package/network/services/dnsmasq/files/dnsmasq.init

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2007-2012 OpenWrt.org
   3
   4 START=60
   5
   6 USE_PROCD=1
   7 PROG=/usr/sbin/dnsmasq
   8
   9 DNS_SERVERS=""
  10 DOMAIN=""
  11
  12 ADD_LOCAL_DOMAIN=1
  13 ADD_LOCAL_HOSTNAME=1
  14
  15 CONFIGFILE="/var/etc/dnsmasq.conf"
  16 HOSTFILE="/tmp/hosts/dhcp"
  17 TRUSTANCHORSFILE="/usr/share/dnsmasq/trust-anchors.conf"
  18 TIMESTAMPFILE="/etc/dnsmasq.time"
  19
  20 xappend() {
  21         local value="$1"
  22
  23         echo "${value#--}" >> $CONFIGFILE
  24 }
  25
  26 dhcp_calc() {
  27         local ip="$1"
  28         local res=0
  29
  30         while [ -n "$ip" ]; do
  31                 part="${ip%%.*}"
  32                 res="$(($res * 256))"
  33                 res="$(($res + $part))"
  34                 [ "${ip%.*}" != "$ip" ] && ip="${ip#*.}" || ip=
  35         done
  36         echo "$res"
  37 }
  38
  39 dhcp_check() {
  40         local ifname="$1"
  41         local stamp="/var/run/dnsmasq.$ifname.dhcp"
  42         local rv=0
  43
  44         [ -s "$stamp" ] && return $(cat "$stamp")
  45
  46         udhcpc -n -q -s /bin/true -t 1 -i "$ifname" >&- && rv=1 || rv=0
  47
  48         [ $rv -eq 1 ] && \
  49                 logger -t dnsmasq \
  50                         "found already running DHCP-server on interface '$ifname'" \
  51                         "refusing to start, use 'option force 1' to override"
  52
  53         echo $rv > "$stamp"
  54         return $rv
  55 }
  56
  57 log_once() {
  58         pidof dnsmasq >/dev/null || \
  59                 logger -t dnsmasq "$@"
  60 }
  61
  62 append_bool() {
  63         local section="$1"
  64         local option="$2"
  65         local value="$3"
  66         local _loctmp
  67         config_get_bool _loctmp "$section" "$option" 0
  68         [ $_loctmp -gt 0 ] && xappend "$value"
  69 }
  70
  71 append_parm() {
  72         local section="$1"
  73         local option="$2"
  74         local switch="$3"
  75         local _loctmp
  76         config_get _loctmp "$section" "$option"
  77         [ -z "$_loctmp" ] && return 0
  78         xappend "$switch=$_loctmp"
  79 }
  80
  81 append_server() {
  82         xappend "--server=$1"
  83 }
  84
  85 append_address() {
  86         xappend "--address=$1"
  87 }
  88
  89 append_ipset() {
  90         xappend "--ipset=$1"
  91 }
  92
  93 append_interface() {
  94         local ifname=$(uci_get_state network "$1" ifname "$1")
  95         xappend "--interface=$ifname"
  96 }
  97
  98 append_notinterface() {
  99         local ifname=$(uci_get_state network "$1" ifname "$1")
 100         xappend "--except-interface=$ifname"
 101 }
 102
 103 append_addnhosts() {
 104         xappend "--addn-hosts=$1"
 105 }
 106
 107 append_bogusnxdomain() {
 108         xappend "--bogus-nxdomain=$1"
 109 }
 110
 111 append_pxe_service() {
 112         xappend "--pxe-service=$1"
 113 }
 114
 115 dnsmasq() {
 116         local cfg="$1"
 117         append_bool "$cfg" authoritative "--dhcp-authoritative"
 118         append_bool "$cfg" nodaemon "--no-daemon"
 119         append_bool "$cfg" domainneeded "--domain-needed"
 120         append_bool "$cfg" filterwin2k "--filterwin2k"
 121         append_bool "$cfg" nohosts "--no-hosts"
 122         append_bool "$cfg" nonegcache "--no-negcache"
 123         append_bool "$cfg" strictorder "--strict-order"
 124         append_bool "$cfg" logqueries "--log-queries=extra"
 125         append_bool "$cfg" noresolv "--no-resolv"
 126         append_bool "$cfg" localise_queries "--localise-queries"
 127         append_bool "$cfg" readethers "--read-ethers"
 128         append_bool "$cfg" dbus "--enable-dbus"
 129         append_bool "$cfg" boguspriv "--bogus-priv"
 130         append_bool "$cfg" expandhosts "--expand-hosts"
 131         append_bool "$cfg" enable_tftp "--enable-tftp"
 132         append_bool "$cfg" tftp_no_fail "--tftp-no-fail"
 133         append_bool "$cfg" nonwildcard "--bind-dynamic"
 134         append_bool "$cfg" fqdn "--dhcp-fqdn"
 135         append_bool "$cfg" proxydnssec "--proxy-dnssec"
 136         append_bool "$cfg" localservice "--local-service"
 137         append_bool "$cfg" quietdhcp "--quiet-dhcp"
 138         append_bool "$cfg" sequential_ip "--dhcp-sequential-ip"
 139         append_bool "$cfg" allservers "--all-servers"
 140         append_bool "$cfg" noping "--no-ping"
 141
 142         append_parm "$cfg" dhcpscript "--dhcp-script"
 143         append_parm "$cfg" cachesize "--cache-size"
 144         append_parm "$cfg" dnsforwardmax "--dns-forward-max"
 145         append_parm "$cfg" port "--port"
 146         append_parm "$cfg" ednspacket_max "--edns-packet-max"
 147         append_parm "$cfg" dhcpleasemax "--dhcp-lease-max"
 148         append_parm "$cfg" "queryport" "--query-port"
 149         append_parm "$cfg" "minport" "--min-port"
 150         append_parm "$cfg" "domain" "--domain"
 151         append_parm "$cfg" "local" "--server"
 152         config_list_foreach "$cfg" "server" append_server
 153         config_list_foreach "$cfg" "address" append_address
 154         config_list_foreach "$cfg" "ipset" append_ipset
 155         config_list_foreach "$cfg" "interface" append_interface
 156         config_list_foreach "$cfg" "notinterface" append_notinterface
 157         config_list_foreach "$cfg" "addnhosts" append_addnhosts
 158         config_list_foreach "$cfg" "bogusnxdomain" append_bogusnxdomain
 159         append_parm "$cfg" "leasefile" "--dhcp-leasefile"
 160         append_parm "$cfg" "resolvfile" "--resolv-file"
 161         append_parm "$cfg" "serversfile" "--servers-file"
 162         append_parm "$cfg" "tftp_root" "--tftp-root"
 163         append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
 164         append_parm "$cfg" "local_ttl" "--local-ttl"
 165         append_parm "$cfg" "pxe_prompt" "--pxe-prompt"
 166         config_list_foreach "$cfg" "pxe_service" append_pxe_service
 167         config_get DOMAIN "$cfg" domain
 168
 169         config_get_bool ADD_LOCAL_DOMAIN "$cfg" add_local_domain 1
 170         config_get_bool ADD_LOCAL_HOSTNAME "$cfg" add_local_hostname 1
 171
 172         config_get_bool readethers "$cfg" readethers
 173         [ "$readethers" = "1" -a \! -e "/etc/ethers" ] && touch /etc/ethers
 174
 175         config_get leasefile $cfg leasefile
 176         [ -n "$leasefile" -a \! -e "$leasefile" ] && touch "$leasefile"
 177         config_get_bool cachelocal "$cfg" cachelocal 1
 178
 179         config_get hostsfile "$cfg" dhcphostsfile
 180         [ -e "$hostsfile" ] && xappend "--dhcp-hostsfile=$hostsfile"
 181
 182         local rebind
 183         config_get_bool rebind "$cfg" rebind_protection 1
 184         [ $rebind -gt 0 ] && {
 185                 log_once \
 186                         "DNS rebinding protection is active," \
 187                         "will discard upstream RFC1918 responses!"
 188                 xappend "--stop-dns-rebind"
 189
 190                 local rebind_localhost
 191                 config_get_bool rebind_localhost "$cfg" rebind_localhost 0
 192                 [ $rebind_localhost -gt 0 ] && {
 193                         log_once "Allowing 127.0.0.0/8 responses"
 194                         xappend "--rebind-localhost-ok"
 195                 }
 196
 197                 append_rebind_domain() {
 198                         log_once "Allowing RFC1918 responses for domain $1"
 199                         xappend "--rebind-domain-ok=$1"
 200                 }
 201
 202                 config_list_foreach "$cfg" rebind_domain append_rebind_domain
 203         }
 204
 205         config_get_bool dnssec "$cfg" dnssec 0
 206         [ "$dnssec" -gt 0 ] && {
 207                 xappend "--conf-file=$TRUSTANCHORSFILE"
 208                 xappend "--dnssec"
 209                 xappend "--dnssec-timestamp=$TIMESTAMPFILE"
 210                 append_bool "$cfg" dnsseccheckunsigned "--dnssec-check-unsigned"
 211         }
 212
 213         dhcp_option_add "$cfg" "" 0
 214
 215         xappend "--dhcp-broadcast=tag:needs-broadcast"
 216
 217         mkdir -p /tmp/hosts /tmp/dnsmasq.d
 218         xappend "--addn-hosts=/tmp/hosts"
 219         xappend "--conf-dir=/tmp/dnsmasq.d"
 220
 221         echo >> $CONFIGFILE
 222 }
 223
 224 dhcp_subscrid_add() {
 225         local cfg="$1"
 226
 227         config_get networkid "$cfg" networkid
 228         [ -n "$networkid" ] || return 0
 229
 230         config_get subscriberid "$cfg" subscriberid
 231         [ -n "$subscriberid" ] || return 0
 232
 233         xappend "--dhcp-subscrid=$networkid,$subscriberid"
 234
 235         config_get_bool force "$cfg" force 0
 236
 237         dhcp_option_add "$cfg" "$networkid" "$force"
 238 }
 239
 240 dhcp_remoteid_add() {
 241         local cfg="$1"
 242
 243         config_get networkid "$cfg" networkid
 244         [ -n "$networkid" ] || return 0
 245
 246         config_get remoteid "$cfg" remoteid
 247         [ -n "$remoteid" ] || return 0
 248
 249         xappend "--dhcp-remoteid=$networkid,$remoteid"
 250
 251         config_get_bool force "$cfg" force 0
 252
 253         dhcp_option_add "$cfg" "$networkid" "$force"
 254 }
 255
 256 dhcp_circuitid_add() {
 257         local cfg="$1"
 258
 259         config_get networkid "$cfg" networkid
 260         [ -n "$networkid" ] || return 0
 261
 262         config_get circuitid "$cfg" circuitid
 263         [ -n "$circuitid" ] || return 0
 264
 265         xappend "--dhcp-circuitid=$networkid,$circuitid"
 266
 267         config_get_bool force "$cfg" force 0
 268
 269         dhcp_option_add "$cfg" "$networkid" "$force"
 270 }
 271
 272 dhcp_userclass_add() {
 273         local cfg="$1"
 274
 275         config_get networkid "$cfg" networkid
 276         [ -n "$networkid" ] || return 0
 277
 278         config_get userclass "$cfg" userclass
 279         [ -n "$userclass" ] || return 0
 280
 281         xappend "--dhcp-userclass=$networkid,$userclass"
 282
 283         config_get_bool force "$cfg" force 0
 284
 285         dhcp_option_add "$cfg" "$networkid" "$force"
 286 }
 287
 288 dhcp_vendorclass_add() {
 289         local cfg="$1"
 290
 291         config_get networkid "$cfg" networkid
 292         [ -n "$networkid" ] || return 0
 293
 294         config_get vendorclass "$cfg" vendorclass
 295         [ -n "$vendorclass" ] || return 0
 296
 297         xappend "--dhcp-vendorclass=$networkid,$vendorclass"
 298
 299         config_get_bool force "$cfg" force 0
 300
 301         dhcp_option_add "$cfg" "$networkid" "$force"
 302 }
 303
 304 dhcp_host_add() {
 305         local cfg="$1"
 306
 307         config_get_bool force "$cfg" force 0
 308
 309         config_get networkid "$cfg" networkid
 310         [ -n "$networkid" ] && dhcp_option_add "$cfg" "$networkid" "$force"
 311
 312         config_get name "$cfg" name
 313         config_get ip "$cfg" ip
 314         [ -n "$ip" -o -n "$name" ] || return 0
 315
 316         config_get_bool dns "$cfg" dns 0
 317         [ "$dns" = "1" -a -n "$ip" -a -n "$name" ] && {
 318                 echo "$ip $name${DOMAIN:+.$DOMAIN}" >> $HOSTFILE
 319         }
 320
 321         config_get mac "$cfg" mac
 322         if [ -n "$mac" ]; then
 323                 # --dhcp-host=00:20:e0:3b:13:af,192.168.0.199,lap
 324                 macs=""
 325                 for m in $mac; do append macs "$m" ","; done
 326         else
 327                 # --dhcp-host=lap,192.168.0.199
 328                 [ -n "$name" ] || return 0
 329                 macs="$name"
 330                 name=""
 331         fi
 332
 333         config_get tag "$cfg" tag
 334
 335         config_get_bool broadcast "$cfg" broadcast 0
 336         [ "$broadcast" = "0" ] && broadcast=
 337
 338         xappend "--dhcp-host=$macs${networkid:+,net:$networkid}${broadcast:+,set:needs-broadcast}${tag:+,set:$tag}${ip:+,$ip}${name:+,$name}"
 339 }
 340
 341 dhcp_tag_add() {
 342         local cfg="$1"
 343
 344         tag="$cfg"
 345
 346         [ -n "$tag" ] || return 0
 347
 348         config_get_bool force "$cfg" force 0
 349         [ "$force" = "0" ] && force=
 350
 351         config_get option "$cfg" dhcp_option
 352         for o in $option; do
 353                 xappend "--dhcp-option${force:+-force}=tag:$tag,$o"
 354         done
 355 }
 356
 357 dhcp_mac_add() {
 358         local cfg="$1"
 359
 360         config_get networkid "$cfg" networkid
 361         [ -n "$networkid" ] || return 0
 362
 363         config_get mac "$cfg" mac
 364         [ -n "$mac" ] || return 0
 365
 366         xappend "--dhcp-mac=$networkid,$mac"
 367
 368         dhcp_option_add "$cfg" "$networkid"
 369 }
 370
 371 dhcp_boot_add() {
 372         local cfg="$1"
 373
 374         config_get networkid "$cfg" networkid
 375
 376         config_get filename "$cfg" filename
 377         [ -n "$filename" ] || return 0
 378
 379         config_get servername "$cfg" servername
 380         config_get serveraddress "$cfg" serveraddress
 381
 382         [ -n "$serveraddress" -a ! -n "$servername" ] && return 0
 383
 384         xappend "--dhcp-boot=${networkid:+net:$networkid,}${filename}${servername:+,$servername}${serveraddress:+,$serveraddress}"
 385
 386         config_get_bool force "$cfg" force 0
 387
 388         dhcp_option_add "$cfg" "$networkid" "$force"
 389 }
 390
 391
 392 dhcp_add() {
 393         local cfg="$1"
 394         config_get net "$cfg" interface
 395         [ -n "$net" ] || return 0
 396
 397         config_get dhcpv4 "$cfg" dhcpv4
 398         [ "$dhcpv4" != "disabled" ] || return 0
 399
 400         config_get networkid "$cfg" networkid
 401         [ -n "$networkid" ] || networkid="$net"
 402
 403         network_get_subnet subnet "$net" || return 0
 404         network_get_device ifname "$net" || return 0
 405         network_get_protocol proto "$net" || return 0
 406
 407         [ "$cachelocal" = "0" ] && network_get_dnsserver dnsserver "$net" && {
 408                 DNS_SERVERS="$DNS_SERVERS $dnsserver"
 409         }
 410
 411         append_bool "$cfg" ignore "--no-dhcp-interface=$ifname" && return 0
 412
 413         # Do not support non-static interfaces for now
 414         [ static = "$proto" ] || return 0
 415
 416         # Override interface netmask with dhcp config if applicable
 417         config_get netmask "$cfg" netmask "${subnet##*/}"
 418
 419         #check for an already active dhcp server on the interface, unless 'force' is set
 420         config_get_bool force "$cfg" force 0
 421         [ $force -gt 0 ] || dhcp_check "$ifname" || return 0
 422
 423         config_get start "$cfg" start
 424         config_get limit "$cfg" limit
 425         config_get leasetime "$cfg" leasetime
 426         config_get options "$cfg" options
 427         config_get_bool dynamicdhcp "$cfg" dynamicdhcp 1
 428
 429         leasetime="${leasetime:-12h}"
 430         start="$(dhcp_calc "${start:-100}")"
 431         limit="${limit:-150}"
 432         [ "$limit" -gt 0 ] && limit=$((limit-1))
 433         eval "$(ipcalc.sh "${subnet%%/*}" $netmask $start $limit)"
 434         if [ "$dynamicdhcp" = "0" ]; then END="static"; fi
 435         xappend "--dhcp-range=$networkid,$START,$END,$NETMASK,$leasetime${options:+ $options}"
 436
 437         dhcp_option_add "$cfg" "$networkid"
 438 }
 439
 440 dhcp_option_add() {
 441         local cfg="$1"
 442         local networkid="$2"
 443         local force="$3"
 444
 445         [ "$force" = "0" ] && force=
 446
 447         config_get dhcp_option "$cfg" dhcp_option
 448         for o in $dhcp_option; do
 449                 xappend "--dhcp-option${force:+-force}=${networkid:+$networkid,}$o"
 450         done
 451
 452 }
 453
 454 dhcp_domain_add() {
 455         local cfg="$1"
 456         local ip name names record
 457
 458         config_get names "$cfg" name "$2"
 459         [ -n "$names" ] || return 0
 460
 461         config_get ip "$cfg" ip "$3"
 462         [ -n "$ip" ] || return 0
 463
 464         for name in $names; do
 465                 record="${record:+$record }$name"
 466         done
 467
 468         echo "$ip $record" >> $HOSTFILE
 469 }
 470
 471 dhcp_srv_add() {
 472         local cfg="$1"
 473
 474         config_get srv "$cfg" srv
 475         [ -n "$srv" ] || return 0
 476
 477         config_get target "$cfg" target
 478         [ -n "$target" ] || return 0
 479
 480         config_get port "$cfg" port
 481         [ -n "$port" ] || return 0
 482
 483         config_get class "$cfg" class
 484         config_get weight "$cfg" weight
 485
 486         local service="$srv,$target,$port${class:+,$class${weight:+,$weight}}"
 487
 488         xappend "--srv-host=$service"
 489 }
 490
 491 dhcp_mx_add() {
 492         local cfg="$1"
 493         local domain relay pref
 494
 495         config_get domain "$cfg" domain
 496         [ -n "$domain" ] || return 0
 497
 498         config_get relay "$cfg" relay
 499         [ -n "$relay" ] || return 0
 500
 501         config_get pref "$cfg" pref 0
 502
 503         local service="$domain,$relay,$pref"
 504
 505         xappend "--mx-host=$service"
 506 }
 507
 508 dhcp_cname_add() {
 509         local cfg="$1"
 510         local cname target
 511
 512         config_get cname "$cfg" cname
 513         [ -n "$cname" ] || return 0
 514
 515         config_get target "$cfg" target
 516         [ -n "$target" ] || return 0
 517
 518         xappend "--cname=${cname},${target}"
 519 }
 520
 521 dhcp_hostrecord_add() {
 522         local cfg="$1"
 523         local names addresses record val
 524
 525         config_get names "$cfg" name "$2"
 526         if [ -z "$names" ]; then
 527                 return 0
 528         fi
 529
 530         config_get addresses "$cfg" ip "$3"
 531         if [ -z "$addresses" ]; then
 532                 return 0
 533         fi
 534
 535         for val in $names $addresses; do
 536                 record="${record:+$record,}$val"
 537         done
 538
 539         xappend "--host-record=$record"
 540 }
 541
 542 service_triggers()
 543 {
 544         procd_add_reload_trigger "dhcp"
 545 }
 546
 547 boot() {
 548         # Will be launched through hotplug
 549         return 0
 550 }
 551
 552 start_service() {
 553         include /lib/functions
 554
 555         config_load dhcp
 556
 557         procd_open_instance
 558         procd_set_param command $PROG -C $CONFIGFILE -k -x /var/run/dnsmasq/dnsmasq.pid
 559         procd_set_param file $CONFIGFILE
 560         procd_set_param respawn
 561
 562         procd_add_jail dnsmasq ubus log
 563         procd_add_jail_mount $CONFIGFILE $TRUSTANCHORSFILE $HOSTFILE /etc/passwd /etc/group /etc/TZ /dev/null /dev/urandom /etc/dnsmasq.conf /tmp/dnsmasq.d /tmp/resolv.conf.auto /etc/hosts /etc/ethers
 564         procd_add_jail_mount_rw /var/run/dnsmasq/ /tmp/dhcp.leases $TIMESTAMPFILE
 565
 566         procd_close_instance
 567
 568         # before we can call xappend
 569         mkdir -p /var/run/dnsmasq/
 570         mkdir -p $(dirname $CONFIGFILE)
 571         mkdir -p /var/lib/misc
 572         touch /tmp/dhcp.leases
 573
 574         if [ ! -f "$TIMESTAMPFILE" ]; then
 575                 touch "$TIMESTAMPFILE"
 576                 chown nobody.nogroup "$TIMESTAMPFILE"
 577         fi
 578
 579         echo "# auto-generated config file from /etc/config/dhcp" > $CONFIGFILE
 580         echo "# auto-generated config file from /etc/config/dhcp" > $HOSTFILE
 581
 582         # if we did this last, we could override auto-generated config
 583         [ -f /etc/dnsmasq.conf ] && {
 584                 xappend "--conf-file=/etc/dnsmasq.conf"
 585         }
 586
 587         args=""
 588         config_foreach dnsmasq dnsmasq
 589         config_foreach dhcp_host_add host
 590         echo >> $CONFIGFILE
 591         config_foreach dhcp_boot_add boot
 592         config_foreach dhcp_mac_add mac
 593         config_foreach dhcp_tag_add tag
 594         config_foreach dhcp_vendorclass_add vendorclass
 595         config_foreach dhcp_userclass_add userclass
 596         config_foreach dhcp_circuitid_add circuitid
 597         config_foreach dhcp_remoteid_add remoteid
 598         config_foreach dhcp_subscrid_add subscrid
 599         config_foreach dhcp_domain_add domain
 600         config_foreach dhcp_hostrecord_add hostrecord
 601
 602         # add own hostname
 603         [ $ADD_LOCAL_HOSTNAME -eq 1 ] && {
 604                 local lanaddr lanaddr6
 605                 local ulaprefix="$(uci_get network @globals[0] ula_prefix)"
 606                 local hostname="$(uci_get system @system[0] hostname OpenWrt)"
 607
 608                 network_get_ipaddr lanaddr "lan" && {
 609                         dhcp_domain_add "" "$hostname" "$lanaddr"
 610                 }
 611
 612                 network_get_ipaddrs6 lanaddr6 "lan" && {
 613                         for lanaddr6 in $lanaddr6; do
 614                                 case "$lanaddr6" in
 615                                         "${ulaprefix%%:/*}"*)
 616                                                 dhcp_domain_add "" "$hostname" "${ulaprefix%%/*}1"
 617                                         ;;
 618                                 esac
 619                         done
 620                 }
 621         }
 622
 623         echo >> $CONFIGFILE
 624         config_foreach dhcp_srv_add srvhost
 625         config_foreach dhcp_mx_add mxhost
 626         echo >> $CONFIGFILE
 627
 628         config_get odhcpd_is_active odhcpd maindhcp
 629         if [ "$odhcpd_is_active" != "1" ]; then
 630                 config_foreach dhcp_add dhcp
 631         fi
 632
 633         echo >> $CONFIGFILE
 634         config_foreach dhcp_cname_add cname
 635         echo >> $CONFIGFILE
 636
 637         rm -f /tmp/resolv.conf
 638         [ $ADD_LOCAL_DOMAIN -eq 1 ] && [ -n "$DOMAIN" ] && {
 639                 echo "search $DOMAIN" >> /tmp/resolv.conf
 640         }
 641         DNS_SERVERS="$DNS_SERVERS 127.0.0.1"
 642         for DNS_SERVER in $DNS_SERVERS ; do
 643                 echo "nameserver $DNS_SERVER" >> /tmp/resolv.conf
 644         done
 645 }
 646
 647 reload_service() {
 648         rc_procd start_service "$@"
 649         return 0
 650 }
 651
 652 stop_service() {
 653         [ -f /tmp/resolv.conf ] && {
 654                 rm -f /tmp/resolv.conf
 655                 ln -s /tmp/resolv.conf.auto /tmp/resolv.conf
 656         }
 657         rm -f /var/run/dnsmasq.*.dhcp
 658 }