| 1 | /* $Id: fs.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - File System.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2023 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/fs.h>
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| 42 | #include "internal/iprt.h"
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| 43 |
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| 44 | #include <iprt/asm.h>
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| 45 | #include <iprt/assert.h>
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| 46 | #include <iprt/ctype.h>
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| 47 | #include <iprt/path.h>
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| 48 | #include <iprt/string.h>
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| 49 | #include <iprt/time.h>
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| 50 | #include "internal/fs.h"
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| 51 |
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| 52 |
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| 53 | /**
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| 54 | * Converts dos-style attributes to Unix attributes.
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| 55 | *
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| 56 | * @returns Normalized mode mask.
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| 57 | * @param fMode The mode mask containing dos-style attributes only.
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| 58 | * @param pszName The filename which this applies to (exe check).
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| 59 | * @param cbName The length of that filename. (optional, set 0)
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| 60 | * @param uReparseTag The reparse tag if RTFS_DOS_NT_REPARSE_POINT is set.
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| 61 | * @param fType RTFS_TYPE_XXX to normalize against, 0 if not known.
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| 62 | */
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| 63 | RTFMODE rtFsModeFromDos(RTFMODE fMode, const char *pszName, size_t cbName, uint32_t uReparseTag, RTFMODE fType)
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| 64 | {
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| 65 | Assert(!(fType & ~RTFS_TYPE_MASK));
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| 66 |
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| 67 | fMode &= ~((1 << RTFS_DOS_SHIFT) - 1);
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| 68 |
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| 69 | /* Forcibly set the directory attribute if caller desires it. */
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| 70 | if (fType == RTFS_TYPE_DIRECTORY)
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| 71 | fMode |= RTFS_DOS_DIRECTORY;
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| 72 |
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| 73 | /* Everything is readable. */
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| 74 | fMode |= RTFS_UNIX_IRUSR | RTFS_UNIX_IRGRP | RTFS_UNIX_IROTH;
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| 75 | if (fMode & RTFS_DOS_DIRECTORY)
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| 76 | /* Directories are executable. */
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| 77 | fMode |= RTFS_TYPE_DIRECTORY | RTFS_UNIX_IXUSR | RTFS_UNIX_IXGRP | RTFS_UNIX_IXOTH;
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| 78 | else
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| 79 | {
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| 80 | fMode |= RTFS_TYPE_FILE;
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| 81 | if (!cbName && pszName)
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| 82 | cbName = strlen(pszName);
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| 83 | if (cbName >= 4 && pszName[cbName - 4] == '.')
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| 84 | {
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| 85 | /* check for executable extension. */
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| 86 | const char *pszExt = &pszName[cbName - 3];
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| 87 | char szExt[4];
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| 88 | szExt[0] = RT_C_TO_LOWER(pszExt[0]);
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| 89 | szExt[1] = RT_C_TO_LOWER(pszExt[1]);
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| 90 | szExt[2] = RT_C_TO_LOWER(pszExt[2]);
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| 91 | szExt[3] = '\0';
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| 92 | if ( !memcmp(szExt, "exe", 4)
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| 93 | || !memcmp(szExt, "bat", 4)
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| 94 | || !memcmp(szExt, "com", 4)
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| 95 | || !memcmp(szExt, "cmd", 4)
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| 96 | || !memcmp(szExt, "btm", 4)
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| 97 | )
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| 98 | fMode |= RTFS_UNIX_IXUSR | RTFS_UNIX_IXGRP | RTFS_UNIX_IXOTH;
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | /* Is it really a symbolic link? */
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| 103 | if ((fMode & RTFS_DOS_NT_REPARSE_POINT) && uReparseTag == RTFSMODE_SYMLINK_REPARSE_TAG)
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| 104 | fMode = (fMode & ~RTFS_TYPE_MASK) | RTFS_TYPE_SYMLINK;
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| 105 |
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| 106 | /*
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| 107 | * Writable?
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| 108 | *
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| 109 | * Note! We ignore the read-only flag on directories as windows seems to
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| 110 | * use it for purposes other than writability (@ticketref{18345}):
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| 111 | * https://support.microsoft.com/en-gb/help/326549/you-cannot-view-or-change-the-read-only-or-the-system-attributes-of-fo
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| 112 | *
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| 113 | */
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| 114 | if ((fMode & (RTFS_DOS_DIRECTORY | RTFS_DOS_READONLY)) != RTFS_DOS_READONLY)
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| 115 | fMode |= RTFS_UNIX_IWUSR | RTFS_UNIX_IWGRP | RTFS_UNIX_IWOTH;
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| 116 | return fMode;
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| 117 | }
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| 118 |
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| 119 |
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| 120 | /**
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| 121 | * Converts Unix attributes to Dos-style attributes.
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| 122 | *
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| 123 | * @returns File mode mask.
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| 124 | * @param fMode The mode mask containing dos-style attributes only.
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| 125 | * @param pszName The filename which this applies to (hidden check).
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| 126 | * @param cbName The length of that filename. (optional, set 0)
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| 127 | * @param fType RTFS_TYPE_XXX to normalize against, 0 if not known.
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| 128 | */
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| 129 | RTFMODE rtFsModeFromUnix(RTFMODE fMode, const char *pszName, size_t cbName, RTFMODE fType)
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| 130 | {
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| 131 | Assert(!(fType & ~RTFS_TYPE_MASK));
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| 132 | NOREF(cbName);
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| 133 |
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| 134 | fMode &= RTFS_UNIX_MASK;
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| 135 |
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| 136 | if (!(fType & RTFS_TYPE_MASK) && fType)
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| 137 | fMode |= fType;
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| 138 |
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| 139 | if (!(fMode & (RTFS_UNIX_IWUSR | RTFS_UNIX_IWGRP | RTFS_UNIX_IWOTH)))
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| 140 | fMode |= RTFS_DOS_READONLY;
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| 141 | if (RTFS_IS_DIRECTORY(fMode))
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| 142 | fMode |= RTFS_DOS_DIRECTORY;
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| 143 | if (!(fMode & RTFS_DOS_MASK))
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| 144 | fMode |= RTFS_DOS_NT_NORMAL;
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| 145 | if (!(fMode & RTFS_DOS_HIDDEN) && pszName)
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| 146 | {
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| 147 | pszName = RTPathFilename(pszName);
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| 148 | if ( pszName
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| 149 | && pszName[0] == '.'
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| 150 | && pszName[1] != '\0' /* exclude "." */
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| 151 | && (pszName[1] != '.' || pszName[2] != '\0')) /* exclude ".." */
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| 152 | fMode |= RTFS_DOS_HIDDEN;
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| 153 | }
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| 154 | return fMode;
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| 155 | }
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| 156 |
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| 157 |
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| 158 | /**
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| 159 | * Normalizes the give mode mask.
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| 160 | *
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| 161 | * It will create the missing unix or dos mask from the other (one
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| 162 | * of them is required by all APIs), and guess the file type if that's
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| 163 | * missing.
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| 164 | *
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| 165 | * @returns Normalized file mode.
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| 166 | * @param fMode The mode mask that may contain a partial/incomplete mask.
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| 167 | * @param pszName The filename which this applies to (exe check).
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| 168 | * @param cbName The length of that filename. (optional, set 0)
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| 169 | * @param fType RTFS_TYPE_XXX to normalize against, 0 if not known.
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| 170 | */
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| 171 | RTFMODE rtFsModeNormalize(RTFMODE fMode, const char *pszName, size_t cbName, RTFMODE fType)
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| 172 | {
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| 173 | Assert(!(fType & ~RTFS_TYPE_MASK));
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| 174 |
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| 175 | if (!(fMode & RTFS_UNIX_MASK))
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| 176 | fMode = rtFsModeFromDos(fMode, pszName, cbName, RTFSMODE_SYMLINK_REPARSE_TAG, fType);
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| 177 | else if (!(fMode & RTFS_DOS_MASK))
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| 178 | fMode = rtFsModeFromUnix(fMode, pszName, cbName, fType);
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| 179 | else if (!(fMode & RTFS_TYPE_MASK))
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| 180 | fMode |= fMode & RTFS_DOS_DIRECTORY ? RTFS_TYPE_DIRECTORY : RTFS_TYPE_FILE;
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| 181 | else if (RTFS_IS_DIRECTORY(fMode))
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| 182 | fMode |= RTFS_DOS_DIRECTORY;
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| 183 | return fMode;
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| 184 | }
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| 185 |
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| 186 |
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| 187 | /**
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| 188 | * Checks if the file mode is valid or not.
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| 189 | *
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| 190 | * @return true if valid.
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| 191 | * @return false if invalid, done bitching.
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| 192 | * @param fMode The file mode.
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| 193 | */
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| 194 | bool rtFsModeIsValid(RTFMODE fMode)
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| 195 | {
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| 196 | AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
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| 197 | || (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
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| 198 | ("%RTfmode\n", fMode), false);
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| 199 | AssertMsgReturn(RTFS_TYPE_MASK & fMode,
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| 200 | ("%RTfmode\n", fMode), false);
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| 201 | /** @todo more checks! */
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| 202 | return true;
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| 203 | }
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| 204 |
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| 205 |
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| 206 | /**
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| 207 | * Checks if the file mode is valid as a permission mask or not.
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| 208 | *
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| 209 | * @return true if valid.
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| 210 | * @return false if invalid, done bitching.
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| 211 | * @param fMode The file mode.
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| 212 | */
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| 213 | bool rtFsModeIsValidPermissions(RTFMODE fMode)
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| 214 | {
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| 215 | AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
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| 216 | || (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
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| 217 | ("%RTfmode\n", fMode), false);
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| 218 | /** @todo more checks! */
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| 219 | return true;
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| 220 | }
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| 221 |
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| 222 |
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| 223 | RTDECL(const char *) RTFsTypeName(RTFSTYPE enmType)
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| 224 | {
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| 225 | switch (enmType)
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| 226 | {
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| 227 | case RTFSTYPE_UNKNOWN: return "unknown";
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| 228 | case RTFSTYPE_UDF: return "udf";
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| 229 | case RTFSTYPE_ISO9660: return "iso9660";
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| 230 | case RTFSTYPE_FUSE: return "fuse";
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| 231 | case RTFSTYPE_VBOXSHF: return "vboxshf";
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| 232 |
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| 233 | case RTFSTYPE_EXT: return "ext";
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| 234 | case RTFSTYPE_EXT2: return "ext2";
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| 235 | case RTFSTYPE_EXT3: return "ext3";
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| 236 | case RTFSTYPE_EXT4: return "ext4";
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| 237 | case RTFSTYPE_XFS: return "xfs";
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| 238 | case RTFSTYPE_CIFS: return "cifs";
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| 239 | case RTFSTYPE_SMBFS: return "smbfs";
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| 240 | case RTFSTYPE_TMPFS: return "tmpfs";
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| 241 | case RTFSTYPE_SYSFS: return "sysfs";
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| 242 | case RTFSTYPE_PROC: return "proc";
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| 243 | case RTFSTYPE_OCFS2: return "ocfs2";
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| 244 | case RTFSTYPE_BTRFS: return "btrfs";
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| 245 |
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| 246 | case RTFSTYPE_NTFS: return "ntfs";
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| 247 | case RTFSTYPE_FAT: return "fat";
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| 248 | case RTFSTYPE_EXFAT: return "exfat";
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| 249 | case RTFSTYPE_REFS: return "refs";
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| 250 |
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| 251 | case RTFSTYPE_ZFS: return "zfs";
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| 252 | case RTFSTYPE_UFS: return "ufs";
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| 253 | case RTFSTYPE_NFS: return "nfs";
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| 254 |
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| 255 | case RTFSTYPE_HFS: return "hfs";
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| 256 | case RTFSTYPE_APFS: return "apfs";
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| 257 | case RTFSTYPE_AUTOFS: return "autofs";
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| 258 | case RTFSTYPE_DEVFS: return "devfs";
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| 259 |
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| 260 | case RTFSTYPE_HPFS: return "hpfs";
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| 261 | case RTFSTYPE_JFS: return "jfs";
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| 262 |
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| 263 | case RTFSTYPE_END: return "end";
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| 264 | case RTFSTYPE_32BIT_HACK: break;
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| 265 | }
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| 266 |
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| 267 | /* Don't put this in as 'default:', we wish GCC to warn about missing cases. */
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| 268 | static char s_asz[4][64];
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| 269 | static uint32_t volatile s_i = 0;
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| 270 | uint32_t i = ASMAtomicIncU32(&s_i) % RT_ELEMENTS(s_asz);
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| 271 | RTStrPrintf(s_asz[i], sizeof(s_asz[i]), "type=%d", enmType);
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| 272 | return s_asz[i];
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| 273 | }
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| 274 |
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