public void Connect(byte[] connectToken, bool autoTick)
{
if (state != ClientState.Disconnected)
{
throw new InvalidOperationException();
}
keepAliveTimer = 0.0;
connectServers.Clear();
replayProtection.Reset();
if (connectToken.Length != Defines.NETCODE_CONNECT_TOKEN_PUBLIC_BYTES)
{
changeState(ClientState.InvalidConnectToken);
return;
}
NetcodePublicConnectToken tokenData = new NetcodePublicConnectToken();
using (var reader = ByteArrayReaderWriter.Get(connectToken))
{
if (!tokenData.Read(reader))
{
changeState(ClientState.InvalidConnectToken);
return;
}
}
if (tokenData.CreateTimestamp >= tokenData.ExpireTimestamp)
{
changeState(ClientState.InvalidConnectToken);
return;
}
clientToServerKey = tokenData.ClientToServerKey;
serverToClientKey = tokenData.ServerToClientKey;
foreach (var server in tokenData.ConnectServers)
{
connectServers.Enqueue(server.Endpoint);
}
this.connectToken = tokenData;
this.state = ClientState.SendingConnectionRequest;
// bind socket, spin up threads, and start trying to connect
isRunning = true;
currentServerEndpoint = connectServers.Dequeue();
createSocket(currentServerEndpoint);
if (autoTick)
{
this.time = DateTime.Now.GetTotalSeconds();
ThreadPool.QueueUserWorkItem(clientTick);
}
}
internal byte[] GenerateConnectToken(IPEndPoint[] addressList, double time, int expirySeconds, int serverTimeout, ulong sequence, ulong clientID, byte[] userData)
{
if (userData.Length > 256)
{
throw new ArgumentOutOfRangeException("User data cannot be larger than 256 bytes");
}
if (addressList == null)
{
throw new NullReferenceException("Address list cannot be null");
}
else if (addressList.Length == 0)
{
throw new ArgumentOutOfRangeException("Address list cannot be empty");
}
else if (addressList.Length > Defines.MAX_SERVER_ADDRESSES)
{
throw new ArgumentOutOfRangeException("Address list cannot contain more than " + Defines.MAX_SERVER_ADDRESSES + " entries");
}
NetcodePrivateConnectToken privateConnectToken = new NetcodePrivateConnectToken();
privateConnectToken.ClientID = clientID;
privateConnectToken.TimeoutSeconds = serverTimeout;
// generate random crypto keys
byte[] clientToServerKey = new byte[32];
byte[] serverToClientKey = new byte[32];
KeyUtils.GenerateKey(clientToServerKey);
KeyUtils.GenerateKey(serverToClientKey);
privateConnectToken.ClientToServerKey = clientToServerKey;
privateConnectToken.ServerToClientKey = serverToClientKey;
privateConnectToken.UserData = new byte[256];
Buffer.BlockCopy(userData, 0, privateConnectToken.UserData, 0, userData.Length);
privateConnectToken.ConnectServers = new ConnectTokenServerEntry[addressList.Length];
for (int i = 0; i < privateConnectToken.ConnectServers.Length; i++)
{
privateConnectToken.ConnectServers[i] = new ConnectTokenServerEntry()
{
AddressType = addressList[i].AddressFamily == AddressFamily.InterNetwork ? NetcodeAddressType.IPv4 : NetcodeAddressType.IPv6,
Endpoint = addressList[i]
};
}
byte[] privateConnectTokenBytes = new byte[1024];
using (var writer = ByteArrayReaderWriter.Get(privateConnectTokenBytes))
{
privateConnectToken.Write(writer);
}
ulong createTimestamp = (ulong)Math.Truncate(time);
ulong expireTimestamp = expirySeconds >= 0 ? (createTimestamp + (ulong)expirySeconds) : 0xFFFFFFFFFFFFFFFFUL;
byte[] encryptedPrivateToken = new byte[1024];
PacketIO.EncryptPrivateConnectToken(privateConnectTokenBytes, protocolID, expireTimestamp, sequence, privateKey, encryptedPrivateToken);
NetcodePublicConnectToken publicToken = new NetcodePublicConnectToken();
publicToken.ProtocolID = protocolID;
publicToken.CreateTimestamp = createTimestamp;
publicToken.ExpireTimestamp = expireTimestamp;
publicToken.ConnectTokenSequence = sequence;
publicToken.PrivateConnectTokenBytes = encryptedPrivateToken;
publicToken.ConnectServers = privateConnectToken.ConnectServers;
publicToken.ClientToServerKey = clientToServerKey;
publicToken.ServerToClientKey = serverToClientKey;
publicToken.TimeoutSeconds = serverTimeout;
byte[] publicTokenBytes = new byte[2048];
using (var writer = ByteArrayReaderWriter.Get(publicTokenBytes))
{
publicToken.Write(writer);
}
return(publicTokenBytes);
}