Function use_media_proxy

modules/mediaproxy/mediaproxy.c:1455–1744

ice_candidate_data: it carries data across the dialog when using engage_media_proxy: - priority: the priority that should be used for the ICE candidate -1: no candidate should be added. other: the specified type preference should be used for calculating - skip_next_reply: flag for knowing the fact that the next reply with SDP must be skipped because it is a reply to a re-INVITE or UPDATE *after* t

//   - skip_next_reply: flag for knowing the fact that the next reply with SDP must be skipped
//     because it is a reply to a re-INVITE or UPDATE *after* the ICE negotiation
static int
use_media_proxy(struct sip_msg *msg, char *dialog_id, ice_candidate_data *ice_data)
{
    str callid, cseq, from_uri, to_uri, from_tag, to_tag, user_agent;
    str signaling_ip, media_relay, sdp, str_buf, tokens[MAX_STREAMS+1];
    str priority_str, candidate;
    char request[8192], media_str[4096], buf[128], *result, *type;
    int i, j, port, len, status;
    Bool removed_session_ip, have_sdp;
    SessionInfo session;
    StreamInfo stream;

    if (msg == NULL)
        return -1;

    if (msg->first_line.type == SIP_REQUEST) {
        type = "request";
    } else if (msg->first_line.type == SIP_REPLY) {
        if (ice_data != NULL && ice_data->skip_next_reply) {
            // we don't process replies to ICE negotiation end requests
            // (those containing a=remote-candidates)
            ice_data->skip_next_reply = False;
            return -1;
        }
        type = "reply";
    } else {
        return -1;
    }

    if (get_callid(msg, &callid) < 0) {
        LM_ERR("failed to get Call-ID\n");
        return -1;
    }

    if (!get_cseq_number(msg, &cseq)) {
        LM_ERR("failed to get CSeq\n");
        return -1;
    }

    status = get_sdp_message(msg, &sdp);
    // status = -1 is error, -2 is missing SDP body
    if (status == -1 || (status == -2 && msg->first_line.type == SIP_REQUEST)) {
        return status;
    } else if (status == -2 && !(msg->REPLY_STATUS == 200 && get_method_from_reply(msg) == METHOD_INVITE)) {
        return -2;
    }
    have_sdp = (status == 1);

    if (have_sdp) {
        if (msg->first_line.type == SIP_REQUEST && find_line_starting_with(&sdp, "a=remote-candidates", False)) {
            // we don't process requests with a=remote-candidates, this indicates the end of an ICE
            // negotiation and we must not mangle the SDP.
            if (ice_data != NULL) {
                ice_data->skip_next_reply = True;
            }
            return -1;
        }