Add nsswitch support.
[dragonfly.git] / lib / libc / gen / getgrent.c
1 /*-
2  * Copyright (c) 2003 Networks Associates Technology, Inc.
3  * All rights reserved.
4  *
5  * This software was developed for the FreeBSD Project by
6  * Jacques A. Vidrine, Safeport Network Services, and Network
7  * Associates Laboratories, the Security Research Division of Network
8  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
9  * ("CBOSS"), as part of the DARPA CHATS research program.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * $FreeBSD: src/lib/libc/gen/getgrent.c,v 1.37 2007/12/12 10:08:02 bushman Exp $
33  * $DragonFly: src/lib/libc/gen/getgrent.c,v 1.5 2005/11/19 22:32:53 swildner Exp $
34  */
35
36 #include "namespace.h"
37 #include <sys/param.h>
38 #ifdef YP
39 #include <rpc/rpc.h>
40 #include <rpcsvc/yp_prot.h>
41 #include <rpcsvc/ypclnt.h>
42 #endif
43 #include <assert.h>
44 #include <ctype.h>
45 #include <errno.h>
46 #ifdef HESIOD
47 #include <hesiod.h>
48 #endif
49 #include <grp.h>
50 #include <nsswitch.h>
51 #include <pthread.h>
52 #include <pthread_np.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <syslog.h>
57 #include <unistd.h>
58 #include "un-namespace.h"
59 #include "libc_private.h"
60 #include "nss_tls.h"
61 #ifdef NS_CACHING
62 #include "nscache.h"
63 #endif
64
65 enum constants {
66         GRP_STORAGE_INITIAL     = 1 << 10, /* 1 KByte */
67         GRP_STORAGE_MAX         = 1 << 20, /* 1 MByte */
68         SETGRENT                = 1,
69         ENDGRENT                = 2,
70         HESIOD_NAME_MAX         = 256,
71 };
72
73 static const ns_src defaultsrc[] = {
74         { NSSRC_COMPAT, NS_SUCCESS },
75         { NULL, 0 }
76 };
77
78 int      __gr_match_entry(const char *, size_t, enum nss_lookup_type,
79             const char *, gid_t);
80 int      __gr_parse_entry(char *, size_t, struct group *, char *, size_t,
81             int *);
82
83 static  int      is_comment_line(const char *, size_t);
84
85 union key {
86         const char      *name;
87         gid_t            gid;
88 };
89 static  struct group *getgr(int (*)(union key, struct group *, char *, size_t,
90                     struct group **), union key);
91 static  int      wrap_getgrnam_r(union key, struct group *, char *, size_t,
92                     struct group **);
93 static  int      wrap_getgrgid_r(union key, struct group *, char *, size_t,
94                     struct group **);
95 static  int      wrap_getgrent_r(union key, struct group *, char *, size_t,
96                     struct group **);
97
98 struct files_state {
99         FILE    *fp;
100         int      stayopen;
101 };
102 static  void     files_endstate(void *);
103 NSS_TLS_HANDLING(files);
104 static  int      files_setgrent(void *, void *, va_list);
105 static  int      files_group(void *, void *, va_list);
106
107
108 #ifdef HESIOD
109 struct dns_state {
110         long    counter;
111 };
112 static  void     dns_endstate(void *);
113 NSS_TLS_HANDLING(dns);
114 static  int      dns_setgrent(void *, void *, va_list);
115 static  int      dns_group(void *, void *, va_list);
116 #endif
117
118
119 #ifdef YP
120 struct nis_state {
121         char     domain[MAXHOSTNAMELEN];
122         int      done;
123         char    *key;
124         int      keylen;
125 };
126 static  void     nis_endstate(void *);
127 NSS_TLS_HANDLING(nis);
128 static  int      nis_setgrent(void *, void *, va_list);
129 static  int      nis_group(void *, void *, va_list);
130 #endif
131
132 struct compat_state {
133         FILE    *fp;
134         int      stayopen;
135         char    *name;
136         enum _compat {
137                 COMPAT_MODE_OFF = 0,
138                 COMPAT_MODE_ALL,
139                 COMPAT_MODE_NAME
140         }        compat;
141 };
142 static  void     compat_endstate(void *);
143 NSS_TLS_HANDLING(compat);
144 static  int      compat_setgrent(void *, void *, va_list);
145 static  int      compat_group(void *, void *, va_list);
146
147 static  int     gr_addgid(gid_t, gid_t *, int, int *);
148 static  int     getgroupmembership_fallback(void *, void *, va_list);
149
150 #ifdef NS_CACHING
151 static  int      grp_id_func(char *, size_t *, va_list, void *);
152 static  int      grp_marshal_func(char *, size_t *, void *, va_list, void *);
153 static  int      grp_unmarshal_func(char *, size_t, void *, va_list, void *);
154
155 static int
156 grp_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
157 {
158         char    *name;
159         gid_t   gid;
160
161         size_t  desired_size, size;
162         int     res = NS_UNAVAIL;
163         enum nss_lookup_type lookup_type;
164
165
166         lookup_type = (enum nss_lookup_type)cache_mdata;
167         switch (lookup_type) {
168         case nss_lt_name:
169                 name = va_arg(ap, char *);
170                 size = strlen(name);
171                 desired_size = sizeof(enum nss_lookup_type) + size + 1;
172                 if (desired_size > *buffer_size) {
173                         res = NS_RETURN;
174                         goto fin;
175                 }
176
177                 memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
178                 memcpy(buffer + sizeof(enum nss_lookup_type), name, size + 1);
179
180                 res = NS_SUCCESS;
181                 break;
182         case nss_lt_id:
183                 gid = va_arg(ap, gid_t);
184                 desired_size = sizeof(enum nss_lookup_type) + sizeof(gid_t);
185                 if (desired_size > *buffer_size) {
186                         res = NS_RETURN;
187                         goto fin;
188                 }
189
190                 memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
191                 memcpy(buffer + sizeof(enum nss_lookup_type), &gid,
192                     sizeof(gid_t));
193
194                 res = NS_SUCCESS;
195                 break;
196         default:
197                 /* should be unreachable */
198                 return (NS_UNAVAIL);
199         }
200
201 fin:
202         *buffer_size = desired_size;
203         return (res);
204 }
205
206 static int
207 grp_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
208     void *cache_mdata)
209 {
210         char *name;
211         gid_t gid;
212         struct group *grp;
213         char *orig_buf;
214         size_t orig_buf_size;
215
216         struct group new_grp;
217         size_t desired_size, size, mem_size;
218         char *p, **mem;
219
220         switch ((enum nss_lookup_type)cache_mdata) {
221         case nss_lt_name:
222                 name = va_arg(ap, char *);
223                 break;
224         case nss_lt_id:
225                 gid = va_arg(ap, gid_t);
226                 break;
227         case nss_lt_all:
228                 break;
229         default:
230                 /* should be unreachable */
231                 return (NS_UNAVAIL);
232         }
233
234         grp = va_arg(ap, struct group *);
235         orig_buf = va_arg(ap, char *);
236         orig_buf_size = va_arg(ap, size_t);
237
238         desired_size = _ALIGNBYTES + sizeof(struct group) + sizeof(char *);
239
240         if (grp->gr_name != NULL)
241                 desired_size += strlen(grp->gr_name) + 1;
242         if (grp->gr_passwd != NULL)
243                 desired_size += strlen(grp->gr_passwd) + 1;
244
245         if (grp->gr_mem != NULL) {
246                 mem_size = 0;
247                 for (mem = grp->gr_mem; *mem; ++mem) {
248                         desired_size += strlen(*mem) + 1;
249                         ++mem_size;
250                 }
251
252                 desired_size += _ALIGNBYTES + (mem_size + 1) * sizeof(char *);
253         }
254
255         if (desired_size > *buffer_size) {
256                 /* this assignment is here for future use */
257                 *buffer_size = desired_size;
258                 return (NS_RETURN);
259         }
260
261         memcpy(&new_grp, grp, sizeof(struct group));
262         memset(buffer, 0, desired_size);
263
264         *buffer_size = desired_size;
265         p = buffer + sizeof(struct group) + sizeof(char *);
266         memcpy(buffer + sizeof(struct group), &p, sizeof(char *));
267         p = (char *)_ALIGN(p);
268
269         if (new_grp.gr_name != NULL) {
270                 size = strlen(new_grp.gr_name);
271                 memcpy(p, new_grp.gr_name, size);
272                 new_grp.gr_name = p;
273                 p += size + 1;
274         }
275
276         if (new_grp.gr_passwd != NULL) {
277                 size = strlen(new_grp.gr_passwd);
278                 memcpy(p, new_grp.gr_passwd, size);
279                 new_grp.gr_passwd = p;
280                 p += size + 1;
281         }
282
283         if (new_grp.gr_mem != NULL) {
284                 p = (char *)_ALIGN(p);
285                 memcpy(p, new_grp.gr_mem, sizeof(char *) * mem_size);
286                 new_grp.gr_mem = (char **)p;
287                 p += sizeof(char *) * (mem_size + 1);
288
289                 for (mem = new_grp.gr_mem; *mem; ++mem) {
290                         size = strlen(*mem);
291                         memcpy(p, *mem, size);
292                         *mem = p;
293                         p += size + 1;
294                 }
295         }
296
297         memcpy(buffer, &new_grp, sizeof(struct group));
298         return (NS_SUCCESS);
299 }
300
301 static int
302 grp_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
303     void *cache_mdata)
304 {
305         char *name;
306         gid_t gid;
307         struct group *grp;
308         char *orig_buf;
309         size_t orig_buf_size;
310         int *ret_errno;
311
312         char *p;
313         char **mem;
314
315         switch ((enum nss_lookup_type)cache_mdata) {
316         case nss_lt_name:
317                 name = va_arg(ap, char *);
318                 break;
319         case nss_lt_id:
320                 gid = va_arg(ap, gid_t);
321                 break;
322         case nss_lt_all:
323                 break;
324         default:
325                 /* should be unreachable */
326                 return (NS_UNAVAIL);
327         }
328
329         grp = va_arg(ap, struct group *);
330         orig_buf = va_arg(ap, char *);
331         orig_buf_size = va_arg(ap, size_t);
332         ret_errno = va_arg(ap, int *);
333
334         if (orig_buf_size <
335             buffer_size - sizeof(struct group) - sizeof(char *)) {
336                 *ret_errno = ERANGE;
337                 return (NS_RETURN);
338         }
339
340         memcpy(grp, buffer, sizeof(struct group));
341         memcpy(&p, buffer + sizeof(struct group), sizeof(char *));
342
343         orig_buf = (char *)_ALIGN(orig_buf);
344         memcpy(orig_buf, buffer + sizeof(struct group) + sizeof(char *) +
345             _ALIGN(p) - (size_t)p,
346             buffer_size - sizeof(struct group) - sizeof(char *) -
347             _ALIGN(p) + (size_t)p);
348         p = (char *)_ALIGN(p);
349
350         NS_APPLY_OFFSET(grp->gr_name, orig_buf, p, char *);
351         NS_APPLY_OFFSET(grp->gr_passwd, orig_buf, p, char *);
352         if (grp->gr_mem != NULL) {
353                 NS_APPLY_OFFSET(grp->gr_mem, orig_buf, p, char **);
354
355                 for (mem = grp->gr_mem; *mem; ++mem)
356                         NS_APPLY_OFFSET(*mem, orig_buf, p, char *);
357         }
358
359         if (retval != NULL)
360                 *((struct group **)retval) = grp;
361
362         return (NS_SUCCESS);
363 }
364
365 NSS_MP_CACHE_HANDLING(group);
366 #endif /* NS_CACHING */
367
368 #ifdef NS_CACHING
369 static const nss_cache_info setgrent_cache_info = NS_MP_CACHE_INFO_INITIALIZER(
370         group, (void *)nss_lt_all,
371         NULL, NULL);
372 #endif
373
374 static const ns_dtab setgrent_dtab[] = {
375         { NSSRC_FILES, files_setgrent, (void *)SETGRENT },
376 #ifdef HESIOD
377         { NSSRC_DNS, dns_setgrent, (void *)SETGRENT },
378 #endif
379 #ifdef YP
380         { NSSRC_NIS, nis_setgrent, (void *)SETGRENT },
381 #endif
382         { NSSRC_COMPAT, compat_setgrent, (void *)SETGRENT },
383 #ifdef NS_CACHING
384         NS_CACHE_CB(&setgrent_cache_info)
385 #endif
386         { NULL, NULL, NULL }
387 };
388
389 #ifdef NS_CACHING
390 static const nss_cache_info endgrent_cache_info = NS_MP_CACHE_INFO_INITIALIZER(
391         group, (void *)nss_lt_all,
392         NULL, NULL);
393 #endif
394
395 static const ns_dtab endgrent_dtab[] = {
396         { NSSRC_FILES, files_setgrent, (void *)ENDGRENT },
397 #ifdef HESIOD
398         { NSSRC_DNS, dns_setgrent, (void *)ENDGRENT },
399 #endif
400 #ifdef YP
401         { NSSRC_NIS, nis_setgrent, (void *)ENDGRENT },
402 #endif
403         { NSSRC_COMPAT, compat_setgrent, (void *)ENDGRENT },
404 #ifdef NS_CACHING
405         NS_CACHE_CB(&endgrent_cache_info)
406 #endif
407         { NULL, NULL, NULL }
408 };
409
410 #ifdef NS_CACHING
411 static const nss_cache_info getgrent_r_cache_info = NS_MP_CACHE_INFO_INITIALIZER(
412         group, (void *)nss_lt_all,
413         grp_marshal_func, grp_unmarshal_func);
414 #endif
415
416 static const ns_dtab getgrent_r_dtab[] = {
417         { NSSRC_FILES, files_group, (void *)nss_lt_all },
418 #ifdef HESIOD
419         { NSSRC_DNS, dns_group, (void *)nss_lt_all },
420 #endif
421 #ifdef YP
422         { NSSRC_NIS, nis_group, (void *)nss_lt_all },
423 #endif
424         { NSSRC_COMPAT, compat_group, (void *)nss_lt_all },
425 #ifdef NS_CACHING
426         NS_CACHE_CB(&getgrent_r_cache_info)
427 #endif
428         { NULL, NULL, NULL }
429 };
430
431 static int
432 gr_addgid(gid_t gid, gid_t *groups, int maxgrp, int *grpcnt)
433 {
434         int     ret, dupc;
435
436         for (dupc = 0; dupc < MIN(maxgrp, *grpcnt); dupc++) {
437                 if (groups[dupc] == gid)
438                         return 1;
439         }
440
441         ret = 1;
442         if (*grpcnt < maxgrp)
443                 groups[*grpcnt] = gid;
444         else
445                 ret = 0;
446
447         (*grpcnt)++;
448
449         return ret;
450 }
451
452 static int
453 getgroupmembership_fallback(void *retval, void *mdata, va_list ap)
454 {
455         const ns_src src[] = {
456                 { mdata, NS_SUCCESS },
457                 { NULL, 0}
458         };
459         struct group    grp;
460         struct group    *grp_p;
461         char            *buf;
462         size_t          bufsize;
463         const char      *uname;
464         gid_t           *groups;
465         gid_t           agroup;
466         int             maxgrp, *grpcnt;
467         int             i, rv, ret_errno;
468
469         /*
470          * As this is a fallback method, only provided src
471          * list will be respected during methods search.
472          */
473         assert(src[0].name != NULL);
474
475         uname = va_arg(ap, const char *);
476         agroup = va_arg(ap, gid_t);
477         groups = va_arg(ap, gid_t *);
478         maxgrp = va_arg(ap, int);
479         grpcnt = va_arg(ap, int *);
480
481         rv = NS_UNAVAIL;
482
483         buf = malloc(GRP_STORAGE_INITIAL);
484         if (buf == NULL)
485                 goto out;
486
487         bufsize = GRP_STORAGE_INITIAL;
488
489         gr_addgid(agroup, groups, maxgrp, grpcnt);
490
491         _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", src, 0);
492         for (;;) {
493                 do {
494                         ret_errno = 0;
495                         grp_p = NULL;
496                         rv = _nsdispatch(&grp_p, getgrent_r_dtab, NSDB_GROUP,
497                             "getgrent_r", src, &grp, buf, bufsize, &ret_errno);
498
499                         if (grp_p == NULL && ret_errno == ERANGE) {
500                                 free(buf);
501                                 if ((bufsize << 1) > GRP_STORAGE_MAX) {
502                                         buf = NULL;
503                                         errno = ERANGE;
504                                         goto out;
505                                 }
506
507                                 bufsize <<= 1;
508                                 buf = malloc(bufsize);
509                                 if (buf == NULL) {
510                                         goto out;
511                                 }
512                         }
513                 } while (grp_p == NULL && ret_errno == ERANGE);
514
515                 if (ret_errno != 0) {
516                         errno = ret_errno;
517                         goto out;
518                 }
519
520                 if (grp_p == NULL)
521                         break;
522
523                 for (i = 0; grp.gr_mem[i]; i++) {
524                         if (strcmp(grp.gr_mem[i], uname) == 0)
525                             gr_addgid(grp.gr_gid, groups, maxgrp, grpcnt);
526                 }
527         }
528
529         _nsdispatch(NULL, endgrent_dtab, NSDB_GROUP, "endgrent", src);
530 out:
531         free(buf);
532         return (rv);
533 }
534
535 /* XXX IEEE Std 1003.1, 2003 specifies `void setgrent(void)' */
536 int
537 setgrent(void)
538 {
539         _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc, 0);
540         return (1);
541 }
542
543
544 int
545 setgroupent(int stayopen)
546 {
547         _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc,
548             stayopen);
549         return (1);
550 }
551
552
553 void
554 endgrent(void)
555 {
556         _nsdispatch(NULL, endgrent_dtab, NSDB_GROUP, "endgrent", defaultsrc);
557 }
558
559
560 int
561 getgrent_r(struct group *grp, char *buffer, size_t bufsize,
562     struct group **result)
563 {
564         int     rv, ret_errno;
565
566         ret_errno = 0;
567         *result = NULL;
568         rv = _nsdispatch(result, getgrent_r_dtab, NSDB_GROUP, "getgrent_r", defaultsrc,
569             grp, buffer, bufsize, &ret_errno);
570         if (rv == NS_SUCCESS)
571                 return (0);
572         else
573                 return (ret_errno);
574 }
575
576
577 int
578 getgrnam_r(const char *name, struct group *grp, char *buffer, size_t bufsize,
579     struct group **result)
580 {
581 #ifdef NS_CACHING
582         static const nss_cache_info cache_info =
583                 NS_COMMON_CACHE_INFO_INITIALIZER(
584                 group, (void *)nss_lt_name,
585                 grp_id_func, grp_marshal_func, grp_unmarshal_func);
586 #endif
587
588         static const ns_dtab dtab[] = {
589                 { NSSRC_FILES, files_group, (void *)nss_lt_name },
590 #ifdef HESIOD
591                 { NSSRC_DNS, dns_group, (void *)nss_lt_name },
592 #endif
593 #ifdef YP
594                 { NSSRC_NIS, nis_group, (void *)nss_lt_name },
595 #endif
596                 { NSSRC_COMPAT, compat_group, (void *)nss_lt_name },
597 #ifdef NS_CACHING
598                 NS_CACHE_CB(&cache_info)
599 #endif
600                 { NULL, NULL, NULL }
601         };
602         int     rv, ret_errno;
603
604         ret_errno = 0;
605         *result = NULL;
606         rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrnam_r", defaultsrc,
607             name, grp, buffer, bufsize, &ret_errno);
608         if (rv == NS_SUCCESS)
609                 return (0);
610         else
611                 return (ret_errno);
612 }
613
614
615 int
616 getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize,
617     struct group **result)
618 {
619 #ifdef NS_CACHING
620         static const nss_cache_info cache_info =
621                 NS_COMMON_CACHE_INFO_INITIALIZER(
622                 group, (void *)nss_lt_id,
623                 grp_id_func, grp_marshal_func, grp_unmarshal_func);
624 #endif
625
626         static const ns_dtab dtab[] = {
627                 { NSSRC_FILES, files_group, (void *)nss_lt_id },
628 #ifdef HESIOD
629                 { NSSRC_DNS, dns_group, (void *)nss_lt_id },
630 #endif
631 #ifdef YP
632                 { NSSRC_NIS, nis_group, (void *)nss_lt_id },
633 #endif
634                 { NSSRC_COMPAT, compat_group, (void *)nss_lt_id },
635 #ifdef NS_CACHING
636                 NS_CACHE_CB(&cache_info)
637 #endif
638                 { NULL, NULL, NULL }
639         };
640         int     rv, ret_errno;
641
642         ret_errno = 0;
643         *result = NULL;
644         rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrgid_r", defaultsrc,
645             gid, grp, buffer, bufsize, &ret_errno);
646         if (rv == NS_SUCCESS)
647                 return (0);
648         else
649                 return (ret_errno);
650 }
651
652
653
654 int
655 __getgroupmembership(const char *uname, gid_t agroup, gid_t *groups,
656         int maxgrp, int *grpcnt)
657 {
658         static const ns_dtab dtab[] = {
659                 NS_FALLBACK_CB(getgroupmembership_fallback)
660                 { NULL, NULL, NULL }
661         };
662         int rv;
663
664         assert(uname != NULL);
665         /* groups may be NULL if just sizing when invoked with maxgrp = 0 */
666         assert(grpcnt != NULL);
667
668         *grpcnt = 0;
669         rv = _nsdispatch(NULL, dtab, NSDB_GROUP, "getgroupmembership",
670             defaultsrc, uname, agroup, groups, maxgrp, grpcnt);
671
672         /* too many groups found? */
673         return (*grpcnt > maxgrp ? -1 : 0);
674 }
675
676
677 static struct group      grp;
678 static char             *grp_storage;
679 static size_t            grp_storage_size;
680
681 static struct group *
682 getgr(int (*fn)(union key, struct group *, char *, size_t, struct group **),
683     union key key)
684 {
685         int              rv;
686         struct group    *res;
687
688         if (grp_storage == NULL) {
689                 grp_storage = malloc(GRP_STORAGE_INITIAL);
690                 if (grp_storage == NULL)
691                         return (NULL);
692                 grp_storage_size = GRP_STORAGE_INITIAL;
693         }
694         do {
695                 rv = fn(key, &grp, grp_storage, grp_storage_size, &res);
696                 if (res == NULL && rv == ERANGE) {
697                         free(grp_storage);
698                         if ((grp_storage_size << 1) > GRP_STORAGE_MAX) {
699                                 grp_storage = NULL;
700                                 errno = ERANGE;
701                                 return (NULL);
702                         }
703                         grp_storage_size <<= 1;
704                         grp_storage = malloc(grp_storage_size);
705                         if (grp_storage == NULL)
706                                 return (NULL);
707                 }
708         } while (res == NULL && rv == ERANGE);
709         if (rv != 0)
710                 errno = rv;
711         return (res);
712 }
713
714
715 static int
716 wrap_getgrnam_r(union key key, struct group *grp, char *buffer, size_t bufsize,
717     struct group **res)
718 {
719         return (getgrnam_r(key.name, grp, buffer, bufsize, res));
720 }
721
722
723 static int
724 wrap_getgrgid_r(union key key, struct group *grp, char *buffer, size_t bufsize,
725     struct group **res)
726 {
727         return (getgrgid_r(key.gid, grp, buffer, bufsize, res));
728 }
729
730
731 static int
732 wrap_getgrent_r(union key key __unused, struct group *grp, char *buffer,
733     size_t bufsize, struct group **res)
734 {
735         return (getgrent_r(grp, buffer, bufsize, res));
736 }
737
738
739 struct group *
740 getgrnam(const char *name)
741 {
742         union key key;
743
744         key.name = name;
745         return (getgr(wrap_getgrnam_r, key));
746 }
747
748
749 struct group *
750 getgrgid(gid_t gid)
751 {
752         union key key;
753
754         key.gid = gid;
755         return (getgr(wrap_getgrgid_r, key));
756 }
757
758
759 struct group *
760 getgrent(void)
761 {
762         union key key;
763
764         key.gid = 0; /* not used */
765         return (getgr(wrap_getgrent_r, key));
766 }
767
768
769 static int
770 is_comment_line(const char *s, size_t n)
771 {
772         const char      *eom;
773
774         eom = &s[n];
775
776         for (; s < eom; s++)
777                 if (*s == '#' || !isspace((unsigned char)*s))
778                         break;
779         return (*s == '#' || s == eom);
780 }
781
782
783 /*
784  * files backend
785  */
786 static void
787 files_endstate(void *p)
788 {
789
790         if (p == NULL)
791                 return;
792         if (((struct files_state *)p)->fp != NULL)
793                 fclose(((struct files_state *)p)->fp);
794         free(p);
795 }
796
797
798 static int
799 files_setgrent(void *retval, void *mdata, va_list ap)
800 {
801         struct files_state *st;
802         int              rv, stayopen;
803
804         rv = files_getstate(&st);
805         if (rv != 0)
806                 return (NS_UNAVAIL);
807         switch ((enum constants)mdata) {
808         case SETGRENT:
809                 stayopen = va_arg(ap, int);
810                 if (st->fp != NULL)
811                         rewind(st->fp);
812                 else if (stayopen)
813                         st->fp = fopen(_PATH_GROUP, "r");
814                 break;
815         case ENDGRENT:
816                 if (st->fp != NULL) {
817                         fclose(st->fp);
818                         st->fp = NULL;
819                 }
820                 break;
821         default:
822                 break;
823         }
824         return (NS_UNAVAIL);
825 }
826
827
828 static int
829 files_group(void *retval, void *mdata, va_list ap)
830 {
831         struct files_state      *st;
832         enum nss_lookup_type     how;
833         const char              *name, *line;
834         struct group            *grp;
835         gid_t                    gid;
836         char                    *buffer;
837         size_t                   bufsize, linesize;
838         off_t                    pos;
839         int                      rv, stayopen, *errnop;
840
841         name = NULL;
842         gid = (gid_t)-1;
843         how = (enum nss_lookup_type)mdata;
844         switch (how) {
845         case nss_lt_name:
846                 name = va_arg(ap, const char *);
847                 break;
848         case nss_lt_id:
849                 gid = va_arg(ap, gid_t);
850                 break;
851         case nss_lt_all:
852                 break;
853         default:
854                 return (NS_NOTFOUND);
855         }
856         grp = va_arg(ap, struct group *);
857         buffer = va_arg(ap, char *);
858         bufsize = va_arg(ap, size_t);
859         errnop = va_arg(ap, int *);
860         *errnop = files_getstate(&st);
861         if (*errnop != 0)
862                 return (NS_UNAVAIL);
863         if (st->fp == NULL &&
864             ((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) {
865                 *errnop = errno;
866                 return (NS_UNAVAIL);
867         }
868         if (how == nss_lt_all)
869                 stayopen = 1;
870         else {
871                 rewind(st->fp);
872                 stayopen = st->stayopen;
873         }
874         rv = NS_NOTFOUND;
875         pos = ftello(st->fp);
876         while ((line = fgetln(st->fp, &linesize)) != NULL) {
877                 if (line[linesize-1] == '\n')
878                         linesize--;
879                 rv = __gr_match_entry(line, linesize, how, name, gid);
880                 if (rv != NS_SUCCESS)
881                         continue;
882                 /* We need room at least for the line, a string NUL
883                  * terminator, alignment padding, and one (char *)
884                  * pointer for the member list terminator.
885                  */
886                 if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
887                         *errnop = ERANGE;
888                         rv = NS_RETURN;
889                         break;
890                 }
891                 memcpy(buffer, line, linesize);
892                 buffer[linesize] = '\0';
893                 rv = __gr_parse_entry(buffer, linesize, grp,
894                     &buffer[linesize + 1], bufsize - linesize - 1, errnop);
895                 if (rv & NS_TERMINATE)
896                         break;
897                 pos = ftello(st->fp);
898         }
899         if (!stayopen && st->fp != NULL) {
900                 fclose(st->fp);
901                 st->fp = NULL;
902         }
903         if (rv == NS_SUCCESS && retval != NULL)
904                 *(struct group **)retval = grp;
905         else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL)
906                 fseeko(st->fp, pos, SEEK_SET);
907         return (rv);
908 }
909
910
911 #ifdef HESIOD
912 /*
913  * dns backend
914  */
915 static void
916 dns_endstate(void *p)
917 {
918
919         free(p);
920 }
921
922
923 static int
924 dns_setgrent(void *retval, void *cb_data, va_list ap)
925 {
926         struct dns_state        *st;
927         int                      rv;
928
929         rv = dns_getstate(&st);
930         if (rv != 0)
931                 return (NS_UNAVAIL);
932         st->counter = 0;
933         return (NS_UNAVAIL);
934 }
935
936
937 static int
938 dns_group(void *retval, void *mdata, va_list ap)
939 {
940         char                     buf[HESIOD_NAME_MAX];
941         struct dns_state        *st;
942         struct group            *grp;
943         const char              *name, *label;
944         void                    *ctx;
945         char                    *buffer, **hes;
946         size_t                   bufsize, adjsize, linesize;
947         gid_t                    gid;
948         enum nss_lookup_type     how;
949         int                      rv, *errnop;
950
951         ctx = NULL;
952         hes = NULL;
953         name = NULL;
954         gid = (gid_t)-1;
955         how = (enum nss_lookup_type)mdata;
956         switch (how) {
957         case nss_lt_name:
958                 name = va_arg(ap, const char *);
959                 break;
960         case nss_lt_id:
961                 gid = va_arg(ap, gid_t);
962                 break;
963         case nss_lt_all:
964                 break;
965         }
966         grp     = va_arg(ap, struct group *);
967         buffer  = va_arg(ap, char *);
968         bufsize = va_arg(ap, size_t);
969         errnop  = va_arg(ap, int *);
970         *errnop = dns_getstate(&st);
971         if (*errnop != 0)
972                 return (NS_UNAVAIL);
973         if (hesiod_init(&ctx) != 0) {
974                 *errnop = errno;
975                 rv = NS_UNAVAIL;
976                 goto fin;
977         }
978         do {
979                 rv = NS_NOTFOUND;
980                 switch (how) {
981                 case nss_lt_name:
982                         label = name;
983                         break;
984                 case nss_lt_id:
985                         if (snprintf(buf, sizeof(buf), "%lu",
986                             (unsigned long)gid) >= sizeof(buf))
987                                 goto fin;
988                         label = buf;
989                         break;
990                 case nss_lt_all:
991                         if (st->counter < 0)
992                                 goto fin;
993                         if (snprintf(buf, sizeof(buf), "group-%ld",
994                             st->counter++) >= sizeof(buf))
995                                 goto fin;
996                         label = buf;
997                         break;
998                 }
999                 hes = hesiod_resolve(ctx, label,
1000                     how == nss_lt_id ? "gid" : "group");
1001                 if ((how == nss_lt_id && hes == NULL &&
1002                     (hes = hesiod_resolve(ctx, buf, "group")) == NULL) ||
1003                     hes == NULL) {
1004                         if (how == nss_lt_all)
1005                                 st->counter = -1;
1006                         if (errno != ENOENT)
1007                                 *errnop = errno;
1008                         goto fin;
1009                 }
1010                 rv = __gr_match_entry(hes[0], strlen(hes[0]), how, name, gid);
1011                 if (rv != NS_SUCCESS) {
1012                         hesiod_free_list(ctx, hes);
1013                         hes = NULL;
1014                         continue;
1015                 }
1016                 /* We need room at least for the line, a string NUL
1017                  * terminator, alignment padding, and one (char *)
1018                  * pointer for the member list terminator.
1019                  */
1020                 adjsize = bufsize - _ALIGNBYTES - sizeof(char *);
1021                 linesize = strlcpy(buffer, hes[0], adjsize);
1022                 if (linesize >= adjsize) {
1023                         *errnop = ERANGE;
1024                         rv = NS_RETURN;
1025                         goto fin;
1026                 }
1027                 hesiod_free_list(ctx, hes);
1028                 hes = NULL;
1029                 rv = __gr_parse_entry(buffer, linesize, grp,
1030                     &buffer[linesize + 1], bufsize - linesize - 1, errnop);
1031         } while (how == nss_lt_all && !(rv & NS_TERMINATE));
1032 fin:
1033         if (hes != NULL)
1034                 hesiod_free_list(ctx, hes);
1035         if (ctx != NULL)
1036                 hesiod_end(ctx);
1037         if (rv == NS_SUCCESS && retval != NULL)
1038                 *(struct group **)retval = grp;
1039         return (rv);
1040 }
1041 #endif /* HESIOD */
1042
1043
1044 #ifdef YP
1045 /*
1046  * nis backend
1047  */
1048 static void
1049 nis_endstate(void *p)
1050 {
1051
1052         if (p == NULL)
1053                 return;
1054         free(((struct nis_state *)p)->key);
1055         free(p);
1056 }
1057
1058
1059 static int
1060 nis_setgrent(void *retval, void *cb_data, va_list ap)
1061 {
1062         struct nis_state        *st;
1063         int                      rv;
1064
1065         rv = nis_getstate(&st);
1066         if (rv != 0)
1067                 return (NS_UNAVAIL);
1068         st->done = 0;
1069         free(st->key);
1070         st->key = NULL;
1071         return (NS_UNAVAIL);
1072 }
1073
1074
1075 static int
1076 nis_group(void *retval, void *mdata, va_list ap)
1077 {
1078         char             *map;
1079         struct nis_state *st;
1080         struct group    *grp;
1081         const char      *name;
1082         char            *buffer, *key, *result;
1083         size_t           bufsize;
1084         gid_t            gid;
1085         enum nss_lookup_type how;
1086         int             *errnop, keylen, resultlen, rv;
1087
1088         name = NULL;
1089         gid = (gid_t)-1;
1090         how = (enum nss_lookup_type)mdata;
1091         switch (how) {
1092         case nss_lt_name:
1093                 name = va_arg(ap, const char *);
1094                 map = "group.byname";
1095                 break;
1096         case nss_lt_id:
1097                 gid = va_arg(ap, gid_t);
1098                 map = "group.bygid";
1099                 break;
1100         case nss_lt_all:
1101                 map = "group.byname";
1102                 break;
1103         }
1104         grp     = va_arg(ap, struct group *);
1105         buffer  = va_arg(ap, char *);
1106         bufsize = va_arg(ap, size_t);
1107         errnop  = va_arg(ap, int *);
1108         *errnop = nis_getstate(&st);
1109         if (*errnop != 0)
1110                 return (NS_UNAVAIL);
1111         if (st->domain[0] == '\0') {
1112                 if (getdomainname(st->domain, sizeof(st->domain)) != 0) {
1113                         *errnop = errno;
1114                         return (NS_UNAVAIL);
1115                 }
1116         }
1117         result = NULL;
1118         do {
1119                 rv = NS_NOTFOUND;
1120                 switch (how) {
1121                 case nss_lt_name:
1122                         if (strlcpy(buffer, name, bufsize) >= bufsize)
1123                                 goto erange;
1124                         break;
1125                 case nss_lt_id:
1126                         if (snprintf(buffer, bufsize, "%lu",
1127                             (unsigned long)gid) >= bufsize)
1128                                 goto erange;
1129                         break;
1130                 case nss_lt_all:
1131                         if (st->done)
1132                                 goto fin;
1133                         break;
1134                 }
1135                 result = NULL;
1136                 if (how == nss_lt_all) {
1137                         if (st->key == NULL)
1138                                 rv = yp_first(st->domain, map, &st->key,
1139                                     &st->keylen, &result, &resultlen);
1140                         else {
1141                                 key = st->key;
1142                                 keylen = st->keylen;
1143                                 st->key = NULL;
1144                                 rv = yp_next(st->domain, map, key, keylen,
1145                                     &st->key, &st->keylen, &result,
1146                                     &resultlen);
1147                                 free(key);
1148                         }
1149                         if (rv != 0) {
1150                                 free(result);
1151                                 free(st->key);
1152                                 st->key = NULL;
1153                                 if (rv == YPERR_NOMORE) {
1154                                         st->done = 1;
1155                                         rv = NS_NOTFOUND;
1156                                 } else
1157                                         rv = NS_UNAVAIL;
1158                                 goto fin;
1159                         }
1160                 } else {
1161                         rv = yp_match(st->domain, map, buffer, strlen(buffer),
1162                             &result, &resultlen);
1163                         if (rv == YPERR_KEY) {
1164                                 rv = NS_NOTFOUND;
1165                                 continue;
1166                         } else if (rv != 0) {
1167                                 free(result);
1168                                 rv = NS_UNAVAIL;
1169                                 continue;
1170                         }
1171                 }
1172                 /* We need room at least for the line, a string NUL
1173                  * terminator, alignment padding, and one (char *)
1174                  * pointer for the member list terminator.
1175                  */
1176                 if (resultlen >= bufsize - _ALIGNBYTES - sizeof(char *))
1177                         goto erange;
1178                 memcpy(buffer, result, resultlen);
1179                 buffer[resultlen] = '\0';
1180                 free(result);
1181                 rv = __gr_match_entry(buffer, resultlen, how, name, gid);
1182                 if (rv == NS_SUCCESS)
1183                         rv = __gr_parse_entry(buffer, resultlen, grp,
1184                             &buffer[resultlen+1], bufsize - resultlen - 1,
1185                             errnop);
1186         } while (how == nss_lt_all && !(rv & NS_TERMINATE));
1187 fin:
1188         if (rv == NS_SUCCESS && retval != NULL)
1189                 *(struct group **)retval = grp;
1190         return (rv);
1191 erange:
1192         *errnop = ERANGE;
1193         return (NS_RETURN);
1194 }
1195 #endif /* YP */
1196
1197
1198
1199 /*
1200  * compat backend
1201  */
1202 static void
1203 compat_endstate(void *p)
1204 {
1205         struct compat_state *st;
1206
1207         if (p == NULL)
1208                 return;
1209         st = (struct compat_state *)p;
1210         free(st->name);
1211         if (st->fp != NULL)
1212                 fclose(st->fp);
1213         free(p);
1214 }
1215
1216
1217 static int
1218 compat_setgrent(void *retval, void *mdata, va_list ap)
1219 {
1220         static const ns_src compatsrc[] = {
1221 #ifdef YP
1222                 { NSSRC_NIS, NS_SUCCESS },
1223 #endif
1224                 { NULL, 0 }
1225         };
1226         ns_dtab dtab[] = {
1227 #ifdef HESIOD
1228                 { NSSRC_DNS, dns_setgrent, NULL },
1229 #endif
1230 #ifdef YP
1231                 { NSSRC_NIS, nis_setgrent, NULL },
1232 #endif
1233                 { NULL, NULL, NULL }
1234         };
1235         struct compat_state *st;
1236         int              rv, stayopen;
1237
1238 #define set_setent(x, y) do {                                   \
1239         int i;                                                  \
1240                                                                 \
1241         for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++)      \
1242                 x[i].mdata = (void *)y;                         \
1243 } while (0)
1244
1245         rv = compat_getstate(&st);
1246         if (rv != 0)
1247                 return (NS_UNAVAIL);
1248         switch ((enum constants)mdata) {
1249         case SETGRENT:
1250                 stayopen = va_arg(ap, int);
1251                 if (st->fp != NULL)
1252                         rewind(st->fp);
1253                 else if (stayopen)
1254                         st->fp = fopen(_PATH_GROUP, "r");
1255                 set_setent(dtab, mdata);
1256                 _nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "setgrent",
1257                     compatsrc, 0);
1258                 break;
1259         case ENDGRENT:
1260                 if (st->fp != NULL) {
1261                         fclose(st->fp);
1262                         st->fp = NULL;
1263                 }
1264                 set_setent(dtab, mdata);
1265                 _nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "endgrent",
1266                     compatsrc, 0);
1267                 break;
1268         default:
1269                 break;
1270         }
1271         st->compat = COMPAT_MODE_OFF;
1272         free(st->name);
1273         st->name = NULL;
1274         return (NS_UNAVAIL);
1275 #undef set_setent
1276 }
1277
1278
1279 static int
1280 compat_group(void *retval, void *mdata, va_list ap)
1281 {
1282         static const ns_src compatsrc[] = {
1283 #ifdef YP
1284                 { NSSRC_NIS, NS_SUCCESS },
1285 #endif
1286                 { NULL, 0 }
1287         };
1288         ns_dtab dtab[] = {
1289 #ifdef YP
1290                 { NSSRC_NIS, nis_group, NULL },
1291 #endif
1292 #ifdef HESIOD
1293                 { NSSRC_DNS, dns_group, NULL },
1294 #endif
1295                 { NULL, NULL, NULL }
1296         };
1297         struct compat_state     *st;
1298         enum nss_lookup_type     how;
1299         const char              *name, *line;
1300         struct group            *grp;
1301         gid_t                    gid;
1302         char                    *buffer, *p;
1303         void                    *discard;
1304         size_t                   bufsize, linesize;
1305         off_t                    pos;
1306         int                      rv, stayopen, *errnop;
1307
1308 #define set_lookup_type(x, y) do {                              \
1309         int i;                                                  \
1310                                                                 \
1311         for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++)      \
1312                 x[i].mdata = (void *)y;                         \
1313 } while (0)
1314
1315         name = NULL;
1316         gid = (gid_t)-1;
1317         how = (enum nss_lookup_type)mdata;
1318         switch (how) {
1319         case nss_lt_name:
1320                 name = va_arg(ap, const char *);
1321                 break;
1322         case nss_lt_id:
1323                 gid = va_arg(ap, gid_t);
1324                 break;
1325         case nss_lt_all:
1326                 break;
1327         default:
1328                 return (NS_NOTFOUND);
1329         }
1330         grp = va_arg(ap, struct group *);
1331         buffer = va_arg(ap, char *);
1332         bufsize = va_arg(ap, size_t);
1333         errnop = va_arg(ap, int *);
1334         *errnop = compat_getstate(&st);
1335         if (*errnop != 0)
1336                 return (NS_UNAVAIL);
1337         if (st->fp == NULL &&
1338             ((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) {
1339                 *errnop = errno;
1340                 rv = NS_UNAVAIL;
1341                 goto fin;
1342         }
1343         if (how == nss_lt_all)
1344                 stayopen = 1;
1345         else {
1346                 rewind(st->fp);
1347                 stayopen = st->stayopen;
1348         }
1349 docompat:
1350         switch (st->compat) {
1351         case COMPAT_MODE_ALL:
1352                 set_lookup_type(dtab, how);
1353                 switch (how) {
1354                 case nss_lt_all:
1355                         rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1356                             "getgrent_r", compatsrc, grp, buffer, bufsize,
1357                             errnop);
1358                         break;
1359                 case nss_lt_id:
1360                         rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1361                             "getgrgid_r", compatsrc, gid, grp, buffer, bufsize,
1362                             errnop);
1363                         break;
1364                 case nss_lt_name:
1365                         rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1366                             "getgrnam_r", compatsrc, name, grp, buffer,
1367                             bufsize, errnop);
1368                         break;
1369                 }
1370                 if (rv & NS_TERMINATE)
1371                         goto fin;
1372                 st->compat = COMPAT_MODE_OFF;
1373                 break;
1374         case COMPAT_MODE_NAME:
1375                 set_lookup_type(dtab, nss_lt_name);
1376                 rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1377                     "getgrnam_r", compatsrc, st->name, grp, buffer, bufsize,
1378                     errnop);
1379                 switch (rv) {
1380                 case NS_SUCCESS:
1381                         switch (how) {
1382                         case nss_lt_name:
1383                                 if (strcmp(name, grp->gr_name) != 0)
1384                                         rv = NS_NOTFOUND;
1385                                 break;
1386                         case nss_lt_id:
1387                                 if (gid != grp->gr_gid)
1388                                         rv = NS_NOTFOUND;
1389                                 break;
1390                         default:
1391                                 break;
1392                         }
1393                         break;
1394                 case NS_RETURN:
1395                         goto fin;
1396                 default:
1397                         break;
1398                 }
1399                 free(st->name);
1400                 st->name = NULL;
1401                 st->compat = COMPAT_MODE_OFF;
1402                 if (rv == NS_SUCCESS)
1403                         goto fin;
1404                 break;
1405         default:
1406                 break;
1407         }
1408         rv = NS_NOTFOUND;
1409         pos = ftello(st->fp);
1410         while ((line = fgetln(st->fp, &linesize)) != NULL) {
1411                 if (line[linesize-1] == '\n')
1412                         linesize--;
1413                 if (linesize > 2 && line[0] == '+') {
1414                         p = memchr(&line[1], ':', linesize);
1415                         if (p == NULL || p == &line[1])
1416                                 st->compat = COMPAT_MODE_ALL;
1417                         else {
1418                                 st->name = malloc(p - line);
1419                                 if (st->name == NULL) {
1420                                         syslog(LOG_ERR,
1421                                          "getgrent memory allocation failure");
1422                                         *errnop = ENOMEM;
1423                                         rv = NS_UNAVAIL;
1424                                         break;
1425                                 }
1426                                 memcpy(st->name, &line[1], p - line - 1);
1427                                 st->name[p - line - 1] = '\0';
1428                                 st->compat = COMPAT_MODE_NAME;
1429                         }
1430                         goto docompat;
1431                 }
1432                 rv = __gr_match_entry(line, linesize, how, name, gid);
1433                 if (rv != NS_SUCCESS)
1434                         continue;
1435                 /* We need room at least for the line, a string NUL
1436                  * terminator, alignment padding, and one (char *)
1437                  * pointer for the member list terminator.
1438                  */
1439                 if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
1440                         *errnop = ERANGE;
1441                         rv = NS_RETURN;
1442                         break;
1443                 }
1444                 memcpy(buffer, line, linesize);
1445                 buffer[linesize] = '\0';
1446                 rv = __gr_parse_entry(buffer, linesize, grp,
1447                     &buffer[linesize + 1], bufsize - linesize - 1, errnop);
1448                 if (rv & NS_TERMINATE)
1449                         break;
1450                 pos = ftello(st->fp);
1451         }
1452 fin:
1453         if (!stayopen && st->fp != NULL) {
1454                 fclose(st->fp);
1455                 st->fp = NULL;
1456         }
1457         if (rv == NS_SUCCESS && retval != NULL)
1458                 *(struct group **)retval = grp;
1459         else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL)
1460                 fseeko(st->fp, pos, SEEK_SET);
1461         return (rv);
1462 #undef set_lookup_type
1463 }
1464
1465
1466 /*
1467  * common group line matching and parsing
1468  */
1469 int
1470 __gr_match_entry(const char *line, size_t linesize, enum nss_lookup_type how,
1471     const char *name, gid_t gid)
1472 {
1473         size_t           namesize;
1474         const char      *p, *eol;
1475         char            *q;
1476         unsigned long    n;
1477         int              i, needed;
1478
1479         if (linesize == 0 || is_comment_line(line, linesize))
1480                 return (NS_NOTFOUND);
1481         switch (how) {
1482         case nss_lt_name:       needed = 1; break;
1483         case nss_lt_id:         needed = 2; break;
1484         default:                needed = 2; break;
1485         }
1486         eol = &line[linesize];
1487         for (p = line, i = 0; i < needed && p < eol; p++)
1488                 if (*p == ':')
1489                         i++;
1490         if (i < needed)
1491                 return (NS_NOTFOUND);
1492         switch (how) {
1493         case nss_lt_name:
1494                 namesize = strlen(name);
1495                 if (namesize + 1 == (size_t)(p - line) &&
1496                     memcmp(line, name, namesize) == 0)
1497                         return (NS_SUCCESS);
1498                 break;
1499         case nss_lt_id:
1500                 n = strtoul(p, &q, 10);
1501                 if (q < eol && *q == ':' && gid == (gid_t)n)
1502                         return (NS_SUCCESS);
1503                 break;
1504         case nss_lt_all:
1505                 return (NS_SUCCESS);
1506         default:
1507                 break;
1508         }
1509         return (NS_NOTFOUND);
1510 }
1511
1512
1513 int
1514 __gr_parse_entry(char *line, size_t linesize, struct group *grp, char *membuf,
1515     size_t membufsize, int *errnop)
1516 {
1517         char           *s_gid, *s_mem, *p, **members;
1518         unsigned long   n;
1519         int             maxmembers;
1520
1521         memset(grp, 0, sizeof(*grp));
1522         members = (char **)_ALIGN(membuf);
1523         membufsize -= (char *)members - membuf;
1524         maxmembers = membufsize / sizeof(*members);
1525         if (maxmembers <= 0 ||
1526             (grp->gr_name = strsep(&line, ":")) == NULL ||
1527             grp->gr_name[0] == '\0' ||
1528             (grp->gr_passwd = strsep(&line, ":")) == NULL ||
1529             (s_gid = strsep(&line, ":")) == NULL ||
1530             s_gid[0] == '\0')
1531                 return (NS_NOTFOUND);
1532         s_mem = line;
1533         n = strtoul(s_gid, &s_gid, 10);
1534         if (s_gid[0] != '\0')
1535                 return (NS_NOTFOUND);
1536         grp->gr_gid = (gid_t)n;
1537         grp->gr_mem = members;
1538         while (maxmembers > 1 && s_mem != NULL) {
1539                 p = strsep(&s_mem, ",");
1540                 if (p != NULL && *p != '\0') {
1541                         *members++ = p;
1542                         maxmembers--;
1543                 }
1544         }
1545         *members = NULL;
1546         if (s_mem == NULL)
1547                 return (NS_SUCCESS);
1548         else {
1549                 *errnop = ERANGE;
1550                 return (NS_RETURN);
1551         }
1552 }