/* $Id: fs.cpp 78205 2019-04-18 12:03:22Z vboxsync $ */ /** @file * IPRT - File System. */ /* * Copyright (C) 2006-2019 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE 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. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include "internal/iprt.h" #include #include #include #include #include #include #include "internal/fs.h" /** * Converts dos-style attributes to Unix attributes. * * @returns * @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. */ RTFMODE rtFsModeFromDos(RTFMODE fMode, const char *pszName, size_t cbName, uint32_t uReparseTag) { fMode &= ~((1 << RTFS_DOS_SHIFT) - 1); /* 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) */ RTFMODE rtFsModeFromUnix(RTFMODE fMode, const char *pszName, size_t cbName) { NOREF(cbName); fMode &= RTFS_UNIX_MASK; 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 == '.') 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) */ RTFMODE rtFsModeNormalize(RTFMODE fMode, const char *pszName, size_t cbName) { if (!(fMode & RTFS_UNIX_MASK)) fMode = rtFsModeFromDos(fMode, pszName, cbName, RTFSMODE_SYMLINK_REPARSE_TAG); else if (!(fMode & RTFS_DOS_MASK)) fMode = rtFsModeFromUnix(fMode, pszName, cbName); 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]; }