Context Navigation

source: branches/samba-3.2.x/source/smbd/dir.c@ 715

Visit:

Last change on this file since 715 was 149, checked in by Paul Smedley, 17 years ago
Update trunk to v3.2.2
File size: 37.9 KB

Line
1	/*
2	Unix SMB/CIFS implementation.
3	Directory handling routines
4	Copyright (C) Andrew Tridgell 1992-1998
5	Copyright (C) Jeremy Allison 2007
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	/*
24	This module implements directory related functions for Samba.
25	*/
26
27	extern struct current_user current_user;
28
29	/* "Special" directory offsets. */
30	#define END_OF_DIRECTORY_OFFSET ((long)-1)
31	#define START_OF_DIRECTORY_OFFSET ((long)0)
32	#define DOT_DOT_DIRECTORY_OFFSET ((long)0x80000000)
33
34	/* Make directory handle internals available. */
35
36	struct name_cache_entry {
37	char *name;
38	long offset;
39	};
40
41	struct smb_Dir {
42	connection_struct *conn;
43	SMB_STRUCT_DIR *dir;
44	long offset;
45	char *dir_path;
46	size_t name_cache_size;
47	struct name_cache_entry *name_cache;
48	unsigned int name_cache_index;
49	unsigned int file_number;
50	};
51
52	struct dptr_struct {
53	struct dptr_struct next, prev;
54	int dnum;
55	uint16 spid;
56	struct connection_struct *conn;
57	struct smb_Dir *dir_hnd;
58	bool expect_close;
59	char *wcard;
60	uint32 attr;
61	char *path;
62	bool has_wild; /* Set to true if the wcard entry has MS wildcard characters in it. */
63	bool did_stat; /* Optimisation for non-wcard searches. */
64	};
65
66	static struct bitmap *dptr_bmap;
67	static struct dptr_struct *dirptrs;
68	static int dirhandles_open = 0;
69
70	#define INVALID_DPTR_KEY (-3)
71
72	/****************************************************************************
73	Make a dir struct.
74	****************************************************************************/
75
76	bool make_dir_struct(TALLOC_CTX *ctx,
77	char *buf,
78	const char *mask,
79	const char *fname,
80	SMB_OFF_T size,
81	uint32 mode,
82	time_t date,
83	bool uc)
84	{
85	char *p;
86	char *mask2 = talloc_strdup(ctx, mask);
87
88	if (!mask2) {
89	return False;
90	}
91
92	if ((mode & aDIR) != 0) {
93	size = 0;
94	}
95
96	memset(buf+1,' ',11);
97	if ((p = strchr_m(mask2,'.')) != NULL) {
98	*p = 0;
99	push_ascii(buf+1,mask2,8, 0);
100	push_ascii(buf+9,p+1,3, 0);
101	*p = '.';
102	} else {
103	push_ascii(buf+1,mask2,11, 0);
104	}
105
106	memset(buf+21,'\0',DIR_STRUCT_SIZE-21);
107	SCVAL(buf,21,mode);
108	srv_put_dos_date(buf,22,date);
109	SSVAL(buf,26,size & 0xFFFF);
110	SSVAL(buf,28,(size >> 16)&0xFFFF);
111	/* We only uppercase if FLAGS2_LONG_PATH_COMPONENTS is zero in the input buf.
112	Strange, but verified on W2K3. Needed for OS/2. JRA. */
113	push_ascii(buf+30,fname,12, uc ? STR_UPPER : 0);
114	DEBUG(8,("put name [%s] from [%s] into dir struct\n",buf+30, fname));
115	return True;
116	}
117
118	/****************************************************************************
119	Initialise the dir bitmap.
120	****************************************************************************/
121
122	void init_dptrs(void)
123	{
124	static bool dptrs_init=False;
125
126	if (dptrs_init)
127	return;
128
129	dptr_bmap = bitmap_allocate(MAX_DIRECTORY_HANDLES);
130
131	if (!dptr_bmap)
132	exit_server("out of memory in init_dptrs");
133
134	dptrs_init = True;
135	}
136
137	/****************************************************************************
138	Idle a dptr - the directory is closed but the control info is kept.
139	****************************************************************************/
140
141	static void dptr_idle(struct dptr_struct *dptr)
142	{
143	if (dptr->dir_hnd) {
144	DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
145	TALLOC_FREE(dptr->dir_hnd);
146	}
147	}
148
149	/****************************************************************************
150	Idle the oldest dptr.
151	****************************************************************************/
152
153	static void dptr_idleoldest(void)
154	{
155	struct dptr_struct *dptr;
156
157	/*
158	* Go to the end of the list.
159	*/
160	for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
161	;
162
163	if(!dptr) {
164	DEBUG(0,("No dptrs available to idle ?\n"));
165	return;
166	}
167
168	/*
169	* Idle the oldest pointer.
170	*/
171
172	for(; dptr; dptr = dptr->prev) {
173	if (dptr->dir_hnd) {
174	dptr_idle(dptr);
175	return;
176	}
177	}
178	}
179
180	/****************************************************************************
181	Get the struct dptr_struct for a dir index.
182	****************************************************************************/
183
184	static struct dptr_struct *dptr_get(int key, bool forclose)
185	{
186	struct dptr_struct *dptr;
187
188	for(dptr = dirptrs; dptr; dptr = dptr->next) {
189	if(dptr->dnum == key) {
190	if (!forclose && !dptr->dir_hnd) {
191	if (dirhandles_open >= MAX_OPEN_DIRECTORIES)
192	dptr_idleoldest();
193	DEBUG(4,("dptr_get: Reopening dptr key %d\n",key));
194	if (!(dptr->dir_hnd = OpenDir(
195	NULL, dptr->conn, dptr->path,
196	dptr->wcard, dptr->attr))) {
197	DEBUG(4,("dptr_get: Failed to open %s (%s)\n",dptr->path,
198	strerror(errno)));
199	return False;
200	}
201	}
202	DLIST_PROMOTE(dirptrs,dptr);
203	return dptr;
204	}
205	}
206	return(NULL);
207	}
208
209	/****************************************************************************
210	Get the dir path for a dir index.
211	****************************************************************************/
212
213	char *dptr_path(int key)
214	{
215	struct dptr_struct *dptr = dptr_get(key, False);
216	if (dptr)
217	return(dptr->path);
218	return(NULL);
219	}
220
221	/****************************************************************************
222	Get the dir wcard for a dir index.
223	****************************************************************************/
224
225	char *dptr_wcard(int key)
226	{
227	struct dptr_struct *dptr = dptr_get(key, False);
228	if (dptr)
229	return(dptr->wcard);
230	return(NULL);
231	}
232
233	/****************************************************************************
234	Get the dir attrib for a dir index.
235	****************************************************************************/
236
237	uint16 dptr_attr(int key)
238	{
239	struct dptr_struct *dptr = dptr_get(key, False);
240	if (dptr)
241	return(dptr->attr);
242	return(0);
243	}
244
245	/****************************************************************************
246	Close a dptr (internal func).
247	****************************************************************************/
248
249	static void dptr_close_internal(struct dptr_struct *dptr)
250	{
251	DEBUG(4,("closing dptr key %d\n",dptr->dnum));
252
253	DLIST_REMOVE(dirptrs, dptr);
254
255	/*
256	* Free the dnum in the bitmap. Remember the dnum value is always
257	* biased by one with respect to the bitmap.
258	*/
259
260	if(bitmap_query( dptr_bmap, dptr->dnum - 1) != True) {
261	DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
262	dptr->dnum ));
263	}
264
265	bitmap_clear(dptr_bmap, dptr->dnum - 1);
266
267	TALLOC_FREE(dptr->dir_hnd);
268
269	/* Lanman 2 specific code */
270	SAFE_FREE(dptr->wcard);
271	string_set(&dptr->path,"");
272	SAFE_FREE(dptr);
273	}
274
275	/****************************************************************************
276	Close a dptr given a key.
277	****************************************************************************/
278
279	void dptr_close(int *key)
280	{
281	struct dptr_struct *dptr;
282
283	if(*key == INVALID_DPTR_KEY)
284	return;
285
286	/* OS/2 seems to use -1 to indicate "close all directories" */
287	if (*key == -1) {
288	struct dptr_struct *next;
289	for(dptr = dirptrs; dptr; dptr = next) {
290	next = dptr->next;
291	dptr_close_internal(dptr);
292	}
293	*key = INVALID_DPTR_KEY;
294	return;
295	}
296
297	dptr = dptr_get(*key, True);
298
299	if (!dptr) {
300	DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
301	return;
302	}
303
304	dptr_close_internal(dptr);
305
306	*key = INVALID_DPTR_KEY;
307	}
308
309	/****************************************************************************
310	Close all dptrs for a cnum.
311	****************************************************************************/
312
313	void dptr_closecnum(connection_struct *conn)
314	{
315	struct dptr_struct dptr, next;
316	for(dptr = dirptrs; dptr; dptr = next) {
317	next = dptr->next;
318	if (dptr->conn == conn)
319	dptr_close_internal(dptr);
320	}
321	}
322
323	/****************************************************************************
324	Idle all dptrs for a cnum.
325	****************************************************************************/
326
327	void dptr_idlecnum(connection_struct *conn)
328	{
329	struct dptr_struct *dptr;
330	for(dptr = dirptrs; dptr; dptr = dptr->next) {
331	if (dptr->conn == conn && dptr->dir_hnd)
332	dptr_idle(dptr);
333	}
334	}
335
336	/****************************************************************************
337	Close a dptr that matches a given path, only if it matches the spid also.
338	****************************************************************************/
339
340	void dptr_closepath(char *path,uint16 spid)
341	{
342	struct dptr_struct dptr, next;
343	for(dptr = dirptrs; dptr; dptr = next) {
344	next = dptr->next;
345	if (spid == dptr->spid && strequal(dptr->path,path))
346	dptr_close_internal(dptr);
347	}
348	}
349
350	/****************************************************************************
351	Try and close the oldest handle not marked for
352	expect close in the hope that the client has
353	finished with that one.
354	****************************************************************************/
355
356	static void dptr_close_oldest(bool old)
357	{
358	struct dptr_struct *dptr;
359
360	/*
361	* Go to the end of the list.
362	*/
363	for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
364	;
365
366	if(!dptr) {
367	DEBUG(0,("No old dptrs available to close oldest ?\n"));
368	return;
369	}
370
371	/*
372	* If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
373	* does not have expect_close set. If 'old' is false, close
374	* one of the new dnum handles.
375	*/
376
377	for(; dptr; dptr = dptr->prev) {
378	if ((old && (dptr->dnum < 256) && !dptr->expect_close) \|\|
379	(!old && (dptr->dnum > 255))) {
380	dptr_close_internal(dptr);
381	return;
382	}
383	}
384	}
385
386	/****************************************************************************
387	Create a new dir ptr. If the flag old_handle is true then we must allocate
388	from the bitmap range 0 - 255 as old SMBsearch directory handles are only
389	one byte long. If old_handle is false we allocate from the range
390	256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
391	a directory handle is never zero.
392	wcard must not be zero.
393	****************************************************************************/
394
395	NTSTATUS dptr_create(connection_struct conn, const char path, bool old_handle, bool expect_close,uint16 spid,
396	const char wcard, bool wcard_has_wild, uint32 attr, struct dptr_struct *dptr_ret)
397	{
398	struct dptr_struct *dptr = NULL;
399	struct smb_Dir *dir_hnd;
400	NTSTATUS status;
401
402	DEBUG(5,("dptr_create dir=%s\n", path));
403
404	if (!wcard) {
405	return NT_STATUS_INVALID_PARAMETER;
406	}
407
408	status = check_name(conn,path);
409	if (!NT_STATUS_IS_OK(status)) {
410	return status;
411	}
412
413	dir_hnd = OpenDir(NULL, conn, path, wcard, attr);
414	if (!dir_hnd) {
415	return map_nt_error_from_unix(errno);
416	}
417
418	string_set(&conn->dirpath,path);
419
420	if (dirhandles_open >= MAX_OPEN_DIRECTORIES) {
421	dptr_idleoldest();
422	}
423
424	dptr = SMB_MALLOC_P(struct dptr_struct);
425	if(!dptr) {
426	DEBUG(0,("malloc fail in dptr_create.\n"));
427	TALLOC_FREE(dir_hnd);
428	return NT_STATUS_NO_MEMORY;
429	}
430
431	ZERO_STRUCTP(dptr);
432
433	if(old_handle) {
434
435	/*
436	* This is an old-style SMBsearch request. Ensure the
437	* value we return will fit in the range 1-255.
438	*/
439
440	dptr->dnum = bitmap_find(dptr_bmap, 0);
441
442	if(dptr->dnum == -1 \|\| dptr->dnum > 254) {
443
444	/*
445	* Try and close the oldest handle not marked for
446	* expect close in the hope that the client has
447	* finished with that one.
448	*/
449
450	dptr_close_oldest(True);
451
452	/* Now try again... */
453	dptr->dnum = bitmap_find(dptr_bmap, 0);
454	if(dptr->dnum == -1 \|\| dptr->dnum > 254) {
455	DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
456	SAFE_FREE(dptr);
457	TALLOC_FREE(dir_hnd);
458	return NT_STATUS_TOO_MANY_OPENED_FILES;
459	}
460	}
461	} else {
462
463	/*
464	* This is a new-style trans2 request. Allocate from
465	* a range that will return 256 - MAX_DIRECTORY_HANDLES.
466	*/
467
468	dptr->dnum = bitmap_find(dptr_bmap, 255);
469
470	if(dptr->dnum == -1 \|\| dptr->dnum < 255) {
471
472	/*
473	* Try and close the oldest handle close in the hope that
474	* the client has finished with that one. This will only
475	* happen in the case of the Win98 client bug where it leaks
476	* directory handles.
477	*/
478
479	dptr_close_oldest(False);
480
481	/* Now try again... */
482	dptr->dnum = bitmap_find(dptr_bmap, 255);
483
484	if(dptr->dnum == -1 \|\| dptr->dnum < 255) {
485	DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
486	SAFE_FREE(dptr);
487	TALLOC_FREE(dir_hnd);
488	return NT_STATUS_TOO_MANY_OPENED_FILES;
489	}
490	}
491	}
492
493	bitmap_set(dptr_bmap, dptr->dnum);
494
495	dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */
496
497	string_set(&dptr->path,path);
498	dptr->conn = conn;
499	dptr->dir_hnd = dir_hnd;
500	dptr->spid = spid;
501	dptr->expect_close = expect_close;
502	dptr->wcard = SMB_STRDUP(wcard);
503	if (!dptr->wcard) {
504	bitmap_clear(dptr_bmap, dptr->dnum - 1);
505	SAFE_FREE(dptr);
506	TALLOC_FREE(dir_hnd);
507	return NT_STATUS_NO_MEMORY;
508	}
509	if (lp_posix_pathnames() \|\| (wcard[0] == '.' && wcard[1] == 0)) {
510	dptr->has_wild = True;
511	} else {
512	dptr->has_wild = wcard_has_wild;
513	}
514
515	dptr->attr = attr;
516
517	DLIST_ADD(dirptrs, dptr);
518
519	DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
520	dptr->dnum,path,expect_close));
521
522	*dptr_ret = dptr;
523
524	return NT_STATUS_OK;
525	}
526
527
528	/****************************************************************************
529	Wrapper functions to access the lower level directory handles.
530	****************************************************************************/
531
532	int dptr_CloseDir(struct dptr_struct *dptr)
533	{
534	DLIST_REMOVE(dirptrs, dptr);
535	TALLOC_FREE(dptr->dir_hnd);
536	return 0;
537	}
538
539	void dptr_SeekDir(struct dptr_struct *dptr, long offset)
540	{
541	SeekDir(dptr->dir_hnd, offset);
542	}
543
544	long dptr_TellDir(struct dptr_struct *dptr)
545	{
546	return TellDir(dptr->dir_hnd);
547	}
548
549	bool dptr_has_wild(struct dptr_struct *dptr)
550	{
551	return dptr->has_wild;
552	}
553
554	int dptr_dnum(struct dptr_struct *dptr)
555	{
556	return dptr->dnum;
557	}
558
559	/****************************************************************************
560	Return the next visible file name, skipping veto'd and invisible files.
561	****************************************************************************/
562
563	static const char dptr_normal_ReadDirName(struct dptr_struct dptr, long poffset, SMB_STRUCT_STAT pst)
564	{
565	/* Normal search for the next file. */
566	const char *name;
567	while ((name = ReadDirName(dptr->dir_hnd, poffset)) != NULL) {
568	if (is_visible_file(dptr->conn, dptr->path, name, pst, True)) {
569	return name;
570	}
571	}
572	return NULL;
573	}
574
575	/****************************************************************************
576	Return the next visible file name, skipping veto'd and invisible files.
577	****************************************************************************/
578
579	const char dptr_ReadDirName(TALLOC_CTX ctx,
580	struct dptr_struct *dptr,
581	long *poffset,
582	SMB_STRUCT_STAT *pst)
583	{
584	SET_STAT_INVALID(*pst);
585
586	if (dptr->has_wild) {
587	return dptr_normal_ReadDirName(dptr, poffset, pst);
588	}
589
590	/* If poffset is -1 then we know we returned this name before and we have
591	no wildcards. We're at the end of the directory. */
592	if (*poffset == END_OF_DIRECTORY_OFFSET) {
593	return NULL;
594	}
595
596	if (!dptr->did_stat) {
597	char *pathreal = NULL;
598
599	/* We know the stored wcard contains no wildcard characters. See if we can match
600	with a stat call. If we can't, then set did_stat to true to
601	ensure we only do this once and keep searching. */
602
603	dptr->did_stat = True;
604
605	/* First check if it should be visible. */
606	if (!is_visible_file(dptr->conn, dptr->path, dptr->wcard, pst, True)) {
607	/* This only returns False if the file was found, but
608	is explicitly not visible. Set us to end of directory,
609	but return NULL as we know we can't ever find it. */
610	dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
611	return NULL;
612	}
613
614	if (VALID_STAT(*pst)) {
615	/* We need to set the underlying dir_hnd offset to -1 also as
616	this function is usually called with the output from TellDir. */
617	dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
618	return dptr->wcard;
619	}
620
621	pathreal = talloc_asprintf(ctx,
622	"%s/%s",
623	dptr->path,
624	dptr->wcard);
625	if (!pathreal) {
626	return NULL;
627	}
628
629	if (SMB_VFS_STAT(dptr->conn,pathreal,pst) == 0) {
630	/* We need to set the underlying dir_hnd offset to -1 also as
631	this function is usually called with the output from TellDir. */
632	dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
633	TALLOC_FREE(pathreal);
634	return dptr->wcard;
635	} else {
636	/* If we get any other error than ENOENT or ENOTDIR
637	then the file exists we just can't stat it. */
638	if (errno == ENOTDIR)
639	DEBUG( 0, ( "PS - ENOTDIR2\n" ) );
640
641	if (errno != ENOENT && errno != ENOTDIR) {
642	/* We need to set the underlying dir_hdn offset to -1 also as
643	this function is usually called with the output from TellDir. */
644	dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
645	TALLOC_FREE(pathreal);
646	return dptr->wcard;
647	}
648	}
649
650	TALLOC_FREE(pathreal);
651
652	/* Stat failed. We know this is authoratiative if we are
653	* providing case sensitive semantics or the underlying
654	* filesystem is case sensitive.
655	*/
656
657	if (dptr->conn->case_sensitive \|\|
658	!(dptr->conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
659	/* We need to set the underlying dir_hnd offset to -1 also as
660	this function is usually called with the output from TellDir. */
661	dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
662	return NULL;
663	}
664	}
665	return dptr_normal_ReadDirName(dptr, poffset, pst);
666	}
667
668	/****************************************************************************
669	Search for a file by name, skipping veto'ed and not visible files.
670	****************************************************************************/
671
672	bool dptr_SearchDir(struct dptr_struct dptr, const char name, long poffset, SMB_STRUCT_STAT pst)
673	{
674	SET_STAT_INVALID(*pst);
675
676	if (!dptr->has_wild && (dptr->dir_hnd->offset == END_OF_DIRECTORY_OFFSET)) {
677	/* This is a singleton directory and we're already at the end. */
678	*poffset = END_OF_DIRECTORY_OFFSET;
679	return False;
680	}
681
682	return SearchDir(dptr->dir_hnd, name, poffset);
683	}
684
685	/****************************************************************************
686	Add the name we're returning into the underlying cache.
687	****************************************************************************/
688
689	void dptr_DirCacheAdd(struct dptr_struct dptr, const char name, long offset)
690	{
691	DirCacheAdd(dptr->dir_hnd, name, offset);
692	}
693
694	/****************************************************************************
695	Fill the 5 byte server reserved dptr field.
696	****************************************************************************/
697
698	bool dptr_fill(char *buf1,unsigned int key)
699	{
700	unsigned char buf = (unsigned char )buf1;
701	struct dptr_struct *dptr = dptr_get(key, False);
702	uint32 offset;
703	if (!dptr) {
704	DEBUG(1,("filling null dirptr %d\n",key));
705	return(False);
706	}
707	offset = (uint32)TellDir(dptr->dir_hnd);
708	DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
709	(long)dptr->dir_hnd,(int)offset));
710	buf[0] = key;
711	SIVAL(buf,1,offset);
712	return(True);
713	}
714
715	/****************************************************************************
716	Fetch the dir ptr and seek it given the 5 byte server field.
717	****************************************************************************/
718
719	struct dptr_struct dptr_fetch(char buf,int *num)
720	{
721	unsigned int key = (unsigned char )buf;
722	struct dptr_struct *dptr = dptr_get(key, False);
723	uint32 offset;
724	long seekoff;
725
726	if (!dptr) {
727	DEBUG(3,("fetched null dirptr %d\n",key));
728	return(NULL);
729	}
730	*num = key;
731	offset = IVAL(buf,1);
732	if (offset == (uint32)-1) {
733	seekoff = END_OF_DIRECTORY_OFFSET;
734	} else {
735	seekoff = (long)offset;
736	}
737	SeekDir(dptr->dir_hnd,seekoff);
738	DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
739	key,dptr_path(key),(int)seekoff));
740	return(dptr);
741	}
742
743	/****************************************************************************
744	Fetch the dir ptr.
745	****************************************************************************/
746
747	struct dptr_struct *dptr_fetch_lanman2(int dptr_num)
748	{
749	struct dptr_struct *dptr = dptr_get(dptr_num, False);
750
751	if (!dptr) {
752	DEBUG(3,("fetched null dirptr %d\n",dptr_num));
753	return(NULL);
754	}
755	DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
756	return(dptr);
757	}
758
759	/****************************************************************************
760	Check that a file matches a particular file type.
761	****************************************************************************/
762
763	bool dir_check_ftype(connection_struct *conn, uint32 mode, uint32 dirtype)
764	{
765	uint32 mask;
766
767	/* Check the "may have" search bits. */
768	if (((mode & ~dirtype) & (aHIDDEN \| aSYSTEM \| aDIR)) != 0)
769	return False;
770
771	/* Check the "must have" bits, which are the may have bits shifted eight */
772	/* If must have bit is set, the file/dir can not be returned in search unless the matching
773	file attribute is set */
774	mask = ((dirtype >> 8) & (aDIR\|aARCH\|aRONLY\|aHIDDEN\|aSYSTEM)); /* & 0x37 */
775	if(mask) {
776	if((mask & (mode & (aDIR\|aARCH\|aRONLY\|aHIDDEN\|aSYSTEM))) == mask) /* check if matching attribute present */
777	return True;
778	else
779	return False;
780	}
781
782	return True;
783	}
784
785	static bool mangle_mask_match(connection_struct *conn,
786	const char *filename,
787	const char *mask)
788	{
789	char mname[13];
790
791	if (!name_to_8_3(filename,mname,False,conn->params)) {
792	return False;
793	}
794	return mask_match_search(mname,mask,False);
795	}
796
797	/****************************************************************************
798	Get an 8.3 directory entry.
799	****************************************************************************/
800
801	bool get_dir_entry(TALLOC_CTX *ctx,
802	connection_struct *conn,
803	const char *mask,
804	uint32 dirtype,
805	char **pp_fname_out,
806	SMB_OFF_T *size,
807	uint32 *mode,
808	time_t *date,
809	bool check_descend,
810	bool ask_sharemode)
811	{
812	const char *dname = NULL;
813	bool found = False;
814	SMB_STRUCT_STAT sbuf;
815	char *pathreal = NULL;
816	const char *filename = NULL;
817	bool needslash;
818
819	*pp_fname_out = NULL;
820
821	needslash = ( conn->dirpath[strlen(conn->dirpath) -1] != '/');
822
823	if (!conn->dirptr) {
824	return(False);
825	}
826
827	while (!found) {
828	long curoff = dptr_TellDir(conn->dirptr);
829	dname = dptr_ReadDirName(ctx, conn->dirptr, &curoff, &sbuf);
830
831	DEBUG(6,("readdir on dirptr 0x%lx now at offset %ld\n",
832	(long)conn->dirptr,TellDir(conn->dirptr->dir_hnd)));
833
834	if (dname == NULL) {
835	return(False);
836	}
837
838	filename = dname;
839
840	/* notice the special . handling. This appears to be the only difference
841	between the wildcard handling in this routine and in the trans2 routines.
842	see masktest for a demo
843	*/
844	if ((strcmp(mask,".") == 0) \|\|
845	mask_match_search(filename,mask,False) \|\|
846	mangle_mask_match(conn,filename,mask)) {
847	char mname[13];
848
849	if (!mangle_is_8_3(filename, False, conn->params)) {
850	if (!name_to_8_3(filename,mname,False,
851	conn->params)) {
852	continue;
853	}
854	filename = mname;
855	}
856
857	if (needslash) {
858	pathreal = talloc_asprintf(ctx,
859	"%s/%s",
860	conn->dirpath,
861	dname);
862	} else {
863	pathreal = talloc_asprintf(ctx,
864	"%s%s",
865	conn->dirpath,
866	dname);
867	}
868	if (!pathreal) {
869	return False;
870	}
871
872	if (!VALID_STAT(sbuf) && (SMB_VFS_STAT(conn, pathreal, &sbuf)) != 0) {
873	DEBUG(5,("Couldn't stat 1 [%s]. Error = %s\n",
874	pathreal, strerror(errno) ));
875	TALLOC_FREE(pathreal);
876	continue;
877	}
878
879	*mode = dos_mode(conn,pathreal,&sbuf);
880
881	if (!dir_check_ftype(conn,*mode,dirtype)) {
882	DEBUG(5,("[%s] attribs 0x%x didn't match 0x%x\n",filename,(unsigned int)*mode,(unsigned int)dirtype));
883	TALLOC_FREE(pathreal);
884	continue;
885	}
886
887	*size = sbuf.st_size;
888	*date = sbuf.st_mtime;
889
890	if (ask_sharemode) {
891	struct timespec write_time_ts;
892	struct file_id fileid;
893
894	fileid = vfs_file_id_from_sbuf(conn, &sbuf);
895	get_file_infos(fileid, NULL, &write_time_ts);
896	if (!null_timespec(write_time_ts)) {
897	*date = convert_timespec_to_time_t(write_time_ts);
898	}
899	}
900
901	DEBUG(3,("get_dir_entry mask=[%s] found %s "
902	"fname=%s (%s)\n",
903	mask,
904	pathreal,
905	dname,
906	filename));
907
908	found = True;
909
910	*pp_fname_out = talloc_strdup(ctx, filename);
911	if (!*pp_fname_out) {
912	return False;
913	}
914
915	DirCacheAdd(conn->dirptr->dir_hnd, dname, curoff);
916	TALLOC_FREE(pathreal);
917	}
918	}
919
920	return(found);
921	}
922
923	/*******************************************************************
924	Check to see if a user can read a file. This is only approximate,
925	it is used as part of the "hide unreadable" option. Don't
926	use it for anything security sensitive.
927	********************************************************************/
928
929	static bool user_can_read_file(connection_struct conn, char name, SMB_STRUCT_STAT *pst)
930	{
931	SEC_DESC *psd = NULL;
932	files_struct *fsp;
933	NTSTATUS status;
934	uint32 access_granted;
935
936	/*
937	* If user is a member of the Admin group
938	* we never hide files from them.
939	*/
940
941	if (conn->admin_user) {
942	return True;
943	}
944
945	SMB_ASSERT(VALID_STAT(*pst));
946
947	/* Pseudo-open the file (note - no fd's created). */
948
949	if(S_ISDIR(pst->st_mode)) {
950	status = open_directory(conn, NULL, name, pst,
951	READ_CONTROL_ACCESS,
952	FILE_SHARE_READ\|FILE_SHARE_WRITE,
953	FILE_OPEN,
954	0, /* no create options. */
955	FILE_ATTRIBUTE_DIRECTORY,
956	NULL, &fsp);
957	} else {
958	status = open_file_stat(conn, NULL, name, pst, &fsp);
959	}
960
961	if (!NT_STATUS_IS_OK(status)) {
962	return False;
963	}
964
965	/* Get NT ACL -allocated in main loop talloc context. No free needed here. */
966	status = SMB_VFS_FGET_NT_ACL(fsp,
967	(OWNER_SECURITY_INFORMATION\|GROUP_SECURITY_INFORMATION\|DACL_SECURITY_INFORMATION), &psd);
968	close_file(fsp, NORMAL_CLOSE);
969
970	/* No access if SD get failed. */
971	if (!NT_STATUS_IS_OK(status)) {
972	return False;
973	}
974
975	return se_access_check(psd, current_user.nt_user_token, FILE_READ_DATA,
976	&access_granted, &status);
977	}
978
979	/*******************************************************************
980	Check to see if a user can write a file (and only files, we do not
981	check dirs on this one). This is only approximate,
982	it is used as part of the "hide unwriteable" option. Don't
983	use it for anything security sensitive.
984	********************************************************************/
985
986	static bool user_can_write_file(connection_struct conn, char name, SMB_STRUCT_STAT *pst)
987	{
988	SEC_DESC *psd = NULL;
989	files_struct *fsp;
990	int info;
991	NTSTATUS status;
992	uint32 access_granted;
993
994	/*
995	* If user is a member of the Admin group
996	* we never hide files from them.
997	*/
998
999	if (conn->admin_user) {
1000	return True;
1001	}
1002
1003	SMB_ASSERT(VALID_STAT(*pst));
1004
1005	/* Pseudo-open the file */
1006
1007	if(S_ISDIR(pst->st_mode)) {
1008	return True;
1009	} else {
1010	status = open_file_ntcreate(conn, NULL, name, pst,
1011	FILE_WRITE_ATTRIBUTES,
1012	FILE_SHARE_READ\|FILE_SHARE_WRITE,
1013	FILE_OPEN,
1014	0,
1015	FILE_ATTRIBUTE_NORMAL,
1016	INTERNAL_OPEN_ONLY,
1017	&info, &fsp);
1018	}
1019
1020	if (!NT_STATUS_IS_OK(status)) {
1021	return False;
1022	}
1023
1024	/* Get NT ACL -allocated in main loop talloc context. No free needed here. */
1025	status = SMB_VFS_FGET_NT_ACL(fsp,
1026	(OWNER_SECURITY_INFORMATION\|GROUP_SECURITY_INFORMATION\|DACL_SECURITY_INFORMATION), &psd);
1027	close_file(fsp, NORMAL_CLOSE);
1028
1029	/* No access if SD get failed. */
1030	if (!NT_STATUS_IS_OK(status)) {
1031	return False;
1032	}
1033
1034	return se_access_check(psd, current_user.nt_user_token, FILE_WRITE_DATA,
1035	&access_granted, &status);
1036	}
1037
1038	/*******************************************************************
1039	Is a file a "special" type ?
1040	********************************************************************/
1041
1042	static bool file_is_special(connection_struct conn, char name, SMB_STRUCT_STAT *pst)
1043	{
1044	/*
1045	* If user is a member of the Admin group
1046	* we never hide files from them.
1047	*/
1048
1049	if (conn->admin_user)
1050	return False;
1051
1052	SMB_ASSERT(VALID_STAT(*pst));
1053
1054	if (S_ISREG(pst->st_mode) \|\| S_ISDIR(pst->st_mode) \|\| S_ISLNK(pst->st_mode))
1055	return False;
1056
1057	return True;
1058	}
1059
1060	/*******************************************************************
1061	Should the file be seen by the client ? NOTE: A successful return
1062	is no guarantee of the file's existence ... you also have to check
1063	whether pst is valid.
1064	********************************************************************/
1065
1066	bool is_visible_file(connection_struct conn, const char dir_path, const char name, SMB_STRUCT_STAT pst, bool use_veto)
1067	{
1068	bool hide_unreadable = lp_hideunreadable(SNUM(conn));
1069	bool hide_unwriteable = lp_hideunwriteable_files(SNUM(conn));
1070	bool hide_special = lp_hide_special_files(SNUM(conn));
1071
1072	SET_STAT_INVALID(*pst);
1073
1074	if ((strcmp(".",name) == 0) \|\| (strcmp("..",name) == 0)) {
1075	return True; /* . and .. are always visible. */
1076	}
1077
1078	/* If it's a vetoed file, pretend it doesn't even exist */
1079	if (use_veto && IS_VETO_PATH(conn, name)) {
1080	DEBUG(10,("is_visible_file: file %s is vetoed.\n", name ));
1081	return False;
1082	}
1083
1084	if (hide_unreadable \|\| hide_unwriteable \|\| hide_special) {
1085	char *entry = NULL;
1086
1087	if (asprintf(&entry, "%s/%s", dir_path, name) == -1) {
1088	return False;
1089	}
1090
1091	/* If it's a dfs symlink, ignore _hide xxxx_ options */
1092	if (lp_host_msdfs() &&
1093	lp_msdfs_root(SNUM(conn)) &&
1094	is_msdfs_link(conn, entry, NULL)) {
1095	SAFE_FREE(entry);
1096	return True;
1097	}
1098
1099	/* If the file name does not exist, there's no point checking
1100	* the configuration options. We succeed, on the basis that the
1101	* checks might have passed if the file was present.
1102	*/
1103	if (SMB_VFS_STAT(conn, entry, pst) != 0) {
1104	SAFE_FREE(entry);
1105	return True;
1106	}
1107
1108	/* Honour _hide unreadable_ option */
1109	if (hide_unreadable && !user_can_read_file(conn, entry, pst)) {
1110	DEBUG(10,("is_visible_file: file %s is unreadable.\n", entry ));
1111	SAFE_FREE(entry);
1112	return False;
1113	}
1114	/* Honour _hide unwriteable_ option */
1115	if (hide_unwriteable && !user_can_write_file(conn, entry, pst)) {
1116	DEBUG(10,("is_visible_file: file %s is unwritable.\n", entry ));
1117	SAFE_FREE(entry);
1118	return False;
1119	}
1120	/* Honour _hide_special_ option */
1121	if (hide_special && file_is_special(conn, entry, pst)) {
1122	DEBUG(10,("is_visible_file: file %s is special.\n", entry ));
1123	SAFE_FREE(entry);
1124	return False;
1125	}
1126	SAFE_FREE(entry);
1127	}
1128	return True;
1129	}
1130
1131	static int smb_Dir_destructor(struct smb_Dir *dirp)
1132	{
1133	if (dirp->dir) {
1134	SMB_VFS_CLOSEDIR(dirp->conn,dirp->dir);
1135	}
1136	dirhandles_open--;
1137	return 0;
1138	}
1139
1140	/*******************************************************************
1141	Open a directory.
1142	********************************************************************/
1143
1144	struct smb_Dir OpenDir(TALLOC_CTX mem_ctx, connection_struct *conn,
1145	const char name, const char mask, uint32 attr)
1146	{
1147	struct smb_Dir *dirp = TALLOC_ZERO_P(mem_ctx, struct smb_Dir);
1148
1149	if (!dirp) {
1150	return NULL;
1151	}
1152
1153	dirp->conn = conn;
1154	dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1155
1156	dirp->dir_path = talloc_strdup(dirp, name);
1157	if (!dirp->dir_path) {
1158	errno = ENOMEM;
1159	goto fail;
1160	}
1161
1162	dirhandles_open++;
1163	talloc_set_destructor(dirp, smb_Dir_destructor);
1164
1165	dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1166	if (!dirp->dir) {
1167	DEBUG(5,("OpenDir: Can't open %s. %s\n", dirp->dir_path,
1168	strerror(errno) ));
1169	goto fail;
1170	}
1171
1172	return dirp;
1173
1174	fail:
1175	TALLOC_FREE(dirp);
1176	return NULL;
1177	}
1178
1179	/*******************************************************************
1180	Read from a directory. Also return current offset.
1181	Don't check for veto or invisible files.
1182	********************************************************************/
1183
1184	const char ReadDirName(struct smb_Dir dirp, long *poffset)
1185	{
1186	const char *n;
1187	connection_struct *conn = dirp->conn;
1188
1189	/* Cheat to allow . and .. to be the first entries returned. */
1190	if (((poffset == START_OF_DIRECTORY_OFFSET) \|\| (poffset == DOT_DOT_DIRECTORY_OFFSET)) && (dirp->file_number < 2)) {
1191	if (dirp->file_number == 0) {
1192	n = ".";
1193	*poffset = dirp->offset = START_OF_DIRECTORY_OFFSET;
1194	} else {
1195	*poffset = dirp->offset = DOT_DOT_DIRECTORY_OFFSET;
1196	n = "..";
1197	}
1198	dirp->file_number++;
1199	return n;
1200	} else if (*poffset == END_OF_DIRECTORY_OFFSET) {
1201	*poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1202	return NULL;
1203	} else {
1204	/* A real offset, seek to it. */
1205	SeekDir(dirp, *poffset);
1206	}
1207
1208	while ((n = vfs_readdirname(conn, dirp->dir))) {
1209	/* Ignore . and .. - we've already returned them. */
1210	if (*n == '.') {
1211	if ((n[1] == '\0') \|\| (n[1] == '.' && n[2] == '\0')) {
1212	continue;
1213	}
1214	}
1215	*poffset = dirp->offset = SMB_VFS_TELLDIR(conn, dirp->dir);
1216	dirp->file_number++;
1217	return n;
1218	}
1219	*poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1220	return NULL;
1221	}
1222
1223	/*******************************************************************
1224	Rewind to the start.
1225	********************************************************************/
1226
1227	void RewindDir(struct smb_Dir dirp, long poffset)
1228	{
1229	SMB_VFS_REWINDDIR(dirp->conn, dirp->dir);
1230	dirp->file_number = 0;
1231	dirp->offset = START_OF_DIRECTORY_OFFSET;
1232	*poffset = START_OF_DIRECTORY_OFFSET;
1233	}
1234
1235	/*******************************************************************
1236	Seek a dir.
1237	********************************************************************/
1238
1239	void SeekDir(struct smb_Dir *dirp, long offset)
1240	{
1241	if (offset != dirp->offset) {
1242	if (offset == START_OF_DIRECTORY_OFFSET) {
1243	RewindDir(dirp, &offset);
1244	/*
1245	* Ok we should really set the file number here
1246	* to 1 to enable ".." to be returned next. Trouble
1247	* is I'm worried about callers using SeekDir(dirp,0)
1248	* as equivalent to RewindDir(). So leave this alone
1249	* for now.
1250	*/
1251	} else if (offset == DOT_DOT_DIRECTORY_OFFSET) {
1252	RewindDir(dirp, &offset);
1253	/*
1254	* Set the file number to 2 - we want to get the first
1255	* real file entry (the one we return after "..")
1256	* on the next ReadDir.
1257	*/
1258	dirp->file_number = 2;
1259	} else if (offset == END_OF_DIRECTORY_OFFSET) {
1260	; /* Don't seek in this case. */
1261	} else {
1262	SMB_VFS_SEEKDIR(dirp->conn, dirp->dir, offset);
1263	}
1264	dirp->offset = offset;
1265	}
1266	}
1267
1268	/*******************************************************************
1269	Tell a dir position.
1270	********************************************************************/
1271
1272	long TellDir(struct smb_Dir *dirp)
1273	{
1274	return(dirp->offset);
1275	}
1276
1277	/*******************************************************************
1278	Add an entry into the dcache.
1279	********************************************************************/
1280
1281	void DirCacheAdd(struct smb_Dir dirp, const char name, long offset)
1282	{
1283	struct name_cache_entry *e;
1284
1285	if (dirp->name_cache_size == 0) {
1286	return;
1287	}
1288
1289	if (dirp->name_cache == NULL) {
1290	dirp->name_cache = TALLOC_ZERO_ARRAY(
1291	dirp, struct name_cache_entry, dirp->name_cache_size);
1292
1293	if (dirp->name_cache == NULL) {
1294	return;
1295	}
1296	}
1297
1298	dirp->name_cache_index = (dirp->name_cache_index+1) %
1299	dirp->name_cache_size;
1300	e = &dirp->name_cache[dirp->name_cache_index];
1301	TALLOC_FREE(e->name);
1302	e->name = talloc_strdup(dirp, name);
1303	e->offset = offset;
1304	}
1305
1306	/*******************************************************************
1307	Find an entry by name. Leave us at the offset after it.
1308	Don't check for veto or invisible files.
1309	********************************************************************/
1310
1311	bool SearchDir(struct smb_Dir dirp, const char name, long *poffset)
1312	{
1313	int i;
1314	const char *entry;
1315	connection_struct *conn = dirp->conn;
1316
1317	/* Search back in the name cache. */
1318	if (dirp->name_cache_size && dirp->name_cache) {
1319	for (i = dirp->name_cache_index; i >= 0; i--) {
1320	struct name_cache_entry *e = &dirp->name_cache[i];
1321	if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1322	*poffset = e->offset;
1323	SeekDir(dirp, e->offset);
1324	return True;
1325	}
1326	}
1327	for (i = dirp->name_cache_size - 1; i > dirp->name_cache_index; i--) {
1328	struct name_cache_entry *e = &dirp->name_cache[i];
1329	if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1330	*poffset = e->offset;
1331	SeekDir(dirp, e->offset);
1332	return True;
1333	}
1334	}
1335	}
1336
1337	/* Not found in the name cache. Rewind directory and start from scratch. */
1338	SMB_VFS_REWINDDIR(conn, dirp->dir);
1339	dirp->file_number = 0;
1340	*poffset = START_OF_DIRECTORY_OFFSET;
1341	while ((entry = ReadDirName(dirp, poffset))) {
1342	if (conn->case_sensitive ? (strcmp(entry, name) == 0) : strequal(entry, name)) {
1343	return True;
1344	}
1345	}
1346	return False;
1347	}
1348
1349	/*****************************************************************
1350	Is this directory empty ?
1351	*****************************************************************/
1352
1353	NTSTATUS can_delete_directory(struct connection_struct *conn,
1354	const char *dirname)
1355	{
1356	NTSTATUS status = NT_STATUS_OK;
1357	long dirpos = 0;
1358	const char *dname;
1359	struct smb_Dir *dir_hnd = OpenDir(talloc_tos(), conn, dirname,
1360	NULL, 0);
1361
1362	if (!dir_hnd) {
1363	return map_nt_error_from_unix(errno);
1364	}
1365
1366	while ((dname = ReadDirName(dir_hnd,&dirpos))) {
1367	SMB_STRUCT_STAT st;
1368
1369	/* Quick check for "." and ".." */
1370	if (dname[0] == '.') {
1371	if (!dname[1] \|\| (dname[1] == '.' && !dname[2])) {
1372	continue;
1373	}
1374	}
1375
1376	if (!is_visible_file(conn, dirname, dname, &st, True)) {
1377	continue;
1378	}
1379
1380	DEBUG(10,("can_delete_directory: got name %s - can't delete\n", dname ));
1381	status = NT_STATUS_DIRECTORY_NOT_EMPTY;
1382	break;
1383	}
1384	TALLOC_FREE(dir_hnd);
1385
1386	return status;
1387	}

Note: See TracBrowser for help on using the repository browser.

Download in other formats: