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