Disassembling existing HTTP server scanner modules

Let's work with a simple module that we used previously, that is, the HTTP version scanner and see how it works. The path to this Metasploit module is /modules/auxiliary/scanner/http/http_version.rb.

Let's examine this module systematically:

# This file is part of the Metasploit Framework and may be subject to 
# redistribution and commercial restrictions. Please see the Metasploit 
# website for more information on licensing and terms of use. 
# http://metasploit.com/ 
require 'rex/proto/http' 
require 'msf/core' 
class Metasploit3 < Msf::Auxiliary

Let's discuss how things are arranged here. The copyright lines starting with the # symbol are the comments and they are included in all Metasploit modules. The required 'rex/proto/http' statement asks the interpreter to include a path to all the HTTP protocol methods from the rex library. Therefore, the path to all the files from the /lib/rex/proto/http directory is now available to the module...