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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_STUNSERVER_H_
     29 #define TALK_P2P_BASE_STUNSERVER_H_
     30 
     31 #include "talk/base/asyncudpsocket.h"
     32 #include "talk/base/scoped_ptr.h"
     33 #include "talk/p2p/base/stun.h"
     34 
     35 namespace cricket {
     36 
     37 const int STUN_SERVER_PORT = 3478;
     38 
     39 class StunServer : public sigslot::has_slots<> {
     40  public:
     41   // Creates a STUN server, which will listen on the given socket.
     42   explicit StunServer(talk_base::AsyncUDPSocket* socket);
     43   // Removes the STUN server from the socket and deletes the socket.
     44   ~StunServer();
     45 
     46  protected:
     47   // Slot for AsyncSocket.PacketRead:
     48   void OnPacket(
     49       talk_base::AsyncPacketSocket* socket, const char* buf, size_t size,
     50       const talk_base::SocketAddress& remote_addr);
     51 
     52   // Handlers for the different types of STUN/TURN requests:
     53   void OnBindingRequest(StunMessage* msg,
     54       const talk_base::SocketAddress& addr);
     55   void OnAllocateRequest(StunMessage* msg,
     56       const talk_base::SocketAddress& addr);
     57   void OnSharedSecretRequest(StunMessage* msg,
     58       const talk_base::SocketAddress& addr);
     59   void OnSendRequest(StunMessage* msg,
     60       const talk_base::SocketAddress& addr);
     61 
     62   // Sends an error response to the given message back to the user.
     63   void SendErrorResponse(
     64       const StunMessage& msg, const talk_base::SocketAddress& addr,
     65       int error_code, const char* error_desc);
     66 
     67   // Sends the given message to the appropriate destination.
     68   void SendResponse(const StunMessage& msg,
     69        const talk_base::SocketAddress& addr);
     70 
     71  private:
     72   talk_base::scoped_ptr<talk_base::AsyncUDPSocket> socket_;
     73 };
     74 
     75 }  // namespace cricket
     76 
     77 #endif  // TALK_P2P_BASE_STUNSERVER_H_
     78