static private void ReceiveThread(object Param)
{
Logger.WriteLine($"Receive thread started with id {Task.CurrentId}");
SharedObject data = (SharedObject)Param;
while (!data.Ended)
{
data.Socket.ReceiveTimeout = (int)PacketsProps.WAIT_TIME;
try
{
CommunicationPacket p = CommunicationFacade.Receive(data.Socket);
UInt64 currentPoint;
lock (data.CountersLocker)
currentPoint = data.Confirmed;
UInt64 confirmationNumber = CommunicationFacade.ComputeRealNumber(p.ConfirmationNumber, currentPoint, UInt16.MaxValue, (uint)Sizes.WINDOW_SIZE);
UploadRecvPacket recv = new UploadRecvPacket(p.ConnectionNumber, p.Flags, p.Data, confirmationNumber);
lock (data.ArriveQueue)
data.ArriveQueue.Enqueue(recv);
}
catch (SocketException e) when(e.SocketErrorCode == SocketError.TimedOut)
{
}
}
}
static private UploadRecvPacket Validate(UploadRecvPacket p, UInt32 connectionNumber, UInt64 required)
{
if (p.ConnectionNumber != connectionNumber)
{
throw new InvalidPacketException($"Connection number not match, required: {connectionNumber:X} accepted: {p.ConnectionNumber:X}");
}
if (p.Flags > 0 && p.Flags != (byte)Flag.FIN && p.Flags != (byte)Flag.SYN && p.Flags != (byte)Flag.RST)
{
throw new InvalidPacketException($"Invalid packet, obtained {Convert.ToString(p.Flags, 2)}");
}
if (p.Flags == (byte)Flag.RST)
{
throw new CommunicationException();
}
UInt64 i = 0;
UInt64 max = (UInt64)Sizes.WINDOW_PACKETS * 4;
for (i = 0; i < max; i++)
{
if (p.ConfirmationNumber + i * (UInt64)Sizes.MAX_DATA == required || p.ConfirmationNumber + i * (UInt64)Sizes.MAX_DATA == required + (UInt64)Sizes.WINDOW_SIZE)
{
break;
}
}
if (i == max)
{
throw new InvalidPacketNumberException($"Invalid packet serial, min required: {required}, obtained: {p.ConfirmationNumber}");
}
if (p.Flags == (byte)Flag.FIN && p.Data.Length > 0)
{
throw new InvalidPacketException("Packet with FIN contains data");
}
return(p);
}
