Function build_uac_req

modules/tm/t_msgbuilder.c:773–898

* Create a request */

 * Create a request
 */
char* build_uac_req(str* method, str* headers, str* body, dlg_t* dialog,
										int branch, struct cell *t, int* len)
{
	char* buf, *w;
	str content_length, cseq, via, mf;
	str *cid = tm_via_cid();

	if (!method || !dialog) {
		LM_ERR("inalid parameter value\n");
		return 0;
	}
	if (print_content_length(&content_length, body) < 0) {
		LM_ERR("failed to print content-length\n");
		return 0;
	}
	if (print_cseq_num(&cseq, dialog) < 0) {
		LM_ERR("failed to print CSeq number\n");
		return 0;
	}
	*len = method->len + 1 + dialog->hooks.request_uri->len + 1 +
		SIP_VERSION_LEN + CRLF_LEN;

	if (assemble_via(&via, t, dialog->send_sock, branch, cid) < 0) {
		LM_ERR("failed to assemble Via\n");
		return 0;
	}
	*len += via.len;

	/* To */
	*len += TO_LEN
		+ (dialog->rem_dname.len ? dialog->rem_dname.len+1 : 0)
		+ dialog->rem_uri.len
		+ (dialog->id.rem_tag.len ? TOTAG_LEN + dialog->id.rem_tag.len : 0)
		+ 2 /* <> for URI */ + CRLF_LEN;
	/* From */
	*len += FROM_LEN
		+ (dialog->loc_dname.len ? dialog->loc_dname.len+1 : 0)
		+ dialog->loc_uri.len
		+ (dialog->id.loc_tag.len ? FROMTAG_LEN + dialog->id.loc_tag.len : 0)
		+ 2 /* <> for URI */ + CRLF_LEN;
	/* Call-ID */
	*len += CALLID_LEN + dialog->id.call_id.len + CRLF_LEN;
	/* CSeq */
	*len += CSEQ_LEN + cseq.len + 1 + method->len + CRLF_LEN;
	/* Route set */
	*len += calculate_routeset_length(dialog);
	/* Max-Forwards */
	if (dialog->mf_enforced) {
		mf.s = int2str( dialog->mf_value, &mf.len);
		*len += LOCAL_MAXFWD_PREFIX_LEN + mf.len + CRLF_LEN;
	} else {
		mf.len = 0; mf.s = NULL;
		*len += LOCAL_MAXFWD_HEADER_LEN;
	}
	/* Content-Length */
	*len += CONTENT_LENGTH_LEN + content_length.len + CRLF_LEN;
	/* Signature */
	*len += (server_signature ? (user_agent_header->len + CRLF_LEN) : 0);