#!/bin/sh

usage ()
{
	echo >&2 "$(basename $0) v$VERSION Halt-On-Lan script" 	
	echo >&2 "Author hermann72pb <http://www.ip-phone-forum.de/member.php?u=80424>"
	echo >&2 ""
	echo >&2 "Usage: $(basename $0) HOST [ACTION TIME MESSAGE]"
	echo >&2 "HOST      Hostname or ip address: e.g. my.computer or 192.168.178.20"
	echo >&2 "ACTION    Actions for poweroff: e.g. shutdown, reboot, logoff, lock, etc."
	echo >&2 "TIME      time in seconds for warning before the action:"
	echo >&2 "          e.g. 10 or 0 for no warning"
	echo >&2 "MESSAGE   Warning message: e.g. Please close all your files"
	exit 255
}

CONFFILE="hol.cfg"
CONFPATH="/mod/etc/conf/"
if [ ! -r "$CONFPATH$CONFFILE" ]; then
	echo >&2 "Error [$(basename $0)]: not configured"
	exit 100
fi
. $CONFPATH$CONFFILE

VERSION="1.0"
HOL_TMP="/tmp/hol"

[ $# -ge 1 -a -n "$1" ] && HOL_HOST="$1" || usage
[ $# -ge 2 -a -n "$2" ] && HOL_ACTION="$2"
[ $# -ge 3 -a -n "$3" ] && HOL_TIME=$3
[ $# -ge 4 -a -n "$4" ] && HOL_MESSAGE="$4"

{
[ -n "$HOL_PASS" ] && echo "password $HOL_PASS"
echo "action $HOL_ACTION"
if [ -n "$HOL_TIME" -a -n "$HOL_MESSAGE" ]; then
{
	if [ $HOL_TIME -gt 0 ]; then
	{
		echo "warning on"
		echo "warntime $HOL_TIME"
		echo "message $(echo "$HOL_MESSAGE" | sed -ne '$!N;${s/\r\|\n/\\n/g;p}')"
	}
	else
	{
		echo "warning off"
		echo "warntime 0"
	}
	fi
}
else
{
	echo "warning off"
	echo "warntime 0"
}
fi
echo "who local"
echo "when immediate"
echo "cancel on"
echo "doit"
sleep 1
} | telnet $HOL_HOST $HOL_PORT > ${HOL_TMP}
hol_errors="$(cat ${HOL_TMP} | grep 501)"
rm -f ${HOL_TMP}
if [ -z "$hol_errors" ]; then
{
	exit 0
}
else
{
	errcode=1
	echo >&2 "$hol_errors"
	[ -n "$(echo "$hol_errors" | grep "Invalid value specified")" ] && errcode=3
	[ -n "$(echo "$hol_errors" | grep "Access is denied")" ] && errcode=2
	exit $errcode
}
fi