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false Looking back at main(), if checkPassword() returns a nonzero value (like 1), it calls openVault() If the user does not enter the correct password, then openVault() should not get called The program looks reasonable, but it is vulnerable to a buffer overflow attack Due to the vulnerability, it is possible for an attacker to coerce the program into calling openVault() even without entering the correct password To understand why this can occur, first notice that a buffer of 16 bytes called pass has been allocated in checkPassword() to hold the password that the user enters The gets() function is used to fill that buffer Microprocessors use the concept of an execution stack to keep track of what function they are running at any particular time, and what function they need to return to after finishing the current function.

Listing 10.6 shows an action method that accepts a username and sends a view model to the default view. There are two options for building parameter lists in ASP.NET MVC: we can construct a RouteValueDictionary or an anonymous type, both of which are shown in listing 10.7.

A new calendar is created by clicking the New toolbar button, which will ask for a calendar file name and location. The calendar is saved every time you add or remove an event, so a Save button is not provided. You can also open an existing calendar by pressing the Open toolbar button.

<%=Html.ActionLink("Edit", "Edit", new RouteValueDictionary(new Dictionary<string, object> { {"username", Model.Username } } )) %> <%=Html.ActionLink("Edit", "Edit", new { username = Model.Username }) %>

To open a calendar, this application uses GLib s XML parser to retrieve the content of the file This parser is very easy to use and supports basic XML files The first thing you need to do to use the parser is to define a new GMarkupParser structure This structure contains five functions, which I will cover one at a time Any of these functions can be set to NULL except error() The first function, start_element() is called for every open tag such as <calendar> and <event> This function receives the name of the tag element along with arrays of attribute names and values This allows you to differentiate between starting elements, checking for attributes when appropriate In the calendar application, this function is used to free all of the temporary data stored for the previous event, creating a clean slate for the next event.

The execution stack helps the microprocessor remember where it left off when one function calls another The way that a normal execution stack for the program would look is illustrated by the box labeled Normal Stack in Figure 6-13 After the program is loaded in memory, control is transferred to the main() function Then, main() calls checkPassword() and puts the variables used in the checkPassword() function on top of the stack, as part of a stack frame A stack frame holds variables and other data that might be used by a function In the case of checkPassword(), its stack frame contains the local variable pass, followed by the return address of the main() function (denoted by main in the figure) Once the microprocessor finishes executing checkPassword(), it uses the return address to determine where to continue execution of the program.

The first option, using the RouteValueDictionary, is quite ugly. It takes dozens of characters before you find that you re trying to specify the username option. The second option is shorter but much less intuitive. The signature of that ActionLink overload accepts a parameter named routeValues but only of type object. It s up to the developer to determine when these overloads accepting object parameters are workarounds for the lack of decent dictionary initializer syntax in C#.

void (*start_element) (GMarkupParseContext *context, const gchar *element_name, const gchar **attribute_names, const gchar **attribute_values, gpointer data, GError **error); The next function, end_element(), is called for every close tag such as </calendar> and </event> It is also called for tags that have no close tag such as <tag/> Similar to the previous function, it accepts the tag name In the calendar application, it is used to add the event to the global tree if the </event> tag has been reached void (*end_element) (GMarkupParseContext *context, const gchar *element_name, gpointer data, GError **error); The text() function is called for the data found between start_element() and end_element() calls It accepts the text between the two tags as well as the length of the text You should note that the text string is not NULL-terminated! This function is called in the calendar application to read the content of an event.