#!/bin/bash

if [ $# -ne 2 ]; then
        echo "usage: $0  "
        exit 1
fi

domain=$1
expiration_days=$2
msg=

expiration_string=`whois "$domain" |  egrep -i 'Expiration|Expires on' | head -1  | awk '{print $NF}'`
if [ $? -ne 0 ]; then
        echo "ERROR executing whois for the $domain domain - $expiration_string"
        exit 1
fi

expiration_epoch=`date --date="$expiration_string" '+%s'`
rightnow_epoch=`date '+%s'`

seconds_left=`expr $expiration_epoch - $rightnow_epoch`
days_left=`expr $seconds_left / 86400`

if [ $days_left -le $expiration_days ]; then
        rc=1
        msg="WARNING"
else
        rc=0
        msg="OK"
fi
echo "$msg - $domain expires in $days_left days"

exit $rc