#!/bin/bash
#
# Copyright (c) 2002-2003 SuSE Linux AG Nuernberg, Germany.
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# 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.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA
#
# Author: Peter Poeml <poeml@suse.de>
#
# $Id: dhcpcd-hook 1192 2005-04-22 12:53:31Z zoz $


#
# Hook script for dhcpcd (the DHCP client)
# =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
#
# It is called when an interface is brought "up", "down", or the IP address has
# changed ("new").
#
# It calls "ifup <interface> -o dhcp", which does the following:
#
#  - set up routing according to /etc/sysconfig/network/ifroute-* 
#    (where you can configure routes per interface)
#
#  - execute /etc/sysconfig/network/if-{up,down}.d/*
#    (where you can place your own scripts)
#
#  - execute POST_UP scripts defined in /etc/sysconfig/network/ifcfg-* 
#    (see "man 8 ifup")
#
# Thus, those are the hooks where you can add stuff.


#  The following parameters are passed to this script by dhcpcd:
#  $1 = HostInfoFilePath, e.g  "/var/lib/dhcpcd/dhcpcd-eth0.info"
#  $2 = "up" if interface has been configured with the same
#       IP address as before reboot;
#  $2 = "down" if interface has been shut down;
#  $2 = "new" if interface has been configured with new IP address;
#  $3 (optional) = "-d" debug flag passed if dhcpcd daemon has been
#       invoked with "-d" flag



my_name=${0##*/}

# log_err="logger -s -t $my_name -p daemon.err"
# log_dbg="logger -s -t $my_name -p daemon.debug"
log_err="logger -t $my_name -p daemon.err"
log_dbg="logger -t $my_name -p daemon.debug"

if [ $# -lt 2 ]; then
	$log_err "wrong usage"
	exit 1
fi

leaseinfo="$1"
state="$2"
debug="$3"

if [ -n "$debug" ]; then
	$log_dbg "State: $state. Leaseinfo: ${leaseinfo:-<none given>}"
	debug=true
else
	debug=false
fi

# it is possible that the leaseinfo file does not exist:
#  - when it has never been written (since a lease was never acquired)
#  - when deleted manually
# in this case, we don't even know which interface is concerned, and
# there's nothing to do about it.
# (in the 'leaseinfo does not exist case' the interface can still be 
# guessed from the name, but I doubt it's useful to run ifdown then)
if test -z $leaseinfo; then
        $log_dbg "Skipping 'ifdown \$INTERFACE -o dhcp' call"
        exit 0
fi
if ! test -e $leaseinfo; then
        $log_dbg "$leaseinfo does not exist. Skipping 'ifdown \$INTERFACE -o dhcp' call"
        exit 0
fi



while read line; do
	case "$line" in
		INTERFACE*|IPADDR*) eval $line;;
	esac
done < $leaseinfo


case $state in
up)
	$debug && $log_dbg "Running ifup $INTERFACE -o dhcp"
	ifup $INTERFACE -o dhcp
	;;
down)
	# We now call PRE_DOWN_SCRIPT directly from ifdown, because it was called
	# POST from here (after IP address was removed). Thus we don't need this
	# $debug && $log_dbg "Running ifdown $INTERFACE -o dhcp"
	# ifdown $INTERFACE -o dhcp
	;;
new)
	$debug && $log_dbg "new IP address: $IPADDR"
	$debug && $log_dbg "Running ifdown $INTERFACE -o dhcp"
	ifdown $INTERFACE -o dhcp
	$debug && $log_dbg "Running ifup $INTERFACE -o dhcp"
	ifup $INTERFACE -o dhcp
	;;
esac


exit 0
