Function ospGetNextHop

modules/osp/sipheader.c:1551–1614

* Get next hop using the first Route not generated by this proxy or URI from the Request-Line * param msg SIP message * param nexthop Next hop IP * param bufsize Size of nexthop * return 0 success, -1 failure */

 * return 0 success, -1 failure
 */
int ospGetNextHop(
    struct sip_msg* msg,
    char* nexthop,
    int bufsize)
{
    struct hdr_field* hf;
    struct sip_uri uri;
    rr_t* rt;
    int found = 0;
    int result = -1;

    if ((nexthop != NULL) && (bufsize > 0)) {
        result = 0;

        for (hf = msg->headers; hf; hf = hf->next) {
            if (hf->type == HDR_ROUTE_T) {
                for (rt = (rr_t*)hf->parsed; rt; rt = rt->next) {
                    if (parse_uri(rt->nameaddr.uri.s, rt->nameaddr.uri.len, &uri) == 0) {
                        LM_DBG("host '%.*s' port '%d'\n", uri.host.len, uri.host.s, uri.port_no);

                        if (check_self(&uri.host, uri.port_no ? uri.port_no : SIP_PORT, PROTO_NONE) != 1) {
                            LM_DBG("it is NOT me, FOUND!\n");

                            if (uri.port_no != 0) {
                                snprintf(nexthop, bufsize, "%.*s:%d", uri.host.len, uri.host.s, uri.port_no);
                            } else {
                                ospCopyStrToBuffer(&uri.host, nexthop, bufsize);
                            }
                            found = 1;
                            break;
                        } else {
                            LM_DBG("it IS me, keep looking\n");
                        }
                    } else {
                        LM_ERR("failed to parse route uri '%.*s'\n",
                            rt->nameaddr.uri.len,
                            rt->nameaddr.uri.s);
                    }
                }
                if (found == 1) {
                    break;
                }
            }
        }

        if (!found) {
            LM_DBG("using the Request-Line instead host '%.*s' port '%d'\n",
                 msg->parsed_uri.host.len,
                 msg->parsed_uri.host.s,
                 msg->parsed_uri.port_no);

            if (msg->parsed_uri.port_no != 0) {
                snprintf(nexthop, bufsize, "%.*s:%d", msg->parsed_uri.host.len, msg->parsed_uri.host.s, msg->parsed_uri.port_no);
            } else {
                ospCopyStrToBuffer(&msg->parsed_uri.host, nexthop, bufsize);
            }
            found = 1;
        }