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