#!/bin/sh
#
# this is the qemu-ifup script that should be run at qemu's boot
#

# determine the interface to the outside
IF_WORLD=`/sbin/route -n | grep " UG " | sed "s/  */ /g" | cut -d " " -f 8 | head -1`
# nothing found? - sorry!
[ -z "$IF_WORLD" ] && IF_WORLD=eth0


if [ "$UID" -ne 0 ] 
	then	sudo $0 $*
		exit 0
  fi

echo "Laufe als root ..."

IPT=/sbin/iptables
[ ! -x $IPT ] && IPT=/usr/sbin/iptables

IPT_RULES="	FORWARD -i tun0 -o $IF_WORLD -j ACCEPT
		FORWARD -i $IF_WORLD -o tun0 -m state --state ESTABLISHED,RELATED -j ACCEPT
		POSTROUTING -t nat -o $IF_WORLD -j MASQUERADE
		INPUT -i tun0 -j ACCEPT
		OUTPUT -o tun0 -j ACCEPT"

aktiviere_forward()
{
	echo "$IPT_RULES" | while read a
		do	$IPT -A $a
	  done
	echo 1 >/proc/sys/net/ipv4/ip_forward
}

deaktiviere_forward()
{
	echo "$IPT_RULES" | while read a
		do	$IPT -D $a
	  done
	echo 0 >/proc/sys/net/ipv4/ip_forward
}

case "$1" in
	stop )
		deaktiviere_forward
		#/etc/init.d/dhcp stop
		;;
	* )
		/sbin/ifconfig $1 192.168.0.1
		#/etc/init.d/dhcp start
		aktiviere_forward
		;;
  esac