resip/dum/Dialog.cxx

#include "resip/stack/Contents.hxx"
#include "resip/stack/Helper.hxx"
#include "resip/stack/SipMessage.hxx"
#include "resip/dum/AppDialog.hxx"
#include "resip/dum/BaseCreator.hxx"
#include "resip/dum/ClientAuthManager.hxx"
#include "resip/dum/ClientInviteSession.hxx"
#include "resip/dum/ClientSubscription.hxx"
#include "resip/dum/Dialog.hxx"
#include "resip/dum/DialogUsageManager.hxx"
#include "resip/dum/MasterProfile.hxx"
#include "resip/dum/InviteSessionCreator.hxx"
#include "resip/dum/InviteSessionHandler.hxx"
#include "resip/dum/ServerInviteSession.hxx"
#include "resip/dum/ServerSubscription.hxx"
#include "resip/dum/SubscriptionHandler.hxx"
#include "resip/dum/UsageUseException.hxx"
#include "rutil/Logger.hxx"
#include "rutil/Inserter.hxx"
#include "rutil/WinLeakCheck.hxx"

#define RESIPROCATE_SUBSYSTEM Subsystem::DUM

using namespace resip;
using namespace std;

Dialog::Dialog(DialogUsageManager& dum, const SipMessage& msg, DialogSet& ds)
   : mDum(dum),
     mDialogSet(ds),
     mId("INVALID", "INVALID", "INVALID"),
     mClientSubscriptions(),
     mServerSubscriptions(),
     mInviteSession(0),
     mType(Fake),
     mRouteSet(),
     mLocalContact(),
     mLocalCSeq(0),
     mRemoteCSeq(0),
     mRemoteTarget(),
     mLocalNameAddr(),
     mRemoteNameAddr(),
     mCallId(msg.header(h_CallID)),
     mDefaultSubExpiration(0),
     mAppDialog(0),
     mDestroying(false),
     mReUseDialogSet(false)
{
   assert(msg.isExternal());

   assert(msg.header(h_CSeq).method() != MESSAGE);
   assert(msg.header(h_CSeq).method() != REGISTER);
   assert(msg.header(h_CSeq).method() != PUBLISH);

   mNetworkAssociation.setDum(&dum);

   if (msg.isRequest()) // UAS
   {
      const SipMessage& request = msg;

      switch (request.header(h_CSeq).method())
      {
         case INVITE:
            mType = Invitation;
            break;

         case SUBSCRIBE:
         case REFER:
         case NOTIFY:
            //!dcm! -- event header check
            mType = Subscription;
            break;

         default:
            mType = Fake;
      }
      if (request.exists(h_RecordRoutes))
      {
         mRouteSet = request.header(h_RecordRoutes); 
      }

      switch (request.header(h_CSeq).method())
      {
         case INVITE:
         case SUBSCRIBE:
         case REFER:
         case NOTIFY:
            DebugLog ( << "UAS dialog ID creation, DS: " << ds.getId());
            mId = DialogId(ds.getId(), 
                           request.header(h_From).exists(p_tag) ? request.header(h_From).param(p_tag) : Data::Empty);            

            mRemoteNameAddr = request.header(h_From);
            mLocalNameAddr = request.header(h_To);
            mLocalNameAddr.param(p_tag) = mId.getLocalTag();
            if (request.exists(h_Contacts) && request.header(h_Contacts).size() == 1)
            {
               const NameAddr& contact = request.header(h_Contacts).front();
               if (isEqualNoCase(contact.uri().scheme(), Symbols::Sips) ||
                   isEqualNoCase(contact.uri().scheme(), Symbols::Sip))
               {
                  mLocalContact = NameAddr(request.header(h_RequestLine).uri()); // update later when send a request
                  mRemoteTarget = contact;
                  if (mDialogSet.getUserProfile()->hasOverrideHostAndPort())
                  {
                     mLocalContact.uri().host() = mDialogSet.getUserProfile()->getOverrideHostAndPort().host();
                     mLocalContact.uri().port() = mDialogSet.getUserProfile()->getOverrideHostAndPort().port();
                  }
               }
               else
               {
                  InfoLog(<< "Got an INVITE or SUBSCRIBE with invalid scheme");
                  InfoLog(<< request);
                  throw Exception("Invalid scheme in request", __FILE__, __LINE__);
               }
            }
            else
            {
               InfoLog (<< "Got an INVITE or SUBSCRIBE that doesn't have exactly one contact");
               InfoLog (<< request);
               throw Exception("Too many (or no contact) contacts in request", __FILE__, __LINE__);
            }
            break;
         default:
            break;
      }

      mRemoteCSeq = request.header(h_CSeq).sequence();
      mLocalCSeq = 1;

      DebugLog ( << "************** Created Dialog as UAS **************" );
      DebugLog ( << "mRemoteNameAddr: " << mRemoteNameAddr );
      DebugLog ( << "mLocalNameAddr: " << mLocalNameAddr );
      DebugLog ( << "mLocalContact: " << mLocalContact );
      DebugLog ( << "mRemoteTarget: " << mRemoteTarget );
   }
   else if (msg.isResponse())
   {
      mId = DialogId(msg);
      const SipMessage& response = msg;
      mRemoteNameAddr = response.header(h_To);
      mLocalNameAddr = response.header(h_From);

      switch (msg.header(h_CSeq).method())
      {
         case INVITE:
            mType = Invitation;
            break;

         case SUBSCRIBE:
         case REFER:
            mType = Subscription;
            break;

         default:
            mType = Fake;
      }

      if (response.exists(h_RecordRoutes))
      {
         mRouteSet = response.header(h_RecordRoutes).reverse();
      }

      switch (response.header(h_CSeq).method())
      {
         case INVITE:
         case SUBSCRIBE:
         case REFER:
            if (response.header(h_StatusLine).statusCode() > 100 &&
                response.header(h_StatusLine).statusCode() < 300)
            {

               if  (response.exists(h_Contacts) && response.header(h_Contacts).size() == 1)
               {
                  const NameAddr& contact = response.header(h_Contacts).front();
                  if (isEqualNoCase(contact.uri().scheme(), Symbols::Sips) ||
                     isEqualNoCase(contact.uri().scheme(), Symbols::Sip))
                  {
                     BaseCreator* creator = mDialogSet.getCreator();                                     

                     if( 0 == creator )
                     {
                        ErrLog(<< "BaseCreator is null for DialogSet");
                        ErrLog(<< response);
                        throw Exception("BaseCreator is null for DialogSet", __FILE__, __LINE__);
                     }

                     SharedPtr<SipMessage> lastRequest(creator->getLastRequest());

                     if( 0 == lastRequest.get() ||
                        !lastRequest->exists(h_Contacts) ||
                        lastRequest->header(h_Contacts).empty())
                     {
                        InfoLog(<< "lastRequest does not contain a valid contact");                                             
                        InfoLog(<< response);
                        throw Exception("lastRequest does not contain a valid contact.", __FILE__, __LINE__);
                     }
                     mLocalContact = creator->getLastRequest()->header(h_Contacts).front();
                     mRemoteTarget = contact;
                  }
                  else
                  {
                     InfoLog (<< "Got an INVITE or SUBSCRIBE with invalid scheme");
                     DebugLog (<< response);
                     throw Exception("Bad scheme in contact in response", __FILE__, __LINE__);
                  }
               }
               else
               {
                  InfoLog (<< "Got an INVITE or SUBSCRIBE that doesn't have exactly one contact");
                  DebugLog (<< response);
                  throw Exception("Too many contacts (or no contact) in response", __FILE__, __LINE__);
               }
               break;
               default:
                  break;
            }
      }

      mLocalCSeq = response.header(h_CSeq).sequence();
      mRemoteCSeq = 0;
      DebugLog ( << "************** Created Dialog as UAC **************" );
      DebugLog ( << "mRemoteNameAddr: " << mRemoteNameAddr );
      DebugLog ( << "mLocalNameAddr: " << mLocalNameAddr );
      DebugLog ( << "mLocalContact: " << mLocalContact );
      DebugLog ( << "mRemoteTarget: " << mRemoteTarget );
   }
   mDialogSet.addDialog(this);
   DebugLog ( <<"Dialog::Dialog " << mId);
}

Dialog::~Dialog()
{
   DebugLog ( <<"Dialog::~Dialog() ");

   mDestroying = true;

   while (!mClientSubscriptions.empty())
   {
      delete *mClientSubscriptions.begin();
   }

   while (!mServerSubscriptions.empty())
   {
      delete *mServerSubscriptions.begin();
   }

   delete mInviteSession;
   mDialogSet.mDialogs.erase(this->getId());
   delete mAppDialog;
   if(!mReUseDialogSet)
   {
      mDialogSet.possiblyDie();
   }
}

const DialogId&
Dialog::getId() const
{
   return mId;
}

void
Dialog::cancel()
{
   assert(mType == Invitation);
   ClientInviteSession* uac = dynamic_cast<ClientInviteSession*>(mInviteSession);
   assert (uac);
   uac->cancel();
}

void
Dialog::end()
{
   if (mInviteSession)
   {
      mInviteSession->end();
   }

   // End Subscriptions
   for (list<ClientSubscription*>::iterator it = mClientSubscriptions.begin();
        it != mClientSubscriptions.end(); it++)
   {
      (*it)->end();
   }

   for (list<ServerSubscription*>::iterator it2 = mServerSubscriptions.begin();
        it2 != mServerSubscriptions.end(); it2++)
   {
      (*it2)->end();
   }
}

void
Dialog::handleTargetRefresh(const SipMessage& msg)
{
   switch(msg.header(h_CSeq).method())
   {
      case INVITE:
      case UPDATE:
         if (msg.isRequest() || (msg.isResponse() && msg.header(h_StatusLine).statusCode()/100 == 2))
         {
            //?dcm? modify local target; 12.2.2 of 3261 implies that the remote
            //target is immediately modified.  Should we wait until a 2xx class
            //reponse is sent to a re-invite(easy when all send requests go
            //through Dialog)
            if (msg.exists(h_Contacts))
            {
               //.dcm. replace or check then replace
               mRemoteTarget = msg.header(h_Contacts).front();
            }
         }
         break;
      default:
         return;
   }
}

void
Dialog::dispatch(const SipMessage& msg)
{
   // !jf! Should be checking for messages with out of order CSeq and rejecting

   DebugLog ( << "Dialog::dispatch: " << msg.brief());

   if(msg.isExternal())
   {
      const Data& receivedTransport = msg.header(h_Vias).front().transport();
      int keepAliveTime = 0;
      if(receivedTransport == Symbols::TCP ||
         receivedTransport == Symbols::TLS ||
         receivedTransport == Symbols::SCTP)
      {
         keepAliveTime = mDialogSet.getUserProfile()->getKeepAliveTimeForStream();
      }
      else
      {
         keepAliveTime = mDialogSet.getUserProfile()->getKeepAliveTimeForDatagram();
      }

      if(keepAliveTime > 0)
      {
         mNetworkAssociation.update(msg, keepAliveTime);
      }
   }
   
   handleTargetRefresh(msg);
   if (msg.isRequest())
   {
      const SipMessage& request = msg;
      switch (request.header(h_CSeq).method())
      {
         case INVITE:  // new INVITE
            if (mInviteSession == 0)
            {
               DebugLog ( << "Dialog::dispatch  --  Created new server invite session" << msg.brief());
               mInviteSession = makeServerInviteSession(request);
            }
            mInviteSession->dispatch(request);
            break;
            //refactor, send bad request for BYE, INFO, CANCEL?
         case BYE:
            if (mInviteSession == 0)
            {
               InfoLog ( << "Spurious BYE" );
               return;
            }
            else
            {
               mInviteSession->dispatch(request);
            }
            break;
         case UPDATE:
            if (mInviteSession == 0)
            {
               InfoLog ( << "Spurious UPDATE" );
               return;
            }
            else
            {
               mInviteSession->dispatch(request);
            }
            break;
         case INFO:
            if (mInviteSession == 0)
            {
               InfoLog ( << "Spurious INFO" );
               return;
            }
            else
            {
               mInviteSession->dispatch(request);
            }
            break;
         case MESSAGE:
            if (mInviteSession == 0)
            {
               InfoLog ( << "Spurious MESSAGE" );
               return;
            }
            else
            {
               mInviteSession->dispatch(request);
            }
            break;
         case ACK:
         case CANCEL:
            if (mInviteSession == 0)
            {
               InfoLog (<< "Drop stray ACK or CANCEL in dialog on the floor");
               DebugLog (<< request);
            }
            else
            {
               mInviteSession->dispatch(request);
            }
            break;
         case SUBSCRIBE:
         {
            ServerSubscription* server = findMatchingServerSub(request);
            if (server)
            {
               server->dispatch(request);
            }
            else
            {
               if (request.exists(h_Event) && request.header(h_Event).value() == "refer")
               {
                  InfoLog (<< "Received a subscribe to a non-existent refer subscription: " << request.brief());
                  SipMessage failure;
                  makeResponse(failure, request, 403);
                  mDum.sendResponse(failure);
                  return;
               }
               else
               {
                  if (mDum.checkEventPackage(request))
                  {
                     server = makeServerSubscription(request);
                     mServerSubscriptions.push_back(server);
                     server->dispatch(request);
                  }
               }
            }
         }
         break;
         case REFER:
         {
//             if (mInviteSession == 0)
//             {
//                InfoLog (<< "Received an in dialog refer in a non-invite dialog: " << request.brief());
//                SipMessage failure;
//                makeResponse(failure, request, 603);
//                mDum.sendResponse(failure);
//                return;
//             }
//             else 

            if  (!request.exists(h_ReferTo))
            {
               InfoLog (<< "Received refer w/out a Refer-To: " << request.brief());
               SipMessage failure;
               makeResponse(failure, request, 400);
               mDum.sendResponse(failure);
               return;
            }
            else
            {
               if (request.exists(h_ReferSub) && request.header(h_ReferSub).value()=="false")
               {
                  assert(mInviteSession);
                  mInviteSession->referNoSub(msg);
               }
               else
               {
                  ServerSubscription* server = findMatchingServerSub(request);
                  ServerSubscriptionHandle serverHandle;
                  if (server)
                  {
                     serverHandle = server->getHandle();
                     server->dispatch(request);
                  }
                  else
                  {
                     server = makeServerSubscription(request);
                     mServerSubscriptions.push_back(server);
                     serverHandle = server->getHandle();
                     server->dispatch(request);
                  }

                  if (mInviteSession)
                  {
                     mDum.mInviteSessionHandler->onRefer(mInviteSession->getSessionHandle(), serverHandle, msg);
                  }
                  
               }
            }
         }
         break;
         case NOTIFY:
            {
               ClientSubscription* client = findMatchingClientSub(request);
               if (client)
               {
                  client->dispatch(request);
               }
               else
               {
                  BaseCreator* creator = mDialogSet.getCreator();
                  if (creator && (creator->getLastRequest()->header(h_RequestLine).method() == SUBSCRIBE ||
                     creator->getLastRequest()->header(h_RequestLine).method() == REFER))  
                  {
                     DebugLog (<< "Making subscription (from creator) request: " << *creator->getLastRequest());
                     ClientSubscription* sub = makeClientSubscription(*creator->getLastRequest());
                     mClientSubscriptions.push_back(sub);
                     sub->dispatch(request);
                  }
                  else
                  {
                     if (mInviteSession != 0 && (!msg.exists(h_Event) || msg.header(h_Event).value() == "refer") && 
                         mDum.getClientSubscriptionHandler("refer")!=0) 
                     {
                        DebugLog (<< "Making subscription from NOTIFY: " << msg);
                        ClientSubscription* sub = makeClientSubscription(msg);
                        mClientSubscriptions.push_back(sub);
                        ClientSubscriptionHandle client = sub->getHandle();
                        mDum.mInviteSessionHandler->onReferAccepted(mInviteSession->getSessionHandle(), client, msg);                                 
                        mInviteSession->mSentRefer = false;
                        sub->dispatch(request);
                     }
                     else
                     {
                        SharedPtr<SipMessage> response(new SipMessage);
                        makeResponse(*response, msg, 406);
                        send(response);
                     }
                  }
               }
            }
            break;
        default:
           assert(0);
           return;
      }
   }
   else if (msg.isResponse())
   {
      // !jf! There is a substantial change in how this works in teltel-branch
      // from how it worked in main branch pre merge.
      // If the response doesn't match a cseq for a request I've sent, ignore
      // the response
      RequestMap::iterator r = mRequests.find(msg.header(h_CSeq).sequence());
      if (r != mRequests.end())
      {
         bool handledByAuth = false;
         if (mDum.mClientAuthManager.get() && 
             mDum.mClientAuthManager->handle(*mDialogSet.getUserProfile(), *r->second, msg))
         {
            InfoLog( << "about to re-send request with digest credentials" << r->second->brief());

            assert (r->second->isRequest());

            mLocalCSeq++;
            send(r->second);
            handledByAuth = true;
         }
         mRequests.erase(r);
         if (handledByAuth) return;
      }
      
      const SipMessage& response = msg;
      int code = response.header(h_StatusLine).statusCode();
      // If this is a 200 response to the initial request, then store the routeset (if present)
      BaseCreator* creator = mDialogSet.getCreator();
      if (creator && (creator->getLastRequest()->header(h_CSeq) == response.header(h_CSeq)) && code >=200 && code < 300)
      {
         if (response.exists(h_RecordRoutes))
         {
            mRouteSet = response.header(h_RecordRoutes).reverse();
         }
         else
         {
            // Ensure that if the route-set in the 200 is empty, then we overwrite any existing route-sets
            mRouteSet.clear();
         }
      }

      // !jf! should this only be for 2xx responses? !jf! Propose no as an
      // answer !dcm! what is he on?
      switch (response.header(h_CSeq).method())
      {
         case INVITE:
            if (mInviteSession == 0)
            {
               DebugLog ( << "Dialog::dispatch  --  Created new client invite session" << msg.brief());

               mInviteSession = makeClientInviteSession(response);
               mInviteSession->dispatch(response);
            }
            else
            {
               mInviteSession->dispatch(response);
            }
            break;
         case BYE:
         case ACK:
         case CANCEL:
         case INFO:
         case MESSAGE:
         case UPDATE:
            if (mInviteSession)
            {
               mInviteSession->dispatch(response);
            }
            // else drop on the floor
            break;       

                 case REFER:
            if(mInviteSession)
            {
               mInviteSession->mSentRefer = false;

               if (code >= 300)
               {
                  mDum.mInviteSessionHandler->onReferRejected(mInviteSession->getSessionHandle(), msg);
               }
               else
               {
                  //!dys! the OR condition below is not draft compliant.
                  if (!mInviteSession->mReferSub && 
                      ((msg.exists(h_ReferSub) && msg.header(h_ReferSub).value()=="false") || 
                       !msg.exists(h_ReferSub)))
                  {
                     DebugLog(<< "refer accepted with norefersub");
                     mDum.mInviteSessionHandler->onReferAccepted(mInviteSession->getSessionHandle(), ClientSubscriptionHandle::NotValid(), msg);
                  }
                  // else no need for action - first Notify will cause onReferAccepted to be called
               }
               break;
            }
            // fall through, out of dialog refer was sent.

         case SUBSCRIBE:
         {
            int code = response.header(h_StatusLine).statusCode();
            ClientSubscription* client = findMatchingClientSub(response);
            if (client)
            {
               client->dispatch(response);
            }
            else if (code < 300)
            {
               /*
                  we're capturing the  value from the expires header off
                  the 2xx because the ClientSubscription is only created
                  after receiving the NOTIFY that comes (usually) after
                  this 2xx.  We really should be creating the
                  ClientSubscription at either the 2xx or the NOTIFY
                  whichever arrives first. .mjf.
                  Note: we're capturing a duration here (not the
                  absolute time because all the inputs to
                  ClientSubscription desling with the expiration are expecting
                  duration type values from the headers. .mjf.
                */
               mDefaultSubExpiration = response.header(h_Expires).value();
               return;
            }
            else
            {
               //!dcm! -- can't subscribe in an existing Dialog, this is all
               //a bit of a hack; currently, spurious failure messages may cause callbacks
               BaseCreator* creator = mDialogSet.getCreator();
               if (!creator || !creator->getLastRequest()->exists(h_Event))
               {
                  return;
               }
               else
               {
                  ClientSubscriptionHandler* handler =
                     mDum.getClientSubscriptionHandler(creator->getLastRequest()->header(h_Event).value());
                  if (handler)
                  {
                     ClientSubscription* sub = makeClientSubscription(*creator->getLastRequest());
                     mClientSubscriptions.push_back(sub);
                     sub->dispatch(response);
                  }
               }
            }

         }
         break;
         case NOTIFY:
         {
            //2xx responses are treated as retransmission quenchers(handled by
            //the stack). Failures are dispatched to all ServerSubsscriptions,
            //which may not be correct.

            int code = msg.header(h_StatusLine).statusCode();
            if (code >= 300)
            {
               //!dcm! -- ick, write guard
               mDestroying = true;
               for (list<ServerSubscription*>::iterator it = mServerSubscriptions.begin();
                    it != mServerSubscriptions.end(); )
               {
                  ServerSubscription* s = *it;
                  it++;
                  s->dispatch(msg);
               }
               mDestroying = false;
               possiblyDie();
            }
//             ServerSubscription* server = findMatchingServerSub(response);
//             if (server)
//             {
//                server->dispatch(response);
//             }
         }
         break;
         default:
            assert(0);
            return;
      }

#if 0     // merged from head back to teltel-branch
      if (msg.header(h_StatusLine).statusCode() >= 400
          && Helper::determineFailureMessageEffect(msg) == Helper::DialogTermination)
      {
         //kill all usages
         mDestroying = true;

         for (list<ServerSubscription*>::iterator it = mServerSubscriptions.begin();
              it != mServerSubscriptions.end(); )
         {
            ServerSubscription* s = *it;
            it++;
            s->dialogDestroyed(msg);
         }

         for (list<ClientSubscription*>::iterator it = mClientSubscriptions.begin();
              it != mClientSubscriptions.end(); )
         {
            ClientSubscription* s = *it;
            it++;
            s->dialogDestroyed(msg);
         }
         if (mInviteSession)
         {
            mInviteSession->dialogDestroyed(msg);
         }
         mDestroying = false;
         possiblyDie(); //should aways result in destruction of this
         return;
      }
#endif
   }
}

ServerSubscription*
Dialog::findMatchingServerSub(const SipMessage& msg)
{
   for (std::list<ServerSubscription*>::iterator i=mServerSubscriptions.begin();
        i != mServerSubscriptions.end(); ++i)
   {
      if ((*i)->matches(msg))
      {
         return *i;
      }
   }
   return 0;
}

ClientSubscription*
Dialog::findMatchingClientSub(const SipMessage& msg)
{
   for (std::list<ClientSubscription*>::iterator i=mClientSubscriptions.begin();
        i != mClientSubscriptions.end(); ++i)
   {
      if ((*i)->matches(msg))
      {
         return *i;
      }
   }
   return 0;
}

InviteSessionHandle
Dialog::getInviteSession()
{
   if (mInviteSession)
   {
      return mInviteSession->getSessionHandle();
   }
   else
   {
      return InviteSessionHandle::NotValid();
   }
}

std::vector<ClientSubscriptionHandle>
Dialog::findClientSubscriptions(const Data& event)
{
   std::vector<ClientSubscriptionHandle> handles;

   for (std::list<ClientSubscription*>::const_iterator i = mClientSubscriptions.begin();
        i != mClientSubscriptions.end(); ++i)
   {
      if ( (*i)->getEventType() == event)
      {
         handles.push_back((*i)->getHandle());
      }
   }
   return handles;
}

std::vector<ServerSubscriptionHandle>
Dialog::findServerSubscriptions(const Data& event)
{
   std::vector<ServerSubscriptionHandle> handles;

   for (std::list<ServerSubscription*>::const_iterator i = mServerSubscriptions.begin();
        i != mServerSubscriptions.end(); ++i)
   {
      if ( (*i)->getEventType() == event)
      {
         handles.push_back((*i)->getHandle());
      }
   }
   return handles;
}

std::vector<ClientSubscriptionHandle>
Dialog::getClientSubscriptions()
{
   std::vector<ClientSubscriptionHandle> handles;

   for (std::list<ClientSubscription*>::const_iterator i = mClientSubscriptions.begin();
        i != mClientSubscriptions.end(); ++i)
   {
      handles.push_back((*i)->getHandle());
   }

   return handles;
}

std::vector<ServerSubscriptionHandle>
Dialog::getServerSubscriptions()
{
   std::vector<ServerSubscriptionHandle> handles;

   for (std::list<ServerSubscription*>::const_iterator i = mServerSubscriptions.begin();
        i != mServerSubscriptions.end(); ++i)
   {
      handles.push_back((*i)->getHandle());
   }

   return handles;
}

void
Dialog::redirected(const SipMessage& msg)
{
   //Established dialogs are not destroyed by a redirect
   if (!mClientSubscriptions.empty() || !mServerSubscriptions.empty())
   {
      return;
   }
   if (mInviteSession)
   {
      ClientInviteSession* cInv = dynamic_cast<ClientInviteSession*>(mInviteSession);
      if (cInv)
      {
         cInv->handleRedirect(msg);
         mReUseDialogSet = true;  // Set flag so that DialogSet will not be destroyed and new Request can use it
      }
   }
}

void
Dialog::makeRequest(SipMessage& request, MethodTypes method)
{
   RequestLine rLine(method);

   rLine.uri() = mRemoteTarget.uri();

   request.header(h_RequestLine) = rLine;
   request.header(h_To) = mRemoteNameAddr;
//   request.header(h_To).param(p_tag) = mId.getRemoteTag();
   request.header(h_From) = mLocalNameAddr;
//   request.header(h_From).param(p_tag) = mId.getLocalTag();

   request.header(h_CallId) = mCallId;

   request.remove(h_RecordRoutes);  //!dcm! -- all of this is rather messy
   request.remove(h_Replaces);

   request.remove(h_Contacts);
   request.header(h_Contacts).push_front(mLocalContact);

   request.header(h_CSeq).method() = method;
   request.header(h_MaxForwards).value() = 70;

   //must keep old via for cancel
   if (method != CANCEL)
   {
      request.header(h_Routes) = mRouteSet;
      request.remove(h_Vias);
      Via via;
      via.param(p_branch); // will create the branch
      request.header(h_Vias).push_front(via);
   }
   else
   {
      assert(request.exists(h_Vias));
   }

   //don't increment CSeq for ACK or CANCEL
   if (method != ACK && method != CANCEL)
   {
      request.header(h_CSeq).sequence() = ++mLocalCSeq;
   }
   else
   {
      // ACK and cancel have a minimal header set
      request.remove(h_Accepts);
      request.remove(h_AcceptEncodings);
      request.remove(h_AcceptLanguages);
      request.remove(h_Allows);
      request.remove(h_Requires);
      request.remove(h_ProxyRequires);
      request.remove(h_Supporteds);
      // request.header(h_CSeq).sequence() = ?;  // Caller should provide original request, or modify CSeq to proper value after calling this method
   }

   // If method is INVITE then advertise required headers
   if(method == INVITE || method == UPDATE)
   {
      if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::Allow)) request.header(h_Allows) = mDum.getMasterProfile()->getAllowedMethods();
      if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::AcceptEncoding)) request.header(h_AcceptEncodings) = mDum.getMasterProfile()->getSupportedEncodings();
      if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::AcceptLanguage)) request.header(h_AcceptLanguages) = mDum.getMasterProfile()->getSupportedLanguages();
      if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::AllowEvents)) request.header(h_AllowEvents) = mDum.getMasterProfile()->getAllowedEvents();
      if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::Supported)) request.header(h_Supporteds) = mDum.getMasterProfile()->getSupportedOptionTags();
   }

   if (mDialogSet.mUserProfile->isAnonymous())
   {
      request.header(h_Privacys).push_back(Token(Symbols::id));
   }

   DebugLog ( << "Dialog::makeRequest: " << std::endl << std::endl << request );
}


void
Dialog::makeResponse(SipMessage& response, const SipMessage& request, int code)
{
   assert( code >= 100 );
   response.remove(h_Contacts);
   if (code < 300 && code > 100)
   {
      assert(request.isRequest());
      assert(request.header(h_RequestLine).getMethod() == INVITE ||
             request.header(h_RequestLine).getMethod() == SUBSCRIBE ||
             request.header(h_RequestLine).getMethod() == BYE ||
             request.header(h_RequestLine).getMethod() == CANCEL ||
             request.header(h_RequestLine).getMethod() == REFER ||
             request.header(h_RequestLine).getMethod() == MESSAGE ||
             request.header(h_RequestLine).getMethod() == NOTIFY ||
             request.header(h_RequestLine).getMethod() == INFO ||
             request.header(h_RequestLine).getMethod() == OPTIONS ||
             request.header(h_RequestLine).getMethod() == UPDATE
             );

//      assert (request.header(h_RequestLine).getMethod() == CANCEL ||  // Contact header is not required for Requests that do not form a dialog
//                    request.header(h_RequestLine).getMethod() == BYE ||
//                    request.header(h_Contacts).size() == 1);
      Helper::makeResponse(response, request, code, mLocalContact);
      response.header(h_To).param(p_tag) = mId.getLocalTag();

      if((request.header(h_RequestLine).getMethod() == INVITE ||
          request.header(h_RequestLine).getMethod() == UPDATE)
         && code >= 200 && code < 300)
      {
         // Check if we should add our capabilites to the invite success response
         if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::Allow)) 
         {
            response.header(h_Allows) = mDum.getMasterProfile()->getAllowedMethods();
         }
         if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::AcceptEncoding)) 
         {
            response.header(h_AcceptEncodings) = mDum.getMasterProfile()->getSupportedEncodings();
         }
         if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::AcceptLanguage)) 
         {
            response.header(h_AcceptLanguages) = mDum.getMasterProfile()->getSupportedLanguages();
         }
         if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::AllowEvents)) 
         {
            response.header(h_AllowEvents) = mDum.getMasterProfile()->getAllowedEvents();
         }
         if(mDialogSet.getUserProfile()->isAdvertisedCapability(Headers::Supported)) 
         {
            response.header(h_Supporteds) = mDum.getMasterProfile()->getSupportedOptionTags();
         }
      }
   }
   else
   {
      Helper::makeResponse(response, request, code);
      response.header(h_To).param(p_tag) = mId.getLocalTag();
   }

   DebugLog ( << "Dialog::makeResponse: " << std::endl << std::endl << response);
}


ClientInviteSession*
Dialog::makeClientInviteSession(const SipMessage& response)
{
   InviteSessionCreator* creator = dynamic_cast<InviteSessionCreator*>(mDialogSet.getCreator());
   assert(creator); // !jf! this maybe can assert by evil UAS
   //return mDum.createAppClientInviteSession(*this, *creator);
   return new ClientInviteSession(mDum, *this, creator->getLastRequest(),
                                  creator->getInitialOffer(), creator->getEncryptionLevel(), creator->getServerSubscription());
}


ClientSubscription*
Dialog::makeClientSubscription(const SipMessage& request)
{
   return new ClientSubscription(mDum, *this, request, mDefaultSubExpiration);
}


ServerInviteSession*
Dialog::makeServerInviteSession(const SipMessage& request)
{
   return new ServerInviteSession(mDum, *this, request);
}

ServerSubscription*
Dialog::makeServerSubscription(const SipMessage& request)
{
   return new ServerSubscription(mDum, *this, request);
}

Dialog::Exception::Exception(const Data& msg, const Data& file, int line)
   : BaseException(msg, file, line)
{
}


void
Dialog::send(SharedPtr<SipMessage> msg)
{
   if (msg->isRequest() && msg->header(h_CSeq).method() != ACK)
   {
      mRequests[msg->header(h_CSeq).sequence()] = msg;
   }
   mDum.send(msg);
}

void
Dialog::onForkAccepted()
{
   ClientInviteSession* uac = dynamic_cast<ClientInviteSession*>(mInviteSession);
   if (uac)
   {
      uac->onForkAccepted();
   }
}

void Dialog::possiblyDie()
{
   // !slg! Note:  dialogs should really stick around for 32s, in order to ensure that all 2xx retransmissions get Ack'd, then BYE'd correctly
   if (!mDestroying)
   {
      if (mClientSubscriptions.empty() &&
          mServerSubscriptions.empty() &&
          !mInviteSession)
      {
         mDestroying = true;
         mDum.destroy(this);
      }
   }
}

ostream&
resip::operator<<(ostream& strm, const Dialog& dialog)
{
   strm
      << "mClientSubscriptions("
      << dialog.mClientSubscriptions.size()
      << "), "
      << "mServerSubscriptions("
      << dialog.mServerSubscriptions.size()
      << ")";
   return strm;
}


/* ====================================================================
 * The Vovida Software License, Version 1.0
 *
 * Copyright (c) 2000 Vovida Networks, Inc.  All rights reserved.
 *
 * 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 names "VOCAL", "Vovida Open Communication Application Library",
 *    and "Vovida Open Communication Application Library (VOCAL)" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact vocal@vovida.org.
 *
 * 4. Products derived from this software may not be called "VOCAL", nor
 *    may "VOCAL" appear in their name, without prior written
 *    permission of Vovida Networks, Inc.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL VOVIDA
 * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
 * IN EXCESS OF $1,000, NOR FOR ANY 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.
 *
 * ====================================================================
 *
 * This software consists of voluntary contributions made by Vovida
 * Networks, Inc. and many individuals on behalf of Vovida Networks,
 * Inc.  For more information on Vovida Networks, Inc., please see
 * <http://www.vovida.org/>.
 *
 */


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