//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:
NetManager.CreateReceiveEvent(packet, DeliveryMethod.Unreliable, this);
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;
}
}
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 !UNITY || UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
#if NETSTANDARD || NETCOREAPP
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
#endif
try
{
socket.IOControl(SioUdpConnreset, new byte[] { 0 }, null);
}
catch
{
//ignored
}
#endif
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);
}
internal void AddReliablePacket(DeliveryMethod method, 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.FragmentedHeaderTotalSize;
//Check for finish
if (incomingFragments.ReceivedCount != fragments.Length)
{
return;
}
//unreliable to save header space
NetPacket resultingPacket = _packetPool.GetWithProperty(
PacketProperty.Unreliable,
incomingFragments.TotalSize);
int firstFragmentSize = fragments[0].Size - NetConstants.FragmentedHeaderTotalSize;
for (int i = 0; i < incomingFragments.ReceivedCount; i++)
{
var fragment = fragments[i];
//Create resulting big packet
Buffer.BlockCopy(
fragment.RawData,
NetConstants.FragmentedHeaderTotalSize,
resultingPacket.RawData,
NetConstants.HeaderSize + firstFragmentSize * i,
fragment.Size - NetConstants.FragmentedHeaderTotalSize);
//Free memory
_packetPool.Recycle(fragment);
}
Array.Clear(fragments, 0, incomingFragments.ReceivedCount);
//Send to process
NetManager.CreateReceiveEvent(resultingPacket, method, this);
//Clear memory
_holdedFragments.Remove(packetFragId);
}
else //Just simple packet
{
NetManager.CreateReceiveEvent(p, method, this);
}
}
private bool BindSocket(Socket socket, IPEndPoint ep, bool reuseAddress)
{
//Setup socket
socket.ReceiveTimeout = 500;
socket.SendTimeout = 500;
socket.ExclusiveAddressUse = !reuseAddress;
socket.ReceiveBufferSize = NetConstants.SocketBufferSize;
socket.SendBufferSize = NetConstants.SocketBufferSize;
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, reuseAddress);
if (socket.AddressFamily == AddressFamily.InterNetwork)
{
socket.Ttl = NetConstants.SocketTTL;
#if NETCORE
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);
}
private bool BindSocket(Socket socket, IPEndPoint ep, bool reuseAddress, IPv6Mode ipv6Mode)
{
//Setup socket
socket.ReceiveTimeout = 500;
socket.SendTimeout = 500;
socket.ReceiveBufferSize = NetConstants.SocketBufferSize;
socket.SendBufferSize = NetConstants.SocketBufferSize;
#if !UNITY || UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN
#if NETSTANDARD || NETCOREAPP
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
#endif
try
{
socket.IOControl(SioUdpConnreset, new byte[] { 0 }, null);
}
catch
{
//ignored
}
#endif
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)
{
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);
}
}
else //IPv6 specific
{
if (ipv6Mode == IPv6Mode.DualMode)
{
try
{
//Disable IPv6 only mode
socket.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, false);
}
catch (Exception e)
{
NetDebug.WriteError("[B]Bind exception (dualmode setting): {0}", e.ToString());
}
}
}
//Bind
try
{
socket.Bind(ep);
NetDebug.Write(NetLogLevel.Trace, "[B]Successfully binded to port: {0}", ((IPEndPoint)socket.LocalEndPoint).Port);
//join multicast
if (socket.AddressFamily == AddressFamily.InterNetworkV6)
{
try
{
#if !UNITY
socket.SetSocketOption(
SocketOptionLevel.IPv6,
SocketOptionName.AddMembership,
new IPv6MulticastOption(MulticastAddressV6));
#endif
}
catch (Exception)
{
// Unity3d throws exception - ignored
}
}
}
catch (SocketException bindException)
{
switch (bindException.SocketErrorCode)
{
//IPv6 bind fix
case SocketError.AddressAlreadyInUse:
if (socket.AddressFamily == AddressFamily.InterNetworkV6 && ipv6Mode != IPv6Mode.DualMode)
{
try
{
//Set IPv6Only
socket.SetSocketOption(SocketOptionLevel.IPv6, (SocketOptionName)27, true);
socket.Bind(ep);
}
#if UNITY_2018_3_OR_NEWER
catch (SocketException ex)
{
//because its fixed in 2018_3
NetDebug.WriteError("[B]Bind exception: {0}, errorCode: {1}", ex.ToString(), ex.SocketErrorCode);
#else
catch (SocketException)
{
#endif
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);
}
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 bool BindSocket(Socket socket, IPEndPoint ep, bool reuseAddress)
{
//Setup socket
socket.ReceiveTimeout = 500;
socket.SendTimeout = 500;
socket.ReceiveBufferSize = NetConstants.SocketBufferSize;
socket.SendBufferSize = NetConstants.SocketBufferSize;
try
{
//知识点1 在UDP通信过程中，如果客户端中途断开，服务器会收到一个SocketException，错
//误ID为10054，描述是“远程主机强迫关闭了一个现有的连接”，紧接着的事就可怕了，UDP
//服务终止监听，所有客户端都受到了影响。也就是说一个客户端引起的异常导致了整个系统的崩溃。
//UDP是无连接的，可是当实际现场使用时，如果远程主机异常关闭，服务器则会抛出一个异常：远程主机强行关闭了一个连接
//而一但这个异常抛出后，又没有及时处理，那么整个UDP服务都将崩溃而不能接收任何数据
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 NETSTANDARD2_0 || NETCOREAPP2_0
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);
}
internal int SendRaw(byte[] message, int start, int length, IPEndPoint remoteEndPoint)
{
if (!IsRunning)
{
return(0);
}
NetPacket expandedPacket = null;
if (_extraPacketLayer != null)
{
expandedPacket = PoolGetPacket(length + _extraPacketLayer.ExtraPacketSizeForLayer);
Buffer.BlockCopy(message, start, expandedPacket.RawData, 0, length);
start = 0;
_extraPacketLayer.ProcessOutBoundPacket(ref remoteEndPoint, ref expandedPacket.RawData, ref start, ref length);
message = expandedPacket.RawData;
}
var socket = _udpSocketv4;
if (remoteEndPoint.AddressFamily == AddressFamily.InterNetworkV6 && IPv6Support)
{
socket = _udpSocketv6;
if (socket == null)
{
return(0);
}
}
int result;
try
{
if (UseNativeSockets)
{
byte[] socketAddress;
if (remoteEndPoint is NativeEndPoint nep)
{
socketAddress = nep.NativeAddress;
}
else //Convert endpoint to raw
{
if (_endPointBuffer == null)
{
_endPointBuffer = new byte[NativeSocket.IPv6AddrSize];
}
socketAddress = _endPointBuffer;
bool ipv4 = remoteEndPoint.AddressFamily == AddressFamily.InterNetwork;
short addressFamily = NativeSocket.GetNativeAddressFamily(remoteEndPoint);
socketAddress[0] = (byte)(addressFamily);
socketAddress[1] = (byte)(addressFamily >> 8);
socketAddress[2] = (byte)(remoteEndPoint.Port >> 8);
socketAddress[3] = (byte)(remoteEndPoint.Port);
if (ipv4)
{
#pragma warning disable 618
long addr = remoteEndPoint.Address.Address;
#pragma warning restore 618
socketAddress[4] = (byte)(addr);
socketAddress[5] = (byte)(addr >> 8);
socketAddress[6] = (byte)(addr >> 16);
socketAddress[7] = (byte)(addr >> 24);
}
else
{
#if NETCOREAPP || NETSTANDARD2_1 || NETSTANDARD2_1_OR_GREATER
remoteEndPoint.Address.TryWriteBytes(new Span <byte>(socketAddress, 8, 16), out _);
#else
byte[] addrBytes = remoteEndPoint.Address.GetAddressBytes();
Buffer.BlockCopy(addrBytes, 0, socketAddress, 8, 16);
#endif
}
}
#if LITENETLIB_UNSAFE
unsafe
{
fixed(byte *dataWithOffset = &message[start])
{
result =
NativeSocket.SendTo(socket.Handle, dataWithOffset, length, socketAddress, socketAddress.Length);
}
}
#else
if (start > 0)
{
if (_sendToBuffer == null)
{
_sendToBuffer = new byte[NetConstants.MaxPacketSize];
}
Buffer.BlockCopy(message, start, _sendToBuffer, 0, length);
message = _sendToBuffer;
}
result = NativeSocket.SendTo(socket.Handle, message, length, socketAddress, socketAddress.Length);
#endif
if (result == -1)
{
throw NativeSocket.GetSocketException();
}
}
else
{
result = socket.SendTo(message, start, length, SocketFlags.None, remoteEndPoint);
}
//NetDebug.WriteForce("[S]Send packet to {0}, result: {1}", remoteEndPoint, result);
}
catch (SocketException ex)
{
switch (ex.SocketErrorCode)
{
case SocketError.NoBufferSpaceAvailable:
case SocketError.Interrupted:
return(0);
case SocketError.MessageSize:
NetDebug.Write(NetLogLevel.Trace, "[SRD] 10040, datalen: {0}", length);
return(0);
case SocketError.HostUnreachable:
case SocketError.NetworkUnreachable:
if (DisconnectOnUnreachable && TryGetPeer(remoteEndPoint, out var fromPeer))
{
DisconnectPeerForce(
fromPeer,
ex.SocketErrorCode == SocketError.HostUnreachable
? DisconnectReason.HostUnreachable
: DisconnectReason.NetworkUnreachable,
ex.SocketErrorCode,
null);
}
CreateEvent(NetEvent.EType.Error, remoteEndPoint: remoteEndPoint, errorCode: ex.SocketErrorCode);
return(-1);
default:
NetDebug.WriteError($"[S] {ex}");
return(-1);
}
}
catch (Exception ex)
{
NetDebug.WriteError($"[S] {ex}");
return(0);
}
finally
{
if (expandedPacket != null)
{
PoolRecycle(expandedPacket);
}
}
if (result <= 0)
{
return(0);
}
if (EnableStatistics)
{
Statistics.IncrementPacketsSent();
Statistics.AddBytesSent(length);
}
return(result);
}
private bool BindSocket(Socket socket, IPEndPoint ep)
{
//Setup socket
socket.ReceiveTimeout = 500;
socket.SendTimeout = 500;
socket.ReceiveBufferSize = NetConstants.SocketBufferSize;
socket.SendBufferSize = NetConstants.SocketBufferSize;
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
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 (ep.AddressFamily == AddressFamily.InterNetwork || IPv6Mode == IPv6Mode.DualMode)
{
Ttl = NetConstants.SocketTTL;
try { socket.EnableBroadcast = true; }
catch (SocketException e)
{
NetDebug.WriteError($"[B]Broadcast error: {e.SocketErrorCode}");
}
if (IPv6Mode == IPv6Mode.DualMode)
{
try { socket.DualMode = true; }
catch (Exception e)
{
NetDebug.WriteError($"[B]Bind exception (dualmode setting): {e}");
}
}
else if (!RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
try { socket.DontFragment = true; }
catch (SocketException e)
{
NetDebug.WriteError($"[B]DontFragment error: {e.SocketErrorCode}");
}
}
}
//Bind
try
{
socket.Bind(ep);
NetDebug.Write(NetLogLevel.Trace, $"[B]Successfully binded to port: {((IPEndPoint)socket.LocalEndPoint).Port}, AF: {socket.AddressFamily}");
//join multicast
if (ep.AddressFamily == AddressFamily.InterNetworkV6)
{
try
{
#if !UNITY_2018_3_OR_NEWER
socket.SetSocketOption(
SocketOptionLevel.IPv6,
SocketOptionName.AddMembership,
new IPv6MulticastOption(MulticastAddressV6));
#endif
}
catch (Exception)
{
// Unity3d throws exception - ignored
}
}
}
catch (SocketException bindException)
{
switch (bindException.SocketErrorCode)
{
//IPv6 bind fix
case SocketError.AddressAlreadyInUse:
if (socket.AddressFamily == AddressFamily.InterNetworkV6 && IPv6Mode != IPv6Mode.DualMode)
{
try
{
//Set IPv6Only
socket.DualMode = false;
socket.Bind(ep);
}
catch (SocketException ex)
{
//because its fixed in 2018_3
NetDebug.WriteError($"[B]Bind exception: {ex}, errorCode: {ex.SocketErrorCode}");
return(false);
}
return(true);
}
break;
//hack for iOS (Unity3D)
case SocketError.AddressFamilyNotSupported:
return(true);
}
NetDebug.WriteError($"[B]Bind exception: {bindException}, errorCode: {bindException.SocketErrorCode}");
return(false);
}
return(true);
}
public int SendTo(byte[] data, int offset, int size, IPEndPoint remoteEndPoint, ref SocketError errorCode)
{
if (!IsActive())
{
return(0);
}
try
{
var socket = _udpSocketv4;
if (remoteEndPoint.AddressFamily == AddressFamily.InterNetworkV6 && IPv6Support)
{
socket = _udpSocketv6;
if (socket == null)
{
return(0);
}
}
int result;
if (_useNativeSockets)
{
byte[] socketAddress;
if (remoteEndPoint is NativeEndPoint nep)
{
socketAddress = nep.NativeAddress;
}
else //Convert endpoint to raw
{
if (_endPointBuffer == null)
{
_endPointBuffer = new byte[NativeSocket.IPv6AddrSize];
}
socketAddress = _endPointBuffer;
bool ipv4 = remoteEndPoint.AddressFamily == AddressFamily.InterNetwork;
short addressFamily = NativeSocket.GetNativeAddressFamily(remoteEndPoint);
socketAddress[0] = (byte)(addressFamily);
socketAddress[1] = (byte)(addressFamily >> 8);
socketAddress[2] = (byte)(remoteEndPoint.Port >> 8);
socketAddress[3] = (byte)(remoteEndPoint.Port);
if (ipv4)
{
#pragma warning disable 618
long addr = remoteEndPoint.Address.Address;
#pragma warning restore 618
socketAddress[4] = (byte)(addr);
socketAddress[5] = (byte)(addr >> 8);
socketAddress[6] = (byte)(addr >> 16);
socketAddress[7] = (byte)(addr >> 24);
}
else
{
#if NETCOREAPP || NETSTANDARD2_0_OR_GREATER
remoteEndPoint.Address.TryWriteBytes(new Span <byte>(socketAddress, 8, 16), out _);
#else
byte[] addrBytes = remoteEndPoint.Address.GetAddressBytes();
Buffer.BlockCopy(addrBytes, 0, socketAddress, 8, 16);
#endif
}
}
#if LITENETLIB_UNSAFE
unsafe
{
fixed(byte *dataWithOffset = &data[offset])
{
result = NativeSocket.SendTo(socket.Handle, dataWithOffset, size, socketAddress, socketAddress.Length);
}
}
#else
if (offset > 0)
{
if (_sendToBuffer == null)
{
_sendToBuffer = new byte[NetConstants.MaxPacketSize];
}
Buffer.BlockCopy(data, offset, _sendToBuffer, 0, size);
data = _sendToBuffer;
}
result = NativeSocket.SendTo(socket.Handle, data, size, socketAddress, socketAddress.Length);
#endif
if (result == -1)
{
throw NativeSocket.GetSocketException();
}
}
else
{
result = socket.SendTo(data, offset, size, SocketFlags.None, remoteEndPoint);
}
//NetDebug.WriteForce("[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);
}
}