Merge branch 'vendor/OPENRESOLV' with the following changes:
[dragonfly.git] / contrib / openresolv / pdnsd.in
1 #!/bin/sh
2 # Copyright (c) 2010-2018 Roy Marples
3 # All rights reserved
4
5 # pdnsd 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 "${pdnsd_conf}${pdnsd_resolv}" ] && exit 0
32 [ -z "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)"
33 NL="
34 "
35
36 : ${pdnsd_restart:=pdnsd-ctl config $pdnsd_conf}
37 signature="# Generated by resolvconf"
38 signature_end="# End of resolvconf"
39
40 # We normally use sed to remove markers from a configuration file
41 # but sed may not always be available at the time.
42 remove_markers()
43 {
44         m1="$1"
45         m2="$2"
46         in_marker=0
47
48         shift; shift
49         if type sed >/dev/null 2>&1; then
50                 sed "/^$m1/,/^$m2/d" $@
51         else
52                 for x do
53                         while read line; do
54                                 case "$line" in
55                                 "$m1"*) in_marker=1;;
56                                 "$m2"*) in_marker=0;;
57                                 *) [ $in_marker = 0 ] && echo "$line";;
58                                 esac
59                         done < "$x"
60                 done
61         fi
62 }
63
64 # Compare two files
65 # If different, replace first with second otherwise remove second
66 change_file()
67 {
68         if [ -e "$1" ]; then
69                 if type cmp >/dev/null 2>&1; then
70                         cmp -s "$1" "$2"
71                 elif type diff >/dev/null 2>&1; then
72                         diff -q "$1" "$2" >/dev/null
73                 else
74                         # Hopefully we're only working on small text files ...
75                         [ "$(cat "$1")" = "$(cat "$2")" ]
76                 fi
77                 if [ $? -eq 0 ]; then
78                         rm -f "$2"
79                         return 1
80                 fi
81         fi
82         cat "$2" > "$1"
83         rm -f "$2"
84         return 0
85 }
86
87 newresolv="# Generated by resolvconf$NL"
88 changed=false
89
90 # Try to ensure that config dirs exist
91 if type config_mkdirs >/dev/null 2>&1; then
92         config_mkdirs "$pdnsd_resolv" "$pdnsd_conf"
93 else
94         @SBINDIR@/resolvconf -D "$pdnsd_resolv" "$pdnsd_conf"
95 fi
96
97 if [ -n "$pdnsd_resolv" ]; then
98         for n in $NAMESERVERS; do
99                 newresolv="${newresolv}nameserver $n$NL"
100         done
101 fi
102
103 # Only modify the configuration if it exists and we can write to it
104 if [ -w "$pdnsd_conf" ]; then
105         cf="$pdnsd_conf.new"
106         newconf=
107
108         if [ -z "$pdnsd_resolv" ]; then
109                 newconf="${newconf}server {$NL"
110                 newconf="${newconf}     label=resolvconf;$NL"
111                 if [ -n "$NAMESERVERS" ]; then
112                         newconf="${newconf}     ip="
113                         first=true
114                         for n in $NAMESERVERS; do
115                                 if $first; then
116                                         first=false
117                                 else
118                                         newconf="${newconf},"
119                                 fi
120                                 newconf="$newconf$n"
121                         done
122                         newconf="${newconf};$NL"
123                 fi
124                 newconf="${newconf}}$NL"
125         fi
126
127         for d in $DOMAINS; do
128                 newconf="${newconf}server {$NL"
129                 newconf="${newconf}     include=.${d%%:*}.;$NL"
130                 newconf="${newconf}     policy=excluded;$NL"
131                 newconf="${newconf}     ip="
132                 ns="${d#*:}"
133                 while [ -n "$ns" ]; do
134                         newconf="${newconf}${ns%%,*}"
135                         [ "$ns" = "${ns#*,}" ] && break
136                         ns="${ns#*,}"
137                         newconf="${newconf},"
138                 done
139                 newconf="${newconf};$NL}$NL"
140         done
141
142         rm -f "$cf"
143         remove_markers "$signature" "$signature_end" "$pdnsd_conf" > "$cf"
144         if [ -n "$newconf" ]; then
145                 echo "$signature" >> "$cf"
146                 printf %s "$newconf" >> "$cf"
147                 echo "$signature_end" >> "$cf"
148         fi
149         if change_file "$pdnsd_conf" "$cf"; then
150                 changed=true
151         fi
152 fi
153
154 if [ -n "$pdnsd_resolv" ]; then
155         if [ ! -f "$pdnsd_resolv" ] || \
156                 [ "$(cat "$pdnsd_resolv")" != "$(printf %s "$newresolv")" ]
157         then
158                 changed=true
159                 printf %s "$newresolv" >"$pdnsd_resolv"
160         fi
161 fi
162
163 if $changed; then
164         eval $pdnsd_restart
165 fi