullptr);
+		webSocket->onMessage(nullptr);
+		webSocket->onBufferedAmountLow(nullptr);
+		webSocket->onAvailable(nullptr);
+
+		eraseWebSocket(ws);
+	});
+}
+#endif
+
+int rtcSetLocalDescriptionCallback(int pc, rtcDescriptionCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onLocalDescription([pc, cb](Description desc) {
+				if (auto ptr = getUserPointer(pc))
+					cb(pc, string(desc).c_str(), desc.typeString().c_str(), *ptr);
+			});
+		else
+			peerConnection->onLocalDescription(nullptr);
+	});
+}
+
+int rtcSetLocalCandidateCallback(int pc, rtcCandidateCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onLocalCandidate([pc, cb](Candidate cand) {
+				if (auto ptr = getUserPointer(pc))
+					cb(pc, cand.candidate().c_str(), cand.mid().c_str(), *ptr);
+			});
+		else
+			peerConnection->onLocalCandidate(nullptr);
+	});
+}
+
+int rtcSetStateChangeCallback(int pc, rtcStateChangeCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onStateChange([pc, cb](PeerConnection::State state) {
+				if (auto ptr = getUserPointer(pc))
+					cb(pc, static_cast<rtcState>(state), *ptr);
+			});
+		else
+			peerConnection->onStateChange(nullptr);
+	});
+}
+
+int rtcSetGatheringStateChangeCallback(int pc, rtcGatheringStateCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onGatheringStateChange([pc, cb](PeerConnection::GatheringState state) {
+				if (auto ptr = getUserPointer(pc))
+					cb(pc, static_cast<rtcGatheringState>(state), *ptr);
+			});
+		else
+			peerConnection->onGatheringStateChange(nullptr);
+	});
+}
+
+int rtcSetSignalingStateChangeCallback(int pc, rtcSignalingStateCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onSignalingStateChange([pc, cb](PeerConnection::SignalingState state) {
+				if (auto ptr = getUserPointer(pc))
+					cb(pc, static_cast<rtcSignalingState>(state), *ptr);
+			});
+		else
+			peerConnection->onGatheringStateChange(nullptr);
+	});
+}
+
+int rtcSetDataChannelCallback(int pc, rtcDataChannelCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onDataChannel([pc, cb](std::shared_ptr<DataChannel> dataChannel) {
+				int dc = emplaceDataChannel(dataChannel);
+				if (auto ptr = getUserPointer(pc)) {
+					rtcSetUserPointer(dc, *ptr);
+					cb(pc, dc, *ptr);
+				}
+			});
+		else
+			peerConnection->onDataChannel(nullptr);
+	});
+}
+
+int rtcSetTrackCallback(int pc, rtcTrackCallbackFunc cb) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		if (cb)
+			peerConnection->onTrack([pc, cb](std::shared_ptr<Track> track) {
+				int tr = emplaceTrack(track);
+				if (auto ptr = getUserPointer(pc)) {
+					rtcSetUserPointer(tr, *ptr);
+					cb(pc, tr, *ptr);
+				}
+			});
+		else
+			peerConnection->onTrack(nullptr);
+	});
+}
+
+int rtcSetLocalDescription(int pc, const char *type) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+		peerConnection->setLocalDescription(type ? Description::stringToType(type)
+		                                         : Description::Type::Unspec);
+	});
+}
+
+int rtcSetRemoteDescription(int pc, const char *sdp, const char *type) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (!sdp)
+			throw std::invalid_argument("Unexpected null pointer for remote description");
+
+		peerConnection->setRemoteDescription({string(sdp), type ? string(type) : ""});
+	});
+}
+
+int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (!cand)
+			throw std::invalid_argument("Unexpected null pointer for remote candidate");
+
+		peerConnection->addRemoteCandidate({string(cand), mid ? string(mid) : ""});
+	});
+}
+
+int rtcGetLocalDescription(int pc, char *buffer, int size) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (auto desc = peerConnection->localDescription())
+			return copyAndReturn(string(*desc), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
+	});
+}
+
+int rtcGetRemoteDescription(int pc, char *buffer, int size) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (auto desc = peerConnection->remoteDescription())
+			return copyAndReturn(string(*desc), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
+	});
+}
+
+int rtcGetLocalAddress(int pc, char *buffer, int size) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (auto addr = peerConnection->localAddress())
+			return copyAndReturn(std::move(*addr), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
+	});
+}
+
+int rtcGetRemoteAddress(int pc, char *buffer, int size) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		if (auto addr = peerConnection->remoteAddress())
+			return copyAndReturn(std::move(*addr), buffer, size);
+		else
+			return RTC_ERR_NOT_AVAIL;
+	});
+}
+
+int rtcGetSelectedCandidatePair(int pc, char *local, int localSize, char *remote, int remoteSize) {
+	return WRAP({
+		auto peerConnection = getPeerConnection(pc);
+
+		Candidate localCand;
+		Candidate remoteCand;
+		if (!peerConnection->getSelectedCandidatePair(&localCand, &remoteCand))
+			return RTC_ERR_NOT_AVAIL;
+
+		int localRet = copyAndReturn(string(localCand), local, localSize);
+		if (localRet < 0)
+			return localRet;
+
+		int remoteRet = copyAndReturn(string(remoteCand), remote, remoteSize);
+		if (remoteRet < 0)
+			return remoteRet;
+
+		return std::max(localRet, remoteRet);
+	});
+}
+
+int rtcGetDataChannelStream(int dc) {
+	return WRAP({
+		auto dataChannel = getDataChannel(dc);
+		return int(dataChannel->id());
+	});
+}
+
+int rtcGetDataChannelLabel(int dc, char *buffer, int size) {
+	return WRAP({
+		auto dataChannel = getDataChannel(dc);
+		return copyAndReturn(dataChannel->label(), buffer, size);
+	});
+}
+
+int rtcGetDataChannelProtocol(int dc, char *buffer, int size) {
+	return WRAP({
+		auto dataChannel = getDataChannel(dc);
+		return copyAndReturn(dataChannel->protocol(), buffer, size);
+	});
+}
+
+int rtcGetDataChannelReliability(int dc, rtcReliability *reliability) {
+	return WRAP({
+		auto dataChannel = getDataChannel(dc);
+
+		if (!reliability)
+			throw std::invalid_argument("Unexpected null pointer for reliability");
+
+		Reliability dcr = dataChannel->reliability();
+		std::memset(reliability, 0, sizeof(*reliability));
+		reliability->unordered = dcr.unordered;
+		if (dcr.type == Reliability::Type::Timed) {
+			reliability->unreliable = true;
+			reliability->maxPacketLifeTime = unsigned(std::get<milliseconds>(dcr.rexmit).count());
+		} else if (dcr.type == Reliability::Type::Rexmit) {
+			reliability->unreliable = true;
+			reliability->maxRetransmits = unsigned(std::get<int>(dcr.rexmit));
+		} else {
+			reliability->unreliable = false;
+		}
+		return RTC_ERR_SUCCESS;
+	});
+}
+
+int rtcSetOpenCallback(int id, rtcOpenCallbackFunc cb) {
+	return WRAP({
+		auto channel = getChannel(id);
+		if (cb)
+			channel->onOpen([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(id, *ptr);
+			});
+		else
+			channel->onOpen(nullptr);
+	});
+}
+
+int rtcSetClosedCallback(int id, rtcClosedCallbackFunc cb) {
+	return WRAP({
+		auto channel = getChannel(id);
+		if (cb)
+			channel->onClosed([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(id, *ptr);
+			});
+		else
+			channel->onClosed(nullptr);
+	});
+}
+
+int rtcSetErrorCallback(int id, rtcErrorCallbackFunc cb) {
+	return WRAP({
+		auto channel = getChannel(id);
+		if (cb)
+			channel->onError([id, cb](string error) {
+				if (auto ptr = getUserPointer(id))
+					cb(id, error.c_str(), *ptr);
+			});
+		else
+			channel->onError(nullptr);
+	});
+}
+
+int rtcSetMessageCallback(int id, rtcMessageCallbackFunc cb) {
+	return WRAP({
+		auto channel = getChannel(id);
+		if (cb)
+			channel->onMessage(
+			    [id, cb](binary b) {
+				    if (auto ptr = getUserPointer(id))
+					    cb(id, reinterpret_cast<const char *>(b.data()), int(b.size()), *ptr);
+			    },
+			    [id, cb](string s) {
+				    if (auto ptr = getUserPointer(id))
+					    cb(id, s.c_str(), -int(s.size() + 1), *ptr);
+			    });
+		else
+			channel->onMessage(nullptr);
+	});
+}
+
+int rtcSendMessage(int id, const char *data, int size) {
+	return WRAP({
+		auto channel = getChannel(id);
+
+		if (!data && size != 0)
+			throw std::invalid_argument("Unexpected null pointer for data");
+
+		if (size >= 0) {
+			auto b = reinterpret_cast<const byte *>(data);
+			channel->send(binary(b, b + size));
+			return size;
+		} else {
+			string str(data);
+			int len = int(str.size());
+			channel->send(std::move(str));
+			return len;
+		}
+	});
+}
+
+int rtcGetBufferedAmount(int id) {
+	return WRAP({
+		auto channel = getChannel(id);
+		return int(channel->bufferedAmount());
+	});
+}
+
+int rtcSetBufferedAmountLowThreshold(int id, int amount) {
+	return WRAP({
+		auto channel = getChannel(id);
+		channel->setBufferedAmountLowThreshold(size_t(amount));
+	});
+}
+
+int rtcSetBufferedAmountLowCallback(int id, rtcBufferedAmountLowCallbackFunc cb) {
+	return WRAP({
+		auto channel = getChannel(id);
+		if (cb)
+			channel->onBufferedAmountLow([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(id, *ptr);
+			});
+		else
+			channel->onBufferedAmountLow(nullptr);
+	});
+}
+
+int rtcGetAvailableAmount(int id) {
+	return WRAP({ return int(getChannel(id)->availableAmount()); });
+}
+
+int rtcSetAvailableCallback(int id, rtcAvailableCallbackFunc cb) {
+	return WRAP({
+		auto channel = getChannel(id);
+		if (cb)
+			channel->onAvailable([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(id, *ptr);
+			});
+		else
+			channel->onAvailable(nullptr);
+	});
+}
+
+int rtcReceiveMessage(int id, char *buffer, int *size) {
+	return WRAP({
+		auto channel = getChannel(id);
+
+		if (!size)
+			throw std::invalid_argument("Unexpected null pointer for size");
+
+		*size = std::abs(*size);
+
+		auto message = channel->peek();
+		if (!message)
+			return RTC_ERR_NOT_AVAIL;
+
+		return std::visit( //
+		    overloaded{
+		        [&](binary b) {
+			        int ret = copyAndReturn(std::move(b), buffer, *size);
+			        if (ret >= 0) {
+				        channel->receive(); // discard
+				        *size = ret;
+				        return RTC_ERR_SUCCESS;
+			        } else {
+				        *size = int(b.size());
+				        return ret;
+			        }
+		        },
+		        [&](string s) {
+			        int ret = copyAndReturn(std::move(s), buffer, *size);
+			        if (ret >= 0) {
+				        channel->receive(); // discard
+				        *size = -ret;
+				        return RTC_ERR_SUCCESS;
+			        } else {
+				        *size = -int(s.size() + 1);
+				        return ret;
+			        }
+		        },
+		    },
+		    *message);
+	});
+}
+
+void rtcPreload() { rtc::Preload(); }
+void rtcCleanup() { rtc::Cleanup(); }

src/certificate.cpp

@@ -17,6 +17,7 @@
  */
 
 #include "certificate.hpp"
+#include "threadpool.hpp"
 
 #include <cassert>
 #include <chrono>
@@ -25,108 +26,61 @@
 #include <sstream>
 #include <unordered_map>
 
-#include <gnutls/crypto.h>
-
 using std::shared_ptr;
 using std::string;
+using std::unique_ptr;
 
-namespace {
+#if USE_GNUTLS
-
-void check_gnutls(int ret, const string &message = "GnuTLS error") {
-	if (ret != GNUTLS_E_SUCCESS)
-		throw std::runtime_error(message + ": " + gnutls_strerror(ret));
-}
-
-gnutls_certificate_credentials_t *create_credentials() {
-	auto creds = new gnutls_certificate_credentials_t;
-	check_gnutls(gnutls_certificate_allocate_credentials(creds));
-	return creds;
-}
-
-void delete_credentials(gnutls_certificate_credentials_t *creds) {
-	gnutls_certificate_free_credentials(*creds);
-	delete creds;
-}
-
-gnutls_x509_crt_t *create_crt() {
-	auto crt = new gnutls_x509_crt_t;
-	check_gnutls(gnutls_x509_crt_init(crt));
-	return crt;
-}
-
-void delete_crt(gnutls_x509_crt_t *crt) {
-	gnutls_x509_crt_deinit(*crt);
-	delete crt;
-}
-
-gnutls_x509_privkey_t *create_privkey() {
-	auto privkey = new gnutls_x509_privkey_t;
-	check_gnutls(gnutls_x509_privkey_init(privkey));
-	return privkey;
-}
-
-void delete_privkey(gnutls_x509_privkey_t *privkey) {
-	gnutls_x509_privkey_deinit(*privkey);
-	delete privkey;
-}
-
-gnutls_datum_t make_datum(char *data, size_t size) {
-	gnutls_datum_t datum;
-	datum.data = reinterpret_cast<unsigned char *>(data);
-	datum.size = size;
-	return datum;
-}
-
-} // namespace
 
 namespace rtc {
 
 Certificate::Certificate(string crt_pem, string key_pem)
-    : mCredentials(create_credentials(), delete_credentials) {
+    : mCredentials(gnutls::new_credentials(), gnutls::free_credentials) {
 
-	gnutls_datum_t crt_datum = make_datum(crt_pem.data(), crt_pem.size());
+	gnutls_datum_t crt_datum = gnutls::make_datum(crt_pem.data(), crt_pem.size());
-	gnutls_datum_t key_datum = make_datum(key_pem.data(), key_pem.size());
+	gnutls_datum_t key_datum = gnutls::make_datum(key_pem.data(), key_pem.size());
 
-	check_gnutls(gnutls_certificate_set_x509_key_mem(*mCredentials, &crt_datum, &key_datum,
+	gnutls::check(gnutls_certificate_set_x509_key_mem(*mCredentials, &crt_datum, &key_datum,
-	                                                 GNUTLS_X509_FMT_PEM),
+	                                                  GNUTLS_X509_FMT_PEM),
-	             "Unable to import PEM");
+	              "Unable to import PEM");
 
-	auto create_crt_list = [this]() -> gnutls_x509_crt_t * {
+	auto new_crt_list = [this]() -> gnutls_x509_crt_t * {
 		gnutls_x509_crt_t *crt_list = nullptr;
 		unsigned int crt_list_size = 0;
-		check_gnutls(gnutls_certificate_get_x509_crt(*mCredentials, 0, &crt_list, &crt_list_size));
+		gnutls::check(gnutls_certificate_get_x509_crt(*mCredentials, 0, &crt_list, &crt_list_size));
 		assert(crt_list_size == 1);
 		return crt_list;
 	};
 
-	auto delete_crt_list = [](gnutls_x509_crt_t *crt_list) {
+	auto free_crt_list = [](gnutls_x509_crt_t *crt_list) {
 		gnutls_x509_crt_deinit(crt_list[0]);
 		gnutls_free(crt_list);
 	};
 
-	std::unique_ptr<gnutls_x509_crt_t, decltype(delete_crt_list)> crt_list(create_crt_list(),
+	std::unique_ptr<gnutls_x509_crt_t, decltype(free_crt_list)> crt_list(new_crt_list(),
-	                                                                       delete_crt_list);
+	                                                                     free_crt_list);
 
 	mFingerprint = make_fingerprint(*crt_list);
 }
 
 Certificate::Certificate(gnutls_x509_crt_t crt, gnutls_x509_privkey_t privkey)
-    : mCredentials(create_credentials(), delete_credentials), mFingerprint(make_fingerprint(crt)) {
+    : mCredentials(gnutls::new_credentials(), gnutls::free_credentials),
+      mFingerprint(make_fingerprint(crt)) {
 
-	check_gnutls(gnutls_certificate_set_x509_key(*mCredentials, &crt, 1, privkey),
+	gnutls::check(gnutls_certificate_set_x509_key(*mCredentials, &crt, 1, privkey),
-	             "Unable to set certificate and key pair in credentials");
+	              "Unable to set certificate and key pair in credentials");
 }
 
-string Certificate::fingerprint() const { return mFingerprint; }
-
 gnutls_certificate_credentials_t Certificate::credentials() const { return *mCredentials; }
 
+string Certificate::fingerprint() const { return mFingerprint; }
+
 string make_fingerprint(gnutls_x509_crt_t crt) {
 	const size_t size = 32;
 	unsigned char buffer[size];
 	size_t len = size;
-	check_gnutls(gnutls_x509_crt_get_fingerprint(crt, GNUTLS_DIG_SHA256, buffer, &len),
+	gnutls::check(gnutls_x509_crt_get_fingerprint(crt, GNUTLS_DIG_SHA256, buffer, &len),
-	             "X509 fingerprint error");
+	              "X509 fingerprint error");
 
 	std::ostringstream oss;
 	oss << std::hex << std::uppercase << std::setfill('0');
@@ -138,21 +92,20 @@ string make_fingerprint(gnutls_x509_crt_t crt) {
 	return oss.str();
 }
 
-shared_ptr<Certificate> make_certificate(const string &commonName) {
+namespace {
-	static std::unordered_map<string, shared_ptr<Certificate>> cache;
-	static std::mutex cacheMutex;
 
-	std::lock_guard<std::mutex> lock(cacheMutex);
+certificate_ptr make_certificate_impl(string commonName) {
-	if (auto it = cache.find(commonName); it != cache.end())
+	using namespace gnutls;
-		return it->second;
+	unique_ptr<gnutls_x509_crt_t, decltype(&free_crt)> crt(new_crt(), free_crt);
-
+	unique_ptr<gnutls_x509_privkey_t, decltype(&free_privkey)> privkey(new_privkey(), free_privkey);
-	std::unique_ptr<gnutls_x509_crt_t, decltype(&delete_crt)> crt(create_crt(), delete_crt);
-	std::unique_ptr<gnutls_x509_privkey_t, decltype(&delete_privkey)> privkey(create_privkey(),
-	                                                                          delete_privkey);
 
+#ifdef RSA_KEY_BITS_2048
+	const unsigned int bits = 2048;
+#else
 	const unsigned int bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA, GNUTLS_SEC_PARAM_HIGH);
-	check_gnutls(gnutls_x509_privkey_generate(*privkey, GNUTLS_PK_RSA, bits, 0),
+#endif
-	             "Unable to generate key pair");
+	gnutls::check(gnutls_x509_privkey_generate(*privkey, GNUTLS_PK_RSA, bits, 0),
+	              "Unable to generate key pair");
 
 	using namespace std::chrono;
 	auto now = time_point_cast<seconds>(system_clock::now());
@@ -168,12 +121,145 @@ shared_ptr<Certificate> make_certificate(const string &commonName) {
 	gnutls_rnd(GNUTLS_RND_NONCE, serial, serialSize);
 	gnutls_x509_crt_set_serial(*crt, serial, serialSize);
 
-	check_gnutls(gnutls_x509_crt_sign2(*crt, *crt, *privkey, GNUTLS_DIG_SHA256, 0),
+	gnutls::check(gnutls_x509_crt_sign2(*crt, *crt, *privkey, GNUTLS_DIG_SHA256, 0),
-	             "Unable to auto-sign certificate");
+	              "Unable to auto-sign certificate");
 
-	auto certificate = std::make_shared<Certificate>(*crt, *privkey);
+	return std::make_shared<Certificate>(*crt, *privkey);
-	cache.emplace(std::make_pair(commonName, certificate));
+}
-	return certificate;
+
+} // namespace
+
+} // namespace rtc
+
+#else // USE_GNUTLS==0
+
+namespace rtc {
+
+Certificate::Certificate(string crt_pem, string key_pem) {
+	BIO *bio = BIO_new(BIO_s_mem());
+	BIO_write(bio, crt_pem.data(), int(crt_pem.size()));
+	mX509 = shared_ptr<X509>(PEM_read_bio_X509(bio, nullptr, 0, 0), X509_free);
+	BIO_free(bio);
+	if (!mX509)
+		throw std::invalid_argument("Unable to import certificate PEM");
+
+	bio = BIO_new(BIO_s_mem());
+	BIO_write(bio, key_pem.data(), int(key_pem.size()));
+	mPKey = shared_ptr<EVP_PKEY>(PEM_read_bio_PrivateKey(bio, nullptr, 0, 0), EVP_PKEY_free);
+	BIO_free(bio);
+	if (!mPKey)
+		throw std::invalid_argument("Unable to import PEM key PEM");
+
+	mFingerprint = make_fingerprint(mX509.get());
+}
+
+Certificate::Certificate(shared_ptr<X509> x509, shared_ptr<EVP_PKEY> pkey)
+    : mX509(std::move(x509)), mPKey(std::move(pkey)) {
+	mFingerprint = make_fingerprint(mX509.get());
+}
+
+string Certificate::fingerprint() const { return mFingerprint; }
+
+std::tuple<X509 *, EVP_PKEY *> Certificate::credentials() const {
+	return {mX509.get(), mPKey.get()};
+}
+
+string make_fingerprint(X509 *x509) {
+	const size_t size = 32;
+	unsigned char buffer[size];
+	unsigned int len = size;
+	if (!X509_digest(x509, EVP_sha256(), buffer, &len))
+		throw std::runtime_error("X509 fingerprint error");
+
+	std::ostringstream oss;
+	oss << std::hex << std::uppercase << std::setfill('0');
+	for (size_t i = 0; i < len; ++i) {
+		if (i)
+			oss << std::setw(1) << ':';
+		oss << std::setw(2) << unsigned(buffer[i]);
+	}
+	return oss.str();
+}
+
+namespace {
+
+certificate_ptr make_certificate_impl(string commonName) {
+	shared_ptr<X509> x509(X509_new(), X509_free);
+	shared_ptr<EVP_PKEY> pkey(EVP_PKEY_new(), EVP_PKEY_free);
+
+	unique_ptr<RSA, decltype(&RSA_free)> rsa(RSA_new(), RSA_free);
+	unique_ptr<BIGNUM, decltype(&BN_free)> exponent(BN_new(), BN_free);
+	unique_ptr<BIGNUM, decltype(&BN_free)> serial_number(BN_new(), BN_free);
+	unique_ptr<X509_NAME, decltype(&X509_NAME_free)> name(X509_NAME_new(), X509_NAME_free);
+
+	if (!x509 || !pkey || !rsa || !exponent || !serial_number || !name)
+		throw std::runtime_error("Unable allocate structures for certificate generation");
+
+#ifdef RSA_KEY_BITS_2048
+	const int bits = 2048;
+#else
+	const int bits = 3072;
+#endif
+	const unsigned int e = 65537; // 2^16 + 1
+
+	if (!pkey || !rsa || !exponent || !BN_set_word(exponent.get(), e) ||
+	    !RSA_generate_key_ex(rsa.get(), bits, exponent.get(), NULL) ||
+	    !EVP_PKEY_assign_RSA(pkey.get(), rsa.release())) // the key will be freed when pkey is freed
+		throw std::runtime_error("Unable to generate key pair");
+
+	const size_t serialSize = 16;
+	auto *commonNameBytes =
+	    reinterpret_cast<unsigned char *>(const_cast<char *>(commonName.c_str()));
+
+	if (!X509_gmtime_adj(X509_getm_notBefore(x509.get()), 3600 * -1) ||
+	    !X509_gmtime_adj(X509_getm_notAfter(x509.get()), 3600 * 24 * 365) ||
+	    !X509_set_version(x509.get(), 1) || !X509_set_pubkey(x509.get(), pkey.get()) ||
+	    !BN_pseudo_rand(serial_number.get(), serialSize, 0, 0) ||
+	    !BN_to_ASN1_INTEGER(serial_number.get(), X509_get_serialNumber(x509.get())) ||
+	    !X509_NAME_add_entry_by_NID(name.get(), NID_commonName, MBSTRING_UTF8, commonNameBytes, -1,
+	                                -1, 0) ||
+	    !X509_set_subject_name(x509.get(), name.get()) ||
+	    !X509_set_issuer_name(x509.get(), name.get()))
+		throw std::runtime_error("Unable to set certificate properties");
+
+	if (!X509_sign(x509.get(), pkey.get(), EVP_sha256()))
+		throw std::runtime_error("Unable to auto-sign certificate");
+
+	return std::make_shared<Certificate>(x509, pkey);
+}
+
+} // namespace
+
+} // namespace rtc
+
+#endif
+
+// Common for GnuTLS and OpenSSL
+
+namespace rtc {
+
+namespace {
+
+static std::unordered_map<string, future_certificate_ptr> CertificateCache;
+static std::mutex CertificateCacheMutex;
+
+} // namespace
+
+future_certificate_ptr make_certificate(string commonName) {
+	std::lock_guard lock(CertificateCacheMutex);
+
+	if (auto it = CertificateCache.find(commonName); it != CertificateCache.end())
+		return it->second;
+
+	auto future = ThreadPool::Instance().enqueue(make_certificate_impl, commonName);
+	auto shared = future.share();
+	CertificateCache.emplace(std::move(commonName), shared);
+	return shared;
+}
+
+void CleanupCertificateCache() {
+	std::lock_guard lock(CertificateCacheMutex);
+	CertificateCache.clear();
 }
 
 } // namespace rtc

src/certificate.hpp

@@ -20,26 +20,50 @@
 #define RTC_CERTIFICATE_H
 
 #include "include.hpp"
+#include "tls.hpp"
 
-#include <gnutls/x509.h>
+#include <future>
+#include <tuple>
 
 namespace rtc {
 
 class Certificate {
 public:
-	Certificate(gnutls_x509_crt_t crt, gnutls_x509_privkey_t privkey);
 	Certificate(string crt_pem, string key_pem);
 
-	string fingerprint() const;
+#if USE_GNUTLS
+	Certificate(gnutls_x509_crt_t crt, gnutls_x509_privkey_t privkey);
 	gnutls_certificate_credentials_t credentials() const;
+#else
+	Certificate(std::shared_ptr<X509> x509, std::shared_ptr<EVP_PKEY> pkey);
+	std::tuple<X509 *, EVP_PKEY *> credentials() const;
+#endif
+
+	string fingerprint() const;
 
 private:
+#if USE_GNUTLS
 	std::shared_ptr<gnutls_certificate_credentials_t> mCredentials;
+#else
+	std::shared_ptr<X509> mX509;
+	std::shared_ptr<EVP_PKEY> mPKey;
+#endif
+
 	string mFingerprint;
 };
 
+#if USE_GNUTLS
 string make_fingerprint(gnutls_x509_crt_t crt);
-std::shared_ptr<Certificate> make_certificate(const string &commonName);
+#else
+string make_fingerprint(X509 *x509);
+#endif
+
+using certificate_ptr = std::shared_ptr<Certificate>;
+using future_certificate_ptr = std::shared_future<certificate_ptr>;
+
+future_certificate_ptr make_certificate(string commonName = "libdatachannel"); // cached
+
+void CleanupCertificateCache();
 
 } // namespace rtc
 

src/channel.cpp

@@ -20,44 +20,73 @@
 
 namespace rtc {
 
+size_t Channel::maxMessageSize() const { return DEFAULT_MAX_MESSAGE_SIZE; }
+
+size_t Channel::bufferedAmount() const { return mBufferedAmount; }
+
+size_t Channel::availableAmount() const { return 0; }
+
 void Channel::onOpen(std::function<void()> callback) { mOpenCallback = callback; }
 
 void Channel::onClosed(std::function<void()> callback) { mClosedCallback = callback; }
 
-void Channel::onError(std::function<void(const string &error)> callback) {
+void Channel::onError(std::function<void(string error)> callback) { mErrorCallback = callback; }
-	mErrorCallback = callback;
-}
 
-void Channel::onMessage(std::function<void(const std::variant<binary, string> &data)> callback) {
+void Channel::onMessage(std::function<void(message_variant data)> callback) {
 	mMessageCallback = callback;
+
+	// Pass pending messages
+	while (auto message = receive())
+		mMessageCallback(*message);
 }
 
-void Channel::onMessage(std::function<void(const binary &data)> binaryCallback,
+void Channel::onMessage(std::function<void(binary data)> binaryCallback,
-                        std::function<void(const string &data)> stringCallback) {
+                        std::function<void(string data)> stringCallback) {
-	onMessage([binaryCallback, stringCallback](const std::variant<binary, string> &data) {
+	onMessage([binaryCallback, stringCallback](std::variant<binary, string> data) {
-		std::visit(overloaded{binaryCallback, stringCallback}, data);
+		std::visit(overloaded{binaryCallback, stringCallback}, std::move(data));
 	});
 }
 
-void Channel::triggerOpen(void) {
+void Channel::onBufferedAmountLow(std::function<void()> callback) {
-	if (mOpenCallback)
+	mBufferedAmountLowCallback = callback;
-		mOpenCallback();
 }
 
-void Channel::triggerClosed(void) {
+void Channel::setBufferedAmountLowThreshold(size_t amount) { mBufferedAmountLowThreshold = amount; }
-	if (mClosedCallback)
+
-		mClosedCallback();
+void Channel::onAvailable(std::function<void()> callback) { mAvailableCallback = callback; }
+
+void Channel::triggerOpen() { mOpenCallback(); }
+
+void Channel::triggerClosed() { mClosedCallback(); }
+
+void Channel::triggerError(string error) { mErrorCallback(error); }
+
+void Channel::triggerAvailable(size_t count) {
+	if (count == 1)
+		mAvailableCallback();
+
+	while (mMessageCallback && count--) {
+		auto message = receive();
+		if (!message)
+			break;
+		mMessageCallback(*message);
+	}
 }
 
-void Channel::triggerError(const string &error) {
+void Channel::triggerBufferedAmount(size_t amount) {
-	if (mErrorCallback)
+	size_t previous = mBufferedAmount.exchange(amount);
-		mErrorCallback(error);
+	size_t threshold = mBufferedAmountLowThreshold.load();
+	if (previous > threshold && amount <= threshold)
+		mBufferedAmountLowCallback();
 }
 
-void Channel::triggerMessage(const std::variant<binary, string> &data) {
+void Channel::resetCallbacks() {
-	if (mMessageCallback)
+	mOpenCallback = nullptr;
-		mMessageCallback(data);
+	mClosedCallback = nullptr;
+	mErrorCallback = nullptr;
+	mMessageCallback = nullptr;
+	mAvailableCallback = nullptr;
+	mBufferedAmountLowCallback = nullptr;
 }
 
 } // namespace rtc
-

src/configuration.cpp

@@ -18,22 +18,74 @@
 
 #include "configuration.hpp"
 
+#include <regex>
+
 namespace rtc {
 
-using std::to_string;
+IceServer::IceServer(const string &url) {
+	// Modified regex from RFC 3986, see https://tools.ietf.org/html/rfc3986#appendix-B
+	static const char *rs =
+	    R"(^(([^:.@/?#]+):)?(/{0,2}((([^:@]*)(:([^@]*))?)@)?(([^:/?#]*)(:([^/?#]*))?))?([^?#]*)(\?([^#]*))?(#(.*))?)";
+	static const std::regex r(rs, std::regex::extended);
 
-IceServer::IceServer(const string &host) {
+	std::smatch m;
-	if(size_t pos = host.rfind(':'); pos != string::npos) {
+	if (!std::regex_match(url, m, r) || m[10].length() == 0)
-		hostname = host.substr(0, pos);
+		throw std::invalid_argument("Invalid ICE server URL: " + url);
-		service = host.substr(pos + 1);
+
-	} else {
+	std::vector<std::optional<string>> opt(m.size());
-		hostname = host;
+	std::transform(m.begin(), m.end(), opt.begin(), [](const auto &sm) {
-		service = "3478"; // STUN UDP port
+		return sm.length() > 0 ? std::make_optional(string(sm)) : nullopt;
+	});
+
+	string scheme = opt[2].value_or("stun");
+	relayType = RelayType::TurnUdp;
+	if (scheme == "stun" || scheme == "STUN")
+		type = Type::Stun;
+	else if (scheme == "turn" || scheme == "TURN")
+		type = Type::Turn;
+	else if (scheme == "turns" || scheme == "TURNS") {
+		type = Type::Turn;
+		relayType = RelayType::TurnTls;
+	} else
+		throw std::invalid_argument("Unknown ICE server protocol: " + scheme);
+
+	if (auto &query = opt[15]) {
+		if (query->find("transport=udp") != string::npos)
+			relayType = RelayType::TurnUdp;
+		if (query->find("transport=tcp") != string::npos)
+			relayType = RelayType::TurnTcp;
+		if (query->find("transport=tls") != string::npos)
+			relayType = RelayType::TurnTls;
 	}
+
+	username = opt[6].value_or("");
+	password = opt[8].value_or("");
+	hostname = opt[10].value();
+	service = opt[12].value_or(relayType == RelayType::TurnTls ? "5349" : "3478");
+
+	while (!hostname.empty() && hostname.front() == '[')
+		hostname.erase(hostname.begin());
+	while (!hostname.empty() && hostname.back() == ']')
+		hostname.pop_back();
 }
 
-IceServer::IceServer(const string &hostname_, uint16_t port_) : IceServer(hostname_, to_string(port_)) {}
+IceServer::IceServer(string hostname_, uint16_t port_)
+    : IceServer(std::move(hostname_), std::to_string(port_)) {}
 
-IceServer::IceServer(const string &hostname_, const string &service_) : hostname(hostname_), service(service_) {}
+IceServer::IceServer(string hostname_, string service_)
+    : hostname(std::move(hostname_)), service(std::move(service_)), type(Type::Stun) {}
+
+IceServer::IceServer(string hostname_, uint16_t port_, string username_, string password_,
+                     RelayType relayType_)
+    : IceServer(hostname_, std::to_string(port_), std::move(username_), std::move(password_),
+                relayType_) {}
+
+IceServer::IceServer(string hostname_, string service_, string username_, string password_,
+                     RelayType relayType_)
+    : hostname(std::move(hostname_)), service(std::move(service_)), type(Type::Turn),
+      username(std::move(username_)), password(std::move(password_)), relayType(relayType_) {}
+
+ProxyServer::ProxyServer(Type type_, string ip_, uint16_t port_, string username_, string password_)
+    : type(type_), ip(ip_), port(port_), username(username_), password(password_) {}
 
 } // namespace rtc

src/datachannel.cpp

@@ -17,12 +17,21 @@
  */
 
 #include "datachannel.hpp"
+#include "include.hpp"
 #include "peerconnection.hpp"
 #include "sctptransport.hpp"
 
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
 namespace rtc {
 
 using std::shared_ptr;
+using std::weak_ptr;
+using std::chrono::milliseconds;
 
 // Messages for the DataChannel establishment protocol
 // See https://tools.ietf.org/html/draft-ietf-rtcweb-data-protocol-09
@@ -35,6 +44,12 @@ enum MessageType : uint8_t {
 	MESSAGE_CLOSE = 0x04
 };
 
+enum ChannelType : uint8_t {
+	CHANNEL_RELIABLE = 0x00,
+	CHANNEL_PARTIAL_RELIABLE_REXMIT = 0x01,
+	CHANNEL_PARTIAL_RELIABLE_TIMED = 0x02
+};
+
 #pragma pack(push, 1)
 struct OpenMessage {
 	uint8_t type = MESSAGE_OPEN;
@@ -57,51 +72,18 @@ struct CloseMessage {
 };
 #pragma pack(pop)
 
-DataChannel::DataChannel(unsigned int stream, string label, string protocol,
+DataChannel::DataChannel(weak_ptr<PeerConnection> pc, uint16_t stream, string label,
-                         Reliability reliability)
+                         string protocol, Reliability reliability)
-    : mStream(stream), mLabel(std::move(label)), mProtocol(std::move(protocol)),
+    : mPeerConnection(pc), mStream(stream), mLabel(std::move(label)),
-      mReliability(std::make_shared<Reliability>(std::move(reliability))) {}
+      mProtocol(std::move(protocol)),
-
+      mReliability(std::make_shared<Reliability>(std::move(reliability))),
-DataChannel::DataChannel(unsigned int stream, shared_ptr<SctpTransport> sctpTransport)
+      mRecvQueue(RECV_QUEUE_LIMIT, message_size_func) {}
-    : mStream(stream), mSctpTransport(sctpTransport),
-      mReliability(std::make_shared<Reliability>()) {}
 
 DataChannel::~DataChannel() { close(); }
 
-void DataChannel::close() {
+uint16_t DataChannel::stream() const { return mStream; }
-	mIsOpen = false;
-	if (!mIsClosed) {
-		mIsClosed = true;
-		if (mSctpTransport)
-			mSctpTransport->reset(mStream);
-	}
-}
 
-void DataChannel::send(const std::variant<binary, string> &data) {
+uint16_t DataChannel::id() const { return uint16_t(mStream); }
-	if (mIsClosed || !mSctpTransport)
-		return;
-
-	std::visit(
-	    [this](const auto &d) {
-		    using T = std::decay_t<decltype(d)>;
-		    constexpr auto type = std::is_same_v<T, string> ? Message::String : Message::Binary;
-		    auto *b = reinterpret_cast<const byte *>(d.data());
-		    // Before the ACK has been received on a DataChannel, all messages must be sent ordered
-		    auto reliability = mIsOpen ? mReliability : nullptr;
-		    mSctpTransport->send(make_message(b, b + d.size(), type, mStream, reliability));
-	    },
-	    data);
-}
-
-void DataChannel::send(const byte *data, size_t size) {
-	if (mIsClosed || !mSctpTransport)
-		return;
-
-	auto reliability = mIsOpen ? mReliability : nullptr;
-	mSctpTransport->send(make_message(data, data + size, Message::Binary, mStream, reliability));
-}
-
-unsigned int DataChannel::stream() const { return mStream; }
 
 string DataChannel::label() const { return mLabel; }
 
@@ -109,60 +91,127 @@ string DataChannel::protocol() const { return mProtocol; }
 
 Reliability DataChannel::reliability() const { return *mReliability; }
 
+void DataChannel::close() {
+	mIsClosed = true;
+	if (mIsOpen.exchange(false))
+		if (auto transport = mSctpTransport.lock())
+			transport->closeStream(mStream);
+
+	mSctpTransport.reset();
+	resetCallbacks();
+}
+
+void DataChannel::remoteClose() {
+	if (!mIsClosed.exchange(true))
+		triggerClosed();
+
+	mIsOpen = false;
+	mSctpTransport.reset();
+}
+
+bool DataChannel::send(message_variant data) { return outgoing(make_message(std::move(data))); }
+
+bool DataChannel::send(const byte *data, size_t size) {
+	return outgoing(std::make_shared<Message>(data, data + size, Message::Binary));
+}
+
+std::optional<message_variant> DataChannel::receive() {
+	while (auto next = mRecvQueue.tryPop()) {
+		message_ptr message = *next;
+		if (message->type != Message::Control)
+			return to_variant(std::move(*message));
+
+		auto raw = reinterpret_cast<const uint8_t *>(message->data());
+		if (!message->empty() && raw[0] == MESSAGE_CLOSE)
+			remoteClose();
+	}
+
+	return nullopt;
+}
+
+std::optional<message_variant> DataChannel::peek() {
+	while (auto next = mRecvQueue.peek()) {
+		message_ptr message = *next;
+		if (message->type != Message::Control)
+			return to_variant(std::move(*message));
+
+		auto raw = reinterpret_cast<const uint8_t *>(message->data());
+		if (!message->empty() && raw[0] == MESSAGE_CLOSE)
+			remoteClose();
+
+		mRecvQueue.tryPop();
+	}
+
+	return nullopt;
+}
+
 bool DataChannel::isOpen(void) const { return mIsOpen; }
 
 bool DataChannel::isClosed(void) const { return mIsClosed; }
 
-void DataChannel::open(shared_ptr<SctpTransport> sctpTransport) {
+size_t DataChannel::maxMessageSize() const {
-	mSctpTransport = sctpTransport;
+	size_t remoteMax = DEFAULT_MAX_MESSAGE_SIZE;
+	if (auto pc = mPeerConnection.lock())
+		if (auto description = pc->remoteDescription())
+			if (auto *application = description->application())
+				if (auto maxMessageSize = application->maxMessageSize())
+					remoteMax = *maxMessageSize > 0 ? *maxMessageSize : LOCAL_MAX_MESSAGE_SIZE;
 
-	uint8_t channelType = static_cast<uint8_t>(mReliability->type);
+	return std::min(remoteMax, LOCAL_MAX_MESSAGE_SIZE);
-	if (mReliability->unordered)
+}
-		channelType &= 0x80;
 
-	using std::chrono::milliseconds;
+size_t DataChannel::availableAmount() const { return mRecvQueue.amount(); }
-	uint32_t reliabilityParameter = 0;
-	if (mReliability->type == Reliability::TYPE_PARTIAL_RELIABLE_REXMIT)
-		reliabilityParameter = uint32_t(std::get<int>(mReliability->rexmit));
-	else if (mReliability->type == Reliability::TYPE_PARTIAL_RELIABLE_TIMED)
-		reliabilityParameter = uint32_t(std::get<milliseconds>(mReliability->rexmit).count());
 
-	const size_t len = sizeof(OpenMessage) + mLabel.size() + mProtocol.size();
+void DataChannel::open(shared_ptr<SctpTransport> transport) {
-	binary buffer(len, byte(0));
+	mSctpTransport = transport;
-	auto &open = *reinterpret_cast<OpenMessage *>(buffer.data());
-	open.type = MESSAGE_OPEN;
-	open.channelType = mReliability->type;
-	open.priority = htons(0);
-	open.reliabilityParameter = htonl(reliabilityParameter);
-	open.labelLength = htons(mLabel.size());
-	open.protocolLength = htons(mProtocol.size());
 
-	auto end = reinterpret_cast<char *>(buffer.data() + sizeof(OpenMessage));
+	if (!mIsOpen.exchange(true))
-	std::copy(mLabel.begin(), mLabel.end(), end);
+		triggerOpen();
-	std::copy(mProtocol.begin(), mProtocol.end(), end + mLabel.size());
+}
 
-	mSctpTransport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
+void DataChannel::processOpenMessage(message_ptr) {
+	PLOG_WARNING << "Received an open message for a user-negotiated DataChannel, ignoring";
+}
+
+bool DataChannel::outgoing(message_ptr message) {
+	if (mIsClosed)
+		throw std::runtime_error("DataChannel is closed");
+
+	if (message->size() > maxMessageSize())
+		throw std::runtime_error("Message size exceeds limit");
+
+	auto transport = mSctpTransport.lock();
+	if (!transport)
+		throw std::runtime_error("DataChannel transport is not open");
+
+	// Before the ACK has been received on a DataChannel, all messages must be sent ordered
+	message->reliability = mIsOpen ? mReliability : nullptr;
+	message->stream = mStream;
+	return transport->send(message);
 }
 
 void DataChannel::incoming(message_ptr message) {
+	if (!message)
+		return;
+
 	switch (message->type) {
 	case Message::Control: {
+		if (message->size() == 0)
+			break; // Ignore
 		auto raw = reinterpret_cast<const uint8_t *>(message->data());
 		switch (raw[0]) {
 		case MESSAGE_OPEN:
 			processOpenMessage(message);
 			break;
 		case MESSAGE_ACK:
-			if (!mIsOpen) {
+			if (!mIsOpen.exchange(true)) {
-				mIsOpen = true;
 				triggerOpen();
 			}
 			break;
 		case MESSAGE_CLOSE:
-			if (mIsOpen) {
+			// The close message will be processed in-order in receive()
-				close();
+			mRecvQueue.push(message);
-				triggerClosed();
+			triggerAvailable(mRecvQueue.size());
-			}
 			break;
 		default:
 			// Ignore
@@ -170,18 +219,77 @@ void DataChannel::incoming(message_ptr message) {
 		}
 		break;
 	}
-	case Message::String: {
+	case Message::String:
-		triggerMessage(string(reinterpret_cast<const char *>(message->data()), message->size()));
+	case Message::Binary:
+		mRecvQueue.push(message);
+		triggerAvailable(mRecvQueue.size());
 		break;
-	}
+	default:
-	case Message::Binary: {
+		// Ignore
-		triggerMessage(*message);
 		break;
 	}
-	}
 }
 
-void DataChannel::processOpenMessage(message_ptr message) {
+NegociatedDataChannel::NegociatedDataChannel(std::weak_ptr<PeerConnection> pc, uint16_t stream,
+                                             string label, string protocol, Reliability reliability)
+    : DataChannel(pc, stream, std::move(label), std::move(protocol), std::move(reliability)) {}
+
+NegociatedDataChannel::NegociatedDataChannel(std::weak_ptr<PeerConnection> pc,
+                                             std::weak_ptr<SctpTransport> transport,
+                                             uint16_t stream)
+    : DataChannel(pc, stream, "", "", {}) {
+	mSctpTransport = transport;
+}
+
+NegociatedDataChannel::~NegociatedDataChannel() {}
+
+void NegociatedDataChannel::open(shared_ptr<SctpTransport> transport) {
+	mSctpTransport = transport;
+
+	uint8_t channelType;
+	uint32_t reliabilityParameter;
+	switch (mReliability->type) {
+	case Reliability::Type::Rexmit:
+		channelType = CHANNEL_PARTIAL_RELIABLE_REXMIT;
+		reliabilityParameter = uint32_t(std::get<int>(mReliability->rexmit));
+		break;
+
+	case Reliability::Type::Timed:
+		channelType = CHANNEL_PARTIAL_RELIABLE_TIMED;
+		reliabilityParameter = uint32_t(std::get<milliseconds>(mReliability->rexmit).count());
+		break;
+
+	default:
+		channelType = CHANNEL_RELIABLE;
+		reliabilityParameter = 0;
+		break;
+	}
+
+	if (mReliability->unordered)
+		channelType |= 0x80;
+
+	const size_t len = sizeof(OpenMessage) + mLabel.size() + mProtocol.size();
+	binary buffer(len, byte(0));
+	auto &open = *reinterpret_cast<OpenMessage *>(buffer.data());
+	open.type = MESSAGE_OPEN;
+	open.channelType = channelType;
+	open.priority = htons(0);
+	open.reliabilityParameter = htonl(reliabilityParameter);
+	open.labelLength = htons(uint16_t(mLabel.size()));
+	open.protocolLength = htons(uint16_t(mProtocol.size()));
+
+	auto end = reinterpret_cast<char *>(buffer.data() + sizeof(OpenMessage));
+	std::copy(mLabel.begin(), mLabel.end(), end);
+	std::copy(mProtocol.begin(), mProtocol.end(), end + mLabel.size());
+
+	transport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
+}
+
+void NegociatedDataChannel::processOpenMessage(message_ptr message) {
+	auto transport = mSctpTransport.lock();
+	if (!transport)
+		throw std::runtime_error("DataChannel has no transport");
+
 	if (message->size() < sizeof(OpenMessage))
 		throw std::invalid_argument("DataChannel open message too small");
 
@@ -198,19 +306,18 @@ void DataChannel::processOpenMessage(message_ptr message) {
 	mLabel.assign(end, open.labelLength);
 	mProtocol.assign(end + open.labelLength, open.protocolLength);
 
-	using std::chrono::milliseconds;
+	mReliability->unordered = (open.channelType & 0x80) != 0;
-	mReliability->unordered = (open.reliabilityParameter & 0x80) != 0;
 	switch (open.channelType & 0x7F) {
-	case Reliability::TYPE_PARTIAL_RELIABLE_REXMIT:
+	case CHANNEL_PARTIAL_RELIABLE_REXMIT:
-		mReliability->type = Reliability::TYPE_PARTIAL_RELIABLE_REXMIT;
+		mReliability->type = Reliability::Type::Rexmit;
 		mReliability->rexmit = int(open.reliabilityParameter);
 		break;
-	case Reliability::TYPE_PARTIAL_RELIABLE_TIMED:
+	case CHANNEL_PARTIAL_RELIABLE_TIMED:
-		mReliability->type = Reliability::TYPE_PARTIAL_RELIABLE_TIMED;
+		mReliability->type = Reliability::Type::Timed;
 		mReliability->rexmit = milliseconds(open.reliabilityParameter);
 		break;
 	default:
-		mReliability->type = Reliability::TYPE_RELIABLE;
+		mReliability->type = Reliability::Type::Reliable;
 		mReliability->rexmit = int(0);
 	}
 
@@ -218,9 +325,10 @@ void DataChannel::processOpenMessage(message_ptr message) {
 	auto &ack = *reinterpret_cast<AckMessage *>(buffer.data());
 	ack.type = MESSAGE_ACK;
 
-	mSctpTransport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
+	transport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
 
-	triggerOpen();
+	if (!mIsOpen.exchange(true))
+		triggerOpen();
 }
 
 } // namespace rtc

src/dtlssrtptransport.cpp

@@ -0,0 +1,356 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "dtlssrtptransport.hpp"
+#include "tls.hpp"
+
+#if RTC_ENABLE_MEDIA
+
+#include <cstring>
+#include <exception>
+
+using std::shared_ptr;
+using std::to_integer;
+using std::to_string;
+
+namespace rtc {
+
+void DtlsSrtpTransport::Init() { srtp_init(); }
+
+void DtlsSrtpTransport::Cleanup() { srtp_shutdown(); }
+
+DtlsSrtpTransport::DtlsSrtpTransport(std::shared_ptr<IceTransport> lower,
+                                     shared_ptr<Certificate> certificate,
+                                     verifier_callback verifierCallback,
+                                     message_callback srtpRecvCallback,
+                                     state_callback stateChangeCallback)
+    : DtlsTransport(lower, certificate, std::move(verifierCallback),
+                    std::move(stateChangeCallback)),
+      mSrtpRecvCallback(std::move(srtpRecvCallback)) { // distinct from Transport recv callback
+
+	PLOG_DEBUG << "Initializing DTLS-SRTP transport";
+
+#if USE_GNUTLS
+	PLOG_DEBUG << "Setting SRTP profile (GnuTLS)";
+	gnutls::check(gnutls_srtp_set_profile(mSession, GNUTLS_SRTP_AES128_CM_HMAC_SHA1_80),
+	              "Failed to set SRTP profile");
+#else
+	PLOG_DEBUG << "Setting SRTP profile (OpenSSL)";
+	// returns 0 on success, 1 on error
+	if (SSL_set_tlsext_use_srtp(mSsl, "SRTP_AES128_CM_SHA1_80"))
+		throw std::runtime_error("Failed to set SRTP profile: " +
+		                         openssl::error_string(ERR_get_error()));
+#endif
+
+	if (srtp_err_status_t err = srtp_create(&mSrtpIn, nullptr)) {
+		throw std::runtime_error("SRTP create failed, status=" + to_string(static_cast<int>(err)));
+	}
+	if (srtp_err_status_t err = srtp_create(&mSrtpOut, nullptr)) {
+		srtp_dealloc(mSrtpIn);
+		throw std::runtime_error("SRTP create failed, status=" + to_string(static_cast<int>(err)));
+	}
+}
+
+DtlsSrtpTransport::~DtlsSrtpTransport() {
+	stop(); // stop before deallocating
+
+	srtp_dealloc(mSrtpIn);
+	srtp_dealloc(mSrtpOut);
+}
+
+bool DtlsSrtpTransport::sendMedia(message_ptr message) {
+	if (!message)
+		return false;
+
+	if (!mInitDone) {
+		PLOG_WARNING << "SRTP media sent before keys are derived";
+		return false;
+	}
+
+	int size = int(message->size());
+	PLOG_VERBOSE << "Send size=" << size;
+
+	// The RTP header has a minimum size of 12 bytes
+	// An RTCP packet can have a minimum size of 8 bytes
+	if (size < 8)
+		throw std::runtime_error("RTP/RTCP packet too short");
+
+	// srtp_protect() and srtp_protect_rtcp() assume that they can write SRTP_MAX_TRAILER_LEN (for
+	// the authentication tag) into the location in memory immediately following the RTP packet.
+	message->resize(size + SRTP_MAX_TRAILER_LEN);
+
+	uint8_t value2 = to_integer<uint8_t>(*(message->begin() + 1)) & 0x7F;
+	PLOG_VERBOSE << "Demultiplexing SRTCP and SRTP with RTP payload type, value="
+	             << unsigned(value2);
+
+	// RFC 5761 Multiplexing RTP and RTCP 4. Distinguishable RTP and RTCP Packets
+	// https://tools.ietf.org/html/rfc5761#section-4
+	// It is RECOMMENDED to follow the guidelines in the RTP/AVP profile for the choice of RTP
+	// payload type values, with the additional restriction that payload type values in the
+	// range 64-95 MUST NOT be used. Specifically, dynamic RTP payload types SHOULD be chosen in
+	// the range 96-127 where possible. Values below 64 MAY be used if that is insufficient
+	// [...]
+	if (value2 >= 64 && value2 <= 95) { // Range 64-95 (inclusive) MUST be RTCP
+		if (srtp_err_status_t err = srtp_protect_rtcp(mSrtpOut, message->data(), &size)) {
+			if (err == srtp_err_status_replay_fail)
+				throw std::runtime_error("SRTCP packet is a replay");
+			else if (err == srtp_err_status_no_ctx) {
+				auto ssrc = reinterpret_cast<RTCP_SR *>(message->data())->senderSSRC();
+				PLOG_INFO << "Adding SSRC to SRTCP: " << ssrc;
+				addSSRC(ssrc);
+				if ((err = srtp_protect_rtcp(mSrtpOut, message->data(), &size)))
+					throw std::runtime_error("SRTCP protect error, status=" +
+					                         to_string(static_cast<int>(err)));
+			} else {
+				throw std::runtime_error("SRTCP protect error, status=" +
+				                         to_string(static_cast<int>(err)));
+			}
+		}
+		PLOG_VERBOSE << "Protected SRTCP packet, size=" << size;
+	} else {
+		if (srtp_err_status_t err = srtp_protect(mSrtpOut, message->data(), &size)) {
+			if (err == srtp_err_status_replay_fail)
+				throw std::runtime_error("Outgoing SRTP packet is a replay");
+			else if (err == srtp_err_status_no_ctx) {
+				auto ssrc = reinterpret_cast<RTP *>(message->data())->ssrc();
+				PLOG_INFO << "Adding SSRC to RTP: " << ssrc;
+				addSSRC(ssrc);
+				if ((err = srtp_protect(mSrtpOut, message->data(), &size)))
+					throw std::runtime_error("SRTP protect error, status=" +
+					                         to_string(static_cast<int>(err)));
+			} else
+				throw std::runtime_error("SRTP protect error, status=" +
+				                         to_string(static_cast<int>(err)));
+		}
+		PLOG_VERBOSE << "Protected SRTP packet, size=" << size;
+	}
+
+	message->resize(size);
+
+	if (message->dscp == 0) { // Track might override the value
+		// Set recommended medium-priority DSCP value
+		// See https://tools.ietf.org/html/draft-ietf-tsvwg-rtcweb-qos-18
+		message->dscp = 36; // AF42: Assured Forwarding class 4, medium drop probability
+	}
+
+	return Transport::outgoing(message); // bypass DTLS DSCP marking
+}
+
+void DtlsSrtpTransport::incoming(message_ptr message) {
+	if (!mInitDone) {
+		// Bypas
+		DtlsTransport::incoming(message);
+		return;
+	}
+
+	int size = int(message->size());
+	if (size == 0)
+		return;
+
+	// RFC 5764 5.1.2. Reception
+	// https://tools.ietf.org/html/rfc5764#section-5.1.2
+	// The process for demultiplexing a packet is as follows. The receiver looks at the first byte
+	// of the packet. [...] If the value is in between 128 and 191 (inclusive), then the packet is
+	// RTP (or RTCP [...]). If the value is between 20 and 63 (inclusive), the packet is DTLS.
+	uint8_t value1 = to_integer<uint8_t>(*message->begin());
+	PLOG_VERBOSE << "Demultiplexing DTLS and SRTP/SRTCP with first byte, value="
+	             << unsigned(value1);
+
+	if (value1 >= 20 && value1 <= 63) {
+		PLOG_VERBOSE << "Incoming DTLS packet, size=" << size;
+		DtlsTransport::incoming(message);
+
+	} else if (value1 >= 128 && value1 <= 191) {
+		// The RTP header has a minimum size of 12 bytes
+		// An RTCP packet can have a minimum size of 8 bytes
+		if (size < 8) {
+			PLOG_WARNING << "Incoming SRTP/SRTCP packet too short, size=" << size;
+			return;
+		}
+
+		uint8_t value2 = to_integer<uint8_t>(*(message->begin() + 1)) & 0x7F;
+		PLOG_VERBOSE << "Demultiplexing SRTCP and SRTP with RTP payload type, value="
+		             << unsigned(value2);
+
+		// See RFC 5761 reference above
+		if (value2 >= 64 && value2 <= 95) { // Range 64-95 (inclusive) MUST be RTCP
+			PLOG_VERBOSE << "Incoming SRTCP packet, size=" << size;
+			if (srtp_err_status_t err = srtp_unprotect_rtcp(mSrtpIn, message->data(), &size)) {
+				if (err == srtp_err_status_replay_fail)
+					PLOG_WARNING << "Incoming SRTCP packet is a replay";
+				else if (err == srtp_err_status_auth_fail)
+					PLOG_WARNING << "Incoming SRTCP packet failed authentication check";
+				else if (err == srtp_err_status_no_ctx) {
+					auto ssrc = reinterpret_cast<RTCP_SR *>(message->data())->senderSSRC();
+					PLOG_INFO << "Adding SSRC to RTCP: " << ssrc;
+					addSSRC(ssrc);
+					if ((err = srtp_unprotect_rtcp(mSrtpIn, message->data(), &size)))
+						throw std::runtime_error("SRTCP unprotect error, status=" +
+						                         to_string(static_cast<int>(err)));
+				} else {
+					PLOG_WARNING << "SRTCP unprotect error, status=" << err
+					             << " SSRC=" << ((RTCP_SR *)message->data())->senderSSRC();
+				}
+				return;
+			}
+			PLOG_VERBOSE << "Unprotected SRTCP packet, size=" << size;
+			message->type = Message::Type::Control;
+			message->stream = reinterpret_cast<RTCP_SR *>(message->data())->senderSSRC();
+		} else {
+			PLOG_VERBOSE << "Incoming SRTP packet, size=" << size;
+			if (srtp_err_status_t err = srtp_unprotect(mSrtpIn, message->data(), &size)) {
+				if (err == srtp_err_status_replay_fail)
+					PLOG_WARNING << "Incoming SRTP packet is a replay";
+				else if (err == srtp_err_status_auth_fail)
+					PLOG_WARNING << "Incoming SRTP packet failed authentication check";
+				else if (err == srtp_err_status_no_ctx) {
+					auto ssrc = reinterpret_cast<RTP *>(message->data())->ssrc();
+					PLOG_INFO << "Adding SSRC to RTP: " << ssrc;
+					addSSRC(ssrc);
+					if ((err = srtp_unprotect(mSrtpIn, message->data(), &size)))
+						throw std::runtime_error("SRTP unprotect error, status=" +
+						                         to_string(static_cast<int>(err)));
+				} else
+					PLOG_WARNING << "SRTP unprotect error, status=" << err
+					             << " SSRC=" << reinterpret_cast<RTP *>(message->data())->ssrc();
+				return;
+			}
+			PLOG_VERBOSE << "Unprotected SRTP packet, size=" << size;
+			message->type = Message::Type::Binary;
+			message->stream = reinterpret_cast<RTP *>(message->data())->ssrc();
+		}
+
+		message->resize(size);
+		mSrtpRecvCallback(message);
+
+	} else {
+		PLOG_WARNING << "Unknown packet type, value=" << unsigned(value1) << ", size=" << size;
+	}
+}
+
+void DtlsSrtpTransport::postHandshake() {
+	if (mInitDone)
+		return;
+
+	static_assert(SRTP_AES_ICM_128_KEY_LEN_WSALT == SRTP_AES_128_KEY_LEN + SRTP_SALT_LEN);
+
+	const size_t materialLen = SRTP_AES_ICM_128_KEY_LEN_WSALT * 2;
+	unsigned char material[materialLen];
+	const unsigned char *clientKey, *clientSalt, *serverKey, *serverSalt;
+
+#if USE_GNUTLS
+	PLOG_INFO << "Deriving SRTP keying material (GnuTLS)";
+
+	gnutls_datum_t clientKeyDatum, clientSaltDatum, serverKeyDatum, serverSaltDatum;
+	gnutls::check(gnutls_srtp_get_keys(mSession, material, materialLen, &clientKeyDatum,
+	                                   &clientSaltDatum, &serverKeyDatum, &serverSaltDatum),
+	              "Failed to derive SRTP keys");
+
+	if (clientKeyDatum.size != SRTP_AES_128_KEY_LEN)
+		throw std::logic_error("Unexpected SRTP master key length: " +
+		                       to_string(clientKeyDatum.size));
+	if (clientSaltDatum.size != SRTP_SALT_LEN)
+		throw std::logic_error("Unexpected SRTP salt length: " + to_string(clientSaltDatum.size));
+	if (serverKeyDatum.size != SRTP_AES_128_KEY_LEN)
+		throw std::logic_error("Unexpected SRTP master key length: " +
+		                       to_string(serverKeyDatum.size));
+	if (serverSaltDatum.size != SRTP_SALT_LEN)
+		throw std::logic_error("Unexpected SRTP salt size: " + to_string(serverSaltDatum.size));
+
+	clientKey = reinterpret_cast<const unsigned char *>(clientKeyDatum.data);
+	clientSalt = reinterpret_cast<const unsigned char *>(clientSaltDatum.data);
+
+	serverKey = reinterpret_cast<const unsigned char *>(serverKeyDatum.data);
+	serverSalt = reinterpret_cast<const unsigned char *>(serverSaltDatum.data);
+#else
+	PLOG_INFO << "Deriving SRTP keying material (OpenSSL)";
+
+	// The extractor provides the client write master key, the server write master key, the client
+	// write master salt and the server write master salt in that order.
+	const string label = "EXTRACTOR-dtls_srtp";
+
+	// returns 1 on success, 0 or -1 on failure (OpenSSL API is a complete mess...)
+	if (SSL_export_keying_material(mSsl, material, materialLen, label.c_str(), label.size(),
+	                               nullptr, 0, 0) <= 0)
+		throw std::runtime_error("Failed to derive SRTP keys: " +
+		                         openssl::error_string(ERR_get_error()));
+
+	// Order is client key, server key, client salt, and server salt
+	clientKey = material;
+	serverKey = clientKey + SRTP_AES_128_KEY_LEN;
+	clientSalt = serverKey + SRTP_AES_128_KEY_LEN;
+	serverSalt = clientSalt + SRTP_SALT_LEN;
+#endif
+
+	std::memcpy(mClientSessionKey, clientKey, SRTP_AES_128_KEY_LEN);
+	std::memcpy(mClientSessionKey + SRTP_AES_128_KEY_LEN, clientSalt, SRTP_SALT_LEN);
+
+	std::memcpy(mServerSessionKey, serverKey, SRTP_AES_128_KEY_LEN);
+	std::memcpy(mServerSessionKey + SRTP_AES_128_KEY_LEN, serverSalt, SRTP_SALT_LEN);
+
+	// Add SSRC=1 as an inbound because that is what Chrome does.
+	srtp_policy_t inbound = {};
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtp);
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtcp);
+	inbound.ssrc.type = ssrc_specific;
+	inbound.ssrc.value = 1;
+	inbound.key = mIsClient ? mServerSessionKey : mClientSessionKey;
+	inbound.next = nullptr;
+
+	if (srtp_err_status_t err = srtp_add_stream(mSrtpIn, &inbound)) {
+		throw std::runtime_error("SRTP add inbound stream failed, status=" +
+		                         to_string(static_cast<int>(err)));
+	}
+
+	mInitDone = true;
+}
+
+void DtlsSrtpTransport::addSSRC(uint32_t ssrc) {
+	if (!mInitDone)
+		throw std::logic_error("Attempted to add SSRC before SRTP keying material is derived");
+
+	srtp_policy_t inbound = {};
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtp);
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtcp);
+	inbound.ssrc.type = ssrc_specific;
+	inbound.ssrc.value = ssrc;
+	inbound.key = mIsClient ? mServerSessionKey : mClientSessionKey;
+	inbound.next = nullptr;
+	inbound.allow_repeat_tx = true;
+
+	if (srtp_err_status_t err = srtp_add_stream(mSrtpIn, &inbound))
+		throw std::runtime_error("SRTP add inbound stream failed, status=" +
+		                         to_string(static_cast<int>(err)));
+
+	srtp_policy_t outbound = {};
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtp);
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtcp);
+	outbound.ssrc.type = ssrc_specific;
+	outbound.ssrc.value = ssrc;
+	outbound.key = mIsClient ? mClientSessionKey : mServerSessionKey;
+	outbound.next = nullptr;
+	outbound.allow_repeat_tx = true;
+
+	if (srtp_err_status_t err = srtp_add_stream(mSrtpOut, &outbound))
+		throw std::runtime_error("SRTP add outbound stream failed, status=" +
+		                         to_string(static_cast<int>(err)));
+}
+
+} // namespace rtc
+
+#endif

src/dtlssrtptransport.hpp

@@ -0,0 +1,67 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_DTLS_SRTP_TRANSPORT_H
+#define RTC_DTLS_SRTP_TRANSPORT_H
+
+#include "dtlstransport.hpp"
+#include "include.hpp"
+
+#if RTC_ENABLE_MEDIA
+
+#if RTC_SYSTEM_SRTP
+#include <srtp2/srtp.h>
+#else
+#include "srtp.h"
+#endif
+
+#include <atomic>
+
+namespace rtc {
+
+class DtlsSrtpTransport final : public DtlsTransport {
+public:
+	static void Init();
+	static void Cleanup();
+
+	DtlsSrtpTransport(std::shared_ptr<IceTransport> lower, std::shared_ptr<Certificate> certificate,
+	                  verifier_callback verifierCallback, message_callback srtpRecvCallback,
+	                  state_callback stateChangeCallback);
+	~DtlsSrtpTransport();
+
+	bool sendMedia(message_ptr message);
+	void addSSRC(uint32_t ssrc);
+
+private:
+	void incoming(message_ptr message) override;
+	void postHandshake() override;
+
+	message_callback mSrtpRecvCallback;
+
+	srtp_t mSrtpIn, mSrtpOut;
+
+	std::atomic<bool> mInitDone = false;
+	unsigned char mClientSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
+	unsigned char mServerSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/dtlstransport.cpp

@@ -19,98 +19,210 @@
 #include "dtlstransport.hpp"
 #include "icetransport.hpp"
 
-#include <cassert>
+#include <chrono>
 #include <cstring>
 #include <exception>
+#include <iostream>
 
-#include <gnutls/dtls.h>
+#if !USE_GNUTLS
+#ifdef _WIN32
+#include <winsock2.h> // for timeval
+#else
+#include <sys/time.h> // for timeval
+#endif
+#endif
+
+using namespace std::chrono;
 
 using std::shared_ptr;
 using std::string;
-
+using std::unique_ptr;
-namespace {
+using std::weak_ptr;
-
-static bool check_gnutls(int ret, const string &message = "GnuTLS error") {
-	if (ret < 0) {
-		if (!gnutls_error_is_fatal(ret))
-			return false;
-		throw std::runtime_error(message + ": " + gnutls_strerror(ret));
-	}
-	return true;
-}
-
-} // namespace
 
 namespace rtc {
 
-using std::shared_ptr;
+#if USE_GNUTLS
 
-DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certificate> certificate,
+void DtlsTransport::Init() {
-                             verifier_callback verifier, ready_callback ready)
+	gnutls_global_init(); // optional
-    : Transport(lower), mCertificate(certificate), mVerifierCallback(std::move(verifier)),
+}
-      mReadyCallback(std::move(ready)) {
-	gnutls_certificate_set_verify_function(mCertificate->credentials(), CertificateCallback);
 
-	bool active = lower->role() == Description::Role::Active;
+void DtlsTransport::Cleanup() { gnutls_global_deinit(); }
-	unsigned int flags = GNUTLS_DATAGRAM | (active ? GNUTLS_CLIENT : GNUTLS_SERVER);
-	check_gnutls(gnutls_init(&mSession, flags));
 
-	const char *priorities = "SECURE128:-VERS-SSL3.0:-VERS-TLS1.0:-ARCFOUR-128";
+DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr certificate,
-	const char *err_pos = NULL;
+                             verifier_callback verifierCallback, state_callback stateChangeCallback)
-	check_gnutls(gnutls_priority_set_direct(mSession, priorities, &err_pos),
+    : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
-	             "Unable to set TLS priorities");
+      mVerifierCallback(std::move(verifierCallback)),
+      mIsClient(lower->role() == Description::Role::Active), mCurrentDscp(0) {
 
-	gnutls_session_set_ptr(mSession, this);
+	PLOG_DEBUG << "Initializing DTLS transport (GnuTLS)";
-	gnutls_transport_set_ptr(mSession, this);
-	gnutls_transport_set_push_function(mSession, WriteCallback);
-	gnutls_transport_set_pull_function(mSession, ReadCallback);
-	gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
 
-	check_gnutls(
+	gnutls_certificate_credentials_t creds = mCertificate->credentials();
-	    gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, mCertificate->credentials()));
+	gnutls_certificate_set_verify_function(creds, CertificateCallback);
 
-	mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
+	unsigned int flags = GNUTLS_DATAGRAM | (mIsClient ? GNUTLS_CLIENT : GNUTLS_SERVER);
+	gnutls::check(gnutls_init(&mSession, flags));
+
+	try {
+		// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
+		// Therefore, the DTLS layer MUST NOT use any compression algorithm.
+		// See https://tools.ietf.org/html/rfc8261#section-5
+		const char *priorities = "SECURE128:-VERS-SSL3.0:-ARCFOUR-128:-COMP-ALL:+COMP-NULL";
+		const char *err_pos = NULL;
+		gnutls::check(gnutls_priority_set_direct(mSession, priorities, &err_pos),
+		              "Failed to set TLS priorities");
+
+		gnutls::check(gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, creds));
+
+		gnutls_dtls_set_timeouts(mSession,
+		                         1000,   // 1s retransmission timeout recommended by RFC 6347
+		                         30000); // 30s total timeout
+		gnutls_handshake_set_timeout(mSession, 30000);
+
+		gnutls_session_set_ptr(mSession, this);
+		gnutls_transport_set_ptr(mSession, this);
+		gnutls_transport_set_push_function(mSession, WriteCallback);
+		gnutls_transport_set_pull_function(mSession, ReadCallback);
+		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
+
+	} catch (...) {
+		gnutls_deinit(mSession);
+		throw;
+	}
 }
 
 DtlsTransport::~DtlsTransport() {
-	mIncomingQueue.stop();
+	stop();
-	if (mRecvThread.joinable())
-		mRecvThread.join();
 
-	gnutls_bye(mSession, GNUTLS_SHUT_RDWR);
 	gnutls_deinit(mSession);
 }
 
-bool DtlsTransport::send(message_ptr message) {
+void DtlsTransport::start() {
-	while (true) {
+	Transport::start();
-		ssize_t ret = gnutls_record_send(mSession, message->data(), message->size());
+
-		if (check_gnutls(ret)) {
+	registerIncoming();
-			return ret > 0;
+
-		}
+	PLOG_DEBUG << "Starting DTLS recv thread";
-	}
+	mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
 }
 
-void DtlsTransport::incoming(message_ptr message) { mIncomingQueue.push(message); }
+bool DtlsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Stopping DTLS recv thread";
+	mIncomingQueue.stop();
+	mRecvThread.join();
+	return true;
+}
+
+bool DtlsTransport::send(message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+
+	mCurrentDscp = message->dscp;
+	ssize_t ret;
+	do {
+		ret = gnutls_record_send(mSession, message->data(), message->size());
+	} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+	if (ret == GNUTLS_E_LARGE_PACKET)
+		return false;
+
+	return gnutls::check(ret);
+}
+
+void DtlsTransport::incoming(message_ptr message) {
+	if (!message) {
+		mIncomingQueue.stop();
+		return;
+	}
+
+	PLOG_VERBOSE << "Incoming size=" << message->size();
+	mIncomingQueue.push(message);
+}
+
+bool DtlsTransport::outgoing(message_ptr message) {
+	if (message->dscp == 0)
+		message->dscp = mCurrentDscp;
+
+	return Transport::outgoing(std::move(message));
+}
+
+void DtlsTransport::postHandshake() {
+	// Dummy
+}
 
 void DtlsTransport::runRecvLoop() {
-	while (!check_gnutls(gnutls_handshake(mSession), "TLS handshake failed")) {}
+	const size_t maxMtu = 4096;
+	// Handshake loop
+	try {
+		changeState(State::Connecting);
+		gnutls_dtls_set_mtu(mSession, 1280 - 40 - 8); // min MTU over UDP/IPv6
 
-	mReadyCallback();
+		int ret;
+		do {
+			ret = gnutls_handshake(mSession);
 
-	const size_t bufferSize = 2048;
+			if (ret == GNUTLS_E_LARGE_PACKET)
-	char buffer[bufferSize];
+				throw std::runtime_error("MTU is too low");
 
-	while (true) {
+		} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ||
-		ssize_t ret = gnutls_record_recv(mSession, buffer, bufferSize);
+		         !gnutls::check(ret, "DTLS handshake failed"));
-		if (check_gnutls(ret)) {
+
-			if (ret == 0) {
+		// RFC 8261: DTLS MUST support sending messages larger than the current path MTU
-				// Closed
+		// See https://tools.ietf.org/html/rfc8261#section-5
+		gnutls_dtls_set_mtu(mSession, maxMtu + 1);
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "DTLS handshake: " << e.what();
+		changeState(State::Failed);
+		return;
+	}
+
+	// Receive loop
+	try {
+		PLOG_INFO << "DTLS handshake finished";
+		postHandshake();
+		changeState(State::Connected);
+
+		const size_t bufferSize = maxMtu;
+		char buffer[bufferSize];
+
+		while (true) {
+			ssize_t ret;
+			do {
+				ret = gnutls_record_recv(mSession, buffer, bufferSize);
+			} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+			// Consider premature termination as remote closing
+			if (ret == GNUTLS_E_PREMATURE_TERMINATION) {
+				PLOG_DEBUG << "DTLS connection terminated";
 				break;
 			}
-			auto *b = reinterpret_cast<byte *>(buffer);
+
-			recv(make_message(b, b + ret));
+			if (gnutls::check(ret)) {
+				if (ret == 0) {
+					// Closed
+					PLOG_DEBUG << "DTLS connection cleanly closed";
+					break;
+				}
+				auto *b = reinterpret_cast<byte *>(buffer);
+				recv(make_message(b, b + ret));
+			}
 		}
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "DTLS recv: " << e.what();
 	}
+
+	gnutls_bye(mSession, GNUTLS_SHUT_RDWR);
+
+	PLOG_INFO << "DTLS closed";
+	changeState(State::Disconnected);
+	recv(nullptr);
 }
 
 int DtlsTransport::CertificateCallback(gnutls_session_t session) {
@@ -120,7 +232,6 @@ int DtlsTransport::CertificateCallback(gnutls_session_t session) {
 		return GNUTLS_E_CERTIFICATE_ERROR;
 	}
 
-	// Get peer's certificate
 	unsigned int count = 0;
 	const gnutls_datum_t *array = gnutls_certificate_get_peers(session, &count);
 	if (!array || count == 0) {
@@ -128,7 +239,7 @@ int DtlsTransport::CertificateCallback(gnutls_session_t session) {
 	}
 
 	gnutls_x509_crt_t crt;
-	check_gnutls(gnutls_x509_crt_init(&crt));
+	gnutls::check(gnutls_x509_crt_init(&crt));
 	int ret = gnutls_x509_crt_import(crt, &array[0], GNUTLS_X509_FMT_DER);
 	if (ret != GNUTLS_E_SUCCESS) {
 		gnutls_x509_crt_deinit(crt);
@@ -154,22 +265,329 @@ ssize_t DtlsTransport::WriteCallback(gnutls_transport_ptr_t ptr, const void *dat
 
 ssize_t DtlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen) {
 	DtlsTransport *t = static_cast<DtlsTransport *>(ptr);
-	auto next = t->mIncomingQueue.pop();
+	if (auto next = t->mIncomingQueue.pop()) {
-	if (!next) {
+		message_ptr message = std::move(*next);
-		// Closed
+		ssize_t len = std::min(maxlen, message->size());
+		std::memcpy(data, message->data(), len);
 		gnutls_transport_set_errno(t->mSession, 0);
-		return 0;
+		return len;
 	}
-
+	// Closed
-	auto message = *next;
-	ssize_t len = std::min(maxlen, message->size());
-	std::memcpy(data, message->data(), len);
 	gnutls_transport_set_errno(t->mSession, 0);
-	return len;
+	return 0;
 }
 
 int DtlsTransport::TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms) {
-	return 1; // So ReadCallback is called
+	DtlsTransport *t = static_cast<DtlsTransport *>(ptr);
+	bool notEmpty = t->mIncomingQueue.wait(
+	    ms != GNUTLS_INDEFINITE_TIMEOUT ? std::make_optional(milliseconds(ms)) : nullopt);
+	return notEmpty ? 1 : 0;
 }
 
+#else // USE_GNUTLS==0
+
+BIO_METHOD *DtlsTransport::BioMethods = NULL;
+int DtlsTransport::TransportExIndex = -1;
+std::mutex DtlsTransport::GlobalMutex;
+
+void DtlsTransport::Init() {
+	std::lock_guard lock(GlobalMutex);
+
+	openssl::init();
+
+	if (!BioMethods) {
+		BioMethods = BIO_meth_new(BIO_TYPE_BIO, "DTLS writer");
+		if (!BioMethods)
+			throw std::runtime_error("Failed to create BIO methods for DTLS writer");
+		BIO_meth_set_create(BioMethods, BioMethodNew);
+		BIO_meth_set_destroy(BioMethods, BioMethodFree);
+		BIO_meth_set_write(BioMethods, BioMethodWrite);
+		BIO_meth_set_ctrl(BioMethods, BioMethodCtrl);
+	}
+	if (TransportExIndex < 0) {
+		TransportExIndex = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL);
+	}
+}
+
+void DtlsTransport::Cleanup() {
+	// Nothing to do
+}
+
+DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certificate> certificate,
+                             verifier_callback verifierCallback, state_callback stateChangeCallback)
+    : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
+      mVerifierCallback(std::move(verifierCallback)),
+      mIsClient(lower->role() == Description::Role::Active), mCurrentDscp(0) {
+	PLOG_DEBUG << "Initializing DTLS transport (OpenSSL)";
+
+	try {
+		mCtx = SSL_CTX_new(DTLS_method());
+		if (!mCtx)
+			throw std::runtime_error("Failed to create SSL context");
+
+		openssl::check(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
+		               "Failed to set SSL priorities");
+
+		// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
+		// Therefore, the DTLS layer MUST NOT use any compression algorithm.
+		// See https://tools.ietf.org/html/rfc8261#section-5
+		SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3 | SSL_OP_NO_COMPRESSION | SSL_OP_NO_QUERY_MTU);
+		SSL_CTX_set_min_proto_version(mCtx, DTLS1_VERSION);
+		SSL_CTX_set_read_ahead(mCtx, 1);
+		SSL_CTX_set_quiet_shutdown(mCtx, 1);
+		SSL_CTX_set_info_callback(mCtx, InfoCallback);
+		SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+		                   CertificateCallback);
+		SSL_CTX_set_verify_depth(mCtx, 1);
+
+		auto [x509, pkey] = mCertificate->credentials();
+		SSL_CTX_use_certificate(mCtx, x509);
+		SSL_CTX_use_PrivateKey(mCtx, pkey);
+
+		openssl::check(SSL_CTX_check_private_key(mCtx), "SSL local private key check failed");
+
+		mSsl = SSL_new(mCtx);
+		if (!mSsl)
+			throw std::runtime_error("Failed to create SSL instance");
+
+		SSL_set_ex_data(mSsl, TransportExIndex, this);
+
+		if (mIsClient)
+			SSL_set_connect_state(mSsl);
+		else
+			SSL_set_accept_state(mSsl);
+
+		mInBio = BIO_new(BIO_s_mem());
+		mOutBio = BIO_new(BioMethods);
+		if (!mInBio || !mOutBio)
+			throw std::runtime_error("Failed to create BIO");
+
+		BIO_set_mem_eof_return(mInBio, BIO_EOF);
+		BIO_set_data(mOutBio, this);
+		SSL_set_bio(mSsl, mInBio, mOutBio);
+
+		auto ecdh = unique_ptr<EC_KEY, decltype(&EC_KEY_free)>(
+		    EC_KEY_new_by_curve_name(NID_X9_62_prime256v1), EC_KEY_free);
+		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
+		SSL_set_tmp_ecdh(mSsl, ecdh.get());
+
+	} catch (...) {
+		if (mSsl)
+			SSL_free(mSsl);
+		if (mCtx)
+			SSL_CTX_free(mCtx);
+		throw;
+	}
+}
+
+DtlsTransport::~DtlsTransport() {
+	stop();
+
+	SSL_free(mSsl);
+	SSL_CTX_free(mCtx);
+}
+
+void DtlsTransport::start() {
+	Transport::start();
+
+	registerIncoming();
+
+	PLOG_DEBUG << "Starting DTLS recv thread";
+	mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
+}
+
+bool DtlsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Stopping DTLS recv thread";
+	mIncomingQueue.stop();
+	mRecvThread.join();
+	SSL_shutdown(mSsl);
+	return true;
+}
+
+bool DtlsTransport::send(message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+
+	mCurrentDscp = message->dscp;
+	int ret = SSL_write(mSsl, message->data(), int(message->size()));
+	return openssl::check(mSsl, ret);
+}
+
+void DtlsTransport::incoming(message_ptr message) {
+	if (!message) {
+		mIncomingQueue.stop();
+		return;
+	}
+
+	PLOG_VERBOSE << "Incoming size=" << message->size();
+	mIncomingQueue.push(message);
+}
+
+bool DtlsTransport::outgoing(message_ptr message) {
+	if (message->dscp == 0)
+		message->dscp = mCurrentDscp;
+
+	return Transport::outgoing(std::move(message));
+}
+
+void DtlsTransport::postHandshake() {
+	// Dummy
+}
+
+void DtlsTransport::runRecvLoop() {
+	const size_t maxMtu = 4096;
+	try {
+		changeState(State::Connecting);
+		SSL_set_mtu(mSsl, 1280 - 40 - 8); // min MTU over UDP/IPv6
+
+		// Initiate the handshake
+		int ret = SSL_do_handshake(mSsl);
+		openssl::check(mSsl, ret, "Handshake failed");
+
+		const size_t bufferSize = maxMtu;
+		byte buffer[bufferSize];
+		while (mIncomingQueue.running()) {
+			// Process pending messages
+			while (auto next = mIncomingQueue.tryPop()) {
+				message_ptr message = std::move(*next);
+				BIO_write(mInBio, message->data(), int(message->size()));
+
+				if (state() == State::Connecting) {
+					// Continue the handshake
+					ret = SSL_do_handshake(mSsl);
+					if (!openssl::check(mSsl, ret, "Handshake failed"))
+						break;
+
+					if (SSL_is_init_finished(mSsl)) {
+						// RFC 8261: DTLS MUST support sending messages larger than the current path
+						// MTU See https://tools.ietf.org/html/rfc8261#section-5
+						SSL_set_mtu(mSsl, maxMtu + 1);
+
+						PLOG_INFO << "DTLS handshake finished";
+						postHandshake();
+						changeState(State::Connected);
+					}
+				} else {
+					ret = SSL_read(mSsl, buffer, bufferSize);
+					if (!openssl::check(mSsl, ret))
+						break;
+
+					if (ret > 0)
+						recv(make_message(buffer, buffer + ret));
+				}
+			}
+
+			// No more messages pending, retransmit and rearm timeout if connecting
+			std::optional<milliseconds> duration;
+			if (state() == State::Connecting) {
+				// Warning: This function breaks the usual return value convention
+				ret = DTLSv1_handle_timeout(mSsl);
+				if (ret < 0) {
+					throw std::runtime_error("Handshake timeout"); // write BIO can't fail
+				} else if (ret > 0) {
+					LOG_VERBOSE << "OpenSSL did DTLS retransmit";
+				}
+
+				struct timeval timeout = {};
+				if (state() == State::Connecting && DTLSv1_get_timeout(mSsl, &timeout)) {
+					duration = milliseconds(timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
+					// Also handle handshake timeout manually because OpenSSL actually doesn't...
+					// OpenSSL backs off exponentially in base 2 starting from the recommended 1s
+					// so this allows for 5 retransmissions and fails after roughly 30s.
+					if (duration > 30s) {
+						throw std::runtime_error("Handshake timeout");
+					} else {
+						LOG_VERBOSE << "OpenSSL DTLS retransmit timeout is " << duration->count()
+						            << "ms";
+					}
+				}
+			}
+
+			mIncomingQueue.wait(duration);
+		}
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "DTLS recv: " << e.what();
+	}
+
+	if (state() == State::Connected) {
+		PLOG_INFO << "DTLS closed";
+		changeState(State::Disconnected);
+		recv(nullptr);
+	} else {
+		PLOG_ERROR << "DTLS handshake failed";
+		changeState(State::Failed);
+	}
+}
+
+int DtlsTransport::CertificateCallback(int /*preverify_ok*/, X509_STORE_CTX *ctx) {
+	SSL *ssl =
+	    static_cast<SSL *>(X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx()));
+	DtlsTransport *t =
+	    static_cast<DtlsTransport *>(SSL_get_ex_data(ssl, DtlsTransport::TransportExIndex));
+
+	X509 *crt = X509_STORE_CTX_get_current_cert(ctx);
+	string fingerprint = make_fingerprint(crt);
+
+	return t->mVerifierCallback(fingerprint) ? 1 : 0;
+}
+
+void DtlsTransport::InfoCallback(const SSL *ssl, int where, int ret) {
+	DtlsTransport *t =
+	    static_cast<DtlsTransport *>(SSL_get_ex_data(ssl, DtlsTransport::TransportExIndex));
+
+	if (where & SSL_CB_ALERT) {
+		if (ret != 256) { // Close Notify
+			PLOG_ERROR << "DTLS alert: " << SSL_alert_desc_string_long(ret);
+		}
+		t->mIncomingQueue.stop(); // Close the connection
+	}
+}
+
+int DtlsTransport::BioMethodNew(BIO *bio) {
+	BIO_set_init(bio, 1);
+	BIO_set_data(bio, NULL);
+	BIO_set_shutdown(bio, 0);
+	return 1;
+}
+
+int DtlsTransport::BioMethodFree(BIO *bio) {
+	if (!bio)
+		return 0;
+	BIO_set_data(bio, NULL);
+	return 1;
+}
+
+int DtlsTransport::BioMethodWrite(BIO *bio, const char *in, int inl) {
+	if (inl <= 0)
+		return inl;
+	auto transport = reinterpret_cast<DtlsTransport *>(BIO_get_data(bio));
+	if (!transport)
+		return -1;
+	auto b = reinterpret_cast<const byte *>(in);
+	transport->outgoing(make_message(b, b + inl));
+	return inl; // can't fail
+}
+
+long DtlsTransport::BioMethodCtrl(BIO * /*bio*/, int cmd, long /*num*/, void * /*ptr*/) {
+	switch (cmd) {
+	case BIO_CTRL_FLUSH:
+		return 1;
+	case BIO_CTRL_DGRAM_QUERY_MTU:
+		return 0; // SSL_OP_NO_QUERY_MTU must be set
+	case BIO_CTRL_WPENDING:
+	case BIO_CTRL_PENDING:
+		return 0;
+	default:
+		break;
+	}
+	return 0;
+}
+
+#endif
+
 } // namespace rtc

src/dtlstransport.hpp

@@ -23,48 +23,74 @@
 #include "include.hpp"
 #include "peerconnection.hpp"
 #include "queue.hpp"
+#include "tls.hpp"
 #include "transport.hpp"
 
+#include <atomic>
 #include <functional>
 #include <memory>
+#include <mutex>
 #include <thread>
 
-#include <gnutls/gnutls.h>
-
 namespace rtc {
 
 class IceTransport;
 
 class DtlsTransport : public Transport {
 public:
-	using verifier_callback = std::function<bool(const std::string &fingerprint)>;
+	static void Init();
-	using ready_callback = std::function<void(void)>;
+	static void Cleanup();
 
-	DtlsTransport(std::shared_ptr<IceTransport> lower, std::shared_ptr<Certificate> certificate,
+	using verifier_callback = std::function<bool(const std::string &fingerprint)>;
-	              verifier_callback verifier, ready_callback ready);
+
+	DtlsTransport(std::shared_ptr<IceTransport> lower, certificate_ptr certificate,
+	              verifier_callback verifierCallback, state_callback stateChangeCallback);
 	~DtlsTransport();
 
-	bool send(message_ptr message);
+	virtual void start() override;
+	virtual bool stop() override;
+	virtual bool send(message_ptr message) override; // false if dropped
 
-private:
+protected:
-	void incoming(message_ptr message);
+	virtual void incoming(message_ptr message) override;
+	virtual bool outgoing(message_ptr message) override;
+	virtual void postHandshake();
 	void runRecvLoop();
 
-	const std::shared_ptr<Certificate> mCertificate;
+	const certificate_ptr mCertificate;
+	const verifier_callback mVerifierCallback;
+	const bool mIsClient;
 
-	gnutls_session_t mSession;
 	Queue<message_ptr> mIncomingQueue;
 	std::thread mRecvThread;
-	verifier_callback mVerifierCallback;
+	std::atomic<unsigned int> mCurrentDscp;
-	ready_callback mReadyCallback;
+
+#if USE_GNUTLS
+	gnutls_session_t mSession;
 
 	static int CertificateCallback(gnutls_session_t session);
 	static ssize_t WriteCallback(gnutls_transport_ptr_t ptr, const void *data, size_t len);
 	static ssize_t ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen);
 	static int TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms);
+#else
+	SSL_CTX *mCtx = NULL;
+	SSL *mSsl = NULL;
+	BIO *mInBio, *mOutBio;
+
+	static BIO_METHOD *BioMethods;
+	static int TransportExIndex;
+	static std::mutex GlobalMutex;
+
+	static int CertificateCallback(int preverify_ok, X509_STORE_CTX *ctx);
+	static void InfoCallback(const SSL *ssl, int where, int ret);
+
+	static int BioMethodNew(BIO *bio);
+	static int BioMethodFree(BIO *bio);
+	static int BioMethodWrite(BIO *bio, const char *in, int inl);
+	static long BioMethodCtrl(BIO *bio, int cmd, long num, void *ptr);
+#endif
 };
 
 } // namespace rtc
 
 #endif
-

src/icetransport.cpp

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2019 Paul-Louis Ageneau
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -17,36 +17,338 @@
  */
 
 #include "icetransport.hpp"
+#include "configuration.hpp"
+#include "transport.hpp"
 
-#include <netdb.h>
-#include <netinet/in.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-
-#include <chrono>
 #include <iostream>
 #include <random>
 #include <sstream>
 
-namespace rtc {
+#ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#else
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#endif
+
+#include <sys/types.h>
+
+using namespace std::chrono_literals;
 
 using std::shared_ptr;
 using std::weak_ptr;
+using std::chrono::system_clock;
 
-IceTransport::IceTransport(const Configuration &config, Description::Role role,
+#if !USE_NICE
-                           candidate_callback candidateCallback, ready_callback ready)
-    : mRole(role), mMid("0"), mState(State::Disconnected), mNiceAgent(nullptr, nullptr),
-      mMainLoop(nullptr, nullptr), mCandidateCallback(std::move(candidateCallback)),
-      mReadyCallback(ready) {
 
-	auto logLevelFlags = GLogLevelFlags(G_LOG_LEVEL_MASK | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION);
+namespace rtc {
-	g_log_set_handler(nullptr, logLevelFlags, LogCallback, this);
+
-	nice_debug_enable(false);
+IceTransport::IceTransport(const Configuration &config, candidate_callback candidateCallback,
+                           state_callback stateChangeCallback,
+                           gathering_state_callback gatheringStateChangeCallback)
+    : Transport(nullptr, std::move(stateChangeCallback)), mRole(Description::Role::ActPass),
+      mMid("0"), mGatheringState(GatheringState::New),
+      mCandidateCallback(std::move(candidateCallback)),
+      mGatheringStateChangeCallback(std::move(gatheringStateChangeCallback)),
+      mAgent(nullptr, nullptr) {
+
+	PLOG_DEBUG << "Initializing ICE transport (libjuice)";
+	if (config.enableIceTcp) {
+		PLOG_WARNING << "ICE-TCP is not supported with libjuice";
+	}
+
+	juice_log_level_t level;
+	auto logger = plog::get();
+	switch (logger ? logger->getMaxSeverity() : plog::none) {
+	case plog::none:
+		level = JUICE_LOG_LEVEL_NONE;
+		break;
+	case plog::fatal:
+		level = JUICE_LOG_LEVEL_VERBOSE;
+		break;
+	case plog::error:
+		level = JUICE_LOG_LEVEL_ERROR;
+		break;
+	case plog::warning:
+		level = JUICE_LOG_LEVEL_WARN;
+		break;
+	case plog::info:
+	case plog::debug: // juice debug is output as verbose
+		level = JUICE_LOG_LEVEL_INFO;
+		break;
+	default:
+		level = JUICE_LOG_LEVEL_VERBOSE;
+		break;
+	}
+	juice_set_log_handler(IceTransport::LogCallback);
+	juice_set_log_level(level);
+
+	juice_config_t jconfig = {};
+	jconfig.cb_state_changed = IceTransport::StateChangeCallback;
+	jconfig.cb_candidate = IceTransport::CandidateCallback;
+	jconfig.cb_gathering_done = IceTransport::GatheringDoneCallback;
+	jconfig.cb_recv = IceTransport::RecvCallback;
+	jconfig.user_ptr = this;
+
+	// Randomize servers order
+	std::vector<IceServer> servers = config.iceServers;
+	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
+	std::shuffle(servers.begin(), servers.end(), std::default_random_engine(seed));
+
+	// Pick a STUN server (TURN support is not implemented in libjuice yet)
+	for (auto &server : servers) {
+		if (!server.hostname.empty() && server.type == IceServer::Type::Stun) {
+			if (server.service.empty())
+				server.service = "3478"; // STUN UDP port
+			PLOG_DEBUG << "Using STUN server \"" << server.hostname << ":" << server.service
+			           << "\"";
+			mStunHostname = server.hostname;
+			mStunService = server.service;
+			jconfig.stun_server_host = mStunHostname.c_str();
+			jconfig.stun_server_port = uint16_t(std::stoul(mStunService));
+			break;
+		}
+	}
+
+	// Port range
+	if (config.portRangeBegin > 1024 ||
+	    (config.portRangeEnd != 0 && config.portRangeEnd != 65535)) {
+		jconfig.local_port_range_begin = config.portRangeBegin;
+		jconfig.local_port_range_end = config.portRangeEnd;
+	}
+
+	// Create agent
+	mAgent = decltype(mAgent)(juice_create(&jconfig), juice_destroy);
+	if (!mAgent)
+		throw std::runtime_error("Failed to create the ICE agent");
+}
+
+IceTransport::~IceTransport() {
+	stop();
+	mAgent.reset();
+}
+
+bool IceTransport::stop() { return Transport::stop(); }
+
+Description::Role IceTransport::role() const { return mRole; }
+
+Description IceTransport::getLocalDescription(Description::Type type) const {
+	char sdp[JUICE_MAX_SDP_STRING_LEN];
+	if (juice_get_local_description(mAgent.get(), sdp, JUICE_MAX_SDP_STRING_LEN) < 0)
+		throw std::runtime_error("Failed to generate local SDP");
+
+	// RFC 5763: The endpoint that is the offerer MUST use the setup attribute value of
+	// setup:actpass.
+	// See https://tools.ietf.org/html/rfc5763#section-5
+	return Description(string(sdp), type,
+	                   type == Description::Type::Offer ? Description::Role::ActPass : mRole);
+}
+
+void IceTransport::setRemoteDescription(const Description &description) {
+	if (mRole == Description::Role::ActPass)
+		mRole = description.role() == Description::Role::Active ? Description::Role::Passive
+		                                                        : Description::Role::Active;
+	if (mRole == description.role())
+		throw std::logic_error("Incompatible roles with remote description");
+
+	mMid = description.bundleMid();
+	if (juice_set_remote_description(mAgent.get(),
+	                                 description.generateApplicationSdp("\r\n").c_str()) < 0)
+		throw std::runtime_error("Failed to parse ICE settings from remote SDP");
+}
+
+bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
+	// Don't try to pass unresolved candidates for more safety
+	if (!candidate.isResolved())
+		return false;
+
+	return juice_add_remote_candidate(mAgent.get(), string(candidate).c_str()) >= 0;
+}
+
+void IceTransport::gatherLocalCandidates(string mid) {
+	mMid = std::move(mid);
+
+	// Change state now as candidates calls can be synchronous
+	changeGatheringState(GatheringState::InProgress);
+
+	if (juice_gather_candidates(mAgent.get()) < 0) {
+		throw std::runtime_error("Failed to gather local ICE candidates");
+	}
+}
+
+std::optional<string> IceTransport::getLocalAddress() const {
+	char str[JUICE_MAX_ADDRESS_STRING_LEN];
+	if (juice_get_selected_addresses(mAgent.get(), str, JUICE_MAX_ADDRESS_STRING_LEN, NULL, 0) ==
+	    0) {
+		return std::make_optional(string(str));
+	}
+	return nullopt;
+}
+std::optional<string> IceTransport::getRemoteAddress() const {
+	char str[JUICE_MAX_ADDRESS_STRING_LEN];
+	if (juice_get_selected_addresses(mAgent.get(), NULL, 0, str, JUICE_MAX_ADDRESS_STRING_LEN) ==
+	    0) {
+		return std::make_optional(string(str));
+	}
+	return nullopt;
+}
+
+bool IceTransport::getSelectedCandidatePair(Candidate *local, Candidate *remote) {
+	char sdpLocal[JUICE_MAX_CANDIDATE_SDP_STRING_LEN];
+	char sdpRemote[JUICE_MAX_CANDIDATE_SDP_STRING_LEN];
+	if (juice_get_selected_candidates(mAgent.get(), sdpLocal, JUICE_MAX_CANDIDATE_SDP_STRING_LEN,
+	                                  sdpRemote, JUICE_MAX_CANDIDATE_SDP_STRING_LEN) == 0) {
+		if (local) {
+			*local = Candidate(sdpLocal, mMid);
+			local->resolve(Candidate::ResolveMode::Simple);
+		}
+		if (remote) {
+			*remote = Candidate(sdpRemote, mMid);
+			remote->resolve(Candidate::ResolveMode::Simple);
+		}
+		return true;
+	}
+	return false;
+}
+
+bool IceTransport::send(message_ptr message) {
+	auto s = state();
+	if (!message || (s != State::Connected && s != State::Completed))
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+	return outgoing(message);
+}
+
+bool IceTransport::outgoing(message_ptr message) {
+	// Explicit Congestion Notification takes the least-significant 2 bits of the DS field
+	int ds = int(message->dscp << 2);
+	return juice_send_diffserv(mAgent.get(), reinterpret_cast<const char *>(message->data()),
+	                           message->size(), ds) >= 0;
+}
+
+void IceTransport::changeGatheringState(GatheringState state) {
+	if (mGatheringState.exchange(state) != state)
+		mGatheringStateChangeCallback(mGatheringState);
+}
+
+void IceTransport::processStateChange(unsigned int state) {
+	switch (state) {
+	case JUICE_STATE_DISCONNECTED:
+		changeState(State::Disconnected);
+		break;
+	case JUICE_STATE_CONNECTING:
+		changeState(State::Connecting);
+		break;
+	case JUICE_STATE_CONNECTED:
+		changeState(State::Connected);
+		break;
+	case JUICE_STATE_COMPLETED:
+		changeState(State::Completed);
+		break;
+	case JUICE_STATE_FAILED:
+		changeState(State::Failed);
+		break;
+	};
+}
+
+void IceTransport::processCandidate(const string &candidate) {
+	mCandidateCallback(Candidate(candidate, mMid));
+}
+
+void IceTransport::processGatheringDone() { changeGatheringState(GatheringState::Complete); }
+
+void IceTransport::StateChangeCallback(juice_agent_t *, juice_state_t state, void *user_ptr) {
+	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
+	try {
+		iceTransport->processStateChange(static_cast<unsigned int>(state));
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
+}
+
+void IceTransport::CandidateCallback(juice_agent_t *, const char *sdp, void *user_ptr) {
+	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
+	try {
+		iceTransport->processCandidate(sdp);
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
+}
+
+void IceTransport::GatheringDoneCallback(juice_agent_t *, void *user_ptr) {
+	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
+	try {
+		iceTransport->processGatheringDone();
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
+}
+
+void IceTransport::RecvCallback(juice_agent_t *, const char *data, size_t size, void *user_ptr) {
+	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
+	try {
+		PLOG_VERBOSE << "Incoming size=" << size;
+		auto b = reinterpret_cast<const byte *>(data);
+		iceTransport->incoming(make_message(b, b + size));
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
+}
+
+void IceTransport::LogCallback(juice_log_level_t level, const char *message) {
+	plog::Severity severity;
+	switch (level) {
+	case JUICE_LOG_LEVEL_FATAL:
+		severity = plog::fatal;
+		break;
+	case JUICE_LOG_LEVEL_ERROR:
+		severity = plog::error;
+		break;
+	case JUICE_LOG_LEVEL_WARN:
+		severity = plog::warning;
+		break;
+	case JUICE_LOG_LEVEL_INFO:
+		severity = plog::info;
+		break;
+	default:
+		severity = plog::verbose; // libjuice debug as verbose
+		break;
+	}
+	PLOG(severity) << "juice: " << message;
+}
+
+} // namespace rtc
+
+#else // USE_NICE == 1
+
+namespace rtc {
+
+IceTransport::IceTransport(const Configuration &config, candidate_callback candidateCallback,
+                           state_callback stateChangeCallback,
+                           gathering_state_callback gatheringStateChangeCallback)
+    : Transport(nullptr, std::move(stateChangeCallback)), mRole(Description::Role::ActPass),
+      mMid("0"), mGatheringState(GatheringState::New),
+      mCandidateCallback(std::move(candidateCallback)),
+      mGatheringStateChangeCallback(std::move(gatheringStateChangeCallback)),
+      mNiceAgent(nullptr, nullptr), mMainLoop(nullptr, nullptr), mOutgoingDscp(0) {
+
+	PLOG_DEBUG << "Initializing ICE transport (libnice)";
+
+	g_log_set_handler("libnice", G_LOG_LEVEL_MASK, LogCallback, this);
+
+	IF_PLOG(plog::verbose) {
+		nice_debug_enable(false); // do not output STUN debug messages
+	}
 
 	mMainLoop = decltype(mMainLoop)(g_main_loop_new(nullptr, FALSE), g_main_loop_unref);
 	if (!mMainLoop)
 		std::runtime_error("Failed to create the main loop");
 
+	// RFC 5245 was obsoleted by RFC 8445 but this should be OK.
 	mNiceAgent = decltype(mNiceAgent)(
 	    nice_agent_new(g_main_loop_get_context(mMainLoop.get()), NICE_COMPATIBILITY_RFC5245),
 	    g_object_unref);
@@ -55,19 +357,51 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 		throw std::runtime_error("Failed to create the nice agent");
 
 	mMainLoopThread = std::thread(g_main_loop_run, mMainLoop.get());
-	g_object_set(G_OBJECT(mNiceAgent.get()), "upnp", FALSE, nullptr);
-	g_object_set(G_OBJECT(mNiceAgent.get()), "controlling-mode", FALSE, nullptr);
-	g_object_set(G_OBJECT(mNiceAgent.get()), "ice-udp", TRUE, nullptr);
-	g_object_set(G_OBJECT(mNiceAgent.get()), "ice-tcp", FALSE, nullptr);
 
+	mStreamId = nice_agent_add_stream(mNiceAgent.get(), 1);
+	if (!mStreamId)
+		throw std::runtime_error("Failed to add a stream");
+
+	g_object_set(G_OBJECT(mNiceAgent.get()), "controlling-mode", TRUE, nullptr); // decided later
+	g_object_set(G_OBJECT(mNiceAgent.get()), "ice-udp", TRUE, nullptr);
+	g_object_set(G_OBJECT(mNiceAgent.get()), "ice-tcp", config.enableIceTcp ? TRUE : FALSE,
+	             nullptr);
+
+	// RFC 8445: Agents MUST NOT use an RTO value smaller than 500 ms.
+	g_object_set(G_OBJECT(mNiceAgent.get()), "stun-initial-timeout", 500, nullptr);
+	g_object_set(G_OBJECT(mNiceAgent.get()), "stun-max-retransmissions", 3, nullptr);
+
+	// RFC 8445: ICE agents SHOULD use a default Ta value, 50 ms, but MAY use another value based on
+	// the characteristics of the associated data.
+	g_object_set(G_OBJECT(mNiceAgent.get()), "stun-pacing-timer", 25, nullptr);
+
+	g_object_set(G_OBJECT(mNiceAgent.get()), "upnp", FALSE, nullptr);
+	g_object_set(G_OBJECT(mNiceAgent.get()), "upnp-timeout", 200, nullptr);
+
+	// Proxy
+	if (config.proxyServer.has_value()) {
+		ProxyServer proxyServer = config.proxyServer.value();
+		g_object_set(G_OBJECT(mNiceAgent.get()), "proxy-type", proxyServer.type, nullptr);
+		g_object_set(G_OBJECT(mNiceAgent.get()), "proxy-ip", proxyServer.ip.c_str(), nullptr);
+		g_object_set(G_OBJECT(mNiceAgent.get()), "proxy-port", proxyServer.port, nullptr);
+		g_object_set(G_OBJECT(mNiceAgent.get()), "proxy-username", proxyServer.username.c_str(),
+		             nullptr);
+		g_object_set(G_OBJECT(mNiceAgent.get()), "proxy-password", proxyServer.password.c_str(),
+		             nullptr);
+	}
+
+	// Randomize order
 	std::vector<IceServer> servers = config.iceServers;
-	unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
+	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 	std::shuffle(servers.begin(), servers.end(), std::default_random_engine(seed));
 
+	// Add one STUN server
 	bool success = false;
 	for (auto &server : servers) {
 		if (server.hostname.empty())
 			continue;
+		if (server.type != IceServer::Type::Stun)
+			continue;
 		if (server.service.empty())
 			server.service = "3478"; // STUN UDP port
 
@@ -77,8 +411,11 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 		hints.ai_protocol = IPPROTO_UDP;
 		hints.ai_flags = AI_ADDRCONFIG;
 		struct addrinfo *result = nullptr;
-		if (getaddrinfo(server.hostname.c_str(), server.service.c_str(), &hints, &result) != 0)
+		if (getaddrinfo(server.hostname.c_str(), server.service.c_str(), &hints, &result) != 0) {
+			PLOG_WARNING << "Unable to resolve STUN server address: " << server.hostname << ':'
+			             << server.service;
 			continue;
+		}
 
 		for (auto p = result; p; p = p->ai_next) {
 			if (p->ai_family == AF_INET) {
@@ -87,6 +424,8 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 				if (getnameinfo(p->ai_addr, p->ai_addrlen, nodebuffer, MAX_NUMERICNODE_LEN,
 				                servbuffer, MAX_NUMERICNODE_LEN,
 				                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+					PLOG_DEBUG << "Using STUN server \"" << server.hostname << ":" << server.service
+					           << "\"";
 					g_object_set(G_OBJECT(mNiceAgent.get()), "stun-server", nodebuffer, nullptr);
 					g_object_set(G_OBJECT(mNiceAgent.get()), "stun-server-port",
 					             std::stoul(servbuffer), nullptr);
@@ -101,17 +440,66 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 			break;
 	}
 
+	// Add TURN servers
+	for (auto &server : servers) {
+		if (server.hostname.empty())
+			continue;
+		if (server.type != IceServer::Type::Turn)
+			continue;
+		if (server.service.empty())
+			server.service = server.relayType == IceServer::RelayType::TurnTls ? "5349" : "3478";
+
+		struct addrinfo hints = {};
+		hints.ai_family = AF_UNSPEC;
+		hints.ai_socktype =
+		    server.relayType == IceServer::RelayType::TurnUdp ? SOCK_DGRAM : SOCK_STREAM;
+		hints.ai_protocol =
+		    server.relayType == IceServer::RelayType::TurnUdp ? IPPROTO_UDP : IPPROTO_TCP;
+		hints.ai_flags = AI_ADDRCONFIG;
+		struct addrinfo *result = nullptr;
+		if (getaddrinfo(server.hostname.c_str(), server.service.c_str(), &hints, &result) != 0) {
+			PLOG_WARNING << "Unable to resolve TURN server address: " << server.hostname << ':'
+			             << server.service;
+			continue;
+		}
+
+		for (auto p = result; p; p = p->ai_next) {
+			if (p->ai_family == AF_INET || p->ai_family == AF_INET6) {
+				char nodebuffer[MAX_NUMERICNODE_LEN];
+				char servbuffer[MAX_NUMERICSERV_LEN];
+				if (getnameinfo(p->ai_addr, p->ai_addrlen, nodebuffer, MAX_NUMERICNODE_LEN,
+				                servbuffer, MAX_NUMERICNODE_LEN,
+				                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+
+					NiceRelayType niceRelayType;
+					switch (server.relayType) {
+					case IceServer::RelayType::TurnTcp:
+						niceRelayType = NICE_RELAY_TYPE_TURN_TCP;
+						break;
+					case IceServer::RelayType::TurnTls:
+						niceRelayType = NICE_RELAY_TYPE_TURN_TLS;
+						break;
+					default:
+						niceRelayType = NICE_RELAY_TYPE_TURN_UDP;
+						break;
+					}
+					nice_agent_set_relay_info(mNiceAgent.get(), mStreamId, 1, nodebuffer,
+					                          std::stoul(servbuffer), server.username.c_str(),
+					                          server.password.c_str(), niceRelayType);
+				}
+			}
+		}
+
+		freeaddrinfo(result);
+	}
+
 	g_signal_connect(G_OBJECT(mNiceAgent.get()), "component-state-changed",
-	                 G_CALLBACK(StateChangedCallback), this);
+	                 G_CALLBACK(StateChangeCallback), this);
 	g_signal_connect(G_OBJECT(mNiceAgent.get()), "new-candidate-full",
 	                 G_CALLBACK(CandidateCallback), this);
 	g_signal_connect(G_OBJECT(mNiceAgent.get()), "candidate-gathering-done",
 	                 G_CALLBACK(GatheringDoneCallback), this);
 
-	mStreamId = nice_agent_add_stream(mNiceAgent.get(), 1);
-	if (!mStreamId)
-		throw std::runtime_error("Failed to add a stream");
-
 	nice_agent_set_stream_name(mNiceAgent.get(), mStreamId, "application");
 	nice_agent_set_port_range(mNiceAgent.get(), mStreamId, 1, config.portRangeBegin,
 	                          config.portRangeEnd);
@@ -120,44 +508,74 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 	                       RecvCallback, this);
 }
 
-IceTransport::~IceTransport() {
+IceTransport::~IceTransport() { stop(); }
+
+bool IceTransport::stop() {
+	if (mTimeoutId) {
+		g_source_remove(mTimeoutId);
+		mTimeoutId = 0;
+	}
+
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Stopping ICE thread";
+	nice_agent_attach_recv(mNiceAgent.get(), mStreamId, 1, g_main_loop_get_context(mMainLoop.get()),
+	                       NULL, NULL);
+	nice_agent_remove_stream(mNiceAgent.get(), mStreamId);
 	g_main_loop_quit(mMainLoop.get());
-	if (mMainLoopThread.joinable())
+	mMainLoopThread.join();
-		mMainLoopThread.join();
+	return true;
 }
 
 Description::Role IceTransport::role() const { return mRole; }
 
-IceTransport::State IceTransport::state() const { return mState; }
-
 Description IceTransport::getLocalDescription(Description::Type type) const {
+	// RFC 8445: The initiating agent that started the ICE processing MUST take the controlling
+	// role, and the other MUST take the controlled role.
+	g_object_set(G_OBJECT(mNiceAgent.get()), "controlling-mode",
+	             type == Description::Type::Offer ? TRUE : FALSE, nullptr);
+
 	std::unique_ptr<gchar[], void (*)(void *)> sdp(nice_agent_generate_local_sdp(mNiceAgent.get()),
 	                                               g_free);
-	return Description(string(sdp.get()), type, mRole);
+
+	// RFC 5763: The endpoint that is the offerer MUST use the setup attribute value of
+	// setup:actpass.
+	// See https://tools.ietf.org/html/rfc5763#section-5
+	return Description(string(sdp.get()), type,
+	                   type == Description::Type::Offer ? Description::Role::ActPass : mRole);
 }
 
 void IceTransport::setRemoteDescription(const Description &description) {
-	mRole = description.role() == Description::Role::Active ? Description::Role::Passive
+	if (mRole == Description::Role::ActPass)
-	                                                        : Description::Role::Active;
+		mRole = description.role() == Description::Role::Active ? Description::Role::Passive
-	mMid = description.mid();
+		                                                        : Description::Role::Active;
+	if (mRole == description.role())
+		throw std::logic_error("Incompatible roles with remote description");
 
-	if (nice_agent_parse_remote_sdp(mNiceAgent.get(), string(description).c_str()))
+	mMid = description.bundleMid();
-		throw std::runtime_error("Failed to parse remote SDP");
+	mTrickleTimeout = !description.ended() ? 30s : 0s;
-}
 
-void IceTransport::gatherLocalCandidates() {
+	// Warning: libnice expects "\n" as end of line
-	if (!nice_agent_gather_candidates(mNiceAgent.get(), mStreamId))
+	if (nice_agent_parse_remote_sdp(mNiceAgent.get(),
-		throw std::runtime_error("Failed to gather local ICE candidates");
+	                                description.generateApplicationSdp("\n").c_str()) < 0)
+		throw std::runtime_error("Failed to parse ICE settings from remote SDP");
 }
 
 bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
+	// Don't try to pass unresolved candidates to libnice for more safety
+	if (!candidate.isResolved())
+		return false;
+
 	// Warning: the candidate string must start with "a=candidate:" and it must not end with a
-	// newline, else libnice will reject it.
+	// newline or whitespace, else libnice will reject it.
 	string sdp(candidate);
 	NiceCandidate *cand =
 	    nice_agent_parse_remote_candidate_sdp(mNiceAgent.get(), mStreamId, sdp.c_str());
-	if (!cand)
+	if (!cand) {
+		PLOG_WARNING << "Rejected ICE candidate: " << sdp;
 		return false;
+	}
 
 	GSList *list = g_slist_append(nullptr, cand);
 	int ret = nice_agent_set_remote_candidates(mNiceAgent.get(), mStreamId, 1, list);
@@ -166,66 +584,210 @@ bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
 	return ret > 0;
 }
 
+void IceTransport::gatherLocalCandidates(string mid) {
+	mMid = std::move(mid);
+
+	// Change state now as candidates calls can be synchronous
+	changeGatheringState(GatheringState::InProgress);
+
+	if (!nice_agent_gather_candidates(mNiceAgent.get(), mStreamId)) {
+		throw std::runtime_error("Failed to gather local ICE candidates");
+	}
+}
+
+std::optional<string> IceTransport::getLocalAddress() const {
+	NiceCandidate *local = nullptr;
+	NiceCandidate *remote = nullptr;
+	if (nice_agent_get_selected_pair(mNiceAgent.get(), mStreamId, 1, &local, &remote)) {
+		return std::make_optional(AddressToString(local->addr));
+	}
+	return nullopt;
+}
+
+std::optional<string> IceTransport::getRemoteAddress() const {
+	NiceCandidate *local = nullptr;
+	NiceCandidate *remote = nullptr;
+	if (nice_agent_get_selected_pair(mNiceAgent.get(), mStreamId, 1, &local, &remote)) {
+		return std::make_optional(AddressToString(remote->addr));
+	}
+	return nullopt;
+}
+
 bool IceTransport::send(message_ptr message) {
-	if (!mStreamId)
+	auto s = state();
+	if (!message || (s != State::Connected && s != State::Completed))
 		return false;
 
-	outgoing(message);
+	PLOG_VERBOSE << "Send size=" << message->size();
-	return true;
+	return outgoing(message);
 }
 
-void IceTransport::incoming(message_ptr message) { recv(message); }
+bool IceTransport::outgoing(message_ptr message) {
-
+	std::lock_guard lock(mOutgoingMutex);
-void IceTransport::incoming(const byte *data, int size) {
+	if (mOutgoingDscp != message->dscp) {
-	incoming(make_message(data, data + size));
+		mOutgoingDscp = message->dscp;
+		// Explicit Congestion Notification takes the least-significant 2 bits of the DS field
+		int ds = int(message->dscp << 2);
+		nice_agent_set_stream_tos(mNiceAgent.get(), mStreamId, ds); // ToS is the legacy name for DS
+	}
+	return nice_agent_send(mNiceAgent.get(), mStreamId, 1, message->size(),
+	                       reinterpret_cast<const char *>(message->data())) >= 0;
 }
 
-void IceTransport::outgoing(message_ptr message) {
+void IceTransport::changeGatheringState(GatheringState state) {
-	nice_agent_send(mNiceAgent.get(), mStreamId, 1, message->size(),
+	if (mGatheringState.exchange(state) != state)
-	                reinterpret_cast<const char *>(message->data()));
+		mGatheringStateChangeCallback(mGatheringState);
+}
+
+void IceTransport::processTimeout() {
+	PLOG_WARNING << "ICE timeout";
+	mTimeoutId = 0;
+	changeState(State::Failed);
 }
 
 void IceTransport::processCandidate(const string &candidate) {
 	mCandidateCallback(Candidate(candidate, mMid));
 }
 
-void IceTransport::processGatheringDone() { mCandidateCallback(nullopt); }
+void IceTransport::processGatheringDone() { changeGatheringState(GatheringState::Complete); }
 
-void IceTransport::changeState(uint32_t state) {
+void IceTransport::processStateChange(unsigned int state) {
-	mState = static_cast<State>(state);
+	if (state == NICE_COMPONENT_STATE_FAILED && mTrickleTimeout.count() > 0) {
-	if (mState == State::Ready) {
+		if (mTimeoutId)
-		mReadyCallback();
+			g_source_remove(mTimeoutId);
+		mTimeoutId = g_timeout_add(mTrickleTimeout.count() /* ms */, TimeoutCallback, this);
+		return;
 	}
+
+	if (state == NICE_COMPONENT_STATE_CONNECTED && mTimeoutId) {
+		g_source_remove(mTimeoutId);
+		mTimeoutId = 0;
+	}
+
+	switch (state) {
+	case NICE_COMPONENT_STATE_DISCONNECTED:
+		changeState(State::Disconnected);
+		break;
+	case NICE_COMPONENT_STATE_CONNECTING:
+		changeState(State::Connecting);
+		break;
+	case NICE_COMPONENT_STATE_CONNECTED:
+		changeState(State::Connected);
+		break;
+	case NICE_COMPONENT_STATE_READY:
+		changeState(State::Completed);
+		break;
+	case NICE_COMPONENT_STATE_FAILED:
+		changeState(State::Failed);
+		break;
+	};
+}
+
+string IceTransport::AddressToString(const NiceAddress &addr) {
+	char buffer[NICE_ADDRESS_STRING_LEN];
+	nice_address_to_string(&addr, buffer);
+	unsigned int port = nice_address_get_port(&addr);
+	std::ostringstream ss;
+	ss << buffer << ":" << port;
+	return ss.str();
 }
 
 void IceTransport::CandidateCallback(NiceAgent *agent, NiceCandidate *candidate,
                                      gpointer userData) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(userData);
 	gchar *cand = nice_agent_generate_local_candidate_sdp(agent, candidate);
-	iceTransport->processCandidate(cand);
+	try {
+		iceTransport->processCandidate(cand);
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
 	g_free(cand);
 }
 
-void IceTransport::GatheringDoneCallback(NiceAgent *agent, guint streamId, gpointer userData) {
+void IceTransport::GatheringDoneCallback(NiceAgent * /*agent*/, guint /*streamId*/,
+                                         gpointer userData) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(userData);
-	iceTransport->processGatheringDone();
+	try {
+		iceTransport->processGatheringDone();
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
 }
 
-void IceTransport::StateChangedCallback(NiceAgent *agent, guint streamId, guint componentId,
+void IceTransport::StateChangeCallback(NiceAgent * /*agent*/, guint /*streamId*/,
-                                        guint state, gpointer userData) {
+                                       guint /*componentId*/, guint state, gpointer userData) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(userData);
-	iceTransport->changeState(state);
+	try {
+		iceTransport->processStateChange(state);
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
 }
 
-void IceTransport::RecvCallback(NiceAgent *agent, guint streamId, guint componentId, guint len,
+void IceTransport::RecvCallback(NiceAgent * /*agent*/, guint /*streamId*/, guint /*componentId*/,
-                                gchar *buf, gpointer userData) {
+                                guint len, gchar *buf, gpointer userData) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(userData);
-	iceTransport->incoming(reinterpret_cast<byte *>(buf), len);
+	try {
+		PLOG_VERBOSE << "Incoming size=" << len;
+		auto b = reinterpret_cast<byte *>(buf);
+		iceTransport->incoming(make_message(b, b + len));
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
 }
 
-void IceTransport::LogCallback(const gchar *logDomain, GLogLevelFlags logLevel,
+gboolean IceTransport::TimeoutCallback(gpointer userData) {
-                               const gchar *message, gpointer userData) {
+	auto iceTransport = static_cast<rtc::IceTransport *>(userData);
-	std::cout << message << std::endl;
+	try {
+		iceTransport->processTimeout();
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
+	return FALSE;
+}
+
+void IceTransport::LogCallback(const gchar * /*logDomain*/, GLogLevelFlags logLevel,
+                               const gchar *message, gpointer /*userData*/) {
+	plog::Severity severity;
+	unsigned int flags = logLevel & G_LOG_LEVEL_MASK;
+	if (flags & G_LOG_LEVEL_ERROR)
+		severity = plog::fatal;
+	else if (flags & G_LOG_LEVEL_CRITICAL)
+		severity = plog::error;
+	else if (flags & G_LOG_LEVEL_WARNING)
+		severity = plog::warning;
+	else if (flags & G_LOG_LEVEL_MESSAGE)
+		severity = plog::info;
+	else if (flags & G_LOG_LEVEL_INFO)
+		severity = plog::info;
+	else
+		severity = plog::verbose; // libnice debug as verbose
+
+	PLOG(severity) << "nice: " << message;
+}
+
+bool IceTransport::getSelectedCandidatePair(Candidate *local, Candidate *remote) {
+	NiceCandidate *niceLocal, *niceRemote;
+	if (!nice_agent_get_selected_pair(mNiceAgent.get(), mStreamId, 1, &niceLocal, &niceRemote))
+		return false;
+
+	gchar *sdpLocal = nice_agent_generate_local_candidate_sdp(mNiceAgent.get(), niceLocal);
+	if (local)
+		*local = Candidate(sdpLocal, mMid);
+	g_free(sdpLocal);
+
+	gchar *sdpRemote = nice_agent_generate_local_candidate_sdp(mNiceAgent.get(), niceRemote);
+	if (remote)
+		*remote = Candidate(sdpRemote, mMid);
+	g_free(sdpRemote);
+
+	if (local)
+		local->resolve(Candidate::ResolveMode::Simple);
+	if (remote)
+		remote->resolve(Candidate::ResolveMode::Simple);
+	return true;
 }
 
 } // namespace rtc
+
+#endif

src/icetransport.hpp

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2019 Paul-Louis Ageneau
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -20,78 +20,101 @@
 #define RTC_ICE_TRANSPORT_H
 
 #include "candidate.hpp"
-#include "description.hpp"
 #include "configuration.hpp"
+#include "description.hpp"
 #include "include.hpp"
 #include "peerconnection.hpp"
 #include "transport.hpp"
 
-extern "C" {
+#if !USE_NICE
+#include <juice/juice.h>
+#else
 #include <nice/agent.h>
-}
+#endif
 
 #include <atomic>
-#include <optional>
+#include <chrono>
 #include <thread>
+#include <mutex>
 
 namespace rtc {
 
 class IceTransport : public Transport {
 public:
-	enum class State : uint32_t {
+	enum class GatheringState { New = 0, InProgress = 1, Complete = 2 };
-		Disconnected = NICE_COMPONENT_STATE_DISCONNECTED,
-		Gathering = NICE_COMPONENT_STATE_GATHERING,
-		Connecting = NICE_COMPONENT_STATE_CONNECTING,
-		Connected = NICE_COMPONENT_STATE_CONNECTED,
-		Ready = NICE_COMPONENT_STATE_READY,
-		Failed = NICE_COMPONENT_STATE_FAILED
-	};
 
-	using candidate_callback = std::function<void(const std::optional<Candidate> &candidate)>;
+	using candidate_callback = std::function<void(const Candidate &candidate)>;
-	using ready_callback = std::function<void(void)>;
+	using gathering_state_callback = std::function<void(GatheringState state)>;
 
-	IceTransport(const Configuration &config, Description::Role role,
+	IceTransport(const Configuration &config, candidate_callback candidateCallback,
-	             candidate_callback candidateCallback, ready_callback ready);
+	             state_callback stateChangeCallback,
+	             gathering_state_callback gatheringStateChangeCallback);
 	~IceTransport();
 
 	Description::Role role() const;
-	State state() const;
+	GatheringState gatheringState() const;
 	Description getLocalDescription(Description::Type type) const;
 	void setRemoteDescription(const Description &description);
-	void gatherLocalCandidates();
 	bool addRemoteCandidate(const Candidate &candidate);
+	void gatherLocalCandidates(string mid);
 
-	bool send(message_ptr message);
+	std::optional<string> getLocalAddress() const;
+	std::optional<string> getRemoteAddress() const;
+
+	bool stop() override;
+	bool send(message_ptr message) override; // false if dropped
+
+	bool getSelectedCandidatePair(Candidate *local, Candidate *remote);
 
 private:
-	void incoming(message_ptr message);
+	bool outgoing(message_ptr message) override;
-	void incoming(const byte *data, int size);
-	void outgoing(message_ptr message);
 
-	void changeState(uint32_t state);
+	void changeGatheringState(GatheringState state);
+
+	void processStateChange(unsigned int state);
 	void processCandidate(const string &candidate);
 	void processGatheringDone();
+	void processTimeout();
 
 	Description::Role mRole;
 	string mMid;
-	State mState;
+	std::chrono::milliseconds mTrickleTimeout;
+	std::atomic<GatheringState> mGatheringState;
 
+	candidate_callback mCandidateCallback;
+	gathering_state_callback mGatheringStateChangeCallback;
+
+#if !USE_NICE
+	std::unique_ptr<juice_agent_t, void (*)(juice_agent_t *)> mAgent;
+	string mStunHostname;
+	string mStunService;
+
+	static void StateChangeCallback(juice_agent_t *agent, juice_state_t state, void *user_ptr);
+	static void CandidateCallback(juice_agent_t *agent, const char *sdp, void *user_ptr);
+	static void GatheringDoneCallback(juice_agent_t *agent, void *user_ptr);
+	static void RecvCallback(juice_agent_t *agent, const char *data, size_t size, void *user_ptr);
+	static void LogCallback(juice_log_level_t level, const char *message);
+#else
 	uint32_t mStreamId = 0;
 	std::unique_ptr<NiceAgent, void (*)(gpointer)> mNiceAgent;
 	std::unique_ptr<GMainLoop, void (*)(GMainLoop *)> mMainLoop;
 	std::thread mMainLoopThread;
+	guint mTimeoutId = 0;
+	std::mutex mOutgoingMutex;
+	unsigned int mOutgoingDscp;
 
-	candidate_callback mCandidateCallback;
+	static string AddressToString(const NiceAddress &addr);
-	ready_callback mReadyCallback;
 
 	static void CandidateCallback(NiceAgent *agent, NiceCandidate *candidate, gpointer userData);
 	static void GatheringDoneCallback(NiceAgent *agent, guint streamId, gpointer userData);
-	static void StateChangedCallback(NiceAgent *agent, guint streamId, guint componentId,
+	static void StateChangeCallback(NiceAgent *agent, guint streamId, guint componentId,
-	                                 guint state, gpointer userData);
+	                                guint state, gpointer userData);
 	static void RecvCallback(NiceAgent *agent, guint stream_id, guint component_id, guint len,
 	                         gchar *buf, gpointer userData);
+	static gboolean TimeoutCallback(gpointer userData);
 	static void LogCallback(const gchar *log_domain, GLogLevelFlags log_level, const gchar *message,
 	                        gpointer user_data);
+#endif
 };
 
 } // namespace rtc

src/init.cpp

@@ -0,0 +1,144 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "init.hpp"
+
+#include "certificate.hpp"
+#include "dtlstransport.hpp"
+#include "sctptransport.hpp"
+#include "threadpool.hpp"
+#include "tls.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+#include "tlstransport.hpp"
+#endif
+
+#if RTC_ENABLE_MEDIA
+#include "dtlssrtptransport.hpp"
+#endif
+
+#ifdef _WIN32
+#include <winsock2.h>
+#endif
+
+using std::shared_ptr;
+
+namespace rtc {
+
+namespace {
+
+void doInit() {
+	PLOG_DEBUG << "Global initialization";
+
+#ifdef _WIN32
+	WSADATA wsaData;
+	if (WSAStartup(MAKEWORD(2, 2), &wsaData))
+		throw std::runtime_error("WSAStartup failed, error=" + std::to_string(WSAGetLastError()));
+#endif
+
+	ThreadPool::Instance().spawn(THREADPOOL_SIZE);
+
+#if USE_GNUTLS
+	// Nothing to do
+#else
+	openssl::init();
+#endif
+
+	SctpTransport::Init();
+	DtlsTransport::Init();
+#if RTC_ENABLE_WEBSOCKET
+	TlsTransport::Init();
+#endif
+#if RTC_ENABLE_MEDIA
+	DtlsSrtpTransport::Init();
+#endif
+}
+
+void doCleanup() {
+	PLOG_DEBUG << "Global cleanup";
+
+	ThreadPool::Instance().join();
+	CleanupCertificateCache();
+
+	SctpTransport::Cleanup();
+	DtlsTransport::Cleanup();
+#if RTC_ENABLE_WEBSOCKET
+	TlsTransport::Cleanup();
+#endif
+#if RTC_ENABLE_MEDIA
+	DtlsSrtpTransport::Cleanup();
+#endif
+
+#ifdef _WIN32
+	WSACleanup();
+#endif
+}
+
+} // namespace
+
+std::weak_ptr<void> Init::Weak;
+std::shared_ptr<void> *Init::Global = nullptr;
+bool Init::Initialized = false;
+std::recursive_mutex Init::Mutex;
+
+init_token Init::Token() {
+	std::unique_lock lock(Mutex);
+	if (auto token = Weak.lock())
+		return token;
+
+	delete Global;
+	Global = new shared_ptr<void>(new Init());
+	Weak = *Global;
+	return *Global;
+}
+
+void Init::Preload() {
+	std::unique_lock lock(Mutex);
+	auto token = Token();
+	if (!Global)
+		Global = new shared_ptr<void>(token);
+
+	PLOG_DEBUG << "Preloading certificate";
+	make_certificate().wait();
+}
+
+void Init::Cleanup() {
+	std::unique_lock lock(Mutex);
+	delete Global;
+	Global = nullptr;
+}
+
+Init::Init() {
+	// Mutex is locked by Token() here
+	if (!std::exchange(Initialized, true))
+		doInit();
+}
+
+Init::~Init() {
+	std::thread t([]() {
+		// We need to lock Mutex ourselves
+		std::unique_lock lock(Mutex);
+		if (Global)
+			return;
+		if (std::exchange(Initialized, false))
+			doCleanup();
+	});
+	t.detach();
+}
+
+} // namespace rtc

src/log.cpp

@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "log.hpp"
+
+#include "plog/Appenders/ColorConsoleAppender.h"
+#include "plog/Formatters/TxtFormatter.h"
+#include "plog/Init.h"
+#include "plog/Log.h"
+#include "plog/Logger.h"
+
+#include <mutex>
+
+namespace rtc {
+
+void InitLogger(LogLevel level) { InitLogger(static_cast<plog::Severity>(level)); }
+
+void InitLogger(plog::Severity severity, plog::IAppender *appender) {
+	static plog::ColorConsoleAppender<plog::TxtFormatter> consoleAppender;
+	static plog::Logger<0> *logger = nullptr;
+	static std::mutex mutex;
+	std::lock_guard lock(mutex);
+	if (!logger) {
+		logger = &plog::init(severity, appender ? appender : &consoleAppender);
+		PLOG_DEBUG << "Logger initialized";
+	} else {
+		logger->setMaxSeverity(severity);
+		if (appender)
+			logger->addAppender(appender);
+	}
+}
+} // namespace rtc

src/message.cpp

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "message.hpp"
+
+namespace rtc {
+
+message_ptr make_message(size_t size, Message::Type type, unsigned int stream,
+                         std::shared_ptr<Reliability> reliability) {
+	auto message = std::make_shared<Message>(size, type);
+	message->stream = stream;
+	message->reliability = reliability;
+	return message;
+}
+
+message_ptr make_message(binary &&data, Message::Type type, unsigned int stream,
+                         std::shared_ptr<Reliability> reliability) {
+	auto message = std::make_shared<Message>(std::move(data), type);
+	message->stream = stream;
+	message->reliability = reliability;
+	return message;
+}
+
+message_ptr make_message(message_variant data) {
+	return std::visit( //
+	    overloaded{
+	        [&](binary data) { return make_message(std::move(data), Message::Binary); },
+	        [&](string data) {
+		        auto b = reinterpret_cast<const byte *>(data.data());
+		        return make_message(b, b + data.size(), Message::String);
+	        },
+	    },
+	    std::move(data));
+}
+
+message_variant to_variant(Message &&message) {
+	switch (message.type) {
+	case Message::String:
+		return string(reinterpret_cast<const char *>(message.data()), message.size());
+	default:
+		return std::move(message);
+	}
+}
+
+} // namespace rtc

src/processor.cpp

@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "processor.hpp"
+
+namespace rtc {
+
+Processor::Processor(size_t limit) : mTasks(limit) {}
+
+Processor::~Processor() { join(); }
+
+void Processor::join() {
+	std::unique_lock lock(mMutex);
+	mCondition.wait(lock, [this]() { return !mPending && mTasks.empty(); });
+}
+
+void Processor::schedule() {
+	std::unique_lock lock(mMutex);
+	if (auto next = mTasks.tryPop()) {
+		ThreadPool::Instance().enqueue(std::move(*next));
+	} else {
+		// No more tasks
+		mPending = false;
+		mCondition.notify_all();
+	}
+}
+
+} // namespace rtc

src/processor.hpp

@@ -0,0 +1,81 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_PROCESSOR_H
+#define RTC_PROCESSOR_H
+
+#include "include.hpp"
+#include "init.hpp"
+#include "threadpool.hpp"
+#include "queue.hpp"
+
+#include <condition_variable>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <queue>
+
+namespace rtc {
+
+// Processed tasks in order by delegating them to the thread pool
+class Processor final {
+public:
+	Processor(size_t limit = 0);
+	~Processor();
+
+	Processor(const Processor &) = delete;
+	Processor &operator=(const Processor &) = delete;
+	Processor(Processor &&) = delete;
+	Processor &operator=(Processor &&) = delete;
+
+	void join();
+
+	template <class F, class... Args> void enqueue(F &&f, Args &&... args);
+
+protected:
+	void schedule();
+
+	// Keep an init token
+	const init_token mInitToken = Init::Token();
+
+	Queue<std::function<void()>> mTasks;
+	bool mPending = false; // true iff a task is pending in the thread pool
+
+	mutable std::mutex mMutex;
+	std::condition_variable mCondition;
+};
+
+template <class F, class... Args> void Processor::enqueue(F &&f, Args &&... args) {
+	std::unique_lock lock(mMutex);
+	auto bound = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
+	auto task = [this, bound = std::move(bound)]() mutable {
+		scope_guard guard(std::bind(&Processor::schedule, this)); // chain the next task
+		return bound();
+	};
+
+	if (!mPending) {
+		ThreadPool::Instance().enqueue(std::move(task));
+		mPending = true;
+	} else {
+		mTasks.push(std::move(task));
+	}
+}
+
+} // namespace rtc
+
+#endif

src/queue.hpp

@@ -1,90 +0,0 @@
-/**
- * Copyright (c) 2019 Paul-Louis Ageneau
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef RTC_QUEUE_H
-#define RTC_QUEUE_H
-
-#include "include.hpp"
-
-#include <atomic>
-#include <condition_variable>
-#include <mutex>
-#include <optional>
-#include <queue>
-
-namespace rtc {
-
-template <typename T> class Queue {
-public:
-	Queue();
-	~Queue();
-
-	void stop();
-	void push(const T &element);
-	std::optional<T> pop();
-
-	bool empty() const;
-
-private:
-	std::queue<T> mQueue;
-	std::condition_variable mCondition;
-	std::atomic<bool> mStopping;
-
-	mutable std::mutex mMutex;
-};
-
-template <typename T> Queue<T>::Queue() : mStopping(false) {}
-
-template <typename T> Queue<T>::~Queue() { stop(); }
-
-template <typename T> void Queue<T>::stop() {
-	std::lock_guard<std::mutex> lock(mMutex);
-	mStopping = true;
-	mCondition.notify_all();
-}
-
-template <typename T> void Queue<T>::push(const T &element) {
-	std::lock_guard<std::mutex> lock(mMutex);
-	if (mStopping)
-		return;
-	mQueue.push(element);
-	mCondition.notify_one();
-}
-
-template <typename T> std::optional<T> Queue<T>::pop() {
-	std::unique_lock<std::mutex> lock(mMutex);
-	while (mQueue.empty()) {
-		if (mStopping)
-			return nullopt;
-		mCondition.wait(lock);
-	}
-
-	std::optional<T> element = mQueue.front();
-	mQueue.pop();
-	return element;
-}
-
-template <typename T> bool Queue<T>::empty() const {
-	std::lock_guard<std::mutex> lock(mMutex);
-	return mQueue.empty();
-}
-
-} // namespace rtc
-
-#endif
-

src/rtc.cpp

@@ -1,194 +0,0 @@
-/**
- * Copyright (c) 2019 Paul-Louis Ageneau
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "datachannel.hpp"
-#include "peerconnection.hpp"
-
-#include <rtc.h>
-
-#include <unordered_map>
-
-using namespace rtc;
-using std::shared_ptr;
-using std::string;
-
-namespace {
-
-std::unordered_map<int, shared_ptr<PeerConnection>> peerConnectionMap;
-std::unordered_map<int, shared_ptr<DataChannel>> dataChannelMap;
-std::unordered_map<int, void *> userPointerMap;
-int lastId = 0;
-
-void *getUserPointer(int id) {
-	auto it = userPointerMap.find(id);
-	return it != userPointerMap.end() ? it->second : nullptr;
-}
-
-} // namespace
-
-int rtcCreatePeerConnection(const char **iceServers, int iceServersCount) {
-	Configuration config;
-	for (int i = 0; i < iceServersCount; ++i) {
-		config.iceServers.emplace_back(IceServer(string(iceServers[i])));
-	}
-	int pc = ++lastId;
-	peerConnectionMap.emplace(std::make_pair(pc, std::make_shared<PeerConnection>(config)));
-	return pc;
-}
-
-void rtcDeletePeerConnection(int pc) { peerConnectionMap.erase(pc); }
-
-int rtcCreateDataChannel(int pc, const char *label) {
-	auto it = peerConnectionMap.find(pc);
-	if (it == peerConnectionMap.end())
-		return 0;
-	auto dataChannel = it->second->createDataChannel(string(label));
-	int dc = ++lastId;
-	dataChannelMap.emplace(std::make_pair(dc, dataChannel));
-	return dc;
-}
-
-void rtcDeleteDataChannel(int dc) { dataChannelMap.erase(dc); }
-
-void rtcSetDataChannelCallback(int pc, void (*dataChannelCallback)(int, void *)) {
-	auto it = peerConnectionMap.find(pc);
-	if (it == peerConnectionMap.end())
-		return;
-
-	it->second->onDataChannel([pc, dataChannelCallback](std::shared_ptr<DataChannel> dataChannel) {
-		int dc = ++lastId;
-		dataChannelMap.emplace(std::make_pair(dc, dataChannel));
-		dataChannelCallback(dc, getUserPointer(pc));
-	});
-}
-
-void rtcSetLocalDescriptionCallback(int pc, void (*descriptionCallback)(const char *, const char *,
-                                                                        void *)) {
-	auto it = peerConnectionMap.find(pc);
-	if (it == peerConnectionMap.end())
-		return;
-
-	it->second->onLocalDescription([pc, descriptionCallback](const Description &description) {
-		descriptionCallback(string(description).c_str(), description.typeString().c_str(),
-		                    getUserPointer(pc));
-	});
-}
-
-void rtcSetLocalCandidateCallback(int pc,
-                                  void (*candidateCallback)(const char *, const char *, void *)) {
-	auto it = peerConnectionMap.find(pc);
-	if (it == peerConnectionMap.end())
-		return;
-
-	it->second->onLocalCandidate(
-	    [pc, candidateCallback](const std::optional<Candidate> &candidate) {
-		    if (candidate) {
-			    candidateCallback(string(*candidate).c_str(), candidate->mid().c_str(),
-			                      getUserPointer(pc));
-		    } else {
-			    candidateCallback(nullptr, nullptr, getUserPointer(pc));
-		    }
-	    });
-}
-
-void rtcSetRemoteDescription(int pc, const char *sdp, const char *type) {
-	auto it = peerConnectionMap.find(pc);
-	if (it == peerConnectionMap.end())
-		return;
-
-	it->second->setRemoteDescription(Description(string(sdp), type ? string(type) : ""));
-}
-
-void rtcAddRemoteCandidate(int pc, const char *candidate, const char *mid) {
-	auto it = peerConnectionMap.find(pc);
-	if (it == peerConnectionMap.end())
-		return;
-
-	it->second->addRemoteCandidate(Candidate(string(candidate), mid ? string(mid) : ""));
-}
-
-int rtcGetDataChannelLabel(int dc, char *buffer, int size) {
-	auto it = dataChannelMap.find(dc);
-	if (it == dataChannelMap.end())
-		return 0;
-
-	if (!size)
-		return 0;
-
-	string label = it->second->label();
-	size = std::min(size_t(size - 1), label.size());
-	std::copy(label.data(), label.data() + size, buffer);
-	buffer[size] = '\0';
-	return size + 1;
-}
-
-void rtcSetOpenCallback(int dc, void (*openCallback)(void *)) {
-	auto it = dataChannelMap.find(dc);
-	if (it == dataChannelMap.end())
-		return;
-
-	it->second->onOpen([dc, openCallback]() { openCallback(getUserPointer(dc)); });
-}
-
-void rtcSetErrorCallback(int dc, void (*errorCallback)(const char *, void *)) {
-	auto it = dataChannelMap.find(dc);
-	if (it == dataChannelMap.end())
-		return;
-
-	it->second->onError([dc, errorCallback](const string &error) {
-		errorCallback(error.c_str(), getUserPointer(dc));
-	});
-}
-
-void rtcSetMessageCallback(int dc, void (*messageCallback)(const char *, int, void *)) {
-	auto it = dataChannelMap.find(dc);
-	if (it == dataChannelMap.end())
-		return;
-
-	it->second->onMessage(
-	    [dc, messageCallback](const binary &b) {
-		    messageCallback(reinterpret_cast<const char *>(b.data()), b.size(), getUserPointer(dc));
-	    },
-	    [dc, messageCallback](const string &s) {
-		    messageCallback(s.c_str(), -1, getUserPointer(dc));
-	    });
-}
-
-int rtcSendMessage(int dc, const char *data, int size) {
-	auto it = dataChannelMap.find(dc);
-	if (it == dataChannelMap.end())
-		return 0;
-
-	if (size >= 0) {
-		auto b = reinterpret_cast<const byte *>(data);
-		it->second->send(b, size);
-		return size;
-	} else {
-		string s(data);
-		it->second->send(s);
-		return s.size();
-	}
-}
-
-void rtcSetUserPointer(int i, void *ptr) {
-	if (ptr)
-		userPointerMap.insert(std::make_pair(i, ptr));
-	else
-		userPointerMap.erase(i);
-}
-