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