/**
* Find a matching client SUBSCRIBE to the incoming notify. NOTIFY requests are matched to such
* SUBSCRIBE requests if they contain the same "Call-ID", a "To" header "tag" parameter which
* matches the "From" header "tag" parameter of the SUBSCRIBE, and the same "Event" header field.
* Rules for comparisons of the "Event" headers are described in section 7.2.1. If a matching
* NOTIFY request contains a "Subscription-State" of "active" or "pending", it creates a new
* subscription and a new dialog (unless they have already been created by a matching response, as
* described above).
*
* @param notifyMessage
*/
public SIPClientTransaction findSubscribeTransaction(SIPRequest notifyMessage) {
synchronized (clientTransactions) {
Iterator<SIPClientTransaction> it = clientTransactions.iterator();
String thisToTag = notifyMessage.getTo().getTag();
if (thisToTag == null) return null;
Event eventHdr = (Event) notifyMessage.getHeader(EventHeader.NAME);
if (eventHdr == null) return null;
while (it.hasNext()) {
SIPClientTransaction ct = (SIPClientTransaction) it.next();
// SIPRequest sipRequest = ct.getOriginalRequest();
String fromTag = ct.from.getTag();
Event hisEvent = ct.event;
// Event header is mandatory but some slopply clients
// dont include it.
if (hisEvent == null) continue;
if (ct.method.equals(Request.SUBSCRIBE)
&& fromTag.equalsIgnoreCase(thisToTag)
&& hisEvent != null
&& eventHdr.match(hisEvent)
&& notifyMessage.getCallId().getCallId().equalsIgnoreCase(ct.callId.getCallId()))
return ct;
}
}
return null;
}
/**
* Performs strict router fix according to RFC3261 section 16.6 step 6
*
* <p>pre: top route header in request has no 'lr' parameter in URI post: request-URI added as
* last route header, new req-URI = top-route-URI
*/
public void fixStrictRouting(SIPRequest req) {
RouteList routes = req.getRouteHeaders();
Route first = (Route) routes.getFirst();
SipUri firstUri = (SipUri) first.getAddress().getURI();
routes.removeFirst();
// Add request-URI as last Route entry
AddressImpl addr = new AddressImpl();
addr.setAddess(req.getRequestURI()); // don't clone it
Route route = new Route(addr);
routes.add(route); // as last one
req.setRequestURI(firstUri);
if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("post: fixStrictRouting" + req);
}
}
/** Hash table for quick lookup of transactions. */
protected void addTransactionHash(SIPTransaction sipTransaction) {
SIPRequest sipRequest = sipTransaction.getOriginalRequest();
// Via via = sipRequest.getTopmostVia();
// Cannot cache old style requests.
/**
* if (via.getBranch() == null || ! via.getBranch().toUpperCase().startsWith
* (SIPConstants.BRANCH_MAGIC_COOKIE.toUpperCase())){ return; }
*/
if (sipTransaction instanceof SIPClientTransaction) {
synchronized (clientTransactionTable) {
String key = sipRequest.getTransactionId();
clientTransactionTable.put(key, sipTransaction);
}
} else {
synchronized (serverTransactionTable) {
String key = sipRequest.getTransactionId();
serverTransactionTable.put(key, sipTransaction);
}
}
}
/**
* Return addresses for default proxy to forward the request to. The list is organized in the
* following priority. If the requestURI refers directly to a host, the host and port information
* are extracted from it and made the next hop on the list. If the default route has been
* specified, then it is used to construct the next element of the list. <code>
* RouteHeader firstRoute = (RouteHeader) req.getHeader( RouteHeader.NAME );
* if (firstRoute!=null) {
* URI uri = firstRoute.getAddress().getURI();
* if (uri.isSIPUri()) {
* SipURI nextHop = (SipURI) uri;
* if ( nextHop.hasLrParam() ) {
* // OK, use it
* } else {
* nextHop = fixStrictRouting( req ); <--- Here, make the modifications as per RFC3261
* }
* } else {
* // error: non-SIP URI not allowed in Route headers
* throw new SipException( "Request has Route header with non-SIP URI" );
* }
* } else if (outboundProxy!=null) {
* // use outbound proxy for nextHop
* } else if ( req.getRequestURI().isSipURI() ) {
* // use request URI for nextHop
* }
*
* </code>
*
* @param request is the sip request to route.
*/
public Hop getNextHop(Request request) throws SipException {
SIPRequest sipRequest = (SIPRequest) request;
RequestLine requestLine = sipRequest.getRequestLine();
if (requestLine == null) {
return defaultRoute;
}
javax.sip.address.URI requestURI = requestLine.getUri();
if (requestURI == null) throw new IllegalArgumentException("Bad message: Null requestURI");
RouteList routes = sipRequest.getRouteHeaders();
/*
* In case the topmost Route header contains no 'lr' parameter (which
* means the next hop is a strict router), the implementation will
* perform 'Route Information Postprocessing' as described in RFC3261
* section 16.6 step 6 (also known as "Route header popping"). That is,
* the following modifications will be made to the request:
*
* The implementation places the Request-URI into the Route header field
* as the last value.
*
* The implementation then places the first Route header field value
* into the Request-URI and removes that value from the Route header
* field.
*
* Subsequently, the request URI will be used as next hop target
*/
if (routes != null) {
// to send the request through a specified hop the application is
// supposed to prepend the appropriate Route header which.
Route route = (Route) routes.getFirst();
URI uri = route.getAddress().getURI();
if (uri.isSipURI()) {
SipURI sipUri = (SipURI) uri;
if (!sipUri.hasLrParam()) {
fixStrictRouting(sipRequest);
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger().logDebug("Route post processing fixed strict routing");
}
Hop hop = createHop(sipUri, request);
if (sipStack.isLoggingEnabled())
sipStack.getStackLogger().logDebug("NextHop based on Route:" + hop);
return hop;
} else {
throw new SipException("First Route not a SIP URI");
}
} else if (requestURI.isSipURI() && ((SipURI) requestURI).getMAddrParam() != null) {
Hop hop = createHop((SipURI) requestURI, request);
if (sipStack.isLoggingEnabled())
sipStack
.getStackLogger()
.logDebug("Using request URI maddr to route the request = " + hop.toString());
// JvB: don't remove it!
// ((SipURI) requestURI).removeParameter("maddr");
return hop;
} else if (defaultRoute != null) {
if (sipStack.isLoggingEnabled())
sipStack
.getStackLogger()
.logDebug("Using outbound proxy to route the request = " + defaultRoute.toString());
return defaultRoute;
} else if (requestURI.isSipURI()) {
Hop hop = createHop((SipURI) requestURI, request);
if (hop != null && sipStack.isLoggingEnabled())
sipStack.getStackLogger().logDebug("Used request-URI for nextHop = " + hop.toString());
else if (sipStack.isLoggingEnabled()) {
sipStack.getStackLogger().logDebug("returning null hop -- loop detected");
}
return hop;
} else {
// The internal router should never be consulted for non-sip URIs.
InternalErrorHandler.handleException(
"Unexpected non-sip URI", this.sipStack.getStackLogger());
return null;
}
}
/**
* Handles a new SIP request. It finds a server transaction to handle this message. If none
* exists, it creates a new transaction.
*
* @param requestReceived Request to handle.
* @param requestMessageChannel Channel that received message.
* @return A server transaction.
*/
protected ServerRequestInterface newSIPServerRequest(
SIPRequest requestReceived, MessageChannel requestMessageChannel) {
// Iterator through all server transactions
Iterator<SIPServerTransaction> transactionIterator;
// Next transaction in the set
SIPServerTransaction nextTransaction;
// Transaction to handle this request
SIPServerTransaction currentTransaction;
String key = requestReceived.getTransactionId();
currentTransaction = (SIPServerTransaction) serverTransactionTable.get(key);
if (currentTransaction == null
|| !currentTransaction.isMessagePartOfTransaction(requestReceived)) {
// Loop through all server transactions
synchronized (serverTransactions) {
transactionIterator = serverTransactions.iterator();
currentTransaction = null;
while (transactionIterator.hasNext() && currentTransaction == null) {
nextTransaction = (SIPServerTransaction) transactionIterator.next();
// If this transaction should handle this request,
if (nextTransaction.isMessagePartOfTransaction(requestReceived)) {
// Mark this transaction as the one
// to handle this message
currentTransaction = nextTransaction;
}
}
// If no transaction exists to handle this message
if (currentTransaction == null) {
currentTransaction = findPendingTransaction(requestReceived);
if (currentTransaction != null) return currentTransaction;
currentTransaction = createServerTransaction(requestMessageChannel);
currentTransaction.setOriginalRequest(requestReceived);
if (!isDialogCreated(requestReceived.getMethod())) {
// Dialog is not created - can we find the state?
// If so, then create a transaction and add it.
String dialogId = requestReceived.getDialogId(true);
SIPDialog dialog = getDialog(dialogId);
// Sequence numbers are supposed to increment.
// avoid processing old sequence numbers and
// delivering the same request up to the
// application if the request has already been seen.
// Special handling applies to ACK processing.
if (dialog != null
&& (requestReceived.getMethod().equals(Request.ACK)
|| requestReceived.getCSeq().getSequenceNumber()
> dialog.getRemoteSequenceNumber())) {
// Found a dialog.
if (LogWriter.needsLogging)
logWriter.logMessage("adding server transaction " + currentTransaction);
serverTransactions.add(0, currentTransaction);
addTransactionHash(currentTransaction);
currentTransaction.startTransactionTimer();
currentTransaction.isMapped = true;
}
} else {
// Create the transaction but dont map it.
String dialogId = requestReceived.getDialogId(true);
SIPDialog dialog = getDialog(dialogId);
// This is a dialog creating request that is part of an
// existing dialog (eg. re-Invite). Re-invites get a non
// null server transaction Id (unlike the original
// invite).
if (dialog != null
&& requestReceived.getCSeq().getSequenceNumber()
> dialog.getRemoteSequenceNumber()) {
currentTransaction.map();
if (LogWriter.needsLogging)
logWriter.logMessage("adding server transaction " + currentTransaction);
serverTransactions.add(0, currentTransaction);
addTransactionHash(currentTransaction);
currentTransaction.startTransactionTimer();
currentTransaction.toListener = true;
}
}
}
}
}
// Set ths transaction's encapsulated request
// interface from the superclass
currentTransaction.setRequestInterface(
super.newSIPServerRequest(requestReceived, currentTransaction));
return currentTransaction;
}