#!/usr/bin/perl
#
# Module: dhclient
#
# **** 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.
#
# A copy of the GNU General Public License is available as
# `/usr/share/common-licenses/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at `http://www.gnu.org/copyleft/gpl.html'.
# You can also obtain it by writing to the Free Software Foundation,
# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# 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: November 2008
# Description: Script to release lease on link down
#
# **** End License ****
#

use lib "/opt/vyatta/share/perl5/";
use VyattaConfig;
use VyattaMisc;

use strict;
use warnings;

sub stop_dhclient {
    my $intf = shift;
    my $dhcp_daemon = '/sbin/dhclient';
    my ($intf_config_file, $intf_process_id_file, $intf_leases_file) = VyattaMisc::generate_dhclient_intf_files($intf);
    my $release_cmd = "$dhcp_daemon -q -cf $intf_config_file -pf $intf_process_id_file -lf $intf_leases_file -r $intf 2> /dev/null";
    system ($release_cmd);
}


#
# main
#

my $dev=shift;

# only do this if interface is configured to use dhcp for getting IP address
if (VyattaMisc::is_dhcp_enabled($dev, "outside_cli")) {
   # do a dhcp lease release for interface
   stop_dhclient($dev);
}

exit 0;

# end of file