Bumped version to 0.6.0

SRTP transport support

.clang-format

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

.editorconfig

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

.github/workflows/build-gnutls.yml

@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build:
+  build-ubuntu:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -18,7 +18,23 @@ jobs:
     - name: cmake
       run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=1
     - name: make
-      run: (cd build; make)
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: brew install gnutls nettle
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=1
+      env:
+# hack to bypass EPERM issue on sendto()
+        CFLAGS: -DJUICE_ENABLE_ADDRS_LOCALHOST
+    - name: make
+      run: (cd build; make -j2)
     - name: test
       run: ./build/tests
-

.github/workflows/build-nice.yml

@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build:
+  build-ubuntu:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -18,7 +18,7 @@ jobs:
     - name: cmake
       run: cmake -B build -DUSE_JUICE=0 -DUSE_GNUTLS=1
     - name: make
-      run: (cd build; make)
+      run: (cd build; make -j2)
     - name: test
       run: ./build/tests
 

.github/workflows/build-openssl.yml

@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build:
+  build-ubuntu:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -18,7 +18,25 @@ jobs:
     - name: cmake
       run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=0
     - name: make
-      run: (cd build; make)
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: brew reinstall openssl@1.1
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=0
+      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
-

.gitignore

@@ -1,8 +1,10 @@
 build/
+node_modules/
 *.d
 *.o
 *.a
 *.so
 compile_commands.json
 tests
+.DS_Store
 

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "deps/libjuice"]
 	path = deps/libjuice
 	url = https://github.com/paullouisageneau/libjuice
+[submodule "deps/json"]
+	path = deps/json
+	url = https://github.com/nlohmann/json.git

CMakeLists.txt

@@ -1,11 +1,12 @@
-cmake_minimum_required (VERSION 3.7)
+cmake_minimum_required(VERSION 3.7)
-project (libdatachannel
+project(libdatachannel
 	DESCRIPTION "WebRTC DataChannels Library"
-	VERSION 0.5.0
+	VERSION 0.6.0
 	LANGUAGES CXX)
 
 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)
 
 if(USE_GNUTLS)
 	option(USE_NETTLE "Use Nettle instead of OpenSSL in libjuice" ON)
@@ -30,6 +31,7 @@ set(LIBDATACHANNEL_SOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/src/configuration.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/datachannel.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/description.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/dtlssrtptransport.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/dtlstransport.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/icetransport.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/init.cpp
@@ -37,6 +39,15 @@ set(LIBDATACHANNEL_SOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/src/peerconnection.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/rtc.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/sctptransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tls.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/websocket.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/wstransport.cpp
 )
 
 set(LIBDATACHANNEL_HEADERS
@@ -55,25 +66,23 @@ 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/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/websocket.cpp
-
-set(TESTS_OFFERER_SOURCES
-    ${CMAKE_CURRENT_SOURCE_DIR}/test/p2p/offerer.cpp
-)
-
-set(TESTS_ANSWERER_SOURCES
-    ${CMAKE_CURRENT_SOURCE_DIR}/test/p2p/answerer.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)
 
 add_subdirectory(deps/usrsctp EXCLUDE_FROM_ALL)
 if (MSYS OR MINGW)
@@ -87,28 +96,41 @@ endif()
 add_library(Usrsctp::Usrsctp ALIAS usrsctp)
 add_library(Usrsctp::UsrsctpStatic ALIAS usrsctp-static)
 
-add_library(datachannel SHARED ${LIBDATACHANNEL_SOURCES})
+if (RTC_ENABLE_WEBSOCKET)
+	add_library(datachannel SHARED
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=1)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=1)
+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
 	VERSION ${PROJECT_VERSION}
 	CXX_STANDARD 17)
-
-target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
-target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/deps/plog/include)
-target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
-target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-target_link_libraries(datachannel PUBLIC Threads::Threads)
-target_link_libraries(datachannel PRIVATE Usrsctp::UsrsctpStatic)
-
-add_library(datachannel-static STATIC EXCLUDE_FROM_ALL ${LIBDATACHANNEL_SOURCES})
 set_target_properties(datachannel-static PROPERTIES
 	VERSION ${PROJECT_VERSION}
 	CXX_STANDARD 17)
 
+target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
+target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+target_link_libraries(datachannel PUBLIC Threads::Threads plog::plog)
+target_link_libraries(datachannel PRIVATE Usrsctp::UsrsctpStatic)
+
 target_include_directories(datachannel-static PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
-target_include_directories(datachannel-static PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/deps/plog/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)
+target_link_libraries(datachannel-static PUBLIC Threads::Threads plog::plog)
 target_link_libraries(datachannel-static PRIVATE Usrsctp::UsrsctpStatic)
 
 if(WIN32)
@@ -116,39 +138,56 @@ if(WIN32)
 	target_link_libraries(datachannel-static PRIVATE wsock32 ws2_32) # winsock2
 endif()
 
+if(SRTP_FOUND)
+	if(NOT TARGET SRTP::SRTP)
+		add_library(SRTP::SRTP UNKNOWN IMPORTED)
+		set_target_properties(SRTP::SRTP PROPERTIES
+			INTERFACE_INCLUDE_DIRECTORIES ${SRTP_INCLUDE_DIRS}
+			IMPORTED_LINK_INTERFACE_LANGUAGES C
+			IMPORTED_LOCATION ${SRTP_LIBRARIES})
+	endif()
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=1)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=1)
+	target_link_libraries(datachannel PRIVATE SRTP::SRTP)
+	target_link_libraries(datachannel-static PRIVATE SRTP::SRTP)
+else()
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=0)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=0)
+endif()
+
 if (USE_GNUTLS)
 	find_package(GnuTLS REQUIRED)
 	if(NOT TARGET GnuTLS::GnuTLS)
 		add_library(GnuTLS::GnuTLS UNKNOWN IMPORTED)
 		set_target_properties(GnuTLS::GnuTLS PROPERTIES
-			INTERFACE_INCLUDE_DIRECTORIES "${GNUTLS_INCLUDE_DIRS}"
+			INTERFACE_INCLUDE_DIRECTORIES ${GNUTLS_INCLUDE_DIRS}
-			INTERFACE_COMPILE_DEFINITIONS "${GNUTLS_DEFINITIONS}"
+			INTERFACE_COMPILE_DEFINITIONS ${GNUTLS_DEFINITIONS}
-			IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+			IMPORTED_LINK_INTERFACE_LANGUAGES C
-			IMPORTED_LOCATION "${GNUTLS_LIBRARIES}")
+			IMPORTED_LOCATION ${GNUTLS_LIBRARIES})
 	endif()
 	target_compile_definitions(datachannel PRIVATE USE_GNUTLS=1)
-	target_link_libraries(datachannel PRIVATE GnuTLS::GnuTLS)
 	target_compile_definitions(datachannel-static PRIVATE USE_GNUTLS=1)
+	target_link_libraries(datachannel PRIVATE GnuTLS::GnuTLS)
 	target_link_libraries(datachannel-static PRIVATE GnuTLS::GnuTLS)
 else()
 	find_package(OpenSSL REQUIRED)
 	target_compile_definitions(datachannel PRIVATE USE_GNUTLS=0)
-	target_link_libraries(datachannel PRIVATE OpenSSL::SSL)
 	target_compile_definitions(datachannel-static PRIVATE USE_GNUTLS=0)
+	target_link_libraries(datachannel PRIVATE OpenSSL::SSL)
 	target_link_libraries(datachannel-static PRIVATE OpenSSL::SSL)
 endif()
 
 if (USE_JUICE)
 	add_subdirectory(deps/libjuice EXCLUDE_FROM_ALL)
 	target_compile_definitions(datachannel PRIVATE USE_JUICE=1)
-	target_link_libraries(datachannel PRIVATE LibJuice::LibJuiceStatic)
 	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()
 	find_package(LibNice REQUIRED)
 	target_compile_definitions(datachannel PRIVATE USE_JUICE=0)
-	target_link_libraries(datachannel PRIVATE LibNice::LibNice)
 	target_compile_definitions(datachannel-static PRIVATE USE_JUICE=0)
+	target_link_libraries(datachannel PRIVATE LibNice::LibNice)
 	target_link_libraries(datachannel-static PRIVATE LibNice::LibNice)
 endif()
 
@@ -158,28 +197,19 @@ add_library(LibDataChannel::LibDataChannelStatic ALIAS datachannel-static)
 install(TARGETS datachannel LIBRARY DESTINATION lib)
 install(FILES ${LIBDATACHANNEL_HEADERS} DESTINATION include/rtc)
 
-# Main Test
+# 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)
+target_link_libraries(datachannel-tests datachannel nlohmann_json::nlohmann_json)
 
-# P2P Test: offerer
+# Examples
-add_executable(datachannel-offerer ${TESTS_OFFERER_SOURCES})
+set(JSON_BuildTests OFF CACHE INTERNAL "")
-set_target_properties(datachannel-offerer PROPERTIES
+add_subdirectory(deps/json)
-	VERSION ${PROJECT_VERSION}
+add_subdirectory(examples/client)
-	CXX_STANDARD 17)
+add_subdirectory(examples/copy-paste)
-set_target_properties(datachannel-offerer PROPERTIES OUTPUT_NAME offerer)
+add_subdirectory(examples/copy-paste-capi)
-target_link_libraries(datachannel-offerer datachannel)
-
-# P2P Test: answerer
-add_executable(datachannel-answerer ${TESTS_ANSWERER_SOURCES})
-set_target_properties(datachannel-answerer PROPERTIES
-	VERSION ${PROJECT_VERSION}
-	CXX_STANDARD 17)
-set_target_properties(datachannel-answerer PROPERTIES OUTPUT_NAME answerer)
-target_link_libraries(datachannel-answerer datachannel)
 

Jamfile

@@ -10,6 +10,8 @@ lib libdatachannel
 	<cxxstd>17
 	<include>./include/rtc
 	<define>USE_JUICE=1
+	<define>RTC_ENABLE_MEDIA=0
+	<define>RTC_ENABLE_WEBSOCKET=0
 	<library>/libdatachannel//usrsctp
 	<library>/libdatachannel//juice
 	<library>/libdatachannel//plog
@@ -19,12 +21,14 @@ lib libdatachannel
 	<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"
 	;
 
-feature crypto : openssl gnutls : composite propagated ;
+feature gnutls : off on : composite propagated ;
-feature.compose <crypto>openssl
+feature.compose <gnutls>off
     : <define>USE_GNUTLS=0 ;
-feature.compose <crypto>gnutls
+feature.compose <gnutls>on
     : <define>USE_GNUTLS=1 ;
 
 alias plog

Makefile

@@ -38,6 +38,22 @@ else
         LIBS+=glib-2.0 gobject-2.0 nice
 endif
 
+RTC_ENABLE_MEDIA ?= 0
+ifneq ($(RTC_ENABLE_MEDIA), 0)
+        CPPFLAGS+=-DRTC_ENABLE_MEDIA=1
+        LIBS+=srtp
+else
+        CPPFLAGS+=-DRTC_ENABLE_MEDIA=0
+endif
+
+RTC_ENABLE_WEBSOCKET ?= 1
+ifneq ($(RTC_ENABLE_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

@@ -1,16 +1,46 @@
-# libdatachannel - C/C++ WebRTC DataChannels
+# libdatachannel - C/C++ WebRTC Data Channels
 
-libdatachannel is a standalone implementation of WebRTC DataChannels in C++17 with C bindings for POSIX platforms 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 API, in order to ease the design of cross-environment applications.
+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.
+
+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 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.
 
-The connectivity 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). The security layer can be provided through [GnuTLS](https://www.gnutls.org/) or [OpenSSL](https://www.openssl.org/).
-
 Licensed under LGPLv2, see [LICENSE](https://github.com/paullouisageneau/libdatachannel/blob/master/LICENSE).
 
 ## Compatibility
 
-The library aims at fully implementing WebRTC SCTP DataChannels ([draft-ietf-rtcweb-data-channel-13](https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-13)) over DTLS/UDP ([RFC7350](https://tools.ietf.org/html/rfc7350) and [RFC8261](https://tools.ietf.org/html/rfc8261)) with ICE ([RFC8445](https://tools.ietf.org/html/rfc8445)). It has been tested to be compatible with Firefox and Chromium. It supports IPv6 and Multicast DNS candidates resolution ([draft-ietf-rtcweb-mdns-ice-candidates-03](https://tools.ietf.org/html/draft-ietf-rtcweb-mdns-ice-candidates-03)) provided the operating system also supports it.
+The library aims at implementing the following communication protocols:
+
+### WebRTC Data Channel
+
+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))
+- 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))
+- 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)
+
+### WebSocket
+
+WebSocket is the protocol of choice for WebRTC signaling. The support is optional and can be disabled at compile time.
+
+Protocol stack:
+- WebSocket protocol ([RFC6455](https://tools.ietf.org/html/rfc6455)), client-side only
+- HTTP over TLS ([RFC2818](https://tools.ietf.org/html/rfc2818))
+
+Features:
+- IPv6 and IPv4/IPv6 dual-stack support
+- Keepalive with ping/pong
 
 ## Dependencies
 
@@ -18,10 +48,11 @@ The library aims at fully implementing WebRTC SCTP DataChannels ([draft-ietf-rtc
 
 Optional:
 - libnice: https://nice.freedesktop.org/ (substituable with libjuice)
+- libSRTP: https://github.com/cisco/libsrtp
 
 Submodules:
-- usrsctp: https://github.com/sctplab/usrsctp
 - libjuice: https://github.com/paullouisageneau/libjuice
+- usrsctp: https://github.com/sctplab/usrsctp
 
 ## Building
 ### Building with CMake (preferred)
@@ -41,9 +72,11 @@ $ git submodule update --init --recursive
 $ make USE_JUICE=1 USE_GNUTLS=1
 ```
 
-## Example
+## Examples
 
-In the following example, note the callbacks are called in another thread.
+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).
 
 ### Signal a PeerConnection
 
@@ -93,9 +126,11 @@ pc->onGatheringStateChange([](PeerConnection::GatheringState state) {
 
 ```cpp
 auto dc = pc->createDataChannel("test");
+
 dc->onOpen([]() {
     cout << "Open" << endl;
 });
+
 dc->onMessage([](const variant<binary, string> &message) {
     if (holds_alternative<string>(message)) {
         cout << "Received: " << get<string>(message) << endl;
@@ -114,7 +149,22 @@ pc->onDataChannel([&dc](shared_ptr<rtc::DataChannel> incoming) {
 
 ```
 
-See [test/connectivity.cpp](https://github.com/paullouisageneau/libdatachannel/blob/master/test/connectivity.cpp) for a complete local connection example.
+### Open a WebSocket
 
-See [test/cpai.cpp](https://github.com/paullouisageneau/libdatachannel/blob/master/test/capi.cpp) for a C API example.
+```cpp
+auto ws = make_shared<rtc::WebSocket>();
+
+ws->onOpen([]() {
+	cout << "WebSocket open" << endl;
+});
+
+ws->onMessage([](const variant<binary, string> &message) {
+    if (holds_alternative<string>(message)) {
+        cout << "WebSocket received: " << get<string>(message) << endl;
+    }
+});
+
+ws->open("wss://my.websocket/service");
+
+```
 

cmake/Modules/FindSRTP.cmake

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

examples/README.md

@@ -0,0 +1,12 @@
+# Examples for libdatachannel
+
+This directory contains different WebRTC clients and 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
+
+Additionally, it contains two debugging tools for libdatachannel with copy-pasting as signaling:
+- [copy-paste](copy-paste) using the C++ API
+- [copy-paste-capi](copy-paste-capi) using the C API
+

examples/client/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.7)
+if(POLICY CMP0079)
+	cmake_policy(SET CMP0079 NEW)
+endif()
+
+add_executable(datachannel-client main.cpp)
+set_target_properties(datachannel-client PROPERTIES
+	CXX_STANDARD 17
+	OUTPUT_NAME client)
+target_link_libraries(datachannel-client datachannel nlohmann_json)
+

examples/client/LICENSE

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+Public License instead of this License.

examples/client/main.cpp

@@ -0,0 +1,218 @@
+/*
+ * libdatachannel client example
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
+ * Copyright (c) 2019 Murat Dogan
+ * Copyright (c) 2020 Will Munn
+ * Copyright (c) 2020 Nico Chatzi
+ * Copyright (c) 2020 Lara Mackey
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "rtc/rtc.hpp"
+
+#include <nlohmann/json.hpp>
+
+#include <algorithm>
+#include <iostream>
+#include <memory>
+#include <random>
+#include <thread>
+#include <unordered_map>
+
+using namespace rtc;
+using namespace std;
+using namespace std::chrono_literals;
+
+using json = nlohmann::json;
+
+template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
+
+unordered_map<string, shared_ptr<PeerConnection>> peerConnectionMap;
+unordered_map<string, shared_ptr<DataChannel>> dataChannelMap;
+
+string localId;
+
+shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
+                                                weak_ptr<WebSocket> wws, string id);
+string randomId(size_t length);
+
+int main(int argc, char **argv) {
+	rtc::InitLogger(LogLevel::Warning);
+
+	Configuration config;
+	config.iceServers.emplace_back("stun:stun.l.google.com:19302"); // change to your STUN server
+
+	localId = randomId(4);
+	cout << "The local ID is: " << localId << endl;
+
+	auto ws = make_shared<WebSocket>();
+
+	ws->onOpen([]() { cout << "WebSocket connected, signaling ready" << endl; });
+
+	ws->onClosed([]() { cout << "WebSocket closed" << endl; });
+
+	ws->onError([](const string &error) { cout << "WebSocket failed: " << error << endl; });
+
+	ws->onMessage([&](const variant<binary, string> &data) {
+		if (!holds_alternative<string>(data))
+			return;
+
+		json message = json::parse(get<string>(data));
+
+		auto it = message.find("id");
+		if (it == message.end())
+			return;
+		string id = it->get<string>();
+
+		it = message.find("type");
+		if (it == message.end())
+			return;
+		string type = it->get<string>();
+
+		shared_ptr<PeerConnection> pc;
+		if (auto jt = peerConnectionMap.find(id); jt != peerConnectionMap.end()) {
+			pc = jt->second;
+		} else if (type == "offer") {
+			cout << "Answering to " + id << endl;
+			pc = createPeerConnection(config, ws, id);
+		} else {
+			return;
+		}
+
+		if (type == "offer" || type == "answer") {
+			auto sdp = message["description"].get<string>();
+			pc->setRemoteDescription(Description(sdp, type));
+		} else if (type == "candidate") {
+			auto sdp = message["candidate"].get<string>();
+			auto mid = message["mid"].get<string>();
+			pc->addRemoteCandidate(Candidate(sdp, mid));
+		}
+	});
+
+	const string url = "ws://localhost:8000/" + localId;
+	ws->open(url);
+
+	cout << "Waiting for signaling to be connected..." << endl;
+	while (!ws->isOpen()) {
+		if (ws->isClosed())
+			return 1;
+		this_thread::sleep_for(100ms);
+	}
+
+	while (true) {
+		string id;
+		cout << "Enter a remote ID to send an offer:" << endl;
+		cin >> id;
+		cin.ignore();
+		if (id.empty())
+			break;
+		if (id == localId)
+			continue;
+
+		cout << "Offering to " + id << endl;
+		auto pc = createPeerConnection(config, ws, id);
+
+		// We are the offerer, so create a data channel to initiate the process
+		const string label = "test";
+		cout << "Creating DataChannel with label \"" << label << "\"" << endl;
+		auto dc = pc->createDataChannel(label);
+
+		dc->onOpen([id, wdc = make_weak_ptr(dc)]() {
+			cout << "DataChannel from " << id << " open" << endl;
+			if (auto dc = wdc.lock())
+				dc->send("Hello from " + localId);
+		});
+
+		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
+
+		dc->onMessage([id](const variant<binary, string> &message) {
+			if (!holds_alternative<string>(message))
+				return;
+
+			cout << "Message from " << id << " received: " << get<string>(message) << endl;
+		});
+
+		dataChannelMap.emplace(id, dc);
+
+		this_thread::sleep_for(1s);
+	}
+
+	cout << "Cleaning up..." << endl;
+
+	dataChannelMap.clear();
+	peerConnectionMap.clear();
+	return 0;
+}
+
+// Create and setup a PeerConnection
+shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
+                                                weak_ptr<WebSocket> wws, string id) {
+	auto pc = make_shared<PeerConnection>(config);
+
+	pc->onStateChange([](PeerConnection::State state) { cout << "State: " << state << endl; });
+
+	pc->onGatheringStateChange(
+	    [](PeerConnection::GatheringState state) { cout << "Gathering State: " << state << endl; });
+
+	pc->onLocalDescription([wws, id](const Description &description) {
+		json message = {
+		    {"id", id}, {"type", description.typeString()}, {"description", string(description)}};
+
+		if (auto ws = wws.lock())
+			ws->send(message.dump());
+	});
+
+	pc->onLocalCandidate([wws, id](const Candidate &candidate) {
+		json message = {{"id", id},
+		                {"type", "candidate"},
+		                {"candidate", string(candidate)},
+		                {"mid", candidate.mid()}};
+
+		if (auto ws = wws.lock())
+			ws->send(message.dump());
+	});
+
+	pc->onDataChannel([id](shared_ptr<DataChannel> dc) {
+		cout << "DataChannel from " << id << " received with label \"" << dc->label() << "\""
+		     << endl;
+
+		dc->onClosed([id]() { cout << "DataChannel from " << id << " closed" << endl; });
+
+		dc->onMessage([id](const variant<binary, string> &message) {
+			if (!holds_alternative<string>(message))
+				return;
+
+			cout << "Message from " << id << " received: " << get<string>(message) << endl;
+		});
+
+		dc->send("Hello from " + localId);
+
+		dataChannelMap.emplace(id, dc);
+	});
+
+	peerConnectionMap.emplace(id, pc);
+	return pc;
+};
+
+// Helper function to generate a random ID
+string randomId(size_t length) {
+	static const string characters(
+	    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
+	string id(length, '0');
+	default_random_engine rng(random_device{}());
+	uniform_int_distribution<int> dist(0, characters.size() - 1);
+	generate(id.begin(), id.end(), [&]() { return characters.at(dist(rng)); });
+	return id;
+}

examples/copy-paste-capi/CMakeLists.txt

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

examples/copy-paste/CMakeLists.txt

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

examples/copy-paste/answerer.cpp

@@ -29,7 +29,7 @@ using namespace std;
 template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
 
 int main(int argc, char **argv) {
-	InitLogger(LogLevel::Warning);
+	rtc::InitLogger(LogLevel::Warning);
 
 	Configuration config;
 	// config.iceServers.emplace_back("stun.l.google.com:19302");

examples/copy-paste/offerer.cpp

@@ -29,7 +29,7 @@ using namespace std;
 template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
 
 int main(int argc, char **argv) {
-	InitLogger(LogLevel::Warning);
+	rtc::InitLogger(LogLevel::Warning);
 
 	Configuration config;
 	// config.iceServers.emplace_back("stun.l.google.com:19302");

examples/signaling-server-python/LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
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+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
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+supports such interaction) an opportunity to receive the Corresponding
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+
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+    Copyright (C) <year>  <name of author>
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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-python/signaling-server.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+#
+# Signaling server example for libdatachannel
+# Copyright (c) 2020 Paul-Louis Ageneau
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import ssl
+import json
+import asyncio
+import logging
+import websockets
+
+
+logger = logging.getLogger('websockets')
+logger.setLevel(logging.INFO)
+logger.addHandler(logging.StreamHandler(sys.stdout))
+
+clients = {}
+
+
+async def handle_websocket(websocket, path):
+    client_id = None
+    try:
+        splitted = path.split('/')
+        splitted.pop(0)
+        client_id = splitted.pop(0)
+        print('Client {} connected'.format(client_id))
+
+        clients[client_id] = websocket
+        while True:
+            data = await websocket.recv()
+            print('Client {} << {}'.format(client_id, data))
+            message = json.loads(data)
+            destination_id = message['id']
+            destination_websocket = clients.get(destination_id)
+            if destination_websocket:
+                message['id'] = client_id
+                data = json.dumps(message)
+                print('Client {} >> {}'.format(destination_id, data))
+                await destination_websocket.send(data)
+            else:
+                print('Client {} not found'.format(destination_id))
+
+    except Exception as e:
+        print(e)
+
+    finally:
+        if client_id:
+            del clients[client_id]
+            print('Client {} disconnected'.format(client_id))
+
+if __name__ == '__main__':
+    port = int(sys.argv[1]) if len(sys.argv) > 1 else 8000
+    ssl_cert = sys.argv[2] if len(sys.argv) > 2 else None
+
+    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)
+    asyncio.get_event_loop().run_until_complete(start_server)
+    asyncio.get_event_loop().run_forever()

examples/signaling-server-rust/.gitignore

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examples/signaling-server-rust/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "webrtc_server"
+version = "0.1.0"
+authors = ["Nico Chatzi <nico.chatzigianis@focusrite.com>"]
+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"
+
+[dependencies.rocket_contrib]
+version = "0.4.4"
+default-features = false
+features = ["json"]

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

@@ -0,0 +1,147 @@
+#![feature(proc_macro_hygiene, decl_macro)]
+
+#[macro_use]
+extern crate rocket;
+extern crate rocket_cors;
+#[macro_use]
+extern crate rocket_contrib;
+#[macro_use]
+extern crate serde_derive;
+
+extern crate bincode;
+
+use std::sync::Mutex;
+
+use rocket_contrib::json::{Json, JsonValue};
+
+use rocket::http::Method; // 1.
+
+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(),
+        };
+        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 mut res = client
+            .get("/state/json")
+            .header(ContentType::JSON)
+            .dispatch();
+        assert_eq!(res.status(), Status::Ok);
+
+        let body = res.body().unwrap().into_string().unwrap();
+        println!("{}", body);
+    }
+}

examples/web/LICENSE

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
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+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
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+your programs, too.
+
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+
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+a notice placed by the copyright holder saying it may be distributed
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+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
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+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
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+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
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+  2. You may modify your copy or copies of the Program or any portion
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+distribute such modifications or work under the terms of Section 1
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+exercise the right to control the distribution of derivative or
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+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
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+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
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+                     END OF TERMS AND CONDITIONS
+
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+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
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+    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.
+
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+    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.
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+    with this program; if not, write to the Free Software Foundation, Inc.,
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+
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+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

examples/web/index.html

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

examples/web/package-lock.json

@@ -0,0 +1,119 @@
+{
+  "name": "libdatachannel-example-web",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "d": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/d/-/d-1.0.1.tgz",
+      "integrity": "sha512-m62ShEObQ39CfralilEQRjH6oAMtNCV1xJyEx5LpRYUVN+EviphDgUc/F3hnYbADmkiNs67Y+3ylmlG7Lnu+FA==",
+      "requires": {
+        "es5-ext": "^0.10.50",
+        "type": "^1.0.1"
+      }
+    },
+    "debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "es5-ext": {
+      "version": "0.10.53",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.53.tgz",
+      "integrity": "sha512-Xs2Stw6NiNHWypzRTY1MtaG/uJlwCk8kH81920ma8mvN8Xq1gsfhZvpkImLQArw8AHnv8MT2I45J3c0R8slE+Q==",
+      "requires": {
+        "es6-iterator": "~2.0.3",
+        "es6-symbol": "~3.1.3",
+        "next-tick": "~1.0.0"
+      }
+    },
+    "es6-iterator": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
+      "integrity": "sha1-p96IkUGgWpSwhUQDstCg+/qY87c=",
+      "requires": {
+        "d": "1",
+        "es5-ext": "^0.10.35",
+        "es6-symbol": "^3.1.1"
+      }
+    },
+    "es6-symbol": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.3.tgz",
+      "integrity": "sha512-NJ6Yn3FuDinBaBRWl/q5X/s4koRHBrgKAu+yGI6JCBeiu3qrcbJhwT2GeR/EXVfylRk8dpQVJoLEFhK+Mu31NA==",
+      "requires": {
+        "d": "^1.0.1",
+        "ext": "^1.1.2"
+      }
+    },
+    "ext": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/ext/-/ext-1.4.0.tgz",
+      "integrity": "sha512-Key5NIsUxdqKg3vIsdw9dSuXpPCQ297y6wBjL30edxwPgt2E44WcWBZey/ZvUc6sERLTxKdyCu4gZFmUbk1Q7A==",
+      "requires": {
+        "type": "^2.0.0"
+      },
+      "dependencies": {
+        "type": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/type/-/type-2.0.0.tgz",
+          "integrity": "sha512-KBt58xCHry4Cejnc2ISQAF7QY+ORngsWfxezO68+12hKV6lQY8P/psIkcbjeHWn7MqcgciWJyCCevFMJdIXpow=="
+        }
+      }
+    },
+    "is-typedarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz",
+      "integrity": "sha1-5HnICFjfDBsR3dppQPlgEfzaSpo="
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+    },
+    "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="
+    },
+    "type": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/type/-/type-1.2.0.tgz",
+      "integrity": "sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg=="
+    },
+    "typedarray-to-buffer": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
+      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+      "requires": {
+        "is-typedarray": "^1.0.0"
+      }
+    },
+    "websocket": {
+      "version": "1.0.31",
+      "resolved": "https://registry.npmjs.org/websocket/-/websocket-1.0.31.tgz",
+      "integrity": "sha512-VAouplvGKPiKFDTeCCO65vYHsyay8DqoBSlzIO3fayrfOgU94lQN5a1uWVnFrMLceTJw/+fQXR5PGbUVRaHshQ==",
+      "requires": {
+        "debug": "^2.2.0",
+        "es5-ext": "^0.10.50",
+        "nan": "^2.14.0",
+        "typedarray-to-buffer": "^3.1.5",
+        "yaeti": "^0.0.6"
+      }
+    },
+    "yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
+    }
+  }
+}

examples/web/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "libdatachannel-example-web",
+  "version": "0.0.1",
+  "description": "Example for libdatachannel",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/paullouisageneau/libdatachannel.git"
+  },
+  "author": "Paul-Louis Ageneau",
+  "license": "GPL-2.0",
+  "bugs": {
+    "url": "https://github.com/paullouisageneau/libdatachannel/issues"
+  },
+  "homepage": "https://github.com/paullouisageneau/libdatachannel#readme",
+  "dependencies": {
+    "websocket": "^1.0.31"
+  }
+}

examples/web/script.js

@@ -0,0 +1,194 @@
+/*
+ * libdatachannel example web client
+ * Copyright (C) 2020 Lara Mackey
+ * Copyright (C) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+window.addEventListener('load', () => {
+
+const config = {
+  iceServers: [{
+    urls: 'stun:stun.l.google.com:19302', // change to your STUN server
+  }],
+};
+
+const localId = randomId(4);
+
+const url = `ws://localhost:8000/${localId}`;
+
+const peerConnectionMap = {};
+const dataChannelMap = {};
+
+const offerId = document.getElementById('offerId');
+const offerBtn = document.getElementById('offerBtn');
+const sendMsg = document.getElementById('sendMsg');
+const sendBtn = document.getElementById('sendBtn');
+const _localId = document.getElementById('localId');
+_localId.textContent = localId;
+
+console.log('Connecting to signaling...');
+openSignaling(url)
+  .then((ws) => {
+    console.log('WebSocket connected, signaling ready');
+    offerId.disabled = false;
+    offerBtn.disabled = false;
+    offerBtn.onclick = () => offerPeerConnection(ws, offerId.value);
+  })
+  .catch((err) => console.error(err));
+
+
+function openSignaling(url) {
+  return new Promise((resolve, reject) => {
+    const ws = new WebSocket(url);
+    ws.onopen = () => resolve(ws);
+    ws.onerror = () => reject(new Error('WebSocket error'));
+    ws.onclosed = () => console.error('WebSocket disconnected');
+    ws.onmessage = (e) => {
+      if(typeof(e.data) != 'string') return;
+      const message = JSON.parse(e.data);
+      const { id, type } = message;
+
+      let pc = peerConnectionMap[id];
+      if(!pc) {
+		    if(type != 'offer') return;
+
+			  // Create PeerConnection for answer
+			  console.log(`Answering to ${id}`);
+			  pc = createPeerConnection(ws, id);
+		  }
+
+      switch(type) {
+      case 'offer':
+      case 'answer':
+			  pc.setRemoteDescription({
+			    sdp: message.description,
+			    type: message.type,
+			  })
+			  .then(() => {
+          if(type == 'offer') {
+			      // Send answer
+            sendLocalDescription(ws, id, pc, 'answer');
+          }
+			  });
+			  break;
+
+			case 'candidate':
+		    pc.addIceCandidate({
+          candidate: message.candidate,
+          sdpMid: message.mid,
+		    });
+		    break;
+		  }
+    }
+  });
+}
+
+function offerPeerConnection(ws, id) {
+	// Create PeerConnection
+	console.log(`Offering to ${id}`);
+	pc = createPeerConnection(ws, id);
+
+  // Create DataChannel
+  const label = "test";
+  console.log(`Creating DataChannel with label "${label}"`);
+  const dc = pc.createDataChannel(label);
+  setupDataChannel(dc, id);
+
+  // Send offer
+  sendLocalDescription(ws, id, pc, 'offer');
+}
+
+// Create and setup a PeerConnection
+function createPeerConnection(ws, id) {
+  const pc = new RTCPeerConnection(config);
+  pc.onconnectionstatechange = () => console.log(`Connection state: ${pc.connectionState}`);
+  pc.onicegatheringstatechange = () => console.log(`Gathering state: ${pc.iceGatheringState}`);
+  pc.onicecandidate = (e) => {
+    if (e.candidate) {
+      // Send candidate
+      sendLocalCandidate(ws, id, e.candidate);
+    }
+  };
+  pc.ondatachannel = (e) => {
+    const dc = e.channel;
+    console.log(`"DataChannel from ${id} received with label "${dc.label}"`);
+    setupDataChannel(dc, id);
+
+		dc.send(`Hello from ${localId}`);
+
+    sendMsg.disabled = false;
+    sendBtn.disabled = false;
+    sendBtn.onclick = () => dc.send(sendMsg.value);
+  };
+
+  peerConnectionMap[id] = pc;
+  return pc;
+}
+
+// Setup a DataChannel
+function setupDataChannel(dc, id) {
+  dc.onopen = () => {
+    console.log(`DataChannel from ${id} open`);
+
+    sendMsg.disabled = false;
+    sendBtn.disabled = false;
+    sendBtn.onclick = () => dc.send(sendMsg.value);
+  };
+  dc.onclose = () => {
+    console.log(`DataChannel from ${id} closed`);
+  };
+	dc.onmessage = (e) => {
+    if(typeof(e.data) != 'string') return;
+		console.log(`Message from ${id} received: ${e.data}`);
+    document.body.appendChild(document.createTextNode(e.data));
+	};
+
+  dataChannelMap[id] = dc;
+  return dc;
+}
+
+function sendLocalDescription(ws, id, pc, type) {
+  (type == 'offer' ? pc.createOffer() : pc.createAnswer())
+    .then((desc) => pc.setLocalDescription(desc))
+    .then(() => {
+      const { sdp, type } = pc.localDescription;
+      ws.send(JSON.stringify({
+        id,
+        type,
+        description: sdp,
+      }));
+    });
+}
+
+function sendLocalCandidate(ws, id, cand) {
+  const {candidate, sdpMid} = cand;
+  ws.send(JSON.stringify({
+    id,
+    type: 'candidate',
+    candidate,
+    mid: sdpMid,
+  }));
+}
+
+// Helper function to generate a random ID
+function randomId(length) {
+  const characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+  const pickRandom = () => characters.charAt(Math.floor(Math.random() * characters.length));
+  return [...Array(length)].map(pickRandom).join('');
+}
+
+});
+

examples/web/server.js

@@ -0,0 +1,102 @@
+/*
+ * libdatachannel example web server
+ * Copyright (C) 2020 Lara Mackey
+ * Copyright (C) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+const fs = require('fs');
+const http = require('http');
+const websocket = require('websocket');
+
+const staticFiles = {
+  '/index.html': 'text/html',
+  '/style.css': 'text/css',
+  '/script.js': 'text/javascript',
+};
+
+const clients = {};
+
+const httpServer = http.createServer((req, res) => {
+  console.log(`${req.method.toUpperCase()} ${req.url}`);
+
+  const respond = (code, data, contentType = 'text/plain') => {
+    res.writeHead(code, {
+      'Content-Type': contentType,
+      'Access-Control-Allow-Origin': '*',
+    });
+    res.end(data);
+  };
+
+  if(req.method != 'GET') {
+    respond(405, 'Method not allowed');
+    return;
+  }
+
+  const url = req.url == '/' ? '/index.html' : req.url;
+  const contentType = staticFiles[url];
+  if(!contentType) {
+    respond(404, 'Not found');
+    return;
+  }
+
+  fs.readFile(__dirname + url, (err, data) => {
+    if(err) {
+      respond(500, 'Missing file');
+      return;
+    }
+
+    respond(200, data, contentType);
+  });
+});
+
+const wsServer = new websocket.server({ httpServer });
+wsServer.on('request', (req) => {
+  console.log(`WS  ${req.resource}`);
+
+  const { path } = req.resourceURL;
+  const splitted = path.split('/');
+  splitted.shift();
+  const id = splitted[0];
+
+  const conn = req.accept(null, req.origin);
+  conn.on('message', (data) => {
+    if(data.type === 'utf8') {
+      console.log(`Client ${id} << ${data.utf8Data}`);
+
+      const message = JSON.parse(data.utf8Data);
+      const destId = message.id;
+      const dest = clients[destId];
+      if(dest) {
+        message.id = id;
+        const data = JSON.stringify(message);
+        console.log(`Client ${destId} >> ${data}`);
+        dest.send(data);
+      }
+      else {
+        console.error(`Client ${destId} not found`);
+      }
+    }
+  });
+  conn.on('close', () => {
+    delete clients[id];
+    console.error(`Client ${id} disconnected`);
+  });
+
+  clients[id] = conn;
+});
+
+httpServer.listen(8000);
+

examples/web/style.css

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

include/rtc/channel.hpp

@@ -29,6 +29,9 @@ namespace rtc {
 
 class Channel {
 public:
+	Channel() = default;
+	virtual ~Channel() = default;
+
 	virtual void close() = 0;
 	virtual bool send(const std::variant<binary, string> &data) = 0; // returns false if buffered
 

include/rtc/datachannel.hpp

@@ -36,7 +36,7 @@ namespace rtc {
 class SctpTransport;
 class PeerConnection;
 
-class DataChannel : public std::enable_shared_from_this<DataChannel>, public Channel {
+class DataChannel final : 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);
@@ -66,7 +66,7 @@ public:
 private:
 	void remoteClose();
 	void open(std::shared_ptr<SctpTransport> transport);
-	bool outgoing(mutable_message_ptr message);
+	bool outgoing(message_ptr message);
 	void incoming(message_ptr message);
 	void processOpenMessage(message_ptr message);
 
@@ -82,7 +82,6 @@ private:
 	std::atomic<bool> mIsClosed = false;
 
 	Queue<message_ptr> mRecvQueue;
-	std::atomic<size_t> mRecvAmount = 0;
 
 	friend class PeerConnection;
 };

include/rtc/description.hpp

@@ -42,11 +42,11 @@ public:
 	string typeString() const;
 	Role role() const;
 	string roleString() const;
-	string mid() const;
+	string dataMid() const;
 	std::optional<string> fingerprint() const;
 	std::optional<uint16_t> sctpPort() const;
 	std::optional<size_t> maxMessageSize() const;
-	bool trickleEnabled() const;
+	bool ended() const;
 
 	void hintType(Type type);
 	void setFingerprint(string fingerprint);
@@ -57,21 +57,40 @@ public:
 	void endCandidates();
 	std::vector<Candidate> extractCandidates();
 
-	operator string() const;
+	bool hasMedia() const;
+	void addMedia(const Description &source);
 
+	operator string() const;
 	string generateSdp(const string &eol) const;
 
 private:
 	Type mType;
 	Role mRole;
 	string mSessionId;
-	string mMid;
 	string mIceUfrag, mIcePwd;
 	std::optional<string> mFingerprint;
-	std::optional<uint16_t> mSctpPort;
+
-	std::optional<size_t> mMaxMessageSize;
+	// Data
+	struct Data {
+		string mid;
+		std::optional<uint16_t> sctpPort;
+		std::optional<size_t> maxMessageSize;
+	};
+	Data mData;
+
+	// Media (non-data)
+	struct Media {
+		Media(const string &mline);
+		string type;
+		string description;
+		string mid;
+		std::vector<string> attributes;
+	};
+	std::map<string, Media> mMedia; // by mid
+
+	// Candidates
 	std::vector<Candidate> mCandidates;
-	bool mTrickle;
+	bool mEnded = false;
 
 	static Type stringToType(const string &typeString);
 	static string typeToString(Type type);

include/rtc/include.hpp

@@ -19,6 +19,14 @@
 #ifndef RTC_INCLUDE_H
 #define RTC_INCLUDE_H
 
+#ifndef RTC_ENABLE_MEDIA
+#define RTC_ENABLE_MEDIA 1
+#endif
+
+#ifndef RTC_ENABLE_WEBSOCKET
+#define RTC_ENABLE_WEBSOCKET 1
+#endif
+
 #ifdef _WIN32
 #ifndef _WIN32_WINNT
 #define _WIN32_WINNT 0x0602
@@ -56,14 +64,25 @@ 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
 
-
+// overloaded helper
 template <class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
 template <class... Ts> overloaded(Ts...)->overloaded<Ts...>;
 
+// weak_ptr bind helper
+template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t, Args &&... _args) {
+	return [bound = std::bind(f, t, _args...), weak_this = t->weak_from_this()](auto &&... args) {
+		using result_type = typename decltype(bound)::result_type;
+		if (auto shared_this = weak_this.lock())
+			return bound(args...);
+		else
+			return static_cast<result_type>(false);
+	};
+}
+
 template <typename... P> class synchronized_callback {
 public:
 	synchronized_callback() = default;
-	synchronized_callback(std::function<void(P...)> func) { *this = std::move(func); };
+	synchronized_callback(std::function<void(P...)> func) { *this = std::move(func); }
 	~synchronized_callback() { *this = nullptr; }
 
 	synchronized_callback &operator=(std::function<void(P...)> func) {

include/rtc/log.hpp

@@ -19,8 +19,22 @@
 #ifndef RTC_LOG_H
 #define RTC_LOG_H
 
+// Disable warnings before including plog
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wall"
+#elif defined(_MSC_VER)
+#pragma warning(push, 0)
+#endif
+
 #include "plog/Log.h"
 
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic pop
+#elif defined(_MSC_VER)
+#pragma warning(pop)
+#endif
+
 namespace rtc {
 
 enum class LogLevel { // Don't change, it must match plog severity

include/rtc/message.hpp

@@ -30,6 +30,7 @@ namespace rtc {
 struct Message : binary {
 	enum Type { Binary, String, Control, Reset };
 
+	Message(const Message &message) = default;
 	Message(size_t size, Type type_ = Binary) : binary(size), type(type_) {}
 
 	template <typename Iterator>
@@ -41,8 +42,7 @@ struct Message : binary {
 	std::shared_ptr<Reliability> reliability;
 };
 
-using message_ptr = std::shared_ptr<const Message>;
+using message_ptr = std::shared_ptr<Message>;
-using mutable_message_ptr = std::shared_ptr<Message>;
 using message_callback = std::function<void(message_ptr message)>;
 
 constexpr auto message_size_func = [](const message_ptr &m) -> size_t {

include/rtc/peerconnection.hpp

@@ -48,7 +48,7 @@ class SctpTransport;
 using certificate_ptr = std::shared_ptr<Certificate>;
 using future_certificate_ptr = std::shared_future<certificate_ptr>;
 
-class PeerConnection : public std::enable_shared_from_this<PeerConnection> {
+class PeerConnection final : public std::enable_shared_from_this<PeerConnection> {
 public:
 	enum class State : int {
 		New = RTC_NEW,
@@ -79,6 +79,7 @@ public:
 	std::optional<string> localAddress() const;
 	std::optional<string> remoteAddress() const;
 
+	void setLocalDescription(std::optional<Description> description = nullopt);
 	void setRemoteDescription(Description description);
 	void addRemoteCandidate(Candidate candidate);
 
@@ -91,17 +92,23 @@ public:
 	void onStateChange(std::function<void(State state)> callback);
 	void onGatheringStateChange(std::function<void(GatheringState state)> callback);
 
-	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
-
 	// Stats
 	void clearStats();
 	size_t bytesSent();
 	size_t bytesReceived();
 	std::optional<std::chrono::milliseconds> rtt();
 
-private:
+	// Media
-	init_token mInitToken = Init::Token();
+	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);
+
+private:
 	std::shared_ptr<IceTransport> initIceTransport(Description::Role role);
 	std::shared_ptr<DtlsTransport> initDtlsTransport();
 	std::shared_ptr<SctpTransport> initSctpTransport();
@@ -110,6 +117,7 @@ private:
 	void endLocalCandidates();
 	bool checkFingerprint(const std::string &fingerprint) const;
 	void forwardMessage(message_ptr message);
+	void forwardMedia(message_ptr message);
 	void forwardBufferedAmount(uint16_t stream, size_t amount);
 
 	std::shared_ptr<DataChannel> emplaceDataChannel(Description::Role role, const string &label,
@@ -129,9 +137,13 @@ private:
 
 	void resetCallbacks();
 
+	void outgoingMedia(message_ptr message);
+
 	const Configuration mConfig;
 	const future_certificate_ptr mCertificate;
 
+	init_token mInitToken = Init::Token();
+
 	std::optional<Description> mLocalDescription, mRemoteDescription;
 	mutable std::recursive_mutex mLocalDescriptionMutex, mRemoteDescriptionMutex;
 
@@ -150,6 +162,7 @@ private:
 	synchronized_callback<const Candidate &> mLocalCandidateCallback;
 	synchronized_callback<State> mStateChangeCallback;
 	synchronized_callback<GatheringState> mGatheringStateChangeCallback;
+	synchronized_callback<const binary &> mMediaCallback;
 };
 
 } // namespace rtc

include/rtc/queue.hpp

@@ -44,6 +44,7 @@ public:
 	void push(T element);
 	std::optional<T> pop();
 	std::optional<T> peek();
+	std::optional<T> exchange(T element);
 	bool wait(const std::optional<std::chrono::milliseconds> &duration = nullopt);
 
 private:
@@ -59,7 +60,10 @@ private:
 
 template <typename T>
 Queue<T>::Queue(size_t limit, amount_function func) : mLimit(limit), mAmount(0) {
-	mAmountFunction = func ? func : [](const T &element) -> size_t { return 1; };
+	mAmountFunction = func ? func : [](const T &element) -> size_t {
+		static_cast<void>(element);
+		return 1;
+	};
 }
 
 template <typename T> Queue<T>::~Queue() { stop(); }
@@ -118,6 +122,16 @@ template <typename T> std::optional<T> Queue<T>::peek() {
 	}
 }
 
+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 {
+		return nullopt;
+	}
+}
+
 template <typename T>
 bool Queue<T>::wait(const std::optional<std::chrono::milliseconds> &duration) {
 	std::unique_lock lock(mMutex);

include/rtc/rtc.h

@@ -27,6 +27,14 @@ extern "C" {
 
 // libdatachannel C API
 
+#ifndef RTC_ENABLE_MEDIA
+#define RTC_ENABLE_MEDIA 1
+#endif
+
+#ifndef RTC_ENABLE_WEBSOCKET
+#define RTC_ENABLE_WEBSOCKET 1
+#endif
+
 typedef enum {
 	RTC_NEW = 0,
 	RTC_CONNECTING = 1,
@@ -42,8 +50,7 @@ typedef enum {
 	RTC_GATHERING_COMPLETE = 2
 } rtcGatheringState;
 
-// Don't change, it must match plog severity
+typedef enum { // Don't change, it must match plog severity
-typedef enum {
 	RTC_LOG_NONE = 0,
 	RTC_LOG_FATAL = 1,
 	RTC_LOG_ERROR = 2,
@@ -76,10 +83,10 @@ typedef void (*availableCallbackFunc)(void *ptr);
 void rtcInitLogger(rtcLogLevel level);
 
 // User pointer
-void rtcSetUserPointer(int i, void *ptr);
+void rtcSetUserPointer(int id, void *ptr);
 
 // PeerConnection
-int rtcCreatePeerConnection(const rtcConfiguration *config);
+int rtcCreatePeerConnection(const rtcConfiguration *config); // returns pc id
 int rtcDeletePeerConnection(int pc);
 
 int rtcSetDataChannelCallback(int pc, dataChannelCallbackFunc cb);
@@ -95,24 +102,32 @@ int rtcGetLocalAddress(int pc, char *buffer, int size);
 int rtcGetRemoteAddress(int pc, char *buffer, int size);
 
 // DataChannel
-int rtcCreateDataChannel(int pc, const char *label);
+int rtcCreateDataChannel(int pc, const char *label); // returns dc id
 int rtcDeleteDataChannel(int dc);
 
 int rtcGetDataChannelLabel(int dc, char *buffer, int size);
-int rtcSetOpenCallback(int dc, openCallbackFunc cb);
-int rtcSetClosedCallback(int dc, closedCallbackFunc cb);
-int rtcSetErrorCallback(int dc, errorCallbackFunc cb);
-int rtcSetMessageCallback(int dc, messageCallbackFunc cb);
-int rtcSendMessage(int dc, const char *data, int size);
 
-int rtcGetBufferedAmount(int dc); // total size buffered to send
+// WebSocket
-int rtcSetBufferedAmountLowThreshold(int dc, int amount);
+#if RTC_ENABLE_WEBSOCKET
-int rtcSetBufferedAmountLowCallback(int dc, bufferedAmountLowCallbackFunc cb);
+int rtcCreateWebSocket(const char *url); // returns ws id
+int rtcDeleteWebsocket(int ws);
+#endif
 
-// DataChannel extended API
+// DataChannel and WebSocket common API
-int rtcGetAvailableAmount(int dc); // total size available to receive
+int rtcSetOpenCallback(int id, openCallbackFunc cb);
-int rtcSetAvailableCallback(int dc, availableCallbackFunc cb);
+int rtcSetClosedCallback(int id, closedCallbackFunc cb);
-int rtcReceiveMessage(int dc, char *buffer, int *size);
+int rtcSetErrorCallback(int id, errorCallbackFunc cb);
+int rtcSetMessageCallback(int id, messageCallbackFunc cb);
+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);
+
+// 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);
 
 // Cleanup
 void rtcCleanup();

include/rtc/rtc.hpp

@@ -23,6 +23,7 @@
 //
 #include "datachannel.hpp"
 #include "peerconnection.hpp"
+#include "websocket.hpp"
 
 // C API
 #include "rtc.h"

include/rtc/websocket.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_WEBSOCKET_H
+#define RTC_WEBSOCKET_H
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "channel.hpp"
+#include "include.hpp"
+#include "init.hpp"
+#include "message.hpp"
+#include "queue.hpp"
+
+#include <atomic>
+#include <optional>
+#include <thread>
+#include <variant>
+
+namespace rtc {
+
+class TcpTransport;
+class TlsTransport;
+class WsTransport;
+
+class WebSocket final : public Channel, public std::enable_shared_from_this<WebSocket> {
+public:
+	enum class State : int {
+		Connecting = 0,
+		Open = 1,
+		Closing = 2,
+		Closed = 3,
+	};
+
+	WebSocket();
+	~WebSocket();
+
+	State readyState() const;
+
+	void open(const string &url);
+	void close() override;
+	bool send(const std::variant<binary, string> &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;
+	size_t availableAmount() const override; // total size available to receive
+
+private:
+	bool changeState(State state);
+	void remoteClose();
+	bool outgoing(message_ptr message);
+	void incoming(message_ptr message);
+
+	std::shared_ptr<TcpTransport> initTcpTransport();
+	std::shared_ptr<TlsTransport> initTlsTransport();
+	std::shared_ptr<WsTransport> initWsTransport();
+	void closeTransports();
+
+	init_token mInitToken = Init::Token();
+
+	std::shared_ptr<TcpTransport> mTcpTransport;
+	std::shared_ptr<TlsTransport> mTlsTransport;
+	std::shared_ptr<WsTransport> mWsTransport;
+	std::recursive_mutex mInitMutex;
+
+	string mScheme, mHost, mHostname, mService, mPath;
+	std::atomic<State> mState = State::Closed;
+
+	Queue<message_ptr> mRecvQueue;
+};
+} // namespace rtc
+
+#endif
+
+#endif // RTC_WEBSOCKET_H

src/base64.cpp

@@ -0,0 +1,65 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "base64.hpp"
+
+namespace rtc {
+
+using std::to_integer;
+
+string to_base64(const binary &data) {
+	static const char tab[] =
+	    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+	string out;
+	out.reserve(3 * ((data.size() + 3) / 4));
+	int i = 0;
+	while (data.size() - i >= 3) {
+		auto d0 = to_integer<uint8_t>(data[i]);
+		auto d1 = to_integer<uint8_t>(data[i + 1]);
+		auto d2 = to_integer<uint8_t>(data[i + 2]);
+		out += tab[d0 >> 2];
+		out += tab[((d0 & 3) << 4) | (d1 >> 4)];
+		out += tab[((d1 & 0x0F) << 2) | (d2 >> 6)];
+		out += tab[d2 & 0x3F];
+		i += 3;
+	}
+
+	int left = data.size() - i;
+	if (left) {
+		auto d0 = to_integer<uint8_t>(data[i]);
+		out += tab[d0 >> 2];
+		if (left == 1) {
+			out += tab[(d0 & 3) << 4];
+			out += '=';
+		} else { // left == 2
+			auto d1 = to_integer<uint8_t>(data[i + 1]);
+			out += tab[((d0 & 3) << 4) | (d1 >> 4)];
+			out += tab[(d1 & 0x0F) << 2];
+		}
+		out += '=';
+	}
+
+	return out;
+}
+
+} // namespace rtc
+
+#endif

src/base64.hpp

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

src/candidate.cpp

@@ -60,12 +60,19 @@ bool Candidate::resolve(ResolveMode mode) {
 	if (mIsResolved)
 		return true;
 
+	PLOG_VERBOSE << "Resolving candidate (mode="
+				 << (mode == ResolveMode::Simple ? "simple" : "lookup")
+				 << "): " << mCandidate;
+
 	// See RFC 8445 for format
-	std::stringstream ss(mCandidate);
+	std::istringstream iss(mCandidate);
 	int component{0}, priority{0};
 	string foundation, transport, node, service, typ_, type;
-	if (ss >> foundation >> component >> transport >> priority &&
+	if (iss >> foundation >> component >> transport >> priority &&
-	    ss >> node >> service >> typ_ >> type && typ_ == "typ") {
+	    iss >> node >> service >> typ_ >> type && typ_ == "typ") {
+
+		string left;
+		std::getline(iss, left);
 
 		// Try to resolve the node
 		struct addrinfo hints = {};
@@ -94,15 +101,13 @@ bool Candidate::resolve(ResolveMode mode) {
 					if (getnameinfo(p->ai_addr, p->ai_addrlen, nodebuffer, MAX_NUMERICNODE_LEN,
 					                servbuffer, MAX_NUMERICSERV_LEN,
 					                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
-						string left;
-						std::getline(ss, left);
 						const char sp{' '};
-						ss.clear();
+						std::ostringstream oss;
-						ss << foundation << sp << component << sp << transport << sp << priority;
+						oss << foundation << sp << component << sp << transport << sp << priority;
-						ss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
+						oss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
-						if (!left.empty())
+						oss << left;
-							ss << left;
+						mCandidate = oss.str();
-						mCandidate = ss.str();
+						PLOG_VERBOSE << "Resolved candidate: " << mCandidate;
 						return mIsResolved = true;
 					}
 				}

src/certificate.cpp

@@ -31,93 +31,43 @@ using std::unique_ptr;
 
 #if USE_GNUTLS
 
-#include <gnutls/crypto.h>
-
-namespace {
-
-void check_gnutls(int ret, const string &message = "GnuTLS error") {
-	if (ret != GNUTLS_E_SUCCESS)
-		throw std::runtime_error(message + ": " + gnutls_strerror(ret));
-}
-
-gnutls_certificate_credentials_t *create_credentials() {
-	auto creds = new gnutls_certificate_credentials_t;
-	check_gnutls(gnutls_certificate_allocate_credentials(creds));
-	return creds;
-}
-
-void delete_credentials(gnutls_certificate_credentials_t *creds) {
-	gnutls_certificate_free_credentials(*creds);
-	delete creds;
-}
-
-gnutls_x509_crt_t *create_crt() {
-	auto crt = new gnutls_x509_crt_t;
-	check_gnutls(gnutls_x509_crt_init(crt));
-	return crt;
-}
-
-void delete_crt(gnutls_x509_crt_t *crt) {
-	gnutls_x509_crt_deinit(*crt);
-	delete crt;
-}
-
-gnutls_x509_privkey_t *create_privkey() {
-	auto privkey = new gnutls_x509_privkey_t;
-	check_gnutls(gnutls_x509_privkey_init(privkey));
-	return privkey;
-}
-
-void delete_privkey(gnutls_x509_privkey_t *privkey) {
-	gnutls_x509_privkey_deinit(*privkey);
-	delete privkey;
-}
-
-gnutls_datum_t make_datum(char *data, size_t size) {
-	gnutls_datum_t datum;
-	datum.data = reinterpret_cast<unsigned char *>(data);
-	datum.size = size;
-	return datum;
-}
-
-} // namespace
-
 namespace rtc {
 
 Certificate::Certificate(string crt_pem, string key_pem)
-    : mCredentials(create_credentials(), delete_credentials) {
+    : mCredentials(gnutls::new_credentials(), gnutls::free_credentials) {
 
-	gnutls_datum_t crt_datum = make_datum(crt_pem.data(), crt_pem.size());
+	gnutls_datum_t crt_datum = gnutls::make_datum(crt_pem.data(), crt_pem.size());
-	gnutls_datum_t key_datum = make_datum(key_pem.data(), key_pem.size());
+	gnutls_datum_t key_datum = gnutls::make_datum(key_pem.data(), key_pem.size());
 
-	check_gnutls(gnutls_certificate_set_x509_key_mem(*mCredentials, &crt_datum, &key_datum,
+	gnutls::check(gnutls_certificate_set_x509_key_mem(*mCredentials, &crt_datum, &key_datum,
-	                                                 GNUTLS_X509_FMT_PEM),
+	                                                  GNUTLS_X509_FMT_PEM),
-	             "Unable to import PEM");
+	              "Unable to import PEM");
 
-	auto create_crt_list = [this]() -> gnutls_x509_crt_t * {
+	auto new_crt_list = [this]() -> gnutls_x509_crt_t * {
 		gnutls_x509_crt_t *crt_list = nullptr;
 		unsigned int crt_list_size = 0;
-		check_gnutls(gnutls_certificate_get_x509_crt(*mCredentials, 0, &crt_list, &crt_list_size));
+		gnutls::check(gnutls_certificate_get_x509_crt(*mCredentials, 0, &crt_list, &crt_list_size));
 		assert(crt_list_size == 1);
 		return crt_list;
 	};
 
-	auto delete_crt_list = [](gnutls_x509_crt_t *crt_list) {
+	auto free_crt_list = [](gnutls_x509_crt_t *crt_list) {
 		gnutls_x509_crt_deinit(crt_list[0]);
 		gnutls_free(crt_list);
 	};
 
-	std::unique_ptr<gnutls_x509_crt_t, decltype(delete_crt_list)> crt_list(create_crt_list(),
+	std::unique_ptr<gnutls_x509_crt_t, decltype(free_crt_list)> crt_list(new_crt_list(),
-	                                                                       delete_crt_list);
+	                                                                     free_crt_list);
 
 	mFingerprint = make_fingerprint(*crt_list);
 }
 
 Certificate::Certificate(gnutls_x509_crt_t crt, gnutls_x509_privkey_t privkey)
-    : mCredentials(create_credentials(), delete_credentials), mFingerprint(make_fingerprint(crt)) {
+    : mCredentials(gnutls::new_credentials(), gnutls::free_credentials),
+      mFingerprint(make_fingerprint(crt)) {
 
-	check_gnutls(gnutls_certificate_set_x509_key(*mCredentials, &crt, 1, privkey),
+	gnutls::check(gnutls_certificate_set_x509_key(*mCredentials, &crt, 1, privkey),
-	             "Unable to set certificate and key pair in credentials");
+	              "Unable to set certificate and key pair in credentials");
 }
 
 gnutls_certificate_credentials_t Certificate::credentials() const { return *mCredentials; }
@@ -128,8 +78,8 @@ string make_fingerprint(gnutls_x509_crt_t crt) {
 	const size_t size = 32;
 	unsigned char buffer[size];
 	size_t len = size;
-	check_gnutls(gnutls_x509_crt_get_fingerprint(crt, GNUTLS_DIG_SHA256, buffer, &len),
+	gnutls::check(gnutls_x509_crt_get_fingerprint(crt, GNUTLS_DIG_SHA256, buffer, &len),
-	             "X509 fingerprint error");
+	              "X509 fingerprint error");
 
 	std::ostringstream oss;
 	oss << std::hex << std::uppercase << std::setfill('0');
@@ -144,13 +94,13 @@ string make_fingerprint(gnutls_x509_crt_t crt) {
 namespace {
 
 certificate_ptr make_certificate_impl(string commonName) {
-	std::unique_ptr<gnutls_x509_crt_t, decltype(&delete_crt)> crt(create_crt(), delete_crt);
+	using namespace gnutls;
-	std::unique_ptr<gnutls_x509_privkey_t, decltype(&delete_privkey)> privkey(create_privkey(),
+	unique_ptr<gnutls_x509_crt_t, decltype(&free_crt)> crt(new_crt(), free_crt);
-	                                                                          delete_privkey);
+	unique_ptr<gnutls_x509_privkey_t, decltype(&free_privkey)> privkey(new_privkey(), free_privkey);
 
 	const unsigned int bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA, GNUTLS_SEC_PARAM_HIGH);
-	check_gnutls(gnutls_x509_privkey_generate(*privkey, GNUTLS_PK_RSA, bits, 0),
+	gnutls::check(gnutls_x509_privkey_generate(*privkey, GNUTLS_PK_RSA, bits, 0),
-	             "Unable to generate key pair");
+	              "Unable to generate key pair");
 
 	using namespace std::chrono;
 	auto now = time_point_cast<seconds>(system_clock::now());
@@ -166,8 +116,8 @@ certificate_ptr make_certificate_impl(string commonName) {
 	gnutls_rnd(GNUTLS_RND_NONCE, serial, serialSize);
 	gnutls_x509_crt_set_serial(*crt, serial, serialSize);
 
-	check_gnutls(gnutls_x509_crt_sign2(*crt, *crt, *privkey, GNUTLS_DIG_SHA256, 0),
+	gnutls::check(gnutls_x509_crt_sign2(*crt, *crt, *privkey, GNUTLS_DIG_SHA256, 0),
-	             "Unable to auto-sign certificate");
+	              "Unable to auto-sign certificate");
 
 	return std::make_shared<Certificate>(*crt, *privkey);
 }
@@ -176,30 +126,24 @@ certificate_ptr make_certificate_impl(string commonName) {
 
 } // namespace rtc
 
-#else
+#else // USE_GNUTLS==0
-
-#include <openssl/err.h>
-#include <openssl/pem.h>
-#include <openssl/ssl.h>
 
 namespace rtc {
 
 Certificate::Certificate(string crt_pem, string key_pem) {
-    BIO *bio;
+	BIO *bio = BIO_new(BIO_s_mem());
+	BIO_write(bio, crt_pem.data(), 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 = BIO_new(BIO_s_mem());
-    BIO_write(bio, crt_pem.data(), crt_pem.size());
+	BIO_write(bio, key_pem.data(), key_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());
 	mPKey = shared_ptr<EVP_PKEY>(PEM_read_bio_PrivateKey(bio, nullptr, 0, 0), EVP_PKEY_free);
-    BIO_free(bio);
+	BIO_free(bio);
-    if (!mPKey)
+	if (!mPKey)
-      throw std::invalid_argument("Unable to import PEM key PEM");
+		throw std::invalid_argument("Unable to import PEM key PEM");
 
 	mFingerprint = make_fingerprint(mX509.get());
 }
@@ -254,7 +198,8 @@ certificate_ptr make_certificate_impl(string commonName) {
 		throw std::runtime_error("Unable to generate key pair");
 
 	const size_t serialSize = 16;
-	const auto *commonNameBytes = reinterpret_cast<const unsigned char *>(commonName.c_str());
+	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) ||

src/certificate.hpp

@@ -20,16 +20,11 @@
 #define RTC_CERTIFICATE_H
 
 #include "include.hpp"
+#include "tls.hpp"
 
 #include <future>
 #include <tuple>
 
-#if USE_GNUTLS
-#include <gnutls/x509.h>
-#else
-#include <openssl/x509.h>
-#endif
-
 namespace rtc {
 
 class Certificate {

src/datachannel.cpp

@@ -154,13 +154,13 @@ bool DataChannel::isOpen(void) const { return mIsOpen; }
 bool DataChannel::isClosed(void) const { return mIsClosed; }
 
 size_t DataChannel::maxMessageSize() const {
-	size_t max = DEFAULT_MAX_MESSAGE_SIZE;
+	size_t remoteMax = DEFAULT_MAX_MESSAGE_SIZE;
 	if (auto pc = mPeerConnection.lock())
 		if (auto description = pc->remoteDescription())
 			if (auto maxMessageSize = description->maxMessageSize())
-				return *maxMessageSize > 0 ? *maxMessageSize : LOCAL_MAX_MESSAGE_SIZE;
+				remoteMax = *maxMessageSize > 0 ? *maxMessageSize : LOCAL_MAX_MESSAGE_SIZE;
 
-	return std::min(max, LOCAL_MAX_MESSAGE_SIZE);
+	return std::min(remoteMax, LOCAL_MAX_MESSAGE_SIZE);
 }
 
 size_t DataChannel::availableAmount() const { return mRecvQueue.amount(); }
@@ -196,7 +196,7 @@ void DataChannel::open(shared_ptr<SctpTransport> transport) {
 	transport->send(make_message(buffer.begin(), buffer.end(), Message::Control, mStream));
 }
 
-bool DataChannel::outgoing(mutable_message_ptr message) {
+bool DataChannel::outgoing(message_ptr message) {
 	if (mIsClosed)
 		throw std::runtime_error("DataChannel is closed");
 
@@ -214,6 +214,9 @@ bool DataChannel::outgoing(mutable_message_ptr message) {
 }
 
 void DataChannel::incoming(message_ptr message) {
+	if (!message)
+		return;
+
 	switch (message->type) {
 	case Message::Control: {
 		auto raw = reinterpret_cast<const uint8_t *>(message->data());

src/description.cpp

@@ -29,7 +29,7 @@ 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();
 }
@@ -50,7 +50,8 @@ Description::Description(const string &sdp, const string &typeString)
 Description::Description(const string &sdp, Type type) : Description(sdp, type, Role::ActPass) {}
 
 Description::Description(const string &sdp, Type type, Role role)
-    : mType(Type::Unspec), mRole(role), mMid("0"), mIceUfrag(""), mIcePwd(""), mTrickle(true) {
+    : mType(Type::Unspec), mRole(role) {
+	mData.mid = "data";
 	hintType(type);
 
 	auto seed = std::chrono::system_clock::now().time_since_epoch().count();
@@ -59,37 +60,79 @@ Description::Description(const string &sdp, Type type, Role role)
 	mSessionId = std::to_string(uniform(generator));
 
 	std::istringstream ss(sdp);
-	string line;
+	std::optional<Media> currentMedia;
-	while (std::getline(ss, line)) {
+
+	bool finished;
+	do {
+		string line;
+		finished = !std::getline(ss, line) && line.empty();
 		trim_end(line);
-		if (hasprefix(line, "a=setup:")) {
+
-			const string setup = line.substr(line.find(':') + 1);
+		// Media description line (aka m-line)
-			if (setup == "active")
+		if (finished || match_prefix(line, "m=")) {
-				mRole = Role::Active;
+			if (currentMedia) {
-			else if (setup == "passive")
+				if (!currentMedia->mid.empty()) {
-				mRole = Role::Passive;
+					if (currentMedia->type == "application")
-			else
+						mData.mid = currentMedia->mid;
-				mRole = Role::ActPass;
+					else
-		} else if (hasprefix(line, "a=mid:")) {
+						mMedia.emplace(currentMedia->mid, std::move(*currentMedia));
-			mMid = line.substr(line.find(':') + 1);
+
-		} else if (hasprefix(line, "a=fingerprint:sha-256")) {
+				} else if (line.find(" ICE/SDP") != string::npos) {
-			mFingerprint = line.substr(line.find(' ') + 1);
+					PLOG_WARNING << "SDP \"m=\" line has no corresponding mid, ignoring";
-			std::transform(mFingerprint->begin(), mFingerprint->end(), mFingerprint->begin(),
+				}
-						   [](char c) { return std::toupper(c); });
+			}
-		} else if (hasprefix(line, "a=ice-ufrag")) {
+			if (!finished)
-			mIceUfrag = line.substr(line.find(':') + 1);
+				currentMedia.emplace(Media(line.substr(2)));
-		} else if (hasprefix(line, "a=ice-pwd")) {
+
-			mIcePwd = line.substr(line.find(':') + 1);
+			// Attribute line
-		} else if (hasprefix(line, "a=sctp-port")) {
+		} else if (match_prefix(line, "a=")) {
-			mSctpPort = uint16_t(std::stoul(line.substr(line.find(':') + 1)));
+			string attr = line.substr(2);
-		} else if (hasprefix(line, "a=max-message-size")) {
+
-			mMaxMessageSize = size_t(std::stoul(line.substr(line.find(':') + 1)));
+			string key, value;
-		} else if (hasprefix(line, "a=candidate")) {
+			if (size_t separator = attr.find(':'); separator != string::npos) {
-			addCandidate(Candidate(line.substr(2), mMid));
+				key = attr.substr(0, separator);
-		} else if (hasprefix(line, "a=end-of-candidates")) {
+				value = attr.substr(separator + 1);
-			mTrickle = false;
+			} else {
+				key = attr;
+			}
+
+			if (key == "mid") {
+				if (currentMedia)
+					currentMedia->mid = value;
+
+			} else if (key == "setup") {
+				if (value == "active")
+					mRole = Role::Active;
+				else if (value == "passive")
+					mRole = Role::Passive;
+				else
+					mRole = Role::ActPass;
+
+			} else if (key == "fingerprint") {
+				if (match_prefix(value, "sha-256 ")) {
+					mFingerprint = value.substr(8);
+					std::transform(mFingerprint->begin(), mFingerprint->end(),
+					               mFingerprint->begin(), [](char c) { return std::toupper(c); });
+				} else {
+					PLOG_WARNING << "Unknown SDP fingerprint type: " << value;
+				}
+			} else if (key == "ice-ufrag") {
+				mIceUfrag = value;
+			} else if (key == "ice-pwd") {
+				mIcePwd = value;
+			} else if (key == "sctp-port") {
+				mData.sctpPort = uint16_t(std::stoul(value));
+			} else if (key == "max-message-size") {
+				mData.maxMessageSize = size_t(std::stoul(value));
+			} else if (key == "candidate") {
+				addCandidate(Candidate(attr, currentMedia ? currentMedia->mid : mData.mid));
+			} else if (key == "end-of-candidates") {
+				mEnded = true;
+			} else if (currentMedia) {
+				currentMedia->attributes.emplace_back(line.substr(2));
+			}
 		}
-	}
+	} while (!finished);
 }
 
 Description::Type Description::type() const { return mType; }
@@ -100,15 +143,15 @@ Description::Role Description::role() const { return mRole; }
 
 string Description::roleString() const { return roleToString(mRole); }
 
-string Description::mid() const { return mMid; }
+string Description::dataMid() const { return mData.mid; }
 
 std::optional<string> Description::fingerprint() const { return mFingerprint; }
 
-std::optional<uint16_t> Description::sctpPort() const { return mSctpPort; }
+std::optional<uint16_t> Description::sctpPort() const { return mData.sctpPort; }
 
-std::optional<size_t> Description::maxMessageSize() const { return mMaxMessageSize; }
+std::optional<size_t> Description::maxMessageSize() const { return mData.maxMessageSize; }
 
-bool Description::trickleEnabled() const { return mTrickle; }
+bool Description::ended() const { return mEnded; }
 
 void Description::hintType(Type type) {
 	if (mType == Type::Unspec) {
@@ -122,23 +165,33 @@ void Description::setFingerprint(string fingerprint) {
 	mFingerprint.emplace(std::move(fingerprint));
 }
 
-void Description::setSctpPort(uint16_t port) { mSctpPort.emplace(port); }
+void Description::setSctpPort(uint16_t port) { mData.sctpPort.emplace(port); }
 
-void Description::setMaxMessageSize(size_t size) { mMaxMessageSize.emplace(size); }
+void Description::setMaxMessageSize(size_t size) { mData.maxMessageSize.emplace(size); }
 
 void Description::addCandidate(Candidate candidate) {
 	mCandidates.emplace_back(std::move(candidate));
 }
 
-void Description::endCandidates() { mTrickle = false; }
+void Description::endCandidates() { mEnded = true; }
 
 std::vector<Candidate> Description::extractCandidates() {
 	std::vector<Candidate> result;
 	std::swap(mCandidates, result);
-	mTrickle = true;
+	mEnded = false;
 	return result;
 }
 
+bool Description::hasMedia() const { return !mMedia.empty(); }
+
+void Description::addMedia(const Description &source) {
+	for (auto [mid, media] : source.mMedia)
+		if (mid != mData.mid)
+			mMedia.emplace(mid, media);
+		else
+			PLOG_WARNING << "Media mid \"" << mid << "\" is the same as data mid, ignoring";
+}
+
 Description::operator string() const { return generateSdp("\r\n"); }
 
 string Description::generateSdp(const string &eol) const {
@@ -146,36 +199,78 @@ string Description::generateSdp(const string &eol) const {
 		throw std::logic_error("Fingerprint must be set to generate an SDP string");
 
 	std::ostringstream sdp;
+
+	// Header
 	sdp << "v=0" << eol;
 	sdp << "o=- " << mSessionId << " 0 IN IP4 127.0.0.1" << eol;
 	sdp << "s=-" << eol;
 	sdp << "t=0 0" << eol;
-	sdp << "a=group:BUNDLE 0" << eol;
+
-	sdp << "m=application 9 UDP/DTLS/SCTP webrtc-datachannel" << eol;
+	// Bundle
+	// see Negotiating Media Multiplexing Using the Session Description Protocol
+	// https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-54
+	sdp << "a=group:BUNDLE";
+	for (const auto &[mid, _] : mMedia)
+		sdp << " " << mid;
+	sdp << " " << mData.mid << eol;
+
+	// Data
+	const string dataDescription = "UDP/DTLS/SCTP webrtc-datachannel";
+	sdp << "m=application" << ' ' << (!mMedia.empty() ? 0 : 9) << ' ' << dataDescription << eol;
 	sdp << "c=IN IP4 0.0.0.0" << eol;
+	if (!mMedia.empty())
+		sdp << "a=bundle-only" << eol;
+	sdp << "a=mid:" << mData.mid << eol;
+	if (mData.sctpPort)
+		sdp << "a=sctp-port:" << *mData.sctpPort << eol;
+	if (mData.maxMessageSize)
+		sdp << "a=max-message-size:" << *mData.maxMessageSize << eol;
+
+	// Non-data media
+	if (!mMedia.empty()) {
+		// Lip-sync
+		sdp << "a=group:LS";
+		for (const auto &[mid, _] : mMedia)
+			sdp << " " << mid;
+		sdp << eol;
+
+		// Descriptions and attributes
+		for (const auto &[_, media] : mMedia) {
+			sdp << "m=" << media.type << ' ' << 0 << ' ' << media.description << eol;
+			sdp << "c=IN IP4 0.0.0.0" << eol;
+			sdp << "a=bundle-only" << eol;
+			sdp << "a=mid:" << media.mid << eol;
+			for (const auto &attr : media.attributes)
+				sdp << "a=" << attr << eol;
+		}
+	}
+
+	// Common
+	sdp << "a=ice-options:trickle" << eol;
 	sdp << "a=ice-ufrag:" << mIceUfrag << eol;
 	sdp << "a=ice-pwd:" << mIcePwd << eol;
-	if (mTrickle)
-		sdp << "a=ice-options:trickle" << eol;
-	sdp << "a=mid:" << mMid << eol;
 	sdp << "a=setup:" << roleToString(mRole) << eol;
 	sdp << "a=dtls-id:1" << eol;
 	if (mFingerprint)
 		sdp << "a=fingerprint:sha-256 " << *mFingerprint << eol;
-	if (mSctpPort)
-		sdp << "a=sctp-port:" << *mSctpPort << eol;
-	if (mMaxMessageSize)
-		sdp << "a=max-message-size:" << *mMaxMessageSize << eol;
-	for (const auto &candidate : mCandidates) {
-		sdp << string(candidate) << eol;
-	}
 
-	if (!mTrickle)
+	// Candidates
+	for (const auto &candidate : mCandidates)
+		sdp << string(candidate) << eol;
+	if (mEnded)
 		sdp << "a=end-of-candidates" << eol;
 
 	return sdp.str();
 }
 
+Description::Media::Media(const string &mline) {
+	size_t p = mline.find(' ');
+	this->type = mline.substr(0, p);
+	if (p != string::npos)
+		if (size_t q = mline.find(' ', p + 1); q != string::npos)
+			this->description = mline.substr(q + 1);
+}
+
 Description::Type Description::stringToType(const string &typeString) {
 	if (typeString == "offer")
 		return Type::Offer;

src/dtlssrtptransport.cpp

@@ -0,0 +1,205 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "dtlssrtptransport.hpp"
+#include "tls.hpp"
+
+#if RTC_ENABLE_MEDIA
+
+#include <cstring>
+#include <exception>
+
+using std::shared_ptr;
+using std::to_integer;
+using std::to_string;
+
+namespace rtc {
+
+void DtlsSrtpTransport::Init() { srtp_init(); }
+
+void DtlsSrtpTransport::Cleanup() { srtp_shutdown(); }
+
+DtlsSrtpTransport::DtlsSrtpTransport(std::shared_ptr<IceTransport> lower,
+                                     shared_ptr<Certificate> certificate,
+                                     verifier_callback verifierCallback,
+                                     message_callback srtpRecvCallback,
+                                     state_callback stateChangeCallback)
+    : DtlsTransport(lower, certificate, std::move(verifierCallback),
+                    std::move(stateChangeCallback)),
+      mSrtpRecvCallback(std::move(srtpRecvCallback)) { // distinct from Transport recv callback
+
+	PLOG_DEBUG << "Initializing SRTP transport";
+
+#if USE_GNUTLS
+	PLOG_DEBUG << "Initializing DTLS-SRTP transport (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");
+#endif
+}
+
+DtlsSrtpTransport::~DtlsSrtpTransport() {
+	stop();
+
+	if (mCreated)
+		srtp_dealloc(mSrtp);
+}
+
+bool DtlsSrtpTransport::send(message_ptr message) {
+	if (!message)
+		return false;
+
+	int size = 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.
+	message->resize(size + SRTP_MAX_TRAILER_LEN);
+	if (srtp_err_status_t err = srtp_protect(mSrtp, message->data(), &size)) {
+		if (err == srtp_err_status_replay_fail)
+			throw std::runtime_error("SRTP packet is a replay");
+		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;
+}
+
+void DtlsSrtpTransport::incoming(message_ptr message) {
+	int size = message->size();
+	if (size == 0)
+		return;
+
+	// RFC 5764 5.1.2. Reception
+	// 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());
+
+	if (value >= 128 && value <= 192) {
+		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)) {
+			if (err == srtp_err_status_replay_fail)
+				PLOG_WARNING << "Incoming SRTP packet is a replay";
+			else
+				PLOG_WARNING << "SRTP unprotect error, status=" << err;
+			return;
+		}
+		PLOG_VERBOSE << "Unprotected SRTP packet, size=" << size;
+		message->resize(size);
+		mSrtpRecvCallback(message);
+
+	} else {
+		PLOG_WARNING << "Unknown packet type, value=" << value << ", size=" << size;
+	}
+}
+
+void DtlsSrtpTransport::postHandshake() {
+	if (mCreated)
+		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;
+
+	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
+	gnutls_datum_t clientKeyDatum, clientSaltDatum, serverKeyDatum, serverSaltDatum;
+	gnutls::check(gnutls_srtp_get_keys(mSession, material, materialLen, &clientKeyDatum,
+	                                   &clientSaltDatum, &serverKeyDatum, &serverSaltDatum),
+	              "Failed to derive SRTP keys");
+
+	if (clientKeyDatum.size != SRTP_AES_128_KEY_LEN)
+		throw std::logic_error("Unexpected SRTP master key length: " +
+		                       to_string(clientKeyDatum.size));
+	if (clientSaltDatum.size != SRTP_SALT_LEN)
+		throw std::logic_error("Unexpected SRTP salt length: " + to_string(clientSaltDatum.size));
+	if (serverKeyDatum.size != SRTP_AES_128_KEY_LEN)
+		throw std::logic_error("Unexpected SRTP master key length: " +
+		                       to_string(serverKeyDatum.size));
+	if (serverSaltDatum.size != SRTP_SALT_LEN)
+		throw std::logic_error("Unexpected SRTP salt size: " + to_string(serverSaltDatum.size));
+
+	clientKey = reinterpret_cast<const unsigned char *>(clientKeyDatum.data);
+	clientSalt = reinterpret_cast<const unsigned char *>(clientSaltDatum.data);
+
+	serverKey = reinterpret_cast<const unsigned char *>(serverKeyDatum.data);
+	serverSalt = reinterpret_cast<const unsigned char *>(serverSaltDatum.data);
+#else
+	// 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.
+	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");
+
+	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;
+#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);
+
+	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);
+
+	if (mIsClient) {
+		inbound.key = serverSessionKey;
+		outbound.key = clientSessionKey;
+	} else {
+		inbound.key = clientSessionKey;
+		outbound.key = serverSessionKey;
+	}
+
+	srtp_policy_t *policies = &inbound;
+	inbound.next = &outbound;
+	outbound.next = nullptr;
+
+	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;
+}
+
+} // namespace rtc
+
+#endif

src/dtlssrtptransport.hpp

@@ -0,0 +1,57 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_DTLS_SRTP_TRANSPORT_H
+#define RTC_DTLS_SRTP_TRANSPORT_H
+
+#include "dtlstransport.hpp"
+#include "include.hpp"
+
+#if RTC_ENABLE_MEDIA
+
+#include <srtp2/srtp.h>
+
+namespace rtc {
+
+class DtlsSrtpTransport final : public DtlsTransport {
+public:
+	static void Init();
+	static void Cleanup();
+
+	DtlsSrtpTransport(std::shared_ptr<IceTransport> lower, std::shared_ptr<Certificate> certificate,
+	                  verifier_callback verifierCallback, message_callback srtpRecvCallback,
+	                  state_callback stateChangeCallback);
+	~DtlsSrtpTransport();
+
+	bool send(message_ptr message) override;
+
+private:
+	void incoming(message_ptr message) override;
+	void postHandshake() override;
+
+	message_callback mSrtpRecvCallback;
+
+	srtp_t mSrtp;
+	bool mCreated = false;
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/dtlstransport.cpp

@@ -18,9 +18,7 @@
 
 #include "dtlstransport.hpp"
 #include "icetransport.hpp"
-#include "message.hpp"
 
-#include <cassert>
 #include <chrono>
 #include <cstring>
 #include <exception>
@@ -33,28 +31,10 @@ using std::string;
 using std::unique_ptr;
 using std::weak_ptr;
 
-#if USE_GNUTLS
-
-#include <gnutls/dtls.h>
-
-namespace {
-
-static bool check_gnutls(int ret, const string &message = "GnuTLS error") {
-	if (ret < 0) {
-		if (!gnutls_error_is_fatal(ret)) {
-			PLOG_INFO << gnutls_strerror(ret);
-			return false;
-		}
-		PLOG_ERROR << message << ": " << gnutls_strerror(ret);
-		throw std::runtime_error(message + ": " + gnutls_strerror(ret));
-	}
-	return true;
-}
-
-} // namespace
-
 namespace rtc {
 
+#if USE_GNUTLS
+
 void DtlsTransport::Init() {
 	// Nothing to do
 }
@@ -65,41 +45,47 @@ void DtlsTransport::Cleanup() {
 
 DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr certificate,
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
-    : Transport(lower), mCertificate(certificate), mState(State::Disconnected),
+    : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
       mVerifierCallback(std::move(verifierCallback)),
-      mStateChangeCallback(std::move(stateChangeCallback)) {
+      mIsClient(lower->role() == Description::Role::Active) {
 
 	PLOG_DEBUG << "Initializing DTLS transport (GnuTLS)";
 
-	bool active = lower->role() == Description::Role::Active;
+	gnutls_certificate_credentials_t creds = mCertificate->credentials();
-	unsigned int flags = GNUTLS_DATAGRAM | (active ? GNUTLS_CLIENT : GNUTLS_SERVER);
+	gnutls_certificate_set_verify_function(creds, CertificateCallback);
-	check_gnutls(gnutls_init(&mSession, flags));
 
-	// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
+	unsigned int flags = GNUTLS_DATAGRAM | (mIsClient ? GNUTLS_CLIENT : GNUTLS_SERVER);
-	// Therefore, the DTLS layer MUST NOT use any compression algorithm.
+	gnutls::check(gnutls_init(&mSession, flags));
-	// See https://tools.ietf.org/html/rfc8261#section-5
-	const char *priorities = "SECURE128:-VERS-SSL3.0:-ARCFOUR-128:-COMP-ALL:+COMP-NULL";
-	const char *err_pos = NULL;
-	check_gnutls(gnutls_priority_set_direct(mSession, priorities, &err_pos),
-	             "Unable to set TLS priorities");
 
-	gnutls_certificate_set_verify_function(mCertificate->credentials(), CertificateCallback);
+	try {
-	check_gnutls(
+		// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
-	    gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, mCertificate->credentials()));
+		// Therefore, the DTLS layer MUST NOT use any compression algorithm.
+		// See https://tools.ietf.org/html/rfc8261#section-5
+		const char *priorities = "SECURE128:-VERS-SSL3.0:-ARCFOUR-128:-COMP-ALL:+COMP-NULL";
+		const char *err_pos = NULL;
+		gnutls::check(gnutls_priority_set_direct(mSession, priorities, &err_pos),
+		              "Failed to set TLS priorities");
 
-	gnutls_dtls_set_timeouts(mSession,
+		gnutls::check(gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, creds));
-	                         1000,   // 1s retransmission timeout recommended by RFC 6347
-	                         30000); // 30s total timeout
-	gnutls_handshake_set_timeout(mSession, 30000);
 
-	gnutls_session_set_ptr(mSession, this);
+		gnutls_dtls_set_timeouts(mSession,
-	gnutls_transport_set_ptr(mSession, this);
+		                         1000,   // 1s retransmission timeout recommended by RFC 6347
-	gnutls_transport_set_push_function(mSession, WriteCallback);
+		                         30000); // 30s total timeout
-	gnutls_transport_set_pull_function(mSession, ReadCallback);
+		gnutls_handshake_set_timeout(mSession, 30000);
-	gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
 
-	mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
+		gnutls_session_set_ptr(mSession, this);
-	registerIncoming();
+		gnutls_transport_set_ptr(mSession, this);
+		gnutls_transport_set_push_function(mSession, WriteCallback);
+		gnutls_transport_set_pull_function(mSession, ReadCallback);
+		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
+
+		mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
+		registerIncoming();
+
+	} catch (...) {
+		gnutls_deinit(mSession);
+		throw;
+	}
 }
 
 DtlsTransport::~DtlsTransport() {
@@ -108,8 +94,6 @@ DtlsTransport::~DtlsTransport() {
 	gnutls_deinit(mSession);
 }
 
-DtlsTransport::State DtlsTransport::state() const { return mState; }
-
 bool DtlsTransport::stop() {
 	if (!Transport::stop())
 		return false;
@@ -121,7 +105,7 @@ bool DtlsTransport::stop() {
 }
 
 bool DtlsTransport::send(message_ptr message) {
-	if (!message || mState != State::Connected)
+	if (!message || state() != State::Connected)
 		return false;
 
 	PLOG_VERBOSE << "Send size=" << message->size();
@@ -134,7 +118,7 @@ bool DtlsTransport::send(message_ptr message) {
 	if (ret == GNUTLS_E_LARGE_PACKET)
 		return false;
 
-	return check_gnutls(ret);
+	return gnutls::check(ret);
 }
 
 void DtlsTransport::incoming(message_ptr message) {
@@ -147,9 +131,8 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
-void DtlsTransport::changeState(State state) {
+void DtlsTransport::postHandshake() {
-	if (mState.exchange(state) != state)
+	// Dummy
-		mStateChangeCallback(state);
 }
 
 void DtlsTransport::runRecvLoop() {
@@ -168,7 +151,7 @@ void DtlsTransport::runRecvLoop() {
 				throw std::runtime_error("MTU is too low");
 
 		} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ||
-		         !check_gnutls(ret, "TLS handshake failed"));
+		         !gnutls::check(ret, "DTLS handshake failed"));
 
 		// RFC 8261: DTLS MUST support sending messages larger than the current path MTU
 		// See https://tools.ietf.org/html/rfc8261#section-5
@@ -182,8 +165,9 @@ void DtlsTransport::runRecvLoop() {
 
 	// Receive loop
 	try {
-		PLOG_INFO << "DTLS handshake done";
+		PLOG_INFO << "DTLS handshake finished";
 		changeState(State::Connected);
+		postHandshake();
 
 		const size_t bufferSize = maxMtu;
 		char buffer[bufferSize];
@@ -200,7 +184,7 @@ void DtlsTransport::runRecvLoop() {
 				break;
 			}
 
-			if (check_gnutls(ret)) {
+			if (gnutls::check(ret)) {
 				if (ret == 0) {
 					// Closed
 					PLOG_DEBUG << "DTLS connection cleanly closed";
@@ -217,7 +201,7 @@ void DtlsTransport::runRecvLoop() {
 
 	gnutls_bye(mSession, GNUTLS_SHUT_RDWR);
 
-	PLOG_INFO << "DTLS disconnected";
+	PLOG_INFO << "DTLS closed";
 	changeState(State::Disconnected);
 	recv(nullptr);
 }
@@ -236,7 +220,7 @@ int DtlsTransport::CertificateCallback(gnutls_session_t session) {
 	}
 
 	gnutls_x509_crt_t crt;
-	check_gnutls(gnutls_x509_crt_init(&crt));
+	gnutls::check(gnutls_x509_crt_init(&crt));
 	int ret = gnutls_x509_crt_import(crt, &array[0], GNUTLS_X509_FMT_DER);
 	if (ret != GNUTLS_E_SUCCESS) {
 		gnutls_x509_crt_deinit(crt);
@@ -281,66 +265,21 @@ int DtlsTransport::TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms)
 	return !t->mIncomingQueue.empty() ? 1 : 0;
 }
 
-} // namespace rtc
-
 #else // USE_GNUTLS==0
 
-#include <openssl/bio.h>
-#include <openssl/ec.h>
-#include <openssl/err.h>
-#include <openssl/ssl.h>
-
-namespace {
-
-const int BIO_EOF = -1;
-
-string openssl_error_string(unsigned long err) {
-	const size_t bufferSize = 256;
-	char buffer[bufferSize];
-	ERR_error_string_n(err, buffer, bufferSize);
-	return string(buffer);
-}
-
-bool check_openssl(int success, const string &message = "OpenSSL error") {
-	if (success)
-		return true;
-
-	string str = openssl_error_string(ERR_get_error());
-	PLOG_ERROR << message << ": " << str;
-	throw std::runtime_error(message + ": " + str);
-}
-
-bool check_openssl_ret(SSL *ssl, int ret, const string &message = "OpenSSL error") {
-	if (ret == BIO_EOF)
-		return true;
-
-	unsigned long err = SSL_get_error(ssl, ret);
-	if (err == SSL_ERROR_NONE || err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
-		return true;
-	}
-	if (err == SSL_ERROR_ZERO_RETURN) {
-		PLOG_DEBUG << "DTLS connection cleanly closed";
-		return false;
-	}
-	string str = openssl_error_string(err);
-	PLOG_ERROR << str;
-	throw std::runtime_error(message + ": " + str);
-}
-
-} // namespace
-
-namespace rtc {
-
 BIO_METHOD *DtlsTransport::BioMethods = NULL;
 int DtlsTransport::TransportExIndex = -1;
 std::mutex DtlsTransport::GlobalMutex;
 
 void DtlsTransport::Init() {
 	std::lock_guard lock(GlobalMutex);
+
+	openssl::init();
+
 	if (!BioMethods) {
 		BioMethods = BIO_meth_new(BIO_TYPE_BIO, "DTLS writer");
 		if (!BioMethods)
-			throw std::runtime_error("Unable to BIO methods for DTLS writer");
+			throw std::runtime_error("Failed to create BIO methods for DTLS writer");
 		BIO_meth_set_create(BioMethods, BioMethodNew);
 		BIO_meth_set_destroy(BioMethods, BioMethodFree);
 		BIO_meth_set_write(BioMethods, BioMethodWrite);
@@ -357,60 +296,68 @@ void DtlsTransport::Cleanup() {
 
 DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certificate> certificate,
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
-    : Transport(lower), mCertificate(certificate), mState(State::Disconnected),
+    : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
       mVerifierCallback(std::move(verifierCallback)),
-      mStateChangeCallback(std::move(stateChangeCallback)) {
+      mIsClient(lower->role() == Description::Role::Active) {
-
 	PLOG_DEBUG << "Initializing DTLS transport (OpenSSL)";
 
-	if (!(mCtx = SSL_CTX_new(DTLS_method())))
+	try {
-		throw std::runtime_error("Unable to create SSL context");
+		if (!(mCtx = SSL_CTX_new(DTLS_method())))
+			throw std::runtime_error("Failed to create SSL context");
 
-	check_openssl(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
+		openssl::check(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
-	              "Unable to set SSL priorities");
+		               "Failed to set SSL priorities");
 
-	// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
+		// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
-	// Therefore, the DTLS layer MUST NOT use any compression algorithm.
+		// Therefore, the DTLS layer MUST NOT use any compression algorithm.
-	// See https://tools.ietf.org/html/rfc8261#section-5
+		// See https://tools.ietf.org/html/rfc8261#section-5
-	SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3 | SSL_OP_NO_COMPRESSION | SSL_OP_NO_QUERY_MTU);
+		SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3 | SSL_OP_NO_COMPRESSION | SSL_OP_NO_QUERY_MTU);
-	SSL_CTX_set_min_proto_version(mCtx, DTLS1_VERSION);
+		SSL_CTX_set_min_proto_version(mCtx, DTLS1_VERSION);
-	SSL_CTX_set_read_ahead(mCtx, 1);
+		SSL_CTX_set_read_ahead(mCtx, 1);
-	SSL_CTX_set_quiet_shutdown(mCtx, 1);
+		SSL_CTX_set_quiet_shutdown(mCtx, 1);
-	SSL_CTX_set_info_callback(mCtx, InfoCallback);
+		SSL_CTX_set_info_callback(mCtx, InfoCallback);
-	SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+		SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
-	                   CertificateCallback);
+		                   CertificateCallback);
-	SSL_CTX_set_verify_depth(mCtx, 1);
+		SSL_CTX_set_verify_depth(mCtx, 1);
 
-	auto [x509, pkey] = mCertificate->credentials();
+		auto [x509, pkey] = mCertificate->credentials();
-	SSL_CTX_use_certificate(mCtx, x509);
+		SSL_CTX_use_certificate(mCtx, x509);
-	SSL_CTX_use_PrivateKey(mCtx, pkey);
+		SSL_CTX_use_PrivateKey(mCtx, pkey);
 
-	check_openssl(SSL_CTX_check_private_key(mCtx), "SSL local private key check failed");
+		openssl::check(SSL_CTX_check_private_key(mCtx), "SSL local private key check failed");
 
-	if (!(mSsl = SSL_new(mCtx)))
+		if (!(mSsl = SSL_new(mCtx)))
-		throw std::runtime_error("Unable to create SSL instance");
+			throw std::runtime_error("Failed to create SSL instance");
 
-	SSL_set_ex_data(mSsl, TransportExIndex, this);
+		SSL_set_ex_data(mSsl, TransportExIndex, this);
 
-	if (lower->role() == Description::Role::Active)
+		if (mIsClient)
-		SSL_set_connect_state(mSsl);
+			SSL_set_connect_state(mSsl);
-	else
+		else
-		SSL_set_accept_state(mSsl);
+			SSL_set_accept_state(mSsl);
 
-	if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BioMethods)))
+		if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BioMethods)))
-		throw std::runtime_error("Unable to create BIO");
+			throw std::runtime_error("Failed to create BIO");
 
-	BIO_set_mem_eof_return(mInBio, BIO_EOF);
+		BIO_set_mem_eof_return(mInBio, BIO_EOF);
-	BIO_set_data(mOutBio, this);
+		BIO_set_data(mOutBio, this);
-	SSL_set_bio(mSsl, mInBio, mOutBio);
+		SSL_set_bio(mSsl, mInBio, mOutBio);
 
-	auto ecdh = unique_ptr<EC_KEY, decltype(&EC_KEY_free)>(
+		auto ecdh = unique_ptr<EC_KEY, decltype(&EC_KEY_free)>(
-	    EC_KEY_new_by_curve_name(NID_X9_62_prime256v1), EC_KEY_free);
+		    EC_KEY_new_by_curve_name(NID_X9_62_prime256v1), EC_KEY_free);
-	SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
+		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
-	SSL_set_tmp_ecdh(mSsl, ecdh.get());
+		SSL_set_tmp_ecdh(mSsl, ecdh.get());
 
-	mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
+		mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
-	registerIncoming();
+		registerIncoming();
+
+	} catch (...) {
+		if (mSsl)
+			SSL_free(mSsl);
+		if (mCtx)
+			SSL_CTX_free(mCtx);
+		throw;
+	}
 }
 
 DtlsTransport::~DtlsTransport() {
@@ -431,18 +378,14 @@ bool DtlsTransport::stop() {
 	return true;
 }
 
-DtlsTransport::State DtlsTransport::state() const { return mState; }
-
 bool DtlsTransport::send(message_ptr message) {
-	if (!message || mState != State::Connected)
+	if (!message || state() != State::Connected)
 		return false;
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
 	int ret = SSL_write(mSsl, message->data(), message->size());
-	if (!check_openssl_ret(mSsl, ret))
+	return openssl::check(mSsl, ret);
-		return false;
-	return true;
 }
 
 void DtlsTransport::incoming(message_ptr message) {
@@ -455,9 +398,8 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
-void DtlsTransport::changeState(State state) {
+void DtlsTransport::postHandshake() {
-	if (mState.exchange(state) != state)
+	// Dummy
-		mStateChangeCallback(state);
 }
 
 void DtlsTransport::runRecvLoop() {
@@ -468,7 +410,7 @@ void DtlsTransport::runRecvLoop() {
 
 		// Initiate the handshake
 		int ret = SSL_do_handshake(mSsl);
-		check_openssl_ret(mSsl, ret, "Handshake failed");
+		openssl::check(mSsl, ret, "Handshake failed");
 
 		const size_t bufferSize = maxMtu;
 		byte buffer[bufferSize];
@@ -478,10 +420,10 @@ void DtlsTransport::runRecvLoop() {
 				auto message = *mIncomingQueue.pop();
 				BIO_write(mInBio, message->data(), message->size());
 
-				if (mState == State::Connecting) {
+				if (state() == State::Connecting) {
 					// Continue the handshake
 					int ret = SSL_do_handshake(mSsl);
-					if (!check_openssl_ret(mSsl, ret, "Handshake failed"))
+					if (!openssl::check(mSsl, ret, "Handshake failed"))
 						break;
 
 					if (SSL_is_init_finished(mSsl)) {
@@ -489,13 +431,15 @@ void DtlsTransport::runRecvLoop() {
 						// MTU See https://tools.ietf.org/html/rfc8261#section-5
 						SSL_set_mtu(mSsl, maxMtu + 1);
 
-						PLOG_INFO << "DTLS handshake done";
+						PLOG_INFO << "DTLS handshake finished";
 						changeState(State::Connected);
+						postHandshake();
 					}
 				} else {
 					int ret = SSL_read(mSsl, buffer, bufferSize);
-					if (!check_openssl_ret(mSsl, ret))
+					if (!openssl::check(mSsl, ret))
 						break;
+
 					if (ret > 0)
 						recv(make_message(buffer, buffer + ret));
 				}
@@ -503,7 +447,7 @@ void DtlsTransport::runRecvLoop() {
 
 			// No more messages pending, retransmit and rearm timeout if connecting
 			std::optional<milliseconds> duration;
-			if (mState == State::Connecting) {
+			if (state() == State::Connecting) {
 				// Warning: This function breaks the usual return value convention
 				int ret = DTLSv1_handle_timeout(mSsl);
 				if (ret < 0) {
@@ -513,7 +457,7 @@ void DtlsTransport::runRecvLoop() {
 				}
 
 				struct timeval timeout = {};
-				if (mState == State::Connecting && DTLSv1_get_timeout(mSsl, &timeout)) {
+				if (state() == State::Connecting && DTLSv1_get_timeout(mSsl, &timeout)) {
 					duration = milliseconds(timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
 					// Also handle handshake timeout manually because OpenSSL actually doesn't...
 					// OpenSSL backs off exponentially in base 2 starting from the recommended 1s
@@ -534,8 +478,8 @@ void DtlsTransport::runRecvLoop() {
 		PLOG_ERROR << "DTLS recv: " << e.what();
 	}
 
-	if (mState == State::Connected) {
+	if (state() == State::Connected) {
-		PLOG_INFO << "DTLS disconnected";
+		PLOG_INFO << "DTLS closed";
 		changeState(State::Disconnected);
 		recv(nullptr);
 	} else {
@@ -551,7 +495,7 @@ int DtlsTransport::CertificateCallback(int preverify_ok, X509_STORE_CTX *ctx) {
 	    static_cast<DtlsTransport *>(SSL_get_ex_data(ssl, DtlsTransport::TransportExIndex));
 
 	X509 *crt = X509_STORE_CTX_get_current_cert(ctx);
-	std::string fingerprint = make_fingerprint(crt);
+	string fingerprint = make_fingerprint(crt);
 
 	return t->mVerifierCallback(fingerprint) ? 1 : 0;
 }
@@ -608,7 +552,7 @@ long DtlsTransport::BioMethodCtrl(BIO *bio, int cmd, long num, void *ptr) {
 	return 0;
 }
 
-} // namespace rtc
-
 #endif
 
+} // namespace rtc
+

src/dtlstransport.hpp

@@ -23,6 +23,7 @@
 #include "include.hpp"
 #include "peerconnection.hpp"
 #include "queue.hpp"
+#include "tls.hpp"
 #include "transport.hpp"
 
 #include <atomic>
@@ -31,12 +32,6 @@
 #include <mutex>
 #include <thread>
 
-#if USE_GNUTLS
-#include <gnutls/gnutls.h>
-#else
-#include <openssl/ssl.h>
-#endif
-
 namespace rtc {
 
 class IceTransport;
@@ -46,34 +41,27 @@ public:
 	static void Init();
 	static void Cleanup();
 
-	enum class State { Disconnected, Connecting, Connected, Failed };
-
 	using verifier_callback = std::function<bool(const std::string &fingerprint)>;
-	using state_callback = std::function<void(State state)>;
 
 	DtlsTransport(std::shared_ptr<IceTransport> lower, certificate_ptr certificate,
 	              verifier_callback verifierCallback, state_callback stateChangeCallback);
 	~DtlsTransport();
 
-	State state() const;
+	virtual bool stop() override;
+	virtual bool send(message_ptr message) override; // false if dropped
 
-	bool stop() override;
+protected:
-	bool send(message_ptr message) override; // false if dropped
+	virtual void incoming(message_ptr message) override;
-
+	virtual void postHandshake();
-private:
-	void incoming(message_ptr message) override;
-	void changeState(State state);
 	void runRecvLoop();
 
 	const certificate_ptr mCertificate;
+	const verifier_callback mVerifierCallback;
+	const bool mIsClient;
 
 	Queue<message_ptr> mIncomingQueue;
-	std::atomic<State> mState;
 	std::thread mRecvThread;
 
-	verifier_callback mVerifierCallback;
-	state_callback mStateChangeCallback;
-
 #if USE_GNUTLS
 	gnutls_session_t mSession;
 
@@ -82,8 +70,8 @@ private:
 	static ssize_t ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen);
 	static int TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms);
 #else
-	SSL_CTX *mCtx;
+	SSL_CTX *mCtx = NULL;
-	SSL *mSsl;
+	SSL *mSsl = NULL;
 	BIO *mInBio, *mOutBio;
 
 	static BIO_METHOD *BioMethods;

src/icetransport.cpp

@@ -48,9 +48,8 @@ namespace rtc {
 IceTransport::IceTransport(const Configuration &config, Description::Role role,
                            candidate_callback candidateCallback, state_callback stateChangeCallback,
                            gathering_state_callback gatheringStateChangeCallback)
-    : mRole(role), mMid("0"), mState(State::Disconnected), mGatheringState(GatheringState::New),
+    : Transport(nullptr, std::move(stateChangeCallback)), mRole(role), mMid("0"),
-      mCandidateCallback(std::move(candidateCallback)),
+      mGatheringState(GatheringState::New), mCandidateCallback(std::move(candidateCallback)),
-      mStateChangeCallback(std::move(stateChangeCallback)),
       mGatheringStateChangeCallback(std::move(gatheringStateChangeCallback)),
       mAgent(nullptr, nullptr) {
 
@@ -84,6 +83,7 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 			mStunService = server.service;
 			jconfig.stun_server_host = mStunHostname.c_str();
 			jconfig.stun_server_port = std::stoul(mStunService);
+			break;
 		}
 	}
 
@@ -100,7 +100,10 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 		throw std::runtime_error("Failed to create the ICE agent");
 }
 
-IceTransport::~IceTransport() { stop(); }
+IceTransport::~IceTransport() {
+	stop();
+	mAgent.reset();
+}
 
 bool IceTransport::stop() {
 	return Transport::stop();
@@ -108,8 +111,6 @@ bool IceTransport::stop() {
 
 Description::Role IceTransport::role() const { return mRole; }
 
-IceTransport::State IceTransport::state() const { return mState; }
-
 Description IceTransport::getLocalDescription(Description::Type type) const {
 	char sdp[JUICE_MAX_SDP_STRING_LEN];
 	if (juice_get_local_description(mAgent.get(), sdp, JUICE_MAX_SDP_STRING_LEN) < 0)
@@ -121,7 +122,7 @@ Description IceTransport::getLocalDescription(Description::Type type) const {
 void IceTransport::setRemoteDescription(const Description &description) {
 	mRole = description.role() == Description::Role::Active ? Description::Role::Passive
 	                                                        : Description::Role::Active;
-	mMid = description.mid();
+	mMid = description.dataMid();
 	if (juice_set_remote_description(mAgent.get(), string(description).c_str()) < 0)
 		throw std::runtime_error("Failed to parse remote SDP");
 }
@@ -161,7 +162,8 @@ std::optional<string> IceTransport::getRemoteAddress() const {
 }
 
 bool IceTransport::send(message_ptr message) {
-	if (!message || (mState != State::Connected && mState != State::Completed))
+	auto s = state();
+	if (!message || (s != State::Connected && s != State::Completed))
 		return false;
 
 	PLOG_VERBOSE << "Send size=" << message->size();
@@ -173,18 +175,29 @@ bool IceTransport::outgoing(message_ptr message) {
 	                  message->size()) >= 0;
 }
 
-void IceTransport::changeState(State state) {
-	if (mState.exchange(state) != state)
-		mStateChangeCallback(mState);
-}
-
 void IceTransport::changeGatheringState(GatheringState state) {
 	if (mGatheringState.exchange(state) != state)
 		mGatheringStateChangeCallback(mGatheringState);
 }
 
 void IceTransport::processStateChange(unsigned int state) {
-	changeState(static_cast<State>(state));
+	switch (state) {
+	case JUICE_STATE_DISCONNECTED:
+		changeState(State::Disconnected);
+		break;
+	case JUICE_STATE_CONNECTING:
+		changeState(State::Connecting);
+		break;
+	case JUICE_STATE_CONNECTED:
+		changeState(State::Connected);
+		break;
+	case JUICE_STATE_COMPLETED:
+		changeState(State::Completed);
+		break;
+	case JUICE_STATE_FAILED:
+		changeState(State::Failed);
+		break;
+	};
 }
 
 void IceTransport::processCandidate(const string &candidate) {
@@ -263,9 +276,8 @@ namespace rtc {
 IceTransport::IceTransport(const Configuration &config, Description::Role role,
                            candidate_callback candidateCallback, state_callback stateChangeCallback,
                            gathering_state_callback gatheringStateChangeCallback)
-    : mRole(role), mMid("0"), mState(State::Disconnected), mGatheringState(GatheringState::New),
+    : Transport(nullptr, std::move(stateChangeCallback)), mRole(role), mMid("0"),
-      mCandidateCallback(std::move(candidateCallback)),
+      mGatheringState(GatheringState::New), mCandidateCallback(std::move(candidateCallback)),
-      mStateChangeCallback(std::move(stateChangeCallback)),
       mGatheringStateChangeCallback(std::move(gatheringStateChangeCallback)),
       mNiceAgent(nullptr, nullptr), mMainLoop(nullptr, nullptr) {
 
@@ -457,8 +469,6 @@ bool IceTransport::stop() {
 
 Description::Role IceTransport::role() const { return mRole; }
 
-IceTransport::State IceTransport::state() const { return mState; }
-
 Description IceTransport::getLocalDescription(Description::Type type) const {
 	// RFC 8445: The initiating agent that started the ICE processing MUST take the controlling
 	// role, and the other MUST take the controlled role.
@@ -473,8 +483,8 @@ Description IceTransport::getLocalDescription(Description::Type type) const {
 void IceTransport::setRemoteDescription(const Description &description) {
 	mRole = description.role() == Description::Role::Active ? Description::Role::Passive
 	                                                        : Description::Role::Active;
-	mMid = description.mid();
+	mMid = description.dataMid();
-	mTrickleTimeout = description.trickleEnabled() ? 30s : 0s;
+	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)
@@ -529,7 +539,8 @@ std::optional<string> IceTransport::getRemoteAddress() const {
 }
 
 bool IceTransport::send(message_ptr message) {
-	if (!message || (mState != State::Connected && mState != State::Completed))
+	auto s = state();
+	if (!message || (s != State::Connected && s != State::Completed))
 		return false;
 
 	PLOG_VERBOSE << "Send size=" << message->size();
@@ -541,11 +552,6 @@ bool IceTransport::outgoing(message_ptr message) {
 	                       reinterpret_cast<const char *>(message->data())) >= 0;
 }
 
-void IceTransport::changeState(State state) {
-	if (mState.exchange(state) != state)
-		mStateChangeCallback(mState);
-}
-
 void IceTransport::changeGatheringState(GatheringState state) {
 	if (mGatheringState.exchange(state) != state)
 		mGatheringStateChangeCallback(mGatheringState);
@@ -576,7 +582,23 @@ void IceTransport::processStateChange(unsigned int state) {
 		mTimeoutId = 0;
 	}
 
-	changeState(static_cast<State>(state));
+	switch (state) {
+	case NICE_COMPONENT_STATE_DISCONNECTED:
+		changeState(State::Disconnected);
+		break;
+	case NICE_COMPONENT_STATE_CONNECTING:
+		changeState(State::Connecting);
+		break;
+	case NICE_COMPONENT_STATE_CONNECTED:
+		changeState(State::Connected);
+		break;
+	case NICE_COMPONENT_STATE_READY:
+		changeState(State::Completed);
+		break;
+	case NICE_COMPONENT_STATE_FAILED:
+		changeState(State::Failed);
+		break;
+	};
 }
 
 string IceTransport::AddressToString(const NiceAddress &addr) {

src/icetransport.hpp

@@ -40,29 +40,9 @@ namespace rtc {
 
 class IceTransport : public Transport {
 public:
-#if USE_JUICE
-	enum class State : unsigned int{
-	    Disconnected = JUICE_STATE_DISCONNECTED,
-	    Connecting = JUICE_STATE_CONNECTING,
-	    Connected = JUICE_STATE_CONNECTED,
-	    Completed = JUICE_STATE_COMPLETED,
-	    Failed = JUICE_STATE_FAILED,
-	};
-#else
-	enum class State : unsigned int {
-		Disconnected = NICE_COMPONENT_STATE_DISCONNECTED,
-		Connecting = NICE_COMPONENT_STATE_CONNECTING,
-		Connected = NICE_COMPONENT_STATE_CONNECTED,
-		Completed = NICE_COMPONENT_STATE_READY,
-		Failed = NICE_COMPONENT_STATE_FAILED,
-	};
-
-	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
-#endif
 	enum class GatheringState { New = 0, InProgress = 1, Complete = 2 };
 
 	using candidate_callback = std::function<void(const Candidate &candidate)>;
-	using state_callback = std::function<void(State state)>;
 	using gathering_state_callback = std::function<void(GatheringState state)>;
 
 	IceTransport(const Configuration &config, Description::Role role,
@@ -71,7 +51,6 @@ public:
 	~IceTransport();
 
 	Description::Role role() const;
-	State state() const;
 	GatheringState gatheringState() const;
 	Description getLocalDescription(Description::Type type) const;
 	void setRemoteDescription(const Description &description);
@@ -84,10 +63,13 @@ public:
 	bool stop() override;
 	bool send(message_ptr message) override; // false if dropped
 
+#if !USE_JUICE
+	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
+#endif
+
 private:
 	bool outgoing(message_ptr message) override;
 
-	void changeState(State state);
 	void changeGatheringState(GatheringState state);
 
 	void processStateChange(unsigned int state);
@@ -98,11 +80,9 @@ private:
 	Description::Role mRole;
 	string mMid;
 	std::chrono::milliseconds mTrickleTimeout;
-	std::atomic<State> mState;
 	std::atomic<GatheringState> mGatheringState;
 
 	candidate_callback mCandidateCallback;
-	state_callback mStateChangeCallback;
 	gathering_state_callback mGatheringStateChangeCallback;
 
 #if USE_JUICE

src/init.cpp

@@ -21,18 +21,20 @@
 #include "certificate.hpp"
 #include "dtlstransport.hpp"
 #include "sctptransport.hpp"
+#include "tls.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+#include "tlstransport.hpp"
+#endif
+
+#if RTC_ENABLE_MEDIA
+#include "dtlssrtptransport.hpp"
+#endif
 
 #ifdef _WIN32
 #include <winsock2.h>
 #endif
 
-#if USE_GNUTLS
-// Nothing to do
-#else
-#include <openssl/err.h>
-#include <openssl/ssl.h>
-#endif
-
 using std::shared_ptr;
 
 namespace rtc {
@@ -65,19 +67,29 @@ Init::Init() {
 #if USE_GNUTLS
 		// Nothing to do
 #else
-	OPENSSL_init_ssl(0, NULL);
+	openssl::init();
-	SSL_load_error_strings();
-	ERR_load_crypto_strings();
 #endif
 
-	DtlsTransport::Init();
 	SctpTransport::Init();
+	DtlsTransport::Init();
+#if RTC_ENABLE_WEBSOCKET
+	TlsTransport::Init();
+#endif
+#if RTC_ENABLE_MEDIA
+	DtlsSrtpTransport::Init();
+#endif
 }
 
 Init::~Init() {
 	CleanupCertificateCache();
-	DtlsTransport::Cleanup();
 	SctpTransport::Cleanup();
+	DtlsTransport::Cleanup();
+#if RTC_ENABLE_WEBSOCKET
+	TlsTransport::Cleanup();
+#endif
+#if RTC_ENABLE_MEDIA
+	DtlsSrtpTransport::Cleanup();
+#endif
 
 #ifdef _WIN32
 	WSACleanup();

src/peerconnection.cpp

@@ -23,7 +23,10 @@
 #include "include.hpp"
 #include "sctptransport.hpp"
 
-#include <iostream>
+#if RTC_ENABLE_MEDIA
+#include "dtlssrtptransport.hpp"
+#endif
+
 #include <thread>
 
 namespace rtc {
@@ -33,32 +36,21 @@ using namespace std::placeholders;
 using std::shared_ptr;
 using std::weak_ptr;
 
-template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t, Args &&... _args) {
-	return [bound = std::bind(f, t, _args...), weak_this = t->weak_from_this()](auto &&... args) {
-		if (auto shared_this = weak_this.lock())
-			bound(args...);
-	};
-}
-
-template <typename F, typename T, typename... Args>
-auto weak_bind_verifier(F &&f, T *t, Args &&... _args) {
-	return [bound = std::bind(f, t, _args...), weak_this = t->weak_from_this()](auto &&... args) {
-		if (auto shared_this = weak_this.lock())
-			return bound(args...);
-		else
-			return false;
-	};
-}
-
 PeerConnection::PeerConnection() : PeerConnection(Configuration()) {}
 
 PeerConnection::PeerConnection(const Configuration &config)
     : mConfig(config), mCertificate(make_certificate("libdatachannel")), mState(State::New),
-      mGatheringState(GatheringState::New) {}
+      mGatheringState(GatheringState::New) {
+	PLOG_VERBOSE << "Creating PeerConnection";
+}
 
-PeerConnection::~PeerConnection() { close(); }
+PeerConnection::~PeerConnection() {
+	close();
+	PLOG_VERBOSE << "Destroying PeerConnection";
+}
 
 void PeerConnection::close() {
+	PLOG_VERBOSE << "Closing PeerConnection";
 	closeDataChannels();
 	closeTransports();
 }
@@ -79,6 +71,22 @@ std::optional<Description> PeerConnection::remoteDescription() const {
 	return mRemoteDescription;
 }
 
+void PeerConnection::setLocalDescription(std::optional<Description> description) {
+	if (auto iceTransport = std::atomic_load(&mIceTransport)) {
+		throw std::logic_error("Local description is already set");
+	} else {
+		// 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
+		iceTransport = initIceTransport(Description::Role::ActPass);
+		Description localDescription = iceTransport->getLocalDescription(Description::Type::Offer);
+		if (description)
+			localDescription.addMedia(*description);
+		processLocalDescription(localDescription);
+		iceTransport->gatherLocalCandidates();
+	}
+}
+
 void PeerConnection::setRemoteDescription(Description description) {
 	description.hintType(localDescription() ? Description::Type::Answer : Description::Type::Offer);
 	auto remoteCandidates = description.extractCandidates();
@@ -94,7 +102,9 @@ void PeerConnection::setRemoteDescription(Description description) {
 
 	if (mRemoteDescription->type() == Description::Type::Offer) {
 		// This is an offer and we are the answerer.
-		processLocalDescription(iceTransport->getLocalDescription(Description::Type::Answer));
+		Description localDescription = iceTransport->getLocalDescription(Description::Type::Answer);
+		localDescription.addMedia(description); // blindly accept media
+		processLocalDescription(localDescription);
 		iceTransport->gatherLocalCandidates();
 	} else {
 		// This is an answer and we are the offerer.
@@ -202,6 +212,39 @@ void PeerConnection::onGatheringStateChange(std::function<void(GatheringState st
 	mGatheringStateChangeCallback = callback;
 }
 
+bool PeerConnection::hasMedia() const {
+	auto local = localDescription();
+	auto remote = remoteDescription();
+	return (local && local->hasMedia()) || (remote && remote->hasMedia());
+}
+
+void PeerConnection::sendMedia(const binary &packet) {
+	outgoingMedia(make_message(packet.begin(), packet.end(), Message::Binary));
+}
+
+void PeerConnection::send(const byte *packet, size_t size) {
+	outgoingMedia(make_message(packet, packet + size, Message::Binary));
+}
+
+void PeerConnection::onMedia(std::function<void(const binary &packet)> callback) {
+	mMediaCallback = callback;
+}
+
+void PeerConnection::outgoingMedia(message_ptr message) {
+	if (!hasMedia())
+		throw std::runtime_error("PeerConnection has no media support");
+
+#if RTC_ENABLE_MEDIA
+	auto transport = std::atomic_load(&mDtlsTransport);
+	if (!transport)
+		throw std::runtime_error("PeerConnection is not open");
+
+	std::dynamic_pointer_cast<DtlsSrtpTransport>(transport)->send(message);
+#else
+	PLOG_WARNING << "Ignoring sent media (not compiled with SRTP support)";
+#endif
+}
+
 shared_ptr<IceTransport> PeerConnection::initIceTransport(Description::Role role) {
 	try {
 		if (auto transport = std::atomic_load(&mIceTransport))
@@ -271,27 +314,48 @@ shared_ptr<DtlsTransport> PeerConnection::initDtlsTransport() {
 
 		auto certificate = mCertificate.get();
 		auto lower = std::atomic_load(&mIceTransport);
-		auto transport = std::make_shared<DtlsTransport>(
+		auto verifierCallback = weak_bind(&PeerConnection::checkFingerprint, this, _1);
-		    lower, certificate, weak_bind_verifier(&PeerConnection::checkFingerprint, this, _1),
+		auto stateChangeCallback = [this,
-		    [this, weak_this = weak_from_this()](DtlsTransport::State state) {
+		                            weak_this = weak_from_this()](DtlsTransport::State state) {
-			    auto shared_this = weak_this.lock();
+			auto shared_this = weak_this.lock();
-			    if (!shared_this)
+			if (!shared_this)
-				    return;
+				return;
-			    switch (state) {
+
-			    case DtlsTransport::State::Connected:
+			switch (state) {
-				    initSctpTransport();
+			case DtlsTransport::State::Connected:
-				    break;
+				initSctpTransport();
-			    case DtlsTransport::State::Failed:
+				break;
-				    changeState(State::Failed);
+			case DtlsTransport::State::Failed:
-				    break;
+				changeState(State::Failed);
-			    case DtlsTransport::State::Disconnected:
+				break;
-				    changeState(State::Disconnected);
+			case DtlsTransport::State::Disconnected:
-				    break;
+				changeState(State::Disconnected);
-			    default:
+				break;
-				    // Ignore
+			default:
-				    break;
+				// Ignore
-			    }
+				break;
-		    });
+			}
+		};
+
+		shared_ptr<DtlsTransport> transport;
+		if (hasMedia()) {
+#if RTC_ENABLE_MEDIA
+			PLOG_INFO << "This connection requires media support";
+
+			// DTLS-SRTP
+			transport = std::make_shared<DtlsSrtpTransport>(
+			    lower, certificate, verifierCallback,
+			    std::bind(&PeerConnection::forwardMedia, this, _1), stateChangeCallback);
+#else
+			PLOG_WARNING << "Ignoring media support (not compiled with SRTP support)";
+#endif
+		}
+
+		if (!transport) {
+			// DTLS only
+			transport = std::make_shared<DtlsTransport>(lower, certificate, verifierCallback,
+			                                            stateChangeCallback);
+		}
 
 		std::atomic_store(&mDtlsTransport, transport);
 		if (mState == State::Closed) {
@@ -328,8 +392,15 @@ shared_ptr<SctpTransport> PeerConnection::initSctpTransport() {
 				    openDataChannels();
 				    break;
 			    case SctpTransport::State::Failed:
+				    LOG_WARNING << "SCTP transport failed";
 				    remoteCloseDataChannels();
+#if RTC_ENABLE_MEDIA
+				    // Ignore SCTP failure if media is present
+				    if (!hasMedia())
+					    changeState(State::Failed);
+#else
 				    changeState(State::Failed);
+#endif
 				    break;
 			    case SctpTransport::State::Disconnected:
 				    remoteCloseDataChannels();
@@ -357,6 +428,8 @@ shared_ptr<SctpTransport> PeerConnection::initSctpTransport() {
 }
 
 void PeerConnection::closeTransports() {
+	PLOG_VERBOSE << "Closing transports";
+
 	// Change state to sink state Closed to block init methods
 	changeState(State::Closed);
 
@@ -368,7 +441,7 @@ void PeerConnection::closeTransports() {
 	auto dtls = std::atomic_exchange(&mDtlsTransport, decltype(mDtlsTransport)(nullptr));
 	auto ice = std::atomic_exchange(&mIceTransport, decltype(mIceTransport)(nullptr));
 	if (sctp || dtls || ice) {
-		std::thread t([sctp, dtls, ice]() mutable {
+		std::thread t([sctp, dtls, ice, token = mInitToken]() mutable {
 			if (sctp)
 				sctp->stop();
 			if (dtls)
@@ -432,6 +505,11 @@ void PeerConnection::forwardMessage(message_ptr message) {
 	channel->incoming(message);
 }
 
+void PeerConnection::forwardMedia(message_ptr message) {
+	if (message)
+		mMediaCallback(*message);
+}
+
 void PeerConnection::forwardBufferedAmount(uint16_t stream, size_t amount) {
 	if (auto channel = findDataChannel(stream))
 		channel->triggerBufferedAmount(amount);

src/rtc.cpp

@@ -16,10 +16,15 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "datachannel.hpp"
 #include "include.hpp"
+
+#include "datachannel.hpp"
 #include "peerconnection.hpp"
 
+#if RTC_ENABLE_WEBSOCKET
+#include "websocket.hpp"
+#endif
+
 #include <rtc.h>
 
 #include <exception>
@@ -43,6 +48,9 @@ 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;
@@ -103,6 +111,40 @@ bool eraseDataChannel(int 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)); }
@@ -164,6 +206,31 @@ int rtcDeleteDataChannel(int 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)
@@ -298,135 +365,135 @@ int rtcGetDataChannelLabel(int dc, char *buffer, int size) {
 	return size + 1;
 }
 
-int rtcSetOpenCallback(int dc, openCallbackFunc cb) {
+int rtcSetOpenCallback(int id, openCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onOpen([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onOpen(nullptr);
+		channel->onOpen(nullptr);
 	return 0;
 }
 
-int rtcSetClosedCallback(int dc, closedCallbackFunc cb) {
+int rtcSetClosedCallback(int id, closedCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onClosed([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onClosed([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onClosed(nullptr);
+		channel->onClosed(nullptr);
 	return 0;
 }
 
-int rtcSetErrorCallback(int dc, errorCallbackFunc cb) {
+int rtcSetErrorCallback(int id, errorCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onError(
+		channel->onError([id, cb](const string &error) { cb(error.c_str(), getUserPointer(id)); });
-		    [dc, cb](const string &error) { cb(error.c_str(), getUserPointer(dc)); });
 	else
-		dataChannel->onError(nullptr);
+		channel->onError(nullptr);
 	return 0;
 }
 
-int rtcSetMessageCallback(int dc, messageCallbackFunc cb) {
+int rtcSetMessageCallback(int id, messageCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onMessage(
+		channel->onMessage(
-		    [dc, cb](const binary &b) {
+		    [id, cb](const binary &b) {
-			    cb(reinterpret_cast<const char *>(b.data()), b.size(), getUserPointer(dc));
+			    cb(reinterpret_cast<const char *>(b.data()), b.size(), getUserPointer(id));
 		    },
-		    [dc, cb](const string &s) { cb(s.c_str(), -1, getUserPointer(dc)); });
+		    [id, cb](const string &s) { cb(s.c_str(), -1, getUserPointer(id)); });
 	else
-		dataChannel->onMessage(nullptr);
+		channel->onMessage(nullptr);
 
 	return 0;
 }
 
-int rtcSendMessage(int dc, const char *data, int size) {
+int rtcSendMessage(int id, const char *data, int size) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (size >= 0) {
 		auto b = reinterpret_cast<const byte *>(data);
-		CATCH(dataChannel->send(b, size));
+		CATCH(channel->send(binary(b, b + size)));
 		return size;
 	} else {
-		string s(data);
+		string str(data);
-		CATCH(dataChannel->send(s));
+		int len = str.size();
-		return s.size();
+		CATCH(channel->send(std::move(str)));
+		return len;
 	}
 }
 
-int rtcGetBufferedAmount(int dc) {
+int rtcGetBufferedAmount(int id) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
-	CATCH(return int(dataChannel->bufferedAmount()));
+	CATCH(return int(channel->bufferedAmount()));
 }
 
-int rtcSetBufferedAmountLowThreshold(int dc, int amount) {
+int rtcSetBufferedAmountLowThreshold(int id, int amount) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
-	CATCH(dataChannel->setBufferedAmountLowThreshold(size_t(amount)));
+	CATCH(channel->setBufferedAmountLowThreshold(size_t(amount)));
 	return 0;
 }
 
-int rtcSetBufferedAmountLowCallback(int dc, bufferedAmountLowCallbackFunc cb) {
+int rtcSetBufferedAmountLowCallback(int id, bufferedAmountLowCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onBufferedAmountLow([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onBufferedAmountLow([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onBufferedAmountLow(nullptr);
+		channel->onBufferedAmountLow(nullptr);
 	return 0;
 }
 
-int rtcGetAvailableAmount(int dc) {
+int rtcGetAvailableAmount(int id) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
-	CATCH(return int(dataChannel->availableAmount()));
+	CATCH(return int(channel->availableAmount()));
 }
 
-int rtcSetAvailableCallback(int dc, availableCallbackFunc cb) {
+int rtcSetAvailableCallback(int id, availableCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onOpen([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onOpen(nullptr);
+		channel->onOpen(nullptr);
 	return 0;
 }
 
-int rtcReceiveMessage(int dc, char *buffer, int *size) {
+int rtcReceiveMessage(int id, char *buffer, int *size) {
-	auto dataChannel = getDataChannel(dc);
+	auto channel = getChannel(id);
-	if (!dataChannel)
+	if (!channel)
 		return -1;
 
 	if (!size)
 		return -1;
 
 	CATCH({
-		auto message = dataChannel->receive();
+		auto message = channel->receive();
 		if (!message)
 			return 0;
 

src/sctptransport.cpp

@@ -71,9 +71,8 @@ void SctpTransport::Cleanup() {
 SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
                              message_callback recvCallback, amount_callback bufferedAmountCallback,
                              state_callback stateChangeCallback)
-    : Transport(lower), mPort(port), mSendQueue(0, message_size_func),
+    : Transport(lower, std::move(stateChangeCallback)), mPort(port),
-      mBufferedAmountCallback(std::move(bufferedAmountCallback)),
+      mSendQueue(0, message_size_func), mBufferedAmountCallback(std::move(bufferedAmountCallback)) {
-      mStateChangeCallback(std::move(stateChangeCallback)), mState(State::Disconnected) {
 	onRecv(recvCallback);
 
 	PLOG_DEBUG << "Initializing SCTP transport";
@@ -180,8 +179,6 @@ SctpTransport::~SctpTransport() {
 	usrsctp_deregister_address(this);
 }
 
-SctpTransport::State SctpTransport::state() const { return mState; }
-
 bool SctpTransport::stop() {
 	if (!Transport::stop())
 		return false;
@@ -240,6 +237,7 @@ void SctpTransport::shutdown() {
 
 bool SctpTransport::send(message_ptr message) {
 	std::lock_guard lock(mSendMutex);
+
 	if (!message)
 		return mSendQueue.empty();
 
@@ -269,7 +267,7 @@ void SctpTransport::incoming(message_ptr message) {
 	// to be sent on our side (i.e. the local INIT) before proceeding.
 	{
 		std::unique_lock lock(mWriteMutex);
-		mWrittenCondition.wait(lock, [&]() { return mWrittenOnce || mState != State::Connected; });
+		mWrittenCondition.wait(lock, [&]() { return mWrittenOnce || state() != State::Connected; });
 	}
 
 	if (!message) {
@@ -283,11 +281,6 @@ void SctpTransport::incoming(message_ptr message) {
 	usrsctp_conninput(this, message->data(), message->size(), 0);
 }
 
-void SctpTransport::changeState(State state) {
-	if (mState.exchange(state) != state)
-		mStateChangeCallback(state);
-}
-
 bool SctpTransport::trySendQueue() {
 	// Requires mSendMutex to be locked
 	while (auto next = mSendQueue.peek()) {
@@ -302,7 +295,7 @@ bool SctpTransport::trySendQueue() {
 
 bool SctpTransport::trySendMessage(message_ptr message) {
 	// Requires mSendMutex to be locked
-	if (!mSock || mState != State::Connected)
+	if (!mSock || state() != State::Connected)
 		return false;
 
 	uint32_t ppid;
@@ -414,7 +407,7 @@ void SctpTransport::sendReset(uint16_t streamId) {
 	if (usrsctp_setsockopt(mSock, IPPROTO_SCTP, SCTP_RESET_STREAMS, &srs, len) == 0) {
 		std::unique_lock lock(mWriteMutex); // locking before setsockopt might deadlock usrsctp...
 		mWrittenCondition.wait_for(lock, 1000ms,
-		                           [&]() { return mWritten || mState != State::Connected; });
+		                           [&]() { return mWritten || state() != State::Connected; });
 	} else if (errno == EINVAL) {
 		PLOG_VERBOSE << "SCTP stream " << streamId << " already reset";
 	} else {
@@ -571,7 +564,7 @@ void SctpTransport::processNotification(const union sctp_notification *notify, s
 			PLOG_INFO << "SCTP connected";
 			changeState(State::Connected);
 		} else {
-			if (mState == State::Connecting) {
+			if (state() == State::Connecting) {
 				PLOG_ERROR << "SCTP connection failed";
 				changeState(State::Failed);
 			} else {

src/sctptransport.hpp

@@ -38,17 +38,12 @@ public:
 	static void Init();
 	static void Cleanup();
 
-	enum class State { Disconnected, Connecting, Connected, Failed };
-
 	using amount_callback = std::function<void(uint16_t streamId, size_t amount)>;
-	using state_callback = std::function<void(State state)>;
 
 	SctpTransport(std::shared_ptr<Transport> lower, uint16_t port, message_callback recvCallback,
 	              amount_callback bufferedAmountCallback, state_callback stateChangeCallback);
 	~SctpTransport();
 
-	State state() const;
-
 	bool stop() override;
 	bool send(message_ptr message) override; // false if buffered
 	void close(unsigned int stream);
@@ -76,7 +71,6 @@ private:
 	void connect();
 	void shutdown();
 	void incoming(message_ptr message) override;
-	void changeState(State state);
 
 	bool trySendQueue();
 	bool trySendMessage(message_ptr message);
@@ -105,14 +99,11 @@ private:
 	std::atomic<bool> mWritten = false; // written outside lock
 	bool mWrittenOnce = false;
 
-	state_callback mStateChangeCallback;
+	binary mPartialRecv, mPartialStringData, mPartialBinaryData;
-	std::atomic<State> mState;
 
 	// Stats
 	std::atomic<size_t> mBytesSent = 0, mBytesReceived = 0;
 
-	binary mPartialRecv, mPartialStringData, mPartialBinaryData;
-
 	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);

src/tcptransport.cpp

@@ -0,0 +1,378 @@
+/**
+ * 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 "tcptransport.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include <exception>
+#ifndef _WIN32
+#include <fcntl.h>
+#include <unistd.h>
+#endif
+
+namespace rtc {
+
+using std::to_string;
+
+SelectInterrupter::SelectInterrupter() {
+#ifndef _WIN32
+	int pipefd[2];
+	if (::pipe(pipefd) != 0)
+		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
+#endif
+}
+
+SelectInterrupter::~SelectInterrupter() {
+	std::lock_guard lock(mMutex);
+#ifdef _WIN32
+	if (mDummySock != INVALID_SOCKET)
+		::closesocket(mDummySock);
+#else
+	::close(mPipeIn);
+	::close(mPipeOut);
+#endif
+}
+
+int SelectInterrupter::prepare(fd_set &readfds, 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;
+#else
+	int ret;
+	do {
+		char dummy;
+		ret = ::read(mPipeIn, &dummy, 1);
+	} while (ret > 0);
+	FD_SET(mPipeIn, &readfds);
+	return mPipeIn + 1;
+#endif
+}
+
+void SelectInterrupter::interrupt() {
+	std::lock_guard lock(mMutex);
+#ifdef _WIN32
+	if (mDummySock != INVALID_SOCKET) {
+		::closesocket(mDummySock);
+		mDummySock = INVALID_SOCKET;
+	}
+#else
+	char dummy = 0;
+	::write(mPipeOut, &dummy, 1);
+#endif
+}
+
+TcpTransport::TcpTransport(const string &hostname, const string &service, state_callback callback)
+    : Transport(nullptr, std::move(callback)), mHostname(hostname), mService(service) {
+
+	PLOG_DEBUG << "Initializing TCP transport";
+	mThread = std::thread(&TcpTransport::runLoop, this);
+}
+
+TcpTransport::~TcpTransport() {
+	stop();
+}
+
+bool TcpTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Waiting for TCP recv thread";
+	close();
+	mThread.join();
+	return true;
+}
+
+bool TcpTransport::send(message_ptr message) {
+	if (state() != State::Connected)
+		return false;
+
+	if (!message)
+		return mSendQueue.empty();
+
+	PLOG_VERBOSE << "Send size=" << (message ? message->size() : 0);
+	return outgoing(message);
+}
+
+void TcpTransport::incoming(message_ptr message) {
+	if (!message)
+		return;
+
+	PLOG_VERBOSE << "Incoming size=" << message->size();
+	recv(message);
+}
+
+bool TcpTransport::outgoing(message_ptr message) {
+	// 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))
+		return true;
+
+	mSendQueue.push(message);
+	interruptSelect(); // so the thread waits for writability
+	return false;
+}
+
+void TcpTransport::connect(const string &hostname, const string &service) {
+	PLOG_DEBUG << "Connecting to " << hostname << ":" << service;
+
+	struct addrinfo hints = {};
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+	hints.ai_protocol = IPPROTO_TCP;
+	hints.ai_flags = AI_ADDRCONFIG;
+
+	struct addrinfo *result = nullptr;
+	if (getaddrinfo(hostname.c_str(), service.c_str(), &hints, &result))
+		throw std::runtime_error("Resolution failed for \"" + hostname + ":" + service + "\"");
+
+	for (auto p = result; p; p = p->ai_next) {
+		try {
+			connect(p->ai_addr, p->ai_addrlen);
+
+			PLOG_INFO << "Connected to " << hostname << ":" << service;
+			freeaddrinfo(result);
+			return;
+
+		} catch (const std::runtime_error &e) {
+			if (p->ai_next) {
+				PLOG_DEBUG << e.what();
+			} else {
+				PLOG_WARNING << e.what();
+			}
+		}
+	}
+
+	freeaddrinfo(result);
+
+	std::ostringstream msg;
+	msg << "Connection to " << hostname << ":" << service << " failed";
+	throw std::runtime_error(msg.str());
+}
+
+void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
+	try {
+		char node[MAX_NUMERICNODE_LEN];
+		char serv[MAX_NUMERICSERV_LEN];
+		if (getnameinfo(addr, addrlen, node, MAX_NUMERICNODE_LEN, serv, MAX_NUMERICSERV_LEN,
+		                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+			PLOG_DEBUG << "Trying address " << node << ":" << serv;
+		}
+
+		PLOG_VERBOSE << "Creating TCP socket";
+
+		// Create socket
+		mSock = ::socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
+		if (mSock == INVALID_SOCKET)
+			throw std::runtime_error("TCP socket creation failed");
+
+		ctl_t b = 1;
+		if (::ioctlsocket(mSock, FIONBIO, &b) < 0)
+			throw std::runtime_error("Failed to set socket non-blocking mode");
+
+#ifdef __APPLE__
+		// MacOS lacks MSG_NOSIGNAL and requires SO_NOSIGPIPE instead
+		int opt = 1;
+		if (::setsockopt(mSock, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt)) < 0)
+			throw std::runtime_error("Failed to disable SIGPIPE for socket");
+#endif
+
+		// Initiate connection
+		int ret = ::connect(mSock, addr, addrlen);
+		if (ret < 0 && errno != EINPROGRESS) {
+			std::ostringstream msg;
+			msg << "TCP connection to " << node << ":" << serv << " failed, errno=" << sockerrno;
+			throw std::runtime_error(msg.str());
+		}
+
+		fd_set writefds;
+		FD_ZERO(&writefds);
+		FD_SET(mSock, &writefds);
+		struct timeval tv;
+		tv.tv_sec = 10; // TODO
+		tv.tv_usec = 0;
+		ret = ::select(SOCKET_TO_INT(mSock) + 1, NULL, &writefds, NULL, &tv);
+
+		if (ret < 0)
+			throw std::runtime_error("Failed to wait for socket connection");
+
+		if (ret == 0) {
+			std::ostringstream msg;
+			msg << "TCP connection to " << node << ":" << serv << " timed out";
+			throw std::runtime_error(msg.str());
+		}
+
+		int error = 0;
+		socklen_t errorlen = sizeof(error);
+		if (::getsockopt(mSock, SOL_SOCKET, SO_ERROR, &error, &errorlen) != 0)
+			throw std::runtime_error("Failed to get socket error code");
+
+		if (error != 0) {
+			std::ostringstream msg;
+			msg << "TCP connection to " << node << ":" << serv << " failed, errno=" << error;
+			throw std::runtime_error(msg.str());
+		}
+
+		PLOG_DEBUG << "TCP connection to " << node << ":" << serv << " succeeded";
+
+	} catch (...) {
+		if (mSock != INVALID_SOCKET) {
+			::closesocket(mSock);
+			mSock = INVALID_SOCKET;
+		}
+		throw;
+	}
+}
+
+void TcpTransport::close() {
+	if (mSock != INVALID_SOCKET) {
+		PLOG_DEBUG << "Closing TCP socket";
+		::closesocket(mSock);
+		mSock = INVALID_SOCKET;
+	}
+	changeState(State::Disconnected);
+}
+
+bool TcpTransport::trySendQueue() {
+	while (auto next = mSendQueue.peek()) {
+		auto message = *next;
+		if (!trySendMessage(message)) {
+			mSendQueue.exchange(message);
+			return false;
+		}
+		mSendQueue.pop();
+	}
+	return true;
+}
+
+bool TcpTransport::trySendMessage(message_ptr &message) {
+	auto data = reinterpret_cast<const char *>(message->data());
+	auto size = message->size();
+	while (size) {
+#ifdef __APPLE__
+		int flags = 0;
+#else
+		int flags = MSG_NOSIGNAL;
+#endif
+		int len = ::send(mSock, data, size, flags);
+		if (len < 0) {
+			if (errno == EAGAIN || errno == EWOULDBLOCK) {
+				message = make_message(message->end() - size, message->end());
+				return false;
+			} else {
+				throw std::runtime_error("Connection lost, errno=" + to_string(sockerrno));
+			}
+		}
+
+		data += len;
+		size -= len;
+	}
+	message = nullptr;
+	return true;
+}
+
+void TcpTransport::runLoop() {
+	const size_t bufferSize = 4096;
+
+	// Connect
+	try {
+		changeState(State::Connecting);
+		connect(mHostname, mService);
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TCP connect: " << e.what();
+		changeState(State::Failed);
+		return;
+	}
+
+	// Receive loop
+	try {
+		PLOG_INFO << "TCP connected";
+		changeState(State::Connected);
+
+		while (true) {
+			fd_set readfds, writefds;
+			int n = prepareSelect(readfds, writefds);
+
+			struct timeval tv;
+			tv.tv_sec = 10;
+			tv.tv_usec = 0;
+			int ret = ::select(n, &readfds, &writefds, NULL, &tv);
+			if (ret < 0) {
+				throw std::runtime_error("Failed to wait on socket");
+			} else if (ret == 0) {
+				PLOG_VERBOSE << "TCP is idle";
+				incoming(make_message(0));
+				continue;
+			}
+
+			if (FD_ISSET(mSock, &writefds))
+				trySendQueue();
+
+			if (FD_ISSET(mSock, &readfds)) {
+				char buffer[bufferSize];
+				int len = ::recv(mSock, buffer, bufferSize, 0);
+				if (len < 0) {
+					if (errno == EAGAIN || errno == EWOULDBLOCK) {
+						continue;
+					} else {
+						throw std::runtime_error("Connection lost");
+					}
+				}
+
+				if (len == 0)
+					break; // clean close
+
+				auto *b = reinterpret_cast<byte *>(buffer);
+				incoming(make_message(b, b + len));
+			}
+		}
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TCP recv: " << e.what();
+	}
+
+	PLOG_INFO << "TCP disconnected";
+	changeState(State::Disconnected);
+	recv(nullptr);
+}
+
+int TcpTransport::prepareSelect(fd_set &readfds, fd_set &writefds) {
+	FD_ZERO(&readfds);
+	FD_ZERO(&writefds);
+	FD_SET(mSock, &readfds);
+
+	if (!mSendQueue.empty())
+		FD_SET(mSock, &writefds);
+
+	int n = SOCKET_TO_INT(mSock) + 1;
+	int m = mInterrupter.prepare(readfds, writefds);
+	return std::max(n, m);
+}
+
+void TcpTransport::interruptSelect() { mInterrupter.interrupt(); }
+
+} // namespace rtc
+
+#endif

src/tcptransport.hpp

@@ -0,0 +1,90 @@
+/**
+ * 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_TCP_TRANSPORT_H
+#define RTC_TCP_TRANSPORT_H
+
+#include "include.hpp"
+#include "queue.hpp"
+#include "transport.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include <mutex>
+#include <thread>
+
+// Use the socket defines from libjuice
+#include "../deps/libjuice/src/socket.h"
+
+namespace rtc {
+
+// Utility class to interrupt select()
+class SelectInterrupter {
+public:
+	SelectInterrupter();
+	~SelectInterrupter();
+
+	int prepare(fd_set &readfds, fd_set &writefds);
+	void interrupt();
+
+private:
+	std::mutex mMutex;
+#ifdef _WIN32
+	socket_t mDummySock = INVALID_SOCKET;
+#else // assume POSIX
+	int mPipeIn, mPipeOut;
+#endif
+};
+
+class TcpTransport : public Transport {
+public:
+	TcpTransport(const string &hostname, const string &service, state_callback callback);
+	~TcpTransport();
+
+	bool stop() override;
+	bool send(message_ptr message) override;
+
+	void incoming(message_ptr message) override;
+	bool outgoing(message_ptr message) override;
+
+private:
+	void connect(const string &hostname, const string &service);
+	void connect(const sockaddr *addr, socklen_t addrlen);
+	void close();
+
+	bool trySendQueue();
+	bool trySendMessage(message_ptr &message);
+
+	void runLoop();
+
+	int prepareSelect(fd_set &readfds, fd_set &writefds);
+	void interruptSelect();
+
+	string mHostname, mService;
+
+	socket_t mSock = INVALID_SOCKET;
+	std::thread mThread;
+	SelectInterrupter mInterrupter;
+	Queue<message_ptr> mSendQueue;
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/tls.cpp

@@ -0,0 +1,132 @@
+/**
+ * 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 "tls.hpp"
+
+#if USE_GNUTLS
+
+namespace rtc::gnutls {
+
+bool check(int ret, const string &message) {
+	if (ret < 0) {
+		if (!gnutls_error_is_fatal(ret)) {
+			PLOG_INFO << gnutls_strerror(ret);
+			return false;
+		}
+		PLOG_ERROR << message << ": " << gnutls_strerror(ret);
+		throw std::runtime_error(message + ": " + gnutls_strerror(ret));
+	}
+	return true;
+}
+
+gnutls_certificate_credentials_t *new_credentials() {
+	auto creds = new gnutls_certificate_credentials_t;
+	gnutls::check(gnutls_certificate_allocate_credentials(creds));
+	return creds;
+}
+
+void free_credentials(gnutls_certificate_credentials_t *creds) {
+	gnutls_certificate_free_credentials(*creds);
+	delete creds;
+}
+
+gnutls_x509_crt_t *new_crt() {
+	auto crt = new gnutls_x509_crt_t;
+	gnutls::check(gnutls_x509_crt_init(crt));
+	return crt;
+}
+
+void free_crt(gnutls_x509_crt_t *crt) {
+	gnutls_x509_crt_deinit(*crt);
+	delete crt;
+}
+
+gnutls_x509_privkey_t *new_privkey() {
+	auto privkey = new gnutls_x509_privkey_t;
+	gnutls::check(gnutls_x509_privkey_init(privkey));
+	return privkey;
+}
+
+void free_privkey(gnutls_x509_privkey_t *privkey) {
+	gnutls_x509_privkey_deinit(*privkey);
+	delete privkey;
+}
+
+gnutls_datum_t make_datum(char *data, size_t size) {
+	gnutls_datum_t datum;
+	datum.data = reinterpret_cast<unsigned char *>(data);
+	datum.size = size;
+	return datum;
+}
+
+} // namespace rtc::gnutls
+
+#else // USE_GNUTLS==0
+
+namespace rtc::openssl {
+
+void init() {
+	static std::mutex mutex;
+	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;
+	}
+}
+
+string error_string(unsigned long err) {
+	const size_t bufferSize = 256;
+	char buffer[bufferSize];
+	ERR_error_string_n(err, buffer, bufferSize);
+	return string(buffer);
+}
+
+bool check(int success, const string &message) {
+	if (success)
+		return true;
+
+	string str = error_string(ERR_get_error());
+	PLOG_ERROR << message << ": " << str;
+	throw std::runtime_error(message + ": " + str);
+}
+
+bool check(SSL *ssl, int ret, const string &message) {
+	if (ret == BIO_EOF)
+		return true;
+
+	unsigned long err = SSL_get_error(ssl, ret);
+	if (err == SSL_ERROR_NONE || err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
+		return true;
+	}
+	if (err == SSL_ERROR_ZERO_RETURN) {
+		PLOG_DEBUG << "DTLS connection cleanly closed";
+		return false;
+	}
+	string str = error_string(err);
+	PLOG_ERROR << str;
+	throw std::runtime_error(message + ": " + str);
+}
+
+} // namespace rtc::openssl
+
+#endif
+

src/tls.hpp

@@ -0,0 +1,75 @@
+/**
+ * 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
+ */
+
+#ifndef RTC_TLS_H
+#define RTC_TLS_H
+
+#include "include.hpp"
+
+#if USE_GNUTLS
+
+#include <gnutls/gnutls.h>
+
+#include <gnutls/crypto.h>
+#include <gnutls/dtls.h>
+#include <gnutls/x509.h>
+
+namespace rtc::gnutls {
+
+bool check(int ret, const string &message = "GnuTLS error");
+
+gnutls_certificate_credentials_t *new_credentials();
+void free_credentials(gnutls_certificate_credentials_t *creds);
+
+gnutls_x509_crt_t *new_crt();
+void free_crt(gnutls_x509_crt_t *crt);
+
+gnutls_x509_privkey_t *new_privkey();
+void free_privkey(gnutls_x509_privkey_t *privkey);
+
+gnutls_datum_t make_datum(char *data, size_t size);
+
+} // namespace rtc::gnutls
+
+#else // USE_GNUTLS==0
+
+#include <openssl/ssl.h>
+
+#include <openssl/bio.h>
+#include <openssl/ec.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/x509.h>
+
+#ifndef BIO_EOF
+#define BIO_EOF -1
+#endif
+
+namespace rtc::openssl {
+
+void init();
+string error_string(unsigned long err);
+
+bool check(int success, const string &message = "OpenSSL error");
+bool check(SSL *ssl, int ret, const string &message = "OpenSSL error");
+
+} // namespace rtc::openssl
+
+#endif
+
+#endif

src/tlstransport.cpp

@@ -0,0 +1,429 @@
+/**
+ * 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 "tlstransport.hpp"
+#include "tcptransport.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include <chrono>
+#include <cstring>
+#include <exception>
+#include <iostream>
+
+using namespace std::chrono;
+
+using std::shared_ptr;
+using std::string;
+using std::unique_ptr;
+using std::weak_ptr;
+
+namespace rtc {
+
+#if USE_GNUTLS
+
+void TlsTransport::Init() {
+	// Nothing to do
+}
+
+void TlsTransport::Cleanup() {
+	// Nothing to do
+}
+
+TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_callback callback)
+    : Transport(lower, std::move(callback)), mHost(std::move(host)) {
+
+	PLOG_DEBUG << "Initializing TLS transport (GnuTLS)";
+
+	gnutls::check(gnutls_certificate_allocate_credentials(&mCreds));
+	gnutls::check(gnutls_init(&mSession, GNUTLS_CLIENT));
+
+	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;
+		gnutls::check(gnutls_priority_set_direct(mSession, priorities, &err_pos),
+		              "Failed to set TLS priorities");
+
+       	PLOG_VERBOSE << "Server Name Indication: " << mHost;
+		gnutls_server_name_set(mSession, GNUTLS_NAME_DNS, mHost.data(), mHost.size());
+
+ 		gnutls_session_set_ptr(mSession, this);
+		gnutls_transport_set_ptr(mSession, this);
+		gnutls_transport_set_push_function(mSession, WriteCallback);
+		gnutls_transport_set_pull_function(mSession, ReadCallback);
+		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
+
+       	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+		registerIncoming();
+
+	} catch (...) {
+		gnutls_deinit(mSession);
+		gnutls_certificate_free_credentials(mCreds);
+		throw;
+	}
+}
+
+TlsTransport::~TlsTransport() {
+	stop();
+
+	gnutls_deinit(mSession);
+	gnutls_certificate_free_credentials(mCreds);
+}
+
+bool TlsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Stopping TLS recv thread";
+	mIncomingQueue.stop();
+	mRecvThread.join();
+	return true;
+}
+
+bool TlsTransport::send(message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+
+	if(message->size() == 0)
+		return true;
+
+	ssize_t ret;
+	do {
+		ret = gnutls_record_send(mSession, message->data(), message->size());
+	} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+	return gnutls::check(ret);
+}
+
+void TlsTransport::incoming(message_ptr message) {
+	if (message)
+		mIncomingQueue.push(message);
+	else
+		mIncomingQueue.stop();
+}
+
+void TlsTransport::runRecvLoop() {
+	const size_t bufferSize = 4096;
+	char buffer[bufferSize];
+
+	// Handshake loop
+	try {
+		changeState(State::Connecting);
+
+		int ret;
+		do {
+			ret = gnutls_handshake(mSession);
+		} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ||
+		         !gnutls::check(ret, "TLS handshake failed"));
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TLS handshake: " << e.what();
+		changeState(State::Failed);
+		return;
+	}
+
+	// Receive loop
+	try {
+		PLOG_INFO << "TLS handshake finished";
+		changeState(State::Connected);
+
+		while (true) {
+			ssize_t ret;
+			do {
+				ret = gnutls_record_recv(mSession, buffer, bufferSize);
+			} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+			// Consider premature termination as remote closing
+			if (ret == GNUTLS_E_PREMATURE_TERMINATION) {
+				PLOG_DEBUG << "TLS connection terminated";
+				break;
+			}
+
+			if (gnutls::check(ret)) {
+				if (ret == 0) {
+					// Closed
+					PLOG_DEBUG << "TLS connection cleanly closed";
+					break;
+				}
+				auto *b = reinterpret_cast<byte *>(buffer);
+				recv(make_message(b, b + ret));
+			}
+		}
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TLS recv: " << e.what();
+	}
+
+	gnutls_bye(mSession, GNUTLS_SHUT_RDWR);
+
+	PLOG_INFO << "TLS closed";
+	changeState(State::Disconnected);
+	recv(nullptr);
+}
+
+ssize_t TlsTransport::WriteCallback(gnutls_transport_ptr_t ptr, const void *data, size_t len) {
+	TlsTransport *t = static_cast<TlsTransport *>(ptr);
+	if (len > 0) {
+		auto b = reinterpret_cast<const byte *>(data);
+		t->outgoing(make_message(b, b + len));
+	}
+	gnutls_transport_set_errno(t->mSession, 0);
+	return ssize_t(len);
+}
+
+ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen) {
+	TlsTransport *t = static_cast<TlsTransport *>(ptr);
+
+	message_ptr &message = t->mIncomingMessage;
+	size_t &position = t->mIncomingMessagePosition;
+
+	if(message && position >= message->size())
+		message.reset();
+
+	if(!message) {
+		position = 0;
+		while (auto next = t->mIncomingQueue.pop()) {
+			message = *next;
+			if (message->size() > 0)
+				break;
+			else
+				t->recv(message); // Pass zero-sized messages through
+		}
+	}
+
+	if(message) {
+		size_t available = message->size() - position;
+		ssize_t len = std::min(maxlen, available);
+		std::memcpy(data, message->data() + position, len);
+		position+= len;
+		gnutls_transport_set_errno(t->mSession, 0);
+		return len;
+	}
+	else {
+		// Closed
+		gnutls_transport_set_errno(t->mSession, 0);
+		return 0;
+	}
+}
+
+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;
+}
+
+#else // USE_GNUTLS==0
+
+int TlsTransport::TransportExIndex = -1;
+
+void TlsTransport::Init() {
+	openssl::init();
+
+	if (TransportExIndex < 0) {
+		TransportExIndex = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL);
+	}
+}
+
+void TlsTransport::Cleanup() {
+	// Nothing to do
+}
+
+TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_callback callback)
+    : Transport(lower, std::move(callback)), mHost(std::move(host)) {
+
+	PLOG_DEBUG << "Initializing TLS transport (OpenSSL)";
+
+	try {
+		if (!(mCtx = SSL_CTX_new(SSLv23_method()))) // version-flexible
+			throw std::runtime_error("Failed to create SSL context");
+
+		openssl::check(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
+		               "Failed to set SSL priorities");
+
+		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);
+
+		if (!(mSsl = SSL_new(mCtx)))
+			throw std::runtime_error("Failed to create SSL instance");
+
+		SSL_set_ex_data(mSsl, TransportExIndex, this);
+
+		SSL_set_hostflags(mSsl, 0);
+		openssl::check(SSL_set1_host(mSsl, mHost.c_str()), "Failed to set SSL host");
+
+		PLOG_VERBOSE << "Server Name Indication: " << mHost;
+		SSL_set_tlsext_host_name(mSsl, mHost.c_str());
+
+		SSL_set_connect_state(mSsl);
+
+		if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BIO_s_mem())))
+			throw std::runtime_error("Failed to create BIO");
+
+		BIO_set_mem_eof_return(mInBio, BIO_EOF);
+		BIO_set_mem_eof_return(mOutBio, BIO_EOF);
+		SSL_set_bio(mSsl, mInBio, mOutBio);
+
+		auto ecdh = unique_ptr<EC_KEY, decltype(&EC_KEY_free)>(
+		    EC_KEY_new_by_curve_name(NID_X9_62_prime256v1), EC_KEY_free);
+		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
+		SSL_set_tmp_ecdh(mSsl, ecdh.get());
+
+		mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+		registerIncoming();
+
+	} catch (...) {
+		if (mSsl)
+			SSL_free(mSsl);
+		if (mCtx)
+			SSL_CTX_free(mCtx);
+		throw;
+	}
+}
+
+TlsTransport::~TlsTransport() {
+	stop();
+
+	SSL_free(mSsl);
+	SSL_CTX_free(mCtx);
+}
+
+bool TlsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Stopping TLS recv thread";
+	mIncomingQueue.stop();
+	mRecvThread.join();
+	SSL_shutdown(mSsl);
+	return true;
+}
+
+bool TlsTransport::send(message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+
+	if (message->size() == 0)
+		return true;
+
+	int ret = SSL_write(mSsl, message->data(), message->size());
+	if (!openssl::check(mSsl, ret))
+		return false;
+
+	const size_t bufferSize = 4096;
+	byte buffer[bufferSize];
+	while ((ret = BIO_read(mOutBio, buffer, bufferSize)) > 0)
+		outgoing(make_message(buffer, buffer + ret));
+
+	return true;
+}
+
+void TlsTransport::incoming(message_ptr message) {
+	if (message)
+		mIncomingQueue.push(message);
+	else
+		mIncomingQueue.stop();
+}
+
+void TlsTransport::runRecvLoop() {
+	const size_t bufferSize = 4096;
+	byte buffer[bufferSize];
+
+	try {
+		changeState(State::Connecting);
+
+		while (true) {
+			if (state() == State::Connecting) {
+				// Initiate or continue the handshake
+				int ret = SSL_do_handshake(mSsl);
+				if (!openssl::check(mSsl, ret, "Handshake failed"))
+					break;
+
+				// Output
+				while ((ret = BIO_read(mOutBio, buffer, bufferSize)) > 0)
+					outgoing(make_message(buffer, buffer + ret));
+
+				if (SSL_is_init_finished(mSsl)) {
+					PLOG_INFO << "TLS handshake finished";
+					changeState(State::Connected);
+				}
+			} else {
+				int ret = SSL_read(mSsl, buffer, bufferSize);
+				if (!openssl::check(mSsl, ret))
+					break;
+
+				if (ret > 0)
+					recv(make_message(buffer, buffer + ret));
+			}
+
+			auto next = mIncomingQueue.pop();
+			if (!next)
+				break;
+
+			message_ptr message = *next;
+			if (message->size() > 0)
+				BIO_write(mInBio, message->data(), message->size()); // Input
+			else
+				recv(message); // Pass zero-sized messages through
+		}
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TLS recv: " << e.what();
+	}
+
+	if (state() == State::Connected) {
+		PLOG_INFO << "TLS closed";
+		recv(nullptr);
+	} else {
+		PLOG_ERROR << "TLS handshake failed";
+	}
+}
+
+void TlsTransport::InfoCallback(const SSL *ssl, int where, int ret) {
+	TlsTransport *t =
+	    static_cast<TlsTransport *>(SSL_get_ex_data(ssl, TlsTransport::TransportExIndex));
+
+	if (where & SSL_CB_ALERT) {
+		if (ret != 256) { // Close Notify
+			PLOG_ERROR << "TLS alert: " << SSL_alert_desc_string_long(ret);
+		}
+		t->mIncomingQueue.stop(); // Close the connection
+	}
+}
+
+#endif
+
+} // namespace rtc
+
+#endif

src/tlstransport.hpp

@@ -0,0 +1,83 @@
+/**
+ * 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_TLS_TRANSPORT_H
+#define RTC_TLS_TRANSPORT_H
+
+#include "include.hpp"
+#include "queue.hpp"
+#include "tls.hpp"
+#include "transport.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include <mutex>
+#include <thread>
+
+namespace rtc {
+
+class TcpTransport;
+
+class TlsTransport : public Transport {
+public:
+	static void Init();
+	static void Cleanup();
+
+	TlsTransport(std::shared_ptr<TcpTransport> lower, string host, state_callback callback);
+	~TlsTransport();
+
+	bool stop() override;
+	bool send(message_ptr message) override;
+
+	void incoming(message_ptr message) override;
+
+protected:
+	void runRecvLoop();
+
+	string mHost;
+
+	Queue<message_ptr> mIncomingQueue;
+	std::thread mRecvThread;
+
+#if USE_GNUTLS
+	gnutls_session_t mSession;
+	gnutls_certificate_credentials_t mCreds;
+
+	message_ptr mIncomingMessage;
+	size_t mIncomingMessagePosition = 0;
+
+	static ssize_t WriteCallback(gnutls_transport_ptr_t ptr, const void *data, size_t len);
+	static ssize_t ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen);
+	static int TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms);
+#else
+	SSL_CTX *mCtx;
+	SSL *mSsl;
+	BIO *mInBio, *mOutBio;
+
+	static int TransportExIndex;
+
+	static int CertificateCallback(int preverify_ok, X509_STORE_CTX *ctx);
+	static void InfoCallback(const SSL *ssl, int where, int ret);
+#endif
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/transport.hpp

@@ -32,7 +32,13 @@ using namespace std::placeholders;
 
 class Transport {
 public:
-	Transport(std::shared_ptr<Transport> lower = nullptr) : mLower(std::move(lower)) {}
+	enum class State { Disconnected, Connecting, Connected, Completed, Failed };
+	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)) {
+	}
+
 	virtual ~Transport() {
 		stop();
 		if (mLower)
@@ -49,11 +55,16 @@ public:
 	}
 
 	void onRecv(message_callback callback) { mRecvCallback = std::move(callback); }
+	State state() const { return mState; }
 
 	virtual bool send(message_ptr message) { return outgoing(message); }
 
 protected:
 	void recv(message_ptr message) { mRecvCallback(message); }
+	void changeState(State state) {
+		if (mState.exchange(state) != state)
+			mStateChangeCallback(state);
+	}
 
 	virtual void incoming(message_ptr message) { recv(message); }
 	virtual bool outgoing(message_ptr message) {
@@ -65,7 +76,10 @@ protected:
 
 private:
 	std::shared_ptr<Transport> mLower;
+	synchronized_callback<State> mStateChangeCallback;
 	synchronized_callback<message_ptr> mRecvCallback;
+
+	std::atomic<State> mState = State::Disconnected;
 	std::atomic<bool> mShutdown = false;
 };
 

src/websocket.cpp

@@ -0,0 +1,323 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "include.hpp"
+#include "websocket.hpp"
+
+#include "tcptransport.hpp"
+#include "tlstransport.hpp"
+#include "wstransport.hpp"
+
+#include <regex>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#endif
+
+namespace rtc {
+
+WebSocket::WebSocket() { PLOG_VERBOSE << "Creating WebSocket"; }
+
+WebSocket::~WebSocket() {
+	PLOG_VERBOSE << "Destroying WebSocket";
+	remoteClose();
+}
+
+WebSocket::State WebSocket::readyState() const { return mState; }
+
+void WebSocket::open(const string &url) {
+	if (mState != State::Closed)
+		throw std::runtime_error("WebSocket must be closed before opening");
+
+	static const char *rs = R"(^(([^:\/?#]+):)?(//([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?)";
+	static std::regex regex(rs, std::regex::extended);
+
+	std::smatch match;
+	if (!std::regex_match(url, match, regex))
+		throw std::invalid_argument("Malformed WebSocket URL: " + url);
+
+	mScheme = match[2];
+	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;
+		mService = mScheme == "ws" ? "80" : "443";
+	}
+
+	mPath = match[5];
+	if (string query = match[7]; !query.empty())
+		mPath += "?" + query;
+
+	changeState(State::Connecting);
+	initTcpTransport();
+}
+
+void WebSocket::close() {
+	auto state = mState.load();
+	if (state == State::Connecting || state == State::Open) {
+		PLOG_VERBOSE << "Closing WebSocket";
+		changeState(State::Closing);
+		if (auto transport = std::atomic_load(&mWsTransport))
+			transport->close();
+		else
+			changeState(State::Closed);
+	}
+}
+
+void WebSocket::remoteClose() {
+	if (mState.load() != State::Closed) {
+		close();
+		closeTransports();
+	}
+}
+
+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::isOpen() const { return mState == State::Open; }
+
+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;
+		}
+	}
+	return nullopt;
+}
+
+size_t WebSocket::availableAmount() const { return mRecvQueue.amount(); }
+
+bool WebSocket::changeState(State state) { return mState.exchange(state) != state; }
+
+bool WebSocket::outgoing(message_ptr message) {
+	if (mState != State::Open || !mWsTransport)
+		throw std::runtime_error("WebSocket is not open");
+
+	if (message->size() > maxMessageSize())
+		throw std::runtime_error("Message size exceeds limit");
+
+	return mWsTransport->send(message);
+}
+
+void WebSocket::incoming(message_ptr message) {
+	if (message->type == Message::String || message->type == Message::Binary) {
+		mRecvQueue.push(message);
+		triggerAvailable(mRecvQueue.size());
+	}
+}
+
+std::shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
+	using State = TcpTransport::State;
+	try {
+		std::lock_guard lock(mInitMutex);
+		if (auto transport = std::atomic_load(&mTcpTransport))
+			return transport;
+
+		auto transport = std::make_shared<TcpTransport>(
+		    mHostname, mService, [this, weak_this = weak_from_this()](State state) {
+			    auto shared_this = weak_this.lock();
+			    if (!shared_this)
+				    return;
+			    switch (state) {
+			    case State::Connected:
+				    if (mScheme == "ws")
+					    initWsTransport();
+				    else
+					    initTlsTransport();
+				    break;
+			    case State::Failed:
+				    triggerError("TCP connection failed");
+				    remoteClose();
+				    break;
+			    case State::Disconnected:
+				    remoteClose();
+				    break;
+			    default:
+				    // Ignore
+				    break;
+			    }
+		    });
+		std::atomic_store(&mTcpTransport, transport);
+		if (mState == WebSocket::State::Closed) {
+			mTcpTransport.reset();
+			transport->stop();
+			throw std::runtime_error("Connection is closed");
+		}
+		return transport;
+	} catch (const std::exception &e) {
+		PLOG_ERROR << e.what();
+		remoteClose();
+		throw std::runtime_error("TCP transport initialization failed");
+	}
+}
+
+std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
+	using State = TlsTransport::State;
+	try {
+		std::lock_guard lock(mInitMutex);
+		if (auto transport = std::atomic_load(&mTlsTransport))
+			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 shared_this = weak_this.lock();
+			    if (!shared_this)
+				    return;
+			    switch (state) {
+			    case State::Connected:
+				    initWsTransport();
+				    break;
+			    case State::Failed:
+				    triggerError("TCP connection failed");
+				    remoteClose();
+				    break;
+			    case State::Disconnected:
+				    remoteClose();
+				    break;
+			    default:
+				    // Ignore
+				    break;
+			    }
+		    });
+		std::atomic_store(&mTlsTransport, transport);
+		if (mState == WebSocket::State::Closed) {
+			mTlsTransport.reset();
+			transport->stop();
+			throw std::runtime_error("Connection is closed");
+		}
+		return transport;
+	} catch (const std::exception &e) {
+		PLOG_ERROR << e.what();
+		remoteClose();
+		throw std::runtime_error("TLS transport initialization failed");
+	}
+}
+
+std::shared_ptr<WsTransport> WebSocket::initWsTransport() {
+	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);
+		if (!lower)
+			lower = std::atomic_load(&mTcpTransport);
+		auto transport = std::make_shared<WsTransport>(
+		    lower, mHost, mPath, weak_bind(&WebSocket::incoming, this, _1),
+		    [this, weak_this = weak_from_this()](State state) {
+			    auto shared_this = weak_this.lock();
+			    if (!shared_this)
+				    return;
+			    switch (state) {
+			    case State::Connected:
+				    if (mState == WebSocket::State::Connecting) {
+					    PLOG_DEBUG << "WebSocket open";
+					    changeState(WebSocket::State::Open);
+					    triggerOpen();
+				    }
+				    break;
+			    case State::Failed:
+				    triggerError("WebSocket connection failed");
+				    remoteClose();
+				    break;
+			    case State::Disconnected:
+				    remoteClose();
+				    break;
+			    default:
+				    // Ignore
+				    break;
+			    }
+		    });
+		std::atomic_store(&mWsTransport, transport);
+		if (mState == WebSocket::State::Closed) {
+			mWsTransport.reset();
+			transport->stop();
+			throw std::runtime_error("Connection is closed");
+		}
+		return transport;
+	} catch (const std::exception &e) {
+		PLOG_ERROR << e.what();
+		remoteClose();
+		throw std::runtime_error("WebSocket transport initialization failed");
+	}
+}
+
+void WebSocket::closeTransports() {
+	PLOG_VERBOSE << "Closing transports";
+
+	if (mState.load() != State::Closed) {
+		changeState(State::Closed);
+		triggerClosed();
+	}
+
+	// Reset callbacks now that state is changed
+	resetCallbacks();
+
+	// Pass the references 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 {
+			if (ws)
+				ws->stop();
+			if (tls)
+				tls->stop();
+			if (tcp)
+				tcp->stop();
+
+			ws.reset();
+			tls.reset();
+			tcp.reset();
+		});
+		t.detach();
+	}
+}
+
+} // namespace rtc
+
+#endif

src/wstransport.cpp

@@ -0,0 +1,400 @@
+/**
+ * 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 "wstransport.hpp"
+#include "tcptransport.hpp"
+#include "tlstransport.hpp"
+#include "base64.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include <chrono>
+#include <list>
+#include <map>
+#include <random>
+#include <regex>
+
+#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 {
+
+using namespace std::chrono;
+using std::to_integer;
+using std::to_string;
+
+using random_bytes_engine =
+    std::independent_bits_engine<std::default_random_engine, CHAR_BIT, unsigned char>;
+
+WsTransport::WsTransport(std::shared_ptr<Transport> lower, string host, string path,
+                         message_callback recvCallback, state_callback stateCallback)
+    : Transport(lower, std::move(stateCallback)), mHost(std::move(host)), mPath(std::move(path)) {
+	onRecv(recvCallback);
+
+	PLOG_DEBUG << "Initializing WebSocket transport";
+
+	registerIncoming();
+	sendHttpRequest();
+}
+
+WsTransport::~WsTransport() { stop(); }
+
+bool WsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	close();
+	return true;
+}
+
+bool WsTransport::send(message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+	return sendFrame({message->type == Message::String ? TEXT_FRAME : BINARY_FRAME, message->data(),
+	                  message->size(), true, true});
+}
+
+void WsTransport::incoming(message_ptr message) {
+	auto s = state();
+	if (s != State::Connecting && s != State::Connected)
+		return; // Drop
+
+	if (message) {
+		PLOG_VERBOSE << "Incoming size=" << message->size();
+
+		if (message->size() == 0) {
+			// TCP is idle, send a ping
+			PLOG_DEBUG << "WebSocket sending ping";
+			uint32_t dummy = 0;
+			sendFrame({PING, reinterpret_cast<byte *>(&dummy), 4, true, true});
+			return;
+		}
+
+		mBuffer.insert(mBuffer.end(), message->begin(), message->end());
+
+		try {
+			if (state() == State::Connecting) {
+				if (size_t len = readHttpResponse(mBuffer.data(), mBuffer.size())) {
+					PLOG_INFO << "WebSocket open";
+					changeState(State::Connected);
+					mBuffer.erase(mBuffer.begin(), mBuffer.begin() + len);
+				}
+			}
+
+			if (state() == State::Connected) {
+				Frame frame;
+				while (size_t len = readFrame(mBuffer.data(), mBuffer.size(), frame)) {
+					recvFrame(frame);
+					mBuffer.erase(mBuffer.begin(), mBuffer.begin() + len);
+				}
+			}
+
+			return;
+
+		} catch (const std::exception &e) {
+			PLOG_ERROR << e.what();
+		}
+	}
+
+	if (state() == State::Connected) {
+		PLOG_INFO << "WebSocket disconnected";
+		changeState(State::Disconnected);
+		recv(nullptr);
+	} else {
+		PLOG_ERROR << "WebSocket handshake failed";
+		changeState(State::Failed);
+	}
+}
+
+void WsTransport::close() {
+	if (state() == State::Connected) {
+		sendFrame({CLOSE, NULL, 0, true, true});
+		PLOG_INFO << "WebSocket closing";
+		changeState(State::Disconnected);
+	}
+}
+
+bool WsTransport::sendHttpRequest() {
+	changeState(State::Connecting);
+
+	auto seed = 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);
+
+	const string request = "GET " + mPath +
+	                       " HTTP/1.1\r\n"
+	                       "Host: " +
+	                       mHost +
+	                       "\r\n"
+	                       "Connection: Upgrade\r\n"
+	                       "Upgrade: websocket\r\n"
+	                       "Sec-WebSocket-Version: 13\r\n"
+	                       "Sec-WebSocket-Key: " +
+	                       to_base64(key) +
+	                       "\r\n"
+	                       "\r\n";
+
+	auto data = reinterpret_cast<const byte *>(request.data());
+	auto size = request.size();
+	return outgoing(make_message(data, data + size));
+}
+
+size_t WsTransport::readHttpResponse(const byte *buffer, size_t size) {
+	std::list<string> lines;
+	auto begin = reinterpret_cast<const char *>(buffer);
+	auto end = begin + size;
+	auto cur = begin;
+
+	while (true) {
+		auto last = cur;
+		cur = std::find(cur, end, '\n');
+		if (cur == end)
+			return 0;
+		string line(last, cur != begin && *std::prev(cur) == '\r' ? std::prev(cur++) : cur++);
+		if (line.empty())
+			break;
+		lines.emplace_back(std::move(line));
+	}
+	size_t length = cur - begin;
+
+	if (lines.empty())
+		throw std::runtime_error("Invalid HTTP response for WebSocket");
+
+	string status = std::move(lines.front());
+	lines.pop_front();
+
+	std::istringstream ss(status);
+	string protocol;
+	unsigned int code = 0;
+	ss >> protocol >> code;
+	PLOG_DEBUG << "WebSocket response code: " << code;
+	if (code != 101)
+		throw std::runtime_error("Unexpected response code for WebSocket: " + to_string(code));
+
+	std::multimap<string, string> headers;
+	for (const auto &line : lines) {
+		if (size_t pos = line.find_first_of(':'); pos != string::npos) {
+			string key = line.substr(0, pos);
+			string value = line.substr(line.find_first_not_of(' ', pos + 1));
+			std::transform(key.begin(), key.end(), key.begin(),
+			               [](char c) { return std::tolower(c); });
+			headers.emplace(std::move(key), std::move(value));
+		} else {
+			headers.emplace(line, "");
+		}
+	}
+
+	auto h = headers.find("upgrade");
+	if (h == headers.end() || h->second != "websocket")
+		throw std::runtime_error("WebSocket update header missing or mismatching");
+
+	h = headers.find("sec-websocket-accept");
+	if (h == headers.end())
+		throw std::runtime_error("WebSocket accept header missing");
+
+	// TODO: Verify Sec-WebSocket-Accept
+
+	return length;
+}
+
+// http://tools.ietf.org/html/rfc6455#section-5.2  Base Framing Protocol
+//
+//  0                   1                   2                   3
+//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-------+-+-------------+-------------------------------+
+// |F|R|R|R| opcode|M| Payload len |    Extended payload length    |
+// |I|S|S|S|  (4)  |A|     (7)     |             (16/64)           |
+// |N|V|V|V|       |S|             |   (if payload len==126/127)   |
+// | |1|2|3|       |K|             |                               |
+// +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
+// |    Extended payload length continued, if payload len == 127   |
+// + - - - - - - - - - - - - - - - +-------------------------------+
+// |                               | Masking-key, if MASK set to 1 |
+// +-------------------------------+-------------------------------+
+// |    Masking-key (continued)    |          Payload Data         |
+// +-------------------------------+ - - - - - - - - - - - - - - - +
+// :                     Payload Data continued ...                :
+// + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
+// |                     Payload Data continued ...                |
+// +---------------------------------------------------------------+
+
+size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
+	const byte *end = buffer + size;
+	if (end - buffer < 2)
+		return 0;
+
+	byte *cur = buffer;
+	auto b1 = to_integer<uint8_t>(*cur++);
+	auto b2 = to_integer<uint8_t>(*cur++);
+
+	frame.fin = (b1 & 0x80) != 0;
+	frame.mask = (b2 & 0x80) != 0;
+	frame.opcode = static_cast<Opcode>(b1 & 0x0F);
+	frame.length = b2 & 0x7F;
+
+	if (frame.length == 0x7E) {
+		if (end - cur < 2)
+			return 0;
+		frame.length = ntohs(*reinterpret_cast<const uint16_t *>(cur));
+		cur += 2;
+	} else if (frame.length == 0x7F) {
+		if (end - cur < 8)
+			return 0;
+		frame.length = ntohll(*reinterpret_cast<const uint64_t *>(cur));
+		cur += 8;
+	}
+
+	const byte *maskingKey = nullptr;
+	if (frame.mask) {
+		if (end - cur < 4)
+			return 0;
+		maskingKey = cur;
+		cur += 4;
+	}
+
+	if (end - cur < frame.length)
+		return 0;
+
+	frame.payload = cur;
+	if (maskingKey)
+		for (size_t i = 0; i < frame.length; ++i)
+			frame.payload[i] ^= maskingKey[i % 4];
+	cur += frame.length;
+
+	return cur - buffer;
+}
+
+void WsTransport::recvFrame(const Frame &frame) {
+	PLOG_DEBUG << "WebSocket received frame: opcode=" << int(frame.opcode)
+	           << ", length=" << frame.length;
+
+	switch (frame.opcode) {
+	case TEXT_FRAME:
+	case BINARY_FRAME: {
+		if (!mPartial.empty()) {
+			PLOG_WARNING << "WebSocket unfinished message: type="
+			             << (mPartialOpcode == TEXT_FRAME ? "text" : "binary")
+			             << ", length=" << mPartial.size();
+			auto type = mPartialOpcode == TEXT_FRAME ? Message::String : Message::Binary;
+			recv(make_message(mPartial.begin(), mPartial.end(), type));
+			mPartial.clear();
+		}
+		mPartialOpcode = frame.opcode;
+		if (frame.fin) {
+			PLOG_DEBUG << "WebSocket finished message: type="
+			           << (frame.opcode == TEXT_FRAME ? "text" : "binary")
+			           << ", length=" << frame.length;
+			auto type = frame.opcode == TEXT_FRAME ? Message::String : Message::Binary;
+			recv(make_message(frame.payload, frame.payload + frame.length, type));
+		} else {
+			mPartial.insert(mPartial.end(), frame.payload, frame.payload + frame.length);
+		}
+		break;
+	}
+	case CONTINUATION: {
+		mPartial.insert(mPartial.end(), frame.payload, frame.payload + frame.length);
+		if (frame.fin) {
+			PLOG_DEBUG << "WebSocket finished message: type="
+			           << (frame.opcode == TEXT_FRAME ? "text" : "binary")
+			           << ", length=" << mPartial.size();
+			auto type = mPartialOpcode == TEXT_FRAME ? Message::String : Message::Binary;
+			recv(make_message(mPartial.begin(), mPartial.end(), type));
+			mPartial.clear();
+		}
+		break;
+	}
+	case PING: {
+		PLOG_DEBUG << "WebSocket received ping, sending pong";
+		sendFrame({PONG, frame.payload, frame.length, true, true});
+		break;
+	}
+	case PONG: {
+		PLOG_DEBUG << "WebSocket received pong";
+		break;
+	}
+	case CLOSE: {
+		close();
+		PLOG_INFO << "WebSocket closed";
+		changeState(State::Disconnected);
+		break;
+	}
+	default: {
+		close();
+		throw std::invalid_argument("Unknown WebSocket opcode: " + to_string(frame.opcode));
+	}
+	}
+}
+
+bool WsTransport::sendFrame(const Frame &frame) {
+	PLOG_DEBUG << "WebSocket sending frame: opcode=" << int(frame.opcode)
+	           << ", length=" << frame.length;
+
+	byte buffer[14];
+	byte *cur = buffer;
+
+	*cur++ = byte((frame.opcode & 0x0F) | (frame.fin ? 0x80 : 0));
+
+	if (frame.length < 0x7E) {
+		*cur++ = byte((frame.length & 0x7F) | (frame.mask ? 0x80 : 0));
+	} else if (frame.length <= 0xFFFF) {
+		*cur++ = byte(0x7E | (frame.mask ? 0x80 : 0));
+		*reinterpret_cast<uint16_t *>(cur) = htons(uint16_t(frame.length));
+		cur += 2;
+	} else {
+		*cur++ = byte(0x7F | (frame.mask ? 0x80 : 0));
+		*reinterpret_cast<uint64_t *>(cur) = htonll(uint64_t(frame.length));
+		cur += 8;
+	}
+
+	if (frame.mask) {
+		auto seed = 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);
+		cur += 4;
+
+		for (size_t i = 0; i < frame.length; ++i)
+			frame.payload[i] ^= maskingKey[i % 4];
+	}
+
+	outgoing(make_message(buffer, cur));                                        // header
+	return outgoing(make_message(frame.payload, frame.payload + frame.length)); // payload
+}
+
+} // namespace rtc
+
+#endif

src/wstransport.hpp

@@ -0,0 +1,82 @@
+/**
+ * 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_WS_TRANSPORT_H
+#define RTC_WS_TRANSPORT_H
+
+#include "include.hpp"
+#include "transport.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+namespace rtc {
+
+class TcpTransport;
+class TlsTransport;
+
+class WsTransport : public Transport {
+public:
+	WsTransport(std::shared_ptr<Transport> lower, string host, string path,
+	            message_callback recvCallback, state_callback stateCallback);
+	~WsTransport();
+
+	bool stop() override;
+	bool send(message_ptr message) override;
+
+	void incoming(message_ptr message) override;
+
+	void close();
+
+private:
+	enum Opcode : uint8_t {
+		CONTINUATION = 0,
+		TEXT_FRAME = 1,
+		BINARY_FRAME = 2,
+		CLOSE = 8,
+		PING = 9,
+		PONG = 10,
+	};
+
+	struct Frame {
+		Opcode opcode = BINARY_FRAME;
+		byte *payload = nullptr;
+		size_t length = 0;
+		bool fin = true;
+		bool mask = true;
+	};
+
+	bool sendHttpRequest();
+	size_t readHttpResponse(const byte *buffer, size_t size);
+
+	size_t readFrame(byte *buffer, size_t size, Frame &frame);
+	void recvFrame(const Frame &frame);
+	bool sendFrame(const Frame &frame);
+
+	const string mHost;
+	const string mPath;
+
+	binary mBuffer;
+	binary mPartial;
+	Opcode mPartialOpcode;
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

test/main.cpp

@@ -22,23 +22,34 @@ using namespace std;
 
 void test_connectivity();
 void test_capi();
+void test_websocket();
 
 int main(int argc, char **argv) {
 	try {
-		std::cout << "*** Running connectivity test..." << std::endl;
+		cout << endl << "*** Running WebRTC connectivity test..." << endl;
 		test_connectivity();
-		std::cout << "*** Finished connectivity test" << std::endl;
+		cout << "*** Finished WebRTC connectivity test" << endl;
 	} catch (const exception &e) {
-		std::cerr << "Connectivity test failed: " << e.what() << endl;
+		cerr << "WebRTC connectivity test failed: " << e.what() << endl;
 		return -1;
 	}
 	try {
-		std::cout << "*** Running C API test..." << std::endl;
+		cout << endl << "*** Running WebRTC C API test..." << endl;
 		test_capi();
-		std::cout << "*** Finished C API test" << std::endl;
+		cout << "*** Finished WebRTC C API test" << endl;
 	} catch (const exception &e) {
-		std::cerr << "C API test failed: " << e.what() << endl;
+		cerr << "WebRTC C API test failed: " << e.what() << endl;
 		return -1;
 	}
+#if RTC_ENABLE_WEBSOCKET
+	try {
+		cout << endl << "*** Running WebSocket test..." << endl;
+		test_websocket();
+		cout << "*** Finished WebSocket test" << endl;
+	} catch (const exception &e) {
+		cerr << "WebSocket test failed: " << e.what() << endl;
+		return -1;
+	}
+#endif
 	return 0;
 }

test/p2p_c_version/CMakeLists.txt

@@ -1,12 +0,0 @@
-cmake_minimum_required(VERSION 3.5.1)
-project(offerer C)
-
-
-set(CMAKE_C_STANDARD 11)
-set(CMAKE_C_FLAGS "-Wall -g -O2")
-
-add_executable(offerer offerer.c)
-target_link_libraries(offerer  datachannel)
-
-add_executable(answerer answerer.c)
-target_link_libraries(answerer  datachannel)

test/websocket.cpp

@@ -0,0 +1,85 @@
+/**
+ * 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 "rtc/rtc.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include <chrono>
+#include <iostream>
+#include <memory>
+#include <thread>
+#include <atomic>
+
+using namespace rtc;
+using namespace std;
+
+template <class T> weak_ptr<T> make_weak_ptr(shared_ptr<T> ptr) { return ptr; }
+
+void test_websocket() {
+	InitLogger(LogLevel::Debug);
+
+	const string myMessage = "Hello world from libdatachannel";
+
+	auto ws = std::make_shared<WebSocket>();
+
+	ws->onOpen([wws = make_weak_ptr(ws), &myMessage]() {
+		auto ws = wws.lock();
+		if (!ws)
+			return;
+		cout << "WebSocket: Open" << endl;
+		ws->send(myMessage);
+	});
+
+	ws->onClosed([]() { cout << "WebSocket: Closed" << endl; });
+
+	std::atomic<bool> received = false;
+	ws->onMessage([&received, &myMessage](const variant<binary, string> &message) {
+		if (holds_alternative<string>(message)) {
+			string str = get<string>(message);
+			if((received = (str == myMessage)))
+				cout << "WebSocket: Received expected message" << endl;
+			else
+				cout << "WebSocket: Received UNEXPECTED message" << endl;
+		}
+	});
+
+	ws->open("wss://echo.websocket.org/");
+
+	int attempts = 10;
+	while ((!ws->isOpen() || !received) && attempts--)
+		this_thread::sleep_for(1s);
+
+	if (!ws->isOpen())
+		throw runtime_error("WebSocket is not open");
+
+	if(!received)
+		throw runtime_error("Expected message not received");
+
+	ws->close();
+	this_thread::sleep_for(1s);
+
+	// You may call rtc::Cleanup() when finished to free static resources
+	rtc::Cleanup();
+	this_thread::sleep_for(1s);
+
+	cout << "Success" << endl;
+}
+
+#endif
+