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: packet.rb
    path of file: ./repos/metasploit-framework/lib/rex/proto/proxy/socks5
    
    the code of the file until where you have to start completion: # -*- coding: binary -*-

require 'bindata'
require 'rex/socket'

module Rex
m
    
    def address_length
      case address_type
        when ADDRESS_TYPE_IPV4
          4
        when ADDRESS_TYPE_DOMAINNAME
          domainname_length
        when ADDRESS_TYPE_IPV6
          16
        else
          0
      end