/// <summary>
/// Populates the list with devices connected on LAN
/// </summary>
/// <param name="view">UI controls</param>
/// <param name="InterfaceFriendlyName"></param>
public static void StartScan(IView view, string InterfaceFriendlyName)
{
#region initialization
if (capturedevice != null)
{
GatewayCalled = false;
BackgroundScanDisabled = true;
capturedevice.StopCapture();
capturedevice.Close();
capturedevice = null;
}
else
{
ClientList = new Dictionary <IPAddress, PhysicalAddress>();
Main.Devices = new ConcurrentDictionary <IPAddress, Device>();
}
#endregion
//Get list of interfaces
CaptureDeviceList capturedevicelist = CaptureDeviceList.Instance;
//crucial for reflection on any network changes
capturedevicelist.Refresh();
capturedevice = (from devicex in capturedevicelist where ((NpcapDevice)devicex).Interface.FriendlyName == InterfaceFriendlyName select devicex).ToList()[0];
//open device in promiscuous mode with 1000ms timeout
capturedevice.Open(DeviceMode.Promiscuous, 1000);
//Arp filter
capturedevice.Filter = "arp";
IPAddress myipaddress = AppConfiguration.LocalIp;
//Probe for active devices on the network
if (DiscoveryTimer == null)
{
StartDescoveryTimer();
}
#region Retrieving ARP packets floating around and find out the sender's IP and MAC
//Scan duration
long scanduration = 8000;
RawCapture rawcapture = null;
//Main scanning task
ScannerTask = Task.Run(() =>
{
try
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
while ((rawcapture = capturedevice.GetNextPacket()) != null && stopwatch.ElapsedMilliseconds <= scanduration)
{
Packet packet = Packet.ParsePacket(rawcapture.LinkLayerType, rawcapture.Data);
ArpPacket ArpPacket = packet.Extract <ArpPacket>();
if (!ClientList.ContainsKey(ArpPacket.SenderProtocolAddress) && ArpPacket.SenderProtocolAddress.ToString() != "0.0.0.0" && Tools.AreCompatibleIPs(ArpPacket.SenderProtocolAddress, myipaddress, AppConfiguration.NetworkSize))
{
ClientList.Add(ArpPacket.SenderProtocolAddress, ArpPacket.SenderHardwareAddress);
string mac = Tools.GetMACString(ArpPacket.SenderHardwareAddress);
string ip = ArpPacket.SenderProtocolAddress.ToString();
var device = new Device
{
IP = ArpPacket.SenderProtocolAddress,
MAC = PhysicalAddress.Parse(mac.Replace(":", "")),
DeviceName = "Resolving",
ManName = "Getting information...",
DeviceStatus = "Online"
};
//Add device to UI list
view.ListView1.BeginInvoke(new Action(() => { view.ListView1.AddObject(device); }));
//Add device to main device list
_ = Main.Devices.TryAdd(ArpPacket.SenderProtocolAddress, device);
//Get hostname and mac vendor for the current device
_ = Task.Run(async() =>
{
try
{
#region Get Hostname
IPHostEntry hostEntry = await Dns.GetHostEntryAsync(ip);
device.DeviceName = hostEntry?.HostName ?? ip;
#endregion
#region Get MacVendor
var Name = VendorAPI.GetVendorInfo(mac);
device.ManName = (Name is null) ? "" : Name.data.organization_name;
#endregion
view.ListView1.BeginInvoke(new Action(() => { view.ListView1.UpdateObject(device); }));
}
catch (Exception ex)
{
try
{
if (ex is SocketException)
{
var Name = VendorAPI.GetVendorInfo(mac);
device.ManName = (Name is null) ? "" : Name.data.organization_name;
view.ListView1.BeginInvoke(new Action(() =>
{
device.DeviceName = ip;
view.ListView1.UpdateObject(device);
}));
}
else
{
view.MainForm.BeginInvoke(
new Action(() =>
{
device.DeviceName = ip;
device.ManName = "Error";
view.ListView1.UpdateObject(device);
}));
}
}
catch
{
}
}
});
}
int percentageprogress = (int)((float)stopwatch.ElapsedMilliseconds / scanduration * 100);
view.MainForm.BeginInvoke(new Action(() => view.StatusLabel.Text = "Scanning " + percentageprogress + "%"));
}
stopwatch.Stop();
view.MainForm.BeginInvoke(new Action(() => view.StatusLabel.Text = ClientList.Count.ToString() + " device(s) found"));
//Initial scanning is over now we start the background scan.
Main.OperationIsInProgress = false;
//Start passive monitoring
BackgroundScanStart(view);
}
catch
{
//Show an error in the UI in case something went wrong
try
{
view.MainForm.BeginInvoke(new Action(() =>
{
view.StatusLabel.Text = "Error occurred";
view.PictureBox.Image = Properties.Resources.color_error;
}));
}
catch { } //Swallow exception when the user closes the app during the scan operation
}
});
#endregion
}
/// <summary>
/// Actively monitor ARP packets for signs of new clients after the scanner is done. This method should be called from the StartScan method.
/// </summary>
/// <param name="view">UI controls</param>
public static void BackgroundScanStart(IView view)
{
view.MainForm.BeginInvoke(new Action(() => view.StatusLabel.Text = "Starting background scan..."));
BackgroundScanDisabled = false;
IPAddress myipaddress = AppConfiguration.LocalIp;
#region Assign OnPacketArrival event handler and start capturing
capturedevice.OnPacketArrival += (object sender, CaptureEventArgs e) =>
{
if (BackgroundScanDisabled)
{
return;
}
Packet packet = Packet.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);
if (packet == null)
{
return;
}
ArpPacket ArpPacket = packet.Extract <ArpPacket>();
if (!ClientList.ContainsKey(ArpPacket.SenderProtocolAddress) && ArpPacket.SenderProtocolAddress.ToString() != "0.0.0.0" && Tools.AreCompatibleIPs(ArpPacket.SenderProtocolAddress, myipaddress, AppConfiguration.NetworkSize))
{
ClientList.Add(ArpPacket.SenderProtocolAddress, ArpPacket.SenderHardwareAddress);
view.ListView1.BeginInvoke(new Action(() =>
{
string mac = Tools.GetMACString(ArpPacket.SenderHardwareAddress);
string ip = ArpPacket.SenderProtocolAddress.ToString();
var device = new Device
{
IP = ArpPacket.SenderProtocolAddress,
MAC = PhysicalAddress.Parse(mac.Replace(":", "")),
DeviceName = "Resolving",
ManName = "Getting information...",
DeviceStatus = "Online"
};
//Add device to list
view.ListView1.BeginInvoke(new Action(() => { view.ListView1.AddObject(device); }));
//Add device to main device list
_ = Main.Devices.TryAdd(ArpPacket.SenderProtocolAddress, device);
//Get hostname and mac vendor for the current device
_ = Task.Run(async() =>
{
try
{
#region Get Hostname
IPHostEntry hostEntry = await Dns.GetHostEntryAsync(ip);
device.DeviceName = hostEntry?.HostName ?? ip;
#endregion
#region Get MacVendor
var Name = VendorAPI.GetVendorInfo(mac);
device.ManName = (Name is null) ? "" : Name.data.organization_name;
#endregion
view.ListView1.BeginInvoke(new Action(() => { view.ListView1.UpdateObject(device); }));
}
catch (Exception ex)
{
try
{
if (ex is SocketException)
{
var Name = VendorAPI.GetVendorInfo(mac);
device.ManName = (Name is null) ? "" : Name.data.organization_name;
view.ListView1.BeginInvoke(new Action(() =>
{
device.DeviceName = ip;
view.ListView1.UpdateObject(device);
}));
}
else
{
view.MainForm.BeginInvoke(
new Action(() =>
{
device.DeviceName = ip;
device.ManName = "Error";
view.ListView1.UpdateObject(device);
}));
}
}
catch
{
}
}
});
}));
view.MainForm.BeginInvoke(new Action(() => view.StatusLabel.Text = ClientList.Count + " device(s) found"));
}
else if (ClientList.ContainsKey(ArpPacket.SenderProtocolAddress))
{
foreach (var Device in Main.Devices)
{
if (Device.Key.Equals(ArpPacket.SenderProtocolAddress))
{
Device.Value.TimeSinceLastArp = DateTime.Now;
break;
}
}
}
};
//Start receiving packets
capturedevice.StartCapture();
//Update UI state
view.MainForm.BeginInvoke(new Action(() =>
{
view.PictureBox.Image = NetStalker.Properties.Resources.color_ok;
view.StatusLabel2.Text = "Ready";
view.Tile.Enabled = true;
view.Tile2.Enabled = true;
}));
if (!LoadingBarCalled)
{
CallTheLoadingBar(view);
view.MainForm.BeginInvoke(new Action(() => view.StatusLabel.Text = "Scanning..."));
}
view.MainForm.BeginInvoke(new Action(() => view.StatusLabel.Text = ClientList.Count + " device(s) found"));
#endregion
}