Leaked source code of windows server 2003
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/*++
Copyright (c) 2000-2002 Microsoft Corporation
Module Name:
EmulateUSER.cpp
Abstract:
EmulateSetWindowsHook:
Handles a behaviour difference on the arguments passed to
SetWindowsHook, for the case where:
(hMod == NULL) && (dwThreadId == 0)
According to MSDN:
An error may occur if the hMod parameter is NULL and the dwThreadId
parameter is zero or specifies the identifier of a thread created
by another process.
So the NT behaviour is correct. However, on win9x, hMod was assumed to
be the current module if NULL and dwThreadId == 0.
Note: this doesn't affect the case where the thread belongs to another
process.
ForceTemporaryModeChange:
A hack for several apps that permanently change the display mode and
fail to restore it correctly. Some of these apps do restore the
resolution, but not the refresh rate. 1024x768 @ 60Hz looks really bad.
Also includes a hack for cursors: the cursor visibility count is not
persistent through mode changes.
CorrectWndProc:
When you specify a NULL window proc we make it DefWindowProc instead to
mimic the 9x behavior.
EmulateToASCII:
Remove stray characters from ToAscii. This usually manifests itself as
a locked keyboard since this is the API that's used to convert the scan
codes to actual characters.
EmulateShowWindow:
Win9x didn't use the high bits of nCmdShow, which means they got
stripped off.
EmulateGetMessage:
Check wMsgFilterMax in GetMessage and PeekMessage for bad values and if
found change them to 0x7FFF.
PaletteRestore:
Persist palette state through mode switches. This includes the entries
themselves and the usage flag (see SetSystemPaletteUse).
Notes:
This is a general purpose shim.
History:
01/20/2000 linstev Created
02/18/2002 mnikkel Added check for null pointer in RegisterClassA.
Changed InitializeCriticalSection to InitializeCriticalSectionandSpinCount.
Added failure check in toascii and toasciiex
--*/
#include "precomp.h"
IMPLEMENT_SHIM_BEGIN(EmulateUSER)
#include "ShimHookMacro.h"
APIHOOK_ENUM_BEGIN
APIHOOK_ENUM_ENTRY(SetWindowsHookExA)
APIHOOK_ENUM_ENTRY(SetWindowLongA)
APIHOOK_ENUM_ENTRY(RegisterClassA)
APIHOOK_ENUM_ENTRY(ChangeDisplaySettingsA)
APIHOOK_ENUM_ENTRY(ChangeDisplaySettingsExA)
APIHOOK_ENUM_ENTRY(ToAscii)
APIHOOK_ENUM_ENTRY(ToAsciiEx)
APIHOOK_ENUM_ENTRY(ShowWindow)
APIHOOK_ENUM_ENTRY(PeekMessageA)
APIHOOK_ENUM_ENTRY(GetMessageA)
APIHOOK_ENUM_ENTRY(SetSystemPaletteUse)
APIHOOK_ENUM_ENTRY(AnimatePalette)
APIHOOK_ENUM_ENTRY(RealizePalette)
APIHOOK_ENUM_END
CRITICAL_SECTION g_csPalette;
UINT g_uPaletteLastUse = SYSPAL_STATIC;
DWORD g_peTable[256] =
{
0x00000000, 0x00000080, 0x00008000, 0x00008080,
0x00800000, 0x00800080, 0x00808000, 0x00C0C0C0,
0x00C0DCC0, 0x00F0CAA6, 0x00081824, 0x00142830,
0x0018303C, 0x00304D61, 0x0051514D, 0x004D7161,
0x00826D61, 0x000C1414, 0x00597582, 0x00759E08,
0x00303438, 0x00AA6938, 0x00203428, 0x00496161,
0x0049869E, 0x007D9A6D, 0x000869CB, 0x008E8682,
0x0075615D, 0x000061EB, 0x00000871, 0x002C3830,
0x000471EF, 0x008E92AA, 0x00306DF7, 0x0004C3C3,
0x0092AAB2, 0x00101814, 0x00040C08, 0x000C7110,
0x00CFA282, 0x000008AA, 0x0028412C, 0x00498EB2,
0x00204D61, 0x00555955, 0x0004D3D3, 0x001C3C4D,
0x0020A6F7, 0x0010A210, 0x0018241C, 0x005DAEF3,
0x00719EAA, 0x00B2E720, 0x00102871, 0x0086C3D3,
0x00288A2C, 0x000C51BA, 0x0059716D, 0x00494D4D,
0x00AAB6C3, 0x00005100, 0x0020CBF7, 0x004D8A51,
0x00BEC7B2, 0x00043CBA, 0x00101C18, 0x000851DF,
0x00A6E7A6, 0x009ECF24, 0x00797592, 0x00AE7559,
0x009E8269, 0x00CFE3DF, 0x000C2030, 0x0028692C,
0x009EA2A2, 0x00F7C782, 0x0034617D, 0x00B6BEBE,
0x00969E86, 0x00DBFBD3, 0x00655149, 0x0065EF65,
0x00AED3D3, 0x00E7924D, 0x00B2BEB2, 0x00D7DBDB,
0x00797571, 0x00344D59, 0x0086B2CF, 0x00512C14,
0x00A6FBFB, 0x00385965, 0x00828E92, 0x001C4161,
0x00595961, 0x00002000, 0x003C6D7D, 0x005DB2D7,
0x0038EF3C, 0x0051CB55, 0x001C2424, 0x0061C3F3,
0x0008A2A2, 0x0038413C, 0x00204951, 0x00108A14,
0x00103010, 0x007DE7F7, 0x00143449, 0x00B2652C,
0x00F7EBAA, 0x003C7192, 0x0004FBFB, 0x00696151,
0x00EFC796, 0x000441D7, 0x00000404, 0x00388AF7,
0x008AD3F3, 0x00006500, 0x000004E3, 0x00DBFFFF,
0x00F7AE69, 0x00CF864D, 0x0055A2D3, 0x00EBEFE3,
0x00EB8A41, 0x00CF9261, 0x00C3F710, 0x008E8E82,
0x00FBFFFF, 0x00104110, 0x00040851, 0x0082FBFB,
0x003CC734, 0x00088A8A, 0x00384545, 0x00514134,
0x003C7996, 0x001C6161, 0x00EBB282, 0x00004100,
0x00715951, 0x00A2AAA6, 0x00B2B6B2, 0x00C3FBFB,
0x00000834, 0x0028413C, 0x00C7C7CF, 0x00CFD3D3,
0x00824520, 0x0008CB0C, 0x001C1C1C, 0x00A6B29A,
0x0071A6BE, 0x00CF9E6D, 0x006D7161, 0x00008A04,
0x005171BE, 0x00C7D3C3, 0x00969E96, 0x00798696,
0x002C1C10, 0x00385149, 0x00BE7538, 0x0008141C,
0x00C3C7C7, 0x00202C28, 0x00D3E3CF, 0x0071826D,
0x00653C1C, 0x0004EF08, 0x00345575, 0x006D92A6,
0x00797979, 0x0086F38A, 0x00925528, 0x00E3E7E7,
0x00456151, 0x001C499A, 0x00656961, 0x008E9EA2,
0x007986D3, 0x00204151, 0x008AC7E3, 0x00007100,
0x00519EBE, 0x0010510C, 0x00A6AAAA, 0x002C3030,
0x00D37934, 0x00183030, 0x0049828E, 0x00CBFBC3,
0x006D7171, 0x000428A6, 0x004D4545, 0x00040C14,
0x00087575, 0x0071CB79, 0x004D6D0C, 0x00FBFBD3,
0x00AAB2AE, 0x00929292, 0x00F39E55, 0x00005D00,
0x00E3D7B2, 0x00F7FBC3, 0x003C5951, 0x0004B2B2,
0x0034658E, 0x000486EF, 0x00F7FBE3, 0x00616161,
0x00DFE3DF, 0x001C100C, 0x0008100C, 0x0008180C,
0x00598600, 0x0024FBFB, 0x00346171, 0x00042CC7,
0x00AEC79A, 0x0045AE4D, 0x0028A62C, 0x00EFA265,
0x007D8282, 0x00F7D79A, 0x0065D3F7, 0x00E3E7BA,
0x00003000, 0x00245571, 0x00DF823C, 0x008AAEC3,
0x00A2C3D3, 0x00A6FBA2, 0x00F3FFF3, 0x00AAD7E7,
0x00EFEFC3, 0x0055F7FB, 0x00EFF3F3, 0x00BED3B2,
0x0004EBEB, 0x00A6E3F7, 0x00F0FBFF, 0x00A4A0A0,
0x00808080, 0x000000FF, 0x0000FF00, 0x0000FFFF,
0x00FF0000, 0x00FF00FF, 0x00FFFF00, 0x00FFFFFF
};
#define MODE_MASK (CDS_UPDATEREGISTRY | CDS_TEST | CDS_FULLSCREEN | CDS_GLOBAL | CDS_SET_PRIMARY | CDS_VIDEOPARAMETERS | CDS_RESET | CDS_NORESET)
/*++
Handle NULL for hModule
--*/
HHOOK
APIHOOK(SetWindowsHookExA)(
int idHook,
HOOKPROC lpfn,
HINSTANCE hMod,
DWORD dwThreadId
)
{
if (!hMod && !dwThreadId) {
LOGN(
eDbgLevelError,
"[SetWindowsHookExA] hMod is NULL - correcting.");
hMod = GetModuleHandle(NULL);
}
return ORIGINAL_API(SetWindowsHookExA)(
idHook,
lpfn,
hMod,
dwThreadId);
}
/*++
Set the WndProc to DefWndProc if it's NULL.
--*/
LONG
APIHOOK(SetWindowLongA)(
HWND hWnd,
int nIndex,
LONG dwNewLong
)
{
if ((nIndex == GWL_WNDPROC) && (dwNewLong == 0)) {
LOGN(eDbgLevelError, "[SetWindowLongA] Null WndProc specified - correcting.");
dwNewLong = (LONG) DefWindowProcA;
}
return ORIGINAL_API(SetWindowLongA)(hWnd, nIndex, dwNewLong);
}
/*++
Set the WndProc to DefWndProc if it's NULL.
--*/
ATOM
APIHOOK(RegisterClassA)(
CONST WNDCLASSA *lpWndClass
)
{
if (lpWndClass && !(lpWndClass->lpfnWndProc)) {
WNDCLASSA wcNewWndClass = *lpWndClass;
LOGN(eDbgLevelError, "[RegisterClassA] Null WndProc specified - correcting.");
wcNewWndClass.lpfnWndProc = DefWindowProcA;
return ORIGINAL_API(RegisterClassA)(&wcNewWndClass);
}
else
{
return ORIGINAL_API(RegisterClassA)(lpWndClass);
}
}
/*++
Change the palette entries if applicable.
--*/
void
FixPalette()
{
EnterCriticalSection(&g_csPalette);
//
// We realized a palette before this, so let's have a go at restoring
// all the palette state.
//
HDC hdc = GetDC(GetActiveWindow());
if (hdc) {
if (GetDeviceCaps(hdc, RASTERCAPS) & RC_PALETTE) {
//
// We're now in a palettized mode
//
SetSystemPaletteUse(hdc, g_uPaletteLastUse);
LPLOGPALETTE plogpal = (LPLOGPALETTE) malloc(sizeof(LOGPALETTE) + sizeof(g_peTable));
if (plogpal) {
//
// Create a palette we can realize
//
plogpal->palVersion = 0x0300;
plogpal->palNumEntries = 256;
MoveMemory(&plogpal->palPalEntry[0], &g_peTable[0], sizeof(g_peTable));
HPALETTE hPal = CreatePalette(plogpal);
if (hPal) {
//
// Realize the palette
//
HPALETTE hOld = SelectPalette(hdc, hPal, FALSE);
RealizePalette(hdc);
SelectPalette(hdc, hOld, FALSE);
DeleteObject(hPal);
}
free(plogpal);
}
}
ReleaseDC(0, hdc);
}
LeaveCriticalSection(&g_csPalette);
}
/*++
Force temporary change, fixup cursor and palette.
--*/
LONG
APIHOOK(ChangeDisplaySettingsA)(
LPDEVMODEA lpDevMode,
DWORD dwFlags
)
{
dwFlags &= MODE_MASK;
if (dwFlags == 0 || dwFlags == CDS_UPDATEREGISTRY) {
dwFlags = CDS_FULLSCREEN;
LOGN(eDbgLevelError,
"[ChangeDisplaySettingsA] Changing flags to CDS_FULLSCREEN.");
}
ShowCursor(FALSE);
INT iCntOld = ShowCursor(TRUE);
LONG lRet = ORIGINAL_API(ChangeDisplaySettingsA)(
lpDevMode,
dwFlags);
INT iCntNew = ShowCursor(FALSE);
while (iCntNew != iCntOld) {
iCntNew = ShowCursor(iCntNew < iCntOld ? TRUE : FALSE);
}
FixPalette();
return lRet;
}
/*++
Force temporary change, fixup cursor and palette.
--*/
LONG
APIHOOK(ChangeDisplaySettingsExA)(
LPCSTR lpszDeviceName,
LPDEVMODEA lpDevMode,
HWND hwnd,
DWORD dwFlags,
LPVOID lParam
)
{
dwFlags &= MODE_MASK;
if (dwFlags == 0 || dwFlags == CDS_UPDATEREGISTRY) {
dwFlags = CDS_FULLSCREEN;
LOGN(eDbgLevelError,
"[ChangeDisplaySettingsExA] Changing flags to CDS_FULLSCREEN.");
}
ShowCursor(FALSE);
INT iCntOld = ShowCursor(TRUE);
LONG lRet = ORIGINAL_API(ChangeDisplaySettingsExA)(
lpszDeviceName,
lpDevMode,
hwnd,
dwFlags,
lParam);
INT iCntNew = ShowCursor(FALSE);
while (iCntNew != iCntOld) {
iCntNew = ShowCursor(iCntNew < iCntOld ? TRUE : FALSE);
}
FixPalette();
return lRet;
}
/*++
Remove stray characters from the end of a translation.
--*/
int
APIHOOK(ToAscii)(
UINT wVirtKey,
UINT wScanCode,
PBYTE lpKeyState,
LPWORD lpChar,
UINT wFlags
)
{
int iRet = ORIGINAL_API(ToAscii)(
wVirtKey,
wScanCode,
lpKeyState,
lpChar,
wFlags);
// if zero or one char was translated.
if (iRet == 0 || iRet == 1)
{
LPBYTE p = (LPBYTE)lpChar;
p[iRet] = '\0';
}
return iRet;
}
/*++
Remove stray characters from the end of a translation.
--*/
int
APIHOOK(ToAsciiEx)(
UINT wVirtKey,
UINT wScanCode,
PBYTE lpKeyState,
LPWORD lpChar,
UINT wFlags,
HKL dwhkl
)
{
int iRet = ORIGINAL_API(ToAsciiEx)(
wVirtKey,
wScanCode,
lpKeyState,
lpChar,
wFlags,
dwhkl);
// if zero or one char was translated.
if (iRet == 0 || iRet == 1)
{
LPBYTE p = (LPBYTE) lpChar;
p[iRet] = '\0';
}
return iRet;
}
/*++
Strip the high bits off nCmdShow
--*/
LONG
APIHOOK(ShowWindow)(
HWND hWnd,
int nCmdShow
)
{
if (nCmdShow & 0xFFFF0000) {
LOGN( eDbgLevelWarning, "[ShowWindow] Fixing invalid parameter");
// Remove high bits
nCmdShow &= 0xFFFF;
}
return ORIGINAL_API(ShowWindow)(hWnd, nCmdShow);
}
/*++
This fixes the bad wMsgFilterMax parameter.
--*/
BOOL
APIHOOK(PeekMessageA)(
LPMSG lpMsg,
HWND hWnd,
UINT wMsgFilterMin,
UINT wMsgFilterMax,
UINT wRemoveMsg
)
{
if ((wMsgFilterMin == 0) && (wMsgFilterMax == 0xFFFFFFFF)) {
LOGN( eDbgLevelWarning, "[PeekMessageA] Correcting parameters");
wMsgFilterMax = 0;
}
return ORIGINAL_API(PeekMessageA)(
lpMsg,
hWnd,
wMsgFilterMin,
wMsgFilterMax,
wRemoveMsg);
}
/*++
This fixes the bad wMsgFilterMax parameter.
--*/
BOOL
APIHOOK(GetMessageA)(
LPMSG lpMsg,
HWND hWnd,
UINT wMsgFilterMin,
UINT wMsgFilterMax
)
{
if ((wMsgFilterMin == 0) && (wMsgFilterMax == 0xFFFFFFFF)) {
LOGN( eDbgLevelWarning, "[GetMessageA] Correcting parameters");
wMsgFilterMax = 0;
}
return ORIGINAL_API(GetMessageA)(
lpMsg,
hWnd,
wMsgFilterMin,
wMsgFilterMax);
}
/*++
Track the system palette use
--*/
UINT
APIHOOK(SetSystemPaletteUse)(
HDC hdc,
UINT uUsage
)
{
EnterCriticalSection(&g_csPalette);
g_uPaletteLastUse = uUsage;
UINT uRet = ORIGINAL_API(SetSystemPaletteUse)(hdc, uUsage);
LeaveCriticalSection(&g_csPalette);
return uRet;
}
/*++
Fill in the last known palette if anything was realized
--*/
UINT
APIHOOK(RealizePalette)(
HDC hdc
)
{
EnterCriticalSection(&g_csPalette);
UINT uRet = ORIGINAL_API(RealizePalette)(hdc);
if (uRet) {
//
// Copy the current logical palette to our global store
//
HPALETTE hPal = (HPALETTE) GetCurrentObject(hdc, OBJ_PAL);
if (hPal) {
GetPaletteEntries(hPal, 0, 256, (PALETTEENTRY *)&g_peTable);
}
}
LeaveCriticalSection(&g_csPalette);
return uRet;
}
/*++
Update our private palette with the new entries.
--*/
BOOL
APIHOOK(AnimatePalette)(
HPALETTE hPal,
UINT iStartIndex,
UINT cEntries,
CONST PALETTEENTRY *ppe
)
{
EnterCriticalSection(&g_csPalette);
BOOL bRet = ORIGINAL_API(AnimatePalette)(hPal, iStartIndex, cEntries, ppe);
if (bRet) {
//
// We have to populate our global settings
//
PALETTEENTRY peTable[256];
if (GetPaletteEntries(hPal, iStartIndex, cEntries, &peTable[iStartIndex]) == cEntries) {
//
// Replace all the entries in our global table that are reserved
// for animation.
//
for (UINT i=iStartIndex; i<iStartIndex + cEntries; i++) {
LPPALETTEENTRY p = (LPPALETTEENTRY)&g_peTable[i];
if (p->peFlags & PC_RESERVED) {
//
// This entry is being animated
//
p->peRed = peTable[i].peRed;
p->peGreen = peTable[i].peGreen;
p->peBlue = peTable[i].peBlue;
}
}
}
}
LeaveCriticalSection(&g_csPalette);
return bRet;
}
/*++
Register hooked functions
--*/
BOOL
NOTIFY_FUNCTION(
DWORD fdwReason
)
{
if (fdwReason == DLL_PROCESS_ATTACH) {
//
// Critical section for palette globals
//
return InitializeCriticalSectionAndSpinCount(&g_csPalette,0x80000000);
}
return TRUE;
}
HOOK_BEGIN
CALL_NOTIFY_FUNCTION
APIHOOK_ENTRY(USER32.DLL, SetWindowsHookExA)
APIHOOK_ENTRY(USER32.DLL, SetWindowLongA)
APIHOOK_ENTRY(USER32.DLL, RegisterClassA)
APIHOOK_ENTRY(USER32.DLL, ChangeDisplaySettingsA)
APIHOOK_ENTRY(USER32.DLL, ChangeDisplaySettingsExA)
APIHOOK_ENTRY(USER32.DLL, ToAscii)
APIHOOK_ENTRY(USER32.DLL, ToAsciiEx)
APIHOOK_ENTRY(USER32.DLL, ShowWindow)
APIHOOK_ENTRY(USER32.DLL, PeekMessageA)
APIHOOK_ENTRY(USER32.DLL, GetMessageA)
APIHOOK_ENTRY(GDI32.DLL, SetSystemPaletteUse);
APIHOOK_ENTRY(GDI32.DLL, AnimatePalette);
APIHOOK_ENTRY(GDI32.DLL, RealizePalette);
HOOK_END
IMPLEMENT_SHIM_END