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

# dnsmasq 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 "$dnsmasq_conf" -a -z "$dnsmasq_resolv" ] && exit 0
[ -z "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)"

: ${dnsmasq_pid:=/var/run/dnsmasq.pid}
[ -s "$dnsmasq_pid" ] || dnsmasq_pid=/var/run/dnsmasq/dnsmasq.pid
: ${dnsmasq_service:=dnsmasq}
: ${dnsmasq_restart:=@RESTARTCMD ${dnsmasq_service}@}
newconf="# Generated by resolvconf\n"
newresolv="$newconf"

# Using dbus means that we never have to restart the daemon
# This is important as it means we should not drop DNS queries
# whilst changing DNS options around. However, dbus support is optional
# so we need to validate a few things first.
# Check for DBus support in the binary
dbus=false
: ${dbus_pid:=/var/run/dbus/dbus.pid}
[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid
[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid
if [ -s "$dbus_pid" -a -s "$dnsmasq_pid" ]; then
	if dnsmasq --version 2>/dev/null | \
		grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]"
	then
		# Sanity - check that dnsmasq and dbus are running
		if kill -0 $(cat "$dbus_pid") 2>/dev/null && \
			kill -0 $(cat "$dnsmasq_pid") 2>/dev/null
		then
			dbus=true
			newconf="$newconf\n# Domain specific servers will"
			newconf="$newconf be sent over dbus\nenable-dbus\n"
		fi
	fi
fi

for n in $NAMESERVERS; do
	newresolv="${newresolv}nameserver $n\n"
done

dbusdest=
for d in $DOMAINS; do
	dn="${d%%:*}"
	ns="${d#*:}"
	while [ -n "$ns" ]; do
		if $dbus; then
			SIFS=${IFS-y} OIFS=$IFS
			IFS=.
			set -- ${ns%%,*}
			num="0x$(printf "%02x" $1 $2 $3 $4)"
			if [ "$SIFS" = yi ]; then
				unset IFS
			else
				IFS=$OIFS
			fi
			dbusdest="$dbusdest uint32:$(printf "%u" $num)"
			dbusdest="$dbusdest string:$dn"
		else
			newconf="${newconf}server=/$dn/${ns%%,*}\n"
		fi
		[ "$ns" = "${ns#*,}" ] && break
		ns="${ns#*,}"
	done
done

changed=false
if [ -n "$dnsmasq_conf" ]; then
	if [ ! -f "$dnsmasq_conf" ] || \
		[ "$(cat "$dnsmasq_conf")" != "$(printf "$newconf")" ]
	then
		changed=true
		printf "$newconf" >"$dnsmasq_conf"
	fi
fi
if [ -n "$dnsmasq_resolv" ]; then
	if [ -f "$dnsmasq_resolv" ]; then
		if [ "$(cat "$dnsmasq_resolv")" != "$(printf "$newresolv")" ]
		then
			changed=true
			printf "$newresolv" >"$dnsmasq_resolv"
		fi
	else
		# dnsmasq polls this file so no need to set changed=true
		printf "$newresolv" >"$dnsmasq_resolv"
	fi
fi

if $changed; then
	eval $dnsmasq_restart
fi
if $dbus; then
	$changed || kill -HUP $(cat "$dnsmasq_pid")
	# Send even if empty so old servers are cleared
	dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
 		/uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \
  		$dbusdest
fi