#!/bin/sh

echo=/bin/echo
openssl=/usr/bin/openssl
sed=/usr/bin/sed
date=/bin/date
bc=/usr/bin/bc

host=$1
port=$2
end_date=`$echo "GET / HTTP/1.1" | $openssl s_client -host $host -port $port \
  -starttls imap 2>/dev/null | $openssl x509 -dates -noout 2>/dev/null | $sed \
  -n 's/notAfter=//p'`
if [ -n "$end_date" ]
    then
        end_date_seconds=`$date -j -f "%b %d %T %Y %Z" "$end_date" "+%s"`
        now_seconds=`$date '+%s'`
        $echo "($end_date_seconds-$now_seconds)/24/3600" | $bc
fi
exit 0