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/*
* 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 <algorithm>
#include <memory>
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/memory/fifo_buffer.h"
#include "rtc_base/net_helpers.h"
#include "rtc_base/server_socket_adapters.h"
#include "rtc_base/socket.h"
#include "rtc_base/socket_address.h"
#include "rtc_base/socket_factory.h"
namespace webrtc {
// 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 webrtc
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