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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.
*/
#ifndef RTC_BASE_PROXY_SERVER_H_
#define RTC_BASE_PROXY_SERVER_H_
#include <memory>
#include <vector>
#include "absl/memory/memory.h"
#include "rtc_base/memory/fifo_buffer.h"
#include "rtc_base/server_socket_adapters.h"
#include "rtc_base/socket.h"
#include "rtc_base/socket_address.h"
namespace rtc {
class SocketFactory;
// ProxyServer is a base class that allows for easy construction of proxy
// servers. With its helper class ProxyBinding, it contains all the necessary
// logic for receiving and bridging connections. The specific client-server
// proxy protocol is implemented by an instance of the AsyncProxyServerSocket
// class; children of ProxyServer implement WrapSocket appropriately to return
// the correct protocol handler.
class ProxyBinding : public sigslot::has_slots<> {
public:
ProxyBinding(AsyncProxyServerSocket* in_socket, Socket* out_socket);
~ProxyBinding() override;
ProxyBinding(const ProxyBinding&) = delete;
ProxyBinding& operator=(const ProxyBinding&) = delete;
sigslot::signal1<ProxyBinding*> SignalDestroyed;
private:
void OnConnectRequest(AsyncProxyServerSocket* socket,
const SocketAddress& addr);
void OnInternalRead(Socket* socket);
void OnInternalWrite(Socket* socket);
void OnInternalClose(Socket* socket, int err);
void OnExternalConnect(Socket* socket);
void OnExternalRead(Socket* socket);
void OnExternalWrite(Socket* socket);
void OnExternalClose(Socket* socket, int err);
static void Read(Socket* socket, FifoBuffer* buffer);
static void Write(Socket* socket, FifoBuffer* buffer);
void Destroy();
static const int kBufferSize = 4096;
std::unique_ptr<AsyncProxyServerSocket> int_socket_;
std::unique_ptr<Socket> ext_socket_;
bool connected_;
FifoBuffer out_buffer_;
FifoBuffer in_buffer_;
};
class ProxyServer : public sigslot::has_slots<> {
public:
ProxyServer(SocketFactory* int_factory,
const SocketAddress& int_addr,
SocketFactory* ext_factory,
const SocketAddress& ext_ip);
~ProxyServer() override;
ProxyServer(const ProxyServer&) = delete;
ProxyServer& operator=(const ProxyServer&) = delete;
// Returns the address to which the proxy server is bound
SocketAddress GetServerAddress();
protected:
void OnAcceptEvent(Socket* socket);
virtual AsyncProxyServerSocket* WrapSocket(Socket* socket) = 0;
private:
SocketFactory* ext_factory_;
SocketAddress ext_ip_;
std::unique_ptr<Socket> server_socket_;
std::vector<std::unique_ptr<ProxyBinding>> bindings_;
};
// SocksProxyServer is a simple extension of ProxyServer to implement SOCKS.
class SocksProxyServer : public ProxyServer {
public:
SocksProxyServer(SocketFactory* int_factory,
const SocketAddress& int_addr,
SocketFactory* ext_factory,
const SocketAddress& ext_ip)
: ProxyServer(int_factory, int_addr, ext_factory, ext_ip) {}
SocksProxyServer(const SocksProxyServer&) = delete;
SocksProxyServer& operator=(const SocksProxyServer&) = delete;
protected:
AsyncProxyServerSocket* WrapSocket(Socket* socket) override;
};
} // namespace rtc
#endif // RTC_BASE_PROXY_SERVER_H_
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