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#!/usr/bin/perl
#
# Module: vyatta-dns-forwarding.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) 2008 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Mohit Mehta
# Date: August 2008
# Description: Script to glue Vyatta CLI to dnsmasq daemon
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use VyattaConfig;
use VyattaMisc;
use Getopt::Long;
use strict;
use warnings;
my $dnsforwarding_init = '/etc/init.d/dnsmasq';
my $dnsforwarding_conf = '/etc/dnsmasq.conf';
sub dnsforwarding_init {
}
sub dnsforwarding_restart {
system("$dnsforwarding_init restart >&/dev/null");
print "Setting up DNS forwarding.\n";
}
sub dnsforwarding_stop {
system("$dnsforwarding_init stop >&/dev/null");
print "Stopping DNS forwarding.\n";
}
sub dnsforwarding_get_constants {
my $output;
my $date = `date`;
chomp $date;
$output = "#\n# autogenerated by vyatta-dns-forwarding.pl on $date\n#\n";
return $output;
}
sub dnsforwarding_get_values {
my $output = '';
my $config = new VyattaConfig;
$config->setLevel("service dns forward");
my @ignore_interfaces = $config->returnValues("ignore-interface");
if ($#ignore_interfaces >= 0) {
foreach my $interface (@ignore_interfaces) {
$output .= "except-interface=$interface\n";
}
}
my $cache_size = $config->returnValue("cache-size");
if (defined $cache_size) {
$output .= "cache-size=$cache_size\n";
}
return $output;
}
sub dnsforwarding_write_file {
my ($config) = @_;
open(my $fh, '>', $dnsforwarding_conf) || die "Couldn't open $dnsforwarding_conf - $!";
print $fh $config;
close $fh;
}
sub check_nameserver {
my $cmd = `grep nameserver /etc/resolv.conf|wc -l`;
return $cmd;
}
#
# main
#
my $init_dnsforwarding;
my $update_dnsforwarding;
my $stop_dnsforwarding;
my $nameserver;
GetOptions("init-dnsforwarding!" => \$init_dnsforwarding,
"update-dnsforwarding!" => \$update_dnsforwarding,
"stop-dnsforwarding!" => \$stop_dnsforwarding,
"nameserver!" => \$nameserver);
if (defined $nameserver) {
my $nameserver_exists = check_nameserver();
if ($nameserver_exists < 1){
exit 1;
} else {
exit 0;
}
}
if (defined $init_dnsforwarding) {
dnsforwarding_init();
}
if (defined $update_dnsforwarding) {
my $config;
$config = dnsforwarding_get_constants();
$config .= dnsforwarding_get_values();
dnsforwarding_write_file($config);
dnsforwarding_restart();
}
if (defined $stop_dnsforwarding) {
dnsforwarding_stop();
}
exit 0;
# end of file
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