本文是利用sharppcap實現(xiàn)網絡包的捕獲的小例子，實現(xiàn)了端口監(jiān)控，數(shù)據(jù)包捕獲等功能，主要用于學習分享。
什么是sharppcap？
sharppcap 是一個.net 環(huán)境下的網絡包捕獲框架，基于著名的 pcap/winpcap 庫開發(fā)。提供了捕獲、注入、分析和構建的功能，適用于 c# 和 vb net 開發(fā)語言。
sharppcap有兩部分組成：1> sharppcap.dll 負責數(shù)據(jù)的捕獲 2> packetdotnet.dll負責數(shù)據(jù)包的解析
思路：
通過進程名字獲取對應的端口號。
sharppcap獲取對應的數(shù)據(jù)包，通過解析數(shù)據(jù)包過濾相關的端口。
涉及知識點：
process 獲取相關進程信息。
netstat命令：netstat -ano|find "3844" 獲取進程對應的端口
sharppcap相關信息：
通過capturedevicelist的靜態(tài)方法獲取設備列表。
通過onpacketarrival事件接收數(shù)據(jù)包。
通過packetdotnet來解析數(shù)據(jù)包
效果圖下：
sharppcap核心代碼：
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/// <summary> /// 開始捕捉 /// </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,"請選擇一個設備","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> /// 設備接收事件 /// </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> /// 設備停止事件 /// </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}, 丟棄包: {1}, 接口丟棄包: {2}", capturestatistics.receivedpackets,capturestatistics.droppedpackets, capturestatistics.interfacedroppedpackets); } |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://www.cnblogs.com/hsiang/p/7696347.html
