#!/usr/bin/env bash

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

device=${1:-"ppp0"}

provider=${2:-"dsl-provider"}

ptp_addr="$(ip addr show $device | grep peer | awk '{print$4}' | cut -d '/' -f1)"

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

reconnect() {
   ifdown $provider >/dev/null 2> /dev/null
   sleep 5
   killall -9 pppd
   sleep 2
   ifup $provider >/dev/null 2> /dev/null
   sleep 5
   ptp_addr="$(ip addr show $device | grep peer | awk '{print$4}' | cut -d '/' -f1)"
   if [[ -z "$ptp_addr" ]] ; then
      echo "[ Error ]: reconnection host `hostname --long` failed at `date +\"%d.%m.%Y %H:%M:%S\"`"
   else
      echo "[ `hostname --long`]:  reconnected at `date +\"%d.%m.%Y %H:%M:%S\"`"
   fi
   echo ""
   echo "`df`"
}

if [[ -z "$ptp_addr" ]] ; then
   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;
      reconnect
   fi
fi
   
exit 0;