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在做大学最后的毕业设计了,无线局域网络远程安全监控策略
那么抓包是这个系统设计的基础
以前一直都是知道用winpcap的,现在网上搜了一下,有用C#封装好了的,很好用
下面是其中的几个用法
这个类库作者的主页:http://www.tamirgal.com/home/default.aspx
PcapOpen()有下面几个方法
promiscuous_mode:在普通的抓取模式下,我们只抓取那些目的地为目标网络的包,而处于promiscuous_mode时,则抓取所有的包,包括转发的包.通常我们都是开启这种模式的
下面是示例:
//Extract a device from the list PcapDevice device = devices[i]; //Register our handler function to the //‘packet arrival‘ event device.PcapOnPacketArrival += new SharpPcap.PacketArrivalEvent(device_PcapOnPacketArrival); //Open the device for capturing //true -- means promiscuous mode //1000 -- means a read wait of 1000ms device.PcapOpen(true, 1000); Console.WriteLine( "-- Listenning on {0}, hit ‘Enter‘ to stop...", device.PcapDescription); //Start the capturing process device.PcapStartCapture(); //Wait for ‘Enter‘ from the user. Console.ReadLine(); //Stop the capturing process device.PcapStopCapture(); //Close the pcap device device.PcapClose();
PcapStartCapture()对应PcapStopCapture()
使用PcapCapture(int packetCount)时我们可以使用SharpPcap.INFINITE,来达到持续抓包的功能
Note:通常CRC的数据是不在数据包的中的,因为通常错误的CRC包会被自动丢弃.
上面的需要注册一个event handle,这在很多时候是不可行的,所以我们推荐使用下面这个方法PcapGetNextPacket()
//Extract a device from the list PcapDevice device = devices[i]; //Open the device for capturing //true -- means promiscuous mode //1000 -- means a read wait of 1000ms device.PcapOpen(true, 1000); Console.WriteLine(); Console.WriteLine("-- Listenning on {0}...", device.PcapDescription); Packet packet = null; //Keep capture packets using PcapGetNextPacket() while( (packet=device.PcapGetNextPacket()) != null ) { // Prints the time and length of each received packet DateTime time = packet.PcapHeader.Date; int len = packet.PcapHeader.PacketLength; Console.WriteLine("{0}:{1}:{2},{3} Len={4}", time.Hour, time.Minute, time.Second, time.Millisecond, len); } //Close the pcap device device.PcapClose(); Console.WriteLine("-- Capture stopped, device closed.");
PcapSetFilter() 设置过滤条件
string filter = "ip and tcp";
device.PcapSetFilter( filter );
下面这个例子通过抓取TCP包,输出他们的时间,长度,源IP,源端口,目的IP,目的端口
/// <SUMMARY> /// Prints the time, length, src ip, /// src port, dst ip and dst port /// for each TCP/IP packet received on the network /// </SUMMARY> private static void device_PcapOnPacketArrival( object sender, Packet packet) { if(packet is TCPPacket) { DateTime time = packet.Timeval.Date; int len = packet.PcapHeader.len; TCPPacket tcp = (TCPPacket)packet; string srcIp = tcp.SourceAddress; string dstIp = tcp.DestinationAddress; int srcPort = tcp.SourcePort; int dstPort = tcp.DestinationPort; Console.WriteLine("{0}:{1}:{2}, {3} Len={4} {5}:{6} -> {7}:{8}", time.Hour, time.Minute, time.Second, time.Millisecond, len, srcIp, srcPort, dstIp, dstPort); } }
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原文地址：http://www.cnblogs.com/milest/p/4791119.html
