Hi all,
Thanx for all your suggestions.
I have tried Martin's solution of the 'frame ' option, and found 9it to
be very simple to use. However, it can be quite time consuming and may
drop packets during a live capture > 15Mbps.
So, I wrote a simple pcap program to just do a string compare with the
supplied target pattern and the data at a user-input location in the
packet.
-----Original Message-----
From: ethereal-users-admin@xxxxxxxxxxxx
[mailto:ethereal-users-admin@xxxxxxxxxxxx] On Behalf Of
Alistair.McGlinchy@xxxxxxxxxxxxxxxxxxxxx
Sent: Thursday, May 08, 2003 2:40 AM
To: martin.visser@xxxxxx; teodarren@xxxxxxxxxxxxx;
ethereal-users@xxxxxxxxxxxx
Subject: RE: [Ethereal-users] searching for pattern in packets
Darren,
Martin's solution is good for this particular question, but in general I
often need to mung tethereal -x with the following hunk of perl
HTH
Alistair
# teth2txt.pl
# usage: tethereal -x [-r file.cap] | perl teth2txt.pl > out.txt
use strict;
# Use paragaphs as records
$/="\n\n";
my $summary;
while(<>) {
if (/^ *\d+\.\d+/) {
$summary=$_;
} elsif (
my @all_hex = map{split/ /} /
[\da-f]{3}0 # Three hex chars and an 0
\ {2} # Two spaces
(# Capture the hex code only
[\da-f]{2} # Two hex chars
(?:\ [\da-f]{2}) # followed by a
non-captured group of space and two hex chars
{0,15} # up to 15 more
times
)# End of hex code capture
\ {3,48} # Followed by (0*3 to
15*3)+3
spaces
[^\n]{0,16} # and up to 16 (non-\n)
chars
of decode
\n
/xsg) {
print $summary;
print @all_hex,"\n\n";
} else {
print STDERR "This text doesn't look right to me\n$_";
}
}
> -----Original Message-----
> From: Visser, Martin (Sydney) [mailto:martin.visser@xxxxxx]
> Sent: 07 May 2003 05:20
> To: darren; ethereal-users@xxxxxxxxxxxx
> Subject: RE: [Ethereal-users] searching for pattern in packets
>
>
> The command "tethereal -R 'frame[-2:]==08:10' " will display all
> frames that match your condition
>
> Martin Visser
> Network Consultant
> Technology & Infrastructure - Consulting & Integration
> HP Services
>
> 3 Richardson Place
> North Ryde, Sydney NSW 2113, Australia
> Phone *: +61-2-9022-1670 Mobile *: +61-411-254-513
> Fax 7: +61-2-9022-1800 E-mail * : martin.visserAThp.com
>
>
>
> -----Original Message-----
> From: darren [mailto:teodarren@xxxxxxxxxxxxx]
> Sent: Wednesday, 7 May 2003 1:28 PM
> To: ethereal-users@xxxxxxxxxxxx
> Subject: [Ethereal-users] searching for pattern in packets
>
>
> Hi all,
>
> I would like to check the last two bytes of every packet in
> one of my capture files for a particular pattern.
>
> i.e. i would like to know if the last two bytes in my packets
> contains 0x0810.
>
> Any good and efficient way to do this via tethereal or
> tcpdump in combination with grep?
>
> thanx in advance
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