dnsmasq.in revision 1.1.1.6 
1#!/bin/sh
2# Copyright (c) 2007-2012 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		fi
62	fi
63fi
64
65for n in $NAMESERVERS; do
66	newresolv="${newresolv}nameserver $n$NL"
67done
68
69dbusdest=
70conf=
71for d in $DOMAINS; do
72	dn="${d%%:*}"
73	ns="${d#*:}"
74	n="${ns%%,*}"
75	while [ -n "$ns" ]; do
76		case "$n" in
77		*.*.*.*)
78			SIFS=${IFS-y} OIFS=$IFS
79			IFS=.
80			set -- $n
81			num="0x$(printf %02x $1 $2 $3 $4)"
82			if [ "$SIFS" = y ]; then
83				unset IFS
84			else
85				IFS=$OIFS
86			fi
87			dbusdest="$dbusdest uint32:$(printf %u $num)"
88			dbusdest="$dbusdest string:$dn"
89			;;
90		*:*:*:*:*:*:*:*)
91			SIFS=${IFS-y} OIFS=$IFS bytes=
92			IFS=:
93			set -- $n
94			while [ -n "$1" ]; do
95				addr="$1"
96				shift
97				while [ ${#addr} -lt 4 ]; do
98					addr="0${addr}"
99				done
100				byte1="$(printf %d 0x${addr%??})"
101				byte2="$(printf %d 0x${addr#??})"
102				dbusdest="$dbusdest byte:$byte1 byte:$byte2"
103			done
104			if [ "$SIFS" = y ]; then
105				unset IFS
106			else
107				IFS=$OIFS
108			fi
109			dbusdest="$dbusdest string:$dn"
110			;;
111		*)
112			dbus=false
113			;;
114		esac
115		conf="${conf}server=/$dn/$n$NL"
116		[ "$ns" = "${ns#*,}" ] && break
117		ns="${ns#*,}"
118	done
119done
120
121if $dbus; then
122	newconf="$newconf$NL# Domain specific servers will"
123	newconf="$newconf be sent over dbus${NL}enable-dbus$NL"
124else
125	newconf="$newconf$conf"
126fi
127
128# Try to ensure that config dirs exist
129if type config_mkdirs >/dev/null 2>&1; then
130	config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv"
131else
132	@PREFIX@/sbin/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv"
133fi
134
135changed=false
136if [ -n "$dnsmasq_conf" ]; then
137	if [ ! -f "$dnsmasq_conf" ] || \
138		[ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ]
139	then
140		changed=true
141		printf %s "$newconf" >"$dnsmasq_conf"
142	fi
143fi
144if [ -n "$dnsmasq_resolv" ]; then
145	if [ -f "$dnsmasq_resolv" ]; then
146		if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ]
147		then
148			changed=true
149			printf %s "$newresolv" >"$dnsmasq_resolv"
150		fi
151	else
152		# dnsmasq polls this file so no need to set changed=true
153		printf %s "$newresolv" >"$dnsmasq_resolv"
154	fi
155fi
156
157if $changed; then
158	eval $dnsmasq_restart
159fi
160if $dbus; then
161	$changed || kill -HUP $(cat "$dnsmasq_pid")
162	# Send even if empty so old servers are cleared
163	dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
164 		/uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \
165  		$dbusdest
166fi
167