handle_auth_fallback (Mysql)

    # File lib/active_record/vendor/mysql.rb, line 160
      def handle_auth_fallback(pkt, passwd)
        # A packet like this means that we need to send an old-format password
        if pkt.size == 1 and pkt[0] == 254 and
           @server_capabilities & CLIENT_SECURE_CONNECTION != 0 then
          data = scramble(passwd, @scramble_buff, @protocol_version == 9)
          write data + "\0"
          read
        end
      end