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source: branches/samba-3.3.x/source/smbd/dosmode.c@ 621

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Last change on this file since 621 was 370, checked in by Herwig Bauernfeind, 16 years ago
Update Samba 3.3 to 3.3.10 (source)
File size: 20.3 KB

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1	/*
2	Unix SMB/CIFS implementation.
3	dos mode handling functions
4	Copyright (C) Andrew Tridgell 1992-1998
5	Copyright (C) James Peach 2006
6
7	This program is free software; you can redistribute it and/or modify
8	it under the terms of the GNU General Public License as published by
9	the Free Software Foundation; either version 3 of the License, or
10	(at your option) any later version.
11
12	This program is distributed in the hope that it will be useful,
13	but WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	GNU General Public License for more details.
16
17	You should have received a copy of the GNU General Public License
18	along with this program. If not, see <http://www.gnu.org/licenses/>.
19	*/
20
21	#include "includes.h"
22
23	extern enum protocol_types Protocol;
24
25	static uint32_t filter_mode_by_protocol(uint32_t mode)
26	{
27	if (Protocol <= PROTOCOL_LANMAN2) {
28	DEBUG(10,("filter_mode_by_protocol: "
29	"filtering result 0x%x to 0x%x\n",
30	(unsigned int)mode,
31	(unsigned int)(mode & 0x3f) ));
32	mode &= 0x3f;
33	}
34	return mode;
35	}
36
37	static int set_sparse_flag(const SMB_STRUCT_STAT * const sbuf)
38	{
39	#if defined (HAVE_STAT_ST_BLOCKS) && defined(STAT_ST_BLOCKSIZE)
40	if (sbuf->st_size > sbuf->st_blocks * (SMB_OFF_T)STAT_ST_BLOCKSIZE) {
41	return FILE_ATTRIBUTE_SPARSE;
42	}
43	#endif
44	return 0;
45	}
46
47	/****************************************************************************
48	Change a dos mode to a unix mode.
49	Base permission for files:
50	if creating file and inheriting (i.e. parent_dir != NULL)
51	apply read/write bits from parent directory.
52	else
53	everybody gets read bit set
54	dos readonly is represented in unix by removing everyone's write bit
55	dos archive is represented in unix by the user's execute bit
56	dos system is represented in unix by the group's execute bit
57	dos hidden is represented in unix by the other's execute bit
58	if !inheriting {
59	Then apply create mask,
60	then add force bits.
61	}
62	Base permission for directories:
63	dos directory is represented in unix by unix's dir bit and the exec bit
64	if !inheriting {
65	Then apply create mask,
66	then add force bits.
67	}
68	****************************************************************************/
69
70	mode_t unix_mode(connection_struct conn, int dosmode, const char fname,
71	const char *inherit_from_dir)
72	{
73	mode_t result = (S_IRUSR \| S_IRGRP \| S_IROTH \| S_IWUSR \| S_IWGRP \| S_IWOTH);
74	mode_t dir_mode = 0; /* Mode of the inherit_from directory if
75	* inheriting. */
76
77	if (!lp_store_dos_attributes(SNUM(conn)) && IS_DOS_READONLY(dosmode)) {
78	result &= ~(S_IWUSR \| S_IWGRP \| S_IWOTH);
79	}
80
81	if (fname && (inherit_from_dir != NULL)
82	&& lp_inherit_perms(SNUM(conn))) {
83	SMB_STRUCT_STAT sbuf;
84
85	DEBUG(2, ("unix_mode(%s) inheriting from %s\n", fname,
86	inherit_from_dir));
87	if (SMB_VFS_STAT(conn, inherit_from_dir, &sbuf) != 0) {
88	DEBUG(4,("unix_mode(%s) failed, [dir %s]: %s\n", fname,
89	inherit_from_dir, strerror(errno)));
90	return(0); /* * shouldn't happen! * */
91	}
92
93	/* Save for later - but explicitly remove setuid bit for safety. */
94	dir_mode = sbuf.st_mode & ~S_ISUID;
95	DEBUG(2,("unix_mode(%s) inherit mode %o\n",fname,(int)dir_mode));
96	/* Clear "result" */
97	result = 0;
98	}
99
100	if (IS_DOS_DIR(dosmode)) {
101	/* We never make directories read only for the owner as under DOS a user
102	can always create a file in a read-only directory. */
103	result \|= (S_IFDIR \| S_IWUSR);
104
105	if (dir_mode) {
106	/* Inherit mode of parent directory. */
107	result \|= dir_mode;
108	} else {
109	/* Provisionally add all 'x' bits */
110	result \|= (S_IXUSR \| S_IXGRP \| S_IXOTH);
111
112	/* Apply directory mask */
113	result &= lp_dir_mask(SNUM(conn));
114	/* Add in force bits */
115	result \|= lp_force_dir_mode(SNUM(conn));
116	}
117	} else {
118	if (lp_map_archive(SNUM(conn)) && IS_DOS_ARCHIVE(dosmode))
119	result \|= S_IXUSR;
120
121	if (lp_map_system(SNUM(conn)) && IS_DOS_SYSTEM(dosmode))
122	result \|= S_IXGRP;
123
124	if (lp_map_hidden(SNUM(conn)) && IS_DOS_HIDDEN(dosmode))
125	result \|= S_IXOTH;
126
127	if (dir_mode) {
128	/* Inherit 666 component of parent directory mode */
129	result \|= dir_mode & (S_IRUSR \| S_IRGRP \| S_IROTH \| S_IWUSR \| S_IWGRP \| S_IWOTH);
130	} else {
131	/* Apply mode mask */
132	result &= lp_create_mask(SNUM(conn));
133	/* Add in force bits */
134	result \|= lp_force_create_mode(SNUM(conn));
135	}
136	}
137
138	DEBUG(3,("unix_mode(%s) returning 0%o\n",fname,(int)result ));
139	return(result);
140	}
141
142	/****************************************************************************
143	Change a unix mode to a dos mode.
144	****************************************************************************/
145
146	static uint32 dos_mode_from_sbuf(connection_struct conn, const char path, SMB_STRUCT_STAT *sbuf)
147	{
148	int result = 0;
149	enum mapreadonly_options ro_opts = (enum mapreadonly_options)lp_map_readonly(SNUM(conn));
150
151	if (ro_opts == MAP_READONLY_YES) {
152	/* Original Samba method - map inverse of user "w" bit. */
153	#ifndef __OS2__
154	if ((sbuf->st_mode & S_IWUSR) == 0) {
155	#else
156	if(os2_isattribute(path,aRONLY)==0) {
157	#endif
158	result \|= aRONLY;
159	}
160	} else if (ro_opts == MAP_READONLY_PERMISSIONS) {
161	/* Check actual permissions for read-only. */
162	if (!can_write_to_file(conn, path, sbuf)) {
163	result \|= aRONLY;
164	}
165	} /* Else never set the readonly bit. */
166
167	#ifndef __OS2__
168	if (MAP_ARCHIVE(conn) && ((sbuf->st_mode & S_IXUSR) != 0))
169	#else
170	if(os2_isattribute(path,aARCH)==0)
171	#endif
172	result \|= aARCH;
173
174	#ifndef __OS2__
175	if (MAP_SYSTEM(conn) && ((sbuf->st_mode & S_IXGRP) != 0))
176	#else
177	if(os2_isattribute(path,aSYSTEM)==0)
178	#endif
179	result \|= aSYSTEM;
180
181	#ifndef __OS2__
182	if (MAP_HIDDEN(conn) && ((sbuf->st_mode & S_IXOTH) != 0))
183	#else
184	if(os2_isattribute(path,aHIDDEN)==0)
185	#endif
186	result \|= aHIDDEN;
187
188	if (S_ISDIR(sbuf->st_mode))
189	result = aDIR \| (result & aRONLY);
190
191	result \|= set_sparse_flag(sbuf);
192
193	#ifdef S_ISLNK
194	#if LINKS_READ_ONLY
195	if (S_ISLNK(sbuf->st_mode) && S_ISDIR(sbuf->st_mode))
196	result \|= aRONLY;
197	#endif
198	#endif
199
200	DEBUG(8,("dos_mode_from_sbuf returning "));
201
202	if (result & aHIDDEN) DEBUG(8, ("h"));
203	if (result & aRONLY ) DEBUG(8, ("r"));
204	if (result & aSYSTEM) DEBUG(8, ("s"));
205	if (result & aDIR ) DEBUG(8, ("d"));
206	if (result & aARCH ) DEBUG(8, ("a"));
207
208	DEBUG(8,("\n"));
209	return result;
210	}
211
212	/****************************************************************************
213	Get DOS attributes from an EA.
214	****************************************************************************/
215
216	static bool get_ea_dos_attribute(connection_struct conn, const char path,SMB_STRUCT_STAT sbuf, uint32 pattr)
217	{
218	ssize_t sizeret;
219	fstring attrstr;
220	unsigned int dosattr;
221
222	if (!lp_store_dos_attributes(SNUM(conn))) {
223	return False;
224	}
225
226	/* Don't reset pattr to zero as we may already have filename-based attributes we
227	need to preserve. */
228
229	sizeret = SMB_VFS_GETXATTR(conn, path, SAMBA_XATTR_DOS_ATTRIB, attrstr, sizeof(attrstr));
230	if (sizeret == -1) {
231	if (errno == ENOSYS
232	#if defined(ENOTSUP)
233	\|\| errno == ENOTSUP) {
234	#else
235	) {
236	#endif
237	#ifndef __OS2__
238	DEBUG(1,("get_ea_dos_attributes: Cannot get attribute from EA on file %s: Error = %s\n",
239	path, strerror(errno) ));
240	#else
241	// HB On OS/2 no error in case of ./.. and errno == 2
242	if ((strncmp(path,"./..",4) != 0) \|\| (errno != 2)) {
243	DEBUG(1,("get_ea_dos_attributes: Cannot get attribute from EA on file %s: Error = %s\n",
244	path, strerror(errno) ));
245
246	}
247	#endif
248	set_store_dos_attributes(SNUM(conn), False);
249	}
250	return False;
251	}
252	/* Null terminate string. */
253	attrstr[sizeret] = 0;
254	DEBUG(10,("get_ea_dos_attribute: %s attrstr = %s\n", path, attrstr));
255
256	if (sizeret < 2 \|\| attrstr[0] != '0' \|\| attrstr[1] != 'x' \|\|
257	sscanf(attrstr, "%x", &dosattr) != 1) {
258	DEBUG(1,("get_ea_dos_attributes: Badly formed DOSATTRIB on file %s - %s\n", path, attrstr));
259	return False;
260	}
261
262	if (S_ISDIR(sbuf->st_mode)) {
263	dosattr \|= aDIR;
264	}
265	*pattr = (uint32)(dosattr & SAMBA_ATTRIBUTES_MASK);
266
267	DEBUG(8,("get_ea_dos_attribute returning (0x%x)", dosattr));
268
269	if (dosattr & aHIDDEN) DEBUG(8, ("h"));
270	if (dosattr & aRONLY ) DEBUG(8, ("r"));
271	if (dosattr & aSYSTEM) DEBUG(8, ("s"));
272	if (dosattr & aDIR ) DEBUG(8, ("d"));
273	if (dosattr & aARCH ) DEBUG(8, ("a"));
274
275	DEBUG(8,("\n"));
276
277	return True;
278	}
279
280	/****************************************************************************
281	Set DOS attributes in an EA.
282	****************************************************************************/
283
284	static bool set_ea_dos_attribute(connection_struct conn, const char path, SMB_STRUCT_STAT *sbuf, uint32 dosmode)
285	{
286	fstring attrstr;
287	files_struct *fsp = NULL;
288	bool ret = False;
289
290	if (!lp_store_dos_attributes(SNUM(conn))) {
291	return False;
292	}
293
294	snprintf(attrstr, sizeof(attrstr)-1, "0x%x", dosmode & SAMBA_ATTRIBUTES_MASK);
295	if (SMB_VFS_SETXATTR(conn, path, SAMBA_XATTR_DOS_ATTRIB, attrstr, strlen(attrstr), 0) == -1) {
296	if((errno != EPERM) && (errno != EACCES)) {
297	if (errno == ENOSYS
298	#if defined(ENOTSUP)
299	\|\| errno == ENOTSUP) {
300	#else
301	) {
302	#endif
303	DEBUG(1,("set_ea_dos_attributes: Cannot set attribute EA on file %s: Error = %s\n",
304	path, strerror(errno) ));
305	set_store_dos_attributes(SNUM(conn), False);
306	}
307	return False;
308	}
309
310	/* We want DOS semantics, ie allow non owner with write permission to change the
311	bits on a file. Just like file_ntimes below.
312	*/
313
314	/* Check if we have write access. */
315	if(!CAN_WRITE(conn) \|\| !lp_dos_filemode(SNUM(conn)))
316	return False;
317
318	/*
319	* We need to open the file with write access whilst
320	* still in our current user context. This ensures we
321	* are not violating security in doing the setxattr.
322	*/
323
324	if (!NT_STATUS_IS_OK(open_file_fchmod(conn,path,sbuf,&fsp)))
325	return ret;
326	become_root();
327	if (SMB_VFS_SETXATTR(conn, path, SAMBA_XATTR_DOS_ATTRIB, attrstr, strlen(attrstr), 0) == 0) {
328	ret = True;
329	}
330	unbecome_root();
331	close_file_fchmod(fsp);
332	return ret;
333	}
334	DEBUG(10,("set_ea_dos_attribute: set EA %s on file %s\n", attrstr, path));
335	return True;
336	}
337
338	/****************************************************************************
339	Change a unix mode to a dos mode for an ms dfs link.
340	****************************************************************************/
341
342	uint32 dos_mode_msdfs(connection_struct conn, const char path,SMB_STRUCT_STAT *sbuf)
343	{
344	uint32 result = 0;
345
346	DEBUG(8,("dos_mode_msdfs: %s\n", path));
347
348	if (!VALID_STAT(*sbuf)) {
349	return 0;
350	}
351
352	/* First do any modifications that depend on the path name. */
353	/* hide files with a name starting with a . */
354	if (lp_hide_dot_files(SNUM(conn))) {
355	const char *p = strrchr_m(path,'/');
356	if (p) {
357	p++;
358	} else {
359	p = path;
360	}
361
362	/* Only . and .. are not hidden. */
363	if (p[0] == '.' && !((p[1] == '\0') \|\|
364	(p[1] == '.' && p[2] == '\0'))) {
365	result \|= aHIDDEN;
366	}
367	}
368
369	result \|= dos_mode_from_sbuf(conn, path, sbuf);
370
371	/* Optimization : Only call is_hidden_path if it's not already
372	hidden. */
373	if (!(result & aHIDDEN) && IS_HIDDEN_PATH(conn,path)) {
374	result \|= aHIDDEN;
375	}
376
377	if (result == 0) {
378	result = FILE_ATTRIBUTE_NORMAL;
379	}
380
381	result = filter_mode_by_protocol(result);
382
383	DEBUG(8,("dos_mode_msdfs returning "));
384
385	if (result & aHIDDEN) DEBUG(8, ("h"));
386	if (result & aRONLY ) DEBUG(8, ("r"));
387	if (result & aSYSTEM) DEBUG(8, ("s"));
388	if (result & aDIR ) DEBUG(8, ("d"));
389	if (result & aARCH ) DEBUG(8, ("a"));
390	if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
391
392	DEBUG(8,("\n"));
393
394	return(result);
395	}
396
397	/****************************************************************************
398	Change a unix mode to a dos mode.
399	****************************************************************************/
400
401	uint32 dos_mode(connection_struct conn, const char path,SMB_STRUCT_STAT *sbuf)
402	{
403	uint32 result = 0;
404	bool offline;
405
406	DEBUG(8,("dos_mode: %s\n", path));
407
408	if (!VALID_STAT(*sbuf)) {
409	return 0;
410	}
411
412	/* First do any modifications that depend on the path name. */
413	/* hide files with a name starting with a . */
414	if (lp_hide_dot_files(SNUM(conn))) {
415	const char *p = strrchr_m(path,'/');
416	if (p) {
417	p++;
418	} else {
419	p = path;
420	}
421
422	/* Only . and .. are not hidden. */
423	if (p[0] == '.' && !((p[1] == '\0') \|\|
424	(p[1] == '.' && p[2] == '\0'))) {
425	result \|= aHIDDEN;
426	}
427	}
428
429	/* Get the DOS attributes from an EA by preference. */
430	if (get_ea_dos_attribute(conn, path, sbuf, &result)) {
431	result \|= set_sparse_flag(sbuf);
432	} else {
433	result \|= dos_mode_from_sbuf(conn, path, sbuf);
434	}
435
436
437	offline = SMB_VFS_IS_OFFLINE(conn, path, sbuf);
438	if (S_ISREG(sbuf->st_mode) && offline) {
439	result \|= FILE_ATTRIBUTE_OFFLINE;
440	}
441
442	/* Optimization : Only call is_hidden_path if it's not already
443	hidden. */
444	if (!(result & aHIDDEN) && IS_HIDDEN_PATH(conn,path)) {
445	result \|= aHIDDEN;
446	}
447
448	if (result == 0) {
449	result = FILE_ATTRIBUTE_NORMAL;
450	}
451
452	result = filter_mode_by_protocol(result);
453
454	DEBUG(8,("dos_mode returning "));
455
456	if (result & aHIDDEN) DEBUG(8, ("h"));
457	if (result & aRONLY ) DEBUG(8, ("r"));
458	if (result & aSYSTEM) DEBUG(8, ("s"));
459	if (result & aDIR ) DEBUG(8, ("d"));
460	if (result & aARCH ) DEBUG(8, ("a"));
461	if (result & FILE_ATTRIBUTE_SPARSE ) DEBUG(8, ("[sparse]"));
462
463	DEBUG(8,("\n"));
464
465	return(result);
466	}
467
468	/*******************************************************************
469	chmod a file - but preserve some bits.
470	********************************************************************/
471
472	int file_set_dosmode(connection_struct conn, const char fname,
473	uint32 dosmode, SMB_STRUCT_STAT *st,
474	const char *parent_dir,
475	bool newfile)
476	{
477	SMB_STRUCT_STAT st1;
478	int mask=0;
479	mode_t tmp;
480	mode_t unixmode;
481	int ret = -1, lret = -1;
482	uint32_t old_mode;
483
484	/* We only allow READONLY\|HIDDEN\|SYSTEM\|DIRECTORY\|ARCHIVE here. */
485	dosmode &= (SAMBA_ATTRIBUTES_MASK \| FILE_ATTRIBUTE_OFFLINE);
486
487	DEBUG(10,("file_set_dosmode: setting dos mode 0x%x on file %s\n", dosmode, fname));
488
489	if (st == NULL) {
490	SET_STAT_INVALID(st1);
491	st = &st1;
492	}
493
494	if (!VALID_STAT(*st)) {
495	if (SMB_VFS_STAT(conn,fname,st))
496	return(-1);
497	}
498
499	unixmode = st->st_mode;
500
501	get_acl_group_bits(conn, fname, &st->st_mode);
502
503	if (S_ISDIR(st->st_mode))
504	dosmode \|= aDIR;
505	else
506	dosmode &= ~aDIR;
507
508	old_mode = dos_mode(conn,fname,st);
509
510	if (dosmode & FILE_ATTRIBUTE_OFFLINE) {
511	if (!(old_mode & FILE_ATTRIBUTE_OFFLINE)) {
512	lret = SMB_VFS_SET_OFFLINE(conn, fname);
513	if (lret == -1) {
514	DEBUG(0, ("set_dos_mode: client has asked to set "
515	"FILE_ATTRIBUTE_OFFLINE to %s/%s but there was "
516	"an error while setting it or it is not supported.\n",
517	parent_dir, fname));
518	}
519	}
520	}
521
522	dosmode &= ~FILE_ATTRIBUTE_OFFLINE;
523	old_mode &= ~FILE_ATTRIBUTE_OFFLINE;
524
525	if (old_mode == dosmode) {
526	st->st_mode = unixmode;
527	return(0);
528	}
529
530	/* Store the DOS attributes in an EA by preference. */
531	if (set_ea_dos_attribute(conn, fname, st, dosmode)) {
532	if (!newfile) {
533	notify_fname(conn, NOTIFY_ACTION_MODIFIED,
534	FILE_NOTIFY_CHANGE_ATTRIBUTES, fname);
535	}
536	st->st_mode = unixmode;
537	return 0;
538	}
539
540	unixmode = unix_mode(conn,dosmode,fname, parent_dir);
541
542	/* preserve the s bits */
543	mask \|= (S_ISUID \| S_ISGID);
544
545	/* preserve the t bit */
546	#ifdef S_ISVTX
547	mask \|= S_ISVTX;
548	#endif
549
550	/* possibly preserve the x bits */
551	if (!MAP_ARCHIVE(conn))
552	mask \|= S_IXUSR;
553	if (!MAP_SYSTEM(conn))
554	mask \|= S_IXGRP;
555	if (!MAP_HIDDEN(conn))
556	mask \|= S_IXOTH;
557
558	unixmode \|= (st->st_mode & mask);
559
560	/* if we previously had any r bits set then leave them alone */
561	if ((tmp = st->st_mode & (S_IRUSR\|S_IRGRP\|S_IROTH))) {
562	unixmode &= ~(S_IRUSR\|S_IRGRP\|S_IROTH);
563	unixmode \|= tmp;
564	}
565
566	/* if we previously had any w bits set then leave them alone
567	whilst adding in the new w bits, if the new mode is not rdonly */
568	if (!IS_DOS_READONLY(dosmode)) {
569	unixmode \|= (st->st_mode & (S_IWUSR\|S_IWGRP\|S_IWOTH));
570	}
571
572	ret = SMB_VFS_CHMOD(conn, fname, unixmode);
573	if (ret == 0) {
574	if(!newfile \|\| (lret != -1)) {
575	notify_fname(conn, NOTIFY_ACTION_MODIFIED,
576	FILE_NOTIFY_CHANGE_ATTRIBUTES, fname);
577	}
578	st->st_mode = unixmode;
579	return 0;
580	}
581
582	if((errno != EPERM) && (errno != EACCES))
583	return -1;
584
585	if(!lp_dos_filemode(SNUM(conn)))
586	return -1;
587
588	/* We want DOS semantics, ie allow non owner with write permission to change the
589	bits on a file. Just like file_ntimes below.
590	*/
591
592	/* Check if we have write access. */
593	if (CAN_WRITE(conn)) {
594	/*
595	* We need to open the file with write access whilst
596	* still in our current user context. This ensures we
597	* are not violating security in doing the fchmod.
598	* This file open does not break any oplocks we are
599	* holding. We need to review this.... may need to
600	* break batch oplocks open by others. JRA.
601	*/
602	files_struct *fsp;
603	if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,st,&fsp)))
604	return -1;
605	become_root();
606	ret = SMB_VFS_FCHMOD(fsp, unixmode);
607	unbecome_root();
608	close_file_fchmod(fsp);
609	if (!newfile) {
610	notify_fname(conn, NOTIFY_ACTION_MODIFIED,
611	FILE_NOTIFY_CHANGE_ATTRIBUTES, fname);
612	}
613	if (ret == 0) {
614	st->st_mode = unixmode;
615	}
616	}
617
618	return( ret );
619	}
620
621	/*******************************************************************
622	Wrapper around the VFS ntimes that possibly allows DOS semantics rather
623	than POSIX.
624	*******************************************************************/
625
626	int file_ntimes(connection_struct conn, const char fname, const struct timespec ts[2])
627	{
628	SMB_STRUCT_STAT sbuf;
629	int ret = -1;
630
631	errno = 0;
632	ZERO_STRUCT(sbuf);
633
634	DEBUG(6, ("file_ntime: actime: %s",
635	time_to_asc(convert_timespec_to_time_t(ts[0]))));
636	DEBUG(6, ("file_ntime: modtime: %s",
637	time_to_asc(convert_timespec_to_time_t(ts[1]))));
638
639	/* Don't update the time on read-only shares */
640	/* We need this as set_filetime (which can be called on
641	close and other paths) can end up calling this function
642	without the NEED_WRITE protection. Found by :
643	Leo Weppelman <leo@wau.mis.ah.nl>
644	*/
645
646	if (!CAN_WRITE(conn)) {
647	return 0;
648	}
649
650	if(SMB_VFS_NTIMES(conn, fname, ts) == 0) {
651	return 0;
652	}
653
654	if((errno != EPERM) && (errno != EACCES)) {
655	return -1;
656	}
657
658	if(!lp_dos_filetimes(SNUM(conn))) {
659	return -1;
660	}
661
662	/* We have permission (given by the Samba admin) to
663	break POSIX semantics and allow a user to change
664	the time on a file they don't own but can write to
665	(as DOS does).
666	*/
667
668	/* Check if we have write access. */
669	if (can_write_to_file(conn, fname, &sbuf)) {
670	/* We are allowed to become root and change the filetime. */
671	become_root();
672	ret = SMB_VFS_NTIMES(conn, fname, ts);
673	unbecome_root();
674	}
675
676	return ret;
677	}
678
679	/******************************************************************
680	Force a "sticky" write time on a pathname. This will always be
681	returned on all future write time queries and set on close.
682	******************************************************************/
683
684	bool set_sticky_write_time_path(connection_struct conn, const char fname,
685	struct file_id fileid, const struct timespec mtime)
686	{
687	if (null_timespec(mtime)) {
688	return true;
689	}
690
691	if (!set_sticky_write_time(fileid, mtime)) {
692	return false;
693	}
694
695	return true;
696	}
697
698	/******************************************************************
699	Force a "sticky" write time on an fsp. This will always be
700	returned on all future write time queries and set on close.
701	******************************************************************/
702
703	bool set_sticky_write_time_fsp(struct files_struct *fsp, const struct timespec mtime)
704	{
705	fsp->write_time_forced = true;
706	TALLOC_FREE(fsp->update_write_time_event);
707
708	return set_sticky_write_time_path(fsp->conn, fsp->fsp_name,
709	fsp->file_id, mtime);
710	}
711
712	/******************************************************************
713	Update a write time immediately, without the 2 second delay.
714	******************************************************************/
715
716	bool update_write_time(struct files_struct *fsp)
717	{
718	if (!set_write_time(fsp->file_id, timespec_current())) {
719	return false;
720	}
721
722	notify_fname(fsp->conn, NOTIFY_ACTION_MODIFIED,
723	FILE_NOTIFY_CHANGE_LAST_WRITE, fsp->fsp_name);
724
725	return true;
726	}

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