1#!/bin/sh 2# Copyright (c) 2007-2019 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 "${dnsmasq_conf}${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: ${dnsmasq_service:=dnsmasq} 40newconf="# Generated by resolvconf$NL" 41newresolv="$newconf" 42 43# Using dbus means that we never have to restart the daemon 44# This is important as it means we should not drop DNS queries 45# whilst changing DNS options around. However, dbus support is optional 46# so we need to validate a few things first. 47# Check for DBus support in the binary 48dbus=false 49dbus_ex=false 50dbus_introspect=$(dbus-send --print-reply --system \ 51 --dest=uk.org.thekelleys.dnsmasq \ 52 /uk/org/thekelleys/dnsmasq \ 53 org.freedesktop.DBus.Introspectable.Introspect \ 54 2>/dev/null) 55if [ $? = 0 ]; then 56 dbus=true 57 if printf %s "$dbus_introspect" | \ 58 grep -q '<method name="SetDomainServers">' 59 then 60 dbus_ex=true 61 fi 62fi 63 64for n in $NAMESERVERS; do 65 newresolv="${newresolv}nameserver $n$NL" 66done 67 68dbusdest= 69dbusdest_ex= 70conf= 71for d in $DOMAINS; do 72 dn="${d%%:*}" 73 ns="${d#*:}" 74 while [ -n "$ns" ]; do 75 n="${ns%%,*}" 76 if $dbus && ! $dbus_ex; then 77 case "$n" in 78 *.*.*.*) 79 SIFS=${IFS-y} OIFS=$IFS 80 IFS=. 81 set -- $n 82 num="0x$(printf %02x $1 $2 $3 $4)" 83 if [ "$SIFS" = y ]; then 84 unset IFS 85 else 86 IFS=$OIFS 87 fi 88 dbusdest="$dbusdest uint32:$(printf %u $num)" 89 dbusdest="$dbusdest string:$dn" 90 ;; 91 *:*%*) 92 # This version of dnsmasq won't accept 93 # scoped IPv6 addresses 94 dbus=false 95 ;; 96 *:*) 97 SIFS=${IFS-y} OIFS=$IFS bytes= front= back= 98 empty=false i=0 99 IFS=: 100 set -- $n 101 while [ -n "$1" ] || [ -n "$2" ]; do 102 addr="$1" 103 shift 104 if [ -z "$addr" ]; then 105 empty=true 106 continue 107 fi 108 i=$(($i + 1)) 109 while [ ${#addr} -lt 4 ]; do 110 addr="0${addr}" 111 done 112 byte1="$(printf %d 0x${addr%??})" 113 byte2="$(printf %d 0x${addr#??})" 114 if $empty; then 115 back="$back byte:$byte1 byte:$byte2" 116 else 117 front="$front byte:$byte1 byte:$byte2" 118 fi 119 done 120 while [ $i != 8 ]; do 121 i=$(($i + 1)) 122 front="$front byte:0 byte:0" 123 done 124 front="${front}$back" 125 if [ "$SIFS" = y ]; then 126 unset IFS 127 else 128 IFS=$OIFS 129 fi 130 dbusdest="${dbusdest}$front string:$dn" 131 ;; 132 *) 133 if ! $dbus_ex; then 134 dbus=false 135 fi 136 ;; 137 esac 138 fi 139 dbusdest_ex="$dbusdest_ex${dbusdest_ex:+,}/$dn/$n" 140 conf="${conf}server=/$dn/$n$NL" 141 [ "$ns" = "${ns#*,}" ] && break 142 ns="${ns#*,}" 143 done 144done 145 146if $dbus; then 147 newconf="$newconf$NL# Domain specific servers will" 148 newconf="$newconf be sent over dbus${NL}" 149else 150 newconf="$newconf$conf" 151fi 152 153# Try to ensure that config dirs exist 154if type config_mkdirs >/dev/null 2>&1; then 155 config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv" 156else 157 @SBINDIR@/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv" 158fi 159 160changed=false 161if [ -n "$dnsmasq_conf" ]; then 162 if [ ! -f "$dnsmasq_conf" ] || \ 163 [ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ] 164 then 165 changed=true 166 printf %s "$newconf" >"$dnsmasq_conf" 167 fi 168fi 169if [ -n "$dnsmasq_resolv" ]; then 170 # dnsmasq polls this file so no need to set changed=true 171 if [ -f "$dnsmasq_resolv" ]; then 172 if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ] 173 then 174 printf %s "$newresolv" >"$dnsmasq_resolv" 175 fi 176 else 177 printf %s "$newresolv" >"$dnsmasq_resolv" 178 fi 179fi 180 181if $changed; then 182 # dnsmasq does not re-read the configuration file on SIGHUP 183 if [ -n "$dnsmasq_restart" ]; then 184 eval $dnsmasq_restart 185 elif [ -n "$RESTARTCMD" ]; then 186 set -- ${dnsmasq_service} 187 eval "$RESTARTCMD" 188 else 189 @SBINDIR@/resolvconf -r ${dnsmasq_service} 190 fi 191fi 192if $dbus; then 193 if [ -s "$dnsmasq_pid" ]; then 194 $changed || kill -HUP $(cat "$dnsmasq_pid") 195 fi 196 # Send even if empty so old servers are cleared 197 if $dbus_ex; then 198 method=SetDomainServers 199 if [ -n "$dbusdest_ex" ]; then 200 dbusdest_ex="array:string:$dbusdest_ex" 201 fi 202 dbusdest="$dbusdest_ex" 203 else 204 method=SetServers 205 fi 206 dbus-send --system --dest=uk.org.thekelleys.dnsmasq \ 207 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.$method \ 208 $dbusdest 209 dbus-send --system --dest=uk.org.thekelleys.dnsmasq \ 210 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.ClearCache 211fi 212