contrib/openresolv/resolvconf.in

   1 #!/bin/sh
   2 # Copyright (c) 2007-2020 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 OPENRESOLV_VERSION="3.12.0"
  29 SYSCONFDIR=@SYSCONFDIR@
  30 LIBEXECDIR=@LIBEXECDIR@
  31 VARDIR=@VARDIR@
  32 RCDIR=@RCDIR@
  33 RESTARTCMD=@RESTARTCMD@
  34
  35 if [ "$1" = "--version" ]; then
  36         echo "openresolv $OPENRESOLV_VERSION"
  37         echo "Copyright (c) 2007-2020 Roy Marples"
  38         exit 0
  39 fi
  40
  41 # Disregard dhcpcd setting
  42 unset interface_order state_dir
  43
  44 # If you change this, change the test in VFLAG and libc.in as well
  45 local_nameservers="127.* 0.0.0.0 255.255.255.255 ::1"
  46
  47 dynamic_order="tap[0-9]* tun[0-9]* vpn vpn[0-9]* wg[0-9]* ppp[0-9]* ippp[0-9]*"
  48 interface_order="lo lo[0-9]*"
  49 name_server_blacklist="0.0.0.0"
  50
  51 # Support original resolvconf configuration layout
  52 # as well as the openresolv config file
  53 if [ -f "$SYSCONFDIR"/resolvconf.conf ]; then
  54         . "$SYSCONFDIR"/resolvconf.conf
  55         [ -n "$state_dir" ] && VARDIR="$state_dir"
  56 elif [ -d "$SYSCONFDIR/resolvconf" ]; then
  57         SYSCONFDIR="$SYSCONFDIR/resolvconf"
  58         if [ -f "$SYSCONFDIR"/interface-order ]; then
  59                 interface_order="$(cat "$SYSCONFDIR"/interface-order)"
  60         fi
  61 fi
  62
  63 IFACEDIR="$VARDIR/interfaces"
  64 METRICDIR="$VARDIR/metrics"
  65 PRIVATEDIR="$VARDIR/private"
  66 EXCLUSIVEDIR="$VARDIR/exclusive"
  67 DEPRECATEDDIR="$VARDIR/deprecated"
  68 LOCKDIR="$VARDIR/lock"
  69 _PWD="$PWD"
  70
  71 warn()
  72 {
  73         echo "$*" >&2
  74 }
  75
  76 error_exit()
  77 {
  78         echo "$*" >&2
  79         exit 1
  80 }
  81
  82 usage()
  83 {
  84         cat <<-EOF
  85         Usage: ${RESOLVCONF##*/} [options] command [argument]
  86
  87         Inform the system about any DNS updates.
  88
  89         Commands:
  90           -a \$INTERFACE    Add DNS information to the specified interface
  91                            (DNS supplied via stdin in resolv.conf format)
  92           -C \$PATTERN      Deprecate DNS information for matched interfaces
  93           -c \$PATTERN      Configure DNS information for matched interfaces
  94           -d \$INTERFACE    Delete DNS information from the specified interface
  95           -h               Show this help cruft
  96           -i [\$PATTERN]    Show interfaces that have supplied DNS information
  97                    optionally from interfaces that match the specified
  98                    pattern
  99           -l [\$PATTERN]    Show DNS information, optionally from interfaces
 100                            that match the specified pattern
 101
 102           -u               Run updates from our current DNS information
 103           --version        Echo the ${RESOLVCONF##*/} version
 104
 105         Options:
 106           -f               Ignore non existent interfaces
 107           -m metric        Give the added DNS information a metric
 108           -p               Mark the interface as private
 109           -x               Mark the interface as exclusive
 110
 111         Subscriber and System Init Commands:
 112           -I               Init the state dir
 113           -r \$SERVICE      Restart the system service
 114                            (restarting a non-existent or non-running service
 115                             should have no output and return 0)
 116           -R               Show the system service restart command
 117           -v [\$PATTERN]    echo NEWDOMAIN, NEWSEARCH and NEWNS variables to
 118                            the console
 119           -V [\$PATTERN]    Same as -v, but only uses configuration in
 120                            $SYSCONFDIR/resolvconf.conf
 121         EOF
 122         [ -z "$1" ] && exit 0
 123         echo
 124         error_exit "$*"
 125 }
 126
 127 # Strip any trailing dot from each name as a FQDN does not belong
 128 # in resolv.conf(5)
 129 # If you think otherwise, capture a DNS trace and you'll see libc
 130 # will strip it regardless.
 131 # This also solves setting up duplicate zones in our subscribers.
 132 # Also strip any comments denoted by #.
 133 resolv_strip()
 134 {
 135         space=
 136         for word; do
 137                 case "$word" in
 138                 \#*) break;;
 139                 esac
 140                 printf "%s%s" "$space${word%.}"
 141                 space=" "
 142         done
 143         printf "\n"
 144 }
 145
 146 private_iface()
 147 {
 148         # Allow expansion
 149         cd "$IFACEDIR"
 150
 151         # Public interfaces override private ones.
 152         for p in $public_interfaces; do
 153                 case "$iface" in
 154                 "$p"|"$p":*) return 1;;
 155                 esac
 156         done
 157
 158         if [ -e "$PRIVATEDIR/$iface" ]; then
 159                 return 0
 160         fi
 161
 162         for p in $private_interfaces; do
 163                 case "$iface" in
 164                 "$p"|"$p":*) return 0;;
 165                 esac
 166         done
 167
 168         # Not a private interface
 169         return 1
 170 }
 171
 172 # Parse resolv.conf's and make variables
 173 # for domain name servers, search name servers and global nameservers
 174 parse_resolv()
 175 {
 176         domain=
 177         new=true
 178         newns=
 179         ns=
 180         private=false
 181         search=
 182
 183         while read -r line; do
 184                 stripped_line="$(resolv_strip ${line#* })"
 185                 case "$line" in
 186                 "# resolv.conf from "*)
 187                         if ${new}; then
 188                                 iface="${line#\# resolv.conf from *}"
 189                                 new=false
 190                                 if private_iface "$iface"; then
 191                                         private=true
 192                                 else
 193                                         private=false
 194                                 fi
 195                         fi
 196                         ;;
 197                 "nameserver "*)
 198                         islocal=false
 199                         for l in $local_nameservers; do
 200                                 case "$stripped_line" in
 201                                 $l)
 202                                         islocal=true
 203                                         break
 204                                         ;;
 205                                 esac
 206                         done
 207                         if $islocal; then
 208                                 echo "LOCALNAMESERVERS=\"\$LOCALNAMESERVERS $stripped_line\""
 209                         else
 210                                 ns="$ns$stripped_line "
 211                         fi
 212                         ;;
 213                 "domain "*)
 214                         search="$stripped_line"
 215                         if [ -z "$domain" ]; then
 216                                 domain="$search"
 217                                 echo "DOMAIN=\"$domain\""
 218                         fi
 219                         ;;
 220                 "search "*)
 221                         search="$stripped_line"
 222                         ;;
 223                 *)
 224                         [ -n "$line" ] && continue
 225                         if [ -n "$ns" ] && [ -n "$search" ]; then
 226                                 newns=
 227                                 for n in $ns; do
 228                                         newns="$newns${newns:+,}$n"
 229                                 done
 230                                 ds=
 231                                 for d in $search; do
 232                                         ds="$ds${ds:+ }$d:$newns"
 233                                 done
 234                                 echo "DOMAINS=\"\$DOMAINS $ds\""
 235                         fi
 236                         echo "SEARCH=\"\$SEARCH $search\""
 237                         if ! $private; then
 238                                 echo "NAMESERVERS=\"\$NAMESERVERS $ns\""
 239                         fi
 240                         ns=
 241                         search=
 242                         new=true
 243                         ;;
 244                 esac
 245         done
 246 }
 247
 248 uniqify()
 249 {
 250         result=
 251         while [ -n "$1" ]; do
 252                 case " $result " in
 253                 *" $1 "*);;
 254                 *) result="$result $1";;
 255                 esac
 256                 shift
 257         done
 258         echo "${result# *}"
 259 }
 260
 261 dirname()
 262 {
 263         OIFS="$IFS"
 264         IFS=/
 265         set -- $@
 266         IFS="$OIFS"
 267         if [ -n "$1" ]; then
 268                 printf %s .
 269         else
 270                 shift
 271         fi
 272         while [ -n "$2" ]; do
 273                 printf "/%s" "$1"
 274                 shift
 275         done
 276         printf "\n"
 277 }
 278
 279 config_mkdirs()
 280 {
 281         for f; do
 282                 [ -n "$f" ] || continue
 283                 d="$(dirname "$f")"
 284                 if [ ! -d "$d" ]; then
 285                         mkdir -p "$d" || return $?
 286                 fi
 287         done
 288         return 0
 289 }
 290
 291 # With the advent of alternative init systems, it's possible to have
 292 # more than one installed. So we need to try and guess what one we're
 293 # using unless overriden by configure.
 294 # Note that restarting a service is a last resort - the subscribers
 295 # should make a reasonable attempt to reconfigre the service via some
 296 # method, normally SIGHUP.
 297 detect_init()
 298 {
 299         [ -n "$RESTARTCMD" ] && return 0
 300
 301         # Detect the running init system.
 302         # As systemd and OpenRC can be installed on top of legacy init
 303         # systems we try to detect them first.
 304         status="@STATUSARG@"
 305         : ${status:=status}
 306         if [ -x /bin/systemctl ] && [ -S /run/systemd/private ]; then
 307                 RESTARTCMD='
 308                         if /bin/systemctl --quiet is-active $1.service
 309                         then
 310                                 /bin/systemctl restart $1.service
 311                         fi'
 312         elif [ -x /usr/bin/systemctl ] && [ -S /run/systemd/private ]; then
 313                 RESTARTCMD='
 314                         if /usr/bin/systemctl --quiet is-active $1.service
 315                         then
 316                                 /usr/bin/systemctl restart $1.service
 317                         fi'
 318         elif [ -x /sbin/rc-service ] &&
 319              { [ -s /libexec/rc/init.d/softlevel ] ||
 320              [ -s /run/openrc/softlevel ]; }
 321         then
 322                 RESTARTCMD='/sbin/rc-service -i $1 -- -Ds restart'
 323         elif [ -x /usr/sbin/invoke-rc.d ]; then
 324                 RCDIR=/etc/init.d
 325                 RESTARTCMD='
 326                    if /usr/sbin/invoke-rc.d --quiet $1 status >/dev/null 2>&1
 327                    then
 328                         /usr/sbin/invoke-rc.d $1 restart
 329                    fi'
 330         elif [ -x /sbin/service ]; then
 331                 # Old RedHat
 332                 RCDIR=/etc/init.d
 333                 RESTARTCMD='
 334                         if /sbin/service $1; then
 335                                 /sbin/service $1 restart
 336                         fi'
 337         elif [ -x /usr/sbin/service ]; then
 338                 # Could be FreeBSD
 339                 RESTARTCMD="
 340                         if /usr/sbin/service \$1 $status >/dev/null 2>&1
 341                         then
 342                                 /usr/sbin/service \$1 restart
 343                         fi"
 344         elif [ -x /bin/sv ]; then
 345                 RESTARTCMD='/bin/sv status $1 >/dev/null 2>&1 &&
 346                             /bin/sv try-restart $1'
 347         elif [ -x /usr/bin/sv ]; then
 348                 RESTARTCMD='/usr/bin/sv status $1 >/dev/null 2>&1 &&
 349                             /usr/bin/sv try-restart $1'
 350         elif [ -e /etc/arch-release ] && [ -d /etc/rc.d ]; then
 351                 RCDIR=/etc/rc.d
 352                 RESTARTCMD='
 353                         if [ -e /var/run/daemons/$1 ]
 354                         then
 355                                 /etc/rc.d/$1 restart
 356                         fi'
 357         elif [ -e /etc/slackware-version ] && [ -d /etc/rc.d ]; then
 358                 RESTARTCMD='
 359                         if /etc/rc.d/rc.$1 status >/dev/null 2>&1
 360                         then
 361                                 /etc/rc.d/rc.$1 restart
 362                         fi'
 363         elif [ -e /etc/rc.d/rc.subr ] && [ -d /etc/rc.d ]; then
 364                 # OpenBSD
 365                 RESTARTCMD='
 366                         if /etc/rc.d/$1 check >/dev/null 2>&1
 367                         then
 368                                 /etc/rc.d/$1 restart
 369                         fi'
 370         else
 371                 for x in /etc/init.d/rc.d /etc/rc.d /etc/init.d; do
 372                         [ -d $x ] || continue
 373                         RESTARTCMD="
 374                                 if $x/\$1 $status >/dev/null 2>&1
 375                                 then
 376                                         $x/\$1 restart
 377                                 fi"
 378                         break
 379                 done
 380         fi
 381
 382         if [ -z "$RESTARTCMD" ]; then
 383                 if [ "$_NOINIT_WARNED" != true ]; then
 384                         warn "could not detect a useable init system"
 385                         _NOINIT_WARNED=true
 386                 fi
 387                 return 1
 388         fi
 389         _NOINIT_WARNED=
 390         return 0
 391 }
 392
 393 echo_resolv()
 394 {
 395         OIFS="$IFS"
 396
 397         [ -n "$1" ] && [ -f "$IFACEDIR/$1" ] || return 1
 398         echo "# resolv.conf from $1"
 399         # Our variable maker works of the fact each resolv.conf per interface
 400         # is separated by blank lines.
 401         # So we remove them when echoing them.
 402         while read -r line; do
 403                 IFS="$OIFS"
 404                 if [ -n "$line" ]; then
 405                         # We need to set IFS here to preserve any whitespace
 406                         IFS=''
 407                         printf "%s\n" "$line"
 408                 fi
 409         done < "$IFACEDIR/$1"
 410         IFS="$OIFS"
 411 }
 412
 413 deprecated_interface()
 414 {
 415         [ -d "$DEPRECATEDDIR" ] || return 1
 416
 417         cd "$DEPRECATEDDIR"
 418         for da; do
 419                 for daf in *; do
 420                         [ -f "$daf" ] || continue
 421                         case "$da" in
 422                         $daf) return 0;;
 423                         esac
 424                 done
 425         done
 426         return 1
 427 }
 428
 429 list_resolv()
 430 {
 431         [ -d "$IFACEDIR" ] || return 0
 432
 433         cmd="$1"
 434         shift
 435         excl=false
 436         list=
 437         report=false
 438         retval=0
 439
 440         case "$IF_EXCLUSIVE" in
 441         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 442                 excl=true
 443                 if [ -d "$EXCLUSIVEDIR" ]; then
 444                         cd "$EXCLUSIVEDIR"
 445                         for i in *; do
 446                                 if [ -f "$i" ]; then
 447                                         list="${i#* }"
 448                                         break
 449                                 fi
 450                         done
 451                 fi
 452                 cd "$IFACEDIR"
 453                 for i in $inclusive_interfaces; do
 454                         if [ -f "$i" ] && [ "$list" = "$i" ]; then
 455                                 list=
 456                                 excl=false
 457                                 break
 458                         fi
 459                 done
 460                 ;;
 461         esac
 462
 463         # If we have an interface ordering list, then use that.
 464         # It works by just using pathname expansion in the interface directory.
 465         if [ -n "$1" ]; then
 466                 list="$*"
 467                 $force || report=true
 468         elif ! $excl; then
 469                 cd "$IFACEDIR"
 470
 471                 for i in $interface_order; do
 472                         [ -f "$i" ] && list="$list $i"
 473                         for ii in "$i":* "$i".*; do
 474                                 [ -f "$ii" ] && list="$list $ii"
 475                         done
 476                 done
 477
 478                 for i in $dynamic_order; do
 479                         if [ -e "$i" ] && ! [ -e "$METRICDIR/"*" $i" ]; then
 480                                 list="$list $i"
 481                         fi
 482                         for ii in "$i":* "$i".*; do
 483                                 if [ -f "$ii" ] && ! [ -e "$METRICDIR/"*" $ii" ]
 484                                 then
 485                                         list="$list $ii"
 486                                 fi
 487                         done
 488                 done
 489
 490                 # Interfaces have an implicit metric of 0 if not specified.
 491                 for i in *; do
 492                         if [ -f "$i" ] && ! [ -e "$METRICDIR/"*" $i" ]; then
 493                                 list="$list $i"
 494                         fi
 495                 done
 496
 497                 if [ -d "$METRICDIR" ]; then
 498                         cd "$METRICDIR"
 499                         for i in *; do
 500                                 [ -f "$i" ] && list="$list ${i#* }"
 501                         done
 502                 fi
 503
 504                 # Move deprecated interfaces to the back
 505                 active=
 506                 deprecated=
 507                 for i in $list; do
 508                         if deprecated_interface "$i"; then
 509                                 deprecated="$deprecated $i"
 510                         else
 511                                 active="$active $i"
 512                         fi
 513                 done
 514                 list="$active $deprecated"
 515         fi
 516
 517         cd "$IFACEDIR"
 518         retval=1
 519         for i in $(uniqify $list); do
 520                 # Only list interfaces which we really have
 521                 if ! [ -f "$i" ]; then
 522                         if $report; then
 523                                 echo "No resolv.conf for interface $i" >&2
 524                                 retval=2
 525                         fi
 526                         continue
 527                 fi
 528
 529                 if ! $ALLIFACES; then
 530                         if [ -n "$allow_interfaces" ]; then
 531                                 x=false
 532                                 for j in $allow_interfaces; do
 533                                         if [ "$i" = "$j" ]; then
 534                                                 x=true
 535                                         fi
 536                                 done
 537                                 $x || continue
 538                         fi
 539                         for j in $deny_interfaces; do
 540                                 if [ "$i" = "$j" ]; then
 541                                         continue 2
 542                                 fi
 543                         done
 544                 fi
 545
 546                 if [ "$cmd" = i ] || [ "$cmd" = "-i" ]; then
 547                         printf %s "$i "
 548                 else
 549                         echo_resolv "$i" && echo
 550                 fi
 551                 [ $? = 0 ] && [ "$retval" = 1 ] && retval=0
 552         done
 553         [ "$cmd" = i ] || [ "$cmd" = "-i" ] && echo
 554         return $retval
 555 }
 556
 557 list_remove()
 558 {
 559         [ -z "$2" ] && return 0
 560         eval list=\"\$$1\"
 561         shift
 562         result=
 563         retval=0
 564
 565         set -f
 566         for e; do
 567                 found=false
 568                 for l in $list; do
 569                         case "$e" in
 570                         $l) found=true;;
 571                         esac
 572                         $found && break
 573                 done
 574                 if $found; then
 575                         retval=$(($retval + 1))
 576                 else
 577                         result="$result $e"
 578                 fi
 579         done
 580         set +f
 581         echo "${result# *}"
 582         return $retval
 583 }
 584
 585 echo_prepend()
 586 {
 587         echo "# Generated by resolvconf"
 588         if [ -n "$search_domains" ]; then
 589                 echo "search $search_domains"
 590         fi
 591         for n in $name_servers; do
 592                 echo "nameserver $n"
 593         done
 594         echo
 595 }
 596
 597 echo_append()
 598 {
 599         echo "# Generated by resolvconf"
 600         if [ -n "$search_domains_append" ]; then
 601                 echo "search $search_domains_append"
 602         fi
 603         for n in $name_servers_append; do
 604                 echo "nameserver $n"
 605         done
 606         echo
 607 }
 608
 609 replace()
 610 {
 611         while read -r keyword value; do
 612                 for r in $replace; do
 613                         k="${r%%/*}"
 614                         r="${r#*/}"
 615                         f="${r%%/*}"
 616                         r="${r#*/}"
 617                         v="${r%%/*}"
 618                         case "$keyword" in
 619                         $k)
 620                                 case "$value" in
 621                                 $f) value="$v";;
 622                                 esac
 623                                 ;;
 624                         esac
 625                 done
 626                 val=
 627                 for sub in $value; do
 628                         for r in $replace_sub; do
 629                                 k="${r%%/*}"
 630                                 r="${r#*/}"
 631                                 f="${r%%/*}"
 632                                 r="${r#*/}"
 633                                 v="${r%%/*}"
 634                                 case "$keyword" in
 635                                 $k)
 636                                         case "$sub" in
 637                                         $f) sub="$v";;
 638                                         esac
 639                                         ;;
 640                                 esac
 641                         done
 642                         val="$val${val:+ }$sub"
 643                 done
 644                 printf "%s %s\n" "$keyword" "$val"
 645         done
 646 }
 647
 648 make_vars()
 649 {
 650         # Clear variables
 651         DOMAIN=
 652         DOMAINS=
 653         SEARCH=
 654         NAMESERVERS=
 655         LOCALNAMESERVERS=
 656
 657         if [ -n "${name_servers}${search_domains}" ]; then
 658                 eval "$(echo_prepend | parse_resolv)"
 659         fi
 660         if [ -z "$VFLAG" ]; then
 661                 IF_EXCLUSIVE=1
 662                 list_resolv -i "$@" >/dev/null || IF_EXCLUSIVE=0
 663                 eval "$(list_resolv -l "$@" | replace | parse_resolv)"
 664         fi
 665         if [ -n "${name_servers_append}${search_domains_append}" ]; then
 666                 eval "$(echo_append | parse_resolv)"
 667         fi
 668
 669         # Ensure that we only list each domain once
 670         newdomains=
 671         for d in $DOMAINS; do
 672                 dn="${d%%:*}"
 673                 list_remove domain_blacklist "$dn" >/dev/null || continue
 674                 case " $newdomains" in
 675                 *" ${dn}:"*) continue;;
 676                 esac
 677                 newns=
 678                 for nd in $DOMAINS; do
 679                         if [ "$dn" = "${nd%%:*}" ]; then
 680                                 ns="${nd#*:}"
 681                                 while [ -n "$ns" ]; do
 682                                         case ",$newns," in
 683                                         *,${ns%%,*},*) ;;
 684                                         *) list_remove name_server_blacklist \
 685                                                 "${ns%%,*}" >/dev/null \
 686                                         && newns="$newns${newns:+,}${ns%%,*}";;
 687                                         esac
 688                                         [ "$ns" = "${ns#*,}" ] && break
 689                                         ns="${ns#*,}"
 690                                 done
 691                         fi
 692                 done
 693                 if [ -n "$newns" ]; then
 694                         newdomains="$newdomains${newdomains:+ }$dn:$newns"
 695                 fi
 696         done
 697         DOMAIN="$(list_remove domain_blacklist $DOMAIN)"
 698         SEARCH="$(uniqify $SEARCH)"
 699         SEARCH="$(list_remove domain_blacklist $SEARCH)"
 700         NAMESERVERS="$(uniqify $NAMESERVERS)"
 701         NAMESERVERS="$(list_remove name_server_blacklist $NAMESERVERS)"
 702         LOCALNAMESERVERS="$(uniqify $LOCALNAMESERVERS)"
 703         LOCALNAMESERVERS="$(list_remove name_server_blacklist $LOCALNAMESERVERS)"
 704         echo "DOMAIN='$DOMAIN'"
 705         echo "SEARCH='$SEARCH'"
 706         echo "NAMESERVERS='$NAMESERVERS'"
 707         echo "LOCALNAMESERVERS='$LOCALNAMESERVERS'"
 708         echo "DOMAINS='$newdomains'"
 709 }
 710
 711 force=false
 712 VFLAG=
 713 while getopts a:C:c:Dd:fhIilm:pRruvVx OPT; do
 714         case "$OPT" in
 715         f) force=true;;
 716         h) usage;;
 717         m) IF_METRIC="$OPTARG";;
 718         p) IF_PRIVATE=1;;
 719         V)
 720                 VFLAG=1
 721                 if [ "$local_nameservers" = \
 722                     "127.* 0.0.0.0 255.255.255.255 ::1" ]
 723                 then
 724                         local_nameservers=
 725                 fi
 726                 ;;
 727         x) IF_EXCLUSIVE=1;;
 728         '?') exit 1;;
 729         *) cmd="$OPT"; iface="$OPTARG";;
 730         esac
 731 done
 732 shift $(($OPTIND - 1))
 733 args="$iface${iface:+ }$*"
 734
 735 # -I inits the state dir
 736 if [ "$cmd" = I ]; then
 737         if [ -d "$VARDIR" ]; then
 738                 rm -rf "$VARDIR"/*
 739         fi
 740         exit $?
 741 fi
 742
 743 # -D ensures that the listed config file base dirs exist
 744 if [ "$cmd" = D ]; then
 745         config_mkdirs "$@"
 746         exit $?
 747 fi
 748
 749 # -l lists our resolv files, optionally for a specific interface
 750 if [ "$cmd" = l ] || [ "$cmd" = i ]; then
 751         ALLIFACES=true
 752         list_resolv "$cmd" "$args"
 753         exit $?
 754 fi
 755 ALLIFACES=false
 756
 757 # Restart a service or echo the command to restart a service
 758 if [ "$cmd" = r ] || [ "$cmd" = R ]; then
 759         detect_init || exit 1
 760         if [ "$cmd" = r ]; then
 761                 set -- $args
 762                 eval "$RESTARTCMD"
 763         else
 764                 echo "$RESTARTCMD" |
 765                         sed -e '/^$/d' -e 's/^                  //g'
 766         fi
 767         exit $?
 768 fi
 769
 770 # Not normally needed, but subscribers should be able to run independently
 771 if [ "$cmd" = v ] || [ -n "$VFLAG" ]; then
 772         make_vars "$iface"
 773         exit $?
 774 fi
 775
 776 # Test that we have valid options
 777 case "$cmd" in
 778 a|d|C|c)
 779         if [ -z "$iface" ]; then
 780                 error_exit "Interface not specified"
 781         fi
 782         ;;
 783 u)      ;;
 784 *)
 785         if [ -n "$cmd" ] && [ "$cmd" != h ]; then
 786                 error_exit "Unknown option $cmd"
 787         fi
 788         usage
 789         ;;
 790 esac
 791
 792 if [ "$cmd" = a ]; then
 793         for x in '/' \\ ' ' '*'; do
 794                 case "$iface" in
 795                 *[$x]*) error_exit "$x not allowed in interface name";;
 796                 esac
 797         done
 798         for x in '.' '-' '~'; do
 799                 case "$iface" in
 800                 [$x]*) error_exit \
 801                         "$x not allowed at start of interface name";;
 802                 esac
 803         done
 804         [ "$cmd" = a ] && [ -t 0 ] && error_exit "No file given via stdin"
 805 fi
 806
 807 if [ ! -d "$VARDIR" ]; then
 808         if [ -L "$VARDIR" ]; then
 809                 dir="$(readlink "$VARDIR")"
 810                 # link maybe relative
 811                 cd "${VARDIR%/*}"
 812                 if ! mkdir -m 0755 -p "$dir"; then
 813                         error_exit "Failed to create needed" \
 814                                 "directory $dir"
 815                 fi
 816         else
 817                 if ! mkdir -m 0755 -p "$VARDIR"; then
 818                         error_exit "Failed to create needed" \
 819                                 "directory $VARDIR"
 820                 fi
 821         fi
 822 fi
 823
 824 if [ ! -d "$IFACEDIR" ]; then
 825         mkdir -m 0755 -p "$IFACEDIR" || \
 826                 error_exit "Failed to create needed directory $IFACEDIR"
 827         if [ "$cmd" = d ]; then
 828                 # Provide the same error messages as below
 829                 if ! ${force}; then
 830                         cd "$IFACEDIR"
 831                         for i in $args; do
 832                                 warn "No resolv.conf for interface $i"
 833                         done
 834                 fi
 835                 ${force}
 836                 exit $?
 837         fi
 838 fi
 839
 840 # An interface was added, changed, deleted or a general update was called.
 841 # Due to exclusivity we need to ensure that this is an atomic operation.
 842 # Our subscribers *may* need this as well if the init system is sub par.
 843 # As such we spinlock at this point as best we can.
 844 # We don't use flock(1) because it's not widely available and normally resides
 845 # in /usr which we do our very best to operate without.
 846 [ -w "$VARDIR" ] || error_exit "Cannot write to $LOCKDIR"
 847 : ${lock_timeout:=10}
 848 : ${clear_nopids:=5}
 849 have_pid=false
 850 had_pid=false
 851 while true; do
 852         if mkdir "$LOCKDIR" 2>/dev/null; then
 853                 trap 'rm -rf "$LOCKDIR";' EXIT
 854                 trap 'rm -rf "$LOCKDIR"; exit 1' INT QUIT ABRT SEGV ALRM TERM
 855                 echo $$ >"$LOCKDIR/pid"
 856                 break
 857         fi
 858         pid=$(cat "$LOCKDIR/pid" 2>/dev/null)
 859         if [ "$pid" -gt 0 ] 2>/dev/null; then
 860                 have_pid=true
 861                 had_pid=true
 862         else
 863                 have_pid=false
 864                 clear_nopids=$(($clear_nopids - 1))
 865                 if [ "$clear_nopids" -le 0 ]; then
 866                         warn "not seen a pid, clearing lock directory"
 867                         rm -rf "$LOCKDIR"
 868                 else
 869                         lock_timeout=$(($lock_timeout - 1))
 870                         sleep 1
 871                 fi
 872                 continue
 873         fi
 874         if $have_pid && ! kill -0 "$pid"; then
 875                 warn "clearing stale lock pid $pid"
 876                 rm -rf "$LOCKDIR"
 877                 continue
 878         fi
 879         lock_timeout=$(($lock_timeout - 1))
 880         if [ "$lock_timeout" -le 0 ]; then
 881                 if $have_pid; then
 882                         error_exit "timed out waiting for lock from pid $pid"
 883                 else
 884                         if $had_pid; then
 885                                 error_exit "timed out waiting for lock" \
 886                                         "from some pids"
 887                         else
 888                                 error_exit "timed out waiting for lock"
 889                         fi
 890                 fi
 891         fi
 892         sleep 1
 893 done
 894 unset have_pid had_pid clear_nopids
 895
 896 case "$cmd" in
 897 a)
 898         # Read resolv.conf from stdin
 899         resolv="$(cat)"
 900         changed=false
 901         changedfile=false
 902         # If what we are given matches what we have, then do nothing
 903         if [ -e "$IFACEDIR/$iface" ]; then
 904                 if [ "$(echo "$resolv")" != \
 905                         "$(cat "$IFACEDIR/$iface")" ]
 906                 then
 907                         changed=true
 908                         changedfile=true
 909                 fi
 910         else
 911                 changed=true
 912                 changedfile=true
 913         fi
 914
 915         # Set metric and private before creating the interface resolv.conf file
 916         # to ensure that it will have the correct flags
 917         [ ! -d "$METRICDIR" ] && mkdir "$METRICDIR"
 918         oldmetric="$METRICDIR/"*" $iface"
 919         newmetric=
 920         if [ -n "$IF_METRIC" ]; then
 921                 # Pad metric to 6 characters, so 5 is less than 10
 922                 while [ ${#IF_METRIC} -le 6 ]; do
 923                         IF_METRIC="0$IF_METRIC"
 924                 done
 925                 newmetric="$METRICDIR/$IF_METRIC $iface"
 926         fi
 927         rm -f "$METRICDIR/"*" $iface"
 928         [ "$oldmetric" != "$newmetric" ] &&
 929             [ "$oldmetric" != "$METRICDIR/* $iface" ] &&
 930                 changed=true
 931         [ -n "$newmetric" ] && echo " " >"$newmetric"
 932
 933         case "$IF_PRIVATE" in
 934         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 935                 if [ ! -d "$PRIVATEDIR" ]; then
 936                         [ -e "$PRIVATEDIR" ] && rm "$PRIVATEDIR"
 937                         mkdir "$PRIVATEDIR"
 938                 fi
 939                 [ -e "$PRIVATEDIR/$iface" ] || changed=true
 940                 [ -d "$PRIVATEDIR" ] && echo " " >"$PRIVATEDIR/$iface"
 941                 ;;
 942         *)
 943                 if [ -e "$PRIVATEDIR/$iface" ]; then
 944                         rm -f "$PRIVATEDIR/$iface"
 945                         changed=true
 946                 fi
 947                 ;;
 948         esac
 949
 950         oldexcl=
 951         for x in "$EXCLUSIVEDIR/"*" $iface"; do
 952                 if [ -f "$x" ]; then
 953                         oldexcl="$x"
 954                         break
 955                 fi
 956         done
 957         case "$IF_EXCLUSIVE" in
 958         [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
 959                 if [ ! -d "$EXCLUSIVEDIR" ]; then
 960                         [ -e "$EXCLUSIVEDIR" ] && rm "$EXCLUSIVEDIR"
 961                         mkdir "$EXCLUSIVEDIR"
 962                 fi
 963                 cd "$EXCLUSIVEDIR"
 964                 for x in *; do
 965                         [ -f "$x" ] && break
 966                 done
 967                 if [ "${x#* }" != "$iface" ]; then
 968                         if [ "$x" = "${x% *}" ]; then
 969                                 x=10000000
 970                         else
 971                                 x="${x% *}"
 972                         fi
 973                         if [ "$x" = "0000000" ]; then
 974                                 warn "exclusive underflow"
 975                         else
 976                                 x=$(($x - 1))
 977                         fi
 978                         if [ -d "$EXCLUSIVEDIR" ]; then
 979                                 echo " " >"$EXCLUSIVEDIR/$x $iface"
 980                         fi
 981                         changed=true
 982                 fi
 983                 ;;
 984         *)
 985                 if [ -f "$oldexcl" ]; then
 986                         rm -f "$oldexcl"
 987                         changed=true
 988                 fi
 989                 ;;
 990         esac
 991
 992         if $changedfile; then
 993                 printf "%s\n" "$resolv" >"$IFACEDIR/$iface" || exit $?
 994         elif ! $changed; then
 995                 exit 0
 996         fi
 997         unset changed changedfile oldmetric newmetric x oldexcl
 998         ;;
 999
1000 d)
1001         # Delete any existing information about the interface
1002         cd "$IFACEDIR"
1003         changed=false
1004         for i in $args; do
1005                 if [ -e "$i" ]; then
1006                         changed=true
1007                 elif ! ${force}; then
1008                         warn "No resolv.conf for interface $i"
1009                 fi
1010                 rm -f "$i" "$METRICDIR/"*" $i" \
1011                         "$PRIVATEDIR/$i" \
1012                         "$EXCLUSIVEDIR/"*" $i" || exit $?
1013         done
1014
1015         if ! $changed; then
1016                 # Set the return code based on the forced flag
1017                 $force
1018                 exit $?
1019         fi
1020         unset changed i
1021         ;;
1022
1023 C)
1024         # Mark interface as deprecated
1025         [ ! -d "$DEPRECATEDDIR" ] && mkdir "$DEPRECATEDDIR"
1026         cd "$DEPRECATEDDIR"
1027         changed=false
1028         for i in $args; do
1029                 if [ ! -e "$i" ]; then
1030                         changed=true
1031                         echo " " >"$i" || exit $?
1032                 fi
1033         done
1034         $changed || exit 0
1035         unset changed i
1036         ;;
1037
1038 c)
1039         # Mark interface as active
1040         if [ -d "$DEPRECATEDDIR" ]; then
1041                 cd "$DEPRECATEDDIR"
1042                 changed=false
1043                 for i in $args; do
1044                         if [ -e "$i" ]; then
1045                                 changed=true
1046                                 rm "$i" || exit $?
1047                         fi
1048                 done
1049                 $changed || exit 0
1050                 unset changed i
1051         fi
1052         ;;
1053 esac
1054
1055 case "${resolvconf:-YES}" in
1056 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) ;;
1057 *) exit 0;;
1058 esac
1059
1060 # Try and detect a suitable init system for our scripts
1061 detect_init
1062 export RESTARTCMD RCDIR _NOINIT_WARNED
1063
1064 eval "$(make_vars)"
1065 export RESOLVCONF DOMAINS SEARCH NAMESERVERS LOCALNAMESERVERS
1066 : ${list_resolv:=list_resolv -l}
1067 retval=0
1068
1069 # Run scripts in the same directory resolvconf is run from
1070 # in case any scripts accidentally dump files in the wrong place.
1071 cd "$_PWD"
1072 for script in "$LIBEXECDIR"/*; do
1073         if [ -f "$script" ]; then
1074                 eval script_enabled="\$${script##*/}"
1075                 case "${script_enabled:-YES}" in
1076                 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) ;;
1077                 *) continue;;
1078                 esac
1079                 if [ -x "$script" ]; then
1080                         "$script" "$cmd" "$iface"
1081                 else
1082                         (set -- "$cmd" "$iface"; . "$script")
1083                 fi
1084                 retval=$(($retval + $?))
1085         fi
1086 done
1087 exit $retval