private void ProcessInitialPacket(Packet packet, IPEndPoint endPoint)
{
byte[] data;
// Unsupported version. Version negotiation packet is sent only on initial connection. All other packets are dropped. (5.2.2 / 16th draft)
if (packet.Version != QuicVersion.CurrentVersion || !QuicVersion.SupportedVersions.Contains(packet.Version))
{
VersionNegotiationPacket vnp = _packetCreator.CreateVersionNegotiationPacket();
data = vnp.Encode();
_client.Send(data, data.Length, endPoint);
return;
}
InitialPacket cast = packet as InitialPacket;
InitialPacket ip = _packetCreator.CreateInitialPacket(0, cast.SourceConnectionId);
// Protocol violation if the initial packet is smaller than the PMTU. (pt. 14 / 16th draft)
if (cast.Encode().Length < QuicSettings.PMTU)
{
ip.AttachFrame(new ConnectionCloseFrame(ErrorCode.PROTOCOL_VIOLATION, "PMTU have not been reached."));
}
else if (ConnectionPool.AddConnection(cast.SourceConnectionId) == true)
{
// We're including the maximum possible stream id during the connection handshake. (4.5 / 16th draft)
ip.AttachFrame(new MaxStreamIdFrame(QuicSettings.MaximumStreamId, StreamType.ServerBidirectional));
}
else
{
// Not accepting connections. Send initial packet with CONNECTION_CLOSE frame.
// TODO: Buffering. The server might buffer incomming 0-RTT packets in anticipation of late delivery InitialPacket.
// Maximum buffer size should be set in QuicSettings.
ip.AttachFrame(new ConnectionCloseFrame(ErrorCode.SERVER_BUSY, "The server is too busy to process your request."));
}
data = ip.Encode();
int dataSent = _client.Send(data, data.Length, endPoint);
if (dataSent > 0)
{
// Create a QuicContext to represent the connected client.
QuicContext context = new QuicContext(_client, endPoint);
ConnectionPool.AttachContext(cast.SourceConnectionId, context);
OnClientConnected?.Invoke(context);
}
}
