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

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2007-2012 OpenWrt.org
   3
   4 START=19
   5
   6 USE_PROCD=1
   7 PROG=/usr/sbin/dnsmasq
   8
   9 ADD_LOCAL_DOMAIN=1
  10 ADD_LOCAL_HOSTNAME=1
  11 ADD_WAN_FQDN=0
  12 ADD_LOCAL_FQDN=""
  13
  14 BASECONFIGFILE="/var/etc/dnsmasq.conf"
  15 BASEHOSTFILE="/tmp/hosts/dhcp"
  16 TRUSTANCHORSFILE="/usr/share/dnsmasq/trust-anchors.conf"
  17 TIMEVALIDFILE="/var/state/dnsmasqsec"
  18 BASEDHCPSTAMPFILE="/var/run/dnsmasq"
  19 DHCPBOGUSHOSTNAMEFILE="/usr/share/dnsmasq/dhcpbogushostname.conf"
  20 RFC6761FILE="/usr/share/dnsmasq/rfc6761.conf"
  21 DHCPSCRIPT="/usr/lib/dnsmasq/dhcp-script.sh"
  22 DHCPSCRIPT_DEPENDS="/usr/share/libubox/jshn.sh /usr/bin/jshn /bin/ubus"
  23
  24 DNSMASQ_DHCP_VER=4
  25
  26 dnsmasq_ignore_opt() {
  27         local opt="$1"
  28
  29         if [ -z "$dnsmasq_features" ]; then
  30                 dnsmasq_features="$(dnsmasq --version | grep -m1 'Compile time options:' | cut -d: -f2) "
  31                 [ "${dnsmasq_features#* DHCP }" = "$dnsmasq_features" ] || dnsmasq_has_dhcp=1
  32                 [ "${dnsmasq_features#* DHCPv6 }" = "$dnsmasq_features" ] || dnsmasq_has_dhcp6=1
  33                 [ "${dnsmasq_features#* DNSSEC }" = "$dnsmasq_features" ] || dnsmasq_has_dnssec=1
  34                 [ "${dnsmasq_features#* TFTP }" = "$dnsmasq_features" ] || dnsmasq_has_tftp=1
  35                 [ "${dnsmasq_features#* ipset }" = "$dnsmasq_features" ] || dnsmasq_has_ipset=1
  36         fi
  37
  38         case "$opt" in
  39                 dhcp-duid|\
  40                 ra-param)
  41                         [ -z "$dnsmasq_has_dhcp6" ] ;;
  42                 dhcp-*|\
  43                 bootp-*|\
  44                 pxe-*)
  45                         [ -z "$dnsmasq_has_dhcp" ] ;;
  46                 dnssec*|\
  47                 trust-anchor)
  48                         if [ -z "$dnsmasq_has_dnssec" ]; then
  49                                 echo "dnsmasq: \"$opt\" requested, but dnssec support is not available" >&2
  50                                 exit 1
  51                         fi
  52                         return 1
  53                         ;;
  54                 tftp-*)
  55                         [ -z "$dnsmasq_has_tftp" ] ;;
  56                 ipset)
  57                         [ -z "$dnsmasq_has_ipset" ] ;;
  58                 *)
  59                         return 1
  60         esac
  61 }
  62
  63 xappend() {
  64         local value="${1#--}"
  65         local opt="${value%%=*}"
  66
  67         if ! dnsmasq_ignore_opt "$opt"; then
  68                 echo "$value" >>$CONFIGFILE_TMP
  69         fi
  70 }
  71
  72 hex_to_hostid() {
  73         local var="$1"
  74         local hex="${2#0x}" # strip optional "0x" prefix
  75
  76         if [ -n "${hex//[0-9a-fA-F]/}" ]; then
  77                 # is invalid hex literal
  78                 return 1
  79         fi
  80
  81         # convert into host id
  82         export "$var=$(
  83                 printf "%0x:%0x" \
  84                 $(((0x$hex >> 16) % 65536)) \
  85                 $(( 0x$hex        % 65536))
  86                 )"
  87
  88         return 0
  89 }
  90
  91 dhcp_calc() {
  92         local ip="$1"
  93         local res=0
  94
  95         while [ -n "$ip" ]; do
  96                 part="${ip%%.*}"
  97                 res="$(($res * 256))"
  98                 res="$(($res + $part))"
  99                 [ "${ip%.*}" != "$ip" ] && ip="${ip#*.}" || ip=
 100         done
 101         echo "$res"
 102 }
 103
 104 dhcp_check() {
 105         local ifname="$1"
 106         local stamp="${BASEDHCPSTAMPFILE_CFG}.${ifname}.dhcp"
 107         local rv=0
 108
 109         [ -s "$stamp" ] && return $(cat "$stamp")
 110
 111         # If interface is down, skip it.
 112         # The init script will be called again once the link is up
 113         case "$(devstatus "$ifname" | jsonfilter -e @.up)" in
 114                 false) return 1;;
 115         esac
 116
 117         udhcpc -n -q -s /bin/true -t 1 -i "$ifname" >&- && rv=1 || rv=0
 118
 119         echo $rv > "$stamp"
 120         return $rv
 121 }
 122
 123 log_once() {
 124         pidof dnsmasq >/dev/null || \
 125                 logger -t dnsmasq "$@"
 126 }
 127
 128 has_handler() {
 129         local file
 130
 131         for file in /etc/hotplug.d/dhcp/* /etc/hotplug.d/tftp/* /etc/hotplug.d/neigh/*; do
 132                 [ -f "$file" ] && return 0
 133         done
 134
 135         return 1
 136 }
 137
 138 append_bool() {
 139         local section="$1"
 140         local option="$2"
 141         local value="$3"
 142         local default="$4"
 143         local _loctmp
 144         [ -z "$default" ] && default="0"
 145         config_get_bool _loctmp "$section" "$option" "$default"
 146         [ $_loctmp -gt 0 ] && xappend "$value"
 147 }
 148
 149 append_parm() {
 150         local section="$1"
 151         local option="$2"
 152         local switch="$3"
 153         local default="$4"
 154         local _loctmp
 155         config_get _loctmp "$section" "$option" "$default"
 156         [ -z "$_loctmp" ] && return 0
 157         xappend "$switch=$_loctmp"
 158 }
 159
 160 append_server() {
 161         xappend "--server=$1"
 162 }
 163
 164 append_rev_server() {
 165         xappend "--rev-server=$1"
 166 }
 167
 168 append_address() {
 169         xappend "--address=$1"
 170 }
 171
 172 append_ipset() {
 173         xappend "--ipset=$1"
 174 }
 175
 176 append_interface() {
 177         network_get_device ifname "$1" || ifname="$1"
 178         xappend "--interface=$ifname"
 179 }
 180
 181 append_listenaddress() {
 182         xappend "--listen-address=$1"
 183 }
 184
 185 append_notinterface() {
 186         network_get_device ifname "$1" || ifname="$1"
 187         xappend "--except-interface=$ifname"
 188 }
 189
 190 append_addnhosts() {
 191         append EXTRA_MOUNT "$1"
 192         xappend "--addn-hosts=$1"
 193 }
 194
 195 append_bogusnxdomain() {
 196         xappend "--bogus-nxdomain=$1"
 197 }
 198
 199 append_pxe_service() {
 200         xappend "--pxe-service=$1"
 201 }
 202
 203 append_interface_name() {
 204         xappend "--interface-name=$1,$2"
 205 }
 206
 207 filter_dnsmasq() {
 208         local cfg="$1" func="$2" match_cfg="$3" found_cfg
 209
 210         # use entry when no instance entry set, or if it matches
 211         config_get found_cfg "$cfg" "instance"
 212         if [ -z "$found_cfg" ] || [ "$found_cfg" = "$match_cfg" ]; then
 213                 $func $cfg
 214         fi
 215 }
 216
 217 dhcp_subscrid_add() {
 218         local cfg="$1"
 219
 220         config_get networkid "$cfg" networkid
 221         [ -n "$networkid" ] || return 0
 222
 223         config_get subscriberid "$cfg" subscriberid
 224         [ -n "$subscriberid" ] || return 0
 225
 226         xappend "--dhcp-subscrid=$networkid,$subscriberid"
 227
 228         config_get_bool force "$cfg" force 0
 229
 230         dhcp_option_add "$cfg" "$networkid" "$force"
 231 }
 232
 233 dhcp_remoteid_add() {
 234         local cfg="$1"
 235
 236         config_get networkid "$cfg" networkid
 237         [ -n "$networkid" ] || return 0
 238
 239         config_get remoteid "$cfg" remoteid
 240         [ -n "$remoteid" ] || return 0
 241
 242         xappend "--dhcp-remoteid=$networkid,$remoteid"
 243
 244         config_get_bool force "$cfg" force 0
 245
 246         dhcp_option_add "$cfg" "$networkid" "$force"
 247 }
 248
 249 dhcp_circuitid_add() {
 250         # TODO: DHCPV6 does not have circuitid; catch "option6:"
 251         local cfg="$1"
 252
 253         config_get networkid "$cfg" networkid
 254         [ -n "$networkid" ] || return 0
 255
 256         config_get circuitid "$cfg" circuitid
 257         [ -n "$circuitid" ] || return 0
 258
 259         xappend "--dhcp-circuitid=$networkid,$circuitid"
 260
 261         config_get_bool force "$cfg" force 0
 262
 263         dhcp_option_add "$cfg" "$networkid" "$force"
 264 }
 265
 266 dhcp_userclass_add() {
 267         local cfg="$1"
 268
 269         config_get networkid "$cfg" networkid
 270         [ -n "$networkid" ] || return 0
 271
 272         config_get userclass "$cfg" userclass
 273         [ -n "$userclass" ] || return 0
 274
 275         xappend "--dhcp-userclass=$networkid,$userclass"
 276
 277         config_get_bool force "$cfg" force 0
 278
 279         dhcp_option_add "$cfg" "$networkid" "$force"
 280 }
 281
 282 dhcp_vendorclass_add() {
 283         # TODO: DHCPV6 vendor class has stricter definitions; catch? fixup?
 284         local cfg="$1"
 285
 286         config_get networkid "$cfg" networkid
 287         [ -n "$networkid" ] || return 0
 288
 289         config_get vendorclass "$cfg" vendorclass
 290         [ -n "$vendorclass" ] || return 0
 291
 292         xappend "--dhcp-vendorclass=$networkid,$vendorclass"
 293
 294         config_get_bool force "$cfg" force 0
 295
 296         dhcp_option_add "$cfg" "$networkid" "$force"
 297 }
 298
 299 dhcp_match_add() {
 300         local cfg="$1"
 301
 302         config_get networkid "$cfg" networkid
 303         [ -n "$networkid" ] || return 0
 304
 305         config_get match "$cfg" match
 306         [ -n "$match" ] || return 0
 307
 308         xappend "--dhcp-match=$networkid,$match"
 309
 310         config_get_bool force "$cfg" force 0
 311
 312         dhcp_option_add "$cfg" "$networkid" "$force"
 313 }
 314
 315 dhcp_host_add() {
 316         local cfg="$1"
 317         local hosttag nametime addrs duids macs tags
 318
 319         config_get_bool force "$cfg" force 0
 320
 321         config_get networkid "$cfg" networkid
 322         [ -n "$networkid" ] && dhcp_option_add "$cfg" "$networkid" "$force"
 323
 324         config_get_bool enable "$cfg" enable 1
 325         [ "$enable" = "0" ] && return 0
 326
 327         config_get name "$cfg" name
 328         config_get ip "$cfg" ip
 329         config_get hostid "$cfg" hostid
 330
 331         [ -z "$ip" ] && [ -z "$name" ] && [ -z "$hostid" ] && return 0
 332
 333         config_get_bool dns "$cfg" dns 0
 334         [ "$dns" = "1" ] && [ -n "$ip" ] && [ -n "$name" ] && {
 335                 echo "$ip $name${DOMAIN:+.$DOMAIN}" >> $HOSTFILE_TMP
 336         }
 337
 338         config_get mac "$cfg" mac
 339         config_get duid "$cfg" duid
 340         config_get tag "$cfg" tag
 341
 342         if [ -n "$mac" ]; then
 343                 # --dhcp-host=00:20:e0:3b:13:af,192.168.0.199,lap
 344                 # many MAC are possible to track a laptop ON/OFF dock
 345                 for m in $mac; do append macs "$m" ","; done
 346         fi
 347
 348         if [ $DNSMASQ_DHCP_VER -eq 6 ] && [ -n "$duid" ]; then
 349                 # --dhcp-host=id:00:03:00:01:12:00:00:01:02:03,[::beef],lap
 350                 # one (virtual) machine gets one DUID per RFC3315
 351                 duids="id:${duid// */}"
 352         fi
 353
 354         if [ -z "$macs" ] && [ -z "$duids" ]; then
 355                 # --dhcp-host=lap,192.168.0.199,[::beef]
 356                 [ -n "$name" ] || return 0
 357                 macs="$name"
 358                 name=""
 359         fi
 360
 361         if [ -n "$hostid" ]; then
 362                 hex_to_hostid hostid "$hostid"
 363         fi
 364
 365         if [ -n "$tag" ]; then
 366                 for t in $tag; do append tags "$t" ",set:"; done
 367         fi
 368
 369         config_get_bool broadcast "$cfg" broadcast 0
 370         config_get leasetime "$cfg" leasetime
 371
 372         [ "$broadcast" = "0" ] && broadcast= || broadcast=",set:needs-broadcast"
 373
 374         hosttag="${networkid:+,set:${networkid}}${tags:+,set:${tags}}$broadcast"
 375         nametime="${name:+,$name}${leasetime:+,$leasetime}"
 376
 377         if [ $DNSMASQ_DHCP_VER -eq 6 ]; then
 378                 addrs="${ip:+,$ip}${hostid:+,[::$hostid]}"
 379                 xappend "--dhcp-host=$macs${duids:+,$duids}$hosttag$addrs$nametime"
 380         else
 381                 xappend "--dhcp-host=$macs$hosttag${ip:+,$ip}$nametime"
 382         fi
 383 }
 384
 385 dhcp_this_host_add() {
 386         local net="$1"
 387         local ifname="$2"
 388         local mode="$3"
 389         local routerstub routername ifdashname
 390         local lanaddr lanaddr6 lanaddrs6 ulaprefix
 391
 392         if [ "$mode" -gt 0 ] ; then
 393                 ifdashname="${ifname//./-}"
 394                 routerstub="$( md5sum /etc/os-release )"
 395                 routerstub="router-${routerstub// */}"
 396                 routername="$( uci_get system @system[0] hostname $routerstub )"
 397
 398                 if [ "$mode" -gt 1 ] ; then
 399                         if [ "$mode" -gt 2 ] ; then
 400                                 if [ "$mode" -gt 3 ] ; then
 401                                         append_interface_name "$ifdashname.$routername.$DOMAIN" "$ifname"
 402                                 fi
 403
 404                                 append_interface_name "$routername.$DOMAIN" "$ifname"
 405                         fi
 406
 407                         # All IP addresses discovered by dnsmasq will be labeled (except fe80::)
 408                         append_interface_name "$routername" "$ifname"
 409
 410                 else
 411                         # This uses a static host file entry for only limited addresses.
 412                         # Use dnsmasq option "--expandhosts" to enable FQDN on host files.
 413                         ulaprefix="$(uci_get network @globals[0] ula_prefix)"
 414                         network_get_ipaddr lanaddr "$net"
 415                         network_get_ipaddrs6 lanaddrs6 "$net"
 416
 417                         if [ -n "$lanaddr" ] ; then
 418                                 dhcp_domain_add "" "$routername" "$lanaddr"
 419                         fi
 420
 421                         if [ -n "$ulaprefix" ] && [ -n "$lanaddrs6" ] ; then
 422                                 for lanaddr6 in $lanaddrs6 ; do
 423                                         case "$lanaddr6" in
 424                                         "${ulaprefix%%:/*}"*)
 425                                                 dhcp_domain_add "" "$routername" "$lanaddr6"
 426                                                 ;;
 427                                         esac
 428                                 done
 429                         fi
 430                 fi
 431         fi
 432 }
 433
 434 dhcp_tag_add() {
 435         # NOTE: dnsmasq has explicit "option6:" prefix for DHCPv6 so no collisions
 436         local cfg="$1"
 437
 438         tag="$cfg"
 439
 440         [ -n "$tag" ] || return 0
 441
 442         config_get_bool force "$cfg" force 0
 443         [ "$force" = "0" ] && force=
 444
 445         config_get option "$cfg" dhcp_option
 446         for o in $option; do
 447                 xappend "--dhcp-option${force:+-force}=tag:$tag,$o"
 448         done
 449 }
 450
 451 dhcp_mac_add() {
 452         local cfg="$1"
 453
 454         config_get networkid "$cfg" networkid
 455         [ -n "$networkid" ] || return 0
 456
 457         config_get mac "$cfg" mac
 458         [ -n "$mac" ] || return 0
 459
 460         xappend "--dhcp-mac=$networkid,$mac"
 461
 462         dhcp_option_add "$cfg" "$networkid"
 463 }
 464
 465 dhcp_boot_add() {
 466         # TODO: BOOTURL is different between DHCPv4 and DHCPv6
 467         local cfg="$1"
 468
 469         config_get networkid "$cfg" networkid
 470
 471         config_get filename "$cfg" filename
 472         [ -n "$filename" ] || return 0
 473
 474         config_get servername "$cfg" servername
 475         config_get serveraddress "$cfg" serveraddress
 476
 477         [ -n "$serveraddress" ] && [ ! -n "$servername" ] && return 0
 478
 479         xappend "--dhcp-boot=${networkid:+net:$networkid,}${filename}${servername:+,$servername}${serveraddress:+,$serveraddress}"
 480
 481         config_get_bool force "$cfg" force 0
 482
 483         dhcp_option_add "$cfg" "$networkid" "$force"
 484 }
 485
 486
 487 dhcp_add() {
 488         local cfg="$1"
 489         local dhcp6range="::"
 490         local nettag
 491         local tags
 492
 493         config_get net "$cfg" interface
 494         [ -n "$net" ] || return 0
 495
 496         config_get networkid "$cfg" networkid
 497         [ -n "$networkid" ] || networkid="$net"
 498
 499         network_get_device ifname "$net" || return 0
 500
 501         [ "$cachelocal" = "0" ] && network_get_dnsserver dnsserver "$net" && {
 502                 DNS_SERVERS="$DNS_SERVERS $dnsserver"
 503         }
 504
 505         append_bool "$cfg" ignore "--no-dhcp-interface=$ifname" && {
 506                 # Many ISP do not have useful names for DHCP customers (your WAN).
 507                 dhcp_this_host_add "$net" "$ifname" "$ADD_WAN_FQDN"
 508                 return 0
 509         }
 510
 511         network_get_subnet subnet "$net" || return 0
 512         network_get_protocol proto "$net" || return 0
 513
 514         # Do not support non-static interfaces for now
 515         [ static = "$proto" ] || return 0
 516
 517         # Override interface netmask with dhcp config if applicable
 518         config_get netmask "$cfg" netmask "${subnet##*/}"
 519
 520         #check for an already active dhcp server on the interface, unless 'force' is set
 521         config_get_bool force "$cfg" force 0
 522         [ $force -gt 0 ] || dhcp_check "$ifname" || {
 523                 logger -t dnsmasq \
 524                         "found already running DHCP-server on interface '$ifname'" \
 525                         "refusing to start, use 'option force 1' to override"
 526                 return 0
 527         }
 528
 529         config_get start "$cfg" start 100
 530         config_get limit "$cfg" limit 150
 531         config_get leasetime "$cfg" leasetime 12h
 532         config_get options "$cfg" options
 533         config_get_bool dynamicdhcp "$cfg" dynamicdhcp 1
 534
 535         config_get dhcpv4 "$cfg" dhcpv4
 536         config_get dhcpv6 "$cfg" dhcpv6
 537
 538         config_get ra "$cfg" ra
 539         config_get ra_management "$cfg" ra_management
 540         config_get ra_preference "$cfg" ra_preference
 541         config_get dns "$cfg" dns
 542
 543         config_list_foreach "$cfg" "interface_name" append_interface_name "$ifname"
 544
 545         # Put the router host name on this DHCP served interface address(es)
 546         dhcp_this_host_add "$net" "$ifname" "$ADD_LOCAL_FQDN"
 547
 548         start="$( dhcp_calc "$start" )"
 549
 550         add_tag() {
 551                 tags="${tags}tag:$1,"
 552         }
 553         config_list_foreach "$cfg" tag add_tag
 554
 555         nettag="${networkid:+set:${networkid},}"
 556
 557         if [ "$limit" -gt 0 ] ; then
 558                 limit=$((limit-1))
 559         fi
 560
 561         eval "$(ipcalc.sh "${subnet%%/*}" $netmask $start $limit)"
 562
 563         if [ "$dynamicdhcp" = "0" ] ; then
 564                 END="static"
 565                 dhcp6range="::,static"
 566         else
 567                 dhcp6range="::1000,::ffff"
 568         fi
 569
 570
 571         if [ "$dhcpv4" != "disabled" ] ; then
 572                 xappend "--dhcp-range=$tags$nettag$START,$END,$NETMASK,$leasetime${options:+ $options}"
 573         fi
 574
 575
 576         if [ $DNSMASQ_DHCP_VER -eq 6 ] && [ "$ra" = "server" ] ; then
 577                 # Note: dnsmasq cannot just be a DHCPv6 server (all-in-1)
 578                 # and let some other machine(s) send RA pointing to it.
 579
 580                 case $ra_preference in
 581                 *high*)
 582                         xappend "--ra-param=$ifname,high,0,7200"
 583                         ;;
 584                 *low*)
 585                         xappend "--ra-param=$ifname,low,0,7200"
 586                         ;;
 587                 *)
 588                         # Send UNSOLICITED RA at default interval and live for 2 hours.
 589                         # TODO: convert flexible lease time into route life time (only seconds).
 590                         xappend "--ra-param=$ifname,0,7200"
 591                         ;;
 592                 esac
 593
 594                 if [ "$dhcpv6" = "disabled" ] ; then
 595                         ra_management="3"
 596                 fi
 597
 598
 599                 case $ra_management in
 600                 0)
 601                         # SLACC with DCHP for extended options
 602                         xappend "--dhcp-range=$nettag::,constructor:$ifname,ra-stateless,ra-names"
 603                         ;;
 604                 2)
 605                         # DHCP address and RA only for management redirection
 606                         xappend "--dhcp-range=$nettag$dhcp6range,constructor:$ifname,$leasetime"
 607                         ;;
 608                 3)
 609                         # SLAAC only but dnsmasq attempts to link HOSTNAME, DHCPv4 MAC, and SLAAC
 610                         xappend "--dhcp-range=$nettag::,constructor:$ifname,ra-only,ra-names"
 611                         ;;
 612                 *)
 613                         # SLAAC and full DHCP
 614                         xappend "--dhcp-range=$nettag$dhcp6range,constructor:$ifname,slaac,ra-names,$leasetime"
 615                         ;;
 616                 esac
 617
 618                 if [ -n "$dns" ]; then
 619                         dnss=""
 620                         for d in $dns; do append dnss "[$d]" ","; done
 621                 else
 622                         dnss="[::]"
 623                 fi
 624
 625                 dhcp_option_append "option6:dns-server,$dnss" "$networkid"
 626         fi
 627
 628         dhcp_option_add "$cfg" "$networkid" 0
 629         dhcp_option_add "$cfg" "$networkid" 2
 630 }
 631
 632 dhcp_option_append() {
 633         local option="$1"
 634         local networkid="$2"
 635         local force="$3"
 636
 637         xappend "--dhcp-option${force:+-force}=${networkid:+$networkid,}$option"
 638 }
 639
 640 dhcp_option_add() {
 641         # NOTE: dnsmasq has explicit "option6:" prefix for DHCPv6 so no collisions
 642         local cfg="$1"
 643         local networkid="$2"
 644         local force="$3"
 645         local opt="dhcp_option"
 646
 647         [ "$force" = "0" ] && force=
 648         [ "$force" = "2" ] && opt="dhcp_option_force"
 649
 650         local list_len
 651         config_get list_len "$cfg" "${opt}_LENGTH"
 652
 653         if [ -n "$list_len" ]; then
 654                 config_list_foreach "$cfg" "$opt" dhcp_option_append "$networkid" "$force"
 655         else
 656                 config_get dhcp_option "$cfg" "$opt"
 657
 658                 [ -n "$dhcp_option" ] && echo "Warning: the 'option $opt' syntax is deprecated, use 'list $opt'" >&2
 659
 660                 local option
 661                 for option in $dhcp_option; do
 662                         dhcp_option_append "$option" "$networkid" "$force"
 663                 done
 664         fi
 665 }
 666
 667 dhcp_domain_add() {
 668         local cfg="$1"
 669         local ip name names record
 670
 671         config_get names "$cfg" name "$2"
 672         [ -n "$names" ] || return 0
 673
 674         config_get ip "$cfg" ip "$3"
 675         [ -n "$ip" ] || return 0
 676
 677         for name in $names; do
 678                 record="${record:+$record }$name"
 679         done
 680
 681         echo "$ip $record" >> $HOSTFILE_TMP
 682 }
 683
 684 dhcp_srv_add() {
 685         local cfg="$1"
 686
 687         config_get srv "$cfg" srv
 688         [ -n "$srv" ] || return 0
 689
 690         config_get target "$cfg" target
 691         [ -n "$target" ] || return 0
 692
 693         config_get port "$cfg" port
 694         [ -n "$port" ] || return 0
 695
 696         config_get class "$cfg" class
 697         config_get weight "$cfg" weight
 698
 699         local service="$srv,$target,$port${class:+,$class${weight:+,$weight}}"
 700
 701         xappend "--srv-host=$service"
 702 }
 703
 704 dhcp_mx_add() {
 705         local cfg="$1"
 706         local domain relay pref
 707
 708         config_get domain "$cfg" domain
 709         [ -n "$domain" ] || return 0
 710
 711         config_get relay "$cfg" relay
 712         [ -n "$relay" ] || return 0
 713
 714         config_get pref "$cfg" pref 0
 715
 716         local service="$domain,$relay,$pref"
 717
 718         xappend "--mx-host=$service"
 719 }
 720
 721 dhcp_cname_add() {
 722         local cfg="$1"
 723         local cname target
 724
 725         config_get cname "$cfg" cname
 726         [ -n "$cname" ] || return 0
 727
 728         config_get target "$cfg" target
 729         [ -n "$target" ] || return 0
 730
 731         xappend "--cname=${cname},${target}"
 732 }
 733
 734 dhcp_hostrecord_add() {
 735         local cfg="$1"
 736         local names addresses record val
 737
 738         config_get names "$cfg" name "$2"
 739         if [ -z "$names" ]; then
 740                 return 0
 741         fi
 742
 743         config_get addresses "$cfg" ip "$3"
 744         if [ -z "$addresses" ]; then
 745                 return 0
 746         fi
 747
 748         for val in $names $addresses; do
 749                 record="${record:+$record,}$val"
 750         done
 751
 752         xappend "--host-record=$record"
 753 }
 754
 755 dhcp_relay_add() {
 756         local cfg="$1"
 757         local local_addr server_addr interface
 758
 759         config_get local_addr "$cfg" local_addr
 760         [ -n "$local_addr" ] || return 0
 761
 762         config_get server_addr "$cfg" server_addr
 763         [ -n "$server_addr" ] || return 0
 764
 765         config_get interface "$cfg" interface
 766         if [ -z "$interface" ]; then
 767                 xappend "--dhcp-relay=$local_addr,$server_addr"
 768         else
 769                 network_get_device ifname "$interface" || return
 770                 xappend "--dhcp-relay=$local_addr,$server_addr,$ifname"
 771         fi
 772 }
 773
 774 dnsmasq_ipset_add() {
 775         local cfg="$1"
 776         local ipsets domains
 777
 778         add_ipset() {
 779                 ipsets="${ipsets:+$ipsets,}$1"
 780         }
 781
 782         add_domain() {
 783                 # leading '/' is expected
 784                 domains="$domains/$1"
 785         }
 786
 787         config_list_foreach "$cfg" "name" add_ipset
 788         config_list_foreach "$cfg" "domain" add_domain
 789
 790         if [ -z "$ipsets" ] || [ -z "$domains" ]; then
 791                 return 0
 792         fi
 793
 794         xappend "--ipset=$domains/$ipsets"
 795 }
 796
 797 dnsmasq_start()
 798 {
 799         local cfg="$1"
 800         local disabled user_dhcpscript
 801         local resolvfile resolvdir localuse=0
 802
 803         config_get_bool disabled "$cfg" disabled 0
 804         [ "$disabled" -gt 0 ] && return 0
 805
 806         # reset list of DOMAINS and DNS servers (for each dnsmasq instance)
 807         DNS_SERVERS=""
 808         DOMAIN=""
 809         CONFIGFILE="${BASECONFIGFILE}.${cfg}"
 810         CONFIGFILE_TMP="${CONFIGFILE}.$$"
 811         HOSTFILE="${BASEHOSTFILE}.${cfg}"
 812         HOSTFILE_TMP="${HOSTFILE}.$$"
 813         BASEDHCPSTAMPFILE_CFG="${BASEDHCPSTAMPFILE}.${cfg}"
 814
 815         # before we can call xappend
 816         mkdir -p /var/run/dnsmasq/
 817         mkdir -p $(dirname $CONFIGFILE)
 818         mkdir -p $(dirname $HOSTFILE)
 819         mkdir -p /var/lib/misc
 820         chown dnsmasq:dnsmasq /var/run/dnsmasq
 821
 822         echo "# auto-generated config file from /etc/config/dhcp" > $CONFIGFILE_TMP
 823         echo "# auto-generated config file from /etc/config/dhcp" > $HOSTFILE_TMP
 824
 825         local dnsmasqconffile="/etc/dnsmasq.${cfg}.conf"
 826         if [ ! -r "$dnsmasqconffile" ]; then
 827                 dnsmasqconffile=/etc/dnsmasq.conf
 828         fi
 829
 830         # if we did this last, we could override auto-generated config
 831         [ -f "${dnsmasqconffile}" ] && {
 832                 xappend "--conf-file=${dnsmasqconffile}"
 833         }
 834
 835         $PROG --version | grep -osqE "^Compile time options:.* DHCPv6( |$)" && DHCPv6CAPABLE=1 || DHCPv6CAPABLE=0
 836
 837
 838         if [ -x /usr/sbin/odhcpd ] && [ -x /etc/init.d/odhcpd ] ; then
 839                 local odhcpd_is_main odhcpd_is_enabled
 840                 config_get odhcpd_is_main odhcpd maindhcp 0
 841                 /etc/init.d/odhcpd enabled && odhcpd_is_enabled=1 || odhcpd_is_enabled=0
 842
 843
 844                 if [ "$odhcpd_is_enabled" -eq 0 ] && [ "$DHCPv6CAPABLE" -eq 1 ] ; then
 845                         # DHCP V4 and V6 in DNSMASQ
 846                         DNSMASQ_DHCP_VER=6
 847                 elif [ "$odhcpd_is_main" -gt 0 ] ; then
 848                         # ODHCPD is doing it all
 849                         DNSMASQ_DHCP_VER=0
 850                 else
 851                         # You have ODHCPD but use DNSMASQ for DHCPV4
 852                         DNSMASQ_DHCP_VER=4
 853                 fi
 854
 855         elif [ "$DHCPv6CAPABLE" -eq 1 ] ; then
 856                 # DHCP V4 and V6 in DNSMASQ
 857                 DNSMASQ_DHCP_VER=6
 858         else
 859                 DNSMASQ_DHCP_VER=4
 860         fi
 861
 862         # Allow DHCP/DHCPv6 to be handled by ISC DHCPD
 863         if [ -x /usr/sbin/dhcpd ] ; then
 864                 if [ -x /etc/init.d/dhcpd ] ; then
 865                         /etc/init.d/dhcpd enabled && DNSMASQ_DHCP_VER=0
 866                 fi
 867                 if [ -x /etc/init.d/dhcpd6 ] && [ "$DNSMASQ_DHCP_VER" -gt 0 ] ; then
 868                         /etc/init.d/dhcpd6 enabled && DNSMASQ_DHCP_VER=4
 869                 fi
 870         fi
 871
 872         append_bool "$cfg" authoritative "--dhcp-authoritative"
 873         append_bool "$cfg" nodaemon "--no-daemon"
 874         append_bool "$cfg" domainneeded "--domain-needed"
 875         append_bool "$cfg" filterwin2k "--filterwin2k"
 876         append_bool "$cfg" nohosts "--no-hosts"
 877         append_bool "$cfg" nonegcache "--no-negcache"
 878         append_bool "$cfg" strictorder "--strict-order"
 879         append_bool "$cfg" logqueries "--log-queries=extra"
 880         append_bool "$cfg" noresolv "--no-resolv"
 881         append_bool "$cfg" localise_queries "--localise-queries"
 882         append_bool "$cfg" readethers "--read-ethers"
 883
 884         local instance_name="dnsmasq.$cfg"
 885         if [ "$cfg" = "$DEFAULT_INSTANCE" ]; then
 886                 instance_name="dnsmasq"
 887         fi
 888         config_get_bool dbus "$cfg" "dbus" 0
 889         [ $dbus -gt 0 ] && xappend "--enable-dbus=uk.org.thekelleys.$instance_name"
 890         config_get_bool ubus "$cfg" "ubus" 1
 891         [ $ubus -gt 0 ] && xappend "--enable-ubus=$instance_name"
 892
 893         append_bool "$cfg" expandhosts "--expand-hosts"
 894         config_get tftp_root "$cfg" "tftp_root"
 895         [ -n "$tftp_root" ] && mkdir -p "$tftp_root" && append_bool "$cfg" enable_tftp "--enable-tftp"
 896         append_bool "$cfg" tftp_no_fail "--tftp-no-fail"
 897         append_bool "$cfg" nonwildcard "--bind-dynamic" 1
 898         append_bool "$cfg" fqdn "--dhcp-fqdn"
 899         append_bool "$cfg" proxydnssec "--proxy-dnssec"
 900         append_bool "$cfg" localservice "--local-service"
 901         append_bool "$cfg" logdhcp "--log-dhcp"
 902         append_bool "$cfg" quietdhcp "--quiet-dhcp"
 903         append_bool "$cfg" sequential_ip "--dhcp-sequential-ip"
 904         append_bool "$cfg" allservers "--all-servers"
 905         append_bool "$cfg" noping "--no-ping"
 906         append_bool "$cfg" rapidcommit "--dhcp-rapid-commit"
 907         append_bool "$cfg" scriptarp "--script-arp"
 908
 909         append_parm "$cfg" logfacility "--log-facility"
 910
 911         append_parm "$cfg" cachesize "--cache-size"
 912         append_parm "$cfg" dnsforwardmax "--dns-forward-max"
 913         append_parm "$cfg" port "--port"
 914         append_parm "$cfg" ednspacket_max "--edns-packet-max"
 915         append_parm "$cfg" dhcpleasemax "--dhcp-lease-max"
 916         append_parm "$cfg" "queryport" "--query-port"
 917         append_parm "$cfg" "minport" "--min-port"
 918         append_parm "$cfg" "maxport" "--max-port"
 919         append_parm "$cfg" "domain" "--domain"
 920         append_parm "$cfg" "local" "--local"
 921         config_list_foreach "$cfg" "listen_address" append_listenaddress
 922         config_list_foreach "$cfg" "server" append_server
 923         config_list_foreach "$cfg" "rev_server" append_rev_server
 924         config_list_foreach "$cfg" "address" append_address
 925         config_list_foreach "$cfg" "ipset" append_ipset
 926         [ -n "$BOOT" ] || {
 927                 config_list_foreach "$cfg" "interface" append_interface
 928                 config_list_foreach "$cfg" "notinterface" append_notinterface
 929         }
 930         config_list_foreach "$cfg" "addnhosts" append_addnhosts
 931         config_list_foreach "$cfg" "bogusnxdomain" append_bogusnxdomain
 932         append_parm "$cfg" "leasefile" "--dhcp-leasefile" "/tmp/dhcp.leases"
 933         append_parm "$cfg" "serversfile" "--servers-file"
 934         append_parm "$cfg" "tftp_root" "--tftp-root"
 935         append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
 936         append_parm "$cfg" "local_ttl" "--local-ttl"
 937         append_parm "$cfg" "max_ttl" "--max-ttl"
 938         append_parm "$cfg" "min_cache_ttl" "--min-cache-ttl"
 939         append_parm "$cfg" "max_cache_ttl" "--max-cache-ttl"
 940         append_parm "$cfg" "pxe_prompt" "--pxe-prompt"
 941         append_parm "$cfg" "tftp_unique_root" "--tftp-unique-root"
 942         config_list_foreach "$cfg" "pxe_service" append_pxe_service
 943         config_get DOMAIN "$cfg" domain
 944
 945         config_get_bool ADD_LOCAL_DOMAIN "$cfg" add_local_domain 1
 946         config_get_bool ADD_LOCAL_HOSTNAME "$cfg" add_local_hostname 1
 947         config_get ADD_LOCAL_FQDN "$cfg" add_local_fqdn ""
 948         config_get ADD_WAN_FQDN "$cfg" add_wan_fqdn 0
 949
 950         if [ -z "$ADD_LOCAL_FQDN" ] ; then
 951                 # maintain support for previous UCI
 952                 ADD_LOCAL_FQDN="$ADD_LOCAL_HOSTNAME"
 953         fi
 954
 955         config_get user_dhcpscript $cfg dhcpscript
 956         if has_handler || [ -n "$user_dhcpscript" ]; then
 957                 xappend "--dhcp-script=$DHCPSCRIPT"
 958                 xappend "--script-arp"
 959         fi
 960
 961         config_get leasefile $cfg leasefile "/tmp/dhcp.leases"
 962         [ -n "$leasefile" ] && [ ! -e "$leasefile" ] && touch "$leasefile"
 963         config_get_bool cachelocal "$cfg" cachelocal 1
 964
 965         config_get_bool noresolv "$cfg" noresolv 0
 966         if [ "$noresolv" != "1" ]; then
 967                 config_get resolvfile "$cfg" resolvfile /tmp/resolv.conf.d/resolv.conf.auto
 968                 [ -n "$resolvfile" ] && [ ! -e "$resolvfile" ] && touch "$resolvfile"
 969                 xappend "--resolv-file=$resolvfile"
 970                 [ "$resolvfile" = "/tmp/resolv.conf.d/resolv.conf.auto" ] && localuse=1
 971                 resolvdir="$(dirname "$resolvfile")"
 972         fi
 973         config_get_bool localuse "$cfg" localuse "$localuse"
 974
 975         config_get hostsfile "$cfg" dhcphostsfile
 976         [ -e "$hostsfile" ] && xappend "--dhcp-hostsfile=$hostsfile"
 977
 978         local rebind
 979         config_get_bool rebind "$cfg" rebind_protection 1
 980         [ $rebind -gt 0 ] && {
 981                 log_once \
 982                         "DNS rebinding protection is active," \
 983                         "will discard upstream RFC1918 responses!"
 984                 xappend "--stop-dns-rebind"
 985
 986                 local rebind_localhost
 987                 config_get_bool rebind_localhost "$cfg" rebind_localhost 0
 988                 [ $rebind_localhost -gt 0 ] && {
 989                         log_once "Allowing 127.0.0.0/8 responses"
 990                         xappend "--rebind-localhost-ok"
 991                 }
 992
 993                 append_rebind_domain() {
 994                         log_once "Allowing RFC1918 responses for domain $1"
 995                         xappend "--rebind-domain-ok=$1"
 996                 }
 997
 998                 config_list_foreach "$cfg" rebind_domain append_rebind_domain
 999         }
1000
1001         config_get_bool dnssec "$cfg" dnssec 0
1002         [ "$dnssec" -gt 0 ] && {
1003                 xappend "--conf-file=$TRUSTANCHORSFILE"
1004                 xappend "--dnssec"
1005                 [ -x /etc/init.d/sysntpd ] && {
1006                         if /etc/init.d/sysntpd enabled || [ "$(uci_get system.ntp.enabled)" = "1" ] ; then
1007                                 [ -f "$TIMEVALIDFILE" ] || xappend "--dnssec-no-timecheck"
1008                         fi
1009                 }
1010                 config_get_bool dnsseccheckunsigned "$cfg" dnsseccheckunsigned 1
1011                 [ "$dnsseccheckunsigned" -eq 0 ] && xappend "--dnssec-check-unsigned=no"
1012         }
1013
1014         config_get addmac "$cfg" addmac 0
1015         [ "$addmac" != "0" ] && {
1016                 [ "$addmac" = "1" ] && addmac=
1017                 xappend "--add-mac${addmac:+="$addmac"}"
1018         }
1019
1020         dhcp_option_add "$cfg" "" 0
1021         dhcp_option_add "$cfg" "" 2
1022
1023         xappend "--dhcp-broadcast=tag:needs-broadcast"
1024
1025         config_get_bool ignore_hosts_dir "$cfg" ignore_hosts_dir 0
1026         if [ "$ignore_hosts_dir" = "1" ]; then
1027                 xappend "--addn-hosts=$HOSTFILE"
1028         else
1029                 xappend "--addn-hosts=$(dirname $HOSTFILE)"
1030         fi
1031
1032         config_get dnsmasqconfdir "$cfg" confdir "/tmp/dnsmasq.d"
1033         xappend "--conf-dir=$dnsmasqconfdir"
1034         dnsmasqconfdir="${dnsmasqconfdir%%,*}"
1035         [ ! -d "$dnsmasqconfdir" ] && mkdir -p $dnsmasqconfdir
1036         xappend "--user=dnsmasq"
1037         xappend "--group=dnsmasq"
1038         echo >> $CONFIGFILE_TMP
1039
1040         config_get_bool enable_tftp "$cfg" enable_tftp 0
1041         [ "$enable_tftp" -gt 0 ] && {
1042                 config_get tftp_root "$cfg" tftp_root
1043                 append EXTRA_MOUNT $tftp_root
1044         }
1045
1046         config_foreach filter_dnsmasq host dhcp_host_add "$cfg"
1047         echo >> $CONFIGFILE_TMP
1048
1049         config_get_bool dhcpbogushostname "$cfg" dhcpbogushostname 1
1050         [ "$dhcpbogushostname" -gt 0 ] && {
1051                 xappend "--dhcp-ignore-names=tag:dhcp_bogus_hostname"
1052                 [ -r "$DHCPBOGUSHOSTNAMEFILE" ] && xappend "--conf-file=$DHCPBOGUSHOSTNAMEFILE"
1053         }
1054
1055         config_foreach filter_dnsmasq boot dhcp_boot_add "$cfg"
1056         config_foreach filter_dnsmasq mac dhcp_mac_add "$cfg"
1057         config_foreach filter_dnsmasq tag dhcp_tag_add "$cfg"
1058         config_foreach filter_dnsmasq vendorclass dhcp_vendorclass_add "$cfg"
1059         config_foreach filter_dnsmasq userclass dhcp_userclass_add "$cfg"
1060         config_foreach filter_dnsmasq circuitid dhcp_circuitid_add "$cfg"
1061         config_foreach filter_dnsmasq remoteid dhcp_remoteid_add "$cfg"
1062         config_foreach filter_dnsmasq subscrid dhcp_subscrid_add "$cfg"
1063         config_foreach filter_dnsmasq match dhcp_match_add "$cfg"
1064         config_foreach filter_dnsmasq domain dhcp_domain_add "$cfg"
1065         config_foreach filter_dnsmasq hostrecord dhcp_hostrecord_add "$cfg"
1066         [ -n "$BOOT" ] || config_foreach filter_dnsmasq relay dhcp_relay_add "$cfg"
1067
1068         echo >> $CONFIGFILE_TMP
1069         config_foreach filter_dnsmasq srvhost dhcp_srv_add "$cfg"
1070         config_foreach filter_dnsmasq mxhost dhcp_mx_add "$cfg"
1071         echo >> $CONFIGFILE_TMP
1072
1073         config_get_bool boguspriv "$cfg" boguspriv 1
1074         [ "$boguspriv" -gt 0 ] && {
1075                 xappend "--bogus-priv"
1076                 [ -r "$RFC6761FILE" ] && xappend "--conf-file=$RFC6761FILE"
1077         }
1078
1079         if [ "$DNSMASQ_DHCP_VER" -gt 4 ] ; then
1080                 # Enable RA feature for when/if it is constructed,
1081                 # and RA is selected per interface pool (RA, DHCP, or both),
1082                 # but no one (should) want RA broadcast in syslog
1083                 [ -n "$BOOT" ] || config_foreach filter_dnsmasq dhcp dhcp_add "$cfg"
1084                 xappend "--enable-ra"
1085                 xappend "--quiet-ra"
1086                 append_bool "$cfg" quietdhcp "--quiet-dhcp6"
1087
1088         elif [ "$DNSMASQ_DHCP_VER" -gt 0 ] ; then
1089                 [ -n "$BOOT" ] || config_foreach filter_dnsmasq dhcp dhcp_add "$cfg"
1090         fi
1091
1092
1093         echo >> $CONFIGFILE_TMP
1094         config_foreach filter_dnsmasq cname dhcp_cname_add "$cfg"
1095         echo >> $CONFIGFILE_TMP
1096
1097         echo >> $CONFIGFILE_TMP
1098         config_foreach filter_dnsmasq ipset dnsmasq_ipset_add "$cfg"
1099         echo >> $CONFIGFILE_TMP
1100
1101         echo >> $CONFIGFILE_TMP
1102         mv -f $CONFIGFILE_TMP $CONFIGFILE
1103         mv -f $HOSTFILE_TMP $HOSTFILE
1104
1105         [ "$localuse" -gt 0 ] && {
1106                 rm -f /tmp/resolv.conf
1107                 [ $ADD_LOCAL_DOMAIN -eq 1 ] && [ -n "$DOMAIN" ] && {
1108                         echo "search $DOMAIN" >> /tmp/resolv.conf
1109                 }
1110                 DNS_SERVERS="$DNS_SERVERS 127.0.0.1"
1111                 [ -e /proc/sys/net/ipv6 ] && DNS_SERVERS="$DNS_SERVERS ::1"
1112                 for DNS_SERVER in $DNS_SERVERS ; do
1113                         echo "nameserver $DNS_SERVER" >> /tmp/resolv.conf
1114                 done
1115         }
1116
1117         procd_open_instance $cfg
1118         procd_set_param command $PROG -C $CONFIGFILE -k -x /var/run/dnsmasq/dnsmasq."${cfg}".pid
1119         procd_set_param file $CONFIGFILE
1120         [ -n "$user_dhcpscript" ] && procd_set_param env USER_DHCPSCRIPT="$user_dhcpscript"
1121         procd_set_param respawn
1122
1123         procd_add_jail dnsmasq ubus log
1124         procd_add_jail_mount $CONFIGFILE $TRUSTANCHORSFILE $HOSTFILE $RFC6761FILE
1125         procd_add_jail_mount $EXTRA_MOUNT $DHCPBOGUSHOSTNAMEFILE $DHCPSCRIPT $DHCPSCRIPT_DEPENDS
1126         procd_add_jail_mount $dnsmasqconffile $dnsmasqconfdir $resolvdir $user_dhcpscript
1127         procd_add_jail_mount /dev/null /dev/urandom
1128         procd_add_jail_mount /etc/passwd /etc/group /etc/TZ /etc/hosts /etc/ethers
1129         procd_add_jail_mount_rw /var/run/dnsmasq/ $leasefile
1130
1131         procd_close_instance
1132 }
1133
1134 dnsmasq_stop()
1135 {
1136         local cfg="$1"
1137         local noresolv resolvfile localuse=0
1138
1139         config_get_bool noresolv "$cfg" noresolv 0
1140         config_get resolvfile "$cfg" "resolvfile"
1141
1142         [ "$noresolv" = 0 ] && [ "$resolvfile" = "/tmp/resolv.conf.d/resolv.conf.auto" ] && localuse=1
1143         config_get_bool localuse "$cfg" localuse "$localuse"
1144         [ "$localuse" -gt 0 ] && ln -sf "/tmp/resolv.conf.d/resolv.conf.auto" /tmp/resolv.conf
1145
1146         rm -f ${BASEDHCPSTAMPFILE}.${cfg}.*.dhcp
1147 }
1148
1149 add_interface_trigger()
1150 {
1151         local interface ignore
1152
1153         config_get interface "$1" interface
1154         config_get_bool ignore "$1" ignore 0
1155
1156         [ -n "$interface" ] && [ $ignore -eq 0 ] && procd_add_interface_trigger "interface.*" "$interface" /etc/init.d/dnsmasq reload
1157 }
1158
1159 service_triggers()
1160 {
1161         procd_add_reload_trigger "dhcp" "system"
1162
1163         config_load dhcp
1164         config_foreach add_interface_trigger dhcp
1165         config_foreach add_interface_trigger relay
1166 }
1167
1168 boot()
1169 {
1170         BOOT=1
1171         start "$@"
1172 }
1173
1174 start_service() {
1175         local instance="$1"
1176         local instance_found=0
1177         local first_instance=""
1178
1179         . /lib/functions/network.sh
1180
1181         config_cb() {
1182                 local type="$1"
1183                 local name="$2"
1184                 if [ "$type" = "dnsmasq" ]; then
1185                         if [ -n "$instance" ] && [ "$instance" = "$name" ]; then
1186                                 instance_found=1
1187                         fi
1188                         if [ -z "$DEFAULT_INSTANCE" ]; then
1189                                 local disabled
1190                                 config_get_bool disabled "$name" disabled 0
1191                                 if [ "$disabled" -eq 0 ]; then
1192                                         # First enabled section will be assigned default instance name.
1193                                         # Unnamed sections get precedence over named sections.
1194                                         if expr "$cfg" : 'cfg[0-9a-f]*$' >/dev/null = "9"; then # See uci_fixup_section.
1195                                                 DEFAULT_INSTANCE="$name" # Unnamed config section.
1196                                         elif [ -z "$first_instance" ]; then
1197                                                 first_instance="$name"
1198                                         fi
1199                                 fi
1200                         fi
1201                 fi
1202         }
1203
1204         DEFAULT_INSTANCE=""
1205         config_load dhcp
1206         if [ -z "$DEFAULT_INSTANCE" ]; then
1207                 DEFAULT_INSTANCE="$first_instance" # No unnamed config section was found.
1208         fi
1209
1210         if [ -n "$instance" ]; then
1211                 [ "$instance_found" -gt 0 ] || return
1212                 dnsmasq_start "$instance"
1213         else
1214                 config_foreach dnsmasq_start dnsmasq
1215         fi
1216 }
1217
1218 reload_service() {
1219         rc_procd start_service "$@"
1220         procd_send_signal dnsmasq "$@"
1221 }
1222
1223 stop_service() {
1224         local instance="$1"
1225         local instance_found=0
1226
1227         config_cb() {
1228                 local type="$1"
1229                 local name="$2"
1230                 if [ "$type" = "dnsmasq" ]; then
1231                         if [ -n "$instance" ] && [ "$instance" = "$name" ]; then
1232                                 instance_found=1
1233                         fi
1234                 fi
1235         }
1236
1237         config_load dhcp
1238
1239         if [ -n "$instance" ]; then
1240                 [ "$instance_found" -gt 0 ] || return
1241                 dnsmasq_stop "$instance"
1242         else
1243                 config_foreach dnsmasq_stop dnsmasq
1244         fi
1245 }