基于socket编程的通信，基于tcp协议的客户端和服务器可执行程序，并均有源码，注释详细，适合初学者学习使用，高手勿喷-Communication based on socket programming, based on the the tcp protocol client and server executable program and have the source code, detailed notes, suitable for beginners to learn to us

PF PACKET包的socket编程，里面包含了包过滤功能的相关代码。代码中包含了已编译好的可执行文件，可以在linux环境中直接使用。-The PF PACKET package socket programming, which contains the relevant code for packet filtering. The code contains a pre-compiled executable file, can be used directly in the Linux

DNSmasq的源码包,里面有大量源码可供参考,可自行编译得到可执行文件dnsmasq,不过配置文件得自己书写.-DNSmasq source code package, there are a large number of source code for reference, can be self compiled executable file dnsmasq, but the configuration file to write their own.