Function update_sock_struct_from_via

forward.c:431–489

int update_sock_struct_from_via( union sockaddr_union* to,
								 struct sip_msg* msg,
								 struct via_body* via )
{
	struct hostent* he;
	str* name;
	int err;
	unsigned short port;

	port=0;
	if(via==msg->via1){
		/* _local_ reply, we ignore any rport or received value
		 * (but we will send back to the original port if rport is
		 *  present) */
		if ((msg->msg_flags&FL_FORCE_RPORT)||(via->rport))
			port=msg->rcv.src_port;
		else port=via->port;
		if(via->maddr)
			name= &(via->maddr->value);
		else
			name=&(via->host); /* received=ip in 1st via is ignored (it's
							  not added by us so it's bad) */
	}else{
		/* "normal" reply, we use rport's & received value if present */
		if (via->rport && via->rport->value.s){
			LM_DBG("using 'rport'\n");
			port=str2s(via->rport->value.s, via->rport->value.len, &err);
			if (err){
				LM_NOTICE("bad rport value(%.*s)\n",
					via->rport->value.len,via->rport->value.s);
				port=0;
			}
		}

		if (via->maddr){
			name= &(via->maddr->value);
			if (port==0) port=via->port?via->port:SIP_PORT;
		} else if (via->received){
			LM_DBG("using 'received'\n");
			name=&(via->received->value);
			/* making sure that we won't do SRV lookup on "received" */
			if (port==0) port=via->port?via->port:SIP_PORT;
		}else{
			LM_DBG("using via host\n");
			name=&(via->host);
			if (port==0) port=via->port;
		}
	}
	LM_DBG("trying SRV lookup\n");
	he=sip_resolvehost(name, &port, &via->proto, 0, 0);

	if (he==0){
		LM_NOTICE("resolve_host(%.*s) failure\n", name->len, name->s);
		return -1;
	}

	hostent2su( to, he, 0, port);
	return 1;