internal TSIP_Dialog CreateDialog(TSIP_Dialog.tsip_dialog_type_t type, TSip_Session sipSession)
{
TSIP_Dialog dialog = null;
switch (type)
{
case TSIP_Dialog.tsip_dialog_type_t.REGISTER:
{
dialog = new TSIP_DialogRegister(sipSession as TSIP_SessionRegister);
break;
}
default:
{
TSK_Debug.Error("{0} not support as dialog type", type);
break;
}
}
if (dialog != null && !mDialogs.ContainsKey(dialog.Id))
{
mMutex.WaitOne();
mDialogs.Add(dialog.Id, dialog);
mMutex.ReleaseMutex();
}
return(dialog);
}
internal TSIP_Dialog FindDialogBySessionId(Int64 sessionId)
{
TSIP_Dialog dialog = null;
mMutex.WaitOne();
mMutex.ReleaseMutex();
return(dialog);
}
private void AddDialog(TSIP_Dialog dialog)
{
if (dialog != null)
{
mMutex.WaitOne();
mDialogs.Add(dialog.Id, dialog);
mMutex.ReleaseMutex();
}
}
internal TSIP_Dialog FindDialogById(Int64 dialogId)
{
TSIP_Dialog dialog = null;
mMutex.WaitOne();
if (mDialogs.ContainsKey(dialogId))
{
dialog = mDialogs[dialogId];
}
mMutex.ReleaseMutex();
return(dialog);
}
private TSIP_Dialog FindDialog(String callid, String to_tag, String from_tag, TSIP_Message.tsip_request_type_t type, out Boolean cid_matched)
{
TSIP_Dialog dialog = null;
cid_matched = false;
mMutex.WaitOne();
foreach (TSIP_Dialog d in mDialogs.Values)
{
if (String.Equals(d.CallId, callid))
{
Boolean is_cancel = (type == TSIP_Message.tsip_request_type_t.CANCEL); // Incoming CANCEL
Boolean is_register = (type == TSIP_Message.tsip_request_type_t.REGISTER); // Incoming REGISTER
Boolean is_notify = (type == TSIP_Message.tsip_request_type_t.NOTIFY); // Incoming NOTIFY
cid_matched = true;
/* CANCEL Request will have the same local tag than the INVITE request -> do not compare tags */
if ((is_cancel || String.Equals(d.TagLocal, from_tag)) && String.Equals(d.TagRemote, to_tag))
{
dialog = d;
break;
}
/* REGISTER is dialogless which means that each reREGISTER or unREGISTER will have empty to tag */
if (is_register /* Do not check tags */)
{
dialog = d;
break;
}
/* NOTIFY could arrive before the 200 SUBSCRIBE => This is why we don't try to match both tags
*
* RFC 3265 - 3.1.4.4. Confirmation of Subscription Creation
* Due to the potential for both out-of-order messages and forking, the
* subscriber MUST be prepared to receive NOTIFY messages before the
* SUBSCRIBE transaction has completed.
*/
if (is_notify /* Do not check tags */)
{
dialog = d;
break;
}
}
}
mMutex.ReleaseMutex();
return(dialog);
}
// this function is only called if no transaction match
// for responses, the transaction will always match
internal Boolean HandleIncomingMessage(TSIP_Message message)
{
TSIP_Dialog dialog = null;
TSIP_Transac transac = null;
Boolean cid_matched;
Boolean ret = false;
dialog = this.FindDialog(message.CallId.Value,
message.IsResponse ? message.To.Tag : message.From.Tag,
message.IsResponse ? message.From.Tag : message.To.Tag,
message.IsRequest ? (message as TSIP_Request).RequestType : TSIP_Message.tsip_request_type_t.NONE,
out cid_matched);
if (dialog != null)
{
if (message.IsCANCEL || message.IsACK)
{
ret = dialog.RaiseCallback(TSIP_Dialog.tsip_dialog_event_type_t.I_MSG, message);
goto bail;
}
else
{
transac = mStack.LayerTransac.CreateTransac(false, message, dialog);
}
}
else
{
if (message.IsRequest)
{
TSIP_Dialog newdialog = null;
switch ((message as TSIP_Request).RequestType)
{
case TSIP_Message.tsip_request_type_t.REGISTER:
{
/* incoming REGISTER */
TSIP_SessionRegister session = new TSIP_SessionRegister(mStack, message);
newdialog = new TSIP_DialogRegister(session, message.CallId == null ? null : message.CallId.Value);
break;
}
}
// for new dialog, create a new transac and start it later
if (newdialog != null)
{
transac = mStack.LayerTransac.CreateTransac(false, message, newdialog);
this.AddDialog(newdialog);
}
}
}
if (transac != null)
{
ret = transac.Start((message as TSIP_Request));
}
else if (message.IsRequest) /* No transaction match for the SIP request */
{
TSIP_Response response = null;
if (cid_matched) /* We are receiving our own message. */
{
response = new TSIP_Response(482, "Loop Detected (Check your iFCs)", (message as TSIP_Request));
if (String.IsNullOrEmpty(response.To.Tag))/* Early dialog? */
{
response.To.Tag = "doubango";
}
}
else
{
switch ((message as TSIP_Request).RequestType)
{
case TSIP_Message.tsip_request_type_t.OPTIONS: // Hacked to work on Tiscali IMS networks
case TSIP_Message.tsip_request_type_t.INFO:
{
response = new TSIP_Response(405, "Method Not Allowed", (message as TSIP_Request));
break;
}
default:
{
response = new TSIP_Response(481, "Dialog/Transaction Does Not Exist", (message as TSIP_Request));
break;
}
}
}
if (response != null)
{
// send the response
ret = mStack.LayerTransport.SendMessage(response.FirstVia != null ? response.FirstVia.Branch : "no-branch", response);
}
}
bail:
return(ret);
}