dnsmasq.in revision 1.1.1.10
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 "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)" 33NL=" 34" 35 36: ${dnsmasq_pid:=/var/run/dnsmasq.pid} 37[ -s "$dnsmasq_pid" ] || dnsmasq_pid=/var/run/dnsmasq/dnsmasq.pid 38[ -s "$dnsmasq_pid" ] || unset dnsmasq_pid 39: ${dnsmasq_service:=dnsmasq} 40: ${dnsmasq_restart:=@RESTARTCMD ${dnsmasq_service}@} 41newconf="# Generated by resolvconf$NL" 42newresolv="$newconf" 43 44# Using dbus means that we never have to restart the daemon 45# This is important as it means we should not drop DNS queries 46# whilst changing DNS options around. However, dbus support is optional 47# so we need to validate a few things first. 48# Check for DBus support in the binary 49dbus=false 50dbus_ex=false 51dbus_introspect=$(dbus-send --print-reply --system \ 52 --dest=uk.org.thekelleys.dnsmasq \ 53 /uk/org/thekelleys/dnsmasq \ 54 org.freedesktop.DBus.Introspectable.Introspect \ 55 2>/dev/null) 56if [ $? = 0 ]; then 57 dbus=true 58 if printf %s "$dbus_introspect" | \ 59 grep -q '<method name="SetDomainServers">' 60 then 61 dbus_ex=true 62 fi 63fi 64 65for n in $NAMESERVERS; do 66 newresolv="${newresolv}nameserver $n$NL" 67done 68 69dbusdest= 70dbusdest_ex= 71conf= 72for d in $DOMAINS; do 73 dn="${d%%:*}" 74 ns="${d#*:}" 75 while [ -n "$ns" ]; do 76 n="${ns%%,*}" 77 if $dbus && ! $dbus_ex; then 78 case "$n" in 79 *.*.*.*) 80 SIFS=${IFS-y} OIFS=$IFS 81 IFS=. 82 set -- $n 83 num="0x$(printf %02x $1 $2 $3 $4)" 84 if [ "$SIFS" = y ]; then 85 unset IFS 86 else 87 IFS=$OIFS 88 fi 89 dbusdest="$dbusdest uint32:$(printf %u $num)" 90 dbusdest="$dbusdest string:$dn" 91 ;; 92 *:*%*) 93 # This version of dnsmasq won't accept 94 # scoped IPv6 addresses 95 dbus=false 96 ;; 97 *:*) 98 SIFS=${IFS-y} OIFS=$IFS bytes= front= back= 99 empty=false i=0 100 IFS=: 101 set -- $n 102 while [ -n "$1" -o -n "$2" ]; do 103 addr="$1" 104 shift 105 if [ -z "$addr" ]; then 106 empty=true 107 continue 108 fi 109 i=$(($i + 1)) 110 while [ ${#addr} -lt 4 ]; do 111 addr="0${addr}" 112 done 113 byte1="$(printf %d 0x${addr%??})" 114 byte2="$(printf %d 0x${addr#??})" 115 if $empty; then 116 back="$back byte:$byte1 byte:$byte2" 117 else 118 front="$front byte:$byte1 byte:$byte2" 119 fi 120 done 121 while [ $i != 8 ]; do 122 i=$(($i + 1)) 123 front="$front byte:0 byte:0" 124 done 125 front="${front}$back" 126 if [ "$SIFS" = y ]; then 127 unset IFS 128 else 129 IFS=$OIFS 130 fi 131 dbusdest="${dbusdest}$front string:$dn" 132 ;; 133 *) 134 if ! $dbus_ex; then 135 dbus=false 136 fi 137 ;; 138 esac 139 fi 140 dbusdest_ex="$dbusdest_ex${dbusdest_ex:+,}/$dn/$n" 141 conf="${conf}server=/$dn/$n$NL" 142 [ "$ns" = "${ns#*,}" ] && break 143 ns="${ns#*,}" 144 done 145done 146 147if $dbus; then 148 newconf="$newconf$NL# Domain specific servers will" 149 newconf="$newconf be sent over dbus${NL}" 150else 151 newconf="$newconf$conf" 152fi 153 154# Try to ensure that config dirs exist 155if type config_mkdirs >/dev/null 2>&1; then 156 config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv" 157else 158 @SBINDIR@/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv" 159fi 160 161changed=false 162if [ -n "$dnsmasq_conf" ]; then 163 if [ ! -f "$dnsmasq_conf" ] || \ 164 [ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ] 165 then 166 changed=true 167 printf %s "$newconf" >"$dnsmasq_conf" 168 fi 169fi 170if [ -n "$dnsmasq_resolv" ]; then 171 # dnsmasq polls this file so no need to set changed=true 172 if [ -f "$dnsmasq_resolv" ]; then 173 if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ] 174 then 175 printf %s "$newresolv" >"$dnsmasq_resolv" 176 fi 177 else 178 printf %s "$newresolv" >"$dnsmasq_resolv" 179 fi 180fi 181 182if $changed; then 183 eval $dnsmasq_restart 184fi 185if $dbus; then 186 if [ -s "$dnsmasq_pid" ]; then 187 $changed || kill -HUP $(cat "$dnsmasq_pid") 188 fi 189 # Send even if empty so old servers are cleared 190 if $dbus_ex; then 191 method=SetDomainServers 192 if [ -n "$dbusdest_ex" ]; then 193 dbusdest_ex="array:string:$dbusdest_ex" 194 fi 195 dbusdest="$dbusdest_ex" 196 else 197 method=SetServers 198 fi 199 dbus-send --system --dest=uk.org.thekelleys.dnsmasq \ 200 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.$method \ 201 $dbusdest 202fi 203