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      1 /*
      2  * libjingle
      3  * Copyright 2004--2008, 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 __TUNNELSESSIONCLIENT_H__
     29 #define __TUNNELSESSIONCLIENT_H__
     30 
     31 #include <vector>
     32 
     33 #include "talk/base/criticalsection.h"
     34 #include "talk/base/stream.h"
     35 #include "talk/p2p/base/constants.h"
     36 #include "talk/p2p/base/pseudotcp.h"
     37 #include "talk/p2p/base/session.h"
     38 #include "talk/p2p/base/sessiondescription.h"
     39 #include "talk/p2p/base/sessionmanager.h"
     40 #include "talk/p2p/base/sessionclient.h"
     41 #include "talk/xmllite/qname.h"
     42 #include "talk/xmpp/constants.h"
     43 
     44 namespace cricket {
     45 
     46 class TunnelSession;
     47 class TunnelStream;
     48 
     49 enum TunnelSessionRole { INITIATOR, RESPONDER };
     50 
     51 ///////////////////////////////////////////////////////////////////////////////
     52 // TunnelSessionClient
     53 ///////////////////////////////////////////////////////////////////////////////
     54 
     55 // Base class is still abstract
     56 class TunnelSessionClientBase
     57   : public SessionClient, public talk_base::MessageHandler {
     58 public:
     59   TunnelSessionClientBase(const buzz::Jid& jid, SessionManager* manager,
     60                           const std::string &ns);
     61   virtual ~TunnelSessionClientBase();
     62 
     63   const buzz::Jid& jid() const { return jid_; }
     64   SessionManager* session_manager() const { return session_manager_; }
     65 
     66   void OnSessionCreate(Session* session, bool received);
     67   void OnSessionDestroy(Session* session);
     68 
     69   // This can be called on any thread.  The stream interface is
     70   // thread-safe, but notifications must be registered on the creating
     71   // thread.
     72   talk_base::StreamInterface* CreateTunnel(const buzz::Jid& to,
     73                                            const std::string& description);
     74 
     75   talk_base::StreamInterface* AcceptTunnel(Session* session);
     76   void DeclineTunnel(Session* session);
     77 
     78   // Invoked on an incoming tunnel
     79   virtual void OnIncomingTunnel(const buzz::Jid &jid, Session *session) = 0;
     80 
     81   // Invoked on an outgoing session request
     82   virtual SessionDescription* CreateOffer(
     83       const buzz::Jid &jid, const std::string &description) = 0;
     84   // Invoked on a session request accept to create
     85   // the local-side session description
     86   virtual SessionDescription* CreateAnswer(
     87       const SessionDescription* offer) = 0;
     88 
     89 protected:
     90 
     91   void OnMessage(talk_base::Message* pmsg);
     92 
     93   // helper method to instantiate TunnelSession. By overriding this,
     94   // subclasses of TunnelSessionClient are able to instantiate
     95   // subclasses of TunnelSession instead.
     96   virtual TunnelSession* MakeTunnelSession(Session* session,
     97                                            talk_base::Thread* stream_thread,
     98                                            TunnelSessionRole role);
     99 
    100   buzz::Jid jid_;
    101   SessionManager* session_manager_;
    102   std::vector<TunnelSession*> sessions_;
    103   std::string namespace_;
    104   bool shutdown_;
    105 };
    106 
    107 class TunnelSessionClient
    108   : public TunnelSessionClientBase, public sigslot::has_slots<>  {
    109 public:
    110   TunnelSessionClient(const buzz::Jid& jid, SessionManager* manager);
    111   TunnelSessionClient(const buzz::Jid& jid, SessionManager* manager,
    112                       const std::string &ns);
    113   virtual ~TunnelSessionClient();
    114 
    115   virtual bool ParseContent(SignalingProtocol protocol,
    116                             const buzz::XmlElement* elem,
    117                             ContentDescription** content,
    118                             ParseError* error);
    119   virtual bool WriteContent(SignalingProtocol protocol,
    120                             const ContentDescription* content,
    121                             buzz::XmlElement** elem,
    122                             WriteError* error);
    123 
    124   // Signal arguments are this, initiator, description, session
    125   sigslot::signal4<TunnelSessionClient*, buzz::Jid, std::string, Session*>
    126     SignalIncomingTunnel;
    127 
    128   virtual void OnIncomingTunnel(const buzz::Jid &jid,
    129                                 Session *session);
    130   virtual SessionDescription* CreateOffer(
    131       const buzz::Jid &jid, const std::string &description);
    132   virtual SessionDescription* CreateAnswer(
    133       const SessionDescription* offer);
    134 };
    135 
    136 ///////////////////////////////////////////////////////////////////////////////
    137 // TunnelSession
    138 // Note: The lifetime of TunnelSession is complicated.  It needs to survive
    139 // until the following three conditions are true:
    140 // 1) TunnelStream has called Close (tracked via non-null stream_)
    141 // 2) PseudoTcp has completed (tracked via non-null tcp_)
    142 // 3) Session has been destroyed (tracked via non-null session_)
    143 // This is accomplished by calling CheckDestroy after these indicators change.
    144 ///////////////////////////////////////////////////////////////////////////////
    145 ///////////////////////////////////////////////////////////////////////////////
    146 // TunnelStream
    147 // Note: Because TunnelStream provides a stream interface, its lifetime is
    148 // controlled by the owner of the stream pointer.  As a result, we must support
    149 // both the TunnelSession disappearing before TunnelStream, and vice versa.
    150 ///////////////////////////////////////////////////////////////////////////////
    151 
    152 class PseudoTcpChannel;
    153 
    154 class TunnelSession : public sigslot::has_slots<> {
    155  public:
    156   // Signalling thread methods
    157   TunnelSession(TunnelSessionClientBase* client, Session* session,
    158                 talk_base::Thread* stream_thread);
    159 
    160   virtual talk_base::StreamInterface* GetStream();
    161   bool HasSession(Session* session);
    162   Session* ReleaseSession(bool channel_exists);
    163 
    164  protected:
    165   virtual ~TunnelSession();
    166 
    167   virtual void OnSessionState(BaseSession* session, BaseSession::State state);
    168   virtual void OnInitiate();
    169   virtual void OnAccept();
    170   virtual void OnTerminate();
    171   virtual void OnChannelClosed(PseudoTcpChannel* channel);
    172 
    173   TunnelSessionClientBase* client_;
    174   Session* session_;
    175   PseudoTcpChannel* channel_;
    176 };
    177 
    178 ///////////////////////////////////////////////////////////////////////////////
    179 
    180 } // namespace cricket
    181 
    182 #endif // __TUNNELSESSIONCLIENT_H__
    183