luci-base: log login attempts

[project/luci.git] / modules / luci-base / luasrc / util.lua

diff --git a/modules/luci-base/luasrc/util.lua b/modules/luci-base/luasrc/util.lua
index 787bc66..0e7334b 100644 (file)
--- a/modules/luci-base/luasrc/util.lua
+++ b/modules/luci-base/luasrc/util.lua
@@ -16,7 +16,7 @@ local _ubus_connection = nil
 
 local getmetatable, setmetatable = getmetatable, setmetatable
 local rawget, rawset, unpack = rawget, rawset, unpack
-local tostring, type, assert = tostring, type, assert
+local tostring, type, assert, error = tostring, type, assert, error
 local ipairs, pairs, next, loadstring = ipairs, pairs, next, loadstring
 local require, pcall, xpcall = require, pcall, xpcall
 local collectgarbage, get_memory_limit = collectgarbage, get_memory_limit
@@ -27,14 +27,27 @@ module "luci.util"
 -- Pythonic string formatting extension
 --
 getmetatable("").__mod = function(a, b)
+       local ok, res
+
        if not b then
                return a
        elseif type(b) == "table" then
+               local k, _
                for k, _ in pairs(b) do if type(b[k]) == "userdata" then b[k] = tostring(b[k]) end end
-               return a:format(unpack(b))
+
+               ok, res = pcall(a.format, a, unpack(b))
+               if not ok then
+                       error(res, 2)
+               end
+               return res
        else
                if type(b) == "userdata" then b = tostring(b) end
-               return a:format(b)
+
+               ok, res = pcall(a.format, a, b)
+               if not ok then
+                       error(res, 2)
+               end
+               return res
        end
 end
 
@@ -151,6 +164,28 @@ function striptags(value)
        return value and tparser.striptags(tostring(value))
 end
 
+-- for bash, ash and similar shells single-quoted strings are taken
+-- literally except for single quotes (which terminate the string)
+-- (and the exception noted below for dash (-) at the start of a
+-- command line parameter).
+function shellsqescape(value)
+   local res
+   res, _ = string.gsub(value, "'", "'\\''")
+   return res
+end
+
+-- bash, ash and other similar shells interpret a dash (-) at the start
+-- of a command-line parameters as an option indicator regardless of
+-- whether it is inside a single-quoted string.  It must be backlash
+-- escaped to resolve this.  This requires in some funky special-case
+-- handling.  It may actually be a property of the getopt function
+-- rather than the shell proper.
+function shellstartsqescape(value)
+   res, _ = string.gsub(value, "^\-", "\\-")
+   res, _ = string.gsub(res, "^-", "\-")
+   return shellsqescape(value)
+end
+
 -- containing the resulting substrings. The optional max parameter specifies
 -- the number of bytes to process, regardless of the actual length of the given
 -- string. The optional last parameter, regex, specifies whether the separator
@@ -614,6 +649,23 @@ function libpath()
        return require "nixio.fs".dirname(ldebug.__file__)
 end
 
+function checklib(fullpathexe, wantedlib)
+       local fs = require "nixio.fs"
+       local haveldd = fs.access('/usr/bin/ldd')
+       if not haveldd then
+               return false
+       end
+       local libs = exec("/usr/bin/ldd " .. fullpathexe)
+       if not libs then
+               return false
+       end
+       for k, v in ipairs(split(libs)) do
+               if v:find(wantedlib) then
+                       return true
+               end
+       end
+       return false
+end
 
 --
 -- Coroutine safe xpcall and pcall versions modified for Luci