100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
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/*++
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Copyright (c) 2002 Microsoft Corporation
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Module Name:
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ImageCast.cpp
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Abstract:
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This app tries placing its license DLL 'LicDLL.DLL' in the
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%windir%\system32 folder. This was ok on Win2K as there was no duplicate
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file in sytem32 but on XP, we have the OS license DLL with the same name.
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So, the app cannot place it's dll in the system32 directory as it is
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protected.
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During registration, the app loads the system registration DLL 'LicDLL.DLL'
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and tries to get a proc address that does not obviously exist in the system
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DLL and the call fails. So, the app displays all greyed out options.
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The solution is to redirect the app's DLL to some other folder and pick it
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up from there. This Shim picks up the LicDLL.DLL that was redirected to
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%windir% folder.
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Notes:
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This is an app specific shim.
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History:
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01/23/2002 prashkud Created
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02/27/2002 robkenny Security review.
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(ImageCast)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(LoadLibraryA)
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APIHOOK_ENUM_END
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/*++
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Hooks LoadLibraryA and redirects if the filename is 'LicDLL.DLL' to
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%windir%\LicDLL.DLL. The file 'LicDLL.DLL' would be redirected during
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the setup to %windir%\system.
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--*/
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HMODULE
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APIHOOK(LoadLibraryA)(
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LPCSTR lpFileName
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)
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{
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CSTRING_TRY
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{
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// Bad string pointers can cause failures in CString.
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if (!IsBadStringPtrA(lpFileName, MAX_PATH))
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{
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//
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// We have found 'LicDLL.dll' in the path. Replace with "%windir%\LicDLL.DLL"
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//
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CString csFileName(lpFileName);
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if (csFileName == L"LicDLL.DLL")
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{
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CString csNewFileName;
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csNewFileName.GetWindowsDirectoryW();
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csNewFileName.AppendPath(csFileName);
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LOGN(eDbgLevelInfo, "[ImageCast] changed %s to (%s)", lpFileName, csNewFileName.GetAnsi());
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return ORIGINAL_API(LoadLibraryA)(csNewFileName.GetAnsi());
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}
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}
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}
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CSTRING_CATCH
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{
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}
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return ORIGINAL_API(LoadLibraryA)(lpFileName);
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(KERNEL32.DLL, LoadLibraryA)
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HOOK_END
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IMPLEMENT_SHIM_END
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