diff options
Diffstat (limited to 'channels')
| -rw-r--r-- | channels/chan_sip.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/channels/chan_sip.c b/channels/chan_sip.c index 327cd9cbe..de292929b 100644 --- a/channels/chan_sip.c +++ b/channels/chan_sip.c @@ -6889,6 +6889,63 @@ static int find_sdp(struct sip_request *req) return FALSE; } +enum media_type { + SDP_AUDIO, + SDP_VIDEO, +}; + +static int get_ip_and_port_from_sdp(struct sip_request *req, const enum media_type media, struct sockaddr_in *sin) +{ + const char *m; + const char *c; + int miterator = req->sdp_start; + int citerator = req->sdp_start; + int x = 0; + int numberofports; + int len; + char host[258] = ""; /*Initialize to empty so we will know if we have any input */ + struct ast_hostent audiohp; + struct hostent *hp; + + c = get_sdp_iterate(&citerator, req, "c"); + if (sscanf(c, "IN IP4 %256s", host) != 1) { + ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c); + /* Continue since there may be a valid host in a c= line specific to the audio stream */ + } + /* We only want the m and c lines for audio */ + while ((m = get_sdp_iterate(&miterator, req, "m"))) { + if ((media == SDP_AUDIO && ((sscanf(m, "audio %d/%d RTP/AVP %n", &x, &numberofports, &len) == 2 && len > 0) || + (sscanf(m, "audio %d RTP/AVP %n", &x, &len) == 1 && len > 0))) || + (media == SDP_VIDEO && ((sscanf(m, "video %d/%d RTP/AVP %n", &x, &numberofports, &len) == 2 && len > 0) || + (sscanf(m, "video %d RTP/AVP %n", &x, &len) == 1 && len > 0)))) { + /* See if there's a c= line for this media stream. + * XXX There is no guarantee that we'll be grabbing the c= line for this + * particular media stream here. However, this is the same logic used in process_sdp. + */ + c = get_sdp_iterate(&citerator, req, "c"); + if (!ast_strlen_zero(c)) { + sscanf(c, "IN IP4 %256s", host); + } + break; + } + } + + if (ast_strlen_zero(host) || x == 0) { + ast_log(LOG_WARNING, "Failed to read an alternate host or port in SDP. Expect %s problems\n", media == SDP_AUDIO ? "audio" : "video"); + return -1; + } + + hp = ast_gethostbyname(host, &audiohp); + if (!hp) { + ast_log(LOG_WARNING, "Could not look up IP address of alternate hostname. Expect %s problems\n", media == SDP_AUDIO? "audio" : "video"); + return -1; + } + + memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr)); + sin->sin_port = htons(x); + return 0; +} + /*! \brief Process SIP SDP offer, select formats and activate RTP channels If offer is rejected, we will not change any properties of the call Return 0 on success, a negative value on errors. @@ -18030,6 +18087,21 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int } else { /* We already have a pending invite. Sorry. You are on hold. */ p->glareinvite = seqno; + if (p->rtp && find_sdp(req)) { + struct sockaddr_in sin; + if (get_ip_and_port_from_sdp(req, SDP_AUDIO, &sin)) { + ast_log(LOG_WARNING, "Failed to set an alternate media source on glared reinvite. Audio may not work properly on this call.\n"); + } else { + ast_rtp_set_alt_peer(p->rtp, &sin); + } + if (p->vrtp) { + if (get_ip_and_port_from_sdp(req, SDP_VIDEO, &sin)) { + ast_log(LOG_WARNING, "Failed to set an alternate media source on glared reinvite. Video may not work properly on this call.\n"); + } else { + ast_rtp_set_alt_peer(p->vrtp, &sin); + } + } + } transmit_response_reliable(p, "491 Request Pending", req); ast_debug(1, "Got INVITE on call where we already have pending INVITE, deferring that - %s\n", p->callid); /* Don't destroy dialog here */ |