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
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
|
/*
Unix SMB/CIFS implementation.
Samba system utilities
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 1998-2005
Copyright (C) Timur Bakeyev 2005
Copyright (C) Bjoern Jacke 2006-2007
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/syslog.h"
#include "system/capability.h"
#include "system/passwd.h"
#include "system/filesys.h"
#include "lib/util/setid.h"
#include "lib/util/time.h"
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
/*
The idea is that this file will eventually have wrappers around all
important system calls in samba. The aims are:
- to enable easier porting by putting OS dependent stuff in here
- to allow for hooks into other "pseudo-filesystems"
- to allow easier integration of things like the japanese extensions
- to support the philosophy of Samba to expose the features of
the OS within the SMB model. In general whatever file/printer/variable
expansions/etc make sense to the OS should be acceptable to Samba.
*/
/*******************************************************************
A send wrapper that will deal with EINTR or EAGAIN or EWOULDBLOCK.
********************************************************************/
ssize_t sys_send(int s, const void *msg, size_t len, int flags)
{
ssize_t ret;
do {
ret = send(s, msg, len, flags);
} while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
return ret;
}
/*******************************************************************
A recvfrom wrapper that will deal with EINTR.
NB. As used with non-blocking sockets, return on EAGAIN/EWOULDBLOCK
********************************************************************/
ssize_t sys_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
{
ssize_t ret;
do {
ret = recvfrom(s, buf, len, flags, from, fromlen);
} while (ret == -1 && (errno == EINTR));
return ret;
}
/*******************************************************************
A fcntl wrapper that will deal with EINTR.
********************************************************************/
int sys_fcntl_ptr(int fd, int cmd, void *arg)
{
int ret;
do {
ret = fcntl(fd, cmd, arg);
} while (ret == -1 && errno == EINTR);
return ret;
}
/*******************************************************************
A fcntl wrapper that will deal with EINTR.
********************************************************************/
int sys_fcntl_long(int fd, int cmd, long arg)
{
int ret;
do {
ret = fcntl(fd, cmd, arg);
} while (ret == -1 && errno == EINTR);
return ret;
}
/*******************************************************************
A fcntl wrapper that will deal with EINTR.
********************************************************************/
int sys_fcntl_int(int fd, int cmd, int arg)
{
int ret;
do {
ret = fcntl(fd, cmd, arg);
} while (ret == -1 && errno == EINTR);
return ret;
}
/****************************************************************************
Return the best approximation to a 'create time' under UNIX from a stat
structure.
****************************************************************************/
static struct timespec calc_create_time_stat(const struct stat *st)
{
struct timespec ret, ret1;
struct timespec c_time = get_ctimespec(st);
struct timespec m_time = get_mtimespec(st);
struct timespec a_time = get_atimespec(st);
ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
if(!null_timespec(ret1)) {
return ret1;
}
/*
* One of ctime, mtime or atime was zero (probably atime).
* Just return MIN(ctime, mtime).
*/
return ret;
}
/****************************************************************************
Return the best approximation to a 'create time' under UNIX from a stat_ex
structure.
****************************************************************************/
static struct timespec calc_create_time_stat_ex(const struct stat_ex *st)
{
struct timespec ret, ret1;
struct timespec c_time = st->st_ex_ctime;
struct timespec m_time = st->st_ex_mtime;
struct timespec a_time = st->st_ex_atime;
ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
if(!null_timespec(ret1)) {
return ret1;
}
/*
* One of ctime, mtime or atime was zero (probably atime).
* Just return MIN(ctime, mtime).
*/
return ret;
}
/****************************************************************************
Return the 'create time' from a stat struct if it exists (birthtime) or else
use the best approximation.
****************************************************************************/
static void make_create_timespec(const struct stat *pst, struct stat_ex *dst,
bool fake_dir_create_times)
{
if (S_ISDIR(pst->st_mode) && fake_dir_create_times) {
dst->st_ex_btime.tv_sec = 315493200L; /* 1/1/1980 */
dst->st_ex_btime.tv_nsec = 0;
}
dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
#if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC)
dst->st_ex_btime = pst->st_birthtimespec;
#elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
dst->st_ex_btime.tv_sec = pst->st_birthtime;
dst->st_ex_btime.tv_nsec = pst->st_birthtimenspec;
#elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIME)
dst->st_ex_btime.tv_sec = pst->st_birthtime;
dst->st_ex_btime.tv_nsec = 0;
#else
dst->st_ex_btime = calc_create_time_stat(pst);
dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
#endif
/* Deal with systems that don't initialize birthtime correctly.
* Pointed out by SATOH Fumiyasu <fumiyas@osstech.jp>.
*/
if (null_timespec(dst->st_ex_btime)) {
dst->st_ex_btime = calc_create_time_stat(pst);
dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
}
}
/****************************************************************************
If we update a timestamp in a stat_ex struct we may have to recalculate
the birthtime. For now only implement this for write time, but we may
also need to do it for atime and ctime. JRA.
****************************************************************************/
void update_stat_ex_mtime(struct stat_ex *dst,
struct timespec write_ts)
{
dst->st_ex_mtime = write_ts;
/* We may have to recalculate btime. */
if (dst->st_ex_iflags & ST_EX_IFLAG_CALCULATED_BTIME) {
dst->st_ex_btime = calc_create_time_stat_ex(dst);
}
}
void update_stat_ex_create_time(struct stat_ex *dst,
struct timespec create_time)
{
dst->st_ex_btime = create_time;
dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
}
void update_stat_ex_from_saved_stat(struct stat_ex *dst,
const struct stat_ex *src)
{
if (!VALID_STAT(*src)) {
return;
}
if (!(src->st_ex_iflags & ST_EX_IFLAG_CALCULATED_BTIME)) {
update_stat_ex_create_time(dst, src->st_ex_btime);
}
}
void init_stat_ex_from_stat (struct stat_ex *dst,
const struct stat *src,
bool fake_dir_create_times)
{
dst->st_ex_dev = src->st_dev;
dst->st_ex_ino = src->st_ino;
dst->st_ex_mode = src->st_mode;
dst->st_ex_nlink = src->st_nlink;
dst->st_ex_uid = src->st_uid;
dst->st_ex_gid = src->st_gid;
dst->st_ex_rdev = src->st_rdev;
dst->st_ex_size = src->st_size;
dst->st_ex_atime = get_atimespec(src);
dst->st_ex_mtime = get_mtimespec(src);
dst->st_ex_ctime = get_ctimespec(src);
dst->st_ex_iflags = 0;
make_create_timespec(src, dst, fake_dir_create_times);
#ifdef HAVE_STAT_ST_BLKSIZE
dst->st_ex_blksize = src->st_blksize;
#else
dst->st_ex_blksize = STAT_ST_BLOCKSIZE;
#endif
#ifdef HAVE_STAT_ST_BLOCKS
dst->st_ex_blocks = src->st_blocks;
#else
dst->st_ex_blocks = src->st_size / dst->st_ex_blksize + 1;
#endif
#ifdef HAVE_STAT_ST_FLAGS
dst->st_ex_flags = src->st_flags;
#else
dst->st_ex_flags = 0;
#endif
}
/*******************************************************************
A stat() wrapper.
********************************************************************/
int sys_stat(const char *fname, SMB_STRUCT_STAT *sbuf,
bool fake_dir_create_times)
{
int ret;
struct stat statbuf;
ret = stat(fname, &statbuf);
if (ret == 0) {
/* we always want directories to appear zero size */
if (S_ISDIR(statbuf.st_mode)) {
statbuf.st_size = 0;
}
init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
}
return ret;
}
/*******************************************************************
An fstat() wrapper.
********************************************************************/
int sys_fstat(int fd, SMB_STRUCT_STAT *sbuf, bool fake_dir_create_times)
{
int ret;
struct stat statbuf;
ret = fstat(fd, &statbuf);
if (ret == 0) {
/* we always want directories to appear zero size */
if (S_ISDIR(statbuf.st_mode)) {
statbuf.st_size = 0;
}
init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
}
return ret;
}
/*******************************************************************
An lstat() wrapper.
********************************************************************/
int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf,
bool fake_dir_create_times)
{
int ret;
struct stat statbuf;
ret = lstat(fname, &statbuf);
if (ret == 0) {
/* we always want directories to appear zero size */
if (S_ISDIR(statbuf.st_mode)) {
statbuf.st_size = 0;
}
init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
}
return ret;
}
/*******************************************************************
An fstatat() wrapper.
********************************************************************/
int sys_fstatat(int fd,
const char *pathname,
SMB_STRUCT_STAT *sbuf,
int flags,
bool fake_dir_create_times)
{
int ret;
struct stat statbuf;
ret = fstatat(fd, pathname, &statbuf, flags);
if (ret != 0) {
return -1;
}
/* we always want directories to appear zero size */
if (S_ISDIR(statbuf.st_mode)) {
statbuf.st_size = 0;
}
init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
return 0;
}
/*******************************************************************
An posix_fallocate() wrapper.
********************************************************************/
int sys_posix_fallocate(int fd, off_t offset, off_t len)
{
#if defined(HAVE_POSIX_FALLOCATE)
return posix_fallocate(fd, offset, len);
#elif defined(F_RESVSP64)
/* this handles XFS on IRIX */
struct flock64 fl;
off_t new_len = offset + len;
int ret;
struct stat64 sbuf;
/* unlikely to get a too large file on a 64bit system but ... */
if (new_len < 0)
return EFBIG;
fl.l_whence = SEEK_SET;
fl.l_start = offset;
fl.l_len = len;
ret=fcntl(fd, F_RESVSP64, &fl);
if (ret != 0)
return errno;
/* Make sure the file gets enlarged after we allocated space: */
fstat64(fd, &sbuf);
if (new_len > sbuf.st_size)
ftruncate64(fd, new_len);
return 0;
#else
return ENOSYS;
#endif
}
/*******************************************************************
An fallocate() function that matches the semantics of the Linux one.
********************************************************************/
#ifdef HAVE_LINUX_FALLOC_H
#include <linux/falloc.h>
#endif
int sys_fallocate(int fd, uint32_t mode, off_t offset, off_t len)
{
#if defined(HAVE_LINUX_FALLOCATE)
int lmode = 0;
if (mode & VFS_FALLOCATE_FL_KEEP_SIZE) {
lmode |= FALLOC_FL_KEEP_SIZE;
mode &= ~VFS_FALLOCATE_FL_KEEP_SIZE;
}
#if defined(HAVE_FALLOC_FL_PUNCH_HOLE)
if (mode & VFS_FALLOCATE_FL_PUNCH_HOLE) {
lmode |= FALLOC_FL_PUNCH_HOLE;
mode &= ~VFS_FALLOCATE_FL_PUNCH_HOLE;
}
#endif /* HAVE_FALLOC_FL_PUNCH_HOLE */
if (mode != 0) {
DEBUG(2, ("unmapped fallocate flags: %lx\n",
(unsigned long)mode));
errno = EINVAL;
return -1;
}
return fallocate(fd, lmode, offset, len);
#else /* HAVE_LINUX_FALLOCATE */
/* TODO - plumb in fallocate from other filesysetms like VXFS etc. JRA. */
errno = ENOSYS;
return -1;
#endif /* HAVE_LINUX_FALLOCATE */
}
/*******************************************************************
An fdopendir wrapper.
********************************************************************/
DIR *sys_fdopendir(int fd)
{
#if defined(HAVE_FDOPENDIR)
return fdopendir(fd);
#else
errno = ENOSYS;
return NULL;
#endif
}
/*******************************************************************
An mknod() wrapper.
********************************************************************/
int sys_mknod(const char *path, mode_t mode, SMB_DEV_T dev)
{
#if defined(HAVE_MKNOD)
return mknod(path, mode, dev);
#else
/* No mknod system call. */
errno = ENOSYS;
return -1;
#endif
}
/*******************************************************************
A mknodat() wrapper.
********************************************************************/
int sys_mknodat(int dirfd, const char *path, mode_t mode, SMB_DEV_T dev)
{
#if defined(HAVE_MKNODAT)
return mknodat(dirfd, path, mode, dev);
#else
/* No mknod system call. */
errno = ENOSYS;
return -1;
#endif
}
/*******************************************************************
System wrapper for getwd. Always returns MALLOC'ed memory, or NULL
on error (malloc fail usually).
********************************************************************/
char *sys_getwd(void)
{
#ifdef GETCWD_TAKES_NULL
return getcwd(NULL, 0);
#elif defined(HAVE_GETCWD)
char *wd = NULL, *s = NULL;
size_t allocated = PATH_MAX;
while (1) {
s = SMB_REALLOC_ARRAY(s, char, allocated);
if (s == NULL) {
return NULL;
}
wd = getcwd(s, allocated);
if (wd) {
break;
}
if (errno != ERANGE) {
int saved_errno = errno;
SAFE_FREE(s);
errno = saved_errno;
break;
}
allocated *= 2;
if (allocated < PATH_MAX) {
SAFE_FREE(s);
break;
}
}
return wd;
#else
char *wd = NULL;
char *s = SMB_MALLOC_ARRAY(char, PATH_MAX);
if (s == NULL) {
return NULL;
}
wd = getwd(s);
if (wd == NULL) {
int saved_errno = errno;
SAFE_FREE(s);
errno = saved_errno;
}
return wd;
#endif
}
#if defined(HAVE_POSIX_CAPABILITIES)
/**************************************************************************
Try and abstract process capabilities (for systems that have them).
****************************************************************************/
/* Set the POSIX capabilities needed for the given purpose into the effective
* capability set of the current process. Make sure they are always removed
* from the inheritable set, because there is no circumstance in which our
* children should inherit our elevated privileges.
*/
static bool set_process_capability(enum smbd_capability capability,
bool enable)
{
/* "5" is the number of "num_cap_vals++" below */
cap_value_t cap_vals[5] = {0};
size_t num_cap_vals = 0;
cap_t cap;
#if defined(HAVE_PRCTL) && defined(PR_GET_KEEPCAPS) && defined(PR_SET_KEEPCAPS)
/* On Linux, make sure that any capabilities we grab are sticky
* across UID changes. We expect that this would allow us to keep both
* the effective and permitted capability sets, but as of circa 2.6.16,
* only the permitted set is kept. It is a bug (which we work around)
* that the effective set is lost, but we still require the effective
* set to be kept.
*/
if (!prctl(PR_GET_KEEPCAPS)) {
prctl(PR_SET_KEEPCAPS, 1);
}
#endif
cap = cap_get_proc();
if (cap == NULL) {
DEBUG(0,("set_process_capability: cap_get_proc failed: %s\n",
strerror(errno)));
return False;
}
switch (capability) {
/*
* WARNING: If you add any #ifdef for a fresh
* capability, bump up the array size in the
* declaration of cap_vals[] above just to be
* trivially safe to never overwrite cap_vals[].
*/
case KERNEL_OPLOCK_CAPABILITY:
#ifdef CAP_NETWORK_MGT
/* IRIX has CAP_NETWORK_MGT for oplocks. */
cap_vals[num_cap_vals++] = CAP_NETWORK_MGT;
#endif
break;
case DMAPI_ACCESS_CAPABILITY:
#ifdef CAP_DEVICE_MGT
/* IRIX has CAP_DEVICE_MGT for DMAPI access. */
cap_vals[num_cap_vals++] = CAP_DEVICE_MGT;
#elif CAP_MKNOD
/* Linux has CAP_MKNOD for DMAPI access. */
cap_vals[num_cap_vals++] = CAP_MKNOD;
#endif
break;
case LEASE_CAPABILITY:
#ifdef CAP_LEASE
cap_vals[num_cap_vals++] = CAP_LEASE;
#endif
break;
case DAC_OVERRIDE_CAPABILITY:
#ifdef CAP_DAC_OVERRIDE
cap_vals[num_cap_vals++] = CAP_DAC_OVERRIDE;
#endif
}
if (num_cap_vals == 0) {
cap_free(cap);
return True;
}
cap_set_flag(cap, CAP_EFFECTIVE, num_cap_vals, cap_vals,
enable ? CAP_SET : CAP_CLEAR);
/* We never want to pass capabilities down to our children, so make
* sure they are not inherited.
*/
cap_set_flag(cap, CAP_INHERITABLE, num_cap_vals, cap_vals, CAP_CLEAR);
if (cap_set_proc(cap) == -1) {
DEBUG(0, ("set_process_capability: cap_set_proc failed: %s\n",
strerror(errno)));
cap_free(cap);
return False;
}
cap_free(cap);
return True;
}
#endif /* HAVE_POSIX_CAPABILITIES */
/****************************************************************************
Gain the oplock capability from the kernel if possible.
****************************************************************************/
void set_effective_capability(enum smbd_capability capability)
{
#if defined(HAVE_POSIX_CAPABILITIES)
set_process_capability(capability, True);
#endif /* HAVE_POSIX_CAPABILITIES */
}
void drop_effective_capability(enum smbd_capability capability)
{
#if defined(HAVE_POSIX_CAPABILITIES)
set_process_capability(capability, False);
#endif /* HAVE_POSIX_CAPABILITIES */
}
/**************************************************************************
Wrapper for random().
****************************************************************************/
long sys_random(void)
{
#if defined(HAVE_RANDOM)
return (long)random();
#elif defined(HAVE_RAND)
return (long)rand();
#else
DEBUG(0,("Error - no random function available !\n"));
exit(1);
#endif
}
/**************************************************************************
Wrapper for srandom().
****************************************************************************/
void sys_srandom(unsigned int seed)
{
#if defined(HAVE_SRANDOM)
srandom(seed);
#elif defined(HAVE_SRAND)
srand(seed);
#else
DEBUG(0,("Error - no srandom function available !\n"));
exit(1);
#endif
}
#ifndef NGROUPS_MAX
#define NGROUPS_MAX 32 /* Guess... */
#endif
/**************************************************************************
Returns equivalent to NGROUPS_MAX - using sysconf if needed.
****************************************************************************/
int setgroups_max(void)
{
#if defined(SYSCONF_SC_NGROUPS_MAX)
int ret = sysconf(_SC_NGROUPS_MAX);
return (ret == -1) ? NGROUPS_MAX : ret;
#else
return NGROUPS_MAX;
#endif
}
int getgroups_max(void)
{
#if defined(DARWINOS)
/*
* On MacOS sysconf(_SC_NGROUPS_MAX) returns 16 due to MacOS's group
* nesting. However, The initgroups() manpage states the following:
* "Note that OS X supports group membership in an unlimited number
* of groups. The OS X kernel uses the group list stored in the process
* credentials only as an initial cache. Additional group memberships
* are determined by communication between the operating system and the
* opendirectoryd daemon."
*/
return INT_MAX;
#else
return setgroups_max();
#endif
}
/**************************************************************************
Wrap setgroups and getgroups for systems that declare getgroups() as
returning an array of gid_t, but actuall return an array of int.
****************************************************************************/
#if defined(HAVE_BROKEN_GETGROUPS)
#ifdef HAVE_BROKEN_GETGROUPS
#define GID_T int
#else
#define GID_T gid_t
#endif
static int sys_broken_getgroups(int setlen, gid_t *gidset)
{
GID_T *group_list;
int i, ngroups;
if(setlen == 0) {
return getgroups(0, NULL);
}
/*
* Broken case. We need to allocate a
* GID_T array of size setlen.
*/
if(setlen < 0) {
errno = EINVAL;
return -1;
}
if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
DEBUG(0,("sys_getgroups: Malloc fail.\n"));
return -1;
}
if((ngroups = getgroups(setlen, group_list)) < 0) {
int saved_errno = errno;
SAFE_FREE(group_list);
errno = saved_errno;
return -1;
}
/*
* We're safe here as if ngroups > setlen then
* getgroups *must* return EINVAL.
* pubs.opengroup.org/onlinepubs/009695399/functions/getgroups.html
*/
for(i = 0; i < ngroups; i++)
gidset[i] = (gid_t)group_list[i];
SAFE_FREE(group_list);
return ngroups;
}
static int sys_broken_setgroups(int setlen, gid_t *gidset)
{
GID_T *group_list;
int i ;
if (setlen == 0)
return 0 ;
if (setlen < 0 || setlen > setgroups_max()) {
errno = EINVAL;
return -1;
}
/*
* Broken case. We need to allocate a
* GID_T array of size setlen.
*/
if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
DEBUG(0,("sys_setgroups: Malloc fail.\n"));
return -1;
}
for(i = 0; i < setlen; i++)
group_list[i] = (GID_T) gidset[i];
if(samba_setgroups(setlen, group_list) != 0) {
int saved_errno = errno;
SAFE_FREE(group_list);
errno = saved_errno;
return -1;
}
SAFE_FREE(group_list);
return 0 ;
}
#endif /* HAVE_BROKEN_GETGROUPS */
/* This is a list of systems that require the first GID passed to setgroups(2)
* to be the effective GID. If your system is one of these, add it here.
*/
#if defined (FREEBSD) || defined (DARWINOS)
#define USE_BSD_SETGROUPS
#endif
#if defined(USE_BSD_SETGROUPS)
/* Depending on the particular BSD implementation, the first GID that is
* passed to setgroups(2) will either be ignored or will set the credential's
* effective GID. In either case, the right thing to do is to guarantee that
* gidset[0] is the effective GID.
*/
static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
{
gid_t *new_gidset = NULL;
int max;
int ret;
/* setgroups(2) will fail with EINVAL if we pass too many groups. */
max = setgroups_max();
/* No group list, just make sure we are setting the efective GID. */
if (setlen == 0) {
return samba_setgroups(1, &primary_gid);
}
/* If the primary gid is not the first array element, grow the array
* and insert it at the front.
*/
if (gidset[0] != primary_gid) {
new_gidset = SMB_MALLOC_ARRAY(gid_t, setlen + 1);
if (new_gidset == NULL) {
return -1;
}
memcpy(new_gidset + 1, gidset, (setlen * sizeof(gid_t)));
new_gidset[0] = primary_gid;
setlen++;
}
if (setlen > max) {
DEBUG(3, ("forced to truncate group list from %d to %d\n",
setlen, max));
setlen = max;
}
#if defined(HAVE_BROKEN_GETGROUPS)
ret = sys_broken_setgroups(setlen, new_gidset ? new_gidset : gidset);
#else
ret = samba_setgroups(setlen, new_gidset ? new_gidset : gidset);
#endif
if (new_gidset) {
int errsav = errno;
SAFE_FREE(new_gidset);
errno = errsav;
}
return ret;
}
#endif /* USE_BSD_SETGROUPS */
/**************************************************************************
Wrapper for getgroups. Deals with broken (int) case.
****************************************************************************/
int sys_getgroups(int setlen, gid_t *gidset)
{
#if defined(HAVE_BROKEN_GETGROUPS)
return sys_broken_getgroups(setlen, gidset);
#else
return getgroups(setlen, gidset);
#endif
}
/**************************************************************************
Wrapper for setgroups. Deals with broken (int) case and BSD case.
****************************************************************************/
int sys_setgroups(gid_t UNUSED(primary_gid), int setlen, gid_t *gidset)
{
#if !defined(HAVE_SETGROUPS)
errno = ENOSYS;
return -1;
#endif /* HAVE_SETGROUPS */
#if defined(USE_BSD_SETGROUPS)
return sys_bsd_setgroups(primary_gid, setlen, gidset);
#elif defined(HAVE_BROKEN_GETGROUPS)
return sys_broken_setgroups(setlen, gidset);
#else
return samba_setgroups(setlen, gidset);
#endif
}
/****************************************************************************
Return the major devicenumber for UNIX extensions.
****************************************************************************/
uint32_t unix_dev_major(SMB_DEV_T dev)
{
#if defined(HAVE_DEVICE_MAJOR_FN)
return (uint32_t)major(dev);
#else
return (uint32_t)(dev >> 8);
#endif
}
/****************************************************************************
Return the minor devicenumber for UNIX extensions.
****************************************************************************/
uint32_t unix_dev_minor(SMB_DEV_T dev)
{
#if defined(HAVE_DEVICE_MINOR_FN)
return (uint32_t)minor(dev);
#else
return (uint32_t)(dev & 0xff);
#endif
}
/**************************************************************************
Wrapper for realpath.
****************************************************************************/
char *sys_realpath(const char *path)
{
char *result;
#ifdef REALPATH_TAKES_NULL
result = realpath(path, NULL);
#else
result = SMB_MALLOC_ARRAY(char, PATH_MAX + 1);
if (result) {
char *resolved_path = realpath(path, result);
if (!resolved_path) {
SAFE_FREE(result);
} else {
/* SMB_ASSERT(result == resolved_path) ? */
result = resolved_path;
}
}
#endif
return result;
}
#if 0
/*******************************************************************
Return the number of CPUs.
********************************************************************/
int sys_get_number_of_cores(void)
{
int ret = -1;
#if defined(HAVE_SYSCONF)
#if defined(_SC_NPROCESSORS_ONLN)
ret = (int)sysconf(_SC_NPROCESSORS_ONLN);
#endif
#if defined(_SC_NPROCESSORS_CONF)
if (ret < 1) {
ret = (int)sysconf(_SC_NPROCESSORS_CONF);
}
#endif
#elif defined(HAVE_SYSCTL) && defined(CTL_HW)
int name[2];
unsigned int len = sizeof(ret);
name[0] = CTL_HW;
#if defined(HW_AVAILCPU)
name[1] = HW_AVAILCPU;
if (sysctl(name, 2, &ret, &len, NULL, 0) == -1) {
ret = -1;
}
#endif
#if defined(HW_NCPU)
if(ret < 1) {
name[0] = CTL_HW;
name[1] = HW_NCPU;
if (sysctl(nm, 2, &count, &len, NULL, 0) == -1) {
ret = -1;
}
}
#endif
#endif
if (ret < 1) {
ret = 1;
}
return ret;
}
#endif
static struct proc_fd_pattern {
const char *pattern;
const char *test_path;
} proc_fd_patterns[] = {
/* Linux */
{ "/proc/self/fd/%d", "/proc/self/fd/0" },
{ NULL, NULL },
};
static const char *proc_fd_pattern;
bool sys_have_proc_fds(void)
{
static bool checked;
static bool have_proc_fds;
struct proc_fd_pattern *p = NULL;
struct stat sb;
int ret;
if (checked) {
return have_proc_fds;
}
for (p = &proc_fd_patterns[0]; p->test_path != NULL; p++) {
ret = stat(p->test_path, &sb);
if (ret != 0) {
continue;
}
have_proc_fds = true;
proc_fd_pattern = p->pattern;
break;
}
checked = true;
return have_proc_fds;
}
const char *sys_proc_fd_path(int fd, char *buf, size_t bufsize)
{
int written;
if (!sys_have_proc_fds()) {
return NULL;
}
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-nonliteral"
#endif
written = snprintf(buf,
bufsize,
proc_fd_pattern,
fd);
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
if (written >= bufsize) {
return NULL;
}
return buf;
}
|