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/* $Id: fs.cpp $ */
/** @file
* IPRT - File System.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/fs.h>
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/ctype.h>
#include <iprt/path.h>
#include <iprt/string.h>
#include <iprt/time.h>
#include "internal/fs.h"
/**
* Converts dos-style attributes to Unix attributes.
*
* @returns Normalized mode mask.
* @param fMode The mode mask containing dos-style attributes only.
* @param pszName The filename which this applies to (exe check).
* @param cbName The length of that filename. (optional, set 0)
* @param uReparseTag The reparse tag if RTFS_DOS_NT_REPARSE_POINT is set.
* @param fType RTFS_TYPE_XXX to normalize against, 0 if not known.
*/
RTFMODE rtFsModeFromDos(RTFMODE fMode, const char *pszName, size_t cbName, uint32_t uReparseTag, RTFMODE fType)
{
Assert(!(fType & ~RTFS_TYPE_MASK));
fMode &= ~((1 << RTFS_DOS_SHIFT) - 1);
/* Forcibly set the directory attribute if caller desires it. */
if (fType == RTFS_TYPE_DIRECTORY)
fMode |= RTFS_DOS_DIRECTORY;
/* Everything is readable. */
fMode |= RTFS_UNIX_IRUSR | RTFS_UNIX_IRGRP | RTFS_UNIX_IROTH;
if (fMode & RTFS_DOS_DIRECTORY)
/* Directories are executable. */
fMode |= RTFS_TYPE_DIRECTORY | RTFS_UNIX_IXUSR | RTFS_UNIX_IXGRP | RTFS_UNIX_IXOTH;
else
{
fMode |= RTFS_TYPE_FILE;
if (!cbName && pszName)
cbName = strlen(pszName);
if (cbName >= 4 && pszName[cbName - 4] == '.')
{
/* check for executable extension. */
const char *pszExt = &pszName[cbName - 3];
char szExt[4];
szExt[0] = RT_C_TO_LOWER(pszExt[0]);
szExt[1] = RT_C_TO_LOWER(pszExt[1]);
szExt[2] = RT_C_TO_LOWER(pszExt[2]);
szExt[3] = '\0';
if ( !memcmp(szExt, "exe", 4)
|| !memcmp(szExt, "bat", 4)
|| !memcmp(szExt, "com", 4)
|| !memcmp(szExt, "cmd", 4)
|| !memcmp(szExt, "btm", 4)
)
fMode |= RTFS_UNIX_IXUSR | RTFS_UNIX_IXGRP | RTFS_UNIX_IXOTH;
}
}
/* Is it really a symbolic link? */
if ((fMode & RTFS_DOS_NT_REPARSE_POINT) && uReparseTag == RTFSMODE_SYMLINK_REPARSE_TAG)
fMode = (fMode & ~RTFS_TYPE_MASK) | RTFS_TYPE_SYMLINK;
/*
* Writable?
*
* Note! We ignore the read-only flag on directories as windows seems to
* use it for purposes other than writability (@ticketref{18345}):
* https://support.microsoft.com/en-gb/help/326549/you-cannot-view-or-change-the-read-only-or-the-system-attributes-of-fo
*
*/
if ((fMode & (RTFS_DOS_DIRECTORY | RTFS_DOS_READONLY)) != RTFS_DOS_READONLY)
fMode |= RTFS_UNIX_IWUSR | RTFS_UNIX_IWGRP | RTFS_UNIX_IWOTH;
return fMode;
}
/**
* Converts Unix attributes to Dos-style attributes.
*
* @returns File mode mask.
* @param fMode The mode mask containing dos-style attributes only.
* @param pszName The filename which this applies to (hidden check).
* @param cbName The length of that filename. (optional, set 0)
* @param fType RTFS_TYPE_XXX to normalize against, 0 if not known.
*/
RTFMODE rtFsModeFromUnix(RTFMODE fMode, const char *pszName, size_t cbName, RTFMODE fType)
{
Assert(!(fType & ~RTFS_TYPE_MASK));
NOREF(cbName);
fMode &= RTFS_UNIX_MASK;
if (!(fType & RTFS_TYPE_MASK) && fType)
fMode |= fType;
if (!(fMode & (RTFS_UNIX_IWUSR | RTFS_UNIX_IWGRP | RTFS_UNIX_IWOTH)))
fMode |= RTFS_DOS_READONLY;
if (RTFS_IS_DIRECTORY(fMode))
fMode |= RTFS_DOS_DIRECTORY;
if (!(fMode & RTFS_DOS_MASK))
fMode |= RTFS_DOS_NT_NORMAL;
if (!(fMode & RTFS_DOS_HIDDEN) && pszName)
{
pszName = RTPathFilename(pszName);
if ( pszName
&& pszName[0] == '.'
&& pszName[1] != '\0' /* exclude "." */
&& (pszName[1] != '.' || pszName[2] != '\0')) /* exclude ".." */
fMode |= RTFS_DOS_HIDDEN;
}
return fMode;
}
/**
* Normalizes the give mode mask.
*
* It will create the missing unix or dos mask from the other (one
* of them is required by all APIs), and guess the file type if that's
* missing.
*
* @returns Normalized file mode.
* @param fMode The mode mask that may contain a partial/incomplete mask.
* @param pszName The filename which this applies to (exe check).
* @param cbName The length of that filename. (optional, set 0)
* @param fType RTFS_TYPE_XXX to normalize against, 0 if not known.
*/
RTFMODE rtFsModeNormalize(RTFMODE fMode, const char *pszName, size_t cbName, RTFMODE fType)
{
Assert(!(fType & ~RTFS_TYPE_MASK));
if (!(fMode & RTFS_UNIX_MASK))
fMode = rtFsModeFromDos(fMode, pszName, cbName, RTFSMODE_SYMLINK_REPARSE_TAG, fType);
else if (!(fMode & RTFS_DOS_MASK))
fMode = rtFsModeFromUnix(fMode, pszName, cbName, fType);
else if (!(fMode & RTFS_TYPE_MASK))
fMode |= fMode & RTFS_DOS_DIRECTORY ? RTFS_TYPE_DIRECTORY : RTFS_TYPE_FILE;
else if (RTFS_IS_DIRECTORY(fMode))
fMode |= RTFS_DOS_DIRECTORY;
return fMode;
}
/**
* Checks if the file mode is valid or not.
*
* @return true if valid.
* @return false if invalid, done bitching.
* @param fMode The file mode.
*/
bool rtFsModeIsValid(RTFMODE fMode)
{
AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
|| (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
("%RTfmode\n", fMode), false);
AssertMsgReturn(RTFS_TYPE_MASK & fMode,
("%RTfmode\n", fMode), false);
/** @todo more checks! */
return true;
}
/**
* Checks if the file mode is valid as a permission mask or not.
*
* @return true if valid.
* @return false if invalid, done bitching.
* @param fMode The file mode.
*/
bool rtFsModeIsValidPermissions(RTFMODE fMode)
{
AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
|| (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
("%RTfmode\n", fMode), false);
/** @todo more checks! */
return true;
}
RTDECL(const char *) RTFsTypeName(RTFSTYPE enmType)
{
switch (enmType)
{
case RTFSTYPE_UNKNOWN: return "unknown";
case RTFSTYPE_UDF: return "udf";
case RTFSTYPE_ISO9660: return "iso9660";
case RTFSTYPE_FUSE: return "fuse";
case RTFSTYPE_VBOXSHF: return "vboxshf";
case RTFSTYPE_EXT: return "ext";
case RTFSTYPE_EXT2: return "ext2";
case RTFSTYPE_EXT3: return "ext3";
case RTFSTYPE_EXT4: return "ext4";
case RTFSTYPE_XFS: return "xfs";
case RTFSTYPE_CIFS: return "cifs";
case RTFSTYPE_SMBFS: return "smbfs";
case RTFSTYPE_TMPFS: return "tmpfs";
case RTFSTYPE_SYSFS: return "sysfs";
case RTFSTYPE_PROC: return "proc";
case RTFSTYPE_OCFS2: return "ocfs2";
case RTFSTYPE_BTRFS: return "btrfs";
case RTFSTYPE_NTFS: return "ntfs";
case RTFSTYPE_FAT: return "fat";
case RTFSTYPE_EXFAT: return "exfat";
case RTFSTYPE_REFS: return "refs";
case RTFSTYPE_ZFS: return "zfs";
case RTFSTYPE_UFS: return "ufs";
case RTFSTYPE_NFS: return "nfs";
case RTFSTYPE_HFS: return "hfs";
case RTFSTYPE_APFS: return "apfs";
case RTFSTYPE_AUTOFS: return "autofs";
case RTFSTYPE_DEVFS: return "devfs";
case RTFSTYPE_HPFS: return "hpfs";
case RTFSTYPE_JFS: return "jfs";
case RTFSTYPE_END: return "end";
case RTFSTYPE_32BIT_HACK: break;
}
/* Don't put this in as 'default:', we wish GCC to warn about missing cases. */
static char s_asz[4][64];
static uint32_t volatile s_i = 0;
uint32_t i = ASMAtomicIncU32(&s_i) % RT_ELEMENTS(s_asz);
RTStrPrintf(s_asz[i], sizeof(s_asz[i]), "type=%d", enmType);
return s_asz[i];
}
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