private bool ResendPackages(IEnumerable <OutgoingPacket> packetList)
{
var now = Util.Now;
foreach (var outgoingPacket in packetList)
{
// Check if the packet timed out completely
if (outgoingPacket.FirstSendTime < now - PacketTimeout)
{
ColorDbg.WriteResend(outgoingPacket, "TIMEOUT");
return(true);
}
// Check if we should retransmit a packet because it probably got lost
if (outgoingPacket.LastSendTime < now - currentRto)
{
ColorDbg.WriteResend(outgoingPacket, "RESEND");
currentRto = currentRto + currentRto;
if (currentRto > MaxRetryInterval)
{
currentRto = MaxRetryInterval;
}
SendRaw(outgoingPacket);
}
}
return(false);
}
private void AddOutgoingPacket(OutgoingPacket packet, PacketFlags flags = PacketFlags.None)
{
lock (sendLoopLock)
{
var ids = GetPacketCounter(packet.PacketType);
if (ts3Crypt.CryptoInitComplete)
{
IncPacketCounter(packet.PacketType);
}
packet.PacketId = ids.Id;
packet.GenerationId = ids.Generation;
packet.ClientId = ClientId;
packet.PacketFlags |= flags;
switch (packet.PacketType)
{
case PacketType.Voice:
case PacketType.VoiceWhisper:
packet.PacketFlags |= PacketFlags.Unencrypted;
NetUtil.H2N(packet.PacketId, packet.Data, 0);
break;
case PacketType.Command:
case PacketType.CommandLow:
packet.PacketFlags |= PacketFlags.Newprotocol;
packetAckManager.Add(packet.PacketId, packet);
break;
case PacketType.Ping:
lastSentPingId = packet.PacketId;
packet.PacketFlags |= PacketFlags.Unencrypted;
break;
case PacketType.Pong:
packet.PacketFlags |= PacketFlags.Unencrypted;
break;
case PacketType.Ack:
case PacketType.AckLow:
break; // Nothing to do
case PacketType.Init1:
packet.PacketFlags |= PacketFlags.Unencrypted;
packetAckManager.Add(packet.PacketId, packet);
break;
default: throw Util.UnhandledDefault(packet.PacketType);
}
ColorDbg.WritePkgOut(packet);
ts3Crypt.Encrypt(packet);
packet.FirstSendTime = Util.Now;
SendRaw(packet);
}
}
public void ReceiveInitAck()
{
// this method is a bit hacky since it removes ALL Init1 packets
// from the sendQueue instead of the one with the preceding
// init step id (see Ts3Crypt.ProcessInit1).
// But usually this should be no problem since the init order is linear
lock (sendLoopLock)
{
ColorDbg.WriteDetail("Cleaned Inits", "INIT");
var remPacket = packetAckManager.Values.Where(x => x.PacketType == PacketType.Init1).ToArray();
foreach (var packet in remPacket)
{
packetAckManager.Remove(packet.PacketId);
}
}
}
private void UpdateRto(TimeSpan sampleRtt)
{
// Timeout calculation (see: https://tools.ietf.org/html/rfc6298)
// SRTT_{i+1} = (1-a) * SRTT_i + a * RTT
// DevRTT_{i+1} = (1-b) * DevRTT_i + b * | RTT - SRTT_{i+1} |
// Timeout_{i+1} = SRTT_{i+1} + max(ClockRes, 4 * DevRTT_{i+1})
if (smoothedRtt < TimeSpan.Zero)
{
smoothedRtt = sampleRtt;
}
else
{
smoothedRtt = TimeSpan.FromTicks((long)((1 - AlphaSmooth) * smoothedRtt.Ticks + AlphaSmooth * sampleRtt.Ticks));
}
smoothedRttVar = TimeSpan.FromTicks((long)((1 - BetaSmooth) * smoothedRttVar.Ticks + BetaSmooth * Math.Abs(sampleRtt.Ticks - smoothedRtt.Ticks)));
currentRto = smoothedRtt + Util.Max(ClockResolution, TimeSpan.FromTicks(4 * smoothedRttVar.Ticks));
ColorDbg.WriteRtt(smoothedRtt, smoothedRttVar, currentRto);
}
public IncomingPacket FetchPacket()
{
while (true)
{
if (Closed)
{
return(null);
}
if (TryFetchPacket(receiveQueue, out var packet))
{
return(packet);
}
if (TryFetchPacket(receiveQueueLow, out packet))
{
return(packet);
}
var dummy = new IPEndPoint(IPAddress.Any, 0);
byte[] buffer;
try { buffer = udpClient.Receive(ref dummy); }
catch (IOException) { return(null); }
catch (SocketException) { return(null); }
if (dummy.Address.Equals(remoteAddress.Address) && dummy.Port != remoteAddress.Port)
{
continue;
}
packet = Ts3Crypt.GetIncommingPacket(buffer);
// Invalid packet, ignore
if (packet == null)
{
ColorDbg.WritePkgRaw(buffer, "DROPPING");
continue;
}
GenerateGenerationId(packet);
if (!ts3Crypt.Decrypt(packet))
{
continue;
}
NetworkStats.LogInPacket(packet);
ColorDbg.WritePkgIn(packet);
switch (packet.PacketType)
{
case PacketType.Voice: break;
case PacketType.VoiceWhisper: break;
case PacketType.Command: packet = ReceiveCommand(packet, receiveQueue, PacketType.Ack); break;
case PacketType.CommandLow: packet = ReceiveCommand(packet, receiveQueueLow, PacketType.AckLow); break;
case PacketType.Ping: ReceivePing(packet); break;
case PacketType.Pong: ReceivePong(packet); break;
case PacketType.Ack: packet = ReceiveAck(packet); break;
case PacketType.AckLow: break;
case PacketType.Init1: ReceiveInitAck(); break;
default: throw Util.UnhandledDefault(packet.PacketType);
}
if (packet != null)
{
return(packet);
}
}
}
