#!/bin/bash

# transparent_proxying  This shell script takes care of starting and stopping

#               transparent proxying

#

# chkconfig: - 91 24

# description: transparent proxying: this will force all web traffic to be \

#	redirected to the squid proxy server. It will only work if squid \

#	is running

# pidfile: /var/run/squid.pid

# Source function library.

. /etc/init.d/functions

start() {

	echo -n "Starting transparent proxying: "

	if [ -f /var/run/squid.pid ]

	then

		# Turn on IP forwarding

		echo 1 > /proc/sys/net/ipv4/ip_forward

		# Turn on transparent proxy redirect

		/sbin/iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128

       		echo_success

	else

		echo -n "Squid is not running! "

       		echo_failure

	fi

	echo

	return 0

}	

stop() {

	echo -n "Stopping transparent proxying: "

	echo 0 > /proc/sys/net/ipv4/ip_forward

	# Turn off transparent proxy redirect

	/sbin/iptables -t nat -D PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128

  	echo_success

	echo

	return 0

}	

status() {

	if [ "`/sbin/iptables -L -n -t nat | grep '80 redir ports 3128'`" ]

	then

		echo "Transparent proxying is active"

		return 0

	else

		echo "Transparent proxying is inactive"

		return 0

	fi

}	

restart() {

	    stop

	    start

}

case "$1" in

  start)

  	start

	;;

  status)

  	status

	;;

  stop)

  	stop

	;;

  restart|reload)

  	restart

	;;

  *)

	echo "*** Usage: {start|stop|restart}"

	exit 1

esac

exit $?