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 */
34
35 #include "namespace.h"
36 #include <sys/param.h>
37 #ifdef YP
38 #include <rpc/rpc.h>
39 #include <rpcsvc/yp_prot.h>
40 #include <rpcsvc/ypclnt.h>
41 #endif
42 #include <assert.h>
43 #include <ctype.h>
44 #include <errno.h>
45 #ifdef HESIOD
46 #include <hesiod.h>
47 #endif
48 #include <grp.h>
49 #include <nsswitch.h>
50 #include <pthread.h>
51 #include <pthread_np.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <syslog.h>
56 #include <unistd.h>
57 #include "un-namespace.h"
58 #include "libc_private.h"
59 #include "nss_tls.h"
60 #ifdef NS_CACHING
61 #include "nscache.h"
62 #endif
63
64 enum constants {
65 GRP_STORAGE_INITIAL = 1 << 10, /* 1 KByte */
66 GRP_STORAGE_MAX = 1 << 20, /* 1 MByte */
67 SETGRENT = 1,
68 ENDGRENT = 2,
69 HESIOD_NAME_MAX = 256,
70 };
71
72 static const ns_src defaultsrc[] = {
73 { NSSRC_COMPAT, NS_SUCCESS },
74 { NULL, 0 }
75 };
76
77 int __getgroupmembership(const char *, gid_t, gid_t *, int, int *);
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
grp_id_func(char * buffer,size_t * buffer_size,va_list ap,void * cache_mdata)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
grp_marshal_func(char * buffer,size_t * buffer_size,void * retval __unused,va_list ap,void * cache_mdata)207 grp_marshal_func(char *buffer, size_t *buffer_size, void *retval __unused,
208 va_list ap, void *cache_mdata)
209 {
210 char *name __unused;
211 gid_t gid __unused;
212 struct group *grp;
213 char *orig_buf __unused;
214 size_t orig_buf_size __unused;
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
grp_unmarshal_func(char * buffer,size_t buffer_size,void * retval,va_list ap,void * cache_mdata)302 grp_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
303 void *cache_mdata)
304 {
305 char *name __unused;
306 gid_t gid __unused;
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
gr_addgid(gid_t gid,gid_t * groups,int maxgrp,int * grpcnt)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
getgroupmembership_fallback(void * retval __unused,void * mdata,va_list ap)453 getgroupmembership_fallback(void *retval __unused, 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 void
setgrent(void)536 setgrent(void)
537 {
538 _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc, 0);
539 }
540
541
542 int
setgroupent(int stayopen)543 setgroupent(int stayopen)
544 {
545 _nsdispatch(NULL, setgrent_dtab, NSDB_GROUP, "setgrent", defaultsrc,
546 stayopen);
547 return (1);
548 }
549
550
551 void
endgrent(void)552 endgrent(void)
553 {
554 _nsdispatch(NULL, endgrent_dtab, NSDB_GROUP, "endgrent", defaultsrc);
555 }
556
557
558 int
getgrent_r(struct group * grp,char * buffer,size_t bufsize,struct group ** result)559 getgrent_r(struct group *grp, char *buffer, size_t bufsize,
560 struct group **result)
561 {
562 int rv, ret_errno;
563
564 ret_errno = 0;
565 *result = NULL;
566 rv = _nsdispatch(result, getgrent_r_dtab, NSDB_GROUP, "getgrent_r", defaultsrc,
567 grp, buffer, bufsize, &ret_errno);
568 if (rv == NS_SUCCESS)
569 return (0);
570 else
571 return (ret_errno);
572 }
573
574
575 int
getgrnam_r(const char * name,struct group * grp,char * buffer,size_t bufsize,struct group ** result)576 getgrnam_r(const char *name, struct group *grp, char *buffer, size_t bufsize,
577 struct group **result)
578 {
579 #ifdef NS_CACHING
580 static const nss_cache_info cache_info =
581 NS_COMMON_CACHE_INFO_INITIALIZER(
582 group, (void *)nss_lt_name,
583 grp_id_func, grp_marshal_func, grp_unmarshal_func);
584 #endif
585
586 static const ns_dtab dtab[] = {
587 { NSSRC_FILES, files_group, (void *)nss_lt_name },
588 #ifdef HESIOD
589 { NSSRC_DNS, dns_group, (void *)nss_lt_name },
590 #endif
591 #ifdef YP
592 { NSSRC_NIS, nis_group, (void *)nss_lt_name },
593 #endif
594 { NSSRC_COMPAT, compat_group, (void *)nss_lt_name },
595 #ifdef NS_CACHING
596 NS_CACHE_CB(&cache_info)
597 #endif
598 { NULL, NULL, NULL }
599 };
600 int rv, ret_errno;
601
602 ret_errno = 0;
603 *result = NULL;
604 rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrnam_r", defaultsrc,
605 name, grp, buffer, bufsize, &ret_errno);
606 if (rv == NS_SUCCESS)
607 return (0);
608 else
609 return (ret_errno);
610 }
611
612
613 int
getgrgid_r(gid_t gid,struct group * grp,char * buffer,size_t bufsize,struct group ** result)614 getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize,
615 struct group **result)
616 {
617 #ifdef NS_CACHING
618 static const nss_cache_info cache_info =
619 NS_COMMON_CACHE_INFO_INITIALIZER(
620 group, (void *)nss_lt_id,
621 grp_id_func, grp_marshal_func, grp_unmarshal_func);
622 #endif
623
624 static const ns_dtab dtab[] = {
625 { NSSRC_FILES, files_group, (void *)nss_lt_id },
626 #ifdef HESIOD
627 { NSSRC_DNS, dns_group, (void *)nss_lt_id },
628 #endif
629 #ifdef YP
630 { NSSRC_NIS, nis_group, (void *)nss_lt_id },
631 #endif
632 { NSSRC_COMPAT, compat_group, (void *)nss_lt_id },
633 #ifdef NS_CACHING
634 NS_CACHE_CB(&cache_info)
635 #endif
636 { NULL, NULL, NULL }
637 };
638 int rv, ret_errno;
639
640 ret_errno = 0;
641 *result = NULL;
642 rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrgid_r", defaultsrc,
643 gid, grp, buffer, bufsize, &ret_errno);
644 if (rv == NS_SUCCESS)
645 return (0);
646 else
647 return (ret_errno);
648 }
649
650
651
652 int
__getgroupmembership(const char * uname,gid_t agroup,gid_t * groups,int maxgrp,int * grpcnt)653 __getgroupmembership(const char *uname, gid_t agroup, gid_t *groups,
654 int maxgrp, int *grpcnt)
655 {
656 static const ns_dtab dtab[] = {
657 NS_FALLBACK_CB(getgroupmembership_fallback)
658 { NULL, NULL, NULL }
659 };
660 int rv __unused;
661
662 assert(uname != NULL);
663 /* groups may be NULL if just sizing when invoked with maxgrp = 0 */
664 assert(grpcnt != NULL);
665
666 *grpcnt = 0;
667 rv = _nsdispatch(NULL, dtab, NSDB_GROUP, "getgroupmembership",
668 defaultsrc, uname, agroup, groups, maxgrp, grpcnt);
669
670 /* too many groups found? */
671 return (*grpcnt > maxgrp ? -1 : 0);
672 }
673
674
675 static struct group grp;
676 static char *grp_storage;
677 static size_t grp_storage_size;
678
679 static struct group *
getgr(int (* fn)(union key,struct group *,char *,size_t,struct group **),union key key)680 getgr(int (*fn)(union key, struct group *, char *, size_t, struct group **),
681 union key key)
682 {
683 int rv;
684 struct group *res;
685
686 if (grp_storage == NULL) {
687 grp_storage = malloc(GRP_STORAGE_INITIAL);
688 if (grp_storage == NULL)
689 return (NULL);
690 grp_storage_size = GRP_STORAGE_INITIAL;
691 }
692 do {
693 rv = fn(key, &grp, grp_storage, grp_storage_size, &res);
694 if (res == NULL && rv == ERANGE) {
695 free(grp_storage);
696 if ((grp_storage_size << 1) > GRP_STORAGE_MAX) {
697 grp_storage = NULL;
698 errno = ERANGE;
699 return (NULL);
700 }
701 grp_storage_size <<= 1;
702 grp_storage = malloc(grp_storage_size);
703 if (grp_storage == NULL)
704 return (NULL);
705 }
706 } while (res == NULL && rv == ERANGE);
707 if (rv != 0)
708 errno = rv;
709 return (res);
710 }
711
712
713 static int
wrap_getgrnam_r(union key key,struct group * grp,char * buffer,size_t bufsize,struct group ** res)714 wrap_getgrnam_r(union key key, struct group *grp, char *buffer, size_t bufsize,
715 struct group **res)
716 {
717 return (getgrnam_r(key.name, grp, buffer, bufsize, res));
718 }
719
720
721 static int
wrap_getgrgid_r(union key key,struct group * grp,char * buffer,size_t bufsize,struct group ** res)722 wrap_getgrgid_r(union key key, struct group *grp, char *buffer, size_t bufsize,
723 struct group **res)
724 {
725 return (getgrgid_r(key.gid, grp, buffer, bufsize, res));
726 }
727
728
729 static int
wrap_getgrent_r(union key key __unused,struct group * grp,char * buffer,size_t bufsize,struct group ** res)730 wrap_getgrent_r(union key key __unused, struct group *grp, char *buffer,
731 size_t bufsize, struct group **res)
732 {
733 return (getgrent_r(grp, buffer, bufsize, res));
734 }
735
736
737 struct group *
getgrnam(const char * name)738 getgrnam(const char *name)
739 {
740 union key key;
741
742 key.name = name;
743 return (getgr(wrap_getgrnam_r, key));
744 }
745
746
747 struct group *
getgrgid(gid_t gid)748 getgrgid(gid_t gid)
749 {
750 union key key;
751
752 key.gid = gid;
753 return (getgr(wrap_getgrgid_r, key));
754 }
755
756
757 struct group *
getgrent(void)758 getgrent(void)
759 {
760 union key key;
761
762 key.gid = 0; /* not used */
763 return (getgr(wrap_getgrent_r, key));
764 }
765
766
767 static int
is_comment_line(const char * s,size_t n)768 is_comment_line(const char *s, size_t n)
769 {
770 const char *eom;
771
772 eom = &s[n];
773
774 for (; s < eom; s++)
775 if (*s == '#' || !isspace((unsigned char)*s))
776 break;
777 return (*s == '#' || s == eom);
778 }
779
780
781 /*
782 * files backend
783 */
784 static void
files_endstate(void * p)785 files_endstate(void *p)
786 {
787
788 if (p == NULL)
789 return;
790 if (((struct files_state *)p)->fp != NULL)
791 fclose(((struct files_state *)p)->fp);
792 free(p);
793 }
794
795
796 static int
files_setgrent(void * retval __unused,void * mdata,va_list ap)797 files_setgrent(void *retval __unused, void *mdata, va_list ap)
798 {
799 struct files_state *st;
800 int rv, stayopen;
801
802 rv = files_getstate(&st);
803 if (rv != 0)
804 return (NS_UNAVAIL);
805 switch ((enum constants)mdata) {
806 case SETGRENT:
807 stayopen = va_arg(ap, int);
808 if (st->fp != NULL)
809 rewind(st->fp);
810 else if (stayopen)
811 st->fp = fopen(_PATH_GROUP, "r");
812 break;
813 case ENDGRENT:
814 if (st->fp != NULL) {
815 fclose(st->fp);
816 st->fp = NULL;
817 }
818 break;
819 default:
820 break;
821 }
822 return (NS_UNAVAIL);
823 }
824
825
826 static int
files_group(void * retval,void * mdata,va_list ap)827 files_group(void *retval, void *mdata, va_list ap)
828 {
829 struct files_state *st;
830 enum nss_lookup_type how;
831 const char *name, *line;
832 struct group *grp;
833 gid_t gid;
834 char *buffer;
835 size_t bufsize, linesize;
836 off_t pos;
837 int rv, stayopen, *errnop;
838
839 name = NULL;
840 gid = (gid_t)-1;
841 how = (enum nss_lookup_type)mdata;
842 switch (how) {
843 case nss_lt_name:
844 name = va_arg(ap, const char *);
845 break;
846 case nss_lt_id:
847 gid = va_arg(ap, gid_t);
848 break;
849 case nss_lt_all:
850 break;
851 default:
852 return (NS_NOTFOUND);
853 }
854 grp = va_arg(ap, struct group *);
855 buffer = va_arg(ap, char *);
856 bufsize = va_arg(ap, size_t);
857 errnop = va_arg(ap, int *);
858 *errnop = files_getstate(&st);
859 if (*errnop != 0)
860 return (NS_UNAVAIL);
861 if (st->fp == NULL &&
862 ((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) {
863 *errnop = errno;
864 return (NS_UNAVAIL);
865 }
866 if (how == nss_lt_all)
867 stayopen = 1;
868 else {
869 rewind(st->fp);
870 stayopen = st->stayopen;
871 }
872 rv = NS_NOTFOUND;
873 pos = ftello(st->fp);
874 while ((line = fgetln(st->fp, &linesize)) != NULL) {
875 if (line[linesize-1] == '\n')
876 linesize--;
877 rv = __gr_match_entry(line, linesize, how, name, gid);
878 if (rv != NS_SUCCESS)
879 continue;
880 /* We need room at least for the line, a string NUL
881 * terminator, alignment padding, and one (char *)
882 * pointer for the member list terminator.
883 */
884 if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
885 *errnop = ERANGE;
886 rv = NS_RETURN;
887 break;
888 }
889 memcpy(buffer, line, linesize);
890 buffer[linesize] = '\0';
891 rv = __gr_parse_entry(buffer, linesize, grp,
892 &buffer[linesize + 1], bufsize - linesize - 1, errnop);
893 if (rv & NS_TERMINATE)
894 break;
895 pos = ftello(st->fp);
896 }
897 if (!stayopen && st->fp != NULL) {
898 fclose(st->fp);
899 st->fp = NULL;
900 }
901 if (rv == NS_SUCCESS && retval != NULL)
902 *(struct group **)retval = grp;
903 else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL)
904 fseeko(st->fp, pos, SEEK_SET);
905 return (rv);
906 }
907
908
909 #ifdef HESIOD
910 /*
911 * dns backend
912 */
913 static void
dns_endstate(void * p)914 dns_endstate(void *p)
915 {
916
917 free(p);
918 }
919
920
921 static int
dns_setgrent(void * retval __unused,void * cb_data __unused,va_list ap __unused)922 dns_setgrent(void *retval __unused, void *cb_data __unused, va_list ap __unused)
923 {
924 struct dns_state *st;
925 int rv;
926
927 rv = dns_getstate(&st);
928 if (rv != 0)
929 return (NS_UNAVAIL);
930 st->counter = 0;
931 return (NS_UNAVAIL);
932 }
933
934
935 static int
dns_group(void * retval,void * mdata,va_list ap)936 dns_group(void *retval, void *mdata, va_list ap)
937 {
938 char buf[HESIOD_NAME_MAX];
939 struct dns_state *st;
940 struct group *grp;
941 const char *name, *label;
942 void *ctx;
943 char *buffer, **hes;
944 size_t bufsize, adjsize, linesize;
945 gid_t gid;
946 enum nss_lookup_type how;
947 int rv, *errnop;
948
949 ctx = NULL;
950 hes = NULL;
951 name = NULL;
952 gid = (gid_t)-1;
953 how = (enum nss_lookup_type)mdata;
954 switch (how) {
955 case nss_lt_name:
956 name = va_arg(ap, const char *);
957 break;
958 case nss_lt_id:
959 gid = va_arg(ap, gid_t);
960 break;
961 case nss_lt_all:
962 break;
963 }
964 grp = va_arg(ap, struct group *);
965 buffer = va_arg(ap, char *);
966 bufsize = va_arg(ap, size_t);
967 errnop = va_arg(ap, int *);
968 *errnop = dns_getstate(&st);
969 if (*errnop != 0)
970 return (NS_UNAVAIL);
971 if (hesiod_init(&ctx) != 0) {
972 *errnop = errno;
973 rv = NS_UNAVAIL;
974 goto fin;
975 }
976 do {
977 rv = NS_NOTFOUND;
978 switch (how) {
979 case nss_lt_name:
980 label = name;
981 break;
982 case nss_lt_id:
983 if (snprintf(buf, sizeof(buf), "%lu",
984 (unsigned long)gid) >= sizeof(buf))
985 goto fin;
986 label = buf;
987 break;
988 case nss_lt_all:
989 if (st->counter < 0)
990 goto fin;
991 if (snprintf(buf, sizeof(buf), "group-%ld",
992 st->counter++) >= sizeof(buf))
993 goto fin;
994 label = buf;
995 break;
996 }
997 hes = hesiod_resolve(ctx, label,
998 how == nss_lt_id ? "gid" : "group");
999 if ((how == nss_lt_id && hes == NULL &&
1000 (hes = hesiod_resolve(ctx, buf, "group")) == NULL) ||
1001 hes == NULL) {
1002 if (how == nss_lt_all)
1003 st->counter = -1;
1004 if (errno != ENOENT)
1005 *errnop = errno;
1006 goto fin;
1007 }
1008 rv = __gr_match_entry(hes[0], strlen(hes[0]), how, name, gid);
1009 if (rv != NS_SUCCESS) {
1010 hesiod_free_list(ctx, hes);
1011 hes = NULL;
1012 continue;
1013 }
1014 /* We need room at least for the line, a string NUL
1015 * terminator, alignment padding, and one (char *)
1016 * pointer for the member list terminator.
1017 */
1018 adjsize = bufsize - _ALIGNBYTES - sizeof(char *);
1019 linesize = strlcpy(buffer, hes[0], adjsize);
1020 if (linesize >= adjsize) {
1021 *errnop = ERANGE;
1022 rv = NS_RETURN;
1023 goto fin;
1024 }
1025 hesiod_free_list(ctx, hes);
1026 hes = NULL;
1027 rv = __gr_parse_entry(buffer, linesize, grp,
1028 &buffer[linesize + 1], bufsize - linesize - 1, errnop);
1029 } while (how == nss_lt_all && !(rv & NS_TERMINATE));
1030 fin:
1031 if (hes != NULL)
1032 hesiod_free_list(ctx, hes);
1033 if (ctx != NULL)
1034 hesiod_end(ctx);
1035 if (rv == NS_SUCCESS && retval != NULL)
1036 *(struct group **)retval = grp;
1037 return (rv);
1038 }
1039 #endif /* HESIOD */
1040
1041
1042 #ifdef YP
1043 /*
1044 * nis backend
1045 */
1046 static void
nis_endstate(void * p)1047 nis_endstate(void *p)
1048 {
1049
1050 if (p == NULL)
1051 return;
1052 free(((struct nis_state *)p)->key);
1053 free(p);
1054 }
1055
1056
1057 static int
nis_setgrent(void * retval __unused,void * cb_data __unused,va_list ap __unused)1058 nis_setgrent(void *retval __unused, void *cb_data __unused, va_list ap __unused)
1059 {
1060 struct nis_state *st;
1061 int rv;
1062
1063 rv = nis_getstate(&st);
1064 if (rv != 0)
1065 return (NS_UNAVAIL);
1066 st->done = 0;
1067 free(st->key);
1068 st->key = NULL;
1069 return (NS_UNAVAIL);
1070 }
1071
1072
1073 static int
nis_group(void * retval,void * mdata,va_list ap)1074 nis_group(void *retval, void *mdata, va_list ap)
1075 {
1076 char *map;
1077 struct nis_state *st;
1078 struct group *grp;
1079 const char *name;
1080 char *buffer, *key, *result;
1081 size_t bufsize;
1082 gid_t gid;
1083 enum nss_lookup_type how;
1084 int *errnop, keylen, resultlen, rv;
1085
1086 name = NULL;
1087 gid = (gid_t)-1;
1088 how = (enum nss_lookup_type)mdata;
1089 switch (how) {
1090 case nss_lt_name:
1091 name = va_arg(ap, const char *);
1092 map = "group.byname";
1093 break;
1094 case nss_lt_id:
1095 gid = va_arg(ap, gid_t);
1096 map = "group.bygid";
1097 break;
1098 case nss_lt_all:
1099 map = "group.byname";
1100 break;
1101 }
1102 grp = va_arg(ap, struct group *);
1103 buffer = va_arg(ap, char *);
1104 bufsize = va_arg(ap, size_t);
1105 errnop = va_arg(ap, int *);
1106 *errnop = nis_getstate(&st);
1107 if (*errnop != 0)
1108 return (NS_UNAVAIL);
1109 if (st->domain[0] == '\0') {
1110 if (getdomainname(st->domain, sizeof(st->domain)) != 0) {
1111 *errnop = errno;
1112 return (NS_UNAVAIL);
1113 }
1114 }
1115 result = NULL;
1116 do {
1117 rv = NS_NOTFOUND;
1118 switch (how) {
1119 case nss_lt_name:
1120 if (strlcpy(buffer, name, bufsize) >= bufsize)
1121 goto erange;
1122 break;
1123 case nss_lt_id:
1124 if (snprintf(buffer, bufsize, "%lu",
1125 (unsigned long)gid) >= bufsize)
1126 goto erange;
1127 break;
1128 case nss_lt_all:
1129 if (st->done)
1130 goto fin;
1131 break;
1132 }
1133 result = NULL;
1134 if (how == nss_lt_all) {
1135 if (st->key == NULL)
1136 rv = yp_first(st->domain, map, &st->key,
1137 &st->keylen, &result, &resultlen);
1138 else {
1139 key = st->key;
1140 keylen = st->keylen;
1141 st->key = NULL;
1142 rv = yp_next(st->domain, map, key, keylen,
1143 &st->key, &st->keylen, &result,
1144 &resultlen);
1145 free(key);
1146 }
1147 if (rv != 0) {
1148 free(result);
1149 free(st->key);
1150 st->key = NULL;
1151 if (rv == YPERR_NOMORE) {
1152 st->done = 1;
1153 rv = NS_NOTFOUND;
1154 } else
1155 rv = NS_UNAVAIL;
1156 goto fin;
1157 }
1158 } else {
1159 rv = yp_match(st->domain, map, buffer, strlen(buffer),
1160 &result, &resultlen);
1161 if (rv == YPERR_KEY) {
1162 rv = NS_NOTFOUND;
1163 continue;
1164 } else if (rv != 0) {
1165 free(result);
1166 rv = NS_UNAVAIL;
1167 continue;
1168 }
1169 }
1170 /* We need room at least for the line, a string NUL
1171 * terminator, alignment padding, and one (char *)
1172 * pointer for the member list terminator.
1173 */
1174 if (resultlen >= bufsize - _ALIGNBYTES - sizeof(char *))
1175 goto erange;
1176 memcpy(buffer, result, resultlen);
1177 buffer[resultlen] = '\0';
1178 free(result);
1179 rv = __gr_match_entry(buffer, resultlen, how, name, gid);
1180 if (rv == NS_SUCCESS)
1181 rv = __gr_parse_entry(buffer, resultlen, grp,
1182 &buffer[resultlen+1], bufsize - resultlen - 1,
1183 errnop);
1184 } while (how == nss_lt_all && !(rv & NS_TERMINATE));
1185 fin:
1186 if (rv == NS_SUCCESS && retval != NULL)
1187 *(struct group **)retval = grp;
1188 return (rv);
1189 erange:
1190 *errnop = ERANGE;
1191 return (NS_RETURN);
1192 }
1193 #endif /* YP */
1194
1195
1196
1197 /*
1198 * compat backend
1199 */
1200 static void
compat_endstate(void * p)1201 compat_endstate(void *p)
1202 {
1203 struct compat_state *st;
1204
1205 if (p == NULL)
1206 return;
1207 st = (struct compat_state *)p;
1208 free(st->name);
1209 if (st->fp != NULL)
1210 fclose(st->fp);
1211 free(p);
1212 }
1213
1214
1215 static int
compat_setgrent(void * retval __unused,void * mdata,va_list ap)1216 compat_setgrent(void *retval __unused, void *mdata, va_list ap)
1217 {
1218 static const ns_src compatsrc[] = {
1219 #ifdef YP
1220 { NSSRC_NIS, NS_SUCCESS },
1221 #endif
1222 { NULL, 0 }
1223 };
1224 ns_dtab dtab[] = {
1225 #ifdef HESIOD
1226 { NSSRC_DNS, dns_setgrent, NULL },
1227 #endif
1228 #ifdef YP
1229 { NSSRC_NIS, nis_setgrent, NULL },
1230 #endif
1231 { NULL, NULL, NULL }
1232 };
1233 struct compat_state *st;
1234 int rv, stayopen;
1235
1236 #define set_setent(x, y) do { \
1237 int i; \
1238 \
1239 for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \
1240 x[i].mdata = (void *)y; \
1241 } while (0)
1242
1243 rv = compat_getstate(&st);
1244 if (rv != 0)
1245 return (NS_UNAVAIL);
1246 switch ((enum constants)mdata) {
1247 case SETGRENT:
1248 stayopen = va_arg(ap, int);
1249 if (st->fp != NULL)
1250 rewind(st->fp);
1251 else if (stayopen)
1252 st->fp = fopen(_PATH_GROUP, "r");
1253 set_setent(dtab, mdata);
1254 _nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "setgrent",
1255 compatsrc, 0);
1256 break;
1257 case ENDGRENT:
1258 if (st->fp != NULL) {
1259 fclose(st->fp);
1260 st->fp = NULL;
1261 }
1262 set_setent(dtab, mdata);
1263 _nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "endgrent",
1264 compatsrc, 0);
1265 break;
1266 default:
1267 break;
1268 }
1269 st->compat = COMPAT_MODE_OFF;
1270 free(st->name);
1271 st->name = NULL;
1272 return (NS_UNAVAIL);
1273 #undef set_setent
1274 }
1275
1276
1277 static int
compat_group(void * retval,void * mdata,va_list ap)1278 compat_group(void *retval, void *mdata, va_list ap)
1279 {
1280 static const ns_src compatsrc[] = {
1281 #ifdef YP
1282 { NSSRC_NIS, NS_SUCCESS },
1283 #endif
1284 { NULL, 0 }
1285 };
1286 ns_dtab dtab[] = {
1287 #ifdef YP
1288 { NSSRC_NIS, nis_group, NULL },
1289 #endif
1290 #ifdef HESIOD
1291 { NSSRC_DNS, dns_group, NULL },
1292 #endif
1293 { NULL, NULL, NULL }
1294 };
1295 struct compat_state *st;
1296 enum nss_lookup_type how;
1297 const char *name, *line;
1298 struct group *grp;
1299 gid_t gid;
1300 char *buffer, *p;
1301 void *discard;
1302 size_t bufsize, linesize;
1303 off_t pos;
1304 int rv, stayopen, *errnop;
1305
1306 #define set_lookup_type(x, y) do { \
1307 int i; \
1308 \
1309 for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \
1310 x[i].mdata = (void *)y; \
1311 } while (0)
1312
1313 name = NULL;
1314 gid = (gid_t)-1;
1315 how = (enum nss_lookup_type)mdata;
1316 switch (how) {
1317 case nss_lt_name:
1318 name = va_arg(ap, const char *);
1319 break;
1320 case nss_lt_id:
1321 gid = va_arg(ap, gid_t);
1322 break;
1323 case nss_lt_all:
1324 break;
1325 default:
1326 return (NS_NOTFOUND);
1327 }
1328 grp = va_arg(ap, struct group *);
1329 buffer = va_arg(ap, char *);
1330 bufsize = va_arg(ap, size_t);
1331 errnop = va_arg(ap, int *);
1332 *errnop = compat_getstate(&st);
1333 if (*errnop != 0)
1334 return (NS_UNAVAIL);
1335 if (st->fp == NULL &&
1336 ((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) {
1337 *errnop = errno;
1338 rv = NS_UNAVAIL;
1339 goto fin;
1340 }
1341 if (how == nss_lt_all)
1342 stayopen = 1;
1343 else {
1344 rewind(st->fp);
1345 stayopen = st->stayopen;
1346 }
1347 docompat:
1348 switch (st->compat) {
1349 case COMPAT_MODE_ALL:
1350 set_lookup_type(dtab, how);
1351 switch (how) {
1352 case nss_lt_all:
1353 rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1354 "getgrent_r", compatsrc, grp, buffer, bufsize,
1355 errnop);
1356 break;
1357 case nss_lt_id:
1358 rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1359 "getgrgid_r", compatsrc, gid, grp, buffer, bufsize,
1360 errnop);
1361 break;
1362 case nss_lt_name:
1363 rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1364 "getgrnam_r", compatsrc, name, grp, buffer,
1365 bufsize, errnop);
1366 break;
1367 }
1368 if (rv & NS_TERMINATE)
1369 goto fin;
1370 st->compat = COMPAT_MODE_OFF;
1371 break;
1372 case COMPAT_MODE_NAME:
1373 set_lookup_type(dtab, nss_lt_name);
1374 rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
1375 "getgrnam_r", compatsrc, st->name, grp, buffer, bufsize,
1376 errnop);
1377 switch (rv) {
1378 case NS_SUCCESS:
1379 switch (how) {
1380 case nss_lt_name:
1381 if (strcmp(name, grp->gr_name) != 0)
1382 rv = NS_NOTFOUND;
1383 break;
1384 case nss_lt_id:
1385 if (gid != grp->gr_gid)
1386 rv = NS_NOTFOUND;
1387 break;
1388 default:
1389 break;
1390 }
1391 break;
1392 case NS_RETURN:
1393 goto fin;
1394 default:
1395 break;
1396 }
1397 free(st->name);
1398 st->name = NULL;
1399 st->compat = COMPAT_MODE_OFF;
1400 if (rv == NS_SUCCESS)
1401 goto fin;
1402 break;
1403 default:
1404 break;
1405 }
1406 rv = NS_NOTFOUND;
1407 pos = ftello(st->fp);
1408 while ((line = fgetln(st->fp, &linesize)) != NULL) {
1409 if (line[linesize-1] == '\n')
1410 linesize--;
1411 if (linesize > 2 && line[0] == '+') {
1412 p = memchr(&line[1], ':', linesize);
1413 if (p == NULL || p == &line[1])
1414 st->compat = COMPAT_MODE_ALL;
1415 else {
1416 st->name = malloc(p - line);
1417 if (st->name == NULL) {
1418 syslog(LOG_ERR,
1419 "getgrent memory allocation failure");
1420 *errnop = ENOMEM;
1421 rv = NS_UNAVAIL;
1422 break;
1423 }
1424 memcpy(st->name, &line[1], p - line - 1);
1425 st->name[p - line - 1] = '\0';
1426 st->compat = COMPAT_MODE_NAME;
1427 }
1428 goto docompat;
1429 }
1430 rv = __gr_match_entry(line, linesize, how, name, gid);
1431 if (rv != NS_SUCCESS)
1432 continue;
1433 /* We need room at least for the line, a string NUL
1434 * terminator, alignment padding, and one (char *)
1435 * pointer for the member list terminator.
1436 */
1437 if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
1438 *errnop = ERANGE;
1439 rv = NS_RETURN;
1440 break;
1441 }
1442 memcpy(buffer, line, linesize);
1443 buffer[linesize] = '\0';
1444 rv = __gr_parse_entry(buffer, linesize, grp,
1445 &buffer[linesize + 1], bufsize - linesize - 1, errnop);
1446 if (rv & NS_TERMINATE)
1447 break;
1448 pos = ftello(st->fp);
1449 }
1450 fin:
1451 if (!stayopen && st->fp != NULL) {
1452 fclose(st->fp);
1453 st->fp = NULL;
1454 }
1455 if (rv == NS_SUCCESS && retval != NULL)
1456 *(struct group **)retval = grp;
1457 else if (rv == NS_RETURN && *errnop == ERANGE && st->fp != NULL)
1458 fseeko(st->fp, pos, SEEK_SET);
1459 return (rv);
1460 #undef set_lookup_type
1461 }
1462
1463
1464 /*
1465 * common group line matching and parsing
1466 */
1467 int
__gr_match_entry(const char * line,size_t linesize,enum nss_lookup_type how,const char * name,gid_t gid)1468 __gr_match_entry(const char *line, size_t linesize, enum nss_lookup_type how,
1469 const char *name, gid_t gid)
1470 {
1471 size_t namesize;
1472 const char *p, *eol;
1473 char *q;
1474 unsigned long n;
1475 int i, needed;
1476
1477 if (linesize == 0 || is_comment_line(line, linesize))
1478 return (NS_NOTFOUND);
1479 switch (how) {
1480 case nss_lt_name: needed = 1; break;
1481 case nss_lt_id: needed = 2; break;
1482 default: needed = 2; break;
1483 }
1484 eol = &line[linesize];
1485 for (p = line, i = 0; i < needed && p < eol; p++)
1486 if (*p == ':')
1487 i++;
1488 if (i < needed)
1489 return (NS_NOTFOUND);
1490 switch (how) {
1491 case nss_lt_name:
1492 namesize = strlen(name);
1493 if (namesize + 1 == (size_t)(p - line) &&
1494 memcmp(line, name, namesize) == 0)
1495 return (NS_SUCCESS);
1496 break;
1497 case nss_lt_id:
1498 n = strtoul(p, &q, 10);
1499 if (q < eol && *q == ':' && gid == (gid_t)n)
1500 return (NS_SUCCESS);
1501 break;
1502 case nss_lt_all:
1503 return (NS_SUCCESS);
1504 default:
1505 break;
1506 }
1507 return (NS_NOTFOUND);
1508 }
1509
1510
1511 int
__gr_parse_entry(char * line,size_t linesize __unused,struct group * grp,char * membuf,size_t membufsize,int * errnop)1512 __gr_parse_entry(char *line, size_t linesize __unused, struct group *grp,
1513 char *membuf, size_t membufsize, int *errnop)
1514 {
1515 char *s_gid, *s_mem, *p, **members;
1516 unsigned long n;
1517 int maxmembers;
1518
1519 memset(grp, 0, sizeof(*grp));
1520 members = (char **)_ALIGN(membuf);
1521 membufsize -= (char *)members - membuf;
1522 maxmembers = membufsize / sizeof(*members);
1523 if (maxmembers <= 0 ||
1524 (grp->gr_name = strsep(&line, ":")) == NULL ||
1525 grp->gr_name[0] == '\0' ||
1526 (grp->gr_passwd = strsep(&line, ":")) == NULL ||
1527 (s_gid = strsep(&line, ":")) == NULL ||
1528 s_gid[0] == '\0')
1529 return (NS_NOTFOUND);
1530 s_mem = line;
1531 n = strtoul(s_gid, &s_gid, 10);
1532 if (s_gid[0] != '\0')
1533 return (NS_NOTFOUND);
1534 grp->gr_gid = (gid_t)n;
1535 grp->gr_mem = members;
1536 while (maxmembers > 1 && s_mem != NULL) {
1537 p = strsep(&s_mem, ",");
1538 if (p != NULL && *p != '\0') {
1539 *members++ = p;
1540 maxmembers--;
1541 }
1542 }
1543 *members = NULL;
1544 if (s_mem == NULL)
1545 return (NS_SUCCESS);
1546 else {
1547 *errnop = ERANGE;
1548 return (NS_RETURN);
1549 }
1550 }
1551