Function t_uac

modules/tm/uac.c:413–663

* Send a request using data from the dialog structure */

 * Send a request using data from the dialog structure
 */
int t_uac(str* method, str* headers, str* body, dlg_t* dialog,
				transaction_cb cb, void* cbp,release_tmcb_param release_func)
{
	union sockaddr_union to_su;
	struct cell *new_cell;
	struct retr_buf *request;
	struct sip_msg *req = NULL;
	char *buf_req = NULL;
	struct usr_avp **backup;
	char *buf;
	int buf_len;
	int ret, flags;
	unsigned int hi, method_id;
	struct proxy_l *proxy;
	struct tm_callback *it;
	struct ua_client* uac;

	ret=-1;

	/*** added by dcm
	 * - needed by external ua to send a request within a dlg
	 */
	if(!dialog->hooks.next_hop && w_calculate_hooks(dialog)<0)
		goto error_out;

	if(dialog->obp.s)
		dialog->hooks.next_hop = &dialog->obp;

	LM_DBG("next_hop=<%.*s>\n",dialog->hooks.next_hop->len,
			dialog->hooks.next_hop->s);

	/* calculate the socket corresponding to next hop ; here we take
	 * into consideration the protocol forced by the "send_sock" */
	proxy = uri2proxy( dialog->hooks.next_hop,
		dialog->send_sock ? dialog->send_sock->proto : PROTO_NONE );
	if (proxy==0)  {
		ret=E_BAD_ADDRESS;
		goto error_out;
	}
	/* use the first address */
	hostent2su( &to_su,
		&proxy->host, proxy->addr_idx, proxy->port ? proxy->port:SIP_PORT);

	/* check/discover the send socket */
	if (dialog->send_sock) {
		/* if already set, the protocol of send sock must have the 
		   the same type as the proto required by destination URI */
		if (proxy->proto != dialog->send_sock->proto)
			dialog->send_sock = NULL;
	}
	if (dialog->send_sock==NULL) {
		if (dialog->pref_sock && proxy->proto == dialog->pref_sock->proto) {
			dialog->send_sock = dialog->pref_sock;
		} else {
			/* get the send socket */
			dialog->send_sock = get_send_socket(NULL/*msg*/, &to_su,
				proxy->proto);
			if (!dialog->send_sock) {