185 lines
3.7 KiB
C++
185 lines
3.7 KiB
C++
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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DelayWin95VersionLie.cpp
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Abstract:
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This DLL hooks GetVersion and GetVersionEx so that they return Windows 95
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version credentials. Applications often check to ensure that they are
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running on a Win9x system, even though they will run OK on an NT based
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system.
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Notes:
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This is a general purpose shim.
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History:
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11/10/1999 v-johnwh Created
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--*/
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#include "precomp.h"
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#include "LegalStr.h"
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IMPLEMENT_SHIM_BEGIN(DelayWin95VersionLie)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(GetVersion)
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APIHOOK_ENUM_ENTRY(GetVersionExA)
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APIHOOK_ENUM_ENTRY(GetVersionExW)
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APIHOOK_ENUM_END
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//
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// Used to delay version lying
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//
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DWORD g_dwCount = 0;
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DWORD g_dwDelay = 0;
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/*++
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This stub function fixes up the OSVERSIONINFO structure that is
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returned to the caller with Windows 95 credentials.
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--*/
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BOOL
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APIHOOK(GetVersionExA)(
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OUT LPOSVERSIONINFOA lpVersionInformation
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)
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{
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g_dwCount++;
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if (g_dwCount < g_dwDelay) {
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return ORIGINAL_API(GetVersionExA)(lpVersionInformation);
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} else {
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BOOL bReturn = FALSE;
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if (ORIGINAL_API(GetVersionExA)(lpVersionInformation)) {
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LOGN(eDbgLevelInfo, "[GetVersionExA] Return Win95");
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//
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// Fixup the structure with the Win95 data.
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//
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lpVersionInformation->dwMajorVersion = 4;
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lpVersionInformation->dwMinorVersion = 0;
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lpVersionInformation->dwBuildNumber = 950;
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lpVersionInformation->dwPlatformId = 1;
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*lpVersionInformation->szCSDVersion = '\0';
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bReturn = TRUE;
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}
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return bReturn;
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}
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}
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/*++
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This stub function fixes up the OSVERSIONINFO structure that is
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returned to the caller with Windows 95 credentials.
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--*/
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BOOL
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APIHOOK(GetVersionExW)(
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OUT LPOSVERSIONINFOW lpVersionInformation
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)
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{
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g_dwCount++;
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if (g_dwCount < g_dwDelay) {
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return ORIGINAL_API(GetVersionExW)(lpVersionInformation);
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} else {
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BOOL bReturn = FALSE;
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if (ORIGINAL_API(GetVersionExW)(lpVersionInformation)) {
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LOGN(eDbgLevelInfo, "[GetVersionExW] Return Win95");
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//
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// Fixup the structure with the Win95 data.
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//
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lpVersionInformation->dwMajorVersion = 4;
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lpVersionInformation->dwMinorVersion = 0;
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lpVersionInformation->dwBuildNumber = 950;
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lpVersionInformation->dwPlatformId = 1;
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*lpVersionInformation->szCSDVersion = L'\0';
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bReturn = TRUE;
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}
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return bReturn;
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}
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}
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/*++
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This stub function returns Windows 95 credentials.
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--*/
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DWORD
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APIHOOK(GetVersion)()
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{
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g_dwCount++;
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if (g_dwCount < g_dwDelay) {
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return ORIGINAL_API(GetVersion)();
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} else {
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LOGN(eDbgLevelInfo, "[GetVersion] Return Win95");
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return (DWORD)0xC3B60004;
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}
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}
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/*++
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Register hooked functions
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--*/
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BOOL
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NOTIFY_FUNCTION(
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DWORD fdwReason
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)
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{
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if (fdwReason == DLL_PROCESS_ATTACH)
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{
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CSTRING_TRY
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{
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CString csCl(COMMAND_LINE);
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if (!csCl.IsEmpty())
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{
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WCHAR * unused;
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g_dwDelay = wcstol(csCl, &unused, 10);
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}
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DPFN(eDbgLevelInfo, "Delaying version lie by %d", g_dwDelay);
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}
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CSTRING_CATCH
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{
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return FALSE;
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}
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}
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return TRUE;
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}
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HOOK_BEGIN
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CALL_NOTIFY_FUNCTION
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APIHOOK_ENTRY(KERNEL32.DLL, GetVersion)
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APIHOOK_ENTRY(KERNEL32.DLL, GetVersionExA)
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APIHOOK_ENTRY(KERNEL32.DLL, GetVersionExW)
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HOOK_END
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IMPLEMENT_SHIM_END
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