| 1 | /* $Id: VBoxMMR.cpp 51469 2014-05-30 11:49:42Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxMMR - Multimedia Redirection
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2012-2014 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.virtualbox.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 | #include "VBoxTray.h"
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| 19 | #include "VBoxMMR.h"
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| 20 | #include <iprt/ldr.h>
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| 21 |
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| 22 | #ifdef DEBUG
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| 23 | # define LOG_ENABLED
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| 24 | # define LOG_GROUP LOG_GROUP_DEFAULT
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| 25 | #endif
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| 26 | #include <VBox/log.h>
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| 27 |
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| 28 |
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| 29 |
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| 30 | struct VBOXMMRCONTEXT
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| 31 | {
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| 32 | RTLDRMOD hModHook;
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| 33 | HHOOK hHook;
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| 34 | };
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| 35 |
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| 36 | static VBOXMMRCONTEXT gCtx = {0};
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| 37 |
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| 38 | static const char *g_pszMMRDLL = "VBoxMMRHook";
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| 39 | static const char *g_pszMMRPROC = "CBTProc";
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| 40 |
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| 41 | void VBoxMMRCleanup(VBOXMMRCONTEXT *pCtx)
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| 42 | {
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| 43 | if (pCtx->hHook)
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| 44 | {
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| 45 | UnhookWindowsHookEx(pCtx->hHook);
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| 46 | pCtx->hHook = NULL;
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| 47 | }
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| 48 |
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| 49 | if (pCtx->hModHook != NIL_RTLDRMOD)
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| 50 | {
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| 51 | RTLdrClose(pCtx->hModHook);
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| 52 | pCtx->hModHook = NIL_RTLDRMOD;
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | int VBoxMMRInit(const VBOXSERVICEENV *pEnv, void **ppInstance, bool *pfStartThread)
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| 57 | {
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| 58 | LogFlowFuncEnter();
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| 59 |
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| 60 | int rc = RTLdrLoadAppPriv(g_pszMMRDLL, &gCtx.hModHook);
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| 61 | if (RT_SUCCESS(rc))
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| 62 | {
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| 63 | HOOKPROC pHook = (HOOKPROC)RTLdrGetFunction(gCtx.hModHook, g_pszMMRPROC);
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| 64 | if (pHook)
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| 65 | {
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| 66 | HMODULE hMod = (HMODULE)RTLdrGetNativeHandle(gCtx.hModHook);
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| 67 | Assert(hMod != (HMODULE)~(uintptr_t)0);
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| 68 | gCtx.hHook = SetWindowsHookEx(WH_CBT, pHook, hMod, 0);
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| 69 | if (gCtx.hHook)
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| 70 | {
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| 71 | *ppInstance = &gCtx;
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| 72 | return VINF_SUCCESS;
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| 73 | }
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| 74 |
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| 75 | rc = RTErrConvertFromWin32(GetLastError());
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| 76 | LogFlowFunc(("Error installing hooking proc: %Rrc\n", rc));
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| 77 | }
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| 78 | else
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| 79 | {
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| 80 | LogFlowFunc(("Hooking proc not found\n"));
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| 81 | rc = VERR_NOT_FOUND;
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| 82 | }
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| 83 |
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| 84 | RTLdrClose(gCtx.hModHook);
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| 85 | gCtx.hModHook = NIL_RTLDRMOD;
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| 86 | }
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| 87 | else
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| 88 | LogFlowFunc(("Hooking library not found (%Rrc)\n", rc));
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| 89 |
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| 90 | return rc;
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| 91 | }
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| 92 |
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| 93 | void VBoxMMRDestroy(const VBOXSERVICEENV *pEnv, void *pInstance)
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| 94 | {
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| 95 | VBOXMMRCONTEXT *pCtx = (VBOXMMRCONTEXT *) pInstance;
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| 96 |
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| 97 | VBoxMMRCleanup(pCtx);
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| 98 | }
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| 99 |
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| 100 | unsigned __stdcall VBoxMMRThread(void *pInstance)
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| 101 | {
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| 102 | return 0;
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| 103 | }
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| 104 |
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