module Sockit
  module V5
    module Support

      # 0x00 = request granted
      # 0x01 = general failure
      # 0x02 = connection not allowed by ruleset
      # 0x03 = network unreachable
      # 0x04 = host unreachable
      # 0x05 = connection refused by destination host
      # 0x06 = TTL expired
      # 0x07 = command not supported / protocol error
      # 0x08 = address type not supported
      def build_v5_result_code_message(result_code)
        message = case result_code
        when 0x00 then
          "Request granted"
        when 0x01 then
          "General failure"
        when 0x02 then
          "Connection not allowed by ruleset"
        when 0x03 then
          "Network unreachable"
        when 0x04 then
          "Host unreachable"
        when 0x05 then
          "Connection refused by destination host"
        when 0x06 then
          "TTL expired"
        when 0x07 then
          "Command not supported / Protocol error"
        when 0x08 then
          "Address type not supported"
        else
          "Unknown"
        end

        "%s (Code: 0x%02X)" % [message, result_code]

      rescue
        "Result Code: #{result_code.inspect}"
      end

      # The authentication methods supported are numbered as follows:
      # 0x00: No authentication
      # 0x01: GSSAPI[10]
      # 0x02: Username/Password[11]
      # 0x03-0x7F: methods assigned by IANA[12]
      # 0x80-0xFE: methods reserved for private use
      def authentication_method(auth_method)
        case auth_method
        when 0x00 then
          "No authentication (Code: 0x%02X)" % auth_method
        when 0x01 then
          "GSSAPI authentication (Code: 0x%02X)" % auth_method
        when 0x02 then
          "Username/Password authentication (Code: 0x%02X)" % auth_method
        when 0x03..0x7F then
          "Authentication method assigned by IANA (Code: 0x%02X)" % auth_method
        when 0x80..0xFE then
          "Authentication method reserved for private use (Code: 0x%02X)" % auth_method
        when 0xFF then
          "Unsupported authentication (Code: 0x%02X)" % auth_method
        else
          "Unknown authentication (Code: 0x%02X)" % auth_method
        end
      end

      # 0x00 = success
      # any other value = failure, connection must be closed
      def authentication_status(auth_status)
        case auth_status
        when 0x00 then
          "Authentication success (Code: 0x%02X)" % auth_status
        else
          "Authentication failure (Code: 0x%02X)" % auth_status
        end
      end

    end
  end
end