原始套接字的简单实例。 raw socket，即原始套接字，可以接收本机网卡上的数据帧或者数据包,对与监听网络的流量和分析是很有作用的-Simple examples of the original socket. raw socket, that is, the original socket, you can receive the card on the machine fr a me data or data packets to and monitor network t