| 1 | /* $Id: VBoxGuestR3LibLog.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Logging.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2020 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 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/err.h>
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| 32 | #include <iprt/mem.h>
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| 33 | #include <iprt/string.h>
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| 34 | #include "VBoxGuestR3LibInternal.h"
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| 35 |
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| 36 |
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| 37 | /**
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| 38 | * Write to the backdoor logger from ring 3 guest code.
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| 39 | *
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| 40 | * @returns IPRT status code.
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| 41 | *
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| 42 | * @param pch The string to log. Does not need to be terminated.
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| 43 | * @param cch The number of chars (bytes) to log.
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| 44 | *
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| 45 | * @remarks This currently does not accept more than 255 bytes of data at
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| 46 | * one time. It should probably be rewritten to use pass a pointer
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| 47 | * in the IOCtl.
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| 48 | */
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| 49 | VBGLR3DECL(int) VbglR3WriteLog(const char *pch, size_t cch)
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| 50 | {
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| 51 | /*
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| 52 | * Quietly skip empty strings.
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| 53 | * (Happens in the RTLogBackdoorPrintf case.)
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| 54 | */
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| 55 | int rc;
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| 56 | if (cch > 0)
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| 57 | {
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| 58 | if (RT_VALID_PTR(pch))
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| 59 | {
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| 60 | /*
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| 61 | * We need to repackage the string for ring-0.
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| 62 | */
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| 63 | size_t cbMsg = VBGL_IOCTL_LOG_SIZE(cch);
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| 64 | PVBGLIOCLOG pMsg = (PVBGLIOCLOG)RTMemTmpAlloc(cbMsg);
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| 65 | if (pMsg)
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| 66 | {
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| 67 | VBGLREQHDR_INIT_EX(&pMsg->Hdr, VBGL_IOCTL_LOG_SIZE_IN(cch), VBGL_IOCTL_LOG_SIZE_OUT);
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| 68 | memcpy(pMsg->u.In.szMsg, pch, cch);
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| 69 | pMsg->u.In.szMsg[cch] = '\0';
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| 70 | rc = vbglR3DoIOCtl(VBGL_IOCTL_LOG(cch), &pMsg->Hdr, cbMsg);
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| 71 |
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| 72 | RTMemTmpFree(pMsg);
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| 73 | }
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| 74 | else
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| 75 | rc = VERR_NO_TMP_MEMORY;
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| 76 | }
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| 77 | else
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| 78 | rc = VERR_INVALID_POINTER;
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| 79 | }
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| 80 | else
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| 81 | rc = VINF_SUCCESS;
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| 82 | return rc;
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| 83 | }
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| 84 |
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