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#
# Module: Vyatta::IpTables::Mgr.pm
#
# **** 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) 2010 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Stig Thormodsrud
# Date: June 2010
# Description: common iptables routines
#
# **** End License ****
#
package Vyatta::IpTables::Mgr;
use strict;
use warnings;
use base 'Exporter';
our @EXPORT = qw(ipt_find_chain_rule ipt_enable_conntrack
ipt_disable_conntrack count_iptables_rules
chain_referenced ipt_get_queue_target);
sub ipt_find_chain_rule {
my ($iptables_cmd, $table, $chain, $search) = @_;
my ($num, $chain2) = (undef, undef);
my $cmd = "$iptables_cmd -t $table -L $chain -vn --line";
my @lines = `$cmd 2> /dev/null | egrep ^[0-9]`;
if (scalar(@lines) < 1) {
return;
}
foreach my $line (@lines) {
($num, undef, undef, $chain2) = split /\s+/, $line;
last if $chain2 eq $search;
($num, $chain2) = (undef, undef);
}
return $num if defined $num;
return;
}
my %conntrack_hook_hash =
('PREROUTING' => 'VYATTA_CT_PREROUTING_HOOK',
'OUTPUT' => 'VYATTA_CT_OUTPUT_HOOK',
);
sub ipt_enable_conntrack {
my ($iptables_cmd, $chain) = @_;
system("$iptables_cmd -t raw -L $chain -n >& /dev/null");
if ($? >> 8) {
# chain does not exist yet. set up conntrack.
system("$iptables_cmd -t raw -N $chain");
system("$iptables_cmd -t raw -A $chain -j ACCEPT");
foreach my $label ('PREROUTING', 'OUTPUT') {
my $index;
my $conntrack_hook = $conntrack_hook_hash{$label};
$index = ipt_find_chain_rule($iptables_cmd, 'raw',
$label, $conntrack_hook);
if (! defined($index)) {
print "Error: unable to find [$label] [$conntrack_hook]\n";
return 1;
}
$index++;
system("$iptables_cmd -t raw -I $label $index -j $chain");
}
}
return 0;
}
sub ipt_disable_conntrack {
my ($iptables_cmd, $chain) = @_;
my @lines;
foreach my $label ('PREROUTING', 'OUTPUT') {
my $index;
my $conntrack_hook = $conntrack_hook_hash{$label};
$index = ipt_find_chain_rule($iptables_cmd, 'raw',
$label, $chain);
if (! defined($index)) {
print "Error: ipt_disable_conntrack failed to find "
. "[$label][$chain]\n";
return 1;
}
system("$iptables_cmd -t raw -D $label $index");
}
system("$iptables_cmd -t raw -F $chain >& /dev/null");
system("$iptables_cmd -t raw -X $chain >& /dev/null");
return 0;
}
my %queue_target_hash =
('SNORT' => 'NFQUEUE --queue-num 0',
'VG_HTTPS' => 'NFQUEUE --queue-num 1',
);
sub ipt_get_queue_target {
my ($app) = @_;
my $target = $queue_target_hash{$app};
return $target;
}
sub count_iptables_rules {
my ($iptables_cmd, $table, $chain) = @_;
my $cmd = "$iptables_cmd -t $table -L $chain -n --line";
my @lines = `sudo $cmd 2> /dev/null`;
my $cnt = 0;
foreach my $line (@lines) {
$cnt++ if $line =~ /^\d/;
}
return $cnt;
}
sub chain_referenced {
my ( $table, $chain, $iptables_cmd ) = @_;
my $cmd = "$iptables_cmd -t $table -n -L $chain";
my $line = `$cmd 2>/dev/null |head -n1`;
chomp $line;
my $found = 0;
if ( $line =~ m/^Chain $chain \((\d+) references\)$/ ) {
if ( $1 > 0 ) {
$found = 1;
}
}
return $found;
}
1;
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