internal bool Shutdown(byte[] data, int start, int length, bool force)
{
lock (_shutdownLock)
{
//trying to shutdown already disconnected
if (_connectionState == ConnectionState.Disconnected ||
_connectionState == ConnectionState.ShutdownRequested)
{
return(false);
}
//don't send anything
if (force)
{
_connectionState = ConnectionState.Disconnected;
return(true);
}
//reset time for reconnect protection
_timeSinceLastPacket = 0;
//send shutdown packet
_shutdownPacket = new NetPacket(PacketProperty.Disconnect, length);
_shutdownPacket.ConnectionNumber = _connectNum;
FastBitConverter.GetBytes(_shutdownPacket.RawData, 1, _connectTime);
if (_shutdownPacket.Size >= _mtu)
{
//Drop additional data
NetDebug.WriteError("[Peer] Disconnect additional data size more than MTU - 8!");
}
else if (data != null && length > 0)
{
Buffer.BlockCopy(data, start, _shutdownPacket.RawData, 9, length);
}
_connectionState = ConnectionState.ShutdownRequested;
NetDebug.Write("[Peer] Send disconnect");
NetManager.SendRaw(_shutdownPacket, EndPoint);
return(true);
}
}
public override void SendNextPackets()
{
if (_mustSendAcks)
{
_mustSendAcks = false;
NetDebug.Write("[RR]SendAcks");
lock (_outgoingAcks)
Peer.SendUserData(_outgoingAcks);
}
long currentTime = DateTime.UtcNow.Ticks;
lock (_pendingPackets)
{
//get packets from queue
lock (OutgoingQueue)
{
while (OutgoingQueue.Count > 0)
{
int relate = NetUtils.RelativeSequenceNumber(_localSeqence, _localWindowStart);
if (relate >= _windowSize)
{
break;
}
var netPacket = OutgoingQueue.Dequeue();
netPacket.Sequence = (ushort)_localSeqence;
netPacket.ChannelId = _id;
_pendingPackets[_localSeqence % _windowSize].Init(netPacket);
_localSeqence = (_localSeqence + 1) % NetConstants.MaxSequence;
}
}
//send
for (int pendingSeq = _localWindowStart; pendingSeq != _localSeqence; pendingSeq = (pendingSeq + 1) % NetConstants.MaxSequence)
{
_pendingPackets[pendingSeq % _windowSize].TrySend(currentTime, Peer);
}
}
}
public NetPeer AcceptIfKey(string key)
{
if (!TryActivate())
{
return(null);
}
try
{
if (Data.GetString() == key)
{
Result = ConnectionRequestResult.Accept;
return(_listener.OnConnectionSolved(this, null, 0, 0));
}
}
catch
{
NetDebug.WriteError("[AC] Invalid incoming data");
}
Result = ConnectionRequestResult.Reject;
_listener.OnConnectionSolved(this, null, 0, 0);
return(null);
}
private void HandleNatIntroduction(NetDataReader dr)
{
// read intro
byte hostByte = dr.GetByte();
IPEndPoint remoteInternal = dr.GetNetEndPoint();
IPEndPoint remoteExternal = dr.GetNetEndPoint();
string token = dr.GetString(MaxTokenLength);
NetDebug.Write(NetLogLevel.Trace, "[NAT] introduction received; we are designated " + (hostByte == HostByte ? "host" : "client"));
NetDataWriter writer = new NetDataWriter();
// send internal punch
writer.Put((byte)PacketProperty.NatPunchMessage);
writer.Put(hostByte);
writer.Put(token);
SocketError errorCode = 0;
_socket.SendTo(writer.Data, 0, writer.Length, remoteInternal, ref errorCode);
NetDebug.Write(NetLogLevel.Trace, "[NAT] internal punch sent to " + remoteInternal);
// send external punch
writer.Reset();
writer.Put((byte)PacketProperty.NatPunchMessage);
writer.Put(hostByte);
writer.Put(token);
if (hostByte == HostByte)
{
_socket.Ttl = 2;
_socket.SendTo(writer.Data, 0, writer.Length, remoteExternal, ref errorCode);
_socket.Ttl = NetConstants.SocketTTL;
}
else
{
_socket.SendTo(writer.Data, 0, writer.Length, remoteExternal, ref errorCode);
}
NetDebug.Write(NetLogLevel.Trace, "[NAT] external punch sent to " + remoteExternal);
}
private void HandleNatPunch(IPEndPoint senderEndPoint, NetDataReader dr)
{
byte fromHostByte = dr.GetByte();
if (fromHostByte != HostByte && fromHostByte != ClientByte)
{
//garbage
return;
}
//Read info
string additionalInfo = dr.GetString(MaxTokenLength);
NetDebug.Write(NetLogLevel.Trace, "[NAT] punch received from {0} - additional info: {1}", senderEndPoint, additionalInfo);
//Release punch success to client; enabling him to Connect() to msg.Sender if token is ok
lock (_successEvents)
{
_successEvents.Enqueue(new SuccessEventData {
TargetEndPoint = senderEndPoint, Token = additionalInfo
});
}
}
public int SendTo(byte[] data, int offset, int size, IPEndPoint remoteEndPoint, ref SocketError errorCode)
{
try
{
var socket = _udpSocketv4;
if (remoteEndPoint.AddressFamily == AddressFamily.InterNetworkV6 && IPv6Support)
{
socket = _udpSocketv6;
}
int result = socket.SendTo(data, offset, size, SocketFlags.None, remoteEndPoint);
NetDebug.Write(NetLogLevel.Trace, "[S]Send packet to {0}, result: {1}", remoteEndPoint, result);
return(result);
}
catch (SocketException ex)
{
switch (ex.SocketErrorCode)
{
case SocketError.NoBufferSpaceAvailable:
case SocketError.Interrupted:
return(0);
case SocketError.MessageSize: //do nothing
break;
default:
NetDebug.WriteError("[S]" + ex);
break;
}
errorCode = ex.SocketErrorCode;
return(-1);
}
catch (Exception ex)
{
NetDebug.WriteError("[S]" + ex);
return(-1);
}
}
//Process incoming packet
public override bool ProcessPacket(NetPacket packet)
{
if (packet.Property == PacketProperty.Ack)
{
ProcessAck(packet);
return(false);
}
int seq = packet.Sequence;
if (seq >= NetConstants.MaxSequence)
{
NetDebug.Write("[RR]Bad sequence");
return(false);
}
int relate = NetUtils.RelativeSequenceNumber(seq, _remoteWindowStart);
int relateSeq = NetUtils.RelativeSequenceNumber(seq, _remoteSequence);
if (relateSeq > _windowSize)
{
NetDebug.Write("[RR]Bad sequence");
return(false);
}
//Drop bad packets
if (relate < 0)
{
//Too old packet doesn't ack
NetDebug.Write("[RR]ReliableInOrder too old");
return(false);
}
if (relate >= _windowSize * 2)
{
//Some very new packet
NetDebug.Write("[RR]ReliableInOrder too new");
return(false);
}
//If very new - move window
int ackIdx;
int ackByte;
int ackBit;
lock (_outgoingAcks)
{
if (relate >= _windowSize)
{
//New window position
int newWindowStart = (_remoteWindowStart + relate - _windowSize + 1) % NetConstants.MaxSequence;
_outgoingAcks.Sequence = (ushort)newWindowStart;
//Clean old data
while (_remoteWindowStart != newWindowStart)
{
ackIdx = _remoteWindowStart % _windowSize;
ackByte = NetConstants.ChanneledHeaderSize + ackIdx / BitsInByte;
ackBit = ackIdx % BitsInByte;
_outgoingAcks.RawData[ackByte] &= (byte)~(1 << ackBit);
_remoteWindowStart = (_remoteWindowStart + 1) % NetConstants.MaxSequence;
}
}
//Final stage - process valid packet
//trigger acks send
_mustSendAcks = true;
ackIdx = seq % _windowSize;
ackByte = NetConstants.ChanneledHeaderSize + ackIdx / BitsInByte;
ackBit = ackIdx % BitsInByte;
if ((_outgoingAcks.RawData[ackByte] & (1 << ackBit)) != 0)
{
NetDebug.Write("[RR]ReliableInOrder duplicate");
return(false);
}
//save ack
_outgoingAcks.RawData[ackByte] |= (byte)(1 << ackBit);
}
//detailed check
if (seq == _remoteSequence)
{
NetDebug.Write("[RR]ReliableInOrder packet succes");
Peer.AddIncomingPacket(packet);
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
if (_ordered)
{
NetPacket p;
while ((p = _receivedPackets[_remoteSequence % _windowSize]) != null)
{
//process holded packet
_receivedPackets[_remoteSequence % _windowSize] = null;
Peer.AddIncomingPacket(p);
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
}
}
else
{
while (_earlyReceived[_remoteSequence % _windowSize])
{
//process early packet
_earlyReceived[_remoteSequence % _windowSize] = false;
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
}
}
return(true);
}
//holded packet
if (_ordered)
{
_receivedPackets[ackIdx] = packet;
}
else
{
_earlyReceived[ackIdx] = true;
Peer.AddIncomingPacket(packet);
}
return(true);
}
//ProcessAck in packet
private void ProcessAck(NetPacket packet)
{
if (packet.Size != _outgoingAcks.Size)
{
NetDebug.Write("[PA]Invalid acks packet size");
return;
}
ushort ackWindowStart = packet.Sequence;
int windowRel = NetUtils.RelativeSequenceNumber(_localWindowStart, ackWindowStart);
if (ackWindowStart >= NetConstants.MaxSequence || windowRel < 0)
{
NetDebug.Write("[PA]Bad window start");
return;
}
//check relevance
if (windowRel >= _windowSize)
{
NetDebug.Write("[PA]Old acks");
return;
}
byte[] acksData = packet.RawData;
lock (_pendingPackets)
{
for (int pendingSeq = _localWindowStart;
pendingSeq != _localSeqence;
pendingSeq = (pendingSeq + 1) % NetConstants.MaxSequence)
{
int rel = NetUtils.RelativeSequenceNumber(pendingSeq, ackWindowStart);
if (rel >= _windowSize)
{
NetDebug.Write("[PA]REL: " + rel);
break;
}
int pendingIdx = pendingSeq % _windowSize;
int currentByte = NetConstants.ChanneledHeaderSize + pendingIdx / BitsInByte;
int currentBit = pendingIdx % BitsInByte;
if ((acksData[currentByte] & (1 << currentBit)) == 0)
{
#if STATS_ENABLED || DEBUG
Peer.Statistics.PacketLoss++;
#endif
//Skip false ack
NetDebug.Write("[PA]False ack: {0}", pendingSeq);
continue;
}
if (pendingSeq == _localWindowStart)
{
//Move window
_localWindowStart = (_localWindowStart + 1) % NetConstants.MaxSequence;
}
//clear packet
if (_pendingPackets[pendingIdx].Clear(Peer))
{
NetDebug.Write("[PA]Removing reliableInOrder ack: {0} - true", pendingSeq);
}
}
}
}
private bool BindSocket(Socket socket, IPEndPoint ep, bool reuseAddress)
{
//Setup socket
socket.ReceiveTimeout = 500;
socket.SendTimeout = 500;
socket.ReceiveBufferSize = NetConstants.SocketBufferSize;
socket.SendBufferSize = NetConstants.SocketBufferSize;
#if NETSTANDARD || NETCOREAPP
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
#endif
try
{
socket.IOControl(SioUdpConnreset, new byte[] { 0 }, null);
}
catch
{
//ignored
}
try
{
socket.ExclusiveAddressUse = !reuseAddress;
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, reuseAddress);
}
catch
{
//Unity with IL2CPP throws an exception here, it doesn't matter in most cases so just ignore it
}
if (socket.AddressFamily == AddressFamily.InterNetwork)
{
socket.Ttl = NetConstants.SocketTTL;
#if NETSTANDARD || NETCOREAPP
if (!RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
#endif
try { socket.DontFragment = true; }
catch (SocketException e)
{
NetDebug.WriteError("[B]DontFragment error: {0}", e.SocketErrorCode);
}
try { socket.EnableBroadcast = true; }
catch (SocketException e)
{
NetDebug.WriteError("[B]Broadcast error: {0}", e.SocketErrorCode);
}
}
//Bind
try
{
socket.Bind(ep);
NetDebug.Write(NetLogLevel.Trace, "[B]Successfully binded to port: {0}", ((IPEndPoint)socket.LocalEndPoint).Port);
}
catch (SocketException bindException)
{
switch (bindException.SocketErrorCode)
{
//IPv6 bind fix
case SocketError.AddressAlreadyInUse:
if (socket.AddressFamily == AddressFamily.InterNetworkV6)
{
try
{
socket.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, true);
socket.Bind(ep);
}
catch (SocketException ex)
{
NetDebug.WriteError("[B]Bind exception: {0}, errorCode: {1}", ex.ToString(), ex.SocketErrorCode);
return(false);
}
return(true);
}
break;
//hack for iOS (Unity3D)
case SocketError.AddressFamilyNotSupported:
return(true);
}
NetDebug.WriteError("[B]Bind exception: {0}, errorCode: {1}", bindException.ToString(), bindException.SocketErrorCode);
return(false);
}
return(true);
}
//Process incoming packet
internal void ProcessPacket(NetPacket packet)
{
//not initialized
if (_connectionState == ConnectionState.Outgoing)
{
_packetPool.Recycle(packet);
return;
}
if (packet.ConnectionNumber != _connectNum && packet.Property != PacketProperty.ShutdownOk) //without connectionNum
{
NetDebug.Write(NetLogLevel.Trace, "[RR]Old packet");
_packetPool.Recycle(packet);
return;
}
_timeSinceLastPacket = 0;
NetDebug.Write("[RR]PacketProperty: {0}", packet.Property);
switch (packet.Property)
{
case PacketProperty.Merged:
int pos = NetConstants.HeaderSize;
while (pos < packet.Size)
{
ushort size = BitConverter.ToUInt16(packet.RawData, pos);
pos += 2;
NetPacket mergedPacket = _packetPool.GetPacket(size);
if (!mergedPacket.FromBytes(packet.RawData, pos, size))
{
_packetPool.Recycle(packet);
break;
}
pos += size;
ProcessPacket(mergedPacket);
}
break;
//If we get ping, send pong
case PacketProperty.Ping:
if (NetUtils.RelativeSequenceNumber(packet.Sequence, _pongPacket.Sequence) > 0)
{
NetDebug.Write("[PP]Ping receive, send pong");
FastBitConverter.GetBytes(_pongPacket.RawData, 3, DateTime.UtcNow.Ticks);
_pongPacket.Sequence = packet.Sequence;
NetManager.SendRaw(_pongPacket, EndPoint);
}
_packetPool.Recycle(packet);
break;
//If we get pong, calculate ping time and rtt
case PacketProperty.Pong:
if (packet.Sequence == _pingPacket.Sequence)
{
_pingTimer.Stop();
int elapsedMs = (int)_pingTimer.ElapsedMilliseconds;
_remoteDelta = BitConverter.ToInt64(packet.RawData, 3) + (elapsedMs * TimeSpan.TicksPerMillisecond) / 2 - DateTime.UtcNow.Ticks;
UpdateRoundTripTime(elapsedMs);
NetManager.ConnectionLatencyUpdated(this, elapsedMs / 2);
NetDebug.Write("[PP]Ping: {0} - {1} - {2}", packet.Sequence, elapsedMs, _remoteDelta);
}
_packetPool.Recycle(packet);
break;
case PacketProperty.Ack:
case PacketProperty.Channeled:
if (packet.ChannelId > _channels.Length)
{
_packetPool.Recycle(packet);
break;
}
var channel = _channels[packet.ChannelId] ?? (packet.Property == PacketProperty.Ack ? null : CreateChannel(packet.ChannelId));
if (channel != null)
{
if (!channel.ProcessPacket(packet))
{
_packetPool.Recycle(packet);
}
}
break;
//Simple packet without acks
case PacketProperty.Unreliable:
AddIncomingPacket(packet);
return;
case PacketProperty.MtuCheck:
case PacketProperty.MtuOk:
ProcessMtuPacket(packet);
break;
case PacketProperty.ShutdownOk:
if (_connectionState == ConnectionState.ShutdownRequested)
{
_connectionState = ConnectionState.Disconnected;
}
_packetPool.Recycle(packet);
break;
default:
NetDebug.WriteError("Error! Unexpected packet type: " + packet.Property);
break;
}
}
internal void AddIncomingPacket(NetPacket p)
{
if (p.IsFragmented)
{
NetDebug.Write("Fragment. Id: {0}, Part: {1}, Total: {2}", p.FragmentId, p.FragmentPart, p.FragmentsTotal);
//Get needed array from dictionary
ushort packetFragId = p.FragmentId;
IncomingFragments incomingFragments;
if (!_holdedFragments.TryGetValue(packetFragId, out incomingFragments))
{
incomingFragments = new IncomingFragments
{
Fragments = new NetPacket[p.FragmentsTotal],
ChannelId = p.ChannelId
};
_holdedFragments.Add(packetFragId, incomingFragments);
}
//Cache
var fragments = incomingFragments.Fragments;
//Error check
if (p.FragmentPart >= fragments.Length ||
fragments[p.FragmentPart] != null ||
p.ChannelId != incomingFragments.ChannelId)
{
_packetPool.Recycle(p);
NetDebug.WriteError("Invalid fragment packet");
return;
}
//Fill array
fragments[p.FragmentPart] = p;
//Increase received fragments count
incomingFragments.ReceivedCount++;
//Increase total size
incomingFragments.TotalSize += p.Size - NetConstants.FragmentTotalSize;
//Check for finish
if (incomingFragments.ReceivedCount != fragments.Length)
{
return;
}
int resultingPacketHeaderSize = NetPacket.GetHeaderSize(p.Property);
NetPacket resultingPacket = _packetPool.GetPacket(resultingPacketHeaderSize + incomingFragments.TotalSize);
resultingPacket.Property = p.Property;
resultingPacket.ChannelId = incomingFragments.ChannelId;
int firstFragmentSize = fragments[0].Size - NetConstants.FragmentTotalSize;
for (int i = 0; i < incomingFragments.ReceivedCount; i++)
{
//Create resulting big packet
int fragmentSize = fragments[i].Size - NetConstants.FragmentTotalSize;
Buffer.BlockCopy(
fragments[i].RawData,
NetConstants.FragmentTotalSize,
resultingPacket.RawData,
resultingPacketHeaderSize + firstFragmentSize * i,
fragmentSize);
//Free memory
_packetPool.Recycle(fragments[i]);
fragments[i] = null;
}
//Send to process
NetManager.ReceiveFromPeer(resultingPacket, this);
//Clear memory
_holdedFragments.Remove(packetFragId);
}
else //Just simple packet
{
NetManager.ReceiveFromPeer(p, this);
}
}
private void SendInternal(
byte[] data,
int start,
int length,
byte channelNumber,
DeliveryMethod deliveryMethod,
object userData)
{
if (_connectionState == ConnectionState.ShutdownRequested ||
_connectionState == ConnectionState.Disconnected)
{
return;
}
if (channelNumber >= _channels.Length)
{
return;
}
//Select channel
PacketProperty property;
BaseChannel channel;
if (deliveryMethod == DeliveryMethod.Unreliable)
{
property = PacketProperty.Unreliable;
channel = _unreliableChannel;
}
else
{
property = PacketProperty.Channeled;
channel = CreateChannel((byte)(channelNumber * 4 + (byte)deliveryMethod));
}
//Prepare
NetDebug.Write("[RS]Packet: " + property);
//Check fragmentation
int headerSize = NetPacket.GetHeaderSize(property);
//Save mtu for multithread
int mtu = _mtu;
if (length + headerSize > mtu)
{
//if cannot be fragmented
if (deliveryMethod != DeliveryMethod.ReliableOrdered && deliveryMethod != DeliveryMethod.ReliableUnordered)
{
throw new TooBigPacketException("Unreliable packet size exceeded maximum of " + (mtu - headerSize) + " bytes");
}
int packetFullSize = mtu - headerSize;
int packetDataSize = packetFullSize - NetConstants.FragmentHeaderSize;
int totalPackets = length / packetDataSize + (length % packetDataSize == 0 ? 0 : 1);
NetDebug.Write("FragmentSend:\n" +
" MTU: {0}\n" +
" headerSize: {1}\n" +
" packetFullSize: {2}\n" +
" packetDataSize: {3}\n" +
" totalPackets: {4}",
mtu, headerSize, packetFullSize, packetDataSize, totalPackets);
if (totalPackets > ushort.MaxValue)
{
throw new TooBigPacketException("Data was split in " + totalPackets + " fragments, which exceeds " + ushort.MaxValue);
}
lock (_sendLock)
{
for (ushort partIdx = 0; partIdx < totalPackets; partIdx++)
{
int sendLength = length > packetDataSize ? packetDataSize : length;
NetPacket p = _packetPool.GetPacket(headerSize + sendLength + NetConstants.FragmentHeaderSize);
p.Property = property;
p.UserData = userData;
p.FragmentId = _fragmentId;
p.FragmentPart = partIdx;
p.FragmentsTotal = (ushort)totalPackets;
p.MarkFragmented();
Buffer.BlockCopy(data, partIdx * packetDataSize, p.RawData, NetConstants.FragmentTotalSize, sendLength);
channel.AddToQueue(p);
length -= sendLength;
}
_fragmentId++;
}
return;
}
//Else just send
NetPacket packet = _packetPool.GetPacket(headerSize + length);
packet.Property = property;
Buffer.BlockCopy(data, start, packet.RawData, headerSize, length);
packet.UserData = userData;
channel.AddToQueue(packet);
}
internal void Update(int deltaTime)
{
_timeSinceLastPacket += deltaTime;
switch (_connectionState)
{
case ConnectionState.Connected:
if (_timeSinceLastPacket > NetManager.DisconnectTimeout)
{
NetDebug.Write(
"[UPDATE] Disconnect by timeout: {0} > {1}",
_timeSinceLastPacket,
NetManager.DisconnectTimeout);
NetManager.DisconnectPeerForce(this, DisconnectReason.Timeout, 0, null);
return;
}
break;
case ConnectionState.ShutdownRequested:
if (_timeSinceLastPacket > NetManager.DisconnectTimeout)
{
_connectionState = ConnectionState.Disconnected;
}
else
{
_shutdownTimer += deltaTime;
if (_shutdownTimer >= ShutdownDelay)
{
_shutdownTimer = 0;
NetManager.SendRaw(_shutdownPacket, EndPoint);
}
}
return;
case ConnectionState.Outgoing:
_connectTimer += deltaTime;
if (_connectTimer > NetManager.ReconnectDelay)
{
_connectTimer = 0;
_connectAttempts++;
if (_connectAttempts > NetManager.MaxConnectAttempts)
{
NetManager.DisconnectPeerForce(this, DisconnectReason.ConnectionFailed, 0, null);
return;
}
//else send connect again
NetManager.SendRaw(_connectRequestPacket, EndPoint);
}
return;
case ConnectionState.Disconnected:
return;
}
//Send ping
_pingSendTimer += deltaTime;
if (_pingSendTimer >= NetManager.PingInterval)
{
NetDebug.Write("[PP] Send ping...");
//reset timer
_pingSendTimer = 0;
//send ping
_pingPacket.Sequence++;
//ping timeout
if (_pingTimer.IsRunning)
{
UpdateRoundTripTime((int)_pingTimer.ElapsedMilliseconds);
}
_pingTimer.Reset();
_pingTimer.Start();
NetManager.SendRaw(_pingPacket, EndPoint);
}
//RTT - round trip time
_rttResetTimer += deltaTime;
if (_rttResetTimer >= NetManager.PingInterval * 3)
{
_rttResetTimer = 0;
_rtt = _avgRtt;
_rttCount = 1;
}
UpdateMtuLogic(deltaTime);
//Pending send
Flush();
}