Make sure we don't accept streams we can't handle (bug #3818)

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@5224 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 34 insertions, 19 deletions

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 152efe562..c00510718 100755
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -2795,8 +2795,8 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req)
 	char host[258];
 	char iabuf[INET_ADDRSTRLEN];
 	int len = -1;
-	int portno=0;
-	int vportno=0;
+	int portno = -1;
+	int vportno = -1;
 	int peercapability, peernoncodeccapability;
 	int vpeercapability=0, vpeernoncodeccapability=0;
 	struct sockaddr_in sin;
@@ -2839,8 +2839,10 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req)
 	sdpLineNum_iterator_init(&iterator);
 	ast_set_flag(p, SIP_NOVIDEO);	
 	while ((m = get_sdp_iterate(&iterator, req, "m"))[0] != '\0') {
+		int found = 0;
 		if ((sscanf(m, "audio %d RTP/AVP %n", &x, &len) == 1) ||
 		    (sscanf(m, "audio %d/%d RTP/AVP %n", &x, &y, &len) == 2)) {
+			found = 1;
 			portno = x;
 			/* Scan through the RTP payload types specified in a "m=" line: */
 			ast_rtp_pt_clear(p->rtp);
@@ -2862,6 +2864,7 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req)
 			ast_rtp_pt_clear(p->vrtp);  /* Must be cleared in case no m=video line exists */
 
 		if (p->vrtp && (sscanf(m, "video %d RTP/AVP %n", &x, &len) == 1)) {
+			found = 1;
 			ast_clear_flag(p, SIP_NOVIDEO);	
 			vportno = x;
 			/* Scan through the RTP payload types specified in a "m=" line: */
@@ -2879,6 +2882,12 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req)
 				while(*codecs && (*codecs < 33)) codecs++;
 			}
 		}
+		if (!found )
+			ast_log(LOG_WARNING, "Unknown SDP media type in offer: %s\n", m);
+	}
+	if (portno == -1 && vportno == -1) {
+		/* No acceptable offer found in SDP */
+		return -2;
 	}
 	/* Check for Media-description-level-address for audio */
 	if (pedanticsipchecking) {
@@ -2938,21 +2947,21 @@ static int process_sdp(struct sip_pvt *p, struct sip_request *req)
 	 */
 	sdpLineNum_iterator_init(&iterator);
 	while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
-      char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
-	  if (!strcasecmp(a, "sendonly")) {
-	  	sendonly=1;
-		continue;
-	  }
-	  if (!strcasecmp(a, "sendrecv")) {
-	  	sendonly=0;
-	  }
-	  if (sscanf(a, "rtpmap: %u %[^/]/", &codec, mimeSubtype) != 2) continue;
-	  if (debug)
-		ast_verbose("Found description format %s\n", mimeSubtype);
-	  /* Note: should really look at the 'freq' and '#chans' params too */
-	  ast_rtp_set_rtpmap_type(p->rtp, codec, "audio", mimeSubtype);
-	  if (p->vrtp)
-		  ast_rtp_set_rtpmap_type(p->vrtp, codec, "video", mimeSubtype);
+		char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
+		if (!strcasecmp(a, "sendonly")) {
+			sendonly=1;
+			continue;
+		}
+		if (!strcasecmp(a, "sendrecv")) {
+		  	sendonly=0;
+		}
+		if (sscanf(a, "rtpmap: %u %[^/]/", &codec, mimeSubtype) != 2) continue;
+		if (debug)
+			ast_verbose("Found description format %s\n", mimeSubtype);
+		/* Note: should really look at the 'freq' and '#chans' params too */
+		ast_rtp_set_rtpmap_type(p->rtp, codec, "audio", mimeSubtype);
+		if (p->vrtp)
+			ast_rtp_set_rtpmap_type(p->vrtp, codec, "video", mimeSubtype);
 	}
 
 	/* Now gather all of the codecs that were asked for: */
@@ -8273,8 +8282,11 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int
 		if (p->owner) {
 			/* Handle SDP here if we already have an owner */
 			if (!ast_strlen_zero(get_header(req, "Content-Type"))) {
-				if (process_sdp(p, req))
+				if (process_sdp(p, req)) {
+					transmit_response(p, "488 Not acceptable here", req);
+					ast_set_flag(p, SIP_NEEDDESTROY);	
 					return -1;
+				}
 			} else {
 				p->jointcapability = p->capability;
 				ast_log(LOG_DEBUG, "Hm....  No sdp for the moment\n");
@@ -8298,8 +8310,11 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int
 		}
 		/* Process the SDP portion */
 		if (!ast_strlen_zero(get_header(req, "Content-Type"))) {
-			if (process_sdp(p, req))
+			if (process_sdp(p, req)) {
+				transmit_response(p, "488 Not acceptable here", req);
+				ast_set_flag(p, SIP_NEEDDESTROY);	
 				return -1;
+			}
 		} else {
 			p->jointcapability = p->capability;
 			ast_log(LOG_DEBUG, "Hm....  No sdp for the moment\n");