Method makeRegisterMsg

SIP/SIPBase.cpp:456–494

We wrap our REGISTER messages inside a dialog object, even though it is technically not a dialog.

// We wrap our REGISTER messages inside a dialog object, even though it is technically not a dialog.
SipMessage *SipBase::makeRegisterMsg(DialogType wMethod, const L3LogicalChannel* chan, string RAND, const FullMobileId &msid, const char *SRES)
{
	// TODO: We need to make a transaction here...
	static const string registerStr("REGISTER");
	// The request URI is special for REGISTER;
	string reqUri = string("sip:") + proxyIP();
	// We formerly allocated a new Dialog for each REGISTER message so the IMSI was stashed in the dialog, and localSipUri() worked.
	//SipPreposition myUri(localSipUri());
	string username = msid.fmidUsername();
	// RFC3261 is somewhat contradictory on the From-tag and To-tag.
	// The documentation for 'from' says the from-tag is always included.
	// The examples in 24.1 show a From-tag but no To-tag.
	// The To-tag includes the optional <>, and Paul at null team incorrectly thought the <> were required,
	// so we will include them as that appears to be common practice.
	string myUriString = makeUri(username,dsPeer()->mipName,0);	// The port, if any, is already in mipName.
	//string fromUriString = makeUriWithTag(username,dsPeer()->mipName,make_tag());	// The port, if any, is already in mipName.
	SipPreposition toHeader("",myUriString,"");
	SipPreposition fromHeader("",myUriString,make_tag());
	dsNextCSeq();	// Advance CSeqNum.
	SipMessage *msg = makeRequest(registerStr,reqUri,username,&toHeader,&fromHeader,make_branch());

	// Replace the Contact header so we can set the expires option.  What a botched up spec.
	// Replace the P-Preferred-Identity
	unsigned expires;
	if (wMethod == SIPDTRegister ) {
		expires = 60*gConfig.getNum("SIP.RegistrationPeriod");
		if (SRES && strlen(SRES)) {
			msg->msmAuthorizationValue = format("Digest, nonce=%s, uri=%s, response=%s",RAND.c_str(),msid.mImsi.c_str(),SRES);
		}
	} else if (wMethod == SIPDTUnregister ) {
		expires = 0;
	} else { assert(0); }
	// We use myURI instead of localContact because the SIPDialog for REGISTER is shared by all REGISTER
	// users and does not contain the personal info for this user.
	//msg->msmContactValue = format("<%s>;expires=%u",myUriString.c_str(),expires);
	msg->msmContactValue = localContact(username,expires);
	writePrivateHeaders(msg,chan);
	return msg;
}