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# Module: Zone.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) 2009 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Mohit Mehta
# Date: 2009
# Description: vyatta zone management
#
# **** End License ****
#
package Vyatta::Zone;
use Vyatta::Config;
use Vyatta::Misc;
use Vyatta::Interface;
use strict;
use warnings;
my $debug="false";
my $syslog="false";
my $logger = 'sudo logger -t zone.pm -p local0.warn --';
sub run_cmd {
my $cmd = shift;
my $error = system("$cmd");
if ($syslog eq "true") {
my $func = (caller(1))[3];
system("$logger [$func] [$cmd] = [$error]");
}
if ($debug eq "true") {
my $func = (caller(1))[3];
print "[$func] [$cmd] = [$error]\n";
}
return $error;
}
sub get_all_zones {
my $value_func = shift;
my $config = new Vyatta::Config;
return $config->$value_func("zone-policy zone");
}
sub get_zone_interfaces {
my ($value_func, $zone_name) = @_;
my $config = new Vyatta::Config;
return $config->$value_func("zone-policy zone $zone_name interface");
}
sub get_from_zones {
my ($value_func, $zone_name) = @_;
my $config = new Vyatta::Config;
return $config->$value_func("zone-policy zone $zone_name from");
}
sub get_firewall_ruleset {
my ($value_func, $zone_name, $from_zone, $firewall_type) = @_;
my $config = new Vyatta::Config;
return $config->$value_func("zone-policy zone $zone_name from $from_zone
firewall $firewall_type");
}
sub is_local_zone {
my ($value_func, $zone_name) = @_;
my $config = new Vyatta::Config;
return $config->$value_func("zone-policy zone $zone_name local-zone");
}
sub get_zone_default_policy {
my ($value_func, $zone_name) = @_;
my $config = new Vyatta::Config;
return $config->$value_func("zone-policy zone $zone_name default-policy");
}
sub rule_exists {
my ($command, $table, $chain_name, $target, $interface) = @_;
my $cmd =
"sudo $command -t $table -L " .
"$chain_name -v 2>/dev/null | grep \" $target \" ";
if (defined $interface) {
$cmd .= "| grep \" $interface \" ";
}
$cmd .= "| wc -l";
my $result = `$cmd`;
return $result;
}
sub get_zone_chain {
my ($value_func, $zone, $localout) = @_;
my $chain = "VZONE_$zone";
if (defined(is_local_zone($value_func, $zone))) {
# local zone
if (defined $localout) {
# local zone out chain
$chain .= "_OUT";
} else {
# local zone in chain
$chain .= "_IN";
}
}
return $chain;
}
sub count_iptables_rules {
my ($command, $table, $chain) = @_;
my @lines = `sudo $command -t $table -L $chain -n --line`;
my $cnt = 0;
foreach my $line (@lines) {
$cnt++ if $line =~ /^\d/;
}
return $cnt;
}
sub validity_checks {
my @all_zones = get_all_zones("listNodes");
my @all_interfaces = ();
my $num_local_zones = 0;
my $returnstring;
foreach my $zone (@all_zones) {
# get all from zones, see if they exist in config, if not display error
my @from_zones = get_from_zones("listNodes", $zone);
foreach my $from_zone (@from_zones) {
if (scalar(grep(/^$from_zone$/, @all_zones)) == 0) {
$returnstring = "$from_zone is a from zone under zone $zone\n" .
"It is either not defined or deleted from config";
return ($returnstring, );
}
}
my @zone_intfs = get_zone_interfaces("returnValues", $zone);
if (scalar(@zone_intfs) == 0) {
# no interfaces defined for this zone
if (!defined(is_local_zone("exists", $zone))) {
$returnstring = "Zone $zone has no interfaces defined " .
"and it's not a local-zone";
return($returnstring, );
}
# zone defined as a local-zone
my @zone_intfs_orig = get_zone_interfaces("returnOrigValues", $zone);
if (scalar(@zone_intfs_orig) != 0) {
# can't change change transit zone to local-zone on the fly
$returnstring = "Zone $zone is a transit zone. " .
"Cannot convert it to local-zone.\n" .
"Please define another zone to create local-zone";
return($returnstring, );
}
$num_local_zones++;
# make sure only one zone is a local-zone
if ($num_local_zones > 1) {
return ("Only one zone can be defined as a local-zone", );
}
} else {
# zone has interfaces, make sure it is not set as a local-zone
if (defined(is_local_zone("exists", $zone))) {
$returnstring = "local-zone cannot have interfaces defined";
return($returnstring, );
}
# make sure you're not converting local-zone to transit zone either
if (defined(is_local_zone("existsOrig", $zone))) {
$returnstring = "Cannot convert local-zone $zone to transit zone" .
"\nPlease define another zone for it";
return($returnstring, );
}
foreach my $interface (@zone_intfs) {
# make sure firewall is not applied to this interface
my $intf = new Vyatta::Interface($interface);
if ($intf) {
my $config = new Vyatta::Config;
$config->setLevel($intf->path());
if ($config->exists("firewall")) {
$returnstring =
"interface $interface has firewall configured, " .
"cannot be defined under a zone";
return($returnstring, );
}
}
# make sure an interface is not defined under two zones
if (scalar(grep(/^$interface$/, @all_interfaces)) > 0) {
return ("$interface defined under two zones", );
} else {
push(@all_interfaces, $interface);
}
}
}
}
return;
}
1;
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