| 1 | /* $Id: fs.cpp 69111 2017-10-17 14:26:02Z 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) 2006-2017 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 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/fs.h>
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| 32 | #include "internal/iprt.h"
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| 33 |
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| 34 | #include <iprt/asm.h>
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/ctype.h>
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| 37 | #include <iprt/path.h>
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| 38 | #include <iprt/string.h>
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| 39 | #include <iprt/time.h>
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| 40 | #include "internal/fs.h"
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| 41 |
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| 42 |
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| 43 | /**
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| 44 | * Converts dos-style attributes to Unix attributes.
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| 45 | *
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| 46 | * @returns
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| 47 | * @param fMode The mode mask containing dos-style attributes only.
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| 48 | * @param pszName The filename which this applies to (exe check).
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| 49 | * @param cbName The length of that filename. (optional, set 0)
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| 50 | * @param uReparseTag The reparse tag if RTFS_DOS_NT_REPARSE_POINT is set.
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| 51 | */
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| 52 | RTFMODE rtFsModeFromDos(RTFMODE fMode, const char *pszName, size_t cbName, uint32_t uReparseTag)
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| 53 | {
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| 54 | fMode &= ~((1 << RTFS_DOS_SHIFT) - 1);
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| 55 |
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| 56 | /* everything is readable. */
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| 57 | fMode |= RTFS_UNIX_IRUSR | RTFS_UNIX_IRGRP | RTFS_UNIX_IROTH;
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| 58 | if (fMode & RTFS_DOS_DIRECTORY)
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| 59 | /* directories are executable. */
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| 60 | fMode |= RTFS_TYPE_DIRECTORY | RTFS_UNIX_IXUSR | RTFS_UNIX_IXGRP | RTFS_UNIX_IXOTH;
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| 61 | else
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| 62 | {
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| 63 | fMode |= RTFS_TYPE_FILE;
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| 64 | if (!cbName && pszName)
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| 65 | cbName = strlen(pszName);
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| 66 | if (cbName >= 4 && pszName[cbName - 4] == '.')
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| 67 | {
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| 68 | /* check for executable extension. */
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| 69 | const char *pszExt = &pszName[cbName - 3];
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| 70 | char szExt[4];
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| 71 | szExt[0] = RT_C_TO_LOWER(pszExt[0]);
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| 72 | szExt[1] = RT_C_TO_LOWER(pszExt[1]);
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| 73 | szExt[2] = RT_C_TO_LOWER(pszExt[2]);
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| 74 | szExt[3] = '\0';
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| 75 | if ( !memcmp(szExt, "exe", 4)
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| 76 | || !memcmp(szExt, "bat", 4)
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| 77 | || !memcmp(szExt, "com", 4)
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| 78 | || !memcmp(szExt, "cmd", 4)
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| 79 | || !memcmp(szExt, "btm", 4)
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| 80 | )
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| 81 | fMode |= RTFS_UNIX_IXUSR | RTFS_UNIX_IXGRP | RTFS_UNIX_IXOTH;
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| 82 | }
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| 83 | }
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| 84 |
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| 85 | /* Is it really a symbolic link? */
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| 86 | if ((fMode & RTFS_DOS_NT_REPARSE_POINT) && uReparseTag == RTFSMODE_SYMLINK_REPARSE_TAG)
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| 87 | fMode = (fMode & ~RTFS_TYPE_MASK) | RTFS_TYPE_SYMLINK;
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| 88 |
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| 89 | /* writable? */
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| 90 | if (!(fMode & RTFS_DOS_READONLY))
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| 91 | fMode |= RTFS_UNIX_IWUSR | RTFS_UNIX_IWGRP | RTFS_UNIX_IWOTH;
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| 92 | return fMode;
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| 93 | }
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| 94 |
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| 95 |
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| 96 | /**
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| 97 | * Converts Unix attributes to Dos-style attributes.
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| 98 | *
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| 99 | * @returns File mode mask.
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| 100 | * @param fMode The mode mask containing dos-style attributes only.
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| 101 | * @param pszName The filename which this applies to (hidden check).
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| 102 | * @param cbName The length of that filename. (optional, set 0)
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| 103 | */
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| 104 | RTFMODE rtFsModeFromUnix(RTFMODE fMode, const char *pszName, size_t cbName)
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| 105 | {
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| 106 | NOREF(cbName);
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| 107 |
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| 108 | fMode &= RTFS_UNIX_MASK;
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| 109 |
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| 110 | if (!(fMode & (RTFS_UNIX_IWUSR | RTFS_UNIX_IWGRP | RTFS_UNIX_IWOTH)))
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| 111 | fMode |= RTFS_DOS_READONLY;
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| 112 | if (RTFS_IS_DIRECTORY(fMode))
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| 113 | fMode |= RTFS_DOS_DIRECTORY;
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| 114 | if (!(fMode & RTFS_DOS_MASK))
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| 115 | fMode |= RTFS_DOS_NT_NORMAL;
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| 116 | if (!(fMode & RTFS_DOS_HIDDEN) && pszName)
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| 117 | {
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| 118 | pszName = RTPathFilename(pszName);
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| 119 | if (pszName && *pszName == '.')
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| 120 | fMode |= RTFS_DOS_HIDDEN;
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| 121 | }
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| 122 | return fMode;
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| 123 | }
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| 124 |
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| 125 |
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| 126 | /**
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| 127 | * Normalizes the give mode mask.
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| 128 | *
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| 129 | * It will create the missing unix or dos mask from the other (one
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| 130 | * of them is required by all APIs), and guess the file type if that's
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| 131 | * missing.
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| 132 | *
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| 133 | * @returns Normalized file mode.
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| 134 | * @param fMode The mode mask that may contain a partial/incomplete mask.
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| 135 | * @param pszName The filename which this applies to (exe check).
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| 136 | * @param cbName The length of that filename. (optional, set 0)
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| 137 | */
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| 138 | RTFMODE rtFsModeNormalize(RTFMODE fMode, const char *pszName, size_t cbName)
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| 139 | {
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| 140 | if (!(fMode & RTFS_UNIX_MASK))
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| 141 | fMode = rtFsModeFromDos(fMode, pszName, cbName, RTFSMODE_SYMLINK_REPARSE_TAG);
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| 142 | else if (!(fMode & RTFS_DOS_MASK))
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| 143 | fMode = rtFsModeFromUnix(fMode, pszName, cbName);
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| 144 | else if (!(fMode & RTFS_TYPE_MASK))
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| 145 | fMode |= fMode & RTFS_DOS_DIRECTORY ? RTFS_TYPE_DIRECTORY : RTFS_TYPE_FILE;
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| 146 | else if (RTFS_IS_DIRECTORY(fMode))
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| 147 | fMode |= RTFS_DOS_DIRECTORY;
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| 148 | return fMode;
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| 149 | }
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| 150 |
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| 151 |
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| 152 | /**
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| 153 | * Checks if the file mode is valid or not.
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| 154 | *
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| 155 | * @return true if valid.
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| 156 | * @return false if invalid, done bitching.
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| 157 | * @param fMode The file mode.
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| 158 | */
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| 159 | bool rtFsModeIsValid(RTFMODE fMode)
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| 160 | {
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| 161 | AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
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| 162 | || (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
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| 163 | ("%RTfmode\n", fMode), false);
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| 164 | AssertMsgReturn(RTFS_TYPE_MASK & fMode,
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| 165 | ("%RTfmode\n", fMode), false);
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| 166 | /** @todo more checks! */
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| 167 | return true;
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| 168 | }
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| 169 |
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| 170 |
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| 171 | /**
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| 172 | * Checks if the file mode is valid as a permission mask or not.
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| 173 | *
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| 174 | * @return true if valid.
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| 175 | * @return false if invalid, done bitching.
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| 176 | * @param fMode The file mode.
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| 177 | */
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| 178 | bool rtFsModeIsValidPermissions(RTFMODE fMode)
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| 179 | {
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| 180 | AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
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| 181 | || (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
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| 182 | ("%RTfmode\n", fMode), false);
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| 183 | /** @todo more checks! */
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| 184 | return true;
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| 185 | }
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| 186 |
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| 187 |
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| 188 | RTDECL(const char *) RTFsTypeName(RTFSTYPE enmType)
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| 189 | {
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| 190 | switch (enmType)
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| 191 | {
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| 192 | case RTFSTYPE_UNKNOWN: return "unknown";
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| 193 | case RTFSTYPE_UDF: return "udf";
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| 194 | case RTFSTYPE_ISO9660: return "iso9660";
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| 195 | case RTFSTYPE_FUSE: return "fuse";
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| 196 | case RTFSTYPE_VBOXSHF: return "vboxshf";
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| 197 |
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| 198 | case RTFSTYPE_EXT: return "ext";
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| 199 | case RTFSTYPE_EXT2: return "ext2";
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| 200 | case RTFSTYPE_EXT3: return "ext3";
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| 201 | case RTFSTYPE_EXT4: return "ext4";
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| 202 | case RTFSTYPE_XFS: return "xfs";
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| 203 | case RTFSTYPE_CIFS: return "cifs";
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| 204 | case RTFSTYPE_SMBFS: return "smbfs";
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| 205 | case RTFSTYPE_TMPFS: return "tmpfs";
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| 206 | case RTFSTYPE_SYSFS: return "sysfs";
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| 207 | case RTFSTYPE_PROC: return "proc";
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| 208 | case RTFSTYPE_OCFS2: return "ocfs2";
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| 209 | case RTFSTYPE_BTRFS: return "btrfs";
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| 210 |
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| 211 | case RTFSTYPE_NTFS: return "ntfs";
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| 212 | case RTFSTYPE_FAT: return "fat";
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| 213 | case RTFSTYPE_EXFAT: return "exfat";
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| 214 |
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| 215 | case RTFSTYPE_ZFS: return "zfs";
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| 216 | case RTFSTYPE_UFS: return "ufs";
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| 217 | case RTFSTYPE_NFS: return "nfs";
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| 218 |
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| 219 | case RTFSTYPE_HFS: return "hfs";
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| 220 | case RTFSTYPE_AUTOFS: return "autofs";
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| 221 | case RTFSTYPE_DEVFS: return "devfs";
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| 222 |
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| 223 | case RTFSTYPE_HPFS: return "hpfs";
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| 224 | case RTFSTYPE_JFS: return "jfs";
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| 225 |
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| 226 | case RTFSTYPE_END: return "end";
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| 227 | case RTFSTYPE_32BIT_HACK: break;
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| 228 | }
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| 229 |
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| 230 | /* Don't put this in as 'default:', we wish GCC to warn about missing cases. */
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| 231 | static char s_asz[4][64];
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| 232 | static uint32_t volatile s_i = 0;
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| 233 | uint32_t i = ASMAtomicIncU32(&s_i) % RT_ELEMENTS(s_asz);
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| 234 | RTStrPrintf(s_asz[i], sizeof(s_asz[i]), "type=%d", enmType);
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| 235 | return s_asz[i];
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| 236 | }
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| 237 |
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