#!/usr/bin/env bash

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

ptp_addr=`ifconfig  ppp0 2>/dev/null | grep -e "P-[tz]-P" | cut -d":" -f3 | cut -d " " -f1`

alternate_addr="google.com heise.de debian.org ubuntu.com"

reconnect() {
   ifdown dsl-provider >/dev/null 2> /dev/null
   sleep 5
   killall -9 pppd > /dev/null 2> /dev/null
   sleep 5
   ifup dsl-provider >/dev/null 2> /dev/null
   sleep 5
   ptp_addr=`ifconfig  ppp0 2>/dev/null | grep -e "P-[tz]-P" | cut -d":" -f3 | cut -d " " -f1`
   if [ "X$ptp_addr" == "X" ] ; then
      echo "[ Error ]: reconnection host `hostname --long` failed at `date +\"%d.%m.%Y %H:%M:%S\"`"
   else
      echo "[  OK   ]: `hostname --long` reconnected at `date +\"%d.%m.%Y %H:%M:%S\"`"
   fi
   echo ""
   echo "`df`"
}

if [ "X$ptp_addr" == "X" ] ; then
   echo "[ Error ]: Internetconnection seems to be down!"
   echo "           Trying to reconnect.."
   echo ""
   reconnect
else
   ping -c3 $ptp_addr >/dev/null 2> /dev/null
   rval=$?
   if [ $rval -ne  0 ]; then
      for ip_addr in $alternate_addr  ; do
         ping -c3 $ip_addr >/dev/null 2> /dev/null
         if [ $? -eq 0 ]; then
            exit 0
         fi
      done;
      echo "[ Error ]: Internetconnection seems to be down!"
      echo "           Trying to reconnect.."
      echo ""
      reconnect
   fi
fi
   
exit 0;