contrib/openresolv/resolvconf.in

   1 #!/bin/sh
   2 # Copyright (c) 2007-2015 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="$0"
  28 SYSCONFDIR=@SYSCONFDIR@
  29 LIBEXECDIR=@LIBEXECDIR@
  30 VARDIR=@VARDIR@
  31
  32 # Disregard dhcpcd setting
  33 unset interface_order state_dir
  34
  35 # If you change this, change the test in VFLAG and libc.in as well
  36 local_nameservers="127.* 0.0.0.0 255.255.255.255 ::1"
  37
  38 dynamic_order="tap[0-9]* tun[0-9]* vpn vpn[0-9]* ppp[0-9]* ippp[0-9]*"
  39 interface_order="lo lo[0-9]*"
  40 name_server_blacklist="0.0.0.0"
  41
  42 # Support original resolvconf configuration layout
  43 # as well as the openresolv config file
  44 if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then
  45         . "$SYSCONFDIR"/resolvconf.conf
  46         [ -n "$state_dir" ] && VARDIR="$state_dir"
  47 elif [ -d "$SYSCONFDIR/resolvconf" ]; then
  48         SYSCONFDIR="$SYSCONFDIR/resolvconf"
  49         if [ -f "$SYSCONFDIR"/interface-order ]; then
  50                 interface_order="$(cat "$SYSCONFDIR"/interface-order)"
  51         fi
  52 fi
  53 TMPDIR="$VARDIR/tmp"
  54 IFACEDIR="$VARDIR/interfaces"
  55 METRICDIR="$VARDIR/metrics"
  56 PRIVATEDIR="$VARDIR/private"
  57 EXCLUSIVEDIR="$VARDIR/exclusive"
  58 LOCKDIR="$VARDIR/lock"
  59
  60 warn()
  61 {
  62         echo "$*" >&2
  63 }
  64
  65 error_exit()
  66 {
  67         echo "$*" >&2
  68         exit 1
  69 }
  70
  71 usage()
  72 {
  73         cat <<-EOF
  74         Usage: ${RESOLVCONF##*/} [options]
  75
  76         Inform the system about any DNS updates.
  77
  78         Options:
  79           -a \$INTERFACE    Add DNS information to the specified interface
  80                            (DNS supplied via stdin in resolv.conf format)
  81           -m metric        Give the added DNS information a metric
  82           -p               Mark the interface as private
  83           -x               Mark the interface as exclusive
  84           -d \$INTERFACE    Delete DNS information from the specified interface
  85           -f               Ignore non existant interfaces
  86           -I               Init the state dir
  87           -u               Run updates from our current DNS information
  88           -l [\$PATTERN]    Show DNS information, optionally from interfaces
  89                            that match the specified pattern
  90           -i [\$PATTERN]    Show interfaces that have supplied DNS information
  91                    optionally from interfaces that match the specified
  92                    pattern
  93           -v [\$PATTERN]    echo NEWDOMAIN, NEWSEARCH and NEWNS variables to
  94                            the console
  95           -h               Show this help cruft
  96         EOF
  97         [ -z "$1" ] && exit 0
  98         echo
  99         error_exit "$*"
 100 }
 101
 102 echo_resolv()
 103 {
 104         local line= OIFS="$IFS"
 105
 106         [ -n "$1" -a -f "$IFACEDIR/$1" ] || return 1
 107         echo "# resolv.conf from $1"
 108         # Our variable maker works of the fact each resolv.conf per interface
 109         # is separated by blank lines.
 110         # So we remove them when echoing them.
 111         while read -r line; do
 112                 IFS="$OIFS"
 113                 if [ -n "$line" ]; then
 114                         # We need to set IFS here to preserve any whitespace
 115                         IFS=''
 116                         printf "%s\n" "$line"
 117                 fi
 118         done < "$IFACEDIR/$1"
 119         echo
 120         IFS="$OIFS"
 121 }
 122
 123 # Parse resolv.conf's and make variables
 124 # for domain name servers, search name servers and global nameservers
 125 parse_resolv()
 126 {
 127         local line= ns= ds= search= d= n= newns=
 128         local new=true iface= private=false p= domain= l= islocal=
 129
 130         newns=
 131
 132         while read -r line; do
 133                 case "$line" in
 134                 "# resolv.conf from "*)
 135                         if ${new}; then
 136                                 iface="${line#\# resolv.conf from *}"
 137                                 new=false
 138                                 if [ -e "$PRIVATEDIR/$iface" ]; then
 139                                         private=true
 140                                 else
 141                                         # Allow expansion
 142                                         cd "$IFACEDIR"
 143                                         private=false
 144                                         for p in $private_interfaces; do
 145                                                 case "$iface" in
 146                                                 "$p"|"$p":*) private=true; break;;
 147                                                 esac
 148                                         done
 149                                 fi
 150                         fi
 151                         ;;
 152                 "nameserver "*)
 153                         islocal=false
 154                         for l in $local_nameservers; do
 155                                 case "${line#* }" in
 156                                 $l)
 157                                         islocal=true
 158                                         echo "LOCALNAMESERVERS=\"\$LOCALNAMESERVERS ${line#* }\""
 159                                         break
 160                                         ;;
 161                                 esac
 162                         done
 163                         $islocal || ns="$ns${line#* } "
 164                         ;;
 165                 "domain "*)
 166                         if [ -z "$domain" ]; then
 167                                 domain="${line#* }"
 168                                 echo "DOMAIN=\"$domain\""
 169                         fi
 170                         search="${line#* }"
 171                         ;;
 172                 "search "*)
 173                         search="${line#* }"
 174                         ;;
 175                 *)
 176                         [ -n "$line" ] && continue
 177                         if [ -n "$ns" -a -n "$search" ]; then
 178                                 newns=
 179                                 for n in $ns; do
 180                                         newns="$newns${newns:+,}$n"
 181                                 done
 182                                 ds=
 183                                 for d in $search; do
 184                                         ds="$ds${ds:+ }$d:$newns"
 185                                 done
 186                                 echo "DOMAINS=\"\$DOMAINS $ds\""
 187                         fi
 188                         echo "SEARCH=\"\$SEARCH $search\""
 189                         if ! $private; then
 190                                 echo "NAMESERVERS=\"\$NAMESERVERS $ns\""
 191                         fi
 192                         ns=
 193                         search=
 194                         new=true
 195                         ;;
 196                 esac
 197         done
 198 }
 199
 200 uniqify()
 201 {
 202         local result=
 203         while [ -n "$1" ]; do
 204                 case " $result " in
 205                 *" $1 "*);;
 206                 *) result="$result $1";;
 207                 esac
 208                 shift
 209         done
 210         echo "${result# *}"
 211 }
 212
 213 dirname()
 214 {
 215         local dir= OIFS="$IFS"
 216         local IFS=/
 217         set -- $@
 218         IFS="$OIFS"
 219         if [ -n "$1" ]; then
 220                 printf %s .
 221         else
 222                 shift
 223         fi
 224         while [ -n "$2" ]; do
 225                 printf "/%s" "$1"
 226                 shift
 227         done
 228         printf "\n"
 229 }
 230
 231 config_mkdirs()
 232 {
 233         local e=0 f d
 234         for f; do
 235                 [ -n "$f" ] || continue
 236                 d="$(dirname "$f")"
 237                 if [ ! -d "$d" ]; then
 238                         if type install >/dev/null 2>&1; then
 239                                 install -d "$d" || e=$?
 240                         else
 241                                 mkdir "$d" || e=$?
 242                         fi
 243                 fi
 244         done
 245         return $e
 246 }
 247
 248 list_resolv()
 249 {
 250         [ -d "$IFACEDIR" ] || return 0
 251
 252         local report=false list= retval=0 cmd="$1" excl=
 253         shift
 254
 255         case "$IF_EXCLUSIVE" in
 256         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 257                 if [ -d "$EXCLUSIVEDIR" ]; then
 258                         cd "$EXCLUSIVEDIR"
 259                         for i in *; do
 260                                 if [ -f "$i" ]; then
 261                                         list="${i#* }"
 262                                         break
 263                                 fi
 264                         done
 265                 fi
 266                 excl=true
 267                 ;;
 268         *)
 269                 excl=false
 270                 ;;
 271         esac
 272
 273         # If we have an interface ordering list, then use that.
 274         # It works by just using pathname expansion in the interface directory.
 275         if [ -n "$1" ]; then
 276                 list="$*"
 277                 $force || report=true
 278         elif ! $excl; then
 279                 cd "$IFACEDIR"
 280                 for i in $interface_order; do
 281                         [ -f "$i" ] && list="$list $i"
 282                         for ii in "$i":* "$i".*; do
 283                                 [ -f "$ii" ] && list="$list $ii"
 284                         done
 285                 done
 286                 for i in $dynamic_order; do
 287                         if [ -e "$i" -a ! -e "$METRICDIR/"*" $i" ]; then
 288                                 list="$list $i"
 289                         fi
 290                         for ii in "$i":* "$i".*; do
 291                                 if [ -f "$ii" -a ! -e "$METRICDIR/"*" $ii" ]; then
 292                                         list="$list $ii"
 293                                 fi
 294                         done
 295                 done
 296                 if [ -d "$METRICDIR" ]; then
 297                         cd "$METRICDIR"
 298                         for i in *; do
 299                                 [ -f "$i" ] && list="$list ${i#* }"
 300                         done
 301                 fi
 302                 list="$list *"
 303         fi
 304
 305         cd "$IFACEDIR"
 306         retval=1
 307         for i in $(uniqify $list); do
 308                 # Only list interfaces which we really have
 309                 if ! [ -f "$i" ]; then
 310                         if $report; then
 311                                 echo "No resolv.conf for interface $i" >&2
 312                                 retval=2
 313                         fi
 314                         continue
 315                 fi
 316
 317                 if [ "$cmd" = i -o "$cmd" = "-i" ]; then
 318                         printf %s "$i "
 319                 else
 320                         echo_resolv "$i"
 321                 fi
 322                 [ $? = 0 -a "$retval" = 1 ] && retval=0
 323         done
 324         [ "$cmd" = i -o "$cmd" = "-i" ] && echo
 325         return $retval
 326 }
 327
 328 list_remove() {
 329         local list= e= l= result= found= retval=0
 330
 331         [ -z "$2" ] && return 0
 332         eval list=\"\$$1\"
 333         shift
 334
 335         set -f
 336         for e; do
 337                 found=false
 338                 for l in $list; do
 339                         case "$e" in
 340                         $l) found=true;;
 341                         esac
 342                         $found && break
 343                 done
 344                 if $found; then
 345                         retval=$(($retval + 1))
 346                 else
 347                         result="$result $e"
 348                 fi
 349         done
 350         set +f
 351         echo "${result# *}"
 352         return $retval
 353 }
 354
 355 echo_prepend()
 356 {
 357         echo "# Generated by resolvconf"
 358         if [ -n "$search_domains" ]; then
 359                 echo "search $search_domains"
 360         fi
 361         for n in $name_servers; do
 362                 echo "nameserver $n"
 363         done
 364         echo
 365 }
 366
 367 echo_append()
 368 {
 369         echo "# Generated by resolvconf"
 370         if [ -n "$search_domains_append" ]; then
 371                 echo "search $search_domains_append"
 372         fi
 373         for n in $name_servers_append; do
 374                 echo "nameserver $n"
 375         done
 376         echo
 377 }
 378
 379 replace()
 380 {
 381         local r= k= f= v= val= sub=
 382
 383         while read -r keyword value; do
 384                 for r in $replace; do
 385                         k="${r%%/*}"
 386                         r="${r#*/}"
 387                         f="${r%%/*}"
 388                         r="${r#*/}"
 389                         v="${r%%/*}"
 390                         case "$keyword" in
 391                         $k)
 392                                 case "$value" in
 393                                 $f) value="$v";;
 394                                 esac
 395                                 ;;
 396                         esac
 397                 done
 398                 val=
 399                 for sub in $value; do
 400                         for r in $replace_sub; do
 401                                 k="${r%%/*}"
 402                                 r="${r#*/}"
 403                                 f="${r%%/*}"
 404                                 r="${r#*/}"
 405                                 v="${r%%/*}"
 406                                 case "$keyword" in
 407                                 $k)
 408                                         case "$sub" in
 409                                         $f) sub="$v";;
 410                                         esac
 411                                         ;;
 412                                 esac
 413                         done
 414                         val="$val${val:+ }$sub"
 415                 done
 416                 printf "%s %s\n" "$keyword" "$val"
 417         done
 418 }
 419
 420 make_vars()
 421 {
 422         local newdomains= d= dn= newns= ns=
 423
 424         # Clear variables
 425         DOMAIN=
 426         DOMAINS=
 427         SEARCH=
 428         NAMESERVERS=
 429         LOCALNAMESERVERS=
 430
 431         if [ -n "$name_servers" -o -n "$search_domains" ]; then
 432                 eval "$(echo_prepend | parse_resolv)"
 433         fi
 434         if [ -z "$VFLAG" ]; then
 435                 IF_EXCLUSIVE=1
 436                 list_resolv -i "$@" >/dev/null || IF_EXCLUSIVE=0
 437                 eval "$(list_resolv -l "$@" | replace | parse_resolv)"
 438         fi
 439         if [ -n "$name_servers_append" -o -n "$search_domains_append" ]; then
 440                 eval "$(echo_append | parse_resolv)"
 441         fi
 442
 443         # Ensure that we only list each domain once
 444         for d in $DOMAINS; do
 445                 dn="${d%%:*}"
 446                 list_remove domain_blacklist "$dn" >/dev/null || continue
 447                 case " $newdomains" in
 448                 *" ${dn}:"*) continue;;
 449                 esac
 450                 newns=
 451                 for nd in $DOMAINS; do
 452                         if [ "$dn" = "${nd%%:*}" ]; then
 453                                 ns="${nd#*:}"
 454                                 while [ -n "$ns" ]; do
 455                                         case ",$newns," in
 456                                         *,${ns%%,*},*) ;;
 457                                         *) list_remove name_server_blacklist \
 458                                                 "${ns%%,*}" >/dev/null \
 459                                         && newns="$newns${newns:+,}${ns%%,*}";;
 460                                         esac
 461                                         [ "$ns" = "${ns#*,}" ] && break
 462                                         ns="${ns#*,}"
 463                                 done
 464                         fi
 465                 done
 466                 if [ -n "$newns" ]; then
 467                         newdomains="$newdomains${newdomains:+ }$dn:$newns"
 468                 fi
 469         done
 470         DOMAIN="$(list_remove domain_blacklist $DOMAIN)"
 471         SEARCH="$(uniqify $SEARCH)"
 472         SEARCH="$(list_remove domain_blacklist $SEARCH)"
 473         NAMESERVERS="$(uniqify $NAMESERVERS)"
 474         NAMESERVERS="$(list_remove name_server_blacklist $NAMESERVERS)"
 475         LOCALNAMESERVERS="$(uniqify $LOCALNAMESERVERS)"
 476         LOCALNAMESERVERS="$(list_remove name_server_blacklist $LOCALNAMESERVERS)"
 477         echo "DOMAIN='$DOMAIN'"
 478         echo "SEARCH='$SEARCH'"
 479         echo "NAMESERVERS='$NAMESERVERS'"
 480         echo "LOCALNAMESERVERS='$LOCALNAMESERVERS'"
 481         echo "DOMAINS='$newdomains'"
 482 }
 483
 484 force=false
 485 VFLAG=
 486 while getopts a:Dd:fhIilm:puvVx OPT; do
 487         case "$OPT" in
 488         f) force=true;;
 489         h) usage;;
 490         m) IF_METRIC="$OPTARG";;
 491         p) IF_PRIVATE=1;;
 492         V)
 493                 VFLAG=1
 494                 if [ "$local_nameservers" = \
 495                     "127.* 0.0.0.0 255.255.255.255 ::1" ]
 496                 then
 497                         local_nameservers=
 498                 fi
 499                 ;;
 500         x) IF_EXCLUSIVE=1;;
 501         '?') ;;
 502         *) cmd="$OPT"; iface="$OPTARG";;
 503         esac
 504 done
 505 shift $(($OPTIND - 1))
 506 args="$iface${iface:+ }$*"
 507
 508 # -I inits the state dir
 509 if [ "$cmd" = I ]; then
 510         if [ -d "$VARDIR" ]; then
 511                 rm -rf "$VARDIR"/*
 512         fi
 513         exit $?
 514 fi
 515
 516 # -D ensures that the listed config file base dirs exist
 517 if [ "$cmd" = D ]; then
 518         config_mkdirs "$@"
 519         exit $?
 520 fi
 521
 522 # -l lists our resolv files, optionally for a specific interface
 523 if [ "$cmd" = l -o "$cmd" = i ]; then
 524         list_resolv "$cmd" "$args"
 525         exit $?
 526 fi
 527
 528 # Not normally needed, but subscribers should be able to run independently
 529 if [ "$cmd" = v -o -n "$VFLAG" ]; then
 530         make_vars "$iface"
 531         exit $?
 532 fi
 533
 534 # Test that we have valid options
 535 if [ "$cmd" = a -o "$cmd" = d ]; then
 536         if [ -z "$iface" ]; then
 537                 usage "Interface not specified"
 538         fi
 539 elif [ "$cmd" != u ]; then
 540         [ -n "$cmd" -a "$cmd" != h ] && usage "Unknown option $cmd"
 541         usage
 542 fi
 543
 544 if [ "$cmd" = a ]; then
 545         for x in '/' \\ ' ' '*'; do
 546                 case "$iface" in
 547                 *[$x]*) error_exit "$x not allowed in interface name";;
 548                 esac
 549         done
 550         for x in '.' '-' '~'; do
 551                 case "$iface" in
 552                 [$x]*) error_exit \
 553                         "$x not allowed at start of interface name";;
 554                 esac
 555         done
 556         [ "$cmd" = a -a -t 0 ] && error_exit "No file given via stdin"
 557 fi
 558
 559 if [ ! -d "$VARDIR" ]; then
 560         if [ -L "$VARDIR" ]; then
 561                 dir="$(readlink "$VARDIR")"
 562                 # link maybe relative
 563                 cd "${VARDIR%/*}"
 564                 if ! mkdir -m 0755 -p "$dir"; then
 565                         error_exit "Failed to create needed" \
 566                                 "directory $dir"
 567                 fi
 568         else
 569                 if ! mkdir -m 0755 -p "$VARDIR"; then
 570                         error_exit "Failed to create needed" \
 571                                 "directory $VARDIR"
 572                 fi
 573         fi
 574 fi
 575
 576 if [ ! -d "$IFACEDIR" ]; then
 577         mkdir -m 0755 -p "$IFACEDIR" || \
 578                 error_exit "Failed to create needed directory $IFACEDIR"
 579         if [ "$cmd" = d ]; then
 580                 # Provide the same error messages as below
 581                 if ! ${force}; then
 582                         cd "$IFACEDIR"
 583                         for i in $args; do
 584                                 warn "No resolv.conf for interface $i"
 585                         done
 586                 fi
 587                 ${force}
 588                 exit $?
 589         fi
 590 fi
 591
 592 # An interface was added, changed, deleted or a general update was called.
 593 # Due to exclusivity we need to ensure that this is an atomic operation.
 594 # Our subscribers *may* need this as well if the init system is sub par.
 595 # As such we spinlock at this point as best we can.
 596 # We don't use flock(1) because it's not widely available and normally resides
 597 # in /usr which we do our very best to operate without.
 598 [ -w "$VARDIR" ] || error_exit "Cannot write to $LOCKDIR"
 599 : ${lock_timeout:=10}
 600 while true; do
 601         if mkdir "$LOCKDIR" 2>/dev/null; then
 602                 trap 'rm -rf "$LOCKDIR";' EXIT
 603                 trap 'rm -rf "$LOCKDIR"; exit 1' INT QUIT ABRT SEGV ALRM TERM
 604                 echo $$ >"$LOCKDIR/pid"
 605                 break
 606         fi
 607         pid=$(cat "$LOCKDIR/pid")
 608         if ! kill -0 "$pid"; then
 609                 warn "clearing stale lock pid $pid"
 610                 rm -rf "$LOCKDIR"
 611                 continue
 612         fi
 613         lock_timeout=$(($lock_timeout - 1))
 614         if [ "$lock_timeout" -le 0 ]; then
 615                 error_exit "timed out waiting for lock from pid $pid"
 616         fi
 617         sleep 1
 618 done
 619
 620 case "$cmd" in
 621 a)
 622         # Read resolv.conf from stdin
 623         resolv="$(cat)"
 624         changed=false
 625         changedfile=false
 626         # If what we are given matches what we have, then do nothing
 627         if [ -e "$IFACEDIR/$iface" ]; then
 628                 if [ "$(echo "$resolv")" != \
 629                         "$(cat "$IFACEDIR/$iface")" ]
 630                 then
 631                         changed=true
 632                         changedfile=true
 633                 fi
 634         else
 635                 changed=true
 636                 changedfile=true
 637         fi
 638
 639         # Set metric and private before creating the interface resolv.conf file
 640         # to ensure that it will have the correct flags
 641         [ ! -d "$METRICDIR" ] && mkdir "$METRICDIR"
 642         oldmetric="$METRICDIR/"*" $iface"
 643         newmetric=
 644         if [ -n "$IF_METRIC" ]; then
 645                 # Pad metric to 6 characters, so 5 is less than 10
 646                 while [ ${#IF_METRIC} -le 6 ]; do
 647                         IF_METRIC="0$IF_METRIC"
 648                 done
 649                 newmetric="$METRICDIR/$IF_METRIC $iface"
 650         fi
 651         rm -f "$METRICDIR/"*" $iface"
 652         [ "$oldmetric" != "$newmetric" -a \
 653             "$oldmetric" != "$METRICDIR/* $iface" ] &&
 654                 changed=true
 655         [ -n "$newmetric" ] && echo " " >"$newmetric"
 656
 657         case "$IF_PRIVATE" in
 658         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 659                 if [ ! -d "$PRIVATEDIR" ]; then
 660                         [ -e "$PRIVATEDIR" ] && rm "$PRIVATEDIR"
 661                         mkdir "$PRIVATEDIR"
 662                 fi
 663                 [ -e "$PRIVATEDIR/$iface" ] || changed=true
 664                 [ -d "$PRIVATEDIR" ] && echo " " >"$PRIVATEDIR/$iface"
 665                 ;;
 666         *)
 667                 if [ -e "$PRIVATEDIR/$iface" ]; then
 668                         rm -f "$PRIVATEDIR/$iface"
 669                         changed=true
 670                 fi
 671                 ;;
 672         esac
 673
 674         oldexcl=
 675         for x in "$EXCLUSIVEDIR/"*" $iface"; do
 676                 if [ -f "$x" ]; then
 677                         oldexcl="$x"
 678                         break
 679                 fi
 680         done
 681         case "$IF_EXCLUSIVE" in
 682         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 683                 if [ ! -d "$EXCLUSIVEDIR" ]; then
 684                         [ -e "$EXCLUSIVEDIR" ] && rm "$EXCLUSIVEDIR"
 685                         mkdir "$EXCLUSIVEDIR"
 686                 fi
 687                 cd "$EXCLUSIVEDIR"
 688                 for x in *; do
 689                         [ -f "$x" ] && break
 690                 done
 691                 if [ "${x#* }" != "$iface" ]; then
 692                         if [ "$x" = "${x% *}" ]; then
 693                                 x=10000000
 694                         else
 695                                 x="${x% *}"
 696                         fi
 697                         if [ "$x" = "0000000" ]; then
 698                                 warn "exclusive underflow"
 699                         else
 700                                 x=$(($x - 1))
 701                         fi
 702                         if [ -d "$EXCLUSIVEDIR" ]; then
 703                                 echo " " >"$EXCLUSIVEDIR/$x $iface"
 704                         fi
 705                         changed=true
 706                 fi
 707                 ;;
 708         *)
 709                 if [ -f "$oldexcl" ]; then
 710                         rm -f "$oldexcl"
 711                         changed=true
 712                 fi
 713                 ;;
 714         esac
 715
 716         if $changedfile; then
 717                 printf "%s\n" "$resolv" >"$IFACEDIR/$iface" || exit $?
 718         elif ! $changed; then
 719                 exit 0
 720         fi
 721         unset changed changedfile oldmetric newmetric x oldexcl
 722         ;;
 723
 724 d)
 725         # Delete any existing information about the interface
 726         cd "$IFACEDIR"
 727         changed=false
 728         for i in $args; do
 729                 if [ -e "$i" ]; then
 730                         changed=true
 731                 elif ! ${force}; then
 732                         warn "No resolv.conf for interface $i"
 733                 fi
 734                 rm -f "$i" "$METRICDIR/"*" $i" \
 735                         "$PRIVATEDIR/$i" \
 736                         "$EXCLUSIVEDIR/"*" $i" || exit $?
 737         done
 738         if ! ${changed}; then
 739                 # Set the return code based on the forced flag
 740                 ${force}
 741                 exit $?
 742         fi
 743         unset changed i
 744         ;;
 745 esac
 746
 747 case "${resolvconf:-YES}" in
 748 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) ;;
 749 *) exit 0;;
 750 esac
 751
 752 eval "$(make_vars)"
 753 export RESOLVCONF DOMAINS SEARCH NAMESERVERS LOCALNAMESERVERS
 754 : ${list_resolv:=list_resolv -l}
 755 retval=0
 756 for script in "$LIBEXECDIR"/*; do
 757         if [ -f "$script" ]; then
 758                 eval script_enabled="\$${script##*/}"
 759                 case "${script_enabled:-YES}" in
 760                 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) ;;
 761                 *) continue;;
 762                 esac
 763                 if [ -x "$script" ]; then
 764                         "$script" "$cmd" "$iface"
 765                 else
 766                         (set -- "$cmd" "$iface"; . "$script")
 767                 fi
 768                 retval=$(($retval + $?))
 769         fi
 770 done
 771 exit $retval