#! /bin/sh
#
#

port=443
file=""
verb=0
quiet=0
starttls=""

while :; do
  case "$1" in
  -p ) port="$2" ; shift 2 ;;
  -v ) verb=1 ; shift ;;
  -q | -s ) quiet=1 ; shift ;;
  -TLS ) starttls=" -starttls $2" ; shift  2 ;;
  -* ) echo "Unknown option $1" >&2 ; exit 1 ;;
  * ) break;
  esac
done

case "$#" in
1 ) host="$1" ;;
* ) echo "Usage: $0 [-p port] hostname-or-filename" >&2 ; exit 1 ;;
esac

if [ -f "$host" ]; then
  # we are apparently a file, not a host
  echo "File: $host"
  if [ `grep -c 'PRIVATE KEY' "$host"` -ne 0 ]; then
    # we are a private key, print the modulus
    echo -ne "Private key "
    openssl rsa -modulus -noout -in "$host" | perl -pe 's/^Modulus=(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2}).*$/Modulus: $1:$2:$3:$4:$5:$6:$7:$8:$9 .../'
    exit 0
  elif [ `grep -c 'CERTIFICATE REQUEST' "$host"` -ne 0 ]; then
    osslcmd=req
  else osslcmd=x509
  fi
  openssl $osslcmd -text -modulus -noout -in "$host" | egrep '(Subject:|Issuer:|Not Before|Not After|DNS|Modulus=)' | sed -e 's/^ *//g' | perl -pe 's/^Modulus=(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2}).*$/Modulus: $1:$2:$3:$4:$5:$6:$7:$8:$9 .../' |perl -pe 's/,\sDNS:/\n  /g;s/^DNS:/SubjectAltNames:\n  /'
  if [ $osslcmd = "x509" ]; then
    openssl $osslcmd -serial -noout -in "$host" | sed -e 's/^serial=/Serial:  /'
  fi
else
  echo "Hostname: $host"
  if [ $quiet = 0 ]; then
    openssl s_client $starttls -connect "$host":$port -showcerts < /dev/null 2>/dev/null  | openssl x509 -serial -text -modulus -noout | egrep '(Subject:|Issuer:|Not After|DNS|Modulus=|serial=)' | sed -e 's/^ *//g' | perl -pe 's/^Modulus=(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2}).*$/Modulus: $1:$2:$3:$4:$5:$6:$7:$8:$9 .../'|perl -pe 's/,\sDNS:/\n  /g;s/^DNS:/SubjectAltNames:\n  /' | perl -pe 's/^serial=/Serial Number/ and $_ = (join ":",unpack "(A13)(A2)*", $_)."\n"'
  else
    openssl s_client $starttls -connect "$host":$port -showcerts < /dev/null 2>/dev/null  | openssl x509 -serial -text -modulus -noout | egrep '(Subject:|Issuer:|Not After|Modulus=|serial=)' | sed -e 's/^ *//g' | perl -pe 's/^Modulus=(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2}).*$/Modulus: $1:$2:$3:$4:$5:$6:$7:$8:$9 .../'|perl -pe 's/,\sDNS:/\n  /g;s/^DNS:/SubjectAltNames:\n  /' | perl -pe 's/^serial=/Serial number: / and $_ = (join ":",unpack "(A13)(A2)*", $_)."\n"'
  fi

  echo "Certificate chain supplied by host:"
  openssl s_client $starttls -connect "$host":$port 2>&1 < /dev/null | egrep '[si]:' 
fi