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#!/usr/bin/perl
#
# Module: vyatta-clear-nat-counters.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) 2006-2009 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Mohit Mehta
# Date: February 2010
# Description: Script to clear nat counters
#
# **** End License ****
#
use Getopt::Long;
use POSIX;
use warnings;
use strict;
use lib "/opt/vyatta/share/perl5";
use Vyatta::Config;
# NAT type mapping from config node to iptables chain
my %chain_hash = ( 'source' => 'POSTROUTING',
'destination' => 'PREROUTING',
'masquerade' => 'POSTROUTING');
sub clear_rule {
my $clirule = shift;
my $error = undef;
if ($clirule eq 'all') {
# clear counters for all rules in NAT table
$error = system("sudo /sbin/iptables -Z -t nat &>/dev/null");
return "error clearing NAT rule counters" if $error;
} else {
# clear counters for a specific NAT rule
my $config = new Vyatta::Config;
$config->setLevel("service nat rule");
my @rules = $config->listOrigNodes();
# validate that it's a legit CLI rule
if (!((scalar(grep(/^$clirule$/, @rules)) > 0))) {
return "Invalid NAT rule number \"$clirule\"";
}
# determine rule type
my $rule_type = $config->returnOrigValue("$clirule type");
# find corresponding rulenum in the underlying NAT table
my $iptables_rule = undef;
my $cmd = "sudo /sbin/iptables -L $chain_hash{$rule_type} -t nat -nv " .
"--line-numbers | grep '/\* NAT-$clirule ' | awk {'print \$1'}";
$iptables_rule = `$cmd`;
return "couldn't find an underlying iptables rule" if ! defined $iptables_rule;
chomp $iptables_rule;
# clear the counters for that rule
$cmd = "sudo /sbin/iptables -t nat -Z $chain_hash{$rule_type} $iptables_rule";
$error = system($cmd);
return "error clearing counters for NAT rule $clirule" if $error;
}
return;
}
#
# main
#
my ($clirulenum);
GetOptions("clirule=s" => \$clirulenum);
die "undefined rule number" if ! defined $clirulenum;
my ($error, $warning);
($error, $warning) = clear_rule($clirulenum);
if (defined $warning) {
print "$warning\n";
}
if (defined $error) {
print "$error\n";
exit 1;
}
exit 0;
# end of file
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