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#!/usr/bin/perl
#
# Module: vyatta-op-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 execute op-mode commands for DNS forwarding
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use Getopt::Long;
use VyattaConfig;
use strict;
use warnings;
my $show_stats_output="";
my $show_nameservers_output="";
my $dnsmasq_log='/var/log/dnsmasq.log';
sub get_cache_stats {
my ($cache_size, $queries_forwarded, $queries_answered_locally, $entries_inserted, $entries_removed);
my $grepped_line = `grep 'cache size' $dnsmasq_log`;
my @split_line = split(/\s+/, $grepped_line);
my @temp_split = split(/,/, $split_line[6]);
$cache_size = $temp_split[0];
@temp_split = split(/\//, $split_line[7]);
$entries_removed = $temp_split[0];
$entries_inserted = $temp_split[1];
$grepped_line = `grep 'queries forwarded' $dnsmasq_log`;
@split_line = split(/\s+/, $grepped_line);
@temp_split = split(/,/, $split_line[6]);
$queries_forwarded = $temp_split[0];
$queries_answered_locally = $split_line[10];
$show_stats_output .= "----------------\n";
$show_stats_output .= "Cache statistics\n";
$show_stats_output .= "----------------\n";
$show_stats_output .= "Cache size: $cache_size\n";
$show_stats_output .= "Queries forwarded: $queries_forwarded\n";
$show_stats_output .= "Queries answered locally: $queries_answered_locally\n";
$show_stats_output .= "Total DNS entries inserted into cache: $entries_inserted\n";
$show_stats_output .= "DNS entries removed from cache before expiry: $entries_removed\n";
}
sub get_nameserver_stats {
$show_stats_output .= "\n---------------------\n";
$show_stats_output .= "Nameserver statistics\n";
$show_stats_output .= "---------------------\n";
my @grepped_lines = `grep ': server' $dnsmasq_log`;
foreach my $lines (@grepped_lines) {
my @each_line = split(/\s+/, $lines);
my $nameserver_word = $each_line[5];
my @nameserver_split = split(/#/, $nameserver_word);
my $nameserver = $nameserver_split[0];
my $queries_sent_word = $each_line[8];
my @queries_sent_split = split(/,/, $queries_sent_word);
my $queries_sent = $queries_sent_split[0];
my $queries_retried_failed = $each_line[12];
$show_stats_output .= "Server: $nameserver\nQueries sent: $queries_sent\nQueries retried or failed: $queries_retried_failed\n\n";
}
}
sub print_stats {
print $show_stats_output;
}
sub get_dns_nameservers {
my $vyatta_config = new VyattaConfig;
$vyatta_config->setLevel("service dns forwarding");
$vyatta_config->{_active_dir_base} = "/opt/vyatta/config/active/";
my $use_system_nameservers = $vyatta_config->existsOrig("system");
my @use_dhcp_nameservers = $vyatta_config->returnOrigValues("dhcp");
my @use_nameservers = $vyatta_config->returnOrigValues("name-server");
my @resolv_conf_nameservers = `grep "^nameserver" /etc/resolv.conf`;
my @dnsmasq_conf_nameservers = `grep "server=" /etc/dnsmasq.conf`;
my @dnsmasq_running = `ps ax | grep dnsmasq | grep -v grep`;
if (!(defined $use_system_nameservers) && (@use_dhcp_nameservers == 0) && (@use_nameservers == 0)) {
# no specific nameservers specified under DNS forwarding, so dnsmasq is getting nameservers from /etc/resolv.conf
if (! @resolv_conf_nameservers > 0){
$show_nameservers_output .= "No DNS servers present to forward queries to.\n";
if (! @dnsmasq_running > 0){
$show_nameservers_output .= "DNS forwarding has not been configured either.\n";
}
} else {
if (! @dnsmasq_running > 0){
$show_nameservers_output .= "\n**DNS forwarding has not been configured**\n\n";
}
$show_nameservers_output .= "-----------------------------------------------\n";
if ( @dnsmasq_running > 0){
$show_nameservers_output .= " Nameservers configured for DNS forwarding\n";
} else {
$show_nameservers_output .= " Nameservers NOT configured for DNS forwarding\n";
}
$show_nameservers_output .= "-----------------------------------------------\n";
foreach my $line (@resolv_conf_nameservers) {
my @split_line = split(/\s+/, $line);
my $nameserver = $split_line[1];
my $nameserver_via = "system";
if (@split_line > 2) {
my @dhclient_resolv_files = `ls /etc/resolv.conf.dhclient-new-*`;
foreach my $each_dhcp_resolv_conf (@dhclient_resolv_files) {
my @ns_dhclient_resolv=`grep "$nameserver\$" $each_dhcp_resolv_conf`;
if ( @ns_dhclient_resolv > 0) {
my @dhclient_file_array = split(/-/, $each_dhcp_resolv_conf);
$nameserver_via = $dhclient_file_array[2];
chomp $nameserver_via;
$nameserver_via = 'dhcp ' . $nameserver_via;
}
}
}
$show_nameservers_output .= "$nameserver available via '$nameserver_via'\n";
}
}
$show_nameservers_output .= "\n";
} else {
# nameservers specified under DNS forwarding, so dnsmasq getting nameservers from /etc/dnsmasq.conf
my @active_nameservers;
my $active_nameserver_count = 0;
$show_nameservers_output .= "-----------------------------------------------\n";
$show_nameservers_output .= " Nameservers configured for DNS forwarding\n";
$show_nameservers_output .= "-----------------------------------------------\n";
foreach my $line (@dnsmasq_conf_nameservers) {
my @split_line = split(/=/, $line);
my @nameserver_array = split(/\s+/, $split_line[1]);
my $nameserver = $nameserver_array[0];
$active_nameservers[$active_nameserver_count] = $nameserver;
$active_nameserver_count++;
my $nameserver_via = $nameserver_array[2];
if (@nameserver_array > 3){
my $dhcp_interface = $nameserver_array[3];
$show_nameservers_output .= "$nameserver available via '$nameserver_via $dhcp_interface'\n";
} else {
$show_nameservers_output .= "$nameserver available via '$nameserver_via'\n";
}
}
# then you need to get nameservers from /etc/resolv.conf that are not in dnsmasq.conf to show them as inactive
my $active_dnsmasq_nameserver;
my $output_inactive_nameservers = 0;
foreach my $resolv_conf_line (@resolv_conf_nameservers) {
my @resolv_conf_split_line = split(/\s+/, $resolv_conf_line);
my $resolv_conf_nameserver = $resolv_conf_split_line[1];
$active_dnsmasq_nameserver = 0;
my $resolv_nameserver_via = "system";
foreach my $dnsmasq_nameserver (@active_nameservers) {
if ($dnsmasq_nameserver eq $resolv_conf_nameserver) {
$active_dnsmasq_nameserver = 1;
}
}
if ($active_dnsmasq_nameserver == 0) {
if ($output_inactive_nameservers == 0){
$output_inactive_nameservers = 1;
$show_nameservers_output .= "\n-----------------------------------------------\n";
$show_nameservers_output .= " Nameservers NOT configured for DNS forwarding\n";
$show_nameservers_output .= "-----------------------------------------------\n";
}
if (@resolv_conf_split_line > 2) {
my @dhclient_resolv_files = `ls /etc/resolv.conf.dhclient-new-*`;
foreach my $each_dhcp_resolv_conf (@dhclient_resolv_files) {
chomp $each_dhcp_resolv_conf;
my @ns_dhclient_resolv=`grep "$resolv_conf_nameserver\$" $each_dhcp_resolv_conf`;
if ( @ns_dhclient_resolv > 0) {
my @dhclient_file_array = split(/-/, $each_dhcp_resolv_conf);
$resolv_nameserver_via = $dhclient_file_array[2];
chomp $resolv_nameserver_via;
$resolv_nameserver_via = 'dhcp ' . $resolv_nameserver_via;
}
}
}
$show_nameservers_output .= "$resolv_conf_nameserver available via '$resolv_nameserver_via'\n";
}
}
$show_nameservers_output .= "\n";
}
}
sub print_nameservers {
print $show_nameservers_output;
}
#
# main
#
my ($clear_cache, $clear_process, $show_statistics, $show_nameservers);
GetOptions("clear-cache!" => \$clear_cache,
"clear-process!" => \$clear_process,
"show-statistics!" => \$show_statistics,
"show-nameservers!" => \$show_nameservers);
if (defined $clear_cache) {
system("kill -1 `pidof dnsmasq`");
}
if (defined $clear_process) {
system("/etc/init.d/dnsmasq restart >&/dev/null");
}
if (defined $show_statistics) {
system("echo > /var/log/dnsmasq.log; kill -10 `pidof dnsmasq`");
get_cache_stats;
get_nameserver_stats;
print_stats;
}
if (defined $show_nameservers) {
get_dns_nameservers;
print_nameservers;
}
exit 0;
# end of file
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