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#!/bin/sh
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
main()
{
# Handle opts
while getopts ":h" opt
do
case "$opt" in
h) usage && exit 0 ;;
*)
printf "Invalid option passed: %s\n" "$OPTARG" >&2
;;
esac
done
shift $(( OPTIND - 1 ))
# Show help
[ -z "$1" ] && usage && exit 1
# Perform the request to fetch the certificate, and print it on STDOUT
printf "%s" "" \
| openssl s_client -connect "$1:${2:-443}" 2> /dev/null \
| sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p'
}
usage()
{
cat <<EOF
Usage:
${0##*/} -h
Nondescript
Options:
-h Show this help text and exit.
EOF
}
main "$@"
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