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#!/bin/sh
# Copyright (c) 2007-2009 Roy Marples
# All rights reserved

# named 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 "@SYSCONFDIR@"/resolvconf.conf ] || exit 0
. "@SYSCONFDIR@/resolvconf.conf" || exit 1
[ -z "$named_zones" -a -z "$named_options" ] && exit 0
[ -z "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)"

# Platform specific kludges
if [ -z "$named_service" -a -z "$named_restart" -a \
	-d "@RCDIR@" -a ! -x "@RCDIR@"/named ]
then
	if [ -x "@RCDIR@"/bind9 ]; then
		# Debian and derivatives
		named_service=bind9
	fi
fi
: ${named_service:=named}
: ${named_restart:=@RESTARTCMD ${named_service}@}
newoptions="# Generated by resolvconf\n"
newzones="$newoptions"

forward=
for n in $NAMESERVERS; do
	case "$forward" in
	*"\n\t$n;"*);;
	*) forward="$forward\n\t$n;";;
	esac
done
if [ -n "$forward" ]; then
	newoptions="${newoptions}forward first;\nforwarders {$forward\n};\n"
fi

for d in $DOMAINS; do
	newzones="${newzones}zone \"${d%%:*}\" {\n"
	newzones="$newzones\ttype forward;\n"
	newzones="$newzones\tforward first;\n\tforwarders {\n"
	ns="${d#*:}"
	while [ -n "$ns" ]; do
		newzones="$newzones\t\t${ns%%,*};\n"
		[ "$ns" = "${ns#*,}" ] && break
		ns="${ns#*,}"
	done
	newzones="$newzones\t};\n};\n"
done

# No point in changing files or reloading bind if the end result has not
# changed
changed=false
if [ -n "$named_options" ]; then
	if [ ! -f "$named_options" ] || \
		[ "$(cat "$named_options")" != "$(printf "$newoptions")" ]
	then
		printf "$newoptions" >"$named_options"
		changed=true
	fi
fi
if [ -n "$named_zones" ]; then
	if [ ! -f "$named_zones" ] || \
		[ "$(cat "$named_zones")" != "$(printf "$newzones")" ]
	then
		printf "$newzones" >"$named_zones"
		changed=true
	fi
fi

if $changed; then
	eval $named_restart
fi