private async Task _SendAlertAsync(TAlertLevel alertLevel, TAlertDescription alertDescription, TimeSpan timeout)
{
if (this._Socket == null)
{
throw new Exception("Soket Cannot be Null");
}
var record = new DTLSRecord
{
RecordType = TRecordType.Alert,
Epoch = _Epoch,
SequenceNumber = this._NextSequenceNumber(),
Version = this._Version
};
var sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
var data = new byte[2];
data[0] = (byte)alertLevel;
data[1] = (byte)alertDescription;
record.Fragment = this._Cipher == null ? data : this._Cipher.EncodePlaintext(sequenceNumber, (byte)TRecordType.ApplicationData, data, 0, data.Length);
var recordSize = DTLSRecord.RECORD_OVERHEAD + record.Fragment.Length;
var recordBytes = new byte[recordSize];
using (var stream = new MemoryStream(recordBytes))
{
record.Serialise(stream);
}
await this._Socket.SendAsync(recordBytes, timeout).ConfigureAwait(false);
}
private void SendAlert(TAlertLevel alertLevel, TAlertDescription alertDescription)
{
DTLSRecord record = new DTLSRecord
{
RecordType = TRecordType.Alert,
Epoch = _Epoch,
SequenceNumber = NextSequenceNumber()
};
if (_Version != null)
{
record.Version = _Version;
}
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
byte[] data = new byte[2];
data[0] = (byte)alertLevel;
data[1] = (byte)alertDescription;
if (_Cipher == null)
{
record.Fragment = data;
}
else
{
record.Fragment = _Cipher.EncodePlaintext(sequenceNumber, (byte)TRecordType.ApplicationData, data, 0, data.Length);
}
int responseSize = DTLSRecord.RECORD_OVERHEAD + record.Fragment.Length;
byte[] response = new byte[responseSize];
using (MemoryStream stream = new MemoryStream(response))
{
record.Serialise(stream);
}
SocketAsyncEventArgs parameters = new SocketAsyncEventArgs()
{
RemoteEndPoint = _ServerEndPoint
};
parameters.SetBuffer(response, 0, responseSize);
_Socket.SendToAsync(parameters);
}
private async Task _SendAlertAsync(TAlertLevel alertLevel, TAlertDescription alertDescription) => await this._SendAlertAsync(alertLevel, alertDescription, TimeSpan.FromSeconds(1)).ConfigureAwait(false);
private void SendAlert(TAlertLevel alertLevel, TAlertDescription alertDescription)
{
DTLSRecord record = new DTLSRecord();
record.RecordType = TRecordType.Alert;
record.Epoch = _Epoch;
record.SequenceNumber = NextSequenceNumber();
if (_Version != null)
record.Version = _Version;
long sequenceNumber = ((long)record.Epoch << 48) + record.SequenceNumber;
byte[] data = new byte[2];
data[0] = (byte)alertLevel;
data[1] = (byte)alertDescription;
if (_Cipher == null)
record.Fragment = data;
else
record.Fragment = _Cipher.EncodePlaintext(sequenceNumber, (byte)TRecordType.ApplicationData, data, 0, data.Length);
int responseSize = DTLSRecord.RECORD_OVERHEAD + record.Fragment.Length;
byte[] response = new byte[responseSize];
using (MemoryStream stream = new MemoryStream(response))
{
record.Serialise(stream);
}
SocketAsyncEventArgs parameters = new SocketAsyncEventArgs()
{
RemoteEndPoint = _ServerEndPoint
};
parameters.SetBuffer(response, 0, responseSize);
_Socket.SendToAsync(parameters);
}
