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