#!/bin/sh
###############################################################################
#                                                                             #
# IPFire.org - An Open Source Firewall                                        #
# Copyright (C) 2026  IPFire Team  <info@ipfire.org>                          #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU 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 General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

main() {
	local args=(
		# Wait for one second only
		"+timeout=1"

		# Don't retry
		"+retry=0"

		# Query the local DNS service
		"@127.0.0.1"

		# Query for localhost
		"A" "localhost."
	)

	local timeout=120
	local i=0

	while [ "${i}" -lt "${timeout}" ]; do
		if kdig "${args[@]}" >/dev/null 2>&1; then
			return 0
		fi

		# Increment i
		(( i++ ))
	done

	# Fail
	return 1
}

main "$@" || exit $?