source: branches/samba-3.2.x/source/smbd/close.c@ 204

Last change on this file since 204 was 137, checked in by Paul Smedley, 17 years ago

Update trunk to 3.2.0rc2

File size: 20.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 file closing
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1992-2007.
6 Copyright (C) Volker Lendecke 2005
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "includes.h"
23
24extern struct current_user current_user;
25
26/****************************************************************************
27 Run a file if it is a magic script.
28****************************************************************************/
29
30static void check_magic(struct files_struct *fsp)
31{
32 int ret;
33 const char *magic_output = NULL;
34 SMB_STRUCT_STAT st;
35 int tmp_fd, outfd;
36 TALLOC_CTX *ctx = NULL;
37 const char *p;
38 struct connection_struct *conn = fsp->conn;
39
40 if (!*lp_magicscript(SNUM(conn))) {
41 return;
42 }
43
44 DEBUG(5,("checking magic for %s\n",fsp->fsp_name));
45
46 if (!(p = strrchr_m(fsp->fsp_name,'/'))) {
47 p = fsp->fsp_name;
48 } else {
49 p++;
50 }
51
52 if (!strequal(lp_magicscript(SNUM(conn)),p)) {
53 return;
54 }
55
56 ctx = talloc_stackframe();
57
58 if (*lp_magicoutput(SNUM(conn))) {
59 magic_output = lp_magicoutput(SNUM(conn));
60 } else {
61 magic_output = talloc_asprintf(ctx,
62 "%s.out",
63 fsp->fsp_name);
64 }
65 if (!magic_output) {
66 TALLOC_FREE(ctx);
67 return;
68 }
69
70 chmod(fsp->fsp_name,0755);
71 ret = smbrun(fsp->fsp_name,&tmp_fd);
72 DEBUG(3,("Invoking magic command %s gave %d\n",
73 fsp->fsp_name,ret));
74
75 unlink(fsp->fsp_name);
76 if (ret != 0 || tmp_fd == -1) {
77 if (tmp_fd != -1) {
78 close(tmp_fd);
79 }
80 TALLOC_FREE(ctx);
81 return;
82 }
83 outfd = open(magic_output, O_CREAT|O_EXCL|O_RDWR, 0600);
84 if (outfd == -1) {
85 close(tmp_fd);
86 TALLOC_FREE(ctx);
87 return;
88 }
89
90 if (sys_fstat(tmp_fd,&st) == -1) {
91 close(tmp_fd);
92 close(outfd);
93 return;
94 }
95
96 transfer_file(tmp_fd,outfd,(SMB_OFF_T)st.st_size);
97 close(tmp_fd);
98 close(outfd);
99 TALLOC_FREE(ctx);
100}
101
102/****************************************************************************
103 Common code to close a file or a directory.
104****************************************************************************/
105
106static NTSTATUS close_filestruct(files_struct *fsp)
107{
108 NTSTATUS status = NT_STATUS_OK;
109 connection_struct *conn = fsp->conn;
110
111 if (fsp->fh->fd != -1) {
112 if(flush_write_cache(fsp, CLOSE_FLUSH) == -1) {
113 status = map_nt_error_from_unix(errno);
114 }
115 delete_write_cache(fsp);
116 }
117
118 conn->num_files_open--;
119 return status;
120}
121
122/****************************************************************************
123 If any deferred opens are waiting on this close, notify them.
124****************************************************************************/
125
126static void notify_deferred_opens(struct share_mode_lock *lck)
127{
128 int i;
129
130 for (i=0; i<lck->num_share_modes; i++) {
131 struct share_mode_entry *e = &lck->share_modes[i];
132
133 if (!is_deferred_open_entry(e)) {
134 continue;
135 }
136
137 if (procid_is_me(&e->pid)) {
138 /*
139 * We need to notify ourself to retry the open. Do
140 * this by finding the queued SMB record, moving it to
141 * the head of the queue and changing the wait time to
142 * zero.
143 */
144 schedule_deferred_open_smb_message(e->op_mid);
145 } else {
146 char msg[MSG_SMB_SHARE_MODE_ENTRY_SIZE];
147
148 share_mode_entry_to_message(msg, e);
149
150 messaging_send_buf(smbd_messaging_context(),
151 e->pid, MSG_SMB_OPEN_RETRY,
152 (uint8 *)msg,
153 MSG_SMB_SHARE_MODE_ENTRY_SIZE);
154 }
155 }
156}
157
158/****************************************************************************
159 Delete all streams
160****************************************************************************/
161
162static NTSTATUS delete_all_streams(connection_struct *conn, const char *fname)
163{
164 struct stream_struct *stream_info;
165 int i;
166 unsigned int num_streams;
167 TALLOC_CTX *frame = talloc_stackframe();
168 NTSTATUS status;
169
170 status = SMB_VFS_STREAMINFO(conn, NULL, fname, talloc_tos(),
171 &num_streams, &stream_info);
172
173 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_IMPLEMENTED)) {
174 DEBUG(10, ("no streams around\n"));
175 TALLOC_FREE(frame);
176 return NT_STATUS_OK;
177 }
178
179 if (!NT_STATUS_IS_OK(status)) {
180 DEBUG(10, ("SMB_VFS_STREAMINFO failed: %s\n",
181 nt_errstr(status)));
182 goto fail;
183 }
184
185 DEBUG(10, ("delete_all_streams found %d streams\n",
186 num_streams));
187
188 if (num_streams == 0) {
189 TALLOC_FREE(frame);
190 return NT_STATUS_OK;
191 }
192
193 for (i=0; i<num_streams; i++) {
194 int res;
195 char *streamname;
196
197 if (strequal(stream_info[i].name, "::$DATA")) {
198 continue;
199 }
200
201 streamname = talloc_asprintf(talloc_tos(), "%s%s", fname,
202 stream_info[i].name);
203
204 if (streamname == NULL) {
205 DEBUG(0, ("talloc_aprintf failed\n"));
206 status = NT_STATUS_NO_MEMORY;
207 goto fail;
208 }
209
210 res = SMB_VFS_UNLINK(conn, streamname);
211
212 TALLOC_FREE(streamname);
213
214 if (res == -1) {
215 status = map_nt_error_from_unix(errno);
216 DEBUG(10, ("Could not delete stream %s: %s\n",
217 streamname, strerror(errno)));
218 break;
219 }
220 }
221
222 fail:
223 TALLOC_FREE(frame);
224 return status;
225}
226
227/****************************************************************************
228 Deal with removing a share mode on last close.
229****************************************************************************/
230
231static NTSTATUS close_remove_share_mode(files_struct *fsp,
232 enum file_close_type close_type)
233{
234 connection_struct *conn = fsp->conn;
235 bool delete_file = false;
236 bool changed_user = false;
237 struct share_mode_lock *lck;
238 SMB_STRUCT_STAT sbuf;
239 NTSTATUS status = NT_STATUS_OK;
240 int ret;
241 struct file_id id;
242
243 /*
244 * Lock the share entries, and determine if we should delete
245 * on close. If so delete whilst the lock is still in effect.
246 * This prevents race conditions with the file being created. JRA.
247 */
248
249 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
250 NULL);
251
252 if (lck == NULL) {
253 DEBUG(0, ("close_remove_share_mode: Could not get share mode "
254 "lock for file %s\n", fsp->fsp_name));
255 return NT_STATUS_INVALID_PARAMETER;
256 }
257
258 if (fsp->write_time_forced) {
259 set_close_write_time(fsp, lck->changed_write_time);
260 }
261
262 if (!del_share_mode(lck, fsp)) {
263 DEBUG(0, ("close_remove_share_mode: Could not delete share "
264 "entry for file %s\n", fsp->fsp_name));
265 }
266
267 if (fsp->initial_delete_on_close && (lck->delete_token == NULL)) {
268 bool became_user = False;
269
270 /* Initial delete on close was set and no one else
271 * wrote a real delete on close. */
272
273 if (current_user.vuid != fsp->vuid) {
274 become_user(conn, fsp->vuid);
275 became_user = True;
276 }
277 set_delete_on_close_lck(lck, True, &current_user.ut);
278 if (became_user) {
279 unbecome_user();
280 }
281 }
282
283 delete_file = lck->delete_on_close;
284
285 if (delete_file) {
286 int i;
287 /* See if others still have the file open. If this is the
288 * case, then don't delete. If all opens are POSIX delete now. */
289 for (i=0; i<lck->num_share_modes; i++) {
290 struct share_mode_entry *e = &lck->share_modes[i];
291 if (is_valid_share_mode_entry(e)) {
292 if (fsp->posix_open && (e->flags & SHARE_MODE_FLAG_POSIX_OPEN)) {
293 continue;
294 }
295 delete_file = False;
296 break;
297 }
298 }
299 }
300
301 /* Notify any deferred opens waiting on this close. */
302 notify_deferred_opens(lck);
303 reply_to_oplock_break_requests(fsp);
304
305 /*
306 * NT can set delete_on_close of the last open
307 * reference to a file.
308 */
309
310 if (!(close_type == NORMAL_CLOSE || close_type == SHUTDOWN_CLOSE)
311 || !delete_file
312 || (lck->delete_token == NULL)) {
313 TALLOC_FREE(lck);
314 return NT_STATUS_OK;
315 }
316
317 /*
318 * Ok, we have to delete the file
319 */
320
321 DEBUG(5,("close_remove_share_mode: file %s. Delete on close was set "
322 "- deleting file.\n", fsp->fsp_name));
323
324 /*
325 * Don't try to update the write time when we delete the file
326 */
327 fsp->update_write_time_on_close = false;
328
329 if (!unix_token_equal(lck->delete_token, &current_user.ut)) {
330 /* Become the user who requested the delete. */
331
332 DEBUG(5,("close_remove_share_mode: file %s. "
333 "Change user to uid %u\n",
334 fsp->fsp_name,
335 (unsigned int)lck->delete_token->uid));
336
337 if (!push_sec_ctx()) {
338 smb_panic("close_remove_share_mode: file %s. failed to push "
339 "sec_ctx.\n");
340 }
341
342 set_sec_ctx(lck->delete_token->uid,
343 lck->delete_token->gid,
344 lck->delete_token->ngroups,
345 lck->delete_token->groups,
346 NULL);
347
348 changed_user = true;
349 }
350
351 /* We can only delete the file if the name we have is still valid and
352 hasn't been renamed. */
353
354 if (fsp->posix_open) {
355 ret = SMB_VFS_LSTAT(conn,fsp->fsp_name,&sbuf);
356 } else {
357 ret = SMB_VFS_STAT(conn,fsp->fsp_name,&sbuf);
358 }
359
360 if (ret != 0) {
361 DEBUG(5,("close_remove_share_mode: file %s. Delete on close "
362 "was set and stat failed with error %s\n",
363 fsp->fsp_name, strerror(errno) ));
364 /*
365 * Don't save the errno here, we ignore this error
366 */
367 goto done;
368 }
369
370 id = vfs_file_id_from_sbuf(conn, &sbuf);
371
372 if (!file_id_equal(&fsp->file_id, &id)) {
373 DEBUG(5,("close_remove_share_mode: file %s. Delete on close "
374 "was set and dev and/or inode does not match\n",
375 fsp->fsp_name ));
376 DEBUG(5,("close_remove_share_mode: file %s. stored file_id %s, "
377 "stat file_id %s\n",
378 fsp->fsp_name,
379 file_id_string_tos(&fsp->file_id),
380 file_id_string_tos(&id)));
381 /*
382 * Don't save the errno here, we ignore this error
383 */
384 goto done;
385 }
386
387 if ((conn->fs_capabilities & FILE_NAMED_STREAMS)
388 && !is_ntfs_stream_name(fsp->fsp_name)) {
389
390 status = delete_all_streams(conn, fsp->fsp_name);
391
392 if (!NT_STATUS_IS_OK(status)) {
393 DEBUG(5, ("delete_all_streams failed: %s\n",
394 nt_errstr(status)));
395 goto done;
396 }
397 }
398
399
400 if (SMB_VFS_UNLINK(conn,fsp->fsp_name) != 0) {
401 /*
402 * This call can potentially fail as another smbd may
403 * have had the file open with delete on close set and
404 * deleted it when its last reference to this file
405 * went away. Hence we log this but not at debug level
406 * zero.
407 */
408
409 DEBUG(5,("close_remove_share_mode: file %s. Delete on close "
410 "was set and unlink failed with error %s\n",
411 fsp->fsp_name, strerror(errno) ));
412
413 status = map_nt_error_from_unix(errno);
414 }
415
416 notify_fname(conn, NOTIFY_ACTION_REMOVED,
417 FILE_NOTIFY_CHANGE_FILE_NAME,
418 fsp->fsp_name);
419
420 /* As we now have POSIX opens which can unlink
421 * with other open files we may have taken
422 * this code path with more than one share mode
423 * entry - ensure we only delete once by resetting
424 * the delete on close flag. JRA.
425 */
426
427 set_delete_on_close_lck(lck, False, NULL);
428
429 done:
430
431 if (changed_user) {
432 /* unbecome user. */
433 pop_sec_ctx();
434 }
435
436 TALLOC_FREE(lck);
437 return status;
438}
439
440void set_close_write_time(struct files_struct *fsp, struct timespec ts)
441{
442 DEBUG(6,("close_write_time: %s" , time_to_asc(convert_timespec_to_time_t(ts))));
443
444 if (null_timespec(ts)) {
445 return;
446 }
447 /*
448 * if the write time on close is explict set, then don't
449 * need to fix it up to the value in the locking db
450 */
451 fsp->write_time_forced = false;
452
453 fsp->update_write_time_on_close = true;
454 fsp->close_write_time = ts;
455}
456
457static NTSTATUS update_write_time_on_close(struct files_struct *fsp)
458{
459 SMB_STRUCT_STAT sbuf;
460 struct timespec ts[2];
461 NTSTATUS status;
462
463 ZERO_STRUCT(sbuf);
464 ZERO_STRUCT(ts);
465
466 if (!fsp->update_write_time_on_close) {
467 return NT_STATUS_OK;
468 }
469
470 if (null_timespec(fsp->close_write_time)) {
471 fsp->close_write_time = timespec_current();
472 }
473
474 /* Ensure we have a valid stat struct for the source. */
475 if (fsp->fh->fd != -1) {
476 if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
477 return map_nt_error_from_unix(errno);
478 }
479 } else {
480 if (SMB_VFS_STAT(fsp->conn,fsp->fsp_name,&sbuf) == -1) {
481 return map_nt_error_from_unix(errno);
482 }
483 }
484
485 if (!VALID_STAT(sbuf)) {
486 /* if it doesn't seem to be a real file */
487 return NT_STATUS_OK;
488 }
489
490 ts[1] = fsp->close_write_time;
491 status = smb_set_file_time(fsp->conn, fsp, fsp->fsp_name,
492 &sbuf, ts, true);
493 if (!NT_STATUS_IS_OK(status)) {
494 return status;
495 }
496
497 return NT_STATUS_OK;
498}
499
500/****************************************************************************
501 Close a file.
502
503 close_type can be NORMAL_CLOSE=0,SHUTDOWN_CLOSE,ERROR_CLOSE.
504 printing and magic scripts are only run on normal close.
505 delete on close is done on normal and shutdown close.
506****************************************************************************/
507
508static NTSTATUS close_normal_file(files_struct *fsp, enum file_close_type close_type)
509{
510 NTSTATUS status = NT_STATUS_OK;
511 NTSTATUS saved_status1 = NT_STATUS_OK;
512 NTSTATUS saved_status2 = NT_STATUS_OK;
513 NTSTATUS saved_status3 = NT_STATUS_OK;
514 NTSTATUS saved_status4 = NT_STATUS_OK;
515 connection_struct *conn = fsp->conn;
516
517 if (fsp->aio_write_behind) {
518 /*
519 * If we're finishing write behind on a close we can get a write
520 * error here, we must remember this.
521 */
522 int ret = wait_for_aio_completion(fsp);
523 if (ret) {
524 saved_status1 = map_nt_error_from_unix(ret);
525 }
526 } else {
527 cancel_aio_by_fsp(fsp);
528 }
529
530 /*
531 * If we're flushing on a close we can get a write
532 * error here, we must remember this.
533 */
534
535 saved_status2 = close_filestruct(fsp);
536
537 if (fsp->print_file) {
538 print_fsp_end(fsp, close_type);
539 file_free(fsp);
540 return NT_STATUS_OK;
541 }
542
543 /* If this is an old DOS or FCB open and we have multiple opens on
544 the same handle we only have one share mode. Ensure we only remove
545 the share mode on the last close. */
546
547 if (fsp->fh->ref_count == 1) {
548 /* Should we return on error here... ? */
549 saved_status3 = close_remove_share_mode(fsp, close_type);
550 }
551
552 if(fsp->oplock_type) {
553 release_file_oplock(fsp);
554 }
555
556 locking_close_file(smbd_messaging_context(), fsp);
557
558 status = fd_close(fsp);
559
560 /* check for magic scripts */
561 if (close_type == NORMAL_CLOSE) {
562 check_magic(fsp);
563 }
564
565 /*
566 * Ensure pending modtime is set after close.
567 */
568
569 saved_status4 = update_write_time_on_close(fsp);
570
571 if (NT_STATUS_IS_OK(status)) {
572 if (!NT_STATUS_IS_OK(saved_status1)) {
573 status = saved_status1;
574 } else if (!NT_STATUS_IS_OK(saved_status2)) {
575 status = saved_status2;
576 } else if (!NT_STATUS_IS_OK(saved_status3)) {
577 status = saved_status3;
578 } else if (!NT_STATUS_IS_OK(saved_status4)) {
579 status = saved_status4;
580 }
581 }
582
583 DEBUG(2,("%s closed file %s (numopen=%d) %s\n",
584 conn->user,fsp->fsp_name,
585 conn->num_files_open,
586 nt_errstr(status) ));
587
588 file_free(fsp);
589 return status;
590}
591
592/****************************************************************************
593 Close a directory opened by an NT SMB call.
594****************************************************************************/
595
596static NTSTATUS close_directory(files_struct *fsp, enum file_close_type close_type)
597{
598 struct share_mode_lock *lck = 0;
599 bool delete_dir = False;
600 NTSTATUS status = NT_STATUS_OK;
601
602 /*
603 * NT can set delete_on_close of the last open
604 * reference to a directory also.
605 */
606
607 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
608 NULL);
609
610 if (lck == NULL) {
611 DEBUG(0, ("close_directory: Could not get share mode lock for %s\n", fsp->fsp_name));
612 return NT_STATUS_INVALID_PARAMETER;
613 }
614
615 if (!del_share_mode(lck, fsp)) {
616 DEBUG(0, ("close_directory: Could not delete share entry for %s\n", fsp->fsp_name));
617 }
618
619 if (fsp->initial_delete_on_close) {
620 bool became_user = False;
621
622 /* Initial delete on close was set - for
623 * directories we don't care if anyone else
624 * wrote a real delete on close. */
625
626 if (current_user.vuid != fsp->vuid) {
627 become_user(fsp->conn, fsp->vuid);
628 became_user = True;
629 }
630 send_stat_cache_delete_message(fsp->fsp_name);
631 set_delete_on_close_lck(lck, True, &current_user.ut);
632 if (became_user) {
633 unbecome_user();
634 }
635 }
636
637 delete_dir = lck->delete_on_close;
638
639 if (delete_dir) {
640 int i;
641 /* See if others still have the dir open. If this is the
642 * case, then don't delete. If all opens are POSIX delete now. */
643 for (i=0; i<lck->num_share_modes; i++) {
644 struct share_mode_entry *e = &lck->share_modes[i];
645 if (is_valid_share_mode_entry(e)) {
646 if (fsp->posix_open && (e->flags & SHARE_MODE_FLAG_POSIX_OPEN)) {
647 continue;
648 }
649 delete_dir = False;
650 break;
651 }
652 }
653 }
654
655 if ((close_type == NORMAL_CLOSE || close_type == SHUTDOWN_CLOSE) &&
656 delete_dir &&
657 lck->delete_token) {
658
659 /* Become the user who requested the delete. */
660
661 if (!push_sec_ctx()) {
662 smb_panic("close_directory: failed to push sec_ctx.\n");
663 }
664
665 set_sec_ctx(lck->delete_token->uid,
666 lck->delete_token->gid,
667 lck->delete_token->ngroups,
668 lck->delete_token->groups,
669 NULL);
670
671 TALLOC_FREE(lck);
672
673 status = rmdir_internals(talloc_tos(),
674 fsp->conn, fsp->fsp_name);
675
676 DEBUG(5,("close_directory: %s. Delete on close was set - "
677 "deleting directory returned %s.\n",
678 fsp->fsp_name, nt_errstr(status)));
679
680 /* unbecome user. */
681 pop_sec_ctx();
682
683 /*
684 * Ensure we remove any change notify requests that would
685 * now fail as the directory has been deleted.
686 */
687
688 if(NT_STATUS_IS_OK(status)) {
689 remove_pending_change_notify_requests_by_fid(fsp, NT_STATUS_DELETE_PENDING);
690 }
691 } else {
692 TALLOC_FREE(lck);
693 remove_pending_change_notify_requests_by_fid(
694 fsp, NT_STATUS_OK);
695 }
696
697 /*
698 * Do the code common to files and directories.
699 */
700 close_filestruct(fsp);
701 file_free(fsp);
702 return status;
703}
704
705/****************************************************************************
706 Close a 'stat file' opened internally.
707****************************************************************************/
708
709static NTSTATUS close_stat(files_struct *fsp)
710{
711 /*
712 * Do the code common to files and directories.
713 */
714 close_filestruct(fsp);
715 file_free(fsp);
716 return NT_STATUS_OK;
717}
718
719/****************************************************************************
720 Close a files_struct.
721****************************************************************************/
722
723NTSTATUS close_file(files_struct *fsp, enum file_close_type close_type)
724{
725 NTSTATUS status;
726 struct files_struct *base_fsp = fsp->base_fsp;
727
728 if(fsp->is_directory) {
729 status = close_directory(fsp, close_type);
730 } else if (fsp->is_stat) {
731 status = close_stat(fsp);
732 } else if (fsp->fake_file_handle != NULL) {
733 status = close_fake_file(fsp);
734 } else {
735 status = close_normal_file(fsp, close_type);
736 }
737
738 if ((base_fsp != NULL) && (close_type != SHUTDOWN_CLOSE)) {
739
740 /*
741 * fsp was a stream, the base fsp can't be a stream as well
742 *
743 * For SHUTDOWN_CLOSE this is not possible here, because
744 * SHUTDOWN_CLOSE only happens from files.c which walks the
745 * complete list of files. If we mess with more than one fsp
746 * those loops will become confused.
747 */
748
749 SMB_ASSERT(base_fsp->base_fsp == NULL);
750 close_file(base_fsp, close_type);
751 }
752
753 return status;
754}
755
756/****************************************************************************
757 Deal with an (authorized) message to close a file given the share mode
758 entry.
759****************************************************************************/
760
761void msg_close_file(struct messaging_context *msg_ctx,
762 void *private_data,
763 uint32_t msg_type,
764 struct server_id server_id,
765 DATA_BLOB *data)
766{
767 files_struct *fsp = NULL;
768 struct share_mode_entry e;
769
770 message_to_share_mode_entry(&e, (char *)data->data);
771
772 if(DEBUGLVL(10)) {
773 char *sm_str = share_mode_str(NULL, 0, &e);
774 if (!sm_str) {
775 smb_panic("talloc failed");
776 }
777 DEBUG(10,("msg_close_file: got request to close share mode "
778 "entry %s\n", sm_str));
779 TALLOC_FREE(sm_str);
780 }
781
782 fsp = file_find_dif(e.id, e.share_file_id);
783 if (!fsp) {
784 DEBUG(10,("msg_close_file: failed to find file.\n"));
785 return;
786 }
787 close_file(fsp, NORMAL_CLOSE);
788}
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