| 1 | /* $Id: VBoxHook.cpp 95871 2022-07-27 02:38:21Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxHook -- Global windows hook dll
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.alldomusa.eu.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #include <iprt/win/windows.h>
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| 23 |
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| 24 | #include <VBoxHook.h>
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| 25 | #include <VBox/VBoxGuestLib.h>
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| 26 | #ifdef DEBUG
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| 27 | # include <VBox/VBoxGuest.h>
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| 28 | # include <VBox/VMMDev.h>
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| 29 | # include <iprt/string.h>
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| 30 | #endif
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| 31 |
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| 32 |
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| 33 | /*********************************************************************************************************************************
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| 34 | * Global Variables *
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| 35 | *********************************************************************************************************************************/
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| 36 | #pragma data_seg("SHARED")
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| 37 | static HWINEVENTHOOK g_ahWinEventHook[2] = { NULL, NULL };
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| 38 | static HWINEVENTHOOK g_hDesktopEventHook = NULL;
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| 39 | #pragma data_seg()
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| 40 | #pragma comment(linker, "/section:SHARED,RWS")
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| 41 |
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| 42 | static HANDLE g_hWinNotifyEvent = NULL;
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| 43 | static HANDLE g_hDesktopNotifyEvent = NULL;
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| 44 |
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| 45 |
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| 46 | /*********************************************************************************************************************************
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| 47 | * Internal Functions *
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| 48 | *********************************************************************************************************************************/
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| 49 | #ifdef DEBUG
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| 50 | static void WriteLog(const char *pszFormat, ...);
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| 51 | # define dprintf(a) do { WriteLog a; } while (0)
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| 52 | #else
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| 53 | # define dprintf(a) do {} while (0)
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| 54 | #endif /* !DEBUG */
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| 55 |
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| 56 |
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| 57 | static void CALLBACK VBoxHandleWinEvent(HWINEVENTHOOK hWinEventHook, DWORD event, HWND hwnd,
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| 58 | LONG idObject, LONG idChild,
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| 59 | DWORD dwEventThread, DWORD dwmsEventTime) RT_NOTHROW_DEF
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| 60 | {
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| 61 | RT_NOREF(hWinEventHook, idChild, dwEventThread, dwmsEventTime);
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| 62 | DWORD dwStyle;
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| 63 | if ( idObject != OBJID_WINDOW
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| 64 | || !hwnd)
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| 65 | return;
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| 66 |
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| 67 | dwStyle = GetWindowLong(hwnd, GWL_STYLE);
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| 68 | if (dwStyle & WS_CHILD)
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| 69 | return;
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| 70 |
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| 71 | switch(event)
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| 72 | {
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| 73 | case EVENT_OBJECT_LOCATIONCHANGE:
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| 74 | if (!(dwStyle & WS_VISIBLE))
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| 75 | return;
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| 76 |
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| 77 | case EVENT_OBJECT_CREATE:
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| 78 | case EVENT_OBJECT_DESTROY:
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| 79 | case EVENT_OBJECT_HIDE:
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| 80 | case EVENT_OBJECT_SHOW:
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| 81 | #ifdef DEBUG
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| 82 | switch(event)
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| 83 | {
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| 84 | case EVENT_OBJECT_LOCATIONCHANGE:
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| 85 | dprintf(("VBoxHandleWinEvent EVENT_OBJECT_LOCATIONCHANGE for window %x\n", hwnd));
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| 86 | break;
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| 87 | case EVENT_OBJECT_CREATE:
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| 88 | dprintf(("VBoxHandleWinEvent EVENT_OBJECT_CREATE for window %x\n", hwnd));
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| 89 | break;
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| 90 | case EVENT_OBJECT_HIDE:
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| 91 | dprintf(("VBoxHandleWinEvent EVENT_OBJECT_HIDE for window %x\n", hwnd));
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| 92 | break;
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| 93 | case EVENT_OBJECT_SHOW:
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| 94 | dprintf(("VBoxHandleWinEvent EVENT_OBJECT_SHOW for window %x\n", hwnd));
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| 95 | break;
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| 96 | case EVENT_OBJECT_DESTROY:
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| 97 | dprintf(("VBoxHandleWinEvent EVENT_OBJECT_DESTROY for window %x\n", hwnd));
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| 98 | break;
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| 99 | }
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| 100 | #endif
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| 101 | if (!g_hWinNotifyEvent)
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| 102 | {
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| 103 | g_hWinNotifyEvent = OpenEvent(EVENT_MODIFY_STATE, FALSE, VBOXHOOK_GLOBAL_WT_EVENT_NAME);
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| 104 | dprintf(("OpenEvent returned %x (last err=%x)\n", g_hWinNotifyEvent, GetLastError()));
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| 105 | }
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| 106 | BOOL fRc = SetEvent(g_hWinNotifyEvent);
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| 107 | dprintf(("SetEvent %x returned %d (last error %x)\n", g_hWinNotifyEvent, fRc, GetLastError())); NOREF(fRc);
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| 108 | break;
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| 109 | }
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| 110 | }
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| 111 |
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| 112 | static void CALLBACK VBoxHandleDesktopEvent(HWINEVENTHOOK hWinEventHook, DWORD event, HWND hwnd,
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| 113 | LONG idObject, LONG idChild,
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| 114 | DWORD dwEventThread, DWORD dwmsEventTime) RT_NOTHROW_DEF
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| 115 | {
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| 116 | RT_NOREF(hWinEventHook, event, hwnd, idObject, idChild, dwEventThread, dwmsEventTime);
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| 117 | if (!g_hDesktopNotifyEvent)
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| 118 | {
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| 119 | g_hDesktopNotifyEvent = OpenEvent(EVENT_MODIFY_STATE, FALSE, VBOXHOOK_GLOBAL_DT_EVENT_NAME);
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| 120 | dprintf(("OpenEvent returned %x (last err=%x)\n", g_hDesktopNotifyEvent, GetLastError()));
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| 121 | }
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| 122 | BOOL fRc = SetEvent(g_hDesktopNotifyEvent);
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| 123 | dprintf(("SetEvent %x returned %d (last error %x)\n", g_hDesktopNotifyEvent, fRc, GetLastError())); NOREF(fRc);
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| 124 | }
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| 125 |
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| 126 | BOOL VBoxHookInstallActiveDesktopTracker(HMODULE hDll)
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| 127 | {
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| 128 | if (g_hDesktopEventHook)
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| 129 | return TRUE;
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| 130 |
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| 131 | CoInitialize(NULL);
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| 132 | g_hDesktopEventHook = SetWinEventHook(EVENT_SYSTEM_DESKTOPSWITCH, EVENT_SYSTEM_DESKTOPSWITCH,
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| 133 | hDll,
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| 134 | VBoxHandleDesktopEvent,
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| 135 | 0, 0,
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| 136 | 0);
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| 137 |
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| 138 | return !!g_hDesktopEventHook;
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| 139 |
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| 140 | }
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| 141 |
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| 142 | BOOL VBoxHookRemoveActiveDesktopTracker()
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| 143 | {
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| 144 | if (g_hDesktopEventHook)
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| 145 | {
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| 146 | UnhookWinEvent(g_hDesktopEventHook);
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| 147 | CoUninitialize();
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| 148 | }
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| 149 | g_hDesktopEventHook = 0;
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| 150 | return TRUE;
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| 151 | }
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| 152 |
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| 153 | /** Install the global message hook */
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| 154 | BOOL VBoxHookInstallWindowTracker(HMODULE hDll)
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| 155 | {
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| 156 | if (g_ahWinEventHook[0] || g_ahWinEventHook[1])
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| 157 | return TRUE;
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| 158 |
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| 159 | CoInitialize(NULL);
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| 160 | g_ahWinEventHook[0] = SetWinEventHook(EVENT_OBJECT_LOCATIONCHANGE, EVENT_OBJECT_LOCATIONCHANGE,
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| 161 | hDll,
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| 162 | VBoxHandleWinEvent,
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| 163 | 0, 0,
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| 164 | WINEVENT_INCONTEXT | WINEVENT_SKIPOWNPROCESS);
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| 165 |
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| 166 | g_ahWinEventHook[1] = SetWinEventHook(EVENT_OBJECT_CREATE, EVENT_OBJECT_HIDE,
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| 167 | hDll,
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| 168 | VBoxHandleWinEvent,
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| 169 | 0, 0,
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| 170 | WINEVENT_INCONTEXT | WINEVENT_SKIPOWNPROCESS);
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| 171 | return !!g_ahWinEventHook[0];
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| 172 | }
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| 173 |
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| 174 | /** Remove the global message hook */
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| 175 | BOOL VBoxHookRemoveWindowTracker()
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| 176 | {
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| 177 | if (g_ahWinEventHook[0] && g_ahWinEventHook[1])
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| 178 | {
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| 179 | UnhookWinEvent(g_ahWinEventHook[0]);
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| 180 | UnhookWinEvent(g_ahWinEventHook[1]);
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| 181 | CoUninitialize();
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| 182 | }
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| 183 | g_ahWinEventHook[0] = g_ahWinEventHook[1] = 0;
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| 184 | return TRUE;
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| 185 | }
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| 186 |
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| 187 |
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| 188 | #ifdef DEBUG
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| 189 | /**
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| 190 | * dprintf worker using VBoxGuest.sys and VMMDevReq_LogString.
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| 191 | */
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| 192 | static void WriteLog(const char *pszFormat, ...)
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| 193 | {
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| 194 | /*
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| 195 | * Open VBox guest driver once.
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| 196 | */
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| 197 | static HANDLE s_hVBoxGuest = INVALID_HANDLE_VALUE;
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| 198 | HANDLE hVBoxGuest = s_hVBoxGuest;
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| 199 | if (hVBoxGuest == INVALID_HANDLE_VALUE)
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| 200 | {
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| 201 | hVBoxGuest = CreateFile(VBOXGUEST_DEVICE_NAME,
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| 202 | GENERIC_READ | GENERIC_WRITE,
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| 203 | FILE_SHARE_READ | FILE_SHARE_WRITE,
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| 204 | NULL,
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| 205 | OPEN_EXISTING,
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| 206 | FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
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| 207 | NULL);
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| 208 | if (hVBoxGuest == INVALID_HANDLE_VALUE)
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| 209 | return;
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| 210 | s_hVBoxGuest = hVBoxGuest;
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| 211 | }
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| 212 |
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| 213 | /*
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| 214 | * We're apparently afraid of using stack here, so we use a static buffer
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| 215 | * instead and pray we won't be here at the same time on two threads...
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| 216 | */
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| 217 | static union
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| 218 | {
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| 219 | VMMDevReqLogString Req;
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| 220 | uint8_t abBuf[1024];
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| 221 | } s_uBuf;
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| 222 |
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| 223 | vmmdevInitRequest(&s_uBuf.Req.header, VMMDevReq_LogString);
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| 224 |
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| 225 | va_list va;
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| 226 | va_start(va, pszFormat);
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| 227 | size_t cch = RTStrPrintf(s_uBuf.Req.szString, sizeof(s_uBuf.Req.szString), pszFormat, va);
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| 228 | va_end(va);
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| 229 |
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| 230 | s_uBuf.Req.header.size += (uint32_t)cch;
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| 231 | if (s_uBuf.Req.header.size > sizeof(s_uBuf))
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| 232 | __debugbreak();
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| 233 |
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| 234 | DWORD cbReturned;
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| 235 | DeviceIoControl(hVBoxGuest, VBGL_IOCTL_VMMDEV_REQUEST(s_uBuf.Req.size),
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| 236 | &s_uBuf.Req, s_uBuf.Req.header.size,
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| 237 | &s_uBuf.Req, s_uBuf.Req.header.size,
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| 238 | &cbReturned, NULL);
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| 239 | }
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| 240 | #endif /* DEBUG */
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| 241 |
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