https://ctf.org.cn/2019/03/10/%E4%B9%8B%E5%89%8D%E7%9A%84/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BD%91%E7%BB%9C%E8%87%AA%E9%A1%B6%E5%90%91%E4%B8%8B-%E5%BA%94%E7%94%A8%E5%B1%82%E5%8F%8A%E4%B9%A6%E5%90%8E%E5%A5%97%E6%8E%A5%E5%AD%97%E7%BC%96%E7%A8%8B%E7%BB%83%E4%B9%A0%E5%8F%82%E8%80%83/
计算机网络自顶向下-应用层及书后套接字编程练习参考