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-- Copyright 2012 Jo-Philipp Wich <jow@openwrt.org>
-- Licensed to the public under the Apache License 2.0.
module("luci.controller.commands", package.seeall)
function index()
entry({"admin", "system", "commands"}, firstchild(), _("Custom Commands"), 80)
entry({"admin", "system", "commands", "dashboard"}, template("commands"), _("Dashboard"), 1)
entry({"admin", "system", "commands", "config"}, cbi("commands"), _("Configure"), 2)
entry({"admin", "system", "commands", "run"}, call("action_run"), nil, 3).leaf = true
entry({"admin", "system", "commands", "download"}, call("action_download"), nil, 3).leaf = true
entry({"command"}, call("action_public"), nil, 1).leaf = true
end
--- Decode a given string into arguments following shell quoting rules
--- [[abc \def "foo\"bar" abc'def']] -> [[abc def]] [[foo"bar]] [[abcdef]]
local function parse_args(str)
local args = { }
local function isspace(c)
if c == 9 or c == 10 or c == 11 or c == 12 or c == 13 or c == 32 then
return c
end
end
local function isquote(c)
if c == 34 or c == 39 or c == 96 then
return c
end
end
local function isescape(c)
if c == 92 then
return c
end
end
local function ismeta(c)
if c == 36 or c == 92 or c == 96 then
return c
end
end
--- Convert given table of byte values into a Lua string and append it to
--- the "args" table. Segment byte value sequence into chunks of 256 values
--- to not trip over the parameter limit for string.char()
local function putstr(bytes)
local chunks = { }
local csz = 256
local upk = unpack
local chr = string.char
local min = math.min
local len = #bytes
local off
for off = 1, len, csz do
chunks[#chunks+1] = chr(upk(bytes, off, min(off + csz - 1, len)))
end
args[#args+1] = table.concat(chunks)
end
--- Scan substring defined by the indexes [s, e] of the string "str",
--- perform unquoting and de-escaping on the fly and store the result in
--- a table of byte values which is passed to putstr()
local function unquote(s, e)
local off, esc, quote
local res = { }
for off = s, e do
local byte = str:byte(off)
local q = isquote(byte)
local e = isescape(byte)
local m = ismeta(byte)
if e then
esc = true
elseif esc then
if m then res[#res+1] = 92 end
res[#res+1] = byte
esc = false
elseif q and quote and q == quote then
quote = nil
elseif q and not quote then
quote = q
else
if m then res[#res+1] = 92 end
res[#res+1] = byte
end
end
putstr(res)
end
--- Find substring boundaries in "str". Ignore escaped or quoted
--- whitespace, pass found start- and end-index for each substring
--- to unquote()
local off, esc, start, quote
for off = 1, #str + 1 do
local byte = str:byte(off)
local q = isquote(byte)
local s = isspace(byte) or (off > #str)
local e = isescape(byte)
if esc then
esc = false
elseif e then
esc = true
elseif q and quote and q == quote then
quote = nil
elseif q and not quote then
start = start or off
quote = q
elseif s and not quote then
if start then
unquote(start, off - 1)
start = nil
end
else
start = start or off
end
end
--- If the "quote" is still set we encountered an unfinished string
if quote then
unquote(start, #str)
end
return args
end
local function parse_cmdline(cmdid, args)
local uci = require "luci.model.uci".cursor()
if uci:get("luci", cmdid) == "command" then
local cmd = uci:get_all("luci", cmdid)
local argv = parse_args(cmd.command)
local i, v
if cmd.param == "1" and args then
for i, v in ipairs(parse_args(luci.http.urldecode(args))) do
argv[#argv+1] = v
end
end
for i, v in ipairs(argv) do
if v:match("[^%w%.%-i/]") then
argv[i] = '"%s"' % v:gsub('"', '\\"')
end
end
return argv
end
end
function action_run(...)
local fs = require "nixio.fs"
local argv = parse_cmdline(...)
if argv then
local outfile = os.tmpname()
local errfile = os.tmpname()
local rv = os.execute(table.concat(argv, " ") .. " >%s 2>%s" %{ outfile, errfile })
local stdout = fs.readfile(outfile, 1024 * 512) or ""
local stderr = fs.readfile(errfile, 1024 * 512) or ""
fs.unlink(outfile)
fs.unlink(errfile)
local binary = not not (stdout:match("[%z\1-\8\14-\31]"))
luci.http.prepare_content("application/json")
luci.http.write_json({
command = table.concat(argv, " "),
stdout = not binary and stdout,
stderr = stderr,
exitcode = rv,
binary = binary
})
else
luci.http.status(404, "No such command")
end
end
function action_download(...)
local fs = require "nixio.fs"
local argv = parse_cmdline(...)
if argv then
local fd = io.popen(table.concat(argv, " ") .. " 2>/dev/null")
if fd then
local chunk = fd:read(4096) or ""
local name
if chunk:match("[%z\1-\8\14-\31]") then
luci.http.header("Content-Disposition", "attachment; filename=%s"
% fs.basename(argv[1]):gsub("%W+", ".") .. ".bin")
luci.http.prepare_content("application/octet-stream")
else
luci.http.header("Content-Disposition", "attachment; filename=%s"
% fs.basename(argv[1]):gsub("%W+", ".") .. ".txt")
luci.http.prepare_content("text/plain")
end
while chunk do
luci.http.write(chunk)
chunk = fd:read(4096)
end
fd:close()
else
luci.http.status(500, "Failed to execute command")
end
else
luci.http.status(404, "No such command")
end
end
function action_public(cmdid, args)
local uci = require "luci.model.uci".cursor()
if cmdid and
uci:get("luci", cmdid) == "command" and
uci:get("luci", cmdid, "public") == "1"
then
action_download(cmdid, args)
else
luci.http.status(403, "Access to command denied")
end
end
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