[framework] using hex strings as options

[Alok Menghrajani]

Hi,

Let's imagine our exploit hard codes the addresses of LoadLibrary and
GetProcAddress...

	'Offsets' => {
		'LOADLIBRARY' => [ 16, 'HEX' ],
		'GETPROCADDRESS' => [ 33, 'HEX' ],
	},

	register_options([
		OptString.new('LOADLIBRARY', [ true,
			"Address of LoadLibraryA", "0x7C801D77" ]),
		OptString.new('GETPROCADDRESS', [ true,
			"Address of GetProcAddress", "0x7C80AC28"])
	], Msf::Payloads::Singles::Windows::AlokSample)


It would be convenient if I could use hex strings in my options (so I
can easily edit them with the console).So far, the only clean way I have
found is the following:

	def replace_var(raw, name, offset, pack)
		if pack == "HEX"
			val = datastore[name]
			val = val.to_s.hex
			val = [ val.to_i ].pack("V")
			raw[offset, val.length] = val
			return true
		else
			return false
		end
	end


Is this the right way to do things ? If yes, shouldn't this little piece
of code be included in the payload.rb file ?

Thanks for your feedback,
Alok.