#!/bin/sh
# version 2.1.1 
# see , route, flush
# Source function library.
echo 1 > /proc/sys/net/ipv4/ip_forward

. /etc/rc.d/init.d/functions


CLIC_INTERFACE="eth0"
EXTERNAL_INTERFACE="eth1"		
IPTABLES="/sbin/iptables"

IPCLIC=`/sbin/ifconfig ${CLIC_INTERFACE} | grep "inet ad" | sed -e "s/\\ Bcast.*$//; s/.*://" | sed -e "s/ //"`
IPEXTERNAL=`/sbin/ifconfig ${EXTERNAL_INTERFACE} | grep "inet ad" | sed -e "s/\\ Bcast.*$//; s/.*://" | sed -e "s/ //"`
IPBASE_CLIC="`echo ${IPINTERNAL} | awk -F. '{print $1"."$2"."$3}'`"
IPBASE_EXTERNAL="`echo ${IPEXTERNAL} | awk -F. '{print $1"."$2"."$3}'`"


case $1 in
	see)
	gprintf " - Filter rules" 
	${IPTABLES} -L -t filter -v -n
	echo
	gprintf " - NAT rules" 
	${IPTABLES} -L -t nat -v -n
	#gprintf "Mangle regles"
	#iptables -L -t mangle -v -n
	# echo
	gprintf " -end-"
	;;
	
	share)
	$0 flush
action "Postrouting ${IPBASE_CLIC} " ${IPTABLES} -t nat -A POSTROUTING -o ${CLIC_INTERFACE} -j MASQUERADE
action "Postrouting ${IPBASE_EXTERNAL}" ${IPTABLES} -t nat -A POSTROUTING -o ${EXTERNAL_INTERFACE} -j MASQUERADE

	;;
	
	flush)
	action "flushing Rules INPUT" ${IPTABLES} -F INPUT
	action "flushing Rules OUTPUT" ${IPTABLES} -F OUTPUT
	action "flushing Rules FORWARD" ${IPTABLES} -F FORWARD
	action "flushing Rules POSTROUTING" ${IPTABLES} -t nat --flush POSTROUTING
	action "flushing Rules PREROUTING" ${IPTABLES} -t nat --flush PREROUTING
	;;
	
	*)
	gprintf "usage $0 : {see|share|flush}\n"
	;;
esac