public override void SendRaw(byte eventId, PacketFlags flags, byte[] rawData, long?presetPacketId = null)
{
byte[] buffer = new byte[12 + rawData.Length];
long packetId = presetPacketId.HasValue ? presetPacketId.Value : DateTime.UtcNow.Ticks;
// PACKET HEADER CONSTRUCTION: 12 BYTES
/* 0x00 1 EVENT_ID */ buffer[0] = eventId;
/* 0x01 1 FLAGS */ buffer[1] = (byte)flags;
/* 0x02 8 PACKET_ID */ BitConverter.GetBytes(packetId).CopyTo(buffer, 2);
/* 0x0A 2 DATA_LENGTH */ BitConverter.GetBytes((ushort)rawData.Length).CopyTo(buffer, 10);
/* 0x0C DATA_LENGTH DATA */ rawData.CopyTo(buffer, 12);
try
{
socket.BeginSendTo(buffer, 0, buffer.Length, SocketFlags.None, endPoint, new AsyncCallback(SendToEvent), null);
NetBase.WriteDebug($"Send data to {IPEndPoint}: {PacketToStringRep(buffer)}");
if (flags.HasFlag(PacketFlags.Reliable) && !flags.HasFlag(PacketFlags.ReservedA))
{
lock (sentReliableDataLock)
{
sentReliablePacketInfo.Add(packetId);
}
new Task(() => ResendReliable(new ReliablePacketInfo(eventId, flags, rawData, packetId))).Start();
}
}
catch (Exception ex)
{
NetBase.WriteDebug(ex.ToString());
}
}
public Packet(byte[] data, PacketFlags flags)
{
Flags = flags;
if (flags.HasFlag(PacketFlags.NO_ALLOCATE))
{
Data = data;
}
else
{
Data = new byte[data.Length];
data.CopyTo(Data, 0);
}
}
/// <summary>Used internally by the netcode to process a received packet.</summary>
private async Task Receive(IPEndPoint remote, byte[] buffer, int length)
{
byte[] bufferDecompress = null;
try {
// Notify listener
Listener.OnHostReceiveSocket(remote, buffer, length);
// Discard if empty
if (length < 1)
{
return;
}
// Extract packet information
PacketType type = (PacketType)(buffer[0] & (byte)PacketType.Mask);
PacketFlags flags = (PacketFlags)(buffer[0] & (byte)PacketFlags.Mask);
ArraySegment <byte> packet = new ArraySegment <byte>(buffer, 1, length - 1);
// Peer packets
if (type == PacketType.Connected || type == PacketType.Reject || type == PacketType.Accept)
{
Peer peer = FindPeer(remote);
if (peer == null)
{
throw new FormatException(string.Format(
"No peer to receive packet {0} ({1}) from {2}", type, flags, remote
));
}
else
{
await peer.OnReceiveAsync(buffer, length);
return;
}
}
// Discard if unused packet type
if (type == PacketType.Unused1 || type == PacketType.Unused2)
{
throw new FormatException(string.Format(
"Unused packet {0} ({1} received from {2}", type, flags, remote
));
}
// Fragmentation, multiple messages and timing not supported
if (flags.HasFlag(PacketFlags.Fragmented))
{
throw new FormatException(string.Format(
"Packet {0} ({1}) from {2} length {3} is fragmented", flags, type, remote, length
));
}
else if (flags.HasFlag(PacketFlags.Combined))
{
throw new FormatException(string.Format(
"Packet {0} ({1}) from {2} length {3} has multiple messages", flags, type, remote, length
));
}
else if (flags.HasFlag(PacketFlags.Timed))
{
throw new FormatException(string.Format(
"Packet {0} ({1}) from {2} length {3} is timed", flags, type, remote, length
));
}
// Verify CRC32
if (flags.HasFlag(PacketFlags.Verified))
{
if (packet.Count < 4)
{
throw new FormatException(string.Format(
"Packet {0} ({1}) from {2} with length {3} is too short for CRC32",
type, flags, remote, length
));
}
else if (Config.CRC32)
{
uint computed = CRC32.Compute(packet.Array, packet.Offset + 4, packet.Count - 4);
uint received = Serializer.ReadUInt32(packet.Array, packet.Offset);
if (computed != received)
{
throw new FormatException(string.Format(
"CRC32 {0} does not match {1} in packet {2} ({3}) from {4} with length {5}",
received, computed, type, flags, remote, length
));
}
}
packet = new ArraySegment <byte>(packet.Array, packet.Offset + 4, packet.Count - 4);
}
// Decompress
if (flags.HasFlag(PacketFlags.Compressed))
{
bufferDecompress = Allocator.CreateMessage(packet.Count);
int len = Compressor.Decompress(packet, ref bufferDecompress, 0);
packet = new ArraySegment <byte>(bufferDecompress, 0, len);
}
// Process packet based on type
switch (type)
{
case PacketType.Request:
ReceiveRequest(remote, packet);
break;
case PacketType.Unconnected:
using (Reader reader = new Reader(packet.Array, 0, packet.Count)) {
Listener.OnHostReceiveUnconnected(remote, reader);
}
break;
case PacketType.Broadcast:
using (Reader reader = new Reader(packet.Array, 0, packet.Count)) {
Listener.OnHostReceiveBroadcast(remote, reader);
}
break;
}
} catch (Exception exception) {
Listener.OnHostException(remote, exception);
} finally {
Allocator.ReturnPacket(ref buffer);
Allocator.ReturnMessage(ref bufferDecompress);
ReceiveSemaphore.Release();
}
}
private async Task ProcessData(byte[] data, EndPoint clientEndPoint)
{
try
{
NetBase.WriteDebug($"Server received data: {PacketToStringRep(data)}");
UdpClient clientRef = clientList.Find(c => c.EndPoint.Equals(clientEndPoint));
if (clientRef == null)
{
if (data.Length != 4 || BitConverter.ToUInt32(data, 0) != Secret)
{
NetBase.WriteDebug($"Client attempted to connect from {clientEndPoint} with a bad secret.");
return;
}
UdpClient rCl = new UdpClient(socket, clientEndPoint);
rCl.ReliableResendDelay = this.ReliableResendDelay;
rCl.MaxResendAttempts = this.MaxResendAttempts;
rCl.DisconnectOnFailedResponse = this.DisconnectOnFailedResponse;
rCl.ClientDisconnected += c => DisconnectEventHandler(c);
rCl.SendRaw(254, PacketFlags.None, BitConverter.GetBytes(Secret));
clientList.Add(rCl);
if (ClientConnected != null)
{
Array.ForEach(ClientConnected.GetInvocationList(), d => d.DynamicInvoke(rCl));
}
}
else
{
if (data.Length < 12)
{
return;
}
byte eventId = data[0];
PacketFlags packetFlags = (PacketFlags)data[1];
long packetId = BitConverter.ToInt64(data, 2);
ushort dataLength = BitConverter.ToUInt16(data, 10);
byte[] netData = data.Skip(12).ToArray();
if (dataLength != netData.Length)
{
return;
}
Dictionary <byte, MethodInfo> eventsRef = packetFlags.HasFlag(PacketFlags.SystemMessage) ? systemDataEvents : netDataEvents;
if (packetFlags.HasFlag(PacketFlags.Reliable))
{
clientRef.SendF(2, PacketFlags.SystemMessage, packetId);
}
if (eventsRef.ContainsKey(eventId) && !clientRef.receivedReliablePacketInfo.Contains(packetId))
{
if (packetFlags.HasFlag(PacketFlags.Reliable))
{
if (!clientRef.receivedReliablePacketInfo.Contains(packetId))
{
lock (clientRef.receivedReliableDataLock)
{
clientRef.receivedReliablePacketInfo.Add(packetId);
}
}
}
clientRef.lastMessageReceived = DateTime.UtcNow;
MethodInfo netEventMethod = eventsRef[eventId];
ParameterInfo[] parameters = netEventMethod.GetParameters().Skip(1).ToArray();
Type[] parameterTypes = (from p in parameters
select p.ParameterType).ToArray();
object[] instances = DynamicPacket.GetInstancesFromData(netData, converterInstance, parameterTypes);
object[] instancesWithNetBase = new object[1 + instances.Length];
instancesWithNetBase[0] = clientRef;
instances.CopyTo(instancesWithNetBase, 1);
netEventMethod.Invoke(netEventMethod.IsStatic ? null : this, instancesWithNetBase);
}
}
}
catch (Exception ex)
{
NetBase.WriteDebug(ex.ToString());
}
}
private async Task ProcessData(byte[] data)
{
try
{
NetBase.WriteDebug($"Client received data: {PacketToStringRep(data)}");
if (data.Length < 12)
{
return;
}
byte eventId = data[0];
PacketFlags packetFlags = (PacketFlags)data[1];
long packetId = BitConverter.ToInt64(data, 2);
ushort dataLength = BitConverter.ToUInt16(data, 10);
byte[] netData = data.Skip(12).ToArray();
if (dataLength != netData.Length)
{
return;
}
Dictionary <byte, MethodInfo> eventsRef = packetFlags.HasFlag(PacketFlags.SystemMessage) ? systemDataEvents : netDataEvents;
if (packetFlags.HasFlag(PacketFlags.Reliable))
{
SendF(2, PacketFlags.SystemMessage, packetId);
}
if (eventsRef.ContainsKey(eventId) && !receivedReliablePacketInfo.Contains(packetId))
{
if (packetFlags.HasFlag(PacketFlags.Reliable))
{
if (!receivedReliablePacketInfo.Contains(packetId))
{
lock (receivedReliableDataLock)
{
receivedReliablePacketInfo.Add(packetId);
}
}
}
lastMessageReceived = DateTime.UtcNow;
MethodInfo netEventMethod = eventsRef[eventId];
ParameterInfo[] parameters = netEventMethod.GetParameters().Skip(1).ToArray();
Type[] parameterTypes = (from p in parameters
select p.ParameterType).ToArray();
object[] instances = DynamicPacket.GetInstancesFromData(netData, converterInstance, parameterTypes);
object[] instancesWithNetBase = new object[1 + instances.Length];
instancesWithNetBase[0] = this;
instances.CopyTo(instancesWithNetBase, 1);
netEventMethod.Invoke(netEventMethod.IsStatic ? null : this, instancesWithNetBase);
}
}
catch (Exception ex)
{
NetBase.WriteDebug(ex.ToString());
}
}
