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