private void processConnectionKeepAlive(NetcodePacketHeader header, int length, ByteArrayReaderWriter stream)
{
if (checkReplay(header))
{
return;
}
var decryptKey = serverToClientKey;
var keepAlive = new NetcodeKeepAlivePacket()
{
Header = header
};
if (!keepAlive.Read(stream, length, decryptKey, connectToken.ProtocolID))
{
return;
}
if (this.state == ClientState.Connected || this.state == ClientState.SendingChallengeResponse)
{
lastResponseTime = time;
}
if (this.state == ClientState.SendingChallengeResponse)
{
this.clientIndex = keepAlive.ClientIndex;
this.maxSlots = keepAlive.MaxSlots;
changeState(ClientState.Connected);
}
}
// send a keep-alive packet to the client
private void sendKeepAlive(RemoteClient client)
{
var packet = new NetcodeKeepAlivePacket()
{
ClientIndex = client.ClientIndex, MaxSlots = (uint)this.maxSlots
};
var cryptIdx = encryptionManager.FindEncryptionMapping(client.RemoteEndpoint, time);
if (cryptIdx == -1)
{
return;
}
var cryptKey = encryptionManager.GetSendKey(cryptIdx);
serializePacket(new NetcodePacketHeader()
{
PacketType = NetcodePacketType.ConnectionKeepAlive
}, (writer) =>
{
packet.Write(writer);
}, client.RemoteEndpoint, cryptKey);
}
// process an incoming connection keep alive packet
private void processConnectionKeepAlive(ByteArrayReaderWriter reader, NetcodePacketHeader header, int size, EndPoint sender)
{
if (checkReplay(header, sender))
{
log("Detected replay in keep-alive", NetcodeLogLevel.Debug);
return;
}
// encryption mapping was not registered, so don't bother
int cryptIdx = encryptionManager.FindEncryptionMapping(sender, time);
if (cryptIdx == -1)
{
log("No crytpo key for sender", NetcodeLogLevel.Debug);
return;
}
// grab the decryption key and decrypt the packet
var decryptKey = encryptionManager.GetReceiveKey(cryptIdx);
var keepAlivePacket = new NetcodeKeepAlivePacket()
{
Header = header
};
if (!keepAlivePacket.Read(reader, size - (int)reader.ReadPosition, decryptKey, protocolID))
{
log("Failed to decrypt", NetcodeLogLevel.Debug);
return;
}
if (keepAlivePacket.ClientIndex >= maxSlots)
{
log("Invalid client index", NetcodeLogLevel.Debug);
return;
}
var client = this.clientSlots[(int)keepAlivePacket.ClientIndex];
if (client == null)
{
log("Failed to find client for endpoint", NetcodeLogLevel.Debug);
return;
}
if (!client.RemoteEndpoint.Equals(sender))
{
log("Client does not match sender", NetcodeLogLevel.Debug);
return;
}
if (!client.Confirmed)
{
// trigger callback
if (OnClientConnected != null)
{
OnClientConnected(client);
}
log("Client {0} connected", NetcodeLogLevel.Info, client.RemoteEndpoint);
}
client.Confirmed = true;
client.Touch(time);
int idx = encryptionManager.FindEncryptionMapping(client.RemoteEndpoint, time);
encryptionManager.Touch(idx, client.RemoteEndpoint, time);
}
