third_party/libjingle/source/talk/p2p/base/tcpport.h

/*
 * 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
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 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef TALK_P2P_BASE_TCPPORT_H_
#define TALK_P2P_BASE_TCPPORT_H_

#include <string>
#include <list>
#include "talk/base/asyncpacketsocket.h"
#include "talk/p2p/base/port.h"

namespace cricket {

class TCPConnection;

extern const char LOCAL_PORT_TYPE[];  // type of TCP ports

// Communicates using a local TCP port.
//
// This class is designed to allow subclasses to take advantage of the
// connection management provided by this class.  A subclass should take of all
// packet sending and preparation, but when a packet is received, it should
// call this TCPPort::OnReadPacket (3 arg) to dispatch to a connection.
class TCPPort : public Port {
 public:
  static TCPPort* Create(talk_base::Thread* thread,
                         talk_base::PacketSocketFactory* factory,
                         talk_base::Network* network,
                         const talk_base::IPAddress& ip,
                         int min_port, int max_port,
                         bool allow_listen) {
    TCPPort* port = new TCPPort(thread, factory, network,
                                ip, min_port, max_port, allow_listen);
    if (!port->Init()) {
      delete port;
      port = NULL;
    }
    return port;
  }
  virtual ~TCPPort();

  virtual Connection* CreateConnection(const Candidate& address,
                                       CandidateOrigin origin);

  virtual void PrepareAddress();

  virtual int GetOption(talk_base::Socket::Option opt, int* value);
  virtual int SetOption(talk_base::Socket::Option opt, int value);
  virtual int GetError();

 protected:
  TCPPort(talk_base::Thread* thread, talk_base::PacketSocketFactory* factory,
          talk_base::Network* network, const talk_base::IPAddress& ip,
          int min_port, int max_port, bool allow_listen);
  bool Init();

  // Handles sending using the local TCP socket.
  virtual int SendTo(const void* data, size_t size,
                     const talk_base::SocketAddress& addr, bool payload);

  // Accepts incoming TCP connection.
  void OnNewConnection(talk_base::AsyncPacketSocket* socket,
                       talk_base::AsyncPacketSocket* new_socket);

 private:
  struct Incoming {
    talk_base::SocketAddress addr;
    talk_base::AsyncPacketSocket* socket;
  };

  talk_base::AsyncPacketSocket* GetIncoming(
      const talk_base::SocketAddress& addr, bool remove = false);

  // Receives packet signal from the local TCP Socket.
  void OnReadPacket(talk_base::AsyncPacketSocket* socket,
                    const char* data, size_t size,
                    const talk_base::SocketAddress& remote_addr);

  void OnAddressReady(talk_base::AsyncPacketSocket* socket,
                      const talk_base::SocketAddress& address);

  // TODO: Is this still needed?
  bool incoming_only_;
  bool allow_listen_;
  talk_base::AsyncPacketSocket* socket_;
  int error_;
  std::list<Incoming> incoming_;

  friend class TCPConnection;
};

class TCPConnection : public Connection {
 public:
  // Connection is outgoing unless socket is specified
  TCPConnection(TCPPort* port, const Candidate& candidate,
                talk_base::AsyncPacketSocket* socket = 0);
  virtual ~TCPConnection();

  virtual int Send(const void* data, size_t size);
  virtual int GetError();

  talk_base::AsyncPacketSocket* socket() { return socket_; }

 private:
  void OnConnect(talk_base::AsyncPacketSocket* socket);
  void OnClose(talk_base::AsyncPacketSocket* socket, int error);
  void OnReadPacket(talk_base::AsyncPacketSocket* socket,
                    const char* data, size_t size,
                    const talk_base::SocketAddress& remote_addr);

  talk_base::AsyncPacketSocket* socket_;
  int error_;

  friend class TCPPort;
};

}  // namespace cricket

#endif  // TALK_P2P_BASE_TCPPORT_H_