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When you want to build support of plugins designed for other applications or earlier non Qt-based versions of your application, it is important to know how to handle plugins at a lower level. This section shows you how it s done and how Qt can be used to access plugins that were designed for other applications or by using other tools.

At its heart Routes is all about two things: analyzing a URL to produce a list of variables and being able to re-generate that URL from the same variables. These variables are known as routing variables, and they are used by Pylons to determine which controller action should be called and the arguments it should be called with. The URL matching is done by comparing the URL to a series of strings known as route paths, which, together with a set of options, define how a particular set of URLs can be turned into routing variables and back to URLs again. The route paths and options together are known as a route, and a set of routes is known as a route map. Let s see how these concepts are applied in a Pylons application. You can find your project s route map in its config/routing.py file. Let s use the SimpleSite route map as an example. It looks like this: def make_map(): """Create, configure and return the routes Mapper""" map = Mapper(directory=config['pylons.paths']['controllers'], always_scan=config['debug']) map.minimization = False # The ErrorController route (handles 404/500 error pages); it should # likely stay at the top, ensuring it can always be resolved map.connect('/error/{action}', controller='error') map.connect('/error/{action}/{id}', controller='error') # CUSTOM ROUTES HERE map.connect('/{controller}/{action}') map.connect('/{controller}/{action}/{id}') return map Here you can see that the make_map() function is responsible for creating a route map object called map and returning it. The routes are added to the map via the map.connect() function, which takes a route path such as '/{controller}/{action}/{id}' and some optional arguments called the route options. Each of the labels for the dynamic parts between the { and } characters specify the positions of routing variables that are matched against any value in the corresponding position

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A variation of the attack in the previous section is possible if the attribute s value is not enclosed in quotes in the template Consider a template fragment in which the attribute s value is not enclosed in quotes, for example <img src=%(image_url)s> Suppose the attacker is able to cause the variable image_url to contain http://wwwexamplesiteorg/ onerror=evil-script; After substitution, this will result in the HTML fragment <img src=http://wwwexamplesiteorg/ onerror=evil-script;> Browsers are usually lenient in their parsing of HTML attributes, and assume that an attribute whose value is not enclosed in quotes ends at the first whitespace character or the end of the tag Thus, the preceding HTML will be parsed as an <img> tag with two attributes (ie, the attacker was able to inject an additional attribute) The ability to inject an arbitrary attribute can often be exploited to execute arbitrary script.

Figure 11-7. A Qt image format plugin seen from the Dependency Walker Let s have a look at the source code of the trivial library that you ll interface. Listing 11-35 shows the implementation of the sum function. All the function does is calculate a checksum for a given data stream. Listing 11-35. The sum function in all its glory int sum( int len, char *data ) { int i; int sum = 0x5a; for( i=0; i<len; ++i ) sum ^= data[i]; return sum; } On the Windows platform I used the custom Makefile shown in Listing 11-36 to build a DLL. If you use another platform, you should change the file extension of the resulting file (sum.dll in the file shown in the listing). On Unix the extension usually is .so, and on Mac OS

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