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
|
/*
Unix SMB/Netbios implementation.
Version 1.9.
Samba system utilities
Copyright (C) Andrew Tridgell 1992-1998
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"
extern int DEBUGLEVEL;
/*
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 wrapper for usleep in case we don't have one.
********************************************************************/
int sys_usleep(long usecs)
{
#ifndef HAVE_USLEEP
struct timeval tval;
#endif
/*
* We need this braindamage as the glibc usleep
* is not SPEC1170 complient... grumble... JRA.
*/
if(usecs < 0 || usecs > 1000000) {
errno = EINVAL;
return -1;
}
#if HAVE_USLEEP
usleep(usecs);
return 0;
#else /* HAVE_USLEEP */
/*
* Fake it with select...
*/
tval.tv_sec = 0;
tval.tv_usec = usecs/1000;
select(0,NULL,NULL,NULL,&tval);
return 0;
#endif /* HAVE_USLEEP */
}
/*******************************************************************
A stat() wrapper that will deal with 64 bit filesizes.
********************************************************************/
int sys_stat(const char *fname,SMB_STRUCT_STAT *sbuf)
{
int ret;
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_STAT64)
ret = stat64(fname, sbuf);
#else
ret = stat(fname, sbuf);
#endif
/* we always want directories to appear zero size */
if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
return ret;
}
/*******************************************************************
An fstat() wrapper that will deal with 64 bit filesizes.
********************************************************************/
int sys_fstat(int fd,SMB_STRUCT_STAT *sbuf)
{
int ret;
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FSTAT64)
ret = fstat64(fd, sbuf);
#else
ret = fstat(fd, sbuf);
#endif
/* we always want directories to appear zero size */
if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
return ret;
}
/*******************************************************************
An lstat() wrapper that will deal with 64 bit filesizes.
********************************************************************/
int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf)
{
int ret;
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSTAT64)
ret = lstat64(fname, sbuf);
#else
ret = lstat(fname, sbuf);
#endif
/* we always want directories to appear zero size */
if (ret == 0 && S_ISDIR(sbuf->st_mode)) sbuf->st_size = 0;
return ret;
}
/*******************************************************************
An ftruncate() wrapper that will deal with 64 bit filesizes.
********************************************************************/
int sys_ftruncate(int fd, SMB_OFF_T offset)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_FTRUNCATE64)
return ftruncate64(fd, offset);
#else
return ftruncate(fd, offset);
#endif
}
/*******************************************************************
An lseek() wrapper that will deal with 64 bit filesizes.
********************************************************************/
SMB_OFF_T sys_lseek(int fd, SMB_OFF_T offset, int whence)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OFF64_T) && defined(HAVE_LSEEK64)
return lseek64(fd, offset, whence);
#else
return lseek(fd, offset, whence);
#endif
}
/*******************************************************************
An fseek() wrapper that will deal with 64 bit filesizes.
********************************************************************/
int sys_fseek(FILE *fp, SMB_OFF_T offset, int whence)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEK64)
return fseek64(fp, offset, whence);
#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FSEEKO64)
return fseeko64(fp, offset, whence);
#else
return fseek(fp, offset, whence);
#endif
}
/*******************************************************************
An ftell() wrapper that will deal with 64 bit filesizes.
********************************************************************/
SMB_OFF_T sys_ftell(FILE *fp)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELL64)
return (SMB_OFF_T)ftell64(fp);
#elif defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(LARGE_SMB_OFF_T) && defined(HAVE_FTELLO64)
return (SMB_OFF_T)ftello64(fp);
#else
return (SMB_OFF_T)ftell(fp);
#endif
}
/*******************************************************************
A creat() wrapper that will deal with 64 bit filesizes.
********************************************************************/
int sys_creat(const char *path, mode_t mode)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_CREAT64)
return creat64(path, mode);
#else
/*
* If creat64 isn't defined then ensure we call a potential open64.
* JRA.
*/
return sys_open(path, O_WRONLY | O_CREAT | O_TRUNC, mode);
#endif
}
/*******************************************************************
An open() wrapper that will deal with 64 bit filesizes.
********************************************************************/
int sys_open(const char *path, int oflag, mode_t mode)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_OPEN64)
return open64(path, oflag, mode);
#else
return open(path, oflag, mode);
#endif
}
/*******************************************************************
An fopen() wrapper that will deal with 64 bit filesizes.
********************************************************************/
FILE *sys_fopen(const char *path, const char *type)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_FOPEN64)
return fopen64(path, type);
#else
return fopen(path, type);
#endif
}
/*******************************************************************
A readdir wrapper that will deal with 64 bit filesizes.
********************************************************************/
SMB_STRUCT_DIRENT *sys_readdir(DIR *dirp)
{
#if defined(HAVE_EXPLICIT_LARGEFILE_SUPPORT) && defined(HAVE_READDIR64)
return readdir64(dirp);
#else
return readdir(dirp);
#endif
}
/*******************************************************************
The wait() calls vary between systems
********************************************************************/
int sys_waitpid(pid_t pid,int *status,int options)
{
#ifdef HAVE_WAITPID
return waitpid(pid,status,options);
#else /* HAVE_WAITPID */
return wait4(pid, status, options, NULL);
#endif /* HAVE_WAITPID */
}
/*******************************************************************
system wrapper for getwd
********************************************************************/
char *sys_getwd(char *s)
{
char *wd;
#ifdef HAVE_GETCWD
wd = (char *)getcwd(s, sizeof (pstring));
#else
wd = (char *)getwd(s);
#endif
return wd;
}
/*******************************************************************
system wrapper for symlink
********************************************************************/
int sys_symlink(const char *oldpath, const char *newpath)
{
#ifndef HAVE_SYMLINK
errno = ENOSYS;
return -1;
#else
return symlink(oldpath, newpath);
#endif
}
/*******************************************************************
system wrapper for readlink
********************************************************************/
int sys_readlink(const char *path, char *buf, size_t bufsiz)
{
#ifndef HAVE_READLINK
errno = ENOSYS;
return -1;
#else
return readlink(path, buf, bufsiz);
#endif
}
/*******************************************************************
chown isn't used much but OS/2 doesn't have it
********************************************************************/
int sys_chown(const char *fname,uid_t uid,gid_t gid)
{
#ifndef HAVE_CHOWN
static int done;
if (!done) {
DEBUG(1,("WARNING: no chown!\n"));
done=1;
}
#else
return(chown(fname,uid,gid));
#endif
}
/*******************************************************************
os/2 also doesn't have chroot
********************************************************************/
int sys_chroot(const char *dname)
{
#ifndef HAVE_CHROOT
static int done;
if (!done) {
DEBUG(1,("WARNING: no chroot!\n"));
done=1;
}
errno = ENOSYS;
return -1;
#else
return(chroot(dname));
#endif
}
/**************************************************************************
A wrapper for gethostbyname() that tries avoids looking up hostnames
in the root domain, which can cause dial-on-demand links to come up for no
apparent reason.
****************************************************************************/
struct hostent *sys_gethostbyname(const char *name)
{
#ifdef REDUCE_ROOT_DNS_LOOKUPS
char query[256], hostname[256];
char *domain;
/* Does this name have any dots in it? If so, make no change */
if (strchr_m(name, '.'))
return(gethostbyname(name));
/* Get my hostname, which should have domain name
attached. If not, just do the gethostname on the
original string.
*/
gethostname(hostname, sizeof(hostname) - 1);
hostname[sizeof(hostname) - 1] = 0;
if ((domain = strchr_m(hostname, '.')) == NULL)
return(gethostbyname(name));
/* Attach domain name to query and do modified query.
If names too large, just do gethostname on the
original string.
*/
if((strlen(name) + strlen(domain)) >= sizeof(query))
return(gethostbyname(name));
slprintf(query, sizeof(query)-1, "%s%s", name, domain);
return(gethostbyname(query));
#else /* REDUCE_ROOT_DNS_LOOKUPS */
return(gethostbyname(name));
#endif /* REDUCE_ROOT_DNS_LOOKUPS */
}
#if defined(HAVE_IRIX_SPECIFIC_CAPABILITIES)
/**************************************************************************
Try and abstract process capabilities (for systems that have them).
****************************************************************************/
static BOOL set_process_capability( uint32 cap_flag, BOOL enable )
{
if(cap_flag == KERNEL_OPLOCK_CAPABILITY)
{
cap_t cap = cap_get_proc();
if (cap == NULL) {
DEBUG(0,("set_process_capability: cap_get_proc failed. Error was %s\n",
strerror(errno)));
return False;
}
if(enable)
cap->cap_effective |= CAP_NETWORK_MGT;
else
cap->cap_effective &= ~CAP_NETWORK_MGT;
if (cap_set_proc(cap) == -1) {
DEBUG(0,("set_process_capability: cap_set_proc failed. Error was %s\n",
strerror(errno)));
cap_free(cap);
return False;
}
cap_free(cap);
DEBUG(10,("set_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n"));
}
return True;
}
/**************************************************************************
Try and abstract inherited process capabilities (for systems that have them).
****************************************************************************/
static BOOL set_inherited_process_capability( uint32 cap_flag, BOOL enable )
{
if(cap_flag == KERNEL_OPLOCK_CAPABILITY)
{
cap_t cap = cap_get_proc();
if (cap == NULL) {
DEBUG(0,("set_inherited_process_capability: cap_get_proc failed. Error was %s\n",
strerror(errno)));
return False;
}
if(enable)
cap->cap_inheritable |= CAP_NETWORK_MGT;
else
cap->cap_inheritable &= ~CAP_NETWORK_MGT;
if (cap_set_proc(cap) == -1) {
DEBUG(0,("set_inherited_process_capability: cap_set_proc failed. Error was %s\n",
strerror(errno)));
cap_free(cap);
return False;
}
cap_free(cap);
DEBUG(10,("set_inherited_process_capability: Set KERNEL_OPLOCK_CAPABILITY.\n"));
}
return True;
}
#endif
/****************************************************************************
gain the oplock capability from the kernel if possible
****************************************************************************/
void oplock_set_capability(BOOL this_process, BOOL inherit)
{
#if HAVE_KERNEL_OPLOCKS_IRIX
set_process_capability(KERNEL_OPLOCK_CAPABILITY,this_process);
set_inherited_process_capability(KERNEL_OPLOCK_CAPABILITY,inherit);
#endif
}
/**************************************************************************
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
}
/**************************************************************************
Returns equivalent to NGROUPS_MAX - using sysconf if needed.
****************************************************************************/
int groups_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
}
/**************************************************************************
Wrapper for getgroups. Deals with broken (int) case.
****************************************************************************/
int sys_getgroups(int setlen, gid_t *gidset)
{
#if !defined(HAVE_BROKEN_GETGROUPS)
return getgroups(setlen, gidset);
#else
GID_T gid;
GID_T *group_list;
int i, ngroups;
if(setlen == 0) {
return getgroups(setlen, &gid);
}
/*
* Broken case. We need to allocate a
* GID_T array of size setlen.
*/
if(setlen < 0) {
errno = EINVAL;
return -1;
}
if (setlen == 0)
setlen = groups_max();
if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) {
DEBUG(0,("sys_getgroups: Malloc fail.\n"));
return -1;
}
if((ngroups = getgroups(setlen, group_list)) < 0) {
int saved_errno = errno;
free((char *)group_list);
errno = saved_errno;
return -1;
}
for(i = 0; i < ngroups; i++)
gidset[i] = (gid_t)group_list[i];
free((char *)group_list);
return ngroups;
#endif /* HAVE_BROKEN_GETGROUPS */
}
#ifdef HAVE_SETGROUPS
/**************************************************************************
Wrapper for setgroups. Deals with broken (int) case. Automatically used
if we have broken getgroups.
****************************************************************************/
int sys_setgroups(int setlen, gid_t *gidset)
{
#if !defined(HAVE_BROKEN_GETGROUPS)
return setgroups(setlen, gidset);
#else
GID_T *group_list;
int i ;
if (setlen == 0)
return 0 ;
if (setlen < 0 || setlen > groups_max()) {
errno = EINVAL;
return -1;
}
/*
* Broken case. We need to allocate a
* GID_T array of size setlen.
*/
if((group_list = (GID_T *)malloc(setlen * sizeof(GID_T))) == NULL) {
DEBUG(0,("sys_setgroups: Malloc fail.\n"));
return -1;
}
for(i = 0; i < setlen; i++)
group_list[i] = (GID_T) gidset[i];
if(setgroups(setlen, group_list) != 0) {
int saved_errno = errno;
free((char *)group_list);
errno = saved_errno;
return -1;
}
free((char *)group_list);
return 0 ;
#endif /* HAVE_BROKEN_GETGROUPS */
}
#endif /* HAVE_SETGROUPS */
/*
* We only wrap pw_name and pw_passwd for now as these
* are the only potentially modified fields.
*/
/**************************************************************************
Helper function for getpwnam/getpwuid wrappers.
****************************************************************************/
struct saved_pw {
fstring pw_name;
fstring pw_passwd;
fstring pw_gecos;
pstring pw_dir;
pstring pw_shell;
struct passwd pass;
};
static struct saved_pw pw_mod; /* This is the structure returned - can be modified. */
static struct saved_pw pw_cache; /* This is the structure saved - used to check cache. */
static int num_lookups; /* Counter so we don't always use cache. */
#ifndef PW_RET_CACHE_MAX_LOOKUPS
#define PW_RET_CACHE_MAX_LOOKUPS 100
#endif
static void copy_pwent(struct saved_pw *dst, struct passwd *pass)
{
memcpy((char *)&dst->pass, pass, sizeof(struct passwd));
fstrcpy(dst->pw_name, pass->pw_name);
dst->pass.pw_name = dst->pw_name;
fstrcpy(dst->pw_passwd, pass->pw_passwd);
dst->pass.pw_passwd = dst->pw_passwd;
fstrcpy(dst->pw_gecos, pass->pw_gecos);
dst->pass.pw_gecos = dst->pw_gecos;
pstrcpy(dst->pw_dir, pass->pw_dir);
dst->pass.pw_dir = dst->pw_dir;
pstrcpy(dst->pw_shell, pass->pw_shell);
dst->pass.pw_shell = dst->pw_shell;
}
static struct passwd *setup_pwret(struct passwd *pass)
{
if (pass == NULL) {
/* Clear the caches. */
memset(&pw_cache, '\0', sizeof(struct saved_pw));
memset(&pw_mod, '\0', sizeof(struct saved_pw));
num_lookups = 0;
return NULL;
}
copy_pwent( &pw_mod, pass);
if (pass != &pw_cache.pass) {
/* If it's a cache miss we must also refill the cache. */
copy_pwent( &pw_cache, pass);
num_lookups = 1;
} else {
/* Cache hit. */
num_lookups++;
num_lookups = (num_lookups % PW_RET_CACHE_MAX_LOOKUPS);
}
return &pw_mod.pass;
}
/**************************************************************************
Wrappers for setpwent(), getpwent() and endpwent()
****************************************************************************/
void sys_setpwent(void)
{
setup_pwret(NULL); /* Clear cache. */
setpwent();
}
struct passwd *sys_getpwent(void)
{
return setup_pwret(getpwent());
}
void sys_endpwent(void)
{
setup_pwret(NULL); /* Clear cache. */
endpwent();
}
/**************************************************************************
Wrapper for getpwnam(). Always returns a static that can be modified.
****************************************************************************/
struct passwd *sys_getpwnam(const char *name)
{
if (!name || !name[0])
return NULL;
/* check for a cache hit first */
if (num_lookups && pw_cache.pass.pw_name && !strcmp(name, pw_cache.pass.pw_name)) {
return setup_pwret(&pw_cache.pass);
}
return setup_pwret(getpwnam(name));
}
/**************************************************************************
Wrapper for getpwuid(). Always returns a static that can be modified.
****************************************************************************/
struct passwd *sys_getpwuid(uid_t uid)
{
if (num_lookups && pw_cache.pass.pw_name && (uid == pw_cache.pass.pw_uid)) {
return setup_pwret(&pw_cache.pass);
}
return setup_pwret(getpwuid(uid));
}
/**************************************************************************
Extract a command into an arg list. Uses a static pstring for storage.
Caller frees returned arg list (which contains pointers into the static pstring).
****************************************************************************/
static char **extract_args(const char *command)
{
static pstring trunc_cmd;
char *ptr;
int argcl;
char **argl = NULL;
int i;
pstrcpy(trunc_cmd, command);
if(!(ptr = strtok(trunc_cmd, " \t"))) {
errno = EINVAL;
return NULL;
}
/*
* Count the args.
*/
for( argcl = 1; ptr; ptr = strtok(NULL, " \t"))
argcl++;
if((argl = (char **)malloc((argcl + 1) * sizeof(char *))) == NULL)
return NULL;
/*
* Now do the extraction.
*/
pstrcpy(trunc_cmd, command);
ptr = strtok(trunc_cmd, " \t");
i = 0;
argl[i++] = ptr;
while((ptr = strtok(NULL, " \t")) != NULL)
argl[i++] = ptr;
argl[i++] = NULL;
return argl;
}
/**************************************************************************
Wrapper for fork. Ensures that mypid is reset. Used so we can write
a sys_getpid() that only does a system call *once*.
****************************************************************************/
static pid_t mypid = (pid_t)-1;
pid_t sys_fork(void)
{
pid_t forkret = fork();
if (forkret == (pid_t)0) /* Child - reset mypid so sys_getpid does a system call. */
mypid = (pid_t) -1;
return forkret;
}
/**************************************************************************
Wrapper for getpid. Ensures we only do a system call *once*.
****************************************************************************/
pid_t sys_getpid(void)
{
if (mypid == (pid_t)-1)
mypid = getpid();
return mypid;
}
/**************************************************************************
Wrapper for popen. Safer as it doesn't search a path.
Modified from the glibc sources.
modified by tridge to return a file descriptor. We must kick our FILE* habit
****************************************************************************/
typedef struct _popen_list
{
int fd;
pid_t child_pid;
struct _popen_list *next;
} popen_list;
static popen_list *popen_chain;
int sys_popen(const char *command)
{
int parent_end, child_end;
int pipe_fds[2];
popen_list *entry = NULL;
char **argl = NULL;
if (pipe(pipe_fds) < 0)
return -1;
parent_end = pipe_fds[0];
child_end = pipe_fds[1];
if (!*command) {
errno = EINVAL;
goto err_exit;
}
if((entry = (popen_list *)malloc(sizeof(popen_list))) == NULL)
goto err_exit;
ZERO_STRUCTP(entry);
/*
* Extract the command and args into a NULL terminated array.
*/
if(!(argl = extract_args(command)))
goto err_exit;
entry->child_pid = sys_fork();
if (entry->child_pid == -1) {
goto err_exit;
}
if (entry->child_pid == 0) {
/*
* Child !
*/
int child_std_end = STDOUT_FILENO;
popen_list *p;
close(parent_end);
if (child_end != child_std_end) {
dup2 (child_end, child_std_end);
close (child_end);
}
/*
* POSIX.2: "popen() shall ensure that any streams from previous
* popen() calls that remain open in the parent process are closed
* in the new child process."
*/
for (p = popen_chain; p; p = p->next)
close(p->fd);
execv(argl[0], argl);
_exit (127);
}
/*
* Parent.
*/
close (child_end);
free((char *)argl);
/* Link into popen_chain. */
entry->next = popen_chain;
popen_chain = entry;
entry->fd = parent_end;
return entry->fd;
err_exit:
if(entry)
free((char *)entry);
if(argl)
free((char *)argl);
close(pipe_fds[0]);
close(pipe_fds[1]);
return -1;
}
/**************************************************************************
Wrapper for pclose. Modified from the glibc sources.
****************************************************************************/
int sys_pclose(int fd)
{
int wstatus;
popen_list **ptr = &popen_chain;
popen_list *entry = NULL;
pid_t wait_pid;
int status = -1;
/* Unlink from popen_chain. */
for ( ; *ptr != NULL; ptr = &(*ptr)->next) {
if ((*ptr)->fd == fd) {
entry = *ptr;
*ptr = (*ptr)->next;
status = 0;
break;
}
}
if (status < 0 || close(entry->fd) < 0)
return -1;
/*
* As Samba is catching and eating child process
* exits we don't really care about the child exit
* code, a -1 with errno = ECHILD will do fine for us.
*/
do {
wait_pid = sys_waitpid (entry->child_pid, &wstatus, 0);
} while (wait_pid == -1 && errno == EINTR);
free((char *)entry);
if (wait_pid == -1)
return -1;
return wstatus;
}
/**************************************************************************
Wrappers for dlopen, dlsym, dlclose.
****************************************************************************/
void *sys_dlopen(const char *name, int flags)
{
#ifdef HAVE_LIBDL
return dlopen(name, flags);
#else
return NULL;
#endif
}
void *sys_dlsym(void *handle, char *symbol)
{
#ifdef HAVE_LIBDL
return dlsym(handle, symbol);
#else
return NULL;
#endif
}
int sys_dlclose (void *handle)
{
#ifdef HAVE_LIBDL
return dlclose(handle);
#else
return 0;
#endif
}
|