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Another example of an application that could have a security vulnerability is a web browser. Web browsers download and interpret data from web sites on the Internet. Sometimes web browsers do not interpret data in a robust fashion, and can be directed to download data from malicious web sites. A malicious web site can make available a file that exploits a vulnerability in web browser code that can give the attacker control of the machine that the web browser is running on. As a result of poor coding, web browser code needs to be regularly patched to eliminate such vulnerabilities, such as buffer overflows (as discussed in 6). The creators of the web browser can issue patches that can be installed to eliminate the vulnerabilities in the web browser. A patch is an updated version of the software. The patch does not have to consist of an entirely updated version, but may contain only components that have been fixed to eliminate security-related bugs.

Now that you ve seen how to use doctests, you might consider incorporating them into the tests you learned about in the previous chapter. Generally speaking, doctests are more appropriate for testing functions and methods without a large number of dependencies. This makes them great for testing helpers but less suited to testing Pylons controller actions where you would also have to find some way of setting up the Pylons globals as part of the test. For more information on doctests, take a look at the doctest module documentation at http://docs.python.org/library/doctest.html#module-doctest.

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The signals emitted from the QProcess class can be used to monitor the progress or failure of a launched process: error( QProcess::ProcessError error ): The process has experienced some sort of internal error started(): The process has started finished( int code, QProcess::ExitStatus status ): The process has exited readyReadStandardError(): There is data to read from the standard error channel readyReadStandardOutput(): There is data to read from the standard output channel stateChanged( QProcess::ProcessState newState ): The process has entered a new state When there is data ready to read, you can read it using the readAllStandardError method or readAllStandardOutput method, depending on the channel in which you are interested Using the set standardOutputFile and setStandardErrorFile, you can redirect the output from either channel to a file The process state can change between the three states NotRunning, Starting, and Running.

Interactive debugging tools Logging facilities Pylons is no exception and provides tools and methodologies for handling all of these things. You ll learn about each of them during the course of the book.

The attacker can easily cause script to execute if he can manipulate the source of a <script> or <style> tag (as we will discuss in Section 10.5.5, CSS style sheets can cause script to execute). Take the following example: <script src="%(script_url)s"> If the attacker can make script_url point to http://hackerhome.org/evil.js, his malicious script will execute in the context of the page containing this script tag.

When entering NotRunning, you know that the process has ended or will end very soon You can receive finished signals after the state is changed to NotRunning, but error signals generally are emitted before the stateChanged signal Before you can receive any signals at all, you need to start a new process from the runUic slot You can see the slot implementation in Listing 12-41 The nonhighlighted lines disable the user interface and clear the QTextEdit widget used for showing the application output before creating a new QProcess object and setting up the connections The highlighted lines show how to initialize and launch a process First the arguments are assembled in a QStringList object before start is called The start call takes the executable s name and the arguments as parameters After the start method call, it is a matter of waiting for the signals to arrive Listing 12-41.

Python is a fantastic language for a huge range of programming problems. It is easy to learn and yet powerful and expressive enough to handle all manner of tasks. It is also great for web programming (there are good reasons it is one of the three official languages at Google). Perhaps its key benefit is that Python has a great deal of support across all popular platforms including BSD, Linux, Mac OS X, and Windows, as well as a huge range of software libraries already available for it, so the majority of the time you will be able to find a suitable tool for the task you are trying to achieve without having to write it yourself. If you haven t yet learned Python, now would be a good time to read the Python Tutorial at http://docs.python.org/tut/tut.html, which will give you all the knowledge you need to get started developing applications with Pylons. Another good source of information for learning Python is Mark Pilgrim s book Dive Into Python published in 2004. It is freely available online at http://www.diveintopython.org/toc/index.html and goes into a bit more detail about Python.

Furthermore, most browsers interpret URLs with the javascript: scheme such that the remainder of the URL is evaluated as a JavaScript expression, as in the following example: <img src="%(img_url)s"> If the attacker can set img_url to javascript:evil-script;, the resulting HTML will be <img src="javascript:evil-script;"> When the browser attempts to load the image, evil-script; will execute.

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