public async Task ConnectAsync(string hostname, int port, CancellationToken cancellationToken = default(CancellationToken))
{
this._udpClient = new UdpClient(hostname, port);
// Start listening
this._receiveTask = Task.Run(async() =>
{
while (!cancellationToken.IsCancellationRequested)
{
var received = await this._udpClient.ReceiveAsync();
Debug.WriteLine($"Received {received.Buffer.Length} bytes from {received.RemoteEndPoint}");
}
}, cancellationToken);
// Setup default destination of client
this._udpClient.Connect(hostname, port);
// Generate random connection ID
var random = new Random(Environment.TickCount);
var buffer = new byte[sizeof(long)];
random.NextBytes(buffer);
var connectionId = BitConverter.ToUInt64(buffer, 0);
System.Console.WriteLine(connectionId);
var regularPacket = new RegularPacket(connectionId, 1, null);
regularPacket.AddFrame(new StreamFrame(new ClientHandshakeMessage
{
{ MessageTags.PAD, Enumerable.Repeat((byte)0x2d, 666).ToArray() },
{ MessageTags.SNI, hostname },
{ MessageTags.VER, QUIC_VERSION },
{ MessageTags.CCS, new byte[] { 0x7b, 0x26, 0xe9, 0xe7, 0xe4, 0x5c, 0x71, 0xff, 0x01, 0xe8, 0x81, 0x60, 0x92, 0x92, 0x1a, 0xe8 } },
{ MessageTags.MSPC, 100 },
{ MessageTags.UAID, $"QuicDotNet/{Assembly.GetExecutingAssembly().GetName().Version} {System.Environment.OSVersion}" },
{ MessageTags.TCID, 0 },
{ MessageTags.PDMD, "X509" },
{ MessageTags.SRBF, 1048576 },
{ MessageTags.ICSL, 30 },
{ MessageTags.SCLS, 1 },
{ MessageTags.COPT, 1146636614 },
{ MessageTags.IRTT, 9248 },
{ MessageTags.CFCW, 15728640 },
{ MessageTags.SFCW, 6291456 }
}, false, 1, 0));
var bytesToSend = regularPacket.PadAndNullEncrypt();
await this._udpClient.SendAsync(bytesToSend, bytesToSend.Length);
}
public void FreshHello()
{
var connectionId = 15690248817103694251U;
var packet = new RegularPacket(connectionId, 1, null);
Assert.IsNotNull(packet.ConnectionId);
packet.AddFrame(new StreamFrame(ClientHandshakeMessageTest.ClientInchoateGoogleFreshParametersClientMessageFactory.Value, false, 1, 0));
var packetBytes = packet.PadAndNullEncrypt();
Assert.IsNotNull(packet.MessageAuthenticationHash);
Debug.WriteLine("Message authentication hash: " + packet.MessageAuthenticationHash.Select(b => b.ToString("x2")).Aggregate((c, n) => c + " " + n));
Debug.WriteLine(packetBytes.GenerateHexDumpWithASCII());
Assert.AreEqual(PacketLibrary.ClientInchoateGoogleFresh.Length, packetBytes.Length);
// Soft warn
for (var i = 0; i < packetBytes.Length; i++)
{
if (packetBytes[i] != PacketLibrary.ClientInchoateGoogleFresh[i])
{
Debug.WriteLine($"Byte difference at position {i}: generated byte is {packetBytes[i]:x2} but reference byte was {PacketLibrary.ClientInchoateGoogleFresh[i]:x2}");
}
}
// Hard test fail
for (var i = 0; i < packetBytes.Length; i++)
{
Assert.AreEqual(PacketLibrary.ClientInchoateGoogleFresh[i], packetBytes[i], $"Byte difference at position {i}: generated byte is {packetBytes[i]:x2} but reference byte was {PacketLibrary.ClientInchoateGoogleFresh[i]:x2}");
}
// Now try to reverse engineer it to ensure packet parsing works.
AbstractPacketBase rePacket;
AbstractPacketBase.TryParse(packetBytes, out rePacket);
Assert.IsNotNull(rePacket);
Assert.IsInstanceOfType(rePacket, typeof(RegularPacket));
var rp = (RegularPacket)rePacket;
Assert.AreEqual(rp.ConnectionId, packet.ConnectionId.Value);
Assert.AreEqual(rp.Entropy, packet.Entropy);
Assert.AreEqual(rp.FecGroup, packet.FecGroup);
Assert.IsNotNull(rp.MessageAuthenticationHash);
Assert.AreEqual(rp.MessageAuthenticationHash.Sum(b => (int)b), packet.MessageAuthenticationHash.Sum(b => (int)b));
Assert.AreEqual(rp.PacketNumber, packet.PacketNumber);
var rpBytes = rp.ToByteArray();
//Debug.WriteLine(rpBytes.GenerateHexDumpWithASCII());
Assert.AreEqual(packetBytes.Length, rpBytes.Length);
// Soft reverse engineering warn
for (var i = 0; i < packetBytes.Length; i++)
{
if (packetBytes[i] != rpBytes[i])
{
Debug.WriteLine($"Byte difference at position {i}: generated byte is {rpBytes[i]:x2} but reference byte was {packetBytes[i]:x2}");
}
}
// Hard test fail
for (var i = 0; i < packetBytes.Length; i++)
{
Assert.AreEqual(packetBytes[i], rpBytes[i], $"Byte difference at position {i}: generated byte is {rpBytes[i]:x2} but reference byte was {packetBytes[i]:x2}");
}
}
