#!/bin/bash

statusfile="/var/tmp/dyndns.monitoring"
if ! [[ -f "$statusfile" ]]
then
    echo "Status file not found"
    exit 3
fi

mtime=$(stat -c %Y $statusfile)
now=$(date +%s)
if (( $now - $mtime > 60*60*24*8 ))
then
    echo "Status file is older than 8 days!"
    exit 3
fi

statuscode=$(cat $statusfile)
case "$statuscode" in
    200)
        echo "OK"
        exit 0
        ;;
    *)
        echo "Last statuscode was $statuscode"
        exit 2
        ;;
esac