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[dragonfly.git] / contrib / openresolv / pdnsd.in
1 #!/bin/sh
2 # Copyright (c) 2010-2013 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 "$pdnsd_conf" -a -z "$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         local m1="$1" m2="$2" x= line= in_marker=0
45
46         shift; shift
47         if type sed >/dev/null 2>&1; then
48                 sed "/^$m1/,/^$m2/d" $@
49         else
50                 for x; do
51                         while read -r line; do
52                                 case "$line" in
53                                 "$m1"*) in_marker=1;;
54                                 "$m2"*) in_marker=0;;
55                                 *) [ $in_marker = 0 ] && echo "$line";;
56                                 esac
57                         done < "$x"
58                 done
59         fi
60 }
61
62 # Compare two files
63 # If different, replace first with second otherwise remove second
64 change_file()
65 {
66         if [ -e "$1" ]; then
67                 if type cmp >/dev/null 2>&1; then
68                         cmp -s "$1" "$2"
69                 elif type diff >/dev/null 2>&1; then
70                         diff -q "$1" "$2" >/dev/null
71                 else
72                         # Hopefully we're only working on small text files ...
73                         [ "$(cat "$1")" = "$(cat "$2")" ]
74                 fi
75                 if [ $? -eq 0 ]; then
76                         rm -f "$2"
77                         return 1
78                 fi
79         fi
80         cat "$2" > "$1"
81         rm -f "$2"
82         return 0
83 }
84
85 newresolv="# Generated by resolvconf$NL"
86 changed=false
87
88 # Try to ensure that config dirs exist
89 if type config_mkdirs >/dev/null 2>&1; then
90         config_mkdirs "$pdnsd_resolv" "$pdnsd_conf"
91 else
92         @SBINDIR@/resolvconf -D "$pdnsd_resolv" "$pdnsd_conf"
93 fi
94
95 if [ -n "$pdnsd_resolv" ]; then
96         for n in $NAMESERVERS; do
97                 newresolv="${newresolv}nameserver $n$NL"
98         done
99 fi
100
101 # Only modify the configuration if it exists and we can write to it
102 if [ -w "$pdnsd_conf" ]; then
103         cf="$pdnsd_conf.new"
104         newconf=
105
106         if [ -z "$pdnsd_resolv" ]; then
107                 newconf="${newconf}server {$NL"
108                 newconf="${newconf}     label=resolvconf;$NL"
109                 if [ -n "$NAMESERVERS" ]; then
110                         newconf="${newconf}     ip="
111                         first=true
112                         for n in $NAMESERVERS; do
113                                 if $first; then
114                                         first=false
115                                 else
116                                         newconf="${newconf},"
117                                 fi
118                                 newconf="$newconf$n"
119                         done
120                         newconf="${newconf};$NL"
121                 fi
122                 newconf="${newconf}}$NL"
123         fi
124
125         for d in $DOMAINS; do
126                 newconf="${newconf}server {$NL"
127                 newconf="${newconf}     include=.${d%%:*}.;$NL"
128                 newconf="${newconf}     policy=excluded;$NL"
129                 newconf="${newconf}     ip="
130                 ns="${d#*:}"
131                 while [ -n "$ns" ]; do
132                         newconf="${newconf}${ns%%,*}"
133                         [ "$ns" = "${ns#*,}" ] && break
134                         ns="${ns#*,}"
135                         newconf="${newconf},"
136                 done
137                 newconf="${newconf};$NL}$NL"
138         done
139
140         rm -f "$cf"
141         remove_markers "$signature" "$signature_end" "$pdnsd_conf" > "$cf"
142         if [ -n "$newconf" ]; then
143                 echo "$signature" >> "$cf"
144                 printf %s "$newconf" >> "$cf"
145                 echo "$signature_end" >> "$cf"
146         fi
147         if change_file "$pdnsd_conf" "$cf"; then
148                 changed=true
149         fi
150 fi
151
152 if [ -n "$pdnsd_resolv" ]; then
153         if [ ! -f "$pdnsd_resolv" ] || \
154                 [ "$(cat "$pdnsd_resolv")" != "$(printf %s "$newresolv")" ]
155         then
156                 changed=true
157                 printf %s "$newresolv" >"$pdnsd_resolv"
158         fi
159 fi
160
161 if $changed; then
162         eval $pdnsd_restart
163 fi