Home | History | Annotate | Download | only in base 
      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_RAWTRANSPORTCHANNEL_H_
     29 #define TALK_P2P_BASE_RAWTRANSPORTCHANNEL_H_
     30 
     31 #include <string>
     32 #include <vector>
     33 #include "talk/base/messagequeue.h"
     34 #include "talk/p2p/base/transportchannelimpl.h"
     35 #include "talk/p2p/base/rawtransport.h"
     36 #include "talk/p2p/base/candidate.h"
     37 
     38 #if defined(FEATURE_ENABLE_PSTN)
     39 
     40 namespace talk_base {
     41 class Thread;
     42 }
     43 
     44 namespace cricket {
     45 
     46 class Port;
     47 class Connection;
     48 class StunPort;
     49 class RelayPort;
     50 class PortAllocator;
     51 class PortAllocatorSession;
     52 
     53 // Implements a channel that just sends bare packets once we have received the
     54 // address of the other side.  We pick a single address to send them based on
     55 // a simple investigation of NAT type.
     56 class RawTransportChannel : public TransportChannelImpl,
     57     public talk_base::MessageHandler {
     58  public:
     59   RawTransportChannel(const std::string &name,
     60                       const std::string &content_type,
     61                       RawTransport* transport,
     62                       talk_base::Thread *worker_thread,
     63                       PortAllocator *allocator);
     64   virtual ~RawTransportChannel();
     65 
     66   // Implementation of normal channel packet sending.
     67   virtual int SendPacket(const char *data, size_t len);
     68   virtual int SetOption(talk_base::Socket::Option opt, int value);
     69   virtual int GetError();
     70 
     71   // Returns the raw transport that created this channel.
     72   virtual Transport* GetTransport() { return raw_transport_; }
     73 
     74   // Creates an allocator session to start figuring out which type of
     75   // port we should send to the other client.  This will send
     76   // SignalAvailableCandidate once we have decided.
     77   virtual void Connect();
     78 
     79   // Resets state back to unconnected.
     80   virtual void Reset();
     81 
     82   // We don't actually worry about signaling since we can't send new candidates.
     83   virtual void OnSignalingReady() {}
     84 
     85   // Handles a message setting the remote address.  We are writable once we
     86   // have this since we now know where to send.
     87   virtual void OnCandidate(const Candidate& candidate);
     88 
     89   void OnRemoteAddress(const talk_base::SocketAddress& remote_address);
     90 
     91 
     92  private:
     93   RawTransport* raw_transport_;
     94   talk_base::Thread *worker_thread_;
     95   PortAllocator* allocator_;
     96   PortAllocatorSession* allocator_session_;
     97   StunPort* stun_port_;
     98   RelayPort* relay_port_;
     99   Port* port_;
    100   bool use_relay_;
    101   talk_base::SocketAddress remote_address_;
    102 
    103   // Called when the allocator creates another port.
    104   void OnPortReady(PortAllocatorSession* session, Port* port);
    105 
    106   // Called when one of the ports we are using has determined its address.
    107   void OnCandidatesReady(PortAllocatorSession *session,
    108                          const std::vector<Candidate>& candidates);
    109 
    110   // Called once we have chosen the port to use for communication with the
    111   // other client.  This will send its address and prepare the port for use.
    112   void SetPort(Port* port);
    113 
    114   // Called once we have a port and a remote address.  This will set mark the
    115   // channel as writable and signal the route to the client.
    116   void SetWritable();
    117 
    118   // Called when we receive a packet from the other client.
    119   void OnReadPacket(Port* port, const char* data, size_t size,
    120                     const talk_base::SocketAddress& addr);
    121 
    122   // Handles a message to destroy unused ports.
    123   virtual void OnMessage(talk_base::Message *msg);
    124 
    125   DISALLOW_EVIL_CONSTRUCTORS(RawTransportChannel);
    126 };
    127 
    128 }  // namespace cricket
    129 
    130 #endif  // defined(FEATURE_ENABLE_PSTN)
    131 #endif  // TALK_P2P_BASE_RAWTRANSPORTCHANNEL_H_
    132