Merge branch 'master' into srtp

.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

@@ -0,0 +1,40 @@
+name: Build and test with GnuTLS
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build-ubuntu:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libgnutls28-dev nettle-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: brew install gnutls nettle
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_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

@@ -0,0 +1,24 @@
+name: Build and test with libnice
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build-ubuntu:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libgnutls28-dev libnice-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_JUICE=0 -DUSE_GNUTLS=1
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+

.github/workflows/build-openssl.yml

@@ -0,0 +1,42 @@
+name: Build and test with OpenSSL
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build-ubuntu:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: sudo apt update && sudo apt install libssl-dev
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=0
+    - name: make
+      run: (cd build; make -j2)
+    - name: test
+      run: ./build/tests
+  build-macos:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: install packages
+      run: brew reinstall [email protected]
+    - 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

.github/workflows/build.yml

@@ -1,21 +0,0 @@
-name: Build and test
-on: [push, pull_request]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-    - name: install packages
-      run: sudo apt update && sudo apt install libgnutls28-dev nettle-dev
-    - name: submodules
-      run: git submodule update --init --recursive
-    - name: cmake
-      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=1
-    - name: make
-      run: (cd build; make)
-    - 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

@@ -1,7 +1,7 @@
-cmake_minimum_required (VERSION 3.7)
-project (libdatachannel
+cmake_minimum_required(VERSION 3.7)
+project(libdatachannel
 	DESCRIPTION "WebRTC DataChannels Library"
-	VERSION 0.4.9
+	VERSION 0.5.1
 	LANGUAGES CXX)
 
 option(USE_GNUTLS "Use GnuTLS instead of OpenSSL" OFF)
@@ -19,6 +19,9 @@ set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/Modules)
 
 if(WIN32)
 	add_definitions(-DWIN32_LEAN_AND_MEAN)
+	if (MSVC)
+		add_definitions(-DNOMINMAX)
+	endif()
 endif()
 
 set(LIBDATACHANNEL_SOURCES
@@ -70,20 +73,17 @@ 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(THREADS_PREFER_PTHREAD_FLAG ON)
+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)
 	target_compile_definitions(usrsctp PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
@@ -124,19 +124,18 @@ set_target_properties(datachannel-static PROPERTIES
 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_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/deps/plog/include)
+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 PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
 target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-target_include_directories(datachannel-static PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/deps/plog/include)
-
-target_link_libraries(datachannel Threads::Threads Usrsctp::UsrsctpStatic)
-target_link_libraries(datachannel-static Threads::Threads Usrsctp::UsrsctpStatic)
+target_link_libraries(datachannel-static PUBLIC Threads::Threads plog::plog)
+target_link_libraries(datachannel-static PRIVATE Usrsctp::UsrsctpStatic)
 
 if(WIN32)
-	target_link_libraries(datachannel "wsock32" "ws2_32") # winsock2
-	target_link_libraries(datachannel-static "wsock32" "ws2_32") # winsock2
+	target_link_libraries(datachannel PRIVATE wsock32 ws2_32) # winsock2
+	target_link_libraries(datachannel-static PRIVATE wsock32 ws2_32) # winsock2
 endif()
 
 if(SRTP_FOUND)
@@ -149,8 +148,8 @@ if(SRTP_FOUND)
 	endif()
 	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_MEDIA=1)
 	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_MEDIA=1)
-	target_link_libraries(datachannel SRTP::SRTP)
-	target_link_libraries(datachannel-static SRTP::SRTP)
+	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)
@@ -168,28 +167,28 @@ if (USE_GNUTLS)
 	endif()
 	target_compile_definitions(datachannel PRIVATE USE_GNUTLS=1)
 	target_compile_definitions(datachannel-static PRIVATE USE_GNUTLS=1)
-	target_link_libraries(datachannel GnuTLS::GnuTLS)
-	target_link_libraries(datachannel-static GnuTLS::GnuTLS)
+	target_link_libraries(datachannel PRIVATE GnuTLS::GnuTLS)
+	target_link_libraries(datachannel-static PRIVATE GnuTLS::GnuTLS)
 else()
 	find_package(OpenSSL REQUIRED)
 	target_compile_definitions(datachannel PRIVATE USE_GNUTLS=0)
 	target_compile_definitions(datachannel-static PRIVATE USE_GNUTLS=0)
-	target_link_libraries(datachannel OpenSSL::SSL)
-	target_link_libraries(datachannel-static OpenSSL::SSL)
+	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_compile_definitions(datachannel-static PRIVATE USE_JUICE=1)
-	target_link_libraries(datachannel LibJuice::LibJuiceStatic)
-	target_link_libraries(datachannel-static LibJuice::LibJuiceStatic)
+	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_compile_definitions(datachannel-static PRIVATE USE_JUICE=0)
-	target_link_libraries(datachannel LibNice::LibNice)
-	target_link_libraries(datachannel-static LibNice::LibNice)
+	target_link_libraries(datachannel PRIVATE LibNice::LibNice)
+	target_link_libraries(datachannel-static PRIVATE LibNice::LibNice)
 endif()
 
 add_library(LibDataChannel::LibDataChannel ALIAS datachannel)
@@ -198,28 +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)
-
-# P2P Test: offerer
-add_executable(datachannel-offerer ${TESTS_OFFERER_SOURCES})
-set_target_properties(datachannel-offerer PROPERTIES
-	VERSION ${PROJECT_VERSION}
-	CXX_STANDARD 17)
-set_target_properties(datachannel-offerer PROPERTIES OUTPUT_NAME offerer)
-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)
+target_link_libraries(datachannel-tests datachannel nlohmann_json::nlohmann_json)
+
+# Examples
+set(JSON_BuildTests OFF CACHE INTERNAL "")
+add_subdirectory(deps/json)
+add_subdirectory(examples/client)
+add_subdirectory(examples/copy-paste)
+add_subdirectory(examples/copy-paste-capi)
 

README.md

@@ -1,16 +1,45 @@
-# 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.
 
-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.
+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).
 
-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/).
+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.
 
 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
+
+### 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
 
@@ -20,8 +49,8 @@ Optional:
 - libnice: https://nice.freedesktop.org/ (substituable with libjuice)
 
 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 +70,11 @@ $ git submodule update --init --recursive
 $ make USE_JUICE=1 USE_GNUTLS=1
 ```
 
-## Example
+## Examples
+
+See [examples](https://github.com/paullouisageneau/libdatachannel/blob/master/examples/) for a complete usage example with signaling server (under GPLv2).
 
-In the following example, note the callbacks are called in another thread.
+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 +124,11 @@ 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 +147,22 @@ 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
+
+```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");
 
-See [test/cpai.cpp](https://github.com/paullouisageneau/libdatachannel/blob/master/test/capi.cpp) for a C API example.
+```
 

deps/json

@@ -0,0 +1 @@
+Subproject commit 973c52dd4a9e92ede5ca4afe8b3d01ef677dc57f

deps/libjuice

@@ -1 +1 @@
-Subproject commit e56531c647b157e0ea93368b8ec4b635895d3b57
+Subproject commit 6f6faa578396960a5f426582ed12db2747e4f68d

deps/plog

@@ -1 +1 @@
-Subproject commit 293164468998b2ff8d4d13684c065f736ec68fb4
+Subproject commit 47883f060999d536edfc41a71fb822c35a195938

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 +1,9 @@
+cmake_minimum_required(VERSION 3.7)
+cmake_policy(SET CMP0079 NEW)
+
+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
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
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+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
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+
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+with the Program (or with a work based on the Program) on a volume of
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+under Section 2) in object code or executable form under the terms of
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+  4. You may not copy, modify, sublicense, or distribute the Program
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+
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+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
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+
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+
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+Foundation.
+
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+
+                            NO WARRANTY
+
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+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>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

examples/client/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/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.7)
+cmake_policy(SET CMP0079 NEW)
+
+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)
+

test/p2p/answerer.cpp → 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");

test/p2p/offerer.cpp → 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
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU Affero General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
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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()

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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 <[email protected]>"]
+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
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
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+
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+
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+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": {
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+      "requires": {
+        "es5-ext": "^0.10.50",
+        "type": "^1.0.1"
+      }
+    },
+    "debug": {
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+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "es5-ext": {
+      "version": "0.10.53",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.53.tgz",
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+      "requires": {
+        "es6-iterator": "~2.0.3",
+        "es6-symbol": "~3.1.3",
+        "next-tick": "~1.0.0"
+      }
+    },
+    "es6-iterator": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
+      "integrity": "sha1-p96IkUGgWpSwhUQDstCg+/qY87c=",
+      "requires": {
+        "d": "1",
+        "es5-ext": "^0.10.35",
+        "es6-symbol": "^3.1.1"
+      }
+    },
+    "es6-symbol": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.3.tgz",
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+      "requires": {
+        "d": "^1.0.1",
+        "ext": "^1.1.2"
+      }
+    },
+    "ext": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/ext/-/ext-1.4.0.tgz",
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+      "requires": {
+        "type": "^2.0.0"
+      },
+      "dependencies": {
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+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/type/-/type-2.0.0.tgz",
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+        }
+      }
+    },
+    "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",
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+    },
+    "typedarray-to-buffer": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
+      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+      "requires": {
+        "is-typedarray": "^1.0.0"
+      }
+    },
+    "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/peerconnection.hpp

@@ -31,6 +31,7 @@
 
 #include <atomic>
 #include <functional>
+#include <future>
 #include <list>
 #include <mutex>
 #include <shared_mutex>
@@ -44,6 +45,9 @@ class IceTransport;
 class DtlsTransport;
 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> {
 public:
 	enum class State : int {
@@ -136,7 +140,7 @@ private:
 	void outgoingMedia(message_ptr message);
 
 	const Configuration mConfig;
-	const std::shared_ptr<Certificate> mCertificate;
+	const future_certificate_ptr mCertificate;
 
 	init_token mInitToken = Init::Token();
 

include/rtc/rtc.h

@@ -129,6 +129,9 @@ 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();
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

include/rtc/websocket.hpp

@@ -48,7 +48,6 @@ public:
 	};
 
 	WebSocket();
-	WebSocket(const string &url);
 	~WebSocket();
 
 	State readyState() const;

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 &&
-	    ss >> node >> service >> typ_ >> type && typ_ == "typ") {
+	if (iss >> foundation >> component >> transport >> priority &&
+	    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();
-						ss << foundation << sp << component << sp << transport << sp << priority;
-						ss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
-						if (!left.empty())
-							ss << left;
-						mCandidate = ss.str();
+						std::ostringstream oss;
+						oss << foundation << sp << component << sp << transport << sp << priority;
+						oss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
+						oss << left;
+						mCandidate = oss.str();
+						PLOG_VERBOSE << "Resolved candidate: " << mCandidate;
 						return mIsResolved = true;
 					}
 				}

src/certificate.cpp

@@ -91,14 +91,9 @@ string make_fingerprint(gnutls_x509_crt_t crt) {
 	return oss.str();
 }
 
-shared_ptr<Certificate> make_certificate(const string &commonName) {
-	static std::unordered_map<string, shared_ptr<Certificate>> cache;
-	static std::mutex cacheMutex;
-
-	std::lock_guard lock(cacheMutex);
-	if (auto it = cache.find(commonName); it != cache.end())
-		return it->second;
+namespace {
 
+certificate_ptr make_certificate_impl(string commonName) {
 	using namespace gnutls;
 	unique_ptr<gnutls_x509_crt_t, decltype(&free_crt)> crt(new_crt(), free_crt);
 	unique_ptr<gnutls_x509_privkey_t, decltype(&free_privkey)> privkey(new_privkey(), free_privkey);
@@ -124,11 +119,11 @@ shared_ptr<Certificate> make_certificate(const string &commonName) {
 	gnutls::check(gnutls_x509_crt_sign2(*crt, *crt, *privkey, GNUTLS_DIG_SHA256, 0),
 	              "Unable to auto-sign certificate");
 
-	auto certificate = std::make_shared<Certificate>(*crt, *privkey);
-	cache.emplace(std::make_pair(commonName, certificate));
-	return certificate;
+	return std::make_shared<Certificate>(*crt, *privkey);
 }
 
+} // namespace
+
 } // namespace rtc
 
 #else // USE_GNUTLS==0
@@ -180,15 +175,9 @@ string make_fingerprint(X509 *x509) {
 	return oss.str();
 }
 
+namespace {
 
-shared_ptr<Certificate> make_certificate(const string &commonName) {
-	static std::unordered_map<string, shared_ptr<Certificate>> cache;
-	static std::mutex cacheMutex;
-
-	std::lock_guard lock(cacheMutex);
-	if (auto it = cache.find(commonName); it != cache.end())
-		return it->second;
-
+certificate_ptr make_certificate_impl(string commonName) {
 	shared_ptr<X509> x509(X509_new(), X509_free);
 	shared_ptr<EVP_PKEY> pkey(EVP_PKEY_new(), EVP_PKEY_free);
 
@@ -209,7 +198,8 @@ shared_ptr<Certificate> make_certificate(const 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) ||
@@ -225,12 +215,54 @@ shared_ptr<Certificate> make_certificate(const string &commonName) {
 	if (!X509_sign(x509.get(), pkey.get(), EVP_sha256()))
 		throw std::runtime_error("Unable to auto-sign certificate");
 
-	auto certificate = std::make_shared<Certificate>(x509, pkey);
-	cache.emplace(std::make_pair(commonName, certificate));
-	return certificate;
+	return std::make_shared<Certificate>(x509, pkey);
 }
 
+} // namespace
+
 } // namespace rtc
 
 #endif
 
+// Common for GnuTLS and OpenSSL
+
+namespace rtc {
+
+namespace {
+
+// Helper function roughly equivalent to std::async with policy std::launch::async
+// since std::async might be unreliable on some platforms (e.g. Mingw32 on Windows)
+template <class F, class... Args>
+std::future<std::result_of_t<std::decay_t<F>(std::decay_t<Args>...)>> thread_call(F &&f,
+                                                                                  Args &&... args) {
+	using R = std::result_of_t<std::decay_t<F>(std::decay_t<Args>...)>;
+	std::packaged_task<R()> task(std::bind(f, std::forward<Args>(args)...));
+	std::future<R> future = task.get_future();
+	std::thread t(std::move(task));
+	t.detach();
+	return future;
+}
+
+static std::unordered_map<string, future_certificate_ptr> CertificateCache;
+static std::mutex CertificateCacheMutex;
+
+} // namespace
+
+future_certificate_ptr make_certificate(string commonName) {
+	std::lock_guard lock(CertificateCacheMutex);
+
+	if (auto it = CertificateCache.find(commonName); it != CertificateCache.end())
+		return it->second;
+
+	auto future = thread_call(make_certificate_impl, commonName);
+	auto shared = future.share();
+	CertificateCache.emplace(std::move(commonName), shared);
+	return shared;
+}
+
+void CleanupCertificateCache() {
+	std::lock_guard lock(CertificateCacheMutex);
+	CertificateCache.clear();
+}
+
+} // namespace rtc

src/certificate.hpp

@@ -22,6 +22,7 @@
 #include "include.hpp"
 #include "tls.hpp"
 
+#include <future>
 #include <tuple>
 
 namespace rtc {
@@ -57,7 +58,12 @@ string make_fingerprint(gnutls_x509_crt_t crt);
 string make_fingerprint(X509 *x509);
 #endif
 
-std::shared_ptr<Certificate> make_certificate(const string &commonName);
+using certificate_ptr = std::shared_ptr<Certificate>;
+using future_certificate_ptr = std::shared_future<certificate_ptr>;
+
+future_certificate_ptr make_certificate(string commonName); // cached
+
+void CleanupCertificateCache();
 
 } // namespace rtc
 

src/dtlstransport.cpp

@@ -43,7 +43,7 @@ void DtlsTransport::Cleanup() {
 	// Nothing to do
 }
 
-DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certificate> certificate,
+DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr certificate,
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
     : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
       mVerifierCallback(std::move(verifierCallback)),
@@ -439,6 +439,7 @@ void DtlsTransport::runRecvLoop() {
 					int ret = SSL_read(mSsl, buffer, bufferSize);
 					if (!openssl::check(mSsl, ret))
 						break;
+
 					if (ret > 0)
 						recv(make_message(buffer, buffer + ret));
 				}

src/dtlstransport.hpp

@@ -43,7 +43,7 @@ public:
 
 	using verifier_callback = std::function<bool(const std::string &fingerprint)>;
 
-	DtlsTransport(std::shared_ptr<IceTransport> lower, std::shared_ptr<Certificate> certificate,
+	DtlsTransport(std::shared_ptr<IceTransport> lower, certificate_ptr certificate,
 	              verifier_callback verifierCallback, state_callback stateChangeCallback);
 	~DtlsTransport();
 
@@ -55,7 +55,7 @@ protected:
 	virtual void postHandshake();
 	void runRecvLoop();
 
-	const std::shared_ptr<Certificate> mCertificate;
+	const certificate_ptr mCertificate;
 	const verifier_callback mVerifierCallback;
 	const bool mIsClient;
 

src/icetransport.cpp

@@ -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();

src/init.cpp

@@ -18,6 +18,7 @@
 
 #include "init.hpp"
 
+#include "certificate.hpp"
 #include "dtlstransport.hpp"
 #include "sctptransport.hpp"
 #include "tls.hpp"
@@ -80,6 +81,7 @@ Init::Init() {
 }
 
 Init::~Init() {
+	CleanupCertificateCache();
 	SctpTransport::Cleanup();
 	DtlsTransport::Cleanup();
 #if RTC_ENABLE_WEBSOCKET

src/peerconnection.cpp

@@ -40,11 +40,17 @@ 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();
 }
@@ -305,10 +311,15 @@ shared_ptr<DtlsTransport> PeerConnection::initDtlsTransport() {
 		if (auto transport = std::atomic_load(&mDtlsTransport))
 			return transport;
 
+		auto certificate = mCertificate.get();
 		auto lower = std::atomic_load(&mIceTransport);
 		auto verifierCallback = weak_bind(&PeerConnection::checkFingerprint, this, _1);
 		auto stateChangeCallback = [this,
 		                            weak_this = weak_from_this()](DtlsTransport::State state) {
+			auto shared_this = weak_this.lock();
+			if (!shared_this)
+				return;
+
 			switch (state) {
 			case DtlsTransport::State::Connected:
 				initSctpTransport();
@@ -332,7 +343,7 @@ shared_ptr<DtlsTransport> PeerConnection::initDtlsTransport() {
 
 			// DTLS-SRTP
 			transport = std::make_shared<DtlsSrtpTransport>(
-			    lower, mCertificate, verifierCallback,
+			    lower, certificate, verifierCallback,
 			    std::bind(&PeerConnection::forwardMedia, this, _1), stateChangeCallback);
 #else
 			PLOG_WARNING << "Ignoring media support (not compiled with SRTP support)";
@@ -341,7 +352,7 @@ shared_ptr<DtlsTransport> PeerConnection::initDtlsTransport() {
 
 		if (!transport) {
 			// DTLS only
-			transport = std::make_shared<DtlsTransport>(lower, mCertificate, verifierCallback,
+			transport = std::make_shared<DtlsTransport>(lower, certificate, verifierCallback,
 			                                            stateChangeCallback);
 		}
 
@@ -416,6 +427,8 @@ 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);
 
@@ -578,9 +591,11 @@ void PeerConnection::processLocalDescription(Description description) {
 	if (auto remote = remoteDescription())
 		remoteSctpPort = remote->sctpPort();
 
+	auto certificate = mCertificate.get(); // wait for certificate if not ready
+
 	std::lock_guard lock(mLocalDescriptionMutex);
 	mLocalDescription.emplace(std::move(description));
-	mLocalDescription->setFingerprint(mCertificate->fingerprint());
+	mLocalDescription->setFingerprint(certificate->fingerprint());
 	mLocalDescription->setSctpPort(remoteSctpPort.value_or(DEFAULT_SCTP_PORT));
 	mLocalDescription->setMaxMessageSize(LOCAL_MAX_MESSAGE_SIZE);
 

src/rtc.cpp

@@ -208,7 +208,9 @@ int rtcDeleteDataChannel(int dc) {
 
 #if RTC_ENABLE_WEBSOCKET
 int rtcCreateWebSocket(const char *url) {
-	return emplaceWebSocket(std::make_shared<WebSocket>(url));
+	auto ws = std::make_shared<WebSocket>();
+	ws->open(url);
+	return emplaceWebSocket(ws);
 }
 
 int rtcDeleteWebsocket(int ws) {
@@ -515,3 +517,5 @@ int rtcReceiveMessage(int id, char *buffer, int *size) {
 		    *message);
 	});
 }
+
+void rtcCleanup() { rtc::Cleanup(); }

src/sctptransport.cpp

@@ -21,6 +21,7 @@
 #include <chrono>
 #include <exception>
 #include <iostream>
+#include <thread>
 #include <vector>
 
 #ifdef USE_JUICE
@@ -62,7 +63,10 @@ void SctpTransport::Init() {
 	usrsctp_sysctl_set_sctp_heartbeat_interval_default(10 * 1000); // ms
 }
 
-void SctpTransport::Cleanup() { usrsctp_finish(); }
+void SctpTransport::Cleanup() {
+	while (usrsctp_finish() != 0)
+		std::this_thread::sleep_for(100ms);
+}
 
 SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
                              message_callback recvCallback, amount_callback bufferedAmountCallback,

src/tcptransport.cpp

@@ -99,22 +99,30 @@ bool TcpTransport::stop() {
 	if (!Transport::stop())
 		return false;
 
-	PLOG_DEBUG << "Waiting TCP recv thread";
+	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) { recv(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
@@ -140,22 +148,40 @@ void TcpTransport::connect(const string &hostname, const string &service) {
 	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)
+	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) {
-			PLOG_WARNING << e.what();
+			if (p->ai_next) {
+				PLOG_DEBUG << e.what();
+			} else {
+				PLOG_WARNING << e.what();
+			}
 		}
+	}
 
 	freeaddrinfo(result);
-	throw std::runtime_error("Connection failed to \"" + hostname + ":" + service + "\"");
+
+	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 {
-		PLOG_DEBUG << "Creating TCP socket";
+		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);
@@ -166,17 +192,20 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 		if (::ioctlsocket(mSock, FIONBIO, &b) < 0)
 			throw std::runtime_error("Failed to set socket non-blocking mode");
 
-		IF_PLOG(plog::debug) {
-			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;
-			}
-		}
+#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
-		::connect(mSock, addr, addrlen);
+		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);
@@ -184,13 +213,29 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 		struct timeval tv;
 		tv.tv_sec = 10; // TODO
 		tv.tv_usec = 0;
-		int ret = ::select(SOCKET_TO_INT(mSock) + 1, NULL, &writefds, NULL, &tv);
+		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 || ::send(mSock, NULL, 0, MSG_NOSIGNAL) != 0)
-			throw std::runtime_error("Connection failed");
+		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) {
@@ -226,7 +271,12 @@ bool TcpTransport::trySendMessage(message_ptr &message) {
 	auto data = reinterpret_cast<const char *>(message->data());
 	auto size = message->size();
 	while (size) {
-		int len = ::send(mSock, data, size, MSG_NOSIGNAL);
+#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());
@@ -257,7 +307,6 @@ void TcpTransport::runLoop() {
 		return;
 	}
 
-
 	// Receive loop
 	try {
 		PLOG_INFO << "TCP connected";
@@ -266,9 +315,18 @@ void TcpTransport::runLoop() {
 		while (true) {
 			fd_set readfds, writefds;
 			int n = prepareSelect(readfds, writefds);
-			int ret = ::select(n, &readfds, &writefds, NULL, NULL);
-			if (ret < 0)
+
+			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();
@@ -280,7 +338,7 @@ void TcpTransport::runLoop() {
 					if (errno == EAGAIN || errno == EWOULDBLOCK) {
 						continue;
 					} else {
-						throw std::runtime_error("Connection lost, errno=" + to_string(sockerrno));
+						throw std::runtime_error("Connection lost");
 					}
 				}
 

src/tlstransport.cpp

@@ -46,31 +46,38 @@ void TlsTransport::Cleanup() {
 }
 
 TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_callback callback)
-    : Transport(lower, std::move(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 {
+        check_gnutls(gnutls_certificate_set_x509_system_trust(mCreds));
+        check_gnutls(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");
 
-		gnutls_session_set_ptr(mSession, this);
+       	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);
 
-		gnutls_server_name_set(mSession, GNUTLS_NAME_DNS, host.data(), host.size());
-
-		mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+       	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
 		registerIncoming();
 
 	} catch (...) {
 		gnutls_deinit(mSession);
+		gnutls_certificate_free_credentials(mCreds);
 		throw;
 	}
 }
@@ -79,6 +86,7 @@ TlsTransport::~TlsTransport() {
 	stop();
 
 	gnutls_deinit(mSession);
+	gnutls_certificate_free_credentials(mCreds);
 }
 
 bool TlsTransport::stop() {
@@ -92,11 +100,14 @@ bool TlsTransport::stop() {
 }
 
 bool TlsTransport::send(message_ptr message) {
-	if (!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());
@@ -182,16 +193,37 @@ ssize_t TlsTransport::WriteCallback(gnutls_transport_ptr_t ptr, const void *data
 
 ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen) {
 	TlsTransport *t = static_cast<TlsTransport *>(ptr);
-	if (auto next = t->mIncomingQueue.pop()) {
-		auto message = *next;
-		ssize_t len = std::min(maxlen, message->size());
-		std::memcpy(data, message->data(), len);
+
+	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;
 	}
-	// Closed
-	gnutls_transport_set_errno(t->mSession, 0);
-	return 0;
+	else {
+		// Closed
+		gnutls_transport_set_errno(t->mSession, 0);
+		return 0;
+	}
 }
 
 int TlsTransport::TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms) {
@@ -220,47 +252,62 @@ void TlsTransport::Cleanup() {
 }
 
 TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_callback callback)
-    : Transport(lower, std::move(callback)) {
+    : Transport(lower, std::move(callback)), mHost(std::move(host)) {
 
 	PLOG_DEBUG << "Initializing TLS transport (OpenSSL)";
 
-	if (!(mCtx = SSL_CTX_new(SSLv23_method()))) // version-flexible
-		throw std::runtime_error("Failed to create SSL context");
+	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);
 
-	openssl::check(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
-	               "Failed to set SSL priorities");
+		SSL_CTX_set_default_verify_paths(mCtx);
+		SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER, NULL);
+		SSL_CTX_set_verify_depth(mCtx, 4);
 
-	SSL_CTX_set_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);
+		if (!(mSsl = SSL_new(mCtx)))
+			throw std::runtime_error("Failed to create SSL instance");
 
-	SSL_CTX_set_default_verify_paths(mCtx);
-	SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER, NULL);
-	SSL_CTX_set_verify_depth(mCtx, 4);
+		SSL_set_ex_data(mSsl, TransportExIndex, this);
 
-	if (!(mSsl = SSL_new(mCtx)))
-		throw std::runtime_error("Failed to create SSL instance");
+		SSL_set_hostflags(mSsl, 0);
+		openssl::check(SSL_set1_host(mSsl, mHost.c_str()), "Failed to set SSL host");
 
-	SSL_set_ex_data(mSsl, TransportExIndex, this);
-	SSL_set_tlsext_host_name(mSsl, host.c_str());
+		PLOG_VERBOSE << "Server Name Indication: " << mHost;
+		SSL_set_tlsext_host_name(mSsl, mHost.c_str());
 
-	SSL_set_connect_state(mSsl);
+		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");
+		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);
+		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());
+		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();
 
-	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+	} catch (...) {
+		if (mSsl)
+			SSL_free(mSsl);
+		if (mCtx)
+			SSL_CTX_free(mCtx);
+		throw;
+	}
 }
 
 TlsTransport::~TlsTransport() {
@@ -282,17 +329,22 @@ bool TlsTransport::stop() {
 }
 
 bool TlsTransport::send(message_ptr message) {
-	if (!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 (int len = BIO_read(mOutBio, buffer, bufferSize))
-		outgoing(make_message(buffer, buffer + len));
+	while ((ret = BIO_read(mOutBio, buffer, bufferSize)) > 0)
+		outgoing(make_message(buffer, buffer + ret));
 
 	return true;
 }
@@ -311,34 +363,41 @@ void TlsTransport::runRecvLoop() {
 	try {
 		changeState(State::Connecting);
 
-		SSL_do_handshake(mSsl);
-		while (int len = BIO_read(mOutBio, buffer, bufferSize))
-			outgoing(make_message(buffer, buffer + len));
-
-		while (auto next = mIncomingQueue.pop()) {
-			message_ptr message = *next;
-			message_ptr decrypted;
-
-			BIO_write(mInBio, message->data(), message->size());
-
-			int ret = SSL_read(mSsl, buffer, bufferSize);
-			if (!openssl::check(mSsl, ret))
-				break;
+		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;
 
-			if (ret > 0)
-				decrypted = make_message(buffer, buffer + ret);
+				// Output
+				while ((ret = BIO_read(mOutBio, buffer, bufferSize)) > 0)
+					outgoing(make_message(buffer, buffer + ret));
 
-			while (int len = BIO_read(mOutBio, buffer, bufferSize))
-				outgoing(make_message(buffer, buffer + len));
+				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 (state() == State::Connecting && SSL_is_init_finished(mSsl)) {
-				PLOG_INFO << "TLS handshake finished";
-				changeState(State::Connected);
+				if (ret > 0)
+					recv(make_message(buffer, buffer + ret));
 			}
 
-			if (decrypted)
-				recv(decrypted);
+			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();
 	}

src/tlstransport.hpp

@@ -49,11 +49,17 @@ public:
 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);

src/websocket.cpp

@@ -33,11 +33,12 @@
 
 namespace rtc {
 
-WebSocket::WebSocket() {}
+WebSocket::WebSocket() { PLOG_VERBOSE << "Creating WebSocket"; }
 
-WebSocket::WebSocket(const string &url) : WebSocket() { open(url); }
-
-WebSocket::~WebSocket() { remoteClose(); }
+WebSocket::~WebSocket() {
+	PLOG_VERBOSE << "Destroying WebSocket";
+	remoteClose();
+}
 
 WebSocket::State WebSocket::readyState() const { return mState; }
 
@@ -76,6 +77,7 @@ void WebSocket::open(const string &url) {
 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();
@@ -85,8 +87,10 @@ void WebSocket::close() {
 }
 
 void WebSocket::remoteClose() {
-	close();
-	closeTransports();
+	if (mState.load() != State::Closed) {
+		close();
+		closeTransports();
+	}
 }
 
 bool WebSocket::send(const std::variant<binary, string> &data) {
@@ -283,7 +287,15 @@ std::shared_ptr<WsTransport> WebSocket::initWsTransport() {
 }
 
 void WebSocket::closeTransports() {
-	changeState(State::Closed);
+	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));

src/wstransport.cpp

@@ -78,32 +78,50 @@ bool WsTransport::send(message_ptr message) {
 		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) {
-	try {
+	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());
 
-		if (state() == State::Connecting) {
-			if (size_t len = readHttpResponse(mBuffer.data(), mBuffer.size())) {
-				mBuffer.erase(mBuffer.begin(), mBuffer.begin() + len);
-				PLOG_INFO << "WebSocket open";
-				changeState(State::Connected);
+		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)) {
-				mBuffer.erase(mBuffer.begin(), mBuffer.begin() + len);
-				recvFrame(frame);
+			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();
 		}
-	} catch (const std::exception &e) {
-		PLOG_ERROR << e.what();
 	}
 
 	if (state() == State::Connected) {
@@ -120,7 +138,7 @@ void WsTransport::close() {
 	if (state() == State::Connected) {
 		sendFrame({CLOSE, NULL, 0, true, true});
 		PLOG_INFO << "WebSocket closing";
-		changeState(State::Completed);
+		changeState(State::Disconnected);
 	}
 }
 
@@ -131,8 +149,8 @@ bool WsTransport::sendHttpRequest() {
 	random_bytes_engine generator(seed);
 
 	binary key(16);
-	std::generate(reinterpret_cast<uint8_t *>(key.data()),
-	              reinterpret_cast<uint8_t *>(key.data() + key.size()), generator);
+	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"
@@ -157,6 +175,7 @@ size_t WsTransport::readHttpResponse(const byte *buffer, size_t size) {
 	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');
@@ -251,7 +270,7 @@ size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
 		cur += 2;
 	} else if (frame.length == 0x7F) {
 		if (end - cur < 8)
-			return false;
+			return 0;
 		frame.length = ntohll(*reinterpret_cast<const uint64_t *>(cur));
 		cur += 8;
 	}
@@ -265,49 +284,63 @@ size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
 	}
 
 	if (end - cur < frame.length)
-		return false;
+		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 end - buffer;
+	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));
+			recv(make_message(frame.payload, frame.payload + frame.length, type));
 		} else {
 			mPartial.insert(mPartial.end(), frame.payload, frame.payload + frame.length);
-			mPartialOpcode = frame.opcode;
 		}
 		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()));
+			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: {
-		// TODO
+		PLOG_DEBUG << "WebSocket received pong";
 		break;
 	}
 	case CLOSE: {
@@ -324,6 +357,9 @@ void WsTransport::recvFrame(const Frame &frame) {
 }
 
 bool WsTransport::sendFrame(const Frame &frame) {
+	PLOG_DEBUG << "WebSocket sending frame: opcode=" << int(frame.opcode)
+	           << ", length=" << frame.length;
+
 	byte buffer[14];
 	byte *cur = buffer;
 
@@ -331,13 +367,13 @@ bool WsTransport::sendFrame(const Frame &frame) {
 
 	if (frame.length < 0x7E) {
 		*cur++ = byte((frame.length & 0x7F) | (frame.mask ? 0x80 : 0));
-	} else if (frame.length <= 0xFF) {
+	} else if (frame.length <= 0xFFFF) {
 		*cur++ = byte(0x7E | (frame.mask ? 0x80 : 0));
-		*reinterpret_cast<uint16_t *>(cur) = uint16_t(frame.length);
+		*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) = uint64_t(frame.length);
+		*reinterpret_cast<uint64_t *>(cur) = htonll(uint64_t(frame.length));
 		cur += 8;
 	}
 
@@ -345,9 +381,10 @@ bool WsTransport::sendFrame(const Frame &frame) {
 		auto seed = system_clock::now().time_since_epoch().count();
 		random_bytes_engine generator(seed);
 
-		auto *maskingKey = cur;
-		std::generate(reinterpret_cast<uint8_t *>(maskingKey),
-		              reinterpret_cast<uint8_t *>(maskingKey + 4), generator);
+		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)

test/capi.cpp

@@ -23,9 +23,12 @@
 #include <cstdlib>
 #include <cstring>
 
+#ifdef _WIN32
+#include <windows.h>
+static void sleep(unsigned int secs) { Sleep(secs * 1000); }
+#else
 #include <unistd.h> // for sleep
-
-using namespace std;
+#endif
 
 typedef struct {
 	rtcState state;
@@ -196,6 +199,10 @@ int test_capi_main() {
 	deletePeer(peer2);
 	sleep(1);
 
+	// You may call rtcCleanup() when finished to free static resources
+	rtcCleanup();
+	sleep(1);
+
 	printf("Success\n");
 	return 0;
 

test/connectivity.cpp

@@ -140,5 +140,9 @@ void test_connectivity() {
 	pc2->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;
 }

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 {
-		cout << endl << "*** Running connectivity test..." << endl;
+		cout << endl << "*** Running WebRTC connectivity test..." << endl;
 		test_connectivity();
-		cout << "*** Finished connectivity test" << endl;
+		cout << "*** Finished WebRTC connectivity test" << endl;
 	} catch (const exception &e) {
-		cerr << "Connectivity test failed: " << e.what() << endl;
+		cerr << "WebRTC connectivity test failed: " << e.what() << endl;
 		return -1;
 	}
 	try {
-		cout << endl << "*** Running C API test..." << endl;
+		cout << endl << "*** Running WebRTC C API test..." << endl;
 		test_capi();
-		cout << "*** Finished C API test" << endl;
+		cout << "*** Finished WebRTC C API test" << endl;
 	} catch (const exception &e) {
-		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/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
+