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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_P2P_BASE_UDPPORT_H_
     29 #define TALK_P2P_BASE_UDPPORT_H_
     30 
     31 #include <string>
     32 
     33 #include "talk/p2p/base/port.h"
     34 
     35 namespace talk_base {
     36 class Thread;
     37 class Network;
     38 class SocketAddress;
     39 }
     40 
     41 namespace cricket {
     42 
     43 extern const std::string LOCAL_PORT_TYPE;  // type of UDP ports
     44 
     45 // Communicates using a local UDP port.
     46 class UDPPort : public Port {
     47  public:
     48   static UDPPort* Create(talk_base::Thread* thread,
     49                          talk_base::PacketSocketFactory* factory,
     50                          talk_base::Network* network,
     51                          uint32 ip, int min_port, int max_port) {
     52     UDPPort* port = new UDPPort(thread, factory, network,
     53                                 ip, min_port, max_port);
     54     if (!port->Init()) {
     55       delete port;
     56       port = NULL;
     57     }
     58     return port;
     59   }
     60   virtual ~UDPPort();
     61 
     62   virtual void PrepareAddress();
     63   virtual Connection* CreateConnection(const Candidate& address,
     64                                        CandidateOrigin origin);
     65 
     66   virtual int SetOption(talk_base::Socket::Option opt, int value);
     67   virtual int GetError();
     68 
     69  protected:
     70   UDPPort(talk_base::Thread* thread, talk_base::PacketSocketFactory* factory,
     71           talk_base::Network* network, uint32 ip, int min_port, int max_port);
     72   bool Init();
     73 
     74   // Handles sending using the local UDP socket.
     75   virtual int SendTo(const void* data, size_t size,
     76                      const talk_base::SocketAddress& remote_addr, bool payload);
     77 
     78   void OnAddresReady(talk_base::AsyncPacketSocket* socket,
     79                      const talk_base::SocketAddress& address);
     80 
     81   // Dispatches the given packet to the port or connection as appropriate.
     82   void OnReadPacket(talk_base::AsyncPacketSocket* socket,
     83                     const char* data, size_t size,
     84                     const talk_base::SocketAddress& remote_addr);
     85 
     86  private:
     87   talk_base::AsyncPacketSocket* socket_;
     88   int error_;
     89 };
     90 
     91 }  // namespace cricket
     92 
     93 #endif  // TALK_P2P_BASE_UDPPORT_H_
     94