Function build_local

modules/tm/t_msgbuilder.c:104–266

Build a local request based on a previous request; the only customers of this function are local ACK and local CANCEL */

   customers of this function are local ACK and local CANCEL
 */
char *build_local(struct cell *Trans,unsigned int branch,
	str *method, str *extra, struct sip_msg* rpl, unsigned int *len)
{
	char                *cancel_buf, *p, *via;
	unsigned int         via_len;
	struct hdr_field    *buf_hdrs;
	struct hdr_field    *hdr;
	struct sip_msg      *req;
	char branch_buf[MAX_BRANCH_PARAM_LEN];
	str branch_str;
	struct hostport hp;
	str from;
	str to;
	str cseq_n;
	str *cid = NULL;
	struct ua_client* uac = & TM_BRANCH( Trans, branch);

	req = Trans->uas.request;
	cseq_n = Trans->cseq_n;
	buf_hdrs = 0;

	if (rpl && rpl!=FAKED_REPLY) {
		/* take from and to hdrs from reply */
		to.s = rpl->to->name.s;
		to.len = rpl->to->len;
		from.s = rpl->from->name.s;
		from.len = rpl->from->len;
		if (req && req->msg_flags&FL_USE_UAC_CSEQ) {
			if ( extract_ftc_hdrs( uac->request.buffer.s,
				uac->request.buffer.len,0 ,0 ,
				&cseq_n ,0)!=0 ) {
				LM_ERR("build_local: failed to extract UAC hdrs\n");
				goto error;
			}
		}
	} else {
		to = Trans->to;
		from = Trans->from;
		if (req && req->msg_flags&(FL_USE_UAC_FROM|FL_USE_UAC_TO|FL_USE_UAC_CSEQ)) {
			if ( extract_ftc_hdrs( uac->request.buffer.s,
				uac->request.buffer.len,
				(req->msg_flags&FL_USE_UAC_FROM)?&from:0 ,
				(req->msg_flags&FL_USE_UAC_TO)?&to:0 ,
				(req->msg_flags&FL_USE_UAC_CSEQ)?&cseq_n:0 ,0)!=0 ) {
				LM_ERR("build_local: failed to extract UAC hdrs\n");
				goto error;
			}
		}
	}

	LM_DBG("using FROM=<%.*s>, TO=<%.*s>, CSEQ_N=<%.*s>\n",
		from.len,from.s , to.len,to.s , cseq_n.len,cseq_n.s);

	/* method, separators, version  */
	*len=SIP_VERSION_LEN + method->len + 2 /* spaces */ + CRLF_LEN;
	*len+=uac->uri.len;

	if (is_anycast(uac->request.dst.send_sock))