// the listener thread's listen function
// note: no maxConnections parameter. high level API should handle that.
// (Transport can't send a 'too full' message anyway)
void Listen(int port)
{
// absolutely must wrap with try/catch, otherwise thread
// exceptions are silent
try
{
// start listener on all IPv4 and IPv6 address via .Create
listener = TcpListener.Create(port);
listener.Server.NoDelay = NoDelay;
listener.Server.SendTimeout = SendTimeout;
listener.Server.ReceiveTimeout = ReceiveTimeout;
listener.Start();
Log.Info("Server: listening port=" + port);
// keep accepting new clients
while (true)
{
try
{
// wait and accept new client
// note: 'using' sucks here because it will try to
// dispose after thread was started but we still need it
// in the thread
TcpClient client = listener.AcceptTcpClient();
// set socket options
client.NoDelay = NoDelay;
client.SendTimeout = SendTimeout;
client.ReceiveTimeout = ReceiveTimeout;
// generate the next connection id (thread safely)
int connectionId = NextConnectionId();
// add to dict immediately
ConnectionState connection = new ConnectionState(client, MaxMessageSize);
clients[connectionId] = connection;
// spawn a send thread for each client
Thread sendThread = new Thread(() =>
{
// wrap in try-catch, otherwise Thread exceptions
// are silent
try
{
// run the send loop
// IMPORTANT: DO NOT SHARE STATE ACROSS MULTIPLE THREADS!
ThreadFunctions.SendLoop(connectionId, client, connection.sendPipe, connection.sendPending);
}
catch (ThreadAbortException)
{
// happens on stop. don't log anything.
// (we catch it in SendLoop too, but it still gets
// through to here when aborting. don't show an
// error.)
}
catch (Exception exception)
{
Log.Error("Server send thread exception: " + exception);
}
});
sendThread.IsBackground = true;
sendThread.Start();
// spawn a receive thread for each client
Thread receiveThread = new Thread(() =>
{
// wrap in try-catch, otherwise Thread exceptions
// are silent
try
{
// run the receive loop
// (receive pipe is shared across all loops)
ThreadFunctions.ReceiveLoop(connectionId, client, MaxMessageSize, receivePipe, ReceiveQueueLimit);
// IMPORTANT: do NOT remove from clients after the
// thread ends. need to do it in Tick() so that the
// disconnect event in the pipe is still processed.
// (removing client immediately would mean that the
// pipe is lost and the disconnect event is never
// processed)
// sendthread might be waiting on ManualResetEvent,
// so let's make sure to end it if the connection
// closed.
// otherwise the send thread would only end if it's
// actually sending data while the connection is
// closed.
sendThread.Interrupt();
}
catch (Exception exception)
{
Log.Error("Server client thread exception: " + exception);
}
});
receiveThread.IsBackground = true;
receiveThread.Start();
}
catch (SocketException exception)
{
if (exception.ErrorCode == 10035) // WSAEWOULDBLOCK, don't stop server thread
{
//Log.Info ("Caught WSAEWOULDBLOCK, yielding and retrying later...");
Thread.Yield();
}
else
{
throw exception;
}
}
}
}
catch (ThreadAbortException exception)
{
// UnityEditor causes AbortException if thread is still
// running when we press Play again next time. that's okay.
Log.Info("Server thread aborted. That's okay. " + exception);
}
catch (SocketException exception)
{
// calling StopServer will interrupt this thread with a
// 'SocketException: interrupted'. that's okay.
Log.Info("Server Thread stopped. That's okay. " + exception);
}
catch (Exception exception)
{
// something went wrong. probably important.
Log.Error("Server Exception: " + exception);
}
}
// the thread function
// STATIC to avoid sharing state!
// => pass ClientState object. a new one is created for each new thread!
// => avoids data races where an old dieing thread might still modify
// the current thread's state :/
static void ReceiveThreadFunction(ClientConnectionState state, string ip, int port, int MaxMessageSize, bool NoDelay, int SendTimeout, int ReceiveTimeout, int ReceiveQueueLimit)
{
Thread sendThread = null;
// absolutely must wrap with try/catch, otherwise thread
// exceptions are silent
try
{
// connect (blocking)
state.client.Connect(ip, port);
state.Connecting = false; // volatile!
// set socket options after the socket was created in Connect()
// (not after the constructor because we clear the socket there)
state.client.NoDelay = NoDelay;
state.client.SendTimeout = SendTimeout;
state.client.ReceiveTimeout = ReceiveTimeout;
// start send thread only after connected
// IMPORTANT: DO NOT SHARE STATE ACROSS MULTIPLE THREADS!
sendThread = new Thread(() => { ThreadFunctions.SendLoop(0, state.client, state.sendPipe, state.sendPending); });
sendThread.IsBackground = true;
sendThread.Start();
// run the receive loop
// (receive pipe is shared across all loops)
ThreadFunctions.ReceiveLoop(0, state.client, MaxMessageSize, state.receivePipe, ReceiveQueueLimit);
}
catch (SocketException exception)
{
// this happens if (for example) the ip address is correct
// but there is no server running on that ip/port
Log.Info("Client Recv: failed to connect to ip=" + ip + " port=" + port + " reason=" + exception);
// add 'Disconnected' event to receive pipe so that the caller
// knows that the Connect failed. otherwise they will never know
state.receivePipe.Enqueue(0, EventType.Disconnected, default);
}
catch (ThreadInterruptedException)
{
// expected if Disconnect() aborts it
}
catch (ThreadAbortException)
{
// expected if Disconnect() aborts it
}
catch (ObjectDisposedException)
{
// expected if Disconnect() aborts it and disposed the client
// while ReceiveThread is in a blocking Connect() call
}
catch (Exception exception)
{
// something went wrong. probably important.
Log.Error("Client Recv Exception: " + exception);
}
// sendthread might be waiting on ManualResetEvent,
// so let's make sure to end it if the connection
// closed.
// otherwise the send thread would only end if it's
// actually sending data while the connection is
// closed.
sendThread?.Interrupt();
// Connect might have failed. thread might have been closed.
// let's reset connecting state no matter what.
state.Connecting = false;
// if we got here then we are done. ReceiveLoop cleans up already,
// but we may never get there if connect fails. so let's clean up
// here too.
state.client?.Close();
}
// the thread function
// STATIC to avoid sharing state!
// => pass ClientState object. a new one is created for each new thread!
// => avoids data races where an old dieing thread might still modify
// the current thread's state :/
static void ReceiveThreadFunction(ClientState state, string ip, int port, int MaxMessageSize, bool NoDelay, int SendTimeout, int QueueLimit)
{
Thread sendThread = null;
// absolutely must wrap with try/catch, otherwise thread
// exceptions are silent
try
{
// connect (blocking)
client.Connect(ip, port);
Stream stream = client.GetStream();
if (_Encrypted)
{
RemoteCertificateValidationCallback trustCert = (object sender, X509Certificate x509Certificate,
X509Chain x509Chain, SslPolicyErrors policyErrors) =>
{
if (_AcceptSelfSignedCert)
{
// All certificates are accepted
return(true);
}
else
{
if (policyErrors == SslPolicyErrors.None)
{
return(true);
}
else
{
return(false);
}
}
};
SslStream encryptedStream = new SslStream(client.GetStream(), false, trustCert, null);
stream = encryptedStream;
encryptedStream.AuthenticateAsClient(ip);
}
_Connecting = false;
state.client.Connect(ip, port);
state.Connecting = false; // volatile!
// set socket options after the socket was created in Connect()
// (not after the constructor because we clear the socket there)
state.client.NoDelay = NoDelay;
state.client.SendTimeout = SendTimeout;
// start send thread only after connected
// IMPORTANT: DO NOT SHARE STATE ACROSS MULTIPLE THREADS!
sendThread = new Thread(() => { ThreadFunctions.SendLoop(0, state.client, state.sendPipe, state.sendPending); });
sendThread.IsBackground = true;
sendThread.Start();
// run the receive loop
// IMPORTANT: DO NOT SHARE STATE ACROSS MULTIPLE THREADS!
ThreadFunctions.ReceiveLoop(0, state.client, MaxMessageSize, state.receivePipe, QueueLimit);
}
catch (SocketException exception)
{
// this happens if (for example) the ip address is correct
// but there is no server running on that ip/port
Log.Info("Client Recv: failed to connect to ip=" + ip + " port=" + port + " reason=" + exception);
// set 'Disconnected' event to receive pipe so that the caller
// knows that the Connect failed. otherwise they will never know
state.receivePipe.SetDisconnected();
}
catch (ThreadInterruptedException)
{
// expected if Disconnect() aborts it
}
catch (ThreadAbortException)
{
// expected if Disconnect() aborts it
}
catch (ObjectDisposedException)
{
// expected if Disconnect() aborts it and disposed the client
// while ReceiveThread is in a blocking Connect() call
}
catch (Exception exception)
{
// something went wrong. probably important.
Log.Error("Client Recv Exception: " + exception);
}
// sendthread might be waiting on ManualResetEvent,
// so let's make sure to end it if the connection
// closed.
// otherwise the send thread would only end if it's
// actually sending data while the connection is
// closed.
sendThread?.Interrupt();
// Connect might have failed. thread might have been closed.
// let's reset connecting state no matter what.
state.Connecting = false;
// if we got here then we are done. ReceiveLoop cleans up already,
// but we may never get there if connect fails. so let's clean up
// here too.
state.client?.Close();
}
// the listener thread's listen function
// note: no maxConnections parameter. high level API should handle that.
// (Transport can't send a 'too full' message anyway)
void Listen(int port)
{
// absolutely must wrap with try/catch, otherwise thread
// exceptions are silent
try
{
// start listener on all IPv4 and IPv6 address via .Create
listener = TcpListener.Create(port);
listener.Server.NoDelay = NoDelay;
// IMPORTANT: do not set send/receive timeouts on listener.
// On linux setting the recv timeout will cause the blocking
// Accept call to timeout with EACCEPT (which mono interprets
// as EWOULDBLOCK).
// https://stackoverflow.com/questions/1917814/eagain-error-for-accept-on-blocking-socket/1918118#1918118
// => fixes https://github.com/vis2k/Mirror/issues/2695
//
// listener.Server.SendTimeout = SendTimeout;
// listener.Server.ReceiveTimeout = ReceiveTimeout;
listener.Start();
Log.Info("Server: listening port=" + port);
// keep accepting new clients
while (true)
{
// wait and accept new client
// note: 'using' sucks here because it will try to
// dispose after thread was started but we still need it
// in the thread
TcpClient client = listener.AcceptTcpClient();
// set socket options
client.NoDelay = NoDelay;
//client.SendTimeout = SendTimeout;
//client.ReceiveTimeout = ReceiveTimeout;
// generate the next connection id (thread safely)
int connectionId = NextConnectionId();
// add to dict immediately
var connection = new ChicasPlayer(client, MaxMessageSize);
connection.OwnerID = connectionId;
clients[connectionId] = connection;
// spawn a send thread for each client
Thread sendThread = new Thread(() =>
{
// wrap in try-catch, otherwise Thread exceptions
// are silent
try
{
// run the send loop
// IMPORTANT: DO NOT SHARE STATE ACROSS MULTIPLE THREADS!
ThreadFunctions.SendLoop(connectionId, client, connection.sendPipe, connection.sendPending);
}
catch (ThreadAbortException)
{
// happens on stop. don't log anything.
// (we catch it in SendLoop too, but it still gets
// through to here when aborting. don't show an
// error.)
}
catch (Exception exception)
{
Log.Error("Server send thread exception: " + exception);
}
});
sendThread.IsBackground = true;
sendThread.Start();
// spawn a receive thread for each client
Thread receiveThread = new Thread(() =>
{
// wrap in try-catch, otherwise Thread exceptions
// are silent
try
{
// run the receive loop
// (receive pipe is shared across all loops)
ThreadFunctions.ReceiveLoop(connectionId, client, MaxMessageSize, receivePipe, ReceiveQueueLimit);
// IMPORTANT: do NOT remove from clients after the
// thread ends. need to do it in Tick() so that the
// disconnect event in the pipe is still processed.
// (removing client immediately would mean that the
// pipe is lost and the disconnect event is never
// processed)
// sendthread might be waiting on ManualResetEvent,
// so let's make sure to end it if the connection
// closed.
// otherwise the send thread would only end if it's
// actually sending data while the connection is
// closed.
sendThread.Interrupt();
}
catch (Exception exception)
{
Log.Error("Server client thread exception: " + exception);
}
});
receiveThread.IsBackground = true;
receiveThread.Start();
}
}
catch (ThreadAbortException exception)
{
// UnityEditor causes AbortException if thread is still
// running when we press Play again next time. that's okay.
Log.Info("Server thread aborted. That's okay. " + exception);
}
catch (SocketException exception)
{
// calling StopServer will interrupt this thread with a
// 'SocketException: interrupted'. that's okay.
Log.Info("Server Thread stopped. That's okay. " + exception);
}
catch (Exception exception)
{
// something went wrong. probably important.
Log.Error("Server Exception: " + exception);
}
}
// the listener thread's listen function
// note: no maxConnections parameter. high level API should handle that.
// (Transport can't send a 'too full' message anyway)
void Listen(int port)
{
// absolutely must wrap with try/catch, otherwise thread
// exceptions are silent
try
{
// start listener on all IPv4 and IPv6 address via .Create
listener = TcpListener.Create(port);
listener.Server.NoDelay = NoDelay;
listener.Server.SendTimeout = SendTimeout;
listener.Start();
Log.Info("Server: listening port=" + port);
X509Certificate cert = null;
bool selfSignedCert = false;
if (Encrypted)
{
if (CertFile == null)
{
// Create a new self-signed certificate
selfSignedCert = true;
cert =
new X509Certificate2Builder
{
SubjectName = string.Format("CN={0}", ((IPEndPoint)listener.LocalEndpoint).Address.ToString())
}.Build();
}
else
{
cert = X509Certificate.CreateFromCertFile(CertFile);
selfSignedCert = false;
}
}
// keep accepting new clients
while (true)
{
// wait and accept new client
// note: 'using' sucks here because it will try to
// dispose after thread was started but we still need it
// in the thread
TcpClient client = listener.AcceptTcpClient();
// set socket options
client.NoDelay = NoDelay;
client.SendTimeout = SendTimeout;
// generate the next connection id (thread safely)
int connectionId = NextConnectionId();
// add to dict immediately
ConnectionState connection = new ConnectionState(client, MaxMessageSize);
clients[connectionId] = connection;
Stream stream = client.GetStream();
Thread sslAuthenticator = null;
if (Encrypted)
{
RemoteCertificateValidationCallback trustCert = (object sender, X509Certificate x509Certificate,
X509Chain x509Chain, SslPolicyErrors policyErrors) =>
{
if (selfSignedCert)
{
// All certificates are accepted
return true;
}
else
{
if (policyErrors == SslPolicyErrors.None)
{
return true;
}
else
{
return false;
}
}
};
SslStream sslStream = new SslStream(client.GetStream(), false, trustCert);
stream = sslStream;
sslAuthenticator = new Thread(() => {
try
{
// Using System.Security.Authentication.SslProtocols.None (the Microsoft recommended parameter which
// chooses the highest version of TLS) does not seem to work with Unity. Unity 2018.2 added support
// for TLS 1.2 when used with the .NET 4.x runtime, so use preprocessor directives to choose the right protocol
#if UNITY_2018_2_OR_NEWER && NET_4_6
System.Security.Authentication.SslProtocols protocol = System.Security.Authentication.SslProtocols.Tls12;
#else
System.Security.Authentication.SslProtocols protocol = System.Security.Authentication.SslProtocols.Default;
#endif
bool checkCertificateRevocation = !selfSignedCert;
sslStream.AuthenticateAsServer(cert, false, protocol, checkCertificateRevocation);
}
catch (Exception exception)
{
Logger.LogError("SSL Authenticator exception: " + exception);
}
});
sslAuthenticator.IsBackground = true;
sslAuthenticator.Start();
}
// spawn a send thread for each client
Thread sendThread = new Thread(() =>
{
// wrap in try-catch, otherwise Thread exceptions
// are silent
try
{
if (sslAuthenticator != null)
{
sslAuthenticator.Join();
}
// run the send loop
// IMPORTANT: DO NOT SHARE STATE ACROSS MULTIPLE THREADS!
ThreadFunctions.SendLoop(connectionId, client, connection.sendPipe, connection.sendPending);
}
catch (ThreadAbortException)
{
// happens on stop. don't log anything.
// (we catch it in SendLoop too, but it still gets
// through to here when aborting. don't show an
// error.)
}
catch (Exception exception)
{
Log.Error("Server send thread exception: " + exception);
}
});
sendThread.IsBackground = true;
sendThread.Start();
// spawn a receive thread for each client
Thread receiveThread = new Thread(() =>
{
// wrap in try-catch, otherwise Thread exceptions
// are silent
try
{
if (sslAuthenticator != null)
{
sslAuthenticator.Join();
}
// run the receive loop
// IMPORTANT: DO NOT SHARE STATE ACROSS MULTIPLE THREADS!
ThreadFunctions.ReceiveLoop(connectionId, client, MaxMessageSize, connection.receivePipe, QueueLimit);
// IMPORTANT: do NOT remove from clients after the
// thread ends. need to do it in Tick() so that the
// disconnect event in the pipe is still processed.
// (removing client immediately would mean that the
// pipe is lost and the disconnect event is never
// processed)
// sendthread might be waiting on ManualResetEvent,
// so let's make sure to end it if the connection
// closed.
// otherwise the send thread would only end if it's
// actually sending data while the connection is
// closed.
sendThread.Interrupt();
}
catch (Exception exception)
{
Log.Error("Server client thread exception: " + exception);
}
});
receiveThread.IsBackground = true;
receiveThread.Start();
}
}
catch (ThreadAbortException exception)
{
// UnityEditor causes AbortException if thread is still
// running when we press Play again next time. that's okay.
Log.Info("Server thread aborted. That's okay. " + exception);
}
catch (SocketException exception)
{
// calling StopServer will interrupt this thread with a
// 'SocketException: interrupted'. that's okay.
Log.Info("Server Thread stopped. That's okay. " + exception);
}
catch (Exception exception)
{
// something went wrong. probably important.
Log.Error("Server Exception: " + exception);
}
}