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source: vendor/3.6.9/source3/smbd/dir.c

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Last change on this file was 746, checked in by Silvan Scherrer, 13 years ago
Samba Server: updated vendor to 3.6.9
File size: 45.0 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	#include "system/filesys.h"
23	#include "smbd/smbd.h"
24	#include "smbd/globals.h"
25	#include "libcli/security/security.h"
26
27	/*
28	This module implements directory related functions for Samba.
29	*/
30
31	/* "Special" directory offsets. */
32	#define END_OF_DIRECTORY_OFFSET ((long)-1)
33	#define START_OF_DIRECTORY_OFFSET ((long)0)
34	#define DOT_DOT_DIRECTORY_OFFSET ((long)0x80000000)
35
36	/* Make directory handle internals available. */
37
38	struct name_cache_entry {
39	char *name;
40	long offset;
41	};
42
43	struct smb_Dir {
44	connection_struct *conn;
45	SMB_STRUCT_DIR *dir;
46	long offset;
47	char *dir_path;
48	size_t name_cache_size;
49	struct name_cache_entry *name_cache;
50	unsigned int name_cache_index;
51	unsigned int file_number;
52	};
53
54	struct dptr_struct {
55	struct dptr_struct next, prev;
56	int dnum;
57	uint16 spid;
58	struct connection_struct *conn;
59	struct smb_Dir *dir_hnd;
60	bool expect_close;
61	char *wcard;
62	uint32 attr;
63	char *path;
64	bool has_wild; /* Set to true if the wcard entry has MS wildcard characters in it. */
65	bool did_stat; /* Optimisation for non-wcard searches. */
66	};
67
68	static struct smb_Dir OpenDir_fsp(TALLOC_CTX mem_ctx, connection_struct *conn,
69	files_struct *fsp,
70	const char *mask,
71	uint32 attr);
72
73	#define INVALID_DPTR_KEY (-3)
74
75	/****************************************************************************
76	Make a dir struct.
77	****************************************************************************/
78
79	bool make_dir_struct(TALLOC_CTX *ctx,
80	char *buf,
81	const char *mask,
82	const char *fname,
83	SMB_OFF_T size,
84	uint32 mode,
85	time_t date,
86	bool uc)
87	{
88	char *p;
89	char *mask2 = talloc_strdup(ctx, mask);
90
91	if (!mask2) {
92	return False;
93	}
94
95	if ((mode & FILE_ATTRIBUTE_DIRECTORY) != 0) {
96	size = 0;
97	}
98
99	memset(buf+1,' ',11);
100	if ((p = strchr_m(mask2,'.')) != NULL) {
101	*p = 0;
102	push_ascii(buf+1,mask2,8, 0);
103	push_ascii(buf+9,p+1,3, 0);
104	*p = '.';
105	} else {
106	push_ascii(buf+1,mask2,11, 0);
107	}
108
109	memset(buf+21,'\0',DIR_STRUCT_SIZE-21);
110	SCVAL(buf,21,mode);
111	srv_put_dos_date(buf,22,date);
112	SSVAL(buf,26,size & 0xFFFF);
113	SSVAL(buf,28,(size >> 16)&0xFFFF);
114	/* We only uppercase if FLAGS2_LONG_PATH_COMPONENTS is zero in the input buf.
115	Strange, but verified on W2K3. Needed for OS/2. JRA. */
116	push_ascii(buf+30,fname,12, uc ? STR_UPPER : 0);
117	DEBUG(8,("put name [%s] from [%s] into dir struct\n",buf+30, fname));
118	return True;
119	}
120
121	/****************************************************************************
122	Initialise the dir bitmap.
123	****************************************************************************/
124
125	bool init_dptrs(struct smbd_server_connection *sconn)
126	{
127	if (sconn->searches.dptr_bmap) {
128	return true;
129	}
130
131	sconn->searches.dptr_bmap = bitmap_talloc(
132	sconn, MAX_DIRECTORY_HANDLES);
133
134	if (sconn->searches.dptr_bmap == NULL) {
135	return false;
136	}
137
138	return true;
139	}
140
141	/****************************************************************************
142	Idle a dptr - the directory is closed but the control info is kept.
143	****************************************************************************/
144
145	static void dptr_idle(struct dptr_struct *dptr)
146	{
147	if (dptr->dir_hnd) {
148	DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
149	TALLOC_FREE(dptr->dir_hnd);
150	}
151	}
152
153	/****************************************************************************
154	Idle the oldest dptr.
155	****************************************************************************/
156
157	static void dptr_idleoldest(struct smbd_server_connection *sconn)
158	{
159	struct dptr_struct *dptr;
160
161	/*
162	* Go to the end of the list.
163	*/
164	dptr = DLIST_TAIL(sconn->searches.dirptrs);
165
166	if(!dptr) {
167	DEBUG(0,("No dptrs available to idle ?\n"));
168	return;
169	}
170
171	/*
172	* Idle the oldest pointer.
173	*/
174
175	for(; dptr; dptr = DLIST_PREV(dptr)) {
176	if (dptr->dir_hnd) {
177	dptr_idle(dptr);
178	return;
179	}
180	}
181	}
182
183	/****************************************************************************
184	Get the struct dptr_struct for a dir index.
185	****************************************************************************/
186
187	static struct dptr_struct dptr_get(struct smbd_server_connection sconn,
188	int key, bool forclose)
189	{
190	struct dptr_struct *dptr;
191
192	for(dptr = sconn->searches.dirptrs; dptr; dptr = dptr->next) {
193	if(dptr->dnum == key) {
194	if (!forclose && !dptr->dir_hnd) {
195	if (sconn->searches.dirhandles_open >= MAX_OPEN_DIRECTORIES)
196	dptr_idleoldest(sconn);
197	DEBUG(4,("dptr_get: Reopening dptr key %d\n",key));
198	if (!(dptr->dir_hnd = OpenDir(
199	NULL, dptr->conn, dptr->path,
200	dptr->wcard, dptr->attr))) {
201	DEBUG(4,("dptr_get: Failed to open %s (%s)\n",dptr->path,
202	strerror(errno)));
203	return False;
204	}
205	}
206	DLIST_PROMOTE(sconn->searches.dirptrs,dptr);
207	return dptr;
208	}
209	}
210	return(NULL);
211	}
212
213	/****************************************************************************
214	Get the dir path for a dir index.
215	****************************************************************************/
216
217	char dptr_path(struct smbd_server_connection sconn, int key)
218	{
219	struct dptr_struct *dptr = dptr_get(sconn, key, false);
220	if (dptr)
221	return(dptr->path);
222	return(NULL);
223	}
224
225	/****************************************************************************
226	Get the dir wcard for a dir index.
227	****************************************************************************/
228
229	char dptr_wcard(struct smbd_server_connection sconn, int key)
230	{
231	struct dptr_struct *dptr = dptr_get(sconn, key, false);
232	if (dptr)
233	return(dptr->wcard);
234	return(NULL);
235	}
236
237	/****************************************************************************
238	Get the dir attrib for a dir index.
239	****************************************************************************/
240
241	uint16 dptr_attr(struct smbd_server_connection *sconn, int key)
242	{
243	struct dptr_struct *dptr = dptr_get(sconn, key, false);
244	if (dptr)
245	return(dptr->attr);
246	return(0);
247	}
248
249	/****************************************************************************
250	Close a dptr (internal func).
251	****************************************************************************/
252
253	static void dptr_close_internal(struct dptr_struct *dptr)
254	{
255	struct smbd_server_connection *sconn = dptr->conn->sconn;
256
257	DEBUG(4,("closing dptr key %d\n",dptr->dnum));
258
259	if (sconn == NULL) {
260	goto done;
261	}
262
263	if (sconn->using_smb2) {
264	goto done;
265	}
266
267	DLIST_REMOVE(sconn->searches.dirptrs, dptr);
268
269	/*
270	* Free the dnum in the bitmap. Remember the dnum value is always
271	* biased by one with respect to the bitmap.
272	*/
273
274	if (!bitmap_query(sconn->searches.dptr_bmap, dptr->dnum - 1)) {
275	DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
276	dptr->dnum ));
277	}
278
279	bitmap_clear(sconn->searches.dptr_bmap, dptr->dnum - 1);
280
281	done:
282	TALLOC_FREE(dptr->dir_hnd);
283
284	/* Lanman 2 specific code */
285	SAFE_FREE(dptr->wcard);
286	SAFE_FREE(dptr->path);
287	SAFE_FREE(dptr);
288	}
289
290	/****************************************************************************
291	Close a dptr given a key.
292	****************************************************************************/
293
294	void dptr_close(struct smbd_server_connection sconn, int key)
295	{
296	struct dptr_struct *dptr;
297
298	if(*key == INVALID_DPTR_KEY)
299	return;
300
301	/* OS/2 seems to use -1 to indicate "close all directories" */
302	if (*key == -1) {
303	struct dptr_struct *next;
304	for(dptr = sconn->searches.dirptrs; dptr; dptr = next) {
305	next = dptr->next;
306	dptr_close_internal(dptr);
307	}
308	*key = INVALID_DPTR_KEY;
309	return;
310	}
311
312	dptr = dptr_get(sconn, *key, true);
313
314	if (!dptr) {
315	DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
316	return;
317	}
318
319	dptr_close_internal(dptr);
320
321	*key = INVALID_DPTR_KEY;
322	}
323
324	/****************************************************************************
325	Close all dptrs for a cnum.
326	****************************************************************************/
327
328	void dptr_closecnum(connection_struct *conn)
329	{
330	struct dptr_struct dptr, next;
331	struct smbd_server_connection *sconn = conn->sconn;
332
333	if (sconn == NULL) {
334	return;
335	}
336
337	for(dptr = sconn->searches.dirptrs; dptr; dptr = next) {
338	next = dptr->next;
339	if (dptr->conn == conn) {
340	dptr_close_internal(dptr);
341	}
342	}
343	}
344
345	/****************************************************************************
346	Idle all dptrs for a cnum.
347	****************************************************************************/
348
349	void dptr_idlecnum(connection_struct *conn)
350	{
351	struct dptr_struct *dptr;
352	struct smbd_server_connection *sconn = conn->sconn;
353
354	if (sconn == NULL) {
355	return;
356	}
357
358	for(dptr = sconn->searches.dirptrs; dptr; dptr = dptr->next) {
359	if (dptr->conn == conn && dptr->dir_hnd) {
360	dptr_idle(dptr);
361	}
362	}
363	}
364
365	/****************************************************************************
366	Close a dptr that matches a given path, only if it matches the spid also.
367	****************************************************************************/
368
369	void dptr_closepath(struct smbd_server_connection *sconn,
370	char *path,uint16 spid)
371	{
372	struct dptr_struct dptr, next;
373	for(dptr = sconn->searches.dirptrs; dptr; dptr = next) {
374	next = dptr->next;
375	if (spid == dptr->spid && strequal(dptr->path,path))
376	dptr_close_internal(dptr);
377	}
378	}
379
380	/****************************************************************************
381	Try and close the oldest handle not marked for
382	expect close in the hope that the client has
383	finished with that one.
384	****************************************************************************/
385
386	static void dptr_close_oldest(struct smbd_server_connection *sconn,
387	bool old)
388	{
389	struct dptr_struct *dptr;
390
391	/*
392	* Go to the end of the list.
393	*/
394	for(dptr = sconn->searches.dirptrs; dptr && dptr->next; dptr = dptr->next)
395	;
396
397	if(!dptr) {
398	DEBUG(0,("No old dptrs available to close oldest ?\n"));
399	return;
400	}
401
402	/*
403	* If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
404	* does not have expect_close set. If 'old' is false, close
405	* one of the new dnum handles.
406	*/
407
408	for(; dptr; dptr = DLIST_PREV(dptr)) {
409	if ((old && (dptr->dnum < 256) && !dptr->expect_close) \|\|
410	(!old && (dptr->dnum > 255))) {
411	dptr_close_internal(dptr);
412	return;
413	}
414	}
415	}
416
417	/****************************************************************************
418	Create a new dir ptr. If the flag old_handle is true then we must allocate
419	from the bitmap range 0 - 255 as old SMBsearch directory handles are only
420	one byte long. If old_handle is false we allocate from the range
421	256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
422	a directory handle is never zero.
423	wcard must not be zero.
424	****************************************************************************/
425
426	NTSTATUS dptr_create(connection_struct conn, files_struct fsp,
427	const char *path, bool old_handle, bool expect_close,uint16 spid,
428	const char wcard, bool wcard_has_wild, uint32 attr, struct dptr_struct *dptr_ret)
429	{
430	struct smbd_server_connection *sconn = conn->sconn;
431	struct dptr_struct *dptr = NULL;
432	struct smb_Dir *dir_hnd;
433	NTSTATUS status;
434
435	if (fsp && fsp->is_directory && fsp->fh->fd != -1) {
436	path = fsp->fsp_name->base_name;
437	}
438
439	DEBUG(5,("dptr_create dir=%s\n", path));
440
441	if (sconn == NULL) {
442	DEBUG(0,("dptr_create: called with fake connection_struct\n"));
443	return NT_STATUS_INTERNAL_ERROR;
444	}
445
446	if (!wcard) {
447	return NT_STATUS_INVALID_PARAMETER;
448	}
449
450	if (fsp) {
451	dir_hnd = OpenDir_fsp(NULL, conn, fsp, wcard, attr);
452	} else {
453	status = check_name(conn,path);
454	if (!NT_STATUS_IS_OK(status)) {
455	return status;
456	}
457	dir_hnd = OpenDir(NULL, conn, path, wcard, attr);
458	}
459
460	if (!dir_hnd) {
461	return map_nt_error_from_unix(errno);
462	}
463
464	if (sconn->searches.dirhandles_open >= MAX_OPEN_DIRECTORIES) {
465	dptr_idleoldest(sconn);
466	}
467
468	dptr = SMB_MALLOC_P(struct dptr_struct);
469	if(!dptr) {
470	DEBUG(0,("malloc fail in dptr_create.\n"));
471	TALLOC_FREE(dir_hnd);
472	return NT_STATUS_NO_MEMORY;
473	}
474
475	ZERO_STRUCTP(dptr);
476
477	dptr->path = SMB_STRDUP(path);
478	if (!dptr->path) {
479	SAFE_FREE(dptr);
480	TALLOC_FREE(dir_hnd);
481	return NT_STATUS_NO_MEMORY;
482	}
483	dptr->conn = conn;
484	dptr->dir_hnd = dir_hnd;
485	dptr->spid = spid;
486	dptr->expect_close = expect_close;
487	dptr->wcard = SMB_STRDUP(wcard);
488	if (!dptr->wcard) {
489	SAFE_FREE(dptr->path);
490	SAFE_FREE(dptr);
491	TALLOC_FREE(dir_hnd);
492	return NT_STATUS_NO_MEMORY;
493	}
494	if (lp_posix_pathnames() \|\| (wcard[0] == '.' && wcard[1] == 0)) {
495	dptr->has_wild = True;
496	} else {
497	dptr->has_wild = wcard_has_wild;
498	}
499
500	dptr->attr = attr;
501
502	if (sconn->using_smb2) {
503	goto done;
504	}
505
506	if(old_handle) {
507
508	/*
509	* This is an old-style SMBsearch request. Ensure the
510	* value we return will fit in the range 1-255.
511	*/
512
513	dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 0);
514
515	if(dptr->dnum == -1 \|\| dptr->dnum > 254) {
516
517	/*
518	* Try and close the oldest handle not marked for
519	* expect close in the hope that the client has
520	* finished with that one.
521	*/
522
523	dptr_close_oldest(sconn, true);
524
525	/* Now try again... */
526	dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 0);
527	if(dptr->dnum == -1 \|\| dptr->dnum > 254) {
528	DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
529	SAFE_FREE(dptr->path);
530	SAFE_FREE(dptr->wcard);
531	SAFE_FREE(dptr);
532	TALLOC_FREE(dir_hnd);
533	return NT_STATUS_TOO_MANY_OPENED_FILES;
534	}
535	}
536	} else {
537
538	/*
539	* This is a new-style trans2 request. Allocate from
540	* a range that will return 256 - MAX_DIRECTORY_HANDLES.
541	*/
542
543	dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 255);
544
545	if(dptr->dnum == -1 \|\| dptr->dnum < 255) {
546
547	/*
548	* Try and close the oldest handle close in the hope that
549	* the client has finished with that one. This will only
550	* happen in the case of the Win98 client bug where it leaks
551	* directory handles.
552	*/
553
554	dptr_close_oldest(sconn, false);
555
556	/* Now try again... */
557	dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 255);
558
559	if(dptr->dnum == -1 \|\| dptr->dnum < 255) {
560	DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
561	SAFE_FREE(dptr->path);
562	SAFE_FREE(dptr->wcard);
563	SAFE_FREE(dptr);
564	TALLOC_FREE(dir_hnd);
565	return NT_STATUS_TOO_MANY_OPENED_FILES;
566	}
567	}
568	}
569
570	bitmap_set(sconn->searches.dptr_bmap, dptr->dnum);
571
572	dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */
573
574	DLIST_ADD(sconn->searches.dirptrs, dptr);
575
576	done:
577	DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
578	dptr->dnum,path,expect_close));
579
580	*dptr_ret = dptr;
581
582	return NT_STATUS_OK;
583	}
584
585
586	/****************************************************************************
587	Wrapper functions to access the lower level directory handles.
588	****************************************************************************/
589
590	void dptr_CloseDir(files_struct *fsp)
591	{
592	if (fsp->dptr) {
593	/*
594	* Ugly hack. We have defined fdopendir to return ENOSYS if dirfd also isn't
595	* present. I hate Solaris. JRA.
596	*/
597	#ifdef HAVE_DIRFD
598	if (fsp->fh->fd != -1 &&
599	fsp->dptr->dir_hnd &&
600	dirfd(fsp->dptr->dir_hnd->dir)) {
601	/* The call below closes the underlying fd. */
602	fsp->fh->fd = -1;
603	}
604	#endif
605	dptr_close_internal(fsp->dptr);
606	fsp->dptr = NULL;
607	}
608	}
609
610	void dptr_SeekDir(struct dptr_struct *dptr, long offset)
611	{
612	SeekDir(dptr->dir_hnd, offset);
613	}
614
615	long dptr_TellDir(struct dptr_struct *dptr)
616	{
617	return TellDir(dptr->dir_hnd);
618	}
619
620	bool dptr_has_wild(struct dptr_struct *dptr)
621	{
622	return dptr->has_wild;
623	}
624
625	int dptr_dnum(struct dptr_struct *dptr)
626	{
627	return dptr->dnum;
628	}
629
630	/****************************************************************************
631	Return the next visible file name, skipping veto'd and invisible files.
632	****************************************************************************/
633
634	static const char dptr_normal_ReadDirName(struct dptr_struct dptr,
635	long poffset, SMB_STRUCT_STAT pst,
636	char **ptalloced)
637	{
638	/* Normal search for the next file. */
639	const char *name;
640	char *talloced = NULL;
641
642	while ((name = ReadDirName(dptr->dir_hnd, poffset, pst, &talloced))
643	!= NULL) {
644	if (is_visible_file(dptr->conn, dptr->path, name, pst, True)) {
645	*ptalloced = talloced;
646	return name;
647	}
648	TALLOC_FREE(talloced);
649	}
650	return NULL;
651	}
652
653	/****************************************************************************
654	Return the next visible file name, skipping veto'd and invisible files.
655	****************************************************************************/
656
657	char dptr_ReadDirName(TALLOC_CTX ctx,
658	struct dptr_struct *dptr,
659	long *poffset,
660	SMB_STRUCT_STAT *pst)
661	{
662	struct smb_filename smb_fname_base;
663	char *name = NULL;
664	const char *name_temp = NULL;
665	char *talloced = NULL;
666	char *pathreal = NULL;
667	char *found_name = NULL;
668	int ret;
669
670	SET_STAT_INVALID(*pst);
671
672	if (dptr->has_wild \|\| dptr->did_stat) {
673	name_temp = dptr_normal_ReadDirName(dptr, poffset, pst,
674	&talloced);
675	if (name_temp == NULL) {
676	return NULL;
677	}
678	if (talloced != NULL) {
679	return talloc_move(ctx, &talloced);
680	}
681	return talloc_strdup(ctx, name_temp);
682	}
683
684	/* If poffset is -1 then we know we returned this name before and we
685	* have no wildcards. We're at the end of the directory. */
686	if (*poffset == END_OF_DIRECTORY_OFFSET) {
687	return NULL;
688	}
689
690	/* We know the stored wcard contains no wildcard characters.
691	* See if we can match with a stat call. If we can't, then set
692	* did_stat to true to ensure we only do this once and keep
693	* searching. */
694
695	dptr->did_stat = true;
696
697	/* First check if it should be visible. */
698	if (!is_visible_file(dptr->conn, dptr->path, dptr->wcard,
699	pst, true))
700	{
701	/* This only returns false if the file was found, but
702	is explicitly not visible. Set us to end of
703	directory, but return NULL as we know we can't ever
704	find it. */
705	goto ret;
706	}
707
708	if (VALID_STAT(*pst)) {
709	name = talloc_strdup(ctx, dptr->wcard);
710	goto ret;
711	}
712
713	pathreal = talloc_asprintf(ctx,
714	"%s/%s",
715	dptr->path,
716	dptr->wcard);
717	if (!pathreal)
718	return NULL;
719
720	/* Create an smb_filename with stream_name == NULL. */
721	ZERO_STRUCT(smb_fname_base);
722	smb_fname_base.base_name = pathreal;
723
724	if (SMB_VFS_STAT(dptr->conn, &smb_fname_base) == 0) {
725	*pst = smb_fname_base.st;
726	name = talloc_strdup(ctx, dptr->wcard);
727	goto clean;
728	} else {
729	/* If we get any other error than ENOENT or ENOTDIR
730	then the file exists we just can't stat it. */
731	if (errno != ENOENT && errno != ENOTDIR) {
732	name = talloc_strdup(ctx, dptr->wcard);
733	goto clean;
734	}
735	}
736
737	/* Stat failed. We know this is authoratiative if we are
738	* providing case sensitive semantics or the underlying
739	* filesystem is case sensitive.
740	*/
741	if (dptr->conn->case_sensitive \|\|
742	!(dptr->conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH))
743	{
744	goto clean;
745	}
746
747	/*
748	* Try case-insensitive stat if the fs has the ability. This avoids
749	* scanning the whole directory.
750	*/
751	ret = SMB_VFS_GET_REAL_FILENAME(dptr->conn, dptr->path, dptr->wcard,
752	ctx, &found_name);
753	if (ret == 0) {
754	name = found_name;
755	goto clean;
756	} else if (errno == ENOENT) {
757	/* The case-insensitive lookup was authoritative. */
758	goto clean;
759	}
760
761	TALLOC_FREE(pathreal);
762
763	name_temp = dptr_normal_ReadDirName(dptr, poffset, pst, &talloced);
764	if (name_temp == NULL) {
765	return NULL;
766	}
767	if (talloced != NULL) {
768	return talloc_move(ctx, &talloced);
769	}
770	return talloc_strdup(ctx, name_temp);
771
772	clean:
773	TALLOC_FREE(pathreal);
774	ret:
775	/* We need to set the underlying dir_hnd offset to -1
776	* also as this function is usually called with the
777	* output from TellDir. */
778	dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
779	return name;
780	}
781
782	/****************************************************************************
783	Search for a file by name, skipping veto'ed and not visible files.
784	****************************************************************************/
785
786	bool dptr_SearchDir(struct dptr_struct dptr, const char name, long poffset, SMB_STRUCT_STAT pst)
787	{
788	SET_STAT_INVALID(*pst);
789
790	if (!dptr->has_wild && (dptr->dir_hnd->offset == END_OF_DIRECTORY_OFFSET)) {
791	/* This is a singleton directory and we're already at the end. */
792	*poffset = END_OF_DIRECTORY_OFFSET;
793	return False;
794	}
795
796	return SearchDir(dptr->dir_hnd, name, poffset);
797	}
798
799	/****************************************************************************
800	Add the name we're returning into the underlying cache.
801	****************************************************************************/
802
803	void dptr_DirCacheAdd(struct dptr_struct dptr, const char name, long offset)
804	{
805	DirCacheAdd(dptr->dir_hnd, name, offset);
806	}
807
808	/****************************************************************************
809	Initialize variables & state data at the beginning of all search SMB requests.
810	****************************************************************************/
811	void dptr_init_search_op(struct dptr_struct *dptr)
812	{
813	SMB_VFS_INIT_SEARCH_OP(dptr->conn, dptr->dir_hnd->dir);
814	}
815
816	/****************************************************************************
817	Fill the 5 byte server reserved dptr field.
818	****************************************************************************/
819
820	bool dptr_fill(struct smbd_server_connection *sconn,
821	char *buf1,unsigned int key)
822	{
823	unsigned char buf = (unsigned char )buf1;
824	struct dptr_struct *dptr = dptr_get(sconn, key, false);
825	uint32 offset;
826	if (!dptr) {
827	DEBUG(1,("filling null dirptr %d\n",key));
828	return(False);
829	}
830	offset = (uint32)TellDir(dptr->dir_hnd);
831	DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
832	(long)dptr->dir_hnd,(int)offset));
833	buf[0] = key;
834	SIVAL(buf,1,offset);
835	return(True);
836	}
837
838	/****************************************************************************
839	Fetch the dir ptr and seek it given the 5 byte server field.
840	****************************************************************************/
841
842	struct dptr_struct dptr_fetch(struct smbd_server_connection sconn,
843	char buf, int num)
844	{
845	unsigned int key = (unsigned char )buf;
846	struct dptr_struct *dptr = dptr_get(sconn, key, false);
847	uint32 offset;
848	long seekoff;
849
850	if (!dptr) {
851	DEBUG(3,("fetched null dirptr %d\n",key));
852	return(NULL);
853	}
854	*num = key;
855	offset = IVAL(buf,1);
856	if (offset == (uint32)-1) {
857	seekoff = END_OF_DIRECTORY_OFFSET;
858	} else {
859	seekoff = (long)offset;
860	}
861	SeekDir(dptr->dir_hnd,seekoff);
862	DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
863	key, dptr->path, (int)seekoff));
864	return(dptr);
865	}
866
867	/****************************************************************************
868	Fetch the dir ptr.
869	****************************************************************************/
870
871	struct dptr_struct dptr_fetch_lanman2(struct smbd_server_connection sconn,
872	int dptr_num)
873	{
874	struct dptr_struct *dptr = dptr_get(sconn, dptr_num, false);
875
876	if (!dptr) {
877	DEBUG(3,("fetched null dirptr %d\n",dptr_num));
878	return(NULL);
879	}
880	DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr->path));
881	return(dptr);
882	}
883
884	/****************************************************************************
885	Check that a file matches a particular file type.
886	****************************************************************************/
887
888	bool dir_check_ftype(connection_struct *conn, uint32 mode, uint32 dirtype)
889	{
890	uint32 mask;
891
892	/* Check the "may have" search bits. */
893	if (((mode & ~dirtype) & (FILE_ATTRIBUTE_HIDDEN \| FILE_ATTRIBUTE_SYSTEM \| FILE_ATTRIBUTE_DIRECTORY)) != 0)
894	return False;
895
896	/* Check the "must have" bits, which are the may have bits shifted eight */
897	/* If must have bit is set, the file/dir can not be returned in search unless the matching
898	file attribute is set */
899	mask = ((dirtype >> 8) & (FILE_ATTRIBUTE_DIRECTORY\|FILE_ATTRIBUTE_ARCHIVE\|FILE_ATTRIBUTE_READONLY\|FILE_ATTRIBUTE_HIDDEN\|FILE_ATTRIBUTE_SYSTEM)); /* & 0x37 */
900	if(mask) {
901	if((mask & (mode & (FILE_ATTRIBUTE_DIRECTORY\|FILE_ATTRIBUTE_ARCHIVE\|FILE_ATTRIBUTE_READONLY\|FILE_ATTRIBUTE_HIDDEN\|FILE_ATTRIBUTE_SYSTEM))) == mask) /* check if matching attribute present */
902	return True;
903	else
904	return False;
905	}
906
907	return True;
908	}
909
910	static bool mangle_mask_match(connection_struct *conn,
911	const char *filename,
912	const char *mask)
913	{
914	char mname[13];
915
916	if (!name_to_8_3(filename,mname,False,conn->params)) {
917	return False;
918	}
919	return mask_match_search(mname,mask,False);
920	}
921
922	bool smbd_dirptr_get_entry(TALLOC_CTX *ctx,
923	struct dptr_struct *dirptr,
924	const char *mask,
925	uint32_t dirtype,
926	bool dont_descend,
927	bool ask_sharemode,
928	bool (match_fn)(TALLOC_CTX ctx,
929	void *private_data,
930	const char *dname,
931	const char *mask,
932	char **_fname),
933	bool (mode_fn)(TALLOC_CTX ctx,
934	void *private_data,
935	struct smb_filename *smb_fname,
936	uint32_t *_mode),
937	void *private_data,
938	char **_fname,
939	struct smb_filename **_smb_fname,
940	uint32_t *_mode,
941	long *_prev_offset)
942	{
943	connection_struct *conn = dirptr->conn;
944	bool needslash;
945
946	*_smb_fname = NULL;
947	*_mode = 0;
948
949	needslash = ( dirptr->path[strlen(dirptr->path) -1] != '/');
950
951	while (true) {
952	long cur_offset;
953	long prev_offset;
954	SMB_STRUCT_STAT sbuf;
955	char *dname = NULL;
956	bool isdots;
957	char *fname = NULL;
958	char *pathreal = NULL;
959	struct smb_filename smb_fname;
960	uint32_t mode = 0;
961	bool ok;
962	NTSTATUS status;
963
964	cur_offset = dptr_TellDir(dirptr);
965	prev_offset = cur_offset;
966	dname = dptr_ReadDirName(ctx, dirptr, &cur_offset, &sbuf);
967
968	DEBUG(6,("smbd_dirptr_get_entry: dirptr 0x%lx now at offset %ld\n",
969	(long)dirptr, cur_offset));
970
971	if (dname == NULL) {
972	return false;
973	}
974
975	isdots = (ISDOT(dname) \|\| ISDOTDOT(dname));
976	if (dont_descend && !isdots) {
977	TALLOC_FREE(dname);
978	continue;
979	}
980
981	/*
982	* fname may get mangled, dname is never mangled.
983	* Whenever we're accessing the filesystem we use
984	* pathreal which is composed from dname.
985	*/
986
987	ok = match_fn(ctx, private_data, dname, mask, &fname);
988	if (!ok) {
989	TALLOC_FREE(dname);
990	continue;
991	}
992
993	pathreal = talloc_asprintf(ctx, "%s%s%s",
994	dirptr->path,
995	needslash?"/":"",
996	dname);
997	if (!pathreal) {
998	TALLOC_FREE(dname);
999	TALLOC_FREE(fname);
1000	return false;
1001	}
1002
1003	/* Create smb_fname with NULL stream_name. */
1004	ZERO_STRUCT(smb_fname);
1005	smb_fname.base_name = pathreal;
1006	smb_fname.st = sbuf;
1007
1008	ok = mode_fn(ctx, private_data, &smb_fname, &mode);
1009	if (!ok) {
1010	TALLOC_FREE(dname);
1011	TALLOC_FREE(fname);
1012	TALLOC_FREE(pathreal);
1013	continue;
1014	}
1015
1016	if (!dir_check_ftype(conn, mode, dirtype)) {
1017	DEBUG(5,("[%s] attribs 0x%x didn't match 0x%x\n",
1018	fname, (unsigned int)mode, (unsigned int)dirtype));
1019	TALLOC_FREE(dname);
1020	TALLOC_FREE(fname);
1021	TALLOC_FREE(pathreal);
1022	continue;
1023	}
1024
1025	if (ask_sharemode) {
1026	struct timespec write_time_ts;
1027	struct file_id fileid;
1028
1029	fileid = vfs_file_id_from_sbuf(conn,
1030	&smb_fname.st);
1031	get_file_infos(fileid, 0, NULL, &write_time_ts);
1032	if (!null_timespec(write_time_ts)) {
1033	update_stat_ex_mtime(&smb_fname.st,
1034	write_time_ts);
1035	}
1036	}
1037
1038	DEBUG(3,("smbd_dirptr_get_entry mask=[%s] found %s "
1039	"fname=%s (%s)\n",
1040	mask, smb_fname_str_dbg(&smb_fname),
1041	dname, fname));
1042
1043	DirCacheAdd(dirptr->dir_hnd, dname, cur_offset);
1044
1045	TALLOC_FREE(dname);
1046
1047	status = copy_smb_filename(ctx, &smb_fname, _smb_fname);
1048	TALLOC_FREE(pathreal);
1049	if (!NT_STATUS_IS_OK(status)) {
1050	return false;
1051	}
1052	*_fname = fname;
1053	*_mode = mode;
1054	*_prev_offset = prev_offset;
1055
1056	return true;
1057	}
1058
1059	return false;
1060	}
1061
1062	/****************************************************************************
1063	Get an 8.3 directory entry.
1064	****************************************************************************/
1065
1066	static bool smbd_dirptr_8_3_match_fn(TALLOC_CTX *ctx,
1067	void *private_data,
1068	const char *dname,
1069	const char *mask,
1070	char **_fname)
1071	{
1072	connection_struct conn = (connection_struct )private_data;
1073
1074	if ((strcmp(mask,".") == 0) \|\|
1075	mask_match_search(dname, mask, false) \|\|
1076	mangle_mask_match(conn, dname, mask)) {
1077	char mname[13];
1078	const char *fname;
1079
1080	if (!mangle_is_8_3(dname, false, conn->params)) {
1081	bool ok = name_to_8_3(dname, mname, false,
1082	conn->params);
1083	if (!ok) {
1084	return false;
1085	}
1086	fname = mname;
1087	} else {
1088	fname = dname;
1089	}
1090
1091	*_fname = talloc_strdup(ctx, fname);
1092	if (*_fname == NULL) {
1093	return false;
1094	}
1095
1096	return true;
1097	}
1098
1099	return false;
1100	}
1101
1102	static bool smbd_dirptr_8_3_mode_fn(TALLOC_CTX *ctx,
1103	void *private_data,
1104	struct smb_filename *smb_fname,
1105	uint32_t *_mode)
1106	{
1107	connection_struct conn = (connection_struct )private_data;
1108
1109	if (!VALID_STAT(smb_fname->st)) {
1110	if ((SMB_VFS_STAT(conn, smb_fname)) != 0) {
1111	DEBUG(5,("smbd_dirptr_8_3_mode_fn: "
1112	"Couldn't stat [%s]. Error "
1113	"= %s\n",
1114	smb_fname_str_dbg(smb_fname),
1115	strerror(errno)));
1116	return false;
1117	}
1118	}
1119
1120	*_mode = dos_mode(conn, smb_fname);
1121	return true;
1122	}
1123
1124	bool get_dir_entry(TALLOC_CTX *ctx,
1125	struct dptr_struct *dirptr,
1126	const char *mask,
1127	uint32_t dirtype,
1128	char **_fname,
1129	SMB_OFF_T *_size,
1130	uint32_t *_mode,
1131	struct timespec *_date,
1132	bool check_descend,
1133	bool ask_sharemode)
1134	{
1135	connection_struct *conn = dirptr->conn;
1136	char *fname = NULL;
1137	struct smb_filename *smb_fname = NULL;
1138	uint32_t mode = 0;
1139	long prev_offset;
1140	bool ok;
1141
1142	ok = smbd_dirptr_get_entry(ctx,
1143	dirptr,
1144	mask,
1145	dirtype,
1146	check_descend,
1147	ask_sharemode,
1148	smbd_dirptr_8_3_match_fn,
1149	smbd_dirptr_8_3_mode_fn,
1150	conn,
1151	&fname,
1152	&smb_fname,
1153	&mode,
1154	&prev_offset);
1155	if (!ok) {
1156	return false;
1157	}
1158
1159	*_fname = talloc_move(ctx, &fname);
1160	*_size = smb_fname->st.st_ex_size;
1161	*_mode = mode;
1162	*_date = smb_fname->st.st_ex_mtime;
1163	TALLOC_FREE(smb_fname);
1164	return true;
1165	}
1166
1167	/*******************************************************************
1168	Check to see if a user can read a file. This is only approximate,
1169	it is used as part of the "hide unreadable" option. Don't
1170	use it for anything security sensitive.
1171	********************************************************************/
1172
1173	static bool user_can_read_file(connection_struct *conn,
1174	struct smb_filename *smb_fname)
1175	{
1176	/*
1177	* Never hide files from the root user.
1178	* We use (uid_t)0 here not sec_initial_uid()
1179	* as make test uses a single user context.
1180	*/
1181
1182	if (get_current_uid(conn) == (uid_t)0) {
1183	return True;
1184	}
1185
1186	return can_access_file_acl(conn, smb_fname, FILE_READ_DATA);
1187	}
1188
1189	/*******************************************************************
1190	Check to see if a user can write a file (and only files, we do not
1191	check dirs on this one). This is only approximate,
1192	it is used as part of the "hide unwriteable" option. Don't
1193	use it for anything security sensitive.
1194	********************************************************************/
1195
1196	static bool user_can_write_file(connection_struct *conn,
1197	const struct smb_filename *smb_fname)
1198	{
1199	/*
1200	* Never hide files from the root user.
1201	* We use (uid_t)0 here not sec_initial_uid()
1202	* as make test uses a single user context.
1203	*/
1204
1205	if (get_current_uid(conn) == (uid_t)0) {
1206	return True;
1207	}
1208
1209	SMB_ASSERT(VALID_STAT(smb_fname->st));
1210
1211	/* Pseudo-open the file */
1212
1213	if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1214	return True;
1215	}
1216
1217	return can_write_to_file(conn, smb_fname);
1218	}
1219
1220	/*******************************************************************
1221	Is a file a "special" type ?
1222	********************************************************************/
1223
1224	static bool file_is_special(connection_struct *conn,
1225	const struct smb_filename *smb_fname)
1226	{
1227	/*
1228	* Never hide files from the root user.
1229	* We use (uid_t)0 here not sec_initial_uid()
1230	* as make test uses a single user context.
1231	*/
1232
1233	if (get_current_uid(conn) == (uid_t)0) {
1234	return False;
1235	}
1236
1237	SMB_ASSERT(VALID_STAT(smb_fname->st));
1238
1239	if (S_ISREG(smb_fname->st.st_ex_mode) \|\|
1240	S_ISDIR(smb_fname->st.st_ex_mode) \|\|
1241	S_ISLNK(smb_fname->st.st_ex_mode))
1242	return False;
1243
1244	return True;
1245	}
1246
1247	/*******************************************************************
1248	Should the file be seen by the client?
1249	NOTE: A successful return is no guarantee of the file's existence.
1250	********************************************************************/
1251
1252	bool is_visible_file(connection_struct conn, const char dir_path,
1253	const char name, SMB_STRUCT_STAT pst, bool use_veto)
1254	{
1255	bool hide_unreadable = lp_hideunreadable(SNUM(conn));
1256	bool hide_unwriteable = lp_hideunwriteable_files(SNUM(conn));
1257	bool hide_special = lp_hide_special_files(SNUM(conn));
1258	char *entry = NULL;
1259	struct smb_filename *smb_fname_base = NULL;
1260	NTSTATUS status;
1261	bool ret = false;
1262
1263	if ((strcmp(".",name) == 0) \|\| (strcmp("..",name) == 0)) {
1264	return True; /* . and .. are always visible. */
1265	}
1266
1267	/* If it's a vetoed file, pretend it doesn't even exist */
1268	if (use_veto && IS_VETO_PATH(conn, name)) {
1269	DEBUG(10,("is_visible_file: file %s is vetoed.\n", name ));
1270	return False;
1271	}
1272
1273	if (hide_unreadable \|\| hide_unwriteable \|\| hide_special) {
1274	entry = talloc_asprintf(talloc_tos(), "%s/%s", dir_path, name);
1275	if (!entry) {
1276	ret = false;
1277	goto out;
1278	}
1279
1280	/* Create an smb_filename with stream_name == NULL. */
1281	status = create_synthetic_smb_fname(talloc_tos(), entry, NULL,
1282	pst, &smb_fname_base);
1283	if (!NT_STATUS_IS_OK(status)) {
1284	ret = false;
1285	goto out;
1286	}
1287
1288	/* If the file name does not exist, there's no point checking
1289	* the configuration options. We succeed, on the basis that the
1290	* checks might have passed if the file was present.
1291	*/
1292	if (!VALID_STAT(*pst)) {
1293	if (SMB_VFS_STAT(conn, smb_fname_base) != 0) {
1294	ret = true;
1295	goto out;
1296	} else {
1297	*pst = smb_fname_base->st;
1298	}
1299	}
1300
1301	/* Honour _hide unreadable_ option */
1302	if (hide_unreadable &&
1303	!user_can_read_file(conn, smb_fname_base)) {
1304	DEBUG(10,("is_visible_file: file %s is unreadable.\n",
1305	entry ));
1306	ret = false;
1307	goto out;
1308	}
1309	/* Honour _hide unwriteable_ option */
1310	if (hide_unwriteable && !user_can_write_file(conn,
1311	smb_fname_base)) {
1312	DEBUG(10,("is_visible_file: file %s is unwritable.\n",
1313	entry ));
1314	ret = false;
1315	goto out;
1316	}
1317	/* Honour _hide_special_ option */
1318	if (hide_special && file_is_special(conn, smb_fname_base)) {
1319	DEBUG(10,("is_visible_file: file %s is special.\n",
1320	entry ));
1321	ret = false;
1322	goto out;
1323	}
1324	}
1325
1326	ret = true;
1327	out:
1328	TALLOC_FREE(smb_fname_base);
1329	TALLOC_FREE(entry);
1330	return ret;
1331	}
1332
1333	static int smb_Dir_destructor(struct smb_Dir *dirp)
1334	{
1335	if (dirp->dir) {
1336	#ifdef HAVE_DIRFD
1337	if (dirp->conn->sconn) {
1338	files_struct *fsp = file_find_fd(dirp->conn->sconn,
1339	dirfd(dirp->dir));
1340	if (fsp) {
1341	/* The call below closes the underlying fd. */
1342	fsp->fh->fd = -1;
1343	}
1344	}
1345	#endif
1346	SMB_VFS_CLOSEDIR(dirp->conn,dirp->dir);
1347	}
1348	if (dirp->conn->sconn && !dirp->conn->sconn->using_smb2) {
1349	dirp->conn->sconn->searches.dirhandles_open--;
1350	}
1351	return 0;
1352	}
1353
1354	/*******************************************************************
1355	Open a directory.
1356	********************************************************************/
1357
1358	struct smb_Dir OpenDir(TALLOC_CTX mem_ctx, connection_struct *conn,
1359	const char *name,
1360	const char *mask,
1361	uint32 attr)
1362	{
1363	struct smb_Dir *dirp = TALLOC_ZERO_P(mem_ctx, struct smb_Dir);
1364	struct smbd_server_connection *sconn = conn->sconn;
1365
1366	if (!dirp) {
1367	return NULL;
1368	}
1369
1370	dirp->conn = conn;
1371	dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1372
1373	dirp->dir_path = talloc_strdup(dirp, name);
1374	if (!dirp->dir_path) {
1375	errno = ENOMEM;
1376	goto fail;
1377	}
1378
1379	if (sconn && !sconn->using_smb2) {
1380	sconn->searches.dirhandles_open++;
1381	}
1382	talloc_set_destructor(dirp, smb_Dir_destructor);
1383
1384	dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1385	if (!dirp->dir) {
1386	DEBUG(5,("OpenDir: Can't open %s. %s\n", dirp->dir_path,
1387	strerror(errno) ));
1388	goto fail;
1389	}
1390
1391	return dirp;
1392
1393	fail:
1394	TALLOC_FREE(dirp);
1395	return NULL;
1396	}
1397
1398	/*******************************************************************
1399	Open a directory from an fsp.
1400	********************************************************************/
1401
1402	static struct smb_Dir OpenDir_fsp(TALLOC_CTX mem_ctx, connection_struct *conn,
1403	files_struct *fsp,
1404	const char *mask,
1405	uint32 attr)
1406	{
1407	struct smb_Dir *dirp = TALLOC_ZERO_P(mem_ctx, struct smb_Dir);
1408	struct smbd_server_connection *sconn = conn->sconn;
1409
1410	if (!dirp) {
1411	return NULL;
1412	}
1413
1414	dirp->conn = conn;
1415	dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1416
1417	dirp->dir_path = talloc_strdup(dirp, fsp->fsp_name->base_name);
1418	if (!dirp->dir_path) {
1419	errno = ENOMEM;
1420	goto fail;
1421	}
1422
1423	if (sconn && !sconn->using_smb2) {
1424	sconn->searches.dirhandles_open++;
1425	}
1426	talloc_set_destructor(dirp, smb_Dir_destructor);
1427
1428	if (fsp->is_directory && fsp->fh->fd != -1) {
1429	dirp->dir = SMB_VFS_FDOPENDIR(fsp, mask, attr);
1430	if (dirp->dir == NULL) {
1431	DEBUG(10,("OpenDir_fsp: SMB_VFS_FDOPENDIR on %s returned "
1432	"NULL (%s)\n",
1433	dirp->dir_path,
1434	strerror(errno)));
1435	if (errno != ENOSYS) {
1436	return NULL;
1437	}
1438	}
1439	}
1440
1441	if (dirp->dir == NULL) {
1442	/* FDOPENDIR didn't work. Use OPENDIR instead. */
1443	dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1444	}
1445
1446	if (!dirp->dir) {
1447	DEBUG(5,("OpenDir_fsp: Can't open %s. %s\n", dirp->dir_path,
1448	strerror(errno) ));
1449	goto fail;
1450	}
1451
1452	return dirp;
1453
1454	fail:
1455	TALLOC_FREE(dirp);
1456	return NULL;
1457	}
1458
1459
1460	/*******************************************************************
1461	Read from a directory.
1462	Return directory entry, current offset, and optional stat information.
1463	Don't check for veto or invisible files.
1464	********************************************************************/
1465
1466	const char ReadDirName(struct smb_Dir dirp, long *poffset,
1467	SMB_STRUCT_STAT sbuf, char *ptalloced)
1468	{
1469	const char *n;
1470	char *talloced = NULL;
1471	connection_struct *conn = dirp->conn;
1472
1473	/* Cheat to allow . and .. to be the first entries returned. */
1474	if (((*poffset == START_OF_DIRECTORY_OFFSET) \|\|
1475	(*poffset == DOT_DOT_DIRECTORY_OFFSET)) && (dirp->file_number < 2))
1476	{
1477	if (dirp->file_number == 0) {
1478	n = ".";
1479	*poffset = dirp->offset = START_OF_DIRECTORY_OFFSET;
1480	} else {
1481	n = "..";
1482	*poffset = dirp->offset = DOT_DOT_DIRECTORY_OFFSET;
1483	}
1484	dirp->file_number++;
1485	*ptalloced = NULL;
1486	return n;
1487	} else if (*poffset == END_OF_DIRECTORY_OFFSET) {
1488	*poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1489	return NULL;
1490	} else {
1491	/* A real offset, seek to it. */
1492	SeekDir(dirp, *poffset);
1493	}
1494
1495	while ((n = vfs_readdirname(conn, dirp->dir, sbuf, &talloced))) {
1496	/* Ignore . and .. - we've already returned them. */
1497	if (*n == '.') {
1498	if ((n[1] == '\0') \|\| (n[1] == '.' && n[2] == '\0')) {
1499	TALLOC_FREE(talloced);
1500	continue;
1501	}
1502	}
1503	*poffset = dirp->offset = SMB_VFS_TELLDIR(conn, dirp->dir);
1504	*ptalloced = talloced;
1505	dirp->file_number++;
1506	return n;
1507	}
1508	*poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1509	*ptalloced = NULL;
1510	return NULL;
1511	}
1512
1513	/*******************************************************************
1514	Rewind to the start.
1515	********************************************************************/
1516
1517	void RewindDir(struct smb_Dir dirp, long poffset)
1518	{
1519	SMB_VFS_REWINDDIR(dirp->conn, dirp->dir);
1520	dirp->file_number = 0;
1521	dirp->offset = START_OF_DIRECTORY_OFFSET;
1522	*poffset = START_OF_DIRECTORY_OFFSET;
1523	}
1524
1525	/*******************************************************************
1526	Seek a dir.
1527	********************************************************************/
1528
1529	void SeekDir(struct smb_Dir *dirp, long offset)
1530	{
1531	if (offset != dirp->offset) {
1532	if (offset == START_OF_DIRECTORY_OFFSET) {
1533	RewindDir(dirp, &offset);
1534	/*
1535	* Ok we should really set the file number here
1536	* to 1 to enable ".." to be returned next. Trouble
1537	* is I'm worried about callers using SeekDir(dirp,0)
1538	* as equivalent to RewindDir(). So leave this alone
1539	* for now.
1540	*/
1541	} else if (offset == DOT_DOT_DIRECTORY_OFFSET) {
1542	RewindDir(dirp, &offset);
1543	/*
1544	* Set the file number to 2 - we want to get the first
1545	* real file entry (the one we return after "..")
1546	* on the next ReadDir.
1547	*/
1548	dirp->file_number = 2;
1549	} else if (offset == END_OF_DIRECTORY_OFFSET) {
1550	; /* Don't seek in this case. */
1551	} else {
1552	SMB_VFS_SEEKDIR(dirp->conn, dirp->dir, offset);
1553	}
1554	dirp->offset = offset;
1555	}
1556	}
1557
1558	/*******************************************************************
1559	Tell a dir position.
1560	********************************************************************/
1561
1562	long TellDir(struct smb_Dir *dirp)
1563	{
1564	return(dirp->offset);
1565	}
1566
1567	/*******************************************************************
1568	Add an entry into the dcache.
1569	********************************************************************/
1570
1571	void DirCacheAdd(struct smb_Dir dirp, const char name, long offset)
1572	{
1573	struct name_cache_entry *e;
1574
1575	if (dirp->name_cache_size == 0) {
1576	return;
1577	}
1578
1579	if (dirp->name_cache == NULL) {
1580	dirp->name_cache = TALLOC_ZERO_ARRAY(
1581	dirp, struct name_cache_entry, dirp->name_cache_size);
1582
1583	if (dirp->name_cache == NULL) {
1584	return;
1585	}
1586	}
1587
1588	dirp->name_cache_index = (dirp->name_cache_index+1) %
1589	dirp->name_cache_size;
1590	e = &dirp->name_cache[dirp->name_cache_index];
1591	TALLOC_FREE(e->name);
1592	e->name = talloc_strdup(dirp, name);
1593	e->offset = offset;
1594	}
1595
1596	/*******************************************************************
1597	Find an entry by name. Leave us at the offset after it.
1598	Don't check for veto or invisible files.
1599	********************************************************************/
1600
1601	bool SearchDir(struct smb_Dir dirp, const char name, long *poffset)
1602	{
1603	int i;
1604	const char *entry = NULL;
1605	char *talloced = NULL;
1606	connection_struct *conn = dirp->conn;
1607
1608	/* Search back in the name cache. */
1609	if (dirp->name_cache_size && dirp->name_cache) {
1610	for (i = dirp->name_cache_index; i >= 0; i--) {
1611	struct name_cache_entry *e = &dirp->name_cache[i];
1612	if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1613	*poffset = e->offset;
1614	SeekDir(dirp, e->offset);
1615	return True;
1616	}
1617	}
1618	for (i = dirp->name_cache_size - 1; i > dirp->name_cache_index; i--) {
1619	struct name_cache_entry *e = &dirp->name_cache[i];
1620	if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1621	*poffset = e->offset;
1622	SeekDir(dirp, e->offset);
1623	return True;
1624	}
1625	}
1626	}
1627
1628	/* Not found in the name cache. Rewind directory and start from scratch. */
1629	SMB_VFS_REWINDDIR(conn, dirp->dir);
1630	dirp->file_number = 0;
1631	*poffset = START_OF_DIRECTORY_OFFSET;
1632	while ((entry = ReadDirName(dirp, poffset, NULL, &talloced))) {
1633	if (conn->case_sensitive ? (strcmp(entry, name) == 0) : strequal(entry, name)) {
1634	TALLOC_FREE(talloced);
1635	return True;
1636	}
1637	TALLOC_FREE(talloced);
1638	}
1639	return False;
1640	}
1641
1642	/*****************************************************************
1643	Is this directory empty ?
1644	*****************************************************************/
1645
1646	NTSTATUS can_delete_directory(struct connection_struct *conn,
1647	const char *dirname)
1648	{
1649	NTSTATUS status = NT_STATUS_OK;
1650	long dirpos = 0;
1651	const char *dname = NULL;
1652	char *talloced = NULL;
1653	SMB_STRUCT_STAT st;
1654	struct smb_Dir *dir_hnd = OpenDir(talloc_tos(), conn,
1655	dirname, NULL, 0);
1656
1657	if (!dir_hnd) {
1658	return map_nt_error_from_unix(errno);
1659	}
1660
1661	while ((dname = ReadDirName(dir_hnd, &dirpos, &st, &talloced))) {
1662	/* Quick check for "." and ".." */
1663	if (dname[0] == '.') {
1664	if (!dname[1] \|\| (dname[1] == '.' && !dname[2])) {
1665	TALLOC_FREE(talloced);
1666	continue;
1667	}
1668	}
1669
1670	if (!is_visible_file(conn, dirname, dname, &st, True)) {
1671	TALLOC_FREE(talloced);
1672	continue;
1673	}
1674
1675	DEBUG(10,("can_delete_directory: got name %s - can't delete\n",
1676	dname ));
1677	status = NT_STATUS_DIRECTORY_NOT_EMPTY;
1678	break;
1679	}
1680	TALLOC_FREE(talloced);
1681	TALLOC_FREE(dir_hnd);
1682
1683	return status;
1684	}

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