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 49dbus_ex=false 50: ${dbus_pid:=/var/run/dbus/dbus.pid} 51[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid 52[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid 53if [ -s "$dbus_pid" -a -s "$dnsmasq_pid" ]; then 54 if dnsmasq --version 2>/dev/null | \ 55 grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]" 56 then 57 # Sanity - check that dnsmasq and dbus are running 58 if kill -0 $(cat "$dbus_pid") 2>/dev/null && \ 59 kill -0 $(cat "$dnsmasq_pid") 2>/dev/null 60 then 61 dbus=true 62 if dbus-send --print-reply --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq org.freedesktop.DBus.Introspectable.Introspect | grep -q '<method name="SetDomainServers">' 63 then 64 dbus_ex=true 65 fi 66 fi 67 fi 68fi 69 70for n in $NAMESERVERS; do 71 newresolv="${newresolv}nameserver $n$NL" 72done 73 74dbusdest= 75dbusdest_ex= 76conf= 77for d in $DOMAINS; do 78 dn="${d%%:*}" 79 ns="${d#*:}" 80 while [ -n "$ns" ]; do 81 n="${ns%%,*}" 82 if $dbus && ! $dbus_ex; then 83 case "$n" in 84 *.*.*.*) 85 SIFS=${IFS-y} OIFS=$IFS 86 IFS=. 87 set -- $n 88 num="0x$(printf %02x $1 $2 $3 $4)" 89 if [ "$SIFS" = y ]; then 90 unset IFS 91 else 92 IFS=$OIFS 93 fi 94 dbusdest="$dbusdest uint32:$(printf %u $num)" 95 dbusdest="$dbusdest string:$dn" 96 ;; 97 *:*%*) 98 # This version of dnsmasq won't accept 99 # scoped IPv6 addresses 100 dbus=false 101 ;; 102 *:*) 103 SIFS=${IFS-y} OIFS=$IFS bytes= front= back= 104 empty=false i=0 105 IFS=: 106 set -- $n 107 while [ -n "$1" -o -n "$2" ]; do 108 addr="$1" 109 shift 110 if [ -z "$addr" ]; then 111 empty=true 112 continue 113 fi 114 i=$(($i + 1)) 115 while [ ${#addr} -lt 4 ]; do 116 addr="0${addr}" 117 done 118 byte1="$(printf %d 0x${addr%??})" 119 byte2="$(printf %d 0x${addr#??})" 120 if $empty; then 121 back="$back byte:$byte1 byte:$byte2" 122 else 123 front="$front byte:$byte1 byte:$byte2" 124 fi 125 done 126 while [ $i != 8 ]; do 127 i=$(($i + 1)) 128 front="$front byte:0 byte:0" 129 done 130 front="${front}$back" 131 if [ "$SIFS" = y ]; then 132 unset IFS 133 else 134 IFS=$OIFS 135 fi 136 dbusdest="${dbusdest}$front string:$dn" 137 ;; 138 *) 139 if ! $dbus_ex; then 140 dbus=false 141 fi 142 ;; 143 esac 144 fi 145 dbusdest_ex="$dbusdest_ex${dbusdest_ex:+,}/$dn/$n" 146 conf="${conf}server=/$dn/$n$NL" 147 [ "$ns" = "${ns#*,}" ] && break 148 ns="${ns#*,}" 149 done 150done 151 152if $dbus; then 153 newconf="$newconf$NL# Domain specific servers will" 154 newconf="$newconf be sent over dbus${NL}enable-dbus$NL" 155else 156 newconf="$newconf$conf" 157fi 158 159# Try to ensure that config dirs exist 160if type config_mkdirs >/dev/null 2>&1; then 161 config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv" 162else 163 @PREFIX@/sbin/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv" 164fi 165 166changed=false 167if [ -n "$dnsmasq_conf" ]; then 168 if [ ! -f "$dnsmasq_conf" ] || \ 169 [ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ] 170 then 171 changed=true 172 printf %s "$newconf" >"$dnsmasq_conf" 173 fi 174fi 175if [ -n "$dnsmasq_resolv" ]; then 176 # dnsmasq polls this file so no need to set changed=true 177 if [ -f "$dnsmasq_resolv" ]; then 178 if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ] 179 then 180 printf %s "$newresolv" >"$dnsmasq_resolv" 181 fi 182 else 183 printf %s "$newresolv" >"$dnsmasq_resolv" 184 fi 185fi 186 187if $changed; then 188 eval $dnsmasq_restart 189fi 190if $dbus; then 191 $changed || kill -HUP $(cat "$dnsmasq_pid") 192 # Send even if empty so old servers are cleared 193 if $dbus_ex; then 194 method=SetDomainServers 195 if [ -n "$dbusdest_ex" ]; then 196 dbusdest_ex="array:string:$dbusdest_ex" 197 fi 198 dbusdest="$dbusdest_ex" 199 else 200 method=SetServers 201 fi 202 dbus-send --system --dest=uk.org.thekelleys.dnsmasq \ 203 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.$method \ 204 $dbusdest 205fi 206