IPUPDATE

#!/bin/sh
if [[ ! -d /root/scripts/IPINFO ]]; then
        mkdir -p /root/scripts/IPINFO
fi
if [ -e /root/scripts/IPINFO/ipaddr ]; then
        OLDIP=$(cat /root/scripts/IPINFO/ipaddr)
else
        OLDIP=""
fi
if [ -e /root/scripts/IPINFO/bcast ]; then
        OLDBC=$(cat /root/scripts/IPINFO/bcast)
else
        OLDBC=""
fi
if [ -e /root/scripts/IPINFO/gw ]; then
        OLDGW=$(cat /root/scripts/IPINFO/gateway)
else
        OLDGW=""
fi

while [[ ! -n $CURIP || ! -n $CURBC || ! -n $CURGW ]]; do 
	CURIP=$(ip addr show dev eth0 | grep inet | head -1 | cut -f 6 -d " " | cut -f 1 -d \/)
	CURBC=$(ip addr show dev eth0 | grep inet | head -1 | cut -f 8 -d " " | cut -f 1 -d \/)
	CURGW=$(ip route | grep default | cut -f 3 -d " ")
	sleep 3
done

if [[ $CURIP != $OLDIP ]]; then
        for i in /root/scripts/iptables-restore /etc/ipsec.conf /etc/ipsec.secrets /etc/xl2tpd/xl2tpd.conf; do
                sed -i s/$OLDIP/$CURIP/g $i;
        done
fi

if [[ $CURBC != $OLDBC ]]; then
        for i in /root/scripts/iptables-restore /etc/ipsec.conf /etc/xl2tpd/xl2tpd.conf; do
                sed -i s/$OLDBC/$CURBC/g $i;
        done
fi

if [[ $CURGW != $OLDGW ]]; then
        for i in /root/scripts/iptables-restore /etc/ipsec.conf /etc/xl2tpd/xl2tpd.conf; do
                sed -i s/$OLDGW/$CURGW/g $i;
        done
fi

echo -n "$CURIP" > /root/scripts/IPINFO/ipaddr
echo -n "$CURBC" > /root/scripts/IPINFO/bcast
echo -n "$CURGW" > /root/scripts/IPINFO/gateway