module Msf

require 'msf/core/exploit/tcp'

###
#
# This module exposes methods that may be useful to exploits that deal with
# servers that speak the POP2 protocol.
#
###
module Exploit::Remote::Pop2

	include Exploit::Remote::Tcp

	#
	# Creates an instance of an POP2 exploit module.
	#
	def initialize(info = {})
		super

		# Register the options that all POP2 exploits may make use of.
		register_options(
			[
				Opt::RHOST,
				Opt::RPORT(109),
				OptString.new('POP2USER', [ false, 'The username to authenticate as']),
				OptString.new('POP2PASS', [ false, 'The password for the specified username'])
			], Msf::Exploit::Remote::Pop2)
	end

	#
	# This method establishes a POP2 connection to host and port specified by
	# the RHOST and RPORT options, respectively.  After connecting, the banner
	# message is read in and stored in the 'banner' attribute.
	#
	def connect(global = true)
		print_status("Connecting to POP2 server #{rhost}:#{rport}...")

		fd = super

		# Wait for a banner to arrive...
		self.banner = fd.get_once

		print_status("Connected to target POP2 server.")
		print_status("Banner: #{self.banner.split("\n")[0].strip}")

		# Return the file descriptor to the caller
		fd
	end

	#
	# Connect and login to the remote POP2 server using the credentials
	# that have been supplied in the exploit options.
	#
	def connect_login(global = true)
		pop2sock = connect(global)


		if !(user and pass)
			print_status("No username and password were supplied, unable to login")
			return false
		end

		print_status("Authenticating as #{user} with password #{pass}...")
		res = raw_send_recv("HELO #{user} #{pass}\r\n")

		if (res !~ /messages/)
			print_status("Authentication failed")
			return false
		end

		print_status("Messages: #{res}")
		return true
	end

	#
	# This method transmits a POP2 command and waits for a response.  If one is
	# received, it is returned to the caller.
	#
	def raw_send_recv(cmd, nsock = self.sock)
		nsock.put(cmd)
		res = nsock.get_once
	end

	#
	# This method sends one command with zero or more parameters
	#
	def send_cmd(args, recv = true, nsock = self.sock)
		cmd = args.join(" ") + "\r\n"
		if (recv)
			return raw_send_recv(cmd, nsock)
		else
			return raw_send(cmd, nsock)
		end
	end

	#
	# This method transmits a FTP command and does not wait for a response
	#
	def raw_send(cmd, nsock = self.sock)
		nsock.put(cmd)
	end

	##
	#
	# Wrappers for getters
	#
	##

	#
	# Returns the user string from the 'POP2USER' option.
	#
	def user
		datastore['POP2USER']
	end

	#
	# Returns the user string from the 'POP2PASS' option.
	#
	def pass
		datastore['POP2PASS']
	end

protected

	#
	# This attribute holds the banner that was read in after a successful call
	# to connect or connect_login.
	#
	attr_accessor :banner

end

end