245 lines
5 KiB
C
245 lines
5 KiB
C
/*++
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Copyright (c) 1995-2001 Microsoft Corporation
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Module Name:
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osver.c
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Abstract:
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This module contains utility routines for identifying different NT product
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version types, suites, and feature attributes.
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Author:
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Jim Cavalaris (jamesca) 03-07-2001
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Environment:
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User-mode only.
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Revision History:
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07-March-2001 jamesca
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Creation and initial implementation.
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--*/
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//
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// includes
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//
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#include "precomp.h"
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#include "umpnpi.h"
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//
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// global data
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//
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const TCHAR RegWinlogonKeyName[] =
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TEXT("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon");
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const TCHAR RegAllowMultipleTSSessionsValueName[] =
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TEXT("AllowMultipleTSSessions");
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BOOL
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IsEmbeddedNT(
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VOID
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)
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/*++
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Routine Description:
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Check if this is Embedded product suite of NT.
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Arguments:
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None.
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Return Value:
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Return TRUE / FALSE.
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--*/
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{
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static BOOL bVerified = FALSE;
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static BOOL bIsEmbeddedNT = FALSE;
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if (!bVerified) {
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OSVERSIONINFOEX osvix;
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DWORDLONG dwlConditionMask = 0;
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ZeroMemory(&osvix, sizeof(OSVERSIONINFOEX));
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osvix.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
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osvix.wSuiteMask = VER_SUITE_EMBEDDEDNT;
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VER_SET_CONDITION(dwlConditionMask, VER_SUITENAME, VER_OR);
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if (VerifyVersionInfo(&osvix,
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VER_SUITENAME,
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dwlConditionMask)) {
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bIsEmbeddedNT = TRUE;
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}
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bVerified = TRUE;
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}
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return bIsEmbeddedNT;
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} // IsEmbeddedNT
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BOOL
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IsTerminalServer(
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VOID
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)
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/*++
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Routine Description:
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Check if Terminal Services are available on this version of NT.
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Arguments:
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None.
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Return Value:
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Return TRUE / FALSE.
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--*/
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{
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static BOOL bVerified = FALSE;
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static BOOL bIsTerminalServer = FALSE;
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if (!bVerified) {
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OSVERSIONINFOEX osvix;
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DWORDLONG dwlConditionMask = 0;
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ZeroMemory(&osvix, sizeof(OSVERSIONINFOEX));
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osvix.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
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osvix.wSuiteMask = VER_SUITE_TERMINAL | VER_SUITE_SINGLEUSERTS;
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VER_SET_CONDITION(dwlConditionMask, VER_SUITENAME, VER_OR);
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if (VerifyVersionInfo(&osvix, VER_SUITENAME, dwlConditionMask)) {
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bIsTerminalServer = TRUE;
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}
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bVerified = TRUE;
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}
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return bIsTerminalServer;
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} // IsTerminalServer
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BOOL
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IsFastUserSwitchingEnabled(
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VOID
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)
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/*++
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Routine Description:
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Checks to see if Terminal Services Fast User Switching is enabled. This is
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to check if we should use the physical console session for UI dialogs, or
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always use session 0.
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Fast User Switching exists only on workstation product version, where terminal
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services are available, when AllowMultipleTSSessions is set.
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On server and above, or when multiple TS users are not allowed, session 0
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can only be attached remotely be special request, in which case it should be
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considered the "Console" session.
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Arguments:
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None.
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Return Value:
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Returns TRUE if Fast User Switching is currently enabled, FALSE otherwise.
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--*/
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{
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static BOOL bVerified = FALSE;
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static BOOL bIsTSWorkstation = FALSE;
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HKEY hKey;
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ULONG ulSize, ulValue;
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BOOL bFusEnabled;
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//
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// Verify the product version if we haven't already.
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//
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if (!bVerified) {
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OSVERSIONINFOEX osvix;
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DWORDLONG dwlConditionMask = 0;
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ZeroMemory(&osvix, sizeof(OSVERSIONINFOEX));
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osvix.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
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osvix.wProductType = VER_NT_WORKSTATION;
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VER_SET_CONDITION(dwlConditionMask, VER_PRODUCT_TYPE, VER_LESS_EQUAL);
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osvix.wSuiteMask = VER_SUITE_TERMINAL | VER_SUITE_SINGLEUSERTS;
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VER_SET_CONDITION(dwlConditionMask, VER_SUITENAME, VER_OR);
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if (VerifyVersionInfo(&osvix,
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VER_PRODUCT_TYPE | VER_SUITENAME,
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dwlConditionMask)) {
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bIsTSWorkstation = TRUE;
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}
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bVerified = TRUE;
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}
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//
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// Fast user switching (FUS) only applies to the Workstation product where
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// Terminal Services are enabled (i.e. Personal, Professional).
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//
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if (!bIsTSWorkstation) {
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return FALSE;
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}
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//
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// Check if multiple TS sessions are currently allowed. We can't make this
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// info static because it can change dynamically.
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//
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if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
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RegWinlogonKeyName,
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0,
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KEY_READ,
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&hKey) != ERROR_SUCCESS) {
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return FALSE;
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}
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ulValue = 0;
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ulSize = sizeof(ulValue);
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bFusEnabled = FALSE;
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if (RegQueryValueEx(hKey,
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RegAllowMultipleTSSessionsValueName,
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NULL,
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NULL,
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(LPBYTE)&ulValue,
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&ulSize) == ERROR_SUCCESS) {
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bFusEnabled = (ulValue != 0);
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}
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RegCloseKey(hKey);
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return bFusEnabled;
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} // IsFastUserSwitchingEnabled
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