source: MondoRescue/branches/3.2/mindi-busybox/libpwdgrp/pwd_grp.c@ 3828

Last change on this file since 3828 was 3232, checked in by Bruno Cornec, 12 years ago
  • Update mindi-busybox to 1.21.1
File size: 23.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* Copyright (C) 2003 Manuel Novoa III
3 *
4 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
5 */
6
7/* Nov 6, 2003 Initial version.
8 *
9 * NOTE: This implementation is quite strict about requiring all
10 * field seperators. It also does not allow leading whitespace
11 * except when processing the numeric fields. glibc is more
12 * lenient. See the various glibc difference comments below.
13 *
14 * TODO:
15 * Move to dynamic allocation of (currently statically allocated)
16 * buffers; especially for the group-related functions since
17 * large group member lists will cause error returns.
18 */
19
20#include "libbb.h"
21#include <assert.h>
22
23/**********************************************************************/
24/* Sizes for statically allocated buffers. */
25
26#define PWD_BUFFER_SIZE 256
27#define GRP_BUFFER_SIZE 256
28
29/**********************************************************************/
30/* Prototypes for internal functions. */
31
32static int bb__pgsreader(
33 int FAST_FUNC (*parserfunc)(void *d, char *line),
34 void *data,
35 char *__restrict line_buff,
36 size_t buflen,
37 FILE *f);
38
39static int FAST_FUNC bb__parsepwent(void *pw, char *line);
40static int FAST_FUNC bb__parsegrent(void *gr, char *line);
41#if ENABLE_USE_BB_SHADOW
42static int FAST_FUNC bb__parsespent(void *sp, char *line);
43#endif
44
45/**********************************************************************/
46/* We avoid having big global data. */
47
48struct statics {
49 /* Smaller things first */
50 /* It's ok to use one buffer for getpwuid and getpwnam. Manpage says:
51 * "The return value may point to a static area, and may be overwritten
52 * by subsequent calls to getpwent(), getpwnam(), or getpwuid()."
53 */
54 struct passwd getpw_resultbuf;
55 struct group getgr_resultbuf;
56
57 char getpw_buffer[PWD_BUFFER_SIZE];
58 char getgr_buffer[GRP_BUFFER_SIZE];
59#if 0 //ENABLE_USE_BB_SHADOW
60 struct spwd getsp_resultbuf;
61 char getsp_buffer[PWD_BUFFER_SIZE];
62#endif
63// Not converted - too small to bother
64//pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
65//FILE *pwf /*= NULL*/;
66//FILE *grf /*= NULL*/;
67//FILE *spf /*= NULL*/;
68};
69
70static struct statics *ptr_to_statics;
71
72static struct statics *get_S(void)
73{
74 if (!ptr_to_statics)
75 ptr_to_statics = xzalloc(sizeof(*ptr_to_statics));
76 return ptr_to_statics;
77}
78
79/* Always use in this order, get_S() must be called first */
80#define RESULTBUF(name) &((S = get_S())->name##_resultbuf)
81#define BUFFER(name) (S->name##_buffer)
82
83/**********************************************************************/
84/* For the various fget??ent_r funcs, return
85 *
86 * 0: success
87 * ENOENT: end-of-file encountered
88 * ERANGE: buflen too small
89 * other error values possible. See bb__pgsreader.
90 *
91 * Also, *result == resultbuf on success and NULL on failure.
92 *
93 * NOTE: glibc difference - For the ENOENT case, glibc also sets errno.
94 * We do not, as it really isn't an error if we reach the end-of-file.
95 * Doing so is analogous to having fgetc() set errno on EOF.
96 */
97/**********************************************************************/
98
99int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
100 char *__restrict buffer, size_t buflen,
101 struct passwd **__restrict result)
102{
103 int rv;
104
105 *result = NULL;
106
107 rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream);
108 if (!rv) {
109 *result = resultbuf;
110 }
111
112 return rv;
113}
114
115int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
116 char *__restrict buffer, size_t buflen,
117 struct group **__restrict result)
118{
119 int rv;
120
121 *result = NULL;
122
123 rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream);
124 if (!rv) {
125 *result = resultbuf;
126 }
127
128 return rv;
129}
130
131#if ENABLE_USE_BB_SHADOW
132#ifdef UNUSED_FOR_NOW
133int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf,
134 char *__restrict buffer, size_t buflen,
135 struct spwd **__restrict result)
136{
137 int rv;
138
139 *result = NULL;
140
141 rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream);
142 if (!rv) {
143 *result = resultbuf;
144 }
145
146 return rv;
147}
148#endif
149#endif
150
151/**********************************************************************/
152/* For the various fget??ent funcs, return NULL on failure and a
153 * pointer to the appropriate struct (statically allocated) on success.
154 * TODO: audit & stop using these in bbox, they pull in static buffers */
155/**********************************************************************/
156
157#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
158struct passwd *fgetpwent(FILE *stream)
159{
160 struct statics *S;
161 struct passwd *resultbuf = RESULTBUF(getpw);
162 char *buffer = BUFFER(getpw);
163 struct passwd *result;
164
165 fgetpwent_r(stream, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
166 return result;
167}
168
169struct group *fgetgrent(FILE *stream)
170{
171 struct statics *S;
172 struct group *resultbuf = RESULTBUF(getgr);
173 char *buffer = BUFFER(getgr);
174 struct group *result;
175
176 fgetgrent_r(stream, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
177 return result;
178}
179#endif
180
181#if ENABLE_USE_BB_SHADOW
182#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
183struct spwd *fgetspent(FILE *stream)
184{
185 struct statics *S;
186 struct spwd *resultbuf = RESULTBUF(getsp);
187 char *buffer = BUFFER(getsp);
188 struct spwd *result;
189
190 fgetspent_r(stream, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
191 return result;
192}
193#endif
194
195#ifdef UNUSED_FOR_NOW
196int sgetspent_r(const char *string, struct spwd *result_buf,
197 char *buffer, size_t buflen, struct spwd **result)
198{
199 int rv = ERANGE;
200
201 *result = NULL;
202
203 if (buflen < PWD_BUFFER_SIZE) {
204 DO_ERANGE:
205 errno = rv;
206 goto DONE;
207 }
208
209 if (string != buffer) {
210 if (strlen(string) >= buflen) {
211 goto DO_ERANGE;
212 }
213 strcpy(buffer, string);
214 }
215
216 rv = bb__parsespent(result_buf, buffer);
217 if (!rv) {
218 *result = result_buf;
219 }
220
221 DONE:
222 return rv;
223}
224#endif
225#endif /* ENABLE_USE_BB_SHADOW */
226
227/**********************************************************************/
228
229#define GETXXKEY_R_FUNC getpwnam_r
230#define GETXXKEY_R_PARSER bb__parsepwent
231#define GETXXKEY_R_ENTTYPE struct passwd
232#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->pw_name, key))
233#define GETXXKEY_R_KEYTYPE const char *__restrict
234#define GETXXKEY_R_PATHNAME _PATH_PASSWD
235#include "pwd_grp_internal.c"
236
237#define GETXXKEY_R_FUNC getgrnam_r
238#define GETXXKEY_R_PARSER bb__parsegrent
239#define GETXXKEY_R_ENTTYPE struct group
240#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->gr_name, key))
241#define GETXXKEY_R_KEYTYPE const char *__restrict
242#define GETXXKEY_R_PATHNAME _PATH_GROUP
243#include "pwd_grp_internal.c"
244
245#if ENABLE_USE_BB_SHADOW
246#define GETXXKEY_R_FUNC getspnam_r
247#define GETXXKEY_R_PARSER bb__parsespent
248#define GETXXKEY_R_ENTTYPE struct spwd
249#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->sp_namp, key))
250#define GETXXKEY_R_KEYTYPE const char *__restrict
251#define GETXXKEY_R_PATHNAME _PATH_SHADOW
252#include "pwd_grp_internal.c"
253#endif
254
255#define GETXXKEY_R_FUNC getpwuid_r
256#define GETXXKEY_R_PARSER bb__parsepwent
257#define GETXXKEY_R_ENTTYPE struct passwd
258#define GETXXKEY_R_TEST(ENT) ((ENT)->pw_uid == key)
259#define GETXXKEY_R_KEYTYPE uid_t
260#define GETXXKEY_R_PATHNAME _PATH_PASSWD
261#include "pwd_grp_internal.c"
262
263#define GETXXKEY_R_FUNC getgrgid_r
264#define GETXXKEY_R_PARSER bb__parsegrent
265#define GETXXKEY_R_ENTTYPE struct group
266#define GETXXKEY_R_TEST(ENT) ((ENT)->gr_gid == key)
267#define GETXXKEY_R_KEYTYPE gid_t
268#define GETXXKEY_R_PATHNAME _PATH_GROUP
269#include "pwd_grp_internal.c"
270
271/**********************************************************************/
272/* TODO: audit & stop using these in bbox, they pull in static buffers */
273
274/* This one has many users */
275struct passwd *getpwuid(uid_t uid)
276{
277 struct statics *S;
278 struct passwd *resultbuf = RESULTBUF(getpw);
279 char *buffer = BUFFER(getpw);
280 struct passwd *result;
281
282 getpwuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
283 return result;
284}
285
286/* This one has many users */
287struct group *getgrgid(gid_t gid)
288{
289 struct statics *S;
290 struct group *resultbuf = RESULTBUF(getgr);
291 char *buffer = BUFFER(getgr);
292 struct group *result;
293
294 getgrgid_r(gid, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
295 return result;
296}
297
298#if 0 //ENABLE_USE_BB_SHADOW
299/* This function is non-standard and is currently not built. It seems
300 * to have been created as a reentrant version of the non-standard
301 * functions getspuid. Why getspuid was added, I do not know. */
302int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf,
303 char *__restrict buffer, size_t buflen,
304 struct spwd **__restrict result)
305{
306 int rv;
307 struct passwd *pp;
308 struct passwd password;
309 char pwd_buff[PWD_BUFFER_SIZE];
310
311 *result = NULL;
312 rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp);
313 if (!rv) {
314 rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result);
315 }
316
317 return rv;
318}
319
320/* This function is non-standard and is currently not built.
321 * Why it was added, I do not know. */
322struct spwd *getspuid(uid_t uid)
323{
324 struct statics *S;
325 struct spwd *resultbuf = RESULTBUF(getsp);
326 char *buffer = BUFFER(getsp);
327 struct spwd *result;
328
329 getspuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
330 return result;
331}
332#endif
333
334/* This one has many users */
335struct passwd *getpwnam(const char *name)
336{
337 struct statics *S;
338 struct passwd *resultbuf = RESULTBUF(getpw);
339 char *buffer = BUFFER(getpw);
340 struct passwd *result;
341
342 getpwnam_r(name, resultbuf, buffer, sizeof(BUFFER(getpw)), &result);
343 return result;
344}
345
346/* This one has many users */
347struct group *getgrnam(const char *name)
348{
349 struct statics *S;
350 struct group *resultbuf = RESULTBUF(getgr);
351 char *buffer = BUFFER(getgr);
352 struct group *result;
353
354 getgrnam_r(name, resultbuf, buffer, sizeof(BUFFER(getgr)), &result);
355 return result;
356}
357
358#if 0 //ENABLE_USE_BB_SHADOW
359struct spwd *getspnam(const char *name)
360{
361 struct statics *S;
362 struct spwd *resultbuf = RESULTBUF(getsp);
363 char *buffer = BUFFER(getsp);
364 struct spwd *result;
365
366 getspnam_r(name, resultbuf, buffer, sizeof(BUFFER(getsp)), &result);
367 return result;
368}
369#endif
370
371/**********************************************************************/
372
373/* FIXME: we don't have such CONFIG_xx - ?! */
374
375#if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER
376static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
377# define LOCK pthread_mutex_lock(&mylock)
378# define UNLOCK pthread_mutex_unlock(&mylock);
379#else
380# define LOCK ((void) 0)
381# define UNLOCK ((void) 0)
382#endif
383
384static FILE *pwf /*= NULL*/;
385void setpwent(void)
386{
387 LOCK;
388 if (pwf) {
389 rewind(pwf);
390 }
391 UNLOCK;
392}
393
394void endpwent(void)
395{
396 LOCK;
397 if (pwf) {
398 fclose(pwf);
399 pwf = NULL;
400 }
401 UNLOCK;
402}
403
404
405int getpwent_r(struct passwd *__restrict resultbuf,
406 char *__restrict buffer, size_t buflen,
407 struct passwd **__restrict result)
408{
409 int rv;
410
411 LOCK;
412 *result = NULL; /* In case of error... */
413
414 if (!pwf) {
415 pwf = fopen_for_read(_PATH_PASSWD);
416 if (!pwf) {
417 rv = errno;
418 goto ERR;
419 }
420 close_on_exec_on(fileno(pwf));
421 }
422
423 rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf);
424 if (!rv) {
425 *result = resultbuf;
426 }
427
428 ERR:
429 UNLOCK;
430 return rv;
431}
432
433static FILE *grf /*= NULL*/;
434void setgrent(void)
435{
436 LOCK;
437 if (grf) {
438 rewind(grf);
439 }
440 UNLOCK;
441}
442
443void endgrent(void)
444{
445 LOCK;
446 if (grf) {
447 fclose(grf);
448 grf = NULL;
449 }
450 UNLOCK;
451}
452
453int getgrent_r(struct group *__restrict resultbuf,
454 char *__restrict buffer, size_t buflen,
455 struct group **__restrict result)
456{
457 int rv;
458
459 LOCK;
460 *result = NULL; /* In case of error... */
461
462 if (!grf) {
463 grf = fopen_for_read(_PATH_GROUP);
464 if (!grf) {
465 rv = errno;
466 goto ERR;
467 }
468 close_on_exec_on(fileno(grf));
469 }
470
471 rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf);
472 if (!rv) {
473 *result = resultbuf;
474 }
475
476 ERR:
477 UNLOCK;
478 return rv;
479}
480
481#ifdef UNUSED_FOR_NOW
482#if ENABLE_USE_BB_SHADOW
483static FILE *spf /*= NULL*/;
484void setspent(void)
485{
486 LOCK;
487 if (spf) {
488 rewind(spf);
489 }
490 UNLOCK;
491}
492
493void endspent(void)
494{
495 LOCK;
496 if (spf) {
497 fclose(spf);
498 spf = NULL;
499 }
500 UNLOCK;
501}
502
503int getspent_r(struct spwd *resultbuf, char *buffer,
504 size_t buflen, struct spwd **result)
505{
506 int rv;
507
508 LOCK;
509 *result = NULL; /* In case of error... */
510
511 if (!spf) {
512 spf = fopen_for_read(_PATH_SHADOW);
513 if (!spf) {
514 rv = errno;
515 goto ERR;
516 }
517 close_on_exec_on(fileno(spf));
518 }
519
520 rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, spf);
521 if (!rv) {
522 *result = resultbuf;
523 }
524
525 ERR:
526 UNLOCK;
527 return rv;
528}
529#endif
530#endif /* UNUSED_FOR_NOW */
531
532#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
533struct passwd *getpwent(void)
534{
535 static char line_buff[PWD_BUFFER_SIZE];
536 static struct passwd pwd;
537 struct passwd *result;
538
539 getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
540 return result;
541}
542
543struct group *getgrent(void)
544{
545 static char line_buff[GRP_BUFFER_SIZE];
546 static struct group gr;
547 struct group *result;
548
549 getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
550 return result;
551}
552
553#if ENABLE_USE_BB_SHADOW
554struct spwd *getspent(void)
555{
556 static char line_buff[PWD_BUFFER_SIZE];
557 static struct spwd spwd;
558 struct spwd *result;
559
560 getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
561 return result;
562}
563
564struct spwd *sgetspent(const char *string)
565{
566 static char line_buff[PWD_BUFFER_SIZE];
567 static struct spwd spwd;
568 struct spwd *result;
569
570 sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
571 return result;
572}
573#endif
574#endif /* UNUSED_SINCE_WE_AVOID_STATIC_BUFS */
575
576static gid_t *getgrouplist_internal(int *ngroups_ptr, const char *user, gid_t gid)
577{
578 FILE *grfile;
579 gid_t *group_list;
580 int ngroups;
581 struct group group;
582 char buff[PWD_BUFFER_SIZE];
583
584 /* We alloc space for 8 gids at a time. */
585 group_list = xmalloc(8 * sizeof(group_list[0]));
586 group_list[0] = gid;
587 ngroups = 1;
588
589 grfile = fopen_for_read(_PATH_GROUP);
590 if (grfile) {
591 while (!bb__pgsreader(bb__parsegrent, &group, buff, sizeof(buff), grfile)) {
592 char **m;
593 assert(group.gr_mem); /* Must have at least a NULL terminator. */
594 if (group.gr_gid == gid)
595 continue;
596 for (m = group.gr_mem; *m; m++) {
597 if (strcmp(*m, user) != 0)
598 continue;
599 group_list = xrealloc_vector(group_list, /*8=2^3:*/ 3, ngroups);
600 group_list[ngroups++] = group.gr_gid;
601 break;
602 }
603 }
604 fclose(grfile);
605 }
606 *ngroups_ptr = ngroups;
607 return group_list;
608}
609
610int initgroups(const char *user, gid_t gid)
611{
612 int ngroups;
613 gid_t *group_list = getgrouplist_internal(&ngroups, user, gid);
614
615 ngroups = setgroups(ngroups, group_list);
616 free(group_list);
617 return ngroups;
618}
619
620int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
621{
622 int ngroups_old = *ngroups;
623 gid_t *group_list = getgrouplist_internal(ngroups, user, gid);
624
625 if (*ngroups <= ngroups_old) {
626 ngroups_old = *ngroups;
627 memcpy(groups, group_list, ngroups_old * sizeof(groups[0]));
628 } else {
629 ngroups_old = -1;
630 }
631 free(group_list);
632 return ngroups_old;
633}
634
635#ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
636int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
637{
638 int rv = -1;
639
640#if 0
641 /* glibc does this check */
642 if (!p || !f) {
643 errno = EINVAL;
644 return rv;
645 }
646#endif
647
648 /* No extra thread locking is needed above what fprintf does. */
649 if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n",
650 p->pw_name, p->pw_passwd,
651 (unsigned long)(p->pw_uid),
652 (unsigned long)(p->pw_gid),
653 p->pw_gecos, p->pw_dir, p->pw_shell) >= 0
654 ) {
655 rv = 0;
656 }
657
658 return rv;
659}
660
661int putgrent(const struct group *__restrict p, FILE *__restrict f)
662{
663 int rv = -1;
664
665#if 0
666 /* glibc does this check */
667 if (!p || !f) {
668 errno = EINVAL;
669 return rv;
670 }
671#endif
672
673 if (fprintf(f, "%s:%s:%lu:",
674 p->gr_name, p->gr_passwd,
675 (unsigned long)(p->gr_gid)) >= 0
676 ) {
677 static const char format[] ALIGN1 = ",%s";
678
679 char **m;
680 const char *fmt;
681
682 fmt = format + 1;
683
684 assert(p->gr_mem);
685 m = p->gr_mem;
686
687 while (1) {
688 if (!*m) {
689 if (fputc('\n', f) >= 0) {
690 rv = 0;
691 }
692 break;
693 }
694 if (fprintf(f, fmt, *m) < 0) {
695 break;
696 }
697 m++;
698 fmt = format;
699 }
700 }
701
702 return rv;
703}
704#endif
705
706#if ENABLE_USE_BB_SHADOW
707#ifdef UNUSED_FOR_NOW
708static const unsigned char put_sp_off[] ALIGN1 = {
709 offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */
710 offsetof(struct spwd, sp_min), /* 3 - not a char ptr */
711 offsetof(struct spwd, sp_max), /* 4 - not a char ptr */
712 offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */
713 offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */
714 offsetof(struct spwd, sp_expire) /* 7 - not a char ptr */
715};
716
717int putspent(const struct spwd *p, FILE *stream)
718{
719 const char *fmt;
720 long x;
721 int i;
722 int rv = -1;
723
724 /* Unlike putpwent and putgrent, glibc does not check the args. */
725 if (fprintf(stream, "%s:%s:", p->sp_namp,
726 (p->sp_pwdp ? p->sp_pwdp : "")) < 0
727 ) {
728 goto DO_UNLOCK;
729 }
730
731 for (i = 0; i < sizeof(put_sp_off); i++) {
732 fmt = "%ld:";
733 x = *(long *)((char *)p + put_sp_off[i]);
734 if (x == -1) {
735 fmt += 3;
736 }
737 if (fprintf(stream, fmt, x) < 0) {
738 goto DO_UNLOCK;
739 }
740 }
741
742 if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
743 goto DO_UNLOCK;
744 }
745
746 if (fputc('\n', stream) > 0) {
747 rv = 0;
748 }
749
750 DO_UNLOCK:
751 return rv;
752}
753#endif
754#endif /* USE_BB_SHADOW */
755
756/**********************************************************************/
757/* Internal functions */
758/**********************************************************************/
759
760static const unsigned char pw_off[] ALIGN1 = {
761 offsetof(struct passwd, pw_name), /* 0 */
762 offsetof(struct passwd, pw_passwd), /* 1 */
763 offsetof(struct passwd, pw_uid), /* 2 - not a char ptr */
764 offsetof(struct passwd, pw_gid), /* 3 - not a char ptr */
765 offsetof(struct passwd, pw_gecos), /* 4 */
766 offsetof(struct passwd, pw_dir), /* 5 */
767 offsetof(struct passwd, pw_shell) /* 6 */
768};
769
770static int FAST_FUNC bb__parsepwent(void *data, char *line)
771{
772 char *endptr;
773 char *p;
774 int i;
775
776 i = 0;
777 while (1) {
778 p = (char *) data + pw_off[i];
779
780 if (i < 2 || i > 3) {
781 *((char **) p) = line;
782 if (i == 6) {
783 return 0;
784 }
785 /* NOTE: glibc difference - glibc allows omission of
786 * ':' seperators after the gid field if all remaining
787 * entries are empty. We require all separators. */
788 line = strchr(line, ':');
789 if (!line) {
790 break;
791 }
792 } else {
793 unsigned long t = strtoul(line, &endptr, 10);
794 /* Make sure we had at least one digit, and that the
795 * failing char is the next field seperator ':'. See
796 * glibc difference note above. */
797 /* TODO: Also check for leading whitespace? */
798 if ((endptr == line) || (*endptr != ':')) {
799 break;
800 }
801 line = endptr;
802 if (i & 1) { /* i == 3 -- gid */
803 *((gid_t *) p) = t;
804 } else { /* i == 2 -- uid */
805 *((uid_t *) p) = t;
806 }
807 }
808
809 *line++ = '\0';
810 i++;
811 } /* while (1) */
812
813 return -1;
814}
815
816/**********************************************************************/
817
818static const unsigned char gr_off[] ALIGN1 = {
819 offsetof(struct group, gr_name), /* 0 */
820 offsetof(struct group, gr_passwd), /* 1 */
821 offsetof(struct group, gr_gid) /* 2 - not a char ptr */
822};
823
824static int FAST_FUNC bb__parsegrent(void *data, char *line)
825{
826 char *endptr;
827 char *p;
828 int i;
829 char **members;
830 char *end_of_buf;
831
832 end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
833 i = 0;
834 while (1) {
835 p = (char *) data + gr_off[i];
836
837 if (i < 2) {
838 *((char **) p) = line;
839 line = strchr(line, ':');
840 if (!line) {
841 break;
842 }
843 *line++ = '\0';
844 i++;
845 } else {
846 *((gid_t *) p) = strtoul(line, &endptr, 10);
847
848 /* NOTE: glibc difference - glibc allows omission of the
849 * trailing colon when there is no member list. We treat
850 * this as an error. */
851
852 /* Make sure we had at least one digit, and that the
853 * failing char is the next field seperator ':'. See
854 * glibc difference note above. */
855 if ((endptr == line) || (*endptr != ':')) {
856 break;
857 }
858
859 i = 1; /* Count terminating NULL ptr. */
860 p = endptr;
861
862 if (p[1]) { /* We have a member list to process. */
863 /* Overwrite the last ':' with a ',' before counting.
864 * This allows us to (1) test for initial ','
865 * and (2) adds one ',' so that the number of commas
866 * equals the member count. */
867 *p = ',';
868 do {
869 /* NOTE: glibc difference - glibc allows and trims leading
870 * (but not trailing) space. We treat this as an error. */
871 /* NOTE: glibc difference - glibc allows consecutive and
872 * trailing commas, and ignores "empty string" users. We
873 * treat this as an error. */
874 if (*p == ',') {
875 ++i;
876 *p = 0; /* nul-terminate each member string. */
877 if (!*++p || (*p == ',') || isspace(*p)) {
878 goto ERR;
879 }
880 }
881 } while (*++p);
882 }
883
884 /* Now align (p+1), rounding up. */
885 /* Assumes sizeof(char **) is a power of 2. */
886 members = (char **)( (((intptr_t) p) + sizeof(char **))
887 & ~((intptr_t)(sizeof(char **) - 1)) );
888
889 if (((char *)(members + i)) > end_of_buf) { /* No space. */
890 break;
891 }
892
893 ((struct group *) data)->gr_mem = members;
894
895 if (--i) {
896 p = endptr; /* Pointing to char prior to first member. */
897 while (1) {
898 *members++ = ++p;
899 if (!--i)
900 break;
901 while (*++p)
902 continue;
903 }
904 }
905 *members = NULL;
906
907 return 0;
908 }
909 } /* while (1) */
910
911 ERR:
912 return -1;
913}
914
915/**********************************************************************/
916
917#if ENABLE_USE_BB_SHADOW
918static const unsigned char sp_off[] ALIGN1 = {
919 offsetof(struct spwd, sp_namp), /* 0: char* */
920 offsetof(struct spwd, sp_pwdp), /* 1: char* */
921 offsetof(struct spwd, sp_lstchg), /* 2: long */
922 offsetof(struct spwd, sp_min), /* 3: long */
923 offsetof(struct spwd, sp_max), /* 4: long */
924 offsetof(struct spwd, sp_warn), /* 5: long */
925 offsetof(struct spwd, sp_inact), /* 6: long */
926 offsetof(struct spwd, sp_expire), /* 7: long */
927 offsetof(struct spwd, sp_flag) /* 8: unsigned long */
928};
929
930static int FAST_FUNC bb__parsespent(void *data, char *line)
931{
932 char *endptr;
933 char *p;
934 int i;
935
936 i = 0;
937 while (1) {
938 p = (char *) data + sp_off[i];
939 if (i < 2) {
940 *((char **) p) = line;
941 line = strchr(line, ':');
942 if (!line) {
943 break; /* error */
944 }
945 } else {
946 *((long *) p) = strtoul(line, &endptr, 10);
947 if (endptr == line) {
948 *((long *) p) = -1L;
949 }
950 line = endptr;
951 if (i == 8) {
952 if (*line != '\0') {
953 break; /* error */
954 }
955 return 0; /* all ok */
956 }
957 if (*line != ':') {
958 break; /* error */
959 }
960 }
961 *line++ = '\0';
962 i++;
963 }
964
965 return EINVAL;
966}
967#endif
968
969/**********************************************************************/
970
971/* Reads until EOF, or until it finds a line which fits in the buffer
972 * and for which the parser function succeeds.
973 *
974 * Returns 0 on success and ENOENT for end-of-file (glibc convention).
975 */
976static int bb__pgsreader(
977 int FAST_FUNC (*parserfunc)(void *d, char *line),
978 void *data,
979 char *__restrict line_buff,
980 size_t buflen,
981 FILE *f)
982{
983 int skip;
984 int rv = ERANGE;
985
986 if (buflen < PWD_BUFFER_SIZE) {
987 errno = rv;
988 return rv;
989 }
990
991 skip = 0;
992 while (1) {
993 if (!fgets(line_buff, buflen, f)) {
994 if (feof(f)) {
995 rv = ENOENT;
996 }
997 break;
998 }
999
1000 {
1001 int line_len = strlen(line_buff) - 1;
1002 if (line_len >= 0 && line_buff[line_len] == '\n') {
1003 line_buff[line_len] = '\0';
1004 } else
1005 if (line_len + 2 == buflen) {
1006 /* A start (or continuation) of overlong line */
1007 skip = 1;
1008 continue;
1009 } /* else: a last line in the file, and it has no '\n' */
1010 }
1011
1012 if (skip) {
1013 /* This "line" is a remainder of overlong line, ignore */
1014 skip = 0;
1015 continue;
1016 }
1017
1018 /* NOTE: glibc difference - glibc strips leading whitespace from
1019 * records. We do not allow leading whitespace. */
1020
1021 /* Skip empty lines, comment lines, and lines with leading
1022 * whitespace. */
1023 if (line_buff[0] != '\0' && line_buff[0] != '#' && !isspace(line_buff[0])) {
1024 if (parserfunc == bb__parsegrent) {
1025 /* Do evil group hack:
1026 * The group entry parsing function needs to know where
1027 * the end of the buffer is so that it can construct the
1028 * group member ptr table. */
1029 ((struct group *) data)->gr_name = line_buff + buflen;
1030 }
1031 if (parserfunc(data, line_buff) == 0) {
1032 rv = 0;
1033 break;
1034 }
1035 }
1036 } /* while (1) */
1037
1038 return rv;
1039}
Note: See TracBrowser for help on using the repository browser.