Function t_inject_branch

modules/tm/t_fwd.c:1130–1213

}

int t_inject_branch( struct cell *t, struct sip_msg *msg, int flags)
{
	static struct sip_msg faked_req;
	branch_bm_t cancel_bm = BRANCH_BM_ZERO;
	str reason = str_init(CANCEL_REASON_200);
	struct cell *bk_t = NULL;
	int rc;

	/* does the transaction state still accept new branches ? */
	if (t->uas.status >= 200) {
		LM_DBG("cannot add branches to a transaction with %d UAS\n",
			t->uas.status);
		return -2;
	}

	if (!fake_req( &faked_req, t->uas.request, &t->uas, NULL)) {
		LM_ERR("fake_req failed\n");
		return -1;
	}

	/* do we have the branches to be injected ? */
	if (flags&TM_INJECT_SRC_EVENT) {
		/* get the branch from Event AVPs, as populated by EVI/EBR */
		if (ul_contact_event_to_msg( &faked_req )<0) {
			LM_ERR("failed to grab new branch from Event\n");
			goto error;
		}
	} else {
		/* use the RURI+dset array as destinations to be injected */
		if (msg->first_line.type==SIP_REQUEST) {
			/* take the RURI branch from the script msg and move it
			 * into the faked msg (that will be used by t_fwd function) */
			if (dst_to_msg( msg, &faked_req )<0) {
				LM_ERR("failed to grab new branch from Event\n");
				goto error;
			}
		} else {
			/* current message is a reply, so take the first branch from dset
			 * and move it into the faked msg (that will be used by t_fwd 
			 * function)*/
			if (move_msg_branch_to_ruri( 0, &faked_req)<0) {
				LM_ERR("no branch found to be moved as new destination\n");
				goto error;
			}
			/* remove it from set */
			remove_msg_branch(0);
		}
	}

	/* t_forward_nonack() relies on T for various internal stuff, so be
	 * we advertise the correct one */
	bk_t = get_t();
	set_t( t );

	/* do we have to cancel the existing branches before injecting new ones? */
	if (flags&TM_INJECT_FLAG_CANCEL) {
		which_cancel( t, cancel_bm );
	}