| 1 | /* $Id: RTSystemFirmware-linux.cpp 81065 2019-09-28 00:12:32Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - System firmware information, linux.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2019 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 "internal/iprt.h"
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| 32 | #include <iprt/system.h>
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| 33 |
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| 34 | #include <iprt/err.h>
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| 35 | #include <iprt/file.h>
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| 36 | #include <iprt/string.h>
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| 37 | #include <iprt/linux/sysfs.h>
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| 38 |
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| 39 |
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| 40 | /*********************************************************************************************************************************
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| 41 | * Defined Constants And Macros *
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| 42 | *********************************************************************************************************************************/
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| 43 | /** Defines the UEFI Globals UUID that is used here as filename suffix (case sensitive). */
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| 44 | #define VBOX_UEFI_UUID_GLOBALS "8be4df61-93ca-11d2-aa0d-00e098032b8c"
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| 45 |
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| 46 |
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| 47 | RTDECL(int) RTSystemFirmwareQueryType(PRTSYSFWTYPE penmFirmwareType)
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| 48 | {
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| 49 | if (RTLinuxSysFsExists("firmware/efi/"))
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| 50 | *penmFirmwareType = RTSYSFWTYPE_UEFI;
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| 51 | else if (RTLinuxSysFsExists(""))
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| 52 | *penmFirmwareType = RTSYSFWTYPE_BIOS;
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| 53 | else
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| 54 | {
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| 55 | *penmFirmwareType = RTSYSFWTYPE_INVALID;
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| 56 | return VERR_NOT_SUPPORTED;
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| 57 | }
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| 58 | return VINF_SUCCESS;
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| 59 | }
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| 60 | RT_EXPORT_SYMBOL(RTSystemFirmwareQueryType);
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| 61 |
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| 62 |
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| 63 | RTDECL(void) RTSystemFirmwareFreeValue(PRTSYSFWVALUE pValue)
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| 64 | {
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| 65 | RT_NOREF(pValue);
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| 66 | }
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| 67 | RT_EXPORT_SYMBOL(RTSystemFirmwareFreeValue);
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| 68 |
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| 69 |
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| 70 | RTDECL(int) RTSystemFirmwareQueryValue(RTSYSFWPROP enmProp, PRTSYSFWVALUE pValue)
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| 71 | {
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| 72 | RT_ZERO(*pValue);
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| 73 |
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| 74 | /*
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| 75 | * Translate the property into type and variable base filename.
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| 76 | */
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| 77 | const char *pszName;
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| 78 | switch (enmProp)
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| 79 | {
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| 80 | case RTSYSFWPROP_SECURE_BOOT:
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| 81 | pValue->enmType = RTSYSFWVALUETYPE_BOOLEAN;
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| 82 | pszName = "firmware/efi/efivars/SecureBoot";
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| 83 | break;
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| 84 |
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| 85 | default:
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| 86 | AssertReturn(enmProp > RTSYSFWPROP_INVALID && enmProp < RTSYSFWPROP_END, VERR_INVALID_PARAMETER);
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| 87 | return VERR_SYS_UNSUPPORTED_FIRMWARE_PROPERTY;
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| 88 |
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| 89 | }
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| 90 |
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| 91 | /*
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| 92 | * Try open and read the variable value.
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| 93 | */
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| 94 | RTFILE hFile;
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| 95 | int rc = RTLinuxSysFsOpen(&hFile, "%s-" VBOX_UEFI_UUID_GLOBALS, pszName);
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| 96 | /** @todo try other suffixes if file-not-found. */
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| 97 |
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| 98 | switch (pValue->enmType)
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| 99 | {
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| 100 | case RTSYSFWVALUETYPE_BOOLEAN:
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| 101 | {
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| 102 | if (RT_SUCCESS(rc))
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| 103 | {
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| 104 | uint8_t abBuf[16];
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| 105 | size_t cbRead = 0;
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| 106 | rc = RTLinuxSysFsReadFile(hFile, abBuf, sizeof(abBuf), &cbRead);
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| 107 | pValue->u.fVal = cbRead > 1 && abBuf[cbRead - 1] != 0;
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| 108 | RTFileClose(hFile);
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| 109 | }
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| 110 | else if (rc == VERR_PERMISSION_DENIED)
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| 111 | rc = VINF_SUCCESS;
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| 112 | break;
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| 113 | }
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| 114 |
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| 115 | default:
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| 116 | AssertFailedReturn(VERR_INTERNAL_ERROR);
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| 117 | }
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| 118 |
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| 119 | return rc;
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| 120 | }
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| 121 | RT_EXPORT_SYMBOL(RTSystemFirmwareQueryValue);
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| 122 |
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