/// <summary>
/// This scenario replays a single ARP request.
/// </summary>
/// <remarks>The data was copied from a tcpdump trace from running the NAT in Mininet on Pax.</remarks>
static void SetupScenario2(MockFrameController controller)
{
// ARP request
var d = MockUtil.CreateData(ParseHexString("ffffffffffffb2b2c3d4e5f608060001080006040001b2b2c3d4e5f6c0a8010a000000000000c0a80101"), 1);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
}
/// <summary>
/// This scenario replays a TCP handshake between an inside client and an outside server.
/// </summary>
/// <remarks>
/// These frames are intended to be identical to those generated in the run.py script in the both_simple_experiment test folder.
/// The hex strings were obtained by printing the packet data with `str(pkt).encode("HEX")`. This is not a particularly efficient workflow,
/// and a way of running the original `run.py` test script so that the C# code can be debugged and compared with the simulation of the Verilog
/// would certainly be an improvement.
/// </remarks>
static void SetupScenario1(MockFrameController controller)
{
// Syn from client
var d = MockUtil.CreateData(ParseHexString("222233445566b2b2c3d4e5f6080045000028000100004006af22c0a801010a0000043333005000000000000000005002200090b20000"), 1);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
// Syn+Ack from server
d = MockUtil.CreateData(ParseHexString("122233445566a2b2c3d4e5f608004500002800010000400666cb0a0000040a00000100500401000000000000000050122000777d0000"), 0);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
// Ack from client
d = MockUtil.CreateData(ParseHexString("222233445566b2b2c3d4e5f6080045000028000100004006af22c0a801010a0000043333005000000000000000005010200090a40000"), 1);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
// Data from client (could be request)
d = MockUtil.CreateData(ParseHexString("222233445566b2b2c3d4e5f6080045000054000100004006aef6c0a801010a00000433330050000000000000000050002000895b00005065746572207069706572207069636b65642061207065636b206f66207069636b6c65642070657070657273"), 1);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
// Data from server (could be response)
d = MockUtil.CreateData(ParseHexString("122233445566a2b2c3d4e5f6080045000054000100004006669f0a0000040a00000100500401000000000000000050102000dafb000041207065636b206f66207069636b6c65642070657070657273205065746572205069706572207069636b6564"), 0);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
// Fin shutdown from client
d = MockUtil.CreateData(ParseHexString("222233445566b2b2c3d4e5f6080045000028000100004006af22c0a801010a0000043333005000000000000000005011200090a30000"), 1);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
// Fin+Ack from server
d = MockUtil.CreateData(ParseHexString("122233445566a2b2c3d4e5f608004500002800010000400666cb0a0000040a00000100500401000000000000000050112000777e0000"), 0);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
// Ack from client
d = MockUtil.CreateData(ParseHexString("222233445566b2b2c3d4e5f6080045000028000100004006af22c0a801010a0000043333005000000000000000005010200090a40000"), 1);
controller.QueueReceiveFrame(new FrameInfo(d, TimeSpan.Zero));
}
public void packetHandler(object sender, SharpPcap.CaptureEventArgs e)
{
// Start NAT on first call
if (natThread == null)
{
natThread = new System.Threading.Thread(() => NAT.EntryPoint());
natThread.Start();
}
#if DEBUG
Console.WriteLine("RX packet {0:x16}", BitConverter.ToUInt64(e.Packet.Data, 0));
#endif
#if MININET
// Update checksums for mininet testing.
var pkt = Packet.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);
if (pkt.PayloadPacket is IpPacket)
{
var ip = (IPv4Packet)pkt.PayloadPacket;
if (ip.Checksum != ip.CalculateIPChecksum())
{
Console.WriteLine("! IP Checksum incorrect ({0:x4} != {1:x4})", ip.Checksum, ip.CalculateIPChecksum());
}
ip.UpdateIPChecksum();
}
if (pkt.PayloadPacket.PayloadPacket is TcpPacket)
{
var tcp = (TcpPacket)pkt.PayloadPacket.PayloadPacket;
if (tcp.Checksum != tcp.CalculateTCPChecksum())
{
Console.WriteLine("! TCP Checksum incorrect ({0:x4} != {1:x4})", tcp.Checksum, tcp.CalculateTCPChecksum());
}
tcp.UpdateTCPChecksum();
}
#endif
// Create data object (NOTE this involves copy the data)
int intfNumber = PaxConfig.rdeviceMap[e.Device.Name];
var data = MockUtil.CreateData(e.Packet.Data, intfNumber);
// Change endianness
var frame = new FrameInfo(data, TimeSpan.Zero);
//frame.SwapTdataEndianness(); // FIXME this doesn't seem to be needed? Look into ways to avoid copying then
// Queue the frame for processing
NAT.FrameController.QueueReceiveFrame(frame);
}