/**
* 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;
}
/**
* Find the transaction corresponding to a given request.
*
* @param sipMessage request for which to retrieve the transaction.
* @param isServer search the server transaction table if true.
* @return the transaction object corresponding to the request or null if no such mapping exists.
*/
public SIPTransaction findTransaction(SIPMessage sipMessage, boolean isServer) {
SIPTransaction retval = null;
if (isServer) {
Via via = sipMessage.getTopmostVia();
if (via.getBranch() != null) {
String key = sipMessage.getTransactionId();
synchronized (this.serverTransactionTable) {
retval = (SIPTransaction) serverTransactionTable.get(key);
if (LogWriter.needsLogging) logMessage("looking for key " + key);
if (retval != null && retval.isMessagePartOfTransaction(sipMessage)) return retval;
}
}
// Need to scan the table for old style transactions (RFC 2543
// style)
synchronized (this.serverTransactions) {
Iterator<SIPServerTransaction> it = serverTransactions.iterator();
while (it.hasNext()) {
SIPServerTransaction sipServerTransaction = (SIPServerTransaction) it.next();
if (sipServerTransaction.isMessagePartOfTransaction(sipMessage))
return sipServerTransaction;
}
}
} else {
Via via = sipMessage.getTopmostVia();
if (via.getBranch() != null) {
String key = sipMessage.getTransactionId();
synchronized (this.clientTransactionTable) {
retval = (SIPTransaction) clientTransactionTable.get(key);
if (retval != null && retval.isMessagePartOfTransaction(sipMessage)) return retval;
}
}
// Need to scan the table for old style transactions (RFC 2543
// style)
synchronized (this.clientTransactions) {
Iterator<SIPClientTransaction> it = clientTransactions.iterator();
while (it.hasNext()) {
SIPClientTransaction clientTransaction = (SIPClientTransaction) it.next();
if (clientTransaction.isMessagePartOfTransaction(sipMessage)) return clientTransaction;
}
}
}
return null;
}
/**
* Handles a new SIP response. It finds a client transaction to handle this message. If none
* exists, it sends the message directly to the superclass.
*
* @param responseReceived Response to handle.
* @param responseMessageChannel Channel that received message.
* @return A client transaction.
*/
protected ServerResponseInterface newSIPServerResponse(
SIPResponse responseReceived, MessageChannel responseMessageChannel) {
// System.out.println("response = " + responseReceived.encode());
// Iterator through all client transactions
Iterator<SIPClientTransaction> transactionIterator;
// Next transaction in the set
SIPClientTransaction nextTransaction;
// Transaction to handle this request
SIPClientTransaction currentTransaction;
String key = responseReceived.getTransactionId();
currentTransaction = (SIPClientTransaction) clientTransactionTable.get(key);
if (currentTransaction == null
|| !currentTransaction.isMessagePartOfTransaction(responseReceived)) {
// Loop through all server transactions
synchronized (clientTransactions) {
transactionIterator = clientTransactions.iterator();
currentTransaction = null;
while (transactionIterator.hasNext() && currentTransaction == null) {
nextTransaction = (SIPClientTransaction) transactionIterator.next();
// If this transaction should handle this request,
if (nextTransaction.isMessagePartOfTransaction(responseReceived)) {
// Mark this transaction as the one to
// handle this message
currentTransaction = nextTransaction;
}
}
}
// If no transaction exists to handle this message,
if (currentTransaction == null) {
// Pass the message directly to the TU
return super.newSIPServerResponse(responseReceived, responseMessageChannel);
}
}
// Set ths transaction's encapsulated response interface
// from the superclass
currentTransaction.setResponseInterface(
super.newSIPServerResponse(responseReceived, currentTransaction));
return currentTransaction;
}
/**
* Removes from the specified list of candidates providers connected to a registrar that does not
* match the IP address that we are receiving a request from.
*
* @param candidates the list of providers we've like to filter.
* @param request the request that we are currently dispatching
*/
private void filterByAddress(List<ProtocolProviderServiceSipImpl> candidates, Request request) {
Iterator<ProtocolProviderServiceSipImpl> iterPP = candidates.iterator();
while (iterPP.hasNext()) {
ProtocolProviderServiceSipImpl candidate = iterPP.next();
if (candidate.getRegistrarConnection() == null) {
// RegistrarLess connections are ok
continue;
}
if (!candidate.getRegistrarConnection().isRegistrarless()
&& !candidate.getRegistrarConnection().isRequestFromSameConnection(request)) {
iterPP.remove();
}
}
}
/**
* Find the <tt>ProtocolProviderServiceSipImpl</tt> (one of our "candidate recipient" listeners)
* which this <tt>request</tt> should be dispatched to. The strategy is to look first at the
* request URI, and then at the To field to find a matching candidate for dispatching. Note that
* this method takes a <tt>Request</tt> as param, and not a <tt>ServerTransaction</tt>, because
* sometimes <tt>RequestEvent</tt>s have no associated <tt>ServerTransaction</tt>.
*
* @param request the <tt>Request</tt> to find a recipient for.
* @return a suitable <tt>ProtocolProviderServiceSipImpl</tt>.
*/
private ProtocolProviderServiceSipImpl findTargetFor(Request request) {
if (request == null) {
logger.error("request shouldn't be null.");
return null;
}
List<ProtocolProviderServiceSipImpl> currentListenersCopy =
new ArrayList<ProtocolProviderServiceSipImpl>(this.getSipListeners());
// Let's first narrow down candidate choice by comparing
// addresses and ports (no point in delivering to a provider with a
// non matching IP address since they will reject it anyway).
filterByAddress(currentListenersCopy, request);
if (currentListenersCopy.size() == 0) {
logger.error("no listeners");
return null;
}
URI requestURI = request.getRequestURI();
if (requestURI.isSipURI()) {
String requestUser = ((SipURI) requestURI).getUser();
List<ProtocolProviderServiceSipImpl> candidates =
new ArrayList<ProtocolProviderServiceSipImpl>();
// check if the Request-URI username is
// one of ours usernames
for (ProtocolProviderServiceSipImpl listener : currentListenersCopy) {
String ourUserID = listener.getAccountID().getUserID();
// logger.trace(ourUserID + " *** " + requestUser);
if (ourUserID.equals(requestUser)) {
if (logger.isTraceEnabled())
logger.trace("suitable candidate found: " + listener.getAccountID());
candidates.add(listener);
}
}
// the perfect match
// every other case is approximation
if (candidates.size() == 1) {
ProtocolProviderServiceSipImpl perfectMatch = candidates.get(0);
if (logger.isTraceEnabled())
logger.trace("Will dispatch to \"" + perfectMatch.getAccountID() + "\"");
return perfectMatch;
}
// more than one account match
if (candidates.size() > 1) {
// check if a custom param exists in the contact
// address (set for registrar accounts)
for (ProtocolProviderServiceSipImpl candidate : candidates) {
String hostValue =
((SipURI) requestURI).getParameter(SipStackSharing.CONTACT_ADDRESS_CUSTOM_PARAM_NAME);
if (hostValue == null) continue;
if (hostValue.equals(candidate.getContactAddressCustomParamValue())) {
if (logger.isTraceEnabled())
logger.trace(
"Will dispatch to \""
+ candidate.getAccountID()
+ "\" because "
+ "\" the custom param was set");
return candidate;
}
}
// Past this point, our guess is not reliable. We try to find
// the "least worst" match based on parameters like the To field
// check if the To header field host part
// matches any of our SIP hosts
for (ProtocolProviderServiceSipImpl candidate : candidates) {
URI fromURI = ((FromHeader) request.getHeader(FromHeader.NAME)).getAddress().getURI();
if (fromURI.isSipURI() == false) continue;
SipURI ourURI = (SipURI) candidate.getOurSipAddress((SipURI) fromURI).getURI();
String ourHost = ourURI.getHost();
URI toURI = ((ToHeader) request.getHeader(ToHeader.NAME)).getAddress().getURI();
if (toURI.isSipURI() == false) continue;
String toHost = ((SipURI) toURI).getHost();
// logger.trace(toHost + "***" + ourHost);
if (toHost.equals(ourHost)) {
if (logger.isTraceEnabled())
logger.trace(
"Will dispatch to \""
+ candidate.getAccountID()
+ "\" because "
+ "host in the To: is the same as in our AOR");
return candidate;
}
}
// fallback on the first candidate
ProtocolProviderServiceSipImpl target = candidates.iterator().next();
logger.info(
"Will randomly dispatch to \""
+ target.getAccountID()
+ "\" because there is ambiguity on the username from"
+ " the Request-URI");
if (logger.isTraceEnabled()) logger.trace("\n" + request);
return target;
}
// fallback on any account
ProtocolProviderServiceSipImpl target = currentListenersCopy.iterator().next();
if (logger.isDebugEnabled())
logger.debug(
"Will randomly dispatch to \""
+ target.getAccountID()
+ "\" because the username in the Request-URI "
+ "is unknown or empty");
if (logger.isTraceEnabled()) logger.trace("\n" + request);
return target;
} else {
logger.error("Request-URI is not a SIP URI, dropping");
}
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;
}