getcertnames.sh

function getcertnames() {
if [ -z "${1}" ]; then
    echo "ERROR: No domain specified."
    return 1
fi

local domain="${1}"
echo "Testing ${domain}…"
echo # newline

tmp=$(echo -e "GET / HTTP/1.0\nEOT" \
    | openssl s_client -connect "${domain}:443" 2>&1);

if [[ "${tmp}" = *"-----BEGIN CERTIFICATE-----"* ]]; then
    certText=$(echo "${tmp}" \
        | openssl x509 -text -certopt "no_header, no_serial, no_version, \
        no_signame, no_validity, no_issuer, no_pubkey, no_sigdump, no_aux");
    echo "Common Name:"
    echo # newline
    echo "${certText}" | grep "Subject:" | sed -e "s/^.*CN=//";
    echo # newline
    echo "Subject Alternative Name(s):"
    echo # newline
    echo "${certText}" | grep -A 1 "Subject Alternative Name:" \
        | sed -e "2s/DNS://g" -e "s/ //g" | tr "," "\n" | tail -n +2
    return 0
else
    echo "ERROR: Certificate not found.";
    return 1
fi
}