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diff --git a/talk/session/tunnel/tunnelsessionclient.h b/talk/session/tunnel/tunnelsessionclient.h
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+++ b/talk/session/tunnel/tunnelsessionclient.h
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+/*
+ * libjingle
+ * Copyright 2004--2008, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __TUNNELSESSIONCLIENT_H__
+#define __TUNNELSESSIONCLIENT_H__
+
+#include <vector>
+
+#include "webrtc/p2p/base/constants.h"
+#include "webrtc/p2p/base/pseudotcp.h"
+#include "webrtc/p2p/base/session.h"
+#include "webrtc/p2p/base/sessionclient.h"
+#include "webrtc/p2p/base/sessiondescription.h"
+#include "webrtc/p2p/base/sessionmanager.h"
+#include "webrtc/libjingle/xmllite/qname.h"
+#include "webrtc/libjingle/xmpp/constants.h"
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/base/stream.h"
+
+namespace cricket {
+
+class TunnelSession;
+class TunnelStream;
+
+enum TunnelSessionRole { INITIATOR, RESPONDER };
+
+///////////////////////////////////////////////////////////////////////////////
+// TunnelSessionClient
+///////////////////////////////////////////////////////////////////////////////
+
+// Base class is still abstract
+class TunnelSessionClientBase
+  : public SessionClient, public rtc::MessageHandler {
+public:
+  TunnelSessionClientBase(const buzz::Jid& jid, SessionManager* manager,
+                          const std::string &ns);
+  virtual ~TunnelSessionClientBase();
+
+  const buzz::Jid& jid() const { return jid_; }
+  SessionManager* session_manager() const { return session_manager_; }
+
+  void OnSessionCreate(Session* session, bool received);
+  void OnSessionDestroy(Session* session);
+
+  // This can be called on any thread.  The stream interface is
+  // thread-safe, but notifications must be registered on the creating
+  // thread.
+  rtc::StreamInterface* CreateTunnel(const buzz::Jid& to,
+                                           const std::string& description);
+
+  rtc::StreamInterface* AcceptTunnel(Session* session);
+  void DeclineTunnel(Session* session);
+
+  // Invoked on an incoming tunnel
+  virtual void OnIncomingTunnel(const buzz::Jid &jid, Session *session) = 0;
+
+  // Invoked on an outgoing session request
+  virtual SessionDescription* CreateOffer(
+      const buzz::Jid &jid, const std::string &description) = 0;
+  // Invoked on a session request accept to create
+  // the local-side session description
+  virtual SessionDescription* CreateAnswer(
+      const SessionDescription* offer) = 0;
+
+protected:
+
+  void OnMessage(rtc::Message* pmsg);
+
+  // helper method to instantiate TunnelSession. By overriding this,
+  // subclasses of TunnelSessionClient are able to instantiate
+  // subclasses of TunnelSession instead.
+  virtual TunnelSession* MakeTunnelSession(Session* session,
+                                           rtc::Thread* stream_thread,
+                                           TunnelSessionRole role);
+
+  buzz::Jid jid_;
+  SessionManager* session_manager_;
+  std::vector<TunnelSession*> sessions_;
+  std::string namespace_;
+  bool shutdown_;
+};
+
+class TunnelSessionClient
+  : public TunnelSessionClientBase, public sigslot::has_slots<>  {
+public:
+  TunnelSessionClient(const buzz::Jid& jid, SessionManager* manager);
+  TunnelSessionClient(const buzz::Jid& jid, SessionManager* manager,
+                      const std::string &ns);
+  virtual ~TunnelSessionClient();
+
+  virtual bool ParseContent(SignalingProtocol protocol,
+                            const buzz::XmlElement* elem,
+                            ContentDescription** content,
+                            ParseError* error);
+  virtual bool WriteContent(SignalingProtocol protocol,
+                            const ContentDescription* content,
+                            buzz::XmlElement** elem,
+                            WriteError* error);
+
+  // Signal arguments are this, initiator, description, session
+  sigslot::signal4<TunnelSessionClient*, buzz::Jid, std::string, Session*>
+    SignalIncomingTunnel;
+
+  virtual void OnIncomingTunnel(const buzz::Jid &jid,
+                                Session *session);
+  virtual SessionDescription* CreateOffer(
+      const buzz::Jid &jid, const std::string &description);
+  virtual SessionDescription* CreateAnswer(
+      const SessionDescription* offer);
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// TunnelSession
+// Note: The lifetime of TunnelSession is complicated.  It needs to survive
+// until the following three conditions are true:
+// 1) TunnelStream has called Close (tracked via non-null stream_)
+// 2) PseudoTcp has completed (tracked via non-null tcp_)
+// 3) Session has been destroyed (tracked via non-null session_)
+// This is accomplished by calling CheckDestroy after these indicators change.
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+// TunnelStream
+// Note: Because TunnelStream provides a stream interface, its lifetime is
+// controlled by the owner of the stream pointer.  As a result, we must support
+// both the TunnelSession disappearing before TunnelStream, and vice versa.
+///////////////////////////////////////////////////////////////////////////////
+
+class PseudoTcpChannel;
+
+class TunnelSession : public sigslot::has_slots<> {
+ public:
+  // Signalling thread methods
+  TunnelSession(TunnelSessionClientBase* client, Session* session,
+                rtc::Thread* stream_thread);
+
+  virtual rtc::StreamInterface* GetStream();
+  bool HasSession(Session* session);
+  Session* ReleaseSession(bool channel_exists);
+
+ protected:
+  virtual ~TunnelSession();
+
+  virtual void OnSessionState(BaseSession* session, BaseSession::State state);
+  virtual void OnInitiate();
+  virtual void OnAccept();
+  virtual void OnTerminate();
+  virtual void OnChannelClosed(PseudoTcpChannel* channel);
+
+  TunnelSessionClientBase* client_;
+  Session* session_;
+  PseudoTcpChannel* channel_;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+} // namespace cricket
+
+#endif // __TUNNELSESSIONCLIENT_H__