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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_PROXYSERVER_H_
#define RTC_BASE_PROXYSERVER_H_
#include <list>
#include <memory>
#include "rtc_base/asyncsocket.h"
#include "rtc_base/constructormagic.h"
#include "rtc_base/socketadapters.h"
#include "rtc_base/socketaddress.h"
#include "rtc_base/stream.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, AsyncSocket* out_socket);
~ProxyBinding() override;
sigslot::signal1<ProxyBinding*> SignalDestroyed;
private:
void OnConnectRequest(AsyncProxyServerSocket* socket,
const SocketAddress& addr);
void OnInternalRead(AsyncSocket* socket);
void OnInternalWrite(AsyncSocket* socket);
void OnInternalClose(AsyncSocket* socket, int err);
void OnExternalConnect(AsyncSocket* socket);
void OnExternalRead(AsyncSocket* socket);
void OnExternalWrite(AsyncSocket* socket);
void OnExternalClose(AsyncSocket* socket, int err);
static void Read(AsyncSocket* socket, FifoBuffer* buffer);
static void Write(AsyncSocket* socket, FifoBuffer* buffer);
void Destroy();
static const int kBufferSize = 4096;
std::unique_ptr<AsyncProxyServerSocket> int_socket_;
std::unique_ptr<AsyncSocket> ext_socket_;
bool connected_;
FifoBuffer out_buffer_;
FifoBuffer in_buffer_;
RTC_DISALLOW_COPY_AND_ASSIGN(ProxyBinding);
};
class ProxyServer : public sigslot::has_slots<> {
public:
ProxyServer(SocketFactory* int_factory, const SocketAddress& int_addr,
SocketFactory* ext_factory, const SocketAddress& ext_ip);
~ProxyServer() override;
// Returns the address to which the proxy server is bound
SocketAddress GetServerAddress();
protected:
void OnAcceptEvent(AsyncSocket* socket);
virtual AsyncProxyServerSocket* WrapSocket(AsyncSocket* socket) = 0;
void OnBindingDestroyed(ProxyBinding* binding);
private:
typedef std::list<ProxyBinding*> BindingList;
SocketFactory* ext_factory_;
SocketAddress ext_ip_;
std::unique_ptr<AsyncSocket> server_socket_;
BindingList bindings_;
RTC_DISALLOW_COPY_AND_ASSIGN(ProxyServer);
};
// 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) {
}
protected:
AsyncProxyServerSocket* WrapSocket(AsyncSocket* socket) override;
RTC_DISALLOW_COPY_AND_ASSIGN(SocksProxyServer);
};
} // namespace rtc
#endif // RTC_BASE_PROXYSERVER_H_
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