core/src/ffluci/sys.lua

   1 --[[
   2 FFLuCI - 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 module("ffluci.sys", package.seeall)
  28 require("posix")
  29
  30 -- Runs "command" and returns its output
  31 function exec(command)
  32         local pp   = io.popen(command)
  33         local data = pp:read("*a")
  34         pp:close()
  35
  36         return data
  37 end
  38
  39 -- Runs "command" and returns its output as a array of lines
  40 function execl(command)
  41         local pp   = io.popen(command)
  42         local line = ""
  43         local data = {}
  44
  45         while true do
  46                 line = pp:read()
  47                 if (line == nil) then break end
  48                 table.insert(data, line)
  49         end
  50         pp:close()
  51
  52         return data
  53 end
  54
  55 -- Uses "ffluci-flash" to flash a new image file to the system
  56 function flash(image, kpattern)
  57         local cmd = "ffluci-flash "
  58         if kpattern then
  59                 cmd = cmd .. "-k '" .. kpattern:gsub("'", "") .. "' "
  60         end
  61         cmd = cmd .. "'" .. image:gsub("'", "") .. "' >/dev/null 2>&1"
  62
  63         return os.execute(cmd)
  64 end
  65
  66 -- Returns the hostname
  67 function hostname()
  68         return io.lines("/proc/sys/kernel/hostname")()
  69 end
  70
  71 -- Returns the load average
  72 function loadavg()
  73         local loadavg = io.lines("/proc/loadavg")()
  74         return loadavg:match("^(.-) (.-) (.-) (.-) (.-)$")
  75 end
  76
  77 -- Reboots the system
  78 function reboot()
  79         return os.execute("reboot >/dev/null 2>&1")
  80 end
  81
  82
  83 group = {}
  84 group.getgroup = posix.getgroup
  85
  86 net = {}
  87 -- Returns all available network interfaces
  88 function net.devices()
  89         local devices = {}
  90         for line in io.lines("/proc/net/dev") do
  91                 table.insert(devices, line:match(" *(.-):"))
  92         end
  93         return devices
  94 end
  95
  96 process = {}
  97 process.info = posix.getpid
  98
  99 -- Sets the gid of a process
 100 function process.setgroup(pid, gid)
 101         return posix.setpid("g", pid, gid)
 102 end
 103
 104 -- Sets the uid of a process
 105 function process.setuser(pid, uid)
 106         return posix.setpid("u", pid, uid)
 107 end
 108
 109 user = {}
 110 -- returns user information to a given uid
 111 user.getuser = posix.getpasswd
 112
 113 -- Changes the user password of given user
 114 function user.setpasswd(user, pwd)
 115         if pwd then
 116                 pwd = pwd:gsub("'", "")
 117         end
 118
 119         if user then
 120                 user = user:gsub("'", "")
 121         end
 122
 123         local cmd = "(echo '"..pwd.."';sleep 1;echo '"..pwd.."')|"
 124         cmd = cmd .. "passwd '"..user.."' >/dev/null 2>&1"
 125         return os.execute(cmd)
 126 end