summaryrefslogtreecommitdiff
path: root/source3/smbd/vfs-wrap.c
blob: 15d9572d1dbe8b0f123967442e627e4c75cd5f6a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
/* 
   Unix SMB/CIFS implementation.
   Wrap disk only vfs functions to sidestep dodgy compilers.
   Copyright (C) Tim Potter 1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/* Check for NULL pointer parameters in vfswrap_* functions */

#define VFS_CHECK_NULL

/* We don't want to have NULL function pointers lying around.  Someone
   is sure to try and execute them.  These stubs are used to prevent
   this possibility. */

int vfswrap_dummy_connect(connection_struct *conn, const char *service, const char *user)
{
    return 0;    /* Return >= 0 for success */
}

void vfswrap_dummy_disconnect(connection_struct *conn)
{
}

/* Disk operations */

SMB_BIG_UINT vfswrap_disk_free(connection_struct *conn, const char *path, BOOL small_query, SMB_BIG_UINT *bsize, 
			       SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize)
{
    SMB_BIG_UINT result;

#ifdef VFS_CHECK_NULL
    if ((path == NULL) || (bsize == NULL) || (dfree == NULL) ||
	(dsize == NULL)) {
	
	smb_panic("NULL pointer passed to vfswrap_disk_free() function\n");
    }
#endif

    result = sys_disk_free(path, small_query, bsize, dfree, dsize);
    return result;
}
    
/* Directory operations */

DIR *vfswrap_opendir(connection_struct *conn, const char *fname)
{
    DIR *result;

    START_PROFILE(syscall_opendir);

#ifdef VFS_CHECK_NULL
    if (fname == NULL) {
	smb_panic("NULL pointer passed to vfswrap_opendir()\n");
    }
#endif

    result = opendir(fname);
    END_PROFILE(syscall_opendir);
    return result;
}

struct dirent *vfswrap_readdir(connection_struct *conn, DIR *dirp)
{
    struct dirent *result;

    START_PROFILE(syscall_readdir);

#ifdef VFS_CHECK_NULL
    if (dirp == NULL) {
	smb_panic("NULL pointer passed to vfswrap_readdir()\n");
    }
#endif

    result = readdir(dirp);
    END_PROFILE(syscall_readdir);
    return result;
}

int vfswrap_mkdir(connection_struct *conn, const char *path, mode_t mode)
{
    int result;

    START_PROFILE(syscall_mkdir);

#ifdef VFS_CHECK_NULL
    if (path == NULL) {
	smb_panic("NULL pointer passed to vfswrap_mkdir()\n");
    }
#endif

    result = mkdir(path, mode);

	if (result == 0) {
		/*
		 * We need to do this as the default behavior of POSIX ACLs	
		 * is to set the mask to be the requested group permission
		 * bits, not the group permission bits to be the requested
		 * group permission bits. This is not what we want, as it will
		 * mess up any inherited ACL bits that were set. JRA.
		 */
		int saved_errno = errno; /* We may get ENOSYS */
		if (conn->vfs_ops.chmod_acl != NULL) {
			if ((conn->vfs_ops.chmod_acl(conn, path, mode) == -1) && (errno == ENOSYS))
				errno = saved_errno;
		}
	}

    END_PROFILE(syscall_mkdir);
    return result;
}

int vfswrap_rmdir(connection_struct *conn, const char *path)
{
    int result;

    START_PROFILE(syscall_rmdir);

#ifdef VFS_CHECK_NULL
    if (path == NULL) {
	smb_panic("NULL pointer passed to vfswrap_rmdir()\n");
    }
#endif

    result = rmdir(path);
    END_PROFILE(syscall_rmdir);
    return result;
}

int vfswrap_closedir(connection_struct *conn, DIR *dirp)
{
    int result;

    START_PROFILE(syscall_closedir);

#ifdef VFS_CHECK_NULL
    if (dirp == NULL) {
	smb_panic("NULL pointer passed to vfswrap_closedir()\n");
    }
#endif

    result = closedir(dirp);
    END_PROFILE(syscall_closedir);
    return result;
}

/* File operations */
    
int vfswrap_open(connection_struct *conn, const char *fname, int flags, mode_t mode)
{
    int result;

    START_PROFILE(syscall_open);

#ifdef VFS_CHECK_NULL
    if (fname == NULL) {
	smb_panic("NULL pointer passed to vfswrap_open()\n");
    }
#endif

    result = sys_open(fname, flags, mode);
    END_PROFILE(syscall_open);
    return result;
}

int vfswrap_close(files_struct *fsp, int fd)
{
    int result;

    START_PROFILE(syscall_close);

    result = close(fd);
    END_PROFILE(syscall_close);
    return result;
}

ssize_t vfswrap_read(files_struct *fsp, int fd, void *data, size_t n)
{
    ssize_t result;

    START_PROFILE_BYTES(syscall_read, n);

#ifdef VFS_CHECK_NULL
    if (data == NULL) {
	smb_panic("NULL pointer passed to vfswrap_read()\n");
    }
#endif

    result = read(fd, data, n);
    END_PROFILE(syscall_read);
    return result;
}

ssize_t vfswrap_write(files_struct *fsp, int fd, const void *data, size_t n)
{
    ssize_t result;

    START_PROFILE_BYTES(syscall_write, n);

#ifdef VFS_CHECK_NULL
    if (data == NULL) {
	smb_panic("NULL pointer passed to vfswrap_write()\n");
    }
#endif

    result = write(fd, data, n);
    END_PROFILE(syscall_write);
    return result;
}

SMB_OFF_T vfswrap_lseek(files_struct *fsp, int filedes, SMB_OFF_T offset, int whence)
{
    SMB_OFF_T result;

    START_PROFILE(syscall_lseek);

    result = sys_lseek(filedes, offset, whence);
    END_PROFILE(syscall_lseek);
    return result;
}

int vfswrap_rename(connection_struct *conn, const char *old, const char *new)
{
    int result;

    START_PROFILE(syscall_rename);

#ifdef VFS_CHECK_NULL
    if ((old == NULL) || (new == NULL)) {
	smb_panic("NULL pointer passed to vfswrap_rename()\n");
    }
#endif

    result = rename(old, new);
    END_PROFILE(syscall_rename);
    return result;
}

int vfswrap_fsync(files_struct *fsp, int fd)
{
#ifdef HAVE_FSYNC
    int result;

    START_PROFILE(syscall_fsync);

    result = fsync(fd);
    END_PROFILE(syscall_fsync);
    return result;
#else
	return 0;
#endif
}

int vfswrap_stat(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *sbuf)
{
    int result;

    START_PROFILE(syscall_stat);

#ifdef VFS_CHECK_NULL
    if ((fname == NULL) || (sbuf == NULL)) {
	smb_panic("NULL pointer passed to vfswrap_stat()\n");
    }
#endif

    result = sys_stat(fname, sbuf);
    END_PROFILE(syscall_stat);
    return result;
}

int vfswrap_fstat(files_struct *fsp, int fd, SMB_STRUCT_STAT *sbuf)
{
    int result;

    START_PROFILE(syscall_fstat);

#ifdef VFS_CHECK_NULL
    if (sbuf == NULL) {
	smb_panic("NULL pointer passed to vfswrap_fstat()\n");
    }
#endif

    result = sys_fstat(fd, sbuf);
    END_PROFILE(syscall_fstat);
    return result;
}

int vfswrap_lstat(connection_struct *conn, const char *path, SMB_STRUCT_STAT *sbuf)
{
    int result;

    START_PROFILE(syscall_lstat);

#ifdef VFS_CHECK_NULL
    if ((path == NULL) || (sbuf == NULL)) {
	smb_panic("NULL pointer passed to vfswrap_lstat()\n");
    }
#endif

    result = sys_lstat(path, sbuf);
    END_PROFILE(syscall_lstat);
    return result;
}

int vfswrap_unlink(connection_struct *conn, const char *path)
{
    int result;

    START_PROFILE(syscall_unlink);

#ifdef VFS_CHECK_NULL
    if (path == NULL) {
	smb_panic("NULL pointer passed to vfswrap_unlink()\n");
    }
#endif

    result = unlink(path);
    END_PROFILE(syscall_unlink);
    return result;
}

int vfswrap_chmod(connection_struct *conn, const char *path, mode_t mode)
{
    int result;

    START_PROFILE(syscall_chmod);

#ifdef VFS_CHECK_NULL
    if (path == NULL) {
	smb_panic("NULL pointer passed to vfswrap_chmod()\n");
    }
#endif

	/*
	 * We need to do this due to the fact that the default POSIX ACL
	 * chmod modifies the ACL *mask* for the group owner, not the
	 * group owner bits directly. JRA.
	 */

	
	if (conn->vfs_ops.chmod_acl != NULL) {
		int saved_errno = errno; /* We might get ENOSYS */
		if ((result = conn->vfs_ops.chmod_acl(conn, path, mode)) == 0) {
			END_PROFILE(syscall_chmod);
			return result;
		}
		/* Error - return the old errno. */
		errno = saved_errno;
	}

    result = chmod(path, mode);
    END_PROFILE(syscall_chmod);
    return result;
}

int vfswrap_fchmod(files_struct *fsp, int fd, mode_t mode)
{
    int result;
	struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops;
	
    START_PROFILE(syscall_fchmod);

	/*
	 * We need to do this due to the fact that the default POSIX ACL
	 * chmod modifies the ACL *mask* for the group owner, not the
	 * group owner bits directly. JRA.
	 */
	
	if (vfs_ops->fchmod_acl != NULL) {
		int saved_errno = errno; /* We might get ENOSYS */
		if ((result = vfs_ops->fchmod_acl(fsp, fd, mode)) == 0) {
			END_PROFILE(syscall_chmod);
			return result;
		}
		/* Error - return the old errno. */
		errno = saved_errno;
	}

    result = fchmod(fd, mode);
    END_PROFILE(syscall_fchmod);
    return result;
}

int vfswrap_chown(connection_struct *conn, const char *path, uid_t uid, gid_t gid)
{
    int result;

    START_PROFILE(syscall_chown);

#ifdef VFS_CHECK_NULL
    if (path == NULL) {
	smb_panic("NULL pointer passed to vfswrap_chown()\n");
    }
#endif

    result = sys_chown(path, uid, gid);
    END_PROFILE(syscall_chown);
    return result;
}

int vfswrap_fchown(files_struct *fsp, int fd, uid_t uid, gid_t gid)
{
    int result;

    START_PROFILE(syscall_fchown);

    result = fchown(fd, uid, gid);
    END_PROFILE(syscall_fchown);
    return result;
}

int vfswrap_chdir(connection_struct *conn, const char *path)
{
    int result;

    START_PROFILE(syscall_chdir);

#ifdef VFS_CHECK_NULL
    if (path == NULL) {
	smb_panic("NULL pointer passed to vfswrap_chdir()\n");
    }
#endif

    result = chdir(path);
    END_PROFILE(syscall_chdir);
    return result;
}

char *vfswrap_getwd(connection_struct *conn, char *path)
{
    char *result;

    START_PROFILE(syscall_getwd);

#ifdef VFS_CHECK_NULL
    if (path == NULL) {
	smb_panic("NULL pointer passed to vfswrap_getwd()\n");
    }
#endif

    result = sys_getwd(path);
    END_PROFILE(syscall_getwd);
    return result;
}

int vfswrap_utime(connection_struct *conn, const char *path, struct utimbuf *times)
{
    int result;

    START_PROFILE(syscall_utime);

#ifdef VFS_CHECK_NULL
    if ((path == NULL) || (times == NULL)) {
	smb_panic("NULL pointer passed to vfswrap_utime()\n");
    }
#endif

    result = utime(path, times);
    END_PROFILE(syscall_utime);
    return result;
}

/*********************************************************************
 A version of ftruncate that will write the space on disk if strict
 allocate is set.
**********************************************************************/

static int strict_allocate_ftruncate(files_struct *fsp, int fd, SMB_OFF_T len)
{
	struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops;
	SMB_STRUCT_STAT st;
	SMB_OFF_T currpos = vfs_ops->lseek(fsp, fd, 0, SEEK_CUR);
	unsigned char zero_space[4096];
	SMB_OFF_T space_to_write;

	if (currpos == -1)
		return -1;

	if (vfs_ops->fstat(fsp, fd, &st) == -1)
		return -1;

	space_to_write = len - st.st_size;

#ifdef S_ISFIFO
	if (S_ISFIFO(st.st_mode))
		return 0;
#endif

	if (st.st_size == len)
		return 0;

	/* Shrink - just ftruncate. */
	if (st.st_size > len)
		return sys_ftruncate(fd, len);

	/* Write out the real space on disk. */
	if (vfs_ops->lseek(fsp, fd, st.st_size, SEEK_SET) != st.st_size)
		return -1;

	space_to_write = len - st.st_size;

	memset(zero_space, '\0', sizeof(zero_space));
	while ( space_to_write > 0) {
		SMB_OFF_T retlen;
		SMB_OFF_T current_len_to_write = MIN(sizeof(zero_space),space_to_write);

		retlen = vfs_ops->write(fsp,fsp->fd,(char *)zero_space,current_len_to_write);
		if (retlen <= 0)
			return -1;

		space_to_write -= retlen;
	}

	/* Seek to where we were */
	if (vfs_ops->lseek(fsp, fd, currpos, SEEK_SET) != currpos)
		return -1;

	return 0;
}

int vfswrap_ftruncate(files_struct *fsp, int fd, SMB_OFF_T len)
{
	int result = -1;
	struct vfs_ops *vfs_ops = &fsp->conn->vfs_ops;
	SMB_STRUCT_STAT st;
	char c = 0;
	SMB_OFF_T currpos;

	START_PROFILE(syscall_ftruncate);

	if (lp_strict_allocate(SNUM(fsp->conn))) {
		result = strict_allocate_ftruncate(fsp, fd, len);
		END_PROFILE(syscall_ftruncate);
		return result;
	}

	/* we used to just check HAVE_FTRUNCATE_EXTEND and only use
	   sys_ftruncate if the system supports it. Then I discovered that
	   you can have some filesystems that support ftruncate
	   expansion and some that don't! On Linux fat can't do
	   ftruncate extend but ext2 can. */

	result = sys_ftruncate(fd, len);
	if (result == 0)
		goto done;

	/* According to W. R. Stevens advanced UNIX prog. Pure 4.3 BSD cannot
	   extend a file with ftruncate. Provide alternate implementation
	   for this */
	currpos = vfs_ops->lseek(fsp, fd, 0, SEEK_CUR);
	if (currpos == -1) {
		goto done;
	}

	/* Do an fstat to see if the file is longer than the requested
	   size in which case the ftruncate above should have
	   succeeded or shorter, in which case seek to len - 1 and
	   write 1 byte of zero */
	if (vfs_ops->fstat(fsp, fd, &st) == -1) {
		goto done;
	}

#ifdef S_ISFIFO
	if (S_ISFIFO(st.st_mode)) {
		result = 0;
		goto done;
	}
#endif

	if (st.st_size == len) {
		result = 0;
		goto done;
	}

	if (st.st_size > len) {
		/* the sys_ftruncate should have worked */
		goto done;
	}

	if (vfs_ops->lseek(fsp, fd, len-1, SEEK_SET) != len -1)
		goto done;

	if (vfs_ops->write(fsp, fd, &c, 1)!=1)
		goto done;

	/* Seek to where we were */
	if (vfs_ops->lseek(fsp, fd, currpos, SEEK_SET) != currpos)
		goto done;
	result = 0;

  done:

	END_PROFILE(syscall_ftruncate);
	return result;
}

BOOL vfswrap_lock(files_struct *fsp, int fd, int op, SMB_OFF_T offset, SMB_OFF_T count, int type)
{
    BOOL result;

    START_PROFILE(syscall_fcntl_lock);

    result =  fcntl_lock(fd, op, offset, count,type);
    END_PROFILE(syscall_fcntl_lock);
    return result;
}

int vfswrap_symlink(connection_struct *conn, const char *oldpath, const char *newpath)
{
    int result;

    START_PROFILE(syscall_symlink);

#ifdef VFS_CHECK_NULL
    if ((oldpath == NULL) || (newpath == NULL))
		smb_panic("NULL pointer passed to vfswrap_symlink()\n");
#endif

    result = sys_symlink(oldpath, newpath);
    END_PROFILE(syscall_symlink);
    return result;
}

int vfswrap_readlink(connection_struct *conn, const char *path, char *buf, size_t bufsiz)
{
    int result;

    START_PROFILE(syscall_readlink);

#ifdef VFS_CHECK_NULL
    if ((path == NULL) || (buf == NULL))
		smb_panic("NULL pointer passed to vfswrap_readlink()\n");
#endif

    result = sys_readlink(path, buf, bufsiz);
    END_PROFILE(syscall_readlink);
    return result;
}

int vfswrap_link(connection_struct *conn, const char *oldpath, const char *newpath)
{
	int result;

	START_PROFILE(syscall_link);

#ifdef VFS_CHECK_NULL
	if ((oldpath == NULL) || (newpath == NULL))
                smb_panic("NULL pointer passed to vfswrap_link()\n");
#endif
	result = sys_link(oldpath, newpath);
	END_PROFILE(syscall_link);
	return result;
}

int vfswrap_mknod(connection_struct *conn, const char *pathname, mode_t mode, SMB_DEV_T dev)
{
	int result;

	START_PROFILE(syscall_mknod);

#ifdef VFS_CHECK_NULL
	if (pathname == NULL)
                smb_panic("NULL pointer passed to vfswrap_mknod()\n");
#endif
	result = sys_mknod(pathname, mode, dev);
	END_PROFILE(syscall_mknod);
	return result;
}

size_t vfswrap_fget_nt_acl(files_struct *fsp, int fd, SEC_DESC **ppdesc)
{
	size_t result;

	START_PROFILE(fget_nt_acl);
	result = get_nt_acl(fsp, ppdesc);
	END_PROFILE(fget_nt_acl);
	return result;
}

size_t vfswrap_get_nt_acl(files_struct *fsp, const char *name, SEC_DESC **ppdesc)
{
	size_t result;

	START_PROFILE(get_nt_acl);
	result = get_nt_acl(fsp, ppdesc);
	END_PROFILE(get_nt_acl);
	return result;
}

BOOL vfswrap_fset_nt_acl(files_struct *fsp, int fd, uint32 security_info_sent, SEC_DESC *psd)
{
	BOOL result;

	START_PROFILE(fset_nt_acl);
	result = set_nt_acl(fsp, security_info_sent, psd);
	END_PROFILE(fset_nt_acl);
	return result;
}

BOOL vfswrap_set_nt_acl(files_struct *fsp, const char *name, uint32 security_info_sent, SEC_DESC *psd)
{
	BOOL result;

	START_PROFILE(set_nt_acl);
	result = set_nt_acl(fsp, security_info_sent, psd);
	END_PROFILE(set_nt_acl);
	return result;
}

int vfswrap_chmod_acl(connection_struct *conn, const char *name, mode_t mode)
{
	int result;

	START_PROFILE(chmod_acl);
	result = chmod_acl(name, mode);
	END_PROFILE(chmod_acl);
	return result;
}

int vfswrap_fchmod_acl(files_struct *fsp, int fd, mode_t mode)
{
	int result;

	START_PROFILE(fchmod_acl);
	result = fchmod_acl(fd, mode);
	END_PROFILE(fchmod_acl);
	return result;
}