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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 : UdpTransportChannel(transport_name, | |
29 rtc::Thread::Current()->socketserver()) {} | |
30 | |
31 UdpTransportChannel::UdpTransportChannel(const std::string& transport_name, | |
32 rtc::SocketServer* socket_server) | |
33 : transport_name_(transport_name), socket_server_(socket_server) {} | |
34 | |
35 UdpTransportChannel::~UdpTransportChannel() { | |
36 RTC_DCHECK_RUN_ON(&network_thread_checker_); | |
37 } | |
38 | |
39 void UdpTransportChannel::OnSocketReadPacket( | |
40 rtc::AsyncPacketSocket* socket, | |
41 const char* data, | |
42 size_t len, | |
43 const rtc::SocketAddress& remote_addr, | |
44 const rtc::PacketTime& packet_time) { | |
45 // No thread_checker in high frequency network function. | |
46 SignalReadPacket(this, data, len, packet_time, 0); | |
47 } | |
48 | |
49 void UdpTransportChannel::OnSocketSentPacket(rtc::AsyncPacketSocket* socket, | |
50 const rtc::SentPacket& packet) { | |
51 RTC_DCHECK_EQ(socket_.get(), socket); | |
52 SignalSentPacket(this, packet); | |
53 } | |
54 | |
55 bool UdpTransportChannel::writable() const { | |
56 return state_ == State::CONNECTED; | |
57 } | |
58 | |
59 int UdpTransportChannel::SendPacket(const char* data, | |
60 size_t len, | |
61 const rtc::PacketOptions& options, | |
62 int flags) { | |
63 // No thread_checker in high frequency network function. | |
64 if (!remote_parameters_) { | |
65 LOG(LS_WARNING) << "Remote parameters not set."; | |
66 send_error_ = ENOTCONN; | |
67 return -1; | |
68 } | |
69 const rtc::SocketAddress& remote_addr_ = *remote_parameters_; | |
70 int result = socket_->SendTo((const void*)data, len, remote_addr_, options); | |
71 if (result <= 0) { | |
72 LOG(LS_VERBOSE) << "SendPacket() " << result; | |
73 } | |
74 return result; | |
75 } | |
76 | |
77 void UdpTransportChannel::Start() { | |
78 RTC_DCHECK_RUN_ON(&network_thread_checker_); | |
79 if (socket_) { | |
80 LOG(LS_WARNING) << "Local socket already allocated."; | |
81 return; | |
82 } | |
83 static constexpr uint16_t kMaxTries = 100; | |
84 static constexpr uint16_t kMinPortNumber = 2000; | |
85 // TODO(johan) provide configuration option for kMinPortNumber. | |
86 rtc::SocketAddress socket_addr("0.0.0.0", 0); | |
87 // TODO(johan): Replace BasicPacketSocketFactory by something that honors RFC | |
88 // 3550 Section 11 port number requirements like | |
89 // {port_{RTP} is even, port_{RTCP} := port{RTP} + 1}. | |
90 rtc::BasicPacketSocketFactory socket_factory(socket_server_); | |
91 socket_.reset(socket_factory.CreateUdpSocket(socket_addr, kMinPortNumber, | |
92 kMinPortNumber + kMaxTries)); | |
93 if (socket_) { | |
94 local_parameters_ = | |
95 rtc::Optional<rtc::SocketAddress>(socket_->GetLocalAddress()); | |
96 LOG(INFO) << "Created UDP socket with addr " << local_parameters_->ipaddr() | |
97 << " port " << local_parameters_->port() << "."; | |
98 socket_->SignalReadPacket.connect(this, | |
99 &UdpTransportChannel::OnSocketReadPacket); | |
100 socket_->SignalSentPacket.connect(this, | |
101 &UdpTransportChannel::OnSocketSentPacket); | |
102 } else { | |
103 LOG(INFO) << "Local socket allocation failure"; | |
104 } | |
105 UpdateState(); | |
106 return; | |
107 } | |
108 | |
109 void UdpTransportChannel::UpdateState() { | |
110 RTC_DCHECK_RUN_ON(&network_thread_checker_); | |
111 RTC_DCHECK(!(local_parameters_ && !socket_)); | |
112 RTC_DCHECK(!(!local_parameters_ && socket_)); | |
113 if (!local_parameters_) { | |
114 SetState(State::INIT); | |
115 } else if (!remote_parameters_) { | |
116 SetState(State::CONNECTING); | |
117 } else { | |
118 SetState(State::CONNECTED); | |
119 } | |
120 } | |
121 | |
122 void UdpTransportChannel::SetRemoteParameters(const rtc::SocketAddress& addr) { | |
123 RTC_DCHECK_RUN_ON(&network_thread_checker_); | |
124 if (!addr.IsComplete()) { | |
125 LOG(INFO) << "remote address not complete"; | |
126 return; | |
127 } | |
128 // TODO(johan) check for ipv4, other settings. | |
129 remote_parameters_ = rtc::Optional<rtc::SocketAddress>(addr); | |
130 UpdateState(); | |
131 } | |
132 | |
133 void UdpTransportChannel::SetState(State state) { | |
134 RTC_DCHECK_RUN_ON(&network_thread_checker_); | |
135 if (state_ == state) { | |
136 return; | |
137 } | |
138 state_ = state; | |
139 if (state == State::CONNECTED) { | |
140 SignalWritableState(this); | |
141 SignalReadyToSend(this); | |
142 } | |
143 } | |
144 } // namespace cricket | |
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