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
152
|
/*
* 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/proxy_server.h"
#include <stddef.h>
#include <memory>
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/socket_factory.h"
namespace rtc {
// ProxyServer
ProxyServer::ProxyServer(SocketFactory* int_factory,
const SocketAddress& int_addr,
SocketFactory* ext_factory,
const SocketAddress& ext_ip)
: ext_factory_(ext_factory),
ext_ip_(ext_ip.ipaddr(), 0), // strip off port
server_socket_(
int_factory->CreateSocket(int_addr.family(), SOCK_STREAM)) {
RTC_DCHECK(server_socket_.get() != nullptr);
RTC_DCHECK(int_addr.family() == AF_INET || int_addr.family() == AF_INET6);
server_socket_->Bind(int_addr);
server_socket_->Listen(5);
server_socket_->SignalReadEvent.connect(this, &ProxyServer::OnAcceptEvent);
}
ProxyServer::~ProxyServer() = default;
SocketAddress ProxyServer::GetServerAddress() {
return server_socket_->GetLocalAddress();
}
void ProxyServer::OnAcceptEvent(Socket* socket) {
RTC_DCHECK(socket);
RTC_DCHECK_EQ(socket, server_socket_.get());
Socket* int_socket = socket->Accept(nullptr);
AsyncProxyServerSocket* wrapped_socket = WrapSocket(int_socket);
Socket* ext_socket =
ext_factory_->CreateSocket(ext_ip_.family(), SOCK_STREAM);
if (ext_socket) {
ext_socket->Bind(ext_ip_);
bindings_.emplace_back(
std::make_unique<ProxyBinding>(wrapped_socket, ext_socket));
} else {
RTC_LOG(LS_ERROR)
<< "Unable to create external socket on proxy accept event";
}
}
// ProxyBinding
ProxyBinding::ProxyBinding(AsyncProxyServerSocket* int_socket,
Socket* ext_socket)
: int_socket_(int_socket),
ext_socket_(ext_socket),
connected_(false),
out_buffer_(kBufferSize),
in_buffer_(kBufferSize) {
int_socket_->SignalConnectRequest.connect(this,
&ProxyBinding::OnConnectRequest);
int_socket_->SignalReadEvent.connect(this, &ProxyBinding::OnInternalRead);
int_socket_->SignalWriteEvent.connect(this, &ProxyBinding::OnInternalWrite);
int_socket_->SignalCloseEvent.connect(this, &ProxyBinding::OnInternalClose);
ext_socket_->SignalConnectEvent.connect(this,
&ProxyBinding::OnExternalConnect);
ext_socket_->SignalReadEvent.connect(this, &ProxyBinding::OnExternalRead);
ext_socket_->SignalWriteEvent.connect(this, &ProxyBinding::OnExternalWrite);
ext_socket_->SignalCloseEvent.connect(this, &ProxyBinding::OnExternalClose);
}
ProxyBinding::~ProxyBinding() = default;
void ProxyBinding::OnConnectRequest(AsyncProxyServerSocket* socket,
const SocketAddress& addr) {
RTC_DCHECK(!connected_);
RTC_DCHECK(ext_socket_);
ext_socket_->Connect(addr);
// TODO: handle errors here
}
void ProxyBinding::OnInternalRead(Socket* socket) {
Read(int_socket_.get(), &out_buffer_);
Write(ext_socket_.get(), &out_buffer_);
}
void ProxyBinding::OnInternalWrite(Socket* socket) {
Write(int_socket_.get(), &in_buffer_);
}
void ProxyBinding::OnInternalClose(Socket* socket, int err) {
Destroy();
}
void ProxyBinding::OnExternalConnect(Socket* socket) {
RTC_DCHECK(socket != nullptr);
connected_ = true;
int_socket_->SendConnectResult(0, socket->GetRemoteAddress());
}
void ProxyBinding::OnExternalRead(Socket* socket) {
Read(ext_socket_.get(), &in_buffer_);
Write(int_socket_.get(), &in_buffer_);
}
void ProxyBinding::OnExternalWrite(Socket* socket) {
Write(ext_socket_.get(), &out_buffer_);
}
void ProxyBinding::OnExternalClose(Socket* socket, int err) {
if (!connected_) {
int_socket_->SendConnectResult(err, SocketAddress());
}
Destroy();
}
void ProxyBinding::Read(Socket* socket, FifoBuffer* buffer) {
// Only read if the buffer is empty.
RTC_DCHECK(socket != nullptr);
size_t size;
int read;
if (buffer->GetBuffered(&size) && size == 0) {
void* p = buffer->GetWriteBuffer(&size);
read = socket->Recv(p, size, nullptr);
buffer->ConsumeWriteBuffer(std::max(read, 0));
}
}
void ProxyBinding::Write(Socket* socket, FifoBuffer* buffer) {
RTC_DCHECK(socket != nullptr);
size_t size;
int written;
const void* p = buffer->GetReadData(&size);
written = socket->Send(p, size);
buffer->ConsumeReadData(std::max(written, 0));
}
void ProxyBinding::Destroy() {
SignalDestroyed(this);
}
} // namespace rtc
|
