| 1 | /* $Id: RTSystemFirmware-linux.cpp 96407 2022-08-22 17:43:14Z 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) 2019-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include "internal/iprt.h"
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| 42 | #include <iprt/system.h>
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| 43 |
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| 44 | #include <iprt/err.h>
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| 45 | #include <iprt/file.h>
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| 46 | #include <iprt/string.h>
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| 47 | #include <iprt/linux/sysfs.h>
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| 48 |
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| 49 |
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| 50 | /*********************************************************************************************************************************
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| 51 | * Defined Constants And Macros *
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| 52 | *********************************************************************************************************************************/
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| 53 | /** Defines the UEFI Globals UUID that is used here as filename suffix (case sensitive). */
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| 54 | #define VBOX_UEFI_UUID_GLOBALS "8be4df61-93ca-11d2-aa0d-00e098032b8c"
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| 55 |
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| 56 |
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| 57 | RTDECL(int) RTSystemQueryFirmwareType(PRTSYSFWTYPE penmFirmwareType)
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| 58 | {
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| 59 | if (RTLinuxSysFsExists("firmware/efi/"))
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| 60 | *penmFirmwareType = RTSYSFWTYPE_UEFI;
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| 61 | else if (RTLinuxSysFsExists(""))
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| 62 | *penmFirmwareType = RTSYSFWTYPE_BIOS;
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| 63 | else
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| 64 | {
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| 65 | *penmFirmwareType = RTSYSFWTYPE_INVALID;
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| 66 | return VERR_NOT_SUPPORTED;
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| 67 | }
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| 68 | return VINF_SUCCESS;
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| 69 | }
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| 70 | RT_EXPORT_SYMBOL(RTSystemQueryFirmwareType);
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| 71 |
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| 72 |
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| 73 | RTDECL(int) RTSystemQueryFirmwareBoolean(RTSYSFWBOOL enmBoolean, bool *pfValue)
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| 74 | {
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| 75 | *pfValue = false;
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| 76 |
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| 77 | /*
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| 78 | * Translate the property to variable base filename.
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| 79 | */
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| 80 | const char *pszName;
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| 81 | switch (enmBoolean)
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| 82 | {
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| 83 | case RTSYSFWBOOL_SECURE_BOOT:
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| 84 | pszName = "firmware/efi/efivars/SecureBoot";
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| 85 | break;
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| 86 |
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| 87 | default:
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| 88 | AssertReturn(enmBoolean > RTSYSFWBOOL_INVALID && enmBoolean < RTSYSFWBOOL_END, VERR_INVALID_PARAMETER);
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| 89 | return VERR_SYS_UNSUPPORTED_FIRMWARE_PROPERTY;
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| 90 |
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| 91 | }
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| 92 |
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| 93 | /*
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| 94 | * Try open and read the variable value.
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| 95 | */
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| 96 | RTFILE hFile;
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| 97 | int rc = RTLinuxSysFsOpen(&hFile, "%s-" VBOX_UEFI_UUID_GLOBALS, pszName);
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| 98 | /** @todo try other suffixes if file-not-found. */
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| 99 | if (RT_SUCCESS(rc))
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| 100 | {
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| 101 | uint8_t abBuf[16];
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| 102 | size_t cbRead = 0;
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| 103 | rc = RTLinuxSysFsReadFile(hFile, abBuf, sizeof(abBuf), &cbRead);
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| 104 | *pfValue = cbRead > 1 && abBuf[cbRead - 1] != 0;
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| 105 | RTFileClose(hFile);
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| 106 | }
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| 107 | else if (rc == VERR_FILE_NOT_FOUND || rc == VERR_PATH_NOT_FOUND)
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| 108 | rc = VINF_SUCCESS;
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| 109 | else if (rc == VERR_PERMISSION_DENIED)
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| 110 | rc = VERR_NOT_SUPPORTED;
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| 111 |
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| 112 | return rc;
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| 113 | }
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| 114 | RT_EXPORT_SYMBOL(RTSystemQueryFirmwareBoolean);
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| 115 |
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