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namespace Apress.VisualCSharpRecipes.10 { public class Recipe10_11Client { private static void Main() { using (TcpClient client = new TcpClient()) { Console.WriteLine("Attempting to connect to the server ", "on port 8000."); // Connect to the server. client.Connect(IPAddress.Parse("127.0.0.1"), 8000); // Retrieve the network stream from the TcpClient. using (NetworkStream networkStream = client.GetStream()) { // Create a BinaryWriter for writing to the stream. using (BinaryWriter writer = new BinaryWriter(networkStream)) { // Start a dialogue. writer.Write(Recipe10_11Shared.RequestConnect); // Create a BinaryReader for reading from the stream. using (BinaryReader reader = new BinaryReader(networkStream)) { if (reader.ReadString() == Recipe10_11Shared.AcknowledgeOK) { Console.WriteLine("Connection established." + "Press Enter to download data."); Console.ReadLine(); // Send message requesting data to server. writer.Write(Recipe10_11Shared.RequestData); // The server should respond with the size of // the data it will send. Assume it does. int fileSize = int.Parse(reader.ReadString()); // Only get part of the data then carry out a // premature disconnect. for (int i = 0; i < fileSize / 3; i++) { Console.Write(networkStream.ReadByte()); } Console.WriteLine(Environment.NewLine);

return true } catch (AuthenticationException ex){ return false } } static constraints = { login blank:false, validator:{ val, cmd -> if(!cmd.authenticate()) return "user.invalid.login" } password blank:false } } You can see the guts of the logic in the authenticate() method of the LoginCommand in Listing 14-26. Initially, a new UsernamePasswordToken instance is constructed and passed to the jsecSecurityManager bean s login(AuthenticationToken) method. If the login (AuthenticationToken) method completes without an exception being thrown, the authenticate() method returns true, signaling a successful login. Otherwise, if an exception is thrown, false is returned. The other major change to the LoginCommand is that the login constraint now calls the command s authenticate() method and returns a code called user.invalid.login if authentication failed. You could write code to handle specific AuthenticationException instances, such as UnknownAccountException, and return different error codes based on each exception. Nevertheless, the code serves to demonstrate how to use a command object to authenticate via JSecurity. As for the login action of the UserController, it doesn t need any changes since the command object itself encapsulates the logic of logging in. However, what does need a change is the register action. This currently stores passwords in plain-text form, but JSecurity is expecting an SHA1 hash of the password by default. Listing 14-27 shows the changes made to the register action to provide an SHA1 hash of the password. Listing 14-27. Hashing a Password with SHA1 import org.jsecurity.crypto.hash.Sha1Hash class UserController { ... def register = { if(request.method == 'POST') { ... if(u.validate()) { u.password = new Sha1Hash(u.password).toHex() u.save() ...

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Console.WriteLine("Press Enter to disconnect."); Console.ReadLine(); Console.WriteLine("Disconnecting..."); writer.Write(Recipe10_11Shared.Disconnect); } else { Console.WriteLine("Connection not established."); } } } } } // Wait to continue. Console.WriteLine(Environment.NewLine); Console.WriteLine("Connection closed. Press Enter"); Console.ReadLine(); } } }

Figure 11-4. When you use a preferred provider, the e-mail setup process is vastly simplified to entering a few items of information. Tap Other to set up e-mail with another provider. You will see this Add Account screen the first time you run the Mail application if you haven t already set up your accounts.

Use the System.Net.Sockets.UdpClient class, and use two threads: one to send data and the other to receive it.

} ... } } ... }

UDP is a connectionless protocol that doesn t include any flow control or error checking. Unlike TCP , UDP shouldn t be used where reliable communication is required. However, because of its lower overhead, UDP is often used for chatty applications where it is acceptable to lose some messages. For example, imagine you want to create a network in which individual clients send information about the current temperature at their locations to a server every few minutes. You might use UDP in this case because the communication frequency is high and the damage caused by losing a packet is trivial (because the server can just continue to use the last received temperature reading).

Adding the ability to authenticate users wouldn t be of much use if you didn t have the ability to secure areas of a Grails application that require authentication. The JSecurity plugin for Grails uses the filters mechanism discussed earlier in the chapter in order to authenticate users. To begin with, you need to define a filters class. For example, you could create an AuthFilters class, as shown in Figure 14-4.

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