#!/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 $?