private void SetupClient(BMSByte packet, string incomingEndpoint, IPEndPoint groupEP)
{
// Check for a local listing request
if (packet.Size.Between(2, 4) && packet[0] == BROADCAST_LISTING_REQUEST_1 && packet[1] == BROADCAST_LISTING_REQUEST_2 && packet[2] == BROADCAST_LISTING_REQUEST_3)
{
// Don't reply if the server is not currently accepting connections
if (!AcceptingConnections)
{
return;
}
// This may be a local listing request so respond with the server flag byte
Client.Send(new byte[] { SERVER_BROADCAST_CODE }, 1, groupEP);
return;
}
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;
}
UDPNetworkingPlayer player = new UDPNetworkingPlayer(ServerPlayerCounter++, incomingEndpoint, false, groupEP, this);
// If all is in order then send the validated response to the client
Client.Send(response, response.Length, groupEP);
OnPlayerConnected(player);
udpPlayers.Add(incomingEndpoint, player);
// The player has successfully connected
player.Connected = true;
}
private void HandleMaximumClientPacketResponse(string incomingEndpoint, IPEndPoint groupEP)
{
// Tell the client why they are being disconnected
Error frame = Error.CreateErrorMessage(Time.Timestep, "Max Players Reached On Server",
false, MessageGroupIds.MAX_CONNECTIONS, false);
var playerToDisconnect = new UDPNetworkingPlayer(ServerPlayerCounter++, incomingEndpoint,
false, groupEP, this);
UDPPacketComposer.SendNewUDPPacket(this, playerToDisconnect, frame, false);
// Send the close connection frame to the client
UDPPacketComposer.SendNewUDPPacket(this, playerToDisconnect,
new ConnectionClose(Time.Timestep, false, Receivers.Target,
MessageGroupIds.DISCONNECT, false), false);
}
private void HandleNotAcceptingConnectionsPacketResponse(string incomingEndpoint, IPEndPoint groupEP)
{
// Tell the client why they are being disconnected
var frame = Error.CreateErrorMessage(Time.Timestep,
"The server is busy and not accepting connections", false,
MessageGroupIds.NOT_ACCEPT_CONNECTIONS, false);
var playerToDisconnect = new UDPNetworkingPlayer(ServerPlayerCounter++,
incomingEndpoint, false, groupEP, this);
UDPPacketComposer.SendNewUDPPacket(this, playerToDisconnect, frame, false);
// Send the close connection frame to the client
UDPPacketComposer.SendNewUDPPacket(this, playerToDisconnect,
new ConnectionClose(Time.Timestep, false, Receivers.Target,
MessageGroupIds.DISCONNECT, false), false);
}
private void HandleClientAcceptance(BMSByte packet, string incomingEndpoint, IPEndPoint groupEP)
{
// 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 UDPNetworkingPlayer(ServerPlayerCounter++, incomingEndpoint,
false, groupEP, this);
// If all is in order then send the validated response to the client
Client.Send(response, response.Length, groupEP);
OnPlayerConnected(player);
udpPlayers.Add(incomingEndpoint, 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>
/// <summary>
///无限循环在单独的线程上监听来自所有连接客户端的新数据。
///当readThreadCancel设置为true时，此循环中断
/// </ summary>
private void ReadClients()
{
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 0);
string incomingEndpoint = string.Empty;
BMSByte packet = null;
// 故意无限循环
// Intentional infinite loop
while (IsBound)
{
//如果读取已被标记为取消，则从此循环中断开
// If the read has been flagged to be canceled then break from this loop
if (readThreadCancel)
{
return;
}
try
{
//从网络读取数据包
// Read a packet from the network
packet = Client.Receive(ref groupEP, ref incomingEndpoint);
// 模拟丢包
if (PacketLossSimulation > 0.0f && new Random().NextDouble() <= PacketLossSimulation)
{
// 丢掉这个消息
// Skip this message
continue;
}
// 统计 宽带接收数据大小
BandwidthIn += (ulong)packet.Size;
}
catch
{
// 如果出错， 就查找该IP PROT的玩家，将该玩家踢掉
UDPNetworkingPlayer player;
if (udpPlayers.TryGetValue(incomingEndpoint, out player))
{
FinalizeRemovePlayer(player, true);
}
continue;
}
//检查以确保收到消息
// Check to make sure a message was received
if (packet == null || packet.Size <= 0)
{
continue;
}
//如果玩家列表里不包含该包的发送者
if (!udpPlayers.ContainsKey(incomingEndpoint))
{
// 创建该发送者的结构体保存 UDPNetworkingPlayer
SetupClient(packet, incomingEndpoint, groupEP);
continue;
}
else
{
currentReadingPlayer = udpPlayers[incomingEndpoint];
if (!currentReadingPlayer.Accepted && !currentReadingPlayer.PendingAccepted)
{
//响应验证可能会被丢弃
//检查客户端是否正在重新发送响应
// 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());
//客户端再次发送连接请求
// The client has sent the connection request again
if (response != null)
{
Client.Send(response, response.Length, groupEP);
continue;
}
else
{
// 将该玩家设置为等待接受确认
currentReadingPlayer.PendingAccepted = true;
// 读取该玩家发来的数据包
ReadPacket(packet);
}
}
else
{
//由于Forge网络协议，数据包唯一的时间1
//将是71，第二个数据包是69是强制断开连接
// 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)
{
udpPlayers.Remove(currentReadingPlayer.Ip + "+" + currentReadingPlayer.Port);
FinalizeRemovePlayer(currentReadingPlayer, true);
continue;
}
// 设置玩家最好ping时间
currentReadingPlayer.Ping();
// 读取该玩家发来的数据包
ReadPacket(packet);
}
}
}
}
/// <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()
{
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 0);
string incomingEndpoint = string.Empty;
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
{
// Read a packet from the network
packet = Client.Receive(ref groupEP, ref incomingEndpoint);
if (PacketLossSimulation > 0.0f && new Random().NextDouble() <= PacketLossSimulation)
{
// Skip this message
continue;
}
BandwidthIn += (ulong)packet.Size;
}
catch
{
UDPNetworkingPlayer player;
if (udpPlayers.TryGetValue(incomingEndpoint, out player))
{
FinalizeRemovePlayer(player, true);
}
continue;
}
// Check to make sure a message was received
if (packet == null || packet.Size <= 0)
{
continue;
}
if (!udpPlayers.ContainsKey(incomingEndpoint))
{
SetupClient(packet, incomingEndpoint, groupEP);
continue;
}
else
{
currentReadingPlayer = udpPlayers[incomingEndpoint];
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, groupEP);
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)
{
udpPlayers.Remove(currentReadingPlayer.Ip + "+" + currentReadingPlayer.Port);
FinalizeRemovePlayer(currentReadingPlayer, true);
continue;
}
currentReadingPlayer.Ping();
ReadPacket(packet);
}
}
}
}
/// <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()
{
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 0);
string incomingEndpoint = string.Empty;
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
{
// Read a packet from the network
packet = Client.Receive(ref groupEP, ref incomingEndpoint);
if (PacketLossSimulation > 0.0f && new Random().NextDouble() <= PacketLossSimulation)
{
// Skip this message
continue;
}
BandwidthIn += (ulong)packet.Size;
}
catch (Exception ex) when(!(ex is SocketException))
{
Console.WriteLine($"Error in ReadClients() infinite loop, error was {ex.Message}");
UDPNetworkingPlayer player;
if (udpPlayers.TryGetValue(incomingEndpoint, out player))
{
Console.WriteLine($"Following the error, player '{player.NetworkId}' will be removed");
FinalizeRemovePlayer(player, true);
}
continue;
}
// Check to make sure a message was received
if (packet == null || packet.Size <= 0)
{
continue;
}
if (!udpPlayers.ContainsKey(incomingEndpoint))
{
SetupClient(packet, incomingEndpoint, groupEP);
continue;
}
else
{
currentReadingPlayer = udpPlayers[incomingEndpoint];
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, groupEP);
continue;
}
else
{
currentReadingPlayer.PendingAccepted = true;
ReadPacket(packet);
}
}
else
{
currentReadingPlayer.Ping();
ReadPacket(packet);
}
}
}
}
/// <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()
{
IPEndPoint groupEP = new IPEndPoint(IPAddress.Any, 0);
string incomingEndpoint = string.Empty;
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
{
// Read a packet from the network
packet = Client.Receive(ref groupEP, ref incomingEndpoint);
if (PacketLossSimulation > 0.0f && new Random().NextDouble() <= PacketLossSimulation)
{
// Skip this message
continue;
}
BandwidthIn += (ulong)packet.Size;
}
catch
{
if (udpPlayers.ContainsKey(incomingEndpoint))
{
Disconnect(udpPlayers[incomingEndpoint], true);
CleanupDisconnections();
}
continue;
}
// Check to make sure a message was received
if (packet == null || packet.Size <= 0)
{
continue;
}
if (!udpPlayers.ContainsKey(incomingEndpoint))
{
SetupClient(packet, incomingEndpoint, groupEP);
continue;
}
else
{
currentReadingPlayer = udpPlayers[incomingEndpoint];
if (!currentReadingPlayer.Accepted && !currentReadingPlayer.PendingAccpeted)
{
// 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, groupEP);
continue;
}
else
{
currentReadingPlayer.PendingAccpeted = true;
ReadPacket(packet);
}
}
else
{
ReadPacket(packet);
}
}
}
}
