#!/bin/bash

dyndns_name="da-checka.ddnss.de"

myip="$(curl -s http://whatismyip.akamai.com/)"
dnsip="$(dig $dyndns_name +short)"

#debug
#echo -e "My IP:\t$myip\nDNS IP:\t$dnsip"

if [ "$myip" = "$dnsip" ]
then
	echo "OK - My IP = \"$myip\"; DNS IP = \"$dnsip\""
	exit 0
elif [ "$myip" != "$dnsip" ]
then
	echo "CRITICAL - My IP = \"$myip\"; DNS IP = \"$dnsip\""
	exit 2
else
	echo "UNKNOWN - Unbekannter Status"
	exit 3	
fi