swping.init

sharewall is very good

#!/bin/sh
#     Shorewall WAN Interface monitor - V4.2
#
#     This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
#
#     (c) 1999,2000,2001,2002,2003,2004,2005 - Tom Eastep ([e-mail])
#
#	On most distributions, this file should be called /etc/init.d/shorewall.
#
#	Complete documentation is available at http://shorewall.net
#
#	This program is free software; you can redistribute it and/or modify
#	it under the terms of Version 2 of the GNU General Public License
#	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.
#
#	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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#	Commands are:
#
#	   swping start			  Starts the monitor
#	   swping restart		  Restarts the monitor
#	   swping stop			  Stops the monitor
#	   swping status		  Displays monitor status
#
### BEGIN INIT INFO
# Provides:	  swping
# Required-Start: shorewall
# Should-Start: 
# Required-Stop:
# Default-Start:  2 3 5
# Default-Stop:	  0 1 6
# Description: Monitor External links and restart Shorewall when a link goes up or down.
### END INIT INFO

PROG=/usr/local/sbin/swping    # The 'swping' script.
STATEDIR=/var/lib/shorewall/   # Where to maintain the '.pid' file.

start() {
    echo "Starting swping."

    if [ -f $STATEDIR/swping.pid ] && ps -p $(cat $STATEDIR/swping.pid) > /dev/null 2>&1; then
	echo "swping is already running" >&2
	exit 0
    fi

    /usr/local/sbin/swping >> /var/log/swping &
    if [ $? -eq 0 ]; then
	echo $! > $STATEDIR/swping.pid
	echo "Done."
    else
	rm -f $STATEDIR/swping.pid
    fi
}

stop() {
    echo "Stoping swping."
    if [ -f $STATEDIR/swping.pid ]; then
	kill -9 $(cat $STATEDIR/swping.pid)
	rm -f $STATEDIR/swping.pid
    fi

    echo "Done."
}

command="$1"

case "$command" in
    start)
	start
	;;
    stop)
	stop
	;;
    restart)
	stop
	start
	;;
    status)
	if [ -f $STATEDIR/swping.pid ]; then
	    echo "swping is running"
	    exit 0
	else
	    echo "swping is stopped" 
	    exit 3
	fi
	;;
    *)
	echo "Usage /etc/init.d/swping start|stop|restart|status"
	;;
esac