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