关键词：网络嗅探器；数据包捕获；数据包分析；原始套接字
Design and Realization of Network Sniffer
Abstract
Along with the development of network technologies and the popularization of network applications, more and more information resources are put on internet. The network security and reliability become important increasingly. Therefore, the demand of the software tools which could analyze, diagnosis and test network performance or security are more and more pressing. Network sniffer has two sides. An attacker can use it to monitor network data, to achieve the purpose for obtaining information illegally, while network managers can use it to capture and analyze the data which transmitted on network. The result of analysis can be used to analyze the network security.
This thesis briefly analyzed the technology of network sniffer, and researched the capture mechanism of network data packets such as winpcap and raw socket. This paper first analyzed the theory and the harm of sniffer, introduced several common sniffers, and then researched the capture technology which used in the intrusion detection system. The thesis uses raw sockets on windows platform to realize one sniffer which can complete unpack and analyze data packet.
Key words: network sniffer; capture data packet; analyze data capture; raw sockets
