Wireshark-bugs: [Wireshark-bugs] [Bug 4714] New: dns dissector on UDP packets influences tcp.str
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 26 Apr 2010 23:28:59 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4714

           Summary: dns dissector on UDP packets influences tcp.stream
           Product: Wireshark
           Version: 1.2.6
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: TShark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: alantu@xxxxxxxx


Created an attachment (id=4575)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=4575)
m.pcap contains the pcap to demonstrate this bug

Build Information:
TShark 1.2.6 (SVN Rev 31702)

Copyright 1998-2010 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 with GLib 2.22.3, with WinPcap (version unknown), with libz 1.2.3,
without POSIX capabilities, without libpcre, with SMI 0.4.8, with c-ares 1.7.0,
with Lua 5.1, with GnuTLS 2.8.5, with Gcrypt 1.4.5, with MIT Kerberos, with
GeoIP.

Running on Windows XP Service Pack 2, build 2600, with WinPcap version 4.1.1
(packet.dll version 4.1.0.1753), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.8.5, Gcrypt 1.4.5.

Built using Microsoft Visual C++ 9.0 build 30729

--
1.  Run
tshark -r m.pcap -w http.pcap -R "tcp"
http.pcap contains one TCP stream with a HTTP transaction.

2.  Run
tshark -r http.pcap -T fields -e tcp.stream

Result: tcp.stream is numbered 0.

3.  Run
tshark -r m.pcap -T fields -e tcp.stream -R "tcp"

Result: tcp.stream is numbered 1.

4.  Disable the dns dissector.

5.  Run
tshark -r m.pcap -T fields -e tcp.stream -R "tcp"

Result: tcp.stream is numbered 0.

The difference between m.pcap and http.pcap is that m.pcap contains two UDP DNS
packets, a query and response.

Bug or feature?
TCP streams should be numbered consistently, irrespective of the presence of
UDP DNS packets. It seems the dns dissector is causing the tcp.stream index to
be incremented.

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