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detect sequence number rollover (bug #2887)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/v1-0@4286 65c4cc65-6c06-0410-ace0-fbb531ad65f3
1.0
Russell Bryant 21 years ago
parent e73c4e4a44
commit 1b05a4639d
1 changed files with 2 additions and 2 deletions
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4
rtp.c
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@ -469,14 +469,14 @@ struct ast_frame *ast_rtp_read(struct ast_rtp *rtp)
/* This is special in-band data that's not one of our codecs */ /* This is special in-band data that's not one of our codecs */
if (rtpPT.code == AST_RTP_DTMF) { if (rtpPT.code == AST_RTP_DTMF) {
/* It's special -- rfc2833 process it */ /* It's special -- rfc2833 process it */
if (rtp->lasteventseqn <= seqno) { if (rtp->lasteventseqn <= seqno || rtp->resp == 0 || (rtp->lasteventseqn >= 65530 && seqno <= 6)) {
f = process_rfc2833(rtp, rtp->rawdata + AST_FRIENDLY_OFFSET + hdrlen, res - hdrlen); f = process_rfc2833(rtp, rtp->rawdata + AST_FRIENDLY_OFFSET + hdrlen, res - hdrlen);
rtp->lasteventseqn = seqno; rtp->lasteventseqn = seqno;
} else f = NULL; } else f = NULL;
if (f) return f; else return &null_frame; if (f) return f; else return &null_frame;
} else if (rtpPT.code == AST_RTP_CISCO_DTMF) { } else if (rtpPT.code == AST_RTP_CISCO_DTMF) {
/* It's really special -- process it the Cisco way */ /* It's really special -- process it the Cisco way */
if (rtp->lasteventseqn <= seqno) { if (rtp->lasteventseqn <= seqno || rtp->resp == 0 || (rtp->lasteventseqn >= 65530 && seqno <= 6)) {
f = process_cisco_dtmf(rtp, rtp->rawdata + AST_FRIENDLY_OFFSET + hdrlen, res - hdrlen); f = process_cisco_dtmf(rtp, rtp->rawdata + AST_FRIENDLY_OFFSET + hdrlen, res - hdrlen);
rtp->lasteventseqn = seqno; rtp->lasteventseqn = seqno;
} else f = NULL; } else f = NULL;

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