#!/bin/sh

ECHO=/usr/ucb/echo
LOGGER='/usr/bin/logger -i -p local4.info -t adsl-update'
PID_FILE=/var/run/adsl-update.pid
period=60

if [ -f $PID_FILE ] ; then
	kill `cat $PID_FILE`
fi

$ECHO $$ > $PID_FILE
$LOGGER "Started."

while [ -z "$orig" ] ; do
	sleep $period
	orig=`ifconfig sppp0 | grep inet | sed -e 's/^.*inet //' -e 's/ .*$//'`
done
$LOGGER "IP is $orig."
/usr/sbin/setipnat
/usr/sbin/sethome

while [ true ] ; do
	sleep $period
	addr=`ifconfig sppp0 | grep inet | sed -e 's/^.*inet //' -e 's/ .*$//'`
	if [ -n "$addr" ] ; then
		if [ "$addr" != "$orig" ] ; then
			/usr/sbin/setipnat
			/usr/sbin/sethome
			orig=$addr
			$LOGGER "IP was changed to $addr."
		fi
	fi
done