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[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 : ${dnsmasq_restart:=@RESTARTCMD dnsmasq@}
37 newconf="# Generated by resolvconf\n"
38 newresolv="$newconf"
39
40 # Using dbus means that we never have to restart the daemon
41 # This is important as it means we should not drop DNS queries
42 # whilst changing DNS options around. However, dbus support is optional
43 # so we need to validate a few things first.
44 # Check for DBus support in the binary
45 dbus=false
46 : ${dbus_pid:=/var/run/dbus/dbus.pid}
47 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid
48 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid
49 if [ -s "$dbus_pid" -a -s "$dnsmasq_pid" ]; then
50         if dnsmasq --version 2>/dev/null | \
51                 grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]"
52         then
53                 # Sanity - check that dnsmasq and dbus are running
54                 if kill -0 $(cat "$dbus_pid") 2>/dev/null && \
55                         kill -0 $(cat "$dnsmasq_pid") 2>/dev/null
56                 then
57                         dbus=true
58                         newconf="$newconf\n# Domain specific servers will"
59                         newconf="$newconf be sent over dbus\nenable-dbus\n"
60                 fi
61         fi
62 fi
63
64 for n in $NAMESERVERS; do
65         newresolv="${newresolv}nameserver $n\n"
66 done
67
68 dbusdest=
69 for d in $DOMAINS; do
70         dn="${d%%:*}"
71         ns="${d#*:}"
72         while [ -n "$ns" ]; do
73                 if $dbus; then
74                         SIFS=${IFS-y} OIFS=$IFS
75                         IFS=.
76                         set -- ${ns%%,*}
77                         num="0x$(printf "%02x" $1 $2 $3 $4)"
78                         if [ "$SIFS" = yi ]; then
79                                 unset IFS
80                         else
81                                 IFS=$OIFS
82                         fi
83                         dbusdest="$dbusdest uint32:$(printf "%u" $num)"
84                         dbusdest="$dbusdest string:$dn"
85                 else
86                         newconf="${newconf}server=/$dn/${ns%%,*}\n"
87                 fi
88                 [ "$ns" = "${ns#*,}" ] && break
89                 ns="${ns#*,}"
90         done
91 done
92
93 changed=false
94 if [ -n "$dnsmasq_conf" ]; then
95         if [ ! -f "$dnsmasq_conf" ] || \
96                 [ "$(cat "$dnsmasq_conf")" != "$(printf "$newconf")" ]
97         then
98                 changed=true
99                 printf "$newconf" >"$dnsmasq_conf"
100         fi
101 fi
102 if [ -n "$dnsmasq_resolv" ]; then
103         if [ -f "$dnsmasq_resolv" ]; then
104                 if [ "$(cat "$dnsmasq_resolv")" != "$(printf "$newresolv")" ]
105                 then
106                         changed=true
107                         printf "$newresolv" >"$dnsmasq_resolv"
108                 fi
109         else
110                 # dnsmasq polls this file so no need to set changed=true
111                 printf "$newresolv" >"$dnsmasq_resolv"
112         fi
113 fi
114
115 if $changed; then
116         eval $dnsmasq_restart
117 fi
118 if $dbus; then
119         $changed || kill -HUP $(cat "$dnsmasq_pid")
120         # Send even if empty so old servers are cleared
121         dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
122                 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \
123                 $dbusdest
124 fi