Beispiel #1
0
        /// <summary>
        /// Runs on a new client connection, and sets a client id and adds to list of clients.
        /// </summary>
        /// <param name="asyncResult">Result from connection containing socket to client</param>
        public static void ClientConnectCallback(IAsyncResult asyncResult)
        {
            try
            {
                Socket clientSocket = Globals.Listener.EndAccept(asyncResult);

                NetworkStream networkStream = new NetworkStream(clientSocket);
                SslStream     sslStream     = new SslStream(networkStream, false);


                // Authenticate the server but don't require the client to authenticate.
                try
                {
                    sslStream.AuthenticateAsServer(Globals.ServerCertificate, false,
                                                   true);

                    // Display the properties and settings for the authenticated stream.
                    HelperMethods.DisplaySecurityLevel(sslStream);
                    HelperMethods.DisplaySecurityServices(sslStream);
                    HelperMethods.DisplayCertificateInformation(sslStream);
                    HelperMethods.DisplayStreamProperties(sslStream);

                    // Set timeouts to 5 seconds.
                    sslStream.ReadTimeout  = 5000;
                    sslStream.WriteTimeout = 5000;
                }
                catch (AuthenticationException e)
                {
                    Console.WriteLine($"Exception: {e.Message}");
                    if (e.InnerException != null)
                    {
                        Console.WriteLine($"Inner exception: {e.InnerException.Message}");
                    }

                    Console.WriteLine("Authentication failed - closing the connection.");
                    sslStream.Close();
                    clientSocket.Close();
                    Globals.Listener.BeginAccept(ClientConnectCallback, null);// keep listening
                    return;
                }
                catch (Exception e)
                {
                    Console.WriteLine($"Exception: {e.Message}");
                    sslStream.Close();
                    clientSocket.Close();
                    Globals.Listener.BeginAccept(ClientConnectCallback, null);// keep listening
                    return;
                }


                byte[] clientId = new byte[10];
                Globals.Random.NextBytes(clientId);
                string idString = clientId.Aggregate("", (current, idByte) => current + idByte);

                // Keep trying until we get a username that isn't taken
                while (HelperMethods.UsernameTaken(idString))
                {
                    Globals.Random.NextBytes(clientId);
                    idString = clientId.Aggregate("", (current, idByte) => current + idByte);
                }

                ClientInfo newClient = new ClientInfo(clientSocket, sslStream, networkStream);
                newClient.SetUsername(idString);// Set the default username to the randomly generated byte id

                Globals.ClientList.Add(newClient);
                Console.WriteLine($"Client {newClient.GetUsername()} connected");
                newClient.BeginReceiveData();

                Globals.Listener.BeginAccept(ClientConnectCallback, null);
            }
            catch (ObjectDisposedException)
            {
                Console.WriteLine("ClientConnectCallback(): Object already disposed");
            }
            catch (SocketException se)
            {
                Console.WriteLine(se.Message);
            }
        }