fs.cpp@ 78359

Last change on this file since 78359 was 78205, checked in by vboxsync, 6 years ago
IPRT/rtFsModeFromDos: Ignore read-only DOS attribute on directories. ticketref:18345 bugref:9172
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1	/* $Id: fs.cpp 78205 2019-04-18 12:03:22Z vboxsync $ */
2	/** @file
3	* IPRT - File System.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include <iprt/fs.h>
32	#include "internal/iprt.h"
33
34	#include <iprt/asm.h>
35	#include <iprt/assert.h>
36	#include <iprt/ctype.h>
37	#include <iprt/path.h>
38	#include <iprt/string.h>
39	#include <iprt/time.h>
40	#include "internal/fs.h"
41
42
43	/**
44	* Converts dos-style attributes to Unix attributes.
45	*
46	* @returns
47	* @param fMode The mode mask containing dos-style attributes only.
48	* @param pszName The filename which this applies to (exe check).
49	* @param cbName The length of that filename. (optional, set 0)
50	* @param uReparseTag The reparse tag if RTFS_DOS_NT_REPARSE_POINT is set.
51	*/
52	RTFMODE rtFsModeFromDos(RTFMODE fMode, const char *pszName, size_t cbName, uint32_t uReparseTag)
53	{
54	fMode &= ~((1 << RTFS_DOS_SHIFT) - 1);
55
56	/* everything is readable. */
57	fMode \|= RTFS_UNIX_IRUSR \| RTFS_UNIX_IRGRP \| RTFS_UNIX_IROTH;
58	if (fMode & RTFS_DOS_DIRECTORY)
59	/* directories are executable. */
60	fMode \|= RTFS_TYPE_DIRECTORY \| RTFS_UNIX_IXUSR \| RTFS_UNIX_IXGRP \| RTFS_UNIX_IXOTH;
61	else
62	{
63	fMode \|= RTFS_TYPE_FILE;
64	if (!cbName && pszName)
65	cbName = strlen(pszName);
66	if (cbName >= 4 && pszName[cbName - 4] == '.')
67	{
68	/* check for executable extension. */
69	const char *pszExt = &pszName[cbName - 3];
70	char szExt[4];
71	szExt[0] = RT_C_TO_LOWER(pszExt[0]);
72	szExt[1] = RT_C_TO_LOWER(pszExt[1]);
73	szExt[2] = RT_C_TO_LOWER(pszExt[2]);
74	szExt[3] = '\0';
75	if ( !memcmp(szExt, "exe", 4)
76	\|\| !memcmp(szExt, "bat", 4)
77	\|\| !memcmp(szExt, "com", 4)
78	\|\| !memcmp(szExt, "cmd", 4)
79	\|\| !memcmp(szExt, "btm", 4)
80	)
81	fMode \|= RTFS_UNIX_IXUSR \| RTFS_UNIX_IXGRP \| RTFS_UNIX_IXOTH;
82	}
83	}
84
85	/* Is it really a symbolic link? */
86	if ((fMode & RTFS_DOS_NT_REPARSE_POINT) && uReparseTag == RTFSMODE_SYMLINK_REPARSE_TAG)
87	fMode = (fMode & ~RTFS_TYPE_MASK) \| RTFS_TYPE_SYMLINK;
88
89	/*
90	* Writable?
91	*
92	* Note! We ignore the read-only flag on directories as windows seems to
93	* use it for purposes other than writability (@ticketref{18345}):
94	* https://support.microsoft.com/en-gb/help/326549/you-cannot-view-or-change-the-read-only-or-the-system-attributes-of-fo
95	*
96	*/
97	if ((fMode & (RTFS_DOS_DIRECTORY \| RTFS_DOS_READONLY)) != RTFS_DOS_READONLY)
98	fMode \|= RTFS_UNIX_IWUSR \| RTFS_UNIX_IWGRP \| RTFS_UNIX_IWOTH;
99	return fMode;
100	}
101
102
103	/**
104	* Converts Unix attributes to Dos-style attributes.
105	*
106	* @returns File mode mask.
107	* @param fMode The mode mask containing dos-style attributes only.
108	* @param pszName The filename which this applies to (hidden check).
109	* @param cbName The length of that filename. (optional, set 0)
110	*/
111	RTFMODE rtFsModeFromUnix(RTFMODE fMode, const char *pszName, size_t cbName)
112	{
113	NOREF(cbName);
114
115	fMode &= RTFS_UNIX_MASK;
116
117	if (!(fMode & (RTFS_UNIX_IWUSR \| RTFS_UNIX_IWGRP \| RTFS_UNIX_IWOTH)))
118	fMode \|= RTFS_DOS_READONLY;
119	if (RTFS_IS_DIRECTORY(fMode))
120	fMode \|= RTFS_DOS_DIRECTORY;
121	if (!(fMode & RTFS_DOS_MASK))
122	fMode \|= RTFS_DOS_NT_NORMAL;
123	if (!(fMode & RTFS_DOS_HIDDEN) && pszName)
124	{
125	pszName = RTPathFilename(pszName);
126	if (pszName && *pszName == '.')
127	fMode \|= RTFS_DOS_HIDDEN;
128	}
129	return fMode;
130	}
131
132
133	/**
134	* Normalizes the give mode mask.
135	*
136	* It will create the missing unix or dos mask from the other (one
137	* of them is required by all APIs), and guess the file type if that's
138	* missing.
139	*
140	* @returns Normalized file mode.
141	* @param fMode The mode mask that may contain a partial/incomplete mask.
142	* @param pszName The filename which this applies to (exe check).
143	* @param cbName The length of that filename. (optional, set 0)
144	*/
145	RTFMODE rtFsModeNormalize(RTFMODE fMode, const char *pszName, size_t cbName)
146	{
147	if (!(fMode & RTFS_UNIX_MASK))
148	fMode = rtFsModeFromDos(fMode, pszName, cbName, RTFSMODE_SYMLINK_REPARSE_TAG);
149	else if (!(fMode & RTFS_DOS_MASK))
150	fMode = rtFsModeFromUnix(fMode, pszName, cbName);
151	else if (!(fMode & RTFS_TYPE_MASK))
152	fMode \|= fMode & RTFS_DOS_DIRECTORY ? RTFS_TYPE_DIRECTORY : RTFS_TYPE_FILE;
153	else if (RTFS_IS_DIRECTORY(fMode))
154	fMode \|= RTFS_DOS_DIRECTORY;
155	return fMode;
156	}
157
158
159	/**
160	* Checks if the file mode is valid or not.
161	*
162	* @return true if valid.
163	* @return false if invalid, done bitching.
164	* @param fMode The file mode.
165	*/
166	bool rtFsModeIsValid(RTFMODE fMode)
167	{
168	AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
169	\|\| (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
170	("%RTfmode\n", fMode), false);
171	AssertMsgReturn(RTFS_TYPE_MASK & fMode,
172	("%RTfmode\n", fMode), false);
173	/** @todo more checks! */
174	return true;
175	}
176
177
178	/**
179	* Checks if the file mode is valid as a permission mask or not.
180	*
181	* @return true if valid.
182	* @return false if invalid, done bitching.
183	* @param fMode The file mode.
184	*/
185	bool rtFsModeIsValidPermissions(RTFMODE fMode)
186	{
187	AssertMsgReturn( (!RTFS_IS_DIRECTORY(fMode) && !(fMode & RTFS_DOS_DIRECTORY))
188	\|\| (RTFS_IS_DIRECTORY(fMode) && (fMode & RTFS_DOS_DIRECTORY)),
189	("%RTfmode\n", fMode), false);
190	/** @todo more checks! */
191	return true;
192	}
193
194
195	RTDECL(const char *) RTFsTypeName(RTFSTYPE enmType)
196	{
197	switch (enmType)
198	{
199	case RTFSTYPE_UNKNOWN: return "unknown";
200	case RTFSTYPE_UDF: return "udf";
201	case RTFSTYPE_ISO9660: return "iso9660";
202	case RTFSTYPE_FUSE: return "fuse";
203	case RTFSTYPE_VBOXSHF: return "vboxshf";
204
205	case RTFSTYPE_EXT: return "ext";
206	case RTFSTYPE_EXT2: return "ext2";
207	case RTFSTYPE_EXT3: return "ext3";
208	case RTFSTYPE_EXT4: return "ext4";
209	case RTFSTYPE_XFS: return "xfs";
210	case RTFSTYPE_CIFS: return "cifs";
211	case RTFSTYPE_SMBFS: return "smbfs";
212	case RTFSTYPE_TMPFS: return "tmpfs";
213	case RTFSTYPE_SYSFS: return "sysfs";
214	case RTFSTYPE_PROC: return "proc";
215	case RTFSTYPE_OCFS2: return "ocfs2";
216	case RTFSTYPE_BTRFS: return "btrfs";
217
218	case RTFSTYPE_NTFS: return "ntfs";
219	case RTFSTYPE_FAT: return "fat";
220	case RTFSTYPE_EXFAT: return "exfat";
221	case RTFSTYPE_REFS: return "refs";
222
223	case RTFSTYPE_ZFS: return "zfs";
224	case RTFSTYPE_UFS: return "ufs";
225	case RTFSTYPE_NFS: return "nfs";
226
227	case RTFSTYPE_HFS: return "hfs";
228	case RTFSTYPE_APFS: return "apfs";
229	case RTFSTYPE_AUTOFS: return "autofs";
230	case RTFSTYPE_DEVFS: return "devfs";
231
232	case RTFSTYPE_HPFS: return "hpfs";
233	case RTFSTYPE_JFS: return "jfs";
234
235	case RTFSTYPE_END: return "end";
236	case RTFSTYPE_32BIT_HACK: break;
237	}
238
239	/* Don't put this in as 'default:', we wish GCC to warn about missing cases. */
240	static char s_asz[4][64];
241	static uint32_t volatile s_i = 0;
242	uint32_t i = ASMAtomicIncU32(&s_i) % RT_ELEMENTS(s_asz);
243	RTStrPrintf(s_asz[i], sizeof(s_asz[i]), "type=%d", enmType);
244	return s_asz[i];
245	}
246

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source: vbox/trunk/src/VBox/Runtime/r3/fs.cpp@ 78359

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