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#!/usr/bin/perl
#
# Module: vyatta-show-dhclient.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: Stig Thormodsrud
# Date: January 2008
# Description: Script to display dhcp client lease info
#
# **** End License ****
#
use lib "/opt/vyatta/share/perl5/";
use POSIX;
use strict;
use warnings;
my $lease_dir = '/var/lib/dhcp3';
sub dhclient_get_lease_files {
my ($intf) = @_;
my @lease_files;
if ( $intf eq "all" ) {
opendir( my $dh, $lease_dir ) or die "Can't open $lease_dir: $!";
@lease_files = grep { /^dhclient_.*_lease$/ } readdir($dh);
closedir $dh;
}
else {
my $file = 'dhclient_' . $intf . '_lease';
@lease_files = ($file) if -f "$lease_dir/$file";
}
return @lease_files;
}
sub dhclient_parse_vars {
my $file = shift;
open( my $f, '<', "$lease_dir/$file" )
or return;
my %var_list;
my $line;
$line = <$f>;
chomp $line;
$var_list{'last_update'} = $line;
while ( $line = <$f> ) {
chomp $line;
if ( $line =~ m/(\w+)=\'([\w\s.]+)\'/ ) {
my $var = $1;
my $val = $2;
$var_list{$var} = $val;
}
}
close $f;
return %var_list;
}
# Get current domain (if any) defined in resolv.conf
sub resolve_domain {
open( my $rc, '<', '/etc/resolv.conf' )
or return;
while (<$rc>) {
next unless m/^domain (\S+)/;
return $1;
}
}
sub dhclient_show_lease {
my ($file) = @_;
my %var_list = dhclient_parse_vars($file);
my $interface = $var_list{'interface'};
print "interface : $interface\n" if defined $interface;
my $new_ip_address = $var_list{'new_ip_address'};
if ($new_ip_address) {
print "ip address : $new_ip_address\t";
my $ip_active = `ip addr list $interface`;
if ( $ip_active =~ m/$new_ip_address/ ) {
print "[Active]\n";
}
else {
print "[Inactive]\n";
}
}
my $new_subnet_mask = $var_list{'new_subnet_mask'};
print "subnet mask: $new_subnet_mask\n" if defined $new_subnet_mask;
my $new_domain_name = $var_list{'new_domain_name'};
if ($new_domain_name) {
print "domain name: $new_domain_name";
my $cur_domain = resolve_domain();
print "\t[overridden by domain-name set using CLI]"
if ( defined $cur_domain && $cur_domain ne $new_domain_name );
print "\n";
}
my $new_routers = $var_list{'new_routers'};
print "router : $new_routers\n" if defined $new_routers;
my $new_domain_name_servers = $var_list{'new_domain_name_servers'};
print "name server: $new_domain_name_servers\n"
if defined $new_domain_name_servers;
my $new_dhcp_server_identifier = $var_list{'new_dhcp_server_identifier'};
print "dhcp server: $new_dhcp_server_identifier\n"
if defined $new_dhcp_server_identifier;
my $new_dhcp_lease_time = $var_list{'new_dhcp_lease_time'};
print "lease time : $new_dhcp_lease_time\n" if defined $new_dhcp_lease_time;
my $last_update = $var_list{'last_update'};
print "last update: $last_update\n" if defined $last_update;
my $new_expiry = $var_list{'new_expiry'};
my $new_expiry_str;
if ($new_expiry) {
$new_expiry_str =
strftime( "%a %b %d %R:%S %Z %Y", localtime($new_expiry) );
}
print "expiry : $new_expiry_str\n" if defined $new_expiry_str;
my $reason = $var_list{'reason'};
print "reason : $reason\n" if defined $reason;
print "\n";
}
#
# main
#
my $intf = 'all';
if ( $#ARGV >= 0 ) {
$intf = $ARGV[0];
}
my @dhclient_files = dhclient_get_lease_files($intf);
foreach my $file ( sort @dhclient_files ) {
dhclient_show_lease($file);
}
exit 0;
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