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)" 33 34: ${dnsmasq_pid:=/var/run/dnsmasq.pid} 35[ -s "$dnsmasq_pid" ] || dnsmasq_pid=/var/run/dnsmasq/dnsmasq.pid 36: ${dnsmasq_service:=dnsmasq} 37: ${dnsmasq_restart:=@RESTARTCMD ${dnsmasq_service}@} 38newconf="# Generated by resolvconf\n" 39newresolv="$newconf" 40 41# Using dbus means that we never have to restart the daemon 42# This is important as it means we should not drop DNS queries 43# whilst changing DNS options around. However, dbus support is optional 44# so we need to validate a few things first. 45# Check for DBus support in the binary 46dbus=false 47: ${dbus_pid:=/var/run/dbus/dbus.pid} 48[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid 49[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid 50if [ -s "$dbus_pid" -a -s "$dnsmasq_pid" ]; then 51 if dnsmasq --version 2>/dev/null | \ 52 grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]" 53 then 54 # Sanity - check that dnsmasq and dbus are running 55 if kill -0 $(cat "$dbus_pid") 2>/dev/null && \ 56 kill -0 $(cat "$dnsmasq_pid") 2>/dev/null 57 then 58 dbus=true 59 newconf="$newconf\n# Domain specific servers will" 60 newconf="$newconf be sent over dbus\nenable-dbus\n" 61 fi 62 fi 63fi 64 65for n in $NAMESERVERS; do 66 newresolv="${newresolv}nameserver $n\n" 67done 68 69dbusdest= 70for d in $DOMAINS; do 71 dn="${d%%:*}" 72 ns="${d#*:}" 73 while [ -n "$ns" ]; do 74 if $dbus; then 75 SIFS=${IFS-y} OIFS=$IFS 76 IFS=. 77 set -- ${ns%%,*} 78 num="0x$(printf "%02x" $1 $2 $3 $4)" 79 if [ "$SIFS" = yi ]; then 80 unset IFS 81 else 82 IFS=$OIFS 83 fi 84 dbusdest="$dbusdest uint32:$(printf "%u" $num)" 85 dbusdest="$dbusdest string:$dn" 86 else 87 newconf="${newconf}server=/$dn/${ns%%,*}\n" 88 fi 89 [ "$ns" = "${ns#*,}" ] && break 90 ns="${ns#*,}" 91 done 92done 93 94changed=false 95if [ -n "$dnsmasq_conf" ]; then 96 if [ ! -f "$dnsmasq_conf" ] || \ 97 [ "$(cat "$dnsmasq_conf")" != "$(printf "$newconf")" ] 98 then 99 changed=true 100 printf "$newconf" >"$dnsmasq_conf" 101 fi 102fi 103if [ -n "$dnsmasq_resolv" ]; then 104 if [ -f "$dnsmasq_resolv" ]; then 105 if [ "$(cat "$dnsmasq_resolv")" != "$(printf "$newresolv")" ] 106 then 107 changed=true 108 printf "$newresolv" >"$dnsmasq_resolv" 109 fi 110 else 111 # dnsmasq polls this file so no need to set changed=true 112 printf "$newresolv" >"$dnsmasq_resolv" 113 fi 114fi 115 116if $changed; then 117 eval $dnsmasq_restart 118fi 119if $dbus; then 120 $changed || kill -HUP $(cat "$dnsmasq_pid") 121 # Send even if empty so old servers are cleared 122 dbus-send --system --dest=uk.org.thekelleys.dnsmasq \ 123 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \ 124 $dbusdest 125fi 126