АBOBOАвй(dHHHHHHавй4џџHвйИР$ џџвйDџ-ZџџџPerry The CynicˆfџџBLOM!`сoDџxHHи(џсџтљFG(ќHHи(d'`џџеР Іl@/РhыDвй<еР еЦ\2ыhеХгъФ ваМ[фџџџџџџџџ†€}DSETrџ“UUваРвй вк ваФваДдˆеПМ+lеРl fдˆеЦd% @№Œ"Ѓ<і'9Ч›tŒO ” v ‘ Г š ЖУœ,œхœrœё FX‡ІUќŽ"Є<  '9 ‘‡ ’‘ ‘У ’а ‘Ь ’ж ‘л ’ш ‘ ’' ‘tŒ ‘™ ’Ѓ ‘М ’Ц ‘Я ’й ‘) ’6 ‘œ ’І ‘ ’ ‘  ’ ! ‘ Ж ’ М ‘ v ‘ ‘ ч ’ є ‘ c ’ r ‘ ~ › ˆ ‘  Ј ’ ‘ к ™ л ‘ Џ ™ А ‘ > ’ K ‘ š Ж ‘ Р › Ъ ‘У , ž5 7 ž? A žJ  Џ’ ­™ Ў ЎЛ § ž u ž€  ‘8 ’G ‘P ›Z ‘ё ‘Є ’Б ‘э ’њ ™ћ ‘FX  ‡ ЇU ‘` кˆд Џzд2њˆдF ваШ њваЬеР„еРh 5еРŒOdеРˆГЃваА How to Write a CSSM Plugin in C++ (Plugins for Lazy People) Since CSSM supports the full CDSA/SPI interfaces, you may write a CSSM plugin module in any language, and give it the officially supported C interfaces to вhook upг with CSSM. This can be exceedingly tedious, since you not only have to write reams of glue code, but you also have to access memory allocators and utility functions via interestingly defined callback functions to CSSM. But by all means, if you crave the experience, go for it. Lazy people, on the other hand, will want њto avoid such interesting work by using the C++ interface layer available for your pleasure. This SPI transition layer takes care of communication with CSSM and the associated nastiness, and presents you with a fairly clean C++ based вbedг to lay your code into. How Does It Work? The SPI glue defines two C++ classes that together model a plugin module. The CssmPlugin class represents a plugin module as a whole. The PluginSession class represents one particular attachment of your module, the result of a successful CSSM_ModuleAttach to your module. At any given time, there is only one CssmPlugin object for your module, but there can be any number of PluginSession objects. Both CssmPlugin and PluginSession are abstract classes. You must create a subclass of CssmPlugin to represent your module, and a subclass of PluginSession for each module type your module supports. General Rules You are writing C++ code. Except from within destructors, you may throw an exception at any time and the SPI glue will catch it (unless you do so) and transform it into an error return code to be passed back to CSSM. Implementing Cssmplugin To implement CssmPlugin, you must implement the makePlugin method. MakePlugin is called when CSSM wants to attach your module. You must create a subclass of PluginSession, presumably one of yours (see below). Note that your module can be attached any number of times. the CssmPlugin class will keep track of these attachments for you. If you are writing a multifunction module, use the subserviceType argument to decide which type is being requested. If your plugin object needs some initialization, do it in the constructor (and destructor, as needed). If you want to perform some action while your module is actually being вloadedг by CSSM, implement the load method. These are distinct times; a CssmPlugin object may be constructed but not (yet) loaded for a little while. Conversely, you can implement the unload method to gain control while the module is unloading. You can actually refuse to unload by throwing an exception from the unload method. Do not throw an exception from your destructor. Implementing PluginSession To represent an individual plugin session (attachment), you must create a subclass of PluginSession. Unless you are implementing an EMM (new module type), your session class should actually be derived from the XXPluginSession defined in XXplugin.h, where XX is the type code of the type of module attachment you wish to implement. This class already defines a virtual method for each SPI func5tion provided by that plugin type. The SPI glue takes care of calling these methods when appropriate; it remains for you to implement them as desired . You must implement all SPI methods of your parent class. If you choose not to provide a particular SPI function, implement it and call the unimplemented method in its body. This will throw the вfunction not implementedг exception. Implementing Your Functions Check the XXplugin.h header file for the exact argument profile of each implementation function. These profiles are automatically generated from the corresponding SPI header file (cssmXXi.h), but they are not identical to them. Here is a brief summary of what is done: All non-optional pointer arguments are turned into references. The argument is guaranteed to be present. CSSM_DATA, CSSM_KEY, CSSM_GUID, andd many other data types are transformed into their corresponding PodWrapper C++ types. (See the C++ Utilities document for PodWrappers and their use.) Functions that return a CSSM_HANDLE of some kind through a pointer-to-handle output argument instead return the handle as a function result. No CSSM_RETURN result is returned. Instead, the function is assumed to succeed if it returns normally, and to fail if it throws an exception. It probably easiest to just copy the functions from the XXPluginSession type in XXplugin.h and modify them appropriately. The definitions should not change unless the CDSA standard itself changes, or we find some bug that requires a change. Memory Management You may allocate memory from the usual sources as you wish. Remember that you can run out of memory, and that a badalloc exception will be thrown if you do. The PluginSession oЃbject, of which your session objects are subclasses, is a CssmAllocator. If you use your session object for allocating memory, it will be taken from the applicationеs memory pool via the application memory allocators specified by the user when your module was attached. Please remember that you can be attached any number of times, and that each session has its own, potentially different, allocator. Where Do I Start? The Insight tree contains a sample plugin called вfakeplugг in the Tests directory. It doesnеt do anything particularly useful, but you can copy the whole directory and start editing from there. In any case, it is probably wise to examine the fakeplug code for a working example of plugin construction. NOTE: If you copy fakeplug to start your own project, please remember not to copy the CVS subdirectory. Otherwise your changes will go right back into the fakeplug project а probably not what you intended. ZџџNд DSETT#%`€&еРpвааеРtдвк@• — – 'еРx' XX is one of AC, CL, CSP, DL, or TP.DSETTp‡`€O еПРеϘеЦ€д2еЦh2Љx Ћ Њ  Ќ Њ? ЌL ЊQ Ќh Њp Ќ‡ Њ PеПјP Actually, XXPluginSession is a class that inherits from both PluginSession and XXAbstractPluginSession, where XXAbstractPluginSession contains all the pure virtual methods. 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