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If you are working on a UNIX-like machine, you can use the pipe() function to create new file descriptors. In Listing 6-9, two pairs of pipes are set up: one for sending messages from the parent to the child and one for sending messages in the other direction. Two GIOChannels can then be created from these file descriptors by calling the following function on each. After the pipes are created, the application is forked with fork(). If the fork is successful, the application is set up for both the child and the parent process. Within setup_app(), we begin by closing the pipes that are not needed by the child or parent applications with close(). Each process will only need one read and one write pipe in order to send and receive messages. Next, we use the two remaining pipes in each application and set up a GIOChannel for each. We will use channel_read to receive data from the other process and channel_write to send the new content of the GtkEntry. channel_read = g_io_channel_unix_new (input[0]); channel_write = g_io_channel_unix_new (output[1]); After initializing your IO channels, you need to set up a watch on channel_read. The watch will monitor the channel for the specified events, which is setup with g_io_add_watch(). guint g_io_add_watch (GIOChannel *channel, GIOCondition condition, GIOFunc func, gpointer data);

Figure 15-4. Mutual authentication in SSL If RSA is to be used for key agreement, the client transmits a ClientKeyExchange message to the server, just as in the server-authenticated-only case, but then sends a CertificateVerify message to the server containing the client s signature on all handshake messages, starting from the ClientHello message up to (but not including) the CertificateVerify message. After the appropriate Certificate, ClientKeyExchange, and CertificateVerify messages are sent by the client as needed, the pre-master secret is set. The master secret is then computed from the pre-master secret, and the client and server transmit the ChangeCipherSpec and Finished messages. Both parties can then start exchanging application data encrypted with the master secret. Much thought has gone into the design of SSL, and its mechanisms prevent a large variety of attacks. For instance, a man-in-the-middle may try splicing in and replaying data from previous sessions in an attempt to take over a conversation, or a malicious client may attempt to coerce a server into using weaker encryption algorithms by claiming it does not support

Under the covers, when we install ASP.NET MVC on top of Visual Studio, we get templates for adding items such as areas, views, and controllers. For instance, if we right-click an action, we ll see an option to open the Add View dialog box, shown in figure 25.1. In this dialog box, we can choose the name of the view, the view model type, and the master page. If we select a strongly typed view, we have the option of choosing an automatic view template. The options are Empty, List, Create, Details, and Delete. Figure 25.1 shows us selecting Create for our view content and Product for our view data class.

The second parameter of g_io_add_watch() adds one or more events that should be watched You need to make sure to set up the correct conditions with each channel You will never get a G_IO_IN event from a channel used for writing data, so monitoring for that event is useless Possible values for the GIOCondition enumeration follow; these can be piped to the condition parameter of g_io_add_watch(): G_IO_IN: Read data is pending G_IO_OUT: Data can be written without the worry of blocking G_IO_PRI: Read data is pending and urgent G_IO_ERR: An error has occurred G_IO_HUP: The connection has been hung up or broken G_IO_NVAL: An invalid request has occurred because the file descriptor is not open When one of the specified conditions occurs, the GIOFunc callback function is called The last parameter gives data that will be passed to the callback function.

The options in the View Content drop-down list are T4 templates that are located on a 64-bit system in C:\Program Files (x86)\Microsoft Visual Studio 9.0\Common7\ IDE\ItemTemplates\CSharp\Web\MVC 2\CodeTemplates. If we click Add, we re given a complete form, generated for us by Visual Studio using the default template. Our view now looks like listing 25.1.

newer ones. In addition to defending against such attacks, SSL supports various performance optimizations for example, once a client and server have successfully completed a handshake, they can cache security parameters that they have already negotiated and resume a previous conversation without having to redo a full handshake even if they initiate a new TCP connection. If you require authentication, confidentiality, and/or message integrity between a client and server, you should strongly consider reusing SSL instead of attempting to build a protocol of your own.