1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/async_udp_socket.h"
#include <stdint.h>
#include <string>
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/network/sent_packet.h"
#include "rtc_base/third_party/sigslot/sigslot.h"
#include "rtc_base/time_utils.h"
#include "system_wrappers/include/field_trial.h"
namespace rtc {
// Returns true if the the client is in the experiment to get timestamps
// from the socket implementation.
static bool IsScmTimeStampExperimentEnabled() {
return webrtc::field_trial::IsEnabled("WebRTC-SCM-Timestamp");
}
AsyncUDPSocket* AsyncUDPSocket::Create(Socket* socket,
const SocketAddress& bind_address) {
std::unique_ptr<Socket> owned_socket(socket);
if (socket->Bind(bind_address) < 0) {
RTC_LOG(LS_ERROR) << "Bind() failed with error " << socket->GetError();
return nullptr;
}
return new AsyncUDPSocket(owned_socket.release());
}
AsyncUDPSocket* AsyncUDPSocket::Create(SocketFactory* factory,
const SocketAddress& bind_address) {
Socket* socket = factory->CreateSocket(bind_address.family(), SOCK_DGRAM);
if (!socket)
return nullptr;
return Create(socket, bind_address);
}
AsyncUDPSocket::AsyncUDPSocket(Socket* socket) : socket_(socket) {
sequence_checker_.Detach();
// The socket should start out readable but not writable.
socket_->SignalReadEvent.connect(this, &AsyncUDPSocket::OnReadEvent);
socket_->SignalWriteEvent.connect(this, &AsyncUDPSocket::OnWriteEvent);
}
SocketAddress AsyncUDPSocket::GetLocalAddress() const {
return socket_->GetLocalAddress();
}
SocketAddress AsyncUDPSocket::GetRemoteAddress() const {
return socket_->GetRemoteAddress();
}
int AsyncUDPSocket::Send(const void* pv,
size_t cb,
const rtc::PacketOptions& options) {
rtc::SentPacket sent_packet(options.packet_id, rtc::TimeMillis(),
options.info_signaled_after_sent);
CopySocketInformationToPacketInfo(cb, *this, false, &sent_packet.info);
int ret = socket_->Send(pv, cb);
SignalSentPacket(this, sent_packet);
return ret;
}
int AsyncUDPSocket::SendTo(const void* pv,
size_t cb,
const SocketAddress& addr,
const rtc::PacketOptions& options) {
rtc::SentPacket sent_packet(options.packet_id, rtc::TimeMillis(),
options.info_signaled_after_sent);
CopySocketInformationToPacketInfo(cb, *this, true, &sent_packet.info);
int ret = socket_->SendTo(pv, cb, addr);
SignalSentPacket(this, sent_packet);
return ret;
}
int AsyncUDPSocket::Close() {
return socket_->Close();
}
AsyncUDPSocket::State AsyncUDPSocket::GetState() const {
return STATE_BOUND;
}
int AsyncUDPSocket::GetOption(Socket::Option opt, int* value) {
return socket_->GetOption(opt, value);
}
int AsyncUDPSocket::SetOption(Socket::Option opt, int value) {
return socket_->SetOption(opt, value);
}
int AsyncUDPSocket::GetError() const {
return socket_->GetError();
}
void AsyncUDPSocket::SetError(int error) {
return socket_->SetError(error);
}
void AsyncUDPSocket::OnReadEvent(Socket* socket) {
RTC_DCHECK(socket_.get() == socket);
RTC_DCHECK_RUN_ON(&sequence_checker_);
SocketAddress remote_addr;
int64_t timestamp = -1;
int len = socket_->RecvFrom(buf_, BUF_SIZE, &remote_addr, ×tamp);
if (len < 0) {
// An error here typically means we got an ICMP error in response to our
// send datagram, indicating the remote address was unreachable.
// When doing ICE, this kind of thing will often happen.
// TODO: Do something better like forwarding the error to the user.
SocketAddress local_addr = socket_->GetLocalAddress();
RTC_LOG(LS_INFO) << "AsyncUDPSocket[" << local_addr.ToSensitiveString()
<< "] receive failed with error " << socket_->GetError();
return;
}
if (timestamp == -1) {
// Timestamp from socket is not available.
timestamp = TimeMicros();
} else {
if (!socket_time_offset_) {
socket_time_offset_ =
IsScmTimeStampExperimentEnabled() ? TimeMicros() - timestamp : 0;
}
timestamp += *socket_time_offset_;
}
// TODO: Make sure that we got all of the packet.
// If we did not, then we should resize our buffer to be large enough.
SignalReadPacket(this, buf_, static_cast<size_t>(len), remote_addr,
timestamp);
}
void AsyncUDPSocket::OnWriteEvent(Socket* socket) {
SignalReadyToSend(this);
}
} // namespace rtc
|
