| 1 | /* $Id: RTEfiFatExtract.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Utility for extracting single files from a fat EFI binary.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2019-2023 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 <iprt/formats/efi-fat.h>
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| 42 |
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| 43 | #include <iprt/assert.h>
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| 44 | #include <iprt/errcore.h>
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| 45 | #include <iprt/getopt.h>
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| 46 | #include <iprt/initterm.h>
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| 47 | #include <iprt/file.h>
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| 48 | #include <iprt/mem.h>
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| 49 | #include <iprt/message.h>
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| 50 | #include <iprt/path.h>
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| 51 | #include <iprt/stream.h>
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| 52 | #include <iprt/string.h>
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| 53 |
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| 54 |
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| 55 |
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| 56 | static int efiFatExtractList(const char *pszInput)
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| 57 | {
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| 58 | RTFILE hFile = NIL_RTFILE;
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| 59 | int rc = RTFileOpen(&hFile, pszInput, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);
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| 60 | if (RT_SUCCESS(rc))
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| 61 | {
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| 62 | EFI_FATHDR Hdr;
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| 63 | rc = RTFileReadAt(hFile, 0, &Hdr, sizeof(Hdr), NULL);
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| 64 | if (RT_SUCCESS(rc))
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| 65 | {
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| 66 | if ( RT_LE2H_U32(Hdr.u32Magic) == EFI_FATHDR_MAGIC
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| 67 | && RT_LE2H_U32(Hdr.cFilesEmbedded) <= 16 /*Arbitrary number*/)
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| 68 | {
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| 69 | RTFOFF offRead = sizeof(Hdr);
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| 70 |
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| 71 | for (uint32_t i = 0; i < RT_LE2H_U32(Hdr.cFilesEmbedded); i++)
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| 72 | {
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| 73 | EFI_FATDIRENTRY Entry;
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| 74 | rc = RTFileReadAt(hFile, offRead, &Entry, sizeof(Entry), NULL);
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| 75 | if (RT_SUCCESS(rc))
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| 76 | {
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| 77 | RTPrintf("Entry %u:\n", i);
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| 78 | RTPrintf(" CPU Type: %#x\n", RT_LE2H_U32(Entry.u32CpuType));
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| 79 | RTPrintf(" CPU Subtype: %#x\n", RT_LE2H_U32(Entry.u32CpuSubType));
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| 80 | RTPrintf(" Offset: %#x\n", RT_LE2H_U32(Entry.u32OffsetStart));
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| 81 | RTPrintf(" Size: %#x\n", RT_LE2H_U32(Entry.cbFile));
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| 82 | RTPrintf(" Alignment: %#x\n", RT_LE2H_U32(Entry.u32Alignment));
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| 83 | }
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| 84 | else
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| 85 | {
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| 86 | RTPrintf("Failed to read file entry %u of '%s': %Rrc\n", pszInput, i, rc);
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| 87 | break;
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| 88 | }
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| 89 |
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| 90 | offRead += sizeof(Entry);
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| 91 | }
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| 92 | }
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| 93 | else
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| 94 | {
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| 95 | rc = VERR_INVALID_MAGIC;
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| 96 | RTPrintf("The header contains invalid values\n");
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| 97 | }
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| 98 | }
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| 99 | else
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| 100 | RTPrintf("Failed to read header of '%s': %Rrc\n", pszInput, rc);
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| 101 |
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| 102 | RTFileClose(hFile);
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| 103 | }
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| 104 | else
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| 105 | RTPrintf("Failed to open file '%s': %Rrc\n", pszInput, rc);
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| 106 |
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| 107 | return rc;
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| 108 | }
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| 109 |
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| 110 |
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| 111 | static int efiFatExtractSave(const char *pszInput, uint32_t idxEntry, const char *pszOut)
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| 112 | {
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| 113 | RTFILE hFile = NIL_RTFILE;
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| 114 | int rc = RTFileOpen(&hFile, pszInput, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);
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| 115 | if (RT_SUCCESS(rc))
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| 116 | {
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| 117 | EFI_FATHDR Hdr;
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| 118 | rc = RTFileReadAt(hFile, 0, &Hdr, sizeof(Hdr), NULL);
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| 119 | if (RT_SUCCESS(rc))
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| 120 | {
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| 121 | if ( RT_LE2H_U32(Hdr.u32Magic) == EFI_FATHDR_MAGIC
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| 122 | && RT_LE2H_U32(Hdr.cFilesEmbedded) <= 16 /*Arbitrary number*/)
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| 123 | {
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| 124 | if (idxEntry < RT_LE2H_U32(Hdr.cFilesEmbedded))
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| 125 | {
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| 126 | EFI_FATDIRENTRY Entry;
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| 127 |
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| 128 | rc = RTFileReadAt(hFile, sizeof(Hdr) + idxEntry * sizeof(Entry), &Entry, sizeof(Entry), NULL);
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| 129 | if (RT_SUCCESS(rc))
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| 130 | {
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| 131 | void *pvFile = RTMemAllocZ(RT_LE2H_U32(Entry.cbFile));
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| 132 | if (RT_LIKELY(pvFile))
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| 133 | {
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| 134 | rc = RTFileReadAt(hFile, RT_LE2H_U32(Entry.u32OffsetStart), pvFile, RT_LE2H_U32(Entry.cbFile), NULL);
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| 135 | if (RT_SUCCESS(rc))
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| 136 | {
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| 137 | RTFILE hFileOut;
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| 138 | rc = RTFileOpen(&hFileOut, pszOut, RTFILE_O_WRITE | RTFILE_O_DENY_WRITE | RTFILE_O_CREATE);
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| 139 | if (RT_SUCCESS(rc))
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| 140 | {
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| 141 | rc = RTFileWrite(hFileOut, pvFile, RT_LE2H_U32(Entry.cbFile), NULL);
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| 142 | if (RT_FAILURE(rc))
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| 143 | RTPrintf("Failed to write output file '%s': %Rrc\n", pszOut, rc);
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| 144 | RTFileClose(hFileOut);
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| 145 | }
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| 146 | else
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| 147 | RTPrintf("Failed to create output file '%s': %Rrc\n", pszOut, rc);
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| 148 | }
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| 149 | else
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| 150 | RTPrintf("Failed to read embedded file %u: %Rrc\n", idxEntry, rc);
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| 151 |
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| 152 | RTMemFree(pvFile);
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| 153 | }
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| 154 | else
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| 155 | RTPrintf("Failed to allocate %u bytes of memory\n", RT_LE2H_U32(Entry.cbFile));
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| 156 | }
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| 157 | else
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| 158 | RTPrintf("Failed to read file entry %u of '%s': %Rrc\n", pszInput, idxEntry, rc);
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| 159 | }
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| 160 | else
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| 161 | {
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| 162 | rc = VERR_INVALID_PARAMETER;
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| 163 | RTPrintf("Given index out of range, maximum is %u\n", RT_LE2H_U32(Hdr.cFilesEmbedded));
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| 164 | }
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| 165 | }
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| 166 | else
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| 167 | {
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| 168 | rc = VERR_INVALID_MAGIC;
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| 169 | RTPrintf("The header contains invalid values\n");
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| 170 | }
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| 171 | }
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| 172 | else
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| 173 | RTPrintf("Failed to read header of '%s': %Rrc\n", pszInput, rc);
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| 174 |
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| 175 | RTFileClose(hFile);
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| 176 | }
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| 177 | else
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| 178 | RTPrintf("Failed to open file '%s': %Rrc\n", pszInput, rc);
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| 179 |
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| 180 | return rc;
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| 181 | }
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| 182 |
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| 183 |
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| 184 | int main(int argc, char **argv)
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| 185 | {
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| 186 | int rc = RTR3InitExe(argc, &argv, 0);
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| 187 | if (RT_FAILURE(rc))
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| 188 | return RTMsgInitFailure(rc);
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| 189 |
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| 190 | /*
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| 191 | * Parse arguments.
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| 192 | */
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| 193 | static const RTGETOPTDEF s_aOptions[] =
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| 194 | {
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| 195 | { "--input", 'i', RTGETOPT_REQ_STRING },
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| 196 | { "--output", 'o', RTGETOPT_REQ_STRING },
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| 197 | { "--entry", 'e', RTGETOPT_REQ_UINT32 },
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| 198 | { "--help", 'h', RTGETOPT_REQ_NOTHING },
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| 199 | { "--version", 'V', RTGETOPT_REQ_NOTHING },
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| 200 | };
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| 201 |
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| 202 | RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
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| 203 | const char *pszInput = NULL;
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| 204 | const char *pszOut = NULL;
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| 205 | uint32_t idxEntry = UINT32_C(0xffffffff);
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| 206 |
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| 207 | RTGETOPTUNION ValueUnion;
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| 208 | RTGETOPTSTATE GetState;
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| 209 | RTGetOptInit(&GetState, argc, argv, s_aOptions, RT_ELEMENTS(s_aOptions), 1, RTGETOPTINIT_FLAGS_OPTS_FIRST);
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| 210 | while ((rc = RTGetOpt(&GetState, &ValueUnion)))
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| 211 | {
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| 212 | switch (rc)
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| 213 | {
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| 214 | case 'h':
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| 215 | RTPrintf("Usage: %s [options]\n"
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| 216 | "\n"
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| 217 | "Options:\n"
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| 218 | " -i,--input=<file>\n"
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| 219 | " Input file\n"
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| 220 | " -e,--entry=<idx>\n"
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| 221 | " Selects the entry for saving\n"
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| 222 | " -o,--output=file\n"
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| 223 | " Save the specified entry to this file\n"
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| 224 | " -h, -?, --help\n"
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| 225 | " Display this help text and exit successfully.\n"
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| 226 | " -V, --version\n"
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| 227 | " Display the revision and exit successfully.\n"
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| 228 | , RTPathFilename(argv[0]));
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| 229 | return RTEXITCODE_SUCCESS;
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| 230 | case 'V':
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| 231 | RTPrintf("$Revision: 98103 $\n");
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| 232 | return RTEXITCODE_SUCCESS;
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| 233 |
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| 234 | case 'i':
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| 235 | pszInput = ValueUnion.psz;
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| 236 | break;
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| 237 | case 'o':
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| 238 | pszOut = ValueUnion.psz;
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| 239 | break;
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| 240 | case 'e':
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| 241 | idxEntry = ValueUnion.u32;
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| 242 | break;
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| 243 | default:
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| 244 | return RTGetOptPrintError(rc, &ValueUnion);
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| 245 | }
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| 246 | }
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| 247 |
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| 248 | if (!pszInput)
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| 249 | {
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| 250 | RTPrintf("An input path must be given\n");
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| 251 | return RTEXITCODE_FAILURE;
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| 252 | }
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| 253 |
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| 254 | if (!pszOut || idxEntry == UINT32_C(0xffffffff))
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| 255 | rc = efiFatExtractList(pszInput);
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| 256 | else
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| 257 | rc = efiFatExtractSave(pszInput, idxEntry, pszOut);
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| 258 | if (RT_FAILURE(rc))
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| 259 | rcExit = RTEXITCODE_FAILURE;
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| 260 |
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| 261 | return rcExit;
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| 262 | }
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| 263 |
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