void Control::InCallMOSMSStarter(TransactionEntry *parallelCall)
{
GSM::LogicalChannel *hostChan = parallelCall->channel();
assert(hostChan);
GSM::LogicalChannel *SACCH = hostChan->SACCH();
assert(SACCH);
// Create a partial transaction record.
TransactionEntry *newTransaction = new TransactionEntry(
gConfig.getStr("SIP.Proxy.SMS").c_str(),
parallelCall->subscriber(),
SACCH);
gTransactionTable.add(newTransaction);
}
GSM::LogicalChannel* TransactionTable::findChannel(const L3MobileIdentity& mobileID)
{
// Yes, it's linear time.
// Even in a 6-ARFCN system, it should rarely be more than a dozen entries.
// Since clearDeadEntries is also linear, do that here, too.
clearDeadEntries();
// Brtue force search.
ScopedLock lock(mLock);
for (TransactionMap::iterator itr = mTable.begin(); itr!=mTable.end(); ++itr) {
if (itr->second->subscriber() != mobileID) continue;
GSM::LogicalChannel* chan = itr->second->channel();
if (!chan) continue;
if (chan->type() == FACCHType) return chan;
if (chan->type() == SDCCHType) return chan;
}
return NULL;
}
bool SIPInterface::checkInvite( osip_message_t * msg)
{
LOG(DEBUG);
// This code dispatches new transactions coming from the network-side SIP interface.
// All transactions originating here are going to be mobile-terminated.
// Yes, this method is too long and needs to be broken up into smaller steps.
// Is there even a method?
const char *method = msg->sip_method;
if (!method) return false;
// Check for INVITE or MESSAGE methods.
// Check channel availability now, too.
GSM::ChannelType requiredChannel;
bool channelAvailable = false;
GSM::L3CMServiceType serviceType;
// pretty sure strings are garbage collected
string proxy = get_return_address(msg);
if (strcmp(method,"INVITE") == 0) {
// INVITE is for MTC.
// Set the required channel type to match the assignment style.
if (gConfig.defines("Control.VEA")) {
// Very early assignment.
requiredChannel = GSM::TCHFType;
channelAvailable = gBTS.TCHAvailable();
} else {
// Early assignment
requiredChannel = GSM::SDCCHType;
channelAvailable = gBTS.SDCCHAvailable() && gBTS.TCHAvailable();
}
serviceType = L3CMServiceType::MobileTerminatedCall;
}
else if (strcmp(method,"MESSAGE") == 0) {
// MESSAGE is for MTSMS.
requiredChannel = GSM::SDCCHType;
channelAvailable = gBTS.SDCCHAvailable();
serviceType = L3CMServiceType::MobileTerminatedShortMessage;
}
else {
// Not a method handled here.
LOG(DEBUG) << "non-initiating SIP method " << method;
return false;
}
// Get request username (IMSI) from invite.
const char* IMSI = extractIMSI(msg);
if (!IMSI) {
// FIXME -- Send appropriate error (404) on SIP interface.
LOG(WARNING) << "Incoming INVITE/MESSAGE with no IMSI";
return false;
}
L3MobileIdentity mobileID(IMSI);
// Get the SIP call ID.
const char * callIDNum = extractCallID(msg);
if (!callIDNum) {
// FIXME -- Send appropriate error on SIP interface.
LOG(WARNING) << "Incoming INVITE/MESSAGE with no call ID";
return false;
}
// Find any active transaction for this IMSI with an assigned TCH or SDCCH.
GSM::LogicalChannel *chan = gTransactionTable.findChannel(mobileID);
if (chan) {
// If the type is TCH and the service is SMS, get the SACCH.
// Otherwise, for now, just say chan=NULL.
if (serviceType==L3CMServiceType::MobileTerminatedShortMessage && chan->type()==FACCHType) {
chan = chan->SACCH();
} else {
// FIXME -- This will change to support multiple transactions.
chan = NULL;
}
}
// Check SIP map. Repeated entry? Page again.
if (mSIPMap.map().readNoBlock(callIDNum) != NULL) {
TransactionEntry* transaction= gTransactionTable.find(mobileID,callIDNum);
// There's a FIFO but no trasnaction record?
if (!transaction) {
LOG(WARNING) << "repeated INVITE/MESSAGE with no transaction record";
// Delete the bogus FIFO.
mSIPMap.remove(callIDNum);
return false;
}
// There is transaction already. Send trying, if appropriate.
if (serviceType!=L3CMServiceType::MobileTerminatedShortMessage) transaction->MTCSendTrying();
// And if no channel is established yet, page again.
if (!chan) {
LOG(INFO) << "repeated SIP INVITE/MESSAGE, repaging for transaction " << *transaction;
gBTS.pager().addID(mobileID,requiredChannel,*transaction);
}
return false;
}
// So we will need a new channel.
// Check gBTS for channel availability.
if (!chan && !channelAvailable) {
// FIXME -- Send 503 "Service Unavailable" response on SIP interface.
// Don't forget the retry-after header.
LOG(NOTICE) << "MTC CONGESTION, no " << requiredChannel << " availble for assignment";
return false;
}
if (chan) { LOG(INFO) << "using existing channel " << chan->descriptiveString(); }
else { LOG(INFO) << "set up MTC paging for channel=" << requiredChannel; }
// Add an entry to the SIP Map to route inbound SIP messages.
addCall(callIDNum);
LOG(DEBUG) << "callIDNum " << callIDNum << " IMSI " << IMSI;
// Get the caller ID if it's available.
const char *callerID = "";
const char *callerHost = "";
osip_from_t *from = osip_message_get_from(msg);
if (from) {
osip_uri_t* url = osip_contact_get_url(from);
if (url) {
if (url->username) callerID = url->username;
if (url->host) callerHost = url->host;
}
} else {
LOG(NOTICE) << "INVITE with no From: username for " << mobileID;
}
LOG(DEBUG) << "callerID " << callerID << "@" << callerHost;
// Build the transaction table entry.
// This constructor sets TI automatically for an MT transaction.
TransactionEntry *transaction = new TransactionEntry(proxy.c_str(),mobileID,chan,serviceType,callerID);
// FIXME -- These parameters should be arguments to the constructor above.
transaction->SIPUser(callIDNum,IMSI,callerID,callerHost);
transaction->saveINVITE(msg,false);
// Tell the sender we are trying.
if (serviceType!=L3CMServiceType::MobileTerminatedShortMessage) transaction->MTCSendTrying();
// SMS? Get the text message body to deliver.
if (serviceType == L3CMServiceType::MobileTerminatedShortMessage) {
osip_body_t *body;
osip_content_type_t *contentType;
osip_message_get_body(msg,0,&body);
contentType = osip_message_get_content_type(msg);
const char *text = NULL;
char *type = NULL;
if (body) text = body->body;
if (text) transaction->message(text, body->length);
else LOG(NOTICE) << "MTSMS incoming MESSAGE method with no message body for " << mobileID;
/* Ok, so osip does some funny stuff here. The MIME type is split into type and subType.
Basically, text/plain becomes type=text, subType=plain. We need to put those together...
*/
if (contentType) {
type = (char *)malloc(strlen(contentType->type)+strlen(contentType->subtype)+2);
}
if (type) {
strcpy(type,contentType->type);
strcat(type,"/");
strcat(type,contentType->subtype);
transaction->messageType(type);
free(type);
}
else LOG(NOTICE) << "MTSMS incoming MESSAGE method with no content type (or memory error) for " << mobileID;
}
LOG(INFO) << "MTC MTSMS make transaction and add to transaction table: "<< *transaction;
gTransactionTable.add(transaction);
// If there's an existing channel, skip the paging step.
if (!chan) {
// Add to paging list.
LOG(DEBUG) << "MTC MTSMS new SIP invite, initial paging for mobile ID " << mobileID;
gBTS.pager().addID(mobileID,requiredChannel,*transaction);
} else {
// Add a transaction to an existing channel.
chan->addTransaction(transaction);
// FIXME -- We need to write something into the channel to trigger the new transaction.
// We need to send a message into the chan's dispatch loop,
// becasue we can't block this thread to run the transaction.
}
return true;
}