| BSD包过滤器(BPF)的研究与改进 |
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| 引用本文： | 王汉江,朱淼良,郭晔.BSD包过滤器(BPF)的研究与改进[J].计算机工程与应用,2004,40(35):106-108,115. |
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| 作者姓名： | 王汉江 朱淼良 郭晔 |
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| 作者单位： | 浙江大学计算机学院,杭州,310027 |
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| 摘 要： | BSD包过滤器(BSDPacketFilter,简称BPF)位于BSDUnix的内核中,它独立于TCP/IP协议栈,为应用程序访问数据链路层提供了一个原始接口,被广泛地运用在网络监控及其它软件中,如tcpdump。论文对BPF进行了研究,并对其在以太网卡被设置成混杂模式时存在的问题,在FreeBSD4.7上进行了改进,从而也使BPF为应用程序提供了一个更友好的接口。
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| 关 键 词： | BPF 过滤器虚拟机 BPF编程 数据链路层访问 以太网卡混杂模式 |
| 文章编号： | 1002-8331-(2004)35-0106-03 |
Research and Improvement of BSD Packet Filter(BPF) |
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| Wang Hanjiang Zhu Miaoliang Guo Ye.Research and Improvement of BSD Packet Filter(BPF)[J].Computer Engineering and Applications,2004,40(35):106-108,115. |
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| Authors: | Wang Hanjiang Zhu Miaoliang Guo Ye |
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| Abstract: | BSD Packet Filter(BPF)lies in the kernel of BSD Unix,it is independent of the TCP/IP stack,and gives user mode processes a raw interface to access data link layer.It has been widely used in network monitors and other softwares,such as tcpdump.This paper includes a research of BPF,and a solution of a BPF's problem which exists when the Ethernet card is set into promiscuous mode,and the solution has been implemented on FreeBSD4.7.As a result,it also makes BPF provide a better interface to application program. |
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| Keywords: | BPF filter pseudo-machine BPF programming access of data link layer promiscuous mode of Ethernet card |
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