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Input validation Input validation is the process of checking whether the user input meets some set of criteria.
Input validation can generally be broken down into two types: string and numeric.
Note that this solution is platform dependent, so it should be used only where portability is not a concern.
Note that this solution treats any trailing characters, including whitespace characters, as an error condition.
It's because this chapter is about one important class of defensive techniques: input validation.
In Recipe 3.3 below on preventing buffer overflows, and in all of the recipes in the book's "Input Validation" chapter, we assume that people are connected to our software, and that some of them may send malicious data (even if we think there is a trusted client on the other end).
The way I thought to solve it was to use a string temp and then check that that was an integer then convert and assign that string to the correct int variable.
Most people are far more worried about active attacks than they are about passive attacks.
Nearly every active attack out there is the result of some kind of input from an attacker.
For example, cryptography and a strong authentication protocol can help prevent attackers from capturing someone's login credentials and sending those credentials as input to the program.
If this entire cookbook focuses primarily on preventing malicious inputs, then why do we have a chapter of recipes specifically devoted to this topic?Data from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators, each of which may be compromised on their own and start sending malformed data.