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 NL="
  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 ${dnsmasq_service}@}
  40 newconf="# Generated by resolvconf$NL"
  41 newresolv="$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
  48 dbus=false
  49 : ${dbus_pid:=/var/run/dbus/dbus.pid}
  50 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid
  51 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid
  52 if [ -s "$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
  65 fi
  66
  67 for n in $NAMESERVERS; do
  68         newresolv="${newresolv}nameserver $n$NL"
  69 done
  70
  71 dbusdest=
  72 for 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
  94 done
  95
  96 changed=false
  97 if [ -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
 104 fi
 105 if [ -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
 116 fi
 117
 118 if $changed; then
 119         eval $dnsmasq_restart
 120 fi
 121 if $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
 127 fi