| 1 | /* $Id: VBoxSupLib-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - VBoxSupLib.dll, Windows.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/nt/nt-and-windows.h>
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| 42 |
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| 43 | #include <iprt/path.h>
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| 44 |
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| 45 |
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| 46 | /**
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| 47 | * The Dll main entry point.
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| 48 | * @remarks The dllexport is for forcing the linker to generate an import
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| 49 | * library, so the build system doesn't get confused.
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| 50 | */
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| 51 | extern "C" __declspec(dllexport)
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| 52 | BOOL __stdcall DllMainEntrypoint(HANDLE hModule, DWORD dwReason, PVOID pvReserved)
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| 53 | {
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| 54 | RT_NOREF1(pvReserved);
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| 55 |
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| 56 | switch (dwReason)
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| 57 | {
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| 58 | /*
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| 59 | * Make sure the DLL isn't ever unloaded.
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| 60 | */
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| 61 | case DLL_PROCESS_ATTACH:
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| 62 | {
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| 63 | WCHAR wszName[RTPATH_MAX];
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| 64 | SetLastError(NO_ERROR);
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| 65 | if ( GetModuleFileNameW((HMODULE)hModule, wszName, RT_ELEMENTS(wszName)) > 0
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| 66 | && RtlGetLastWin32Error() == NO_ERROR)
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| 67 | {
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| 68 | int cExtraLoads = 2;
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| 69 | while (cExtraLoads-- > 0)
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| 70 | LoadLibraryW(wszName);
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| 71 | }
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| 72 | break;
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| 73 | }
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| 74 |
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| 75 | case DLL_THREAD_ATTACH:
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| 76 | {
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| 77 | #ifdef VBOX_WITH_HARDENING
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| 78 | # ifndef VBOX_WITHOUT_DEBUGGER_CHECKS
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| 79 | /*
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| 80 | * Anti debugging hack that prevents most debug notifications from
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| 81 | * ending up in the debugger.
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| 82 | */
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| 83 | NTSTATUS rcNt = NtSetInformationThread(GetCurrentThread(), ThreadHideFromDebugger, NULL, 0);
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| 84 | if (!NT_SUCCESS(rcNt))
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| 85 | {
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| 86 | __debugbreak();
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| 87 | return FALSE;
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| 88 | }
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| 89 | # endif
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| 90 | #endif
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| 91 | break;
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| 92 | }
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| 93 |
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| 94 | case DLL_THREAD_DETACH:
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| 95 | /* Nothing to do. */
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| 96 | break;
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| 97 |
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| 98 | case DLL_PROCESS_DETACH:
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| 99 | /* Nothing to do. */
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| 100 | break;
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| 101 |
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| 102 | default:
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| 103 | /* ignore */
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| 104 | break;
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| 105 | }
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| 106 | return TRUE;
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| 107 | }
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| 108 |
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