SIPTransaction::Ptr SIPFSMDispatch::createClientTransaction(const SIPMessage::Ptr& pRequest)
{
if (!pRequest->isRequest())
throw OSS::SIP::SIPException("Sending a response using sendRequest() method is illegal");
std::string id;
if (!pRequest->getTransactionId(id))
throw OSS::SIP::SIPException("Unable to determine transaction identifier");
SIPTransaction::Ptr trn;
SIPTransportSession::Ptr nullTransport;
bool isAck = false;
if (OSS::string_caseless_starts_with(pRequest->startLine(), "invite"))
{
//
// This is an ICT
//
trn = _ict.findTransaction(pRequest, nullTransport);
}
else
{
//
// This is an NICT
//
isAck = pRequest->isRequest(OSS::SIP::REQ_ACK);
if (!isAck)
{
trn = _nict.findTransaction(pRequest, nullTransport);
}
}
return trn;
}
void SIPFSMDispatch::onReceivedMessage(SIPMessage::Ptr pMsg, SIPTransportSession::Ptr pTransport)
{
if (!pTransport->isEndpoint() && pTransport->getLastReadCount() < MIN_DATAGRAM_SIZE && !pTransport->isReliableTransport())
{
//
// datagram is too short to be a SIP Message
// Bailing out. Take note that streamed connection
// can split SIP messages to smaller frames
// and the last frame can be smaller than MIN_DATAGRAM_SIZE
// so we do not impose a limit for streams
//
return;
}
try
{
pMsg->parse();
}
catch(OSS::Exception e)
{
std::ostringstream logMsg;
logMsg << "Incoming message failed to be parsed - " << e.message()
<< " LEN: " << pTransport->getLastReadCount()
<< " SRC: " << pTransport->getRemoteAddress().toIpPortString();
OSS::log_warning(logMsg.str());
return;
}
std::string id;
if (!pMsg->getTransactionId(id))
return; // don't throw here
// we don't have control over what we receive from the transport
SIPTransaction::Ptr trn;
SIPTransaction::Type transactionType = SIPTransaction::TYPE_UNKNOWN;
if (pMsg->isRequest())
{
if (OSS::string_caseless_starts_with(pMsg->startLine(), "invite"))
{
transactionType = SIPTransaction::TYPE_IST;
if (_istBlocker.has(id))
{
OSS_LOG_WARNING("Blocked request retransmission - " << pMsg->startLine());
return;
}
trn = _ist.findTransaction(pMsg, pTransport);
}
else if (OSS::string_caseless_starts_with(pMsg->startLine(), "ack"))
{
//
// ACK for error responses will get matched to a transaction
//
transactionType = SIPTransaction::TYPE_IST;
trn = _ist.findTransaction(pMsg, pTransport, false);
}
else
{
transactionType = SIPTransaction::TYPE_NIST;
trn = _nist.findTransaction(pMsg, pTransport);
}
}
else if (!pMsg->isRequest())
{
std::string cseq;
cseq = pMsg->hdrGet(OSS::SIP::HDR_CSEQ);
if (OSS::string_caseless_ends_with(cseq, "invite"))
{
transactionType = SIPTransaction::TYPE_ICT;
trn = _ict.findTransaction(pMsg, pTransport, false);
}
else
{
transactionType = SIPTransaction::TYPE_NICT;
trn = _nict.findTransaction(pMsg, pTransport, false);
}
}
if (trn)
{
std::ostringstream logMsg;
if (!trn->getLogId().empty())
{
logMsg << trn->getLogId() << "Found Transaction " << trn->getId();
OSS::log_debug(logMsg.str());
}
else
{
trn->setLogId(pMsg->createContextId(true));
logMsg << trn->getLogId() << "Transaction " << trn->getId() << " CREATED";
OSS::log_information(logMsg.str());
}
}
if (!trn)
{
//
// We did not get a transaction, check if this is an ack and find the IST ACK transaction
//
if (transactionType == SIPTransaction::TYPE_IST && pMsg->isRequest("ACK"))
{
//
// No IST is existing in the ackable Pool.
// Report this ACK as orphaned to the UA CORE
//
if (_ackOr2xxTransactionHandler)
_ackOr2xxTransactionHandler(pMsg, pTransport);
}
else if (transactionType == SIPTransaction::TYPE_ICT && pMsg->is2xx())
{
if (_ackOr2xxTransactionHandler)
_ackOr2xxTransactionHandler(pMsg, pTransport);
}
else
{
std::ostringstream logMsg;
logMsg << pMsg->createContextId(true) << "Unable to match incoming request to a transaction - "
<< pMsg->startLine();
OSS::log_warning(logMsg.str());
}
}
else
{
if (!trn->transportService())
{
//
// This is a newly created transaction
//
trn->transportService() = &_transport;
trn->transport() = pTransport;
}
trn->onReceivedMessage(pMsg, pTransport);
}
}