public async Task ParseBytes()
{
var bytes = new byte[]
{
0x01, 0x13, 0x00, 0x48, 0x21, 0x12, 0xa4, 0x42, 0xee, 0x29,
0xdd, 0x2d, 0x7a, 0xe9, 0x9c, 0xf4, 0x00, 0x82, 0xf2, 0x5e,
0x00, 0x09, 0x00, 0x10, 0x00, 0x00, 0x04, 0x01, 0x55, 0x6e,
0x61, 0x75, 0x74, 0x68, 0x6f, 0x72, 0x69, 0x7a, 0x65, 0x64,
0x00, 0x15, 0x00, 0x10, 0x37, 0x35, 0x64, 0x34, 0x35, 0x34,
0x31, 0x39, 0x63, 0x33, 0x39, 0x33, 0x34, 0x33, 0x66, 0x65,
0x00, 0x14, 0x00, 0x0a, 0x74, 0x77, 0x69, 0x6c, 0x69, 0x6f,
0x2e, 0x63, 0x6f, 0x6d, 0x03, 0x6d, 0x80, 0x22, 0x00, 0x04,
0x4e, 0x6f, 0x6e, 0x65, 0x80, 0x28, 0x00, 0x04, 0x6e, 0x1e,
0x55, 0x49,
};
using (var stream = new MemoryStream(bytes))
{
var response =
(AllocateErrorResponse)await StunMessage.Parse(stream);
Assert.Equal(
new byte[]
{
0xee, 0x29, 0xdd, 0x2d, 0x7a, 0xe9, 0x9c, 0xf4, 0x00, 0x82,
0xf2, 0x5e,
},
response.TransactionId);
Assert.Equal(401, response.ErrorCode);
Assert.Equal("twilio.com", response.Realm);
Assert.Equal(
new byte[]
{
0x37, 0x35, 0x64, 0x34, 0x35, 0x34,
0x31, 0x39, 0x63, 0x33, 0x39, 0x33,
0x34, 0x33, 0x66, 0x65,
},
response.Nonce
);
}
}
private async Task ProcessMessage()
{
NetworkStream stream = _control.GetStream();
while (true)
{
StunMessage message = await StunMessage.Parse(stream);
if (_connectAttempted != null &&
message is ConnectionAttempt attempt)
{
_connectAttempted.SetResult(attempt);
}
else if (_responses.TryGetValue(
message.TransactionId,
out TaskCompletionSource <StunMessage> tcs))
{
tcs.SetResult(message);
_responses.Remove(message.TransactionId);
}
}
}
public async Task ParseBytes()
{
var bytes = new byte[]
{
0x00, 0x1c, 0x00, 0x24, 0x21, 0x12, 0xa4, 0x42, 0x8e, 0x3b,
0x82, 0x73, 0xda, 0x6f, 0xc3, 0xa9, 0x1e, 0x88, 0x8f, 0x0b,
0x00, 0x2a, 0x00, 0x04, 0x21, 0x5a, 0x86, 0x01, 0x00, 0x12,
0x00, 0x08, 0x00, 0x01, 0x60, 0xc6, 0x17, 0x53, 0x9b, 0x96,
0x80, 0x22, 0x00, 0x04, 0x4e, 0x6f, 0x6e, 0x65, 0x80, 0x28,
0x00, 0x04, 0x58, 0x07, 0xfb, 0x8e,
};
using (var stream = new MemoryStream(bytes))
{
var response =
(ConnectionAttempt)await StunMessage.Parse(stream);
Assert.Equal(
new byte[] { 0x21, 0x5a, 0x86, 0x01 },
response.ConnectionId);
}
}
/// <summary>
/// Does STUN transaction. Returns transaction response or null if transaction failed.
/// </summary>
/// <param name="request">STUN message.</param>
/// <param name="socket">Socket to use for send/receive.</param>
/// <param name="remoteEndPoint">Remote end point.</param>
/// <param name="timeout">Timeout in milliseconds.</param>
/// <returns>Returns transaction response or null if transaction failed.</returns>
private static StunMessage DoTransaction(StunMessage request, Socket socket, IPEndPoint remoteEndPoint, int timeout)
{
var requestBytes = request.ToByteData();
var startTime = DateTime.Now;
// Retransmit with 500 ms.
while (startTime.AddMilliseconds(timeout) > DateTime.Now)
{
try
{
socket.SendTo(requestBytes, remoteEndPoint);
// We got response.
if (socket.Poll(500 * 1000, SelectMode.SelectRead))
{
var receiveBuffer = new byte[512];
socket.Receive(receiveBuffer);
// Parse message
var response = new StunMessage();
response.Parse(receiveBuffer);
// Check that transaction ID matches or not response what we want.
if (NetUtils.CompareArray(request.TransactionId, response.TransactionId))
{
return(response);
}
}
}
catch
{
// ignored
}
}
return(null);
}
public async Task <NetworkStream> AcceptRelayedStreamAsync(
CancellationToken cancellationToken = default(CancellationToken))
{
while (true)
{
await EnsureConnection();
ConnectionAttempt attempt =
await _connectionAttempts.DequeueAsync(cancellationToken);
byte[] id = attempt.ConnectionId;
var bindRequest = new ConnectionBindRequest(id);
var relayedClient = new TcpClient(_host, _port);
NetworkStream relayedStream = relayedClient.GetStream();
try
{
await SendMessageAsync(relayedStream, bindRequest, cancellationToken);
StunMessage bindResponse = await StunMessage.Parse(relayedStream);
if (bindResponse is ConnectionBindSuccessResponse)
{
_relayedClients.Add(relayedClient);
return(relayedStream);
}
throw new TurnClientException("ConnectionBind failed.", bindResponse);
}
catch (IOException e)
{
Log.Warning(e, "The connection seems to disconnect before parsing; ignored.");
continue;
}
}
}
public async Task <bool> IsConnectable(
CancellationToken cancellationToken = default(CancellationToken))
{
try
{
using var client = new TcpClient();
#pragma warning disable PC001 // API not supported on all platforms
client.Connect(_host, _port);
#pragma warning restore PC001 // API not supported on all platforms
NetworkStream stream = client.GetStream();
var request = new BindingRequest();
var asBytes = request.Encode(this);
await stream.WriteAsync(asBytes, 0, asBytes.Length, cancellationToken);
await StunMessage.Parse(stream);
return(true);
}
catch (Exception)
{
return(false);
}
}