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)" 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 newconf="$newconf$NL# Domain specific servers will" 62 newconf="$newconf be sent over dbus${NL}enable-dbus$NL" 63 fi 64 fi 65fi 66 67for n in $NAMESERVERS; do 68 newresolv="${newresolv}nameserver $n$NL" 69done 70 71dbusdest= 72for d in $DOMAINS; do 73 dn="${d%%:*}" 74 ns="${d#*:}" 75 while [ -n "$ns" ]; do 76 if $dbus; then 77 SIFS=${IFS-y} OIFS=$IFS 78 IFS=. 79 set -- ${ns%%,*} 80 num="0x$(printf %02x $1 $2 $3 $4)" 81 if [ "$SIFS" = yi ]; then 82 unset IFS 83 else 84 IFS=$OIFS 85 fi 86 dbusdest="$dbusdest uint32:$(printf %u $num)" 87 dbusdest="$dbusdest string:$dn" 88 else 89 newconf="${newconf}server=/$dn/${ns%%,*}$NL" 90 fi 91 [ "$ns" = "${ns#*,}" ] && break 92 ns="${ns#*,}" 93 done 94done 95 96changed=false 97if [ -n "$dnsmasq_conf" ]; then 98 if [ ! -f "$dnsmasq_conf" ] || \ 99 [ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ] 100 then 101 changed=true 102 printf %s "$newconf" >"$dnsmasq_conf" 103 fi 104fi 105if [ -n "$dnsmasq_resolv" ]; then 106 if [ -f "$dnsmasq_resolv" ]; then 107 if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ] 108 then 109 changed=true 110 printf %s "$newresolv" >"$dnsmasq_resolv" 111 fi 112 else 113 # dnsmasq polls this file so no need to set changed=true 114 printf %s "$newresolv" >"$dnsmasq_resolv" 115 fi 116fi 117 118if $changed; then 119 eval $dnsmasq_restart 120fi 121if $dbus; then 122 $changed || kill -HUP $(cat "$dnsmasq_pid") 123 # Send even if empty so old servers are cleared 124 dbus-send --system --dest=uk.org.thekelleys.dnsmasq \ 125 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \ 126 $dbusdest 127fi 128