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| 1 /* |
| 2 * Copyright 2016 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #include "webrtc/p2p/base/udptransportchannel.h" |
| 12 |
| 13 #include <string> |
| 14 |
| 15 #include "webrtc/base/asyncudpsocket.h" |
| 16 #include "webrtc/base/asyncpacketsocket.h" |
| 17 #include "webrtc/base/logging.h" |
| 18 #include "webrtc/base/physicalsocketserver.h" |
| 19 #include "webrtc/base/socketaddress.h" |
| 20 #include "webrtc/base/thread.h" |
| 21 #include "webrtc/base/thread_checker.h" |
| 22 #include "webrtc/p2p/base/basicpacketsocketfactory.h" |
| 23 #include "webrtc/p2p/base/packettransportinterface.h" |
| 24 |
| 25 namespace cricket { |
| 26 |
| 27 UdpTransportChannel::UdpTransportChannel(const std::string& transport_name, |
| 28 int component) |
| 29 : UdpTransportChannel(transport_name, |
| 30 component, |
| 31 rtc::Thread::Current()->socketserver()) {} |
| 32 |
| 33 UdpTransportChannel::UdpTransportChannel(const std::string& transport_name, |
| 34 int component, |
| 35 rtc::SocketServer* socket_server) |
| 36 : transport_name_(transport_name), |
| 37 component_(component), |
| 38 socket_server_(socket_server) { |
| 39 UpdateDebugName(); |
| 40 } |
| 41 |
| 42 UdpTransportChannel::~UdpTransportChannel() { |
| 43 RTC_DCHECK_RUN_ON(&network_thread_checker_); |
| 44 } |
| 45 |
| 46 void UdpTransportChannel::OnSocketReadPacket( |
| 47 rtc::AsyncPacketSocket* socket, |
| 48 const char* data, |
| 49 size_t len, |
| 50 const rtc::SocketAddress& remote_addr, |
| 51 const rtc::PacketTime& packet_time) { |
| 52 // No thread_checker in high frequency network function. |
| 53 SignalReadPacket(this, data, len, packet_time, 0); |
| 54 } |
| 55 |
| 56 void UdpTransportChannel::OnSocketSentPacket(rtc::AsyncPacketSocket* socket, |
| 57 const rtc::SentPacket& packet) { |
| 58 RTC_DCHECK_EQ(socket_.get(), socket); |
| 59 SignalSentPacket(this, packet); |
| 60 } |
| 61 |
| 62 void UdpTransportChannel::UpdateDebugName() { |
| 63 debug_name_ = transport_name_ + " " + std::to_string(component_); |
| 64 } |
| 65 |
| 66 bool UdpTransportChannel::writable() const { |
| 67 return state_ == UDPTRANSPORT_STATE_COMPLETED; |
| 68 } |
| 69 |
| 70 int UdpTransportChannel::SendPacket(const char* data, |
| 71 size_t len, |
| 72 const rtc::PacketOptions& options, |
| 73 int flags) { |
| 74 // No thread_checker in high frequency network function. |
| 75 if (!remote_parameters_) { |
| 76 LOG(LS_WARNING) << "Remote parameters not set."; |
| 77 send_error_ = ENOTCONN; |
| 78 return -1; |
| 79 } |
| 80 const rtc::SocketAddress& remote_addr_ = *remote_parameters_; |
| 81 int result = socket_->SendTo((const void*)data, len, remote_addr_, options); |
| 82 if (result <= 0) { |
| 83 LOG(LS_VERBOSE) << "SendPacket() " << result; |
| 84 } |
| 85 return result; |
| 86 } |
| 87 |
| 88 void UdpTransportChannel::CreateSocket() { |
| 89 RTC_DCHECK_RUN_ON(&network_thread_checker_); |
| 90 if ((state_ == UDPTRANSPORT_STATE_CONNECTING) || |
| 91 (state_ == UDPTRANSPORT_STATE_COMPLETED)) { |
| 92 LOG(LS_WARNING) << "Local socket already allocated."; |
| 93 return; |
| 94 } |
| 95 static constexpr uint16_t kMaxTries = 100; |
| 96 static constexpr uint16_t kMinPortNumber = 2000; |
| 97 // TODO(johan) provide configuration option for kMinPortNumber. |
| 98 rtc::SocketAddress socket_addr("0.0.0.0", 0); |
| 99 // TODO(johan): Replace BasicPacketSocketFactory by something that honors RFC |
| 100 // 3550 Section 11 port number requirements like |
| 101 // {port_{RTP} is even, port_{RTCP} := port{RTP} + 1}. |
| 102 // This could be a SetSocket(...) method for sockets allocated at a higher |
| 103 // control level. |
| 104 rtc::BasicPacketSocketFactory socket_factory(socket_server_); |
| 105 socket_.reset(socket_factory.CreateUdpSocket(socket_addr, kMinPortNumber, |
| 106 kMinPortNumber + kMaxTries)); |
| 107 if (socket_) { |
| 108 uint16_t port = socket_->GetLocalAddress().port(); |
| 109 LOG(INFO) << "Created UDP socket with port " << port << "."; |
| 110 socket_->SignalReadPacket.connect(this, |
| 111 &UdpTransportChannel::OnSocketReadPacket); |
| 112 socket_->SignalSentPacket.connect(this, |
| 113 &UdpTransportChannel::OnSocketSentPacket); |
| 114 socket_addr.SetPort(port); |
| 115 local_parameters_ = rtc::Optional<rtc::SocketAddress>(socket_addr); |
| 116 } else { |
| 117 LOG(INFO) << "Local socket allocation failure"; |
| 118 } |
| 119 UpdateState(); |
| 120 return; |
| 121 } |
| 122 |
| 123 void UdpTransportChannel::UpdateState() { |
| 124 RTC_DCHECK_RUN_ON(&network_thread_checker_); |
| 125 UdpTransportState state; |
| 126 if (local_parameters_ && !socket_) { |
| 127 LOG(INFO) << "local address is set, but socket is null"; |
| 128 state = UDPTRANSPORT_STATE_FAILED; |
| 129 } else if (!local_parameters_ && !remote_parameters_) { |
| 130 state = UDPTRANSPORT_STATE_INIT; |
| 131 } else if (local_parameters_ && !remote_parameters_) { |
| 132 state = UDPTRANSPORT_STATE_CONNECTING; |
| 133 } else if (local_parameters_ && remote_parameters_) { |
| 134 state = UDPTRANSPORT_STATE_COMPLETED; |
| 135 } else { |
| 136 state = UDPTRANSPORT_STATE_FAILED; |
| 137 } |
| 138 SetTransportChannelState(state); |
| 139 } |
| 140 |
| 141 void UdpTransportChannel::SetRemoteParameters(const rtc::SocketAddress& addr) { |
| 142 RTC_DCHECK_RUN_ON(&network_thread_checker_); |
| 143 if (!addr.IsComplete()) { |
| 144 LOG(INFO) << "remote address not complete"; |
| 145 return; |
| 146 } |
| 147 // TODO(johan) check for ipv4, other settings. |
| 148 remote_parameters_ = rtc::Optional<rtc::SocketAddress>(addr); |
| 149 UpdateState(); |
| 150 } |
| 151 |
| 152 const rtc::SocketAddress& UdpTransportChannel::local_parameters() { |
| 153 static const rtc::SocketAddress default_addr; |
| 154 return local_parameters_.value_or(default_addr); |
| 155 } |
| 156 |
| 157 void UdpTransportChannel::SetTransportChannelState(UdpTransportState state) { |
| 158 RTC_DCHECK_RUN_ON(&network_thread_checker_); |
| 159 if (state_ == state) { |
| 160 return; |
| 161 } |
| 162 state_ = state; |
| 163 if (state == UDPTRANSPORT_STATE_COMPLETED) { |
| 164 SignalWritableState(this); |
| 165 SignalReadyToSend(this); |
| 166 } |
| 167 } |
| 168 } // namespace cricket |
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