73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_WIN_IAT_PATCH_FUNCTION_H_
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#define BASE_WIN_IAT_PATCH_FUNCTION_H_
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#include <windows.h>
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#include "base/base_export.h"
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#include "base/basictypes.h"
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namespace base {
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namespace win {
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// A class that encapsulates Import Address Table patching helpers and restores
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// the original function in the destructor.
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//
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// It will intercept functions for a specific DLL imported from another DLL.
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// This is the case when, for example, we want to intercept
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// CertDuplicateCertificateContext function (exported from crypt32.dll) called
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// by wininet.dll.
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class BASE_EXPORT IATPatchFunction {
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public:
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IATPatchFunction();
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~IATPatchFunction();
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// Intercept a function in an import table of a specific
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// module. Save the original function and the import
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// table address. These values will be used later
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// during Unpatch
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//
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// Arguments:
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// module Module to be intercepted
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// imported_from_module Module that exports the 'function_name'
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// function_name Name of the API to be intercepted
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//
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// Returns: Windows error code (winerror.h). NO_ERROR if successful
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//
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// Note: Patching a function will make the IAT patch take some "ownership" on
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// |module|. It will LoadLibrary(module) to keep the DLL alive until a call
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// to Unpatch(), which will call FreeLibrary() and allow the module to be
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// unloaded. The idea is to help prevent the DLL from going away while a
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// patch is still active.
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DWORD Patch(const wchar_t* module,
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const char* imported_from_module,
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const char* function_name,
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void* new_function);
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// Unpatch the IAT entry using internally saved original
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// function.
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//
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// Returns: Windows error code (winerror.h). NO_ERROR if successful
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DWORD Unpatch();
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bool is_patched() const {
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return (NULL != intercept_function_);
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}
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private:
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HMODULE module_handle_;
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void* intercept_function_;
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void* original_function_;
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IMAGE_THUNK_DATA* iat_thunk_;
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DISALLOW_COPY_AND_ASSIGN(IATPatchFunction);
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};
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} // namespace win
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} // namespace base
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#endif // BASE_WIN_IAT_PATCH_FUNCTION_H_
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