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VERSION: Disable git snapshots for the 4.1.4 release.
[Samba.git] / source3 / smbd / dir.c
blob8fa320b197b0a5318274f21833f655b9d063efff
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 #include "lib/util/bitmap.h"
27
28 /*
29 This module implements directory related functions for Samba.
30 */
31
32 /* "Special" directory offsets. */
33 #define END_OF_DIRECTORY_OFFSET ((long)-1)
34 #define START_OF_DIRECTORY_OFFSET ((long)0)
35 #define DOT_DOT_DIRECTORY_OFFSET ((long)0x80000000)
36
37 /* Make directory handle internals available. */
38
39 struct name_cache_entry {
40 char *name;
41 long offset;
42 };
43
44 struct smb_Dir {
45 connection_struct *conn;
46 DIR *dir;
47 long offset;
48 char *dir_path;
49 size_t name_cache_size;
50 struct name_cache_entry *name_cache;
51 unsigned int name_cache_index;
52 unsigned int file_number;
53 files_struct *fsp; /* Back pointer to containing fsp, only
54 set from OpenDir_fsp(). */
55 };
56
57 struct dptr_struct {
58 struct dptr_struct *next, *prev;
59 int dnum;
60 uint16 spid;
61 struct connection_struct *conn;
62 struct smb_Dir *dir_hnd;
63 bool expect_close;
64 char *wcard;
65 uint32 attr;
66 char *path;
67 bool has_wild; /* Set to true if the wcard entry has MS wildcard characters in it. */
68 bool did_stat; /* Optimisation for non-wcard searches. */
69 bool priv; /* Directory handle opened with privilege. */
70 };
71
72 static struct smb_Dir *OpenDir_fsp(TALLOC_CTX *mem_ctx, connection_struct *conn,
73 files_struct *fsp,
74 const char *mask,
75 uint32 attr);
76
77 static void DirCacheAdd(struct smb_Dir *dirp, const char *name, long offset);
78
79 #define INVALID_DPTR_KEY (-3)
80
81 /****************************************************************************
82 Make a dir struct.
83 ****************************************************************************/
84
85 bool make_dir_struct(TALLOC_CTX *ctx,
86 char *buf,
87 const char *mask,
88 const char *fname,
89 off_t size,
90 uint32 mode,
91 time_t date,
92 bool uc)
93 {
94 char *p;
95 char *mask2 = talloc_strdup(ctx, mask);
96
97 if (!mask2) {
98 return False;
99 }
100
101 if ((mode & FILE_ATTRIBUTE_DIRECTORY) != 0) {
102 size = 0;
103 }
104
105 memset(buf+1,' ',11);
106 if ((p = strchr_m(mask2,'.')) != NULL) {
107 *p = 0;
108 push_ascii(buf+1,mask2,8, 0);
109 push_ascii(buf+9,p+1,3, 0);
110 *p = '.';
111 } else {
112 push_ascii(buf+1,mask2,11, 0);
113 }
114
115 memset(buf+21,'\0',DIR_STRUCT_SIZE-21);
116 SCVAL(buf,21,mode);
117 srv_put_dos_date(buf,22,date);
118 SSVAL(buf,26,size & 0xFFFF);
119 SSVAL(buf,28,(size >> 16)&0xFFFF);
120 /* We only uppercase if FLAGS2_LONG_PATH_COMPONENTS is zero in the input buf.
121 Strange, but verified on W2K3. Needed for OS/2. JRA. */
122 push_ascii(buf+30,fname,12, uc ? STR_UPPER : 0);
123 DEBUG(8,("put name [%s] from [%s] into dir struct\n",buf+30, fname));
124 return True;
125 }
126
127 /****************************************************************************
128 Initialise the dir bitmap.
129 ****************************************************************************/
130
131 bool init_dptrs(struct smbd_server_connection *sconn)
132 {
133 if (sconn->searches.dptr_bmap) {
134 return true;
135 }
136
137 sconn->searches.dptr_bmap = bitmap_talloc(
138 sconn, MAX_DIRECTORY_HANDLES);
139
140 if (sconn->searches.dptr_bmap == NULL) {
141 return false;
142 }
143
144 return true;
145 }
146
147 /****************************************************************************
148 Idle a dptr - the directory is closed but the control info is kept.
149 ****************************************************************************/
150
151 static void dptr_idle(struct dptr_struct *dptr)
152 {
153 if (dptr->dir_hnd) {
154 DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
155 TALLOC_FREE(dptr->dir_hnd);
156 }
157 }
158
159 /****************************************************************************
160 Idle the oldest dptr.
161 ****************************************************************************/
162
163 static void dptr_idleoldest(struct smbd_server_connection *sconn)
164 {
165 struct dptr_struct *dptr;
166
167 /*
168 * Go to the end of the list.
169 */
170 dptr = DLIST_TAIL(sconn->searches.dirptrs);
171
172 if(!dptr) {
173 DEBUG(0,("No dptrs available to idle ?\n"));
174 return;
175 }
176
177 /*
178 * Idle the oldest pointer.
179 */
180
181 for(; dptr; dptr = DLIST_PREV(dptr)) {
182 if (dptr->dir_hnd) {
183 dptr_idle(dptr);
184 return;
185 }
186 }
187 }
188
189 /****************************************************************************
190 Get the struct dptr_struct for a dir index.
191 ****************************************************************************/
192
193 static struct dptr_struct *dptr_get(struct smbd_server_connection *sconn,
194 int key, bool forclose)
195 {
196 struct dptr_struct *dptr;
197
198 for(dptr = sconn->searches.dirptrs; dptr; dptr = dptr->next) {
199 if(dptr->dnum == key) {
200 if (!forclose && !dptr->dir_hnd) {
201 if (sconn->searches.dirhandles_open >= MAX_OPEN_DIRECTORIES)
202 dptr_idleoldest(sconn);
203 DEBUG(4,("dptr_get: Reopening dptr key %d\n",key));
204 if (!(dptr->dir_hnd = OpenDir(
205 NULL, dptr->conn, dptr->path,
206 dptr->wcard, dptr->attr))) {
207 DEBUG(4,("dptr_get: Failed to open %s (%s)\n",dptr->path,
208 strerror(errno)));
209 return NULL;
210 }
211 }
212 DLIST_PROMOTE(sconn->searches.dirptrs,dptr);
213 return dptr;
214 }
215 }
216 return(NULL);
217 }
218
219 /****************************************************************************
220 Get the dir path for a dir index.
221 ****************************************************************************/
222
223 const char *dptr_path(struct smbd_server_connection *sconn, int key)
224 {
225 struct dptr_struct *dptr = dptr_get(sconn, key, false);
226 if (dptr)
227 return(dptr->path);
228 return(NULL);
229 }
230
231 /****************************************************************************
232 Get the dir wcard for a dir index.
233 ****************************************************************************/
234
235 const char *dptr_wcard(struct smbd_server_connection *sconn, int key)
236 {
237 struct dptr_struct *dptr = dptr_get(sconn, key, false);
238 if (dptr)
239 return(dptr->wcard);
240 return(NULL);
241 }
242
243 /****************************************************************************
244 Get the dir attrib for a dir index.
245 ****************************************************************************/
246
247 uint16 dptr_attr(struct smbd_server_connection *sconn, int key)
248 {
249 struct dptr_struct *dptr = dptr_get(sconn, key, false);
250 if (dptr)
251 return(dptr->attr);
252 return(0);
253 }
254
255 /****************************************************************************
256 Close a dptr (internal func).
257 ****************************************************************************/
258
259 static void dptr_close_internal(struct dptr_struct *dptr)
260 {
261 struct smbd_server_connection *sconn = dptr->conn->sconn;
262
263 DEBUG(4,("closing dptr key %d\n",dptr->dnum));
264
265 if (sconn == NULL) {
266 goto done;
267 }
268
269 if (sconn->using_smb2) {
270 goto done;
271 }
272
273 DLIST_REMOVE(sconn->searches.dirptrs, dptr);
274
275 /*
276 * Free the dnum in the bitmap. Remember the dnum value is always
277 * biased by one with respect to the bitmap.
278 */
279
280 if (!bitmap_query(sconn->searches.dptr_bmap, dptr->dnum - 1)) {
281 DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
282 dptr->dnum ));
283 }
284
285 bitmap_clear(sconn->searches.dptr_bmap, dptr->dnum - 1);
286
287 done:
288 TALLOC_FREE(dptr->dir_hnd);
289 TALLOC_FREE(dptr);
290 }
291
292 /****************************************************************************
293 Close a dptr given a key.
294 ****************************************************************************/
295
296 void dptr_close(struct smbd_server_connection *sconn, int *key)
297 {
298 struct dptr_struct *dptr;
299
300 if(*key == INVALID_DPTR_KEY)
301 return;
302
303 /* OS/2 seems to use -1 to indicate "close all directories" */
304 if (*key == -1) {
305 struct dptr_struct *next;
306 for(dptr = sconn->searches.dirptrs; dptr; dptr = next) {
307 next = dptr->next;
308 dptr_close_internal(dptr);
309 }
310 *key = INVALID_DPTR_KEY;
311 return;
312 }
313
314 dptr = dptr_get(sconn, *key, true);
315
316 if (!dptr) {
317 DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
318 return;
319 }
320
321 dptr_close_internal(dptr);
322
323 *key = INVALID_DPTR_KEY;
324 }
325
326 /****************************************************************************
327 Close all dptrs for a cnum.
328 ****************************************************************************/
329
330 void dptr_closecnum(connection_struct *conn)
331 {
332 struct dptr_struct *dptr, *next;
333 struct smbd_server_connection *sconn = conn->sconn;
334
335 if (sconn == NULL) {
336 return;
337 }
338
339 for(dptr = sconn->searches.dirptrs; dptr; dptr = next) {
340 next = dptr->next;
341 if (dptr->conn == conn) {
342 dptr_close_internal(dptr);
343 }
344 }
345 }
346
347 /****************************************************************************
348 Idle all dptrs for a cnum.
349 ****************************************************************************/
350
351 void dptr_idlecnum(connection_struct *conn)
352 {
353 struct dptr_struct *dptr;
354 struct smbd_server_connection *sconn = conn->sconn;
355
356 if (sconn == NULL) {
357 return;
358 }
359
360 for(dptr = sconn->searches.dirptrs; dptr; dptr = dptr->next) {
361 if (dptr->conn == conn && dptr->dir_hnd) {
362 dptr_idle(dptr);
363 }
364 }
365 }
366
367 /****************************************************************************
368 Close a dptr that matches a given path, only if it matches the spid also.
369 ****************************************************************************/
370
371 void dptr_closepath(struct smbd_server_connection *sconn,
372 char *path,uint16 spid)
373 {
374 struct dptr_struct *dptr, *next;
375 for(dptr = sconn->searches.dirptrs; dptr; dptr = next) {
376 next = dptr->next;
377 if (spid == dptr->spid && strequal(dptr->path,path))
378 dptr_close_internal(dptr);
379 }
380 }
381
382 /****************************************************************************
383 Try and close the oldest handle not marked for
384 expect close in the hope that the client has
385 finished with that one.
386 ****************************************************************************/
387
388 static void dptr_close_oldest(struct smbd_server_connection *sconn,
389 bool old)
390 {
391 struct dptr_struct *dptr;
392
393 /*
394 * Go to the end of the list.
395 */
396 for(dptr = sconn->searches.dirptrs; dptr && dptr->next; dptr = dptr->next)
397 ;
398
399 if(!dptr) {
400 DEBUG(0,("No old dptrs available to close oldest ?\n"));
401 return;
402 }
403
404 /*
405 * If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
406 * does not have expect_close set. If 'old' is false, close
407 * one of the new dnum handles.
408 */
409
410 for(; dptr; dptr = DLIST_PREV(dptr)) {
411 if ((old && (dptr->dnum < 256) && !dptr->expect_close) ||
412 (!old && (dptr->dnum > 255))) {
413 dptr_close_internal(dptr);
414 return;
415 }
416 }
417 }
418
419 /****************************************************************************
420 Safely do an OpenDir as root, ensuring we're in the right place.
421 ****************************************************************************/
422
423 static struct smb_Dir *open_dir_with_privilege(connection_struct *conn,
424 struct smb_request *req,
425 const char *path,
426 const char *wcard,
427 uint32_t attr)
428 {
429 struct smb_Dir *dir_hnd = NULL;
430 struct smb_filename *smb_fname_cwd;
431 char *saved_dir = vfs_GetWd(talloc_tos(), conn);
432 struct privilege_paths *priv_paths = req->priv_paths;
433 int ret;
434
435 if (saved_dir == NULL) {
436 return NULL;
437 }
438
439 if (vfs_ChDir(conn, path) == -1) {
440 return NULL;
441 }
442
443 /* Now check the stat value is the same. */
444 smb_fname_cwd = synthetic_smb_fname(talloc_tos(), ".", NULL, NULL);
445
446 if (smb_fname_cwd == NULL) {
447 goto out;
448 }
449 ret = SMB_VFS_STAT(conn, smb_fname_cwd);
450 if (ret != 0) {
451 goto out;
452 }
453
454 if (!check_same_stat(&smb_fname_cwd->st, &priv_paths->parent_name.st)) {
455 DEBUG(0,("open_dir_with_privilege: stat mismatch between %s "
456 "and %s\n",
457 path,
458 smb_fname_str_dbg(&priv_paths->parent_name)));
459 goto out;
460 }
461
462 dir_hnd = OpenDir(NULL, conn, ".", wcard, attr);
463
464 out:
465
466 vfs_ChDir(conn, saved_dir);
467 return dir_hnd;
468 }
469
470 /****************************************************************************
471 Create a new dir ptr. If the flag old_handle is true then we must allocate
472 from the bitmap range 0 - 255 as old SMBsearch directory handles are only
473 one byte long. If old_handle is false we allocate from the range
474 256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
475 a directory handle is never zero.
476 wcard must not be zero.
477 ****************************************************************************/
478
479 NTSTATUS dptr_create(connection_struct *conn,
480 struct smb_request *req,
481 files_struct *fsp,
482 const char *path, bool old_handle, bool expect_close,uint16 spid,
483 const char *wcard, bool wcard_has_wild, uint32 attr, struct dptr_struct **dptr_ret)
484 {
485 struct smbd_server_connection *sconn = conn->sconn;
486 struct dptr_struct *dptr = NULL;
487 struct smb_Dir *dir_hnd;
488
489 if (fsp && fsp->is_directory && fsp->fh->fd != -1) {
490 path = fsp->fsp_name->base_name;
491 }
492
493 DEBUG(5,("dptr_create dir=%s\n", path));
494
495 if (sconn == NULL) {
496 DEBUG(0,("dptr_create: called with fake connection_struct\n"));
497 return NT_STATUS_INTERNAL_ERROR;
498 }
499
500 if (!wcard) {
501 return NT_STATUS_INVALID_PARAMETER;
502 }
503
504 if (fsp) {
505 if (!(fsp->access_mask & SEC_DIR_LIST)) {
506 DEBUG(5,("dptr_create: directory %s "
507 "not open for LIST access\n",
508 path));
509 return NT_STATUS_ACCESS_DENIED;
510 }
511 dir_hnd = OpenDir_fsp(NULL, conn, fsp, wcard, attr);
512 } else {
513 int ret;
514 bool backup_intent = (req && req->priv_paths);
515 struct smb_filename *smb_dname;
516 NTSTATUS status;
517
518 smb_dname = synthetic_smb_fname(talloc_tos(), path,
519 NULL, NULL);
520 if (smb_dname == NULL) {
521 return NT_STATUS_NO_MEMORY;
522 }
523 if (lp_posix_pathnames()) {
524 ret = SMB_VFS_LSTAT(conn, smb_dname);
525 } else {
526 ret = SMB_VFS_STAT(conn, smb_dname);
527 }
528 if (ret == -1) {
529 return map_nt_error_from_unix(errno);
530 }
531 if (!S_ISDIR(smb_dname->st.st_ex_mode)) {
532 return NT_STATUS_NOT_A_DIRECTORY;
533 }
534 status = smbd_check_access_rights(conn,
535 smb_dname,
536 backup_intent,
537 SEC_DIR_LIST);
538 if (!NT_STATUS_IS_OK(status)) {
539 return status;
540 }
541 if (backup_intent) {
542 dir_hnd = open_dir_with_privilege(conn,
543 req,
544 path,
545 wcard,
546 attr);
547 } else {
548 dir_hnd = OpenDir(NULL, conn, path, wcard, attr);
549 }
550 }
551
552 if (!dir_hnd) {
553 return map_nt_error_from_unix(errno);
554 }
555
556 if (sconn->searches.dirhandles_open >= MAX_OPEN_DIRECTORIES) {
557 dptr_idleoldest(sconn);
558 }
559
560 dptr = talloc(NULL, struct dptr_struct);
561 if(!dptr) {
562 DEBUG(0,("talloc fail in dptr_create.\n"));
563 TALLOC_FREE(dir_hnd);
564 return NT_STATUS_NO_MEMORY;
565 }
566
567 ZERO_STRUCTP(dptr);
568
569 dptr->path = talloc_strdup(dptr, path);
570 if (!dptr->path) {
571 TALLOC_FREE(dptr);
572 TALLOC_FREE(dir_hnd);
573 return NT_STATUS_NO_MEMORY;
574 }
575 dptr->conn = conn;
576 dptr->dir_hnd = dir_hnd;
577 dptr->spid = spid;
578 dptr->expect_close = expect_close;
579 dptr->wcard = talloc_strdup(dptr, wcard);
580 if (!dptr->wcard) {
581 TALLOC_FREE(dptr);
582 TALLOC_FREE(dir_hnd);
583 return NT_STATUS_NO_MEMORY;
584 }
585 if (lp_posix_pathnames() || (wcard[0] == '.' && wcard[1] == 0)) {
586 dptr->has_wild = True;
587 } else {
588 dptr->has_wild = wcard_has_wild;
589 }
590
591 dptr->attr = attr;
592
593 if (sconn->using_smb2) {
594 goto done;
595 }
596
597 if(old_handle) {
598
599 /*
600 * This is an old-style SMBsearch request. Ensure the
601 * value we return will fit in the range 1-255.
602 */
603
604 dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 0);
605
606 if(dptr->dnum == -1 || dptr->dnum > 254) {
607
608 /*
609 * Try and close the oldest handle not marked for
610 * expect close in the hope that the client has
611 * finished with that one.
612 */
613
614 dptr_close_oldest(sconn, true);
615
616 /* Now try again... */
617 dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 0);
618 if(dptr->dnum == -1 || dptr->dnum > 254) {
619 DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
620 TALLOC_FREE(dptr);
621 TALLOC_FREE(dir_hnd);
622 return NT_STATUS_TOO_MANY_OPENED_FILES;
623 }
624 }
625 } else {
626
627 /*
628 * This is a new-style trans2 request. Allocate from
629 * a range that will return 256 - MAX_DIRECTORY_HANDLES.
630 */
631
632 dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 255);
633
634 if(dptr->dnum == -1 || dptr->dnum < 255) {
635
636 /*
637 * Try and close the oldest handle close in the hope that
638 * the client has finished with that one. This will only
639 * happen in the case of the Win98 client bug where it leaks
640 * directory handles.
641 */
642
643 dptr_close_oldest(sconn, false);
644
645 /* Now try again... */
646 dptr->dnum = bitmap_find(sconn->searches.dptr_bmap, 255);
647
648 if(dptr->dnum == -1 || dptr->dnum < 255) {
649 DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
650 TALLOC_FREE(dptr);
651 TALLOC_FREE(dir_hnd);
652 return NT_STATUS_TOO_MANY_OPENED_FILES;
653 }
654 }
655 }
656
657 bitmap_set(sconn->searches.dptr_bmap, dptr->dnum);
658
659 dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */
660
661 DLIST_ADD(sconn->searches.dirptrs, dptr);
662
663 done:
664 DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
665 dptr->dnum,path,expect_close));
666
667 *dptr_ret = dptr;
668
669 return NT_STATUS_OK;
670 }
671
672
673 /****************************************************************************
674 Wrapper functions to access the lower level directory handles.
675 ****************************************************************************/
676
677 void dptr_CloseDir(files_struct *fsp)
678 {
679 if (fsp->dptr) {
680 /*
681 * The destructor for the struct smb_Dir
682 * (fsp->dptr->dir_hnd) now handles
683 * all resource deallocation.
684 */
685 dptr_close_internal(fsp->dptr);
686 fsp->dptr = NULL;
687 }
688 }
689
690 void dptr_SeekDir(struct dptr_struct *dptr, long offset)
691 {
692 SeekDir(dptr->dir_hnd, offset);
693 }
694
695 long dptr_TellDir(struct dptr_struct *dptr)
696 {
697 return TellDir(dptr->dir_hnd);
698 }
699
700 bool dptr_has_wild(struct dptr_struct *dptr)
701 {
702 return dptr->has_wild;
703 }
704
705 int dptr_dnum(struct dptr_struct *dptr)
706 {
707 return dptr->dnum;
708 }
709
710 bool dptr_get_priv(struct dptr_struct *dptr)
711 {
712 return dptr->priv;
713 }
714
715 void dptr_set_priv(struct dptr_struct *dptr)
716 {
717 dptr->priv = true;
718 }
719
720 /****************************************************************************
721 Return the next visible file name, skipping veto'd and invisible files.
722 ****************************************************************************/
723
724 static const char *dptr_normal_ReadDirName(struct dptr_struct *dptr,
725 long *poffset, SMB_STRUCT_STAT *pst,
726 char **ptalloced)
727 {
728 /* Normal search for the next file. */
729 const char *name;
730 char *talloced = NULL;
731
732 while ((name = ReadDirName(dptr->dir_hnd, poffset, pst, &talloced))
733 != NULL) {
734 if (is_visible_file(dptr->conn, dptr->path, name, pst, True)) {
735 *ptalloced = talloced;
736 return name;
737 }
738 TALLOC_FREE(talloced);
739 }
740 return NULL;
741 }
742
743 /****************************************************************************
744 Return the next visible file name, skipping veto'd and invisible files.
745 ****************************************************************************/
746
747 char *dptr_ReadDirName(TALLOC_CTX *ctx,
748 struct dptr_struct *dptr,
749 long *poffset,
750 SMB_STRUCT_STAT *pst)
751 {
752 struct smb_filename smb_fname_base;
753 char *name = NULL;
754 const char *name_temp = NULL;
755 char *talloced = NULL;
756 char *pathreal = NULL;
757 char *found_name = NULL;
758 int ret;
759
760 SET_STAT_INVALID(*pst);
761
762 if (dptr->has_wild || dptr->did_stat) {
763 name_temp = dptr_normal_ReadDirName(dptr, poffset, pst,
764 &talloced);
765 if (name_temp == NULL) {
766 return NULL;
767 }
768 if (talloced != NULL) {
769 return talloc_move(ctx, &talloced);
770 }
771 return talloc_strdup(ctx, name_temp);
772 }
773
774 /* If poffset is -1 then we know we returned this name before and we
775 * have no wildcards. We're at the end of the directory. */
776 if (*poffset == END_OF_DIRECTORY_OFFSET) {
777 return NULL;
778 }
779
780 /* We know the stored wcard contains no wildcard characters.
781 * See if we can match with a stat call. If we can't, then set
782 * did_stat to true to ensure we only do this once and keep
783 * searching. */
784
785 dptr->did_stat = true;
786
787 /* First check if it should be visible. */
788 if (!is_visible_file(dptr->conn, dptr->path, dptr->wcard,
789 pst, true))
790 {
791 /* This only returns false if the file was found, but
792 is explicitly not visible. Set us to end of
793 directory, but return NULL as we know we can't ever
794 find it. */
795 goto ret;
796 }
797
798 if (VALID_STAT(*pst)) {
799 name = talloc_strdup(ctx, dptr->wcard);
800 goto ret;
801 }
802
803 pathreal = talloc_asprintf(ctx,
804 "%s/%s",
805 dptr->path,
806 dptr->wcard);
807 if (!pathreal)
808 return NULL;
809
810 /* Create an smb_filename with stream_name == NULL. */
811 ZERO_STRUCT(smb_fname_base);
812 smb_fname_base.base_name = pathreal;
813
814 if (SMB_VFS_STAT(dptr->conn, &smb_fname_base) == 0) {
815 *pst = smb_fname_base.st;
816 name = talloc_strdup(ctx, dptr->wcard);
817 goto clean;
818 } else {
819 /* If we get any other error than ENOENT or ENOTDIR
820 then the file exists we just can't stat it. */
821 if (errno != ENOENT && errno != ENOTDIR) {
822 name = talloc_strdup(ctx, dptr->wcard);
823 goto clean;
824 }
825 }
826
827 /* Stat failed. We know this is authoratiative if we are
828 * providing case sensitive semantics or the underlying
829 * filesystem is case sensitive.
830 */
831 if (dptr->conn->case_sensitive ||
832 !(dptr->conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH))
833 {
834 goto clean;
835 }
836
837 /*
838 * Try case-insensitive stat if the fs has the ability. This avoids
839 * scanning the whole directory.
840 */
841 ret = SMB_VFS_GET_REAL_FILENAME(dptr->conn, dptr->path, dptr->wcard,
842 ctx, &found_name);
843 if (ret == 0) {
844 name = found_name;
845 goto clean;
846 } else if (errno == ENOENT) {
847 /* The case-insensitive lookup was authoritative. */
848 goto clean;
849 }
850
851 TALLOC_FREE(pathreal);
852
853 name_temp = dptr_normal_ReadDirName(dptr, poffset, pst, &talloced);
854 if (name_temp == NULL) {
855 return NULL;
856 }
857 if (talloced != NULL) {
858 return talloc_move(ctx, &talloced);
859 }
860 return talloc_strdup(ctx, name_temp);
861
862 clean:
863 TALLOC_FREE(pathreal);
864 ret:
865 /* We need to set the underlying dir_hnd offset to -1
866 * also as this function is usually called with the
867 * output from TellDir. */
868 dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
869 return name;
870 }
871
872 /****************************************************************************
873 Search for a file by name, skipping veto'ed and not visible files.
874 ****************************************************************************/
875
876 bool dptr_SearchDir(struct dptr_struct *dptr, const char *name, long *poffset, SMB_STRUCT_STAT *pst)
877 {
878 SET_STAT_INVALID(*pst);
879
880 if (!dptr->has_wild && (dptr->dir_hnd->offset == END_OF_DIRECTORY_OFFSET)) {
881 /* This is a singleton directory and we're already at the end. */
882 *poffset = END_OF_DIRECTORY_OFFSET;
883 return False;
884 }
885
886 return SearchDir(dptr->dir_hnd, name, poffset);
887 }
888
889 /****************************************************************************
890 Initialize variables & state data at the beginning of all search SMB requests.
891 ****************************************************************************/
892 void dptr_init_search_op(struct dptr_struct *dptr)
893 {
894 SMB_VFS_INIT_SEARCH_OP(dptr->conn, dptr->dir_hnd->dir);
895 }
896
897 /****************************************************************************
898 Fill the 5 byte server reserved dptr field.
899 ****************************************************************************/
900
901 bool dptr_fill(struct smbd_server_connection *sconn,
902 char *buf1,unsigned int key)
903 {
904 unsigned char *buf = (unsigned char *)buf1;
905 struct dptr_struct *dptr = dptr_get(sconn, key, false);
906 uint32 offset;
907 if (!dptr) {
908 DEBUG(1,("filling null dirptr %d\n",key));
909 return(False);
910 }
911 offset = (uint32)TellDir(dptr->dir_hnd);
912 DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
913 (long)dptr->dir_hnd,(int)offset));
914 buf[0] = key;
915 SIVAL(buf,1,offset);
916 return(True);
917 }
918
919 /****************************************************************************
920 Fetch the dir ptr and seek it given the 5 byte server field.
921 ****************************************************************************/
922
923 struct dptr_struct *dptr_fetch(struct smbd_server_connection *sconn,
924 char *buf, int *num)
925 {
926 unsigned int key = *(unsigned char *)buf;
927 struct dptr_struct *dptr = dptr_get(sconn, key, false);
928 uint32 offset;
929 long seekoff;
930
931 if (!dptr) {
932 DEBUG(3,("fetched null dirptr %d\n",key));
933 return(NULL);
934 }
935 *num = key;
936 offset = IVAL(buf,1);
937 if (offset == (uint32)-1) {
938 seekoff = END_OF_DIRECTORY_OFFSET;
939 } else {
940 seekoff = (long)offset;
941 }
942 SeekDir(dptr->dir_hnd,seekoff);
943 DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
944 key, dptr->path, (int)seekoff));
945 return(dptr);
946 }
947
948 /****************************************************************************
949 Fetch the dir ptr.
950 ****************************************************************************/
951
952 struct dptr_struct *dptr_fetch_lanman2(struct smbd_server_connection *sconn,
953 int dptr_num)
954 {
955 struct dptr_struct *dptr = dptr_get(sconn, dptr_num, false);
956
957 if (!dptr) {
958 DEBUG(3,("fetched null dirptr %d\n",dptr_num));
959 return(NULL);
960 }
961 DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr->path));
962 return(dptr);
963 }
964
965 static bool mangle_mask_match(connection_struct *conn,
966 const char *filename,
967 const char *mask)
968 {
969 char mname[13];
970
971 if (!name_to_8_3(filename,mname,False,conn->params)) {
972 return False;
973 }
974 return mask_match_search(mname,mask,False);
975 }
976
977 bool smbd_dirptr_get_entry(TALLOC_CTX *ctx,
978 struct dptr_struct *dirptr,
979 const char *mask,
980 uint32_t dirtype,
981 bool dont_descend,
982 bool ask_sharemode,
983 bool (*match_fn)(TALLOC_CTX *ctx,
984 void *private_data,
985 const char *dname,
986 const char *mask,
987 char **_fname),
988 bool (*mode_fn)(TALLOC_CTX *ctx,
989 void *private_data,
990 struct smb_filename *smb_fname,
991 uint32_t *_mode),
992 void *private_data,
993 char **_fname,
994 struct smb_filename **_smb_fname,
995 uint32_t *_mode,
996 long *_prev_offset)
997 {
998 connection_struct *conn = dirptr->conn;
999 size_t slashlen;
1000 size_t pathlen;
1001
1002 *_smb_fname = NULL;
1003 *_mode = 0;
1004
1005 pathlen = strlen(dirptr->path);
1006 slashlen = ( dirptr->path[pathlen-1] != '/') ? 1 : 0;
1007
1008 while (true) {
1009 long cur_offset;
1010 long prev_offset;
1011 SMB_STRUCT_STAT sbuf;
1012 char *dname = NULL;
1013 bool isdots;
1014 char *fname = NULL;
1015 char *pathreal = NULL;
1016 struct smb_filename smb_fname;
1017 uint32_t mode = 0;
1018 bool ok;
1019
1020 cur_offset = dptr_TellDir(dirptr);
1021 prev_offset = cur_offset;
1022 dname = dptr_ReadDirName(ctx, dirptr, &cur_offset, &sbuf);
1023
1024 DEBUG(6,("smbd_dirptr_get_entry: dirptr 0x%lx now at offset %ld\n",
1025 (long)dirptr, cur_offset));
1026
1027 if (dname == NULL) {
1028 return false;
1029 }
1030
1031 isdots = (ISDOT(dname) || ISDOTDOT(dname));
1032 if (dont_descend && !isdots) {
1033 TALLOC_FREE(dname);
1034 continue;
1035 }
1036
1037 /*
1038 * fname may get mangled, dname is never mangled.
1039 * Whenever we're accessing the filesystem we use
1040 * pathreal which is composed from dname.
1041 */
1042
1043 ok = match_fn(ctx, private_data, dname, mask, &fname);
1044 if (!ok) {
1045 TALLOC_FREE(dname);
1046 continue;
1047 }
1048
1049 /*
1050 * This used to be
1051 * pathreal = talloc_asprintf(ctx, "%s%s%s", dirptr->path,
1052 * needslash?"/":"", dname);
1053 * but this was measurably slower than doing the memcpy.
1054 */
1055
1056 pathreal = talloc_array(
1057 ctx, char,
1058 pathlen + slashlen + talloc_get_size(dname));
1059 if (!pathreal) {
1060 TALLOC_FREE(dname);
1061 TALLOC_FREE(fname);
1062 return false;
1063 }
1064
1065 memcpy(pathreal, dirptr->path, pathlen);
1066 pathreal[pathlen] = '/';
1067 memcpy(pathreal + slashlen + pathlen, dname,
1068 talloc_get_size(dname));
1069
1070 /* Create smb_fname with NULL stream_name. */
1071 ZERO_STRUCT(smb_fname);
1072 smb_fname.base_name = pathreal;
1073 smb_fname.st = sbuf;
1074
1075 ok = mode_fn(ctx, private_data, &smb_fname, &mode);
1076 if (!ok) {
1077 TALLOC_FREE(dname);
1078 TALLOC_FREE(fname);
1079 TALLOC_FREE(pathreal);
1080 continue;
1081 }
1082
1083 if (!dir_check_ftype(mode, dirtype)) {
1084 DEBUG(5,("[%s] attribs 0x%x didn't match 0x%x\n",
1085 fname, (unsigned int)mode, (unsigned int)dirtype));
1086 TALLOC_FREE(dname);
1087 TALLOC_FREE(fname);
1088 TALLOC_FREE(pathreal);
1089 continue;
1090 }
1091
1092 if (ask_sharemode) {
1093 struct timespec write_time_ts;
1094 struct file_id fileid;
1095
1096 fileid = vfs_file_id_from_sbuf(conn,
1097 &smb_fname.st);
1098 get_file_infos(fileid, 0, NULL, &write_time_ts);
1099 if (!null_timespec(write_time_ts)) {
1100 update_stat_ex_mtime(&smb_fname.st,
1101 write_time_ts);
1102 }
1103 }
1104
1105 DEBUG(3,("smbd_dirptr_get_entry mask=[%s] found %s "
1106 "fname=%s (%s)\n",
1107 mask, smb_fname_str_dbg(&smb_fname),
1108 dname, fname));
1109
1110 DirCacheAdd(dirptr->dir_hnd, dname, cur_offset);
1111
1112 TALLOC_FREE(dname);
1113
1114 *_smb_fname = cp_smb_filename(ctx, &smb_fname);
1115 TALLOC_FREE(pathreal);
1116 if (*_smb_fname == NULL) {
1117 return false;
1118 }
1119 *_fname = fname;
1120 *_mode = mode;
1121 *_prev_offset = prev_offset;
1122
1123 return true;
1124 }
1125
1126 return false;
1127 }
1128
1129 /****************************************************************************
1130 Get an 8.3 directory entry.
1131 ****************************************************************************/
1132
1133 static bool smbd_dirptr_8_3_match_fn(TALLOC_CTX *ctx,
1134 void *private_data,
1135 const char *dname,
1136 const char *mask,
1137 char **_fname)
1138 {
1139 connection_struct *conn = (connection_struct *)private_data;
1140
1141 if ((strcmp(mask,"*.*") == 0) ||
1142 mask_match_search(dname, mask, false) ||
1143 mangle_mask_match(conn, dname, mask)) {
1144 char mname[13];
1145 const char *fname;
1146
1147 if (!mangle_is_8_3(dname, false, conn->params)) {
1148 bool ok = name_to_8_3(dname, mname, false,
1149 conn->params);
1150 if (!ok) {
1151 return false;
1152 }
1153 fname = mname;
1154 } else {
1155 fname = dname;
1156 }
1157
1158 *_fname = talloc_strdup(ctx, fname);
1159 if (*_fname == NULL) {
1160 return false;
1161 }
1162
1163 return true;
1164 }
1165
1166 return false;
1167 }
1168
1169 static bool smbd_dirptr_8_3_mode_fn(TALLOC_CTX *ctx,
1170 void *private_data,
1171 struct smb_filename *smb_fname,
1172 uint32_t *_mode)
1173 {
1174 connection_struct *conn = (connection_struct *)private_data;
1175
1176 if (!VALID_STAT(smb_fname->st)) {
1177 if ((SMB_VFS_STAT(conn, smb_fname)) != 0) {
1178 DEBUG(5,("smbd_dirptr_8_3_mode_fn: "
1179 "Couldn't stat [%s]. Error "
1180 "= %s\n",
1181 smb_fname_str_dbg(smb_fname),
1182 strerror(errno)));
1183 return false;
1184 }
1185 }
1186
1187 *_mode = dos_mode(conn, smb_fname);
1188 return true;
1189 }
1190
1191 bool get_dir_entry(TALLOC_CTX *ctx,
1192 struct dptr_struct *dirptr,
1193 const char *mask,
1194 uint32_t dirtype,
1195 char **_fname,
1196 off_t *_size,
1197 uint32_t *_mode,
1198 struct timespec *_date,
1199 bool check_descend,
1200 bool ask_sharemode)
1201 {
1202 connection_struct *conn = dirptr->conn;
1203 char *fname = NULL;
1204 struct smb_filename *smb_fname = NULL;
1205 uint32_t mode = 0;
1206 long prev_offset;
1207 bool ok;
1208
1209 ok = smbd_dirptr_get_entry(ctx,
1210 dirptr,
1211 mask,
1212 dirtype,
1213 check_descend,
1214 ask_sharemode,
1215 smbd_dirptr_8_3_match_fn,
1216 smbd_dirptr_8_3_mode_fn,
1217 conn,
1218 &fname,
1219 &smb_fname,
1220 &mode,
1221 &prev_offset);
1222 if (!ok) {
1223 return false;
1224 }
1225
1226 *_fname = talloc_move(ctx, &fname);
1227 *_size = smb_fname->st.st_ex_size;
1228 *_mode = mode;
1229 *_date = smb_fname->st.st_ex_mtime;
1230 TALLOC_FREE(smb_fname);
1231 return true;
1232 }
1233
1234 /*******************************************************************
1235 Check to see if a user can read a file. This is only approximate,
1236 it is used as part of the "hide unreadable" option. Don't
1237 use it for anything security sensitive.
1238 ********************************************************************/
1239
1240 static bool user_can_read_file(connection_struct *conn,
1241 struct smb_filename *smb_fname)
1242 {
1243 /*
1244 * Never hide files from the root user.
1245 * We use (uid_t)0 here not sec_initial_uid()
1246 * as make test uses a single user context.
1247 */
1248
1249 if (get_current_uid(conn) == (uid_t)0) {
1250 return True;
1251 }
1252
1253 return NT_STATUS_IS_OK(smbd_check_access_rights(conn,
1254 smb_fname,
1255 false,
1256 FILE_READ_DATA));
1257 }
1258
1259 /*******************************************************************
1260 Check to see if a user can write a file (and only files, we do not
1261 check dirs on this one). This is only approximate,
1262 it is used as part of the "hide unwriteable" option. Don't
1263 use it for anything security sensitive.
1264 ********************************************************************/
1265
1266 static bool user_can_write_file(connection_struct *conn,
1267 const struct smb_filename *smb_fname)
1268 {
1269 /*
1270 * Never hide files from the root user.
1271 * We use (uid_t)0 here not sec_initial_uid()
1272 * as make test uses a single user context.
1273 */
1274
1275 if (get_current_uid(conn) == (uid_t)0) {
1276 return True;
1277 }
1278
1279 SMB_ASSERT(VALID_STAT(smb_fname->st));
1280
1281 /* Pseudo-open the file */
1282
1283 if(S_ISDIR(smb_fname->st.st_ex_mode)) {
1284 return True;
1285 }
1286
1287 return can_write_to_file(conn, smb_fname);
1288 }
1289
1290 /*******************************************************************
1291 Is a file a "special" type ?
1292 ********************************************************************/
1293
1294 static bool file_is_special(connection_struct *conn,
1295 const struct smb_filename *smb_fname)
1296 {
1297 /*
1298 * Never hide files from the root user.
1299 * We use (uid_t)0 here not sec_initial_uid()
1300 * as make test uses a single user context.
1301 */
1302
1303 if (get_current_uid(conn) == (uid_t)0) {
1304 return False;
1305 }
1306
1307 SMB_ASSERT(VALID_STAT(smb_fname->st));
1308
1309 if (S_ISREG(smb_fname->st.st_ex_mode) ||
1310 S_ISDIR(smb_fname->st.st_ex_mode) ||
1311 S_ISLNK(smb_fname->st.st_ex_mode))
1312 return False;
1313
1314 return True;
1315 }
1316
1317 /*******************************************************************
1318 Should the file be seen by the client?
1319 NOTE: A successful return is no guarantee of the file's existence.
1320 ********************************************************************/
1321
1322 bool is_visible_file(connection_struct *conn, const char *dir_path,
1323 const char *name, SMB_STRUCT_STAT *pst, bool use_veto)
1324 {
1325 bool hide_unreadable = lp_hideunreadable(SNUM(conn));
1326 bool hide_unwriteable = lp_hideunwriteable_files(SNUM(conn));
1327 bool hide_special = lp_hide_special_files(SNUM(conn));
1328 char *entry = NULL;
1329 struct smb_filename *smb_fname_base = NULL;
1330 bool ret = false;
1331
1332 if ((strcmp(".",name) == 0) || (strcmp("..",name) == 0)) {
1333 return True; /* . and .. are always visible. */
1334 }
1335
1336 /* If it's a vetoed file, pretend it doesn't even exist */
1337 if (use_veto && IS_VETO_PATH(conn, name)) {
1338 DEBUG(10,("is_visible_file: file %s is vetoed.\n", name ));
1339 return False;
1340 }
1341
1342 if (hide_unreadable || hide_unwriteable || hide_special) {
1343 entry = talloc_asprintf(talloc_tos(), "%s/%s", dir_path, name);
1344 if (!entry) {
1345 ret = false;
1346 goto out;
1347 }
1348
1349 /* Create an smb_filename with stream_name == NULL. */
1350 smb_fname_base = synthetic_smb_fname(talloc_tos(), entry, NULL,
1351 pst);
1352 if (smb_fname_base == NULL) {
1353 ret = false;
1354 goto out;
1355 }
1356
1357 /* If the file name does not exist, there's no point checking
1358 * the configuration options. We succeed, on the basis that the
1359 * checks *might* have passed if the file was present.
1360 */
1361 if (!VALID_STAT(*pst)) {
1362 if (SMB_VFS_STAT(conn, smb_fname_base) != 0) {
1363 ret = true;
1364 goto out;
1365 } else {
1366 *pst = smb_fname_base->st;
1367 }
1368 }
1369
1370 /* Honour _hide unreadable_ option */
1371 if (hide_unreadable &&
1372 !user_can_read_file(conn, smb_fname_base)) {
1373 DEBUG(10,("is_visible_file: file %s is unreadable.\n",
1374 entry ));
1375 ret = false;
1376 goto out;
1377 }
1378 /* Honour _hide unwriteable_ option */
1379 if (hide_unwriteable && !user_can_write_file(conn,
1380 smb_fname_base)) {
1381 DEBUG(10,("is_visible_file: file %s is unwritable.\n",
1382 entry ));
1383 ret = false;
1384 goto out;
1385 }
1386 /* Honour _hide_special_ option */
1387 if (hide_special && file_is_special(conn, smb_fname_base)) {
1388 DEBUG(10,("is_visible_file: file %s is special.\n",
1389 entry ));
1390 ret = false;
1391 goto out;
1392 }
1393 }
1394
1395 ret = true;
1396 out:
1397 TALLOC_FREE(smb_fname_base);
1398 TALLOC_FREE(entry);
1399 return ret;
1400 }
1401
1402 static int smb_Dir_destructor(struct smb_Dir *dirp)
1403 {
1404 if (dirp->dir != NULL) {
1405 SMB_VFS_CLOSEDIR(dirp->conn,dirp->dir);
1406 if (dirp->fsp != NULL) {
1407 /*
1408 * The SMB_VFS_CLOSEDIR above
1409 * closes the underlying fd inside
1410 * dirp->fsp.
1411 */
1412 dirp->fsp->fh->fd = -1;
1413 if (dirp->fsp->dptr != NULL) {
1414 SMB_ASSERT(dirp->fsp->dptr->dir_hnd == dirp);
1415 dirp->fsp->dptr->dir_hnd = NULL;
1416 }
1417 dirp->fsp = NULL;
1418 }
1419 }
1420 if (dirp->conn->sconn && !dirp->conn->sconn->using_smb2) {
1421 dirp->conn->sconn->searches.dirhandles_open--;
1422 }
1423 return 0;
1424 }
1425
1426 /*******************************************************************
1427 Open a directory.
1428 ********************************************************************/
1429
1430 struct smb_Dir *OpenDir(TALLOC_CTX *mem_ctx, connection_struct *conn,
1431 const char *name,
1432 const char *mask,
1433 uint32 attr)
1434 {
1435 struct smb_Dir *dirp = talloc_zero(mem_ctx, struct smb_Dir);
1436 struct smbd_server_connection *sconn = conn->sconn;
1437
1438 if (!dirp) {
1439 return NULL;
1440 }
1441
1442 dirp->conn = conn;
1443 dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1444
1445 dirp->dir_path = talloc_strdup(dirp, name);
1446 if (!dirp->dir_path) {
1447 errno = ENOMEM;
1448 goto fail;
1449 }
1450
1451 if (sconn && !sconn->using_smb2) {
1452 sconn->searches.dirhandles_open++;
1453 }
1454 talloc_set_destructor(dirp, smb_Dir_destructor);
1455
1456 dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1457 if (!dirp->dir) {
1458 DEBUG(5,("OpenDir: Can't open %s. %s\n", dirp->dir_path,
1459 strerror(errno) ));
1460 goto fail;
1461 }
1462
1463 return dirp;
1464
1465 fail:
1466 TALLOC_FREE(dirp);
1467 return NULL;
1468 }
1469
1470 /*******************************************************************
1471 Open a directory from an fsp.
1472 ********************************************************************/
1473
1474 static struct smb_Dir *OpenDir_fsp(TALLOC_CTX *mem_ctx, connection_struct *conn,
1475 files_struct *fsp,
1476 const char *mask,
1477 uint32 attr)
1478 {
1479 struct smb_Dir *dirp = talloc_zero(mem_ctx, struct smb_Dir);
1480 struct smbd_server_connection *sconn = conn->sconn;
1481
1482 if (!dirp) {
1483 return NULL;
1484 }
1485
1486 dirp->conn = conn;
1487 dirp->name_cache_size = lp_directory_name_cache_size(SNUM(conn));
1488
1489 dirp->dir_path = talloc_strdup(dirp, fsp->fsp_name->base_name);
1490 if (!dirp->dir_path) {
1491 errno = ENOMEM;
1492 goto fail;
1493 }
1494
1495 if (sconn && !sconn->using_smb2) {
1496 sconn->searches.dirhandles_open++;
1497 }
1498 talloc_set_destructor(dirp, smb_Dir_destructor);
1499
1500 if (fsp->is_directory && fsp->fh->fd != -1) {
1501 dirp->dir = SMB_VFS_FDOPENDIR(fsp, mask, attr);
1502 if (dirp->dir != NULL) {
1503 dirp->fsp = fsp;
1504 } else {
1505 DEBUG(10,("OpenDir_fsp: SMB_VFS_FDOPENDIR on %s returned "
1506 "NULL (%s)\n",
1507 dirp->dir_path,
1508 strerror(errno)));
1509 if (errno != ENOSYS) {
1510 return NULL;
1511 }
1512 }
1513 }
1514
1515 if (dirp->dir == NULL) {
1516 /* FDOPENDIR didn't work. Use OPENDIR instead. */
1517 dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
1518 }
1519
1520 if (!dirp->dir) {
1521 DEBUG(5,("OpenDir_fsp: Can't open %s. %s\n", dirp->dir_path,
1522 strerror(errno) ));
1523 goto fail;
1524 }
1525
1526 return dirp;
1527
1528 fail:
1529 TALLOC_FREE(dirp);
1530 return NULL;
1531 }
1532
1533
1534 /*******************************************************************
1535 Read from a directory.
1536 Return directory entry, current offset, and optional stat information.
1537 Don't check for veto or invisible files.
1538 ********************************************************************/
1539
1540 const char *ReadDirName(struct smb_Dir *dirp, long *poffset,
1541 SMB_STRUCT_STAT *sbuf, char **ptalloced)
1542 {
1543 const char *n;
1544 char *talloced = NULL;
1545 connection_struct *conn = dirp->conn;
1546
1547 /* Cheat to allow . and .. to be the first entries returned. */
1548 if (((*poffset == START_OF_DIRECTORY_OFFSET) ||
1549 (*poffset == DOT_DOT_DIRECTORY_OFFSET)) && (dirp->file_number < 2))
1550 {
1551 if (dirp->file_number == 0) {
1552 n = ".";
1553 *poffset = dirp->offset = START_OF_DIRECTORY_OFFSET;
1554 } else {
1555 n = "..";
1556 *poffset = dirp->offset = DOT_DOT_DIRECTORY_OFFSET;
1557 }
1558 dirp->file_number++;
1559 *ptalloced = NULL;
1560 return n;
1561 } else if (*poffset == END_OF_DIRECTORY_OFFSET) {
1562 *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1563 return NULL;
1564 } else {
1565 /* A real offset, seek to it. */
1566 SeekDir(dirp, *poffset);
1567 }
1568
1569 while ((n = vfs_readdirname(conn, dirp->dir, sbuf, &talloced))) {
1570 /* Ignore . and .. - we've already returned them. */
1571 if (*n == '.') {
1572 if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
1573 TALLOC_FREE(talloced);
1574 continue;
1575 }
1576 }
1577 *poffset = dirp->offset = SMB_VFS_TELLDIR(conn, dirp->dir);
1578 *ptalloced = talloced;
1579 dirp->file_number++;
1580 return n;
1581 }
1582 *poffset = dirp->offset = END_OF_DIRECTORY_OFFSET;
1583 *ptalloced = NULL;
1584 return NULL;
1585 }
1586
1587 /*******************************************************************
1588 Rewind to the start.
1589 ********************************************************************/
1590
1591 void RewindDir(struct smb_Dir *dirp, long *poffset)
1592 {
1593 SMB_VFS_REWINDDIR(dirp->conn, dirp->dir);
1594 dirp->file_number = 0;
1595 dirp->offset = START_OF_DIRECTORY_OFFSET;
1596 *poffset = START_OF_DIRECTORY_OFFSET;
1597 }
1598
1599 /*******************************************************************
1600 Seek a dir.
1601 ********************************************************************/
1602
1603 void SeekDir(struct smb_Dir *dirp, long offset)
1604 {
1605 if (offset != dirp->offset) {
1606 if (offset == START_OF_DIRECTORY_OFFSET) {
1607 RewindDir(dirp, &offset);
1608 /*
1609 * Ok we should really set the file number here
1610 * to 1 to enable ".." to be returned next. Trouble
1611 * is I'm worried about callers using SeekDir(dirp,0)
1612 * as equivalent to RewindDir(). So leave this alone
1613 * for now.
1614 */
1615 } else if (offset == DOT_DOT_DIRECTORY_OFFSET) {
1616 RewindDir(dirp, &offset);
1617 /*
1618 * Set the file number to 2 - we want to get the first
1619 * real file entry (the one we return after "..")
1620 * on the next ReadDir.
1621 */
1622 dirp->file_number = 2;
1623 } else if (offset == END_OF_DIRECTORY_OFFSET) {
1624 ; /* Don't seek in this case. */
1625 } else {
1626 SMB_VFS_SEEKDIR(dirp->conn, dirp->dir, offset);
1627 }
1628 dirp->offset = offset;
1629 }
1630 }
1631
1632 /*******************************************************************
1633 Tell a dir position.
1634 ********************************************************************/
1635
1636 long TellDir(struct smb_Dir *dirp)
1637 {
1638 return(dirp->offset);
1639 }
1640
1641 /*******************************************************************
1642 Add an entry into the dcache.
1643 ********************************************************************/
1644
1645 static void DirCacheAdd(struct smb_Dir *dirp, const char *name, long offset)
1646 {
1647 struct name_cache_entry *e;
1648
1649 if (dirp->name_cache_size == 0) {
1650 return;
1651 }
1652
1653 if (dirp->name_cache == NULL) {
1654 dirp->name_cache = talloc_zero_array(
1655 dirp, struct name_cache_entry, dirp->name_cache_size);
1656
1657 if (dirp->name_cache == NULL) {
1658 return;
1659 }
1660 }
1661
1662 dirp->name_cache_index = (dirp->name_cache_index+1) %
1663 dirp->name_cache_size;
1664 e = &dirp->name_cache[dirp->name_cache_index];
1665 TALLOC_FREE(e->name);
1666 e->name = talloc_strdup(dirp, name);
1667 e->offset = offset;
1668 }
1669
1670 /*******************************************************************
1671 Find an entry by name. Leave us at the offset after it.
1672 Don't check for veto or invisible files.
1673 ********************************************************************/
1674
1675 bool SearchDir(struct smb_Dir *dirp, const char *name, long *poffset)
1676 {
1677 int i;
1678 const char *entry = NULL;
1679 char *talloced = NULL;
1680 connection_struct *conn = dirp->conn;
1681
1682 /* Search back in the name cache. */
1683 if (dirp->name_cache_size && dirp->name_cache) {
1684 for (i = dirp->name_cache_index; i >= 0; i--) {
1685 struct name_cache_entry *e = &dirp->name_cache[i];
1686 if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1687 *poffset = e->offset;
1688 SeekDir(dirp, e->offset);
1689 return True;
1690 }
1691 }
1692 for (i = dirp->name_cache_size - 1; i > dirp->name_cache_index; i--) {
1693 struct name_cache_entry *e = &dirp->name_cache[i];
1694 if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
1695 *poffset = e->offset;
1696 SeekDir(dirp, e->offset);
1697 return True;
1698 }
1699 }
1700 }
1701
1702 /* Not found in the name cache. Rewind directory and start from scratch. */
1703 SMB_VFS_REWINDDIR(conn, dirp->dir);
1704 dirp->file_number = 0;
1705 *poffset = START_OF_DIRECTORY_OFFSET;
1706 while ((entry = ReadDirName(dirp, poffset, NULL, &talloced))) {
1707 if (conn->case_sensitive ? (strcmp(entry, name) == 0) : strequal(entry, name)) {
1708 TALLOC_FREE(talloced);
1709 return True;
1710 }
1711 TALLOC_FREE(talloced);
1712 }
1713 return False;
1714 }
1715
1716 /*****************************************************************
1717 Is this directory empty ?
1718 *****************************************************************/
1719
1720 NTSTATUS can_delete_directory_fsp(files_struct *fsp)
1721 {
1722 NTSTATUS status = NT_STATUS_OK;
1723 long dirpos = 0;
1724 const char *dname = NULL;
1725 const char *dirname = fsp->fsp_name->base_name;
1726 char *talloced = NULL;
1727 SMB_STRUCT_STAT st;
1728 struct connection_struct *conn = fsp->conn;
1729 struct smb_Dir *dir_hnd = OpenDir_fsp(talloc_tos(),
1730 conn,
1731 fsp,
1732 NULL,
1733 0);
1734
1735 if (!dir_hnd) {
1736 return map_nt_error_from_unix(errno);
1737 }
1738
1739 while ((dname = ReadDirName(dir_hnd, &dirpos, &st, &talloced))) {
1740 /* Quick check for "." and ".." */
1741 if (dname[0] == '.') {
1742 if (!dname[1] || (dname[1] == '.' && !dname[2])) {
1743 TALLOC_FREE(talloced);
1744 continue;
1745 }
1746 }
1747
1748 if (!is_visible_file(conn, dirname, dname, &st, True)) {
1749 TALLOC_FREE(talloced);
1750 continue;
1751 }
1752
1753 DEBUG(10,("got name %s - can't delete\n",
1754 dname ));
1755 status = NT_STATUS_DIRECTORY_NOT_EMPTY;
1756 break;
1757 }
1758 TALLOC_FREE(talloced);
1759 TALLOC_FREE(dir_hnd);
1760
1761 return status;
1762 }
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