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In the same listing you can also see the write slot implementation. Because the slot can be invoked from several threads at once, it protects the m_count counter using a mutex. The slot can be called directly as a function just as well as being invoked by an emitted signal, so you can t forget this just because the signals are being queued and served one by one. Listing 12-29. The write slot and the run method of the TextDevice class void TextDevice::run() { exec(); } void TextDevice::stop() { quit(); } void TextDevice::write( QString text ) { QMutexLocker locker( &m_mutex ); qDebug() << QString( "Call %1: %2" ).arg( m_count++ ).arg( text ); } Putting the TextThread and TextDevice classes to use is simple. Look at Listing 12-30 for an example of a main function setting up two text threads and one device. Because the data is exchanged via signals and slots, the different thread objects don t need to know about each other; they are simply interconnected using two calls to connect. When the connections have been set up, they are started, and a dialog is shown. As soon as the dialog is closed, all three threads are stopped. The function then waits for them to actually halt before the application ends. Listing 12-30. A main function using the TextThread and TextDevice classes int main( int argc, char **argv ) { QApplication app( argc, argv ); TextDevice device; TextThread foo( "Foo" ), bar( "Bar" ); QObject::connect( &foo, SIGNAL(writeText(const QString&)), &device, SLOT(write(const QString&)) ); QObject::connect( &bar, SIGNAL(writeText(const QString&)), &device, SLOT(write(const QString&)) );

The page controller s save() action currently looks like this: @restrict('POST') @validate(schema=NewPageForm(), form='edit') def save(self, id=None): page_q = metaSessionquery(modelPage) page = page_qfilter_by(id=id)first() if page is None: abort(404) for k,v in selfform_resultitems(): if getattr(page, k) != v: setattr(page, k, v) metaSessioncommit() session['flash'] = 'Page successfully updated' sessionsave() # Issue an HTTP redirect responsestatus_int = 302 responseheaders['location'] = hurl_for(controller='page', action='view', id=pageid) return "Moved temporarily" Let s write a test to check that this action behaves in the correct way: GET requests are disallowed by the @restrict decorator The action returns a 404 Not Found response if no ID is specified The action returns a 404 Not Found response for IDs that don t exist Invalid data should result in the form being displayed The action saves the updated data in the database.

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foo.start(); bar.start(); device.start(); QMessageBox::information( 0, "Threading", "Close me to stop!" ); foo.stop(); bar.stop(); device.stop(); foo.wait(); bar.wait(); device.wait(); return 0; } Running this application gives you a result similar to the one shown in Listing 12-10: a list of numbered strings.

Pharming is another attack in which a user can be fooled into entering sensitive data into a spoofed web site. It is different than phishing in that the attacker does not have to rely on the user clicking a link in an e-mail. With pharming, even if the user correctly enters a URL (uniform resource locator) or web address into a browser s address bar, the attacker can still redirect the user to a malicious web site. When a user enters a URL say, www.google.com/index.html the browser needs to first figure out the IP address of the machine to which to connect. It extracts the domain name, www.google.com, from the URL, and sends the domain name to a domain name server (DNS). The DNS is responsible for translating the domain name to an IP address. The browser then connects to the IP address returned by the DNS and issues an HTTP request for index.html. In a pharming attack, an attacker interferes with the machine name to IP address translation for which the DNS is responsible. The attacker can do so by, for instance, compromising the DNS server, and coaxing it into returning the attacker s IP address instead of the legitimate one. If the user is browsing via HTTP, the attack can be unnoticeable to the user. However, if a user connects to a site using SSL, a pharming attack (in most cases) will result in a dialog box from the browser complaining that it was not able to authenticate the server due to a certificate mismatch. (We discuss certificates in Section 15.3.)

The action sets a flash message in the session The action returns a redirect response to redirect to the create action You could write the tests for each of these in a single method of the TestPageController class, but if one of the tests failed for any reason, nose would not continue with the rest of the method On the other hand, some of the tests are dependent on other tests passing, so you cannot write them all as separate methods either For example, you can t test whether a flash message was set if saving the page failed.

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