Bumped version to 0.10.2

Schedule SCTP recv task only if necessary

.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

@@ -1,4 +1,4 @@
-name: Build and test with GnuTLS
+name: Build with GnuTLS
 on:
   push:
     branches:
@@ -7,16 +7,16 @@ on:
     branches:
     - master
 jobs:
-  build-ubuntu:
+  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
+      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_JUICE=1 -DUSE_GNUTLS=1
+      run: cmake -B build -DUSE_GNUTLS=1 -DUSE_SYSTEM_SRTP=1 -DWARNINGS_AS_ERRORS=1
     - name: make
       run: (cd build; make -j2)
     - name: test
@@ -30,10 +30,7 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=1
-      env:
-# hack to bypass EPERM issue on sendto()
-        CFLAGS: -DJUICE_ENABLE_ADDRS_LOCALHOST
+      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

.github/workflows/build-nice.yml

@@ -1,4 +1,4 @@
-name: Build and test with libnice
+name: Build with libnice
 on:
   push:
     branches:
@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build-ubuntu:
+  build-media:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -16,7 +16,21 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_JUICE=0 -DUSE_GNUTLS=1
+      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

.github/workflows/build-openssl.yml

@@ -1,4 +1,4 @@
-name: Build and test with OpenSSL
+name: Build with OpenSSL
 on:
   push:
     branches:
@@ -7,16 +7,16 @@ on:
     branches:
     - master
 jobs:
-  build-ubuntu:
+  build-linux:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - name: install packages
-      run: sudo apt update && sudo apt install libssl-dev
+      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_JUICE=1 -DUSE_GNUTLS=0
+      run: cmake -B build -DUSE_GNUTLS=0 -DUSE_SYSTEM_SRTP=1 -DWARNINGS_AS_ERRORS=1
     - name: make
       run: (cd build; make -j2)
     - name: test
@@ -26,17 +26,34 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: install packages
-      run: brew reinstall openssl@1.1
+      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_JUICE=1 -DUSE_GNUTLS=0
+      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
-# hack to bypass EPERM issue on sendto()
-        CFLAGS: -DJUICE_ENABLE_ADDRS_LOCALHOST
     - 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
+

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "deps/plog"]
 	path = deps/plog
-	url = https://github.com/SergiusTheBest/plog
+	url = https://github.com/paullouisageneau/plog
 [submodule "usrsctp"]
 	path = deps/usrsctp
 	url = https://github.com/sctplab/usrsctp.git
@@ -10,3 +10,6 @@
 [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

@@ -1,17 +1,34 @@
 cmake_minimum_required(VERSION 3.7)
 project(libdatachannel
-	DESCRIPTION "WebRTC DataChannels Library"
-	VERSION 0.6.0
+	VERSION 0.10.2
 	LANGUAGES CXX)
+set(PROJECT_DESCRIPTION "WebRTC Data Channels Library")
 
+# Options
 option(USE_GNUTLS "Use GnuTLS instead of OpenSSL" OFF)
-option(USE_JUICE "Use libjuice instead of libnice" OFF)
-option(RTC_ENABLE_WEBSOCKET "Build WebSocket support" ON)
+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 instead of OpenSSL in libjuice" ON)
+	option(USE_NETTLE "Use Nettle in libjuice" ON)
 else()
-	option(USE_NETTLE "Use Nettle instead of OpenSSL in libjuice" OFF)
+	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)
@@ -21,6 +38,8 @@ 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()
 
@@ -36,16 +55,22 @@ set(LIBDATACHANNEL_SOURCES
 	${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/rtc.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
 )
@@ -57,6 +82,7 @@ set(LIBDATACHANNEL_HEADERS
 	${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
@@ -66,37 +92,47 @@ set(LIBDATACHANNEL_HEADERS
 	${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/capi.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)
-find_package(SRTP)
 
 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>)
-	target_compile_definitions(usrsctp-static PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
 endif()
 if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
     target_compile_options(usrsctp PRIVATE -Wno-error=format-truncation)
-	target_compile_options(usrsctp-static PRIVATE -Wno-error=format-truncation)
 endif()
 add_library(Usrsctp::Usrsctp ALIAS usrsctp)
-add_library(Usrsctp::UsrsctpStatic ALIAS usrsctp-static)
 
-if (RTC_ENABLE_WEBSOCKET)
+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})
@@ -105,13 +141,6 @@ if (RTC_ENABLE_WEBSOCKET)
 		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
 	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=1)
 	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=1)
-else()
-	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)
 endif()
 
 set_target_properties(datachannel PROPERTIES
@@ -125,20 +154,27 @@ target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/includ
 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::UsrsctpStatic)
+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::UsrsctpStatic)
+target_link_libraries(datachannel-static PRIVATE Usrsctp::Usrsctp)
 
 if(WIN32)
-	target_link_libraries(datachannel PRIVATE wsock32 ws2_32) # winsock2
-	target_link_libraries(datachannel-static PRIVATE wsock32 ws2_32) # winsock2
+	target_link_libraries(datachannel PRIVATE ws2_32) # winsock2
+	target_link_libraries(datachannel-static PRIVATE ws2_32) # winsock2
 endif()
 
-if(SRTP_FOUND)
+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
@@ -146,13 +182,17 @@ if(SRTP_FOUND)
 				IMPORTED_LINK_INTERFACE_LANGUAGES C
 				IMPORTED_LOCATION ${SRTP_LIBRARIES})
 		endif()
-	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=1)
-	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=1)
+		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()
-	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=0)
-	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=0)
+	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)
@@ -160,10 +200,10 @@ if (USE_GNUTLS)
 	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 ${GNUTLS_DEFINITIONS}
+			INTERFACE_INCLUDE_DIRECTORIES "${GNUTLS_INCLUDE_DIRS}"
+			INTERFACE_COMPILE_DEFINITIONS "${GNUTLS_DEFINITIONS}"
 			IMPORTED_LINK_INTERFACE_LANGUAGES C
-			IMPORTED_LOCATION ${GNUTLS_LIBRARIES})
+			IMPORTED_LOCATION "${GNUTLS_LIBRARIES}")
 	endif()
 	target_compile_definitions(datachannel PRIVATE USE_GNUTLS=1)
 	target_compile_definitions(datachannel-static PRIVATE USE_GNUTLS=1)
@@ -177,18 +217,28 @@ else()
 	target_link_libraries(datachannel-static PRIVATE OpenSSL::SSL)
 endif()
 
-if (USE_JUICE)
-	add_subdirectory(deps/libjuice EXCLUDE_FROM_ALL)
-	target_compile_definitions(datachannel PRIVATE USE_JUICE=1)
-	target_compile_definitions(datachannel-static PRIVATE USE_JUICE=1)
-	target_link_libraries(datachannel PRIVATE LibJuice::LibJuiceStatic)
-	target_link_libraries(datachannel-static PRIVATE LibJuice::LibJuiceStatic)
-else()
+if (USE_NICE OR NOT USE_JUICE)
 	find_package(LibNice REQUIRED)
-	target_compile_definitions(datachannel PRIVATE USE_JUICE=0)
-	target_compile_definitions(datachannel-static PRIVATE USE_JUICE=0)
+	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)
@@ -197,19 +247,62 @@ 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
-add_executable(datachannel-tests ${TESTS_SOURCES})
-set_target_properties(datachannel-tests PROPERTIES
+if(NOT NO_TESTS)
+	add_executable(datachannel-tests ${TESTS_SOURCES})
+	set_target_properties(datachannel-tests PROPERTIES
 		VERSION ${PROJECT_VERSION}
 		CXX_STANDARD 17)
-set_target_properties(datachannel-tests PROPERTIES OUTPUT_NAME tests)
-target_include_directories(datachannel-tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-target_link_libraries(datachannel-tests datachannel nlohmann_json::nlohmann_json)
+	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)
+	if(WIN32)
+		target_link_libraries(datachannel-tests datachannel-static) # DLL exports only the C API
+	else()
+		target_link_libraries(datachannel-tests datachannel)
+	endif()
+
+	# 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)
+	if(WIN32)
+		target_link_libraries(datachannel-benchmark datachannel-static) # DLL exports only the C API
+	else()
+		target_link_libraries(datachannel-benchmark datachannel)
+	endif()
+endif()
 
 # Examples
-set(JSON_BuildTests OFF CACHE INTERNAL "")
-add_subdirectory(deps/json)
-add_subdirectory(examples/client)
-add_subdirectory(examples/copy-paste)
-add_subdirectory(examples/copy-paste-capi)
+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

@@ -3,34 +3,40 @@ 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>USE_JUICE=1
+	<define>USE_NICE=0
 	<define>RTC_ENABLE_MEDIA=0
 	<define>RTC_ENABLE_WEBSOCKET=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
 	<library>/libdatachannel//plog
-	<cxxflags>-pthread
-	<toolset>gcc:<cxxflags>"-Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
-	<toolset>clang:<cxxflags>"-Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
+	<toolset>gcc:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
+	<toolset>clang:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
 	;
 
-feature gnutls : off on : composite propagated ;
-feature.compose <gnutls>off
-    : <define>USE_GNUTLS=0 ;
-feature.compose <gnutls>on
-    : <define>USE_GNUTLS=1 ;
-
 alias plog
     : # no sources
     : # no build requirements
@@ -48,41 +54,205 @@ alias usrsctp
     <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
-	<library>libjuice.a
+    <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 && \
-		./bootstrap && \
-		./configure --enable-static --disable-debug CFLAGS="-fPIC -Wno-address-of-packed-member" && \
-		make)
-    cp $(CWD)/deps/usrsctp/usrsctplib/.libs/libusrsctp.a $(<)
+    (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" .. && make -j2 usrsctp-static)
+    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 $(BUILD_DIR)
+    cmake -G "Visual Studio 16 2019" ..
+    msbuild usrsctplib.sln /property:Configuration=$(VARIANT)
+    cd %OLDD%
+    cp $(CWD)/deps/usrsctp/$(BUILD_DIR)/usrsctplib/Release/usrsctp.lib $(<)
 }
 
-make libjuice.a : : @make_libjuice ;
+make libjuice-gnutls.a : : @make_libjuice_gnutls ;
+make libjuice-openssl.a : : @make_libjuice_openssl ;
+make juice-static.lib : : @make_libjuice_msvc ;
 
-rule make_libjuice ( targets * : sources * : properties * )
+rule make_libjuice_gnutls ( targets * : sources * : properties * )
 {
-	if <crypto>gnutls in $(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) = ""
 	{
-		MAKEOPTS on $(targets) = "USE_NETTLE=1" ;
+		# 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
 	{
-		MAKEOPTS on $(targets) = "USE_NETTLE=0" ;
+		BUILD_DIR on $(targets) += "build-openssl-$(VARIANT)" ;
+		CMAKEOPTS on $(targets) = "-DUSE_NETTLE=0" ;
 	}
 }
-actions make_libjuice
+actions make_libjuice_msvc
 {
-	(cd $(CWD)/deps/libjuice && make $(MAKEOPTS))
-    cp $(CWD)/deps/libjuice/libjuice.a $(<)
+	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

@@ -25,35 +25,35 @@ else
         LIBS+=openssl
 endif
 
-USE_JUICE ?= 0
-ifneq ($(USE_JUICE), 0)
-        CPPFLAGS+=-DUSE_JUICE=1
+USE_NICE ?= 0
+ifneq ($(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
-else
-        CPPFLAGS+=-DUSE_JUICE=0
-        LIBS+=glib-2.0 gobject-2.0 nice
 endif
 
-RTC_ENABLE_MEDIA ?= 0
-ifneq ($(RTC_ENABLE_MEDIA), 0)
+USE_SRTP ?= 0
+ifneq ($(USE_SRTP), 0)
         CPPFLAGS+=-DRTC_ENABLE_MEDIA=1
         LIBS+=srtp
 else
         CPPFLAGS+=-DRTC_ENABLE_MEDIA=0
 endif
 
-RTC_ENABLE_WEBSOCKET ?= 1
-ifneq ($(RTC_ENABLE_WEBSOCKET), 0)
+
+NO_WEBSOCKET ?= 0
+ifeq ($(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))
 

README.md

@@ -1,9 +1,8 @@
 # libdatachannel - C/C++ WebRTC Data Channels
 
-libdatachannel is a standalone implementation of WebRTC Data Channels and WebSockets in C++17 with C bindings for POSIX platforms (including Linux 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. Its API is modelled as a simplified version of the JavaScript WebRTC and WebSocket browser 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 [GnuTLS](https://www.gnutls.org/) or [OpenSSL](https://www.openssl.org/).
+- 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.
@@ -14,21 +13,25 @@ Licensed under LGPLv2, see [LICENSE](https://github.com/paullouisageneau/libdata
 
 The library aims at implementing the following communication protocols:
 
-### WebRTC Data Channel
+### 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))
+- SRTP and SRTCP key derivation from DTLS ([RFC5764](https://tools.ietf.org/html/rfc5764))
 - Multicast DNS candidates ([draft-ietf-rtcweb-mdns-ice-candidates-04](https://tools.ietf.org/html/draft-ietf-rtcweb-mdns-ice-candidates-04))
 - TURN relaying ([RFC5766](https://tools.ietf.org/html/rfc5766)) with [libnice](https://github.com/libnice/libnice) as ICE backend
-- SRTP media transport ([RFC3711](https://tools.ietf.org/html/rfc3711)) with [libSRTP](https://github.com/cisco/libsrtp)
+
+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
 
@@ -44,39 +47,91 @@ Features:
 
 ## Dependencies
 
+Dependencies:
 - GnuTLS: https://www.gnutls.org/ or OpenSSL: https://www.openssl.org/
 
-Optional:
-- libnice: https://nice.freedesktop.org/ (substituable with libjuice)
-- libSRTP: https://github.com/cisco/libsrtp
-
 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
-### Building with CMake (preferred)
+
+### Clone repository and submodules
 
 ```bash
+$ git clone https://github.com/paullouisageneau/libdatachannel.git
+$ cd libdatachannel
 $ git submodule update --init --recursive
-$ mkdir build
-$ cd build
-$ cmake -DUSE_JUICE=1 -DUSE_GNUTLS=1 ..
-$ make
 ```
 
-### Building directly with Make
+### Building with CMake
+
+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
-$ git submodule update --init --recursive
-$ make USE_JUICE=1 USE_GNUTLS=1
+$ 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/dev/include/rtc/rtc.h).
+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
 
@@ -90,12 +145,12 @@ 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 rtc::Candidate &candidate) {
+pc->onLocalCandidate([](rtc::Candidate candidate) {
     // Send the candidate to the remote peer
     MY_SEND_CANDIDATE_TO_REMOTE(candidate.candidate(), candidate.mid());
 });
@@ -131,7 +186,7 @@ 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;
     }
@@ -158,7 +213,7 @@ ws->onOpen([]() {
 	cout << "WebSocket open" << endl;
 });
 
-ws->onMessage([](const variant<binary, string> &message) {
+ws->onMessage([](variant<binary, string> message) {
     if (holds_alternative<string>(message)) {
         cout << "WebSocket received: " << get<string>(message) << endl;
     }
@@ -168,3 +223,9 @@ 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)
+

examples/README.md

@@ -1,10 +1,13 @@
 # Examples for libdatachannel
 
-This directory contains different WebRTC clients and WebSocket + JSON signaling servers.
+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

examples/client/CMakeLists.txt

@@ -3,9 +3,20 @@ if(POLICY CMP0079)
 	cmake_policy(SET CMP0079 NEW)
 endif()
 
-add_executable(datachannel-client main.cpp)
+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)
+
+if(WIN32)
+	target_link_libraries(datachannel-client datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-client datachannel)
+endif()
 target_link_libraries(datachannel-client datachannel nlohmann_json)
 

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

@@ -5,6 +5,7 @@
  * 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
@@ -29,7 +30,10 @@
 #include <memory>
 #include <random>
 #include <thread>
+#include <future>
+#include <stdexcept>
 #include <unordered_map>
+#include "parse_cl.h"
 
 using namespace rtc;
 using namespace std;
@@ -43,29 +47,57 @@ unordered_map<string, shared_ptr<PeerConnection>> peerConnectionMap;
 unordered_map<string, shared_ptr<DataChannel>> dataChannelMap;
 
 string localId;
+bool echoDataChannelMessages = false;
 
 shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
                                                 weak_ptr<WebSocket> wws, string id);
+void printReceived(bool echoed, string id, string type, size_t length);
 string randomId(size_t length);
 
-int main(int argc, char **argv) {
-	rtc::InitLogger(LogLevel::Warning);
+
+int main(int argc, char **argv) try {
+	auto params = std::make_unique<Cmdline>(argc, argv);
+
+	rtc::InitLogger(LogLevel::Debug);
 
 	Configuration config;
-	config.iceServers.emplace_back("stun:stun.l.google.com:19302"); // change to your STUN server
+	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;
 
+	echoDataChannelMessages = params->echoDataChannelMessages();
+	cout << "Received data channel messages will be "
+	     << (echoDataChannelMessages ? "echoed back to sender" : "printed to stdout") << endl;
+
 	auto ws = make_shared<WebSocket>();
 
-	ws->onOpen([]() { cout << "WebSocket connected, signaling ready" << endl; });
+	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->onError([](const string &error) { cout << "WebSocket failed: " << error << endl; });
-
-	ws->onMessage([&](const variant<binary, string> &data) {
+	ws->onMessage([&](variant<binary, string> data) {
 		if (!holds_alternative<string>(data))
 			return;
 
@@ -101,15 +133,17 @@ int main(int argc, char **argv) {
 		}
 	});
 
-	const string url = "ws://localhost:8000/" + localId;
+	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;
-	while (!ws->isOpen()) {
-		if (ws->isClosed())
-			return 1;
-		this_thread::sleep_for(100ms);
-	}
+	wsFuture.get();
 
 	while (true) {
 		string id;
@@ -137,16 +171,23 @@ int main(int argc, char **argv) {
 
 		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
 
-		dc->onMessage([id](const variant<binary, string> &message) {
-			if (!holds_alternative<string>(message))
-				return;
-
+		dc->onMessage([id, wdc = make_weak_ptr(dc)](const variant<binary, string> &message) {
+			static bool firstMessage = true;
+			if (holds_alternative<string>(message) && (!echoDataChannelMessages || firstMessage)) {
 				cout << "Message from " << id << " received: " << get<string>(message) << endl;
+				firstMessage = false;
+			} else if (echoDataChannelMessages) {
+				bool echoed = false;
+				if (auto dc = wdc.lock()) {
+					dc->send(message);
+					echoed = true;
+				}
+				printReceived(echoed, id, (holds_alternative<string>(message) ? "text" : "binary"),
+				      get<string>(message).length());
+			}
 		});
 
 		dataChannelMap.emplace(id, dc);
-
-		this_thread::sleep_for(1s);
 	}
 
 	cout << "Cleaning up..." << endl;
@@ -154,6 +195,12 @@ int main(int argc, char **argv) {
 	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
@@ -166,7 +213,7 @@ shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
 	pc->onGatheringStateChange(
 	    [](PeerConnection::GatheringState state) { cout << "Gathering State: " << state << endl; });
 
-	pc->onLocalDescription([wws, id](const Description &description) {
+	pc->onLocalDescription([wws, id](Description description) {
 		json message = {
 		    {"id", id}, {"type", description.typeString()}, {"description", string(description)}};
 
@@ -174,7 +221,7 @@ shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
 			ws->send(message.dump());
 	});
 
-	pc->onLocalCandidate([wws, id](const Candidate &candidate) {
+	pc->onLocalCandidate([wws, id](Candidate candidate) {
 		json message = {{"id", id},
 		                {"type", "candidate"},
 		                {"candidate", string(candidate)},
@@ -190,11 +237,20 @@ shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
 
 		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
 
-		dc->onMessage([id](const variant<binary, string> &message) {
-			if (!holds_alternative<string>(message))
-				return;
-
+		dc->onMessage([id, wdc = make_weak_ptr(dc)](const variant<binary, string> &message) {
+			static bool firstMessage = true;
+			if (holds_alternative<string>(message) && (!echoDataChannelMessages || firstMessage)) {
 				cout << "Message from " << id << " received: " << get<string>(message) << endl;
+				firstMessage = false;
+			} else if (echoDataChannelMessages) {
+				bool echoed = false;
+				if (auto dc = wdc.lock()) {
+					dc->send(message);
+					echoed = true;
+				}
+				printReceived(echoed, id, (holds_alternative<string>(message) ? "text" : "binary"),
+						get<string>(message).length());
+			}
 		});
 
 		dc->send("Hello from " + localId);
@@ -206,13 +262,27 @@ shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
 	return pc;
 };
 
+// Helper function to print received pings
+void printReceived(bool echoed, string id, string type, size_t length) {
+	static long count = 0;
+	static long freq = 100;
+	if (!(++count%freq)) {
+		cout << "Received " << count << " pings in total from " << id << ", most recent of type "
+		     << type << " and " << (echoed ? "" : "un") << "successfully echoed most recent ping of size "
+		     << length << " back to " << id << endl;
+		if (count >= (freq * 10) && freq < 1000000) {
+			freq *= 10;
+		}
+	}
+}
+
 // 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, characters.size() - 1);
+	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 +1,182 @@
+/******************************************************************************
+**
+** 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[] =
+  {
+    {"echo", no_argument, NULL, 'e'},
+    {"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'},
+    {"version", no_argument, NULL, 'v'},
+    {NULL, 0, NULL, 0}
+  };
+
+  _program_name += argv[0];
+
+  /* default values */
+  _e = false;
+  _n = false;
+  _s = "stun.l.google.com";
+  _t = 19302;
+  _w = "localhost";
+  _x = 8000;
+  _h = false;
+  _v = false;
+
+  optind = 0;
+  while ((c = getopt_long (argc, argv, "s:t:w:x:enhv", long_options, &optind)) != - 1)
+    {
+      switch (c)
+        {
+        case 'e': 
+          _e = true;
+          break;
+
+        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;
+
+        case 'v': 
+          _v = true;
+          this->version (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\
+   [ -e ] [ --echo ] (type=FLAG)\n\
+          Echo data channel messages back to sender rather than putting to stdout.\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\
+   [ -v ] [ --version ] (type=FLAG)\n\
+          Output version information and exit.\n";
+    }
+  exit (status);
+}
+
+void Cmdline::version (int status)
+{
+  std::cout << _program_name << " v0.5\n";
+  exit (status);
+}

examples/client/parse_cl.h

@@ -0,0 +1,74 @@
+/******************************************************************************
+**
+** 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 _e;
+  bool _n;
+  std::string _s;
+  int _t;
+  std::string _w;
+  int _x;
+  bool _h;
+  bool _v;
+
+  /* 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);
+
+  /* version function */
+  void version (int status);
+
+  /* return next (non-option) parameter */
+  int next_param () { return _optind; }
+
+  bool echoDataChannelMessages () const { return _e; }
+  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; }
+  bool v () const { return _v; }
+};
+
+#endif

examples/copy-paste-capi/CMakeLists.txt

@@ -2,7 +2,6 @@ cmake_minimum_required(VERSION 3.5.1)
 project(offerer C)
 
 set(CMAKE_C_STANDARD 11)
-set(CMAKE_C_FLAGS "-Wall -g -O2")
 
 add_executable(datachannel-copy-paste-capi-offerer offerer.c)
 set_target_properties(datachannel-copy-paste-capi-offerer PROPERTIES
@@ -13,3 +12,4 @@ 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

@@ -19,12 +19,19 @@
 
 #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
-#include <ctype.h>
+#endif
 
 typedef struct {
 	rtcState state;
@@ -34,30 +41,22 @@ typedef struct {
 	bool connected;
 } Peer;
 
-Peer *peer = NULL;
-
-static void dataChannelCallback(int dc, void *ptr);
-
-static void descriptionCallback(const char *sdp, const char *type, void *ptr);
-
-static void candidateCallback(const char *cand, const char *mid, void *ptr);
-
-static void stateChangeCallback(rtcState state, void *ptr);
-
-static void gatheringStateCallback(rtcGatheringState state, void *ptr);
-
-static void closedCallback(void *ptr);
-
-static void messageCallback(const char *message, int size, void *ptr);
-
+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);
-char* state_print(rtcState state);
-char* rtcGatheringState_print(rtcState state);
 
 int main(int argc, char **argv) {
-        rtcInitLogger(RTC_LOG_DEBUG);
+	rtcInitLogger(RTC_LOG_DEBUG, NULL);
 
 	// Create peer
 	rtcConfiguration config;
@@ -65,10 +64,8 @@ int main(int argc, char **argv) {
 
 	Peer *peer = (Peer *)malloc(sizeof(Peer));
 	if (!peer) {
-
-                printf("Error allocating memory for peer\n");
-                deletePeer(peer);
-
+		fprintf(stderr, "Error allocating memory for peer\n");
+		return -1;
 	}
 	memset(peer, 0, sizeof(Peer));
 
@@ -86,17 +83,13 @@ int main(int argc, char **argv) {
 	rtcSetUserPointer(peer->dc, NULL);
 	rtcSetDataChannelCallback(peer->pc, dataChannelCallback);
 
-
-
+	sleep(1);
 
 	bool exit = false;
-
 	while (!exit) {
-
 		printf("\n");
-                printf("***************************************************************************************\n");
-
-                // << endl
+		printf("***********************************************************************************"
+		       "****\n");
 		printf("* 0: Exit /"
 		       " 1: Enter remote description /"
 		       " 2: Enter remote candidate /"
@@ -106,15 +99,15 @@ int main(int argc, char **argv) {
 
 		int command = -1;
 		int c;
-                // int check_scan
-                if (scanf("%d", &command)) {
 
-                }else {
+		if (!scanf("%d", &command)) {
 			break;
 		}
-                while ((c = getchar()) != '\n' && c != EOF) { }
 
+		while ((c = getchar()) != '\n' && c != EOF) {
+		}
 		fflush(stdin);
+
 		switch (command) {
 		case 0: {
 			exit = true;
@@ -123,35 +116,31 @@ int main(int argc, char **argv) {
 		case 1: {
 			// Parse Description
 			printf("[Description]: ");
-
-
 			char *line = NULL;
 			size_t len = 0;
 			size_t read = 0;
-                        char *sdp = (char*) malloc(sizeof(char));
+			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);
+				sdp = (char *)realloc(sdp, (strlen(sdp) + 1) + strlen(line) + 1);
 				strcat(sdp, line);
-
 			}
-                        printf("%s\n",sdp);
+			printf("%s\n", sdp);
 			rtcSetRemoteDescription(peer->pc, sdp, "offer");
 			free(sdp);
 			free(line);
 			break;
-
 		}
 		case 2: {
 			// Parse Candidate
 			printf("[Candidate]: ");
-                        char* candidate = NULL;
+			char *candidate = NULL;
 			size_t candidate_size = 0;
 
-                        if(getline(&candidate, &candidate_size, stdin)) {
+			if (getline(&candidate, &candidate_size, stdin)) {
 				rtcAddRemoteCandidate(peer->pc, candidate, "0");
 				free(candidate);
 
-                        }else {
+			} else {
 				printf("Error reading line\n");
 				break;
 			}
@@ -160,18 +149,18 @@ int main(int argc, char **argv) {
 		}
 		case 3: {
 			// Send Message
-                        if(!peer->connected) {
+			if (!peer->connected) {
 				printf("** Channel is not Open **");
 				break;
 			}
 			printf("[Message]: ");
-                        char* message = NULL;
+			char *message = NULL;
 			size_t message_size = 0;
 
-                        if(getline(&message, &message_size, stdin)) {
+			if (getline(&message, &message_size, stdin)) {
 				rtcSendMessage(peer->dc, message, -1);
 				free(message);
-                        }else {
+			} else {
 				printf("Error reading line\n");
 				break;
 			}
@@ -179,7 +168,7 @@ int main(int argc, char **argv) {
 		}
 		case 4: {
 			// Connection Info
-                        if(!peer->connected) {
+			if (!peer->connected) {
 				printf("** Channel is not Open **");
 				break;
 			}
@@ -200,51 +189,54 @@ int main(int argc, char **argv) {
 		}
 	}
 
-
 	deletePeer(peer);
 	return 0;
 }
 
-
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+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 candidateCallback(const char *cand, const char *mid, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
 	printf("Candidate %s: %s\n", "answerer", cand);
-
 }
 
-static void stateChangeCallback(rtcState state, void *ptr) {
+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 gatheringStateCallback(rtcGatheringState state, void *ptr) {
+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 closedCallback(void *ptr) {
+static void RTC_API closedCallback(int id, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->connected = false;
-
-
 }
-static void messageCallback(const char *message, int size, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+
+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)
@@ -255,28 +247,7 @@ static void deletePeer(Peer *peer) {
 	}
 }
 
-static void dataChannelCallback(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);
-
-
-}
-int all_space(const char *str) {
-        while (*str) {
-                if (!isspace(*str++)) {
-                        return 0;
-                }
-        }
-        return 1;
-}
-
-char* state_print(rtcState state) {
+char *state_print(rtcState state) {
 	char *str = NULL;
 	switch (state) {
 	case RTC_NEW:
@@ -302,11 +273,10 @@ char* state_print(rtcState state) {
 	}
 
 	return str;
-
 }
 
-char* rtcGatheringState_print(rtcState state) {
-        char* str = NULL;
+char *rtcGatheringState_print(rtcGatheringState state) {
+	char *str = NULL;
 	switch (state) {
 	case RTC_GATHERING_NEW:
 		str = "RTC_GATHERING_NEW";
@@ -322,5 +292,14 @@ char* rtcGatheringState_print(rtcState state) {
 	}
 
 	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

@@ -19,15 +19,19 @@
 
 #include <rtc/rtc.h>
 
+#include <ctype.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h> // for sleep
-#include <ctype.h>
 
-char* state_print(rtcState state);
-char* rtcGatheringState_print(rtcState state);
+#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;
@@ -37,28 +41,22 @@ typedef struct {
 	bool connected;
 } Peer;
 
-Peer *peer = NULL;
-
-static void descriptionCallback(const char *sdp, const char *type, void *ptr);
-
-static void candidateCallback(const char *cand, const char *mid, void *ptr);
-
-static void stateChangeCallback(rtcState state, void *ptr);
-
-static void gatheringStateCallback(rtcGatheringState state, void *ptr);
-
-static void openCallback(void *ptr);
-
-static void closedCallback(void *ptr);
-
-static void messageCallback(const char *message, int size, 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 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);
+int main(int argc, char **argv) {
+	rtcInitLogger(RTC_LOG_DEBUG, NULL);
 
 	// Create peer
 	rtcConfiguration config;
@@ -66,10 +64,8 @@ int main(int argc, char **argv){
 
 	Peer *peer = (Peer *)malloc(sizeof(Peer));
 	if (!peer) {
-
-                printf("Error allocating memory for peer\n");
-                deletePeer(peer);
-
+		fprintf(stderr, "Error allocating memory for peer\n");
+		return -1;
 	}
 	memset(peer, 0, sizeof(Peer));
 
@@ -83,27 +79,20 @@ int main(int argc, char **argv){
 	rtcSetStateChangeCallback(peer->pc, stateChangeCallback);
 	rtcSetGatheringStateChangeCallback(peer->pc, gatheringStateCallback);
 
-        // Since this is the offere, we will create a datachannel
+	// 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");
-
-                // << endl
+		printf("***********************************************************************************"
+		       "****\n");
 		printf("* 0: Exit /"
 		       " 1: Enter remote description /"
 		       " 2: Enter remote candidate /"
@@ -113,12 +102,13 @@ int main(int argc, char **argv){
 
 		int command = -1;
 		int c;
-                if (scanf("%d", &command)) {
 
-                }else {
+		if (!scanf("%d", &command)) {
 			break;
 		}
-                while ((c = getchar()) != '\n' && c != EOF) { }
+
+		while ((c = getchar()) != '\n' && c != EOF) {
+		}
 		fflush(stdin);
 
 		switch (command) {
@@ -130,53 +120,49 @@ int main(int argc, char **argv){
 			// Parse Description
 			printf("[Description]: ");
 
-
 			char *line = NULL;
 			size_t len = 0;
 			size_t read = 0;
-                        char *sdp = (char*) malloc(sizeof(char));
+			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);
+				sdp = (char *)realloc(sdp, (strlen(sdp) + 1) + strlen(line) + 1);
 				strcat(sdp, line);
-
 			}
-                        printf("%s\n",sdp);
+			printf("%s\n", sdp);
 			rtcSetRemoteDescription(peer->pc, sdp, "answer");
 			free(sdp);
 			free(line);
 			break;
-
 		}
 		case 2: {
 			// Parse Candidate
 			printf("[Candidate]: ");
-                        char* candidate = NULL;
+			char *candidate = NULL;
 			size_t candidate_size = 0;
-                        if(getline(&candidate, &candidate_size, stdin)) {
+			if (getline(&candidate, &candidate_size, stdin)) {
 				rtcAddRemoteCandidate(peer->pc, candidate, "0");
 				free(candidate);
 
-                        }else {
+			} else {
 				printf("Error reading line\n");
 				break;
 			}
 
-
 			break;
 		}
 		case 3: {
 			// Send Message
-                        if(!peer->connected) {
+			if (!peer->connected) {
 				printf("** Channel is not Open **");
 				break;
 			}
 			printf("[Message]: ");
-                        char* message = NULL;
+			char *message = NULL;
 			size_t message_size = 0;
-                        if(getline(&message, &message_size, stdin)) {
+			if (getline(&message, &message_size, stdin)) {
 				rtcSendMessage(peer->dc, message, -1);
 				free(message);
-                        }else {
+			} else {
 				printf("Error reading line\n");
 				break;
 			}
@@ -185,7 +171,7 @@ int main(int argc, char **argv){
 		}
 		case 4: {
 			// Connection Info
-                        if(!peer->connected) {
+			if (!peer->connected) {
 				printf("** Channel is not Open **");
 				break;
 			}
@@ -210,60 +196,47 @@ int main(int argc, char **argv){
 	return 0;
 }
 
-
-
-
-
-
-static void descriptionCallback(const char *sdp, const char *type, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+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 candidateCallback(const char *cand, const char *mid, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+static void RTC_API candidateCallback(int pc, const char *cand, const char *mid, void *ptr) {
 	printf("Candidate %s: %s\n", "offerer", cand);
-
 }
 
-static void stateChangeCallback(rtcState state, void *ptr) {
+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 gatheringStateCallback(rtcGatheringState state, void *ptr) {
+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 openCallback(void *ptr) {
+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);
-
-
+		printf("DataChannel %s: Received with label \"%s\"\n", "offerer", buffer);
 }
 
-static void closedCallback(void *ptr) {
+static void RTC_API closedCallback(int id, void *ptr) {
 	Peer *peer = (Peer *)ptr;
 	peer->connected = false;
-
-
 }
 
-static void messageCallback(const char *message, int size, void *ptr) {
-        // Peer *peer = (Peer *)ptr;
+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)
@@ -274,17 +247,7 @@ static void deletePeer(Peer *peer) {
 	}
 }
 
-
-int all_space(const char *str) {
-        while (*str) {
-                if (!isspace(*str++)) {
-                        return 0;
-                }
-        }
-        return 1;
-}
-
-char* state_print(rtcState state) {
+char *state_print(rtcState state) {
 	char *str = NULL;
 	switch (state) {
 	case RTC_NEW:
@@ -310,11 +273,10 @@ char* state_print(rtcState state) {
 	}
 
 	return str;
-
 }
 
-char* rtcGatheringState_print(rtcState state) {
-        char* str = NULL;
+char *rtcGatheringState_print(rtcGatheringState state) {
+	char *str = NULL;
 	switch (state) {
 	case RTC_GATHERING_NEW:
 		str = "RTC_GATHERING_NEW";
@@ -330,5 +292,14 @@ char* rtcGatheringState_print(rtcState state) {
 	}
 
 	return str;
-
+}
+
+int all_space(const char *str) {
+	while (*str) {
+		if (!isspace(*str++)) {
+			return 0;
+		}
+	}
+
+	return 1;
 }

examples/copy-paste/CMakeLists.txt

@@ -4,11 +4,19 @@ 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)
+if(WIN32)
+	target_link_libraries(datachannel-copy-paste-offerer datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-copy-paste-offerer datachannel)
+endif()
 
 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)
+if(WIN32)
+	target_link_libraries(datachannel-copy-paste-answerer datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-copy-paste-answerer datachannel)
+endif()
 

examples/copy-paste/answerer.cpp

@@ -36,12 +36,12 @@ int main(int argc, char **argv) {
 
 	auto pc = std::make_shared<PeerConnection>(config);
 
-	pc->onLocalDescription([](const Description &description) {
+	pc->onLocalDescription([](Description description) {
 		cout << "Local Description (Paste this to the other peer):" << endl;
 		cout << string(description) << endl;
 	});
 
-	pc->onLocalCandidate([](const Candidate &candidate) {
+	pc->onLocalCandidate([](Candidate candidate) {
 		cout << "Local Candidate (Paste this to the other peer after the local description):"
 		     << endl;
 		cout << string(candidate) << endl << endl;
@@ -60,7 +60,7 @@ int main(int argc, char **argv) {
 
 		dc->onClosed([&]() { cout << "[DataChannel closed: " << dc->label() << "]" << endl; });
 
-		dc->onMessage([](const variant<binary, string> &message) {
+		dc->onMessage([](variant<binary, string> message) {
 			if (holds_alternative<string>(message)) {
 				cout << "[Received message: " << get<string>(message) << "]" << endl;
 			}
@@ -127,13 +127,11 @@ int main(int argc, char **argv) {
 				cout << "** Channel is not Open ** ";
 				break;
 			}
-			CandidateInfo local, remote;
+			Candidate local, remote;
 			std::optional<std::chrono::milliseconds> rtt = pc->rtt();
 			if (pc->getSelectedCandidatePair(&local, &remote)) {
-				cout << "Local: " << local.address << ":" << local.port << " " << local.type << " "
-				     << local.transportType << endl;
-				cout << "Remote: " << remote.address << ":" << remote.port << " " << remote.type
-				     << " " << remote.transportType << endl;
+				cout << "Local: " << local << endl;
+				cout << "Remote: " << remote << endl;
 				cout << "Bytes Sent:" << pc->bytesSent()
 				     << " / Bytes Received:" << pc->bytesReceived() << " / Round-Trip Time:";
 				if (rtt.has_value())

examples/copy-paste/offerer.cpp

@@ -36,12 +36,12 @@ int main(int argc, char **argv) {
 
 	auto pc = std::make_shared<PeerConnection>(config);
 
-	pc->onLocalDescription([](const Description &description) {
+	pc->onLocalDescription([](Description description) {
 		cout << "Local Description (Paste this to the other peer):" << endl;
 		cout << string(description) << endl;
 	});
 
-	pc->onLocalCandidate([](const Candidate &candidate) {
+	pc->onLocalCandidate([](Candidate candidate) {
 		cout << "Local Candidate (Paste this to the other peer after the local description):"
 		     << endl;
 		cout << string(candidate) << endl << endl;
@@ -60,7 +60,7 @@ int main(int argc, char **argv) {
 
 	dc->onClosed([&]() { cout << "[DataChannel closed: " << dc->label() << "]" << 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;
 		}
@@ -127,13 +127,11 @@ int main(int argc, char **argv) {
 				cout << "** Channel is not Open ** ";
 				break;
 			}
-			CandidateInfo local, remote;
+			Candidate local, remote;
 			std::optional<std::chrono::milliseconds> rtt = pc->rtt();
 			if (pc->getSelectedCandidatePair(&local, &remote)) {
-				cout << "Local: " << local.address << ":" << local.port << " " << local.type << " "
-				     << local.transportType << endl;
-				cout << "Remote: " << remote.address << ":" << remote.port << " " << remote.type
-				     << " " << remote.transportType << endl;
+				cout << "Local: " << local << endl;
+				cout << "Remote: " << remote << endl;
 				cout << "Bytes Sent:" << pc->bytesSent()
 				     << " / Bytes Received:" << pc->bytesReceived() << " / Round-Trip Time:";
 				if (rtt.has_value())

examples/media/CMakeLists.txt

@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.7)
+
+add_executable(datachannel-media main.cpp)
+set_target_properties(datachannel-media PROPERTIES
+        CXX_STANDARD 17
+        OUTPUT_NAME media)
+
+if(WIN32)
+    target_link_libraries(datachannel-media datachannel-static) # DLL exports only the C API
+else()
+    target_link_libraries(datachannel-media datachannel)
+endif()
+
+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 +1,15 @@
+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)
+
+if(WIN32)
+	target_link_libraries(datachannel-sfu-media datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-sfu-media datachannel)
+endif()
+
+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/signaling-server.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Signaling server example for libdatachannel
+# Python signaling server example for libdatachannel
 # Copyright (c) 2020 Paul-Louis Ageneau
 #
 # This program is free software: you can redistribute it and/or modify
@@ -63,16 +63,20 @@ async def handle_websocket(websocket, path):
             print('Client {} disconnected'.format(client_id))
 
 if __name__ == '__main__':
-    port = int(sys.argv[1]) if len(sys.argv) > 1 else 8000
+    # 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 port {}'.format(port))
-    start_server = websockets.serve(handle_websocket, '127.0.0.1', port, ssl=ssl_context)
+    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()

examples/signaling-server-rust/Cargo.toml

@@ -1,18 +1,14 @@
 [package]
-name = "webrtc_server"
+name = "libdatachannel_signaling_server_example"
 version = "0.1.0"
-authors = ["Nico Chatzi <nico.chatzigianis@focusrite.com>"]
+authors = ["Paul-Louis Ageneau"]
 edition = "2018"
 
 [dependencies]
-rocket = "0.4.4"
-rocket_cors = "0.5.0"
-serde = "1.0"
-serde_json = "1.0"
-serde_derive = "1.0"
-bincode = "1.2.1"
+tokio = { version = "*", features = ["full"] }
+tungstenite = "*"
+tokio-tungstenite = "*"
+futures-util = "*"
+futures-channel = "*"
+json = "*"
 
-[dependencies.rocket_contrib]
-version = "0.4.4"
-default-features = false
-features = ["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
+ 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.
+
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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

@@ -1,147 +1,110 @@
-#![feature(proc_macro_hygiene, decl_macro)]
+/*
+ * 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/>.
+ */
 
-#[macro_use]
-extern crate rocket;
-extern crate rocket_cors;
-#[macro_use]
-extern crate rocket_contrib;
-#[macro_use]
-extern crate serde_derive;
+extern crate tokio;
+extern crate tungstenite;
+extern crate futures_util;
+extern crate futures_channel;
+extern crate json;
 
-extern crate bincode;
+use std::env;
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
 
-use std::sync::Mutex;
+use tokio::net::{TcpListener, TcpStream};
+use tungstenite::protocol::Message;
+use tungstenite::handshake::server::{Request, Response};
 
-use rocket_contrib::json::{Json, JsonValue};
+use futures_util::{future, pin_mut, StreamExt};
+use futures_util::stream::TryStreamExt;
+use futures_channel::mpsc;
 
-use rocket::http::Method; // 1.
+type Id = String;
+type Tx = mpsc::UnboundedSender<Message>;
+type ClientsMap = Arc<Mutex<HashMap<Id, Tx>>>;
 
-use rocket_cors::{
-    AllowedHeaders, AllowedOrigins, Error, // 2.
-    Cors, CorsOptions // 3.
-};
-
-fn make_cors() -> Cors {
-    let allowed_origins = AllowedOrigins::some_exact(&[ // 4.
-        "http://localhost:8080",
-        "http://127.0.0.1:8080",
-        "http://localhost:8000",
-        "http://0.0.0.0:8000",
-    ]);
-
-    CorsOptions { // 5.
-        allowed_origins,
-        allowed_methods: vec![Method::Get, Method::Post].into_iter().map(From::from).collect(), // 1.
-        allowed_headers: AllowedHeaders::some(&[
-            "Authorization",
-            "Accept",
-            "Content-Type",
-            "User-Agent",
-            "Access-Control-Allow-Origin", // 6.
-        ]),
-        allow_credentials: true,
-        ..Default::default()
-    }
-    .to_cors()
-    .expect("error while building CORS")
-}
-
-type Data = Mutex<String>;
-
-#[derive(Serialize, Deserialize, Clone, PartialEq, Debug)]
-pub struct ChannelData {
-    pub description: String,
-    pub candidate: String,
-}
-
-impl Default for ChannelData {
-    fn default() -> ChannelData {
-        ChannelData {
-            description: "".to_owned(),
-            candidate: "".to_owned(),
-        }
-    }
-}
-
-#[post("/json", data = "<payload>")]
-fn new(payload: String, state: rocket::State<Data>) -> JsonValue {
-    let mut data = state.lock().expect("state locked");
-    *data = payload;
-    json!({ "status": "ok" })
-}
-
-#[get("/json")]
-fn get(state: rocket::State<Data>) -> Option<String> {
-    let data = state.lock().expect("state locked");
-    Some(data.clone())
-}
-
-#[catch(404)]
-fn not_found() -> JsonValue {
-    json!({
-        "status": "error",
-        "reason": "Resource was not found."
-    })
-}
-
-fn rocket() -> rocket::Rocket {
-    rocket::ignite()
-        .mount("/state", routes![new, get])
-        .register(catchers![not_found])
-        .manage(Mutex::new(String::new()))
-        .attach(make_cors())
-}
-
-fn main() {
-    rocket().launch();
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    use rocket::http::{ContentType, Status};
-    use rocket::local::Client;
-
-    #[test]
-    fn test_save_load() {
-        let data = ChannelData {
-            description: "v=0
-            o=- 3294530454 0 IN IP4 127.0.0.1
-            s=-
-            t=0 0
-            a=group:BUNDLE 0
-            m=application 9 UDP/DTLS/SCTP webrtc-datachannel
-            c=IN IP4 0.0.0.0
-            a=ice-ufrag:ntAX
-            a=ice-pwd:H59OKuJgItlvJZR5E78QYo
-            a=ice-options:trickle
-            a=mid:0
-            a=setup:actpass
-            a=dtls-id:1
-            a=fingerprint:sha-256 72:0E:8D:8C:9F:A2:E4:40:E7:2E:23:EF:F6:E7:89:94:0F:6B:78:9A:36:61:43:2C:6A:45:30:62:CB:68:B3:73
-            a=sctp-port:5000
-            a=max-message-size:262144".to_owned(),
-            candidate: "a=candidate:1 1 UDP 2122317823 10.0.1.83 55100 typ host".to_owned(),
+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);
     };
-        println!("{:?}", data);
-        let client = Client::new(rocket()).unwrap();
 
-        let res = client
-            .post("/state/json")
-            .header(ContentType::JSON)
-            .remote("127.0.0.1:8000".parse().unwrap())
-            .body(serde_json::to_vec(&data).unwrap())
-            .dispatch();
-        assert_eq!(res.status(), Status::Ok);
+    let websocket = tokio_tungstenite::accept_hdr_async(stream, callback)
+        .await.expect("WebSocket handshake failed");
+	println!("Client {} connected", &client_id);
 
-        let mut res = client
-            .get("/state/json")
-            .header(ContentType::JSON)
-            .dispatch();
-        assert_eq!(res.status(), Status::Ok);
+    let (tx, rx) = mpsc::unbounded();
+    clients.lock().unwrap().insert(client_id.clone(), tx);
 
-        let body = res.body().unwrap().into_string().unwrap();
-        println!("{}", body);
+    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/package-lock.json

@@ -4,6 +4,14 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "bufferutil": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/bufferutil/-/bufferutil-4.0.1.tgz",
+      "integrity": "sha512-xowrxvpxojqkagPcWRQVXZl0YXhRhAtBEIq3VoER1NH5Mw1n1o0ojdspp+GS2J//2gCVyrzQDApQ4unGF+QOoA==",
+      "requires": {
+        "node-gyp-build": "~3.7.0"
+      }
+    },
     "d": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/d/-/d-1.0.1.tgz",
@@ -59,9 +67,9 @@
       },
       "dependencies": {
         "type": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/type/-/type-2.0.0.tgz",
-          "integrity": "sha512-KBt58xCHry4Cejnc2ISQAF7QY+ORngsWfxezO68+12hKV6lQY8P/psIkcbjeHWn7MqcgciWJyCCevFMJdIXpow=="
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/type/-/type-2.1.0.tgz",
+          "integrity": "sha512-G9absDWvhAWCV2gmF1zKud3OyC61nZDwWvBL2DApaVFogI07CprggiQAOOjvp2NRjYWFzPyu7vwtDrQFq8jeSA=="
         }
       }
     },
@@ -75,16 +83,16 @@
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
       "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
     },
-    "nan": {
-      "version": "2.14.1",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.1.tgz",
-      "integrity": "sha512-isWHgVjnFjh2x2yuJ/tj3JbwoHu3UC2dX5G/88Cm24yB6YopVgxvBObDY7n5xW6ExmFhJpSEQqFPvq9zaXc8Jw=="
-    },
     "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=="
+    },
     "type": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/type/-/type-1.2.0.tgz",
@@ -98,15 +106,24 @@
         "is-typedarray": "^1.0.0"
       }
     },
-    "websocket": {
-      "version": "1.0.31",
-      "resolved": "https://registry.npmjs.org/websocket/-/websocket-1.0.31.tgz",
-      "integrity": "sha512-VAouplvGKPiKFDTeCCO65vYHsyay8DqoBSlzIO3fayrfOgU94lQN5a1uWVnFrMLceTJw/+fQXR5PGbUVRaHshQ==",
+    "utf-8-validate": {
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.2.tgz",
+      "integrity": "sha512-SwV++i2gTD5qh2XqaPzBnNX88N6HdyhQrNNRykvcS0QKvItV9u3vPEJr+X5Hhfb1JC0r0e1alL0iB09rY8+nmw==",
       "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",
-        "nan": "^2.14.0",
         "typedarray-to-buffer": "^3.1.5",
+        "utf-8-validate": "^5.0.2",
         "yaeti": "^0.0.6"
       }
     },

examples/web/package.json

@@ -18,6 +18,6 @@
   },
   "homepage": "https://github.com/paullouisageneau/libdatachannel#readme",
   "dependencies": {
-    "websocket": "^1.0.31"
+    "websocket": "^1.0.32"
   }
 }

examples/web/script.js

@@ -55,7 +55,7 @@ function openSignaling(url) {
     const ws = new WebSocket(url);
     ws.onopen = () => resolve(ws);
     ws.onerror = () => reject(new Error('WebSocket error'));
-    ws.onclosed = () => console.error('WebSocket disconnected');
+    ws.onclose = () => console.error('WebSocket disconnected');
     ws.onmessage = (e) => {
       if(typeof(e.data) != 'string') return;
       const message = JSON.parse(e.data);

examples/web/server.js

@@ -98,5 +98,12 @@ wsServer.on('request', (req) => {
   clients[id] = conn;
 });
 
-httpServer.listen(8000);
+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}`);
+});
 

include/rtc/candidate.hpp

@@ -25,38 +25,59 @@
 
 namespace rtc {
 
-enum class CandidateType { Host = 0, ServerReflexive, PeerReflexive, Relayed };
-enum class CandidateTransportType { Udp = 0, TcpActive, TcpPassive, TcpSo };
-struct CandidateInfo {
-	string address;
-	int port;
-	CandidateType type;
-	CandidateTransportType transportType;
-};
-
 class 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);
-	bool isResolved() const;
 
+	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;
-	string mMid;
-	bool mIsResolved;
+	void parse(string candidate);
+
+	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);
-std::ostream &operator<<(std::ostream &out, const rtc::CandidateType &type);
-std::ostream &operator<<(std::ostream &out, const rtc::CandidateTransportType &transportType);
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::Type &type);
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::TransportType &transportType);
 
 #endif
-

include/rtc/channel.hpp

@@ -20,6 +20,7 @@
 #define RTC_CHANNEL_H
 
 #include "include.hpp"
+#include "message.hpp"
 
 #include <atomic>
 #include <functional>
@@ -33,7 +34,7 @@ public:
 	virtual ~Channel() = default;
 
 	virtual void close() = 0;
-	virtual bool send(const std::variant<binary, string> &data) = 0; // returns false if buffered
+	virtual bool send(message_variant data) = 0; // returns false if buffered
 
 	virtual bool isOpen() const = 0;
 	virtual bool isClosed() const = 0;
@@ -42,24 +43,25 @@ public:
 
 	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,
-	               std::function<void(const string &data)> stringCallback);
+	void onMessage(std::function<void(message_variant data)> callback);
+	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<std::variant<binary, string>> receive() = 0; // only if onMessage unset
+	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();
 	virtual void triggerClosed();
-	virtual void triggerError(const string &error);
+	virtual void triggerError(string error);
 	virtual void triggerAvailable(size_t count);
 	virtual void triggerBufferedAmount(size_t amount);
 
@@ -68,8 +70,8 @@ protected:
 private:
 	synchronized_callback<> mOpenCallback;
 	synchronized_callback<> mClosedCallback;
-	synchronized_callback<const string &> mErrorCallback;
-	synchronized_callback<const std::variant<binary, string> &> mMessageCallback;
+	synchronized_callback<string> mErrorCallback;
+	synchronized_callback<message_variant> mMessageCallback;
 	synchronized_callback<> mAvailableCallback;
 	synchronized_callback<> mBufferedAmountLowCallback;
 
@@ -80,4 +82,3 @@ private:
 } // namespace rtc
 
 #endif // RTC_CHANNEL_H
-

include/rtc/datachannel.hpp

@@ -36,21 +36,20 @@ namespace rtc {
 class SctpTransport;
 class PeerConnection;
 
-class DataChannel final : public std::enable_shared_from_this<DataChannel>, public Channel {
+class DataChannel : public std::enable_shared_from_this<DataChannel>, public Channel {
 public:
-	DataChannel(std::weak_ptr<PeerConnection> pc, unsigned int stream, string label,
-	            string protocol, Reliability reliability);
-	DataChannel(std::weak_ptr<PeerConnection> pc, std::weak_ptr<SctpTransport> transport,
-	            unsigned int stream);
-	~DataChannel();
+	DataChannel(std::weak_ptr<PeerConnection> pc, uint16_t stream, string label, string protocol,
+	            Reliability reliability);
+	virtual ~DataChannel();
 
-	unsigned int stream() const;
+	uint16_t stream() const;
+	uint16_t id() const;
 	string label() const;
 	string protocol() const;
 	Reliability reliability() const;
 
 	void close(void) override;
-	bool send(const std::variant<binary, string> &data) override;
+	bool send(message_variant data) override;
 	bool send(const byte *data, size_t size);
 	template <typename Buffer> bool sendBuffer(const Buffer &buf);
 	template <typename Iterator> bool sendBuffer(Iterator first, Iterator last);
@@ -61,19 +60,20 @@ public:
 
 	// Extended API
 	size_t availableAmount() const override;
-	std::optional<std::variant<binary, string>> receive() override;
+	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
 
-private:
+protected:
+	virtual void open(std::shared_ptr<SctpTransport> transport);
+	virtual void processOpenMessage(message_ptr message);
 	void remoteClose();
-	void open(std::shared_ptr<SctpTransport> transport);
 	bool outgoing(message_ptr message);
 	void incoming(message_ptr message);
-	void processOpenMessage(message_ptr message);
 
 	const std::weak_ptr<PeerConnection> mPeerConnection;
 	std::weak_ptr<SctpTransport> mSctpTransport;
 
-	unsigned int mStream;
+	uint16_t mStream;
 	string mLabel;
 	string mProtocol;
 	std::shared_ptr<Reliability> mReliability;
@@ -81,11 +81,27 @@ private:
 	std::atomic<bool> mIsOpen = false;
 	std::atomic<bool> mIsClosed = false;
 
+private:
 	Queue<message_ptr> mRecvQueue;
 
 	friend class PeerConnection;
 };
 
+class 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;
@@ -108,8 +124,8 @@ template <typename Iterator> bool DataChannel::sendBuffer(Iterator first, Iterat
 	auto message = std::make_shared<Message>(size);
 	auto pos = message->begin();
 	for (Iterator it = first; it != last; ++it) {
-		auto [bytes, size] = to_bytes(*it);
-		pos = std::copy(bytes, bytes + size, pos);
+		auto [bytes, len] = to_bytes(*it);
+		pos = std::copy(bytes, bytes + len, pos);
 	}
 	return outgoing(message);
 }

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
@@ -24,81 +25,228 @@
 
 #include <iostream>
 #include <map>
+#include <memory>
 #include <optional>
+#include <variant>
 #include <vector>
 
 namespace rtc {
 
 class Description {
 public:
-	enum class Type { Unspec = 0, Offer = 1, Answer = 2 };
-	enum class Role { ActPass = 0, Passive = 1, Active = 2 };
+	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, const string &typeString = "");
-	Description(const string &sdp, Type type);
-	Description(const string &sdp, Type type, Role role);
+	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 dataMid() const;
+	string bundleMid() const;
+	std::optional<string> iceUfrag() const;
+	std::optional<string> icePwd() const;
 	std::optional<string> fingerprint() const;
-	std::optional<uint16_t> sctpPort() const;
-	std::optional<size_t> maxMessageSize() const;
 	bool ended() const;
 
 	void hintType(Type type);
 	void setFingerprint(string fingerprint);
-	void setSctpPort(uint16_t port);
-	void setMaxMessageSize(size_t size);
 
+	bool hasCandidate(const Candidate &candidate) const;
 	void addCandidate(Candidate candidate);
+	void addCandidates(std::vector<Candidate> candidates);
 	void endCandidates();
 	std::vector<Candidate> extractCandidates();
 
-	bool hasMedia() const;
-	void addMedia(const Description &source);
+	operator string() const;
+	string generateSdp(string_view eol) const;
+	string generateApplicationSdp(string_view eol) const;
+
+	class Entry {
+	public:
+		virtual ~Entry() = default;
+
+		virtual string type() const { return mType; }
+		virtual string description() const { return mDescription; }
+		virtual string mid() const { return mMid; }
+		Direction direction() const { return mDirection; }
+		void setDirection(Direction dir);
 
 		operator string() const;
-	string generateSdp(const string &eol) const;
+		string generateSdp(string_view eol, string_view addr, string_view port) const;
 
-private:
-	Type mType;
-	Role mRole;
-	string mSessionId;
-	string mIceUfrag, mIcePwd;
-	std::optional<string> mFingerprint;
+		virtual void parseSdpLine(string_view line);
 
-	// Data
-	struct Data {
-		string mid;
-		std::optional<uint16_t> sctpPort;
-		std::optional<size_t> maxMessageSize;
+		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 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;
 	};
-	Data mData;
 
 	// Media (non-data)
-	struct Media {
-		Media(const string &mline);
-		string type;
-		string description;
-		string mid;
-		std::vector<string> attributes;
+	class 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::string name);
+		void addSSRC(uint32_t ssrc);
+		void replaceSSRC(uint32_t oldSSRC, uint32_t ssrc, string name);
+		bool hasSSRC(uint32_t ssrc);
+		std::vector<uint32_t> getSSRCs();
+
+		void setBitrate(int bitrate);
+		int getBitrate() const;
+
+		bool hasPayloadType(int payloadType) const;
+
+		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(std::string attr) { fmtps.emplace_back(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<string, Media> mMedia; // by mid
+
+		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);
+	};
+
+	class Audio : public Media {
+	public:
+		Audio(string mid = "audio", Direction dir = Direction::SendOnly);
+
+		void addAudioCodec(int payloadType, const string &codec);
+		void addOpusCodec(int payloadType);
+	};
+
+	class Video : public Media {
+	public:
+		Video(string mid = "video", Direction dir = Direction::SendOnly);
+
+		void addVideoCodec(int payloadType, const string &codec);
+		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);
+
+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;
-
-	static Type stringToType(const string &typeString);
-	static string typeToString(Type type);
-	static string roleToString(Role role);
 };
 
 } // namespace rtc
 
 std::ostream &operator<<(std::ostream &out, const rtc::Description &description);
+std::ostream &operator<<(std::ostream &out, rtc::Description::Type type);
+std::ostream &operator<<(std::ostream &out, rtc::Description::Role role);
 
 #endif

include/rtc/include.hpp

@@ -29,7 +29,7 @@
 
 #ifdef _WIN32
 #ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0602
+#define _WIN32_WINNT 0x0602 // Windows 8
 #endif
 #endif
 
@@ -41,12 +41,14 @@
 #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;
@@ -64,9 +66,13 @@ 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) {
@@ -79,22 +85,54 @@ template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t,
 	};
 }
 
-template <typename... P> class synchronized_callback {
+// 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(std::function<void(P...)> func) { *this = std::move(func); }
+	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=(std::function<void(P...)> func) {
+	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()(P... args) const {
+	void operator()(Args... args) const {
 		std::lock_guard lock(mutex);
 		if (callback)
-			callback(args...);
+			callback(std::move(args)...);
 	}
 
 	operator bool() const {
@@ -102,10 +140,14 @@ public:
 		return callback ? true : false;
 	}
 
+	std::function<void(Args...)> wrap() const {
+		return [this](Args... args) { (*this)(std::move(args)...); };
+	}
+
 private:
-	std::function<void(P...)> callback;
+	std::function<void(Args...)> callback;
 	mutable std::recursive_mutex mutex;
 };
-}
+} // namespace rtc
 
 #endif

include/rtc/init.hpp

@@ -25,12 +25,12 @@
 
 namespace rtc {
 
-class Init;
-using init_token = std::shared_ptr<Init>;
+using init_token = std::shared_ptr<void>;
 
 class Init {
 public:
 	static init_token Token();
+	static void Preload();
 	static void Cleanup();
 
 	~Init();
@@ -38,11 +38,13 @@ public:
 private:
 	Init();
 
-	static std::weak_ptr<Init> Weak;
-	static init_token Global;
-	static std::mutex Mutex;
+	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

include/rtc/log.hpp

@@ -49,6 +49,6 @@ enum class LogLevel { // Don't change, it must match plog severity
 
 void InitLogger(LogLevel level);
 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
@@ -24,6 +24,8 @@
 
 #include <functional>
 #include <memory>
+#include <optional>
+#include <variant>
 
 namespace rtc {
 
@@ -37,6 +39,8 @@ struct Message : binary {
 	Message(Iterator begin_, Iterator end_, Type type_ = Binary)
 	    : binary(begin_, end_), type(type_) {}
 
+	Message(binary &&data, Type type_ = Binary) : binary(std::move(data)), type(type_) {}
+
 	Type type;
 	unsigned int stream = 0;
 	std::shared_ptr<Reliability> reliability;
@@ -44,8 +48,9 @@ struct Message : binary {
 
 using message_ptr = std::shared_ptr<Message>;
 using message_callback = std::function<void(message_ptr message)>;
+using message_variant = std::variant<binary, string>;
 
-constexpr auto message_size_func = [](const message_ptr &m) -> size_t {
+inline size_t message_size_func(const message_ptr &m) {
 	return m->type == Message::Binary || m->type == Message::String ? m->size() : 0;
 };
 
@@ -59,14 +64,16 @@ message_ptr make_message(Iterator begin, Iterator end, Message::Type type = Mess
 	return message;
 }
 
-inline message_ptr make_message(size_t size, Message::Type type = Message::Binary,
+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) {
-	auto message = std::make_shared<Message>(size, type);
-	message->stream = stream;
-	message->reliability = reliability;
-	return message;
-}
+                         std::shared_ptr<Reliability> reliability = nullptr);
+
+message_ptr make_message(message_variant data);
+
+message_variant to_variant(Message &&message);
 
 } // namespace rtc
 

include/rtc/peerconnection.hpp

@@ -28,6 +28,7 @@
 #include "message.hpp"
 #include "reliability.hpp"
 #include "rtc.hpp"
+#include "track.hpp"
 
 #include <atomic>
 #include <functional>
@@ -41,6 +42,7 @@
 namespace rtc {
 
 class Certificate;
+class Processor;
 class IceTransport;
 class DtlsTransport;
 class SctpTransport;
@@ -48,6 +50,13 @@ class SctpTransport;
 using certificate_ptr = std::shared_ptr<Certificate>;
 using future_certificate_ptr = std::shared_future<certificate_ptr>;
 
+struct DataChannelInit {
+	Reliability reliability = {};
+	bool negotiated = false;
+	std::optional<uint16_t> id = nullopt;
+	string protocol = "";
+};
+
 class PeerConnection final : public std::enable_shared_from_this<PeerConnection> {
 public:
 	enum class State : int {
@@ -65,7 +74,15 @@ public:
 		Complete = RTC_GATHERING_COMPLETE
 	};
 
-	PeerConnection(void);
+	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();
 
@@ -74,23 +91,32 @@ public:
 	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 setLocalDescription(std::optional<Description> description = nullopt);
 	void setRemoteDescription(Description description);
 	void addRemoteCandidate(Candidate candidate);
 
-	std::shared_ptr<DataChannel> createDataChannel(const string &label, const string &protocol = "",
-	                                               const Reliability &reliability = {});
+	std::shared_ptr<DataChannel> addDataChannel(string label, DataChannelInit init = {});
+
+	// 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 onLocalCandidate(std::function<void(const Candidate &candidate)> callback);
+	void onLocalDescription(std::function<void(Description description)> 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();
@@ -98,18 +124,12 @@ public:
 	size_t bytesReceived();
 	std::optional<std::chrono::milliseconds> rtt();
 
-	// Media
-	bool hasMedia() const;
-	void sendMedia(const binary &packet);
-	void send(const byte *packet, size_t size);
-
-	void onMedia(std::function<void(const binary &packet)> callback);
-
-	// libnice only
-	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
+	// 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:
-	std::shared_ptr<IceTransport> initIceTransport(Description::Role role);
+	std::shared_ptr<IceTransport> initIceTransport();
 	std::shared_ptr<DtlsTransport> initDtlsTransport();
 	std::shared_ptr<SctpTransport> initSctpTransport();
 	void closeTransports();
@@ -119,55 +139,72 @@ private:
 	void forwardMessage(message_ptr message);
 	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, const string &label,
-	                                                const string &protocol,
-	                                                const Reliability &reliability);
+	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(Candidate candidate);
+	void processRemoteDescription(Description description);
+	void processRemoteCandidate(Candidate candidate);
 	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 future_certificate_ptr mCertificate;
-
-	init_token mInitToken = Init::Token();
+	const std::unique_ptr<Processor> mProcessor;
 
 	std::optional<Description> mLocalDescription, mRemoteDescription;
-	mutable std::recursive_mutex mLocalDescriptionMutex, mRemoteDescriptionMutex;
+	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::shared_mutex mDataChannelsMutex;
+	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::unordered_map<uint32_t, string> mMidFromSsrc; // cache
 
 	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<const Description &> mLocalDescriptionCallback;
-	synchronized_callback<const Candidate &> mLocalCandidateCallback;
+	synchronized_callback<Description> mLocalDescriptionCallback;
+	synchronized_callback<Candidate> mLocalCandidateCallback;
 	synchronized_callback<State> mStateChangeCallback;
 	synchronized_callback<GatheringState> mGatheringStateChangeCallback;
-	synchronized_callback<const binary &> mMediaCallback;
+	synchronized_callback<SignalingState> mSignalingStateChangeCallback;
+	synchronized_callback<std::shared_ptr<Track>> mTrackCallback;
 };
 
 } // namespace rtc
 
-std::ostream &operator<<(std::ostream &out, const rtc::PeerConnection::State &state);
-std::ostream &operator<<(std::ostream &out, const rtc::PeerConnection::GatheringState &state);
+std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::State state);
+std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::GatheringState state);
+std::ostream &operator<<(std::ostream &out, rtc::PeerConnection::SignalingState state);
 
 #endif

include/rtc/queue.hpp

@@ -38,16 +38,22 @@ public:
 	~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;
@@ -75,11 +81,21 @@ template <typename T> void Queue<T>::stop() {
 	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();
@@ -93,43 +109,32 @@ template <typename T> size_t Queue<T>::amount() const {
 template <typename T> void Queue<T>::push(T element) {
 	std::unique_lock lock(mMutex);
 	mPushCondition.wait(lock, [this]() { return !mLimit || mQueue.size() < mLimit || mStopping; });
-	if (!mStopping) {
-		mAmount += mAmountFunction(element);
-		mQueue.emplace(std::move(element));
-		mPopCondition.notify_one();
-	}
+	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; });
-	if (!mQueue.empty()) {
-		mAmount -= mAmountFunction(mQueue.front());
-		std::optional<T> element{std::move(mQueue.front())};
-		mQueue.pop();
-		return element;
-	} else {
-		return nullopt;
-	}
+	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);
-	if (!mQueue.empty()) {
-		return std::optional<T>{mQueue.front()};
-	} else {
-		return nullopt;
-	}
+	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()) {
-		std::swap(mQueue.front(), element);
-		return std::optional<T>{element};
-	} else {
+	if (mQueue.empty())
 		return nullopt;
-	}
+
+	std::swap(mQueue.front(), element);
+	return std::make_optional(std::move(element));
 }
 
 template <typename T>
@@ -139,10 +144,29 @@ bool Queue<T>::wait(const std::optional<std::chrono::milliseconds> &duration) {
 		mPopCondition.wait_for(lock, *duration, [this]() { return !mQueue.empty() || mStopping; });
 	else
 		mPopCondition.wait(lock, [this]() { return !mQueue.empty() || mStopping; });
-	return !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 {
-		TYPE_RELIABLE = 0x00,
-		TYPE_PARTIAL_RELIABLE_REXMIT = 0x01,
-		TYPE_PARTIAL_RELIABLE_TIMED = 0x02,
-	};
+	enum class Type { Reliable = 0, Rexmit, Timed };
 
-	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

@@ -23,18 +23,27 @@
 extern "C" {
 #endif
 
-#include <stdint.h>
-
-// libdatachannel C API
-
-#ifndef RTC_ENABLE_MEDIA
-#define RTC_ENABLE_MEDIA 1
+#ifdef _WIN32
+#define RTC_EXPORT __declspec(dllexport)
+#ifdef CAPI_STDCALL
+#define RTC_API __stdcall
+#else
+#define RTC_API
+#endif
+#else // not WIN32
+#define RTC_EXPORT
+#define RTC_API
 #endif
 
 #ifndef RTC_ENABLE_WEBSOCKET
 #define RTC_ENABLE_WEBSOCKET 1
 #endif
 
+#include <stdbool.h>
+#include <stdint.h>
+
+// libdatachannel C API
+
 typedef enum {
 	RTC_NEW = 0,
 	RTC_CONNECTING = 1,
@@ -50,6 +59,14 @@ typedef enum {
 	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,
@@ -60,6 +77,12 @@ typedef enum { // Don't change, it must match plog severity
 	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;
@@ -67,70 +90,121 @@ typedef struct {
 	uint16_t portRangeEnd;
 } rtcConfiguration;
 
-typedef void (*dataChannelCallbackFunc)(int dc, void *ptr);
-typedef void (*descriptionCallbackFunc)(const char *sdp, const char *type, void *ptr);
-typedef void (*candidateCallbackFunc)(const char *cand, const char *mid, void *ptr);
-typedef void (*stateChangeCallbackFunc)(rtcState state, void *ptr);
-typedef void (*gatheringStateCallbackFunc)(rtcGatheringState state, void *ptr);
-typedef void (*openCallbackFunc)(void *ptr);
-typedef void (*closedCallbackFunc)(void *ptr);
-typedef void (*errorCallbackFunc)(const char *error, void *ptr);
-typedef void (*messageCallbackFunc)(const char *message, int size, void *ptr);
-typedef void (*bufferedAmountLowCallbackFunc)(void *ptr);
-typedef void (*availableCallbackFunc)(void *ptr);
+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
-void rtcInitLogger(rtcLogLevel level);
+// NULL cb on the first call will log to stdout
+RTC_EXPORT void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb);
 
 // User pointer
-void rtcSetUserPointer(int id, void *ptr);
+RTC_EXPORT void rtcSetUserPointer(int id, void *ptr);
 
 // PeerConnection
-int rtcCreatePeerConnection(const rtcConfiguration *config); // returns pc id
-int rtcDeletePeerConnection(int pc);
+RTC_EXPORT int rtcCreatePeerConnection(const rtcConfiguration *config); // returns pc id
+RTC_EXPORT int rtcDeletePeerConnection(int pc);
 
-int rtcSetDataChannelCallback(int pc, dataChannelCallbackFunc cb);
-int rtcSetLocalDescriptionCallback(int pc, descriptionCallbackFunc cb);
-int rtcSetLocalCandidateCallback(int pc, candidateCallbackFunc cb);
-int rtcSetStateChangeCallback(int pc, stateChangeCallbackFunc cb);
-int rtcSetGatheringStateChangeCallback(int pc, gatheringStateCallbackFunc cb);
+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);
 
-int rtcSetRemoteDescription(int pc, const char *sdp, const char *type);
-int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid);
+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);
 
-int rtcGetLocalAddress(int pc, char *buffer, int size);
-int rtcGetRemoteAddress(int pc, char *buffer, int size);
+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
-int rtcCreateDataChannel(int pc, const char *label); // returns dc id
-int rtcDeleteDataChannel(int dc);
+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);
 
-int rtcGetDataChannelLabel(int dc, char *buffer, int size);
+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
-int rtcCreateWebSocket(const char *url); // returns ws id
-int rtcDeleteWebsocket(int ws);
+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 and WebSocket common API
-int rtcSetOpenCallback(int id, openCallbackFunc cb);
-int rtcSetClosedCallback(int id, closedCallbackFunc cb);
-int rtcSetErrorCallback(int id, errorCallbackFunc cb);
-int rtcSetMessageCallback(int id, messageCallbackFunc cb);
-int rtcSendMessage(int id, const char *data, int size);
+// 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);
 
-int rtcGetBufferedAmount(int id); // total size buffered to send
-int rtcSetBufferedAmountLowThreshold(int id, int amount);
-int rtcSetBufferedAmountLowCallback(int id, bufferedAmountLowCallbackFunc cb);
+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 and WebSocket common extended API
-int rtcGetAvailableAmount(int id); // total size available to receive
-int rtcSetAvailableCallback(int id, availableCallbackFunc cb);
-int rtcReceiveMessage(int id, char *buffer, int *size);
+// 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);
 
-// Cleanup
-void rtcCleanup();
+// Optional preload and cleanup
+RTC_EXPORT void rtcPreload(void);
+RTC_EXPORT void rtcCleanup(void);
 
 #ifdef __cplusplus
 } // extern "C"

include/rtc/rtc.hpp

@@ -27,4 +27,3 @@
 
 // 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 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 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 +1,505 @@
+/**
+ * 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 <rtc/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 ((char *)&csrc) - ((char *)this) + sizeof(SSRC) * csrcCount();
+	}
+
+	char *getBody() const { return ((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 ssrc) { _ssrc = htonl(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 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(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 ssrc) { this->ssrc = htonl(ssrc); }
+	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;
+	}
+	inline unsigned int getLossPercentage() const {
+		// TODO Implement loss percentages.
+		return 0;
+	}
+	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); }
+	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);
+	}
+	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);
+	}
+
+	inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
+	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:
+	inline RTCP_ReportBlock *getReportBlock(int num) { return &_reportBlocks + num; }
+	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 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, bitrate);
+	}
+
+	void setBitrate(unsigned int numSSRC, unsigned int bitrate) {
+		unsigned int exp = 0;
+		while (bitrate > pow(2, 18) - 1) {
+			exp++;
+			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)) | 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 + 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()));
+	}
+
+	char *getBody() { return header.getBody() + sizeof(uint16_t); }
+
+	size_t getBodySize(size_t totalSize) { return totalSize - ((char *)getBody() - (char *)this); }
+
+	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 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);
+
+	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
+
+	bool outgoing(message_ptr message);
+	void incoming(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

@@ -47,21 +47,26 @@ public:
 		Closed = 3,
 	};
 
-	WebSocket();
+	struct Configuration {
+		bool disableTlsVerification = false; // if true, don't verify the TLS certificate
+	};
+
+	WebSocket(std::optional<Configuration> config = nullopt);
 	~WebSocket();
 
 	State readyState() const;
 
 	void open(const string &url);
 	void close() override;
-	bool send(const std::variant<binary, string> &data) override;
+	bool send(const message_variant data) override;
 
 	bool isOpen() const override;
 	bool isClosed() const override;
 	size_t maxMessageSize() const override;
 
 	// Extended API
-	std::optional<std::variant<binary, string>> receive() override;
+	std::optional<message_variant> receive() override;
+	std::optional<message_variant> peek() override;
 	size_t availableAmount() const override; // total size available to receive
 
 private:
@@ -82,6 +87,7 @@ private:
 	std::shared_ptr<WsTransport> mWsTransport;
 	std::recursive_mutex mInitMutex;
 
+	const Configuration mConfig;
 	string mScheme, mHost, mHostname, mService, mPath;
 	std::atomic<State> mState = State::Closed;
 

src/base64.cpp

@@ -25,8 +25,7 @@ namespace rtc {
 using std::to_integer;
 
 string to_base64(const binary &data) {
-	static const char tab[] =
-	    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+	static const char tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
 	string out;
 	out.reserve(3 * ((data.size() + 3) / 4));
@@ -42,7 +41,7 @@ string to_base64(const binary &data) {
 		i += 3;
 	}
 
-	int left = data.size() - i;
+	int left = int(data.size() - i);
 	if (left) {
 		auto d0 = to_integer<uint8_t>(data[i]);
 		out += tab[d0 >> 2];

src/candidate.cpp

@@ -20,13 +20,16 @@
 
 #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
 
@@ -37,53 +40,117 @@ 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) : mIsResolved(false) {
+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)
-		if (hasprefix(candidate, prefix))
+	for (const string &prefix : prefixes)
+		if (match_prefix(candidate, prefix))
 			candidate.erase(0, prefix.size());
 
-	mCandidate = std::move(candidate);
-	mMid = std::move(mid);
+	PLOG_VERBOSE << "Parsing candidate: " << candidate;
+
+	// See RFC 8445 for format
+	std::istringstream iss(candidate);
+	string transport, typ_, type;
+	if (!(iss >> mFoundation >> mComponent >> mTransportString >> mPriority &&
+	      iss >> mNode >> mService >> typ_ >> mTypeString && typ_ == "typ"))
+		throw std::invalid_argument("Invalid candidate format");
+
+	std::getline(iss, mTail);
+	trim_begin(mTail);
+	trim_end(mTail);
+
+	if (auto it = TypeMap.find(type); it != TypeMap.end())
+		mType = it->second;
+	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 iss(mTail);
+		string tcptype_, tcptype;
+		if (iss >> tcptype_ >> tcptype && tcptype_ == "tcptype") {
+			if (auto it = TcpTypeMap.find(tcptype); it != TcpTypeMap.end())
+				mTransportType = it->second;
+			else
+				mTransportType = TransportType::TcpUnknown;
+
+		} else {
+			mTransportType = TransportType::TcpUnknown;
+		}
+	} else {
+		mTransportType = TransportType::Unknown;
+	}
+}
+
+void Candidate::hintMid(string mid) {
+	if (!mMid)
+		mMid.emplace(std::move(mid));
 }
 
 bool Candidate::resolve(ResolveMode mode) {
-	if (mIsResolved)
-		return true;
-
 	PLOG_VERBOSE << "Resolving candidate (mode="
-				 << (mode == ResolveMode::Simple ? "simple" : "lookup")
-				 << "): " << mCandidate;
+	             << (mode == ResolveMode::Simple ? "simple" : "lookup") << "): " << mNode << ' '
+	             << mService;
 
-	// See RFC 8445 for format
-	std::istringstream iss(mCandidate);
-	int component{0}, priority{0};
-	string foundation, transport, node, service, typ_, type;
-	if (iss >> foundation >> component >> transport >> priority &&
-	    iss >> node >> service >> typ_ >> type && typ_ == "typ") {
-
-		string left;
-		std::getline(iss, left);
-
-		// Try to resolve the node
+	// Try to resolve the node and service
 	struct addrinfo hints = {};
 	hints.ai_family = AF_UNSPEC;
 	hints.ai_flags = AI_ADDRCONFIG;
-		if (transport == "UDP" || transport == "udp") {
+	if (mTransportType == TransportType::Udp) {
 		hints.ai_socktype = SOCK_DGRAM;
 		hints.ai_protocol = IPPROTO_UDP;
-		}
-
-		if (transport == "TCP" || transport == "tcp") {
+	} else if (mTransportType != TransportType::Unknown) {
 		hints.ai_socktype = SOCK_STREAM;
 		hints.ai_protocol = IPPROTO_TCP;
 	}
@@ -92,23 +159,20 @@ bool Candidate::resolve(ResolveMode mode) {
 		hints.ai_flags |= AI_NUMERICHOST;
 
 	struct addrinfo *result = nullptr;
-		if (getaddrinfo(node.c_str(), service.c_str(), &hints, &result) == 0) {
-			for (auto p = result; p; p = p->ai_next)
+	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) {
-					// Rewrite the candidate
 				char nodebuffer[MAX_NUMERICNODE_LEN];
 				char servbuffer[MAX_NUMERICSERV_LEN];
-					if (getnameinfo(p->ai_addr, p->ai_addrlen, nodebuffer, MAX_NUMERICNODE_LEN,
-					                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) {
-						const char sp{' '};
-						std::ostringstream oss;
-						oss << foundation << sp << component << sp << transport << sp << priority;
-						oss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
-						oss << left;
-						mCandidate = oss.str();
-						PLOG_VERBOSE << "Resolved candidate: " << mCandidate;
-						return mIsResolved = true;
+
+					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;
 				}
 			}
 		}
@@ -116,14 +180,34 @@ bool Candidate::resolve(ResolveMode mode) {
 		freeaddrinfo(result);
 	}
 
-	return false;
+	return mFamily != Family::Unresolved;
 }
 
-bool Candidate::isResolved() const { return mIsResolved; }
+Candidate::Type Candidate::type() const { return mType; }
 
-string Candidate::candidate() const { return "candidate:" + mCandidate; }
+Candidate::TransportType Candidate::transportType() const { return mTransportType; }
 
-string Candidate::mid() const { return mMid; }
+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;
@@ -131,38 +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::CandidateType &type) {
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::Type &type) {
 	switch (type) {
-	case rtc::CandidateType::Host:
-		return out << "Host";
-	case rtc::CandidateType::PeerReflexive:
-		return out << "PeerReflexive";
-	case rtc::CandidateType::Relayed:
-		return out << "Relayed";
-	case rtc::CandidateType::ServerReflexive:
-		return out << "ServerReflexive";
+	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";
+		return out << "unknown";
 	}
 }
 
-std::ostream &operator<<(std::ostream &out, const rtc::CandidateTransportType &transportType) {
+std::ostream &operator<<(std::ostream &out, const rtc::Candidate::TransportType &transportType) {
 	switch (transportType) {
-	case rtc::CandidateTransportType::TcpActive:
-		return out << "TcpActive";
-	case rtc::CandidateTransportType::TcpPassive:
-		return out << "TcpPassive";
-	case rtc::CandidateTransportType::TcpSo:
-		return out << "TcpSo";
-	case rtc::CandidateTransportType::Udp:
-		return out << "Udp";
+	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";
+		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>
@@ -98,7 +99,11 @@ certificate_ptr make_certificate_impl(string commonName) {
 	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);
 
+#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);
+#endif
 	gnutls::check(gnutls_x509_privkey_generate(*privkey, GNUTLS_PK_RSA, bits, 0),
 	              "Unable to generate key pair");
 
@@ -132,14 +137,14 @@ namespace rtc {
 
 Certificate::Certificate(string crt_pem, string key_pem) {
 	BIO *bio = BIO_new(BIO_s_mem());
-	BIO_write(bio, crt_pem.data(), crt_pem.size());
+	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(), key_pem.size());
+	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)
@@ -148,15 +153,16 @@ Certificate::Certificate(string crt_pem, string 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))
-{
+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()}; }
+std::tuple<X509 *, EVP_PKEY *> Certificate::credentials() const {
+	return {mX509.get(), mPKey.get()};
+}
 
 string make_fingerprint(X509 *x509) {
 	const size_t size = 32;
@@ -189,7 +195,11 @@ certificate_ptr make_certificate_impl(string commonName) {
 	if (!x509 || !pkey || !rsa || !exponent || !serial_number || !name)
 		throw std::runtime_error("Unable allocate structures for certificate generation");
 
-	const int bits = 4096;
+#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) ||
@@ -201,8 +211,8 @@ certificate_ptr make_certificate_impl(string commonName) {
 	auto *commonNameBytes =
 	    reinterpret_cast<unsigned char *>(const_cast<char *>(commonName.c_str()));
 
-	if (!X509_gmtime_adj(X509_get_notBefore(x509.get()), 3600 * -1) ||
-	    !X509_gmtime_adj(X509_get_notAfter(x509.get()), 3600 * 24 * 365) ||
+	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())) ||
@@ -230,19 +240,6 @@ namespace rtc {
 
 namespace {
 
-// Helper function roughly equivalent to std::async with policy std::launch::async
-// since std::async might be unreliable on some platforms (e.g. Mingw32 on Windows)
-template <class F, class... Args>
-std::future<std::result_of_t<std::decay_t<F>(std::decay_t<Args>...)>> thread_call(F &&f,
-                                                                                  Args &&... args) {
-	using R = std::result_of_t<std::decay_t<F>(std::decay_t<Args>...)>;
-	std::packaged_task<R()> task(std::bind(f, std::forward<Args>(args)...));
-	std::future<R> future = task.get_future();
-	std::thread t(std::move(task));
-	t.detach();
-	return future;
-}
-
 static std::unordered_map<string, future_certificate_ptr> CertificateCache;
 static std::mutex CertificateCacheMutex;
 
@@ -254,7 +251,7 @@ future_certificate_ptr make_certificate(string commonName) {
 	if (auto it = CertificateCache.find(commonName); it != CertificateCache.end())
 		return it->second;
 
-	auto future = thread_call(make_certificate_impl, commonName);
+	auto future = ThreadPool::Instance().enqueue(make_certificate_impl, commonName);
 	auto shared = future.share();
 	CertificateCache.emplace(std::move(commonName), shared);
 	return shared;

src/certificate.hpp

@@ -61,7 +61,7 @@ string make_fingerprint(X509 *x509);
 using certificate_ptr = std::shared_ptr<Certificate>;
 using future_certificate_ptr = std::shared_future<certificate_ptr>;
 
-future_certificate_ptr make_certificate(string commonName); // cached
+future_certificate_ptr make_certificate(string commonName = "libdatachannel"); // cached
 
 void CleanupCertificateCache();
 

src/channel.cpp

@@ -26,19 +26,13 @@ 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::onOpen(std::function<void()> callback) { mOpenCallback = callback; }
 
-void Channel::onClosed(std::function<void()> callback) {
-	mClosedCallback = callback;
-}
+void Channel::onClosed(std::function<void()> callback) { mClosedCallback = callback; }
 
-void Channel::onError(std::function<void(const string &error)> callback) {
-	mErrorCallback = callback;
-}
+void Channel::onError(std::function<void(string error)> 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
@@ -46,10 +40,10 @@ void Channel::onMessage(std::function<void(const std::variant<binary, string> &d
 		mMessageCallback(*message);
 }
 
-void Channel::onMessage(std::function<void(const binary &data)> binaryCallback,
-                        std::function<void(const string &data)> stringCallback) {
-	onMessage([binaryCallback, stringCallback](const std::variant<binary, string> &data) {
-		std::visit(overloaded{binaryCallback, stringCallback}, data);
+void Channel::onMessage(std::function<void(binary data)> binaryCallback,
+                        std::function<void(string data)> stringCallback) {
+	onMessage([binaryCallback, stringCallback](std::variant<binary, string> data) {
+		std::visit(overloaded{binaryCallback, stringCallback}, std::move(data));
 	});
 }
 
@@ -59,15 +53,13 @@ void Channel::onBufferedAmountLow(std::function<void()> callback) {
 
 void Channel::setBufferedAmountLowThreshold(size_t amount) { mBufferedAmountLowThreshold = amount; }
 
-void Channel::onAvailable(std::function<void()> callback) {
-	mAvailableCallback = callback;
-}
+void Channel::onAvailable(std::function<void()> callback) { mAvailableCallback = callback; }
 
 void Channel::triggerOpen() { mOpenCallback(); }
 
 void Channel::triggerClosed() { mClosedCallback(); }
 
-void Channel::triggerError(const string &error) { mErrorCallback(error); }
+void Channel::triggerError(string error) { mErrorCallback(error); }
 
 void Channel::triggerAvailable(size_t count) {
 	if (count == 1)
@@ -98,4 +90,3 @@ void Channel::resetCallbacks() {
 }
 
 } // namespace rtc
-

src/datachannel.cpp

@@ -31,6 +31,7 @@ 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
@@ -43,6 +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;
@@ -65,26 +72,18 @@ struct CloseMessage {
 };
 #pragma pack(pop)
 
-const size_t RECV_QUEUE_LIMIT = 1024 * 1024; // 1 MiB
-
-DataChannel::DataChannel(weak_ptr<PeerConnection> pc, unsigned int stream, string label,
+DataChannel::DataChannel(weak_ptr<PeerConnection> pc, uint16_t stream, string label,
                          string protocol, Reliability reliability)
     : mPeerConnection(pc), mStream(stream), mLabel(std::move(label)),
       mProtocol(std::move(protocol)),
       mReliability(std::make_shared<Reliability>(std::move(reliability))),
       mRecvQueue(RECV_QUEUE_LIMIT, message_size_func) {}
 
-DataChannel::DataChannel(weak_ptr<PeerConnection> pc, weak_ptr<SctpTransport> transport,
-                         unsigned int stream)
-    : mPeerConnection(pc), mSctpTransport(transport), mStream(stream),
-      mReliability(std::make_shared<Reliability>()),
-      mRecvQueue(RECV_QUEUE_LIMIT, message_size_func) {}
+DataChannel::~DataChannel() { close(); }
 
-DataChannel::~DataChannel() {
-	close();
-}
+uint16_t DataChannel::stream() const { return mStream; }
 
-unsigned int DataChannel::stream() const { return mStream; }
+uint16_t DataChannel::id() const { return uint16_t(mStream); }
 
 string DataChannel::label() const { return mLabel; }
 
@@ -96,7 +95,7 @@ void DataChannel::close() {
 	mIsClosed = true;
 	if (mIsOpen.exchange(false))
 		if (auto transport = mSctpTransport.lock())
-			transport->close(mStream);
+			transport->closeStream(mStream);
 
 	mSctpTransport.reset();
 	resetCallbacks();
@@ -110,40 +109,37 @@ void DataChannel::remoteClose() {
 	mSctpTransport.reset();
 }
 
-bool DataChannel::send(const std::variant<binary, string> &data) {
-	return std::visit(
-	    [&](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());
-		    return outgoing(std::make_shared<Message>(b, b + d.size(), type));
-	    },
-	    data);
-}
+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<std::variant<binary, string>> DataChannel::receive() {
-	while (!mRecvQueue.empty()) {
-		auto message = *mRecvQueue.pop();
-		switch (message->type) {
-		case Message::Control: {
+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 (raw[0] == MESSAGE_CLOSE)
+		if (!message->empty() && raw[0] == MESSAGE_CLOSE)
 			remoteClose();
-			break;
-		}
-		case Message::String:
-			return std::make_optional(
-			    string(reinterpret_cast<const char *>(message->data()), message->size()));
-		case Message::Binary:
-			return std::make_optional(std::move(*message));
-		default:
-			// Ignore
-			break;
 	}
+
+	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;
@@ -157,7 +153,8 @@ size_t DataChannel::maxMessageSize() const {
 	size_t remoteMax = DEFAULT_MAX_MESSAGE_SIZE;
 	if (auto pc = mPeerConnection.lock())
 		if (auto description = pc->remoteDescription())
-			if (auto maxMessageSize = description->maxMessageSize())
+			if (auto *application = description->application())
+				if (auto maxMessageSize = application->maxMessageSize())
 					remoteMax = *maxMessageSize > 0 ? *maxMessageSize : LOCAL_MAX_MESSAGE_SIZE;
 
 	return std::min(remoteMax, LOCAL_MAX_MESSAGE_SIZE);
@@ -168,32 +165,12 @@ size_t DataChannel::availableAmount() const { return mRecvQueue.amount(); }
 void DataChannel::open(shared_ptr<SctpTransport> transport) {
 	mSctpTransport = transport;
 
-	uint8_t channelType = static_cast<uint8_t>(mReliability->type);
-	if (mReliability->unordered)
-		channelType &= 0x80;
+	if (!mIsOpen.exchange(true))
+		triggerOpen();
+}
 
-	using std::chrono::milliseconds;
-	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();
-	binary buffer(len, byte(0));
-	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));
-	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 DataChannel::processOpenMessage(message_ptr) {
+	PLOG_WARNING << "Received an open message for a user-negotiated DataChannel, ignoring";
 }
 
 bool DataChannel::outgoing(message_ptr message) {
@@ -205,7 +182,7 @@ bool DataChannel::outgoing(message_ptr message) {
 
 	auto transport = mSctpTransport.lock();
 	if (!transport)
-		throw std::runtime_error("DataChannel has no 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;
@@ -219,6 +196,8 @@ void DataChannel::incoming(message_ptr message) {
 
 	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:
@@ -251,7 +230,62 @@ void DataChannel::incoming(message_ptr message) {
 	}
 }
 
-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");
@@ -272,19 +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.reliabilityParameter & 0x80) != 0;
+	mReliability->unordered = (open.channelType & 0x80) != 0;
 	switch (open.channelType & 0x7F) {
-	case Reliability::TYPE_PARTIAL_RELIABLE_REXMIT:
-		mReliability->type = Reliability::TYPE_PARTIAL_RELIABLE_REXMIT;
+	case CHANNEL_PARTIAL_RELIABLE_REXMIT:
+		mReliability->type = Reliability::Type::Rexmit;
 		mReliability->rexmit = int(open.reliabilityParameter);
 		break;
-	case Reliability::TYPE_PARTIAL_RELIABLE_TIMED:
-		mReliability->type = Reliability::TYPE_PARTIAL_RELIABLE_TIMED;
+	case CHANNEL_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);
 	}
 
@@ -294,7 +327,7 @@ void DataChannel::processOpenMessage(message_ptr message) {
 
 	transport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
 
-	mIsOpen = true;
+	if (!mIsOpen.exchange(true))
 		triggerOpen();
 }
 

src/dtlssrtptransport.cpp

@@ -43,101 +43,214 @@ DtlsSrtpTransport::DtlsSrtpTransport(std::shared_ptr<IceTransport> lower,
                     std::move(stateChangeCallback)),
       mSrtpRecvCallback(std::move(srtpRecvCallback)) { // distinct from Transport recv callback
 
-	PLOG_DEBUG << "Initializing SRTP transport";
+	PLOG_DEBUG << "Initializing DTLS-SRTP transport";
 
 #if USE_GNUTLS
-	PLOG_DEBUG << "Initializing DTLS-SRTP transport (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 << "Initializing DTLS-SRTP transport (OpenSSL)";
-	openssl::check(SSL_set_tlsext_use_srtp(mSsl, "SRTP_AES128_CM_SHA1_80"),
-	               "Failed to set SRTP profile");
+	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(); // stop before deallocating
 
-	if (mCreated)
-		srtp_dealloc(mSrtp);
+	srtp_dealloc(mSrtpIn);
+	srtp_dealloc(mSrtpOut);
 }
 
-bool DtlsSrtpTransport::send(message_ptr message) {
+bool DtlsSrtpTransport::sendMedia(message_ptr message) {
 	if (!message)
 		return false;
 
-	int size = message->size();
+	if (!mInitDone) {
+		PLOG_WARNING << "SRTP media sent before keys are derived";
+		return false;
+	}
+
+	int size = int(message->size());
 	PLOG_VERBOSE << "Send size=" << size;
 
-	// srtp_protect() assumes that it can write SRTP_MAX_TRAILER_LEN (for the authentication tag)
-	// into the location in memory immediately following the RTP packet.
+	// 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);
-	if (srtp_err_status_t err = srtp_protect(mSrtp, message->data(), &size)) {
+
+	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("SRTP packet is a replay");
-		else
+				throw std::runtime_error("SRTCP packet is a replay");
+			else if (err == srtp_err_status_no_ctx) {
+				auto ssrc = ((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 = ((RTP *)message->data())->ssrc();
+				PLOG_INFO << "Adding SSRC to RTP: " << 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("SRTP protect error, status=" +
 				                         to_string(static_cast<int>(err)));
 		}
 		PLOG_VERBOSE << "Protected SRTP packet, size=" << size;
+	}
+
 	message->resize(size);
-	outgoing(message);
-	return true;
+	return outgoing(message);
 }
 
 void DtlsSrtpTransport::incoming(message_ptr message) {
-	int size = message->size();
+	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 value = to_integer<uint8_t>(*message->begin());
+	uint8_t value1 = to_integer<uint8_t>(*message->begin());
+	PLOG_VERBOSE << "Demultiplexing DTLS and SRTP/SRTCP with first byte, value="
+	             << unsigned(value1);
 
-	if (value >= 128 && value <= 192) {
+	if (value1 >= 20 && value1 <= 63) {
 		PLOG_VERBOSE << "Incoming DTLS packet, size=" << size;
 		DtlsTransport::incoming(message);
-	} else if (value >= 20 && value <= 64) {
-		PLOG_VERBOSE << "Incoming SRTP packet, size=" << size;
 
-		if (srtp_err_status_t err = srtp_unprotect(mSrtp, message->data(), &size)) {
+	} 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 = ((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;
+			auto rtp = (RTCP_SR *)message->data();
+			message->stream = rtp->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
-				PLOG_WARNING << "SRTP unprotect error, status=" << err;
+				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 = ((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("SRTCP unprotect error, status=" +
+						                         to_string(static_cast<int>(err)));
+				} else
+					PLOG_WARNING << "SRTP unprotect error, status=" << err
+					             << " SSRC=" << ((RTP *)message->data())->ssrc();
 				return;
 			}
 			PLOG_VERBOSE << "Unprotected SRTP packet, size=" << size;
+			message->type = Message::Type::Binary;
+			auto rtp = (RTP *)message->data();
+			message->stream = rtp->ssrc();
+		}
+
 		message->resize(size);
 		mSrtpRecvCallback(message);
 
 	} else {
-		PLOG_WARNING << "Unknown packet type, value=" << value << ", size=" << size;
+		PLOG_WARNING << "Unknown packet type, value=" << unsigned(value1) << ", size=" << size;
 	}
 }
 
 void DtlsSrtpTransport::postHandshake() {
-	if (mCreated)
+	if (mInitDone)
 		return;
 
-	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_any_inbound;
-
-	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_any_outbound;
+	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),
@@ -160,44 +273,77 @@ void DtlsSrtpTransport::postHandshake() {
 	serverKey = reinterpret_cast<const unsigned char *>(serverKeyDatum.data);
 	serverSalt = reinterpret_cast<const unsigned char *>(serverSaltDatum.data);
 #else
-	// This 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.
+	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";
-	openssl::check(SSL_export_keying_material(mSsl, material, materialLen, label.c_str(),
-	                                          label.size(), nullptr, 0, 0),
-	               "Failed to derive SRTP keys");
 
+	// 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;
-	clientSalt = clientKey + SRTP_AES_128_KEY_LEN;
-
-	serverKey = material + SRTP_AES_ICM_128_KEY_LEN_WSALT;
-	serverSalt = serverSalt + SRTP_AES_128_KEY_LEN;
+	serverKey = clientKey + SRTP_AES_128_KEY_LEN;
+	clientSalt = serverKey + SRTP_AES_128_KEY_LEN;
+	serverSalt = clientSalt + SRTP_SALT_LEN;
 #endif
 
-	unsigned char clientSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
-	std::memcpy(clientSessionKey, clientKey, SRTP_AES_128_KEY_LEN);
-	std::memcpy(clientSessionKey + SRTP_AES_128_KEY_LEN, clientSalt, SRTP_SALT_LEN);
+	std::memcpy(mClientSessionKey, clientKey, SRTP_AES_128_KEY_LEN);
+	std::memcpy(mClientSessionKey + SRTP_AES_128_KEY_LEN, clientSalt, SRTP_SALT_LEN);
 
-	unsigned char serverSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
-	std::memcpy(serverSessionKey, serverKey, SRTP_AES_128_KEY_LEN);
-	std::memcpy(serverSessionKey + SRTP_AES_128_KEY_LEN, serverSalt, SRTP_SALT_LEN);
+	std::memcpy(mServerSessionKey, serverKey, SRTP_AES_128_KEY_LEN);
+	std::memcpy(mServerSessionKey + SRTP_AES_128_KEY_LEN, serverSalt, SRTP_SALT_LEN);
 
-	if (mIsClient) {
-		inbound.key = serverSessionKey;
-		outbound.key = clientSessionKey;
-	} else {
-		inbound.key = clientSessionKey;
-		outbound.key = serverSessionKey;
+	// 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)));
 	}
 
-	srtp_policy_t *policies = &inbound;
-	inbound.next = &outbound;
+	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_create(&mSrtp, policies))
-		throw std::runtime_error("SRTP create failed, status=" + to_string(static_cast<int>(err)));
-
-	mCreated = 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

src/dtlssrtptransport.hpp

@@ -24,7 +24,13 @@
 
 #if RTC_ENABLE_MEDIA
 
+#if RTC_SYSTEM_SRTP
 #include <srtp2/srtp.h>
+#else
+#include "srtp.h"
+#endif
+
+#include <atomic>
 
 namespace rtc {
 
@@ -38,7 +44,8 @@ public:
 	                  state_callback stateChangeCallback);
 	~DtlsSrtpTransport();
 
-	bool send(message_ptr message) override;
+	bool sendMedia(message_ptr message);
+	void addSSRC(uint32_t ssrc);
 
 private:
 	void incoming(message_ptr message) override;
@@ -46,8 +53,11 @@ private:
 
 	message_callback mSrtpRecvCallback;
 
-	srtp_t mSrtp;
-	bool mCreated = false;
+	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

src/dtlstransport.cpp

@@ -24,6 +24,14 @@
 #include <exception>
 #include <iostream>
 
+#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;
@@ -36,12 +44,10 @@ namespace rtc {
 #if USE_GNUTLS
 
 void DtlsTransport::Init() {
-	// Nothing to do
+	gnutls_global_init(); // optional
 }
 
-void DtlsTransport::Cleanup() {
-	// Nothing to do
-}
+void DtlsTransport::Cleanup() { gnutls_global_deinit(); }
 
 DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr certificate,
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
@@ -79,9 +85,6 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr cer
 		gnutls_transport_set_pull_function(mSession, ReadCallback);
 		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
 
-		mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
-		registerIncoming();
-
 	} catch (...) {
 		gnutls_deinit(mSession);
 		throw;
@@ -94,6 +97,15 @@ DtlsTransport::~DtlsTransport() {
 	gnutls_deinit(mSession);
 }
 
+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;
@@ -137,7 +149,6 @@ void DtlsTransport::postHandshake() {
 
 void DtlsTransport::runRecvLoop() {
 	const size_t maxMtu = 4096;
-
 	// Handshake loop
 	try {
 		changeState(State::Connecting);
@@ -166,8 +177,8 @@ void DtlsTransport::runRecvLoop() {
 	// Receive loop
 	try {
 		PLOG_INFO << "DTLS handshake finished";
-		changeState(State::Connected);
 		postHandshake();
+		changeState(State::Connected);
 
 		const size_t bufferSize = maxMtu;
 		char buffer[bufferSize];
@@ -247,7 +258,7 @@ 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);
 	if (auto next = t->mIncomingQueue.pop()) {
-		auto message = *next;
+		message_ptr message = std::move(*next);
 		ssize_t len = std::min(maxlen, message->size());
 		std::memcpy(data, message->data(), len);
 		gnutls_transport_set_errno(t->mSession, 0);
@@ -260,9 +271,9 @@ ssize_t DtlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size
 
 int DtlsTransport::TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms) {
 	DtlsTransport *t = static_cast<DtlsTransport *>(ptr);
-	t->mIncomingQueue.wait(ms != GNUTLS_INDEFINITE_TIMEOUT ? std::make_optional(milliseconds(ms))
-	                                                       : nullopt);
-	return !t->mIncomingQueue.empty() ? 1 : 0;
+	bool notEmpty = t->mIncomingQueue.wait(
+	    ms != GNUTLS_INDEFINITE_TIMEOUT ? std::make_optional(milliseconds(ms)) : nullopt);
+	return notEmpty ? 1 : 0;
 }
 
 #else // USE_GNUTLS==0
@@ -302,7 +313,8 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
 	PLOG_DEBUG << "Initializing DTLS transport (OpenSSL)";
 
 	try {
-		if (!(mCtx = SSL_CTX_new(DTLS_method())))
+		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"),
@@ -326,7 +338,8 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
 
 		openssl::check(SSL_CTX_check_private_key(mCtx), "SSL local private key check failed");
 
-		if (!(mSsl = SSL_new(mCtx)))
+		mSsl = SSL_new(mCtx);
+		if (!mSsl)
 			throw std::runtime_error("Failed to create SSL instance");
 
 		SSL_set_ex_data(mSsl, TransportExIndex, this);
@@ -336,7 +349,9 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
 		else
 			SSL_set_accept_state(mSsl);
 
-		if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BioMethods)))
+		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);
@@ -348,9 +363,6 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
 		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
 		SSL_set_tmp_ecdh(mSsl, ecdh.get());
 
-		mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
-		registerIncoming();
-
 	} catch (...) {
 		if (mSsl)
 			SSL_free(mSsl);
@@ -367,6 +379,15 @@ DtlsTransport::~DtlsTransport() {
 	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;
@@ -384,7 +405,7 @@ bool DtlsTransport::send(message_ptr message) {
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
-	int ret = SSL_write(mSsl, message->data(), message->size());
+	int ret = SSL_write(mSsl, message->data(), int(message->size()));
 	return openssl::check(mSsl, ret);
 }
 
@@ -414,15 +435,15 @@ void DtlsTransport::runRecvLoop() {
 
 		const size_t bufferSize = maxMtu;
 		byte buffer[bufferSize];
-		while (true) {
+		while (mIncomingQueue.running()) {
 			// Process pending messages
-			while (!mIncomingQueue.empty()) {
-				auto message = *mIncomingQueue.pop();
-				BIO_write(mInBio, message->data(), message->size());
+			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
-					int ret = SSL_do_handshake(mSsl);
+					ret = SSL_do_handshake(mSsl);
 					if (!openssl::check(mSsl, ret, "Handshake failed"))
 						break;
 
@@ -432,11 +453,11 @@ void DtlsTransport::runRecvLoop() {
 						SSL_set_mtu(mSsl, maxMtu + 1);
 
 						PLOG_INFO << "DTLS handshake finished";
-						changeState(State::Connected);
 						postHandshake();
+						changeState(State::Connected);
 					}
 				} else {
-					int ret = SSL_read(mSsl, buffer, bufferSize);
+					ret = SSL_read(mSsl, buffer, bufferSize);
 					if (!openssl::check(mSsl, ret))
 						break;
 
@@ -449,7 +470,7 @@ void DtlsTransport::runRecvLoop() {
 			std::optional<milliseconds> duration;
 			if (state() == State::Connecting) {
 				// Warning: This function breaks the usual return value convention
-				int ret = DTLSv1_handle_timeout(mSsl);
+				ret = DTLSv1_handle_timeout(mSsl);
 				if (ret < 0) {
 					throw std::runtime_error("Handshake timeout"); // write BIO can't fail
 				} else if (ret > 0) {
@@ -471,8 +492,7 @@ void DtlsTransport::runRecvLoop() {
 				}
 			}
 
-			if (!mIncomingQueue.wait(duration))
-				break; // queue is stopped
+			mIncomingQueue.wait(duration);
 		}
 	} catch (const std::exception &e) {
 		PLOG_ERROR << "DTLS recv: " << e.what();
@@ -488,7 +508,7 @@ void DtlsTransport::runRecvLoop() {
 	}
 }
 
-int DtlsTransport::CertificateCallback(int preverify_ok, X509_STORE_CTX *ctx) {
+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 =
@@ -537,7 +557,7 @@ int DtlsTransport::BioMethodWrite(BIO *bio, const char *in, int inl) {
 	return inl; // can't fail
 }
 
-long DtlsTransport::BioMethodCtrl(BIO *bio, int cmd, long num, void *ptr) {
+long DtlsTransport::BioMethodCtrl(BIO * /*bio*/, int cmd, long /*num*/, void * /*ptr*/) {
 	switch (cmd) {
 	case BIO_CTRL_FLUSH:
 		return 1;
@@ -555,4 +575,3 @@ long DtlsTransport::BioMethodCtrl(BIO *bio, int cmd, long num, void *ptr) {
 #endif
 
 } // namespace rtc
-

src/dtlstransport.hpp

@@ -47,6 +47,7 @@ public:
 	              verifier_callback verifierCallback, state_callback stateChangeCallback);
 	~DtlsTransport();
 
+	virtual void start() override;
 	virtual bool stop() override;
 	virtual bool send(message_ptr message) override; // false if dropped
 
@@ -91,4 +92,3 @@ protected:
 } // namespace rtc
 
 #endif
-

src/icetransport.cpp

@@ -40,16 +40,18 @@ using namespace std::chrono_literals;
 
 using std::shared_ptr;
 using std::weak_ptr;
+using std::chrono::system_clock;
 
-#if USE_JUICE
+#if !USE_NICE
 
 namespace rtc {
 
-IceTransport::IceTransport(const Configuration &config, Description::Role role,
-                           candidate_callback candidateCallback, state_callback stateChangeCallback,
+IceTransport::IceTransport(const Configuration &config, candidate_callback candidateCallback,
+                           state_callback stateChangeCallback,
                            gathering_state_callback gatheringStateChangeCallback)
-    : Transport(nullptr, std::move(stateChangeCallback)), mRole(role), mMid("0"),
-      mGatheringState(GatheringState::New), mCandidateCallback(std::move(candidateCallback)),
+    : 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) {
 
@@ -57,8 +59,32 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 	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(JUICE_LOG_LEVEL_VERBOSE);
+	juice_set_log_level(level);
 
 	juice_config_t jconfig = {};
 	jconfig.cb_state_changed = IceTransport::StateChangeCallback;
@@ -69,7 +95,7 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 
 	// Randomize servers 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));
 
 	// Pick a STUN server (TURN support is not implemented in libjuice yet)
@@ -82,7 +108,7 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 			mStunHostname = server.hostname;
 			mStunService = server.service;
 			jconfig.stun_server_host = mStunHostname.c_str();
-			jconfig.stun_server_port = std::stoul(mStunService);
+			jconfig.stun_server_port = uint16_t(std::stoul(mStunService));
 			break;
 		}
 	}
@@ -105,9 +131,7 @@ IceTransport::~IceTransport() {
 	mAgent.reset();
 }
 
-bool IceTransport::stop() {
-	return Transport::stop();
-}
+bool IceTransport::stop() { return Transport::stop(); }
 
 Description::Role IceTransport::role() const { return mRole; }
 
@@ -116,15 +140,24 @@ Description IceTransport::getLocalDescription(Description::Type type) const {
 	if (juice_get_local_description(mAgent.get(), sdp, JUICE_MAX_SDP_STRING_LEN) < 0)
 		throw std::runtime_error("Failed to generate local SDP");
 
-	return Description(string(sdp), 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), 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;
-	mMid = description.dataMid();
-	if (juice_set_remote_description(mAgent.get(), string(description).c_str()) < 0)
-		throw std::runtime_error("Failed to parse remote SDP");
+	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) {
@@ -161,6 +194,24 @@ std::optional<string> IceTransport::getRemoteAddress() const {
 	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))
@@ -206,7 +257,7 @@ void IceTransport::processCandidate(const string &candidate) {
 
 void IceTransport::processGatheringDone() { changeGatheringState(GatheringState::Complete); }
 
-void IceTransport::StateChangeCallback(juice_agent_t *agent, juice_state_t state, void *user_ptr) {
+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));
@@ -215,7 +266,7 @@ void IceTransport::StateChangeCallback(juice_agent_t *agent, juice_state_t state
 	}
 }
 
-void IceTransport::CandidateCallback(juice_agent_t *agent, const char *sdp, void *user_ptr) {
+void IceTransport::CandidateCallback(juice_agent_t *, const char *sdp, void *user_ptr) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
 	try {
 		iceTransport->processCandidate(sdp);
@@ -224,7 +275,7 @@ void IceTransport::CandidateCallback(juice_agent_t *agent, const char *sdp, void
 	}
 }
 
-void IceTransport::GatheringDoneCallback(juice_agent_t *agent, void *user_ptr) {
+void IceTransport::GatheringDoneCallback(juice_agent_t *, void *user_ptr) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
 	try {
 		iceTransport->processGatheringDone();
@@ -233,8 +284,7 @@ void IceTransport::GatheringDoneCallback(juice_agent_t *agent, void *user_ptr) {
 	}
 }
 
-void IceTransport::RecvCallback(juice_agent_t *agent, const char *data, size_t size,
-                                void *user_ptr) {
+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;
@@ -269,15 +319,16 @@ void IceTransport::LogCallback(juice_log_level_t level, const char *message) {
 
 } // namespace rtc
 
-#else // USE_JUICE == 0
+#else // USE_NICE == 1
 
 namespace rtc {
 
-IceTransport::IceTransport(const Configuration &config, Description::Role role,
-                           candidate_callback candidateCallback, state_callback stateChangeCallback,
+IceTransport::IceTransport(const Configuration &config, candidate_callback candidateCallback,
+                           state_callback stateChangeCallback,
                            gathering_state_callback gatheringStateChangeCallback)
-    : Transport(nullptr, std::move(stateChangeCallback)), mRole(role), mMid("0"),
-      mGatheringState(GatheringState::New), mCandidateCallback(std::move(candidateCallback)),
+    : 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) {
 
@@ -337,7 +388,7 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 
 	// 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
@@ -356,8 +407,11 @@ 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) {
@@ -399,8 +453,11 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 		    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)
+		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) {
@@ -477,18 +534,28 @@ Description IceTransport::getLocalDescription(Description::Type type) const {
 
 	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) {
+	if (mRole == Description::Role::ActPass)
 		mRole = description.role() == Description::Role::Active ? Description::Role::Passive
 		                                                        : Description::Role::Active;
-	mMid = description.dataMid();
+	if (mRole == description.role())
+		throw std::logic_error("Incompatible roles with remote description");
+
+	mMid = description.bundleMid();
 	mTrickleTimeout = !description.ended() ? 30s : 0s;
 
 	// Warning: libnice expects "\n" as end of line
-	if (nice_agent_parse_remote_sdp(mNiceAgent.get(), description.generateSdp("\n").c_str()) < 0)
-		throw std::runtime_error("Failed to parse remote SDP");
+	if (nice_agent_parse_remote_sdp(mNiceAgent.get(),
+	                                description.generateApplicationSdp("\n").c_str()) < 0)
+		throw std::runtime_error("Failed to parse ICE settings from remote SDP");
 }
 
 bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
@@ -497,12 +564,14 @@ bool IceTransport::addRemoteCandidate(const Candidate &candidate) {
 		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);
@@ -622,7 +691,8 @@ void IceTransport::CandidateCallback(NiceAgent *agent, NiceCandidate *candidate,
 	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);
 	try {
 		iceTransport->processGatheringDone();
@@ -631,8 +701,8 @@ void IceTransport::GatheringDoneCallback(NiceAgent *agent, guint streamId, gpoin
 	}
 }
 
-void IceTransport::StateChangeCallback(NiceAgent *agent, guint streamId, guint componentId,
-                                       guint state, gpointer userData) {
+void IceTransport::StateChangeCallback(NiceAgent * /*agent*/, guint /*streamId*/,
+                                       guint /*componentId*/, guint state, gpointer userData) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(userData);
 	try {
 		iceTransport->processStateChange(state);
@@ -641,8 +711,8 @@ void IceTransport::StateChangeCallback(NiceAgent *agent, guint streamId, guint c
 	}
 }
 
-void IceTransport::RecvCallback(NiceAgent *agent, guint streamId, guint componentId, guint len,
-                                gchar *buf, gpointer userData) {
+void IceTransport::RecvCallback(NiceAgent * /*agent*/, guint /*streamId*/, guint /*componentId*/,
+                                guint len, gchar *buf, gpointer userData) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(userData);
 	try {
 		PLOG_VERBOSE << "Incoming size=" << len;
@@ -663,8 +733,8 @@ gboolean IceTransport::TimeoutCallback(gpointer userData) {
 	return FALSE;
 }
 
-void IceTransport::LogCallback(const gchar *logDomain, GLogLevelFlags logLevel,
-                               const gchar *message, gpointer userData) {
+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)
@@ -683,58 +753,28 @@ void IceTransport::LogCallback(const gchar *logDomain, GLogLevelFlags logLevel,
 	PLOG(severity) << "nice: " << message;
 }
 
-bool IceTransport::getSelectedCandidatePair(CandidateInfo *localInfo, CandidateInfo *remoteInfo) {
-	NiceCandidate *local, *remote;
-	gboolean result = nice_agent_get_selected_pair(mNiceAgent.get(), mStreamId, 1, &local, &remote);
-
-	if (!result)
+bool IceTransport::getSelectedCandidatePair(Candidate *local, Candidate *remote) {
+	NiceCandidate *niceLocal, *niceRemote;
+	if (!nice_agent_get_selected_pair(mNiceAgent.get(), mStreamId, 1, &niceLocal, &niceRemote))
 		return false;
 
-	char ipaddr[INET6_ADDRSTRLEN];
-	nice_address_to_string(&local->addr, ipaddr);
-	localInfo->address = std::string(ipaddr);
-	localInfo->port = nice_address_get_port(&local->addr);
-	localInfo->type = IceTransport::NiceTypeToCandidateType(local->type);
-	localInfo->transportType =
-	    IceTransport::NiceTransportTypeToCandidateTransportType(local->transport);
+	gchar *sdpLocal = nice_agent_generate_local_candidate_sdp(mNiceAgent.get(), niceLocal);
+	if (local)
+		*local = Candidate(sdpLocal, mMid);
+	g_free(sdpLocal);
 
-	nice_address_to_string(&remote->addr, ipaddr);
-	remoteInfo->address = std::string(ipaddr);
-	remoteInfo->port = nice_address_get_port(&remote->addr);
-	remoteInfo->type = IceTransport::NiceTypeToCandidateType(remote->type);
-	remoteInfo->transportType =
-	    IceTransport::NiceTransportTypeToCandidateTransportType(remote->transport);
+	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;
 }
 
-const CandidateType IceTransport::NiceTypeToCandidateType(NiceCandidateType type) {
-	switch (type) {
-	case NiceCandidateType::NICE_CANDIDATE_TYPE_PEER_REFLEXIVE:
-		return CandidateType::PeerReflexive;
-	case NiceCandidateType::NICE_CANDIDATE_TYPE_RELAYED:
-		return CandidateType::Relayed;
-	case NiceCandidateType::NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE:
-		return CandidateType::ServerReflexive;
-	default:
-		return CandidateType::Host;
-	}
-}
-
-const CandidateTransportType
-IceTransport::NiceTransportTypeToCandidateTransportType(NiceCandidateTransport type) {
-	switch (type) {
-	case NiceCandidateTransport::NICE_CANDIDATE_TRANSPORT_TCP_ACTIVE:
-		return CandidateTransportType::TcpActive;
-	case NiceCandidateTransport::NICE_CANDIDATE_TRANSPORT_TCP_PASSIVE:
-		return CandidateTransportType::TcpPassive;
-	case NiceCandidateTransport::NICE_CANDIDATE_TRANSPORT_TCP_SO:
-		return CandidateTransportType::TcpSo;
-	default:
-		return CandidateTransportType::Udp;
-	}
-}
-
 } // namespace rtc
 
 #endif

src/icetransport.hpp

@@ -20,13 +20,13 @@
 #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"
 
-#if USE_JUICE
+#if !USE_NICE
 #include <juice/juice.h>
 #else
 #include <nice/agent.h>
@@ -45,8 +45,8 @@ public:
 	using candidate_callback = std::function<void(const Candidate &candidate)>;
 	using gathering_state_callback = std::function<void(GatheringState state)>;
 
-	IceTransport(const Configuration &config, Description::Role role,
-	             candidate_callback candidateCallback, state_callback stateChangeCallback,
+	IceTransport(const Configuration &config, candidate_callback candidateCallback,
+	             state_callback stateChangeCallback,
 	             gathering_state_callback gatheringStateChangeCallback);
 	~IceTransport();
 
@@ -63,9 +63,7 @@ public:
 	bool stop() override;
 	bool send(message_ptr message) override; // false if dropped
 
-#if !USE_JUICE
-	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
-#endif
+	bool getSelectedCandidatePair(Candidate *local, Candidate *remote);
 
 private:
 	bool outgoing(message_ptr message) override;
@@ -85,7 +83,7 @@ private:
 	candidate_callback mCandidateCallback;
 	gathering_state_callback mGatheringStateChangeCallback;
 
-#if USE_JUICE
+#if !USE_NICE
 	std::unique_ptr<juice_agent_t, void (*)(juice_agent_t *)> mAgent;
 	string mStunHostname;
 	string mStunService;
@@ -113,8 +111,6 @@ private:
 	static gboolean TimeoutCallback(gpointer userData);
 	static void LogCallback(const gchar *log_domain, GLogLevelFlags log_level, const gchar *message,
 	                        gpointer user_data);
-	static const CandidateType NiceTypeToCandidateType(NiceCandidateType type);
-	static const CandidateTransportType NiceTransportTypeToCandidateTransportType(NiceCandidateTransport type);
 #endif
 };
 

src/init.cpp

@@ -21,6 +21,7 @@
 #include "certificate.hpp"
 #include "dtlstransport.hpp"
 #include "sctptransport.hpp"
+#include "threadpool.hpp"
 #include "tls.hpp"
 
 #if RTC_ENABLE_WEBSOCKET
@@ -39,31 +40,19 @@ using std::shared_ptr;
 
 namespace rtc {
 
-std::weak_ptr<Init> Init::Weak;
-init_token Init::Global;
-std::mutex Init::Mutex;
+namespace {
 
-init_token Init::Token() {
-	std::lock_guard lock(Mutex);
+void doInit() {
+	PLOG_DEBUG << "Global initialization";
 
-	if (!Global) {
-		if (auto token = Weak.lock())
-			Global = token;
-		else
-			Global = shared_ptr<Init>(new Init());
-	}
-	return Global;
-}
-
-void Init::Cleanup() { Global.reset(); }
-
-Init::Init() {
 #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
@@ -80,8 +69,12 @@ Init::Init() {
 #endif
 }
 
-Init::~Init() {
+void doCleanup() {
+	PLOG_DEBUG << "Global cleanup";
+
+	ThreadPool::Instance().join();
 	CleanupCertificateCache();
+
 	SctpTransport::Cleanup();
 	DtlsTransport::Cleanup();
 #if RTC_ENABLE_WEBSOCKET
@@ -96,5 +89,56 @@ Init::~Init() {
 #endif
 }
 
-} // namespace rtc
+} // 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

@@ -19,9 +19,13 @@
 #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)); }
@@ -29,6 +33,8 @@ 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";
@@ -38,5 +44,4 @@ void InitLogger(plog::Severity severity, plog::IAppender *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/rtc.cpp

@@ -1,521 +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 "include.hpp"
-
-#include "datachannel.hpp"
-#include "peerconnection.hpp"
-
-#if RTC_ENABLE_WEBSOCKET
-#include "websocket.hpp"
-#endif
-
-#include <rtc.h>
-
-#include <exception>
-#include <mutex>
-#include <unordered_map>
-#include <utility>
-
-using namespace rtc;
-using std::shared_ptr;
-using std::string;
-
-#define CATCH(statement)                                                                           \
-	try {                                                                                          \
-		statement;                                                                                 \
-	} catch (const std::exception &e) {                                                            \
-		PLOG_ERROR << e.what();                                                                    \
-		return -1;                                                                                 \
-	}
-
-namespace {
-
-std::unordered_map<int, shared_ptr<PeerConnection>> peerConnectionMap;
-std::unordered_map<int, shared_ptr<DataChannel>> dataChannelMap;
-#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;
-
-void *getUserPointer(int id) {
-	std::lock_guard lock(mutex);
-	auto it = userPointerMap.find(id);
-	return it != userPointerMap.end() ? it->second : nullptr;
-}
-
-void setUserPointer(int i, void *ptr) {
-	std::lock_guard lock(mutex);
-	if (ptr)
-		userPointerMap.insert(std::make_pair(i, ptr));
-	else
-		userPointerMap.erase(i);
-}
-
-shared_ptr<PeerConnection> getPeerConnection(int id) {
-	std::lock_guard lock(mutex);
-	auto it = peerConnectionMap.find(id);
-	return it != peerConnectionMap.end() ? it->second : nullptr;
-}
-
-shared_ptr<DataChannel> getDataChannel(int id) {
-	std::lock_guard lock(mutex);
-	auto it = dataChannelMap.find(id);
-	return it != dataChannelMap.end() ? it->second : nullptr;
-}
-
-int emplacePeerConnection(shared_ptr<PeerConnection> ptr) {
-	std::lock_guard lock(mutex);
-	int pc = ++lastId;
-	peerConnectionMap.emplace(std::make_pair(pc, ptr));
-	return pc;
-}
-
-int emplaceDataChannel(shared_ptr<DataChannel> ptr) {
-	std::lock_guard lock(mutex);
-	int dc = ++lastId;
-	dataChannelMap.emplace(std::make_pair(dc, ptr));
-	return dc;
-}
-
-bool erasePeerConnection(int pc) {
-	std::lock_guard lock(mutex);
-	if (peerConnectionMap.erase(pc) == 0)
-		return false;
-	userPointerMap.erase(pc);
-	return true;
-}
-
-bool eraseDataChannel(int dc) {
-	std::lock_guard lock(mutex);
-	if (dataChannelMap.erase(dc) == 0)
-		return false;
-	userPointerMap.erase(dc);
-	return true;
-}
-
-#if RTC_ENABLE_WEBSOCKET
-shared_ptr<WebSocket> getWebSocket(int id) {
-	std::lock_guard lock(mutex);
-	auto it = webSocketMap.find(id);
-	return it != webSocketMap.end() ? it->second : nullptr;
-}
-
-int emplaceWebSocket(shared_ptr<WebSocket> ptr) {
-	std::lock_guard lock(mutex);
-	int ws = ++lastId;
-	webSocketMap.emplace(std::make_pair(ws, ptr));
-	return ws;
-}
-
-bool eraseWebSocket(int ws) {
-	std::lock_guard lock(mutex);
-	if (webSocketMap.erase(ws) == 0)
-		return false;
-	userPointerMap.erase(ws);
-	return true;
-}
-#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 RTC_ENABLE_WEBSOCKET
-	if (auto it = webSocketMap.find(id); it != webSocketMap.end())
-		return it->second;
-#endif
-	return nullptr;
-}
-
-} // namespace
-
-void rtcInitLogger(rtcLogLevel level) { InitLogger(static_cast<LogLevel>(level)); }
-
-void rtcSetUserPointer(int i, void *ptr) { setUserPointer(i, ptr); }
-
-int rtcCreatePeerConnection(const rtcConfiguration *config) {
-	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) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	peerConnection->onDataChannel(nullptr);
-	peerConnection->onLocalDescription(nullptr);
-	peerConnection->onLocalCandidate(nullptr);
-	peerConnection->onStateChange(nullptr);
-	peerConnection->onGatheringStateChange(nullptr);
-
-	erasePeerConnection(pc);
-	return 0;
-}
-
-int rtcCreateDataChannel(int pc, const char *label) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	int dc = emplaceDataChannel(peerConnection->createDataChannel(string(label)));
-	void *ptr = getUserPointer(pc);
-	rtcSetUserPointer(dc, ptr);
-	return dc;
-}
-
-int rtcDeleteDataChannel(int dc) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
-		return -1;
-
-	dataChannel->onOpen(nullptr);
-	dataChannel->onClosed(nullptr);
-	dataChannel->onError(nullptr);
-	dataChannel->onMessage(nullptr);
-	dataChannel->onBufferedAmountLow(nullptr);
-	dataChannel->onAvailable(nullptr);
-
-	eraseDataChannel(dc);
-	return 0;
-}
-
-#if RTC_ENABLE_WEBSOCKET
-int rtcCreateWebSocket(const char *url) {
-	auto ws = std::make_shared<WebSocket>();
-	ws->open(url);
-	return emplaceWebSocket(ws);
-}
-
-int rtcDeleteWebsocket(int ws) {
-	auto webSocket = getWebSocket(ws);
-	if (!webSocket)
-		return -1;
-
-	webSocket->onOpen(nullptr);
-	webSocket->onClosed(nullptr);
-	webSocket->onError(nullptr);
-	webSocket->onMessage(nullptr);
-	webSocket->onBufferedAmountLow(nullptr);
-	webSocket->onAvailable(nullptr);
-
-	eraseWebSocket(ws);
-	return 0;
-}
-
-#endif
-
-int rtcSetDataChannelCallback(int pc, dataChannelCallbackFunc cb) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	if (cb)
-		peerConnection->onDataChannel([pc, cb](std::shared_ptr<DataChannel> dataChannel) {
-			int dc = emplaceDataChannel(dataChannel);
-			void *ptr = getUserPointer(pc);
-			rtcSetUserPointer(dc, ptr);
-			cb(dc, ptr);
-		});
-	else
-		peerConnection->onDataChannel(nullptr);
-	return 0;
-}
-
-int rtcSetLocalDescriptionCallback(int pc, descriptionCallbackFunc cb) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	if (cb)
-		peerConnection->onLocalDescription([pc, cb](const Description &desc) {
-			cb(string(desc).c_str(), desc.typeString().c_str(), getUserPointer(pc));
-		});
-	else
-		peerConnection->onLocalDescription(nullptr);
-	return 0;
-}
-
-int rtcSetLocalCandidateCallback(int pc, candidateCallbackFunc cb) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	if (cb)
-		peerConnection->onLocalCandidate([pc, cb](const Candidate &cand) {
-			cb(cand.candidate().c_str(), cand.mid().c_str(), getUserPointer(pc));
-		});
-	else
-		peerConnection->onLocalCandidate(nullptr);
-	return 0;
-}
-
-int rtcSetStateChangeCallback(int pc, stateChangeCallbackFunc cb) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	if (cb)
-		peerConnection->onStateChange([pc, cb](PeerConnection::State state) {
-			cb(static_cast<rtcState>(state), getUserPointer(pc));
-		});
-	else
-		peerConnection->onStateChange(nullptr);
-	return 0;
-}
-
-int rtcSetGatheringStateChangeCallback(int pc, gatheringStateCallbackFunc cb) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	if (cb)
-		peerConnection->onGatheringStateChange([pc, cb](PeerConnection::GatheringState state) {
-			cb(static_cast<rtcGatheringState>(state), getUserPointer(pc));
-		});
-	else
-		peerConnection->onGatheringStateChange(nullptr);
-	return 0;
-}
-
-int rtcSetRemoteDescription(int pc, const char *sdp, const char *type) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	CATCH(peerConnection->setRemoteDescription({string(sdp), type ? string(type) : ""}));
-	return 0;
-}
-
-int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	CATCH(peerConnection->addRemoteCandidate({string(cand), mid ? string(mid) : ""}))
-	return 0;
-}
-
-int rtcGetLocalAddress(int pc, char *buffer, int size) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	if (auto addr = peerConnection->localAddress()) {
-		size = std::min(size_t(size - 1), addr->size());
-		std::copy(addr->data(), addr->data() + size, buffer);
-		buffer[size] = '\0';
-		return size + 1;
-	}
-	return -1;
-}
-
-int rtcGetRemoteAddress(int pc, char *buffer, int size) {
-	auto peerConnection = getPeerConnection(pc);
-	if (!peerConnection)
-		return -1;
-
-	if (auto addr = peerConnection->remoteAddress()) {
-		size = std::min(size_t(size - 1), addr->size());
-		std::copy(addr->data(), addr->data() + size, buffer);
-		buffer[size] = '\0';
-		return size + 1;
-	}
-	return -1;
-}
-
-int rtcGetDataChannelLabel(int dc, char *buffer, int size) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
-		return -1;
-
-	if (!size)
-		return 0;
-
-	string label = dataChannel->label();
-	size = std::min(size_t(size - 1), label.size());
-	std::copy(label.data(), label.data() + size, buffer);
-	buffer[size] = '\0';
-	return size + 1;
-}
-
-int rtcSetOpenCallback(int id, openCallbackFunc cb) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (cb)
-		channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
-	else
-		channel->onOpen(nullptr);
-	return 0;
-}
-
-int rtcSetClosedCallback(int id, closedCallbackFunc cb) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (cb)
-		channel->onClosed([id, cb]() { cb(getUserPointer(id)); });
-	else
-		channel->onClosed(nullptr);
-	return 0;
-}
-
-int rtcSetErrorCallback(int id, errorCallbackFunc cb) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (cb)
-		channel->onError([id, cb](const string &error) { cb(error.c_str(), getUserPointer(id)); });
-	else
-		channel->onError(nullptr);
-	return 0;
-}
-
-int rtcSetMessageCallback(int id, messageCallbackFunc cb) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (cb)
-		channel->onMessage(
-		    [id, cb](const binary &b) {
-			    cb(reinterpret_cast<const char *>(b.data()), b.size(), getUserPointer(id));
-		    },
-		    [id, cb](const string &s) { cb(s.c_str(), -1, getUserPointer(id)); });
-	else
-		channel->onMessage(nullptr);
-
-	return 0;
-}
-
-int rtcSendMessage(int id, const char *data, int size) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (size >= 0) {
-		auto b = reinterpret_cast<const byte *>(data);
-		CATCH(channel->send(binary(b, b + size)));
-		return size;
-	} else {
-		string str(data);
-		int len = str.size();
-		CATCH(channel->send(std::move(str)));
-		return len;
-	}
-}
-
-int rtcGetBufferedAmount(int id) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	CATCH(return int(channel->bufferedAmount()));
-}
-
-int rtcSetBufferedAmountLowThreshold(int id, int amount) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	CATCH(channel->setBufferedAmountLowThreshold(size_t(amount)));
-	return 0;
-}
-
-int rtcSetBufferedAmountLowCallback(int id, bufferedAmountLowCallbackFunc cb) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (cb)
-		channel->onBufferedAmountLow([id, cb]() { cb(getUserPointer(id)); });
-	else
-		channel->onBufferedAmountLow(nullptr);
-	return 0;
-}
-
-int rtcGetAvailableAmount(int id) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	CATCH(return int(channel->availableAmount()));
-}
-
-int rtcSetAvailableCallback(int id, availableCallbackFunc cb) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (cb)
-		channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
-	else
-		channel->onOpen(nullptr);
-	return 0;
-}
-
-int rtcReceiveMessage(int id, char *buffer, int *size) {
-	auto channel = getChannel(id);
-	if (!channel)
-		return -1;
-
-	if (!size)
-		return -1;
-
-	CATCH({
-		auto message = channel->receive();
-		if (!message)
-			return 0;
-
-		return std::visit( //
-		    overloaded{    //
-		               [&](const binary &b) {
-			               *size = std::min(*size, int(b.size()));
-			               auto data = reinterpret_cast<const char *>(b.data());
-			               std::copy(data, data + *size, buffer);
-			               return *size;
-		               },
-		               [&](const string &s) {
-			               int len = std::min(*size - 1, int(s.size()));
-			               if (len >= 0) {
-				               std::copy(s.data(), s.data() + len, buffer);
-				               buffer[len] = '\0';
-			               }
-			               *size = -(len + 1);
-			               return len + 1;
-		               }},
-		    *message);
-	});
-}
-
-void rtcCleanup() { rtc::Cleanup(); }

src/rtcp.cpp

@@ -0,0 +1,137 @@
+/**
+ * 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
+ */
+
+#include "rtcp.hpp"
+
+#include "track.hpp"
+#include <cmath>
+#include <utility>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+namespace rtc {
+
+rtc::message_ptr RtcpReceivingSession::outgoing(rtc::message_ptr ptr) { return ptr; }
+
+rtc::message_ptr RtcpReceivingSession::incoming(rtc::message_ptr ptr) {
+	if (ptr->type == rtc::Message::Type::Binary) {
+		auto rtp = reinterpret_cast<const RTP *>(ptr->data());
+
+		// https://tools.ietf.org/html/rfc3550#appendix-A.1
+		if (rtp->version() != 2) {
+			PLOG_WARNING << "RTP packet is not version 2";
+
+			return nullptr;
+		}
+		if (rtp->payloadType() == 201 || rtp->payloadType() == 200) {
+			PLOG_WARNING << "RTP packet has a payload type indicating RR/SR";
+
+			return nullptr;
+		}
+
+		// TODO Implement the padding bit
+		if (rtp->padding()) {
+			PLOG_WARNING << "Padding processing not implemented";
+		}
+
+		mSsrc = rtp->ssrc();
+
+		return ptr;
+	}
+
+	assert(ptr->type == rtc::Message::Type::Control);
+	auto rr = reinterpret_cast<const RTCP_RR *>(ptr->data());
+	if (rr->header.payloadType() == 201) {
+		// RR
+		mSsrc = rr->senderSSRC();
+		rr->log();
+	} else if (rr->header.payloadType() == 200) {
+		// SR
+		mSsrc = rr->senderSSRC();
+		auto sr = reinterpret_cast<const RTCP_SR *>(ptr->data());
+		mSyncRTPTS = sr->rtpTimestamp();
+		mSyncNTPTS = sr->ntpTimestamp();
+		sr->log();
+
+		// TODO For the time being, we will send RR's/REMB's when we get an SR
+		pushRR(0);
+		if (mRequestedBitrate > 0)
+			pushREMB(mRequestedBitrate);
+	}
+	return nullptr;
+}
+
+void RtcpReceivingSession::requestBitrate(unsigned int newBitrate) {
+	mRequestedBitrate = newBitrate;
+
+	PLOG_DEBUG << "[GOOG-REMB] Requesting bitrate: " << newBitrate << std::endl;
+	pushREMB(newBitrate);
+}
+
+void RtcpReceivingSession::pushREMB(unsigned int bitrate) {
+	rtc::message_ptr msg =
+	    rtc::make_message(RTCP_REMB::sizeWithSSRCs(1), rtc::Message::Type::Control);
+	auto remb = reinterpret_cast<RTCP_REMB *>(msg->data());
+	remb->preparePacket(mSsrc, 1, bitrate);
+	remb->setSsrc(0, mSsrc);
+
+	send(msg);
+}
+
+void RtcpReceivingSession::pushRR(unsigned int lastSR_delay) {
+	auto msg = rtc::make_message(RTCP_RR::sizeWithReportBlocks(1), rtc::Message::Type::Control);
+	auto rr = reinterpret_cast<RTCP_RR *>(msg->data());
+	rr->preparePacket(mSsrc, 1);
+	rr->getReportBlock(0)->preparePacket(mSsrc, 0, 0, uint16_t(mGreatestSeqNo), 0, 0, mSyncNTPTS,
+	                                     lastSR_delay);
+	rr->log();
+
+	send(msg);
+}
+
+bool RtcpReceivingSession::send(message_ptr msg) {
+	try {
+		outgoingCallback(std::move(msg));
+		return true;
+	} catch (const std::exception &e) {
+		LOG_DEBUG << "RTCP tx failed: " << e.what();
+	}
+	return false;
+}
+
+bool RtcpReceivingSession::requestKeyframe() {
+	pushPLI();
+	return true; // TODO Make this false when it is impossible (i.e. Opus).
+}
+
+void RtcpReceivingSession::pushPLI() {
+	auto msg = rtc::make_message(rtc::RTCP_PLI::size(), rtc::Message::Type::Control);
+	auto *pli = (rtc::RTCP_PLI *)msg->data();
+	pli->preparePacket(mSsrc);
+	send(msg);
+}
+
+void RtcpHandler::onOutgoing(const std::function<void(rtc::message_ptr)> &cb) {
+	this->outgoingCallback = synchronized_callback<rtc::message_ptr>(cb);
+}
+} // namespace rtc

src/sctptransport.cpp

@@ -24,7 +24,7 @@
 #include <thread>
 #include <vector>
 
-#ifdef USE_JUICE
+#if !USE_NICE
 #ifndef __APPLE__
 // libjuice enables Linux path MTU discovery or sets the DF flag
 #define USE_PMTUD 1
@@ -32,7 +32,7 @@
 // Setting the DF flag is not available on Mac OS
 #define USE_PMTUD 0
 #endif
-#else
+#else // USE_NICE == 1
 #ifdef __linux__
 // Linux UDP does path MTU discovery by default (setting DF and returning EMSGSIZE)
 // It should be safe to enable discovery for SCTP.
@@ -50,6 +50,9 @@ using std::shared_ptr;
 
 namespace rtc {
 
+std::unordered_set<SctpTransport *> SctpTransport::Instances;
+std::shared_mutex SctpTransport::InstancesMutex;
+
 void SctpTransport::Init() {
 	usrsctp_init(0, &SctpTransport::WriteCallback, nullptr);
 	usrsctp_sysctl_set_sctp_ecn_enable(0);
@@ -61,6 +64,20 @@ void SctpTransport::Init() {
 	usrsctp_sysctl_set_sctp_rto_initial_default(1 * 1000);         // ms
 	usrsctp_sysctl_set_sctp_init_rto_max_default(10 * 1000);       // ms
 	usrsctp_sysctl_set_sctp_heartbeat_interval_default(10 * 1000); // ms
+
+	usrsctp_sysctl_set_sctp_max_chunks_on_queue(10 * 1024);
+
+	// Change congestion control from the default TCP Reno (RFC 2581) to H-TCP
+	usrsctp_sysctl_set_sctp_default_cc_module(SCTP_CC_HTCP);
+
+	// Enable Non-Renegable Selective Acknowledgments (NR-SACKs)
+	usrsctp_sysctl_set_sctp_nrsack_enable(1);
+
+	// Increase the initial window size to 10 MTUs (RFC 6928)
+	usrsctp_sysctl_set_sctp_initial_cwnd(10);
+
+	// Reduce SACK delay from the default 200ms to 20ms
+	usrsctp_sysctl_set_sctp_delayed_sack_time_default(20); // ms
 }
 
 void SctpTransport::Cleanup() {
@@ -71,18 +88,24 @@ void SctpTransport::Cleanup() {
 SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
                              message_callback recvCallback, amount_callback bufferedAmountCallback,
                              state_callback stateChangeCallback)
-    : Transport(lower, std::move(stateChangeCallback)), mPort(port),
+    : Transport(lower, std::move(stateChangeCallback)), mPort(port), mPendingRecvCount(0),
       mSendQueue(0, message_size_func), mBufferedAmountCallback(std::move(bufferedAmountCallback)) {
 	onRecv(recvCallback);
 
 	PLOG_DEBUG << "Initializing SCTP transport";
 
 	usrsctp_register_address(this);
-	mSock = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, &SctpTransport::RecvCallback,
-	                       &SctpTransport::SendCallback, 0, this);
+	{
+		std::unique_lock lock(InstancesMutex);
+		Instances.insert(this);
+	}
+
+	mSock = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, nullptr, nullptr, 0, nullptr);
 	if (!mSock)
 		throw std::runtime_error("Could not create SCTP socket, errno=" + std::to_string(errno));
 
+	usrsctp_set_upcall(mSock, &SctpTransport::UpcallCallback, this);
+
 	if (usrsctp_set_non_blocking(mSock, 1))
 		throw std::runtime_error("Unable to set non-blocking mode, errno=" + std::to_string(errno));
 
@@ -100,6 +123,10 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 	if (usrsctp_setsockopt(mSock, IPPROTO_SCTP, SCTP_ENABLE_STREAM_RESET, &av, sizeof(av)))
 		throw std::runtime_error("Could not set socket option SCTP_ENABLE_STREAM_RESET, errno=" +
 		                         std::to_string(errno));
+	int on = 1;
+	if (usrsctp_setsockopt(mSock, IPPROTO_SCTP, SCTP_RECVRCVINFO, &on, sizeof(on)))
+		throw std::runtime_error("Could set socket option SCTP_RECVRCVINFO, errno=" +
+		                         std::to_string(errno));
 
 	struct sctp_event se = {};
 	se.se_assoc_id = SCTP_ALL_ASSOC;
@@ -126,7 +153,7 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 
 	struct sctp_paddrparams spp = {};
 #if USE_PMTUD
-	// Enabled SCTP path MTU discovery
+	// Enable SCTP path MTU discovery
 	spp.spp_flags = SPP_PMTUD_ENABLE;
 #else
 	// Fall back to a safe MTU value.
@@ -158,28 +185,39 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 	// The default send and receive window size of usrsctp is 256KiB, which is too small for
 	// realistic RTTs, therefore we increase it to 1MiB for better performance.
 	// See https://bugzilla.mozilla.org/show_bug.cgi?id=1051685
-	int bufSize = 1024 * 1024;
-	if (usrsctp_setsockopt(mSock, SOL_SOCKET, SO_RCVBUF, &bufSize, sizeof(bufSize)))
+	int bufferSize = 1024 * 1024;
+	if (usrsctp_setsockopt(mSock, SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize)))
 		throw std::runtime_error("Could not set SCTP recv buffer size, errno=" +
 		                         std::to_string(errno));
-	if (usrsctp_setsockopt(mSock, SOL_SOCKET, SO_SNDBUF, &bufSize, sizeof(bufSize)))
+	if (usrsctp_setsockopt(mSock, SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize)))
 		throw std::runtime_error("Could not set SCTP send buffer size, errno=" +
 		                         std::to_string(errno));
+}
+
+SctpTransport::~SctpTransport() {
+	stop();
+	close();
+
+	usrsctp_deregister_address(this);
+	{
+		std::unique_lock lock(InstancesMutex);
+		Instances.erase(this);
+	}
+}
+
+void SctpTransport::start() {
+	Transport::start();
 
 	registerIncoming();
 	connect();
 }
 
-SctpTransport::~SctpTransport() {
-	stop();
-
-	if (mSock)
-		usrsctp_close(mSock);
-
-	usrsctp_deregister_address(this);
-}
-
 bool SctpTransport::stop() {
+	// Transport::stop() will unregister incoming() from the lower layer, therefore we need to make
+	// sure the thread from lower layers is not blocked in incoming() by the WrittenOnce condition.
+	mWrittenOnce = true;
+	mWrittenCondition.notify_all();
+
 	if (!Transport::stop())
 		return false;
 
@@ -190,11 +228,19 @@ bool SctpTransport::stop() {
 	return true;
 }
 
+void SctpTransport::close() {
+	if (mSock) {
+		mProcessor.join();
+		usrsctp_close(mSock);
+		mSock = nullptr;
+	}
+}
+
 void SctpTransport::connect() {
 	if (!mSock)
-		return;
+		throw std::logic_error("Attempted SCTP connect with closed socket");
 
-	PLOG_DEBUG << "SCTP connect";
+	PLOG_DEBUG << "SCTP connecting";
 	changeState(State::Connecting);
 
 	struct sockaddr_conn sconn = {};
@@ -226,9 +272,7 @@ void SctpTransport::shutdown() {
 		PLOG_WARNING << "SCTP shutdown failed, errno=" << errno;
 	}
 
-	// close() abort the connection when linger is disabled, call it now
-	usrsctp_close(mSock);
-	mSock = nullptr;
+	close();
 
 	PLOG_INFO << "SCTP disconnected";
 	changeState(State::Disconnected);
@@ -248,11 +292,11 @@ bool SctpTransport::send(message_ptr message) {
 		return true;
 
 	mSendQueue.push(message);
-	updateBufferedAmount(message->stream, message_size_func(message));
+	updateBufferedAmount(uint16_t(message->stream), long(message_size_func(message)));
 	return false;
 }
 
-void SctpTransport::close(unsigned int stream) {
+void SctpTransport::closeStream(unsigned int stream) {
 	send(make_message(0, Message::Reset, uint16_t(stream)));
 }
 
@@ -265,9 +309,9 @@ void SctpTransport::incoming(message_ptr message) {
 	// There could be a race condition here where we receive the remote INIT before the local one is
 	// sent, which would result in the connection being aborted. Therefore, we need to wait for data
 	// to be sent on our side (i.e. the local INIT) before proceeding.
-	{
+	if (!mWrittenOnce) { // test the atomic boolean is not set first to prevent a lock contention
 		std::unique_lock lock(mWriteMutex);
-		mWrittenCondition.wait(lock, [&]() { return mWrittenOnce || state() != State::Connected; });
+		mWrittenCondition.wait(lock, [&]() { return mWrittenOnce.load(); });
 	}
 
 	if (!message) {
@@ -281,14 +325,68 @@ void SctpTransport::incoming(message_ptr message) {
 	usrsctp_conninput(this, message->data(), message->size(), 0);
 }
 
+void SctpTransport::doRecv() {
+	std::lock_guard lock(mRecvMutex);
+	--mPendingRecvCount;
+	try {
+		while (true) {
+			const size_t bufferSize = 65536;
+			byte buffer[bufferSize];
+			socklen_t fromlen = 0;
+			struct sctp_rcvinfo info = {};
+			socklen_t infolen = sizeof(info);
+			unsigned int infotype = 0;
+			int flags = 0;
+			ssize_t len = usrsctp_recvv(mSock, buffer, bufferSize, nullptr, &fromlen, &info,
+			                            &infolen, &infotype, &flags);
+			if (len < 0) {
+				if (errno == EWOULDBLOCK || errno == EAGAIN || errno == ECONNRESET)
+					break;
+				else
+					throw std::runtime_error("SCTP recv failed, errno=" + std::to_string(errno));
+			}
+
+			PLOG_VERBOSE << "SCTP recv, len=" << len;
+
+			// SCTP_FRAGMENT_INTERLEAVE does not seem to work as expected for messages > 64KB,
+			// therefore partial notifications and messages need to be handled separately.
+			if (flags & MSG_NOTIFICATION) {
+				// SCTP event notification
+				mPartialNotification.insert(mPartialNotification.end(), buffer, buffer + len);
+				if (flags & MSG_EOR) {
+					// Notification is complete, process it
+					auto notification =
+					    reinterpret_cast<union sctp_notification *>(mPartialNotification.data());
+					processNotification(notification, mPartialNotification.size());
+					mPartialNotification.clear();
+				}
+			} else {
+				// SCTP message
+				mPartialMessage.insert(mPartialMessage.end(), buffer, buffer + len);
+				if (flags & MSG_EOR) {
+					// Message is complete, process it
+					if (infotype != SCTP_RECVV_RCVINFO)
+						throw std::runtime_error("Missing SCTP recv info");
+
+					processData(std::move(mPartialMessage), info.rcv_sid,
+					            PayloadId(ntohl(info.rcv_ppid)));
+					mPartialMessage.clear();
+				}
+			}
+		}
+	} catch (const std::exception &e) {
+		PLOG_WARNING << e.what();
+	}
+}
+
 bool SctpTransport::trySendQueue() {
 	// Requires mSendMutex to be locked
 	while (auto next = mSendQueue.peek()) {
-		auto message = *next;
+		message_ptr message = std::move(*next);
 		if (!trySendMessage(message))
 			return false;
 		mSendQueue.pop();
-		updateBufferedAmount(message->stream, -message_size_func(message));
+		updateBufferedAmount(uint16_t(message->stream), -long(message_size_func(message)));
 	}
 	return true;
 }
@@ -310,7 +408,7 @@ bool SctpTransport::trySendMessage(message_ptr message) {
 		ppid = PPID_CONTROL;
 		break;
 	case Message::Reset:
-		sendReset(message->stream);
+		sendReset(uint16_t(message->stream));
 		return true;
 	default:
 		// Ignore
@@ -338,12 +436,12 @@ bool SctpTransport::trySendMessage(message_ptr message) {
 		spa.sendv_sndinfo.snd_flags |= SCTP_UNORDERED;
 
 	switch (reliability.type) {
-	case Reliability::TYPE_PARTIAL_RELIABLE_REXMIT:
+	case Reliability::Type::Rexmit:
 		spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
 		spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_RTX;
 		spa.sendv_prinfo.pr_value = uint32_t(std::get<int>(reliability.rexmit));
 		break;
-	case Reliability::TYPE_PARTIAL_RELIABLE_TIMED:
+	case Reliability::Type::Timed:
 		spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
 		spa.sendv_prinfo.pr_policy = SCTP_PR_SCTP_TTL;
 		spa.sendv_prinfo.pr_value = uint32_t(std::get<milliseconds>(reliability.rexmit).count());
@@ -362,18 +460,20 @@ bool SctpTransport::trySendMessage(message_ptr message) {
 		ret = usrsctp_sendv(mSock, &zero, 1, nullptr, 0, &spa, sizeof(spa), SCTP_SENDV_SPA, 0);
 	}
 
-	if (ret >= 0) {
+	if (ret < 0) {
+		if (errno == EWOULDBLOCK || errno == EAGAIN) {
+			PLOG_VERBOSE << "SCTP sending not possible";
+			return false;
+		}
+
+		PLOG_ERROR << "SCTP sending failed, errno=" << errno;
+		throw std::runtime_error("Sending failed, errno=" + std::to_string(errno));
+	}
+
 	PLOG_VERBOSE << "SCTP sent size=" << message->size();
 	if (message->type == Message::Type::Binary || message->type == Message::Type::String)
 		mBytesSent += message->size();
 	return true;
-	} else if (errno == EWOULDBLOCK || errno == EAGAIN) {
-		PLOG_VERBOSE << "SCTP sending not possible";
-		return false;
-	} else {
-		PLOG_ERROR << "SCTP sending failed, errno=" << errno;
-		throw std::runtime_error("Sending failed, errno=" + std::to_string(errno));
-	}
 }
 
 void SctpTransport::updateBufferedAmount(uint16_t streamId, long delta) {
@@ -385,7 +485,13 @@ void SctpTransport::updateBufferedAmount(uint16_t streamId, long delta) {
 	else
 		it->second = amount;
 
+	mSendMutex.unlock();
+	try {
 		mBufferedAmountCallback(streamId, amount);
+	} catch (const std::exception &e) {
+		PLOG_DEBUG << "SCTP buffered amount callback: " << e.what();
+	}
+	mSendMutex.lock();
 }
 
 void SctpTransport::sendReset(uint16_t streamId) {
@@ -409,7 +515,7 @@ void SctpTransport::sendReset(uint16_t streamId) {
 		mWrittenCondition.wait_for(lock, 1000ms,
 		                           [&]() { return mWritten || state() != State::Connected; });
 	} else if (errno == EINVAL) {
-		PLOG_VERBOSE << "SCTP stream " << streamId << " already reset";
+		PLOG_DEBUG << "SCTP stream " << streamId << " already reset";
 	} else {
 		PLOG_WARNING << "SCTP reset stream " << streamId << " failed, errno=" << errno;
 	}
@@ -421,56 +527,36 @@ bool SctpTransport::safeFlush() {
 		return true;
 
 	} catch (const std::exception &e) {
-		PLOG_ERROR << "SCTP flush: " << e.what();
+		PLOG_WARNING << "SCTP flush: " << e.what();
 		return false;
 	}
 }
 
-int SctpTransport::handleRecv(struct socket *sock, union sctp_sockstore addr, const byte *data,
-                              size_t len, struct sctp_rcvinfo info, int flags) {
-	try {
-		PLOG_VERBOSE << "Handle recv, len=" << len;
-		if (!len)
-			return -1;
+void SctpTransport::handleUpcall() {
+	if (!mSock)
+		return;
 
-		// This is valid because SCTP_FRAGMENT_INTERLEAVE is set to level 0
-		// so partial messages and notifications may not be interleaved.
-		if (flags & MSG_EOR) {
-			if (!mPartialRecv.empty()) {
-				mPartialRecv.insert(mPartialRecv.end(), data, data + len);
-				data = mPartialRecv.data();
-				len = mPartialRecv.size();
-			}
-			// Message/Notification is complete, process it
-			if (flags & MSG_NOTIFICATION)
-				processNotification(reinterpret_cast<const union sctp_notification *>(data), len);
-			else
-				processData(data, len, info.rcv_sid, PayloadId(htonl(info.rcv_ppid)));
+	PLOG_VERBOSE << "Handle upcall";
 
-			mPartialRecv.clear();
-		} else {
-			// Message/Notification is not complete
-			mPartialRecv.insert(mPartialRecv.end(), data, data + len);
+	int events = usrsctp_get_events(mSock);
+
+	if (events & SCTP_EVENT_READ && mPendingRecvCount == 0) {
+		++mPendingRecvCount;
+		mProcessor.enqueue(&SctpTransport::doRecv, this);
 	}
-	} catch (const std::exception &e) {
-		PLOG_ERROR << "SCTP recv: " << e.what();
-		return -1;
-	}
-	return 0; // success
+
+	if (events & SCTP_EVENT_WRITE)
+		mProcessor.enqueue(&SctpTransport::safeFlush, this);
 }
 
-int SctpTransport::handleSend(size_t free) {
-	PLOG_VERBOSE << "Handle send, free=" << free;
-	return safeFlush() ? 0 : -1;
-}
-
-int SctpTransport::handleWrite(byte *data, size_t len, uint8_t tos, uint8_t set_df) {
+int SctpTransport::handleWrite(byte *data, size_t len, uint8_t /*tos*/, uint8_t /*set_df*/) {
 	try {
+		std::unique_lock lock(mWriteMutex);
 		PLOG_VERBOSE << "Handle write, len=" << len;
 
-		std::unique_lock lock(mWriteMutex);
 		if (!outgoing(make_message(data, data + len)))
 			return -1;
+
 		mWritten = true;
 		mWrittenOnce = true;
 		mWrittenCondition.notify_all();
@@ -482,62 +568,56 @@ int SctpTransport::handleWrite(byte *data, size_t len, uint8_t tos, uint8_t set_
 	return 0; // success
 }
 
-void SctpTransport::processData(const byte *data, size_t len, uint16_t sid, PayloadId ppid) {
-	PLOG_VERBOSE << "Process data, len=" << len;
+void SctpTransport::processData(binary &&data, uint16_t sid, PayloadId ppid) {
+	PLOG_VERBOSE << "Process data, size=" << data.size();
 
 	// The usage of the PPIDs "WebRTC String Partial" and "WebRTC Binary Partial" is deprecated.
 	// See https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-13#section-6.6
 	// We handle them at reception for compatibility reasons but should never send them.
 	switch (ppid) {
 	case PPID_CONTROL:
-		recv(make_message(data, data + len, Message::Control, sid));
+		recv(make_message(std::move(data), Message::Control, sid));
 		break;
 
 	case PPID_STRING_PARTIAL: // deprecated
-		mPartialStringData.insert(mPartialStringData.end(), data, data + len);
+		mPartialStringData.insert(mPartialStringData.end(), data.begin(), data.end());
 		break;
 
 	case PPID_STRING:
 		if (mPartialStringData.empty()) {
-			mBytesReceived += len;
-			recv(make_message(data, data + len, Message::String, sid));
+			mBytesReceived += data.size();
+			recv(make_message(std::move(data), Message::String, sid));
 		} else {
-			mPartialStringData.insert(mPartialStringData.end(), data, data + len);
+			mPartialStringData.insert(mPartialStringData.end(), data.begin(), data.end());
 			mBytesReceived += mPartialStringData.size();
-			recv(make_message(mPartialStringData.begin(), mPartialStringData.end(), Message::String,
-			                  sid));
+			recv(make_message(std::move(mPartialStringData), Message::String, sid));
 			mPartialStringData.clear();
 		}
 		break;
 
 	case PPID_STRING_EMPTY:
-		// This only accounts for when the partial data is empty
-		recv(make_message(mPartialStringData.begin(), mPartialStringData.end(), Message::String,
-		                  sid));
+		recv(make_message(std::move(mPartialStringData), Message::String, sid));
 		mPartialStringData.clear();
 		break;
 
 	case PPID_BINARY_PARTIAL: // deprecated
-		mPartialBinaryData.insert(mPartialBinaryData.end(), data, data + len);
+		mPartialBinaryData.insert(mPartialBinaryData.end(), data.begin(), data.end());
 		break;
 
 	case PPID_BINARY:
 		if (mPartialBinaryData.empty()) {
-			mBytesReceived += len;
-			recv(make_message(data, data + len, Message::Binary, sid));
+			mBytesReceived += data.size();
+			recv(make_message(std::move(data), Message::Binary, sid));
 		} else {
-			mPartialBinaryData.insert(mPartialBinaryData.end(), data, data + len);
-			mBytesReceived += mPartialStringData.size();
-			recv(make_message(mPartialBinaryData.begin(), mPartialBinaryData.end(), Message::Binary,
-			                  sid));
+			mPartialBinaryData.insert(mPartialBinaryData.end(), data.begin(), data.end());
+			mBytesReceived += mPartialBinaryData.size();
+			recv(make_message(std::move(mPartialBinaryData), Message::Binary, sid));
 			mPartialBinaryData.clear();
 		}
 		break;
 
 	case PPID_BINARY_EMPTY:
-		// This only accounts for when the partial data is empty
-		recv(make_message(mPartialBinaryData.begin(), mPartialBinaryData.end(), Message::Binary,
-		                  sid));
+		recv(make_message(std::move(mPartialBinaryData), Message::Binary, sid));
 		mPartialBinaryData.clear();
 		break;
 
@@ -555,7 +635,7 @@ void SctpTransport::processNotification(const union sctp_notification *notify, s
 	}
 
 	auto type = notify->sn_header.sn_type;
-	PLOG_VERBOSE << "Process notification, type=" << type;
+	PLOG_VERBOSE << "Processing notification, type=" << type;
 
 	switch (type) {
 	case SCTP_ASSOC_CHANGE: {
@@ -577,7 +657,8 @@ void SctpTransport::processNotification(const union sctp_notification *notify, s
 	}
 
 	case SCTP_SENDER_DRY_EVENT: {
-		// It not should be necessary since the send callback should have been called already,
+		PLOG_VERBOSE << "SCTP dry event";
+		// It should not be necessary since the send callback should have been called already,
 		// but to be sure, let's try to send now.
 		safeFlush();
 		break;
@@ -588,10 +669,32 @@ void SctpTransport::processNotification(const union sctp_notification *notify, s
 		const int count = (reset_event.strreset_length - sizeof(reset_event)) / sizeof(uint16_t);
 		const uint16_t flags = reset_event.strreset_flags;
 
+		IF_PLOG(plog::verbose) {
+			std::ostringstream desc;
+			desc << "flags=";
+			if (flags & SCTP_STREAM_RESET_OUTGOING_SSN && flags & SCTP_STREAM_RESET_INCOMING_SSN)
+				desc << "outgoing|incoming";
+			else if (flags & SCTP_STREAM_RESET_OUTGOING_SSN)
+				desc << "outgoing";
+			else if (flags & SCTP_STREAM_RESET_INCOMING_SSN)
+				desc << "incoming";
+			else
+				desc << "0";
+
+			desc << ", streams=[";
+			for (int i = 0; i < count; ++i) {
+				uint16_t streamId = reset_event.strreset_stream_list[i];
+				desc << (i != 0 ? "," : "") << streamId;
+			}
+			desc << "]";
+
+			PLOG_VERBOSE << "SCTP reset event, " << desc.str();
+		}
+
 		if (flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
 			for (int i = 0; i < count; ++i) {
 				uint16_t streamId = reset_event.strreset_stream_list[i];
-				close(streamId);
+				closeStream(streamId);
 			}
 		}
 		if (flags & SCTP_STREAM_RESET_INCOMING_SSN) {
@@ -633,28 +736,26 @@ std::optional<milliseconds> SctpTransport::rtt() {
 	return milliseconds(status.sstat_primary.spinfo_srtt);
 }
 
-int SctpTransport::RecvCallback(struct socket *sock, union sctp_sockstore addr, void *data,
-                                size_t len, struct sctp_rcvinfo recv_info, int flags, void *ptr) {
-	int ret = static_cast<SctpTransport *>(ptr)->handleRecv(
-	    sock, addr, static_cast<const byte *>(data), len, recv_info, flags);
-	free(data);
-	return ret;
-}
+void SctpTransport::UpcallCallback(struct socket *, void *arg, int /* flags */) {
+	auto *transport = static_cast<SctpTransport *>(arg);
 
-int SctpTransport::SendCallback(struct socket *sock, uint32_t sb_free) {
-	struct sctp_paddrinfo paddrinfo = {};
-	socklen_t len = sizeof(paddrinfo);
-	if (usrsctp_getsockopt(sock, IPPROTO_SCTP, SCTP_GET_PEER_ADDR_INFO, &paddrinfo, &len))
-		return -1;
+	std::shared_lock lock(InstancesMutex);
+	if (Instances.find(transport) == Instances.end())
+		return;
 
-	auto sconn = reinterpret_cast<struct sockaddr_conn *>(&paddrinfo.spinfo_address);
-	void *ptr = sconn->sconn_addr;
-	return static_cast<SctpTransport *>(ptr)->handleSend(size_t(sb_free));
+	transport->handleUpcall();
 }
 
 int SctpTransport::WriteCallback(void *ptr, void *data, size_t len, uint8_t tos, uint8_t set_df) {
-	return static_cast<SctpTransport *>(ptr)->handleWrite(static_cast<byte *>(data), len, tos,
-	                                                      set_df);
+	auto *transport = static_cast<SctpTransport *>(ptr);
+
+	// Workaround for sctplab/usrsctp#405: Send callback is invoked on already closed socket
+	// https://github.com/sctplab/usrsctp/issues/405
+	std::shared_lock lock(InstancesMutex);
+	if (Instances.find(transport) == Instances.end())
+		return -1;
+
+	return transport->handleWrite(static_cast<byte *>(data), len, tos, set_df);
 }
 
 } // namespace rtc

src/sctptransport.hpp

@@ -21,19 +21,23 @@
 
 #include "include.hpp"
 #include "peerconnection.hpp"
+#include "processor.hpp"
 #include "queue.hpp"
 #include "transport.hpp"
+#include "processor.hpp"
 
 #include <condition_variable>
 #include <functional>
 #include <map>
 #include <mutex>
+#include <shared_mutex>
+#include <unordered_set>
 
 #include "usrsctp.h"
 
 namespace rtc {
 
-class SctpTransport : public Transport {
+class SctpTransport final : public Transport {
 public:
 	static void Init();
 	static void Cleanup();
@@ -44,9 +48,10 @@ public:
 	              amount_callback bufferedAmountCallback, state_callback stateChangeCallback);
 	~SctpTransport();
 
+	void start() override;
 	bool stop() override;
 	bool send(message_ptr message) override; // false if buffered
-	void close(unsigned int stream);
+	void closeStream(unsigned int stream);
 	void flush();
 
 	// Stats
@@ -70,26 +75,28 @@ private:
 
 	void connect();
 	void shutdown();
+	void close();
 	void incoming(message_ptr message) override;
 
+	void doRecv();
 	bool trySendQueue();
 	bool trySendMessage(message_ptr message);
 	void updateBufferedAmount(uint16_t streamId, long delta);
 	void sendReset(uint16_t streamId);
 	bool safeFlush();
 
-	int handleRecv(struct socket *sock, union sctp_sockstore addr, const byte *data, size_t len,
-	               struct sctp_rcvinfo recv_info, int flags);
-	int handleSend(size_t free);
+	void handleUpcall();
 	int handleWrite(byte *data, size_t len, uint8_t tos, uint8_t set_df);
 
-	void processData(const byte *data, size_t len, uint16_t streamId, PayloadId ppid);
+	void processData(binary &&data, uint16_t streamId, PayloadId ppid);
 	void processNotification(const union sctp_notification *notify, size_t len);
 
 	const uint16_t mPort;
 	struct socket *mSock;
 
-	std::mutex mSendMutex;
+	Processor mProcessor;
+	std::atomic<int> mPendingRecvCount;
+	std::mutex mRecvMutex, mSendMutex;
 	Queue<message_ptr> mSendQueue;
 	std::map<uint16_t, size_t> mBufferedAmount;
 	amount_callback mBufferedAmountCallback;
@@ -97,17 +104,19 @@ private:
 	std::mutex mWriteMutex;
 	std::condition_variable mWrittenCondition;
 	std::atomic<bool> mWritten = false;     // written outside lock
-	bool mWrittenOnce = false;
+	std::atomic<bool> mWrittenOnce = false; // same
 
-	binary mPartialRecv, mPartialStringData, mPartialBinaryData;
+	binary mPartialMessage, mPartialNotification;
+	binary mPartialStringData, mPartialBinaryData;
 
 	// Stats
 	std::atomic<size_t> mBytesSent = 0, mBytesReceived = 0;
 
-	static int RecvCallback(struct socket *sock, union sctp_sockstore addr, void *data, size_t len,
-	                        struct sctp_rcvinfo recv_info, int flags, void *user_data);
-	static int SendCallback(struct socket *sock, uint32_t sb_free);
+	static void UpcallCallback(struct socket *sock, void *arg, int flags);
 	static int WriteCallback(void *sctp_ptr, void *data, size_t len, uint8_t tos, uint8_t set_df);
+
+	static std::unordered_set<SctpTransport *> Instances;
+	static std::shared_mutex InstancesMutex;
 };
 
 } // namespace rtc

src/tcptransport.cpp

@@ -21,6 +21,7 @@
 #if RTC_ENABLE_WEBSOCKET
 
 #include <exception>
+
 #ifndef _WIN32
 #include <fcntl.h>
 #include <unistd.h>
@@ -37,8 +38,8 @@ SelectInterrupter::SelectInterrupter() {
 		throw std::runtime_error("Failed to create pipe");
 	::fcntl(pipefd[0], F_SETFL, O_NONBLOCK);
 	::fcntl(pipefd[1], F_SETFL, O_NONBLOCK);
-	mPipeOut = pipefd[0]; // read
-	mPipeIn = pipefd[1];  // write
+	mPipeOut = pipefd[1]; // read
+	mPipeIn = pipefd[0];  // write
 #endif
 }
 
@@ -53,19 +54,16 @@ SelectInterrupter::~SelectInterrupter() {
 #endif
 }
 
-int SelectInterrupter::prepare(fd_set &readfds, fd_set &writefds) {
+int SelectInterrupter::prepare(fd_set &readfds, [[maybe_unused]] fd_set &writefds) {
 	std::lock_guard lock(mMutex);
 #ifdef _WIN32
 	if (mDummySock == INVALID_SOCKET)
 		mDummySock = ::socket(AF_INET, SOCK_DGRAM, 0);
 	FD_SET(mDummySock, &readfds);
-	return SOCK_TO_INT(mDummySock) + 1;
+	return SOCKET_TO_INT(mDummySock) + 1;
 #else
-	int ret;
-	do {
 	char dummy;
-		ret = ::read(mPipeIn, &dummy, 1);
-	} while (ret > 0);
+	::read(mPipeIn, &dummy, 1);
 	FD_SET(mPipeIn, &readfds);
 	return mPipeIn + 1;
 #endif
@@ -88,11 +86,15 @@ TcpTransport::TcpTransport(const string &hostname, const string &service, state_
     : Transport(nullptr, std::move(callback)), mHostname(hostname), mService(service) {
 
 	PLOG_DEBUG << "Initializing TCP transport";
-	mThread = std::thread(&TcpTransport::runLoop, this);
 }
 
-TcpTransport::~TcpTransport() {
-	stop();
+TcpTransport::~TcpTransport() { stop(); }
+
+void TcpTransport::start() {
+	Transport::start();
+
+	PLOG_DEBUG << "Starting TCP recv thread";
+	mThread = std::thread(&TcpTransport::runLoop, this);
 }
 
 bool TcpTransport::stop() {
@@ -106,6 +108,7 @@ bool TcpTransport::stop() {
 }
 
 bool TcpTransport::send(message_ptr message) {
+	std::unique_lock lock(mSockMutex);
 	if (state() != State::Connected)
 		return false;
 
@@ -125,6 +128,7 @@ void TcpTransport::incoming(message_ptr message) {
 }
 
 bool TcpTransport::outgoing(message_ptr message) {
+	// mSockMutex must be locked
 	// If nothing is pending, try to send directly
 	// It's safe because if the queue is empty, the thread is not sending
 	if (mSendQueue.empty() && trySendMessage(message))
@@ -150,7 +154,7 @@ void TcpTransport::connect(const string &hostname, const string &service) {
 
 	for (auto p = result; p; p = p->ai_next) {
 		try {
-			connect(p->ai_addr, p->ai_addrlen);
+			connect(p->ai_addr, socklen_t(p->ai_addrlen));
 
 			PLOG_INFO << "Connected to " << hostname << ":" << service;
 			freeaddrinfo(result);
@@ -173,6 +177,7 @@ void TcpTransport::connect(const string &hostname, const string &service) {
 }
 
 void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
+	std::unique_lock lock(mSockMutex);
 	try {
 		char node[MAX_NUMERICNODE_LEN];
 		char serv[MAX_NUMERICSERV_LEN];
@@ -201,22 +206,27 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 
 		// Initiate connection
 		int ret = ::connect(mSock, addr, addrlen);
-		if (ret < 0 && errno != EINPROGRESS) {
+		if (ret < 0 && sockerrno != SEINPROGRESS && sockerrno != SEWOULDBLOCK) {
 			std::ostringstream msg;
 			msg << "TCP connection to " << node << ":" << serv << " failed, errno=" << sockerrno;
 			throw std::runtime_error(msg.str());
 		}
 
+		while (true) {
 			fd_set writefds;
 			FD_ZERO(&writefds);
 			FD_SET(mSock, &writefds);
 			struct timeval tv;
-		tv.tv_sec = 10; // TODO
+			tv.tv_sec = 10; // TODO: Make the timeout configurable
 			tv.tv_usec = 0;
 			ret = ::select(SOCKET_TO_INT(mSock) + 1, NULL, &writefds, NULL, &tv);
 
-		if (ret < 0)
+			if (ret < 0) {
+				if (sockerrno == SEINTR || sockerrno == SEAGAIN) // interrupted
+					continue;
+				else
 					throw std::runtime_error("Failed to wait for socket connection");
+			}
 
 			if (ret == 0) {
 				std::ostringstream msg;
@@ -226,7 +236,7 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 
 			int error = 0;
 			socklen_t errorlen = sizeof(error);
-		if (::getsockopt(mSock, SOL_SOCKET, SO_ERROR, &error, &errorlen) != 0)
+			if (::getsockopt(mSock, SOL_SOCKET, SO_ERROR, (char *)&error, &errorlen) != 0)
 				throw std::runtime_error("Failed to get socket error code");
 
 			if (error != 0) {
@@ -236,7 +246,8 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 			}
 
 			PLOG_DEBUG << "TCP connection to " << node << ":" << serv << " succeeded";
-
+			break;
+		}
 	} catch (...) {
 		if (mSock != INVALID_SOCKET) {
 			::closesocket(mSock);
@@ -247,17 +258,20 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 }
 
 void TcpTransport::close() {
+	std::unique_lock lock(mSockMutex);
 	if (mSock != INVALID_SOCKET) {
 		PLOG_DEBUG << "Closing TCP socket";
 		::closesocket(mSock);
 		mSock = INVALID_SOCKET;
 	}
 	changeState(State::Disconnected);
+	interruptSelect();
 }
 
 bool TcpTransport::trySendQueue() {
+	// mSockMutex must be locked
 	while (auto next = mSendQueue.peek()) {
-		auto message = *next;
+		message_ptr message = std::move(*next);
 		if (!trySendMessage(message)) {
 			mSendQueue.exchange(message);
 			return false;
@@ -268,17 +282,18 @@ bool TcpTransport::trySendQueue() {
 }
 
 bool TcpTransport::trySendMessage(message_ptr &message) {
+	// mSockMutex must be locked
 	auto data = reinterpret_cast<const char *>(message->data());
 	auto size = message->size();
 	while (size) {
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(_WIN32)
 		int flags = 0;
 #else
 		int flags = MSG_NOSIGNAL;
 #endif
-		int len = ::send(mSock, data, size, flags);
+		int len = ::send(mSock, data, int(size), flags);
 		if (len < 0) {
-			if (errno == EAGAIN || errno == EWOULDBLOCK) {
+			if (sockerrno == SEAGAIN || sockerrno == SEWOULDBLOCK) {
 				message = make_message(message->end() - size, message->end());
 				return false;
 			} else {
@@ -313,17 +328,27 @@ void TcpTransport::runLoop() {
 		changeState(State::Connected);
 
 		while (true) {
+			std::unique_lock lock(mSockMutex);
+			if (mSock == INVALID_SOCKET)
+				break;
+
 			fd_set readfds, writefds;
 			int n = prepareSelect(readfds, writefds);
 
 			struct timeval tv;
 			tv.tv_sec = 10;
 			tv.tv_usec = 0;
+			lock.unlock();
 			int ret = ::select(n, &readfds, &writefds, NULL, &tv);
+			lock.lock();
+			if (mSock == INVALID_SOCKET)
+				break;
+
 			if (ret < 0) {
 				throw std::runtime_error("Failed to wait on socket");
 			} else if (ret == 0) {
 				PLOG_VERBOSE << "TCP is idle";
+				lock.unlock(); // unlock now since the upper layer might send on incoming
 				incoming(make_message(0));
 				continue;
 			}
@@ -335,7 +360,7 @@ void TcpTransport::runLoop() {
 				char buffer[bufferSize];
 				int len = ::recv(mSock, buffer, bufferSize, 0);
 				if (len < 0) {
-					if (errno == EAGAIN || errno == EWOULDBLOCK) {
+					if (sockerrno == SEAGAIN || sockerrno == SEWOULDBLOCK) {
 						continue;
 					} else {
 						throw std::runtime_error("Connection lost");
@@ -345,6 +370,7 @@ void TcpTransport::runLoop() {
 				if (len == 0)
 					break; // clean close
 
+				lock.unlock(); // unlock now since the upper layer might send on incoming
 				auto *b = reinterpret_cast<byte *>(buffer);
 				incoming(make_message(b, b + len));
 			}

src/tcptransport.hpp

@@ -56,6 +56,7 @@ public:
 	TcpTransport(const string &hostname, const string &service, state_callback callback);
 	~TcpTransport();
 
+	void start() override;
 	bool stop() override;
 	bool send(message_ptr message) override;
 
@@ -78,6 +79,7 @@ private:
 	string mHostname, mService;
 
 	socket_t mSock = INVALID_SOCKET;
+	std::mutex mSockMutex;
 	std::thread mThread;
 	SelectInterrupter mInterrupter;
 	Queue<message_ptr> mSendQueue;

src/threadpool.cpp

@@ -0,0 +1,77 @@
+/**
+ * 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 "threadpool.hpp"
+
+namespace rtc {
+
+ThreadPool &ThreadPool::Instance() {
+	// Init handles joining on cleanup
+	static ThreadPool *instance = new ThreadPool;
+	return *instance;
+}
+
+ThreadPool::~ThreadPool() { join(); }
+
+int ThreadPool::count() const {
+	std::unique_lock lock(mWorkersMutex);
+	return int(mWorkers.size());
+}
+
+void ThreadPool::spawn(int count) {
+	std::unique_lock lock(mWorkersMutex);
+	mJoining = false;
+	while (count-- > 0)
+		mWorkers.emplace_back(std::bind(&ThreadPool::run, this));
+}
+
+void ThreadPool::join() {
+	std::unique_lock lock(mWorkersMutex);
+	mJoining = true;
+	mCondition.notify_all();
+
+	for (auto &w : mWorkers)
+		w.join();
+
+	mWorkers.clear();
+}
+
+void ThreadPool::run() {
+	while (runOne()) {
+	}
+}
+
+bool ThreadPool::runOne() {
+	if (auto task = dequeue()) {
+		task();
+		return true;
+	}
+	return false;
+}
+
+std::function<void()> ThreadPool::dequeue() {
+	std::unique_lock lock(mMutex);
+	mCondition.wait(lock, [this]() { return !mTasks.empty() || mJoining; });
+	if (mTasks.empty())
+		return nullptr;
+	auto task = std::move(mTasks.front());
+	mTasks.pop();
+	return task;
+}
+
+} // namespace rtc

src/threadpool.hpp

@@ -0,0 +1,94 @@
+/**
+ * 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_THREADPOOL_H
+#define RTC_THREADPOOL_H
+
+#include "include.hpp"
+#include "init.hpp"
+
+#include <condition_variable>
+#include <functional>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <stdexcept>
+#include <thread>
+#include <vector>
+
+namespace rtc {
+
+template <class F, class... Args>
+using invoke_future_t = std::future<std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>>;
+
+class ThreadPool final {
+public:
+	static ThreadPool &Instance();
+
+	ThreadPool(const ThreadPool &) = delete;
+	ThreadPool &operator=(const ThreadPool &) = delete;
+	ThreadPool(ThreadPool &&) = delete;
+	ThreadPool &operator=(ThreadPool &&) = delete;
+
+	int count() const;
+	void spawn(int count = 1);
+	void join();
+	void run();
+	bool runOne();
+
+	template <class F, class... Args>
+	auto enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...>;
+
+protected:
+	ThreadPool() = default;
+	~ThreadPool();
+
+	std::function<void()> dequeue(); // returns null function if joining
+
+	std::vector<std::thread> mWorkers;
+	std::queue<std::function<void()>> mTasks;
+	std::atomic<bool> mJoining = false;
+
+	mutable std::mutex mMutex, mWorkersMutex;
+	std::condition_variable mCondition;
+};
+
+template <class F, class... Args>
+auto ThreadPool::enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...> {
+	std::unique_lock lock(mMutex);
+	using R = std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>;
+	auto bound = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
+	auto task = std::make_shared<std::packaged_task<R()>>([bound = std::move(bound)]() mutable {
+		try {
+			return bound();
+		} catch (const std::exception &e) {
+			PLOG_WARNING << e.what();
+			throw;
+		}
+	});
+	std::future<R> result = task->get_future();
+
+	mTasks.emplace([task = std::move(task), token = Init::Token()]() { return (*task)(); });
+	mCondition.notify_one();
+	return result;
+}
+
+} // namespace rtc
+
+#endif

src/tls.cpp

@@ -85,11 +85,9 @@ void init() {
 	static bool done = false;
 
 	std::lock_guard lock(mutex);
-	if (!done) {
-		OPENSSL_init_ssl(0, NULL);
-		SSL_load_error_strings();
-		ERR_load_crypto_strings();
-		done = true;
+	if (!std::exchange(done, true)) {
+		OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, nullptr);
+		OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, nullptr);
 	}
 }
 
@@ -129,4 +127,3 @@ bool check(SSL *ssl, int ret, const string &message) {
 } // namespace rtc::openssl
 
 #endif
-

src/tls.hpp

@@ -48,12 +48,19 @@ gnutls_datum_t make_datum(char *data, size_t size);
 
 #else // USE_GNUTLS==0
 
+#ifdef _WIN32
+// Include winsock2.h header first since OpenSSL may include winsock.h
+#include <winsock2.h>
+#endif
+
 #include <openssl/ssl.h>
 
 #include <openssl/bio.h>
+#include <openssl/bn.h>
 #include <openssl/ec.h>
 #include <openssl/err.h>
 #include <openssl/pem.h>
+#include <openssl/rsa.h>
 #include <openssl/x509.h>
 
 #ifndef BIO_EOF

src/tlstransport.cpp

@@ -56,7 +56,6 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 	try {
 		gnutls::check(gnutls_certificate_set_x509_system_trust(mCreds));
 		gnutls::check(gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, mCreds));
-		gnutls_session_set_verify_cert(mSession, mHost.c_str(), 0);
 
 		const char *priorities = "SECURE128:-VERS-SSL3.0:-ARCFOUR-128";
 		const char *err_pos = NULL;
@@ -72,9 +71,6 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 		gnutls_transport_set_pull_function(mSession, ReadCallback);
 		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
 
-       	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
-		registerIncoming();
-
 	} catch (...) {
 		gnutls_deinit(mSession);
 		gnutls_certificate_free_credentials(mCreds);
@@ -89,6 +85,15 @@ TlsTransport::~TlsTransport() {
 	gnutls_certificate_free_credentials(mCreds);
 }
 
+void TlsTransport::start() {
+	Transport::start();
+
+	registerIncoming();
+
+	PLOG_DEBUG << "Starting TLS recv thread";
+	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+}
+
 bool TlsTransport::stop() {
 	if (!Transport::stop())
 		return false;
@@ -105,7 +110,7 @@ bool TlsTransport::send(message_ptr message) {
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
-	if(message->size() == 0)
+	if (message->size() == 0)
 		return true;
 
 	ssize_t ret;
@@ -123,6 +128,10 @@ void TlsTransport::incoming(message_ptr message) {
 		mIncomingQueue.stop();
 }
 
+void TlsTransport::postHandshake() {
+	// Dummy
+}
+
 void TlsTransport::runRecvLoop() {
 	const size_t bufferSize = 4096;
 	char buffer[bufferSize];
@@ -147,6 +156,7 @@ void TlsTransport::runRecvLoop() {
 	try {
 		PLOG_INFO << "TLS handshake finished";
 		changeState(State::Connected);
+		postHandshake();
 
 		while (true) {
 			ssize_t ret;
@@ -197,10 +207,10 @@ ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_
 	message_ptr &message = t->mIncomingMessage;
 	size_t &position = t->mIncomingMessagePosition;
 
-	if(message && position >= message->size())
+	if (message && position >= message->size())
 		message.reset();
 
-	if(!message) {
+	if (!message) {
 		position = 0;
 		while (auto next = t->mIncomingQueue.pop()) {
 			message = *next;
@@ -211,15 +221,14 @@ ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_
 		}
 	}
 
-	if(message) {
+	if (message) {
 		size_t available = message->size() - position;
 		ssize_t len = std::min(maxlen, available);
 		std::memcpy(data, message->data() + position, len);
-		position+= len;
+		position += len;
 		gnutls_transport_set_errno(t->mSession, 0);
 		return len;
-	}
-	else {
+	} else {
 		// Closed
 		gnutls_transport_set_errno(t->mSession, 0);
 		return 0;
@@ -228,11 +237,9 @@ ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_
 
 int TlsTransport::TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms) {
 	TlsTransport *t = static_cast<TlsTransport *>(ptr);
-	if (ms != GNUTLS_INDEFINITE_TIMEOUT)
-		t->mIncomingQueue.wait(milliseconds(ms));
-	else
-		t->mIncomingQueue.wait();
-	return !t->mIncomingQueue.empty() ? 1 : 0;
+	bool notEmpty = t->mIncomingQueue.wait(
+	    ms != GNUTLS_INDEFINITE_TIMEOUT ? std::make_optional(milliseconds(ms)) : nullopt);
+	return notEmpty ? 1 : 0;
 }
 
 #else // USE_GNUTLS==0
@@ -263,15 +270,16 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 		openssl::check(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
 		               "Failed to set SSL priorities");
 
+		if (!SSL_CTX_set_default_verify_paths(mCtx)) {
+			PLOG_WARNING << "SSL root CA certificates unavailable";
+		}
+
 		SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3);
 		SSL_CTX_set_min_proto_version(mCtx, TLS1_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_default_verify_paths(mCtx);
-		SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER, NULL);
-		SSL_CTX_set_verify_depth(mCtx, 4);
+		SSL_CTX_set_verify(mCtx, SSL_VERIFY_NONE, NULL);
 
 		if (!(mSsl = SSL_new(mCtx)))
 			throw std::runtime_error("Failed to create SSL instance");
@@ -298,9 +306,6 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
 		SSL_set_tmp_ecdh(mSsl, ecdh.get());
 
-		mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
-		registerIncoming();
-
 	} catch (...) {
 		if (mSsl)
 			SSL_free(mSsl);
@@ -317,6 +322,15 @@ TlsTransport::~TlsTransport() {
 	SSL_CTX_free(mCtx);
 }
 
+void TlsTransport::start() {
+	Transport::start();
+
+	registerIncoming();
+
+	PLOG_DEBUG << "Starting TLS recv thread";
+	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+}
+
 bool TlsTransport::stop() {
 	if (!Transport::stop())
 		return false;
@@ -337,7 +351,7 @@ bool TlsTransport::send(message_ptr message) {
 	if (message->size() == 0)
 		return true;
 
-	int ret = SSL_write(mSsl, message->data(), message->size());
+	int ret = SSL_write(mSsl, message->data(), int(message->size()));
 	if (!openssl::check(mSsl, ret))
 		return false;
 
@@ -356,6 +370,10 @@ void TlsTransport::incoming(message_ptr message) {
 		mIncomingQueue.stop();
 }
 
+void TlsTransport::postHandshake() {
+	// Dummy
+}
+
 void TlsTransport::runRecvLoop() {
 	const size_t bufferSize = 4096;
 	byte buffer[bufferSize];
@@ -377,6 +395,7 @@ void TlsTransport::runRecvLoop() {
 				if (SSL_is_init_finished(mSsl)) {
 					PLOG_INFO << "TLS handshake finished";
 					changeState(State::Connected);
+					postHandshake();
 				}
 			} else {
 				int ret = SSL_read(mSsl, buffer, bufferSize);
@@ -391,9 +410,9 @@ void TlsTransport::runRecvLoop() {
 			if (!next)
 				break;
 
-			message_ptr message = *next;
+			message_ptr message = std::move(*next);
 			if (message->size() > 0)
-				BIO_write(mInBio, message->data(), message->size()); // Input
+				BIO_write(mInBio, message->data(), int(message->size())); // Input
 			else
 				recv(message); // Pass zero-sized messages through
 		}

src/tlstransport.hpp

@@ -26,7 +26,6 @@
 
 #if RTC_ENABLE_WEBSOCKET
 
-#include <mutex>
 #include <thread>
 
 namespace rtc {
@@ -39,14 +38,15 @@ public:
 	static void Cleanup();
 
 	TlsTransport(std::shared_ptr<TcpTransport> lower, string host, state_callback callback);
-	~TlsTransport();
+	virtual ~TlsTransport();
 
+	void start() override;
 	bool stop() override;
 	bool send(message_ptr message) override;
 
-	void incoming(message_ptr message) override;
-
 protected:
+	virtual void incoming(message_ptr message) override;
+	virtual void postHandshake();
 	void runRecvLoop();
 
 	string mHost;

src/track.cpp

@@ -0,0 +1,177 @@
+/**
+ * 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 "track.hpp"
+#include "dtlssrtptransport.hpp"
+#include "include.hpp"
+
+namespace rtc {
+
+using std::shared_ptr;
+using std::weak_ptr;
+
+Track::Track(Description::Media description)
+    : mMediaDescription(std::move(description)), mRecvQueue(RECV_QUEUE_LIMIT, message_size_func) {}
+
+string Track::mid() const { return mMediaDescription.mid(); }
+
+Description::Media Track::description() const { return mMediaDescription; }
+
+void Track::setDescription(Description::Media description) {
+	if (description.mid() != mMediaDescription.mid())
+		throw std::logic_error("Media description mid does not match track mid");
+
+	mMediaDescription = std::move(description);
+}
+
+void Track::close() {
+	mIsClosed = true;
+	resetCallbacks();
+	setRtcpHandler(nullptr);
+}
+
+bool Track::send(message_variant data) { return outgoing(make_message(std::move(data))); }
+
+bool Track::send(const byte *data, size_t size) {
+	return outgoing(std::make_shared<Message>(data, data + size, Message::Binary));
+}
+
+std::optional<message_variant> Track::receive() {
+	if (auto next = mRecvQueue.tryPop())
+		return to_variant(std::move(**next));
+
+	return nullopt;
+}
+
+std::optional<message_variant> Track::peek() {
+	if (auto next = mRecvQueue.peek())
+		return to_variant(std::move(**next));
+
+	return nullopt;
+}
+
+bool Track::isOpen(void) const {
+#if RTC_ENABLE_MEDIA
+	return !mIsClosed && mDtlsSrtpTransport.lock();
+#else
+	return !mIsClosed;
+#endif
+}
+
+bool Track::isClosed(void) const { return mIsClosed; }
+
+size_t Track::maxMessageSize() const {
+	return 65535 - 12 - 4; // SRTP/UDP
+}
+
+size_t Track::availableAmount() const { return mRecvQueue.amount(); }
+
+#if RTC_ENABLE_MEDIA
+void Track::open(shared_ptr<DtlsSrtpTransport> transport) {
+	mDtlsSrtpTransport = transport;
+	triggerOpen();
+}
+#endif
+
+bool Track::outgoing(message_ptr message) {
+
+	if (mRtcpHandler) {
+		message = mRtcpHandler->outgoing(message);
+		if (!message)
+			return false;
+	}
+
+	auto direction = mMediaDescription.direction();
+	if ((direction == Description::Direction::RecvOnly ||
+	     direction == Description::Direction::Inactive) &&
+	    message->type != Message::Control) {
+		PLOG_WARNING << "Track media direction does not allow transmission, dropping";
+		return false;
+	}
+
+	if (mIsClosed)
+		throw std::runtime_error("Track is closed");
+
+	if (message->size() > maxMessageSize())
+		throw std::runtime_error("Message size exceeds limit");
+
+#if RTC_ENABLE_MEDIA
+	auto transport = mDtlsSrtpTransport.lock();
+	if (!transport)
+		throw std::runtime_error("Track transport is not open");
+
+	return transport->sendMedia(message);
+#else
+	PLOG_WARNING << "Ignoring track send (not compiled with SRTP support)";
+	return false;
+#endif
+}
+
+void Track::incoming(message_ptr message) {
+	if (!message)
+		return;
+
+	if (mRtcpHandler) {
+		message = mRtcpHandler->incoming(message);
+		if (!message)
+			return;
+	}
+
+	auto direction = mMediaDescription.direction();
+	if ((direction == Description::Direction::SendOnly ||
+	     direction == Description::Direction::Inactive) &&
+	    message->type != Message::Control) {
+		PLOG_WARNING << "Track media direction does not allow reception, dropping";
+		return;
+	}
+
+	// Tail drop if queue is full
+	if (mRecvQueue.full())
+		return;
+
+	mRecvQueue.push(message);
+	triggerAvailable(mRecvQueue.size());
+}
+
+void Track::setRtcpHandler(std::shared_ptr<RtcpHandler> handler) {
+	mRtcpHandler = std::move(handler);
+	if (mRtcpHandler) {
+		mRtcpHandler->onOutgoing([&]([[maybe_unused]] const rtc::message_ptr &message) {
+#if RTC_ENABLE_MEDIA
+			auto transport = mDtlsSrtpTransport.lock();
+			if (!transport)
+				throw std::runtime_error("Track transport is not open");
+
+			return transport->sendMedia(message);
+#else
+			PLOG_WARNING << "Ignoring track send (not compiled with SRTP support)";
+			return false;
+#endif
+		});
+	}
+}
+
+bool Track::requestKeyframe() {
+	if (mRtcpHandler)
+		return mRtcpHandler->requestKeyframe();
+	return false;
+}
+
+std::shared_ptr<RtcpHandler> Track::getRtcpHandler() { return mRtcpHandler; }
+
+} // namespace rtc

src/transport.hpp

@@ -36,23 +36,30 @@ public:
 	using state_callback = std::function<void(State state)>;
 
 	Transport(std::shared_ptr<Transport> lower = nullptr, state_callback callback = nullptr)
-	    : mLower(std::move(lower)), mStateChangeCallback(std::move(callback)) {
-	}
+	    : mLower(std::move(lower)), mStateChangeCallback(std::move(callback)) {}
 
-	virtual ~Transport() {
-		stop();
-		if (mLower)
-			mLower->onRecv(nullptr); // doing it on stop could cause a deadlock
-	}
+	virtual ~Transport() { stop(); }
+
+	virtual void start() { mStopped = false; }
 
 	virtual bool stop() {
-		return !mShutdown.exchange(true);
+		if (mStopped.exchange(true))
+			return false;
+
+		// We don't want incoming() to be called by the lower layer anymore
+		if (mLower) {
+			PLOG_VERBOSE << "Unregistering incoming callback";
+			mLower->onRecv(nullptr);
+		}
+		return true;
 	}
 
 	void registerIncoming() {
-		if (mLower)
+		if (mLower) {
+			PLOG_VERBOSE << "Registering incoming callback";
 			mLower->onRecv(std::bind(&Transport::incoming, this, _1));
 		}
+	}
 
 	void onRecv(message_callback callback) { mRecvCallback = std::move(callback); }
 	State state() const { return mState; }
@@ -60,10 +67,20 @@ public:
 	virtual bool send(message_ptr message) { return outgoing(message); }
 
 protected:
-	void recv(message_ptr message) { mRecvCallback(message); }
+	void recv(message_ptr message) {
+		try {
+			mRecvCallback(message);
+		} catch (const std::exception &e) {
+			PLOG_WARNING << e.what();
+		}
+	}
 	void changeState(State state) {
+		try {
 			if (mState.exchange(state) != state)
 				mStateChangeCallback(state);
+		} catch (const std::exception &e) {
+			PLOG_WARNING << e.what();
+		}
 	}
 
 	virtual void incoming(message_ptr message) { recv(message); }
@@ -80,7 +97,7 @@ private:
 	synchronized_callback<message_ptr> mRecvCallback;
 
 	std::atomic<State> mState = State::Disconnected;
-	std::atomic<bool> mShutdown = false;
+	std::atomic<bool> mStopped = true;
 };
 
 } // namespace rtc

src/verifiedtlstransport.cpp

@@ -0,0 +1,49 @@
+/**
+ * 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 "verifiedtlstransport.hpp"
+#include "include.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+using std::shared_ptr;
+using std::string;
+using std::unique_ptr;
+using std::weak_ptr;
+
+namespace rtc {
+
+VerifiedTlsTransport::VerifiedTlsTransport(shared_ptr<TcpTransport> lower, string host,
+                                           state_callback callback)
+    : TlsTransport(std::move(lower), std::move(host), std::move(callback)) {
+
+#if USE_GNUTLS
+	PLOG_DEBUG << "Setting up TLS certificate verification";
+	gnutls_session_set_verify_cert(mSession, mHost.c_str(), 0);
+#else
+	PLOG_DEBUG << "Setting up TLS certificate verification";
+	SSL_set_verify(mSsl, SSL_VERIFY_PEER, NULL);
+	SSL_set_verify_depth(mSsl, 4);
+#endif
+}
+
+VerifiedTlsTransport::~VerifiedTlsTransport() {}
+
+} // namespace rtc
+
+#endif

src/verifiedtlstransport.hpp

@@ -0,0 +1,38 @@
+/**
+ * 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_VERIFIED_TLS_TRANSPORT_H
+#define RTC_VERIFIED_TLS_TRANSPORT_H
+
+#include "tlstransport.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+namespace rtc {
+
+class VerifiedTlsTransport final : public TlsTransport {
+public:
+	VerifiedTlsTransport(std::shared_ptr<TcpTransport> lower, string host, state_callback callback);
+	~VerifiedTlsTransport();
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/websocket.cpp

@@ -18,11 +18,13 @@
 
 #if RTC_ENABLE_WEBSOCKET
 
-#include "include.hpp"
 #include "websocket.hpp"
+#include "include.hpp"
+#include "threadpool.hpp"
 
 #include "tcptransport.hpp"
 #include "tlstransport.hpp"
+#include "verifiedtlstransport.hpp"
 #include "wstransport.hpp"
 
 #include <regex>
@@ -33,7 +35,13 @@
 
 namespace rtc {
 
-WebSocket::WebSocket() { PLOG_VERBOSE << "Creating WebSocket"; }
+using std::shared_ptr;
+
+WebSocket::WebSocket(std::optional<Configuration> config)
+    : mConfig(config ? std::move(*config) : Configuration()),
+      mRecvQueue(RECV_QUEUE_LIMIT, message_size_func) {
+	PLOG_VERBOSE << "Creating WebSocket";
+}
 
 WebSocket::~WebSocket() {
 	PLOG_VERBOSE << "Destroying WebSocket";
@@ -43,31 +51,45 @@ WebSocket::~WebSocket() {
 WebSocket::State WebSocket::readyState() const { return mState; }
 
 void WebSocket::open(const string &url) {
+	PLOG_VERBOSE << "Opening WebSocket to URL: " << url;
+
 	if (mState != State::Closed)
-		throw std::runtime_error("WebSocket must be closed before opening");
+		throw std::logic_error("WebSocket must be closed before opening");
 
-	static const char *rs = R"(^(([^:\/?#]+):)?(//([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?)";
-	static std::regex regex(rs, std::regex::extended);
+	// Modified regex from RFC 3986, see https://tools.ietf.org/html/rfc3986#appendix-B
+	static const char *rs =
+	    R"(^(([^:.@/?#]+):)?(/{0,2}((([^:@]*)(:([^@]*))?)@)?(([^:/?#]*)(:([^/?#]*))?))?([^?#]*)(\?([^#]*))?(#(.*))?)";
 
-	std::smatch match;
-	if (!std::regex_match(url, match, regex))
-		throw std::invalid_argument("Malformed WebSocket URL: " + url);
+	static const std::regex r(rs, std::regex::extended);
 
-	mScheme = match[2];
-	if (mScheme != "ws" && mScheme != "wss")
+	std::smatch m;
+	if (!std::regex_match(url, m, r) || m[10].length() == 0)
+		throw std::invalid_argument("Invalid WebSocket URL: " + url);
+
+	mScheme = m[2];
+	if (mScheme.empty())
+		mScheme = "ws";
+	else if (mScheme != "ws" && mScheme != "wss")
 		throw std::invalid_argument("Invalid WebSocket scheme: " + mScheme);
 
-	mHost = match[4];
-	if (auto pos = mHost.find(':'); pos != string::npos) {
-		mHostname = mHost.substr(0, pos);
-		mService = mHost.substr(pos + 1);
-	} else {
-		mHostname = mHost;
+	mHostname = m[10];
+	mService = m[12];
+	if (mService.empty()) {
 		mService = mScheme == "ws" ? "80" : "443";
+		mHost = mHostname;
+	} else {
+		mHost = mHostname + ':' + mService;
 	}
 
-	mPath = match[5];
-	if (string query = match[7]; !query.empty())
+	while (!mHostname.empty() && mHostname.front() == '[')
+		mHostname.erase(mHostname.begin());
+	while (!mHostname.empty() && mHostname.back() == ']')
+		mHostname.pop_back();
+
+	mPath = m[13];
+	if (mPath.empty())
+		mPath += '/';
+	if (string query = m[15]; !query.empty())
 		mPath += "?" + query;
 
 	changeState(State::Connecting);
@@ -93,16 +115,7 @@ void WebSocket::remoteClose() {
 	}
 }
 
-bool WebSocket::send(const std::variant<binary, string> &data) {
-	return std::visit(
-	    [&](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());
-		    return outgoing(std::make_shared<Message>(b, b + d.size(), type));
-	    },
-	    data);
-}
+bool WebSocket::send(message_variant data) { return outgoing(make_message(std::move(data))); }
 
 bool WebSocket::isOpen() const { return mState == State::Open; }
 
@@ -110,19 +123,22 @@ bool WebSocket::isClosed() const { return mState == State::Closed; }
 
 size_t WebSocket::maxMessageSize() const { return DEFAULT_MAX_MESSAGE_SIZE; }
 
-std::optional<std::variant<binary, string>> WebSocket::receive() {
-	while (!mRecvQueue.empty()) {
-		auto message = *mRecvQueue.pop();
-		switch (message->type) {
-		case Message::String:
-			return std::make_optional(
-			    string(reinterpret_cast<const char *>(message->data()), message->size()));
-		case Message::Binary:
-			return std::make_optional(std::move(*message));
-		default:
-			// Ignore
-			break;
+std::optional<message_variant> WebSocket::receive() {
+	while (auto next = mRecvQueue.tryPop()) {
+		message_ptr message = *next;
+		if (message->type != Message::Control)
+			return to_variant(std::move(*message));
 	}
+	return nullopt;
+}
+
+std::optional<message_variant> WebSocket::peek() {
+	while (auto next = mRecvQueue.peek()) {
+		message_ptr message = *next;
+		if (message->type != Message::Control)
+			return to_variant(std::move(*message));
+
+		mRecvQueue.tryPop();
 	}
 	return nullopt;
 }
@@ -142,13 +158,19 @@ bool WebSocket::outgoing(message_ptr message) {
 }
 
 void WebSocket::incoming(message_ptr message) {
+	if (!message) {
+		remoteClose();
+		return;
+	}
+
 	if (message->type == Message::String || message->type == Message::Binary) {
 		mRecvQueue.push(message);
 		triggerAvailable(mRecvQueue.size());
 	}
 }
 
-std::shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
+shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
+	PLOG_VERBOSE << "Starting TCP transport";
 	using State = TcpTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
@@ -182,10 +204,11 @@ std::shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
 		std::atomic_store(&mTcpTransport, transport);
 		if (mState == WebSocket::State::Closed) {
 			mTcpTransport.reset();
-			transport->stop();
 			throw std::runtime_error("Connection is closed");
 		}
+		transport->start();
 		return transport;
+
 	} catch (const std::exception &e) {
 		PLOG_ERROR << e.what();
 		remoteClose();
@@ -193,7 +216,8 @@ std::shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
 	}
 }
 
-std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
+shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
+	PLOG_VERBOSE << "Starting TLS transport";
 	using State = TlsTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
@@ -201,8 +225,7 @@ std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 			return transport;
 
 		auto lower = std::atomic_load(&mTcpTransport);
-		auto transport = std::make_shared<TlsTransport>(
-		    lower, mHost, [this, weak_this = weak_from_this()](State state) {
+		auto stateChangeCallback = [this, weak_this = weak_from_this()](State state) {
 			auto shared_this = weak_this.lock();
 			if (!shared_this)
 				return;
@@ -221,14 +244,30 @@ std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 				// Ignore
 				break;
 			}
-		    });
+		};
+
+		shared_ptr<TlsTransport> transport;
+#ifdef _WIN32
+		if (!mConfig.disableTlsVerification) {
+			PLOG_WARNING << "TLS certificate verification with root CA is not supported on Windows";
+		}
+		transport = std::make_shared<TlsTransport>(lower, mHostname, stateChangeCallback);
+#else
+		if (mConfig.disableTlsVerification)
+			transport = std::make_shared<TlsTransport>(lower, mHostname, stateChangeCallback);
+		else
+			transport =
+			    std::make_shared<VerifiedTlsTransport>(lower, mHostname, stateChangeCallback);
+#endif
+
 		std::atomic_store(&mTlsTransport, transport);
 		if (mState == WebSocket::State::Closed) {
 			mTlsTransport.reset();
-			transport->stop();
 			throw std::runtime_error("Connection is closed");
 		}
+		transport->start();
 		return transport;
+
 	} catch (const std::exception &e) {
 		PLOG_ERROR << e.what();
 		remoteClose();
@@ -236,14 +275,15 @@ std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 	}
 }
 
-std::shared_ptr<WsTransport> WebSocket::initWsTransport() {
+shared_ptr<WsTransport> WebSocket::initWsTransport() {
+	PLOG_VERBOSE << "Starting WebSocket transport";
 	using State = WsTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
 		if (auto transport = std::atomic_load(&mWsTransport))
 			return transport;
 
-		std::shared_ptr<Transport> lower = std::atomic_load(&mTlsTransport);
+		shared_ptr<Transport> lower = std::atomic_load(&mTlsTransport);
 		if (!lower)
 			lower = std::atomic_load(&mTcpTransport);
 		auto transport = std::make_shared<WsTransport>(
@@ -275,9 +315,9 @@ std::shared_ptr<WsTransport> WebSocket::initWsTransport() {
 		std::atomic_store(&mWsTransport, transport);
 		if (mState == WebSocket::State::Closed) {
 			mWsTransport.reset();
-			transport->stop();
 			throw std::runtime_error("Connection is closed");
 		}
+		transport->start();
 		return transport;
 	} catch (const std::exception &e) {
 		PLOG_ERROR << e.what();
@@ -297,12 +337,11 @@ void WebSocket::closeTransports() {
 	// Reset callbacks now that state is changed
 	resetCallbacks();
 
-	// Pass the references to a thread, allowing to terminate a transport from its own thread
+	// Pass the pointers to a thread, allowing to terminate a transport from its own thread
 	auto ws = std::atomic_exchange(&mWsTransport, decltype(mWsTransport)(nullptr));
 	auto tls = std::atomic_exchange(&mTlsTransport, decltype(mTlsTransport)(nullptr));
 	auto tcp = std::atomic_exchange(&mTcpTransport, decltype(mTcpTransport)(nullptr));
-	if (ws || tls || tcp) {
-		std::thread t([ws, tls, tcp, token = mInitToken]() mutable {
+	ThreadPool::Instance().enqueue([ws, tls, tcp]() mutable {
 		if (ws)
 			ws->stop();
 		if (tls)
@@ -314,8 +353,6 @@ void WebSocket::closeTransports() {
 		tls.reset();
 		tcp.reset();
 	});
-		t.detach();
-	}
 }
 
 } // namespace rtc

src/wstransport.cpp

@@ -17,9 +17,9 @@
  */
 
 #include "wstransport.hpp"
+#include "base64.hpp"
 #include "tcptransport.hpp"
 #include "tlstransport.hpp"
-#include "base64.hpp"
 
 #if RTC_ENABLE_WEBSOCKET
 
@@ -50,7 +50,7 @@ using std::to_integer;
 using std::to_string;
 
 using random_bytes_engine =
-    std::independent_bits_engine<std::default_random_engine, CHAR_BIT, unsigned char>;
+    std::independent_bits_engine<std::default_random_engine, CHAR_BIT, unsigned short>;
 
 WsTransport::WsTransport(std::shared_ptr<Transport> lower, string host, string path,
                          message_callback recvCallback, state_callback stateCallback)
@@ -59,12 +59,22 @@ WsTransport::WsTransport(std::shared_ptr<Transport> lower, string host, string p
 
 	PLOG_DEBUG << "Initializing WebSocket transport";
 
-	registerIncoming();
-	sendHttpRequest();
+	if (mHost.empty())
+		throw std::invalid_argument("WebSocket HTTP host cannot be empty");
+
+	if (mPath.empty())
+		throw std::invalid_argument("WebSocket HTTP path cannot be empty");
 }
 
 WsTransport::~WsTransport() { stop(); }
 
+void WsTransport::start() {
+	Transport::start();
+
+	registerIncoming();
+	sendHttpRequest();
+}
+
 bool WsTransport::stop() {
 	if (!Transport::stop())
 		return false;
@@ -143,14 +153,15 @@ void WsTransport::close() {
 }
 
 bool WsTransport::sendHttpRequest() {
+	PLOG_DEBUG << "Sending WebSocket HTTP request for path " << mPath;
 	changeState(State::Connecting);
 
-	auto seed = system_clock::now().time_since_epoch().count();
+	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 	random_bytes_engine generator(seed);
 
 	binary key(16);
 	auto k = reinterpret_cast<uint8_t *>(key.data());
-	std::generate(k, k + key.size(), generator);
+	std::generate(k, k + key.size(), [&]() { return uint8_t(generator()); });
 
 	const string request = "GET " + mPath +
 	                       " HTTP/1.1\r\n"
@@ -283,7 +294,7 @@ size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
 		cur += 4;
 	}
 
-	if (end - cur < frame.length)
+	if (size_t(end - cur) < frame.length)
 		return 0;
 
 	frame.payload = cur;
@@ -292,7 +303,7 @@ size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
 			frame.payload[i] ^= maskingKey[i % 4];
 	cur += frame.length;
 
-	return cur - buffer;
+	return size_t(cur - buffer);
 }
 
 void WsTransport::recvFrame(const Frame &frame) {
@@ -378,13 +389,13 @@ bool WsTransport::sendFrame(const Frame &frame) {
 	}
 
 	if (frame.mask) {
-		auto seed = system_clock::now().time_since_epoch().count();
+		auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 		random_bytes_engine generator(seed);
 
 		byte *maskingKey = reinterpret_cast<byte *>(cur);
 
 		auto u = reinterpret_cast<uint8_t *>(maskingKey);
-		std::generate(u, u + 4, generator);
+		std::generate(u, u + 4, [&]() { return uint8_t(generator()); });
 		cur += 4;
 
 		for (size_t i = 0; i < frame.length; ++i)

src/wstransport.hpp

@@ -35,6 +35,7 @@ public:
 	            message_callback recvCallback, state_callback stateCallback);
 	~WsTransport();
 
+	void start() override;
 	bool stop() override;
 	bool send(message_ptr message) override;