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#!/usr/bin/perl
#
# Module: vyatta-update-dst-nat.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) 2009 Vyatta, Inc.
# All Rights Reserved.
#
# Author: eng@vyatta.com
# Date: 2011
# Description: Script to update iptables destination NAT rules
#
# **** End License ****
#
use strict;
use lib "/opt/vyatta/share/perl5/";
use Vyatta::Config;
use Vyatta::NatRuleCommon;
use Vyatta::DstNatRule;
use Vyatta::IpTables::Mgr;
my $CONFIG_LEVEL = "nat destination";
my $IPTABLES = "/sbin/iptables";
sub numerically { $a <=> $b; }
sub raw_cleanup {
# remove the conntrack setup.
ipt_disable_conntrack('iptables', 'NAT_CONNTRACK');
}
my $config = new Vyatta::Config;
my $all_deleted = 1;
$config->setLevel("nat source rule");
my %rules_src = $config->listNodeStatus();
my $rule_src;
for $rule_src (keys %rules_src) {
if ($rules_src{$rule_src} ne "deleted") {
$all_deleted = 0;
}
}
$config->setLevel($CONFIG_LEVEL." rule");
my %rules = $config->listNodeStatus();
my $rule;
my $debug = 0;
if ($debug) {
open(OUT, ">>/tmp/nat") or exit 1;
} else {
open(OUT, ">>/dev/null") or exit 1;
}
my $ipt_rulenum = 2;
my $chain_name = "PREROUTING";
print OUT "========= dst-nat list =========\n";
my @rule_keys = sort numerically keys %rules;
if ($#rule_keys < 0) {
raw_cleanup();
exit 0;
}
## it seems that "multiport" does not like port range (p1:p2) if nobody has
## touched the nat table yet after reboot!?
system("$IPTABLES -t nat -L -n >& /dev/null");
# we have some nat rule(s). make sure conntrack is enabled.
ipt_enable_conntrack('iptables', 'NAT_CONNTRACK');
for $rule (@rule_keys) {
print OUT "$rule: $rules{$rule}\n";
my $tmp = `iptables -L -nv --line -t nat`;
print OUT "iptables before:\n$tmp\n";
my $nrule = new Vyatta::DstNatRule;
$nrule->setup($CONFIG_LEVEL." rule $rule");
if ($rules{$rule} ne "deleted") {
$all_deleted = 0;
}
my $cmd;
if ($rules{$rule} eq "static") {
my $ipt_rules = $nrule->get_num_ipt_rules();
$ipt_rulenum += $ipt_rules;
next;
} elsif ($rules{$rule} eq "deleted") {
my $orule = new Vyatta::DstNatRule;
$orule->setupOrig($CONFIG_LEVEL." rule $rule");
my $ipt_rules = $orule->get_num_ipt_rules();
for (1 .. $ipt_rules) {
$cmd = "$IPTABLES -t nat -D $chain_name $ipt_rulenum";
print OUT "$cmd\n";
if (system($cmd)) {
exit 1;
}
}
next;
}
my ($err, @rule_strs) = $nrule->rule_str();
if (defined $err) {
# rule check failed => return error
print OUT "Destination NAT configuration error in rule $rule: $err\n";
print STDERR "Destination NAT configuration error in rule $rule: $err\n";
exit 5;
}
if ($rules{$rule} eq "added") {
foreach my $rule_str (@rule_strs) {
next if !defined $rule_str;
$cmd = "$IPTABLES -t nat -I $chain_name $ipt_rulenum " .
"$rule_str";
print OUT "$cmd\n";
if (system($cmd)) {
exit 1;
}
$ipt_rulenum++;
}
} elsif ($rules{$rule} eq "changed") {
# delete the old rule(s)
my $orule = new Vyatta::DstNatRule;
$orule->setupOrig($CONFIG_LEVEL." rule $rule");
my $ipt_rules = $orule->get_num_ipt_rules();
my $idx = $ipt_rulenum;
for (1 .. $ipt_rules) {
$cmd = "$IPTABLES -t nat -D $chain_name $idx";
print OUT "$cmd\n";
if (system($cmd)) {
exit 1;
}
}
# add the new rule(s)
foreach my $rule_str (@rule_strs) {
next if !defined $rule_str;
$cmd = "$IPTABLES -t nat -I $chain_name $ipt_rulenum " .
"$rule_str";
print OUT "$cmd\n";
if (system($cmd)) {
exit 1;
}
$ipt_rulenum++;
}
}
}
if ($all_deleted) {
raw_cleanup();
}
close OUT;
exit 0;
# Local Variables:
# mode: perl
# indent-tabs-mode: nil
# perl-indent-level: 2
# End:
|
