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--[[
LuCI - System library
Description:
Utilities for interaction with the Linux system
FileId:
$Id$
License:
Copyright 2008 Steven Barth <steven@midlink.org>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
module("luci.sys", package.seeall)
require("posix")
require("luci.bits")
require("luci.util")
require("luci.fs")
-- Returns whether a system is bigendian
function bigendian()
local fp = io.open("/bin/sh")
fp:seek("set", 5)
local be = (fp:read(1):byte() ~= 1)
fp:close()
return be
end
-- Runs "command" and returns its output
function exec(command)
local pp = io.popen(command)
local data = pp:read("*a")
pp:close()
return data
end
-- Runs "command" and returns its output as a array of lines
function execl(command)
local pp = io.popen(command)
local line = ""
local data = {}
while true do
line = pp:read()
if (line == nil) then break end
table.insert(data, line)
end
pp:close()
return data
end
-- Uses "luci-flash" to flash a new image file to the system
function flash(image, kpattern)
local cmd = "luci-flash "
if kpattern then
cmd = cmd .. "-k '" .. kpattern:gsub("'", "") .. "' "
end
cmd = cmd .. "'" .. image:gsub("'", "") .. "' >/dev/null 2>&1"
return os.execute(cmd)
end
-- Returns the enivornment
getenv = posix.getenv
-- Returns the hostname
function hostname()
return io.lines("/proc/sys/kernel/hostname")()
end
-- Returns the contents of a documented referred by an URL
function httpget(url)
return exec("wget -qO- '"..url:gsub("'", "").."'")
end
-- Returns the FFLuci-Basedir
function libpath()
return luci.fs.dirname(require("luci.debug").__file__)
end
-- Returns the load average
function loadavg()
local loadavg = io.lines("/proc/loadavg")()
return loadavg:match("^(.-) (.-) (.-) (.-) (.-)$")
end
-- Reboots the system
function reboot()
return os.execute("reboot >/dev/null 2>&1")
end
-- Returns the system type, cpu name, and installed physical memory
function sysinfo()
local c1 = "cat /proc/cpuinfo|grep system\\ typ|cut -d: -f2 2>/dev/null"
local c2 = "uname -m 2>/dev/null"
local c3 = "cat /proc/cpuinfo|grep model\\ name|cut -d: -f2 2>/dev/null"
local c4 = "cat /proc/cpuinfo|grep cpu\\ model|cut -d: -f2 2>/dev/null"
local c5 = "cat /proc/meminfo|grep MemTotal|cut -d: -f2 2>/dev/null"
local s = luci.util.trim(exec(c1))
local m = ""
local r = ""
if s == "" then
s = luci.util.trim(exec(c2))
m = luci.util.trim(exec(c3))
else
m = luci.util.trim(exec(c4))
end
r = luci.util.trim(exec(c5))
return s, m, r
end
-- Reads the syslog
function syslog()
return exec("logread")
end
-- Generates a random key of length BYTES
function uniqueid(bytes)
local fp = io.open("/dev/urandom")
local chunk = { fp:read(bytes):byte(1, bytes) }
fp:close()
local hex = ""
local pattern = "%02X"
for i, byte in ipairs(chunk) do
hex = hex .. pattern:format(byte)
end
return hex
end
group = {}
group.getgroup = posix.getgroup
net = {}
-- Returns the ARP-Table
function net.arptable()
return _parse_delimited_table(io.lines("/proc/net/arp"), "%s%s+")
end
-- Returns whether an IP-Adress belongs to a certain net
function net.belongs(ip, ipnet, prefix)
return (net.ip4bin(ip):sub(1, prefix) == net.ip4bin(ipnet):sub(1, prefix))
end
-- Detect the default route
function net.defaultroute()
local routes = net.routes()
local route = nil
for i, r in pairs(luci.sys.net.routes()) do
if r.Destination == "00000000" and (not route or route.Metric > r.Metric) then
route = r
end
end
return route
end
-- Returns all available network interfaces
function net.devices()
local devices = {}
for line in io.lines("/proc/net/dev") do
table.insert(devices, line:match(" *(.-):"))
end
return devices
end
-- Returns the MAC-Address belonging to the given IP-Address
function net.ip4mac(ip)
local mac = nil
for i, l in ipairs(net.arptable()) do
if l["IP address"] == ip then
mac = l["HW address"]
end
end
return mac
end
-- Returns the prefix to a given netmask
function net.mask4prefix(mask)
local bin = net.ip4bin(mask)
if not bin then
return nil
end
return #luci.util.split(bin, "1")-1
end
-- Returns the kernel routing table
function net.routes()
return _parse_delimited_table(io.lines("/proc/net/route"))
end
-- Returns the numeric IP to a given hexstring
function net.hexip4(hex, be)
if #hex ~= 8 then
return nil
end
be = be or bigendian()
local hexdec = luci.bits.Hex2Dec
local ip = ""
if be then
ip = ip .. tostring(hexdec(hex:sub(1,2))) .. "."
ip = ip .. tostring(hexdec(hex:sub(3,4))) .. "."
ip = ip .. tostring(hexdec(hex:sub(5,6))) .. "."
ip = ip .. tostring(hexdec(hex:sub(7,8)))
else
ip = ip .. tostring(hexdec(hex:sub(7,8))) .. "."
ip = ip .. tostring(hexdec(hex:sub(5,6))) .. "."
ip = ip .. tostring(hexdec(hex:sub(3,4))) .. "."
ip = ip .. tostring(hexdec(hex:sub(1,2)))
end
return ip
end
-- Returns the binary IP to a given IP
function net.ip4bin(ip)
local parts = luci.util.split(ip, '.')
if #parts ~= 4 then
return nil
end
local decbin = luci.bits.Dec2Bin
local bin = ""
bin = bin .. decbin(parts[1], 8)
bin = bin .. decbin(parts[2], 8)
bin = bin .. decbin(parts[3], 8)
bin = bin .. decbin(parts[4], 8)
return bin
end
-- Tests whether a host is pingable
function net.pingtest(host)
return os.execute("ping -c1 '"..host:gsub("'", '').."' >/dev/null 2>&1")
end
process = {}
process.info = posix.getpid
-- Sets the gid of a process
function process.setgroup(pid, gid)
return posix.setpid("g", pid, gid)
end
-- Sets the uid of a process
function process.setuser(pid, uid)
return posix.setpid("u", pid, uid)
end
user = {}
-- returns user information to a given uid
user.getuser = posix.getpasswd
-- checks whether a string matches the password of a certain system user
function user.checkpasswd(username, password)
local account = user.getuser(username)
-- FIXME: detect testing environment
if luci.fs.isfile("/etc/shadow") and not luci.fs.access("/etc/shadow", "r") then
return true
elseif account then
if account.passwd == "!" then
return true
else
return (account.passwd == posix.crypt(password, account.passwd))
end
end
end
-- Changes the user password of given user
function user.setpasswd(user, pwd)
if pwd then
pwd = pwd:gsub("'", "")
end
if user then
user = user:gsub("'", "")
end
local cmd = "(echo '"..pwd.."';sleep 1;echo '"..pwd.."')|"
cmd = cmd .. "passwd '"..user.."' >/dev/null 2>&1"
return os.execute(cmd)
end
wifi = {}
function wifi.getiwconfig()
local cnt = exec("/usr/sbin/iwconfig 2>/dev/null")
local iwc = {}
for i, l in pairs(luci.util.split(luci.util.trim(cnt), "\n\n")) do
local k = l:match("^(.-) ")
l = l:gsub("^(.-) +", "", 1)
if k then
iwc[k] = _parse_mixed_record(l)
end
end
return iwc
end
function wifi.iwscan()
local cnt = exec("iwlist scan 2>/dev/null")
local iws = {}
for i, l in pairs(luci.util.split(luci.util.trim(cnt), "\n\n")) do
local k = l:match("^(.-) ")
l = l:gsub("^[^\n]+", "", 1)
l = luci.util.trim(l)
if k then
iws[k] = {}
for j, c in pairs(luci.util.split(l, "\n Cell")) do
c = c:gsub("^(.-)- ", "", 1)
c = luci.util.split(c, "\n", 7)
c = table.concat(c, "\n", 1)
table.insert(iws[k], _parse_mixed_record(c))
end
end
end
return iws
end
-- Internal functions
function _parse_delimited_table(iter, delimiter)
delimiter = delimiter or "%s+"
local data = {}
local trim = luci.util.trim
local split = luci.util.split
local keys = split(trim(iter()), delimiter, nil, true)
for i, j in pairs(keys) do
keys[i] = trim(keys[i])
end
for line in iter do
local row = {}
line = trim(line)
if #line > 0 then
for i, j in pairs(split(line, delimiter, nil, true)) do
if keys[i] then
row[keys[i]] = j
end
end
end
table.insert(data, row)
end
return data
end
function _parse_mixed_record(cnt)
local data = {}
for i, l in pairs(luci.util.split(luci.util.trim(cnt), "\n")) do
for j, f in pairs(luci.util.split(luci.util.trim(l), " ")) do
local k, x, v = f:match('([^%s][^:=]+) *([:=]*) *"*([^\n"]*)"*')
if k then
if x == "" then
table.insert(data, k)
else
data[k] = v
end
end
end
end
return data
end
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