private void btnScan_Click_1(object sender, EventArgs e)
{
if (_hostScanner.IsScanning)
{
_hostScanner.Cancel();
ChangeScanState(ScanState.Cancel);
}
else
{
List <IpV4Address> range;
if (rbtnCustomRange.Checked)
{
try
{
range = NetworkUtilities.GetIpRange(tbIpRange.Text);
}
catch (FormatException)
{
MessageBox.Show("IP range string is invalid.", "Scan Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
else
{
range = _networkInfo.SubnetRange;
}
ChangeScanState(ScanState.Scan);
_hostScanner.Scan(range);
}
}
private NetworkInformation ParseNetworkInformation()
{
var errorMessage = new Action <string, string>((title, msg) => MetroMessageBox.Show(this, msg, title, MessageBoxButtons.OK, MessageBoxIcon.Error, 120));
IpV4Address gatewayIp;
MacAddress gatewayMac;
IpV4Address netmask;
List <IpV4Address> subnetRange;
IntPtr winDivertHandle;
if (_currentInterface == null)
{
errorMessage("Interface Error", "No network interface selected.");
return(null);
}
try
{
gatewayIp = new IpV4Address(tbGatewayIp.Text);
}
catch (Exception)
{
errorMessage("Value Error", "Invalid gateway IP.");
return(null);
}
try
{
gatewayMac = new MacAddress(tbGatewayMac.Text);
}
catch (Exception)
{
errorMessage("Value Error", "Invalid gateway MAC.");
return(null);
}
try
{
netmask = new IpV4Address(tbNetmask.Text);
}
catch (Exception)
{
errorMessage("Value Error", "Invalid netmask.");
return(null);
}
try
{
subnetRange = NetworkUtilities.GetIpRange(string.Format("{0}/{1}", gatewayIp.ToString(), netmask.ToString()));
}
catch (Exception)
{
errorMessage("Value Error", "Invalid netmask.");
return(null);
}
winDivertHandle = WinDivert.WinDivertOpen("true", WinDivertLayer.Forward, 0, WinDivertOpenFlags.None);
if (winDivertHandle == new IntPtr(-1))
{
errorMessage("WinDivert Error", string.Format("WinDivert handle could not be opened.\nError Code: {0}", Marshal.GetLastWin32Error()));
return(null);
}
return(new NetworkInformation()
{
Interface = _currentInterface,
Communicator = _packetCommunicator,
InterfaceAddress = _interfaces[_currentInterface],
GatewayIp = gatewayIp,
GatewayMac = gatewayMac,
Netmask = netmask,
SubnetRange = subnetRange,
WinDivertHandle = winDivertHandle,
});
}