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 "$cfg" expandhosts "--expand-hosts"
 131         config_get tftp_root "$cfg" "tftp_root"
 132         [ -d "$tftp_root" ] && append_bool "$cfg" enable_tftp "--enable-tftp"
 133         append_bool "$cfg" tftp_no_fail "--tftp-no-fail"
 134         append_bool "$cfg" nonwildcard "--bind-dynamic"
 135         append_bool "$cfg" fqdn "--dhcp-fqdn"
 136         append_bool "$cfg" proxydnssec "--proxy-dnssec"
 137         append_bool "$cfg" localservice "--local-service"
 138         append_bool "$cfg" quietdhcp "--quiet-dhcp"
 139         append_bool "$cfg" sequential_ip "--dhcp-sequential-ip"
 140         append_bool "$cfg" allservers "--all-servers"
 141         append_bool "$cfg" noping "--no-ping"
 142
 143         append_parm "$cfg" dhcpscript "--dhcp-script"
 144         append_parm "$cfg" cachesize "--cache-size"
 145         append_parm "$cfg" dnsforwardmax "--dns-forward-max"
 146         append_parm "$cfg" port "--port"
 147         append_parm "$cfg" ednspacket_max "--edns-packet-max"
 148         append_parm "$cfg" dhcpleasemax "--dhcp-lease-max"
 149         append_parm "$cfg" "queryport" "--query-port"
 150         append_parm "$cfg" "minport" "--min-port"
 151         append_parm "$cfg" "domain" "--domain"
 152         append_parm "$cfg" "local" "--server"
 153         config_list_foreach "$cfg" "server" append_server
 154         config_list_foreach "$cfg" "address" append_address
 155         config_list_foreach "$cfg" "ipset" append_ipset
 156         config_list_foreach "$cfg" "interface" append_interface
 157         config_list_foreach "$cfg" "notinterface" append_notinterface
 158         config_list_foreach "$cfg" "addnhosts" append_addnhosts
 159         config_list_foreach "$cfg" "bogusnxdomain" append_bogusnxdomain
 160         append_parm "$cfg" "leasefile" "--dhcp-leasefile"
 161         append_parm "$cfg" "resolvfile" "--resolv-file"
 162         append_parm "$cfg" "serversfile" "--servers-file"
 163         append_parm "$cfg" "tftp_root" "--tftp-root"
 164         append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
 165         append_parm "$cfg" "local_ttl" "--local-ttl"
 166         append_parm "$cfg" "pxe_prompt" "--pxe-prompt"
 167         config_list_foreach "$cfg" "pxe_service" append_pxe_service
 168         config_get DOMAIN "$cfg" domain
 169
 170         config_get_bool ADD_LOCAL_DOMAIN "$cfg" add_local_domain 1
 171         config_get_bool ADD_LOCAL_HOSTNAME "$cfg" add_local_hostname 1
 172
 173         config_get_bool readethers "$cfg" readethers
 174         [ "$readethers" = "1" -a \! -e "/etc/ethers" ] && touch /etc/ethers
 175
 176         config_get leasefile $cfg leasefile
 177         [ -n "$leasefile" -a \! -e "$leasefile" ] && touch "$leasefile"
 178         config_get_bool cachelocal "$cfg" cachelocal 1
 179
 180         config_get hostsfile "$cfg" dhcphostsfile
 181         [ -e "$hostsfile" ] && xappend "--dhcp-hostsfile=$hostsfile"
 182
 183         local rebind
 184         config_get_bool rebind "$cfg" rebind_protection 1
 185         [ $rebind -gt 0 ] && {
 186                 log_once \
 187                         "DNS rebinding protection is active," \
 188                         "will discard upstream RFC1918 responses!"
 189                 xappend "--stop-dns-rebind"
 190
 191                 local rebind_localhost
 192                 config_get_bool rebind_localhost "$cfg" rebind_localhost 0
 193                 [ $rebind_localhost -gt 0 ] && {
 194                         log_once "Allowing 127.0.0.0/8 responses"
 195                         xappend "--rebind-localhost-ok"
 196                 }
 197
 198                 append_rebind_domain() {
 199                         log_once "Allowing RFC1918 responses for domain $1"
 200                         xappend "--rebind-domain-ok=$1"
 201                 }
 202
 203                 config_list_foreach "$cfg" rebind_domain append_rebind_domain
 204         }
 205
 206         config_get_bool dnssec "$cfg" dnssec 0
 207         [ "$dnssec" -gt 0 ] && {
 208                 xappend "--conf-file=$TRUSTANCHORSFILE"
 209                 xappend "--dnssec"
 210                 xappend "--dnssec-timestamp=$TIMESTAMPFILE"
 211                 append_bool "$cfg" dnsseccheckunsigned "--dnssec-check-unsigned"
 212         }
 213
 214         dhcp_option_add "$cfg" "" 0
 215
 216         xappend "--dhcp-broadcast=tag:needs-broadcast"
 217
 218         mkdir -p /tmp/hosts /tmp/dnsmasq.d
 219         xappend "--addn-hosts=/tmp/hosts"
 220         xappend "--conf-dir=/tmp/dnsmasq.d"
 221
 222         echo >> $CONFIGFILE
 223 }
 224
 225 dhcp_subscrid_add() {
 226         local cfg="$1"
 227
 228         config_get networkid "$cfg" networkid
 229         [ -n "$networkid" ] || return 0
 230
 231         config_get subscriberid "$cfg" subscriberid
 232         [ -n "$subscriberid" ] || return 0
 233
 234         xappend "--dhcp-subscrid=$networkid,$subscriberid"
 235
 236         config_get_bool force "$cfg" force 0
 237
 238         dhcp_option_add "$cfg" "$networkid" "$force"
 239 }
 240
 241 dhcp_remoteid_add() {
 242         local cfg="$1"
 243
 244         config_get networkid "$cfg" networkid
 245         [ -n "$networkid" ] || return 0
 246
 247         config_get remoteid "$cfg" remoteid
 248         [ -n "$remoteid" ] || return 0
 249
 250         xappend "--dhcp-remoteid=$networkid,$remoteid"
 251
 252         config_get_bool force "$cfg" force 0
 253
 254         dhcp_option_add "$cfg" "$networkid" "$force"
 255 }
 256
 257 dhcp_circuitid_add() {
 258         local cfg="$1"
 259
 260         config_get networkid "$cfg" networkid
 261         [ -n "$networkid" ] || return 0
 262
 263         config_get circuitid "$cfg" circuitid
 264         [ -n "$circuitid" ] || return 0
 265
 266         xappend "--dhcp-circuitid=$networkid,$circuitid"
 267
 268         config_get_bool force "$cfg" force 0
 269
 270         dhcp_option_add "$cfg" "$networkid" "$force"
 271 }
 272
 273 dhcp_userclass_add() {
 274         local cfg="$1"
 275
 276         config_get networkid "$cfg" networkid
 277         [ -n "$networkid" ] || return 0
 278
 279         config_get userclass "$cfg" userclass
 280         [ -n "$userclass" ] || return 0
 281
 282         xappend "--dhcp-userclass=$networkid,$userclass"
 283
 284         config_get_bool force "$cfg" force 0
 285
 286         dhcp_option_add "$cfg" "$networkid" "$force"
 287 }
 288
 289 dhcp_vendorclass_add() {
 290         local cfg="$1"
 291
 292         config_get networkid "$cfg" networkid
 293         [ -n "$networkid" ] || return 0
 294
 295         config_get vendorclass "$cfg" vendorclass
 296         [ -n "$vendorclass" ] || return 0
 297
 298         xappend "--dhcp-vendorclass=$networkid,$vendorclass"
 299
 300         config_get_bool force "$cfg" force 0
 301
 302         dhcp_option_add "$cfg" "$networkid" "$force"
 303 }
 304
 305 dhcp_host_add() {
 306         local cfg="$1"
 307
 308         config_get_bool force "$cfg" force 0
 309
 310         config_get networkid "$cfg" networkid
 311         [ -n "$networkid" ] && dhcp_option_add "$cfg" "$networkid" "$force"
 312
 313         config_get name "$cfg" name
 314         config_get ip "$cfg" ip
 315         [ -n "$ip" -o -n "$name" ] || return 0
 316
 317         config_get_bool dns "$cfg" dns 0
 318         [ "$dns" = "1" -a -n "$ip" -a -n "$name" ] && {
 319                 echo "$ip $name${DOMAIN:+.$DOMAIN}" >> $HOSTFILE
 320         }
 321
 322         config_get mac "$cfg" mac
 323         if [ -n "$mac" ]; then
 324                 # --dhcp-host=00:20:e0:3b:13:af,192.168.0.199,lap
 325                 macs=""
 326                 for m in $mac; do append macs "$m" ","; done
 327         else
 328                 # --dhcp-host=lap,192.168.0.199
 329                 [ -n "$name" ] || return 0
 330                 macs="$name"
 331                 name=""
 332         fi
 333
 334         config_get tag "$cfg" tag
 335
 336         config_get_bool broadcast "$cfg" broadcast 0
 337         [ "$broadcast" = "0" ] && broadcast=
 338
 339         xappend "--dhcp-host=$macs${networkid:+,net:$networkid}${broadcast:+,set:needs-broadcast}${tag:+,set:$tag}${ip:+,$ip}${name:+,$name}"
 340 }
 341
 342 dhcp_tag_add() {
 343         local cfg="$1"
 344
 345         tag="$cfg"
 346
 347         [ -n "$tag" ] || return 0
 348
 349         config_get_bool force "$cfg" force 0
 350         [ "$force" = "0" ] && force=
 351
 352         config_get option "$cfg" dhcp_option
 353         for o in $option; do
 354                 xappend "--dhcp-option${force:+-force}=tag:$tag,$o"
 355         done
 356 }
 357
 358 dhcp_mac_add() {
 359         local cfg="$1"
 360
 361         config_get networkid "$cfg" networkid
 362         [ -n "$networkid" ] || return 0
 363
 364         config_get mac "$cfg" mac
 365         [ -n "$mac" ] || return 0
 366
 367         xappend "--dhcp-mac=$networkid,$mac"
 368
 369         dhcp_option_add "$cfg" "$networkid"
 370 }
 371
 372 dhcp_boot_add() {
 373         local cfg="$1"
 374
 375         config_get networkid "$cfg" networkid
 376
 377         config_get filename "$cfg" filename
 378         [ -n "$filename" ] || return 0
 379
 380         config_get servername "$cfg" servername
 381         config_get serveraddress "$cfg" serveraddress
 382
 383         [ -n "$serveraddress" -a ! -n "$servername" ] && return 0
 384
 385         xappend "--dhcp-boot=${networkid:+net:$networkid,}${filename}${servername:+,$servername}${serveraddress:+,$serveraddress}"
 386
 387         config_get_bool force "$cfg" force 0
 388
 389         dhcp_option_add "$cfg" "$networkid" "$force"
 390 }
 391
 392
 393 dhcp_add() {
 394         local cfg="$1"
 395         config_get net "$cfg" interface
 396         [ -n "$net" ] || return 0
 397
 398         config_get dhcpv4 "$cfg" dhcpv4
 399         [ "$dhcpv4" != "disabled" ] || return 0
 400
 401         config_get networkid "$cfg" networkid
 402         [ -n "$networkid" ] || networkid="$net"
 403
 404         network_get_subnet subnet "$net" || return 0
 405         network_get_device ifname "$net" || return 0
 406         network_get_protocol proto "$net" || return 0
 407
 408         [ "$cachelocal" = "0" ] && network_get_dnsserver dnsserver "$net" && {
 409                 DNS_SERVERS="$DNS_SERVERS $dnsserver"
 410         }
 411
 412         append_bool "$cfg" ignore "--no-dhcp-interface=$ifname" && return 0
 413
 414         # Do not support non-static interfaces for now
 415         [ static = "$proto" ] || return 0
 416
 417         # Override interface netmask with dhcp config if applicable
 418         config_get netmask "$cfg" netmask "${subnet##*/}"
 419
 420         #check for an already active dhcp server on the interface, unless 'force' is set
 421         config_get_bool force "$cfg" force 0
 422         [ $force -gt 0 ] || dhcp_check "$ifname" || return 0
 423
 424         config_get start "$cfg" start
 425         config_get limit "$cfg" limit
 426         config_get leasetime "$cfg" leasetime
 427         config_get options "$cfg" options
 428         config_get_bool dynamicdhcp "$cfg" dynamicdhcp 1
 429
 430         leasetime="${leasetime:-12h}"
 431         start="$(dhcp_calc "${start:-100}")"
 432         limit="${limit:-150}"
 433         [ "$limit" -gt 0 ] && limit=$((limit-1))
 434         eval "$(ipcalc.sh "${subnet%%/*}" $netmask $start $limit)"
 435         if [ "$dynamicdhcp" = "0" ]; then END="static"; fi
 436         xappend "--dhcp-range=$networkid,$START,$END,$NETMASK,$leasetime${options:+ $options}"
 437
 438         dhcp_option_add "$cfg" "$networkid"
 439 }
 440
 441 dhcp_option_add() {
 442         local cfg="$1"
 443         local networkid="$2"
 444         local force="$3"
 445
 446         [ "$force" = "0" ] && force=
 447
 448         config_get dhcp_option "$cfg" dhcp_option
 449         for o in $dhcp_option; do
 450                 xappend "--dhcp-option${force:+-force}=${networkid:+$networkid,}$o"
 451         done
 452
 453 }
 454
 455 dhcp_domain_add() {
 456         local cfg="$1"
 457         local ip name names record
 458
 459         config_get names "$cfg" name "$2"
 460         [ -n "$names" ] || return 0
 461
 462         config_get ip "$cfg" ip "$3"
 463         [ -n "$ip" ] || return 0
 464
 465         for name in $names; do
 466                 record="${record:+$record }$name"
 467         done
 468
 469         echo "$ip $record" >> $HOSTFILE
 470 }
 471
 472 dhcp_srv_add() {
 473         local cfg="$1"
 474
 475         config_get srv "$cfg" srv
 476         [ -n "$srv" ] || return 0
 477
 478         config_get target "$cfg" target
 479         [ -n "$target" ] || return 0
 480
 481         config_get port "$cfg" port
 482         [ -n "$port" ] || return 0
 483
 484         config_get class "$cfg" class
 485         config_get weight "$cfg" weight
 486
 487         local service="$srv,$target,$port${class:+,$class${weight:+,$weight}}"
 488
 489         xappend "--srv-host=$service"
 490 }
 491
 492 dhcp_mx_add() {
 493         local cfg="$1"
 494         local domain relay pref
 495
 496         config_get domain "$cfg" domain
 497         [ -n "$domain" ] || return 0
 498
 499         config_get relay "$cfg" relay
 500         [ -n "$relay" ] || return 0
 501
 502         config_get pref "$cfg" pref 0
 503
 504         local service="$domain,$relay,$pref"
 505
 506         xappend "--mx-host=$service"
 507 }
 508
 509 dhcp_cname_add() {
 510         local cfg="$1"
 511         local cname target
 512
 513         config_get cname "$cfg" cname
 514         [ -n "$cname" ] || return 0
 515
 516         config_get target "$cfg" target
 517         [ -n "$target" ] || return 0
 518
 519         xappend "--cname=${cname},${target}"
 520 }
 521
 522 dhcp_hostrecord_add() {
 523         local cfg="$1"
 524         local names addresses record val
 525
 526         config_get names "$cfg" name "$2"
 527         if [ -z "$names" ]; then
 528                 return 0
 529         fi
 530
 531         config_get addresses "$cfg" ip "$3"
 532         if [ -z "$addresses" ]; then
 533                 return 0
 534         fi
 535
 536         for val in $names $addresses; do
 537                 record="${record:+$record,}$val"
 538         done
 539
 540         xappend "--host-record=$record"
 541 }
 542
 543 service_triggers()
 544 {
 545         procd_add_reload_trigger "dhcp"
 546 }
 547
 548 boot() {
 549         # Will be launched through hotplug
 550         return 0
 551 }
 552
 553 start_service() {
 554         include /lib/functions
 555
 556         config_load dhcp
 557
 558         procd_open_instance
 559         procd_set_param command $PROG -C $CONFIGFILE -k -x /var/run/dnsmasq/dnsmasq.pid
 560         procd_set_param file $CONFIGFILE
 561         procd_set_param respawn
 562
 563         procd_add_jail dnsmasq ubus log
 564         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
 565         procd_add_jail_mount_rw /var/run/dnsmasq/ /tmp/dhcp.leases $TIMESTAMPFILE
 566
 567         procd_close_instance
 568
 569         # before we can call xappend
 570         mkdir -p /var/run/dnsmasq/
 571         mkdir -p $(dirname $CONFIGFILE)
 572         mkdir -p /var/lib/misc
 573         touch /tmp/dhcp.leases
 574
 575         if [ ! -f "$TIMESTAMPFILE" ]; then
 576                 touch "$TIMESTAMPFILE"
 577                 chown nobody.nogroup "$TIMESTAMPFILE"
 578         fi
 579
 580         echo "# auto-generated config file from /etc/config/dhcp" > $CONFIGFILE
 581         echo "# auto-generated config file from /etc/config/dhcp" > $HOSTFILE
 582
 583         # if we did this last, we could override auto-generated config
 584         [ -f /etc/dnsmasq.conf ] && {
 585                 xappend "--conf-file=/etc/dnsmasq.conf"
 586         }
 587
 588         args=""
 589         config_foreach dnsmasq dnsmasq
 590         config_foreach dhcp_host_add host
 591         echo >> $CONFIGFILE
 592         config_foreach dhcp_boot_add boot
 593         config_foreach dhcp_mac_add mac
 594         config_foreach dhcp_tag_add tag
 595         config_foreach dhcp_vendorclass_add vendorclass
 596         config_foreach dhcp_userclass_add userclass
 597         config_foreach dhcp_circuitid_add circuitid
 598         config_foreach dhcp_remoteid_add remoteid
 599         config_foreach dhcp_subscrid_add subscrid
 600         config_foreach dhcp_domain_add domain
 601         config_foreach dhcp_hostrecord_add hostrecord
 602
 603         # add own hostname
 604         [ $ADD_LOCAL_HOSTNAME -eq 1 ] && {
 605                 local lanaddr lanaddr6
 606                 local ulaprefix="$(uci_get network @globals[0] ula_prefix)"
 607                 local hostname="$(uci_get system @system[0] hostname OpenWrt)"
 608
 609                 network_get_ipaddr lanaddr "lan" && {
 610                         dhcp_domain_add "" "$hostname" "$lanaddr"
 611                 }
 612
 613                 [ -n "$ulaprefix" ] && network_get_ipaddrs6 lanaddr6 "lan" && {
 614                         for lanaddr6 in $lanaddr6; do
 615                                 case "$lanaddr6" in
 616                                         "${ulaprefix%%:/*}"*)
 617                                                 dhcp_domain_add "" "$hostname" "$lanaddr6"
 618                                         ;;
 619                                 esac
 620                         done
 621                 }
 622         }
 623
 624         echo >> $CONFIGFILE
 625         config_foreach dhcp_srv_add srvhost
 626         config_foreach dhcp_mx_add mxhost
 627         echo >> $CONFIGFILE
 628
 629         config_get odhcpd_is_active odhcpd maindhcp
 630         if [ "$odhcpd_is_active" != "1" ]; then
 631                 config_foreach dhcp_add dhcp
 632         fi
 633
 634         echo >> $CONFIGFILE
 635         config_foreach dhcp_cname_add cname
 636         echo >> $CONFIGFILE
 637
 638         rm -f /tmp/resolv.conf
 639         [ $ADD_LOCAL_DOMAIN -eq 1 ] && [ -n "$DOMAIN" ] && {
 640                 echo "search $DOMAIN" >> /tmp/resolv.conf
 641         }
 642         DNS_SERVERS="$DNS_SERVERS 127.0.0.1"
 643         for DNS_SERVER in $DNS_SERVERS ; do
 644                 echo "nameserver $DNS_SERVER" >> /tmp/resolv.conf
 645         done
 646 }
 647
 648 reload_service() {
 649         rc_procd start_service "$@"
 650         return 0
 651 }
 652
 653 stop_service() {
 654         [ -f /tmp/resolv.conf ] && {
 655                 rm -f /tmp/resolv.conf
 656                 ln -s /tmp/resolv.conf.auto /tmp/resolv.conf
 657         }
 658         rm -f /var/run/dnsmasq.*.dhcp
 659 }