#!/bin/sh

#this is your dyn host
export DYNURL="dyn.url.com"
#here comes your url to dynamic-powerdns with your password
export UPDATESTRING="https://url.zum.dynamic-powerdns/?KEY"

export PIP="$(wget -qO- ipv4.icanhazip.com)"
export DIP="$(nslookup "$DYNURL" | awk '/^Address: / { print $2 }')"

if [ "$PIP" = "$DIP" ]
  then
    echo "same IP - nothing to do"
  elif [ "$PIP" = "" ]
    then
      echo "Can't obtain IP Adress - check Network connection!"
  elif [ "$DIP" = "" ]
    then
      echo "Call Dynhost Admin his Server is down!!!"
      logger warning Call dynhost Admin his Server is Down #can be deleted if you have systemd
  else
    wget -qO- $UPDATESTRING
fi