1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
--[[
LuCI - Lua Configuration Interface
Copyright 2012 Jo-Philipp Wich <jow@openwrt.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
]]--
module("luci.controller.commands", package.seeall)
function index()
entry({"admin", "system", "commands"}, firstchild(), _("Custom Commands"), 80).i18n = "commands"
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()
local path = luci.dispatcher.context.requestpath
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 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"
% argv[1]:gsub("%W+", ".") .. ".bin")
luci.http.prepare_content("application/octet-stream")
else
luci.http.header("Content-Disposition", "attachment; filename=%s"
% 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 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
|
