Fixed Bug #172, OpenBTS now sends CANCEL messages when there is no active call (instead of BYE)

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@3006 19bc5d8c-e614-43d4-8b26-e1612bc8e597

Control/CallControl.cpp

@@ -119,11 +119,16 @@ void forceSIPClearing(TransactionEntry *transaction)
 	SIP::SIPState state = transaction->SIPState();
 	LOG(INFO) << "SIP state " << state;
 	if (state==SIP::Cleared) return;
-	if (state!=SIP::MODClearing) {
+	if (state==SIP::Active){
-		// This also changes the SIP state to "clearing".
+		//Changes state to clearing
 		transaction->MODSendBYE();
-	} else {
+	} else if (state==SIP::MODCanceling){
+		transaction->MODResendCANCEL();
+	} else if (state==SIP::MODClearing) {
 		transaction->MODResendBYE();
+	} else {
+		//Changes state to canceling
+	        transaction->MODSendCANCEL();
 	}
 	transaction->MODWaitForOK();
 }
@@ -300,8 +305,16 @@ bool callManagementDispatchGSM(TransactionEntry *transaction, GSM::LogicalChanne
 		LCH->send(GSM::L3Release(transaction->L3TI()));
 		transaction->setTimer("308");
 		transaction->GSMState(GSM::ReleaseRequest);
-		// FIXME -- Maybe we need to send CANCEL.  See ticket #172.
+		//bug #172 fixed
+		if (transaction->SIPState()==SIP::Active){
 			transaction->MODSendBYE();
+		}
+		else{
+			transaction->MODSendCANCEL();
+			//if we disconnect, we don't get another
+			//of these, wait here? -kurtis
+			transaction->MODWaitForOK();
+		}
 		return false;
 	}
 

Control/TransactionTable.cpp

@@ -420,6 +420,14 @@ SIP::SIPState TransactionEntry::MODSendBYE()
 	return state;
 }
 
+SIP::SIPState TransactionEntry::MODSendCANCEL()
+{
+	ScopedLock lock(mLock);
+	SIP::SIPState state = mSIP.MODSendCANCEL();
+	echoSIPState(state);
+	return state;
+}
+
 SIP::SIPState TransactionEntry::MODResendBYE()
 {
 	ScopedLock lock(mLock);
@@ -428,6 +436,14 @@ SIP::SIPState TransactionEntry::MODResendBYE()
 	return state;
 }
 
+SIP::SIPState TransactionEntry::MODResendCANCEL()
+{
+	ScopedLock lock(mLock);
+	SIP::SIPState state = mSIP.MODResendCANCEL();
+	echoSIPState(state);
+	return state;
+}
+
 SIP::SIPState TransactionEntry::MODWaitForOK()
 {
 	ScopedLock lock(mLock);

Control/TransactionTable.h

@@ -198,7 +198,9 @@ class TransactionEntry {
 	void MTCInitRTP() { ScopedLock lock(mLock); mSIP.MTCInitRTP(); }
 
 	SIP::SIPState MODSendBYE();
+	SIP::SIPState MODSendCANCEL();
 	SIP::SIPState MODResendBYE();
+	SIP::SIPState MODResendCANCEL();
 	SIP::SIPState MODWaitForOK();
 
 	SIP::SIPState MTDCheckBYE();

SIP/SIPEngine.cpp

@@ -69,6 +69,7 @@ const char* SIP::SIPStateString(SIPState s)
 		case Fail: return "Fail"; 
 		case Busy: return "Busy";
 		case MODClearing: return "MODClearing";
+		case MODCanceling: return "MODCanceling";
 		case MTDClearing: return "MTDClearing";
 		case Cleared: return "Cleared";
 		case MessageSubmit: return "SMS-Submit";
@@ -93,7 +94,7 @@ SIPEngine::SIPEngine(const char* proxy, const char* IMSI)
 	mSIPPort(gConfig.getNum("SIP.Local.Port")),
 	mSIPIP(gConfig.getStr("SIP.Local.IP")),
 	mINVITE(NULL), mLastResponse(NULL), mBYE(NULL),
-	mSession(NULL),mTxTime(0), mRxTime(0),
+	mCANCEL(NULL), mSession(NULL), mTxTime(0), mRxTime(0),
 	mState(NullState),
 	mDTMF('\0'),mDTMFDuration(0)
 {
@@ -126,6 +127,7 @@ SIPEngine::~SIPEngine()
 	if (mINVITE!=NULL) osip_message_free(mINVITE);
 	if (mLastResponse!=NULL) osip_message_free(mLastResponse);
 	if (mBYE!=NULL) osip_message_free(mBYE);
+	if (mCANCEL!=NULL) osip_message_free(mCANCEL);
 	// FIXME -- Do we need to dispose of the RtpSesion *mSesison?
 }
 
@@ -184,6 +186,15 @@ void SIPEngine::saveBYE(const osip_message_t *BYE, bool mine)
 	osip_message_clone(BYE,&mBYE);
 }
 
+void SIPEngine::saveCANCEL(const osip_message_t *CANCEL, bool mine)
+{
+	// Instead of cloning, why not just keep the old one?
+	// Because that doesn't work in all calling contexts.
+	// This simplifies the call-handling logic.
+	if (mCANCEL!=NULL) osip_message_free(mCANCEL);
+	osip_message_clone(CANCEL,&mCANCEL);
+}
+
 
 
 void SIPEngine::user( const char * IMSI )
@@ -548,6 +559,20 @@ SIPState SIPEngine::MODSendBYE()
 	return mState;
 }
 
+SIPState SIPEngine::MODSendCANCEL()
+{
+	LOG(INFO) << "user " << mSIPUsername << " state " << mState;
+	assert(mINVITE);
+
+	osip_message_t * cancel = sip_cancel(mINVITE);
+	gSIPInterface.write(&mProxyAddr,cancel);
+	saveCANCEL(cancel, true);
+	osip_message_free(cancel);
+	mState = MODCanceling;
+	return mState;
+}
+	
+
 SIPState SIPEngine::MODResendBYE()
 {
 	LOG(INFO) << "user " << mSIPUsername << " state " << mState;
@@ -557,12 +582,21 @@ SIPState SIPEngine::MODResendBYE()
 	return mState;
 }
 
+SIPState SIPEngine::MODResendCANCEL()
+{
+	LOG(INFO) << "user " << mSIPUsername << " state " << mState;
+	assert(mState==MODCanceling);
+	assert(mCANCEL);
+	gSIPInterface.write(&mProxyAddr,mCANCEL);
+	return mState;
+}
+
 SIPState SIPEngine::MODWaitForOK()
 {
 	LOG(INFO) << "user " << mSIPUsername << " state " << mState;
 	bool responded = false;
-	Timeval byeTimeout(gConfig.getNum("SIP.Timer.F")); 
+	Timeval timeout(gConfig.getNum("SIP.Timer.F")); 
-	while (!byeTimeout.passed()) {
+	while (!timeout.passed()) {
 		try {
 			osip_message_t * ok = gSIPInterface.read(mCallID, gConfig.getNum("SIP.Timer.E"));
 			responded = true;
@@ -575,10 +609,16 @@ SIPState SIPEngine::MODWaitForOK()
 			break;
 		}
 		catch (SIPTimeout& e) {
+			//this is sketchy -kurtis
+			if (mState==MODCanceling){
+			  	LOG(NOTICE) << "response timeout, resending CANCEL";
+				MODResendCANCEL();
+			} else {
 			  	LOG(NOTICE) << "response timeout, resending BYE";
 				MODResendBYE();
 			}
 		}
+	}
 
 	if (!responded) { LOG(ALERT) << "lost contact with proxy " << mProxyIP << ":" << mProxyPort; }
 

SIP/SIPEngine.h

@@ -57,6 +57,7 @@ enum SIPState  {
 	Connecting,
 	Active,
 	MODClearing,
+	MODCanceling,
 	MTDClearing,
 	Cleared,
 	Fail,
@@ -108,6 +109,7 @@ private:
 	osip_message_t * mINVITE;	///< the INVITE message for this transaction
 	osip_message_t * mLastResponse;	///< the last response received for this transaction
 	osip_message_t * mBYE;		///< the BYE message for this transaction
+	osip_message_t * mCANCEL;	///< the CANCEL message for this transaction
 	//@}
 
 	/**@name RTP state and parameters. */
@@ -263,8 +265,12 @@ public:
 	//@{
 	SIPState MODSendBYE();
 
+	SIPState MODSendCANCEL();
+
 	SIPState MODResendBYE();
 
+	SIPState MODResendCANCEL();
+
 	SIPState MODWaitForOK();
 	//@}
 
@@ -320,6 +326,9 @@ public:
 	/** Save a copy of a BYE message in the engine. */
 	void saveBYE(const osip_message_t *BYE, bool mine);
 
+	/** Save a copy of a CANCEL message in the engine. */
+	void saveCANCEL(const osip_message_t *CANCEL, bool mine);
+
 
 
 	private:

SIP/SIPMessage.cpp

@@ -592,6 +592,22 @@ osip_message_t * SIP::sip_bye(const char * req_uri, const char * dialed_number,
 	return bye;
 }
 
+/* Cancel a previous invite */
+osip_message_t * SIP::sip_cancel( osip_message_t * invite)
+{
+
+	osip_message_t * cancel;
+	osip_message_init(&cancel);
+	osip_message_clone(invite, &cancel);
+	// FIXME -- Should use the "force_update" function.
+	cancel->message_property = 2;
+	cancel->sip_method = strdup("CANCEL");
+
+	//update message type
+	osip_cseq_set_method(cancel->cseq, strdup("CANCEL"));
+
+	return cancel;
+}
 
 osip_message_t * SIP::sip_okay_sdp( osip_message_t * inv, const char * sip_username, const char * local_ip, short wlocal_port, short rtp_port, unsigned audio_codec)
 {

SIP/SIPMessage.h

@@ -49,6 +49,7 @@ osip_message_t * sip_ack( const char * req_uri, const char * dialed_number, cons
 
 osip_message_t * sip_bye( const char * req_uri, const char * dialed_number, const char * sip_username, short local_port, const char * local_ip, const char * proxy_ip, short proxy_port, const osip_from_t *from_header, const osip_to_t * to_header, const char * via_branch, const osip_call_id_t* call_id_header, int cseq);
 
+osip_message_t * sip_cancel( osip_message_t * invite);
 
 osip_message_t * sip_okay_sdp( osip_message_t * inv, const char * sip_username, const char * local_ip, short wlocal_port, short rtp_port, unsigned audio_codecs );