783 lines
21 KiB
Lua
783 lines
21 KiB
Lua
--[[
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LuCI - System library
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Description:
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Utilities for interaction with the Linux system
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FileId:
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$Id: sys.lua 3867 2008-12-07 19:49:45Z Cyrus $
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License:
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Copyright 2008 Steven Barth <steven@midlink.org>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]--
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local io = require "io"
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local os = require "os"
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local posix = require "posix"
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local table = require "table"
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local luci = {}
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luci.util = require "luci.util"
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luci.fs = require "luci.fs"
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luci.ip = require "luci.ip"
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local tonumber, ipairs, pairs, pcall = tonumber, ipairs, pairs, pcall
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--- LuCI Linux and POSIX system utilities.
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module "luci.sys"
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--- Execute a given shell command and return the error code
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-- @class function
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-- @name call
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-- @param ... Command to call
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-- @return Error code of the command
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function call(...)
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return os.execute(...) / 256
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end
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--- Execute a given shell command and capture its standard output
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-- @class function
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-- @name exec
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-- @param command Command to call
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-- @return String containg the return the output of the command
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exec = luci.util.exec
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--- Invoke the luci-flash executable to write an image to the flash memory.
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-- @param image Local path or URL to image file
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-- @param kpattern Pattern of files to keep over flash process
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-- @return Return value of os.execute()
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function flash(image, kpattern)
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local cmd = "luci-flash "
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if kpattern then
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cmd = cmd .. "-k '" .. kpattern:gsub("'", "") .. "' "
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end
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cmd = cmd .. "'" .. image:gsub("'", "") .. "' >/dev/null 2>&1"
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return os.execute(cmd)
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end
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--- Retrieve information about currently mounted file systems.
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-- @return Table containing mount information
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function mounts()
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local data = {}
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local k = {"fs", "blocks", "used", "available", "percent", "mountpoint"}
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local ps = luci.util.execi("df")
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if not ps then
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return
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else
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ps()
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end
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for line in ps do
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local row = {}
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local j = 1
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for value in line:gmatch("[^%s]+") do
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row[k[j]] = value
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j = j + 1
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end
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if row[k[1]] then
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-- this is a rather ugly workaround to cope with wrapped lines in
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-- the df output:
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--
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-- /dev/scsi/host0/bus0/target0/lun0/part3
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-- 114382024 93566472 15005244 86% /mnt/usb
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--
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if not row[k[2]] then
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j = 2
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line = ps()
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for value in line:gmatch("[^%s]+") do
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row[k[j]] = value
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j = j + 1
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end
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end
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table.insert(data, row)
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end
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end
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return data
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end
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--- Retrieve environment variables. If no variable is given then a table
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-- containing the whole environment is returned otherwise this function returns
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-- the corresponding string value for the given name or nil if no such variable
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-- exists.
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-- @class function
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-- @name getenv
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-- @param var Name of the environment variable to retrieve (optional)
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-- @return String containg the value of the specified variable
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-- @return Table containing all variables if no variable name is given
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getenv = posix.getenv
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--- Determine the current hostname.
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-- @return String containing the system hostname
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function hostname()
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return posix.uname("%n")
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end
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--- Returns the contents of a documented referred by an URL.
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-- @param url The URL to retrieve
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-- @param stream Return a stream instead of a buffer
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-- @param target Directly write to target file name
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-- @return String containing the contents of given the URL
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function httpget(url, stream, target)
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if not target then
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local source = stream and io.popen or luci.util.exec
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return source("wget -qO- '"..url:gsub("'", "").."'")
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else
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return os.execute("wget -qO '%s' '%s'" %
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{target:gsub("'", ""), url:gsub("'", "")})
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end
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end
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--- Returns the system load average values.
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-- @return String containing the average load value 1 minute ago
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-- @return String containing the average load value 5 minutes ago
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-- @return String containing the average load value 15 minutes ago
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-- @return String containing the active and total number of processes
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-- @return String containing the last used pid
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function loadavg()
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local loadavg = io.lines("/proc/loadavg")()
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return loadavg:match("^(.-) (.-) (.-) (.-) (.-)$")
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end
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--- Initiate a system reboot.
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-- @return Return value of os.execute()
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function reboot()
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return os.execute("reboot >/dev/null 2>&1")
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end
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--- Returns the system type, cpu name and installed physical memory.
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-- @return String containing the system or platform identifier
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-- @return String containing hardware model information
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-- @return String containing the total memory amount in kB
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-- @return String containing the memory used for caching in kB
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-- @return String containing the memory used for buffering in kB
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-- @return String containing the free memory amount in kB
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function sysinfo()
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local cpuinfo = luci.fs.readfile("/proc/cpuinfo")
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local meminfo = luci.fs.readfile("/proc/meminfo")
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local system = cpuinfo:match("system typ.-:%s*([^\n]+)")
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local model = ""
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local memtotal = tonumber(meminfo:match("MemTotal:%s*(%d+)"))
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local memcached = tonumber(meminfo:match("\nCached:%s*(%d+)"))
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local memfree = tonumber(meminfo:match("MemFree:%s*(%d+)"))
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local membuffers = tonumber(meminfo:match("Buffers:%s*(%d+)"))
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if not system then
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system = posix.uname("%m")
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model = cpuinfo:match("model name.-:%s*([^\n]+)")
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if not model then
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model = cpuinfo:match("Processor.-:%s*([^\n]+)")
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end
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else
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model = cpuinfo:match("cpu model.-:%s*([^\n]+)")
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end
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return system, model, memtotal, memcached, membuffers, memfree
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end
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--- Retrieves the output of the "logread" command.
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-- @return String containing the current log buffer
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function syslog()
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return luci.util.exec("logread")
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end
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--- Retrieves the output of the "dmesg" command.
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-- @return String containing the current log buffer
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function dmesg()
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return luci.util.exec("dmesg")
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end
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--- Generates a random id with specified length.
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-- @param bytes Number of bytes for the unique id
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-- @return String containing hex encoded id
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function uniqueid(bytes)
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local fp = io.open("/dev/urandom")
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local chunk = { fp:read(bytes):byte(1, bytes) }
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fp:close()
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local hex = ""
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local pattern = "%02X"
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for i, byte in ipairs(chunk) do
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hex = hex .. pattern:format(byte)
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end
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return hex
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end
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--- Returns the current system uptime stats.
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-- @return String containing total uptime in seconds
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-- @return String containing idle time in seconds
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function uptime()
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local loadavg = io.lines("/proc/uptime")()
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return loadavg:match("^(.-) (.-)$")
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end
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--- LuCI system utilities / POSIX user group related functions.
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-- @class module
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-- @name luci.sys.group
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group = {}
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--- Returns information about a POSIX user group.
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-- @class function
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-- @name getgroup
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-- @param group Group ID or name of a system user group
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-- @return Table with information about the requested group
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group.getgroup = posix.getgroup
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--- LuCI system utilities / network related functions.
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-- @class module
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-- @name luci.sys.net
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net = {}
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--- Returns the current arp-table entries as two-dimensional table.
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-- @return Table of table containing the current arp entries.
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-- The following fields are defined for arp entry objects:
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-- { "IP address", "HW address", "HW type", "Flags", "Mask", "Device" }
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function net.arptable()
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return _parse_delimited_table(io.lines("/proc/net/arp"), "%s%s+")
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end
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--- Returns conntrack information
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-- @return Table with the currently tracked IP connections
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function net.conntrack()
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local connt = {}
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if luci.fs.access("/proc/net/nf_conntrack", "r") then
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for line in io.lines("/proc/net/nf_conntrack") do
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line = line:match "^(.-( [^ =]+=).-)%2"
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local entry, flags = _parse_mixed_record(line, " +")
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entry.layer3 = flags[1]
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entry.layer4 = flags[3]
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for i=1, #entry do
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entry[i] = nil
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end
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connt[#connt+1] = entry
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end
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elseif luci.fs.access("/proc/net/ip_conntrack", "r") then
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for line in io.lines("/proc/net/ip_conntrack") do
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line = line:match "^(.-( [^ =]+=).-)%2"
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local entry, flags = _parse_mixed_record(line, " +")
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entry.layer3 = "ipv4"
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entry.layer4 = flags[1]
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for i=1, #entry do
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entry[i] = nil
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end
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connt[#connt+1] = entry
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end
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else
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return nil
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end
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return connt
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end
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--- Determine the current IPv4 default route. If multiple default routes exist,
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-- return the one with the lowest metric.
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-- @return Table with the properties of the current default route.
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-- The following fields are defined:
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-- { "dest", "gateway", "metric", "refcount", "usecount", "irtt",
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-- "flags", "device" }
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function net.defaultroute()
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local route = nil
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for _, r in pairs(net.routes()) do
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if r.dest:prefix() == 0 and (not route or route.metric > r.metric) then
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route = r
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end
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end
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return route
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end
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--- Determine the current IPv6 default route. If multiple default routes exist,
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-- return the one with the lowest metric.
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-- @return Table with the properties of the current default route.
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-- The following fields are defined:
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-- { "source", "dest", "nexthop", "metric", "refcount", "usecount",
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-- "flags", "device" }
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function net.defaultroute6()
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local route = nil
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local routes6 = net.routes6()
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if routes6 then
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for _, r in pairs(routes6) do
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if r.dest:prefix() == 0 and
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(not route or route.metric > r.metric)
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then
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route = r
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end
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end
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end
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return route
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end
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--- Determine the names of available network interfaces.
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-- @return Table containing all current interface names
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function net.devices()
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local devices = {}
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for line in io.lines("/proc/net/dev") do
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table.insert(devices, line:match(" *(.-):"))
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end
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return devices
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end
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--- Return information about available network interfaces.
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-- @return Table containing all current interface names and their information
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function net.deviceinfo()
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local devices = {}
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for line in io.lines("/proc/net/dev") do
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local name, data = line:match("^ *(.-): *(.*)$")
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if name and data then
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devices[name] = luci.util.split(data, " +", nil, true)
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end
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end
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return devices
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end
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-- Determine the MAC address belonging to the given IP address.
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-- @param ip IPv4 address
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-- @return String containing the MAC address or nil if it cannot be found
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function net.ip4mac(ip)
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local mac = nil
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for i, l in ipairs(net.arptable()) do
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if l["IP address"] == ip then
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mac = l["HW address"]
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end
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end
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return mac
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end
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--- Returns the current kernel routing table entries.
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-- @return Table of tables with properties of the corresponding routes.
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-- The following fields are defined for route entry tables:
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-- { "dest", "gateway", "metric", "refcount", "usecount", "irtt",
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-- "flags", "device" }
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function net.routes()
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local routes = { }
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for line in io.lines("/proc/net/route") do
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local dev, dst_ip, gateway, flags, refcnt, usecnt, metric,
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dst_mask, mtu, win, irtt = line:match(
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"([^%s]+)\t([A-F0-9]+)\t([A-F0-9]+)\t([A-F0-9]+)\t" ..
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"(%d+)\t(%d+)\t(%d+)\t([A-F0-9]+)\t(%d+)\t(%d+)\t(%d+)"
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)
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if dev then
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gateway = luci.ip.Hex( gateway, 32, luci.ip.FAMILY_INET4 )
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dst_mask = luci.ip.Hex( dst_mask, 32, luci.ip.FAMILY_INET4 )
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dst_ip = luci.ip.Hex(
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dst_ip, dst_mask:prefix(dst_mask), luci.ip.FAMILY_INET4
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)
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routes[#routes+1] = {
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dest = dst_ip,
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gateway = gateway,
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metric = tonumber(metric),
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refcount = tonumber(refcnt),
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usecount = tonumber(usecnt),
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mtu = tonumber(mtu),
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window = tonumber(window),
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irtt = tonumber(irtt),
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flags = tonumber(flags, 16),
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device = dev
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}
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end
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end
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return routes
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end
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--- Returns the current ipv6 kernel routing table entries.
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-- @return Table of tables with properties of the corresponding routes.
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-- The following fields are defined for route entry tables:
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-- { "source", "dest", "nexthop", "metric", "refcount", "usecount",
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-- "flags", "device" }
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function net.routes6()
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if luci.fs.access("/proc/net/ipv6_route", "r") then
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local routes = { }
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for line in io.lines("/proc/net/ipv6_route") do
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local dst_ip, dst_prefix, src_ip, src_prefix, nexthop,
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metric, refcnt, usecnt, flags, dev = line:match(
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"([a-f0-9]+) ([a-f0-9]+) " ..
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"([a-f0-9]+) ([a-f0-9]+) " ..
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"([a-f0-9]+) ([a-f0-9]+) " ..
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"([a-f0-9]+) ([a-f0-9]+) " ..
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"([a-f0-9]+) +([^%s]+)"
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)
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src_ip = luci.ip.Hex(
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src_ip, tonumber(src_prefix, 16), luci.ip.FAMILY_INET6, false
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)
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dst_ip = luci.ip.Hex(
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dst_ip, tonumber(dst_prefix, 16), luci.ip.FAMILY_INET6, false
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)
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nexthop = luci.ip.Hex( nexthop, 128, luci.ip.FAMILY_INET6, false )
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routes[#routes+1] = {
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source = src_ip,
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dest = dst_ip,
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nexthop = nexthop,
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metric = tonumber(metric, 16),
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refcount = tonumber(refcnt, 16),
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usecount = tonumber(usecnt, 16),
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flags = tonumber(flags, 16),
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device = dev
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}
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end
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return routes
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end
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end
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--- Tests whether the given host responds to ping probes.
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-- @param host String containing a hostname or IPv4 address
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-- @return Number containing 0 on success and >= 1 on error
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function net.pingtest(host)
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return os.execute("ping -c1 '"..host:gsub("'", '').."' >/dev/null 2>&1")
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end
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--- LuCI system utilities / process related functions.
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-- @class module
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-- @name luci.sys.process
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process = {}
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--- Get the current process id.
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-- @class function
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-- @name process.info
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-- @return Number containing the current pid
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process.info = posix.getpid
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--- Retrieve information about currently running processes.
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-- @return Table containing process information
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function process.list()
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local data = {}
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local k
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local ps = luci.util.execi("top -bn1")
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if not ps then
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return
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end
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while true do
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local line = ps()
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if not line then
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return
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end
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k = luci.util.split(luci.util.trim(line), "%s+", nil, true)
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if k[1] == "PID" then
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break
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end
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end
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for line in ps do
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local row = {}
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line = luci.util.trim(line)
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for i, value in ipairs(luci.util.split(line, "%s+", #k-1, true)) do
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row[k[i]] = value
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end
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local pid = tonumber(row[k[1]])
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if pid then
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data[pid] = row
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end
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end
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return data
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end
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--- Set the gid of a process identified by given pid.
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-- @param pid Number containing the process id
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-- @param gid Number containing the Unix group id
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-- @return Boolean indicating successful operation
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-- @return String containing the error message if failed
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-- @return Number containing the error code if failed
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function process.setgroup(pid, gid)
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return posix.setpid("g", pid, gid)
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end
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--- Set the uid of a process identified by given pid.
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-- @param pid Number containing the process id
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-- @param uid Number containing the Unix user id
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-- @return Boolean indicating successful operation
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-- @return String containing the error message if failed
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-- @return Number containing the error code if failed
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function process.setuser(pid, uid)
|
|
return posix.setpid("u", pid, uid)
|
|
end
|
|
|
|
--- Send a signal to a process identified by given pid.
|
|
-- @class function
|
|
-- @name process.signal
|
|
-- @param pid Number containing the process id
|
|
-- @param sig Signal to send (default: 15 [SIGTERM])
|
|
-- @return Boolean indicating successful operation
|
|
-- @return Number containing the error code if failed
|
|
process.signal = posix.kill
|
|
|
|
|
|
--- LuCI system utilities / user related functions.
|
|
-- @class module
|
|
-- @name luci.sys.user
|
|
user = {}
|
|
|
|
--- Retrieve user informations for given uid.
|
|
-- @class function
|
|
-- @name getuser
|
|
-- @param uid Number containing the Unix user id
|
|
-- @return Table containing the following fields:
|
|
-- { "uid", "gid", "name", "passwd", "dir", "shell", "gecos" }
|
|
user.getuser = posix.getpasswd
|
|
|
|
--- Test whether given string matches the password of a given system user.
|
|
-- @param username String containing the Unix user name
|
|
-- @param password String containing the password to compare
|
|
-- @return Boolean indicating wheather the passwords are equal
|
|
function user.checkpasswd(username, password)
|
|
local account = user.getuser(username)
|
|
|
|
if account then
|
|
local pwd = account.passwd
|
|
local shadowpw
|
|
if #pwd == 1 then
|
|
if luci.fs.stat("/etc/shadow") then
|
|
if not pcall(function()
|
|
for l in io.lines("/etc/shadow") do
|
|
shadowpw = l:match("^%s:([^:]+)" % username)
|
|
if shadowpw then
|
|
pwd = shadowpw
|
|
break
|
|
end
|
|
end
|
|
end) then
|
|
return nil, "Unable to access shadow-file"
|
|
end
|
|
end
|
|
|
|
if pwd == "!" then
|
|
return true
|
|
end
|
|
end
|
|
|
|
if pwd and #pwd > 0 and password and #password > 0 then
|
|
return (pwd == posix.crypt(password, pwd))
|
|
end
|
|
end
|
|
|
|
return false
|
|
end
|
|
|
|
--- Change the password of given user.
|
|
-- @param username String containing the Unix user name
|
|
-- @param password String containing the password to compare
|
|
-- @return Number containing 0 on success and >= 1 on error
|
|
function user.setpasswd(username, password)
|
|
if password then
|
|
password = password:gsub("'", "")
|
|
end
|
|
|
|
if username then
|
|
username = username:gsub("'", "")
|
|
end
|
|
|
|
local cmd = "(echo '"..password.."';sleep 1;echo '"..password.."')|"
|
|
cmd = cmd .. "passwd '"..username.."' >/dev/null 2>&1"
|
|
return os.execute(cmd)
|
|
end
|
|
|
|
|
|
--- LuCI system utilities / wifi related functions.
|
|
-- @class module
|
|
-- @name luci.sys.wifi
|
|
wifi = {}
|
|
|
|
--- Get iwconfig output for all wireless devices.
|
|
-- @return Table of tables containing the iwconfing output for each wifi device
|
|
function wifi.getiwconfig()
|
|
local cnt = luci.util.exec("PATH=/sbin:/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
|
|
local entry, flags = _parse_mixed_record(l)
|
|
if entry then
|
|
entry.flags = flags
|
|
end
|
|
iwc[k] = entry
|
|
end
|
|
end
|
|
|
|
return iwc
|
|
end
|
|
|
|
--- Get iwlist scan output from all wireless devices.
|
|
-- @return Table of tables contaiing all scan results
|
|
function wifi.iwscan(iface)
|
|
local siface = iface or ""
|
|
local cnt = luci.util.exec("iwlist "..siface.." 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)
|
|
local entry, flags = _parse_mixed_record(c)
|
|
if entry then
|
|
entry.flags = flags
|
|
end
|
|
table.insert(iws[k], entry)
|
|
end
|
|
end
|
|
end
|
|
|
|
return iface and (iws[iface] or {}) or iws
|
|
end
|
|
|
|
|
|
--- LuCI system utilities / init related functions.
|
|
-- @class module
|
|
-- @name luci.sys.init
|
|
init = {}
|
|
init.dir = "/etc/init.d/"
|
|
|
|
--- Get the names of all installed init scripts
|
|
-- @return Table containing the names of all inistalled init scripts
|
|
function init.names()
|
|
local names = { }
|
|
for _, name in ipairs(luci.fs.glob(init.dir.."*")) do
|
|
names[#names+1] = luci.fs.basename(name)
|
|
end
|
|
return names
|
|
end
|
|
|
|
--- Test whether the given init script is enabled
|
|
-- @param name Name of the init script
|
|
-- @return Boolean indicating whether init is enabled
|
|
function init.enabled(name)
|
|
if luci.fs.access(init.dir..name) then
|
|
return ( call(init.dir..name.." enabled") == 0 )
|
|
end
|
|
return false
|
|
end
|
|
|
|
--- Get the index of he given init script
|
|
-- @param name Name of the init script
|
|
-- @return Numeric index value
|
|
function init.index(name)
|
|
if luci.fs.access(init.dir..name) then
|
|
return call("source "..init.dir..name.."; exit $START")
|
|
end
|
|
end
|
|
|
|
--- Enable the given init script
|
|
-- @param name Name of the init script
|
|
-- @return Boolean indicating success
|
|
function init.enable(name)
|
|
if luci.fs.access(init.dir..name) then
|
|
return ( call(init.dir..name.." enable") == 1 )
|
|
end
|
|
end
|
|
|
|
--- Disable the given init script
|
|
-- @param name Name of the init script
|
|
-- @return Boolean indicating success
|
|
function init.disable(name)
|
|
if luci.fs.access(init.dir..name) then
|
|
return ( call(init.dir..name.." disable") == 0 )
|
|
end
|
|
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, delimiter)
|
|
delimiter = delimiter or " "
|
|
local data = {}
|
|
local flags = {}
|
|
|
|
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), delimiter, nil, true)) do
|
|
local k, x, v = f:match('([^%s][^:=]*) *([:=]*) *"*([^\n"]*)"*')
|
|
|
|
if k then
|
|
if x == "" then
|
|
table.insert(flags, k)
|
|
else
|
|
data[k] = v
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
return data, flags
|
|
end
|