C# 利用SharpPcap实现网络包捕获嗅探

  1         /// <summary>
  2         /// 开始捕捉
  3         </summary>
  4         <param name="sender"></param>
  5         <param name="e"></param>
  6         private void btnStart_Click(object sender,EventArgs e)
  7         {
  8             if (this.combDevice.SelectedIndex > -1)
  9             {
 10                 StartCapture(this.combDevice.SelectedIndex);
 11                 this.btnStart.Enabled = false;
 12                 this.btnStop.Enabled = true 13             }
 14             else {
 15                 MessageBox.Show(this,"请选择一个设备",1)">提示",MessageBoxButtons.OK);
 16  17         }
 18 
 19          20          停止捕捉
 21          22          23          24         void btnStop_Click( 25  26             Shutdown();
 27              28              29  30 
 31         void StartCapture(int itemIndex)
 32  33             packetCount = 0 34             device = CaptureDeviceList.Instance[itemIndex];
 35             packetStrings = new Queue<PacketWrapper>();
 36             bs = new BindingSource();
 37             dgvData.DataSource = bs;
 38             LastStatisticsOutput = DateTime.Now;
 39 
 40             // start the background thread
 41             backgroundThreadStop =  42             backgroundThread =  Thread(BackgroundThread);
 43             backgroundThread.Start();
 44 
 45             
 46              setup background capture
 47             device.OnPacketArrival +=  PacketArrivalEventHandler(device_OnPacketArrival);
 48             device.OnCaptureStopped +=   CaptureStoppedEventHandler(device_OnCaptureStopped);
 49             device.Open();
 50 
 51              tcpdump filter to capture only TCP/IP packets
 52             string filter = ip and tcp 53             device.Filter = filter;
 54 
 55              force an initial statistics update
 56             captureStatistics = device.Statistics;
 57             UpdateCaptureStatistics();
 58 
 59              start the background capture
 60             device.StartCapture();
 61 
 62             btnStop.Enabled =  63  64 
 65          66          设备接收事件
 67          68          69          70         void device_OnPacketArrival( 71  72              print out periodic statistics about this device
 73             var Now = 74             var interval = Now - LastStatisticsOutput;
 75             if (interval > new TimeSpan(0,1)">2))
 76  77                 Console.WriteLine(device_OnPacketArrival: " + e.Device.Statistics);
 78                 captureStatistics = e.Device.Statistics;
 79                 statisticsUiNeedsUpdate =  80                 LastStatisticsOutput = Now;
 81  82             
 83             lock (QueueLock)
 84  85                 PacketQueue.Add(e.Packet);
 86  87  88 
 89          90          设备停止事件
 91          92          93         <param name="status"></param>
 94         void device_OnCaptureStopped( 95  96             if (status != CaptureStoppedEventStatus.CompletedWithoutError)
 97  98                 MessageBox.Show(Error stopping captureError 99 100 101 
102         void UpdateCaptureStatistics()
103 104             tlblStatistic.Text = string.Format(接收包: {0},丢弃包: {1},接口丢弃包: {2}105         }