private void OnMaxConnectionsPerIPExceeded(UdpSession s)
{
if (s != null && s.IsRunning)
{
s.RaiseError("", "Client host rejected: too many connections from your IP(" + s.RemoteEndPoint.Address + "), please try again later.");
}
}
public override void SessionCreated(UdpSession session)
{
base.SessionCreated(session);
ServerToken = (ServerRoomToken)session.GetProtocolToken();
ProcessServerLaunchState(ServerLaunchState.SessionCreated);
}
private void OnMaxConnectionsExceeded(UdpSession s)
{
if (s != null && s.IsRunning)
{
s.RaiseError("", "Client host rejected: too many connections, please try again later.");
}
}
public void NotifySessionAuthenticated(UdpSession s)
{
var e = s.RemoteEndPoint;
SessionSets.DoAction
(
ss =>
{
if (ss.IpSessions.ContainsKey(e.Address))
{
var isi = ss.IpSessions[e.Address];
if (!isi.Authenticated.Contains(s))
{
isi.Authenticated.Add(s);
}
}
}
);
}
public void NotifySessionQuit(UdpSession s)
{
PurifyConsumer.Push(s);
}
public void Start()
{
var Success = false;
try
{
IsRunningValue.Update
(
b =>
{
if (b)
{
throw new InvalidOperationException();
}
if (BindingsValue.Length == 0)
{
throw new Exception("NoValidBinding");
}
ListeningTaskTokenSource = new CancellationTokenSource();
var ListeningTaskToken = ListeningTaskTokenSource.Token;
Action <UdpSession> Purify = StoppingSession =>
{
SessionSets.DoAction
(
ss =>
{
if (ss.Sessions.Contains(StoppingSession))
{
ss.Sessions.Remove(StoppingSession);
var IpAddress = StoppingSession.RemoteEndPoint.Address;
var isi = ss.IpSessions[IpAddress];
if (isi.Authenticated.Contains(StoppingSession))
{
isi.Authenticated.Remove(StoppingSession);
}
isi.Count -= 1;
if (isi.Count == 0)
{
ss.IpSessions.Remove(IpAddress);
}
var SessionId = StoppingSession.SessionId;
ss.SessionIdToSession.Remove(SessionId);
}
}
);
StoppingSession.Dispose();
};
Action <AcceptingInfo> Accept = a =>
{
var ep = a.RemoteEndPoint;
UdpSession s = null;
try
{
var Buffer = a.ReadBuffer;
if (Buffer.Length < 12)
{
return;
}
var SessionId = Buffer[0] | ((Int32)(Buffer[1]) << 8) | ((Int32)(Buffer[2]) << 16) | ((Int32)(Buffer[3]) << 24);
var Flag = Buffer[4] | ((Int32)(Buffer[5]) << 8);
var Index = Buffer[6] | ((Int32)(Buffer[7]) << 8);
var Verification = Buffer[8] | ((Int32)(Buffer[9]) << 8) | ((Int32)(Buffer[10]) << 16) | ((Int32)(Buffer[11]) << 24);
Buffer[8] = 0;
Buffer[9] = 0;
Buffer[10] = 0;
Buffer[11] = 0;
if (ServerContext.EnableLogTransport)
{
//按Flag中是否包含AUX分别生成日志
if ((Flag & 8) != 0)
{
ServerContext.RaiseSessionLog(new SessionLogEntry {
Token = SessionId.ToString("X8"), RemoteEndPoint = ep, Time = DateTime.UtcNow, Type = "UdpTransport", Name = "ReceiveAux", Message = "AckIndex: " + Index.ToInvariantString() + " Length: " + Buffer.Length.ToInvariantString()
});
}
else
{
ServerContext.RaiseSessionLog(new SessionLogEntry {
Token = SessionId.ToString("X8"), RemoteEndPoint = ep, Time = DateTime.UtcNow, Type = "UdpTransport", Name = "Receive", Message = "Index: " + Index.ToInvariantString() + " Length: " + Buffer.Length.ToInvariantString()
});
}
}
//如果Flag中不包含ENC，则验证CRC32
if ((Flag & 2) == 0)
{
if (Cryptography.CRC32(Buffer) != Verification)
{
if (ServerContext.EnableLogTransport)
{
ServerContext.RaiseSessionLog(new SessionLogEntry {
Token = SessionId.ToString("X8"), RemoteEndPoint = ep, Time = DateTime.UtcNow, Type = "UdpTransport", Name = "Receive", Message = "Index: " + Index.ToInvariantString() + " CRC32Failed"
});
}
return;
}
}
//如果Flag中包含INI，则初始化
if ((Flag & 4) != 0)
{
if ((Flag & 1) != 0)
{
return;
}
if ((Flag & 2) != 0)
{
return;
}
if ((Flag & 8) != 0)
{
return;
}
var Offset = 12;
s = new UdpSession(this, a.Socket, ep, VirtualTransportServerFactory, QueueUserWorkItem);
SessionId = s.SessionId;
if (MaxConnectionsValue.HasValue && (SessionSets.Check(ss => ss.Sessions.Count) >= MaxConnectionsValue.Value))
{
PurifyConsumer.DoOne();
}
if (MaxConnectionsValue.HasValue && (SessionSets.Check(ss => ss.Sessions.Count) >= MaxConnectionsValue.Value))
{
try
{
s.Start();
OnMaxConnectionsExceeded(s);
}
finally
{
s.Dispose();
}
return;
}
if (MaxConnectionsPerIPValue.HasValue && (SessionSets.Check(ss => ss.IpSessions.ContainsKey(ep.Address) ? ss.IpSessions[ep.Address].Count : 0) >= MaxConnectionsPerIPValue.Value))
{
try
{
s.Start();
OnMaxConnectionsPerIPExceeded(s);
}
finally
{
PurifyConsumer.Push(s);
}
return;
}
if (MaxUnauthenticatedPerIPValue.HasValue && (SessionSets.Check(ss => ss.IpSessions.ContainsKey(ep.Address) ? (ss.IpSessions[ep.Address].Count - ss.IpSessions[ep.Address].Authenticated.Count) : 0) >= MaxUnauthenticatedPerIPValue.Value))
{
try
{
s.Start();
OnMaxConnectionsPerIPExceeded(s);
}
finally
{
PurifyConsumer.Push(s);
}
return;
}
SessionSets.DoAction
(
ss =>
{
ss.Sessions.Add(s);
if (ss.IpSessions.ContainsKey(ep.Address))
{
ss.IpSessions[ep.Address].Count += 1;
}
else
{
var isi = new IpSessionInfo();
isi.Count += 1;
ss.IpSessions.Add(ep.Address, isi);
}
while ((SessionId == 0) || ss.SessionIdToSession.ContainsKey(SessionId))
{
s = new UdpSession(this, a.Socket, ep, VirtualTransportServerFactory, QueueUserWorkItem);
SessionId = s.SessionId;
}
ss.SessionIdToSession.Add(SessionId, s);
}
);
s.Start();
s.PrePush(() =>
{
if (!s.Push(ep, Index, null, Buffer, Offset, Buffer.Length - Offset))
{
PurifyConsumer.Push(s);
}
});
}
else
{
var Close = false;
SessionSets.DoAction
(
ss =>
{
if (!ss.SessionIdToSession.ContainsKey(SessionId))
{
Close = true;
return;
}
s = ss.SessionIdToSession[SessionId];
}
);
if (Close)
{
return;
}
s.PrePush(() =>
{
var IsEncrypted = (Flag & 2) != 0;
var NextSecureContext = s.NextSecureContext;
var SecureContext = s.SecureContext;
if ((SecureContext == null) && (NextSecureContext != null))
{
s.SecureContext = NextSecureContext;
s.NextSecureContext = null;
SecureContext = NextSecureContext;
NextSecureContext = null;
}
if ((SecureContext != null) != IsEncrypted)
{
return;
}
if (IsEncrypted)
{
var Key = SecureContext.ClientToken.Concat(Cryptography.SHA256(Buffer.Skip(4).Take(4)));
var HMACBytes = Cryptography.HMACSHA256Simple(Key, Buffer).Take(4).ToArray();
var HMAC = HMACBytes[0] | ((Int32)(HMACBytes[1]) << 8) | ((Int32)(HMACBytes[2]) << 16) | ((Int32)(HMACBytes[3]) << 24);
if (HMAC != Verification)
{
if (ServerContext.EnableLogTransport)
{
ServerContext.RaiseSessionLog(new SessionLogEntry {
Token = SessionId.ToString("X8"), RemoteEndPoint = ep, Time = DateTime.UtcNow, Type = "UdpTransport", Name = "Receive", Message = "Index: " + Index.ToInvariantString() + " HMACFailed"
});
}
return;
}
}
var Offset = 12;
int[] Indices = null;
if ((Flag & 1) != 0)
{
if (Buffer.Length < 14)
{
return;
}
var NumIndex = Buffer[Offset] | ((Int32)(Buffer[Offset + 1]) << 8);
if (Buffer.Length < 14 + NumIndex * 2)
{
return;
}
if (NumIndex > UdpSession.WritingWindowSize) //若Index数量较大，则丢弃包
{
return;
}
Offset += 2;
Indices = new int[NumIndex];
for (int k = 0; k < NumIndex; k += 1)
{
Indices[k] = Buffer[Offset + k * 2] | ((Int32)(Buffer[Offset + k * 2 + 1]) << 8);
}
Offset += NumIndex * 2;
}
//如果Flag中包含AUX，则判断
if ((Flag & 8) != 0)
{
if (Indices == null)
{
return;
}
if (Indices.Length < 1)
{
return;
}
if (Index != Indices[0])
{
return;
}
if (Offset != Buffer.Length)
{
return;
}
}
var PreviousRemoteEndPoint = s.RemoteEndPoint;
if (!PreviousRemoteEndPoint.Equals(ep))
{
SessionSets.DoAction
(
ss =>
{
var Authenticated = false;
{
var PreviousIpAddress = PreviousRemoteEndPoint.Address;
var isi = ss.IpSessions[PreviousIpAddress];
if (isi.Authenticated.Contains(s))
{
isi.Authenticated.Remove(s);
Authenticated = true;
}
isi.Count -= 1;
if (isi.Count == 0)
{
ss.IpSessions.Remove(PreviousIpAddress);
}
}
{
IpSessionInfo isi;
if (ss.IpSessions.ContainsKey(ep.Address))
{
isi = ss.IpSessions[ep.Address];
isi.Count += 1;
}
else
{
isi = new IpSessionInfo();
isi.Count += 1;
ss.IpSessions.Add(ep.Address, isi);
}
if (Authenticated)
{
isi.Authenticated.Add(s);
}
}
s.RemoteEndPoint = ep;
}
);
}
if ((Flag & 8) != 0)
{
if (!s.PushAux(ep, Indices))
{
PurifyConsumer.Push(s);
}
}
else
{
if (!s.Push(ep, Index, Indices, Buffer, Offset, Buffer.Length - Offset))
{
PurifyConsumer.Push(s);
}
}
});
}
}
catch (Exception ex)
{
if (ServerContext.EnableLogSystem)
{
ServerContext.RaiseSessionLog(new SessionLogEntry {
Token = "", RemoteEndPoint = ep, Time = DateTime.UtcNow, Type = "Sys", Name = "Exception", Message = ExceptionInfo.GetExceptionInfo(ex)
});
}
if (s != null)
{
PurifyConsumer.Push(s);
}
}
};
AcceptConsumer = new AsyncConsumer <AcceptingInfo>(QueueUserWorkItem, a => { Accept(a); return(true); }, int.MaxValue);
var Exceptions = new List <Exception>();
var Bindings = new List <IPEndPoint>();
//将所有默认地址换为实际的所有接口地址
foreach (var Binding in BindingsValue)
{
if (IPAddress.Equals(Binding.Address, IPAddress.Any) || IPAddress.Equals(Binding.Address, IPAddress.IPv6Any))
{
foreach (var ni in NetworkInterface.GetAllNetworkInterfaces())
{
foreach (var a in ni.GetIPProperties().UnicastAddresses)
{
if (a.Address.AddressFamily == Binding.Address.AddressFamily)
{
Bindings.Add(new IPEndPoint(a.Address, Binding.Port));
}
}
}
}
else
{
Bindings.Add(Binding);
}
}
foreach (var Binding in Bindings)
{
Func <Socket> CreateSocket = () =>
{
var s = new Socket(Binding.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
//在Windows下关闭SIO_UDP_CONNRESET报告，防止接受数据出错
//http://support.microsoft.com/kb/263823/en-us
if (System.Environment.OSVersion.Platform == PlatformID.Win32NT)
{
uint IOC_IN = 0x80000000;
uint IOC_VENDOR = 0x18000000;
uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;
s.IOControl(unchecked ((int)(SIO_UDP_CONNRESET)), new byte[] { Convert.ToByte(false) }, null);
}
return(s);
};
var Socket = CreateSocket();
try
{
Socket.Bind(Binding);
}
catch (SocketException ex)
{
Exceptions.Add(ex);
continue;
}
var BindingInfo = new BindingInfo();
BindingInfo.EndPoint = Binding;
BindingInfo.Socket = new LockedVariable <Socket>(Socket);
Func <SocketAsyncEventArgs, Boolean> Completed = args =>
{
try
{
if (ListeningTaskToken.IsCancellationRequested)
{
return(false);
}
if (args.SocketError == SocketError.Success)
{
var Count = args.BytesTransferred;
var ReadBuffer = new Byte[Count];
Array.Copy(BindingInfo.ReadBuffer, ReadBuffer, Count);
var a = new AcceptingInfo {
Socket = BindingInfo.Socket.Check(s => s), ReadBuffer = ReadBuffer, RemoteEndPoint = (IPEndPoint)(args.RemoteEndPoint)
};
AcceptConsumer.Push(a);
}
else
{
BindingInfo.Socket.Update
(
OriginalSocket =>
{
try
{
OriginalSocket.Dispose();
}
catch (Exception)
{
}
var NewSocket = CreateSocket();
NewSocket.Bind(Binding);
return(NewSocket);
}
);
}
}
finally
{
args.Dispose();
}
BindingInfo.Start();
return(true);
};
BindingInfo.ListenConsumer = new AsyncConsumer <SocketAsyncEventArgs>(QueueUserWorkItem, Completed, 1);
BindingInfo.Start = () =>
{
var EventArgs = new SocketAsyncEventArgs();
EventArgs.RemoteEndPoint = new IPEndPoint(Binding.Address.AddressFamily == AddressFamily.InterNetworkV6 ? IPAddress.IPv6Any : IPAddress.Any, 0);
EventArgs.SetBuffer(BindingInfo.ReadBuffer, 0, BindingInfo.ReadBuffer.Length);
var bs = BindingInfo.Socket.Check(s => s);
EventArgs.Completed += (o, args) => BindingInfo.ListenConsumer.Push(args);
try
{
if (!bs.ReceiveFromAsync(EventArgs))
{
BindingInfo.ListenConsumer.Push(EventArgs);
}
}
catch (ObjectDisposedException)
{
}
};
BindingInfos.Add(BindingInfo);
}
if (BindingInfos.Count == 0)
{
throw new AggregateException(Exceptions);
}
PurifyConsumer = new AsyncConsumer <UdpSession>(PurifierQueueUserWorkItem, s => { Purify(s); return(true); }, int.MaxValue);
if (UnauthenticatedSessionIdleTimeoutValue.HasValue || SessionIdleTimeoutValue.HasValue)
{
var TimePeriod = TimeSpan.FromSeconds(Math.Max(TimeoutCheckPeriodValue, 1));
LastActiveTimeCheckTimer = new Timer(state =>
{
if (UnauthenticatedSessionIdleTimeoutValue.HasValue)
{
var CheckTime = DateTime.UtcNow.AddIntSeconds(-UnauthenticatedSessionIdleTimeoutValue.Value);
SessionSets.DoAction
(
ss =>
{
foreach (var s in ss.Sessions)
{
var IpAddress = s.RemoteEndPoint.Address;
var isi = ss.IpSessions[IpAddress];
if (!isi.Authenticated.Contains(s))
{
if (s.LastActiveTime < CheckTime)
{
PurifyConsumer.Push(s);
}
}
}
}
);
}
if (SessionIdleTimeoutValue.HasValue)
{
var CheckTime = DateTime.UtcNow.AddIntSeconds(-SessionIdleTimeoutValue.Value);
SessionSets.DoAction
(
ss =>
{
foreach (var s in ss.Sessions)
{
var IpAddress = s.RemoteEndPoint.Address;
var isi = ss.IpSessions[IpAddress];
if (isi.Authenticated.Contains(s))
{
if (s.LastActiveTime < CheckTime)
{
PurifyConsumer.Push(s);
}
}
}
}
);
}
}, null, TimePeriod, TimePeriod);
}
foreach (var BindingInfo in BindingInfos)
{
BindingInfo.Start();
}
Success = true;
return(true);
}
);
}
finally
{
if (!Success)
{
Stop();
}
}
}
public override void SessionCreated(UdpSession session)
{
base.SessionCreated(session);
HandleRoomCreation((ServerRoomToken)session.GetProtocolToken());
}
