sbin/newfs_msdos: Bring in FreeBSD/Git 902f77041b477be4d9d99608b463be01ac7611ea
[dragonfly.git] / contrib / openresolv / dnsmasq.in
1 #!/bin/sh
2 # Copyright (c) 2007-2016 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 "$RESOLVCONF" ] && eval "$(@SBINDIR@/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 [ -s "$dnsmasq_pid" ] || unset dnsmasq_pid
39 : ${dnsmasq_service:=dnsmasq}
40 newconf="# Generated by resolvconf$NL"
41 newresolv="$newconf"
42
43 # Using dbus means that we never have to restart the daemon
44 # This is important as it means we should not drop DNS queries
45 # whilst changing DNS options around. However, dbus support is optional
46 # so we need to validate a few things first.
47 # Check for DBus support in the binary
48 dbus=false
49 dbus_ex=false
50 dbus_introspect=$(dbus-send --print-reply --system \
51         --dest=uk.org.thekelleys.dnsmasq \
52         /uk/org/thekelleys/dnsmasq \
53         org.freedesktop.DBus.Introspectable.Introspect \
54         2>/dev/null)
55 if [ $? = 0 ]; then
56         dbus=true
57         if printf %s "$dbus_introspect" | \
58             grep -q '<method name="SetDomainServers">'
59         then
60                 dbus_ex=true
61         fi
62 fi
63
64 for n in $NAMESERVERS; do
65         newresolv="${newresolv}nameserver $n$NL"
66 done
67
68 dbusdest=
69 dbusdest_ex=
70 conf=
71 for d in $DOMAINS; do
72         dn="${d%%:*}"
73         ns="${d#*:}"
74         while [ -n "$ns" ]; do
75                 n="${ns%%,*}"
76                 if $dbus && ! $dbus_ex; then
77                         case "$n" in
78                         *.*.*.*)
79                                 SIFS=${IFS-y} OIFS=$IFS
80                                 IFS=.
81                                 set -- $n
82                                 num="0x$(printf %02x $1 $2 $3 $4)"
83                                 if [ "$SIFS" = y ]; then
84                                         unset IFS
85                                 else
86                                         IFS=$OIFS
87                                 fi
88                                 dbusdest="$dbusdest uint32:$(printf %u $num)"
89                                 dbusdest="$dbusdest string:$dn"
90                                 ;;
91                         *:*%*)
92                                 # This version of dnsmasq won't accept
93                                 # scoped IPv6 addresses
94                                 dbus=false
95                                 ;;
96                         *:*)
97                                 SIFS=${IFS-y} OIFS=$IFS bytes= front= back=
98                                 empty=false i=0
99                                 IFS=:
100                                 set -- $n
101                                 while [ -n "$1" -o -n "$2" ]; do
102                                         addr="$1"
103                                         shift
104                                         if [ -z "$addr" ]; then
105                                                 empty=true
106                                                 continue
107                                         fi
108                                         i=$(($i + 1))
109                                         while [ ${#addr} -lt 4 ]; do
110                                                 addr="0${addr}"
111                                         done
112                                         byte1="$(printf %d 0x${addr%??})"
113                                         byte2="$(printf %d 0x${addr#??})"
114                                         if $empty; then
115                                                 back="$back byte:$byte1 byte:$byte2"
116                                         else
117                                                 front="$front byte:$byte1 byte:$byte2"
118                                         fi
119                                 done
120                                 while [ $i != 8 ]; do
121                                 i=$(($i + 1))
122                                         front="$front byte:0 byte:0"
123                                 done
124                                 front="${front}$back"
125                                 if [ "$SIFS" = y ]; then
126                                         unset IFS
127                                 else
128                                         IFS=$OIFS
129                                 fi
130                                 dbusdest="${dbusdest}$front string:$dn"
131                                 ;;
132                         *)
133                                 if ! $dbus_ex; then
134                                         dbus=false
135                                 fi
136                                 ;;
137                         esac
138                 fi
139                 dbusdest_ex="$dbusdest_ex${dbusdest_ex:+,}/$dn/$n"
140                 conf="${conf}server=/$dn/$n$NL"
141                 [ "$ns" = "${ns#*,}" ] && break
142                 ns="${ns#*,}"
143         done
144 done
145
146 if $dbus; then
147         newconf="$newconf$NL# Domain specific servers will"
148         newconf="$newconf be sent over dbus${NL}"
149 else
150         newconf="$newconf$conf"
151 fi
152
153 # Try to ensure that config dirs exist
154 if type config_mkdirs >/dev/null 2>&1; then
155         config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv"
156 else
157         @SBINDIR@/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv"
158 fi
159
160 changed=false
161 if [ -n "$dnsmasq_conf" ]; then
162         if [ ! -f "$dnsmasq_conf" ] || \
163                 [ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ]
164         then
165                 changed=true
166                 printf %s "$newconf" >"$dnsmasq_conf"
167         fi
168 fi
169 if [ -n "$dnsmasq_resolv" ]; then
170         # dnsmasq polls this file so no need to set changed=true
171         if [ -f "$dnsmasq_resolv" ]; then
172                 if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ]
173                 then
174                         printf %s "$newresolv" >"$dnsmasq_resolv"
175                 fi
176         else
177                 printf %s "$newresolv" >"$dnsmasq_resolv"
178         fi
179 fi
180
181 if $changed; then
182         # dnsmasq does not re-read the configuration file on SIGHUP
183         if [ -n "$dnsmasq_restart" ]; then
184                 eval $dnsmasq_restart
185         elif [ -n "$RESTARTCMD" ]; then
186                 set -- ${dnsmasq_service}
187                 eval $RESTARTCMD
188         else
189                 @SBINDIR@/resolvconf -r ${dnsmasq_service}
190         fi
191 fi
192 if $dbus; then
193         if [ -s "$dnsmasq_pid" ]; then
194                 $changed || kill -HUP $(cat "$dnsmasq_pid")
195         fi
196         # Send even if empty so old servers are cleared
197         if $dbus_ex; then
198                 method=SetDomainServers
199                 if [ -n "$dbusdest_ex" ]; then
200                         dbusdest_ex="array:string:$dbusdest_ex"
201                 fi
202                 dbusdest="$dbusdest_ex"
203         else
204                 method=SetServers
205         fi
206         dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
207                 /uk/org/thekelleys/dnsmasq uk.org.thekelleys.$method \
208                 $dbusdest
209 fi