Developing an auxiliary – the FTP scanner module

Let's try and build a simple module. We will write a simple FTP fingerprinting module and see how things work. Let's examine the code for the FTP module:

class MetasploitModule < Msf::Auxiliary 
include Msf::Exploit::Remote::Ftp 
include Msf::Auxiliary::Scanner 
include Msf::Auxiliary::Report
def initialize super(
'Name'	=> 'FTP Version Scanner Customized Module', 
'Description' => 'Detect FTP Version from the Target', 
'Author'	=> 'Nipun Jaswal',
'License'	=>	MSF_LICENSE
)
register_options( [
Opt::RPORT(21),
])
end

We start our code by defining the type of Metasploit module we are going to build. In this case, we are writing an auxiliary module that is very similar to the one we previously worked on. Next, we define the library files we need to include from the core library set, as follows:

We define...