#!/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 "$@"