Prefer /run and /libexec if found, otherwise fallback to /var/run and
[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 "$RESOLVCONF" ] && eval "$(@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                 fi
62         fi
63 fi
64
65 for n in $NAMESERVERS; do
66         newresolv="${newresolv}nameserver $n$NL"
67 done
68
69 dbusdest=
70 conf=
71 for d in $DOMAINS; do
72         dn="${d%%:*}"
73         ns="${d#*:}"
74         n="${ns%%,*}"
75         while [ -n "$ns" ]; do
76                 case "$n" in
77                 *.*.*.*)
78                         SIFS=${IFS-y} OIFS=$IFS
79                         IFS=.
80                         set -- $n
81                         num="0x$(printf %02x $1 $2 $3 $4)"
82                         if [ "$SIFS" = y ]; then
83                                 unset IFS
84                         else
85                                 IFS=$OIFS
86                         fi
87                         dbusdest="$dbusdest uint32:$(printf %u $num)"
88                         dbusdest="$dbusdest string:$dn"
89                         ;;
90                 *:*:*:*:*:*:*:*)
91                         SIFS=${IFS-y} OIFS=$IFS bytes=
92                         IFS=:
93                         set -- $n
94                         while [ -n "$1" ]; do
95                                 addr="$1"
96                                 shift
97                                 while [ ${#addr} -lt 4 ]; do
98                                         addr="0${addr}"
99                                 done
100                                 byte1="$(printf %d 0x${addr%??})"
101                                 byte2="$(printf %d 0x${addr#??})"
102                                 dbusdest="$dbusdest byte:$byte1 byte:$byte2"
103                         done
104                         if [ "$SIFS" = y ]; then
105                                 unset IFS
106                         else
107                                 IFS=$OIFS
108                         fi
109                         dbusdest="$dbusdest string:$dn"
110                         ;;
111                 *)
112                         dbus=false
113                         ;;
114                 esac
115                 conf="${conf}server=/$dn/$n$NL"
116                 [ "$ns" = "${ns#*,}" ] && break
117                 ns="${ns#*,}"
118         done
119 done
120
121 if $dbus; then
122         newconf="$newconf$NL# Domain specific servers will"
123         newconf="$newconf be sent over dbus${NL}enable-dbus$NL"
124 else
125         newconf="$newconf$conf"
126 fi
127
128 # Try to ensure that config dirs exist
129 if type config_mkdirs >/dev/null 2>&1; then
130         config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv"
131 else
132         @PREFIX@/sbin/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv"
133 fi
134
135 changed=false
136 if [ -n "$dnsmasq_conf" ]; then
137         if [ ! -f "$dnsmasq_conf" ] || \
138                 [ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ]
139         then
140                 changed=true
141                 printf %s "$newconf" >"$dnsmasq_conf"
142         fi
143 fi
144 if [ -n "$dnsmasq_resolv" ]; then
145         # dnsmasq polls this file so no need to set changed=true
146         if [ -f "$dnsmasq_resolv" ]; then
147                 if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ]
148                 then
149                         printf %s "$newresolv" >"$dnsmasq_resolv"
150                 fi
151         else
152                 printf %s "$newresolv" >"$dnsmasq_resolv"
153         fi
154 fi
155
156 if $changed; then
157         eval $dnsmasq_restart
158 fi
159 if $dbus; then
160         $changed || kill -HUP $(cat "$dnsmasq_pid")
161         # Send even if empty so old servers are cleared
162         dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
163                 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \
164                 $dbusdest
165 fi