I am running Win7 and using Strawberry Perl. I am trying to use tshark (the tshark command works from the command line fine) and perl to 'dechunk' the 1 to 3 DIAMETER messages that can be included in a single TCP frame into separate rows in the output file. I get an 'tshark illegal command' message. The error I get is "tshark: An error occurred while printing packets: Invalid argument" This suggests the problem is the 'pipe' operator on line 41 - the '$tsharkcmd .= " -r $input |";' line since this is the only difference from executing the command manually. I cannot seem to find any information on what to replace this with so it will work on a Windows system. 

use strict;

#
# extract DIAMETER chunks into separate rows in a file for analysis
# this version for TCP based DIAMETER interfaces (SWx, STa, Gx, Gxa, S
+6b
#

my %columns = (
# frame
0=>"frame.time",
1=>"frame.number",
2=>"frame.len",
3=>"ip.src",
4=>"tcp.srcport",
5=>"ip.dst",
6=>"tcp.dstport",
# data
7=>"diameter.applicationId",
8=>"diameter.Session-Id",
9=>"diameter.Origin-Host",
10=>"diameter.Destination-Host",
11=>"diameter.User-Name",
12=>"diameter.cmd.code",
13=>"diameter.flags.request",
14=>"diameter.flags.T",
15=>"diameter.Result-Code",
);
print "Start: ", time(), "\n";
my $et = time();
my $framecounter;
my $chunkcounter;

# input and output files
my $input = $ARGV[0];
my $output = $input . ".txt";

my $tsharkcmd = q[c:/progra~1/wireshark/tshark.exe -n -2 -t e -T field
+s];
foreach (sort {$a <=> $b} keys %columns) {
    $tsharkcmd .= " -e $columns{$_}";
}
$tsharkcmd .= " -r $input |";
print "\n", $tsharkcmd, "\n\n";

# open filehandles
open OUT, ">$output" or die "cannot open $output: $!\n";
open TSHARK, $tsharkcmd or die "cannot open tshark: $!\n"; 

# dechunking starts here
# 

print "\nFinished: ", time(), "\n";
$et = time() - $et;
print "elapsed time: $et\n";
my $fps = $framecounter / $et;
my $cps = $chunkcounter / $et;
print "frames processed: $framecounter ($fps/sec)\n";
print "chunks processed: $chunkcounter ($cps/sec)\n";

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In reply to pipe operator for windows by paidcritic

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