tlsversion.sh

#!/bin/bash
# -*- coding: utf-8 -*-
OPENSSL_CMD=$(which openssl)
if [[ $OSTYPE =~ ^darwin ]]; then
   OPENSSL_CMD=$(ls -1 /usr/local/Cellar/openssl*/*/bin/openssl | tail -1)
   if [ "x${OPENSSL_CMD}" = "x" ]; then
       echo "need to: brew install openssl"
       exit 1
   fi
fi

domain=$1
if [ -z "$domain" ]; then
   echo "usage: $(basename $0) <domain>" 1>&2
   exit 2
fi

for op in tls1 tls1_1 tls1_2 tls1_3; do
    _OP=${op/tls/TLSv}
    if [[ $_OP =~ _ ]]; then
        :
    else
        _OP=${_OP}_0
    fi
    _OP=${_OP/_/.}
    ${OPENSSL_CMD} s_client -connect $domain:443 -servername $domain -$op < /dev/null > /dev/null 2>&1 && echo $domain OK $_OP || echo $domain NG $_OP
done