contrib/openresolv/dnsmasq.in

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