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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_STUNPORT_H_
     29 #define TALK_P2P_BASE_STUNPORT_H_
     30 
     31 #include <string>
     32 
     33 #include "talk/base/asyncpacketsocket.h"
     34 #include "talk/p2p/base/udpport.h"
     35 #include "talk/p2p/base/stunrequest.h"
     36 
     37 namespace talk_base {
     38 class AsyncResolver;
     39 class SignalThread;
     40 }
     41 
     42 namespace cricket {
     43 
     44 extern const std::string STUN_PORT_TYPE;
     45 
     46 // Communicates using the address on the outside of a NAT.
     47 class StunPort : public Port {
     48  public:
     49   static StunPort* Create(talk_base::Thread* thread,
     50                           talk_base::PacketSocketFactory* factory,
     51                           talk_base::Network* network,
     52                           uint32 ip, int min_port, int max_port,
     53                           const talk_base::SocketAddress& server_addr) {
     54     StunPort* port = new StunPort(thread, factory, network,
     55                                   ip, min_port, max_port, server_addr);
     56     if (!port->Init()) {
     57       delete port;
     58       port = NULL;
     59     }
     60     return port;
     61   }
     62   virtual ~StunPort();
     63 
     64   const talk_base::SocketAddress& server_addr() const { return server_addr_; }
     65   void set_server_addr(const talk_base::SocketAddress& addr) {
     66     server_addr_ = addr;
     67   }
     68 
     69   const talk_base::SocketAddress& server_addr2() const { return server_addr2_; }
     70   void set_server_addr2(const talk_base::SocketAddress& addr) {
     71     server_addr2_ = addr;
     72   }
     73 
     74   virtual void PrepareAddress();
     75 
     76   // This will contact the secondary server and signal another candidate
     77   // address for this port (which may be the same as the first address).
     78   void PrepareSecondaryAddress();
     79 
     80   virtual Connection* CreateConnection(const Candidate& address,
     81                                        CandidateOrigin origin);
     82   virtual int SetOption(talk_base::Socket::Option opt, int value);
     83   virtual int GetError();
     84 
     85  protected:
     86   StunPort(talk_base::Thread* thread, talk_base::PacketSocketFactory* factory,
     87            talk_base::Network* network, uint32 ip, int min_port, int max_port,
     88            const talk_base::SocketAddress& server_addr);
     89   bool Init();
     90 
     91   virtual int SendTo(const void* data, size_t size,
     92                      const talk_base::SocketAddress& addr, bool payload);
     93 
     94   void OnReadPacket(talk_base::AsyncPacketSocket* socket,
     95                     const char* data, size_t size,
     96                     const talk_base::SocketAddress& remote_addr);
     97 
     98  private:
     99   // DNS resolution of the STUN server.
    100   void ResolveStunAddress();
    101   void OnResolveResult(talk_base::SignalThread* thread);
    102   // Sends STUN requests to the server.
    103   void OnSendPacket(const void* data, size_t size, StunRequest* req);
    104 
    105   talk_base::SocketAddress server_addr_;
    106   talk_base::SocketAddress server_addr2_;
    107   StunRequestManager requests_;
    108   talk_base::AsyncPacketSocket* socket_;
    109   int error_;
    110   talk_base::AsyncResolver* resolver_;
    111 
    112   friend class StunPortBindingRequest;
    113 };
    114 
    115 }  // namespace cricket
    116 
    117 #endif  // TALK_P2P_BASE_STUNPORT_H_
    118