利用原始套接字实现网络主机自动发现，即arp协议的实现（RAW_SOCKET）-Using raw socket to automatically discover network hosts, that arp protocol implementation (RAW_SOCKET)

C语言实现的Linux下的抓包工具，功能全面，支持多种协议，如icmp arp udp tcp等。需要libpcap的支持。-C language of the Linux packet capture tools, comprehensive functions, support for multiple protocols, such as ICMP ARP UDP tcp. Need Libpcap support.