contrib/openresolv/dnsmasq.in

   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 ${dnsmasq_service}@}
  38 newconf="# Generated by resolvconf\n"
  39 newresolv="$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
  46 dbus=false
  47 : ${dbus_pid:=/var/run/dbus/dbus.pid}
  48 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid
  49 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid
  50 if [ -s "$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
  63 fi
  64
  65 for n in $NAMESERVERS; do
  66         newresolv="${newresolv}nameserver $n\n"
  67 done
  68
  69 dbusdest=
  70 for 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="${ns#*,}"
  91         done
  92 done
  93
  94 changed=false
  95 if [ -n "$dnsmasq_conf" ]; then
  96         if [ ! -f "$dnsmasq_conf" ] || \
  97                 [ "$(cat "$dnsmasq_conf")" != "$(printf "$newconf")" ]
  98         then
  99                 changed=true
 100                 printf "$newconf" >"$dnsmasq_conf"
 101         fi
 102 fi
 103 if [ -n "$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
 114 fi
 115
 116 if $changed; then
 117         eval $dnsmasq_restart
 118 fi
 119 if $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
 125 fi