1 | /* $Id: RTSystemFirmware-linux.cpp 81137 2019-10-08 08:28:31Z 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) RTSystemQueryFirmwareType(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(RTSystemQueryFirmwareType);
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61 |
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62 |
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63 | RTDECL(int) RTSystemQueryFirmwareBoolean(RTSYSFWPROP enmProp, bool *pfValue)
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64 | {
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65 | *pfValue = false;
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66 |
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67 | /*
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68 | * Translate the property to variable base filename.
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69 | */
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70 | const char *pszName;
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71 | switch (enmProp)
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72 | {
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73 | case RTSYSFWPROP_SECURE_BOOT:
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74 | pszName = "firmware/efi/efivars/SecureBoot";
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75 | break;
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76 |
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77 | default:
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78 | AssertReturn(enmProp > RTSYSFWPROP_INVALID && enmProp < RTSYSFWPROP_END, VERR_INVALID_PARAMETER);
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79 | return VERR_SYS_UNSUPPORTED_FIRMWARE_PROPERTY;
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80 |
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81 | }
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82 |
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83 | /*
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84 | * Try open and read the variable value.
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85 | */
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86 | RTFILE hFile;
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87 | int rc = RTLinuxSysFsOpen(&hFile, "%s-" VBOX_UEFI_UUID_GLOBALS, pszName);
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88 | /** @todo try other suffixes if file-not-found. */
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89 | if (RT_SUCCESS(rc))
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90 | {
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91 | uint8_t abBuf[16];
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92 | size_t cbRead = 0;
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93 | rc = RTLinuxSysFsReadFile(hFile, abBuf, sizeof(abBuf), &cbRead);
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94 | *pfValue = cbRead > 1 && abBuf[cbRead - 1] != 0;
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95 | RTFileClose(hFile);
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96 | }
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97 | else if (rc == VERR_FILE_NOT_FOUND || rc == VERR_PATH_NOT_FOUND)
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98 | rc = VINF_SUCCESS;
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99 | else if (rc == VERR_PERMISSION_DENIED)
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100 | rc = VERR_NOT_SUPPORTED;
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101 |
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102 | return rc;
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103 | }
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104 | RT_EXPORT_SYMBOL(RTSystemQueryFirmwareBoolean);
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105 |
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