public void GetNetworkTime()
{
if (SyncedTime != null)
{
return;
}
var ntpData = new byte[48];
//LeapIndicator = 0 (no warning)
//VersionNum = 3
//Mode = 3 (Client Mode)
ntpData[0] = 0x1B;
//send
_socket.SendTo(ntpData, _ntpEndPoint);
//receive
NetEndPoint endPoint = new NetEndPoint(ConnectionAddressType.IPv4, 0);
int errorCode = 0;
if (_socket.ReceiveFrom(ref ntpData, ref endPoint, ref errorCode) > 0 && endPoint.Equals(_ntpEndPoint))
{
ulong intPart = (ulong)ntpData[40] << 24 | (ulong)ntpData[41] << 16 | (ulong)ntpData[42] << 8 | (ulong)ntpData[43];
ulong fractPart = (ulong)ntpData[44] << 24 | (ulong)ntpData[45] << 16 | (ulong)ntpData[46] << 8 | (ulong)ntpData[47];
var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L);
SyncedTime = (new DateTime(1900, 1, 1)).AddMilliseconds((long)milliseconds);
}
}
private void ReceiveLogic()
{
while (_running)
{
int errorCode = 0;
//Receive some info
byte[] reusableBuffer = null;
int result = _socket.ReceiveFrom(ref reusableBuffer, ref _remoteEndPoint, ref errorCode);
if (result > 0)
{
#if DEBUG
bool receivePacket = true;
if (SimulatePacketLoss && _randomGenerator.Next(100 / SimulationPacketLossChance) == 0)
{
receivePacket = false;
}
else if (SimulateLatency)
{
int latency = _randomGenerator.Next(SimulationMaxLatency);
if (latency > 5)
{
byte[] holdedData = new byte[result];
Buffer.BlockCopy(reusableBuffer, 0, holdedData, 0, result);
_pingSimulationList.AddFirst(new IncomingData
{
Data = holdedData, EndPoint = _remoteEndPoint, TimeWhenGet = DateTime.UtcNow.AddMilliseconds(latency)
});
receivePacket = false;
}
}
if (receivePacket) //DataReceived
#endif
//ProcessEvents
DataReceived(reusableBuffer, result, _remoteEndPoint);
}
else if (result < 0)
{
//10054 - remote close (not error)
//10040 - message too long (impossible now)
if (errorCode != 10054)
{
NetUtils.DebugWrite(ConsoleColor.Red, "(NB)Socket error!");
ProcessError("Receive socket error: " + errorCode);
Stop();
return;
}
}
#if DEBUG
if (SimulateLatency)
{
var node = _pingSimulationList.First;
var time = DateTime.UtcNow;
while (node != null)
{
var incomingData = node.Value;
if (incomingData.TimeWhenGet <= time)
{
DataReceived(incomingData.Data, incomingData.Data.Length, incomingData.EndPoint);
var nodeToRemove = node;
node = node.Next;
_pingSimulationList.Remove(nodeToRemove);
}
else
{
node = node.Next;
}
}
}
#endif
}
}
