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New list stores are created with gtk_list_store_new() This function accepts the number of columns and the type of the data each column will hold In Listing 8-1, the list store has three columns that store gboolean, integer, and string data types GtkListStore* gtk_list_store_new (gint n_columns, /* List of column types */); After creating the list store, you need to add rows with gtk_list_store_append() for it to be of any use This function will append a new row to the list store, and the iterator will be set to point to the new row You will learn more about tree iterators in a later section of this chapter For now, it is adequate for you to know that it points to the new tree view row void gtk_list_store_append (GtkListStore *store, GtkTreeIter *iter); There are multiple other functions for adding rows to a list store including gtk_list_ store_prepend() and gtk_list_store_insert().

We know from the last section that we need to initialize dependencies on application startup. For Ninject, we accomplish that in what s known as a module. Create a class called MyNinjectModule and edit it to look like listing 13.8.

A full list of available functions can be found in the GtkListStore API documentation In addition to adding rows, you can also remove them with gtk_list_store_remove() This function will remove the row that GtkTreeIter refers to After the row is removed, the iterator will point to the next row in the list store, and the function will return TRUE If the last row was just removed, the iterator will become invalid, and the function will return FALSE gboolean gtk_list_store_remove (GtkListStore *store, GtkTreeIter *iter); In addition, gtk_list_store_clear() is provided, which can be used to remove all rows from a list store You will be left with a GtkListStore that contains no data If the object will not be used beyond this point, it should then be unreferenced Now that you have a row, you need to add data to it with gtk_list_store_set().

Some databases have dangerous functionality that is enabled by default. For example, a version of Microsoft SQL Server provides SQL commands that allows users to open inbound and outbound network connections. Cesar Cerrudo s Manipulating Microsoft SQL Server Using SQL Injection shows how such functionality can be used by an attacker to copy data to an attacker s database server, upload arbitrary binaries to the victim system for execution, port scan the victim s internal network, and much, much more. To prevent an attacker from having a field day with any extra functionality provided by your database, you should clearly review your database configuration and disable all such functionality by default. In addition, hardening guidelines for the operating system that the database is running on should be followed; for instance, unused services and accounts should be disabled (there is usually no need for a web server to be running on the database host).

public class MyNinjectModule : NinjectModule { public override void Load() { Bind<IMessageProvider>() .To<NinjectMessageProvider>(); } }

The gtk_list_store_set() function receives a list of pairs of column numbers and value parameters For example, the first column in the following function call, referenced with BUY_IT, accepts a Boolean value that defines whether the product should be purchased These values correspond to those set by gtk_list_store_new() gtk_list_store_set (store, &iter, BUY_IT, list[i]buy, QUANTITY, list[i]quantity, PRODUCT, list[i]product, -1); The last element of gtk_list_store_set() must be set to -1 so that GTK+ knows that there are no more parameters Otherwise, your users will be presented with an endless list of warnings and errors in the terminal output..

Like the StructureMap registry, a Ninject module gives you the ability to wire a particular implementation to its concrete implementation.

GtkCellRendererText automatically converts Boolean values and numbers into text strings that can be rendered on the screen. Therefore, the type of data applied to a text attribute column does not have to be text itself, but just has to be consistent with the list store column type that was defined during initialization of the GtkListStore.

The prevention strategies for SQL injection introduced in this chapter focus on validating or escaping data before it is used in an SQL query. In addition to this SQL-specific validation or escaping, you should not ignore validation of data at the time it actually enters your system. Following the best practice of constraining all input variables (e.g., query parameters in an HTTP request) as early as possible in your code may well save you from being vulnerable in case a programmer forgot to escape a particular variable that is used in an SQL query. Also, rejecting unreasonably long inputs may prevent an attacker from exploiting a buffer overflow in the SQL parser that you weren t aware of and have not applied patches for. Applying validation both at the entry points to your code and before a query means that you may have to do the work twice. However, this small inefficiency is usually well worth the additional safety margin.

We haven t created our NinjectMessageProvider yet, so let s do that now. In your Models folder, create a new class called NinjectMessageProvider. It has to implement the IMessageProvider interface, so make it look like listing 13.9.