本文是利用sharppcap实现网络包的捕获的小例子，实现了端口监控，数据包捕获等功能，主要用于学习分享。
什么是sharppcap？
sharppcap 是一个.net 环境下的网络包捕获框架，基于著名的 pcap/winpcap 库开发。提供了捕获、注入、分析和构建的功能，适用于 c# 和 vb net 开发语言。
sharppcap有两部分组成：1> sharppcap.dll 负责数据的捕获 2> packetdotnet.dll负责数据包的解析
思路：
通过进程名字获取对应的端口号。
sharppcap获取对应的数据包，通过解析数据包过滤相关的端口。
涉及知识点：
process 获取相关进程信息。
netstat命令：netstat -ano|find "3844" 获取进程对应的端口
sharppcap相关信息：
通过capturedevicelist的静态方法获取设备列表。
通过onpacketarrival事件接收数据包。
通过packetdotnet来解析数据包
效果图下：
sharppcap核心代码：
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/// <summary> /// 开始捕捉 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnstart_click(object sender, eventargs e) { if (this.combdevice.selectedindex > -1) { startcapture(this.combdevice.selectedindex); this.btnstart.enabled = false; this.btnstop.enabled = true; } else { messagebox.show(this,"请选择一个设备","提示",messageboxbuttons.ok); } } /// <summary> /// 停止捕捉 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnstop_click(object sender, eventargs e) { shutdown(); this.btnstop.enabled = false; this.btnstart.enabled = true; } private void startcapture(int itemindex) { packetcount = 0; device = capturedevicelist.instance[itemindex]; packetstrings = new queue<packetwrapper>(); bs = new bindingsource(); dgvdata.datasource = bs; laststatisticsoutput = datetime.now; // start the background thread backgroundthreadstop = false; backgroundthread = new thread(backgroundthread); backgroundthread.start(); // setup background capture device.onpacketarrival += new packetarrivaleventhandler(device_onpacketarrival); device.oncapturestopped += new capturestoppedeventhandler(device_oncapturestopped); device.open(); // tcpdump filter to capture only tcp/ip packets string filter = "ip and tcp"; device.filter = filter; // force an initial statistics update capturestatistics = device.statistics; updatecapturestatistics(); // start the background capture device.startcapture(); btnstop.enabled = true; } /// <summary> /// 设备接收事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void device_onpacketarrival(object sender, captureeventargs e) { // print out periodic statistics about this device var now = datetime.now; var interval = now - laststatisticsoutput; if (interval > new timespan(0, 0, 2)) { console.writeline("device_onpacketarrival: " + e.device.statistics); capturestatistics = e.device.statistics; statisticsuineedsupdate = true; laststatisticsoutput = now; } lock (queuelock) { packetqueue.add(e.packet); } } /// <summary> /// 设备停止事件 /// </summary> /// <param name="sender"></param> /// <param name="status"></param> private void device_oncapturestopped(object sender, capturestoppedeventstatus status) { if (status != capturestoppedeventstatus.completedwithouterror) { messagebox.show("error stopping capture", "error", messageboxbuttons.ok, messageboxicon.error); } } private void updatecapturestatistics() { tlblstatistic.text = string.format("接收包: {0}, 丢弃包: {1}, 接口丢弃包: {2}", capturestatistics.receivedpackets,capturestatistics.droppedpackets, capturestatistics.interfacedroppedpackets); } |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/hsiang/p/7696347.html
