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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) = @_;
# todo: fix sorting for ethX > 9
my @lease_files;
my $LS;
if ($intf eq "all") {
my $file = "dhclient_";
open($LS,"ls $lease_dir |grep '^$file.*\_lease\$' | sort |");
} else {
my $file = "dhclient_$intf";
open($LS,"ls $lease_dir |grep '^$file\_lease\$' | sort |");
}
@lease_files = <$LS>;
close($LS);
foreach my $i (0 .. $#lease_files) {
$lease_files[$i] = "$lease_dir/$lease_files[$i]";
}
chomp @lease_files;
return @lease_files;
}
sub dhclient_parse_vars {
my ($file) = @_;
my %var_list;
if ( !(-f $file)) {
return %var_list;
}
open(FD, "<$file");
my $line;
$line = <FD>;
chomp $line;
$var_list{'last_update'} = $line;
while ($line = <FD>) {
chomp $line;
if ($line =~ m/(\w+)=\'([\w\s.]+)\'/) {
my $var = $1;
my $val = $2;
$var_list{$var} = $val;
}
}
close(FD);
return %var_list;
}
sub dhclient_show_lease {
my ($file) = @_;
my %var_list = dhclient_parse_vars($file);
my $last_update = $var_list{'last_update'};
my $reason = $var_list{'reason'};
my $interface = $var_list{'interface'};
my $new_expiry = $var_list{'new_expiry'};
my $new_dhcp_lease_time = $var_list{'new_dhcp_lease_time'};
my $new_ip_address = $var_list{'new_ip_address'};
my $new_broadcast_address = $var_list{'new_broadcast_address'};
my $new_subnet_mask = $var_list{'new_subnet_mask'};
my $new_domain_name = $var_list{'new_domain_name'};
my $new_network_number = $var_list{'new_network_number'};
my $new_domain_name_servers = $var_list{'new_domain_name_servers'};
my $new_routers = $var_list{'new_routers'};
my $new_dhcp_server_identifier = $var_list{'new_dhcp_server_identifier'};
my $new_dhcp_message_type = $var_list{'new_dhcp_message_type'};
my $old_ip_address = $var_list{'old_ip_address'};
my $old_subnet_mask = $var_list{'old_subnet_mask'};
my $old_domain_name = $var_list{'old_domain_name'};
my $old_domain_name_servers = $var_list{'old_domain_name_servers'};
my $old_routers = $var_list{'old_routers'};
my $new_expiry_str;
if (defined $new_expiry) {
$new_expiry_str = strftime("%a %b %d %R:%S %Z %Y",
localtime($new_expiry));
}
print "interface : $interface\n" if defined $interface;
if (defined $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";
}
}
print "subnet mask: $new_subnet_mask\n" if defined $new_subnet_mask;
if (defined $new_domain_name) {
print "domain name: $new_domain_name";
my $cli_domain_overrides = 0;
my $if_domain_exists = `grep domain /etc/resolv.conf 2> /dev/null | wc -l`;
if ($if_domain_exists > 0) {
my @domain = `grep domain /etc/resolv.conf`;
for my $each_domain_text_found (@domain) {
my @domain_text_split = split(/\t/, $each_domain_text_found, 2);
my $domain_at_start_of_line = $domain_text_split[0];
chomp $domain_at_start_of_line;
if ($domain_at_start_of_line eq "domain") {
$cli_domain_overrides = 1;
}
}
}
if ($cli_domain_overrides == 1) {
print "\t[overridden by domain-name set using CLI]\n";
} else {
print "\n";
}
}
print "router : $new_routers\n" if defined $new_routers;
print "name server: $new_domain_name_servers\n" if
defined $new_domain_name_servers;
print "dhcp server: $new_dhcp_server_identifier\n" if
defined $new_dhcp_server_identifier;
print "lease time : $new_dhcp_lease_time\n" if defined $new_dhcp_lease_time;
print "last update: $last_update\n" if defined $last_update;
print "expiry : $new_expiry_str\n" if defined $new_expiry_str;
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 $file (@dhclient_files) {
dhclient_show_lease($file);
}
exit 0;
#end of file
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