#! /bin/bash

SERVER=$1
TIMEOUT=25
RETVAL=0
#TIMESTAMP=`echo | date`

if [ -z "$2" ]; then
	PORT=443;
else
	PORT=$2;
fi

if [ -z "$3" ]; then
  SNI=$1
else
  SNI=$3
fi

EXPIRE_DATE=`echo "" | openssl s_client -connect ${SERVER}:${PORT} -servername ${SNI} 2>/dev/null | openssl x509 -noout -dates 2>/dev/null | grep notAfter | cut -d'=' -f2`
EXPIRE_SECS=`date -d "${EXPIRE_DATE}" +%s`
EXPIRE_TIME=$(( ${EXPIRE_SECS} - `date +%s` ))

if [ ${EXPIRE_TIME} -lt 0 ]; then
   RETVAL=0
else
   RETVAL=$(( ${EXPIRE_TIME} / 24 / 3600 ))
fi

echo ${RETVAL}