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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 $src_chain = "POSTROUTING";
my $dst_chain = "PREROUTING";
my $chain = undef;
# NAT CLI levels
my $src_level = "nat source rule";
my $dst_level = "nat destination rule";
my $level = undef;
my $iptables = "sudo /sbin/iptables";
sub numerically { $a <=> $b; }
sub get_nat_rules {
my $config = new Vyatta::Config;
$config->setLevel($level);
my @rules = sort numerically $config->listOrigNodes();
return @rules;
}
sub print_nat_rules {
my @rules = get_nat_rules();
my $rule_string = join(" ",@rules);
print $rule_string;
return;
}
sub clear_rule {
my $clirule = shift;
my $error = undef;
if ($clirule eq 'all') {
# clear counters for all rules in NAT table
$error = system("$iptables -Z -t nat &>/dev/null");
return "error clearing NAT rule counters" if $error;
} else {
# clear counters for a specific NAT rule
my @rules = get_nat_rules();
# validate that it's a legit CLI rule
if (!((scalar(grep(/^$clirule$/, @rules)) > 0))) {
return "Invalid NAT rule number \"$clirule\"";
}
my $config = new Vyatta::Config;
$config->setLevel($level);
# make sure rule is enabled
my $is_rule_disabled = $config->existsOrig("$clirule disable");
return "NAT rule $clirule is disabled" if defined $is_rule_disabled;
# find corresponding rulenum in the underlying NAT table
my $iptables_rule = undef;
my $cmd = "$iptables -L $chain -t nat -nv " .
"--line-numbers | grep '/\* .*NAT-$clirule' | awk {'print \$1'}";
$iptables_rule = `$cmd`;
return "couldn't find an underlying iptables rule" if ! defined $iptables_rule;
chomp $iptables_rule;
# Rules with "log" statement and "tcp_udp" rules take more than one line
my @numbers = split(/\n/, $iptables_rule);
# clear the counters for that rule
for my $number (@numbers) {
$cmd = "$iptables -t nat -Z $chain $number";
$error = system($cmd);
return "error clearing counters for NAT rule $clirule" if $error;
}
}
return;
}
#
# main
#
my ($action, $clirulenum, $type);
GetOptions( "action=s" => \$action,
"clirule=s" => \$clirulenum,
"type=s" => \$type
);
die "undefined action" if ! defined $action;
die "undefined rule number" if ! defined $clirulenum;
die "undefined NAT type" if ! defined $type;
if ($type eq 'source') {
$level = $src_level;
$chain = $src_chain;
} elsif ($type eq 'destination') {
$level = $dst_level;
$chain = $dst_chain;
} else {
die "unknown NAT type";
}
my ($error, $warning);
($error, $warning) = clear_rule($clirulenum) if $action eq 'clear-counters';
($error, $warning) = print_nat_rules() if $action eq 'print-nat-rules';
if (defined $warning) {
print "$warning\n";
}
if (defined $error) {
print "$error\n";
exit 1;
}
exit 0;
# end of file
|
