diff options
Diffstat (limited to 'applications/luci-app-commands/luasrc/controller/commands.lua')
| -rw-r--r-- | applications/luci-app-commands/luasrc/controller/commands.lua | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/applications/luci-app-commands/luasrc/controller/commands.lua b/applications/luci-app-commands/luasrc/controller/commands.lua new file mode 100644 index 000000000..b9f0ce879 --- /dev/null +++ b/applications/luci-app-commands/luasrc/controller/commands.lua @@ -0,0 +1,237 @@ +--[[ +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) + 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 |