#!/bin/sh
# Copyright (c) 2009-2019 Roy Marples
# All rights reserved

# PowerDNS Recursor subscriber for resolvconf

# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

[ -f "/etc"/resolvconf.conf ] || exit 0
. "/etc/resolvconf.conf" || exit 1
[ -z "$pdns_zones" ] && exit 0
[ -z "$RESOLVCONF" ] && eval "$(/sbin/resolvconf -v)"
NL="
"

: ${pdns_service:=pdns-recursor}

newzones=

for n in $NAMESERVERS; do
	newzones="$newzones${newzones:+,}$n"
done
[ -n "$newzones" ] && newzones="+.=$newzones$NL"

for d in $DOMAINS; do
	newns=
	ns="${d#*:}"
	while [ -n "$ns" ]; do
		newns="$newns${newns:+,}${ns%%,*}"
		[ "$ns" = "${ns#*,}" ] && break
		ns="${ns#*,}"
	done
	[ -n "$newns" ] && newzones="$newzones${d%%:*}=$newns$NL"
done

# Try to ensure that config dirs exist
if type config_mkdirs >/dev/null 2>&1; then
	config_mkdirs "$pdnsd_zones"
else
	/sbin/resolvconf -D "$pdnsd_zones"
fi

if [ ! -f "$pdns_zones" ] || \
	[ "$(cat "$pdns_zones")" != "$(printf %s "$newzones")" ]
then
	printf %s "$newzones" >"$pdns_zones"
	if [ -n "$pdns_restart" ]; then
		eval $pdns_restart
	elif [ -n "$RESTARTCMD" ]; then
		set -- ${pdns_service}
		eval "$RESTARTCMD"
	else
		/sbin/resolvconf -r ${pdns_service}
	fi
fi