libs/sys/luasrc/sys.lua

   1 --[[
   2 LuCI - System library
   3
   4 Description:
   5 Utilities for interaction with the Linux system
   6
   7 FileId:
   8 $Id$
   9
  10 License:
  11 Copyright 2008 Steven Barth <steven@midlink.org>
  12
  13 Licensed under the Apache License, Version 2.0 (the "License");
  14 you may not use this file except in compliance with the License.
  15 You may obtain a copy of the License at
  16
  17         http://www.apache.org/licenses/LICENSE-2.0
  18
  19 Unless required by applicable law or agreed to in writing, software
  20 distributed under the License is distributed on an "AS IS" BASIS,
  21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  22 See the License for the specific language governing permissions and
  23 limitations under the License.
  24
  25 ]]--
  26
  27
  28 local io     = require "io"
  29 local os     = require "os"
  30 local table  = require "table"
  31 local nixio  = require "nixio"
  32 local fs     = require "nixio.fs"
  33 local uci    = require "luci.model.uci"
  34
  35 local luci  = {}
  36 luci.util   = require "luci.util"
  37 luci.ip     = require "luci.ip"
  38
  39 local tonumber, ipairs, pairs, pcall, type, next, setmetatable, require =
  40         tonumber, ipairs, pairs, pcall, type, next, setmetatable, require
  41
  42
  43 --- LuCI Linux and POSIX system utilities.
  44 module "luci.sys"
  45
  46 --- Execute a given shell command and return the error code
  47 -- @class               function
  48 -- @name                call
  49 -- @param               ...             Command to call
  50 -- @return              Error code of the command
  51 function call(...)
  52         return os.execute(...) / 256
  53 end
  54
  55 --- Execute a given shell command and capture its standard output
  56 -- @class               function
  57 -- @name                exec
  58 -- @param command       Command to call
  59 -- @return                      String containg the return the output of the command
  60 exec = luci.util.exec
  61
  62 --- Retrieve information about currently mounted file systems.
  63 -- @return      Table containing mount information
  64 function mounts()
  65         local data = {}
  66         local k = {"fs", "blocks", "used", "available", "percent", "mountpoint"}
  67         local ps = luci.util.execi("df")
  68
  69         if not ps then
  70                 return
  71         else
  72                 ps()
  73         end
  74
  75         for line in ps do
  76                 local row = {}
  77
  78                 local j = 1
  79                 for value in line:gmatch("[^%s]+") do
  80                         row[k[j]] = value
  81                         j = j + 1
  82                 end
  83
  84                 if row[k[1]] then
  85
  86                         -- this is a rather ugly workaround to cope with wrapped lines in
  87                         -- the df output:
  88                         --
  89                         --      /dev/scsi/host0/bus0/target0/lun0/part3
  90                         --                   114382024  93566472  15005244  86% /mnt/usb
  91                         --
  92
  93                         if not row[k[2]] then
  94                                 j = 2
  95                                 line = ps()
  96                                 for value in line:gmatch("[^%s]+") do
  97                                         row[k[j]] = value
  98                                         j = j + 1
  99                                 end
 100                         end
 101
 102                         table.insert(data, row)
 103                 end
 104         end
 105
 106         return data
 107 end
 108
 109 --- Retrieve environment variables. If no variable is given then a table
 110 -- containing the whole environment is returned otherwise this function returns
 111 -- the corresponding string value for the given name or nil if no such variable
 112 -- exists.
 113 -- @class               function
 114 -- @name                getenv
 115 -- @param var   Name of the environment variable to retrieve (optional)
 116 -- @return              String containg the value of the specified variable
 117 -- @return              Table containing all variables if no variable name is given
 118 getenv = nixio.getenv
 119
 120 --- Get or set the current hostname.
 121 -- @param               String containing a new hostname to set (optional)
 122 -- @return              String containing the system hostname
 123 function hostname(newname)
 124         if type(newname) == "string" and #newname > 0 then
 125                 fs.writefile( "/proc/sys/kernel/hostname", newname )
 126                 return newname
 127         else
 128                 return nixio.uname().nodename
 129         end
 130 end
 131
 132 --- Returns the contents of a documented referred by an URL.
 133 -- @param url    The URL to retrieve
 134 -- @param stream Return a stream instead of a buffer
 135 -- @param target Directly write to target file name
 136 -- @return              String containing the contents of given the URL
 137 function httpget(url, stream, target)
 138         if not target then
 139                 local source = stream and io.popen or luci.util.exec
 140                 return source("wget -qO- '"..url:gsub("'", "").."'")
 141         else
 142                 return os.execute("wget -qO '%s' '%s'" %
 143                         {target:gsub("'", ""), url:gsub("'", "")})
 144         end
 145 end
 146
 147 --- Returns the system load average values.
 148 -- @return      String containing the average load value 1 minute ago
 149 -- @return      String containing the average load value 5 minutes ago
 150 -- @return      String containing the average load value 15 minutes ago
 151 function loadavg()
 152         local info = nixio.sysinfo()
 153         return info.loads[1], info.loads[2], info.loads[3]
 154 end
 155
 156 --- Initiate a system reboot.
 157 -- @return      Return value of os.execute()
 158 function reboot()
 159         return os.execute("reboot >/dev/null 2>&1")
 160 end
 161
 162 --- Returns the system type, cpu name and installed physical memory.
 163 -- @return      String containing the system or platform identifier
 164 -- @return      String containing hardware model information
 165 -- @return      String containing the total memory amount in kB
 166 -- @return      String containing the memory used for caching in kB
 167 -- @return      String containing the memory used for buffering in kB
 168 -- @return      String containing the free memory amount in kB
 169 function sysinfo()
 170         local cpuinfo = fs.readfile("/proc/cpuinfo")
 171         local meminfo = fs.readfile("/proc/meminfo")
 172
 173         local system = cpuinfo:match("system typ.-:%s*([^\n]+)")
 174         local model = ""
 175         local memtotal = tonumber(meminfo:match("MemTotal:%s*(%d+)"))
 176         local memcached = tonumber(meminfo:match("\nCached:%s*(%d+)"))
 177         local memfree = tonumber(meminfo:match("MemFree:%s*(%d+)"))
 178         local membuffers = tonumber(meminfo:match("Buffers:%s*(%d+)"))
 179
 180         if not system then
 181                 system = nixio.uname().machine
 182                 model = cpuinfo:match("model name.-:%s*([^\n]+)")
 183                 if not model then
 184                         model = cpuinfo:match("Processor.-:%s*([^\n]+)")
 185                 end
 186         else
 187                 model = cpuinfo:match("cpu model.-:%s*([^\n]+)")
 188         end
 189
 190         return system, model, memtotal, memcached, membuffers, memfree
 191 end
 192
 193 --- Retrieves the output of the "logread" command.
 194 -- @return      String containing the current log buffer
 195 function syslog()
 196         return luci.util.exec("logread")
 197 end
 198
 199 --- Retrieves the output of the "dmesg" command.
 200 -- @return      String containing the current log buffer
 201 function dmesg()
 202         return luci.util.exec("dmesg")
 203 end
 204
 205 --- Generates a random id with specified length.
 206 -- @param bytes Number of bytes for the unique id
 207 -- @return              String containing hex encoded id
 208 function uniqueid(bytes)
 209         local rand = fs.readfile("/dev/urandom", bytes)
 210         return rand and nixio.bin.hexlify(rand)
 211 end
 212
 213 --- Returns the current system uptime stats.
 214 -- @return      String containing total uptime in seconds
 215 function uptime()
 216         return nixio.sysinfo().uptime
 217 end
 218
 219
 220 --- LuCI system utilities / network related functions.
 221 -- @class       module
 222 -- @name        luci.sys.net
 223 net = {}
 224
 225 --- Returns the current arp-table entries as two-dimensional table.
 226 -- @return      Table of table containing the current arp entries.
 227 --                      The following fields are defined for arp entry objects:
 228 --                      { "IP address", "HW address", "HW type", "Flags", "Mask", "Device" }
 229 function net.arptable(callback)
 230         return _parse_delimited_table(io.lines("/proc/net/arp"), "%s%s+", callback)
 231 end
 232
 233 --- Returns conntrack information
 234 -- @return      Table with the currently tracked IP connections
 235 function net.conntrack(callback)
 236         local connt = {}
 237         if fs.access("/proc/net/nf_conntrack", "r") then
 238                 for line in io.lines("/proc/net/nf_conntrack") do
 239                         line = line:match "^(.-( [^ =]+=).-)%2"
 240                         local entry, flags = _parse_mixed_record(line, " +")
 241                         entry.layer3 = flags[1]
 242                         entry.layer4 = flags[3]
 243                         for i=1, #entry do
 244                                 entry[i] = nil
 245                         end
 246
 247                         if callback then
 248                                 callback(entry)
 249                         else
 250                                 connt[#connt+1] = entry
 251                         end
 252                 end
 253         elseif fs.access("/proc/net/ip_conntrack", "r") then
 254                 for line in io.lines("/proc/net/ip_conntrack") do
 255                         line = line:match "^(.-( [^ =]+=).-)%2"
 256                         local entry, flags = _parse_mixed_record(line, " +")
 257                         entry.layer3 = "ipv4"
 258                         entry.layer4 = flags[1]
 259                         for i=1, #entry do
 260                                 entry[i] = nil
 261                         end
 262
 263                         if callback then
 264                                 callback(entry)
 265                         else
 266                                 connt[#connt+1] = entry
 267                         end
 268                 end
 269         else
 270                 return nil
 271         end
 272         return connt
 273 end
 274
 275 --- Determine the current IPv4 default route. If multiple default routes exist,
 276 -- return the one with the lowest metric.
 277 -- @return      Table with the properties of the current default route.
 278 --                      The following fields are defined:
 279 --                      { "dest", "gateway", "metric", "refcount", "usecount", "irtt",
 280 --                        "flags", "device" }
 281 function net.defaultroute()
 282         local route
 283
 284         net.routes(function(rt)
 285                 if rt.dest:prefix() == 0 and (not route or route.metric > rt.metric) then
 286                         route = rt
 287                 end
 288         end)
 289
 290         return route
 291 end
 292
 293 --- Determine the current IPv6 default route. If multiple default routes exist,
 294 -- return the one with the lowest metric.
 295 -- @return      Table with the properties of the current default route.
 296 --                      The following fields are defined:
 297 --                      { "source", "dest", "nexthop", "metric", "refcount", "usecount",
 298 --                        "flags", "device" }
 299 function net.defaultroute6()
 300         local route
 301
 302         net.routes6(function(rt)
 303                 if rt.dest:prefix() == 0 and (not route or route.metric > rt.metric) then
 304                         route = rt
 305                 end
 306         end)
 307
 308         return route
 309 end
 310
 311 --- Determine the names of available network interfaces.
 312 -- @return      Table containing all current interface names
 313 function net.devices()
 314         local devs = {}
 315         for k, v in ipairs(nixio.getifaddrs()) do
 316                 if v.family == "packet" then
 317                         devs[#devs+1] = v.name
 318                 end
 319         end
 320         return devs
 321 end
 322
 323
 324 --- Return information about available network interfaces.
 325 -- @return      Table containing all current interface names and their information
 326 function net.deviceinfo()
 327         local devs = {}
 328         for k, v in ipairs(nixio.getifaddrs()) do
 329                 if v.family == "packet" then
 330                         local d = v.data
 331                         d[1] = d.rx_bytes
 332                         d[2] = d.rx_packets
 333                         d[3] = d.rx_errors
 334                         d[4] = d.rx_dropped
 335                         d[5] = 0
 336                         d[6] = 0
 337                         d[7] = 0
 338                         d[8] = d.multicast
 339                         d[9] = d.tx_bytes
 340                         d[10] = d.tx_packets
 341                         d[11] = d.tx_errors
 342                         d[12] = d.tx_dropped
 343                         d[13] = 0
 344                         d[14] = d.collisions
 345                         d[15] = 0
 346                         d[16] = 0
 347                         devs[v.name] = d
 348                 end
 349         end
 350         return devs
 351 end
 352
 353
 354 -- Determine the MAC address belonging to the given IP address.
 355 -- @param ip    IPv4 address
 356 -- @return              String containing the MAC address or nil if it cannot be found
 357 function net.ip4mac(ip)
 358         local mac = nil
 359         net.arptable(function(e)
 360                 if e["IP address"] == ip then
 361                         mac = e["HW address"]
 362                 end
 363         end)
 364         return mac
 365 end
 366
 367 --- Returns the current kernel routing table entries.
 368 -- @return      Table of tables with properties of the corresponding routes.
 369 --                      The following fields are defined for route entry tables:
 370 --                      { "dest", "gateway", "metric", "refcount", "usecount", "irtt",
 371 --                        "flags", "device" }
 372 function net.routes(callback)
 373         local routes = { }
 374
 375         for line in io.lines("/proc/net/route") do
 376
 377                 local dev, dst_ip, gateway, flags, refcnt, usecnt, metric,
 378                           dst_mask, mtu, win, irtt = line:match(
 379                         "([^%s]+)\t([A-F0-9]+)\t([A-F0-9]+)\t([A-F0-9]+)\t" ..
 380                         "(%d+)\t(%d+)\t(%d+)\t([A-F0-9]+)\t(%d+)\t(%d+)\t(%d+)"
 381                 )
 382
 383                 if dev then
 384                         gateway  = luci.ip.Hex( gateway,  32, luci.ip.FAMILY_INET4 )
 385                         dst_mask = luci.ip.Hex( dst_mask, 32, luci.ip.FAMILY_INET4 )
 386                         dst_ip   = luci.ip.Hex(
 387                                 dst_ip, dst_mask:prefix(dst_mask), luci.ip.FAMILY_INET4
 388                         )
 389
 390                         local rt = {
 391                                 dest     = dst_ip,
 392                                 gateway  = gateway,
 393                                 metric   = tonumber(metric),
 394                                 refcount = tonumber(refcnt),
 395                                 usecount = tonumber(usecnt),
 396                                 mtu      = tonumber(mtu),
 397                                 window   = tonumber(window),
 398                                 irtt     = tonumber(irtt),
 399                                 flags    = tonumber(flags, 16),
 400                                 device   = dev
 401                         }
 402
 403                         if callback then
 404                                 callback(rt)
 405                         else
 406                                 routes[#routes+1] = rt
 407                         end
 408                 end
 409         end
 410
 411         return routes
 412 end
 413
 414 --- Returns the current ipv6 kernel routing table entries.
 415 -- @return      Table of tables with properties of the corresponding routes.
 416 --                      The following fields are defined for route entry tables:
 417 --                      { "source", "dest", "nexthop", "metric", "refcount", "usecount",
 418 --                        "flags", "device" }
 419 function net.routes6(callback)
 420         if fs.access("/proc/net/ipv6_route", "r") then
 421                 local routes = { }
 422
 423                 for line in io.lines("/proc/net/ipv6_route") do
 424
 425                         local dst_ip, dst_prefix, src_ip, src_prefix, nexthop,
 426                                   metric, refcnt, usecnt, flags, dev = line:match(
 427                                 "([a-f0-9]+) ([a-f0-9]+) " ..
 428                                 "([a-f0-9]+) ([a-f0-9]+) " ..
 429                                 "([a-f0-9]+) ([a-f0-9]+) " ..
 430                                 "([a-f0-9]+) ([a-f0-9]+) " ..
 431                                 "([a-f0-9]+) +([^%s]+)"
 432                         )
 433
 434                         src_ip = luci.ip.Hex(
 435                                 src_ip, tonumber(src_prefix, 16), luci.ip.FAMILY_INET6, false
 436                         )
 437
 438                         dst_ip = luci.ip.Hex(
 439                                 dst_ip, tonumber(dst_prefix, 16), luci.ip.FAMILY_INET6, false
 440                         )
 441
 442                         nexthop = luci.ip.Hex( nexthop, 128, luci.ip.FAMILY_INET6, false )
 443
 444                         local rt = {
 445                                 source   = src_ip,
 446                                 dest     = dst_ip,
 447                                 nexthop  = nexthop,
 448                                 metric   = tonumber(metric, 16),
 449                                 refcount = tonumber(refcnt, 16),
 450                                 usecount = tonumber(usecnt, 16),
 451                                 flags    = tonumber(flags, 16),
 452                                 device   = dev,
 453
 454                                 -- lua number is too small for storing the metric
 455                                 -- add a metric_raw field with the original content
 456                                 metric_raw = metric
 457                         }
 458
 459                         if callback then
 460                                 callback(rt)
 461                         else
 462                                 routes[#routes+1] = rt
 463                         end
 464                 end
 465
 466                 return routes
 467         end
 468 end
 469
 470 --- Tests whether the given host responds to ping probes.
 471 -- @param host  String containing a hostname or IPv4 address
 472 -- @return              Number containing 0 on success and >= 1 on error
 473 function net.pingtest(host)
 474         return os.execute("ping -c1 '"..host:gsub("'", '').."' >/dev/null 2>&1")
 475 end
 476
 477
 478 --- LuCI system utilities / process related functions.
 479 -- @class       module
 480 -- @name        luci.sys.process
 481 process = {}
 482
 483 --- Get the current process id.
 484 -- @class function
 485 -- @name  process.info
 486 -- @return      Number containing the current pid
 487 function process.info(key)
 488         local s = {uid = nixio.getuid(), gid = nixio.getgid()}
 489         return not key and s or s[key]
 490 end
 491
 492 --- Retrieve information about currently running processes.
 493 -- @return      Table containing process information
 494 function process.list()
 495         local data = {}
 496         local k
 497         local ps = luci.util.execi("top -bn1")
 498
 499         if not ps then
 500                 return
 501         end
 502
 503         while true do
 504                 local line = ps()
 505                 if not line then
 506                         return
 507                 end
 508
 509                 k = luci.util.split(luci.util.trim(line), "%s+", nil, true)
 510                 if k[1] == "PID" then
 511                         break
 512                 end
 513         end
 514
 515         for line in ps do
 516                 local row = {}
 517
 518                 line = luci.util.trim(line)
 519                 for i, value in ipairs(luci.util.split(line, "%s+", #k-1, true)) do
 520                         row[k[i]] = value
 521                 end
 522
 523                 local pid = tonumber(row[k[1]])
 524                 if pid then
 525                         data[pid] = row
 526                 end
 527         end
 528
 529         return data
 530 end
 531
 532 --- Set the gid of a process identified by given pid.
 533 -- @param gid   Number containing the Unix group id
 534 -- @return              Boolean indicating successful operation
 535 -- @return              String containing the error message if failed
 536 -- @return              Number containing the error code if failed
 537 function process.setgroup(gid)
 538         return nixio.setgid(gid)
 539 end
 540
 541 --- Set the uid of a process identified by given pid.
 542 -- @param uid   Number containing the Unix user id
 543 -- @return              Boolean indicating successful operation
 544 -- @return              String containing the error message if failed
 545 -- @return              Number containing the error code if failed
 546 function process.setuser(uid)
 547         return nixio.setuid(uid)
 548 end
 549
 550 --- Send a signal to a process identified by given pid.
 551 -- @class function
 552 -- @name  process.signal
 553 -- @param pid   Number containing the process id
 554 -- @param sig   Signal to send (default: 15 [SIGTERM])
 555 -- @return              Boolean indicating successful operation
 556 -- @return              Number containing the error code if failed
 557 process.signal = nixio.kill
 558
 559
 560 --- LuCI system utilities / user related functions.
 561 -- @class       module
 562 -- @name        luci.sys.user
 563 user = {}
 564
 565 --- Retrieve user informations for given uid.
 566 -- @class               function
 567 -- @name                getuser
 568 -- @param uid   Number containing the Unix user id
 569 -- @return              Table containing the following fields:
 570 --                              { "uid", "gid", "name", "passwd", "dir", "shell", "gecos" }
 571 user.getuser = nixio.getpw
 572
 573 --- Retrieve the current user password hash.
 574 -- @param username      String containing the username to retrieve the password for
 575 -- @return                      String containing the hash or nil if no password is set.
 576 function user.getpasswd(username)
 577         local pwe = nixio.getsp and nixio.getsp(username) or nixio.getpw(username)
 578         local pwh = pwe and (pwe.pwdp or pwe.passwd)
 579         if not pwh or #pwh < 1 or pwh == "!" or pwh == "x" then
 580                 return nil
 581         else
 582                 return pwh
 583         end
 584 end
 585
 586 --- Test whether given string matches the password of a given system user.
 587 -- @param username      String containing the Unix user name
 588 -- @param pass          String containing the password to compare
 589 -- @return                      Boolean indicating wheather the passwords are equal
 590 function user.checkpasswd(username, pass)
 591         local pwh = user.getpasswd(username)
 592         if pwh and nixio.crypt(pass, pwh) ~= pwh then
 593                 return false
 594         else
 595                 return true
 596         end
 597 end
 598
 599 --- Change the password of given user.
 600 -- @param username      String containing the Unix user name
 601 -- @param password      String containing the password to compare
 602 -- @return                      Number containing 0 on success and >= 1 on error
 603 function user.setpasswd(username, password)
 604         if password then
 605                 password = password:gsub("'", "")
 606         end
 607
 608         if username then
 609                 username = username:gsub("'", "")
 610         end
 611
 612         local cmd = "(echo '"..password.."';sleep 1;echo '"..password.."')|"
 613         cmd = cmd .. "passwd '"..username.."' >/dev/null 2>&1"
 614         return os.execute(cmd)
 615 end
 616
 617
 618 --- LuCI system utilities / wifi related functions.
 619 -- @class       module
 620 -- @name        luci.sys.wifi
 621 wifi = {}
 622
 623 --- Get wireless information for given interface.
 624 -- @param ifname        String containing the interface name
 625 -- @return              A wrapped iwinfo object instance
 626 function wifi.getiwinfo(ifname)
 627         local iwinfo = require "iwinfo"
 628
 629         if ifname then
 630                 local c = 0
 631                 local u = uci.cursor_state()
 632                 local d, n = ifname:match("^(%w+)%.network(%d+)")
 633                 if d and n then
 634                         n = tonumber(n)
 635                         u:foreach("wireless", "wifi-iface",
 636                                 function(s)
 637                                         if s.device == d then
 638                                                 c = c + 1
 639                                                 if c == n then
 640                                                         ifname = s.ifname or s.device
 641                                                         return false
 642                                                 end
 643                                         end
 644                                 end)
 645                 elseif u:get("wireless", ifname) == "wifi-device" then
 646                         u:foreach("wireless", "wifi-iface",
 647                                 function(s)
 648                                         if s.device == ifname and s.ifname then
 649                                                 ifname = s.ifname
 650                                                 return false
 651                                         end
 652                                 end)
 653                 end
 654
 655                 local t = iwinfo.type(ifname)
 656                 if t then
 657                         local x = iwinfo[t]
 658                         return setmetatable({}, {
 659                                 __index = function(t, k)
 660                                         if k == "ifname" then
 661                                                 return ifname
 662                                         elseif x[k] then
 663                                                 return x[k](ifname)
 664                                         end
 665                                 end
 666                         })
 667                 end
 668         end
 669 end
 670
 671 --- Get iwconfig output for all wireless devices.
 672 -- @return      Table of tables containing the iwconfing output for each wifi device
 673 function wifi.getiwconfig()
 674         local cnt = luci.util.exec("PATH=/sbin:/usr/sbin iwconfig 2>/dev/null")
 675         local iwc = {}
 676
 677         for i, l in pairs(luci.util.split(luci.util.trim(cnt), "\n\n")) do
 678                 local k = l:match("^(.-) ")
 679                 l = l:gsub("^(.-) +", "", 1)
 680                 if k then
 681                         local entry, flags = _parse_mixed_record(l)
 682                         if entry then
 683                                 entry.flags = flags
 684                         end
 685                         iwc[k] = entry
 686                 end
 687         end
 688
 689         return iwc
 690 end
 691
 692 --- Get iwlist scan output from all wireless devices.
 693 -- @return      Table of tables contaiing all scan results
 694 function wifi.iwscan(iface)
 695         local siface = iface or ""
 696         local cnt = luci.util.exec("iwlist "..siface.." scan 2>/dev/null")
 697         local iws = {}
 698
 699         for i, l in pairs(luci.util.split(luci.util.trim(cnt), "\n\n")) do
 700                 local k = l:match("^(.-) ")
 701                 l = l:gsub("^[^\n]+", "", 1)
 702                 l = luci.util.trim(l)
 703                 if k then
 704                         iws[k] = {}
 705                         for j, c in pairs(luci.util.split(l, "\n          Cell")) do
 706                                 c = c:gsub("^(.-)- ", "", 1)
 707                                 c = luci.util.split(c, "\n", 7)
 708                                 c = table.concat(c, "\n", 1)
 709                                 local entry, flags = _parse_mixed_record(c)
 710                                 if entry then
 711                                         entry.flags = flags
 712                                 end
 713                                 table.insert(iws[k], entry)
 714                         end
 715                 end
 716         end
 717
 718         return iface and (iws[iface] or {}) or iws
 719 end
 720
 721 --- Get available channels from given wireless iface.
 722 -- @param iface Wireless interface (optional)
 723 -- @return              Table of available channels
 724 function wifi.channels(iface)
 725         local t = iwinfo.type(iface or "")
 726         local cns
 727         if iface and t and iwinfo[t] then
 728                 cns = iwinfo[t].freqlist(iface)
 729         end
 730
 731         if not cns or #cns == 0 then
 732                 cns = {
 733                         {channel =  1, mhz = 2412},
 734                         {channel =  2, mhz = 2417},
 735                         {channel =  3, mhz = 2422},
 736                         {channel =  4, mhz = 2427},
 737                         {channel =  5, mhz = 2432},
 738                         {channel =  6, mhz = 2437},
 739                         {channel =  7, mhz = 2442},
 740                         {channel =  8, mhz = 2447},
 741                         {channel =  9, mhz = 2452},
 742                         {channel = 10, mhz = 2457},
 743                         {channel = 11, mhz = 2462}
 744                 }
 745         end
 746
 747         return cns
 748 end
 749
 750
 751 --- LuCI system utilities / init related functions.
 752 -- @class       module
 753 -- @name        luci.sys.init
 754 init = {}
 755 init.dir = "/etc/init.d/"
 756
 757 --- Get the names of all installed init scripts
 758 -- @return      Table containing the names of all inistalled init scripts
 759 function init.names()
 760         local names = { }
 761         for name in fs.glob(init.dir.."*") do
 762                 names[#names+1] = fs.basename(name)
 763         end
 764         return names
 765 end
 766
 767 --- Test whether the given init script is enabled
 768 -- @param name  Name of the init script
 769 -- @return              Boolean indicating whether init is enabled
 770 function init.enabled(name)
 771         if fs.access(init.dir..name) then
 772                 return ( call(init.dir..name.." enabled") == 0 )
 773         end
 774         return false
 775 end
 776
 777 --- Get the index of he given init script
 778 -- @param name  Name of the init script
 779 -- @return              Numeric index value
 780 function init.index(name)
 781         if fs.access(init.dir..name) then
 782                 return call("source "..init.dir..name.." enabled; exit $START")
 783         end
 784 end
 785
 786 --- Enable the given init script
 787 -- @param name  Name of the init script
 788 -- @return              Boolean indicating success
 789 function init.enable(name)
 790         if fs.access(init.dir..name) then
 791                 return ( call(init.dir..name.." enable") == 1 )
 792         end
 793 end
 794
 795 --- Disable the given init script
 796 -- @param name  Name of the init script
 797 -- @return              Boolean indicating success
 798 function init.disable(name)
 799         if fs.access(init.dir..name) then
 800                 return ( call(init.dir..name.." disable") == 0 )
 801         end
 802 end
 803
 804
 805 -- Internal functions
 806
 807 function _parse_delimited_table(iter, delimiter, callback)
 808         delimiter = delimiter or "%s+"
 809
 810         local data  = {}
 811         local trim  = luci.util.trim
 812         local split = luci.util.split
 813
 814         local keys = split(trim(iter()), delimiter, nil, true)
 815         for i, j in pairs(keys) do
 816                 keys[i] = trim(keys[i])
 817         end
 818
 819         for line in iter do
 820                 local row = {}
 821                 line = trim(line)
 822                 if #line > 0 then
 823                         for i, j in pairs(split(line, delimiter, nil, true)) do
 824                                 if keys[i] then
 825                                         row[keys[i]] = j
 826                                 end
 827                         end
 828                 end
 829
 830                 if callback then
 831                         callback(row)
 832                 else
 833                         data[#data+1] = row
 834                 end
 835         end
 836
 837         return data
 838 end
 839
 840 function _parse_mixed_record(cnt, delimiter)
 841         delimiter = delimiter or "  "
 842         local data = {}
 843         local flags = {}
 844
 845         for i, l in pairs(luci.util.split(luci.util.trim(cnt), "\n")) do
 846                 for j, f in pairs(luci.util.split(luci.util.trim(l), delimiter, nil, true)) do
 847                         local k, x, v = f:match('([^%s][^:=]*) *([:=]*) *"*([^\n"]*)"*')
 848
 849                         if k then
 850                                 if x == "" then
 851                                         table.insert(flags, k)
 852                                 else
 853                                         data[k] = v
 854                                 end
 855                         end
 856                 end
 857         end
 858
 859         return data, flags
 860 end