互联网论坛监测系统的设计与实现

包括论文,设计,论文字数:13121,页数:30

摘   要
互联网发展迅速，网络论坛也随之发展起来。它在给人们带来了诸多方便的同时也产生了诸如传播色情暴力、发表反动言论和泄漏技术机密等一系列严重的问题。因此人们对网络论坛内容监测的需求已经迫在眉睫，而对它的深入分析和研究就更具有极为重要的意义。
本文介绍了网络基础知识、网络监测和过滤的原理以及数据从客户端传到服务器端的方式。分析了互联网论坛监测系统的目的、系统的组成原理和系统的功能模块。其主要模块包括包捕获模块、解码模块、模式匹配模块。它还提出了利用以太网的广播特性，在共享式网络环境下使用BPF技术来获取传输中的信息。系统在Linux操作系统下，调用Libpcap库函数来实现抓包，对包中的内容进行分析，找出有害的信息，从而实现过滤功能。利用文中介绍的方法来构建监测系统，能起到一定的监测作用。

关键词：论坛监测；抓包；过滤；伯克利数据包过滤器

             
                          
Design and Implementation of the Internet              Forum Detective System
Abstract
As the internet has been developing rapidly, the internet forum has brought many convenient to the people. But at the same time, it also has been having a series of questions, such as spreads the pornography, declares the reactionary opinion, divulges the secret of technology, etc. Therefore the requirement of the Internet forum detective system has been stared in the face, and thorough analysis for the system has the extremely vital significance.
The thesis introduces the base knowledge of network, the principle of the network detecting and filter. Pointed out a method of how the data transport from the customer to the server. The thesis has analyzed the goal of internet forum detective system, the principle of system composition and the function module. The important module includes the module of capture package, module of decode, module of matching. The system proposes the broadcast characteristic of Ethernet, using the BPF technology to gain the network information in the common network environment.                    The system has base on Linux operation system, transferring a libpcap storeroom function to grasp the package, analyzing the content of the package and finding the bad message in order to realize the function of filter. The thesis uses the method which was referred just now to construct the system detective, and it realizes some of its functions.

Key words: The forum detecting; Libpcap; filter; BPF

目    录

1引 言 1
1.1课题背景 1
1.2本课题研究的意义 1
1.3本课题的研究方向 1
2网络监测和过滤技术 1
2.1网络监测技术简介 2
2.2包捕获 3
2.2.1利用以太网的广播特性进行包捕获 3
2.3包过滤 3
3系统需求分析 4
3.1互联网论坛监测的产生 4
3.2论坛内容监测系统的总体目标 4
3.2.1系统所需的环境配置 5
3.2.2系统的流程图 6
3.3系统功能分析 6
4论坛监测软件设计的总体方案 9
4.1论坛监测软件主要功能 9
4.2论坛监测系统功能模块的描述 10
5论坛监测软件的实现 12
5.1运行环境和操作系统选择 12
5.2系统对软硬件配置的要求 12
5.3预期成果 12
5.4软件模块的实现 12
5.5论坛监测软件的对象关系图 16
5.6论坛监测的关键代码 16
6结果测试，性能分析 20
6.1测试指标： 20
6.2测试环境 20
6.3监测计算机处于局域网内部 20
6.3.1用户机和目标论坛配置 21
6.3.2 网关的配置 21
6.3.3 测试方法与结果 21
6.4监测计算机处于外部网络 21
6.4.1用户机和目标论坛配置 22
6.4.2网关的配置 22
6.4.3测试方法与结果 22
结    论 23
参考文献 23
致    谢 24
声    明 25

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