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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 Vyatta::Config;
use Vyatta::Misc;
use Getopt::Long;
use strict;
use warnings;
my $dnsforwarding_init = '/etc/init.d/dnsmasq';
my $dnsforwarding_conf = '/etc/dnsmasq.conf';
sub dnsforwarding_restart {
system("$dnsforwarding_init restart >&/dev/null");
}
sub dnsforwarding_stop {
system("$dnsforwarding_init stop >&/dev/null");
}
sub dnsforwarding_get_constants {
my $output;
my $date = `date`;
chomp $date;
$output = "#\n# autogenerated by vyatta-dns-forwarding.pl on $date\n#\n";
$output .= "log-facility=/var/log/dnsmasq.log\n";
$output .= "no-poll\n";
$output .= "edns-packet-max=4096\n";
system("rm -f /var/log/dnsmasq.log; touch /var/log/dnsmasq.log");
return $output;
}
sub dnsforwarding_get_values {
my $outside_cli = shift;
my $output = '';
my $config = new Vyatta::Config;
my $use_dnsmasq_conf = 0;
my (@listen_interfaces, $cache_size, @use_nameservers, $use_system_nameservers, @use_dhcp_nameservers);
$config->setLevel("service dns forwarding");
if ($outside_cli == 1){
@listen_interfaces = $config->returnOrigValues("listen-on");
$cache_size = $config->returnOrigValue("cache-size");
@use_nameservers = $config->returnOrigValues("name-server");
$use_system_nameservers = $config->existsOrig("system");
@use_dhcp_nameservers = $config->returnOrigValues("dhcp");
} else {
@listen_interfaces = $config->returnValues("listen-on");
$cache_size = $config->returnValue("cache-size");
@use_nameservers = $config->returnValues("name-server");
$use_system_nameservers = $config->exists("system");
@use_dhcp_nameservers = $config->returnValues("dhcp");
}
if (@listen_interfaces != 0) {
foreach my $interface (@listen_interfaces) {
$output .= "interface=$interface\n";
}
}
if (defined $cache_size) {
$output .= "cache-size=$cache_size\n";
}
if (@use_nameservers != 0){
$use_dnsmasq_conf = 1;
foreach my $cli_nameserver (@use_nameservers) {
$output .= "server=$cli_nameserver\t# statically configured\n";
}
}
if (defined($use_system_nameservers)) {
$use_dnsmasq_conf = 1;
my $sys_config = new Vyatta::Config;
$sys_config->setLevel("system");
my @system_nameservers;
if ($outside_cli == 1){
@system_nameservers = $sys_config->returnOrigValues("name-server");
} else {
@system_nameservers = $sys_config->returnValues("name-server");
}
if (@system_nameservers > 0) {
foreach my $system_nameserver (@system_nameservers) {
$output .= "server=$system_nameserver\t# system\n";
}
}
}
if (@use_dhcp_nameservers != 0) {
$use_dnsmasq_conf = 1;
foreach my $interface (@use_dhcp_nameservers) {
my $dhcp_nameserver_count=`grep nameserver /etc/resolv.conf.dhclient-new-$interface 2>/dev/null | wc -l`;
if ($dhcp_nameserver_count > 0) {
my @dhcp_nameservers = `grep nameserver /etc/resolv.conf.dhclient-new-$interface`;
for my $each_nameserver (@dhcp_nameservers) {
my @nameserver = split(/ /, $each_nameserver, 2);
my $ns = $nameserver[1];
chomp $ns;
$output .= "server=$ns\t# dhcp $interface\n";
}
}
}
}
if ($use_dnsmasq_conf == 1) {
$output .= "resolv-file=/etc/dnsmasq.conf\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 = `cat /etc/resolv.conf 2>/dev/null | awk {'print \$1'} | grep \^nameserver\$ | wc -l`;
return $cmd;
}
sub check_system_nameserver {
my $config = new Vyatta::Config;
$config->setLevel("system");
my @system_nameservers = $config->returnValues("name-server");
return(@system_nameservers);
}
sub check_dhcp_interface {
my $interface = shift;
die "DNS forwarding error: $interface is not using DHCP to get an IP address\n"
unless Vyatta::Misc::is_dhcp_enabled($interface);
if (-e "/var/run/vyatta/dhclient/dhclient_release_$interface") {
# dhcp released for the interface
print "DNS forwarding warning: DHCP lease for $interface has been released by user\n";
}
return 1;
}
#
# main
#
my ($update_dnsforwarding, $stop_dnsforwarding, $system_nameserver, $dhcp_interface, $outside_cli);
GetOptions("update-dnsforwarding!" => \$update_dnsforwarding,
"stop-dnsforwarding!" => \$stop_dnsforwarding,
"system-nameserver!" => \$system_nameserver,
"outside-cli!" => \$outside_cli,
"dhcp-interface=s" => \$dhcp_interface);
if (defined $system_nameserver) {
my $system_nameserver_exists = check_system_nameserver();
if ($system_nameserver_exists < 1){
print "DNS forwarding warning: No name-servers set under 'system name-server'\n";
}
}
if (defined $dhcp_interface) {
if (!check_dhcp_interface($dhcp_interface)){
exit 1;
}
}
if (defined $update_dnsforwarding) {
my $config;
my $vyatta_config = new Vyatta::Config;
$vyatta_config->setLevel("service dns forwarding");
my $use_system_nameservers = $vyatta_config->exists("system");
my @use_dhcp_nameservers = $vyatta_config->returnValues("dhcp");
my @use_nameservers = $vyatta_config->returnValues("name-server");
if (!(defined $use_system_nameservers) && (@use_dhcp_nameservers == 0) && (@use_nameservers == 0)) {
my $nameserver_exists = check_nameserver();
if ($nameserver_exists < 1){
print "DNS forwarding warning: Currently, no name-servers to forward DNS queries\n";
}
}
my $called_from_outside_cli = 0;
if (defined $outside_cli){
$called_from_outside_cli = 1;
}
$config = dnsforwarding_get_constants();
$config .= dnsforwarding_get_values($called_from_outside_cli);
dnsforwarding_write_file($config);
dnsforwarding_restart();
}
if (defined $stop_dnsforwarding) {
dnsforwarding_stop();
}
exit 0;
# end of file
|
