https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6773
Summary: RTP dissector doesn't call subdissector for header
extensions
Product: Wireshark
Version: 1.7.x (Experimental)
Platform: x86
OS/Version: Windows 7
Status: NEW
Severity: Minor
Priority: Low
Component: TShark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: mdesharnais@xxxxxxxxxx
Created attachment 7733
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=7733
Capture file
Build Information:
Version 1.7.0custom_rtp_dissector_header_extension (SVN Rev Unknown from
unknown)
Copyright 1998-2011 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (32-bit) with GTK+ 2.22.1, with Cairo 1.10.2, with Pango 1.28.3, with
GLib 2.26.1, with WinPcap (version unknown), with libz 1.2.5, without POSIX
capabilities, with SMI 0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python,
with GnuTLS 2.10.3, with Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with
PortAudio V19-devel (built Jan 25 2012), with AirPcap.
Running on 64-bit Windows 7, build 7600, with WinPcap version 4.1.2 (packet.dll
version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b (20091008),
GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.
Built using Microsoft Visual C++ 10.0 build 40219
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
In RTP dissector, there is a problem analyzing header extensions. Registered
subdissector is not call.
I investigated a little and found that, in packet-rtp.c (function
dissect_rtp()), rtp_info->info_payload_type_str is null. It is suppose to be
fill with encoding name extract from p_conv_data->rtp_dyn_payload. The problem
is that it is a null pointer.
I joined the capture file I use to debug that. The payload type is received in
frame #69 and it's frame #81 which is suppose to use this information to, call
header extension subdissector.
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