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 "$cfg" "tftp_root" "--tftp-root"
 157         append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
 158         append_parm "$cfg" "local_ttl" "--local-ttl"
 159         append_parm "$cfg" "pxe_prompt" "--pxe-prompt"
 160         config_list_foreach "$cfg" "pxe_service" append_pxe_service
 161         config_get DOMAIN "$cfg" domain
 162
 163         config_get_bool ADD_LOCAL_DOMAIN "$cfg" add_local_domain 1
 164         config_get_bool ADD_LOCAL_HOSTNAME "$cfg" add_local_hostname 1
 165
 166         config_get_bool readethers "$cfg" readethers
 167         [ "$readethers" = "1" -a \! -e "/etc/ethers" ] && touch /etc/ethers
 168
 169         config_get leasefile $cfg leasefile
 170         [ -n "$leasefile" -a \! -e "$leasefile" ] && touch "$leasefile"
 171         config_get_bool cachelocal "$cfg" cachelocal 1
 172
 173         config_get hostsfile "$cfg" dhcphostsfile
 174         [ -e "$hostsfile" ] && xappend "--dhcp-hostsfile=$hostsfile"
 175
 176         mkdir -p /tmp/hosts /tmp/dnsmasq.d
 177         xappend "--addn-hosts=/tmp/hosts"
 178         xappend "--conf-dir=/tmp/dnsmasq.d"
 179
 180         local rebind
 181         config_get_bool rebind "$cfg" rebind_protection 1
 182         [ $rebind -gt 0 ] && {
 183                 log_once \
 184                         "DNS rebinding protection is active," \
 185                         "will discard upstream RFC1918 responses!"
 186                 xappend "--stop-dns-rebind"
 187
 188                 local rebind_localhost
 189                 config_get_bool rebind_localhost "$cfg" rebind_localhost 0
 190                 [ $rebind_localhost -gt 0 ] && {
 191                         log_once "Allowing 127.0.0.0/8 responses"
 192                         xappend "--rebind-localhost-ok"
 193                 }
 194
 195                 append_rebind_domain() {
 196                         log_once "Allowing RFC1918 responses for domain $1"
 197                         xappend "--rebind-domain-ok=$1"
 198                 }
 199
 200                 config_list_foreach "$cfg" rebind_domain append_rebind_domain
 201         }
 202
 203         config_get_bool dnssec "$cfg" dnssec 0
 204         [ "$dnssec" -gt 0 ] && {
 205                 xappend "--conf-file=$TRUSTANCHORSFILE"
 206                 xappend "--dnssec"
 207                 append_bool "$cfg" dnsseccheckunsigned "--dnssec-check-unsigned"
 208         }
 209
 210         dhcp_option_add "$cfg" "" 0
 211
 212         xappend "--dhcp-broadcast=tag:needs-broadcast"
 213
 214         echo >> $CONFIGFILE
 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         local cfg="$1"
 251
 252         config_get networkid "$cfg" networkid
 253         [ -n "$networkid" ] || return 0
 254
 255         config_get circuitid "$cfg" circuitid
 256         [ -n "$circuitid" ] || return 0
 257
 258         xappend "--dhcp-circuitid=$networkid,$circuitid"
 259
 260         config_get_bool force "$cfg" force 0
 261
 262         dhcp_option_add "$cfg" "$networkid" "$force"
 263 }
 264
 265 dhcp_userclass_add() {
 266         local cfg="$1"
 267
 268         config_get networkid "$cfg" networkid
 269         [ -n "$networkid" ] || return 0
 270
 271         config_get userclass "$cfg" userclass
 272         [ -n "$userclass" ] || return 0
 273
 274         xappend "--dhcp-userclass=$networkid,$userclass"
 275
 276         config_get_bool force "$cfg" force 0
 277
 278         dhcp_option_add "$cfg" "$networkid" "$force"
 279 }
 280
 281 dhcp_vendorclass_add() {
 282         local cfg="$1"
 283
 284         config_get networkid "$cfg" networkid
 285         [ -n "$networkid" ] || return 0
 286
 287         config_get vendorclass "$cfg" vendorclass
 288         [ -n "$vendorclass" ] || return 0
 289
 290         xappend "--dhcp-vendorclass=$networkid,$vendorclass"
 291
 292         config_get_bool force "$cfg" force 0
 293
 294         dhcp_option_add "$cfg" "$networkid" "$force"
 295 }
 296
 297 dhcp_host_add() {
 298         local cfg="$1"
 299
 300         config_get_bool force "$cfg" force 0
 301
 302         config_get networkid "$cfg" networkid
 303         [ -n "$networkid" ] && dhcp_option_add "$cfg" "$networkid" "$force"
 304
 305         config_get name "$cfg" name
 306         config_get ip "$cfg" ip
 307         [ -n "$ip" -o -n "$name" ] || return 0
 308
 309         config_get_bool dns "$cfg" dns 0
 310         [ "$dns" = "1" -a -n "$ip" -a -n "$name" ] && {
 311                 echo "$ip $name${DOMAIN:+.$DOMAIN}" >> $HOSTFILE
 312         }
 313
 314         config_get mac "$cfg" mac
 315         if [ -n "$mac" ]; then
 316                 # --dhcp-host=00:20:e0:3b:13:af,192.168.0.199,lap
 317                 macs=""
 318                 for m in $mac; do append macs "$m" ","; done
 319         else
 320                 # --dhcp-host=lap,192.168.0.199
 321                 [ -n "$name" ] || return 0
 322                 macs="$name"
 323                 name=""
 324         fi
 325
 326         config_get tag "$cfg" tag
 327
 328         config_get_bool broadcast "$cfg" broadcast 0
 329         [ "$broadcast" = "0" ] && broadcast=
 330
 331         xappend "--dhcp-host=$macs${networkid:+,net:$networkid}${broadcast:+,set:needs-broadcast}${tag:+,set:$tag}${ip:+,$ip}${name:+,$name}"
 332 }
 333
 334 dhcp_tag_add() {
 335         local cfg="$1"
 336
 337         tag="$cfg"
 338
 339         [ -n "$tag" ] || return 0
 340
 341         config_get_bool force "$cfg" force 0
 342         [ "$force" = "0" ] && force=
 343
 344         config_get option "$cfg" dhcp_option
 345         for o in $option; do
 346                 xappend "--dhcp-option${force:+-force}=tag:$tag,$o"
 347         done
 348 }
 349
 350 dhcp_mac_add() {
 351         local cfg="$1"
 352
 353         config_get networkid "$cfg" networkid
 354         [ -n "$networkid" ] || return 0
 355
 356         config_get mac "$cfg" mac
 357         [ -n "$mac" ] || return 0
 358
 359         xappend "--dhcp-mac=$networkid,$mac"
 360
 361         dhcp_option_add "$cfg" "$networkid"
 362 }
 363
 364 dhcp_boot_add() {
 365         local cfg="$1"
 366
 367         config_get networkid "$cfg" networkid
 368
 369         config_get filename "$cfg" filename
 370         [ -n "$filename" ] || return 0
 371
 372         config_get servername "$cfg" servername
 373         config_get serveraddress "$cfg" serveraddress
 374
 375         [ -n "$serveraddress" -a ! -n "$servername" ] && return 0
 376
 377         xappend "--dhcp-boot=${networkid:+net:$networkid,}${filename}${servername:+,$servername}${serveraddress:+,$serveraddress}"
 378
 379         config_get_bool force "$cfg" force 0
 380
 381         dhcp_option_add "$cfg" "$networkid" "$force"
 382 }
 383
 384
 385 dhcp_add() {
 386         local cfg="$1"
 387         config_get net "$cfg" interface
 388         [ -n "$net" ] || return 0
 389
 390         config_get dhcpv4 "$cfg" dhcpv4
 391         [ "$dhcpv4" != "disabled" ] || return 0
 392
 393         config_get networkid "$cfg" networkid
 394         [ -n "$networkid" ] || networkid="$net"
 395
 396         network_get_subnet subnet "$net" || return 0
 397         network_get_device ifname "$net" || return 0
 398         network_get_protocol proto "$net" || return 0
 399
 400         [ "$cachelocal" = "0" ] && network_get_dnsserver dnsserver "$net" && {
 401                 DNS_SERVERS="$DNS_SERVERS $dnsserver"
 402         }
 403
 404         append_bool "$cfg" ignore "--no-dhcp-interface=$ifname" && return 0
 405
 406         # Do not support non-static interfaces for now
 407         [ static = "$proto" ] || return 0
 408
 409         # Override interface netmask with dhcp config if applicable
 410         config_get netmask "$cfg" netmask "${subnet##*/}"
 411
 412         #check for an already active dhcp server on the interface, unless 'force' is set
 413         config_get_bool force "$cfg" force 0
 414         [ $force -gt 0 ] || dhcp_check "$ifname" || return 0
 415
 416         config_get start "$cfg" start
 417         config_get limit "$cfg" limit
 418         config_get leasetime "$cfg" leasetime
 419         config_get options "$cfg" options
 420         config_get_bool dynamicdhcp "$cfg" dynamicdhcp 1
 421
 422         leasetime="${leasetime:-12h}"
 423         start="$(dhcp_calc "${start:-100}")"
 424         limit="${limit:-150}"
 425         [ "$limit" -gt 0 ] && limit=$((limit-1))
 426         eval "$(ipcalc.sh "${subnet%%/*}" $netmask $start $limit)"
 427         if [ "$dynamicdhcp" = "0" ]; then END="static"; fi
 428         xappend "--dhcp-range=$networkid,$START,$END,$NETMASK,$leasetime${options:+ $options}"
 429
 430         dhcp_option_add "$cfg" "$networkid"
 431 }
 432
 433 dhcp_option_add() {
 434         local cfg="$1"
 435         local networkid="$2"
 436         local force="$3"
 437
 438         [ "$force" = "0" ] && force=
 439
 440         config_get dhcp_option "$cfg" dhcp_option
 441         for o in $dhcp_option; do
 442                 xappend "--dhcp-option${force:+-force}=${networkid:+$networkid,}$o"
 443         done
 444
 445 }
 446
 447 dhcp_domain_add() {
 448         local cfg="$1"
 449         local ip name names record
 450
 451         config_get names "$cfg" name "$2"
 452         [ -n "$names" ] || return 0
 453
 454         config_get ip "$cfg" ip "$3"
 455         [ -n "$ip" ] || return 0
 456
 457         for name in $names; do
 458                 record="${record:+$record }$name"
 459         done
 460
 461         echo "$ip $record" >> $HOSTFILE
 462 }
 463
 464 dhcp_srv_add() {
 465         local cfg="$1"
 466
 467         config_get srv "$cfg" srv
 468         [ -n "$srv" ] || return 0
 469
 470         config_get target "$cfg" target
 471         [ -n "$target" ] || return 0
 472
 473         config_get port "$cfg" port
 474         [ -n "$port" ] || return 0
 475
 476         config_get class "$cfg" class
 477         config_get weight "$cfg" weight
 478
 479         local service="$srv,$target,$port${class:+,$class${weight:+,$weight}}"
 480
 481         xappend "--srv-host=$service"
 482 }
 483
 484 dhcp_mx_add() {
 485         local cfg="$1"
 486         local domain relay pref
 487
 488         config_get domain "$cfg" domain
 489         [ -n "$domain" ] || return 0
 490
 491         config_get relay "$cfg" relay
 492         [ -n "$relay" ] || return 0
 493
 494         config_get pref "$cfg" pref 0
 495
 496         local service="$domain,$relay,$pref"
 497
 498         xappend "--mx-host=$service"
 499 }
 500
 501 dhcp_cname_add() {
 502         local cfg="$1"
 503         local cname target
 504
 505         config_get cname "$cfg" cname
 506         [ -n "$cname" ] || return 0
 507
 508         config_get target "$cfg" target
 509         [ -n "$target" ] || return 0
 510
 511         xappend "--cname=${cname},${target}"
 512 }
 513
 514 dhcp_hostrecord_add() {
 515         local cfg="$1"
 516         local names addresses record val
 517
 518         config_get names "$cfg" name "$2"
 519         if [ -z "$names" ]; then
 520                 return 0
 521         fi
 522
 523         config_get addresses "$cfg" ip "$3"
 524         if [ -z "$addresses" ]; then
 525                 return 0
 526         fi
 527
 528         for val in $names $addresses; do
 529                 record="${record:+$record,}$val"
 530         done
 531
 532         xappend "--host-record=$record"
 533 }
 534
 535 service_triggers()
 536 {
 537         procd_add_reload_trigger "dhcp"
 538 }
 539
 540 boot() {
 541         # Will be launched through hotplug
 542         return 0
 543 }
 544
 545 start_service() {
 546         include /lib/functions
 547
 548         config_load dhcp
 549
 550         procd_open_instance
 551         procd_set_param command $PROG -C $CONFIGFILE -k -x /var/run/dnsmasq/dnsmasq.pid
 552         procd_set_param file $CONFIGFILE
 553         procd_set_param respawn
 554
 555         procd_add_jail dnsmasq ubus log
 556         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
 557         procd_add_jail_mount_rw /var/run/dnsmasq/ /tmp/dhcp.leases
 558
 559         procd_close_instance
 560
 561         # before we can call xappend
 562         mkdir -p /var/run/dnsmasq/
 563         mkdir -p $(dirname $CONFIGFILE)
 564         mkdir -p /var/lib/misc
 565         touch /tmp/dhcp.leases
 566
 567
 568         echo "# auto-generated config file from /etc/config/dhcp" > $CONFIGFILE
 569         echo "# auto-generated config file from /etc/config/dhcp" > $HOSTFILE
 570
 571         # if we did this last, we could override auto-generated config
 572         [ -f /etc/dnsmasq.conf ] && {
 573                 xappend "--conf-file=/etc/dnsmasq.conf"
 574         }
 575
 576         args=""
 577         config_foreach dnsmasq dnsmasq
 578         config_foreach dhcp_host_add host
 579         echo >> $CONFIGFILE
 580         config_foreach dhcp_boot_add boot
 581         config_foreach dhcp_mac_add mac
 582         config_foreach dhcp_tag_add tag
 583         config_foreach dhcp_vendorclass_add vendorclass
 584         config_foreach dhcp_userclass_add userclass
 585         config_foreach dhcp_circuitid_add circuitid
 586         config_foreach dhcp_remoteid_add remoteid
 587         config_foreach dhcp_subscrid_add subscrid
 588         config_foreach dhcp_domain_add domain
 589         config_foreach dhcp_hostrecord_add hostrecord
 590
 591         # add own hostname
 592         local lanaddr
 593         [ $ADD_LOCAL_HOSTNAME -eq 1 ] && network_get_ipaddr lanaddr "lan" && {
 594                 local hostname="$(uci_get system @system[0] hostname OpenWrt)"
 595                 dhcp_domain_add "" "$hostname" "$lanaddr"
 596         }
 597
 598         echo >> $CONFIGFILE
 599         config_foreach dhcp_srv_add srvhost
 600         config_foreach dhcp_mx_add mxhost
 601         echo >> $CONFIGFILE
 602
 603         config_get odhcpd_is_active odhcpd maindhcp
 604         if [ "$odhcpd_is_active" != "1" ]; then
 605                 config_foreach dhcp_add dhcp
 606         fi
 607
 608         echo >> $CONFIGFILE
 609         config_foreach dhcp_cname_add cname
 610         echo >> $CONFIGFILE
 611
 612         rm -f /tmp/resolv.conf
 613         [ $ADD_LOCAL_DOMAIN -eq 1 ] && [ -n "$DOMAIN" ] && {
 614                 echo "search $DOMAIN" >> /tmp/resolv.conf
 615         }
 616         DNS_SERVERS="$DNS_SERVERS 127.0.0.1"
 617         for DNS_SERVER in $DNS_SERVERS ; do
 618                 echo "nameserver $DNS_SERVER" >> /tmp/resolv.conf
 619         done
 620 }
 621
 622 reload_service() {
 623         rc_procd start_service "$@"
 624         return 0
 625 }
 626
 627 stop_service() {
 628         [ -f /tmp/resolv.conf ] && {
 629                 rm -f /tmp/resolv.conf
 630                 ln -s /tmp/resolv.conf.auto /tmp/resolv.conf
 631         }
 632         rm -f /var/run/dnsmasq.*.dhcp
 633 }