#!/bin/sh
#
# Copyright (c) 2006  Hajimu UMEMOTO
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Mahoroba$
#

usage() {
	echo "usage: ${progname} [-c count] [-i interval] [-p rpidfile]" 1>&2
	exit 2
}

interval='15'
count='1'
pidfile='/var/run/dtcpclient-pinger.pid'
mode='start'

progname=`basename $0`

set -- `getopt c:i:kp: $*`
if [ $? != 0 ]; then
	usage
fi

for c in $*; do
	case $c in
	-c)	count="$2";	shift 2;;
	-i)	interval="$2";	shift 2;;
	-k)	mode='stop';	shift;;
	-p)	pidfile="$2";	shift 2;;
	--)	shift; break;;
	-h)	usage;;
	esac
done

case ${mode} in
start)
	if [ $# -ne 1 ]; then
		usage
	fi
	host=$1
	trap "rm -f ${pidfile}; exit 0" 1 2 3 15
	echo $$ > ${pidfile}
	while true; do
		ping6 -c${count} -n ${host} > /dev/null 2>&1
		sleep ${interval}
	done
	;;
stop)
	if [ $# -ne 0 ]; then
		usage
	fi
	if [ -f ${pidfile} ]; then
		kill `cat ${pidfile}`
	fi
	;;
esac

exit 0