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So to invoke any method, a client must use the corresponding pointer to perform a call. Every COM class starts with a pointer to vtable with no exceptions. Every pointer is a pointer to class methods, taking into account the order of declaration. The virtual method table (also referred to as vtable) is basically a pointer array, which performs calls of COM interface methods. Not only that, there is also room for changes, which allows implementing a custom replacement for the server. This saves us from the process of recompiling clients in case the corresponding COM server changes, but the server must still provide the same interfaces after it was modified. Thanks to this, COM objects gain independence on the binary level. Interface pointers are used by clients to perform calls for methods of a COM object. An interface can be uniquely identified by its IID (an interface ID, which is globally unique). Its functions are to count references and to get pointers to interfaces, which other objects implement. These interfaces have a common limitation: they must originate from IUnknown. This section will introduce you to the basics, so if this is what you already know, you can jump to the practical section, as this introductory section will have nothing new to teach you.ĬOM classes are designed to support the implementation of several interfaces. In general, to hook COM interface methods we need to intercept calls to COM objects, but before we commence to this task, it would be useful to discuss some basic principles of the COM technology.
#INTERFACE DETOURS WINDOWS#
More information about the API hooking process is available in the Windows API Hooking post.Ĥ.
#INTERFACE DETOURS CODE#
To make the process described here easier to follow, we have tried to make the code examples given here simple in order to focus on what is relevant for our task. Each approach will be considered in details we will consider the upsides and downsides of each of them. The process of COM object hooking has two major approaches. However COM technology has its own specifics, so the two processes differ in some aspects. If you are acquainted with user-mode API hooks, it will be apparent to you that the process of API hooking shares some features with hooking COM objects (not only in methods used, but also in their purpose). Here you’ll find: theory, functional code samples, and clear explanations. The current article was written to help you get familiar with the procedure of implementing COM interface hooking.
#INTERFACE DETOURS UPDATE#
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