| 1 | /* $Id: tar.h 69111 2017-10-17 14:26:02Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - TAR Virtual Filesystem.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2010-2017 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 | #ifndef __common_zip_tar_h
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| 28 | #define __common_zip_tar_h
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| 29 |
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| 30 | #include <iprt/assert.h>
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| 31 |
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| 32 | /** @name RTZIPTARHDRPOSIX::typeflag
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| 33 | * @{ */
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| 34 | #define RTZIPTAR_TF_OLDNORMAL '\0' /**< Normal disk file, Unix compatible */
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| 35 | #define RTZIPTAR_TF_NORMAL '0' /**< Normal disk file */
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| 36 | #define RTZIPTAR_TF_LINK '1' /**< Link to previously dumped file */
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| 37 | #define RTZIPTAR_TF_SYMLINK '2' /**< Symbolic link */
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| 38 | #define RTZIPTAR_TF_CHR '3' /**< Character special file */
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| 39 | #define RTZIPTAR_TF_BLK '4' /**< Block special file */
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| 40 | #define RTZIPTAR_TF_DIR '5' /**< Directory */
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| 41 | #define RTZIPTAR_TF_FIFO '6' /**< FIFO special file */
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| 42 | #define RTZIPTAR_TF_CONTIG '7' /**< Contiguous file */
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| 43 |
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| 44 | #define RTZIPTAR_TF_X_HDR 'x' /**< Extended header. */
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| 45 | #define RTZIPTAR_TF_X_GLOBAL 'g' /**< Global extended header. */
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| 46 |
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| 47 | #define RTZIPTAR_TF_SOLARIS_XHDR 'X'
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| 48 |
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| 49 | #define RTZIPTAR_TF_GNU_DUMPDIR 'D'
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| 50 | #define RTZIPTAR_TF_GNU_LONGLINK 'K' /**< GNU long link header. */
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| 51 | #define RTZIPTAR_TF_GNU_LONGNAME 'L' /**< GNU long name header. */
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| 52 | #define RTZIPTAR_TF_GNU_MULTIVOL 'M'
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| 53 | #define RTZIPTAR_TF_GNU_SPARSE 'S'
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| 54 | #define RTZIPTAR_TF_GNU_VOLDHR 'V'
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| 55 | /** @} */
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| 56 |
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| 57 |
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| 58 | /**
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| 59 | * The ancient tar header.
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| 60 | *
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| 61 | * The posix and gnu headers are compatible with the members up to and including
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| 62 | * link name, from there on they differ.
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| 63 | */
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| 64 | typedef struct RTZIPTARHDRANCIENT
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| 65 | {
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| 66 | char name[100];
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| 67 | char mode[8];
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| 68 | char uid[8];
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| 69 | char gid[8];
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| 70 | char size[12];
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| 71 | char mtime[12];
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| 72 | char chksum[8];
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| 73 | char typeflag;
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| 74 | char linkname[100]; /**< Was called linkflag. */
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| 75 | char unused[8+64+16+155+12];
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| 76 | } RTZIPTARHDRANCIENT;
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| 77 | AssertCompileSize(RTZIPTARHDRANCIENT, 512);
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| 78 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, name, 0);
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| 79 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, mode, 100);
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| 80 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, uid, 108);
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| 81 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, gid, 116);
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| 82 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, size, 124);
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| 83 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, mtime, 136);
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| 84 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, chksum, 148);
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| 85 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, typeflag, 156);
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| 86 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, linkname, 157);
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| 87 | AssertCompileMemberOffset(RTZIPTARHDRANCIENT, unused, 257);
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| 88 |
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| 89 |
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| 90 | /** The uniform standard tape archive format magic value. */
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| 91 | #define RTZIPTAR_USTAR_MAGIC "ustar"
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| 92 | /** The ustar version string.
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| 93 | * @remarks The terminator character is not part of the field. */
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| 94 | #define RTZIPTAR_USTAR_VERSION "00"
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| 95 |
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| 96 | /** The GNU magic + version value. */
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| 97 | #define RTZIPTAR_GNU_MAGIC "ustar "
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| 98 |
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| 99 |
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| 100 | /**
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| 101 | * The posix header (according to SuS).
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| 102 | */
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| 103 | typedef struct RTZIPTARHDRPOSIX
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| 104 | {
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| 105 | char name[100];
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| 106 | char mode[8];
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| 107 | char uid[8];
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| 108 | char gid[8];
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| 109 | char size[12];
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| 110 | char mtime[12];
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| 111 | char chksum[8];
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| 112 | char typeflag;
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| 113 | char linkname[100];
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| 114 | char magic[6];
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| 115 | char version[2];
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| 116 | char uname[32];
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| 117 | char gname[32];
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| 118 | char devmajor[8];
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| 119 | char devminor[8];
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| 120 | char prefix[155];
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| 121 | char unused[12];
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| 122 | } RTZIPTARHDRPOSIX;
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| 123 | AssertCompileSize(RTZIPTARHDRPOSIX, 512);
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| 124 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, name, 0);
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| 125 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, mode, 100);
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| 126 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, uid, 108);
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| 127 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, gid, 116);
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| 128 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, size, 124);
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| 129 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, mtime, 136);
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| 130 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, chksum, 148);
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| 131 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, typeflag, 156);
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| 132 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, linkname, 157);
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| 133 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, magic, 257);
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| 134 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, version, 263);
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| 135 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, uname, 265);
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| 136 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, gname, 297);
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| 137 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, devmajor, 329);
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| 138 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, devminor, 337);
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| 139 | AssertCompileMemberOffset(RTZIPTARHDRPOSIX, prefix, 345);
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| 140 |
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| 141 | /**
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| 142 | * GNU sparse data segment descriptor.
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| 143 | */
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| 144 | typedef struct RTZIPTARGNUSPARSE
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| 145 | {
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| 146 | char offset[12]; /**< Absolute offset relative to the start of the file. */
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| 147 | char numbytes[12];
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| 148 | } RTZIPTARGNUSPARSE;
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| 149 | AssertCompileSize(RTZIPTARGNUSPARSE, 24);
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| 150 | AssertCompileMemberOffset(RTZIPTARGNUSPARSE, offset, 0);
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| 151 | AssertCompileMemberOffset(RTZIPTARGNUSPARSE, numbytes, 12);
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| 152 | /** Pointer to a GNU sparse data segment descriptor. */
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| 153 | typedef RTZIPTARGNUSPARSE *PRTZIPTARGNUSPARSE;
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| 154 | /** Pointer to a const GNU sparse data segment descriptor. */
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| 155 | typedef RTZIPTARGNUSPARSE *PCRTZIPTARGNUSPARSE;
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| 156 |
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| 157 | /**
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| 158 | * The GNU header.
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| 159 | */
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| 160 | typedef struct RTZIPTARHDRGNU
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| 161 | {
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| 162 | char name[100];
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| 163 | char mode[8];
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| 164 | char uid[8];
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| 165 | char gid[8];
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| 166 | char size[12];
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| 167 | char mtime[12];
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| 168 | char chksum[8];
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| 169 | char typeflag;
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| 170 | char linkname[100];
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| 171 | char magic[8];
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| 172 | char uname[32];
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| 173 | char gname[32];
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| 174 | char devmajor[8];
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| 175 | char devminor[8];
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| 176 | char atime[12];
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| 177 | char ctime[12];
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| 178 | char offset[12]; /**< for multi-volume? */
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| 179 | char longnames[4]; /**< Seems to be unused. */
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| 180 | char unused[1];
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| 181 | RTZIPTARGNUSPARSE sparse[4];
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| 182 | char isextended; /**< More headers about sparse stuff if binary value 1. */
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| 183 | char realsize[12];
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| 184 | char unused2[17];
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| 185 | } RTZIPTARHDRGNU;
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| 186 | AssertCompileSize(RTZIPTARHDRGNU, 512);
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| 187 | AssertCompileMemberOffset(RTZIPTARHDRGNU, name, 0);
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| 188 | AssertCompileMemberOffset(RTZIPTARHDRGNU, mode, 100);
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| 189 | AssertCompileMemberOffset(RTZIPTARHDRGNU, uid, 108);
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| 190 | AssertCompileMemberOffset(RTZIPTARHDRGNU, gid, 116);
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| 191 | AssertCompileMemberOffset(RTZIPTARHDRGNU, size, 124);
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| 192 | AssertCompileMemberOffset(RTZIPTARHDRGNU, mtime, 136);
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| 193 | AssertCompileMemberOffset(RTZIPTARHDRGNU, chksum, 148);
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| 194 | AssertCompileMemberOffset(RTZIPTARHDRGNU, typeflag, 156);
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| 195 | AssertCompileMemberOffset(RTZIPTARHDRGNU, linkname, 157);
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| 196 | AssertCompileMemberOffset(RTZIPTARHDRGNU, magic, 257);
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| 197 | AssertCompileMemberOffset(RTZIPTARHDRGNU, uname, 265);
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| 198 | AssertCompileMemberOffset(RTZIPTARHDRGNU, gname, 297);
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| 199 | AssertCompileMemberOffset(RTZIPTARHDRGNU, devmajor, 329);
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| 200 | AssertCompileMemberOffset(RTZIPTARHDRGNU, devminor, 337);
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| 201 | AssertCompileMemberOffset(RTZIPTARHDRGNU, atime, 345);
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| 202 | AssertCompileMemberOffset(RTZIPTARHDRGNU, ctime, 357);
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| 203 | AssertCompileMemberOffset(RTZIPTARHDRGNU, offset, 369);
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| 204 | AssertCompileMemberOffset(RTZIPTARHDRGNU, longnames, 381);
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| 205 | AssertCompileMemberOffset(RTZIPTARHDRGNU, unused, 385);
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| 206 | AssertCompileMemberOffset(RTZIPTARHDRGNU, sparse, 386);
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| 207 | AssertCompileMemberOffset(RTZIPTARHDRGNU, isextended,482);
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| 208 | AssertCompileMemberOffset(RTZIPTARHDRGNU, realsize, 483);
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| 209 | AssertCompileMemberOffset(RTZIPTARHDRGNU, unused2, 495);
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| 210 |
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| 211 |
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| 212 | /**
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| 213 | * GNU sparse header.
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| 214 | */
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| 215 | typedef struct RTZIPTARHDRGNUSPARSE
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| 216 | {
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| 217 | RTZIPTARGNUSPARSE sp[21];
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| 218 | char isextended;
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| 219 | char unused[7];
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| 220 | } RTZIPTARHDRGNUSPARSE;
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| 221 | AssertCompileSize(RTZIPTARHDRGNUSPARSE, 512);
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| 222 | AssertCompileMemberOffset(RTZIPTARHDRGNUSPARSE, sp, 0);
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| 223 | AssertCompileMemberOffset(RTZIPTARHDRGNUSPARSE, isextended, 504);
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| 224 | AssertCompileMemberOffset(RTZIPTARHDRGNUSPARSE, unused, 505);
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| 225 |
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| 226 |
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| 227 | /**
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| 228 | * The bits common to posix and GNU.
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| 229 | */
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| 230 | typedef struct RTZIPTARHDRCOMMON
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| 231 | {
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| 232 | char name[100];
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| 233 | char mode[8];
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| 234 | char uid[8];
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| 235 | char gid[8];
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| 236 | char size[12];
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| 237 | char mtime[12];
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| 238 | char chksum[8];
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| 239 | char typeflag;
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| 240 | char linkname[100];
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| 241 | char magic[6];
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| 242 | char version[2];
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| 243 | char uname[32];
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| 244 | char gname[32];
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| 245 | char devmajor[8];
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| 246 | char devminor[8];
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| 247 | char not_common[155+12];
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| 248 | } RTZIPTARHDRCOMMON;
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| 249 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, name, RTZIPTARHDRPOSIX, name);
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| 250 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, mode, RTZIPTARHDRPOSIX, mode);
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| 251 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, uid, RTZIPTARHDRPOSIX, uid);
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| 252 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, gid, RTZIPTARHDRPOSIX, gid);
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| 253 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, size, RTZIPTARHDRPOSIX, size);
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| 254 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, mtime, RTZIPTARHDRPOSIX, mtime);
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| 255 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, chksum, RTZIPTARHDRPOSIX, chksum);
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| 256 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, typeflag, RTZIPTARHDRPOSIX, typeflag);
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| 257 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, linkname, RTZIPTARHDRPOSIX, linkname);
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| 258 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, magic, RTZIPTARHDRPOSIX, magic);
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| 259 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, version, RTZIPTARHDRPOSIX, version);
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| 260 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, uname, RTZIPTARHDRPOSIX, uname);
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| 261 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, gname, RTZIPTARHDRPOSIX, gname);
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| 262 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, devmajor, RTZIPTARHDRPOSIX, devmajor);
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| 263 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, devminor, RTZIPTARHDRPOSIX, devminor);
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| 264 |
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| 265 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, name, RTZIPTARHDRGNU, name);
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| 266 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, mode, RTZIPTARHDRGNU, mode);
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| 267 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, uid, RTZIPTARHDRGNU, uid);
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| 268 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, gid, RTZIPTARHDRGNU, gid);
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| 269 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, size, RTZIPTARHDRGNU, size);
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| 270 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, mtime, RTZIPTARHDRGNU, mtime);
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| 271 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, chksum, RTZIPTARHDRGNU, chksum);
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| 272 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, typeflag, RTZIPTARHDRGNU, typeflag);
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| 273 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, linkname, RTZIPTARHDRGNU, linkname);
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| 274 | AssertCompileMembersAtSameOffset( RTZIPTARHDRCOMMON, magic, RTZIPTARHDRGNU, magic);
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| 275 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, uname, RTZIPTARHDRGNU, uname);
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| 276 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, gname, RTZIPTARHDRGNU, gname);
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| 277 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, devmajor, RTZIPTARHDRGNU, devmajor);
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| 278 | AssertCompileMembersSameSizeAndOffset(RTZIPTARHDRCOMMON, devminor, RTZIPTARHDRGNU, devminor);
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| 279 |
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| 280 |
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| 281 |
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| 282 | /**
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| 283 | * Tar header union.
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| 284 | */
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| 285 | typedef union RTZIPTARHDR
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| 286 | {
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| 287 | /** Byte view. */
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| 288 | char ab[512];
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| 289 | /** The standard header. */
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| 290 | RTZIPTARHDRANCIENT Ancient;
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| 291 | /** The standard header. */
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| 292 | RTZIPTARHDRPOSIX Posix;
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| 293 | /** The GNU header. */
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| 294 | RTZIPTARHDRGNU Gnu;
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| 295 | /** The bits common to both GNU and the standard header. */
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| 296 | RTZIPTARHDRCOMMON Common;
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| 297 | /** GNU sparse header. */
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| 298 | RTZIPTARHDRGNUSPARSE GnuSparse;
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| 299 | } RTZIPTARHDR;
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| 300 | AssertCompileSize(RTZIPTARHDR, 512);
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| 301 | /** Pointer to a tar file header. */
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| 302 | typedef RTZIPTARHDR *PRTZIPTARHDR;
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| 303 | /** Pointer to a const tar file header. */
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| 304 | typedef RTZIPTARHDR const *PCRTZIPTARHDR;
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| 305 |
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| 306 |
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| 307 | /**
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| 308 | * Tar header type.
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| 309 | */
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| 310 | typedef enum RTZIPTARTYPE
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| 311 | {
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| 312 | /** Invalid type value. */
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| 313 | RTZIPTARTYPE_INVALID = 0,
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| 314 | /** Posix header. */
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| 315 | RTZIPTARTYPE_POSIX,
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| 316 | /** The old GNU header, has layout conflicting with posix. */
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| 317 | RTZIPTARTYPE_GNU,
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| 318 | /** Ancient tar header which does not use anything beyond the magic. */
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| 319 | RTZIPTARTYPE_ANCIENT,
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| 320 | /** End of the valid type values (this is not valid). */
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| 321 | RTZIPTARTYPE_END,
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| 322 | /** The usual type blow up. */
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| 323 | RTZIPTARTYPE_32BIT_HACK = 0x7fffffff
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| 324 | } RTZIPTARTYPE;
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| 325 | typedef RTZIPTARTYPE *PRTZIPTARTYPE;
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| 326 |
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| 327 |
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| 328 | /**
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| 329 | * Calculates the TAR header checksums and detects if it's all zeros.
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| 330 | *
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| 331 | * @returns true if all zeros, false if not.
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| 332 | * @param pHdr The header to checksum.
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| 333 | * @param pi32Unsigned Where to store the checksum calculated using
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| 334 | * unsigned chars. This is the one POSIX specifies.
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| 335 | * @param pi32Signed Where to store the checksum calculated using
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| 336 | * signed chars.
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| 337 | *
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| 338 | * @remarks The reason why we calculate the checksum as both signed and unsigned
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| 339 | * has to do with various the char C type being signed on some hosts
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| 340 | * and unsigned on others.
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| 341 | */
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| 342 | DECLINLINE(bool) rtZipTarCalcChkSum(PCRTZIPTARHDR pHdr, int32_t *pi32Unsigned, int32_t *pi32Signed)
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| 343 | {
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| 344 | int32_t i32Unsigned = 0;
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| 345 | int32_t i32Signed = 0;
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| 346 |
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| 347 | /*
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| 348 | * Sum up the entire header.
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| 349 | */
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| 350 | const char *pch = (const char *)pHdr;
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| 351 | const char *pchEnd = pch + sizeof(*pHdr);
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| 352 | do
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| 353 | {
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| 354 | i32Unsigned += *(unsigned char *)pch;
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| 355 | i32Signed += *(signed char *)pch;
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| 356 | } while (++pch != pchEnd);
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| 357 |
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| 358 | /*
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| 359 | * Check if it's all zeros and replace the chksum field with spaces.
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| 360 | */
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| 361 | bool const fZeroHdr = i32Unsigned == 0;
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| 362 |
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| 363 | pch = pHdr->Common.chksum;
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| 364 | pchEnd = pch + sizeof(pHdr->Common.chksum);
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| 365 | do
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| 366 | {
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| 367 | i32Unsigned -= *(unsigned char *)pch;
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| 368 | i32Signed -= *(signed char *)pch;
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| 369 | } while (++pch != pchEnd);
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| 370 |
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| 371 | i32Unsigned += (unsigned char)' ' * sizeof(pHdr->Common.chksum);
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| 372 | i32Signed += (signed char)' ' * sizeof(pHdr->Common.chksum);
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| 373 |
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| 374 | *pi32Unsigned = i32Unsigned;
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| 375 | if (pi32Signed)
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| 376 | *pi32Signed = i32Signed;
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| 377 | return fZeroHdr;
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| 378 | }
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| 379 |
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| 380 |
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| 381 | #endif
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| 382 |
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