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reactos/win32ss/user/ntuser/desktop.c
Andriy Shevchenko 2ea03b5b22
[REACTOS] Fix typos in comments (#5591) 
Fixing typos in code comments enhances code readability and comprehension for developers and collaborators.
2023-08-22 16:20:29 +03:00

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS Win32k subsystem
* PURPOSE: Desktops
* FILE: subsystems/win32/win32k/ntuser/desktop.c
* PROGRAMMER: Casper S. Hornstrup (chorns@users.sourceforge.net)
*/
/* INCLUDES ******************************************************************/
#include <win32k.h>
DBG_DEFAULT_CHANNEL(UserDesktop);
#include <reactos/buildno.h>
static NTSTATUS
UserInitializeDesktop(PDESKTOP pdesk, PUNICODE_STRING DesktopName, PWINSTATION_OBJECT pwinsta);
static NTSTATUS
IntMapDesktopView(IN PDESKTOP pdesk);
static NTSTATUS
IntUnmapDesktopView(IN PDESKTOP pdesk);
static VOID
IntFreeDesktopHeap(IN PDESKTOP pdesk);
/* GLOBALS *******************************************************************/
/* These can be changed via CSRSS startup, these are defaults */
DWORD gdwDesktopSectionSize = 512;
DWORD gdwNOIOSectionSize = 128; // A guess, for one or more of the first three system desktops.
/* Currently active desktop */
PDESKTOP gpdeskInputDesktop = NULL;
HDC ScreenDeviceContext = NULL;
PTHREADINFO gptiDesktopThread = NULL;
HCURSOR gDesktopCursor = NULL;
PKEVENT gpDesktopThreadStartedEvent = NULL;
/* OBJECT CALLBACKS **********************************************************/
NTSTATUS
APIENTRY
IntDesktopObjectParse(IN PVOID ParseObject,
IN PVOID ObjectType,
IN OUT PACCESS_STATE AccessState,
IN KPROCESSOR_MODE AccessMode,
IN ULONG Attributes,
IN OUT PUNICODE_STRING CompleteName,
IN OUT PUNICODE_STRING RemainingName,
IN OUT PVOID Context OPTIONAL,
IN PSECURITY_QUALITY_OF_SERVICE SecurityQos OPTIONAL,
OUT PVOID *Object)
{
NTSTATUS Status;
PDESKTOP Desktop;
OBJECT_ATTRIBUTES ObjectAttributes;
PLIST_ENTRY NextEntry, ListHead;
PWINSTATION_OBJECT WinStaObject = (PWINSTATION_OBJECT)ParseObject;
UNICODE_STRING DesktopName;
PBOOLEAN pContext = (PBOOLEAN) Context;
if (pContext)
*pContext = FALSE;
/* Set the list pointers and loop the window station */
ListHead = &WinStaObject->DesktopListHead;
NextEntry = ListHead->Flink;
while (NextEntry != ListHead)
{
/* Get the current desktop */
Desktop = CONTAINING_RECORD(NextEntry, DESKTOP, ListEntry);
/* Get the desktop name */
ASSERT(Desktop->pDeskInfo != NULL);
RtlInitUnicodeString(&DesktopName, Desktop->pDeskInfo->szDesktopName);
/* Compare the name */
if (RtlEqualUnicodeString(RemainingName,
&DesktopName,
(Attributes & OBJ_CASE_INSENSITIVE) != 0))
{
/* We found a match. Did this come from a create? */
if (Context)
{
/* Unless OPEN_IF was given, fail with an error */
if (!(Attributes & OBJ_OPENIF))
{
/* Name collision */
return STATUS_OBJECT_NAME_COLLISION;
}
else
{
/* Otherwise, return with a warning only */
Status = STATUS_OBJECT_NAME_EXISTS;
}
}
else
{
/* This was a real open, so this is OK */
Status = STATUS_SUCCESS;
}
/* Reference the desktop and return it */
ObReferenceObject(Desktop);
*Object = Desktop;
return Status;
}
/* Go to the next desktop */
NextEntry = NextEntry->Flink;
}
/* If we got here but this isn't a create, just fail */
if (!Context) return STATUS_OBJECT_NAME_NOT_FOUND;
/* Create the desktop object */
InitializeObjectAttributes(&ObjectAttributes, RemainingName, 0, NULL, NULL);
Status = ObCreateObject(KernelMode,
ExDesktopObjectType,
&ObjectAttributes,
KernelMode,
NULL,
sizeof(DESKTOP),
0,
0,
(PVOID*)&Desktop);
if (!NT_SUCCESS(Status)) return Status;
/* Assign security to the desktop we have created */
Status = IntAssignDesktopSecurityOnParse(WinStaObject, Desktop, AccessState);
if (!NT_SUCCESS(Status))
{
ObDereferenceObject(Desktop);
return Status;
}
/* Initialize the desktop */
Status = UserInitializeDesktop(Desktop, RemainingName, WinStaObject);
if (!NT_SUCCESS(Status))
{
ObDereferenceObject(Desktop);
return Status;
}
/* Set the desktop object and return success */
*Object = Desktop;
*pContext = TRUE;
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
IntDesktopObjectDelete(
_In_ PVOID Parameters)
{
PWIN32_DELETEMETHOD_PARAMETERS DeleteParameters = Parameters;
PDESKTOP pdesk = (PDESKTOP)DeleteParameters->Object;
TRACE("Deleting desktop object 0x%p\n", pdesk);
if (pdesk->pDeskInfo &&
pdesk->pDeskInfo->spwnd)
{
ASSERT(pdesk->pDeskInfo->spwnd->spwndChild == NULL);
co_UserDestroyWindow(pdesk->pDeskInfo->spwnd);
}
if (pdesk->spwndMessage)
co_UserDestroyWindow(pdesk->spwndMessage);
/* Remove the desktop from the window station's list of associated desktops */
RemoveEntryList(&pdesk->ListEntry);
/* Free the heap */
IntFreeDesktopHeap(pdesk);
ObDereferenceObject(pdesk->rpwinstaParent);
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
IntDesktopOkToClose(
_In_ PVOID Parameters)
{
PWIN32_OKAYTOCLOSEMETHOD_PARAMETERS OkToCloseParameters = Parameters;
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
if (pti == NULL)
{
/* This happens when we leak desktop handles */
return STATUS_SUCCESS;
}
/* Do not allow the current desktop or the initial desktop to be closed */
if (OkToCloseParameters->Handle == pti->ppi->hdeskStartup ||
OkToCloseParameters->Handle == pti->hdesk)
{
return STATUS_ACCESS_DENIED;
}
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
IntDesktopObjectOpen(
_In_ PVOID Parameters)
{
NTSTATUS Ret;
PWIN32_OPENMETHOD_PARAMETERS OpenParameters = Parameters;
PPROCESSINFO ppi = PsGetProcessWin32Process(OpenParameters->Process);
if (ppi == NULL)
return STATUS_SUCCESS;
UserEnterExclusive();
Ret = IntMapDesktopView((PDESKTOP)OpenParameters->Object);
UserLeave();
return Ret;
}
NTSTATUS
NTAPI
IntDesktopObjectClose(
_In_ PVOID Parameters)
{
NTSTATUS Ret;
PWIN32_CLOSEMETHOD_PARAMETERS CloseParameters = Parameters;
PPROCESSINFO ppi = PsGetProcessWin32Process(CloseParameters->Process);
if (ppi == NULL)
{
/* This happens when the process leaks desktop handles.
* At this point the PPROCESSINFO is already destroyed */
return STATUS_SUCCESS;
}
UserEnterExclusive();
Ret = IntUnmapDesktopView((PDESKTOP)CloseParameters->Object);
UserLeave();
return Ret;
}
/* PRIVATE FUNCTIONS **********************************************************/
CODE_SEG("INIT")
NTSTATUS
NTAPI
InitDesktopImpl(VOID)
{
GENERIC_MAPPING IntDesktopMapping = { DESKTOP_READ,
DESKTOP_WRITE,
DESKTOP_EXECUTE,
DESKTOP_ALL_ACCESS};
/* Set Desktop Object Attributes */
ExDesktopObjectType->TypeInfo.DefaultNonPagedPoolCharge = sizeof(DESKTOP);
ExDesktopObjectType->TypeInfo.GenericMapping = IntDesktopMapping;
ExDesktopObjectType->TypeInfo.ValidAccessMask = DESKTOP_ALL_ACCESS;
/* Allocate memory for the event structure */
gpDesktopThreadStartedEvent = ExAllocatePoolWithTag(NonPagedPool,
sizeof(KEVENT),
USERTAG_EVENT);
if (!gpDesktopThreadStartedEvent)
{
ERR("Failed to allocate event!\n");
return STATUS_NO_MEMORY;
}
/* Initialize the kernel event */
KeInitializeEvent(gpDesktopThreadStartedEvent,
SynchronizationEvent,
FALSE);
return STATUS_SUCCESS;
}
static NTSTATUS
GetSystemVersionString(OUT PWSTR pwszzVersion,
IN SIZE_T cchDest,
IN BOOLEAN InSafeMode,
IN BOOLEAN AppendNtSystemRoot)
{
NTSTATUS Status;
RTL_OSVERSIONINFOEXW VerInfo;
UNICODE_STRING BuildLabString;
UNICODE_STRING CSDVersionString;
RTL_QUERY_REGISTRY_TABLE VersionConfigurationTable[] =
{
{
NULL,
RTL_QUERY_REGISTRY_DIRECT,
L"BuildLab",
&BuildLabString,
REG_NONE, NULL, 0
},
{
NULL,
RTL_QUERY_REGISTRY_DIRECT,
L"CSDVersion",
&CSDVersionString,
REG_NONE, NULL, 0
},
{0}
};
WCHAR BuildLabBuffer[256];
WCHAR VersionBuffer[256];
PWCHAR EndBuffer;
VerInfo.dwOSVersionInfoSize = sizeof(VerInfo);
/*
* This call is uniquely used to retrieve the current CSD numbers.
* All the rest (major, minor, ...) is either retrieved from the
* SharedUserData structure, or from the registry.
*/
RtlGetVersion((PRTL_OSVERSIONINFOW)&VerInfo);
/*
* - Retrieve the BuildLab string from the registry (set by the kernel).
* - In kernel-mode, szCSDVersion is not initialized. Initialize it
* and query its value from the registry.
*/
RtlZeroMemory(BuildLabBuffer, sizeof(BuildLabBuffer));
RtlInitEmptyUnicodeString(&BuildLabString,
BuildLabBuffer,
sizeof(BuildLabBuffer));
RtlZeroMemory(VerInfo.szCSDVersion, sizeof(VerInfo.szCSDVersion));
RtlInitEmptyUnicodeString(&CSDVersionString,
VerInfo.szCSDVersion,
sizeof(VerInfo.szCSDVersion));
Status = RtlQueryRegistryValues(RTL_REGISTRY_WINDOWS_NT,
L"",
VersionConfigurationTable,
NULL,
NULL);
if (!NT_SUCCESS(Status))
{
/* Indicate nothing is there */
BuildLabString.Length = 0;
CSDVersionString.Length = 0;
}
/* NULL-terminate the strings */
BuildLabString.Buffer[BuildLabString.Length / sizeof(WCHAR)] = UNICODE_NULL;
CSDVersionString.Buffer[CSDVersionString.Length / sizeof(WCHAR)] = UNICODE_NULL;
EndBuffer = VersionBuffer;
if ( /* VerInfo.wServicePackMajor != 0 && */ CSDVersionString.Length)
{
/* Print the version string */
Status = RtlStringCbPrintfExW(VersionBuffer,
sizeof(VersionBuffer),
&EndBuffer,
NULL,
0,
L": %wZ",
&CSDVersionString);
if (!NT_SUCCESS(Status))
{
/* No version, NULL-terminate the string */
*EndBuffer = UNICODE_NULL;
}
}
else
{
/* No version, NULL-terminate the string */
*EndBuffer = UNICODE_NULL;
}
if (InSafeMode)
{
/* String for Safe Mode */
Status = RtlStringCchPrintfW(pwszzVersion,
cchDest,
L"ReactOS Version %S %wZ (NT %u.%u Build %u%s)\n",
KERNEL_VERSION_STR,
&BuildLabString,
SharedUserData->NtMajorVersion,
SharedUserData->NtMinorVersion,
(VerInfo.dwBuildNumber & 0xFFFF),
VersionBuffer);
if (AppendNtSystemRoot && NT_SUCCESS(Status))
{
Status = RtlStringCbPrintfW(VersionBuffer,
sizeof(VersionBuffer),
L" - %s\n",
SharedUserData->NtSystemRoot);
if (NT_SUCCESS(Status))
{
/* Replace the last newline by a NULL, before concatenating */
EndBuffer = wcsrchr(pwszzVersion, L'\n');
if (EndBuffer) *EndBuffer = UNICODE_NULL;
/* The concatenated string has a terminating newline */
Status = RtlStringCchCatW(pwszzVersion,
cchDest,
VersionBuffer);
if (!NT_SUCCESS(Status))
{
/* Concatenation failed, put back the newline */
if (EndBuffer) *EndBuffer = L'\n';
}
}
/* Override any failures as the NtSystemRoot string is optional */
Status = STATUS_SUCCESS;
}
}
else
{
/* Multi-string for Normal Mode */
Status = RtlStringCchPrintfW(pwszzVersion,
cchDest,
L"ReactOS Version %S\n"
L"Build %wZ\n"
L"Reporting NT %u.%u (Build %u%s)\n",
KERNEL_VERSION_STR,
&BuildLabString,
SharedUserData->NtMajorVersion,
SharedUserData->NtMinorVersion,
(VerInfo.dwBuildNumber & 0xFFFF),
VersionBuffer);
if (AppendNtSystemRoot && NT_SUCCESS(Status))
{
Status = RtlStringCbPrintfW(VersionBuffer,
sizeof(VersionBuffer),
L"%s\n",
SharedUserData->NtSystemRoot);
if (NT_SUCCESS(Status))
{
Status = RtlStringCchCatW(pwszzVersion,
cchDest,
VersionBuffer);
}
/* Override any failures as the NtSystemRoot string is optional */
Status = STATUS_SUCCESS;
}
}
if (!NT_SUCCESS(Status))
{
/* Fall-back string */
Status = RtlStringCchPrintfW(pwszzVersion,
cchDest,
L"ReactOS Version %S %wZ\n",
KERNEL_VERSION_STR,
&BuildLabString);
if (!NT_SUCCESS(Status))
{
/* General failure, NULL-terminate the string */
pwszzVersion[0] = UNICODE_NULL;
}
}
/*
* Convert the string separators (newlines) into NULLs
* and NULL-terminate the multi-string.
*/
while (*pwszzVersion)
{
EndBuffer = wcschr(pwszzVersion, L'\n');
if (!EndBuffer) break;
pwszzVersion = EndBuffer;
*pwszzVersion++ = UNICODE_NULL;
}
*pwszzVersion = UNICODE_NULL;
return Status;
}
/*
* IntResolveDesktop
*
* The IntResolveDesktop function attempts to retrieve valid handles to
* a desktop and a window station suitable for the specified process.
* The specified desktop path string is used only as a hint for the resolution.
*
* - If the process is already assigned to a window station and a desktop,
* handles to these objects are returned directly regardless of the specified
* desktop path string. This is what happens when this function is called for
* a process that has been already started and connected to the Win32 USER.
*
* - If the process is being connected to the Win32 USER, or is in a state
* where a window station is assigned to it but no desktop yet, the desktop
* path string is used as a hint for the resolution.
* A specified window station (if any, otherwise "WinSta0" is used as default)
* is tested for existence and accessibility. If the checks are OK a handle
* to it is returned. Otherwise we either fail (the window station does not
* exist) or, in case a default window station was used, we attempt to open
* or create a non-interactive Service-0xXXXX-YYYY$ window station. This is
* typically what happens when a non-interactive process is started while
* the WinSta0 window station was used as the default one.
* A specified desktop (if any, otherwise "Default" is used as default)
* is then tested for existence on the opened window station.
*
* - Rules for the choice of the default window station, when none is specified
* in the desktop path:
*
* 1. By default, a SYSTEM process connects to a non-interactive window
* station, either the Service-0x0-3e7$ (from the SYSTEM LUID) station,
* or one that has been inherited and that is non-interactive.
* Only when the interactive window station WinSta0 is specified that
* the process can connect to it (e.g. the case of interactive services).
*
* 2. An interactive process, i.e. a process whose LUID is the same as the
* one assigned to WinSta0 by Winlogon on user logon, connects by default
* to the WinSta0 window station, unless it has inherited from another
* interactive window station (which must be... none other than WinSta0).
*
* 3. A non-interactive (but not SYSTEM) process connects by default to
* a non-interactive Service-0xXXXX-YYYY$ window station (whose name
* is derived from the process' LUID), or to another non-interactive
* window station that has been inherited.
* Otherwise it may be able connect to the interactive WinSta0 only if
* it has explicit access rights to it.
*
* Parameters
* Process
* The user process object.
*
* DesktopPath
* The desktop path string used as a hint for desktop resolution.
*
* bInherit
* Whether or not the returned handles are inheritable.
*
* phWinSta
* Pointer to a window station handle.
*
* phDesktop
* Pointer to a desktop handle.
*
* Return Value
* Status code.
*/
NTSTATUS
FASTCALL
IntResolveDesktop(
IN PEPROCESS Process,
IN PUNICODE_STRING DesktopPath,
IN BOOL bInherit,
OUT HWINSTA* phWinSta,
OUT HDESK* phDesktop)
{
NTSTATUS Status;
HWINSTA hWinSta = NULL, hWinStaDup = NULL;
HDESK hDesktop = NULL, hDesktopDup = NULL;
PPROCESSINFO ppi;
HANDLE hProcess = NULL;
LUID ProcessLuid;
USHORT StrSize;
SIZE_T MemSize;
PSECURITY_DESCRIPTOR ServiceSD;
POBJECT_ATTRIBUTES ObjectAttributes = NULL;
PUNICODE_STRING ObjectName;
UNICODE_STRING WinStaName, DesktopName;
const UNICODE_STRING WinSta0Name = RTL_CONSTANT_STRING(L"WinSta0");
PWINSTATION_OBJECT WinStaObject;
HWINSTA hTempWinSta = NULL;
BOOLEAN bUseDefaultWinSta = FALSE;
BOOLEAN bInteractive = FALSE;
BOOLEAN bAccessAllowed = FALSE;
ASSERT(UserIsEnteredExclusive());
ASSERT(phWinSta);
ASSERT(phDesktop);
ASSERT(DesktopPath);
*phWinSta = NULL;
*phDesktop = NULL;
ppi = PsGetProcessWin32Process(Process);
/* ppi is typically NULL for console applications that connect to Win32 USER */
if (!ppi) TRACE("IntResolveDesktop: ppi is NULL!\n");
if (ppi && ppi->hwinsta != NULL && ppi->hdeskStartup != NULL)
{
/*
* If this process is the current one, just return the cached handles.
* Otherwise, open the window station and desktop objects.
*/
if (Process == PsGetCurrentProcess())
{
hWinSta = ppi->hwinsta;
hDesktop = ppi->hdeskStartup;
}
else
{
Status = ObOpenObjectByPointer(ppi->prpwinsta,
0,
NULL,
MAXIMUM_ALLOWED,
ExWindowStationObjectType,
UserMode,
(PHANDLE)&hWinSta);
if (!NT_SUCCESS(Status))
{
ERR("IntResolveDesktop: Could not reference window station 0x%p\n", ppi->prpwinsta);
SetLastNtError(Status);
return Status;
}
Status = ObOpenObjectByPointer(ppi->rpdeskStartup,
0,
NULL,
MAXIMUM_ALLOWED,
ExDesktopObjectType,
UserMode,
(PHANDLE)&hDesktop);
if (!NT_SUCCESS(Status))
{
ERR("IntResolveDesktop: Could not reference desktop 0x%p\n", ppi->rpdeskStartup);
ObCloseHandle(hWinSta, UserMode);
SetLastNtError(Status);
return Status;
}
}
*phWinSta = hWinSta;
*phDesktop = hDesktop;
return STATUS_SUCCESS;
}
/* We will by default use the default window station and desktop */
RtlInitEmptyUnicodeString(&WinStaName, NULL, 0);
RtlInitEmptyUnicodeString(&DesktopName, NULL, 0);
/*
* Parse the desktop path string which can be of the form "WinSta\Desktop"
* or just "Desktop". In the latter case we use the default window station
* on which the process is attached to (or if none, "WinSta0").
*/
if (DesktopPath->Buffer != NULL && DesktopPath->Length > sizeof(WCHAR))
{
DesktopName = *DesktopPath;
/* Find the separator */
while (DesktopName.Length > 0 && *DesktopName.Buffer &&
*DesktopName.Buffer != OBJ_NAME_PATH_SEPARATOR)
{
DesktopName.Buffer++;
DesktopName.Length -= sizeof(WCHAR);
DesktopName.MaximumLength -= sizeof(WCHAR);
}
if (DesktopName.Length > 0)
{
RtlInitEmptyUnicodeString(&WinStaName, DesktopPath->Buffer,
DesktopPath->Length - DesktopName.Length);
// (USHORT)((ULONG_PTR)DesktopName.Buffer - (ULONG_PTR)DesktopPath->Buffer);
WinStaName.Length = WinStaName.MaximumLength;
/* Skip the separator */
DesktopName.Buffer++;
DesktopName.Length -= sizeof(WCHAR);
DesktopName.MaximumLength -= sizeof(WCHAR);
}
else
{
RtlInitEmptyUnicodeString(&WinStaName, NULL, 0);
DesktopName = *DesktopPath;
}
}
TRACE("IntResolveDesktop: WinStaName:'%wZ' ; DesktopName:'%wZ'\n", &WinStaName, &DesktopName);
/* Retrieve the process LUID */
Status = GetProcessLuid(NULL, Process, &ProcessLuid);
if (!NT_SUCCESS(Status))
{
ERR("IntResolveDesktop: Failed to retrieve the process LUID, Status 0x%08lx\n", Status);
SetLastNtError(Status);
return Status;
}
/*
* If this process is not the current one, obtain a temporary handle
* to it so that we can perform handles duplication later.
*/
if (Process != PsGetCurrentProcess())
{
Status = ObOpenObjectByPointer(Process,
OBJ_KERNEL_HANDLE,
NULL,
0,
*PsProcessType,
KernelMode,
&hProcess);
if (!NT_SUCCESS(Status))
{
ERR("IntResolveDesktop: Failed to obtain a handle to process 0x%p, Status 0x%08lx\n", Process, Status);
SetLastNtError(Status);
return Status;
}
ASSERT(hProcess);
}
/*
* If no window station has been specified, search the process handle table
* for inherited window station handles, otherwise use a default one.
*/
if (WinStaName.Buffer == NULL)
{
/*
* We want to find a suitable default window station.
* For applications that can be interactive, i.e. that have allowed
* access to the single interactive window station on the system,
* the default window station is 'WinSta0'.
* For applications that cannot be interactive, i.e. that do not have
* access to 'WinSta0' (e.g. non-interactive services), the default
* window station is 'Service-0xXXXX-YYYY$' (created if needed).
* Precedence will however be taken by any inherited window station
* that possesses the required interactivity property.
*/
bUseDefaultWinSta = TRUE;
/*
* Use the default 'WinSta0' window station. Whether we should
* use 'Service-0xXXXX-YYYY$' instead will be determined later.
*/
// RtlInitUnicodeString(&WinStaName, L"WinSta0");
WinStaName = WinSta0Name;
if (ObFindHandleForObject(Process,
NULL,
ExWindowStationObjectType,
NULL,
(PHANDLE)&hWinSta))
{
TRACE("IntResolveDesktop: Inherited window station is: 0x%p\n", hWinSta);
}
}
/*
* If no desktop has been specified, search the process handle table
* for inherited desktop handles, otherwise use the Default desktop.
* Note that the inherited desktop that we may use, may not belong
* to the window station we will connect to.
*/
if (DesktopName.Buffer == NULL)
{
/* Use a default desktop name */
RtlInitUnicodeString(&DesktopName, L"Default");
if (ObFindHandleForObject(Process,
NULL,
ExDesktopObjectType,
NULL,
(PHANDLE)&hDesktop))
{
TRACE("IntResolveDesktop: Inherited desktop is: 0x%p\n", hDesktop);
}
}
/*
* We are going to open either a window station or a desktop.
* Even if this operation is done from kernel-mode, we should
* "emulate" an opening from user-mode (i.e. using an ObjectAttributes
* allocated in user-mode, with AccessMode == UserMode) for the
* Object Manager to perform proper access validation to the
* window station or desktop.
*/
/*
* Estimate the maximum size needed for the window station name
* and desktop name to be given to ObjectAttributes->ObjectName.
*/
StrSize = 0;
/* Window station name */
MemSize = _scwprintf(L"Service-0x%x-%x$", MAXULONG, MAXULONG) * sizeof(WCHAR);
MemSize = gustrWindowStationsDir.Length + sizeof(OBJ_NAME_PATH_SEPARATOR)
+ max(WinStaName.Length, MemSize) + sizeof(UNICODE_NULL);
if (MemSize > MAXUSHORT)
{
ERR("IntResolveDesktop: Window station name length is too long.\n");
Status = STATUS_NAME_TOO_LONG;
goto Quit;
}
StrSize = max(StrSize, (USHORT)MemSize);
/* Desktop name */
MemSize = max(DesktopName.Length + sizeof(UNICODE_NULL), sizeof(L"Default"));
StrSize = max(StrSize, (USHORT)MemSize);
/* Size for the OBJECT_ATTRIBUTES */
MemSize = ALIGN_UP(sizeof(OBJECT_ATTRIBUTES), sizeof(PVOID));
/* Add the string size */
MemSize += ALIGN_UP(sizeof(UNICODE_STRING), sizeof(PVOID));
MemSize += StrSize;
/* Allocate the memory in user-mode */
Status = ZwAllocateVirtualMemory(ZwCurrentProcess(),
(PVOID*)&ObjectAttributes,
0,
&MemSize,
MEM_COMMIT,
PAGE_READWRITE);
if (!NT_SUCCESS(Status))
{
ERR("ZwAllocateVirtualMemory() failed, Status 0x%08lx\n", Status);
goto Quit;
}
ObjectName = (PUNICODE_STRING)((ULONG_PTR)ObjectAttributes +
ALIGN_UP(sizeof(OBJECT_ATTRIBUTES), sizeof(PVOID)));
RtlInitEmptyUnicodeString(ObjectName,
(PWCHAR)((ULONG_PTR)ObjectName +
ALIGN_UP(sizeof(UNICODE_STRING), sizeof(PVOID))),
StrSize);
/* If we got an inherited window station handle, duplicate and use it */
if (hWinSta)
{
ASSERT(bUseDefaultWinSta);
/* Duplicate the handle if it belongs to another process than the current one */
if (Process != PsGetCurrentProcess())
{
ASSERT(hProcess);
Status = ZwDuplicateObject(hProcess,
hWinSta,
ZwCurrentProcess(),
(PHANDLE)&hWinStaDup,
0,
0,
DUPLICATE_SAME_ACCESS);
if (!NT_SUCCESS(Status))
{
ERR("IntResolveDesktop: Failed to duplicate the window station handle, Status 0x%08lx\n", Status);
/* We will use a default window station */
hWinSta = NULL;
}
else
{
hWinSta = hWinStaDup;
}
}
}
/*
* If we have an inherited window station, check whether
* it is interactive and remember that for later.
*/
if (hWinSta)
{
ASSERT(bUseDefaultWinSta);
/* Reference the inherited window station */
Status = ObReferenceObjectByHandle(hWinSta,
0,
ExWindowStationObjectType,
KernelMode,
(PVOID*)&WinStaObject,
NULL);
if (!NT_SUCCESS(Status))
{
ERR("Failed to reference the inherited window station, Status 0x%08lx\n", Status);
/* We will use a default window station */
if (hWinStaDup)
{
ASSERT(hWinSta == hWinStaDup);
ObCloseHandle(hWinStaDup, UserMode);
hWinStaDup = NULL;
}
hWinSta = NULL;
}
else
{
ERR("Process LUID is: 0x%x-%x, inherited window station LUID is: 0x%x-%x\n",
ProcessLuid.HighPart, ProcessLuid.LowPart,
WinStaObject->luidUser.HighPart, WinStaObject->luidUser.LowPart);
/* Check whether this window station is interactive, and remember it for later */
bInteractive = !(WinStaObject->Flags & WSS_NOIO);
/* Dereference the window station */
ObDereferenceObject(WinStaObject);
}
}
/* Build a valid window station name */
Status = RtlStringCbPrintfW(ObjectName->Buffer,
ObjectName->MaximumLength,
L"%wZ\\%wZ",
&gustrWindowStationsDir,
&WinStaName);
if (!NT_SUCCESS(Status))
{
ERR("Impossible to build a valid window station name, Status 0x%08lx\n", Status);
goto Quit;
}
ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));
TRACE("Parsed initial window station: '%wZ'\n", ObjectName);
/* Try to open the window station */
InitializeObjectAttributes(ObjectAttributes,
ObjectName,
OBJ_CASE_INSENSITIVE,
NULL,
NULL);
if (bInherit)
ObjectAttributes->Attributes |= OBJ_INHERIT;
Status = ObOpenObjectByName(ObjectAttributes,
ExWindowStationObjectType,
UserMode,
NULL,
WINSTA_ACCESS_ALL,
NULL,
(PHANDLE)&hTempWinSta);
if (!NT_SUCCESS(Status))
{
ERR("Failed to open the window station '%wZ', Status 0x%08lx\n", ObjectName, Status);
}
else
{
//
// FIXME TODO: Perform a window station access check!!
// If we fail AND bUseDefaultWinSta == FALSE we just quit.
//
/*
* Check whether we are opening the (single) interactive
* window station, and if so, perform an access check.
*/
/* Check whether we are allowed to perform interactions */
if (RtlEqualUnicodeString(&WinStaName, &WinSta0Name, TRUE))
{
LUID SystemLuid = SYSTEM_LUID;
/* Interactive window station: check for user LUID */
WinStaObject = InputWindowStation;
Status = STATUS_ACCESS_DENIED;
// TODO: Check also that we compare wrt. window station WinSta0
// which is the only one that can be interactive on the system.
if (((!bUseDefaultWinSta || bInherit) && RtlEqualLuid(&ProcessLuid, &SystemLuid)) ||
RtlEqualLuid(&ProcessLuid, &WinStaObject->luidUser))
{
/* We are interactive on this window station */
bAccessAllowed = TRUE;
Status = STATUS_SUCCESS;
}
}
else
{
/* Non-interactive window station: we have access since we were able to open it */
bAccessAllowed = TRUE;
Status = STATUS_SUCCESS;
}
}
/* If we failed, bail out if we were not trying to open the default window station */
if (!NT_SUCCESS(Status) && !bUseDefaultWinSta) // if (!bAccessAllowed)
goto Quit;
if (/* bAccessAllowed && */ bInteractive || !bAccessAllowed)
{
/*
* Close WinSta0 if the inherited window station is interactive so that
* we can use it, or we do not have access to the interactive WinSta0.
*/
ObCloseHandle(hTempWinSta, UserMode);
hTempWinSta = NULL;
}
if (bInteractive == bAccessAllowed)
{
/* Keep using the inherited window station */
NOTHING;
}
else // if (bInteractive != bAccessAllowed)
{
/*
* Close the inherited window station, we will either keep using
* the interactive WinSta0, or use Service-0xXXXX-YYYY$.
*/
if (hWinStaDup)
{
ASSERT(hWinSta == hWinStaDup);
ObCloseHandle(hWinStaDup, UserMode);
hWinStaDup = NULL;
}
hWinSta = hTempWinSta; // hTempWinSta is NULL in case bAccessAllowed == FALSE
}
if (bUseDefaultWinSta)
{
if (hWinSta == NULL && !bInteractive)
{
/* Build a valid window station name from the LUID */
Status = RtlStringCbPrintfW(ObjectName->Buffer,
ObjectName->MaximumLength,
L"%wZ\\Service-0x%x-%x$",
&gustrWindowStationsDir,
ProcessLuid.HighPart,
ProcessLuid.LowPart);
if (!NT_SUCCESS(Status))
{
ERR("Impossible to build a valid window station name, Status 0x%08lx\n", Status);
goto Quit;
}
ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));
/*
* Set up a security descriptor for the new service's window station.
* A service has an associated window station and desktop. The newly
* created window station and desktop will get this security descriptor
* if such objects weren't created before.
*/
Status = IntCreateServiceSecurity(&ServiceSD);
if (!NT_SUCCESS(Status))
{
ERR("Failed to create a security descriptor for service window station, Status 0x%08lx\n", Status);
goto Quit;
}
/*
* Create or open the non-interactive window station.
* NOTE: The non-interactive window station handle is never inheritable.
*/
InitializeObjectAttributes(ObjectAttributes,
ObjectName,
OBJ_CASE_INSENSITIVE | OBJ_OPENIF,
NULL,
ServiceSD);
Status = IntCreateWindowStation(&hWinSta,
ObjectAttributes,
UserMode,
KernelMode,
MAXIMUM_ALLOWED,
0, 0, 0, 0, 0);
IntFreeSecurityBuffer(ServiceSD);
if (!NT_SUCCESS(Status))
{
ASSERT(hWinSta == NULL);
ERR("Failed to create or open the non-interactive window station '%wZ', Status 0x%08lx\n",
ObjectName, Status);
goto Quit;
}
//
// FIXME: We might not need to always create or open the "Default"
// desktop on the Service-0xXXXX-YYYY$ window station; we may need
// to use another one....
//
/* Create or open the Default desktop on the window station */
Status = RtlStringCbCopyW(ObjectName->Buffer,
ObjectName->MaximumLength,
L"Default");
if (!NT_SUCCESS(Status))
{
ERR("Impossible to build a valid desktop name, Status 0x%08lx\n", Status);
goto Quit;
}
ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));
/*
* NOTE: The non-interactive desktop handle is never inheritable.
* The security descriptor is inherited from the newly created
* window station for the desktop.
*/
InitializeObjectAttributes(ObjectAttributes,
ObjectName,
OBJ_CASE_INSENSITIVE | OBJ_OPENIF,
hWinSta,
NULL);
Status = IntCreateDesktop(&hDesktop,
ObjectAttributes,
UserMode,
NULL,
NULL,
0,
MAXIMUM_ALLOWED);
if (!NT_SUCCESS(Status))
{
ASSERT(hDesktop == NULL);
ERR("Failed to create or open the desktop '%wZ' on window station 0x%p, Status 0x%08lx\n",
ObjectName, hWinSta, Status);
}
goto Quit;
}
/*
if (hWinSta == NULL)
{
Status = STATUS_UNSUCCESSFUL;
goto Quit;
}
*/
}
/*
* If we got an inherited desktop handle, duplicate and use it,
* otherwise open a new desktop.
*/
if (hDesktop != NULL)
{
/* Duplicate the handle if it belongs to another process than the current one */
if (Process != PsGetCurrentProcess())
{
ASSERT(hProcess);
Status = ZwDuplicateObject(hProcess,
hDesktop,
ZwCurrentProcess(),
(PHANDLE)&hDesktopDup,
0,
0,
DUPLICATE_SAME_ACCESS);
if (!NT_SUCCESS(Status))
{
ERR("IntResolveDesktop: Failed to duplicate the desktop handle, Status 0x%08lx\n", Status);
/* We will use a default desktop */
hDesktop = NULL;
}
else
{
hDesktop = hDesktopDup;
}
}
}
if ((hWinSta != NULL) && (hDesktop == NULL))
{
Status = RtlStringCbCopyNW(ObjectName->Buffer,
ObjectName->MaximumLength,
DesktopName.Buffer,
DesktopName.Length);
if (!NT_SUCCESS(Status))
{
ERR("Impossible to build a valid desktop name, Status 0x%08lx\n", Status);
goto Quit;
}
ObjectName->Length = (USHORT)(wcslen(ObjectName->Buffer) * sizeof(WCHAR));
TRACE("Parsed initial desktop: '%wZ'\n", ObjectName);
/* Open the desktop object */
InitializeObjectAttributes(ObjectAttributes,
ObjectName,
OBJ_CASE_INSENSITIVE,
hWinSta,
NULL);
if (bInherit)
ObjectAttributes->Attributes |= OBJ_INHERIT;
Status = ObOpenObjectByName(ObjectAttributes,
ExDesktopObjectType,
UserMode,
NULL,
DESKTOP_ALL_ACCESS,
NULL,
(PHANDLE)&hDesktop);
if (!NT_SUCCESS(Status))
{
ERR("Failed to open the desktop '%wZ' on window station 0x%p, Status 0x%08lx\n",
ObjectName, hWinSta, Status);
goto Quit;
}
}
Quit:
/* Release the object attributes */
if (ObjectAttributes)
{
MemSize = 0;
ZwFreeVirtualMemory(ZwCurrentProcess(),
(PVOID*)&ObjectAttributes,
&MemSize,
MEM_RELEASE);
}
/* Close the temporary process handle */
if (hProcess) // if (Process != PsGetCurrentProcess())
ObCloseHandle(hProcess, KernelMode);
if (NT_SUCCESS(Status))
{
*phWinSta = hWinSta;
*phDesktop = hDesktop;
return STATUS_SUCCESS;
}
else
{
ERR("IntResolveDesktop(%wZ) failed, Status 0x%08lx\n", DesktopPath, Status);
if (hDesktopDup)
ObCloseHandle(hDesktopDup, UserMode);
if (hWinStaDup)
ObCloseHandle(hWinStaDup, UserMode);
if (hDesktop)
ObCloseHandle(hDesktop, UserMode);
if (hWinSta)
ObCloseHandle(hWinSta, UserMode);
SetLastNtError(Status);
return Status;
}
}
/*
* IntValidateDesktopHandle
*
* Validates the desktop handle.
*
* Remarks
* If the function succeeds, the handle remains referenced. If the
* fucntion fails, last error is set.
*/
NTSTATUS FASTCALL
IntValidateDesktopHandle(
HDESK Desktop,
KPROCESSOR_MODE AccessMode,
ACCESS_MASK DesiredAccess,
PDESKTOP *Object)
{
NTSTATUS Status;
Status = ObReferenceObjectByHandle(Desktop,
DesiredAccess,
ExDesktopObjectType,
AccessMode,
(PVOID*)Object,
NULL);
TRACE("IntValidateDesktopHandle: handle:0x%p obj:0x%p access:0x%x Status:0x%lx\n",
Desktop, *Object, DesiredAccess, Status);
if (!NT_SUCCESS(Status))
SetLastNtError(Status);
return Status;
}
PDESKTOP FASTCALL
IntGetActiveDesktop(VOID)
{
return gpdeskInputDesktop;
}
/*
* Returns or creates a handle to the desktop object
*/
HDESK FASTCALL
IntGetDesktopObjectHandle(PDESKTOP DesktopObject)
{
NTSTATUS Status;
HDESK hDesk;
ASSERT(DesktopObject);
if (!ObFindHandleForObject(PsGetCurrentProcess(),
DesktopObject,
ExDesktopObjectType,
NULL,
(PHANDLE)&hDesk))
{
Status = ObOpenObjectByPointer(DesktopObject,
0,
NULL,
0,
ExDesktopObjectType,
UserMode,
(PHANDLE)&hDesk);
if (!NT_SUCCESS(Status))
{
/* Unable to create a handle */
ERR("Unable to create a desktop handle\n");
return NULL;
}
}
else
{
TRACE("Got handle: 0x%p\n", hDesk);
}
return hDesk;
}
PUSER_MESSAGE_QUEUE FASTCALL
IntGetFocusMessageQueue(VOID)
{
PDESKTOP pdo = IntGetActiveDesktop();
if (!pdo)
{
TRACE("No active desktop\n");
return(NULL);
}
return (PUSER_MESSAGE_QUEUE)pdo->ActiveMessageQueue;
}
VOID FASTCALL
IntSetFocusMessageQueue(PUSER_MESSAGE_QUEUE NewQueue)
{
PUSER_MESSAGE_QUEUE Old;
PDESKTOP pdo = IntGetActiveDesktop();
if (!pdo)
{
TRACE("No active desktop\n");
return;
}
if (NewQueue != NULL)
{
if (NewQueue->Desktop != NULL)
{
TRACE("Message Queue already attached to another desktop!\n");
return;
}
IntReferenceMessageQueue(NewQueue);
(void)InterlockedExchangePointer((PVOID*)&NewQueue->Desktop, pdo);
}
Old = (PUSER_MESSAGE_QUEUE)InterlockedExchangePointer((PVOID*)&pdo->ActiveMessageQueue, NewQueue);
if (Old != NULL)
{
(void)InterlockedExchangePointer((PVOID*)&Old->Desktop, 0);
gpqForegroundPrev = Old;
IntDereferenceMessageQueue(Old);
}
// Only one Q can have active foreground even when there are more than one desktop.
if (NewQueue)
{
gpqForeground = pdo->ActiveMessageQueue;
}
else
{
gpqForeground = NULL;
ERR("ptiLastInput is CLEARED!!\n");
ptiLastInput = NULL; // ReactOS hacks... should check for process death.
}
}
PWND FASTCALL
IntGetThreadDesktopWindow(PTHREADINFO pti)
{
if (!pti) pti = PsGetCurrentThreadWin32Thread();
if (pti->pDeskInfo) return pti->pDeskInfo->spwnd;
return NULL;
}
PWND FASTCALL co_GetDesktopWindow(PWND pWnd)
{
if (pWnd->head.rpdesk &&
pWnd->head.rpdesk->pDeskInfo)
return pWnd->head.rpdesk->pDeskInfo->spwnd;
return NULL;
}
HWND FASTCALL IntGetDesktopWindow(VOID)
{
PDESKTOP pdo = IntGetActiveDesktop();
if (!pdo)
{
TRACE("No active desktop\n");
return NULL;
}
return pdo->DesktopWindow;
}
// Win: _GetDesktopWindow
PWND FASTCALL UserGetDesktopWindow(VOID)
{
PDESKTOP pdo = IntGetActiveDesktop();
if (!pdo)
{
TRACE("No active desktop\n");
return NULL;
}
// return pdo->pDeskInfo->spwnd;
return UserGetWindowObject(pdo->DesktopWindow);
}
HWND FASTCALL IntGetMessageWindow(VOID)
{
PDESKTOP pdo = IntGetActiveDesktop();
if (!pdo)
{
TRACE("No active desktop\n");
return NULL;
}
return pdo->spwndMessage->head.h;
}
// Win: _GetMessageWindow
PWND FASTCALL UserGetMessageWindow(VOID)
{
PDESKTOP pdo = IntGetActiveDesktop();
if (!pdo)
{
TRACE("No active desktop\n");
return NULL;
}
return pdo->spwndMessage;
}
HWND FASTCALL IntGetCurrentThreadDesktopWindow(VOID)
{
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
PDESKTOP pdo = pti->rpdesk;
if (NULL == pdo)
{
ERR("Thread doesn't have a desktop\n");
return NULL;
}
return pdo->DesktopWindow;
}
/* PUBLIC FUNCTIONS ***********************************************************/
BOOL FASTCALL
DesktopWindowProc(PWND Wnd, UINT Msg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
{
PAINTSTRUCT Ps;
ULONG Value;
//ERR("DesktopWindowProc\n");
*lResult = 0;
switch (Msg)
{
case WM_NCCREATE:
if (!Wnd->fnid)
{
Wnd->fnid = FNID_DESKTOP;
}
*lResult = (LRESULT)TRUE;
return TRUE;
case WM_CREATE:
Value = HandleToULong(PsGetCurrentProcessId());
// Save Process ID
co_UserSetWindowLong(UserHMGetHandle(Wnd), DT_GWL_PROCESSID, Value, FALSE);
Value = HandleToULong(PsGetCurrentThreadId());
// Save Thread ID
co_UserSetWindowLong(UserHMGetHandle(Wnd), DT_GWL_THREADID, Value, FALSE);
case WM_CLOSE:
return TRUE;
case WM_DISPLAYCHANGE:
co_WinPosSetWindowPos(Wnd, 0, 0, 0, LOWORD(lParam), HIWORD(lParam), SWP_NOZORDER | SWP_NOACTIVATE);
return TRUE;
case WM_ERASEBKGND:
IntPaintDesktop((HDC)wParam);
*lResult = 1;
return TRUE;
case WM_PAINT:
{
if (IntBeginPaint(Wnd, &Ps))
{
IntEndPaint(Wnd, &Ps);
}
return TRUE;
}
case WM_SYSCOLORCHANGE:
co_UserRedrawWindow(Wnd, NULL, NULL, RDW_INVALIDATE|RDW_ERASE|RDW_ALLCHILDREN);
return TRUE;
case WM_SETCURSOR:
{
PCURICON_OBJECT pcurOld, pcurNew;
pcurNew = UserGetCurIconObject(gDesktopCursor);
if (!pcurNew)
{
return TRUE;
}
pcurNew->CURSORF_flags |= CURSORF_CURRENT;
pcurOld = UserSetCursor(pcurNew, FALSE);
if (pcurOld)
{
pcurOld->CURSORF_flags &= ~CURSORF_CURRENT;
UserDereferenceObject(pcurOld);
}
return TRUE;
}
case WM_WINDOWPOSCHANGING:
{
PWINDOWPOS pWindowPos = (PWINDOWPOS)lParam;
if ((pWindowPos->flags & SWP_SHOWWINDOW) != 0)
{
HDESK hdesk = UserOpenInputDesktop(0, FALSE, DESKTOP_ALL_ACCESS);
IntSetThreadDesktop(hdesk, FALSE);
}
break;
}
default:
TRACE("DWP calling IDWP Msg %d\n",Msg);
//*lResult = IntDefWindowProc(Wnd, Msg, wParam, lParam, FALSE);
}
return TRUE; /* We are done. Do not do any callbacks to user mode */
}
BOOL FASTCALL
UserMessageWindowProc(PWND pwnd, UINT Msg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
{
*lResult = 0;
switch(Msg)
{
case WM_NCCREATE:
pwnd->fnid |= FNID_MESSAGEWND;
*lResult = (LRESULT)TRUE;
break;
case WM_DESTROY:
pwnd->fnid |= FNID_DESTROY;
break;
default:
ERR("UMWP calling IDWP\n");
*lResult = IntDefWindowProc(pwnd, Msg, wParam, lParam, FALSE);
}
return TRUE; /* We are done. Do not do any callbacks to user mode */
}
VOID NTAPI DesktopThreadMain(VOID)
{
BOOL Ret;
MSG Msg;
gptiDesktopThread = PsGetCurrentThreadWin32Thread();
UserEnterExclusive();
/* Register system classes. This thread does not belong to any desktop so the
classes will be allocated from the shared heap */
UserRegisterSystemClasses();
KeSetEvent(gpDesktopThreadStartedEvent, IO_NO_INCREMENT, FALSE);
while (TRUE)
{
Ret = co_IntGetPeekMessage(&Msg, 0, 0, 0, PM_REMOVE, TRUE);
if (Ret)
{
IntDispatchMessage(&Msg);
}
}
UserLeave();
}
HDC FASTCALL
UserGetDesktopDC(ULONG DcType, BOOL bAltDc, BOOL ValidatehWnd)
{
PWND DesktopObject = 0;
HDC DesktopHDC = 0;
/* This can be called from GDI/DX, so acquire the USER lock */
UserEnterExclusive();
if (DcType == DCTYPE_DIRECT)
{
DesktopObject = UserGetDesktopWindow();
DesktopHDC = (HDC)UserGetWindowDC(DesktopObject);
}
else
{
PMONITOR pMonitor = UserGetPrimaryMonitor();
DesktopHDC = IntGdiCreateDisplayDC(pMonitor->hDev, DcType, bAltDc);
}
UserLeave();
return DesktopHDC;
}
VOID APIENTRY
UserRedrawDesktop(VOID)
{
PWND Window = NULL;
PREGION Rgn;
Window = UserGetDesktopWindow();
Rgn = IntSysCreateRectpRgnIndirect(&Window->rcWindow);
IntInvalidateWindows(Window,
Rgn,
RDW_FRAME | RDW_ERASE |
RDW_INVALIDATE | RDW_ALLCHILDREN);
REGION_Delete(Rgn);
}
NTSTATUS FASTCALL
co_IntShowDesktop(PDESKTOP Desktop, ULONG Width, ULONG Height, BOOL bRedraw)
{
PWND pwnd = Desktop->pDeskInfo->spwnd;
UINT flags = SWP_NOACTIVATE|SWP_NOZORDER|SWP_SHOWWINDOW;
ASSERT(pwnd);
if (!bRedraw)
flags |= SWP_NOREDRAW;
co_WinPosSetWindowPos(pwnd, NULL, 0, 0, Width, Height, flags);
if (bRedraw)
co_UserRedrawWindow( pwnd, NULL, 0, RDW_UPDATENOW | RDW_ALLCHILDREN | RDW_INVALIDATE );
return STATUS_SUCCESS;
}
NTSTATUS FASTCALL
IntHideDesktop(PDESKTOP Desktop)
{
PWND DesktopWnd;
DesktopWnd = IntGetWindowObject(Desktop->DesktopWindow);
if (! DesktopWnd)
{
return ERROR_INVALID_WINDOW_HANDLE;
}
DesktopWnd->style &= ~WS_VISIBLE;
return STATUS_SUCCESS;
}
static
HWND* FASTCALL
UserBuildShellHookHwndList(PDESKTOP Desktop)
{
ULONG entries=0;
PLIST_ENTRY ListEntry;
PSHELL_HOOK_WINDOW Current;
HWND* list;
/* FIXME: If we save nb elements in desktop, we don't have to loop to find nb entries */
ListEntry = Desktop->ShellHookWindows.Flink;
while (ListEntry != &Desktop->ShellHookWindows)
{
ListEntry = ListEntry->Flink;
entries++;
}
if (!entries) return NULL;
list = ExAllocatePoolWithTag(PagedPool, sizeof(HWND) * (entries + 1), USERTAG_WINDOWLIST); /* alloc one extra for nullterm */
if (list)
{
HWND* cursor = list;
ListEntry = Desktop->ShellHookWindows.Flink;
while (ListEntry != &Desktop->ShellHookWindows)
{
Current = CONTAINING_RECORD(ListEntry, SHELL_HOOK_WINDOW, ListEntry);
ListEntry = ListEntry->Flink;
*cursor++ = Current->hWnd;
}
*cursor = NULL; /* Nullterm list */
}
return list;
}
/*
* Send the Message to the windows registered for ShellHook
* notifications. The lParam contents depend on the Message. See
* MSDN for more details (RegisterShellHookWindow)
*/
VOID co_IntShellHookNotify(WPARAM Message, WPARAM wParam, LPARAM lParam)
{
PDESKTOP Desktop = IntGetActiveDesktop();
HWND* HwndList;
if (!gpsi->uiShellMsg)
{
gpsi->uiShellMsg = IntAddAtom(L"SHELLHOOK");
TRACE("MsgType = %x\n", gpsi->uiShellMsg);
if (!gpsi->uiShellMsg)
ERR("LastError: %x\n", EngGetLastError());
}
if (!Desktop)
{
TRACE("IntShellHookNotify: No desktop!\n");
return;
}
// Allow other devices have a shot at foreground.
if (Message == HSHELL_APPCOMMAND) ptiLastInput = NULL;
// FIXME: System Tray Support.
HwndList = UserBuildShellHookHwndList(Desktop);
if (HwndList)
{
HWND* cursor = HwndList;
for (; *cursor; cursor++)
{
TRACE("Sending notify\n");
UserPostMessage(*cursor,
gpsi->uiShellMsg,
Message,
(Message == HSHELL_LANGUAGE ? lParam : (LPARAM)wParam) );
/* co_IntPostOrSendMessage(*cursor,
gpsi->uiShellMsg,
Message,
(Message == HSHELL_LANGUAGE ? lParam : (LPARAM)wParam) );*/
}
ExFreePoolWithTag(HwndList, USERTAG_WINDOWLIST);
}
if (ISITHOOKED(WH_SHELL))
{
co_HOOK_CallHooks(WH_SHELL, Message, wParam, lParam);
}
}
/*
* Add the window to the ShellHookWindows list. The windows
* on that list get notifications that are important to shell
* type applications.
*
* TODO: Validate the window? I'm not sure if sending these messages to
* an unsuspecting application that is not your own is a nice thing to do.
*/
BOOL IntRegisterShellHookWindow(HWND hWnd)
{
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
PDESKTOP Desktop = pti->rpdesk;
PSHELL_HOOK_WINDOW Entry;
TRACE("IntRegisterShellHookWindow\n");
/* First deregister the window, so we can be sure it's never twice in the
* list.
*/
IntDeRegisterShellHookWindow(hWnd);
Entry = ExAllocatePoolWithTag(PagedPool,
sizeof(SHELL_HOOK_WINDOW),
TAG_WINSTA);
if (!Entry)
return FALSE;
Entry->hWnd = hWnd;
InsertTailList(&Desktop->ShellHookWindows, &Entry->ListEntry);
return TRUE;
}
/*
* Remove the window from the ShellHookWindows list. The windows
* on that list get notifications that are important to shell
* type applications.
*/
BOOL IntDeRegisterShellHookWindow(HWND hWnd)
{
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
PDESKTOP Desktop = pti->rpdesk;
PLIST_ENTRY ListEntry;
PSHELL_HOOK_WINDOW Current;
// FIXME: This probably shouldn't happen, but it does
if (Desktop == NULL)
{
Desktop = IntGetActiveDesktop();
if (Desktop == NULL)
return FALSE;
}
ListEntry = Desktop->ShellHookWindows.Flink;
while (ListEntry != &Desktop->ShellHookWindows)
{
Current = CONTAINING_RECORD(ListEntry, SHELL_HOOK_WINDOW, ListEntry);
ListEntry = ListEntry->Flink;
if (Current->hWnd == hWnd)
{
RemoveEntryList(&Current->ListEntry);
ExFreePoolWithTag(Current, TAG_WINSTA);
return TRUE;
}
}
return FALSE;
}
static VOID
IntFreeDesktopHeap(IN OUT PDESKTOP Desktop)
{
/* FIXME: Disable until unmapping works in mm */
#if 0
if (Desktop->pheapDesktop != NULL)
{
MmUnmapViewInSessionSpace(Desktop->pheapDesktop);
Desktop->pheapDesktop = NULL;
}
if (Desktop->hsectionDesktop != NULL)
{
ObDereferenceObject(Desktop->hsectionDesktop);
Desktop->hsectionDesktop = NULL;
}
#endif
}
BOOL FASTCALL
IntPaintDesktop(HDC hDC)
{
static WCHAR s_wszSafeMode[] = L"Safe Mode"; // FIXME: Localize!
RECTL Rect;
HBRUSH DesktopBrush, PreviousBrush;
HWND hWndDesktop;
BOOL doPatBlt = TRUE;
PWND WndDesktop;
BOOLEAN InSafeMode;
if (GdiGetClipBox(hDC, &Rect) == ERROR)
return FALSE;
hWndDesktop = IntGetDesktopWindow(); // rpdesk->DesktopWindow;
WndDesktop = UserGetWindowObject(hWndDesktop); // rpdesk->pDeskInfo->spwnd;
if (!WndDesktop)
return FALSE;
/* Retrieve the current SafeMode state */
InSafeMode = (UserGetSystemMetrics(SM_CLEANBOOT) != 0); // gpsi->aiSysMet[SM_CLEANBOOT];
if (!InSafeMode)
{
DesktopBrush = (HBRUSH)WndDesktop->pcls->hbrBackground;
/*
* Paint desktop background
*/
if (gspv.hbmWallpaper != NULL)
{
SIZE sz;
int x, y;
int scaledWidth, scaledHeight;
int wallpaperX, wallpaperY, wallpaperWidth, wallpaperHeight;
HDC hWallpaperDC;
sz.cx = WndDesktop->rcWindow.right - WndDesktop->rcWindow.left;
sz.cy = WndDesktop->rcWindow.bottom - WndDesktop->rcWindow.top;
if (gspv.WallpaperMode == wmFit ||
gspv.WallpaperMode == wmFill)
{
int scaleNum, scaleDen;
// Precision improvement over ((sz.cx / gspv.cxWallpaper) > (sz.cy / gspv.cyWallpaper))
if ((sz.cx * gspv.cyWallpaper) > (sz.cy * gspv.cxWallpaper))
{
if (gspv.WallpaperMode == wmFit)
{
scaleNum = sz.cy;
scaleDen = gspv.cyWallpaper;
}
else
{
scaleNum = sz.cx;
scaleDen = gspv.cxWallpaper;
}
}
else
{
if (gspv.WallpaperMode == wmFit)
{
scaleNum = sz.cx;
scaleDen = gspv.cxWallpaper;
}
else
{
scaleNum = sz.cy;
scaleDen = gspv.cyWallpaper;
}
}
scaledWidth = EngMulDiv(gspv.cxWallpaper, scaleNum, scaleDen);
scaledHeight = EngMulDiv(gspv.cyWallpaper, scaleNum, scaleDen);
if (gspv.WallpaperMode == wmFill)
{
wallpaperX = (((scaledWidth - sz.cx) * gspv.cxWallpaper) / (2 * scaledWidth));
wallpaperY = (((scaledHeight - sz.cy) * gspv.cyWallpaper) / (2 * scaledHeight));
wallpaperWidth = (sz.cx * gspv.cxWallpaper) / scaledWidth;
wallpaperHeight = (sz.cy * gspv.cyWallpaper) / scaledHeight;
}
}
if (gspv.WallpaperMode == wmStretch ||
gspv.WallpaperMode == wmTile ||
gspv.WallpaperMode == wmFill)
{
x = 0;
y = 0;
}
else if (gspv.WallpaperMode == wmFit)
{
x = (sz.cx - scaledWidth) / 2;
y = (sz.cy - scaledHeight) / 2;
}
else
{
/* Find the upper left corner, can be negative if the bitmap is bigger than the screen */
x = (sz.cx / 2) - (gspv.cxWallpaper / 2);
y = (sz.cy / 2) - (gspv.cyWallpaper / 2);
}
hWallpaperDC = NtGdiCreateCompatibleDC(hDC);
if (hWallpaperDC != NULL)
{
HBITMAP hOldBitmap;
/* Fill in the area that the bitmap is not going to cover */
if (x > 0 || y > 0)
{
/* FIXME: Clip out the bitmap
can be replaced with "NtGdiPatBlt(hDC, x, y, gspv.cxWallpaper, gspv.cyWallpaper, PATCOPY | DSTINVERT);"
once we support DSTINVERT */
PreviousBrush = NtGdiSelectBrush(hDC, DesktopBrush);
NtGdiPatBlt(hDC, Rect.left, Rect.top, Rect.right, Rect.bottom, PATCOPY);
NtGdiSelectBrush(hDC, PreviousBrush);
}
/* Do not fill the background after it is painted no matter the size of the picture */
doPatBlt = FALSE;
hOldBitmap = NtGdiSelectBitmap(hWallpaperDC, gspv.hbmWallpaper);
if (gspv.WallpaperMode == wmStretch)
{
if (Rect.right && Rect.bottom)
NtGdiStretchBlt(hDC,
x,
y,
sz.cx,
sz.cy,
hWallpaperDC,
0,
0,
gspv.cxWallpaper,
gspv.cyWallpaper,
SRCCOPY,
0);
}
else if (gspv.WallpaperMode == wmTile)
{
/* Paint the bitmap across the screen then down */
for (y = 0; y < Rect.bottom; y += gspv.cyWallpaper)
{
for (x = 0; x < Rect.right; x += gspv.cxWallpaper)
{
NtGdiBitBlt(hDC,
x,
y,
gspv.cxWallpaper,
gspv.cyWallpaper,
hWallpaperDC,
0,
0,
SRCCOPY,
0,
0);
}
}
}
else if (gspv.WallpaperMode == wmFit)
{
if (Rect.right && Rect.bottom)
{
NtGdiStretchBlt(hDC,
x,
y,
scaledWidth,
scaledHeight,
hWallpaperDC,
0,
0,
gspv.cxWallpaper,
gspv.cyWallpaper,
SRCCOPY,
0);
}
}
else if (gspv.WallpaperMode == wmFill)
{
if (Rect.right && Rect.bottom)
{
NtGdiStretchBlt(hDC,
x,
y,
sz.cx,
sz.cy,
hWallpaperDC,
wallpaperX,
wallpaperY,
wallpaperWidth,
wallpaperHeight,
SRCCOPY,
0);
}
}
else
{
NtGdiBitBlt(hDC,
x,
y,
gspv.cxWallpaper,
gspv.cyWallpaper,
hWallpaperDC,
0,
0,
SRCCOPY,
0,
0);
}
NtGdiSelectBitmap(hWallpaperDC, hOldBitmap);
NtGdiDeleteObjectApp(hWallpaperDC);
}
}
}
else
{
/* Black desktop background in Safe Mode */
DesktopBrush = StockObjects[BLACK_BRUSH];
}
/* Background is set to none, clear the screen */
if (doPatBlt)
{
PreviousBrush = NtGdiSelectBrush(hDC, DesktopBrush);
NtGdiPatBlt(hDC, Rect.left, Rect.top, Rect.right, Rect.bottom, PATCOPY);
NtGdiSelectBrush(hDC, PreviousBrush);
}
/*
* Display the system version on the desktop background
*/
if (InSafeMode || g_AlwaysDisplayVersion || g_PaintDesktopVersion)
{
NTSTATUS Status;
static WCHAR wszzVersion[1024] = L"\0";
/* Only used in normal mode */
// We expect at most 4 strings (3 for version, 1 for optional NtSystemRoot)
static POLYTEXTW VerStrs[4] = {{0},{0},{0},{0}};
INT i = 0;
SIZE_T len;
HFONT hFont1 = NULL, hFont2 = NULL, hOldFont = NULL;
COLORREF crText, color_old;
UINT align_old;
INT mode_old;
PDC pdc;
if (!UserSystemParametersInfo(SPI_GETWORKAREA, 0, &Rect, 0))
{
Rect.left = Rect.top = 0;
Rect.right = UserGetSystemMetrics(SM_CXSCREEN);
Rect.bottom = UserGetSystemMetrics(SM_CYSCREEN);
}
else
{
RECTL_vOffsetRect(&Rect, -Rect.left, -Rect.top);
}
/*
* Set up the fonts (otherwise use default ones)
*/
/* Font for the principal version string */
hFont1 = GreCreateFontIndirectW(&gspv.ncm.lfCaptionFont);
/* Font for the secondary version strings */
hFont2 = GreCreateFontIndirectW(&gspv.ncm.lfMenuFont);
if (hFont1)
hOldFont = NtGdiSelectFont(hDC, hFont1);
if (gspv.hbmWallpaper == NULL)
{
/* Retrieve the brush fill colour */
// TODO: The following code constitutes "GreGetBrushColor".
PreviousBrush = NtGdiSelectBrush(hDC, DesktopBrush);
pdc = DC_LockDc(hDC);
if (pdc)
{
crText = pdc->eboFill.ulRGBColor;
DC_UnlockDc(pdc);
}
else
{
crText = RGB(0, 0, 0);
}
NtGdiSelectBrush(hDC, PreviousBrush);
/* Adjust text colour according to the brush */
if (GetRValue(crText) + GetGValue(crText) + GetBValue(crText) > 128 * 3)
crText = RGB(0, 0, 0);
else
crText = RGB(255, 255, 255);
}
else
{
/* Always use white when the text is displayed on top of a wallpaper */
crText = RGB(255, 255, 255);
}
color_old = IntGdiSetTextColor(hDC, crText);
align_old = IntGdiSetTextAlign(hDC, TA_RIGHT);
mode_old = IntGdiSetBkMode(hDC, TRANSPARENT);
/* Display the system version information */
if (!*wszzVersion)
{
Status = GetSystemVersionString(wszzVersion,
ARRAYSIZE(wszzVersion),
InSafeMode,
g_AlwaysDisplayVersion);
if (!InSafeMode && NT_SUCCESS(Status) && *wszzVersion)
{
PWCHAR pstr = wszzVersion;
for (i = 0; (i < ARRAYSIZE(VerStrs)) && *pstr; ++i)
{
VerStrs[i].n = lstrlenW(pstr);
VerStrs[i].lpstr = pstr;
pstr += (VerStrs[i].n + 1);
}
}
}
else
{
Status = STATUS_SUCCESS;
}
if (NT_SUCCESS(Status) && *wszzVersion)
{
if (!InSafeMode)
{
SIZE Size = {0, 0};
LONG TotalHeight = 0;
/* Normal Mode: multiple version information text separated by newlines */
IntGdiSetTextAlign(hDC, TA_RIGHT | TA_BOTTOM);
/* Compute the heights of the strings */
if (hFont1) NtGdiSelectFont(hDC, hFont1);
for (i = 0; i < ARRAYSIZE(VerStrs); ++i)
{
if (!VerStrs[i].lpstr || !*VerStrs[i].lpstr || (VerStrs[i].n == 0))
break;
GreGetTextExtentW(hDC, VerStrs[i].lpstr, VerStrs[i].n, &Size, 1);
VerStrs[i].y = Size.cy; // Store the string height
TotalHeight += Size.cy;
/* While the first string was using hFont1, all the others use hFont2 */
if (hFont2) NtGdiSelectFont(hDC, hFont2);
}
/* The total height must not exceed the screen height */
TotalHeight = min(TotalHeight, Rect.bottom);
/* Display the strings */
if (hFont1) NtGdiSelectFont(hDC, hFont1);
for (i = 0; i < ARRAYSIZE(VerStrs); ++i)
{
if (!VerStrs[i].lpstr || !*VerStrs[i].lpstr || (VerStrs[i].n == 0))
break;
TotalHeight -= VerStrs[i].y;
GreExtTextOutW(hDC,
Rect.right - 5,
Rect.bottom - TotalHeight - 5,
0, NULL,
VerStrs[i].lpstr,
VerStrs[i].n,
NULL, 0);
/* While the first string was using hFont1, all the others use hFont2 */
if (hFont2) NtGdiSelectFont(hDC, hFont2);
}
}
else
{
if (hFont1) NtGdiSelectFont(hDC, hFont1);
/* Safe Mode: single version information text in top center */
len = wcslen(wszzVersion);
IntGdiSetTextAlign(hDC, TA_CENTER | TA_TOP);
GreExtTextOutW(hDC, (Rect.right + Rect.left)/2, Rect.top + 3, 0, NULL, wszzVersion, len, NULL, 0);
}
}
if (InSafeMode)
{
if (hFont1) NtGdiSelectFont(hDC, hFont1);
/* Print Safe Mode text in corners */
len = wcslen(s_wszSafeMode);
IntGdiSetTextAlign(hDC, TA_LEFT | TA_TOP);
GreExtTextOutW(hDC, Rect.left, Rect.top + 3, 0, NULL, s_wszSafeMode, len, NULL, 0);
IntGdiSetTextAlign(hDC, TA_RIGHT | TA_TOP);
GreExtTextOutW(hDC, Rect.right, Rect.top + 3, 0, NULL, s_wszSafeMode, len, NULL, 0);
IntGdiSetTextAlign(hDC, TA_LEFT | TA_BOTTOM);
GreExtTextOutW(hDC, Rect.left, Rect.bottom - 5, 0, NULL, s_wszSafeMode, len, NULL, 0);
IntGdiSetTextAlign(hDC, TA_RIGHT | TA_BOTTOM);
GreExtTextOutW(hDC, Rect.right, Rect.bottom - 5, 0, NULL, s_wszSafeMode, len, NULL, 0);
}
IntGdiSetBkMode(hDC, mode_old);
IntGdiSetTextAlign(hDC, align_old);
IntGdiSetTextColor(hDC, color_old);
if (hFont2)
GreDeleteObject(hFont2);
if (hFont1)
{
NtGdiSelectFont(hDC, hOldFont);
GreDeleteObject(hFont1);
}
}
return TRUE;
}
static NTSTATUS
UserInitializeDesktop(PDESKTOP pdesk, PUNICODE_STRING DesktopName, PWINSTATION_OBJECT pwinsta)
{
PVOID DesktopHeapSystemBase = NULL;
ULONG_PTR HeapSize = gdwDesktopSectionSize * 1024;
SIZE_T DesktopInfoSize;
ULONG i;
TRACE("UserInitializeDesktop desktop 0x%p with name %wZ\n", pdesk, DesktopName);
RtlZeroMemory(pdesk, sizeof(DESKTOP));
/* Link the desktop with the parent window station */
ObReferenceObject(pwinsta);
pdesk->rpwinstaParent = pwinsta;
InsertTailList(&pwinsta->DesktopListHead, &pdesk->ListEntry);
/* Create the desktop heap */
pdesk->hsectionDesktop = NULL;
pdesk->pheapDesktop = UserCreateHeap(&pdesk->hsectionDesktop,
&DesktopHeapSystemBase,
HeapSize);
if (pdesk->pheapDesktop == NULL)
{
ERR("Failed to create desktop heap!\n");
return STATUS_NO_MEMORY;
}
/* Create DESKTOPINFO */
DesktopInfoSize = sizeof(DESKTOPINFO) + DesktopName->Length + sizeof(WCHAR);
pdesk->pDeskInfo = RtlAllocateHeap(pdesk->pheapDesktop,
HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY,
DesktopInfoSize);
if (pdesk->pDeskInfo == NULL)
{
ERR("Failed to create the DESKTOP structure!\n");
return STATUS_NO_MEMORY;
}
/* Initialize the DESKTOPINFO */
pdesk->pDeskInfo->pvDesktopBase = DesktopHeapSystemBase;
pdesk->pDeskInfo->pvDesktopLimit = (PVOID)((ULONG_PTR)DesktopHeapSystemBase + HeapSize);
RtlCopyMemory(pdesk->pDeskInfo->szDesktopName,
DesktopName->Buffer,
DesktopName->Length + sizeof(WCHAR));
for (i = 0; i < NB_HOOKS; i++)
{
InitializeListHead(&pdesk->pDeskInfo->aphkStart[i]);
}
InitializeListHead(&pdesk->ShellHookWindows);
InitializeListHead(&pdesk->PtiList);
return STATUS_SUCCESS;
}
/* SYSCALLS *******************************************************************/
/*
* NtUserCreateDesktop
*
* Creates a new desktop.
*
* Parameters
* poaAttribs
* Object Attributes.
*
* lpszDesktopDevice
* Name of the device.
*
* pDeviceMode
* Device Mode.
*
* dwFlags
* Interaction flags.
*
* dwDesiredAccess
* Requested type of access.
*
*
* Return Value
* If the function succeeds, the return value is a handle to the newly
* created desktop. If the specified desktop already exists, the function
* succeeds and returns a handle to the existing desktop. When you are
* finished using the handle, call the CloseDesktop function to close it.
* If the function fails, the return value is NULL.
*
* Status
* @implemented
*/
NTSTATUS
FASTCALL
IntCreateDesktop(
OUT HDESK* phDesktop,
IN POBJECT_ATTRIBUTES ObjectAttributes,
IN KPROCESSOR_MODE AccessMode,
IN PUNICODE_STRING lpszDesktopDevice OPTIONAL,
IN LPDEVMODEW lpdmw OPTIONAL,
IN DWORD dwFlags,
IN ACCESS_MASK dwDesiredAccess)
{
NTSTATUS Status;
PDESKTOP pdesk = NULL;
HDESK hDesk;
BOOLEAN Context = FALSE;
UNICODE_STRING ClassName;
LARGE_STRING WindowName;
BOOL NoHooks = FALSE;
PWND pWnd = NULL;
CREATESTRUCTW Cs;
PTHREADINFO ptiCurrent;
PCLS pcls;
TRACE("Enter IntCreateDesktop\n");
ASSERT(UserIsEnteredExclusive());
ASSERT(phDesktop);
*phDesktop = NULL;
ptiCurrent = PsGetCurrentThreadWin32Thread();
ASSERT(ptiCurrent);
ASSERT(gptiDesktopThread);
/* Turn off hooks when calling any CreateWindowEx from inside win32k */
NoHooks = (ptiCurrent->TIF_flags & TIF_DISABLEHOOKS);
ptiCurrent->TIF_flags |= TIF_DISABLEHOOKS;
ptiCurrent->pClientInfo->dwTIFlags = ptiCurrent->TIF_flags;
/*
* Try to open already existing desktop
*/
Status = ObOpenObjectByName(ObjectAttributes,
ExDesktopObjectType,
AccessMode,
NULL,
dwDesiredAccess,
(PVOID)&Context,
(PHANDLE)&hDesk);
if (!NT_SUCCESS(Status))
{
ERR("ObOpenObjectByName failed to open/create desktop\n");
goto Quit;
}
/* In case the object was not created (eg if it existed), return now */
if (Context == FALSE)
{
TRACE("IntCreateDesktop opened desktop '%wZ'\n", ObjectAttributes->ObjectName);
Status = STATUS_SUCCESS;
goto Quit;
}
/* Reference the desktop */
Status = ObReferenceObjectByHandle(hDesk,
0,
ExDesktopObjectType,
KernelMode,
(PVOID*)&pdesk,
NULL);
if (!NT_SUCCESS(Status))
{
ERR("Failed to reference desktop object\n");
goto Quit;
}
/* Get the desktop window class. The thread desktop does not belong to any desktop
* so the classes created there (including the desktop class) are allocated in the shared heap
* It would cause problems if we used a class that belongs to the caller
*/
ClassName.Buffer = WC_DESKTOP;
ClassName.Length = 0;
pcls = IntGetAndReferenceClass(&ClassName, 0, TRUE);
if (pcls == NULL)
{
ASSERT(FALSE);
Status = STATUS_UNSUCCESSFUL;
goto Quit;
}
RtlZeroMemory(&WindowName, sizeof(WindowName));
RtlZeroMemory(&Cs, sizeof(Cs));
Cs.x = UserGetSystemMetrics(SM_XVIRTUALSCREEN),
Cs.y = UserGetSystemMetrics(SM_YVIRTUALSCREEN),
Cs.cx = UserGetSystemMetrics(SM_CXVIRTUALSCREEN),
Cs.cy = UserGetSystemMetrics(SM_CYVIRTUALSCREEN),
Cs.style = WS_POPUP|WS_CLIPCHILDREN;
Cs.hInstance = hModClient; // hModuleWin; // Server side winproc!
Cs.lpszName = (LPCWSTR) &WindowName;
Cs.lpszClass = (LPCWSTR) &ClassName;
/* Use IntCreateWindow instead of co_UserCreateWindowEx because the later expects a thread with a desktop */
pWnd = IntCreateWindow(&Cs, &WindowName, pcls, NULL, NULL, NULL, pdesk, WINVER);
if (pWnd == NULL)
{
ERR("Failed to create desktop window for the new desktop\n");
Status = STATUS_UNSUCCESSFUL;
goto Quit;
}
pdesk->dwSessionId = PsGetCurrentProcessSessionId();
pdesk->DesktopWindow = pWnd->head.h;
pdesk->pDeskInfo->spwnd = pWnd;
pWnd->fnid = FNID_DESKTOP;
ClassName.Buffer = MAKEINTATOM(gpsi->atomSysClass[ICLS_HWNDMESSAGE]);
ClassName.Length = 0;
pcls = IntGetAndReferenceClass(&ClassName, 0, TRUE);
if (pcls == NULL)
{
ASSERT(FALSE);
Status = STATUS_UNSUCCESSFUL;
goto Quit;
}
RtlZeroMemory(&WindowName, sizeof(WindowName));
RtlZeroMemory(&Cs, sizeof(Cs));
Cs.cx = Cs.cy = 100;
Cs.style = WS_POPUP|WS_CLIPCHILDREN;
Cs.hInstance = hModClient; // hModuleWin; // Server side winproc!
Cs.lpszName = (LPCWSTR)&WindowName;
Cs.lpszClass = (LPCWSTR)&ClassName;
pWnd = IntCreateWindow(&Cs, &WindowName, pcls, NULL, NULL, NULL, pdesk, WINVER);
if (pWnd == NULL)
{
ERR("Failed to create message window for the new desktop\n");
Status = STATUS_UNSUCCESSFUL;
goto Quit;
}
pdesk->spwndMessage = pWnd;
pWnd->fnid = FNID_MESSAGEWND;
/* Now...
if !(WinStaObject->Flags & WSF_NOIO) is (not set) for desktop input output mode (see wiki)
Create Tooltip. Saved in DesktopObject->spwndTooltip.
Tooltip dwExStyle: WS_EX_TOOLWINDOW|WS_EX_TOPMOST
hWndParent are spwndMessage. Use hModuleWin for server side winproc!
The rest is same as message window.
http://msdn.microsoft.com/en-us/library/bb760250(VS.85).aspx
*/
Status = STATUS_SUCCESS;
Quit:
if (pdesk != NULL)
{
ObDereferenceObject(pdesk);
}
if (!NT_SUCCESS(Status) && hDesk != NULL)
{
ObCloseHandle(hDesk, AccessMode);
hDesk = NULL;
}
if (!NoHooks)
{
ptiCurrent->TIF_flags &= ~TIF_DISABLEHOOKS;
ptiCurrent->pClientInfo->dwTIFlags = ptiCurrent->TIF_flags;
}
TRACE("Leave IntCreateDesktop, Status 0x%08lx\n", Status);
if (NT_SUCCESS(Status))
*phDesktop = hDesk;
else
SetLastNtError(Status);
return Status;
}
HDESK APIENTRY
NtUserCreateDesktop(
POBJECT_ATTRIBUTES ObjectAttributes,
PUNICODE_STRING lpszDesktopDevice,
LPDEVMODEW lpdmw,
DWORD dwFlags,
ACCESS_MASK dwDesiredAccess)
{
NTSTATUS Status;
HDESK hDesk;
DECLARE_RETURN(HDESK);
TRACE("Enter NtUserCreateDesktop\n");
UserEnterExclusive();
Status = IntCreateDesktop(&hDesk,
ObjectAttributes,
UserMode,
lpszDesktopDevice,
lpdmw,
dwFlags,
dwDesiredAccess);
if (!NT_SUCCESS(Status))
{
ERR("IntCreateDesktop failed, Status 0x%08lx\n", Status);
// SetLastNtError(Status);
RETURN(NULL);
}
RETURN(hDesk);
CLEANUP:
TRACE("Leave NtUserCreateDesktop, ret=0x%p\n", _ret_);
UserLeave();
END_CLEANUP;
}
/*
* NtUserOpenDesktop
*
* Opens an existing desktop.
*
* Parameters
* lpszDesktopName
* Name of the existing desktop.
*
* dwFlags
* Interaction flags.
*
* dwDesiredAccess
* Requested type of access.
*
* Return Value
* Handle to the desktop or zero on failure.
*
* Status
* @implemented
*/
HDESK APIENTRY
NtUserOpenDesktop(
POBJECT_ATTRIBUTES ObjectAttributes,
DWORD dwFlags,
ACCESS_MASK dwDesiredAccess)
{
NTSTATUS Status;
HDESK Desktop;
Status = ObOpenObjectByName(
ObjectAttributes,
ExDesktopObjectType,
UserMode,
NULL,
dwDesiredAccess,
NULL,
(HANDLE*)&Desktop);
if (!NT_SUCCESS(Status))
{
ERR("Failed to open desktop\n");
SetLastNtError(Status);
return NULL;
}
TRACE("Opened desktop %S with handle 0x%p\n", ObjectAttributes->ObjectName->Buffer, Desktop);
return Desktop;
}
HDESK UserOpenInputDesktop(DWORD dwFlags,
BOOL fInherit,
ACCESS_MASK dwDesiredAccess)
{
PTHREADINFO pti = PsGetCurrentThreadWin32Thread();
NTSTATUS Status;
ULONG HandleAttributes = 0;
HDESK hdesk = NULL;
if (!gpdeskInputDesktop)
{
return NULL;
}
if (pti->ppi->prpwinsta != InputWindowStation)
{
ERR("Tried to open input desktop from non interactive winsta!\n");
EngSetLastError(ERROR_INVALID_FUNCTION);
return NULL;
}
if (fInherit) HandleAttributes = OBJ_INHERIT;
/* Create a new handle to the object */
Status = ObOpenObjectByPointer(
gpdeskInputDesktop,
HandleAttributes,
NULL,
dwDesiredAccess,
ExDesktopObjectType,
UserMode,
(PHANDLE)&hdesk);
if (!NT_SUCCESS(Status))
{
ERR("Failed to open input desktop object\n");
SetLastNtError(Status);
}
return hdesk;
}
/*
* NtUserOpenInputDesktop
*
* Opens the input (interactive) desktop.
*
* Parameters
* dwFlags
* Interaction flags.
*
* fInherit
* Inheritance option.
*
* dwDesiredAccess
* Requested type of access.
*
* Return Value
* Handle to the input desktop or zero on failure.
*
* Status
* @implemented
*/
HDESK APIENTRY
NtUserOpenInputDesktop(
DWORD dwFlags,
BOOL fInherit,
ACCESS_MASK dwDesiredAccess)
{
HDESK hdesk;
UserEnterExclusive();
TRACE("Enter NtUserOpenInputDesktop gpdeskInputDesktop 0x%p\n", gpdeskInputDesktop);
hdesk = UserOpenInputDesktop(dwFlags, fInherit, dwDesiredAccess);
TRACE("NtUserOpenInputDesktop returning 0x%p\n", hdesk);
UserLeave();
return hdesk;
}
/*
* NtUserCloseDesktop
*
* Closes a desktop handle.
*
* Parameters
* hDesktop
* Handle to the desktop.
*
* Return Value
* Status
*
* Remarks
* The desktop handle can be created with NtUserCreateDesktop or
* NtUserOpenDesktop. This function will fail if any thread in the calling
* process is using the specified desktop handle or if the handle refers
* to the initial desktop of the calling process.
*
* Status
* @implemented
*/
BOOL APIENTRY
NtUserCloseDesktop(HDESK hDesktop)
{
PDESKTOP pdesk;
NTSTATUS Status;
DECLARE_RETURN(BOOL);
TRACE("NtUserCloseDesktop(0x%p) called\n", hDesktop);
UserEnterExclusive();
if (hDesktop == gptiCurrent->hdesk || hDesktop == gptiCurrent->ppi->hdeskStartup)
{
ERR("Attempted to close thread desktop\n");
EngSetLastError(ERROR_BUSY);
RETURN(FALSE);
}
Status = IntValidateDesktopHandle(hDesktop, UserMode, 0, &pdesk);
if (!NT_SUCCESS(Status))
{
ERR("Validation of desktop handle 0x%p failed\n", hDesktop);
RETURN(FALSE);
}
ObDereferenceObject(pdesk);
Status = ObCloseHandle(hDesktop, UserMode);
if (!NT_SUCCESS(Status))
{
ERR("Failed to close desktop handle 0x%p\n", hDesktop);
SetLastNtError(Status);
RETURN(FALSE);
}
RETURN(TRUE);
CLEANUP:
TRACE("Leave NtUserCloseDesktop, ret=%i\n", _ret_);
UserLeave();
END_CLEANUP;
}
/*
* NtUserPaintDesktop
*
* The NtUserPaintDesktop function fills the clipping region in the
* specified device context with the desktop pattern or wallpaper. The
* function is provided primarily for shell desktops.
*
* Parameters
* hDC
* Handle to the device context.
*
* Status
* @implemented
*/
BOOL APIENTRY
NtUserPaintDesktop(HDC hDC)
{
BOOL Ret;
UserEnterExclusive();
TRACE("Enter NtUserPaintDesktop\n");
Ret = IntPaintDesktop(hDC);
TRACE("Leave NtUserPaintDesktop, ret=%i\n", Ret);
UserLeave();
return Ret;
}
/*
* NtUserResolveDesktop
*
* The NtUserResolveDesktop function attempts to retrieve valid handles to
* a desktop and a window station suitable for the specified process.
* The specified desktop path string is used only as a hint for the resolution.
*
* See the description of IntResolveDesktop for more details.
*
* Parameters
* ProcessHandle
* Handle to a user process.
*
* DesktopPath
* The desktop path string used as a hint for desktop resolution.
*
* bInherit
* Whether or not the returned handles are inheritable.
*
* phWinSta
* Pointer to a window station handle.
*
* Return Value
* Handle to the desktop (direct return value) and
* handle to the associated window station (by pointer).
* NULL in case of failure.
*
* Remarks
* Callable by CSRSS only.
*
* Status
* @implemented
*/
HDESK
NTAPI
NtUserResolveDesktop(
IN HANDLE ProcessHandle,
IN PUNICODE_STRING DesktopPath,
IN BOOL bInherit,
OUT HWINSTA* phWinSta)
{
NTSTATUS Status;
PEPROCESS Process;
HWINSTA hWinSta = NULL;
HDESK hDesktop = NULL;
UNICODE_STRING CapturedDesktopPath;
/* Allow only the Console Server to perform this operation (via CSRSS) */
if (PsGetCurrentProcess() != gpepCSRSS)
return NULL;
/* Get the process object the user handle was referencing */
Status = ObReferenceObjectByHandle(ProcessHandle,
PROCESS_QUERY_INFORMATION,
*PsProcessType,
UserMode,
(PVOID*)&Process,
NULL);
if (!NT_SUCCESS(Status))
return NULL;
UserEnterExclusive();
_SEH2_TRY
{
/* Probe the handle pointer */
// ProbeForWriteHandle
ProbeForWrite(phWinSta, sizeof(HWINSTA), sizeof(HWINSTA));
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
_SEH2_YIELD(goto Quit);
}
_SEH2_END;
/* Capture the user desktop path string */
Status = ProbeAndCaptureUnicodeString(&CapturedDesktopPath,
UserMode,
DesktopPath);
if (!NT_SUCCESS(Status))
goto Quit;
/* Call the internal function */
Status = IntResolveDesktop(Process,
&CapturedDesktopPath,
bInherit,
&hWinSta,
&hDesktop);
if (!NT_SUCCESS(Status))
{
ERR("IntResolveDesktop failed, Status 0x%08lx\n", Status);
hWinSta = NULL;
hDesktop = NULL;
}
_SEH2_TRY
{
/* Return the window station handle */
*phWinSta = hWinSta;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
Status = _SEH2_GetExceptionCode();
/* We failed, close the opened desktop and window station */
if (hDesktop) ObCloseHandle(hDesktop, UserMode);
hDesktop = NULL;
if (hWinSta) ObCloseHandle(hWinSta, UserMode);
}
_SEH2_END;
/* Free the captured string */
ReleaseCapturedUnicodeString(&CapturedDesktopPath, UserMode);
Quit:
UserLeave();
/* Dereference the process object */
ObDereferenceObject(Process);
/* Return the desktop handle */
return hDesktop;
}
/*
* NtUserSwitchDesktop
*
* Sets the current input (interactive) desktop.
*
* Parameters
* hDesktop
* Handle to desktop.
*
* Return Value
* Status
*
* Status
* @unimplemented
*/
BOOL APIENTRY
NtUserSwitchDesktop(HDESK hdesk)
{
PDESKTOP pdesk;
NTSTATUS Status;
BOOL bRedrawDesktop;
DECLARE_RETURN(BOOL);
UserEnterExclusive();
TRACE("Enter NtUserSwitchDesktop(0x%p)\n", hdesk);
Status = IntValidateDesktopHandle(hdesk, UserMode, 0, &pdesk);
if (!NT_SUCCESS(Status))
{
ERR("Validation of desktop handle 0x%p failed\n", hdesk);
RETURN(FALSE);
}
if (PsGetCurrentProcessSessionId() != pdesk->rpwinstaParent->dwSessionId)
{
ObDereferenceObject(pdesk);
ERR("NtUserSwitchDesktop called for a desktop of a different session\n");
RETURN(FALSE);
}
if (pdesk == gpdeskInputDesktop)
{
ObDereferenceObject(pdesk);
WARN("NtUserSwitchDesktop called for active desktop\n");
RETURN(TRUE);
}
/*
* Don't allow applications switch the desktop if it's locked, unless the caller
* is the logon application itself
*/
if ((pdesk->rpwinstaParent->Flags & WSS_LOCKED) &&
gpidLogon != PsGetCurrentProcessId())
{
ObDereferenceObject(pdesk);
ERR("Switching desktop 0x%p denied because the window station is locked!\n", hdesk);
RETURN(FALSE);
}
if (pdesk->rpwinstaParent != InputWindowStation)
{
ObDereferenceObject(pdesk);
ERR("Switching desktop 0x%p denied because desktop doesn't belong to the interactive winsta!\n", hdesk);
RETURN(FALSE);
}
/* FIXME: Fail if the process is associated with a secured
desktop such as Winlogon or Screen-Saver */
/* FIXME: Connect to input device */
TRACE("Switching from desktop 0x%p to 0x%p\n", gpdeskInputDesktop, pdesk);
bRedrawDesktop = FALSE;
/* The first time SwitchDesktop is called, gpdeskInputDesktop is NULL */
if (gpdeskInputDesktop != NULL)
{
if ((gpdeskInputDesktop->pDeskInfo->spwnd->style & WS_VISIBLE) == WS_VISIBLE)
bRedrawDesktop = TRUE;
/* Hide the previous desktop window */
IntHideDesktop(gpdeskInputDesktop);
}
/* Set the active desktop in the desktop's window station. */
InputWindowStation->ActiveDesktop = pdesk;
/* Set the global state. */
gpdeskInputDesktop = pdesk;
/* Show the new desktop window */
co_IntShowDesktop(pdesk, UserGetSystemMetrics(SM_CXSCREEN), UserGetSystemMetrics(SM_CYSCREEN), bRedrawDesktop);
TRACE("SwitchDesktop gpdeskInputDesktop 0x%p\n", gpdeskInputDesktop);
ObDereferenceObject(pdesk);
RETURN(TRUE);
CLEANUP:
TRACE("Leave NtUserSwitchDesktop, ret=%i\n", _ret_);
UserLeave();
END_CLEANUP;
}
/*
* NtUserGetThreadDesktop
*
* Status
* @implemented
*/
HDESK APIENTRY
NtUserGetThreadDesktop(DWORD dwThreadId, HDESK hConsoleDesktop)
{
HDESK hDesk;
NTSTATUS Status;
PTHREADINFO pti;
PEPROCESS Process;
PDESKTOP DesktopObject;
OBJECT_HANDLE_INFORMATION HandleInformation;
UserEnterExclusive();
TRACE("Enter NtUserGetThreadDesktop\n");
if (!dwThreadId)
{
EngSetLastError(ERROR_INVALID_PARAMETER);
hDesk = NULL;
goto Quit;
}
/* Validate the Win32 thread and retrieve its information */
pti = IntTID2PTI(UlongToHandle(dwThreadId));
if (pti)
{
/* Get the desktop handle of the thread */
hDesk = pti->hdesk;
Process = pti->ppi->peProcess;
}
else if (hConsoleDesktop)
{
/*
* The thread may belong to a console, so attempt to use the provided
* console desktop handle as a fallback. Otherwise this means that the
* thread is either not Win32 or invalid.
*/
hDesk = hConsoleDesktop;
Process = gpepCSRSS;
}
else
{
EngSetLastError(ERROR_INVALID_PARAMETER);
hDesk = NULL;
goto Quit;
}
if (!hDesk)
{
ERR("Desktop information of thread 0x%x broken!?\n", dwThreadId);
goto Quit;
}
if (Process == PsGetCurrentProcess())
{
/*
* Just return the handle, since we queried the desktop handle
* of a thread running in the same context.
*/
goto Quit;
}
/*
* We could just use the cached rpdesk instead of looking up the handle,
* but it may actually be safer to validate the desktop and get a temporary
* reference to it so that it does not disappear under us (e.g. when the
* desktop is being destroyed) during the operation.
*/
/*
* Switch into the context of the thread we are trying to get
* the desktop from, so we can use the handle.
*/
KeAttachProcess(&Process->Pcb);
Status = ObReferenceObjectByHandle(hDesk,
0,
ExDesktopObjectType,
UserMode,
(PVOID*)&DesktopObject,
&HandleInformation);
KeDetachProcess();
if (NT_SUCCESS(Status))
{
/*
* Lookup our handle table if we can find a handle to the desktop object.
* If not, create one.
* QUESTION: Do we really need to create a handle in case it doesn't exist??
*/
hDesk = IntGetDesktopObjectHandle(DesktopObject);
/* All done, we got a valid handle to the desktop */
ObDereferenceObject(DesktopObject);
}
else
{
/* The handle could not be found, there is nothing to get... */
hDesk = NULL;
}
if (!hDesk)
{
ERR("Could not retrieve or access desktop for thread 0x%x\n", dwThreadId);
EngSetLastError(ERROR_ACCESS_DENIED);
}
Quit:
TRACE("Leave NtUserGetThreadDesktop, hDesk = 0x%p\n", hDesk);
UserLeave();
return hDesk;
}
static NTSTATUS
IntUnmapDesktopView(IN PDESKTOP pdesk)
{
PPROCESSINFO ppi;
PW32HEAP_USER_MAPPING HeapMapping, *PrevLink;
NTSTATUS Status = STATUS_SUCCESS;
TRACE("IntUnmapDesktopView called for desktop object %p\n", pdesk);
ppi = PsGetCurrentProcessWin32Process();
/*
* Unmap if we're the last thread using the desktop.
* Start the search at the next mapping: skip the first entry
* as it must be the global user heap mapping.
*/
PrevLink = &ppi->HeapMappings.Next;
HeapMapping = *PrevLink;
while (HeapMapping != NULL)
{
if (HeapMapping->KernelMapping == (PVOID)pdesk->pheapDesktop)
{
if (--HeapMapping->Count == 0)
{
*PrevLink = HeapMapping->Next;
TRACE("ppi 0x%p unmapped heap of desktop 0x%p\n", ppi, pdesk);
Status = MmUnmapViewOfSection(PsGetCurrentProcess(),
HeapMapping->UserMapping);
ObDereferenceObject(pdesk);
UserHeapFree(HeapMapping);
break;
}
}
PrevLink = &HeapMapping->Next;
HeapMapping = HeapMapping->Next;
}
return Status;
}
static NTSTATUS
IntMapDesktopView(IN PDESKTOP pdesk)
{
PPROCESSINFO ppi;
PW32HEAP_USER_MAPPING HeapMapping, *PrevLink;
PVOID UserBase = NULL;
SIZE_T ViewSize = 0;
LARGE_INTEGER Offset;
NTSTATUS Status;
TRACE("IntMapDesktopView called for desktop object 0x%p\n", pdesk);
ppi = PsGetCurrentProcessWin32Process();
/*
* Find out if another thread already mapped the desktop heap.
* Start the search at the next mapping: skip the first entry
* as it must be the global user heap mapping.
*/
PrevLink = &ppi->HeapMappings.Next;
HeapMapping = *PrevLink;
while (HeapMapping != NULL)
{
if (HeapMapping->KernelMapping == (PVOID)pdesk->pheapDesktop)
{
HeapMapping->Count++;
return STATUS_SUCCESS;
}
PrevLink = &HeapMapping->Next;
HeapMapping = HeapMapping->Next;
}
/* We're the first, map the heap */
Offset.QuadPart = 0;
Status = MmMapViewOfSection(pdesk->hsectionDesktop,
PsGetCurrentProcess(),
&UserBase,
0,
0,
&Offset,
&ViewSize,
ViewUnmap,
SEC_NO_CHANGE,
PAGE_EXECUTE_READ); /* Would prefer PAGE_READONLY, but thanks to RTL heaps... */
if (!NT_SUCCESS(Status))
{
ERR("Failed to map desktop\n");
return Status;
}
TRACE("ppi 0x%p mapped heap of desktop 0x%p\n", ppi, pdesk);
/* Add the mapping */
HeapMapping = UserHeapAlloc(sizeof(*HeapMapping));
if (HeapMapping == NULL)
{
MmUnmapViewOfSection(PsGetCurrentProcess(), UserBase);
ERR("UserHeapAlloc() failed!\n");
return STATUS_NO_MEMORY;
}
HeapMapping->Next = NULL;
HeapMapping->KernelMapping = (PVOID)pdesk->pheapDesktop;
HeapMapping->UserMapping = UserBase;
HeapMapping->Limit = ViewSize;
HeapMapping->Count = 1;
*PrevLink = HeapMapping;
ObReferenceObject(pdesk);
return STATUS_SUCCESS;
}
BOOL
IntSetThreadDesktop(IN HDESK hDesktop,
IN BOOL FreeOnFailure)
{
PDESKTOP pdesk = NULL, pdeskOld;
PTHREADINFO pti;
NTSTATUS Status;
PCLIENTTHREADINFO pctiOld, pctiNew = NULL;
PCLIENTINFO pci;
ASSERT(NtCurrentTeb());
TRACE("IntSetThreadDesktop hDesktop:0x%p, FOF:%i\n",hDesktop, FreeOnFailure);
pti = PsGetCurrentThreadWin32Thread();
pci = pti->pClientInfo;
/* If the caller gave us a desktop, ensure it is valid */
if (hDesktop != NULL)
{
/* Validate the new desktop. */
Status = IntValidateDesktopHandle(hDesktop, UserMode, 0, &pdesk);
if (!NT_SUCCESS(Status))
{
ERR("Validation of desktop handle 0x%p failed\n", hDesktop);
return FALSE;
}
if (pti->rpdesk == pdesk)
{
/* Nothing to do */
ObDereferenceObject(pdesk);
return TRUE;
}
}
/* Make sure that we don't own any window in the current desktop */
if (!IsListEmpty(&pti->WindowListHead))
{
if (pdesk)
ObDereferenceObject(pdesk);
ERR("Attempted to change thread desktop although the thread has windows!\n");
EngSetLastError(ERROR_BUSY);
return FALSE;
}
/* Desktop is being re-set so clear out foreground. */
if (pti->rpdesk != pdesk && pti->MessageQueue == gpqForeground)
{
// Like above, there shouldn't be any windows, hooks or anything active on this threads desktop!
IntSetFocusMessageQueue(NULL);
}
/* Before doing the switch, map the new desktop heap and allocate the new pcti */
if (pdesk != NULL)
{
Status = IntMapDesktopView(pdesk);
if (!NT_SUCCESS(Status))
{
ERR("Failed to map desktop heap!\n");
ObDereferenceObject(pdesk);
SetLastNtError(Status);
return FALSE;
}
pctiNew = DesktopHeapAlloc(pdesk, sizeof(CLIENTTHREADINFO));
if (pctiNew == NULL)
{
ERR("Failed to allocate new pcti\n");
IntUnmapDesktopView(pdesk);
ObDereferenceObject(pdesk);
EngSetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
}
/*
* Processes, in particular Winlogon.exe, that manage window stations
* (especially the interactive WinSta0 window station) and desktops,
* may not be able to connect at startup to a window station and have
* an associated desktop as well, if none exists on the system already.
* Because creating a new window station does not affect the window station
* associated to the process, and because neither by associating a window
* station to the process nor creating a new desktop on it does associate
* a startup desktop to that process, the process has to actually assigns
* one of its threads to a desktop so that it gets automatically an assigned
* startup desktop.
*
* This is what actually happens for Winlogon.exe, which is started without
* any window station and desktop. By creating the first (and therefore
* interactive) WinSta0 window station, then assigning WinSta0 to itself
* and creating the Default desktop on it, and then assigning this desktop
* to its main thread, Winlogon.exe basically does the similar steps that
* would have been done automatically at its startup if there were already
* an existing WinSta0 window station and Default desktop.
*
* Of course all this must not be done if we are a SYSTEM or CSRSS thread.
*/
// if (pti->ppi->peProcess != gpepCSRSS)
if (!(pti->TIF_flags & (TIF_SYSTEMTHREAD | TIF_CSRSSTHREAD)) &&
pti->ppi->rpdeskStartup == NULL && hDesktop != NULL)
{
ERR("The process 0x%p '%s' didn't have an assigned startup desktop before, assigning it now!\n",
pti->ppi->peProcess, pti->ppi->peProcess->ImageFileName);
pti->ppi->hdeskStartup = hDesktop;
pti->ppi->rpdeskStartup = pdesk;
}
/* free all classes or move them to the shared heap */
if (pti->rpdesk != NULL)
{
if (!IntCheckProcessDesktopClasses(pti->rpdesk, FreeOnFailure))
{
ERR("Failed to move process classes to shared heap!\n");
if (pdesk)
{
DesktopHeapFree(pdesk, pctiNew);
IntUnmapDesktopView(pdesk);
ObDereferenceObject(pdesk);
}
return FALSE;
}
}
pdeskOld = pti->rpdesk;
if (pti->pcti != &pti->cti)
pctiOld = pti->pcti;
else
pctiOld = NULL;
/* do the switch */
if (pdesk != NULL)
{
pti->rpdesk = pdesk;
pti->hdesk = hDesktop;
pti->pDeskInfo = pti->rpdesk->pDeskInfo;
pti->pcti = pctiNew;
pci->ulClientDelta = DesktopHeapGetUserDelta();
pci->pDeskInfo = (PVOID)((ULONG_PTR)pti->pDeskInfo - pci->ulClientDelta);
pci->pClientThreadInfo = (PVOID)((ULONG_PTR)pti->pcti - pci->ulClientDelta);
/* initialize the new pcti */
if (pctiOld != NULL)
{
RtlCopyMemory(pctiNew, pctiOld, sizeof(CLIENTTHREADINFO));
}
else
{
RtlZeroMemory(pctiNew, sizeof(CLIENTTHREADINFO));
pci->fsHooks = pti->fsHooks;
pci->dwTIFlags = pti->TIF_flags;
}
}
else
{
pti->rpdesk = NULL;
pti->hdesk = NULL;
pti->pDeskInfo = NULL;
pti->pcti = &pti->cti; // Always point inside so there will be no crash when posting or sending msg's!
pci->ulClientDelta = 0;
pci->pDeskInfo = NULL;
pci->pClientThreadInfo = NULL;
}
/* clean up the old desktop */
if (pdeskOld != NULL)
{
RemoveEntryList(&pti->PtiLink);
if (pctiOld) DesktopHeapFree(pdeskOld, pctiOld);
IntUnmapDesktopView(pdeskOld);
ObDereferenceObject(pdeskOld);
}
if (pdesk)
{
InsertTailList(&pdesk->PtiList, &pti->PtiLink);
}
TRACE("IntSetThreadDesktop: pti 0x%p ppi 0x%p switched from object 0x%p to 0x%p\n", pti, pti->ppi, pdeskOld, pdesk);
return TRUE;
}
/*
* NtUserSetThreadDesktop
*
* Status
* @implemented
*/
BOOL APIENTRY
NtUserSetThreadDesktop(HDESK hDesktop)
{
BOOL ret = FALSE;
UserEnterExclusive();
// FIXME: IntSetThreadDesktop validates the desktop handle, it should happen
// here too and set the NT error level. Q. Is it necessary to have the validation
// in IntSetThreadDesktop? Is it needed there too?
if (hDesktop || (!hDesktop && PsGetCurrentProcess() == gpepCSRSS))
ret = IntSetThreadDesktop(hDesktop, FALSE);
UserLeave();
return ret;
}
/* EOF */
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