#!/bin/sh
#
# Univention Bind
#
# Copyright 2011-2014 Univention GmbH
#
# http://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided 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.
#
# You should have received a copy of the GNU Affero General Public
# License with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <http://www.gnu.org/licenses/>.

eval "$(univention-config-registry shell)"

if [ -n "$bind_bindpw" -a "$bind_bindpw" != "/etc/machine.secret" ]; then
	# Skip the passwdord change
	exit 0
fi

bind_service(){
	local action=$1

	# start / stop bind9 only if the ldap backend is configured
	if [ "$dns_backend" = "ldap" ]; then
		if [ "$action" = "start" ]; then
			# start bind9 only if it has been stopped by this script
			if [ "$dns_bind9_stoppedbyserverpasswordchange" = "yes" ] ; then
				echo "starting bind9 after server password change" | logger -t "server-password-change"
				invoke-rc.d bind9 start >/dev/null
				univention-config-registry unset dns/bind9/stoppedbyserverpasswordchange >/dev/null
			fi
		fi
		if [ "$action" = "stop" ]; then
			if invoke-rc.d bind9 status | grep -q "is running" ; then
				univention-config-registry set dns/bind9/stoppedbyserverpasswordchange=yes >/dev/null
				echo "stopping bind9 due to upcoming server password change" | logger -t "server-password-change"
				invoke-rc.d bind9 stop >/dev/null
			fi
		fi
	fi
}

if [ "$1" = "prechange" ] ; then
	bind_service stop
fi

if [ "$1" = "nochange" ] ; then
	bind_service start
fi

if [ "$1" = "postchange" ] ; then
	# update zone files
	sed -i "s|\!x-bindpw=\(.*\),x-tls|\!x-bindpw=$(cat /etc/machine.secret),x-tls|" /etc/bind/univention.conf.d/*
	bind_service start
fi
