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The first and best method for ensuring you do not fall into the buffer overflow trap is proper bounds checking. This seems at first to be relatively simple, until you consider the number of library functions you use throughout your code without considering their behavior in out-of-bounds conditions. The most

Single Item Purchases is a PayPal feature that allows you to send the visitor directly to a payment page instead of the PayPal shopping cart. The PayPal shopping cart will become useless in 8, where you ll create your own shopping cart. In 9, you ll implement the Place Order button in the shopping cart, which saves the order into the database and forwards to a PayPal payment page. To call the PayPal payment page (bypassing the PayPal shopping cart), you redirect to a link like the following: https://www.paypal.com/xclick/business=youremail@example.com&item_name=Order 123 &item_number=123&amount=123¤cy=USD&return=www.example.com &cancel_return=www.example.com Review the PayPal Website Payments Standard Integration Guide for more details about the service.

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common area for these functions to show up is in string handling, including functions such as gets(), sprintf(), vsprintf(), strcpy(), and so on. None of these functions has an argument to specify the size of the buffer they are operating on. As such, consider the following code:

char buffer[10]; strcpy(buffer,"This is much longer than 10 bytes");

When you implement the PayPal Single Item Purchases in 9, you ll use code that looks like the following code snippet to create the URL of the PayPal Single Item Purchases page: // Calculate the total amount for the shopping cart $this->mTotalAmount = ShoppingCart::GetTotalAmount();

Although buffer is only 10 bytes in size, the strcpy() function will continue to write data into buffer[11], buffer[12], and so on. While this example may only cause our code to crash when run, it is not all that different from the method many network servers use to copy strings sent by a client into a buffer. This opens the door for the client to overflow the buffer, overwrite the stack, and gain control of the server. The solution to this is to use the strncpy() function instead. The function, defined as

// If the Place Order button was clicked ... if(isset ($_POST['place_order'])) { // Create the order and get the order ID $order_id = ShoppingCart::CreateOrder(); // This will contain the PayPal link $redirect = 'https://www.paypal.com/xclick/business=youremail@example.com' . '&item_name=HatShop Order ' . $order_id . '&item_number=' . $order_id . '&amount=' . $this->mTotalAmount . '¤cy=USD&return=www.example.com' . '&cancel_return=www.example.com'; // Redirection to the payment page header('Location: ' . $redirect); exit; } You ll learn how to work with this feature in 9.

3. Double-click the line containing the build error in the Error List window. The corresponding code will become visible in the code editor. 4. Uncomment the line you commented in step 1 by deleting the single quote. Select Build Build Solution. This time, the Output window is displayed at the bottom of the screen, indicating that there were no build errors. 5. Save the project and exit VS.

char *strncpy(char *dest, const char *src, size_t n);

Summary

allows us to specify the maximum size in bytes that should be copied. If the maximum is reached before a NULL character is found in the src string, then copying stops and the call returns.

NOTE When using strncpy(), if a NULL character is not encountered, the destination buffer may not be null terminated, which can cause problems if you use other string functions later. You should always leave an extra byte at the end of the buffer to be set to NULL to prevent these problems from arising.

In this chapter, you saw how to integrate PayPal into an e-commerce site a simple payment solution that many small businesses choose so they don t have to process credit card or payment information themselves. First, we listed some of the alternatives to PayPal, before guiding you through the creation of a new PayPal account. We then covered how to integrate PayPal in stages 1 and 2 of development, first discussing a shopping cart, a custom checkout mechanism, and then how to direct the visitor directly to the payment page. In the next chapter, we will move on to look at a catalog administration page for HatShop.

Other string handling functions also have alternatives that let you specify a boundary condition in bytes. Table 12-1 shows some of the common functions and their safer alternatives.

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