dnsmasq.in revision 225524 
1#!/bin/sh
2# Copyright (c) 2007-2009 Roy Marples
3# All rights reserved
4
5# dnsmasq subscriber for resolvconf
6
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted provided that the following conditions
9# are met:
10#     * Redistributions of source code must retain the above copyright
11#       notice, this list of conditions and the following disclaimer.
12#     * Redistributions in binary form must reproduce the above
13#       copyright notice, this list of conditions and the following
14#       disclaimer in the documentation and/or other materials provided
15#       with the distribution.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29[ -f "@SYSCONFDIR@"/resolvconf.conf ] || exit 0
30. "@SYSCONFDIR@/resolvconf.conf" || exit 1
31[ -z "$dnsmasq_conf" -a -z "$dnsmasq_resolv" ] && exit 0
32[ -z "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)"
33NL="
34"
35
36: ${dnsmasq_pid:=/var/run/dnsmasq.pid}
37[ -s "$dnsmasq_pid" ] || dnsmasq_pid=/var/run/dnsmasq/dnsmasq.pid
38: ${dnsmasq_service:=dnsmasq}
39: ${dnsmasq_restart:=@RESTARTCMD ${dnsmasq_service}@}
40newconf="# Generated by resolvconf$NL"
41newresolv="$newconf"
42
43# Using dbus means that we never have to restart the daemon
44# This is important as it means we should not drop DNS queries
45# whilst changing DNS options around. However, dbus support is optional
46# so we need to validate a few things first.
47# Check for DBus support in the binary
48dbus=false
49: ${dbus_pid:=/var/run/dbus/dbus.pid}
50[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid
51[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid
52if [ -s "$dbus_pid" -a -s "$dnsmasq_pid" ]; then
53	if dnsmasq --version 2>/dev/null | \
54		grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]"
55	then
56		# Sanity - check that dnsmasq and dbus are running
57		if kill -0 $(cat "$dbus_pid") 2>/dev/null && \
58			kill -0 $(cat "$dnsmasq_pid") 2>/dev/null
59		then
60			dbus=true
61			newconf="$newconf$NL# Domain specific servers will"
62			newconf="$newconf be sent over dbus${NL}enable-dbus$NL"
63		fi
64	fi
65fi
66
67for n in $NAMESERVERS; do
68	newresolv="${newresolv}nameserver $n$NL"
69done
70
71dbusdest=
72for d in $DOMAINS; do
73	dn="${d%%:*}"
74	ns="${d#*:}"
75	while [ -n "$ns" ]; do
76		if $dbus; then
77			SIFS=${IFS-y} OIFS=$IFS
78			IFS=.
79			set -- ${ns%%,*}
80			num="0x$(printf %02x $1 $2 $3 $4)"
81			if [ "$SIFS" = yi ]; then
82				unset IFS
83			else
84				IFS=$OIFS
85			fi
86			dbusdest="$dbusdest uint32:$(printf %u $num)"
87			dbusdest="$dbusdest string:$dn"
88		else
89			newconf="${newconf}server=/$dn/${ns%%,*}$NL"
90		fi
91		[ "$ns" = "${ns#*,}" ] && break
92		ns="${ns#*,}"
93	done
94done
95
96changed=false
97if [ -n "$dnsmasq_conf" ]; then
98	if [ ! -f "$dnsmasq_conf" ] || \
99		[ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ]
100	then
101		changed=true
102		printf %s "$newconf" >"$dnsmasq_conf"
103	fi
104fi
105if [ -n "$dnsmasq_resolv" ]; then
106	if [ -f "$dnsmasq_resolv" ]; then
107		if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ]
108		then
109			changed=true
110			printf %s "$newresolv" >"$dnsmasq_resolv"
111		fi
112	else
113		# dnsmasq polls this file so no need to set changed=true
114		printf %s "$newresolv" >"$dnsmasq_resolv"
115	fi
116fi
117
118if $changed; then
119	eval $dnsmasq_restart
120fi
121if $dbus; then
122	$changed || kill -HUP $(cat "$dnsmasq_pid")
123	# Send even if empty so old servers are cleared
124	dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
125 		/uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \
126  		$dbusdest
127fi
128