public static void SendPacket(UdpClient client, IPEndPoint endPoint,
ChunkConstruct packet)
{
if (packet.DataSize == 0)
{
return;
}
Debug.Assert((packet.Token & ~TokenHelper.TokenMask) == 0, "token out of range");
var buffer = new byte[MaxPacketSize];
var compressedSize = -1;
if (!packet.Flags.HasFlag(PacketFlags.Control))
{
compressedSize = Huffman.Compress(packet.Data, 0, packet.DataSize,
buffer, PacketHeaderSize, MaxPayload);
}
int finalSize;
if (compressedSize > 0 && compressedSize < packet.DataSize)
{
finalSize = compressedSize;
packet.Flags |= PacketFlags.Compression;
}
else
{
finalSize = packet.DataSize;
Buffer.BlockCopy(packet.Data, 0, buffer, PacketHeaderSize, packet.DataSize);
packet.Flags &= ~PacketFlags.Compression;
}
finalSize += PacketHeaderSize;
buffer[0] = (byte)((((int)packet.Flags << 2) & 0xfc) | ((packet.Ack >> 8) & 0x03)); // flags and ack
buffer[1] = (byte)((packet.Ack) & 0xff);
buffer[2] = (byte)((packet.NumChunks) & 0xff);
buffer[3] = (byte)((packet.Token >> 24) & 0xff);
buffer[4] = (byte)((packet.Token >> 16) & 0xff);
buffer[5] = (byte)((packet.Token >> 8) & 0xff);
buffer[6] = (byte)((packet.Token) & 0xff);
client.Send(buffer, finalSize, endPoint);
}
public static void SendConnectionMsg(UdpClient client, IPEndPoint endPoint,
uint token, int ack, ConnectionMessages msg, byte[] extraData, int extraSize)
{
var packet = new ChunkConstruct(1 + extraSize)
{
Token = token,
Flags = PacketFlags.Control,
Ack = ack,
NumChunks = 0,
DataSize = 1 + extraSize
};
packet.Data[0] = (byte)msg;
if (extraSize > 0)
{
Buffer.BlockCopy(extraData, 0, packet.Data, 1, extraSize);
}
SendPacket(client, endPoint, packet);
}
/*
* [5c22fc7f][unpack]: 1
* [5c22fc7f][test]: token=4294967295 res=3569422453
* [5c22fc7f][test]: bytes=520 accept 0 1
* [5c22fc7f][unpack]: 8
* [5c22fc7f][test]: token=157418043 res=4168385603
* [5c22fc7f][check]: cur=157418043 seed=1257701721
* [5c22fc7f][test]: bytes=22 accept 1 8
*
*/
public override int ProcessMessage(IPEndPoint endPoint, ChunkConstruct packet)
{
var broadcastResponse = false;
// TODO ODODODO
if (packet.Token != TokenHelper.TokenNone &&
!CheckToken(endPoint, packet.Token, packet.ResponseToken, ref broadcastResponse))
{
return(0);
}
var verified = packet.Token != TokenHelper.TokenNone;
var tokenMessage = packet.Flags.HasFlag(PacketFlags.Control) &&
packet.Data[0] == (int)ConnectionMessages.Token;
if (packet.Flags.HasFlag(PacketFlags.Connless))
{
return((verified && !broadcastResponse) ? 1 : 0);
}
if (!tokenMessage)
{
return((verified && !broadcastResponse) ? 1 : 0);
}
if (verified)
{
return(broadcastResponse ? -1 : 1);
}
if (packet.DataSize >= TokenHelper.TokenRequestDataSize)
{
NetworkHelper.SendConnectionMsgWithToken(Client, endPoint, packet.ResponseToken, 0,
ConnectionMessages.Token,
GenerateToken(endPoint), false);
}
return(0);
}
public abstract int ProcessMessage(IPEndPoint endPoint,
ChunkConstruct chunkConstruct);
public ChunkReceiver()
{
ChunkConstruct = new ChunkConstruct(NetworkHelper.MaxPayload);
}
public abstract bool Feed(ChunkConstruct packet, IPEndPoint endPoint);
public override bool Feed(ChunkConstruct packet, IPEndPoint endPoint)
{
if (Sequence >= PeerAck)
{
if (packet.Ack < PeerAck || packet.Ack > Sequence)
{
return(false);
}
}
else
{
if (packet.Ack < PeerAck && packet.Ack > Sequence)
{
return(false);
}
}
PeerAck = packet.Ack;
if (packet.Token == TokenHelper.TokenNone || packet.Token != Token)
{
return(false);
}
if (packet.Flags.HasFlag(PacketFlags.Resend))
{
Resend();
}
if (packet.Flags.HasFlag(PacketFlags.Connless))
{
return(true);
}
var now = Time.Get();
if (packet.Flags.HasFlag(PacketFlags.Control))
{
var msg = (ConnectionMessages)packet.Data[0];
if (msg == ConnectionMessages.Close)
{
State = ConnectionState.Error;
RemoteClosed = true;
string reason = null;
if (packet.DataSize > 1)
{
reason = Encoding.UTF8.GetString(packet.Data, 1, Math.Clamp(packet.DataSize - 1, 1, 128));
reason = reason.SanitizeStrong();
}
Error = reason;
Debug.Log("connection", $"closed reason='{reason}'");
}
else if (msg == ConnectionMessages.Token)
{
PeerToken = packet.ResponseToken;
if (State == ConnectionState.Token)
{
LastReceiveTime = now;
State = ConnectionState.Connect;
SendConnectionMsgWithToken(ConnectionMessages.Connect);
Debug.Log("connection", $"got token, replying, token={PeerToken:X} mytoken={Token:X}");
}
else
{
Debug.Log("connection", $"got token, token={PeerToken:X}");
}
}
else
{
if (State == ConnectionState.Offline)
{
if (msg == ConnectionMessages.Connect)
{
var token = Token;
Reset();
State = ConnectionState.Pending;
EndPoint = endPoint;
Token = token;
PeerToken = packet.ResponseToken;
LastSendTime = now;
LastReceiveTime = now;
ConnectedAt = now;
SendConnectionMsg(ConnectionMessages.ConnectAccept, null);
Debug.Log("connection", "got connection, sending connect+accept");
}
}
else if (State == ConnectionState.Connect)
{
if (msg == ConnectionMessages.ConnectAccept)
{
LastReceiveTime = now;
SendConnectionMsg(ConnectionMessages.Accept, null);
State = ConnectionState.Online;
Debug.Log("connection", "got connect+accept, sending accept. connection online");
}
}
}
}
else if (State == ConnectionState.Pending)
{
LastReceiveTime = now;
State = ConnectionState.Online;
Debug.Log("connection", "connecting online");
}
if (State == ConnectionState.Online)
{
LastReceiveTime = now;
AckChunks(packet.Ack);
}
return(true);
}
public NetworkConnection()
{
ChunksForResends = new List <ChunkResend>();
ResendChunkConstruct = new ChunkConstruct(NetworkHelper.MaxPayload);
}
public static bool UnpackPacket(byte[] data, int dataSize,
ChunkConstruct chunkConstruct)
{
if (dataSize < PacketHeaderSize || dataSize > MaxPacketSize)
{
Debug.Log("network", $"packet size wrong, size={dataSize}");
return(false);
}
chunkConstruct.Flags = (PacketFlags)((data[0] & 0xfc) >> 2);
if (chunkConstruct.Flags.HasFlag(PacketFlags.Connless))
{
if (dataSize < PacketHeaderSizeConnless)
{
Debug.Log("network", $"connless packet too small, size={dataSize}");
return(false);
}
chunkConstruct.Flags = PacketFlags.Connless;
chunkConstruct.Ack = 0;
chunkConstruct.NumChunks = 0;
var version = data[0] & 0x3;
if (version != PacketVersion)
{
return(false);
}
chunkConstruct.DataSize = dataSize - PacketHeaderSizeConnless;
chunkConstruct.Token =
(uint)((data[1] << 24) |
(data[2] << 16) |
(data[3] << 8) |
(data[4]));
chunkConstruct.ResponseToken =
(uint)((data[5] << 24) |
(data[6] << 16) |
(data[7] << 8) |
(data[8]));
Buffer.BlockCopy(data, PacketHeaderSizeConnless,
chunkConstruct.Data, 0, chunkConstruct.DataSize);
}
else
{
if (dataSize - PacketHeaderSize > MaxPayload)
{
Debug.Log("network", $"packet payload too big, size={dataSize}");
return(false);
}
chunkConstruct.Ack = ((data[0] & 0x3) << 8) | data[1];
chunkConstruct.NumChunks = data[2];
chunkConstruct.DataSize = dataSize - PacketHeaderSize;
chunkConstruct.ResponseToken = TokenHelper.TokenNone;
chunkConstruct.Token =
(uint)((data[3] << 24) |
(data[4] << 16) |
(data[5] << 8) |
(data[6]));
if (chunkConstruct.Flags.HasFlag(PacketFlags.Compression))
{
chunkConstruct.DataSize = Huffman.Decompress(data, PacketHeaderSize,
chunkConstruct.DataSize, chunkConstruct.Data, 0, chunkConstruct.Data.Length);
}
else
{
Buffer.BlockCopy(data, PacketHeaderSize,
chunkConstruct.Data, 0, chunkConstruct.DataSize);
}
}
if (chunkConstruct.DataSize < 0)
{
Debug.Log("network", "error during packet decoding");
return(false);
}
if (chunkConstruct.Flags.HasFlag(PacketFlags.Control))
{
if (chunkConstruct.DataSize >= 5)
{
if (chunkConstruct.Data[0] == (int)ConnectionMessages.Connect ||
chunkConstruct.Data[0] == (int)ConnectionMessages.Token)
{
chunkConstruct.ResponseToken =
(uint)((chunkConstruct.Data[1] << 24) |
(chunkConstruct.Data[2] << 16) |
(chunkConstruct.Data[3] << 8) |
(chunkConstruct.Data[4]));
}
}
}
return(true);
}