/// <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);
}
}