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