roy.marples.name Git - openresolv/blob - 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/$1"
  96         echo
  97 }
  98
  99 # Parse resolv.conf's and make variables
 100 # for domain name servers, search name servers and global nameservers
 101 parse_resolv()
 102 {
 103         local line= ns= ds= search= d= n= newns=
 104         local new=true iface= private=false
 105
 106         echo "DOMAINS="
 107         echo "SEARCH="
 108         echo "NAMESERVERS="
 109
 110         while read line; do
 111                 case "$line" in
 112                 "# resolv.conf from "*)
 113                         if ${new}; then
 114                                 iface="${line#\# resolv.conf from *}"
 115                                 new=false
 116                                 case " $private_interfaces " in
 117                                 *" $iface "*)
 118                                         private=true
 119                                         ;;
 120                                 *)
 121                                         if [ -e "$PRIVATEDIR/$iface" ]; then
 122                                                 private=true
 123                                         else
 124                                                 private=false
 125                                         fi
 126                                         ;;
 127                                 esac
 128                         fi
 129                         ;;
 130                 "nameserver "*)
 131                         case "${line#* }" in
 132                         127.*|0.0.0.0|255.255.255.255) continue;;
 133                         esac
 134                         ns="$ns${line#* } "
 135                         ;;
 136                 "domain "*|"search "*)
 137                         search="${line#* }"
 138                         ;;
 139                 *)
 140                         [ -n "$line" ] && continue
 141                         if [ -n "$ns" -a -n "$search" ]; then
 142                                 newns=
 143                                 for n in $ns; do
 144                                         newns="$newns${newns:+,}$n"
 145                                 done
 146                                 ds=
 147                                 for d in $search; do
 148                                         ds="$ds${ds:+ }$d:$newns"
 149                                 done
 150                                 echo "DOMAINS=\"\$DOMAINS $ds\""
 151                         fi
 152                         echo "SEARCH=\"\$SEARCH $search\""
 153                         if ! $private; then
 154                                 echo "NAMESERVERS=\"\$NAMESERVERS $ns\""
 155                         fi
 156                         ns=
 157                         search=
 158                         new=true
 159                         ;;
 160                 esac
 161         done
 162 }
 163
 164 uniqify()
 165 {
 166         local result=
 167         while [ -n "$1" ]; do
 168                 case " $result " in
 169                 *" $1 "*);;
 170                 *) result="$result $1";;
 171                 esac
 172                 shift
 173         done
 174         echo "${result# *}"
 175 }
 176
 177 list_resolv()
 178 {
 179         [ -d "$IFACEDIR" ] || return 0
 180
 181         local report=false list= retval=0 cmd="$1"
 182         shift
 183
 184         # If we have an interface ordering list, then use that.
 185         # It works by just using pathname expansion in the interface directory.
 186         if [ -n "$1" ]; then
 187                 list="$@"
 188                 $force || report=true
 189         else
 190                 cd "$IFACEDIR"
 191                 for i in $interface_order; do
 192                         [ -e "$i" ] && list="$list $i"
 193                 done
 194                 for i in $dynamic_order; do
 195                         if [ -e "$i" -a ! -e "$METRICDIR/"*" $i" ]; then
 196                                 list="$list $i"
 197                         fi
 198                 done
 199                 if [ -d "$METRICDIR" ]; then
 200                         cd "$METRICDIR"
 201                         for i in *; do
 202                                 list="$list ${i#* }"
 203                         done
 204                 fi
 205                 list="$list *"
 206         fi
 207
 208         cd "$IFACEDIR"
 209         for i in $(uniqify $list); do
 210                 # Only list interfaces which we really have
 211                 if ! [ -e "$i" ]; then
 212                         if $report; then
 213                                 echo "No resolv.conf for interface $i" >&2
 214                                 retval=$(($retval + 1))
 215                         fi
 216                         continue
 217                 fi
 218
 219                 if [ "$cmd" = i -o "$cmd" = "-i" ]; then
 220                         printf "$i "
 221                 else
 222                         echo_resolv "$i"
 223                 fi
 224         done
 225         [ "$cmd" = i -o "$cmd" = "-i" ] && echo
 226         return $retval
 227 }
 228
 229 make_vars()
 230 {
 231         eval "$(list_resolv -l "$@" | parse_resolv)"
 232
 233         # Ensure that we only list each domain once
 234         newdomains=
 235         for d in $DOMAINS; do
 236                 dn="${d%%:*}"
 237                 case " $newdomains" in
 238                 *" ${dn}:"*) continue;;
 239                 esac
 240                 newdomains="$newdomains${newdomains:+ }$dn:"
 241                 newns=
 242                 for nd in $DOMAINS; do
 243                         if [ "$dn" = "${nd%%:*}" ]; then
 244                                 ns="${nd#*:}"
 245                                 while [ -n "$ns" ]; do
 246                                         case ",$newns," in
 247                                         *,${ns%%,*},*) ;;
 248                                         *) newns="$newns${newns:+,}${ns%%,*}";;
 249                                         esac
 250                                         [ "$ns" = "${ns#*,}" ] && break
 251                                         ns="${ns#*,}"
 252                                 done
 253                         fi
 254                 done
 255                 newdomains="$newdomains$newns"
 256         done
 257         echo "DOMAINS='$newdomains'"
 258         echo "SEARCH='$(uniqify $SEARCH)'"
 259         echo "NAMESERVERS='$(uniqify $NAMESERVERS)'"
 260 }
 261
 262 force=false
 263 while getopts a:d:fhilm:puv OPT; do
 264         case "$OPT" in
 265         f) force=true;;
 266         h) usage;;
 267         m) IF_METRIC="$OPTARG";;
 268         p) IF_PRIVATE=1;;
 269         '?') ;;
 270         *) cmd="$OPT"; iface="$OPTARG";;
 271         esac
 272 done
 273 shift $(($OPTIND - 1))
 274 args="$iface${iface:+ }$@"
 275
 276 # -I inits the state dir
 277 if [ "$cmd" = I ]; then
 278         if [ -d "$VARDIR" ]; then
 279                 rm -rf "$VARDIR"/*
 280         fi
 281         exit $?
 282 fi
 283
 284 # -l lists our resolv files, optionally for a specific interface
 285 if [ "$cmd" = l -o "$cmd" = i ]; then
 286         list_resolv "$cmd" "$args"
 287         exit $?
 288 fi
 289
 290 # Not normally needed, but subscribers should be able to run independently
 291 if [ "$cmd" = v ]; then
 292         make_vars "$iface"
 293         exit $?
 294 fi
 295
 296 # Test that we have valid options
 297 if [ "$cmd" = a -o "$cmd" = d ]; then
 298         if [ -z "$iface" ]; then
 299                 usage "Interface not specified"
 300         fi
 301 elif [ "$cmd" != u ]; then
 302         [ -n "$cmd" -a "$cmd" != h ] && usage "Unknown option $cmd"
 303         usage
 304 fi
 305 if [ "$cmd" = a ]; then
 306         for x in '/' \\ ' ' '*'; do
 307                 case "$iface" in
 308                 *[$x]*) error_exit "$x not allowed in interface name";;
 309                 esac
 310         done
 311         for x in '.' '-' '~'; do
 312                 case "$iface" in
 313                 [$x]*) error_exit \
 314                         "$x not allowed at start of interface name";;
 315                 esac
 316         done
 317         [ "$cmd" = a -a -t 0 ] && error_exit "No file given via stdin"
 318 fi
 319
 320 if [ ! -d "$IFACEDIR" ]; then
 321         if [ ! -d "$VARDIR" ]; then
 322                 if [ -L "$VARDIR" ]; then
 323                         dir="$(readlink "$VARDIR")"
 324                         # link maybe relative
 325                         cd "${VARDIR%/*}"
 326                         if ! mkdir -m 0755 -p "$dir"; then
 327                                 error_exit "Failed to create needed" \
 328                                         "directory $dir"
 329                         fi
 330                 else
 331                         if ! mkdir -m 0755 -p "$VARDIR"; then
 332                                 error_exit "Failed to create needed" \
 333                                         "directory $VARDIR"
 334                         fi
 335                 fi
 336         fi
 337         mkdir -m 0755 -p "$IFACEDIR" || \
 338                 error_exit "Failed to create needed directory $IFACEDIR"
 339 else
 340         # Delete any existing information about the interface
 341         if [ "$cmd" = d ]; then
 342                 cd "$IFACEDIR"
 343                 for i in $args; do
 344                         if [ "$cmd" = d -a ! -e "$i" ]; then
 345                                 $force && continue
 346                                 error_exit "No resolv.conf for" \
 347                                         "interface $i"
 348                         fi
 349                         rm -f "$i" "$METRICDIR/"*" $i" \
 350                                 "$PRIVATEDIR/$i" || exit $?
 351                 done
 352         fi
 353 fi
 354
 355 if [ "$cmd" = a ]; then
 356         # Read resolv.conf from stdin
 357         resolv="$(cat)\n"
 358         # If what we are given matches what we have, then do nothing
 359         if [ -e "$IFACEDIR/$iface" ]; then
 360                 if [ "$(printf "$resolv")" = \
 361                         "$(cat "$IFACEDIR/$iface")" ]
 362                 then
 363                         exit 0
 364                 fi
 365                 rm "$IFACEDIR/$iface"
 366         fi
 367         printf "$resolv" >"$IFACEDIR/$iface" || exit $?
 368         [ ! -d "$METRICDIR" ] && mkdir "$METRICDIR"
 369         rm -f "$METRICDIR/"*" $iface"
 370         if [ -n "$IF_METRIC" ]; then
 371                 # Pad metric to 6 characters, so 5 is less than 10
 372                 while [ ${#IF_METRIC} -le 6 ]; do
 373                         IF_METRIC="0$IF_METRIC"
 374                 done
 375                 echo " " >"$METRICDIR/$IF_METRIC $iface"
 376         fi
 377         case "$IF_PRIVATE" in
 378         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 379                 if [ ! -d "$PRIVATEDIR" ]; then
 380                         [ -e "$PRIVATEDIR" ] && rm "$PRIVATEDIR"
 381                         mkdir "$PRIVATEDIR"
 382                 fi
 383                 [ -d "$PRIVATEDIR" ] && echo " " >"$PRIVATEDIR/$iface"
 384                 ;;
 385         *)
 386                 if [ -e "$PRIVATEDIR/$iface" ]; then
 387                         rm -f "$PRIVATEDIR/$iface"
 388                 fi
 389                 ;;
 390         esac
 391 fi
 392
 393 eval "$(make_vars)"
 394 : ${list_resolv:=list_resolv -l}
 395 retval=0
 396 for script in "$LIBEXECDIR"/*; do
 397         if [ -f "$script" ]; then
 398                 if [ -x "$script" ]; then
 399                         "$script" "$cmd" "$iface"
 400                 else
 401                         (. "$script" "$cmd" "$fiace")
 402                 fi
 403                 retval=$(($retval + $?))
 404         fi
 405     done
 406 exit $retval