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#!/usr/bin/perl -w
#
# Module: vyatta_update_resolv.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) 2007 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Marat Nepomnyashy
# Date: December 2007
# Description: Script to update '/etc/resolv.conf' on commit of 'system domain-search domain' config.
#
# **** End License ****
#
use strict;
use lib "/opt/vyatta/share/perl5/";
use Getopt::Long;
my $change_dir = '';
my $modify_dir = '';
GetOptions("change_dir=s" => \$change_dir, "modify_dir=s" => \$modify_dir);
use VyattaConfig;
my $vc = new VyattaConfig();
if ($change_dir ne '') {
$vc->{_changes_only_dir_base} = $change_dir;
}
if ($modify_dir ne '') {
$vc->{_new_config_dir_base} = $modify_dir;
}
$vc->setLevel('system');
my @domains = $vc->returnValues('domain-search domain');
my $domain_name = $vc->returnValue('domain-name');
if (@domains > 0 && $domain_name && length($domain_name) > 0) {
print STDERR "System configuration error. Both \'domain-name\' and \'domain-search\' are specified, but only one of these mutually exclusive parameters is allowed.\n";
print STDERR "System configuration commit aborted due to error(s).\n";
exit(1);
}
my $doms = '';
foreach my $domain (@domains) {
if (length($doms) > 0) {
$doms .= ' ';
}
$doms .= $domain;
}
my $search = '';
if (length($doms) > 0) {
$search = "search\t\t$doms\t\t#line generated by $0\n";
}
my $domain = '';
if ($domain_name && length($domain_name) > 0) {
$domain = "domain\t\t$domain_name\t\t#line generated by $0\n";
}
# The following will re-write '/etc/resolv.conf' line by line,
# replacing the 'search' specifier with the latest values,
# or replacing the 'domain' specifier with the latest value.
my @resolv;
if (-e '/etc/resolv.conf') {
open (RESOLV, '</etc/resolv.conf') or die("$0: Error! Unable to open '/etc/resolv.conf' for input: $!\n");
@resolv = <RESOLV>;
close (RESOLV);
}
my $foundSearch = 0;
my $foundDomain = 0;
open (RESOLV, '>/etc/resolv.conf') or die("$0: Error! Unable to open '/etc/resolv.conf' for output: $!\n");
foreach my $line (@resolv) {
if ($line =~ /^search\s/) {
$foundSearch = 1;
if (length($search) > 0) {
print RESOLV $search;
}
} elsif ($line =~ /^domain\s/) {
$foundDomain = 1;
if (length($domain) > 0) {
print RESOLV $domain;
}
} else {
print RESOLV $line;
}
}
if ($foundSearch == 0 && length($search) > 0) {
print RESOLV $search;
}
if ($foundDomain == 0 && length($domain) > 0) {
print RESOLV $domain;
}
close (RESOLV);
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