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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_BASE_PROXYSERVER_H_
#define TALK_BASE_PROXYSERVER_H_
#include <list>
#include "talk/base/asyncsocket.h"
#include "talk/base/socketadapters.h"
#include "talk/base/socketaddress.h"
#include "talk/base/stream.h"
namespace talk_base {
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);
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;
scoped_ptr<AsyncProxyServerSocket> int_socket_;
scoped_ptr<AsyncSocket> ext_socket_;
bool connected_;
FifoBuffer out_buffer_;
FifoBuffer in_buffer_;
DISALLOW_EVIL_CONSTRUCTORS(ProxyBinding);
};
class ProxyServer : public sigslot::has_slots<> {
public:
ProxyServer(SocketFactory* int_factory, const SocketAddress& int_addr,
SocketFactory* ext_factory, const SocketAddress& ext_ip);
virtual ~ProxyServer();
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_;
scoped_ptr<AsyncSocket> server_socket_;
BindingList bindings_;
DISALLOW_EVIL_CONSTRUCTORS(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) {
return new AsyncSocksProxyServerSocket(socket);
}
DISALLOW_EVIL_CONSTRUCTORS(SocksProxyServer);
};
} // namespace talk_base
#endif // TALK_BASE_PROXYSERVER_H_
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