/// <summary>
/// Accept the client and add to our list of connected clients
/// </summary>
/// <param name="packet">The BMSByte packet received from connecting client</param>
/// <param name="steamId">The SteamId of the connecting client</param>
private void SetupClient(BMSByte packet, SteamId steamId)
{
if (Players.Count == MaxConnections)
{
// Tell the client why they are being disconnected
Send(Error.CreateErrorMessage(Time.Timestep, "Max Players Reached On Server", false, MessageGroupIds.MAX_CONNECTIONS, true));
// Send the close connection frame to the client
Send(new ConnectionClose(Time.Timestep, false, Receivers.Target, MessageGroupIds.DISCONNECT, false));
return;
}
else if (!AcceptingConnections)
{
// Tell the client why they are being disconnected
Send(Error.CreateErrorMessage(Time.Timestep, "The server is busy and not accepting connections", false, MessageGroupIds.MAX_CONNECTIONS, true));
// Send the close connection frame to the client
Send(new ConnectionClose(Time.Timestep, false, Receivers.Target, MessageGroupIds.DISCONNECT, false));
return;
}
// Validate that the connection headers are properly formatted
byte[] response = Websockets.ValidateConnectionHeader(packet.CompressBytes());
// The response will be null if the header sent is invalid, if so then disconnect client as they are sending invalid headers
if (response == null)
{
return;
}
var player = new FacepunchNetworkingPlayer(ServerPlayerCounter++, steamId, false, this);
// If all is in order then send the validated response to the client
Client.Send(response, response.Length, steamId);
OnPlayerConnected(player);
steamPlayers.Add(steamId, player);
// The player has successfully connected
player.Connected = true;
}
/// <summary>
/// Infinite loop listening for new data from all connected clients on a separate thread.
/// This loop breaks when readThreadCancel is set to true
/// </summary>
private void ReadClients()
{
SteamId messageFrom = default;
BMSByte packet = null;
// Intentional infinite loop
while (IsBound)
{
// If the read has been flagged to be canceled then break from this loop
if (readThreadCancel)
{
return;
}
try
{
packet = Client.Receive(out messageFrom);
if (messageFrom == default)
{
Thread.Sleep(1);
continue;
}
if (packet == null)
{
Logging.BMSLog.Log("null packet received from non-null player - should not see me!");
Thread.Sleep(1);
continue;
}
if (PacketLossSimulation > 0.0f && new Random().NextDouble() <= PacketLossSimulation)
{
// Skip this message
continue;
}
BandwidthIn += (ulong)packet.Size;
}
catch (Exception e)
{
Logging.BMSLog.LogException(e);
FacepunchNetworkingPlayer player;
if (steamPlayers.TryGetValue(messageFrom, out player))
{
FinalizeRemovePlayer(player, true);
}
continue;
}
// Check to make sure a message was received
if (packet == null || packet.Size <= 0)
{
continue;
}
if (!steamPlayers.ContainsKey(messageFrom))
{
SetupClient(packet, messageFrom);
continue;
}
else
{
currentReadingPlayer = steamPlayers[messageFrom];
if (!currentReadingPlayer.Accepted && !currentReadingPlayer.PendingAccepted)
{
// It is possible that the response validation was dropped so
// check if the client is resending for a response
byte[] response = Websockets.ValidateConnectionHeader(packet.CompressBytes());
// The client has sent the connection request again
if (response != null)
{
Client.Send(response, response.Length, messageFrom, P2PSend.Reliable);
continue;
}
else
{
currentReadingPlayer.PendingAccepted = true;
ReadPacket(packet);
}
}
else
{
// Due to the Forge Networking protocol, the only time that packet 1
// will be 71 and the second packet be 69 is a forced disconnect reconnect
if (packet[0] == 71 && packet[1] == 69)
{
Logging.BMSLog.LogFormat("Received packet[0]=71 & packet[1]=69");
steamPlayers.Remove(messageFrom);
FinalizeRemovePlayer(currentReadingPlayer, true);
continue;
}
currentReadingPlayer.Ping();
ReadPacket(packet);
}
}
}
}