Fix for Makefile syntax.
[openresolv] / resolvconf.in
1 #!/bin/sh
2 # Copyright (c) 2007-2009 Roy Marples
3 # All rights reserved
4
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions
7 # are met:
8 #     * Redistributions of source code must retain the above copyright
9 #       notice, this list of conditions and the following disclaimer.
10 #     * Redistributions in binary form must reproduce the above
11 #       copyright notice, this list of conditions and the following
12 #       disclaimer in the documentation and/or other materials provided
13 #       with the distribution.
14 #
15 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 RESOLVCONF="$0"
28 SYSCONFDIR=@SYSCONFDIR@
29 LIBEXECDIR=@LIBEXECDIR@
30 VARDIR=@VARDIR@
31 # Support original resolvconf configuration layout
32 # as well as the openresolv config file
33 if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then
34         . "$SYSCONFDIR"/resolvconf.conf
35         [ -n "$state_dir" ] && VARDIR="$state_dir"
36 elif [ -d "$SYSCONFDIR/resolvconf" ]; then
37         SYSCONFDIR="$SYSCONFDIR/resolvconf"
38         if [ -f "$SYSCONFDIR"/interface-order ]; then
39                 interface_order="$(cat "$SYSCONFDIR"/interface-order)"
40         fi
41 fi
42 IFACEDIR="$VARDIR/interfaces"
43 METRICDIR="$VARDIR/metrics"
44 PRIVATEDIR="$VARDIR/private"
45
46 : ${dynamic_order:=tap[0-9]* tun[0-9]* vpn vpn[0-9]* ppp[0-9]* ippp[0-9]*}
47 : ${interface_order:=lo lo[0-9]*}
48
49 error_exit()
50 {
51         echo "$*" >&2
52         exit 1
53 }
54
55 usage()
56 {
57         cat <<-EOF
58         Usage: ${RESOLVCONF##*/} [options]
59
60         Inform the system about any DNS updates.
61
62         Options:
63           -a \$INTERFACE    Add DNS information to the specified interface
64                            (DNS supplied via stdin in resolv.conf format)
65           -m metric        Give the added DNS information a metric
66           -p               Mark the interface as private
67           -d \$INTERFACE    Delete DNS information from the specified interface
68           -f               Ignore non existant interfaces
69           -I               Init the state dir
70           -u               Run updates from our current DNS information
71           -l [\$PATTERN]    Show DNS information, optionally from interfaces
72                            that match the specified pattern
73           -i [\$PATTERN]    Show interfaces that have supplied DNS information
74                    optionally from interfaces that match the specified
75                    pattern
76           -v [\$PATTERN]    echo NEWDOMAIN, NEWSEARCH and NEWNS variables to
77                            the console
78           -h               Show this help cruft
79         EOF
80         [ -z "$1" ] && exit 0
81         echo
82         error_exit "$*"
83 }
84
85 echo_resolv()
86 {
87         local line=
88         [ -n "$1" -a -e "$IFACEDIR/$1" ] || return 1
89         echo "# resolv.conf from $1"
90         # Our variable maker works of the fact each resolv.conf per interface
91         # is separated by blank lines.
92         # So we remove them when echoing them.
93         while read line; do
94                 [ -n "$line" ] && echo "$line"
95         done < "$IFACEDIR/$1"
96         echo
97 }
98
99 # Parse resolv.conf's and make variables
100 # for domain name servers, search name servers and global nameservers
101 parse_resolv()
102 {
103         local line= ns= ds= search= d= n= newns=
104         local new=true iface= private=false p=
105
106         echo "DOMAINS="
107         echo "SEARCH=\"$search_domains\""
108         # let our subscribers know about global nameservers
109         for n in $name_servers; do
110                 case "$n" in
111                 127.*|0.0.0.0|255.255.255.255|::1) :;;
112                 *) newns="$newns${newns:+ }$n";;
113                 esac
114         done
115         echo "NAMESERVERS=\"$newns\""
116         echo "LOCALNAMESERVERS="
117         newns=
118
119         while read line; do
120                 case "$line" in
121                 "# resolv.conf from "*)
122                         if ${new}; then
123                                 iface="${line#\# resolv.conf from *}"
124                                 new=false
125                                 if [ -e "$PRIVATEDIR/$iface" ]; then
126                                         private=true
127                                 else
128                                         # Allow expansion
129                                         cd "$IFACEDIR"
130                                         private=false
131                                         for p in $private_interfaces; do
132                                                 if [ "$p" = "$iface" ]; then
133                                                         private=true
134                                                         break
135                                                 fi
136                                         done
137                                 fi
138                         fi
139                         ;;
140                 "nameserver "*)
141                         case "${line#* }" in
142                         127.*|0.0.0.0|255.255.255.255|::1)
143                                 echo "LOCALNAMESERVERS=\"\$LOCALNAMESERVERS ${line#* }\""
144                                 continue
145                                 ;;
146                         esac
147                         ns="$ns${line#* } "
148                         ;;
149                 "domain "*|"search "*)
150                         search="${line#* }"
151                         ;;
152                 *)
153                         [ -n "$line" ] && continue
154                         if [ -n "$ns" -a -n "$search" ]; then
155                                 newns=
156                                 for n in $ns; do
157                                         newns="$newns${newns:+,}$n"
158                                 done
159                                 ds=
160                                 for d in $search; do
161                                         ds="$ds${ds:+ }$d:$newns"
162                                 done
163                                 echo "DOMAINS=\"\$DOMAINS $ds\""
164                         fi
165                         echo "SEARCH=\"\$SEARCH $search\""
166                         if ! $private; then
167                                 echo "NAMESERVERS=\"\$NAMESERVERS $ns\""
168                         fi
169                         ns=
170                         search=
171                         new=true
172                         ;;
173                 esac
174         done
175 }
176
177 uniqify()
178 {
179         local result=
180         while [ -n "$1" ]; do
181                 case " $result " in
182                 *" $1 "*);;
183                 *) result="$result $1";;
184                 esac
185                 shift
186         done
187         echo "${result# *}"
188 }
189
190 list_resolv()
191 {
192         [ -d "$IFACEDIR" ] || return 0
193
194         local report=false list= retval=0 cmd="$1"
195         shift
196
197         # If we have an interface ordering list, then use that.
198         # It works by just using pathname expansion in the interface directory.
199         if [ -n "$1" ]; then
200                 list="$@"
201                 $force || report=true
202         else
203                 cd "$IFACEDIR"
204                 for i in $interface_order; do
205                         [ -e "$i" ] && list="$list $i"
206                 done
207                 for i in $dynamic_order; do
208                         if [ -e "$i" -a ! -e "$METRICDIR/"*" $i" ]; then
209                                 list="$list $i"
210                         fi
211                 done
212                 if [ -d "$METRICDIR" ]; then
213                         cd "$METRICDIR"
214                         for i in *; do
215                                 list="$list ${i#* }"
216                         done
217                 fi
218                 list="$list *"
219         fi
220
221         cd "$IFACEDIR"
222         for i in $(uniqify $list); do
223                 # Only list interfaces which we really have
224                 if ! [ -e "$i" ]; then
225                         if $report; then
226                                 echo "No resolv.conf for interface $i" >&2
227                                 retval=$(($retval + 1))
228                         fi
229                         continue
230                 fi
231                 
232                 if [ "$cmd" = i -o "$cmd" = "-i" ]; then
233                         printf "$i "
234                 else
235                         echo_resolv "$i"
236                 fi
237         done
238         [ "$cmd" = i -o "$cmd" = "-i" ] && echo
239         return $retval
240 }
241
242 make_vars()
243 {
244         eval "$(list_resolv -l "$@" | parse_resolv)"
245
246         # Ensure that we only list each domain once
247         newdomains=
248         for d in $DOMAINS; do
249                 dn="${d%%:*}"
250                 case " $newdomains" in
251                 *" ${dn}:"*) continue;;
252                 esac
253                 newdomains="$newdomains${newdomains:+ }$dn:"
254                 newns=
255                 for nd in $DOMAINS; do
256                         if [ "$dn" = "${nd%%:*}" ]; then
257                                 ns="${nd#*:}"
258                                 while [ -n "$ns" ]; do
259                                         case ",$newns," in
260                                         *,${ns%%,*},*) ;;
261                                         *) newns="$newns${newns:+,}${ns%%,*}";;
262                                         esac
263                                         [ "$ns" = "${ns#*,}" ] && break
264                                         ns="${ns#*,}"
265                                 done
266                         fi
267                 done
268                 newdomains="$newdomains$newns"
269         done
270         echo "DOMAINS='$newdomains'"
271         echo "SEARCH='$(uniqify $SEARCH)'"
272         echo "NAMESERVERS='$(uniqify $NAMESERVERS)'"
273         echo "LOCALNAMESERVERS='$(uniqify $LOCALNAMESERVERS)'"
274 }
275
276 force=false
277 while getopts a:d:fhIilm:puv OPT; do
278         case "$OPT" in
279         f) force=true;;
280         h) usage;;
281         m) IF_METRIC="$OPTARG";;
282         p) IF_PRIVATE=1;;
283         '?') ;;
284         *) cmd="$OPT"; iface="$OPTARG";;
285         esac
286 done
287 shift $(($OPTIND - 1))
288 args="$iface${iface:+ }$@"
289
290 # -I inits the state dir
291 if [ "$cmd" = I ]; then
292         if [ -d "$VARDIR" ]; then
293                 rm -rf "$VARDIR"/*
294         fi
295         exit $?
296 fi
297
298 # -l lists our resolv files, optionally for a specific interface
299 if [ "$cmd" = l -o "$cmd" = i ]; then
300         list_resolv "$cmd" "$args"
301         exit $?
302 fi
303
304 # Not normally needed, but subscribers should be able to run independently
305 if [ "$cmd" = v ]; then
306         make_vars "$iface"
307         exit $?
308 fi
309
310 # Test that we have valid options
311 if [ "$cmd" = a -o "$cmd" = d ]; then
312         if [ -z "$iface" ]; then
313                 usage "Interface not specified"
314         fi
315 elif [ "$cmd" != u ]; then
316         [ -n "$cmd" -a "$cmd" != h ] && usage "Unknown option $cmd"
317         usage
318 fi
319 if [ "$cmd" = a ]; then
320         for x in '/' \\ ' ' '*'; do
321                 case "$iface" in
322                 *[$x]*) error_exit "$x not allowed in interface name";;
323                 esac
324         done
325         for x in '.' '-' '~'; do
326                 case "$iface" in
327                 [$x]*) error_exit \
328                         "$x not allowed at start of interface name";;
329                 esac
330         done
331         [ "$cmd" = a -a -t 0 ] && error_exit "No file given via stdin"
332 fi
333
334 if [ ! -d "$IFACEDIR" ]; then
335         if [ ! -d "$VARDIR" ]; then
336                 if [ -L "$VARDIR" ]; then
337                         dir="$(readlink "$VARDIR")"
338                         # link maybe relative
339                         cd "${VARDIR%/*}"
340                         if ! mkdir -m 0755 -p "$dir"; then
341                                 error_exit "Failed to create needed" \
342                                         "directory $dir"
343                         fi
344                 else
345                         if ! mkdir -m 0755 -p "$VARDIR"; then
346                                 error_exit "Failed to create needed" \
347                                         "directory $VARDIR"
348                         fi
349                 fi
350         fi
351         mkdir -m 0755 -p "$IFACEDIR" || \
352                 error_exit "Failed to create needed directory $IFACEDIR"
353 else
354         # Delete any existing information about the interface
355         if [ "$cmd" = d ]; then
356                 cd "$IFACEDIR"
357                 for i in $args; do
358                         if [ "$cmd" = d -a ! -e "$i" ]; then
359                                 $force && continue
360                                 error_exit "No resolv.conf for" \
361                                         "interface $i"
362                         fi
363                         rm -f "$i" "$METRICDIR/"*" $i" \
364                                 "$PRIVATEDIR/$i" || exit $?
365                 done
366         fi
367 fi
368
369 if [ "$cmd" = a ]; then
370         # Read resolv.conf from stdin
371         resolv="$(cat)\n"
372         # If what we are given matches what we have, then do nothing
373         if [ -e "$IFACEDIR/$iface" ]; then
374                 if [ "$(printf "$resolv")" = \
375                         "$(cat "$IFACEDIR/$iface")" ]
376                 then
377                         exit 0
378                 fi
379                 rm "$IFACEDIR/$iface"
380         fi
381         printf "$resolv" >"$IFACEDIR/$iface" || exit $?
382         [ ! -d "$METRICDIR" ] && mkdir "$METRICDIR"
383         rm -f "$METRICDIR/"*" $iface"
384         if [ -n "$IF_METRIC" ]; then
385                 # Pad metric to 6 characters, so 5 is less than 10
386                 while [ ${#IF_METRIC} -le 6 ]; do
387                         IF_METRIC="0$IF_METRIC"
388                 done
389                 echo " " >"$METRICDIR/$IF_METRIC $iface"
390         fi
391         case "$IF_PRIVATE" in
392         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
393                 if [ ! -d "$PRIVATEDIR" ]; then
394                         [ -e "$PRIVATEDIR" ] && rm "$PRIVATEDIR"
395                         mkdir "$PRIVATEDIR"
396                 fi
397                 [ -d "$PRIVATEDIR" ] && echo " " >"$PRIVATEDIR/$iface"
398                 ;;
399         *)
400                 if [ -e "$PRIVATEDIR/$iface" ]; then
401                         rm -f "$PRIVATEDIR/$iface"
402                 fi
403                 ;;
404         esac
405 fi
406
407 eval "$(make_vars)"
408 export RESOLVCONF DOMAINS SEARCH NAMESERVERS
409 : ${list_resolv:=list_resolv -l}
410 retval=0
411 for script in "$LIBEXECDIR"/*; do
412         if [ -f "$script" ]; then
413                 if [ -x "$script" ]; then
414                         "$script" "$cmd" "$iface"
415                 else
416                         (. "$script" "$cmd" "$iface")
417                 fi
418                 retval=$(($retval + $?))
419         fi
420 done
421 exit $retval