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#!/usr/bin/perl
#
# Module: vyatta-tshark-interface-port.pl
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2006, 2007, 2008 Vyatta, Inc.
# All Rights Reserved.
#
# Author: John Southworth
# Date: Sept. 2011
# Description: run tshark on a given interface with options
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use strict;
use warnings;
use Getopt::Long;
sub check_if_interface_is_tsharkable {
my $interface = shift;
my @grep_tshark_interfaces = `/usr/bin/tshark -D | grep $interface`;
my $any_interface;
for my $count (0 .. $#grep_tshark_interfaces) {
my @temp = split(/ /,$grep_tshark_interfaces[$count]);
chomp $temp[1];
$grep_tshark_interfaces[$count] = $temp[1];
}
my $exact_match = 0;
for my $count (0 .. $#grep_tshark_interfaces) {
if ($grep_tshark_interfaces[$count] eq $interface) {
$exact_match = 1;
$any_interface = $grep_tshark_interfaces[$count];
}
}
if ($exact_match == 0 || $any_interface eq 'any') {
print "Unable to capture traffic on $interface\n";
exit 1;
}
}
my ($detail,$filter,$intf,$unlimited,$save,$files,$size);
#
# The size parameter can have one of the following
# unit suffixes:
#
# - [kK] KiB (1024 bytes)
# - [mM] MiB (1048576 bytes)
# - [gG] GiB (1073741824 bytes)
# - [tT] TiB (109951162778 bytes)
#
# Note: tshark's default size unit is KiB
sub parse_size {
my ( $name, $parm ) = @_;
my %mult = ('T' => 1073741824, 't' => 1073741824,
'G' => 1048576, 'g' => 1048576,
'M' => 1024, 'm' => 1024,
'K' => 1, 'k' => 1);
die "Invalid parameter: $name" if ($name ne "size");
my ( $value, $unit ) = $parm =~ m/^([0-9]+)([kKmMgGtT])?$/;
die "Invalid size specified" unless $value;
$unit = "K" unless $unit;
$size = $value * $mult{$unit};
}
#
# main
#
my $result = GetOptions("detail!" => \$detail,
"filter=s" => \$filter,
"save=s" => \$save,
"intf=s" => \$intf,
"unlimited!" => \$unlimited,
"files=i" => \$files,
"size=s" => \&parse_size);
if (! $result) {
print "Invalid option specifications\n";
exit 1;
}
check_if_interface_is_tsharkable($intf);
if (defined($save)){
if (!($save =~ /.*\.pcap/)) {
print("Please name your file <filename>.pcap\n");
exit 1;
}
my $options = "";
# the CLI will make sure that files is not defined w/o size also
$options .= " -a filesize:$size" if defined($size);
$options .= " -b files:$files" if defined($files);
exec "/usr/bin/tshark -i $intf -w '$save' $options";
exit 0;
}
if (defined($filter)) {
if (defined($detail)) {
if (defined($unlimited)){
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf -V $filter 2> /dev/null";
} else {
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf -c 1000 -V $filter 2> /dev/null";
}
} elsif (defined($unlimited)) {
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf $filter 2> /dev/null";
} else {
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf -c 1000 $filter 2> /dev/null";
}
} elsif (defined($detail)) {
if (defined($unlimited)) {
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf -V 2> /dev/null";
} else {
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf -c 1000 -V 2> /dev/null";
}
} elsif (defined($unlimited)) {
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf 2> /dev/null";
} else {
print "Capturing traffic on $intf ...\n";
exec "/usr/bin/tshark -n -i $intf -c 1000 2> /dev/null";
}
exit 0;
#end of file
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