public void TestUdpTunnel()
{
var nic = TunnelDevice.GetTunnelInterfaces().First();
using var tapDevice = GetTunnelDevice(nic);
// Open TAP device first to ensure the virutal device is connected
tapDevice.Open(DeviceModes.Promiscuous);
var tapIp = IpHelper.GetIPAddress(nic);
using var tester = new UdpTester(tapIp);
tapDevice.Filter = "udp port " + UdpTester.Port;
// Send from OS, and receive in tunnel
var seq1 = new byte[] { 1, 2, 3 };
tester.Broadcast(seq1);
var retval = tapDevice.GetNextPacket(out var p1);
Assert.AreEqual(GetPacketStatus.PacketRead, retval);
tester.AssertMatches(p1.GetPacket().GetPacket(), seq1);
// Send from tunnel, and receive in OS
var seq2 = new byte[] { 4, 5, 6 };
var packet = tester.GetReceivablePacket(seq2);
tapDevice.SendPacket(packet);
retval = tapDevice.GetNextPacket(out var p2);
// TAP don't receive its own traffic
Assert.AreEqual(GetPacketStatus.ReadTimeout, retval);
CollectionAssert.AreEqual(seq2, tester.LastReceivedData);
}
public void TestArpTunnel()
{
var nic = TunnelDevice.GetTunnelInterfaces().First();
using var tapDevice = GetTunnelDevice(nic);
// Open TAP device first to ensure the virutal device is connected
tapDevice.Open(DeviceModes.Promiscuous);
var tapIp = IpHelper.GetIPAddress(nic);
// we need to provide our own IP and MAC, otherwise OS will ignore its own requests
var ipBytes = tapIp.GetAddressBytes();
ipBytes[3]++;
var testIp = new IPAddress(ipBytes);
var testMac = PhysicalAddress.Parse("001122334455");
PhysicalAddress mac = null;
for (int i = 0; i < 5; i++)
{
mac = ARP.Resolve(tapDevice, tapIp, testIp, testMac, TimeSpan.FromSeconds(1));
if (mac != null)
{
break;
}
// Wait for interface to finish Gratuitous ARP
}
Assert.AreEqual(tapDevice.MacAddress, mac);
}
public void TestPcapTapExchange()
{
var nic = TunnelDevice.GetTunnelInterfaces().First();
using var tapDevice = GetTunnelDevice(nic);
// Open TAP device first to ensure the virutal device is connected
tapDevice.Open();
// Wait for interface to be fully up
Thread.Sleep(1000);
var pcapInterface = PcapInterface.GetAllPcapInterfaces()
.First(pIf => pIf.FriendlyName == nic.Name);
using var pcapDevice = new LibPcapLiveDevice(pcapInterface);
PcapDeviceTest.CheckExchange(tapDevice, pcapDevice);
}
public void Properties()
{
var nic = TunnelDevice.GetTunnelInterfaces().First();
using var device = new TunnelDevice(nic);
device.Open();
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
Assert.GreaterOrEqual(device.Version.Major, 9);
}
Assert.IsNotNull(device.Name);
Assert.IsNotNull(device.FriendlyName);
Assert.IsNotNull(device.Description);
Assert.IsNull(device.LastError);
Assert.IsNull(device.Filter);
Assert.AreEqual(LinkLayers.Ethernet, device.LinkType);
Assert.IsNotNull(device.MacAddress);
Assert.AreEqual(TimestampResolution.Microsecond, device.TimestampResolution);
Assert.IsNull(device.Statistics);
}
