| /* |
| * Copyright (C) 2010 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "Module.h" |
| |
| #include <WebCore/DelayLoadedModulesEnumerator.h> |
| #include <WebCore/ImportedFunctionsEnumerator.h> |
| #include <WebCore/ImportedModulesEnumerator.h> |
| #include <shlwapi.h> |
| |
| using namespace WebCore; |
| |
| namespace WebKit { |
| |
| bool Module::load() |
| { |
| ASSERT(!::PathIsRelativeW(m_path.charactersWithNullTermination())); |
| m_module = ::LoadLibraryExW(m_path.charactersWithNullTermination(), 0, LOAD_WITH_ALTERED_SEARCH_PATH); |
| return m_module; |
| } |
| |
| void Module::unload() |
| { |
| if (!m_module) |
| return; |
| ::FreeLibrary(m_module); |
| m_module = 0; |
| } |
| |
| static void memcpyToReadOnlyMemory(void* destination, const void* source, size_t size) |
| { |
| DWORD originalProtection; |
| if (!::VirtualProtect(destination, size, PAGE_READWRITE, &originalProtection)) |
| return; |
| |
| memcpy(destination, source, size); |
| |
| ::VirtualProtect(destination, size, originalProtection, &originalProtection); |
| } |
| |
| static const void* const* findFunctionPointerAddress(ImportedModulesEnumeratorBase& modules, const char* importDLLName, const char* importFunctionName) |
| { |
| for (; !modules.isAtEnd(); modules.next()) { |
| if (_stricmp(importDLLName, modules.currentModuleName())) |
| continue; |
| |
| for (ImportedFunctionsEnumerator functions = modules.functionsEnumerator(); !functions.isAtEnd(); functions.next()) { |
| const char* currentFunctionName = functions.currentFunctionName(); |
| if (!currentFunctionName || strcmp(importFunctionName, currentFunctionName)) |
| continue; |
| |
| return functions.addressOfCurrentFunctionPointer(); |
| } |
| |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static const void* const* findFunctionPointerAddress(HMODULE module, const char* importDLLName, const char* importFunctionName) |
| { |
| PEImage image(module); |
| |
| ImportedModulesEnumerator importedModules(image); |
| if (const void* const* functionPointerAddress = findFunctionPointerAddress(importedModules, importDLLName, importFunctionName)) |
| return functionPointerAddress; |
| |
| DelayLoadedModulesEnumerator delayLoadedModules(image); |
| return findFunctionPointerAddress(delayLoadedModules, importDLLName, importFunctionName); |
| } |
| |
| void Module::installIATHook(const char* importDLLName, const char* importFunctionName, const void* hookFunction) |
| { |
| if (!m_module) |
| return; |
| |
| // The Import Address Table (IAT) contains one function pointer for each function imported by |
| // this module. When code in this module calls that function, the function pointer from the IAT |
| // is used. We find that function pointer and overwrite it with hookFunction so that |
| // hookFunction will be called instead. |
| |
| const void* const* functionPointerAddress = findFunctionPointerAddress(m_module, importDLLName, importFunctionName); |
| if (!functionPointerAddress || *functionPointerAddress == hookFunction) |
| return; |
| |
| memcpyToReadOnlyMemory(const_cast<const void**>(functionPointerAddress), &hookFunction, sizeof(hookFunction)); |
| } |
| |
| void* Module::platformFunctionPointer(const char* functionName) const |
| { |
| if (!m_module) |
| return 0; |
| |
| return ::GetProcAddress(m_module, functionName); |
| } |
| |
| } // namespace WebKit |