Raw Socket: 原始套接字，可以用它来发送和接收 IP 层以上的原始数据包, 如 ICMP, TCP, UDP...创建Raw Socket Sniffer嗅探器-Raw Socket: raw sockets, you can use it to send and receive IP layer over the original data packet, such as ICMP, TCP, UDP ... create a Raw Socket Sniffer Sniffer