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