misc/175645: tcpdump incorrectly decodes pflog'ged UDP packet as ATALK

[Gleb Smirnoff]

The following reply was made to PR bin/175645; it has been noted by GNATS.

From: Gleb Smirnoff <glebius at FreeBSD.org>
To: Dmitry Dvoinikov <dmitry at targeted.org>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: misc/175645: tcpdump incorrectly decodes pflog'ged UDP packet as
 ATALK
Date: Wed, 30 Jan 2013 14:15:11 +0400

 On Mon, Jan 28, 2013 at 09:09:27AM +0000, Dmitry Dvoinikov wrote:
 D> >Environment:
 D> FreeBSD foo 8.3-RELEASE-p5 FreeBSD 8.3-RELEASE-p5 #1: Wed Dec 12 23:29:24 YEKT 2012     admin at foo:/opt/obj/opt/src/sys/FOO  i386
 D> >Description:
 D> Some UDP packet, saved by pflog, is decoded incorrectly as ATALK.
 D> 
 D> tcpdump output:
 D> 
 D> # tcpdump -r packet.pcap 
 D> reading from file packet.pcap, link-type PFLOG (OpenBSD pflog file)
 D> 11:22:11.296532 IP 115.61.0.254 > 143.12.228.91: at-#100 5
 D> 
 D> whereas the (presumably correct) wireshark output:
 D> 
 D> Frame 1: 110 bytes on wire (880 bits), 110 bytes captured (880 bits)
 D> PF Log IPv4 pass on ifc by rule 0
 D> Internet Protocol Version 4, Src: 172.30.0.11 (172.30.0.11), Dst: 193.120.212.22 (193.120.212.22)
 D> User Datagram Protocol, Src Port: 55573 (55573), Dst Port: 16605 (16605)
 D> Data (18 bytes)
 D> 
 D> 
 D> >How-To-Repeat:
 D> openssl base64 -d > packet.pcap << EOF
 D> 1MOyoQIABAAAAAAAAAAAAHQAAAB1AAAAAwsGUVSGBABuAAAAbgAAAD0CAABpZmMA
 D> AAAAAAAAAAAAAAAAYW5jaG9yX25hbWUAAAAAAAAAABwAAAAC/////6CGAQAAAAAA
 D> ggUAAAEAAABFAAAuAABAAEAR+QasHgALwXjUFtkVQN0AGrhGUxUCmI8Mcz3kAFv+
 D> ZGyAi27Z
 D> EOF
 
 Was this packet recorded on FreeBSD or on OpenBSD system?
 
 -- 
 Totus tuus, Glebius.