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

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