/**
* 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;
}
/**
* Make a clone (deep copy) of this object. You can use this if you want to modify a request while
* preserving the original
*
* @return a deep copy of this object.
*/
public Object clone() {
SIPRequest retval = (SIPRequest) super.clone();
// Do not copy over the tx pointer -- this is only for internal
// tracking.
retval.transactionPointer = null;
if (this.requestLine != null) retval.requestLine = (RequestLine) this.requestLine.clone();
return retval;
}
/**
* 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);
}
}
}
/**
* Create a new default SIPRequest from the original request. Warning: the newly created
* SIPRequest, shares the headers of this request but we generate any new headers that we need to
* modify so the original request is umodified. However, if you modify the shared headers after
* this request is created, then the newly created request will also be modified. If you want to
* modify the original request without affecting the returned Request make sure you clone it
* before calling this method.
*
* <p>Only required headers are copied.
*
* <ul>
* <li>Contact headers are not included in the newly created request. Setting the appropriate
* sequence number is the responsibility of the caller.
* <li>RouteList is not copied for ACK and CANCEL
* <li>Note that we DO NOT copy the body of the argument into the returned header. We do not
* copy the content type header from the original request either. These have to be added
* seperately and the content length has to be correctly set if necessary the content length
* is set to 0 in the returned header.
* <li>Contact List is not copied from the original request.
* <li>RecordRoute List is not included from original request.
* <li>Via header is not included from the original request.
* </ul>
*
* @param requestLine is the new request line.
* @param switchHeaders is a boolean flag that causes to and from headers to switch (set this to
* true if you are the server of the transaction and are generating a BYE request). If the
* headers are switched, we generate new From and To headers otherwise we just use the
* incoming headers.
* @return a new Default SIP Request which has the requestLine specified.
*/
public SIPRequest createSIPRequest(RequestLine requestLine, boolean switchHeaders) {
SIPRequest newRequest = new SIPRequest();
newRequest.requestLine = requestLine;
Iterator headerIterator = this.getHeaders();
while (headerIterator.hasNext()) {
SIPHeader nextHeader = (SIPHeader) headerIterator.next();
// For BYE and cancel set the CSeq header to the
// appropriate method.
if (nextHeader instanceof CSeq) {
CSeq newCseq = (CSeq) nextHeader.clone();
nextHeader = newCseq;
try {
newCseq.setMethod(requestLine.getMethod());
} catch (ParseException e) {
}
} else if (nextHeader instanceof ViaList) {
Via via = (Via) (((ViaList) nextHeader).getFirst().clone());
via.removeParameter("branch");
nextHeader = via;
// Cancel and ACK preserve the branch ID.
} else if (nextHeader instanceof To) {
To to = (To) nextHeader;
if (switchHeaders) {
nextHeader = new From(to);
((From) nextHeader).removeTag();
} else {
nextHeader = (SIPHeader) to.clone();
((To) nextHeader).removeTag();
}
} else if (nextHeader instanceof From) {
From from = (From) nextHeader;
if (switchHeaders) {
nextHeader = new To(from);
((To) nextHeader).removeTag();
} else {
nextHeader = (SIPHeader) from.clone();
((From) nextHeader).removeTag();
}
} else if (nextHeader instanceof ContentLength) {
ContentLength cl = (ContentLength) nextHeader.clone();
try {
cl.setContentLength(0);
} catch (InvalidArgumentException e) {
}
nextHeader = cl;
} else if (!(nextHeader instanceof CallID) && !(nextHeader instanceof MaxForwards)) {
// Route is kept by dialog.
// RR is added by the caller.
// Contact is added by the Caller
// Any extension headers must be added
// by the caller.
continue;
}
try {
newRequest.attachHeader(nextHeader, false);
} catch (SIPDuplicateHeaderException e) {
e.printStackTrace();
}
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
newRequest.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return newRequest;
}
/**
* Creates an ACK for non-2xx responses according to RFC3261 17.1.1.3
*
* @return A SIPRequest with an ACK method.
* @throws SipException
* @throws NullPointerException
* @throws ParseException
* @author jvb
*/
public final SIPRequest createErrorAck(To responseToHeader) throws SipException, ParseException {
/*
* The ACK request constructed by the client transaction MUST contain values for the
* Call-ID, From, and Request-URI that are equal to the values of those header fields in
* the request passed to the transport by the client transaction (call this the "original
* request"). The To header field in the ACK MUST equal the To header field in the
* response being acknowledged, and therefore will usually differ from the To header field
* in the original request by the addition of the tag parameter. The ACK MUST contain a
* single Via header field, and this MUST be equal to the top Via header field of the
* original request. The CSeq header field in the ACK MUST contain the same value for the
* sequence number as was present in the original request, but the method parameter MUST
* be equal to "ACK".
*/
SIPRequest newRequest = new SIPRequest();
newRequest.setRequestLine((RequestLine) this.requestLine.clone());
newRequest.setMethod(Request.ACK);
newRequest.setHeader((Header) this.callIdHeader.clone());
newRequest.setHeader((Header) this.maxForwardsHeader.clone()); // ISSUE
// 130
// fix
newRequest.setHeader((Header) this.fromHeader.clone());
newRequest.setHeader((Header) responseToHeader.clone());
newRequest.addFirst((Header) this.getTopmostVia().clone());
newRequest.setHeader((Header) cSeqHeader.clone());
newRequest.getCSeq().setMethod(Request.ACK);
/*
* If the INVITE request whose response is being acknowledged had Route header fields,
* those header fields MUST appear in the ACK. This is to ensure that the ACK can be
* routed properly through any downstream stateless proxies.
*/
if (this.getRouteHeaders() != null) {
newRequest.setHeader((SIPHeaderList) this.getRouteHeaders().clone());
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
newRequest.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return newRequest;
}
/**
* Creates a default ACK SIPRequest message for this original request. Note that the defaultACK
* SIPRequest does not include the content of the original SIPRequest. If responseToHeader is null
* then the toHeader of this request is used to construct the ACK. Note that tag fields are just
* copied from the original SIP Request. Added by Jeff Keyser.
*
* @param responseToHeader To header to use for this request.
* @return A SIPRequest with an ACK method.
*/
public SIPRequest createAckRequest(To responseToHeader) {
SIPRequest newRequest;
Iterator headerIterator;
SIPHeader nextHeader;
newRequest = new SIPRequest();
newRequest.setRequestLine((RequestLine) this.requestLine.clone());
newRequest.setMethod(Request.ACK);
headerIterator = getHeaders();
while (headerIterator.hasNext()) {
nextHeader = (SIPHeader) headerIterator.next();
if (nextHeader instanceof RouteList) {
// Ack and cancel do not get ROUTE headers.
// Route header for ACK is assigned by the
// Dialog if necessary.
continue;
} else if (nextHeader instanceof ProxyAuthorization) {
// Remove proxy auth header.
// Assigned by the Dialog if necessary.
continue;
} else if (nextHeader instanceof ContentLength) {
// Adding content is responsibility of user.
nextHeader = (SIPHeader) nextHeader.clone();
try {
((ContentLength) nextHeader).setContentLength(0);
} catch (InvalidArgumentException e) {
}
} else if (nextHeader instanceof ContentType) {
// Content type header is removed since
// content length is 0.
continue;
} else if (nextHeader instanceof CSeq) {
// The CSeq header field in the
// ACK MUST contain the same value for the
// sequence number as was present in the
// original request, but the method parameter
// MUST be equal to "ACK".
CSeq cseq = (CSeq) nextHeader.clone();
try {
cseq.setMethod(Request.ACK);
} catch (ParseException e) {
}
nextHeader = cseq;
} else if (nextHeader instanceof To) {
if (responseToHeader != null) {
nextHeader = responseToHeader;
} else {
nextHeader = (SIPHeader) nextHeader.clone();
}
} else if (nextHeader instanceof ContactList || nextHeader instanceof Expires) {
// CONTACT header does not apply for ACK requests.
continue;
} else if (nextHeader instanceof ViaList) {
// Bug reported by Gianluca Martinello
// The ACK MUST contain a single Via header field,
// and this MUST be equal to the top Via header
// field of the original
// request.
nextHeader = (SIPHeader) ((ViaList) nextHeader).getFirst().clone();
} else {
nextHeader = (SIPHeader) nextHeader.clone();
}
try {
newRequest.attachHeader(nextHeader, false);
} catch (SIPDuplicateHeaderException e) {
e.printStackTrace();
}
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
newRequest.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return newRequest;
}
/**
* Creates a default SIPResquest message that would cancel this request. Note that tag assignment
* and removal of is left to the caller (we use whatever tags are present in the original
* request).
*
* @return A CANCEL SIPRequest constructed according to RFC3261 section 9.1
* @throws SipException
* @throws ParseException
*/
public SIPRequest createCancelRequest() throws SipException {
// see RFC3261 9.1
// A CANCEL request SHOULD NOT be sent to cancel a request other than
// INVITE
if (!this.getMethod().equals(Request.INVITE))
throw new SipException("Attempt to create CANCEL for " + this.getMethod());
/*
* The following procedures are used to construct a CANCEL request. The Request-URI,
* Call-ID, To, the numeric part of CSeq, and From header fields in the CANCEL request
* MUST be identical to those in the request being cancelled, including tags. A CANCEL
* constructed by a client MUST have only a single Via header field value matching the top
* Via value in the request being cancelled. Using the same values for these header fields
* allows the CANCEL to be matched with the request it cancels (Section 9.2 indicates how
* such matching occurs). However, the method part of the CSeq header field MUST have a
* value of CANCEL. This allows it to be identified and processed as a transaction in its
* own right (See Section 17).
*/
SIPRequest cancel = new SIPRequest();
cancel.setRequestLine((RequestLine) this.requestLine.clone());
cancel.setMethod(Request.CANCEL);
cancel.setHeader((Header) this.callIdHeader.clone());
cancel.setHeader((Header) this.toHeader.clone());
cancel.setHeader((Header) cSeqHeader.clone());
try {
cancel.getCSeq().setMethod(Request.CANCEL);
} catch (ParseException e) {
e.printStackTrace(); // should not happen
}
cancel.setHeader((Header) this.fromHeader.clone());
cancel.addFirst((Header) this.getTopmostVia().clone());
cancel.setHeader((Header) this.maxForwardsHeader.clone());
/*
* If the request being cancelled contains a Route header field, the CANCEL request MUST
* include that Route header field's values.
*/
if (this.getRouteHeaders() != null) {
cancel.setHeader((SIPHeaderList) this.getRouteHeaders().clone());
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
cancel.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return cancel;
}
/**
* 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;
}
