Release openresolv-3.5.3
[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_ex=false
50 : ${dbus_pid:=/var/run/dbus/dbus.pid}
51 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid
52 [ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid
53 if [ -s "$dbus_pid" -a -s "$dnsmasq_pid" ]; then
54         if dnsmasq --version 2>/dev/null | \
55                 grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]"
56         then
57                 # Sanity - check that dnsmasq and dbus are running
58                 if kill -0 $(cat "$dbus_pid") 2>/dev/null && \
59                         kill -0 $(cat "$dnsmasq_pid") 2>/dev/null
60                 then
61                         dbus=true
62                         if dbus-send --print-reply --system --dest=uk.org.thekelleys.dnsmasq /uk/org/thekelleys/dnsmasq org.freedesktop.DBus.Introspectable.Introspect | grep -q '<method name="SetDomainServers">'
63                         then
64                                 dbus_ex=true
65                         fi
66                 fi
67         fi
68 fi
69
70 for n in $NAMESERVERS; do
71         newresolv="${newresolv}nameserver $n$NL"
72 done
73
74 dbusdest=
75 dbusdest_ex=
76 conf=
77 for d in $DOMAINS; do
78         dn="${d%%:*}"
79         ns="${d#*:}"
80         while [ -n "$ns" ]; do
81                 n="${ns%%,*}"
82                 if $dbus && ! $dbus_ex; then
83                         case "$n" in
84                         *.*.*.*)
85                                 SIFS=${IFS-y} OIFS=$IFS
86                                 IFS=.
87                                 set -- $n
88                                 num="0x$(printf %02x $1 $2 $3 $4)"
89                                 if [ "$SIFS" = y ]; then
90                                         unset IFS
91                                 else
92                                         IFS=$OIFS
93                                 fi
94                                 dbusdest="$dbusdest uint32:$(printf %u $num)"
95                                 dbusdest="$dbusdest string:$dn"
96                                 ;;
97                         *:*%*)
98                                 # This version of dnsmasq won't accept
99                                 # scoped IPv6 addresses
100                                 dbus=false
101                                 ;;
102                         *:*)
103                                 SIFS=${IFS-y} OIFS=$IFS bytes= front= back=
104                                 empty=false i=0
105                                 IFS=:
106                                 set -- $n
107                                 while [ -n "$1" -o -n "$2" ]; do
108                                         addr="$1"
109                                         shift
110                                         if [ -z "$addr" ]; then
111                                                 empty=true
112                                                 continue
113                                         fi
114                                         i=$(($i + 1))
115                                         while [ ${#addr} -lt 4 ]; do
116                                                 addr="0${addr}"
117                                         done
118                                         byte1="$(printf %d 0x${addr%??})"
119                                         byte2="$(printf %d 0x${addr#??})"
120                                         if $empty; then
121                                                 back="$back byte:$byte1 byte:$byte2"
122                                         else
123                                                 front="$front byte:$byte1 byte:$byte2"
124                                         fi
125                                 done
126                                 while [ $i != 8 ]; do
127                                 i=$(($i + 1))
128                                         front="$front byte:0 byte:0"
129                                 done
130                                 front="${front}$back"
131                                 if [ "$SIFS" = y ]; then
132                                         unset IFS
133                                 else
134                                         IFS=$OIFS
135                                 fi
136                                 dbusdest="${dbusdest}$front string:$dn"
137                                 ;;
138                         *)
139                                 if ! $dbus_ex; then
140                                         dbus=false
141                                 fi
142                                 ;;
143                         esac
144                 fi
145                 dbusdest_ex="$dbusdest_ex${dbusdest_ex:+,}/$dn/$n"
146                 conf="${conf}server=/$dn/$n$NL"
147                 [ "$ns" = "${ns#*,}" ] && break
148                 ns="${ns#*,}"
149         done
150 done
151
152 if $dbus; then
153         newconf="$newconf$NL# Domain specific servers will"
154         newconf="$newconf be sent over dbus${NL}enable-dbus$NL"
155 else
156         newconf="$newconf$conf"
157 fi
158
159 # Try to ensure that config dirs exist
160 if type config_mkdirs >/dev/null 2>&1; then
161         config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv"
162 else
163         @PREFIX@/sbin/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv"
164 fi
165
166 changed=false
167 if [ -n "$dnsmasq_conf" ]; then
168         if [ ! -f "$dnsmasq_conf" ] || \
169                 [ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ]
170         then
171                 changed=true
172                 printf %s "$newconf" >"$dnsmasq_conf"
173         fi
174 fi
175 if [ -n "$dnsmasq_resolv" ]; then
176         # dnsmasq polls this file so no need to set changed=true
177         if [ -f "$dnsmasq_resolv" ]; then
178                 if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ]
179                 then
180                         printf %s "$newresolv" >"$dnsmasq_resolv"
181                 fi
182         else
183                 printf %s "$newresolv" >"$dnsmasq_resolv"
184         fi
185 fi
186
187 if $changed; then
188         eval $dnsmasq_restart
189 fi
190 if $dbus; then
191         $changed || kill -HUP $(cat "$dnsmasq_pid")
192         # Send even if empty so old servers are cleared
193         if $dbus_ex; then
194                 method=SetDomainServers
195                 if [ -n "$dbusdest_ex" ]; then
196                         dbusdest_ex="array:string:$dbusdest_ex"
197                 fi
198                 dbusdest="$dbusdest_ex"
199         else
200                 method=SetServers
201         fi
202         dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
203                 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.$method \
204                 $dbusdest
205 fi