Merge pull request #82 from paullouisageneau/websocket-with-examples

WebSocket with examples

.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
+

.gitignore

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

.gitmodules

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

CMakeLists.txt

@@ -1,11 +1,12 @@
-cmake_minimum_required (VERSION 3.7)
-project (libdatachannel
+cmake_minimum_required(VERSION 3.7)
+project(libdatachannel
 	DESCRIPTION "WebRTC DataChannels Library"
 	VERSION 0.5.1
 	LANGUAGES CXX)
 
 option(USE_GNUTLS "Use GnuTLS instead of OpenSSL" OFF)
 option(USE_JUICE "Use libjuice instead of libnice" OFF)
+option(RTC_ENABLE_WEBSOCKET "Build WebSocket support" ON)
 
 if(USE_GNUTLS)
 	option(USE_NETTLE "Use Nettle instead of OpenSSL in libjuice" ON)
@@ -39,6 +40,14 @@ set(LIBDATACHANNEL_SOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/src/sctptransport.cpp
 )
 
+set(LIBDATACHANNEL_WEBSOCKET_SOURCES
+	${CMAKE_CURRENT_SOURCE_DIR}/src/base64.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tcptransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/tlstransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/websocket.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/wstransport.cpp
+)
+
 set(LIBDATACHANNEL_HEADERS
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/candidate.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/channel.hpp
@@ -55,20 +64,14 @@ set(LIBDATACHANNEL_HEADERS
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/reliability.hpp
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtc.h
 	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/rtc.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/include/rtc/websocket.hpp
 )
 
 set(TESTS_SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/test/main.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test/connectivity.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/test/capi.cpp
-)
-
-set(TESTS_OFFERER_SOURCES
-    ${CMAKE_CURRENT_SOURCE_DIR}/test/p2p/offerer.cpp
-)
-
-set(TESTS_ANSWERER_SOURCES
-    ${CMAKE_CURRENT_SOURCE_DIR}/test/p2p/answerer.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/test/websocket.cpp
 )
 
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
@@ -87,10 +90,30 @@ endif()
 add_library(Usrsctp::Usrsctp ALIAS usrsctp)
 add_library(Usrsctp::UsrsctpStatic ALIAS usrsctp-static)
 
-add_library(datachannel SHARED ${LIBDATACHANNEL_SOURCES})
+if (RTC_ENABLE_WEBSOCKET)
+	add_library(datachannel SHARED
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
+		${LIBDATACHANNEL_SOURCES}
+		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=1)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=1)
+else()
+	add_library(datachannel SHARED
+		${LIBDATACHANNEL_SOURCES})
+	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
+		${LIBDATACHANNEL_SOURCES})
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=0)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=0)
+endif()
+
 set_target_properties(datachannel PROPERTIES
 	VERSION ${PROJECT_VERSION}
 	CXX_STANDARD 17)
+set_target_properties(datachannel-static PROPERTIES
+	VERSION ${PROJECT_VERSION}
+	CXX_STANDARD 17)
 
 target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
 target_include_directories(datachannel PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/deps/plog/include)
@@ -99,11 +122,6 @@ target_include_directories(datachannel PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
 target_link_libraries(datachannel PUBLIC Threads::Threads)
 target_link_libraries(datachannel PRIVATE Usrsctp::UsrsctpStatic)
 
-add_library(datachannel-static STATIC EXCLUDE_FROM_ALL ${LIBDATACHANNEL_SOURCES})
-set_target_properties(datachannel-static PROPERTIES
-	VERSION ${PROJECT_VERSION}
-	CXX_STANDARD 17)
-
 target_include_directories(datachannel-static PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
 target_include_directories(datachannel-static PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/deps/plog/include)
 target_include_directories(datachannel-static PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include/rtc)
@@ -158,28 +176,19 @@ 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)
 

Jamfile

@@ -10,6 +10,7 @@ lib libdatachannel
 	<cxxstd>17
 	<include>./include/rtc
 	<define>USE_JUICE=1
+	<define>RTC_ENABLE_WEBSOCKET=0
 	<library>/libdatachannel//usrsctp
 	<library>/libdatachannel//juice
 	<library>/libdatachannel//plog

Makefile

@@ -38,6 +38,14 @@ else
         LIBS+=glib-2.0 gobject-2.0 nice
 endif
 
+RTC_ENABLE_WEBSOCKET ?= 1
+ifneq ($(RTC_ENABLE_WEBSOCKET), 0)
+        CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=1
+else
+        CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=0
+endif
+
+
 INCLUDES+=$(shell pkg-config --cflags $(LIBS))
 LDLIBS+=$(LOCALLIBS) $(shell pkg-config --libs $(LIBS))
 

README.md

@@ -1,16 +1,45 @@
-# 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

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
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+
+This section is intended to make thoroughly clear what is believed to
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+
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+may add an explicit geographical distribution limitation excluding
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+
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+
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+
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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
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+
+    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
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+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.
+
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+
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+
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examples/signaling-server-python/signaling-server.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+#
+# libdatachannel signaling server example
+# Copyright (c) 2020 Paul-Louis Ageneau
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import ssl
+import json
+import asyncio
+import logging
+import websockets
+
+
+logger = logging.getLogger('websockets')
+logger.setLevel(logging.INFO)
+logger.addHandler(logging.StreamHandler(sys.stdout))
+
+clients = {}
+
+
+async def handle_websocket(websocket, path):
+    client_id = None
+    try:
+        splitted = path.split('/')
+        splitted.pop(0)
+        client_id = splitted.pop(0)
+        print('Client {} connected'.format(client_id))
+
+        clients[client_id] = websocket
+        while True:
+            data = await websocket.recv()
+            print('Client {} << {}'.format(client_id, data))
+            message = json.loads(data)
+            destination_id = message['id']
+            destination_websocket = clients.get(destination_id)
+            if destination_websocket:
+                message['id'] = client_id
+                data = json.dumps(message)
+                print('Client {} >> {}'.format(destination_id, data))
+                await destination_websocket.send(data)
+            else:
+                print('Client {} not found'.format(destination_id))
+
+    except Exception as e:
+        print(e)
+
+    finally:
+        if client_id:
+            del clients[client_id]
+            print('Client {} disconnected'.format(client_id))
+
+if __name__ == '__main__':
+    port = int(sys.argv[1]) if len(sys.argv) > 1 else 8000
+    ssl_cert = sys.argv[2] if len(sys.argv) > 2 else None
+
+    if ssl_cert:
+        ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
+        ssl_context.load_cert_chain(ssl_cert)
+    else:
+        ssl_context = None
+
+    print('Listening on port {}'.format(port))
+    start_server = websockets.serve(handle_websocket, '127.0.0.1', port, ssl=ssl_context)
+    asyncio.get_event_loop().run_until_complete(start_server)
+    asyncio.get_event_loop().run_forever()

examples/signaling-server-rust/.gitignore

@@ -0,0 +1 @@
+/target

examples/signaling-server-rust/Cargo.lock

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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
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+
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+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     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/web/index.html

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

examples/web/package-lock.json

@@ -0,0 +1,119 @@
+{
+  "name": "libdatachannel-example-web",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "d": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/d/-/d-1.0.1.tgz",
+      "integrity": "sha512-m62ShEObQ39CfralilEQRjH6oAMtNCV1xJyEx5LpRYUVN+EviphDgUc/F3hnYbADmkiNs67Y+3ylmlG7Lnu+FA==",
+      "requires": {
+        "es5-ext": "^0.10.50",
+        "type": "^1.0.1"
+      }
+    },
+    "debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "es5-ext": {
+      "version": "0.10.53",
+      "resolved": "https://registry.npmjs.org/es5-ext/-/es5-ext-0.10.53.tgz",
+      "integrity": "sha512-Xs2Stw6NiNHWypzRTY1MtaG/uJlwCk8kH81920ma8mvN8Xq1gsfhZvpkImLQArw8AHnv8MT2I45J3c0R8slE+Q==",
+      "requires": {
+        "es6-iterator": "~2.0.3",
+        "es6-symbol": "~3.1.3",
+        "next-tick": "~1.0.0"
+      }
+    },
+    "es6-iterator": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.3.tgz",
+      "integrity": "sha1-p96IkUGgWpSwhUQDstCg+/qY87c=",
+      "requires": {
+        "d": "1",
+        "es5-ext": "^0.10.35",
+        "es6-symbol": "^3.1.1"
+      }
+    },
+    "es6-symbol": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.3.tgz",
+      "integrity": "sha512-NJ6Yn3FuDinBaBRWl/q5X/s4koRHBrgKAu+yGI6JCBeiu3qrcbJhwT2GeR/EXVfylRk8dpQVJoLEFhK+Mu31NA==",
+      "requires": {
+        "d": "^1.0.1",
+        "ext": "^1.1.2"
+      }
+    },
+    "ext": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/ext/-/ext-1.4.0.tgz",
+      "integrity": "sha512-Key5NIsUxdqKg3vIsdw9dSuXpPCQ297y6wBjL30edxwPgt2E44WcWBZey/ZvUc6sERLTxKdyCu4gZFmUbk1Q7A==",
+      "requires": {
+        "type": "^2.0.0"
+      },
+      "dependencies": {
+        "type": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/type/-/type-2.0.0.tgz",
+          "integrity": "sha512-KBt58xCHry4Cejnc2ISQAF7QY+ORngsWfxezO68+12hKV6lQY8P/psIkcbjeHWn7MqcgciWJyCCevFMJdIXpow=="
+        }
+      }
+    },
+    "is-typedarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz",
+      "integrity": "sha1-5HnICFjfDBsR3dppQPlgEfzaSpo="
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+    },
+    "nan": {
+      "version": "2.14.1",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.14.1.tgz",
+      "integrity": "sha512-isWHgVjnFjh2x2yuJ/tj3JbwoHu3UC2dX5G/88Cm24yB6YopVgxvBObDY7n5xW6ExmFhJpSEQqFPvq9zaXc8Jw=="
+    },
+    "next-tick": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/next-tick/-/next-tick-1.0.0.tgz",
+      "integrity": "sha1-yobR/ogoFpsBICCOPchCS524NCw="
+    },
+    "type": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/type/-/type-1.2.0.tgz",
+      "integrity": "sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg=="
+    },
+    "typedarray-to-buffer": {
+      "version": "3.1.5",
+      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
+      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+      "requires": {
+        "is-typedarray": "^1.0.0"
+      }
+    },
+    "websocket": {
+      "version": "1.0.31",
+      "resolved": "https://registry.npmjs.org/websocket/-/websocket-1.0.31.tgz",
+      "integrity": "sha512-VAouplvGKPiKFDTeCCO65vYHsyay8DqoBSlzIO3fayrfOgU94lQN5a1uWVnFrMLceTJw/+fQXR5PGbUVRaHshQ==",
+      "requires": {
+        "debug": "^2.2.0",
+        "es5-ext": "^0.10.50",
+        "nan": "^2.14.0",
+        "typedarray-to-buffer": "^3.1.5",
+        "yaeti": "^0.0.6"
+      }
+    },
+    "yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha1-8m9ITXJoTPQr7ft2lwqhYI+/lXc="
+    }
+  }
+}

examples/web/package.json

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

examples/web/script.js

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

examples/web/server.js

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

examples/web/style.css

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

include/rtc/datachannel.hpp

@@ -82,7 +82,6 @@ private:
 	std::atomic<bool> mIsClosed = false;
 
 	Queue<message_ptr> mRecvQueue;
-	std::atomic<size_t> mRecvAmount = 0;
 
 	friend class PeerConnection;
 };

include/rtc/include.hpp

@@ -19,6 +19,10 @@
 #ifndef RTC_INCLUDE_H
 #define RTC_INCLUDE_H
 
+#ifndef RTC_ENABLE_WEBSOCKET
+#define RTC_ENABLE_WEBSOCKET 1
+#endif
+
 #ifdef _WIN32
 #ifndef _WIN32_WINNT
 #define _WIN32_WINNT 0x0602
@@ -56,10 +60,21 @@ const uint16_t DEFAULT_SCTP_PORT = 5000; // SCTP port to use by default
 const size_t DEFAULT_MAX_MESSAGE_SIZE = 65536;    // Remote max message size if not specified in SDP
 const size_t LOCAL_MAX_MESSAGE_SIZE = 256 * 1024; // Local max message size
 
-
+// overloaded helper
 template <class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
 template <class... Ts> overloaded(Ts...)->overloaded<Ts...>;
 
+// weak_ptr bind helper
+template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t, Args &&... _args) {
+	return [bound = std::bind(f, t, _args...), weak_this = t->weak_from_this()](auto &&... args) {
+		using result_type = typename decltype(bound)::result_type;
+		if (auto shared_this = weak_this.lock())
+			return bound(args...);
+		else
+			return (result_type) false;
+	};
+}
+
 template <typename... P> class synchronized_callback {
 public:
 	synchronized_callback() = default;

include/rtc/message.hpp

@@ -30,6 +30,7 @@ namespace rtc {
 struct Message : binary {
 	enum Type { Binary, String, Control, Reset };
 
+	Message(const Message &message) = default;
 	Message(size_t size, Type type_ = Binary) : binary(size), type(type_) {}
 
 	template <typename Iterator>

include/rtc/peerconnection.hpp

@@ -99,9 +99,9 @@ public:
 	size_t bytesReceived();
 	std::optional<std::chrono::milliseconds> rtt();
 
-private:
-	init_token mInitToken = Init::Token();
+	std::string connectionInfo;
 
+private:
 	std::shared_ptr<IceTransport> initIceTransport(Description::Role role);
 	std::shared_ptr<DtlsTransport> initDtlsTransport();
 	std::shared_ptr<SctpTransport> initSctpTransport();
@@ -132,6 +132,8 @@ private:
 	const Configuration mConfig;
 	const future_certificate_ptr mCertificate;
 
+	init_token mInitToken = Init::Token();
+
 	std::optional<Description> mLocalDescription, mRemoteDescription;
 	mutable std::recursive_mutex mLocalDescriptionMutex, mRemoteDescriptionMutex;
 

include/rtc/queue.hpp

@@ -44,6 +44,7 @@ public:
 	void push(T element);
 	std::optional<T> pop();
 	std::optional<T> peek();
+	std::optional<T> exchange(T element);
 	bool wait(const std::optional<std::chrono::milliseconds> &duration = nullopt);
 
 private:
@@ -118,6 +119,16 @@ template <typename T> std::optional<T> Queue<T>::peek() {
 	}
 }
 
+template <typename T> std::optional<T> Queue<T>::exchange(T element) {
+	std::unique_lock lock(mMutex);
+	if (!mQueue.empty()) {
+		std::swap(mQueue.front(), element);
+		return std::optional<T>{element};
+	} else {
+		return nullopt;
+	}
+}
+
 template <typename T>
 bool Queue<T>::wait(const std::optional<std::chrono::milliseconds> &duration) {
 	std::unique_lock lock(mMutex);

include/rtc/rtc.h

@@ -27,6 +27,10 @@ extern "C" {
 
 // libdatachannel C API
 
+#ifndef RTC_ENABLE_WEBSOCKET
+#define RTC_ENABLE_WEBSOCKET 1
+#endif
+
 typedef enum {
 	RTC_NEW = 0,
 	RTC_CONNECTING = 1,
@@ -42,8 +46,7 @@ typedef enum {
 	RTC_GATHERING_COMPLETE = 2
 } rtcGatheringState;
 
-// Don't change, it must match plog severity
-typedef enum {
+typedef enum { // Don't change, it must match plog severity
 	RTC_LOG_NONE = 0,
 	RTC_LOG_FATAL = 1,
 	RTC_LOG_ERROR = 2,
@@ -76,10 +79,10 @@ typedef void (*availableCallbackFunc)(void *ptr);
 void rtcInitLogger(rtcLogLevel level);
 
 // User pointer
-void rtcSetUserPointer(int i, void *ptr);
+void rtcSetUserPointer(int id, void *ptr);
 
 // PeerConnection
-int rtcCreatePeerConnection(const rtcConfiguration *config);
+int rtcCreatePeerConnection(const rtcConfiguration *config); // returns pc id
 int rtcDeletePeerConnection(int pc);
 
 int rtcSetDataChannelCallback(int pc, dataChannelCallbackFunc cb);
@@ -95,24 +98,32 @@ int rtcGetLocalAddress(int pc, char *buffer, int size);
 int rtcGetRemoteAddress(int pc, char *buffer, int size);
 
 // DataChannel
-int rtcCreateDataChannel(int pc, const char *label);
+int rtcCreateDataChannel(int pc, const char *label); // returns dc id
 int rtcDeleteDataChannel(int dc);
 
 int rtcGetDataChannelLabel(int dc, char *buffer, int size);
-int rtcSetOpenCallback(int dc, openCallbackFunc cb);
-int rtcSetClosedCallback(int dc, closedCallbackFunc cb);
-int rtcSetErrorCallback(int dc, errorCallbackFunc cb);
-int rtcSetMessageCallback(int dc, messageCallbackFunc cb);
-int rtcSendMessage(int dc, const char *data, int size);
-
-int rtcGetBufferedAmount(int dc); // total size buffered to send
-int rtcSetBufferedAmountLowThreshold(int dc, int amount);
-int rtcSetBufferedAmountLowCallback(int dc, bufferedAmountLowCallbackFunc cb);
-
-// DataChannel extended API
-int rtcGetAvailableAmount(int dc); // total size available to receive
-int rtcSetAvailableCallback(int dc, availableCallbackFunc cb);
-int rtcReceiveMessage(int dc, char *buffer, int *size);
+
+// WebSocket
+#if RTC_ENABLE_WEBSOCKET
+int rtcCreateWebSocket(const char *url); // returns ws id
+int rtcDeleteWebsocket(int ws);
+#endif
+
+// DataChannel and WebSocket common API
+int rtcSetOpenCallback(int id, openCallbackFunc cb);
+int rtcSetClosedCallback(int id, closedCallbackFunc cb);
+int rtcSetErrorCallback(int id, errorCallbackFunc cb);
+int rtcSetMessageCallback(int id, messageCallbackFunc cb);
+int rtcSendMessage(int id, const char *data, int size);
+
+int rtcGetBufferedAmount(int id); // total size buffered to send
+int rtcSetBufferedAmountLowThreshold(int id, int amount);
+int rtcSetBufferedAmountLowCallback(int id, bufferedAmountLowCallbackFunc cb);
+
+// DataChannel and WebSocket common extended API
+int rtcGetAvailableAmount(int id); // total size available to receive
+int rtcSetAvailableCallback(int id, availableCallbackFunc cb);
+int rtcReceiveMessage(int id, char *buffer, int *size);
 
 // Cleanup
 void rtcCleanup();

include/rtc/rtc.hpp

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

include/rtc/websocket.hpp

@@ -0,0 +1,94 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_WEBSOCKET_H
+#define RTC_WEBSOCKET_H
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "channel.hpp"
+#include "include.hpp"
+#include "init.hpp"
+#include "message.hpp"
+#include "queue.hpp"
+
+#include <atomic>
+#include <optional>
+#include <thread>
+#include <variant>
+
+namespace rtc {
+
+class TcpTransport;
+class TlsTransport;
+class WsTransport;
+
+class WebSocket final : public Channel, public std::enable_shared_from_this<WebSocket> {
+public:
+	enum class State : int {
+		Connecting = 0,
+		Open = 1,
+		Closing = 2,
+		Closed = 3,
+	};
+
+	WebSocket();
+	~WebSocket();
+
+	State readyState() const;
+
+	void open(const string &url);
+	void close() override;
+	bool send(const std::variant<binary, string> &data) override;
+
+	bool isOpen() const override;
+	bool isClosed() const override;
+	size_t maxMessageSize() const override;
+
+	// Extended API
+	std::optional<std::variant<binary, string>> receive() override;
+	size_t availableAmount() const override; // total size available to receive
+
+private:
+	bool changeState(State state);
+	void remoteClose();
+	bool outgoing(mutable_message_ptr message);
+	void incoming(message_ptr message);
+
+	std::shared_ptr<TcpTransport> initTcpTransport();
+	std::shared_ptr<TlsTransport> initTlsTransport();
+	std::shared_ptr<WsTransport> initWsTransport();
+	void closeTransports();
+
+	init_token mInitToken = Init::Token();
+
+	std::shared_ptr<TcpTransport> mTcpTransport;
+	std::shared_ptr<TlsTransport> mTlsTransport;
+	std::shared_ptr<WsTransport> mWsTransport;
+	std::recursive_mutex mInitMutex;
+
+	string mScheme, mHost, mHostname, mService, mPath;
+	std::atomic<State> mState = State::Closed;
+
+	Queue<message_ptr> mRecvQueue;
+};
+} // namespace rtc
+
+#endif
+
+#endif // RTC_WEBSOCKET_H

src/base64.cpp

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

src/base64.hpp

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

src/datachannel.cpp

@@ -214,6 +214,9 @@ bool DataChannel::outgoing(mutable_message_ptr message) {
 }
 
 void DataChannel::incoming(message_ptr message) {
+	if (!message)
+		return;
+
 	switch (message->type) {
 	case Message::Control: {
 		auto raw = reinterpret_cast<const uint8_t *>(message->data());

src/dtlstransport.cpp

@@ -18,9 +18,7 @@
 
 #include "dtlstransport.hpp"
 #include "icetransport.hpp"
-#include "message.hpp"
 
-#include <cassert>
 #include <chrono>
 #include <cstring>
 #include <exception>
@@ -65,9 +63,8 @@ void DtlsTransport::Cleanup() {
 
 DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr certificate,
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
-    : Transport(lower), mCertificate(certificate), mState(State::Disconnected),
-      mVerifierCallback(std::move(verifierCallback)),
-      mStateChangeCallback(std::move(stateChangeCallback)) {
+    : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
+      mVerifierCallback(std::move(verifierCallback)) {
 
 	PLOG_DEBUG << "Initializing DTLS transport (GnuTLS)";
 
@@ -75,31 +72,37 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr cer
 	unsigned int flags = GNUTLS_DATAGRAM | (active ? GNUTLS_CLIENT : GNUTLS_SERVER);
 	check_gnutls(gnutls_init(&mSession, flags));
 
-	// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
-	// Therefore, the DTLS layer MUST NOT use any compression algorithm.
-	// See https://tools.ietf.org/html/rfc8261#section-5
-	const char *priorities = "SECURE128:-VERS-SSL3.0:-ARCFOUR-128:-COMP-ALL:+COMP-NULL";
-	const char *err_pos = NULL;
-	check_gnutls(gnutls_priority_set_direct(mSession, priorities, &err_pos),
-	             "Unable to set TLS priorities");
-
-	gnutls_certificate_set_verify_function(mCertificate->credentials(), CertificateCallback);
-	check_gnutls(
-	    gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, mCertificate->credentials()));
-
-	gnutls_dtls_set_timeouts(mSession,
-	                         1000,   // 1s retransmission timeout recommended by RFC 6347
-	                         30000); // 30s total timeout
-	gnutls_handshake_set_timeout(mSession, 30000);
-
-	gnutls_session_set_ptr(mSession, this);
-	gnutls_transport_set_ptr(mSession, this);
-	gnutls_transport_set_push_function(mSession, WriteCallback);
-	gnutls_transport_set_pull_function(mSession, ReadCallback);
-	gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
-
-	mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
-	registerIncoming();
+	try {
+		// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
+		// Therefore, the DTLS layer MUST NOT use any compression algorithm.
+		// See https://tools.ietf.org/html/rfc8261#section-5
+		const char *priorities = "SECURE128:-VERS-SSL3.0:-ARCFOUR-128:-COMP-ALL:+COMP-NULL";
+		const char *err_pos = NULL;
+		check_gnutls(gnutls_priority_set_direct(mSession, priorities, &err_pos),
+		             "Failed to set TLS priorities");
+
+		gnutls_certificate_set_verify_function(mCertificate->credentials(), CertificateCallback);
+		check_gnutls(
+		    gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, mCertificate->credentials()));
+
+		gnutls_dtls_set_timeouts(mSession,
+		                         1000,   // 1s retransmission timeout recommended by RFC 6347
+		                         30000); // 30s total timeout
+		gnutls_handshake_set_timeout(mSession, 30000);
+
+		gnutls_session_set_ptr(mSession, this);
+		gnutls_transport_set_ptr(mSession, this);
+		gnutls_transport_set_push_function(mSession, WriteCallback);
+		gnutls_transport_set_pull_function(mSession, ReadCallback);
+		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
+
+		mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
+		registerIncoming();
+
+	} catch (...) {
+		gnutls_deinit(mSession);
+		throw;
+	}
 }
 
 DtlsTransport::~DtlsTransport() {
@@ -108,8 +111,6 @@ DtlsTransport::~DtlsTransport() {
 	gnutls_deinit(mSession);
 }
 
-DtlsTransport::State DtlsTransport::state() const { return mState; }
-
 bool DtlsTransport::stop() {
 	if (!Transport::stop())
 		return false;
@@ -121,7 +122,7 @@ bool DtlsTransport::stop() {
 }
 
 bool DtlsTransport::send(message_ptr message) {
-	if (!message || mState != State::Connected)
+	if (!message || state() != State::Connected)
 		return false;
 
 	PLOG_VERBOSE << "Send size=" << message->size();
@@ -147,11 +148,6 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
-void DtlsTransport::changeState(State state) {
-	if (mState.exchange(state) != state)
-		mStateChangeCallback(state);
-}
-
 void DtlsTransport::runRecvLoop() {
 	const size_t maxMtu = 4096;
 
@@ -168,7 +164,7 @@ void DtlsTransport::runRecvLoop() {
 				throw std::runtime_error("MTU is too low");
 
 		} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ||
-		         !check_gnutls(ret, "TLS handshake failed"));
+		         !check_gnutls(ret, "DTLS handshake failed"));
 
 		// RFC 8261: DTLS MUST support sending messages larger than the current path MTU
 		// See https://tools.ietf.org/html/rfc8261#section-5
@@ -182,7 +178,7 @@ void DtlsTransport::runRecvLoop() {
 
 	// Receive loop
 	try {
-		PLOG_INFO << "DTLS handshake done";
+		PLOG_INFO << "DTLS handshake finished";
 		changeState(State::Connected);
 
 		const size_t bufferSize = maxMtu;
@@ -217,7 +213,7 @@ void DtlsTransport::runRecvLoop() {
 
 	gnutls_bye(mSession, GNUTLS_SHUT_RDWR);
 
-	PLOG_INFO << "DTLS disconnected";
+	PLOG_INFO << "DTLS closed";
 	changeState(State::Disconnected);
 	recv(nullptr);
 }
@@ -340,7 +336,7 @@ void DtlsTransport::Init() {
 	if (!BioMethods) {
 		BioMethods = BIO_meth_new(BIO_TYPE_BIO, "DTLS writer");
 		if (!BioMethods)
-			throw std::runtime_error("Unable to BIO methods for DTLS writer");
+			throw std::runtime_error("Failed to create BIO methods for DTLS writer");
 		BIO_meth_set_create(BioMethods, BioMethodNew);
 		BIO_meth_set_destroy(BioMethods, BioMethodFree);
 		BIO_meth_set_write(BioMethods, BioMethodWrite);
@@ -357,60 +353,68 @@ void DtlsTransport::Cleanup() {
 
 DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certificate> certificate,
                              verifier_callback verifierCallback, state_callback stateChangeCallback)
-    : Transport(lower), mCertificate(certificate), mState(State::Disconnected),
-      mVerifierCallback(std::move(verifierCallback)),
-      mStateChangeCallback(std::move(stateChangeCallback)) {
+    : Transport(lower, std::move(stateChangeCallback)), mCertificate(certificate),
+      mVerifierCallback(std::move(verifierCallback)) {
 
 	PLOG_DEBUG << "Initializing DTLS transport (OpenSSL)";
 
-	if (!(mCtx = SSL_CTX_new(DTLS_method())))
-		throw std::runtime_error("Unable to create SSL context");
-
-	check_openssl(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
-	              "Unable to set SSL priorities");
-
-	// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
-	// Therefore, the DTLS layer MUST NOT use any compression algorithm.
-	// See https://tools.ietf.org/html/rfc8261#section-5
-	SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3 | SSL_OP_NO_COMPRESSION | SSL_OP_NO_QUERY_MTU);
-	SSL_CTX_set_min_proto_version(mCtx, DTLS1_VERSION);
-	SSL_CTX_set_read_ahead(mCtx, 1);
-	SSL_CTX_set_quiet_shutdown(mCtx, 1);
-	SSL_CTX_set_info_callback(mCtx, InfoCallback);
-	SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
-	                   CertificateCallback);
-	SSL_CTX_set_verify_depth(mCtx, 1);
-
-	auto [x509, pkey] = mCertificate->credentials();
-	SSL_CTX_use_certificate(mCtx, x509);
-	SSL_CTX_use_PrivateKey(mCtx, pkey);
-
-	check_openssl(SSL_CTX_check_private_key(mCtx), "SSL local private key check failed");
-
-	if (!(mSsl = SSL_new(mCtx)))
-		throw std::runtime_error("Unable to create SSL instance");
-
-	SSL_set_ex_data(mSsl, TransportExIndex, this);
-
-	if (lower->role() == Description::Role::Active)
-		SSL_set_connect_state(mSsl);
-	else
-		SSL_set_accept_state(mSsl);
-
-	if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BioMethods)))
-		throw std::runtime_error("Unable to create BIO");
-
-	BIO_set_mem_eof_return(mInBio, BIO_EOF);
-	BIO_set_data(mOutBio, this);
-	SSL_set_bio(mSsl, mInBio, mOutBio);
+	try {
+		if (!(mCtx = SSL_CTX_new(DTLS_method())))
+			throw std::runtime_error("Failed to create SSL context");
 
-	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());
+		check_openssl(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
+		              "Failed to set SSL priorities");
 
-	mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
-	registerIncoming();
+		// RFC 8261: SCTP performs segmentation and reassembly based on the path MTU.
+		// Therefore, the DTLS layer MUST NOT use any compression algorithm.
+		// See https://tools.ietf.org/html/rfc8261#section-5
+		SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3 | SSL_OP_NO_COMPRESSION | SSL_OP_NO_QUERY_MTU);
+		SSL_CTX_set_min_proto_version(mCtx, DTLS1_VERSION);
+		SSL_CTX_set_read_ahead(mCtx, 1);
+		SSL_CTX_set_quiet_shutdown(mCtx, 1);
+		SSL_CTX_set_info_callback(mCtx, InfoCallback);
+		SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+		                   CertificateCallback);
+		SSL_CTX_set_verify_depth(mCtx, 1);
+
+		auto [x509, pkey] = mCertificate->credentials();
+		SSL_CTX_use_certificate(mCtx, x509);
+		SSL_CTX_use_PrivateKey(mCtx, pkey);
+
+		check_openssl(SSL_CTX_check_private_key(mCtx), "SSL local private key check failed");
+
+		if (!(mSsl = SSL_new(mCtx)))
+			throw std::runtime_error("Failed to create SSL instance");
+
+		SSL_set_ex_data(mSsl, TransportExIndex, this);
+
+		if (lower->role() == Description::Role::Active)
+			SSL_set_connect_state(mSsl);
+		else
+			SSL_set_accept_state(mSsl);
+
+		if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BioMethods)))
+			throw std::runtime_error("Failed to create BIO");
+
+		BIO_set_mem_eof_return(mInBio, BIO_EOF);
+		BIO_set_data(mOutBio, this);
+		SSL_set_bio(mSsl, mInBio, mOutBio);
+
+		auto ecdh = unique_ptr<EC_KEY, decltype(&EC_KEY_free)>(
+		    EC_KEY_new_by_curve_name(NID_X9_62_prime256v1), EC_KEY_free);
+		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
+		SSL_set_tmp_ecdh(mSsl, ecdh.get());
+
+		mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
+		registerIncoming();
+
+	} catch (...) {
+		if (mSsl)
+			SSL_free(mSsl);
+		if (mCtx)
+			SSL_CTX_free(mCtx);
+		throw;
+	}
 }
 
 DtlsTransport::~DtlsTransport() {
@@ -431,18 +435,14 @@ bool DtlsTransport::stop() {
 	return true;
 }
 
-DtlsTransport::State DtlsTransport::state() const { return mState; }
-
 bool DtlsTransport::send(message_ptr message) {
-	if (!message || mState != State::Connected)
+	if (!message || state() != State::Connected)
 		return false;
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
 	int ret = SSL_write(mSsl, message->data(), message->size());
-	if (!check_openssl_ret(mSsl, ret))
-		return false;
-	return true;
+	return check_openssl_ret(mSsl, ret);
 }
 
 void DtlsTransport::incoming(message_ptr message) {
@@ -455,11 +455,6 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
-void DtlsTransport::changeState(State state) {
-	if (mState.exchange(state) != state)
-		mStateChangeCallback(state);
-}
-
 void DtlsTransport::runRecvLoop() {
 	const size_t maxMtu = 4096;
 	try {
@@ -478,7 +473,7 @@ void DtlsTransport::runRecvLoop() {
 				auto message = *mIncomingQueue.pop();
 				BIO_write(mInBio, message->data(), message->size());
 
-				if (mState == State::Connecting) {
+				if (state() == State::Connecting) {
 					// Continue the handshake
 					int ret = SSL_do_handshake(mSsl);
 					if (!check_openssl_ret(mSsl, ret, "Handshake failed"))
@@ -489,13 +484,14 @@ void DtlsTransport::runRecvLoop() {
 						// MTU See https://tools.ietf.org/html/rfc8261#section-5
 						SSL_set_mtu(mSsl, maxMtu + 1);
 
-						PLOG_INFO << "DTLS handshake done";
+						PLOG_INFO << "DTLS handshake finished";
 						changeState(State::Connected);
 					}
 				} else {
 					int ret = SSL_read(mSsl, buffer, bufferSize);
 					if (!check_openssl_ret(mSsl, ret))
 						break;
+
 					if (ret > 0)
 						recv(make_message(buffer, buffer + ret));
 				}
@@ -503,7 +499,7 @@ void DtlsTransport::runRecvLoop() {
 
 			// No more messages pending, retransmit and rearm timeout if connecting
 			std::optional<milliseconds> duration;
-			if (mState == State::Connecting) {
+			if (state() == State::Connecting) {
 				// Warning: This function breaks the usual return value convention
 				int ret = DTLSv1_handle_timeout(mSsl);
 				if (ret < 0) {
@@ -513,7 +509,7 @@ void DtlsTransport::runRecvLoop() {
 				}
 
 				struct timeval timeout = {};
-				if (mState == State::Connecting && DTLSv1_get_timeout(mSsl, &timeout)) {
+				if (state() == State::Connecting && DTLSv1_get_timeout(mSsl, &timeout)) {
 					duration = milliseconds(timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
 					// Also handle handshake timeout manually because OpenSSL actually doesn't...
 					// OpenSSL backs off exponentially in base 2 starting from the recommended 1s
@@ -534,8 +530,8 @@ void DtlsTransport::runRecvLoop() {
 		PLOG_ERROR << "DTLS recv: " << e.what();
 	}
 
-	if (mState == State::Connected) {
-		PLOG_INFO << "DTLS disconnected";
+	if (state() == State::Connected) {
+		PLOG_INFO << "DTLS closed";
 		changeState(State::Disconnected);
 		recv(nullptr);
 	} else {

src/dtlstransport.hpp

@@ -46,33 +46,25 @@ public:
 	static void Init();
 	static void Cleanup();
 
-	enum class State { Disconnected, Connecting, Connected, Failed };
-
 	using verifier_callback = std::function<bool(const std::string &fingerprint)>;
-	using state_callback = std::function<void(State state)>;
 
 	DtlsTransport(std::shared_ptr<IceTransport> lower, certificate_ptr certificate,
 	              verifier_callback verifierCallback, state_callback stateChangeCallback);
 	~DtlsTransport();
 
-	State state() const;
-
 	bool stop() override;
 	bool send(message_ptr message) override; // false if dropped
 
 private:
 	void incoming(message_ptr message) override;
-	void changeState(State state);
 	void runRecvLoop();
 
 	const certificate_ptr mCertificate;
 
 	Queue<message_ptr> mIncomingQueue;
-	std::atomic<State> mState;
 	std::thread mRecvThread;
 
 	verifier_callback mVerifierCallback;
-	state_callback mStateChangeCallback;
 
 #if USE_GNUTLS
 	gnutls_session_t mSession;
@@ -82,8 +74,8 @@ private:
 	static ssize_t ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen);
 	static int TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms);
 #else
-	SSL_CTX *mCtx;
-	SSL *mSsl;
+	SSL_CTX *mCtx = NULL;
+	SSL *mSsl = NULL;
 	BIO *mInBio, *mOutBio;
 
 	static BIO_METHOD *BioMethods;

src/icetransport.cpp

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

src/icetransport.hpp

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

src/init.cpp

@@ -22,6 +22,10 @@
 #include "dtlstransport.hpp"
 #include "sctptransport.hpp"
 
+#if RTC_ENABLE_WEBSOCKET
+#include "tlstransport.hpp"
+#endif
+
 #ifdef _WIN32
 #include <winsock2.h>
 #endif
@@ -70,14 +74,20 @@ Init::Init() {
 	ERR_load_crypto_strings();
 #endif
 
-	DtlsTransport::Init();
 	SctpTransport::Init();
+	DtlsTransport::Init();
+#if RTC_ENABLE_WEBSOCKET
+	TlsTransport::Init();
+#endif
 }
 
 Init::~Init() {
 	CleanupCertificateCache();
-	DtlsTransport::Cleanup();
 	SctpTransport::Cleanup();
+	DtlsTransport::Cleanup();
+#if RTC_ENABLE_WEBSOCKET
+	TlsTransport::Cleanup();
+#endif
 
 #ifdef _WIN32
 	WSACleanup();

src/peerconnection.cpp

@@ -23,7 +23,6 @@
 #include "include.hpp"
 #include "sctptransport.hpp"
 
-#include <iostream>
 #include <thread>
 
 namespace rtc {
@@ -33,32 +32,21 @@ using namespace std::placeholders;
 using std::shared_ptr;
 using std::weak_ptr;
 
-template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t, Args &&... _args) {
-	return [bound = std::bind(f, t, _args...), weak_this = t->weak_from_this()](auto &&... args) {
-		if (auto shared_this = weak_this.lock())
-			bound(args...);
-	};
-}
-
-template <typename F, typename T, typename... Args>
-auto weak_bind_verifier(F &&f, T *t, Args &&... _args) {
-	return [bound = std::bind(f, t, _args...), weak_this = t->weak_from_this()](auto &&... args) {
-		if (auto shared_this = weak_this.lock())
-			return bound(args...);
-		else
-			return false;
-	};
-}
-
 PeerConnection::PeerConnection() : PeerConnection(Configuration()) {}
 
 PeerConnection::PeerConnection(const Configuration &config)
     : mConfig(config), mCertificate(make_certificate("libdatachannel")), mState(State::New),
-      mGatheringState(GatheringState::New) {}
+      mGatheringState(GatheringState::New) {
+	PLOG_VERBOSE << "Creating PeerConnection";
+}
 
-PeerConnection::~PeerConnection() { close(); }
+PeerConnection::~PeerConnection() {
+	close();
+	PLOG_VERBOSE << "Destroying PeerConnection";
+}
 
 void PeerConnection::close() {
+	PLOG_VERBOSE << "Closing PeerConnection";
 	closeDataChannels();
 	closeTransports();
 }
@@ -272,7 +260,7 @@ shared_ptr<DtlsTransport> PeerConnection::initDtlsTransport() {
 		auto certificate = mCertificate.get();
 		auto lower = std::atomic_load(&mIceTransport);
 		auto transport = std::make_shared<DtlsTransport>(
-		    lower, certificate, weak_bind_verifier(&PeerConnection::checkFingerprint, this, _1),
+		    lower, certificate, weak_bind(&PeerConnection::checkFingerprint, this, _1),
 		    [this, weak_this = weak_from_this()](DtlsTransport::State state) {
 			    auto shared_this = weak_this.lock();
 			    if (!shared_this)
@@ -357,6 +345,8 @@ 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);
 

src/rtc.cpp

@@ -16,10 +16,15 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "datachannel.hpp"
 #include "include.hpp"
+
+#include "datachannel.hpp"
 #include "peerconnection.hpp"
 
+#if RTC_ENABLE_WEBSOCKET
+#include "websocket.hpp"
+#endif
+
 #include <rtc.h>
 
 #include <exception>
@@ -43,6 +48,9 @@ namespace {
 
 std::unordered_map<int, shared_ptr<PeerConnection>> peerConnectionMap;
 std::unordered_map<int, shared_ptr<DataChannel>> dataChannelMap;
+#if RTC_ENABLE_WEBSOCKET
+std::unordered_map<int, shared_ptr<WebSocket>> webSocketMap;
+#endif
 std::unordered_map<int, void *> userPointerMap;
 std::mutex mutex;
 int lastId = 0;
@@ -103,6 +111,40 @@ bool eraseDataChannel(int dc) {
 	return true;
 }
 
+#if RTC_ENABLE_WEBSOCKET
+shared_ptr<WebSocket> getWebSocket(int id) {
+	std::lock_guard lock(mutex);
+	auto it = webSocketMap.find(id);
+	return it != webSocketMap.end() ? it->second : nullptr;
+}
+
+int emplaceWebSocket(shared_ptr<WebSocket> ptr) {
+	std::lock_guard lock(mutex);
+	int ws = ++lastId;
+	webSocketMap.emplace(std::make_pair(ws, ptr));
+	return ws;
+}
+
+bool eraseWebSocket(int ws) {
+	std::lock_guard lock(mutex);
+	if (webSocketMap.erase(ws) == 0)
+		return false;
+	userPointerMap.erase(ws);
+	return true;
+}
+#endif
+
+shared_ptr<Channel> getChannel(int id) {
+	std::lock_guard lock(mutex);
+	if (auto it = dataChannelMap.find(id); it != dataChannelMap.end())
+		return it->second;
+#if RTC_ENABLE_WEBSOCKET
+	if (auto it = webSocketMap.find(id); it != webSocketMap.end())
+		return it->second;
+#endif
+	return nullptr;
+}
+
 } // namespace
 
 void rtcInitLogger(rtcLogLevel level) { InitLogger(static_cast<LogLevel>(level)); }
@@ -164,6 +206,31 @@ int rtcDeleteDataChannel(int dc) {
 	return 0;
 }
 
+#if RTC_ENABLE_WEBSOCKET
+int rtcCreateWebSocket(const char *url) {
+	auto ws = std::make_shared<WebSocket>();
+	ws->open(url);
+	return emplaceWebSocket(ws);
+}
+
+int rtcDeleteWebsocket(int ws) {
+	auto webSocket = getWebSocket(ws);
+	if (!webSocket)
+		return -1;
+
+	webSocket->onOpen(nullptr);
+	webSocket->onClosed(nullptr);
+	webSocket->onError(nullptr);
+	webSocket->onMessage(nullptr);
+	webSocket->onBufferedAmountLow(nullptr);
+	webSocket->onAvailable(nullptr);
+
+	eraseWebSocket(ws);
+	return 0;
+}
+
+#endif
+
 int rtcSetDataChannelCallback(int pc, dataChannelCallbackFunc cb) {
 	auto peerConnection = getPeerConnection(pc);
 	if (!peerConnection)
@@ -298,135 +365,135 @@ int rtcGetDataChannelLabel(int dc, char *buffer, int size) {
 	return size + 1;
 }
 
-int rtcSetOpenCallback(int dc, openCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSetOpenCallback(int id, openCallbackFunc cb) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onOpen([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onOpen(nullptr);
+		channel->onOpen(nullptr);
 	return 0;
 }
 
-int rtcSetClosedCallback(int dc, closedCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSetClosedCallback(int id, closedCallbackFunc cb) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onClosed([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onClosed([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onClosed(nullptr);
+		channel->onClosed(nullptr);
 	return 0;
 }
 
-int rtcSetErrorCallback(int dc, errorCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSetErrorCallback(int id, errorCallbackFunc cb) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onError(
-		    [dc, cb](const string &error) { cb(error.c_str(), getUserPointer(dc)); });
+		channel->onError([id, cb](const string &error) { cb(error.c_str(), getUserPointer(id)); });
 	else
-		dataChannel->onError(nullptr);
+		channel->onError(nullptr);
 	return 0;
 }
 
-int rtcSetMessageCallback(int dc, messageCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSetMessageCallback(int id, messageCallbackFunc cb) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onMessage(
-		    [dc, cb](const binary &b) {
-			    cb(reinterpret_cast<const char *>(b.data()), b.size(), getUserPointer(dc));
+		channel->onMessage(
+		    [id, cb](const binary &b) {
+			    cb(reinterpret_cast<const char *>(b.data()), b.size(), getUserPointer(id));
 		    },
-		    [dc, cb](const string &s) { cb(s.c_str(), -1, getUserPointer(dc)); });
+		    [id, cb](const string &s) { cb(s.c_str(), -1, getUserPointer(id)); });
 	else
-		dataChannel->onMessage(nullptr);
+		channel->onMessage(nullptr);
 
 	return 0;
 }
 
-int rtcSendMessage(int dc, const char *data, int size) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSendMessage(int id, const char *data, int size) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (size >= 0) {
 		auto b = reinterpret_cast<const byte *>(data);
-		CATCH(dataChannel->send(b, size));
+		CATCH(channel->send(binary(b, b + size)));
 		return size;
 	} else {
-		string s(data);
-		CATCH(dataChannel->send(s));
-		return s.size();
+		string str(data);
+		int len = str.size();
+		CATCH(channel->send(std::move(str)));
+		return len;
 	}
 }
 
-int rtcGetBufferedAmount(int dc) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcGetBufferedAmount(int id) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
-	CATCH(return int(dataChannel->bufferedAmount()));
+	CATCH(return int(channel->bufferedAmount()));
 }
 
-int rtcSetBufferedAmountLowThreshold(int dc, int amount) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSetBufferedAmountLowThreshold(int id, int amount) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
-	CATCH(dataChannel->setBufferedAmountLowThreshold(size_t(amount)));
+	CATCH(channel->setBufferedAmountLowThreshold(size_t(amount)));
 	return 0;
 }
 
-int rtcSetBufferedAmountLowCallback(int dc, bufferedAmountLowCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSetBufferedAmountLowCallback(int id, bufferedAmountLowCallbackFunc cb) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onBufferedAmountLow([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onBufferedAmountLow([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onBufferedAmountLow(nullptr);
+		channel->onBufferedAmountLow(nullptr);
 	return 0;
 }
 
-int rtcGetAvailableAmount(int dc) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcGetAvailableAmount(int id) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
-	CATCH(return int(dataChannel->availableAmount()));
+	CATCH(return int(channel->availableAmount()));
 }
 
-int rtcSetAvailableCallback(int dc, availableCallbackFunc cb) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcSetAvailableCallback(int id, availableCallbackFunc cb) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (cb)
-		dataChannel->onOpen([dc, cb]() { cb(getUserPointer(dc)); });
+		channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
 	else
-		dataChannel->onOpen(nullptr);
+		channel->onOpen(nullptr);
 	return 0;
 }
 
-int rtcReceiveMessage(int dc, char *buffer, int *size) {
-	auto dataChannel = getDataChannel(dc);
-	if (!dataChannel)
+int rtcReceiveMessage(int id, char *buffer, int *size) {
+	auto channel = getChannel(id);
+	if (!channel)
 		return -1;
 
 	if (!size)
 		return -1;
 
 	CATCH({
-		auto message = dataChannel->receive();
+		auto message = channel->receive();
 		if (!message)
 			return 0;
 

src/sctptransport.cpp

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

src/sctptransport.hpp

@@ -38,17 +38,12 @@ public:
 	static void Init();
 	static void Cleanup();
 
-	enum class State { Disconnected, Connecting, Connected, Failed };
-
 	using amount_callback = std::function<void(uint16_t streamId, size_t amount)>;
-	using state_callback = std::function<void(State state)>;
 
 	SctpTransport(std::shared_ptr<Transport> lower, uint16_t port, message_callback recvCallback,
 	              amount_callback bufferedAmountCallback, state_callback stateChangeCallback);
 	~SctpTransport();
 
-	State state() const;
-
 	bool stop() override;
 	bool send(message_ptr message) override; // false if buffered
 	void close(unsigned int stream);
@@ -76,7 +71,6 @@ private:
 	void connect();
 	void shutdown();
 	void incoming(message_ptr message) override;
-	void changeState(State state);
 
 	bool trySendQueue();
 	bool trySendMessage(message_ptr message);
@@ -105,14 +99,11 @@ private:
 	std::atomic<bool> mWritten = false; // written outside lock
 	bool mWrittenOnce = false;
 
-	state_callback mStateChangeCallback;
-	std::atomic<State> mState;
+	binary mPartialRecv, mPartialStringData, mPartialBinaryData;
 
 	// Stats
 	std::atomic<size_t> mBytesSent = 0, mBytesReceived = 0;
 
-	binary mPartialRecv, mPartialStringData, mPartialBinaryData;
-
 	static int RecvCallback(struct socket *sock, union sctp_sockstore addr, void *data, size_t len,
 	                        struct sctp_rcvinfo recv_info, int flags, void *user_data);
 	static int SendCallback(struct socket *sock, uint32_t sb_free);

src/tcptransport.cpp

@@ -0,0 +1,378 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "tcptransport.hpp"
+
+#include <exception>
+#ifndef _WIN32
+#include <fcntl.h>
+#include <unistd.h>
+#endif
+
+namespace rtc {
+
+using std::to_string;
+
+SelectInterrupter::SelectInterrupter() {
+#ifndef _WIN32
+	int pipefd[2];
+	if (::pipe(pipefd) != 0)
+		throw std::runtime_error("Failed to create pipe");
+	::fcntl(pipefd[0], F_SETFL, O_NONBLOCK);
+	::fcntl(pipefd[1], F_SETFL, O_NONBLOCK);
+	mPipeOut = pipefd[0]; // read
+	mPipeIn = pipefd[1];  // write
+#endif
+}
+
+SelectInterrupter::~SelectInterrupter() {
+	std::lock_guard lock(mMutex);
+#ifdef _WIN32
+	if (mDummySock != INVALID_SOCKET)
+		::closesocket(mDummySock);
+#else
+	::close(mPipeIn);
+	::close(mPipeOut);
+#endif
+}
+
+int SelectInterrupter::prepare(fd_set &readfds, fd_set &writefds) {
+	std::lock_guard lock(mMutex);
+#ifdef _WIN32
+	if (mDummySock == INVALID_SOCKET)
+		mDummySock = ::socket(AF_INET, SOCK_DGRAM, 0);
+	FD_SET(mDummySock, &readfds);
+	return SOCK_TO_INT(mDummySock) + 1;
+#else
+	int ret;
+	do {
+		char dummy;
+		ret = ::read(mPipeIn, &dummy, 1);
+	} while (ret > 0);
+	FD_SET(mPipeIn, &readfds);
+	return mPipeIn + 1;
+#endif
+}
+
+void SelectInterrupter::interrupt() {
+	std::lock_guard lock(mMutex);
+#ifdef _WIN32
+	if (mDummySock != INVALID_SOCKET) {
+		::closesocket(mDummySock);
+		mDummySock = INVALID_SOCKET;
+	}
+#else
+	char dummy = 0;
+	::write(mPipeOut, &dummy, 1);
+#endif
+}
+
+TcpTransport::TcpTransport(const string &hostname, const string &service, state_callback callback)
+    : Transport(nullptr, std::move(callback)), mHostname(hostname), mService(service) {
+
+	PLOG_DEBUG << "Initializing TCP transport";
+	mThread = std::thread(&TcpTransport::runLoop, this);
+}
+
+TcpTransport::~TcpTransport() {
+	stop();
+}
+
+bool TcpTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Waiting for TCP recv thread";
+	close();
+	mThread.join();
+	return true;
+}
+
+bool TcpTransport::send(message_ptr message) {
+	if (state() != State::Connected)
+		return false;
+
+	if (!message)
+		return mSendQueue.empty();
+
+	PLOG_VERBOSE << "Send size=" << (message ? message->size() : 0);
+	return outgoing(message);
+}
+
+void TcpTransport::incoming(message_ptr message) {
+	if (!message)
+		return;
+
+	PLOG_VERBOSE << "Incoming size=" << message->size();
+	recv(message);
+}
+
+bool TcpTransport::outgoing(message_ptr message) {
+	// If nothing is pending, try to send directly
+	// It's safe because if the queue is empty, the thread is not sending
+	if (mSendQueue.empty() && trySendMessage(message))
+		return true;
+
+	mSendQueue.push(message);
+	interruptSelect(); // so the thread waits for writability
+	return false;
+}
+
+void TcpTransport::connect(const string &hostname, const string &service) {
+	PLOG_DEBUG << "Connecting to " << hostname << ":" << service;
+
+	struct addrinfo hints = {};
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+	hints.ai_protocol = IPPROTO_TCP;
+	hints.ai_flags = AI_ADDRCONFIG;
+
+	struct addrinfo *result = nullptr;
+	if (getaddrinfo(hostname.c_str(), service.c_str(), &hints, &result))
+		throw std::runtime_error("Resolution failed for \"" + hostname + ":" + service + "\"");
+
+	for (auto p = result; p; p = p->ai_next) {
+		try {
+			connect(p->ai_addr, p->ai_addrlen);
+
+			PLOG_INFO << "Connected to " << hostname << ":" << service;
+			freeaddrinfo(result);
+			return;
+
+		} catch (const std::runtime_error &e) {
+			if (p->ai_next) {
+				PLOG_DEBUG << e.what();
+			} else {
+				PLOG_WARNING << e.what();
+			}
+		}
+	}
+
+	freeaddrinfo(result);
+
+	std::ostringstream msg;
+	msg << "Connection to " << hostname << ":" << service << " failed";
+	throw std::runtime_error(msg.str());
+}
+
+void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
+	try {
+		char node[MAX_NUMERICNODE_LEN];
+		char serv[MAX_NUMERICSERV_LEN];
+		if (getnameinfo(addr, addrlen, node, MAX_NUMERICNODE_LEN, serv, MAX_NUMERICSERV_LEN,
+		                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
+			PLOG_DEBUG << "Trying address " << node << ":" << serv;
+		}
+
+		PLOG_VERBOSE << "Creating TCP socket";
+
+		// Create socket
+		mSock = ::socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
+		if (mSock == INVALID_SOCKET)
+			throw std::runtime_error("TCP socket creation failed");
+
+		ctl_t b = 1;
+		if (::ioctlsocket(mSock, FIONBIO, &b) < 0)
+			throw std::runtime_error("Failed to set socket non-blocking mode");
+
+#ifdef __APPLE__
+		// MacOS lacks MSG_NOSIGNAL and requires SO_NOSIGPIPE instead
+		int opt = 1;
+		if (::setsockopt(mSock, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof(opt)) < 0)
+			throw std::runtime_error("Failed to disable SIGPIPE for socket");
+#endif
+
+		// Initiate connection
+		int ret = ::connect(mSock, addr, addrlen);
+		if (ret < 0 && errno != EINPROGRESS) {
+			std::ostringstream msg;
+			msg << "TCP connection to " << node << ":" << serv << " failed, errno=" << sockerrno;
+			throw std::runtime_error(msg.str());
+		}
+
+		fd_set writefds;
+		FD_ZERO(&writefds);
+		FD_SET(mSock, &writefds);
+		struct timeval tv;
+		tv.tv_sec = 10; // TODO
+		tv.tv_usec = 0;
+		ret = ::select(SOCKET_TO_INT(mSock) + 1, NULL, &writefds, NULL, &tv);
+
+		if (ret < 0)
+			throw std::runtime_error("Failed to wait for socket connection");
+
+		if (ret == 0) {
+			std::ostringstream msg;
+			msg << "TCP connection to " << node << ":" << serv << " timed out";
+			throw std::runtime_error(msg.str());
+		}
+
+		int error = 0;
+		socklen_t errorlen = sizeof(error);
+		if (::getsockopt(mSock, SOL_SOCKET, SO_ERROR, &error, &errorlen) != 0)
+			throw std::runtime_error("Failed to get socket error code");
+
+		if (error != 0) {
+			std::ostringstream msg;
+			msg << "TCP connection to " << node << ":" << serv << " failed, errno=" << error;
+			throw std::runtime_error(msg.str());
+		}
+
+		PLOG_DEBUG << "TCP connection to " << node << ":" << serv << " succeeded";
+
+	} catch (...) {
+		if (mSock != INVALID_SOCKET) {
+			::closesocket(mSock);
+			mSock = INVALID_SOCKET;
+		}
+		throw;
+	}
+}
+
+void TcpTransport::close() {
+	if (mSock != INVALID_SOCKET) {
+		PLOG_DEBUG << "Closing TCP socket";
+		::closesocket(mSock);
+		mSock = INVALID_SOCKET;
+	}
+	changeState(State::Disconnected);
+}
+
+bool TcpTransport::trySendQueue() {
+	while (auto next = mSendQueue.peek()) {
+		auto message = *next;
+		if (!trySendMessage(message)) {
+			mSendQueue.exchange(message);
+			return false;
+		}
+		mSendQueue.pop();
+	}
+	return true;
+}
+
+bool TcpTransport::trySendMessage(message_ptr &message) {
+	auto data = reinterpret_cast<const char *>(message->data());
+	auto size = message->size();
+	while (size) {
+#ifdef __APPLE__
+		int flags = 0;
+#else
+		int flags = MSG_NOSIGNAL;
+#endif
+		int len = ::send(mSock, data, size, flags);
+		if (len < 0) {
+			if (errno == EAGAIN || errno == EWOULDBLOCK) {
+				message = make_message(message->end() - size, message->end());
+				return false;
+			} else {
+				throw std::runtime_error("Connection lost, errno=" + to_string(sockerrno));
+			}
+		}
+
+		data += len;
+		size -= len;
+	}
+	message = nullptr;
+	return true;
+}
+
+void TcpTransport::runLoop() {
+	const size_t bufferSize = 4096;
+
+	// Connect
+	try {
+		changeState(State::Connecting);
+		connect(mHostname, mService);
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TCP connect: " << e.what();
+		changeState(State::Failed);
+		return;
+	}
+
+	// Receive loop
+	try {
+		PLOG_INFO << "TCP connected";
+		changeState(State::Connected);
+
+		while (true) {
+			fd_set readfds, writefds;
+			int n = prepareSelect(readfds, writefds);
+
+			struct timeval tv;
+			tv.tv_sec = 10;
+			tv.tv_usec = 0;
+			int ret = ::select(n, &readfds, &writefds, NULL, &tv);
+			if (ret < 0) {
+				throw std::runtime_error("Failed to wait on socket");
+			} else if (ret == 0) {
+				PLOG_VERBOSE << "TCP is idle";
+				incoming(make_message(0));
+				continue;
+			}
+
+			if (FD_ISSET(mSock, &writefds))
+				trySendQueue();
+
+			if (FD_ISSET(mSock, &readfds)) {
+				char buffer[bufferSize];
+				int len = ::recv(mSock, buffer, bufferSize, 0);
+				if (len < 0) {
+					if (errno == EAGAIN || errno == EWOULDBLOCK) {
+						continue;
+					} else {
+						throw std::runtime_error("Connection lost");
+					}
+				}
+
+				if (len == 0)
+					break; // clean close
+
+				auto *b = reinterpret_cast<byte *>(buffer);
+				incoming(make_message(b, b + len));
+			}
+		}
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TCP recv: " << e.what();
+	}
+
+	PLOG_INFO << "TCP disconnected";
+	changeState(State::Disconnected);
+	recv(nullptr);
+}
+
+int TcpTransport::prepareSelect(fd_set &readfds, fd_set &writefds) {
+	FD_ZERO(&readfds);
+	FD_ZERO(&writefds);
+	FD_SET(mSock, &readfds);
+
+	if (!mSendQueue.empty())
+		FD_SET(mSock, &writefds);
+
+	int n = SOCKET_TO_INT(mSock) + 1;
+	int m = mInterrupter.prepare(readfds, writefds);
+	return std::max(n, m);
+}
+
+void TcpTransport::interruptSelect() { mInterrupter.interrupt(); }
+
+} // namespace rtc
+
+#endif

src/tcptransport.hpp

@@ -0,0 +1,90 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_TCP_TRANSPORT_H
+#define RTC_TCP_TRANSPORT_H
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "include.hpp"
+#include "queue.hpp"
+#include "transport.hpp"
+
+#include <mutex>
+#include <thread>
+
+// Use the socket defines from libjuice
+#include "../deps/libjuice/src/socket.h"
+
+namespace rtc {
+
+// Utility class to interrupt select()
+class SelectInterrupter {
+public:
+	SelectInterrupter();
+	~SelectInterrupter();
+
+	int prepare(fd_set &readfds, fd_set &writefds);
+	void interrupt();
+
+private:
+	std::mutex mMutex;
+#ifdef _WIN32
+	socket_t mDummySock = INVALID_SOCKET;
+#else // assume POSIX
+	int mPipeIn, mPipeOut;
+#endif
+};
+
+class TcpTransport : public Transport {
+public:
+	TcpTransport(const string &hostname, const string &service, state_callback callback);
+	~TcpTransport();
+
+	bool stop() override;
+	bool send(message_ptr message) override;
+
+	void incoming(message_ptr message) override;
+	bool outgoing(message_ptr message) override;
+
+private:
+	void connect(const string &hostname, const string &service);
+	void connect(const sockaddr *addr, socklen_t addrlen);
+	void close();
+
+	bool trySendQueue();
+	bool trySendMessage(message_ptr &message);
+
+	void runLoop();
+
+	int prepareSelect(fd_set &readfds, fd_set &writefds);
+	void interruptSelect();
+
+	string mHostname, mService;
+
+	socket_t mSock = INVALID_SOCKET;
+	std::thread mThread;
+	SelectInterrupter mInterrupter;
+	Queue<message_ptr> mSendQueue;
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/tlstransport.cpp

@@ -0,0 +1,490 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "tlstransport.hpp"
+#include "tcptransport.hpp"
+
+#include <chrono>
+#include <cstring>
+#include <exception>
+#include <iostream>
+
+using namespace std::chrono;
+
+using std::shared_ptr;
+using std::string;
+using std::unique_ptr;
+using std::weak_ptr;
+
+#if USE_GNUTLS
+
+namespace {
+
+static bool check_gnutls(int ret, const string &message = "GnuTLS error") {
+	if (ret < 0) {
+		if (!gnutls_error_is_fatal(ret)) {
+			PLOG_INFO << gnutls_strerror(ret);
+			return false;
+		}
+		PLOG_ERROR << message << ": " << gnutls_strerror(ret);
+		throw std::runtime_error(message + ": " + gnutls_strerror(ret));
+	}
+	return true;
+}
+
+} // namespace
+
+namespace rtc {
+
+void TlsTransport::Init() {
+	// Nothing to do
+}
+
+void TlsTransport::Cleanup() {
+	// Nothing to do
+}
+
+TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_callback callback)
+    : Transport(lower, std::move(callback)), mHost(std::move(host)) {
+
+	PLOG_DEBUG << "Initializing TLS transport (GnuTLS)";
+
+	check_gnutls(gnutls_certificate_allocate_credentials(&mCreds));
+	check_gnutls(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;
+		check_gnutls(gnutls_priority_set_direct(mSession, priorities, &err_pos),
+		             "Failed to set TLS priorities");
+
+       	PLOG_VERBOSE << "Server Name Indication: " << mHost;
+		gnutls_server_name_set(mSession, GNUTLS_NAME_DNS, mHost.data(), mHost.size());
+
+ 		gnutls_session_set_ptr(mSession, this);
+		gnutls_transport_set_ptr(mSession, this);
+		gnutls_transport_set_push_function(mSession, WriteCallback);
+		gnutls_transport_set_pull_function(mSession, ReadCallback);
+		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
+
+       	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+		registerIncoming();
+
+	} catch (...) {
+		gnutls_deinit(mSession);
+		gnutls_certificate_free_credentials(mCreds);
+		throw;
+	}
+}
+
+TlsTransport::~TlsTransport() {
+	stop();
+	gnutls_deinit(mSession);
+	gnutls_certificate_free_credentials(mCreds);
+}
+
+bool TlsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Stopping TLS recv thread";
+	mIncomingQueue.stop();
+	mRecvThread.join();
+	return true;
+}
+
+bool TlsTransport::send(message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+
+	if(message->size() == 0)
+		return true;
+
+	ssize_t ret;
+	do {
+		ret = gnutls_record_send(mSession, message->data(), message->size());
+	} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+	return check_gnutls(ret);
+}
+
+void TlsTransport::incoming(message_ptr message) {
+	if (message)
+		mIncomingQueue.push(message);
+	else
+		mIncomingQueue.stop();
+}
+
+void TlsTransport::runRecvLoop() {
+	const size_t bufferSize = 4096;
+	char buffer[bufferSize];
+
+	// Handshake loop
+	try {
+		changeState(State::Connecting);
+
+		int ret;
+		do {
+			ret = gnutls_handshake(mSession);
+		} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN ||
+		         !check_gnutls(ret, "TLS handshake failed"));
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TLS handshake: " << e.what();
+		changeState(State::Failed);
+		return;
+	}
+
+	// Receive loop
+	try {
+		PLOG_INFO << "TLS handshake finished";
+		changeState(State::Connected);
+
+		while (true) {
+			ssize_t ret;
+			do {
+				ret = gnutls_record_recv(mSession, buffer, bufferSize);
+			} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+			// Consider premature termination as remote closing
+			if (ret == GNUTLS_E_PREMATURE_TERMINATION) {
+				PLOG_DEBUG << "TLS connection terminated";
+				break;
+			}
+
+			if (check_gnutls(ret)) {
+				if (ret == 0) {
+					// Closed
+					PLOG_DEBUG << "TLS connection cleanly closed";
+					break;
+				}
+				auto *b = reinterpret_cast<byte *>(buffer);
+				recv(make_message(b, b + ret));
+			}
+		}
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TLS recv: " << e.what();
+	}
+
+	gnutls_bye(mSession, GNUTLS_SHUT_RDWR);
+
+	PLOG_INFO << "TLS closed";
+	changeState(State::Disconnected);
+	recv(nullptr);
+}
+
+ssize_t TlsTransport::WriteCallback(gnutls_transport_ptr_t ptr, const void *data, size_t len) {
+	TlsTransport *t = static_cast<TlsTransport *>(ptr);
+	if (len > 0) {
+		auto b = reinterpret_cast<const byte *>(data);
+		t->outgoing(make_message(b, b + len));
+	}
+	gnutls_transport_set_errno(t->mSession, 0);
+	return ssize_t(len);
+}
+
+ssize_t TlsTransport::ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen) {
+	TlsTransport *t = static_cast<TlsTransport *>(ptr);
+
+	message_ptr &message = t->mIncomingMessage;
+	size_t &position = t->mIncomingMessagePosition;
+
+	if(message && position >= message->size())
+		message.reset();
+
+	if(!message) {
+		position = 0;
+		while (auto next = t->mIncomingQueue.pop()) {
+			message = *next;
+			if (message->size() > 0)
+				break;
+			else
+				t->recv(message); // Pass zero-sized messages through
+		}
+	}
+
+	if(message) {
+		size_t available = message->size() - position;
+		ssize_t len = std::min(maxlen, available);
+		std::memcpy(data, message->data() + position, len);
+		position+= len;
+		gnutls_transport_set_errno(t->mSession, 0);
+		return len;
+	}
+	else {
+		// Closed
+		gnutls_transport_set_errno(t->mSession, 0);
+		return 0;
+	}
+}
+
+int TlsTransport::TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms) {
+	TlsTransport *t = static_cast<TlsTransport *>(ptr);
+	if (ms != GNUTLS_INDEFINITE_TIMEOUT)
+		t->mIncomingQueue.wait(milliseconds(ms));
+	else
+		t->mIncomingQueue.wait();
+	return !t->mIncomingQueue.empty() ? 1 : 0;
+}
+
+} // namespace rtc
+
+#else // USE_GNUTLS==0
+
+#include <openssl/bio.h>
+#include <openssl/ec.h>
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+
+namespace {
+
+const int BIO_EOF = -1;
+
+string openssl_error_string(unsigned long err) {
+	const size_t bufferSize = 256;
+	char buffer[bufferSize];
+	ERR_error_string_n(err, buffer, bufferSize);
+	return string(buffer);
+}
+
+bool check_openssl(int success, const string &message = "OpenSSL error") {
+	if (success)
+		return true;
+
+	string str = openssl_error_string(ERR_get_error());
+	PLOG_ERROR << message << ": " << str;
+	throw std::runtime_error(message + ": " + str);
+}
+
+bool check_openssl_ret(SSL *ssl, int ret, const string &message = "OpenSSL error") {
+	if (ret == BIO_EOF)
+		return true;
+
+	unsigned long err = SSL_get_error(ssl, ret);
+	if (err == SSL_ERROR_NONE || err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) {
+		return true;
+	}
+	if (err == SSL_ERROR_ZERO_RETURN) {
+		PLOG_DEBUG << "TLS connection cleanly closed";
+		return false;
+	}
+	string str = openssl_error_string(err);
+	PLOG_ERROR << str;
+	throw std::runtime_error(message + ": " + str);
+}
+
+} // namespace
+
+namespace rtc {
+
+int TlsTransport::TransportExIndex = -1;
+
+void TlsTransport::Init() {
+	if (TransportExIndex < 0) {
+		TransportExIndex = SSL_get_ex_new_index(0, NULL, NULL, NULL, NULL);
+	}
+}
+
+void TlsTransport::Cleanup() {
+	// Nothing to do
+}
+
+TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_callback callback)
+    : Transport(lower, std::move(callback)), mHost(std::move(host)) {
+
+	PLOG_DEBUG << "Initializing TLS transport (OpenSSL)";
+
+	try {
+		if (!(mCtx = SSL_CTX_new(SSLv23_method()))) // version-flexible
+			throw std::runtime_error("Failed to create SSL context");
+
+		check_openssl(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
+		              "Failed to set SSL priorities");
+
+		SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3);
+		SSL_CTX_set_min_proto_version(mCtx, TLS1_VERSION);
+		SSL_CTX_set_read_ahead(mCtx, 1);
+		SSL_CTX_set_quiet_shutdown(mCtx, 1);
+		SSL_CTX_set_info_callback(mCtx, InfoCallback);
+
+		SSL_CTX_set_default_verify_paths(mCtx);
+		SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER, NULL);
+		SSL_CTX_set_verify_depth(mCtx, 4);
+
+		if (!(mSsl = SSL_new(mCtx)))
+			throw std::runtime_error("Failed to create SSL instance");
+
+		SSL_set_ex_data(mSsl, TransportExIndex, this);
+
+		SSL_set_hostflags(mSsl, 0);
+		check_openssl(SSL_set1_host(mSsl, mHost.c_str()), "Failed to set SSL host");
+
+		PLOG_VERBOSE << "Server Name Indication: " << mHost;
+		SSL_set_tlsext_host_name(mSsl, mHost.c_str());
+
+		SSL_set_connect_state(mSsl);
+
+		if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BIO_s_mem())))
+			throw std::runtime_error("Failed to create BIO");
+
+		BIO_set_mem_eof_return(mInBio, BIO_EOF);
+		BIO_set_mem_eof_return(mOutBio, BIO_EOF);
+		SSL_set_bio(mSsl, mInBio, mOutBio);
+
+		auto ecdh = unique_ptr<EC_KEY, decltype(&EC_KEY_free)>(
+		    EC_KEY_new_by_curve_name(NID_X9_62_prime256v1), EC_KEY_free);
+		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
+		SSL_set_tmp_ecdh(mSsl, ecdh.get());
+
+		mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+		registerIncoming();
+
+	} catch (...) {
+		if (mSsl)
+			SSL_free(mSsl);
+		if (mCtx)
+			SSL_CTX_free(mCtx);
+		throw;
+	}
+}
+
+TlsTransport::~TlsTransport() {
+	stop();
+
+	SSL_free(mSsl);
+	SSL_CTX_free(mCtx);
+}
+
+bool TlsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	PLOG_DEBUG << "Stopping TLS recv thread";
+	mIncomingQueue.stop();
+	mRecvThread.join();
+	SSL_shutdown(mSsl);
+	return true;
+}
+
+bool TlsTransport::send(message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+
+	if (message->size() == 0)
+		return true;
+
+	int ret = SSL_write(mSsl, message->data(), message->size());
+	if (!check_openssl_ret(mSsl, ret))
+		return false;
+
+	const size_t bufferSize = 4096;
+	byte buffer[bufferSize];
+	while ((ret = BIO_read(mOutBio, buffer, bufferSize)) > 0)
+		outgoing(make_message(buffer, buffer + ret));
+
+	return true;
+}
+
+void TlsTransport::incoming(message_ptr message) {
+	if (message)
+		mIncomingQueue.push(message);
+	else
+		mIncomingQueue.stop();
+}
+
+void TlsTransport::runRecvLoop() {
+	const size_t bufferSize = 4096;
+	byte buffer[bufferSize];
+
+	try {
+		changeState(State::Connecting);
+
+		while (true) {
+			if (state() == State::Connecting) {
+				// Initiate or continue the handshake
+				int ret = SSL_do_handshake(mSsl);
+				if (!check_openssl_ret(mSsl, ret, "Handshake failed"))
+					break;
+
+				// Output
+				while ((ret = BIO_read(mOutBio, buffer, bufferSize)) > 0)
+					outgoing(make_message(buffer, buffer + ret));
+
+				if (SSL_is_init_finished(mSsl)) {
+					PLOG_INFO << "TLS handshake finished";
+					changeState(State::Connected);
+				}
+			} else {
+				int ret = SSL_read(mSsl, buffer, bufferSize);
+				if (!check_openssl_ret(mSsl, ret))
+					break;
+
+				if (ret > 0)
+					recv(make_message(buffer, buffer + ret));
+			}
+
+			auto next = mIncomingQueue.pop();
+			if (!next)
+				break;
+
+			message_ptr message = *next;
+			if (message->size() > 0)
+				BIO_write(mInBio, message->data(), message->size()); // Input
+			else
+				recv(message); // Pass zero-sized messages through
+		}
+
+	} catch (const std::exception &e) {
+		PLOG_ERROR << "TLS recv: " << e.what();
+	}
+
+	if (state() == State::Connected) {
+		PLOG_INFO << "TLS closed";
+		recv(nullptr);
+	} else {
+		PLOG_ERROR << "TLS handshake failed";
+	}
+}
+
+void TlsTransport::InfoCallback(const SSL *ssl, int where, int ret) {
+	TlsTransport *t =
+	    static_cast<TlsTransport *>(SSL_get_ex_data(ssl, TlsTransport::TransportExIndex));
+
+	if (where & SSL_CB_ALERT) {
+		if (ret != 256) { // Close Notify
+			PLOG_ERROR << "TLS alert: " << SSL_alert_desc_string_long(ret);
+		}
+		t->mIncomingQueue.stop(); // Close the connection
+	}
+}
+
+} // namespace rtc
+
+#endif
+
+#endif

src/tlstransport.hpp

@@ -0,0 +1,89 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_TLS_TRANSPORT_H
+#define RTC_TLS_TRANSPORT_H
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "include.hpp"
+#include "queue.hpp"
+#include "transport.hpp"
+
+#include <memory>
+#include <mutex>
+#include <thread>
+
+#if USE_GNUTLS
+#include <gnutls/gnutls.h>
+#else
+#include <openssl/ssl.h>
+#endif
+
+namespace rtc {
+
+class TcpTransport;
+
+class TlsTransport : public Transport {
+public:
+	static void Init();
+	static void Cleanup();
+
+	TlsTransport(std::shared_ptr<TcpTransport> lower, string host, state_callback callback);
+	~TlsTransport();
+
+	bool stop() override;
+	bool send(message_ptr message) override;
+
+	void incoming(message_ptr message) override;
+
+protected:
+	void runRecvLoop();
+
+	string mHost;
+
+	Queue<message_ptr> mIncomingQueue;
+	std::thread mRecvThread;
+
+#if USE_GNUTLS
+	gnutls_session_t mSession;
+	gnutls_certificate_credentials_t mCreds;
+
+	message_ptr mIncomingMessage;
+	size_t mIncomingMessagePosition = 0;
+
+	static ssize_t WriteCallback(gnutls_transport_ptr_t ptr, const void *data, size_t len);
+	static ssize_t ReadCallback(gnutls_transport_ptr_t ptr, void *data, size_t maxlen);
+	static int TimeoutCallback(gnutls_transport_ptr_t ptr, unsigned int ms);
+#else
+	SSL_CTX *mCtx;
+	SSL *mSsl;
+	BIO *mInBio, *mOutBio;
+
+	static int TransportExIndex;
+
+	static int CertificateCallback(int preverify_ok, X509_STORE_CTX *ctx);
+	static void InfoCallback(const SSL *ssl, int where, int ret);
+#endif
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/transport.hpp

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

src/websocket.cpp

@@ -0,0 +1,323 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "include.hpp"
+#include "websocket.hpp"
+
+#include "tcptransport.hpp"
+#include "tlstransport.hpp"
+#include "wstransport.hpp"
+
+#include <regex>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#endif
+
+namespace rtc {
+
+WebSocket::WebSocket() { PLOG_VERBOSE << "Creating WebSocket"; }
+
+WebSocket::~WebSocket() {
+	PLOG_VERBOSE << "Destroying WebSocket";
+	remoteClose();
+}
+
+WebSocket::State WebSocket::readyState() const { return mState; }
+
+void WebSocket::open(const string &url) {
+	if (mState != State::Closed)
+		throw std::runtime_error("WebSocket must be closed before opening");
+
+	static const char *rs = R"(^(([^:\/?#]+):)?(//([^\/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?)";
+	static std::regex regex(rs, std::regex::extended);
+
+	std::smatch match;
+	if (!std::regex_match(url, match, regex))
+		throw std::invalid_argument("Malformed WebSocket URL: " + url);
+
+	mScheme = match[2];
+	if (mScheme != "ws" && mScheme != "wss")
+		throw std::invalid_argument("Invalid WebSocket scheme: " + mScheme);
+
+	mHost = match[4];
+	if (auto pos = mHost.find(':'); pos != string::npos) {
+		mHostname = mHost.substr(0, pos);
+		mService = mHost.substr(pos + 1);
+	} else {
+		mHostname = mHost;
+		mService = mScheme == "ws" ? "80" : "443";
+	}
+
+	mPath = match[5];
+	if (string query = match[7]; !query.empty())
+		mPath += "?" + query;
+
+	changeState(State::Connecting);
+	initTcpTransport();
+}
+
+void WebSocket::close() {
+	auto state = mState.load();
+	if (state == State::Connecting || state == State::Open) {
+		PLOG_VERBOSE << "Closing WebSocket";
+		changeState(State::Closing);
+		if (auto transport = std::atomic_load(&mWsTransport))
+			transport->close();
+		else
+			changeState(State::Closed);
+	}
+}
+
+void WebSocket::remoteClose() {
+	if (mState.load() != State::Closed) {
+		close();
+		closeTransports();
+	}
+}
+
+bool WebSocket::send(const std::variant<binary, string> &data) {
+	return std::visit(
+	    [&](const auto &d) {
+		    using T = std::decay_t<decltype(d)>;
+		    constexpr auto type = std::is_same_v<T, string> ? Message::String : Message::Binary;
+		    auto *b = reinterpret_cast<const byte *>(d.data());
+		    return outgoing(std::make_shared<Message>(b, b + d.size(), type));
+	    },
+	    data);
+}
+
+bool WebSocket::isOpen() const { return mState == State::Open; }
+
+bool WebSocket::isClosed() const { return mState == State::Closed; }
+
+size_t WebSocket::maxMessageSize() const { return DEFAULT_MAX_MESSAGE_SIZE; }
+
+std::optional<std::variant<binary, string>> WebSocket::receive() {
+	while (!mRecvQueue.empty()) {
+		auto message = *mRecvQueue.pop();
+		switch (message->type) {
+		case Message::String:
+			return std::make_optional(
+			    string(reinterpret_cast<const char *>(message->data()), message->size()));
+		case Message::Binary:
+			return std::make_optional(std::move(*message));
+		default:
+			// Ignore
+			break;
+		}
+	}
+	return nullopt;
+}
+
+size_t WebSocket::availableAmount() const { return mRecvQueue.amount(); }
+
+bool WebSocket::changeState(State state) { return mState.exchange(state) != state; }
+
+bool WebSocket::outgoing(mutable_message_ptr message) {
+	if (mState != State::Open || !mWsTransport)
+		throw std::runtime_error("WebSocket is not open");
+
+	if (message->size() > maxMessageSize())
+		throw std::runtime_error("Message size exceeds limit");
+
+	return mWsTransport->send(message);
+}
+
+void WebSocket::incoming(message_ptr message) {
+	if (message->type == Message::String || message->type == Message::Binary) {
+		mRecvQueue.push(message);
+		triggerAvailable(mRecvQueue.size());
+	}
+}
+
+std::shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
+	using State = TcpTransport::State;
+	try {
+		std::lock_guard lock(mInitMutex);
+		if (auto transport = std::atomic_load(&mTcpTransport))
+			return transport;
+
+		auto transport = std::make_shared<TcpTransport>(
+		    mHostname, mService, [this, weak_this = weak_from_this()](State state) {
+			    auto shared_this = weak_this.lock();
+			    if (!shared_this)
+				    return;
+			    switch (state) {
+			    case State::Connected:
+				    if (mScheme == "ws")
+					    initWsTransport();
+				    else
+					    initTlsTransport();
+				    break;
+			    case State::Failed:
+				    triggerError("TCP connection failed");
+				    remoteClose();
+				    break;
+			    case State::Disconnected:
+				    remoteClose();
+				    break;
+			    default:
+				    // Ignore
+				    break;
+			    }
+		    });
+		std::atomic_store(&mTcpTransport, transport);
+		if (mState == WebSocket::State::Closed) {
+			mTcpTransport.reset();
+			transport->stop();
+			throw std::runtime_error("Connection is closed");
+		}
+		return transport;
+	} catch (const std::exception &e) {
+		PLOG_ERROR << e.what();
+		remoteClose();
+		throw std::runtime_error("TCP transport initialization failed");
+	}
+}
+
+std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
+	using State = TlsTransport::State;
+	try {
+		std::lock_guard lock(mInitMutex);
+		if (auto transport = std::atomic_load(&mTlsTransport))
+			return transport;
+
+		auto lower = std::atomic_load(&mTcpTransport);
+		auto transport = std::make_shared<TlsTransport>(
+		    lower, mHost, [this, weak_this = weak_from_this()](State state) {
+			    auto shared_this = weak_this.lock();
+			    if (!shared_this)
+				    return;
+			    switch (state) {
+			    case State::Connected:
+				    initWsTransport();
+				    break;
+			    case State::Failed:
+				    triggerError("TCP connection failed");
+				    remoteClose();
+				    break;
+			    case State::Disconnected:
+				    remoteClose();
+				    break;
+			    default:
+				    // Ignore
+				    break;
+			    }
+		    });
+		std::atomic_store(&mTlsTransport, transport);
+		if (mState == WebSocket::State::Closed) {
+			mTlsTransport.reset();
+			transport->stop();
+			throw std::runtime_error("Connection is closed");
+		}
+		return transport;
+	} catch (const std::exception &e) {
+		PLOG_ERROR << e.what();
+		remoteClose();
+		throw std::runtime_error("TLS transport initialization failed");
+	}
+}
+
+std::shared_ptr<WsTransport> WebSocket::initWsTransport() {
+	using State = WsTransport::State;
+	try {
+		std::lock_guard lock(mInitMutex);
+		if (auto transport = std::atomic_load(&mWsTransport))
+			return transport;
+
+		std::shared_ptr<Transport> lower = std::atomic_load(&mTlsTransport);
+		if (!lower)
+			lower = std::atomic_load(&mTcpTransport);
+		auto transport = std::make_shared<WsTransport>(
+		    lower, mHost, mPath, weak_bind(&WebSocket::incoming, this, _1),
+		    [this, weak_this = weak_from_this()](State state) {
+			    auto shared_this = weak_this.lock();
+			    if (!shared_this)
+				    return;
+			    switch (state) {
+			    case State::Connected:
+				    if (mState == WebSocket::State::Connecting) {
+					    PLOG_DEBUG << "WebSocket open";
+					    changeState(WebSocket::State::Open);
+					    triggerOpen();
+				    }
+				    break;
+			    case State::Failed:
+				    triggerError("WebSocket connection failed");
+				    remoteClose();
+				    break;
+			    case State::Disconnected:
+				    remoteClose();
+				    break;
+			    default:
+				    // Ignore
+				    break;
+			    }
+		    });
+		std::atomic_store(&mWsTransport, transport);
+		if (mState == WebSocket::State::Closed) {
+			mWsTransport.reset();
+			transport->stop();
+			throw std::runtime_error("Connection is closed");
+		}
+		return transport;
+	} catch (const std::exception &e) {
+		PLOG_ERROR << e.what();
+		remoteClose();
+		throw std::runtime_error("WebSocket transport initialization failed");
+	}
+}
+
+void WebSocket::closeTransports() {
+	PLOG_VERBOSE << "Closing transports";
+
+	if (mState.load() != State::Closed) {
+		changeState(State::Closed);
+		triggerClosed();
+	}
+
+	// Reset callbacks now that state is changed
+	resetCallbacks();
+
+	// Pass the references to a thread, allowing to terminate a transport from its own thread
+	auto ws = std::atomic_exchange(&mWsTransport, decltype(mWsTransport)(nullptr));
+	auto tls = std::atomic_exchange(&mTlsTransport, decltype(mTlsTransport)(nullptr));
+	auto tcp = std::atomic_exchange(&mTcpTransport, decltype(mTcpTransport)(nullptr));
+	if (ws || tls || tcp) {
+		std::thread t([ws, tls, tcp]() mutable {
+			if (ws)
+				ws->stop();
+			if (tls)
+				tls->stop();
+			if (tcp)
+				tcp->stop();
+
+			ws.reset();
+			tls.reset();
+			tcp.reset();
+		});
+		t.detach();
+	}
+}
+
+} // namespace rtc
+
+#endif

src/wstransport.cpp

@@ -0,0 +1,409 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "wstransport.hpp"
+#include "tcptransport.hpp"
+#include "tlstransport.hpp"
+
+#include "base64.hpp"
+
+#include <chrono>
+#include <list>
+#include <map>
+#include <random>
+#include <regex>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+#ifndef htonll
+#define htonll(x)                                                                                  \
+	((uint64_t)htonl(((uint64_t)(x)&0xFFFFFFFF) << 32) | (uint64_t)htonl((uint64_t)(x) >> 32))
+#endif
+#ifndef ntohll
+#define ntohll(x) htonll(x)
+#endif
+
+namespace rtc {
+
+using namespace std::chrono;
+using std::to_integer;
+using std::to_string;
+
+using random_bytes_engine =
+    std::independent_bits_engine<std::default_random_engine, CHAR_BIT, unsigned char>;
+
+WsTransport::WsTransport(std::shared_ptr<Transport> lower, string host, string path,
+                         message_callback recvCallback, state_callback stateCallback)
+    : Transport(lower, std::move(stateCallback)), mHost(std::move(host)), mPath(std::move(path)) {
+	onRecv(recvCallback);
+
+	PLOG_DEBUG << "Initializing WebSocket transport";
+
+	registerIncoming();
+	sendHttpRequest();
+}
+
+WsTransport::~WsTransport() { stop(); }
+
+bool WsTransport::stop() {
+	if (!Transport::stop())
+		return false;
+
+	close();
+	return true;
+}
+
+bool WsTransport::send(message_ptr message) {
+	if (!message)
+		return false;
+
+	// Call the mutable message overload with a copy
+	return send(std::make_shared<Message>(*message));
+}
+
+bool WsTransport::send(mutable_message_ptr message) {
+	if (!message || state() != State::Connected)
+		return false;
+
+	PLOG_VERBOSE << "Send size=" << message->size();
+	return sendFrame({message->type == Message::String ? TEXT_FRAME : BINARY_FRAME, message->data(),
+	                  message->size(), true, true});
+}
+
+void WsTransport::incoming(message_ptr message) {
+	auto s = state();
+	if (s != State::Connecting && s != State::Connected)
+		return; // Drop
+
+	if (message) {
+		PLOG_VERBOSE << "Incoming size=" << message->size();
+
+		if (message->size() == 0) {
+			// TCP is idle, send a ping
+			PLOG_DEBUG << "WebSocket sending ping";
+			uint32_t dummy = 0;
+			sendFrame({PING, reinterpret_cast<byte *>(&dummy), 4, true, true});
+			return;
+		}
+
+		mBuffer.insert(mBuffer.end(), message->begin(), message->end());
+
+		try {
+			if (state() == State::Connecting) {
+				if (size_t len = readHttpResponse(mBuffer.data(), mBuffer.size())) {
+					PLOG_INFO << "WebSocket open";
+					changeState(State::Connected);
+					mBuffer.erase(mBuffer.begin(), mBuffer.begin() + len);
+				}
+			}
+
+			if (state() == State::Connected) {
+				Frame frame;
+				while (size_t len = readFrame(mBuffer.data(), mBuffer.size(), frame)) {
+					recvFrame(frame);
+					mBuffer.erase(mBuffer.begin(), mBuffer.begin() + len);
+				}
+			}
+
+			return;
+
+		} catch (const std::exception &e) {
+			PLOG_ERROR << e.what();
+		}
+	}
+
+	if (state() == State::Connected) {
+		PLOG_INFO << "WebSocket disconnected";
+		changeState(State::Disconnected);
+		recv(nullptr);
+	} else {
+		PLOG_ERROR << "WebSocket handshake failed";
+		changeState(State::Failed);
+	}
+}
+
+void WsTransport::close() {
+	if (state() == State::Connected) {
+		sendFrame({CLOSE, NULL, 0, true, true});
+		PLOG_INFO << "WebSocket closing";
+		changeState(State::Disconnected);
+	}
+}
+
+bool WsTransport::sendHttpRequest() {
+	changeState(State::Connecting);
+
+	auto seed = system_clock::now().time_since_epoch().count();
+	random_bytes_engine generator(seed);
+
+	binary key(16);
+	auto k = reinterpret_cast<uint8_t *>(key.data());
+	std::generate(k, k + key.size(), generator);
+
+	const string request = "GET " + mPath +
+	                       " HTTP/1.1\r\n"
+	                       "Host: " +
+	                       mHost +
+	                       "\r\n"
+	                       "Connection: Upgrade\r\n"
+	                       "Upgrade: websocket\r\n"
+	                       "Sec-WebSocket-Version: 13\r\n"
+	                       "Sec-WebSocket-Key: " +
+	                       to_base64(key) +
+	                       "\r\n"
+	                       "\r\n";
+
+	auto data = reinterpret_cast<const byte *>(request.data());
+	auto size = request.size();
+	return outgoing(make_message(data, data + size));
+}
+
+size_t WsTransport::readHttpResponse(const byte *buffer, size_t size) {
+	std::list<string> lines;
+	auto begin = reinterpret_cast<const char *>(buffer);
+	auto end = begin + size;
+	auto cur = begin;
+
+	while (true) {
+		auto last = cur;
+		cur = std::find(cur, end, '\n');
+		if (cur == end)
+			return 0;
+		string line(last, cur != begin && *std::prev(cur) == '\r' ? std::prev(cur++) : cur++);
+		if (line.empty())
+			break;
+		lines.emplace_back(std::move(line));
+	}
+	size_t length = cur - begin;
+
+	if (lines.empty())
+		throw std::runtime_error("Invalid HTTP response for WebSocket");
+
+	string status = std::move(lines.front());
+	lines.pop_front();
+
+	std::istringstream ss(status);
+	string protocol;
+	unsigned int code = 0;
+	ss >> protocol >> code;
+	PLOG_DEBUG << "WebSocket response code: " << code;
+	if (code != 101)
+		throw std::runtime_error("Unexpected response code for WebSocket: " + to_string(code));
+
+	std::multimap<string, string> headers;
+	for (const auto &line : lines) {
+		if (size_t pos = line.find_first_of(':'); pos != string::npos) {
+			string key = line.substr(0, pos);
+			string value = line.substr(line.find_first_not_of(' ', pos + 1));
+			std::transform(key.begin(), key.end(), key.begin(),
+			               [](char c) { return std::tolower(c); });
+			headers.emplace(std::move(key), std::move(value));
+		} else {
+			headers.emplace(line, "");
+		}
+	}
+
+	auto h = headers.find("upgrade");
+	if (h == headers.end() || h->second != "websocket")
+		throw std::runtime_error("WebSocket update header missing or mismatching");
+
+	h = headers.find("sec-websocket-accept");
+	if (h == headers.end())
+		throw std::runtime_error("WebSocket accept header missing");
+
+	// TODO: Verify Sec-WebSocket-Accept
+
+	return length;
+}
+
+// http://tools.ietf.org/html/rfc6455#section-5.2  Base Framing Protocol
+//
+//  0                   1                   2                   3
+//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-------+-+-------------+-------------------------------+
+// |F|R|R|R| opcode|M| Payload len |    Extended payload length    |
+// |I|S|S|S|  (4)  |A|     (7)     |             (16/64)           |
+// |N|V|V|V|       |S|             |   (if payload len==126/127)   |
+// | |1|2|3|       |K|             |                               |
+// +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
+// |    Extended payload length continued, if payload len == 127   |
+// + - - - - - - - - - - - - - - - +-------------------------------+
+// |                               | Masking-key, if MASK set to 1 |
+// +-------------------------------+-------------------------------+
+// |    Masking-key (continued)    |          Payload Data         |
+// +-------------------------------+ - - - - - - - - - - - - - - - +
+// :                     Payload Data continued ...                :
+// + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
+// |                     Payload Data continued ...                |
+// +---------------------------------------------------------------+
+
+size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
+	const byte *end = buffer + size;
+	if (end - buffer < 2)
+		return 0;
+
+	byte *cur = buffer;
+	auto b1 = to_integer<uint8_t>(*cur++);
+	auto b2 = to_integer<uint8_t>(*cur++);
+
+	frame.fin = (b1 & 0x80) != 0;
+	frame.mask = (b2 & 0x80) != 0;
+	frame.opcode = static_cast<Opcode>(b1 & 0x0F);
+	frame.length = b2 & 0x7F;
+
+	if (frame.length == 0x7E) {
+		if (end - cur < 2)
+			return 0;
+		frame.length = ntohs(*reinterpret_cast<const uint16_t *>(cur));
+		cur += 2;
+	} else if (frame.length == 0x7F) {
+		if (end - cur < 8)
+			return 0;
+		frame.length = ntohll(*reinterpret_cast<const uint64_t *>(cur));
+		cur += 8;
+	}
+
+	const byte *maskingKey = nullptr;
+	if (frame.mask) {
+		if (end - cur < 4)
+			return 0;
+		maskingKey = cur;
+		cur += 4;
+	}
+
+	if (end - cur < frame.length)
+		return 0;
+
+	frame.payload = cur;
+	if (maskingKey)
+		for (size_t i = 0; i < frame.length; ++i)
+			frame.payload[i] ^= maskingKey[i % 4];
+	cur += frame.length;
+
+	return cur - buffer;
+}
+
+void WsTransport::recvFrame(const Frame &frame) {
+	PLOG_DEBUG << "WebSocket received frame: opcode=" << int(frame.opcode)
+	           << ", length=" << frame.length;
+
+	switch (frame.opcode) {
+	case TEXT_FRAME:
+	case BINARY_FRAME: {
+		if (!mPartial.empty()) {
+			PLOG_WARNING << "WebSocket unfinished message: type="
+			             << (mPartialOpcode == TEXT_FRAME ? "text" : "binary")
+			             << ", length=" << mPartial.size();
+			auto type = mPartialOpcode == TEXT_FRAME ? Message::String : Message::Binary;
+			recv(make_message(mPartial.begin(), mPartial.end(), type));
+			mPartial.clear();
+		}
+		mPartialOpcode = frame.opcode;
+		if (frame.fin) {
+			PLOG_DEBUG << "WebSocket finished message: type="
+			           << (frame.opcode == TEXT_FRAME ? "text" : "binary")
+			           << ", length=" << frame.length;
+			auto type = frame.opcode == TEXT_FRAME ? Message::String : Message::Binary;
+			recv(make_message(frame.payload, frame.payload + frame.length, type));
+		} else {
+			mPartial.insert(mPartial.end(), frame.payload, frame.payload + frame.length);
+		}
+		break;
+	}
+	case CONTINUATION: {
+		mPartial.insert(mPartial.end(), frame.payload, frame.payload + frame.length);
+		if (frame.fin) {
+			PLOG_DEBUG << "WebSocket finished message: type="
+			           << (frame.opcode == TEXT_FRAME ? "text" : "binary")
+			           << ", length=" << mPartial.size();
+			auto type = mPartialOpcode == TEXT_FRAME ? Message::String : Message::Binary;
+			recv(make_message(mPartial.begin(), mPartial.end(), type));
+			mPartial.clear();
+		}
+		break;
+	}
+	case PING: {
+		PLOG_DEBUG << "WebSocket received ping, sending pong";
+		sendFrame({PONG, frame.payload, frame.length, true, true});
+		break;
+	}
+	case PONG: {
+		PLOG_DEBUG << "WebSocket received pong";
+		break;
+	}
+	case CLOSE: {
+		close();
+		PLOG_INFO << "WebSocket closed";
+		changeState(State::Disconnected);
+		break;
+	}
+	default: {
+		close();
+		throw std::invalid_argument("Unknown WebSocket opcode: " + to_string(frame.opcode));
+	}
+	}
+}
+
+bool WsTransport::sendFrame(const Frame &frame) {
+	PLOG_DEBUG << "WebSocket sending frame: opcode=" << int(frame.opcode)
+	           << ", length=" << frame.length;
+
+	byte buffer[14];
+	byte *cur = buffer;
+
+	*cur++ = byte((frame.opcode & 0x0F) | (frame.fin ? 0x80 : 0));
+
+	if (frame.length < 0x7E) {
+		*cur++ = byte((frame.length & 0x7F) | (frame.mask ? 0x80 : 0));
+	} else if (frame.length <= 0xFFFF) {
+		*cur++ = byte(0x7E | (frame.mask ? 0x80 : 0));
+		*reinterpret_cast<uint16_t *>(cur) = htons(uint16_t(frame.length));
+		cur += 2;
+	} else {
+		*cur++ = byte(0x7F | (frame.mask ? 0x80 : 0));
+		*reinterpret_cast<uint64_t *>(cur) = htonll(uint64_t(frame.length));
+		cur += 8;
+	}
+
+	if (frame.mask) {
+		auto seed = system_clock::now().time_since_epoch().count();
+		random_bytes_engine generator(seed);
+
+		byte *maskingKey = reinterpret_cast<byte *>(cur);
+
+		auto u = reinterpret_cast<uint8_t *>(maskingKey);
+		std::generate(u, u + 4, generator);
+		cur += 4;
+
+		for (size_t i = 0; i < frame.length; ++i)
+			frame.payload[i] ^= maskingKey[i % 4];
+	}
+
+	outgoing(make_message(buffer, cur));                                        // header
+	return outgoing(make_message(frame.payload, frame.payload + frame.length)); // payload
+}
+
+} // namespace rtc
+
+#endif

src/wstransport.hpp

@@ -0,0 +1,83 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_WS_TRANSPORT_H
+#define RTC_WS_TRANSPORT_H
+
+#if RTC_ENABLE_WEBSOCKET
+
+#include "include.hpp"
+#include "transport.hpp"
+
+namespace rtc {
+
+class TcpTransport;
+class TlsTransport;
+
+class WsTransport : public Transport {
+public:
+	WsTransport(std::shared_ptr<Transport> lower, string host, string path,
+	            message_callback recvCallback, state_callback stateCallback);
+	~WsTransport();
+
+	bool stop() override;
+	bool send(message_ptr message) override;
+	bool send(mutable_message_ptr message);
+
+	void incoming(message_ptr message) override;
+
+	void close();
+
+private:
+	enum Opcode : uint8_t {
+		CONTINUATION = 0,
+		TEXT_FRAME = 1,
+		BINARY_FRAME = 2,
+		CLOSE = 8,
+		PING = 9,
+		PONG = 10,
+	};
+
+	struct Frame {
+		Opcode opcode = BINARY_FRAME;
+		byte *payload = nullptr;
+		size_t length = 0;
+		bool fin = true;
+		bool mask = true;
+	};
+
+	bool sendHttpRequest();
+	size_t readHttpResponse(const byte *buffer, size_t size);
+
+	size_t readFrame(byte *buffer, size_t size, Frame &frame);
+	void recvFrame(const Frame &frame);
+	bool sendFrame(const Frame &frame);
+
+	const string mHost;
+	const string mPath;
+
+	binary mBuffer;
+	binary mPartial;
+	Opcode mPartialOpcode;
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

test/main.cpp

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

test/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
+