代理服务器的研究与实现

代理服务器作为连接Ｉｎｔｅｒｎｅｔ与Ｉｎｔｒａｎｅｔ的桥梁，在实际应用中发挥着极其重要的作用。它可用于多个目的，最基本的功能是连接，此外还包括安全性、缓存、内容过滤、访问控制管理等功能。文中实现了一个代理服务器系统，可代理ＨＴＴＰ，ＦＴＰ，ＴＥＬＮＥＴ，ＳＭＴＰ，ＰＯＰ这五个常用协议，此外还有用户管理和拨号等功能。该系统已完成了一系列功能测试，已在网上运行，能稳定地代理各类Ｉｎｔｅｒｎｅｔ访问服务

Research and Implementation of Proxy Server

As a bridge linking Internet with Intranet, the proxy server plays a the most important role in many actual applications. It can be used for many purposes. The connection is the most basic function. The proxy server also supplies security, contents cache, contents filter, access management and so on. In today's market, the most popular proxy softwares are almost produced by foreign countries, and the products produced by foreign countries do not well adapt to satisfy the requirements of enterprises of inside country. This paper mainly introduces the implementation of a proxy server system. This proxy server system supplies the basic five proxy, HTTP, FTP, TELNET, SMTP, and POP proxies. This proxy server system also includes user management and dial functions.