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source: vendor/FreeBSD-libc/5.3/gen/getgrent.c@ 2404

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Last change on this file since 2404 was 1695, checked in by bird, 21 years ago
FreeBSD 5.3 libc sources.
Property cvs2svn:cvs-rev set to `1.1.1.2` Property svn:eol-style set to `native` Property svn:executable set to ``*
File size: 24.8 KB

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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	*/
33	#include <sys/cdefs.h>
34	__FBSDID("$FreeBSD: src/lib/libc/gen/getgrent.c,v 1.32 2004/05/17 22:15:49 kientzle Exp $");
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 <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
61
62	enum constants {
63	GRP_STORAGE_INITIAL = 1 << 10, /* 1 KByte */
64	GRP_STORAGE_MAX = 1 << 20, /* 1 MByte */
65	SETGRENT = 1,
66	ENDGRENT = 2,
67	HESIOD_NAME_MAX = 256,
68	};
69
70	static const ns_src defaultsrc[] = {
71	{ NSSRC_COMPAT, NS_SUCCESS },
72	{ NULL, 0 }
73	};
74
75	int __gr_match_entry(const char *, size_t, enum nss_lookup_type,
76	const char *, gid_t);
77	int __gr_parse_entry(char , size_t, struct group , char *, size_t,
78	int *);
79
80	static int is_comment_line(const char *, size_t);
81
82	union key {
83	const char *name;
84	gid_t gid;
85	};
86	static struct group getgr(int ()(union key, struct group , char , size_t,
87	struct group **), union key);
88	static int wrap_getgrnam_r(union key, struct group , char , size_t,
89	struct group **);
90	static int wrap_getgrgid_r(union key, struct group , char , size_t,
91	struct group **);
92	static int wrap_getgrent_r(union key, struct group , char , size_t,
93	struct group **);
94
95	struct files_state {
96	FILE *fp;
97	int stayopen;
98	};
99	static void files_endstate(void *);
100	NSS_TLS_HANDLING(files);
101	static int files_setgrent(void , void , va_list);
102	static int files_group(void , void , va_list);
103
104
105	#ifdef HESIOD
106	struct dns_state {
107	long counter;
108	};
109	static void dns_endstate(void *);
110	NSS_TLS_HANDLING(dns);
111	static int dns_setgrent(void , void , va_list);
112	static int dns_group(void , void , va_list);
113	#endif
114
115
116	#ifdef YP
117	struct nis_state {
118	char domain[MAXHOSTNAMELEN];
119	int done;
120	char *key;
121	int keylen;
122	};
123	static void nis_endstate(void *);
124	NSS_TLS_HANDLING(nis);
125	static int nis_setgrent(void , void , va_list);
126	static int nis_group(void , void , va_list);
127	#endif
128
129	struct compat_state {
130	FILE *fp;
131	int stayopen;
132	char *name;
133	enum _compat {
134	COMPAT_MODE_OFF = 0,
135	COMPAT_MODE_ALL,
136	COMPAT_MODE_NAME
137	} compat;
138	};
139	static void compat_endstate(void *);
140	NSS_TLS_HANDLING(compat);
141	static int compat_setgrent(void , void , va_list);
142	static int compat_group(void , void , va_list);
143
144
145	/* XXX IEEE Std 1003.1, 2003 specifies `void setgrent(void)' */
146	int
147	setgrent(void)
148	{
149	static const ns_dtab dtab[] = {
150	{ NSSRC_FILES, files_setgrent, (void *)SETGRENT },
151	#ifdef HESIOD
152	{ NSSRC_DNS, dns_setgrent, (void *)SETGRENT },
153	#endif
154	#ifdef YP
155	{ NSSRC_NIS, nis_setgrent, (void *)SETGRENT },
156	#endif
157	{ NSSRC_COMPAT, compat_setgrent, (void *)SETGRENT },
158	{ NULL, NULL, NULL }
159	};
160	(void)_nsdispatch(NULL, dtab, NSDB_GROUP, "setgrent", defaultsrc, 0);
161	return (1);
162	}
163
164
165	int
166	setgroupent(int stayopen)
167	{
168	static const ns_dtab dtab[] = {
169	{ NSSRC_FILES, files_setgrent, (void *)SETGRENT },
170	#ifdef HESIOD
171	{ NSSRC_DNS, dns_setgrent, (void *)SETGRENT },
172	#endif
173	#ifdef YP
174	{ NSSRC_NIS, nis_setgrent, (void *)SETGRENT },
175	#endif
176	{ NSSRC_COMPAT, compat_setgrent, (void *)SETGRENT },
177	{ NULL, NULL, NULL }
178	};
179	(void)_nsdispatch(NULL, dtab, NSDB_GROUP, "setgrent", defaultsrc,
180	stayopen);
181	return (1);
182	}
183
184
185	void
186	endgrent(void)
187	{
188	static const ns_dtab dtab[] = {
189	{ NSSRC_FILES, files_setgrent, (void *)ENDGRENT },
190	#ifdef HESIOD
191	{ NSSRC_DNS, dns_setgrent, (void *)ENDGRENT },
192	#endif
193	#ifdef YP
194	{ NSSRC_NIS, nis_setgrent, (void *)ENDGRENT },
195	#endif
196	{ NSSRC_COMPAT, compat_setgrent, (void *)ENDGRENT },
197	{ NULL, NULL, NULL }
198	};
199	(void)_nsdispatch(NULL, dtab, NSDB_GROUP, "endgrent", defaultsrc);
200	}
201
202
203	int
204	getgrent_r(struct group grp, char buffer, size_t bufsize,
205	struct group **result)
206	{
207	static const ns_dtab dtab[] = {
208	{ NSSRC_FILES, files_group, (void *)nss_lt_all },
209	#ifdef HESIOD
210	{ NSSRC_DNS, dns_group, (void *)nss_lt_all },
211	#endif
212	#ifdef YP
213	{ NSSRC_NIS, nis_group, (void *)nss_lt_all },
214	#endif
215	{ NSSRC_COMPAT, compat_group, (void *)nss_lt_all },
216	{ NULL, NULL, NULL }
217	};
218	int rv, ret_errno;
219
220	ret_errno = 0;
221	*result = NULL;
222	rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrent_r", defaultsrc,
223	grp, buffer, bufsize, &ret_errno);
224	if (rv == NS_SUCCESS)
225	return (0);
226	else
227	return (ret_errno);
228	}
229
230
231	int
232	getgrnam_r(const char name, struct group grp, char *buffer, size_t bufsize,
233	struct group **result)
234	{
235	static const ns_dtab dtab[] = {
236	{ NSSRC_FILES, files_group, (void *)nss_lt_name },
237	#ifdef HESIOD
238	{ NSSRC_DNS, dns_group, (void *)nss_lt_name },
239	#endif
240	#ifdef YP
241	{ NSSRC_NIS, nis_group, (void *)nss_lt_name },
242	#endif
243	{ NSSRC_COMPAT, compat_group, (void *)nss_lt_name },
244	{ NULL, NULL, NULL }
245	};
246	int rv, ret_errno;
247
248	ret_errno = 0;
249	*result = NULL;
250	rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrnam_r", defaultsrc,
251	name, grp, buffer, bufsize, &ret_errno);
252	if (rv == NS_SUCCESS)
253	return (0);
254	else
255	return (ret_errno);
256	}
257
258
259	int
260	getgrgid_r(gid_t gid, struct group grp, char buffer, size_t bufsize,
261	struct group **result)
262	{
263	static const ns_dtab dtab[] = {
264	{ NSSRC_FILES, files_group, (void *)nss_lt_id },
265	#ifdef HESIOD
266	{ NSSRC_DNS, dns_group, (void *)nss_lt_id },
267	#endif
268	#ifdef YP
269	{ NSSRC_NIS, nis_group, (void *)nss_lt_id },
270	#endif
271	{ NSSRC_COMPAT, compat_group, (void *)nss_lt_id },
272	{ NULL, NULL, NULL }
273	};
274	int rv, ret_errno;
275
276	ret_errno = 0;
277	*result = NULL;
278	rv = _nsdispatch(result, dtab, NSDB_GROUP, "getgrgid_r", defaultsrc,
279	gid, grp, buffer, bufsize, &ret_errno);
280	if (rv == NS_SUCCESS)
281	return (0);
282	else
283	return (ret_errno);
284	}
285
286
287	static struct group grp;
288	static char *grp_storage;
289	static size_t grp_storage_size;
290
291	static struct group *
292	getgr(int (fn)(union key, struct group , char , size_t, struct group *),
293	union key key)
294	{
295	int rv;
296	struct group *res;
297
298	if (grp_storage == NULL) {
299	grp_storage = malloc(GRP_STORAGE_INITIAL);
300	if (grp_storage == NULL)
301	return (NULL);
302	grp_storage_size = GRP_STORAGE_INITIAL;
303	}
304	do {
305	rv = fn(key, &grp, grp_storage, grp_storage_size, &res);
306	if (res == NULL && rv == ERANGE) {
307	free(grp_storage);
308	if ((grp_storage_size << 1) > GRP_STORAGE_MAX) {
309	grp_storage = NULL;
310	errno = ERANGE;
311	return (NULL);
312	}
313	grp_storage_size <<= 1;
314	grp_storage = malloc(grp_storage_size);
315	if (grp_storage == NULL)
316	return (NULL);
317	}
318	} while (res == NULL && rv == ERANGE);
319	if (rv != 0)
320	errno = rv;
321	return (res);
322	}
323
324
325	static int
326	wrap_getgrnam_r(union key key, struct group grp, char buffer, size_t bufsize,
327	struct group **res)
328	{
329	return (getgrnam_r(key.name, grp, buffer, bufsize, res));
330	}
331
332
333	static int
334	wrap_getgrgid_r(union key key, struct group grp, char buffer, size_t bufsize,
335	struct group **res)
336	{
337	return (getgrgid_r(key.gid, grp, buffer, bufsize, res));
338	}
339
340
341	static int
342	wrap_getgrent_r(union key key __unused, struct group grp, char buffer,
343	size_t bufsize, struct group **res)
344	{
345	return (getgrent_r(grp, buffer, bufsize, res));
346	}
347
348
349	struct group *
350	getgrnam(const char *name)
351	{
352	union key key;
353
354	key.name = name;
355	return (getgr(wrap_getgrnam_r, key));
356	}
357
358
359	struct group *
360	getgrgid(gid_t gid)
361	{
362	union key key;
363
364	key.gid = gid;
365	return (getgr(wrap_getgrgid_r, key));
366	}
367
368
369	struct group *
370	getgrent(void)
371	{
372	union key key;
373
374	key.gid = 0; /* not used */
375	return (getgr(wrap_getgrent_r, key));
376	}
377
378
379	static int
380	is_comment_line(const char *s, size_t n)
381	{
382	const char *eom;
383
384	eom = &s[n];
385
386	for (; s < eom; s++)
387	if (s == '#' \|\| !isspace((unsigned char)s))
388	break;
389	return (*s == '#' \|\| s == eom);
390	}
391
392
393	/*
394	* files backend
395	*/
396	static void
397	files_endstate(void *p)
398	{
399
400	if (p == NULL)
401	return;
402	if (((struct files_state *)p)->fp != NULL)
403	fclose(((struct files_state *)p)->fp);
404	free(p);
405	}
406
407
408	static int
409	files_setgrent(void retval, void mdata, va_list ap)
410	{
411	struct files_state *st;
412	int rv, stayopen;
413
414	rv = files_getstate(&st);
415	if (rv != 0)
416	return (NS_UNAVAIL);
417	switch ((enum constants)mdata) {
418	case SETGRENT:
419	stayopen = va_arg(ap, int);
420	if (st->fp != NULL)
421	rewind(st->fp);
422	else if (stayopen)
423	st->fp = fopen(_PATH_GROUP, "r");
424	break;
425	case ENDGRENT:
426	if (st->fp != NULL) {
427	fclose(st->fp);
428	st->fp = NULL;
429	}
430	break;
431	default:
432	break;
433	}
434	return (NS_UNAVAIL);
435	}
436
437
438	static int
439	files_group(void retval, void mdata, va_list ap)
440	{
441	struct files_state *st;
442	enum nss_lookup_type how;
443	const char name, line;
444	struct group *grp;
445	gid_t gid;
446	char *buffer;
447	size_t bufsize, linesize;
448	int rv, stayopen, *errnop;
449
450	name = NULL;
451	gid = (gid_t)-1;
452	how = (enum nss_lookup_type)mdata;
453	switch (how) {
454	case nss_lt_name:
455	name = va_arg(ap, const char *);
456	break;
457	case nss_lt_id:
458	gid = va_arg(ap, gid_t);
459	break;
460	case nss_lt_all:
461	break;
462	default:
463	return (NS_NOTFOUND);
464	}
465	grp = va_arg(ap, struct group *);
466	buffer = va_arg(ap, char *);
467	bufsize = va_arg(ap, size_t);
468	errnop = va_arg(ap, int *);
469	*errnop = files_getstate(&st);
470	if (*errnop != 0)
471	return (NS_UNAVAIL);
472	if (st->fp == NULL &&
473	((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) {
474	*errnop = errno;
475	return (NS_UNAVAIL);
476	}
477	if (how == nss_lt_all)
478	stayopen = 1;
479	else {
480	rewind(st->fp);
481	stayopen = st->stayopen;
482	}
483	rv = NS_NOTFOUND;
484	while ((line = fgetln(st->fp, &linesize)) != NULL) {
485	if (line[linesize-1] == '\n')
486	linesize--;
487	rv = __gr_match_entry(line, linesize, how, name, gid);
488	if (rv != NS_SUCCESS)
489	continue;
490	/* We need room at least for the line, a string NUL
491	* terminator, alignment padding, and one (char *)
492	* pointer for the member list terminator.
493	*/
494	if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
495	*errnop = ERANGE;
496	rv = NS_RETURN;
497	break;
498	}
499	memcpy(buffer, line, linesize);
500	buffer[linesize] = '\0';
501	rv = __gr_parse_entry(buffer, linesize, grp,
502	&buffer[linesize + 1], bufsize - linesize - 1, errnop);
503	if (rv & NS_TERMINATE)
504	break;
505	}
506	if (!stayopen && st->fp != NULL) {
507	fclose(st->fp);
508	st->fp = NULL;
509	}
510	if (rv == NS_SUCCESS && retval != NULL)
511	(struct group *)retval = grp;
512	return (rv);
513	}
514
515
516	#ifdef HESIOD
517	/*
518	* dns backend
519	*/
520	static void
521	dns_endstate(void *p)
522	{
523
524	free(p);
525	}
526
527
528	static int
529	dns_setgrent(void retval, void cb_data, va_list ap)
530	{
531	struct dns_state *st;
532	int rv;
533
534	rv = dns_getstate(&st);
535	if (rv != 0)
536	return (NS_UNAVAIL);
537	st->counter = 0;
538	return (NS_UNAVAIL);
539	}
540
541
542	static int
543	dns_group(void retval, void mdata, va_list ap)
544	{
545	char buf[HESIOD_NAME_MAX];
546	struct dns_state *st;
547	struct group *grp;
548	const char name, label;
549	void *ctx;
550	char buffer, *hes;
551	size_t bufsize, adjsize, linesize;
552	gid_t gid;
553	enum nss_lookup_type how;
554	int rv, *errnop;
555
556	ctx = NULL;
557	hes = NULL;
558	name = NULL;
559	gid = (gid_t)-1;
560	how = (enum nss_lookup_type)mdata;
561	switch (how) {
562	case nss_lt_name:
563	name = va_arg(ap, const char *);
564	break;
565	case nss_lt_id:
566	gid = va_arg(ap, gid_t);
567	break;
568	case nss_lt_all:
569	break;
570	}
571	grp = va_arg(ap, struct group *);
572	buffer = va_arg(ap, char *);
573	bufsize = va_arg(ap, size_t);
574	errnop = va_arg(ap, int *);
575	*errnop = dns_getstate(&st);
576	if (*errnop != 0)
577	return (NS_UNAVAIL);
578	if (hesiod_init(&ctx) != 0) {
579	*errnop = errno;
580	rv = NS_UNAVAIL;
581	goto fin;
582	}
583	do {
584	rv = NS_NOTFOUND;
585	switch (how) {
586	case nss_lt_name:
587	label = name;
588	break;
589	case nss_lt_id:
590	if (snprintf(buf, sizeof(buf), "%lu",
591	(unsigned long)gid) >= sizeof(buf))
592	goto fin;
593	label = buf;
594	break;
595	case nss_lt_all:
596	if (st->counter < 0)
597	goto fin;
598	if (snprintf(buf, sizeof(buf), "group-%ld",
599	st->counter++) >= sizeof(buf))
600	goto fin;
601	label = buf;
602	break;
603	}
604	hes = hesiod_resolve(ctx, label,
605	how == nss_lt_id ? "gid" : "group");
606	if ((how == nss_lt_id && hes == NULL &&
607	(hes = hesiod_resolve(ctx, buf, "group")) == NULL) \|\|
608	hes == NULL) {
609	if (how == nss_lt_all)
610	st->counter = -1;
611	if (errno != ENOENT)
612	*errnop = errno;
613	goto fin;
614	}
615	rv = __gr_match_entry(hes[0], strlen(hes[0]), how, name, gid);
616	if (rv != NS_SUCCESS) {
617	hesiod_free_list(ctx, hes);
618	hes = NULL;
619	continue;
620	}
621	/* We need room at least for the line, a string NUL
622	* terminator, alignment padding, and one (char *)
623	* pointer for the member list terminator.
624	*/
625	adjsize = bufsize - _ALIGNBYTES - sizeof(char *);
626	linesize = strlcpy(buffer, hes[0], adjsize);
627	if (linesize >= adjsize) {
628	*errnop = ERANGE;
629	rv = NS_RETURN;
630	goto fin;
631	}
632	hesiod_free_list(ctx, hes);
633	hes = NULL;
634	rv = __gr_parse_entry(buffer, linesize, grp,
635	&buffer[linesize + 1], bufsize - linesize - 1, errnop);
636	} while (how == nss_lt_all && !(rv & NS_TERMINATE));
637	fin:
638	if (hes != NULL)
639	hesiod_free_list(ctx, hes);
640	if (ctx != NULL)
641	hesiod_end(ctx);
642	if (rv == NS_SUCCESS && retval != NULL)
643	(struct group *)retval = grp;
644	return (rv);
645	}
646	#endif /* HESIOD */
647
648
649	#ifdef YP
650	/*
651	* nis backend
652	*/
653	static void
654	nis_endstate(void *p)
655	{
656
657	if (p == NULL)
658	return;
659	free(((struct nis_state *)p)->key);
660	free(p);
661	}
662
663
664	static int
665	nis_setgrent(void retval, void cb_data, va_list ap)
666	{
667	struct nis_state *st;
668	int rv;
669
670	rv = nis_getstate(&st);
671	if (rv != 0)
672	return (NS_UNAVAIL);
673	st->done = 0;
674	free(st->key);
675	st->key = NULL;
676	return (NS_UNAVAIL);
677	}
678
679
680	static int
681	nis_group(void retval, void mdata, va_list ap)
682	{
683	char *map;
684	struct nis_state *st;
685	struct group *grp;
686	const char *name;
687	char buffer, key, *result;
688	size_t bufsize;
689	gid_t gid;
690	enum nss_lookup_type how;
691	int *errnop, keylen, resultlen, rv;
692
693	name = NULL;
694	gid = (gid_t)-1;
695	how = (enum nss_lookup_type)mdata;
696	switch (how) {
697	case nss_lt_name:
698	name = va_arg(ap, const char *);
699	map = "group.byname";
700	break;
701	case nss_lt_id:
702	gid = va_arg(ap, gid_t);
703	map = "group.bygid";
704	break;
705	case nss_lt_all:
706	map = "group.byname";
707	break;
708	}
709	grp = va_arg(ap, struct group *);
710	buffer = va_arg(ap, char *);
711	bufsize = va_arg(ap, size_t);
712	errnop = va_arg(ap, int *);
713	*errnop = nis_getstate(&st);
714	if (*errnop != 0)
715	return (NS_UNAVAIL);
716	if (st->domain[0] == '\0') {
717	if (getdomainname(st->domain, sizeof(st->domain)) != 0) {
718	*errnop = errno;
719	return (NS_UNAVAIL);
720	}
721	}
722	result = NULL;
723	do {
724	rv = NS_NOTFOUND;
725	switch (how) {
726	case nss_lt_name:
727	if (strlcpy(buffer, name, bufsize) >= bufsize)
728	goto erange;
729	break;
730	case nss_lt_id:
731	if (snprintf(buffer, bufsize, "%lu",
732	(unsigned long)gid) >= bufsize)
733	goto erange;
734	break;
735	case nss_lt_all:
736	if (st->done)
737	goto fin;
738	break;
739	}
740	result = NULL;
741	if (how == nss_lt_all) {
742	if (st->key == NULL)
743	rv = yp_first(st->domain, map, &st->key,
744	&st->keylen, &result, &resultlen);
745	else {
746	key = st->key;
747	keylen = st->keylen;
748	st->key = NULL;
749	rv = yp_next(st->domain, map, key, keylen,
750	&st->key, &st->keylen, &result,
751	&resultlen);
752	free(key);
753	}
754	if (rv != 0) {
755	free(result);
756	free(st->key);
757	st->key = NULL;
758	if (rv == YPERR_NOMORE) {
759	st->done = 1;
760	rv = NS_NOTFOUND;
761	} else
762	rv = NS_UNAVAIL;
763	goto fin;
764	}
765	} else {
766	rv = yp_match(st->domain, map, buffer, strlen(buffer),
767	&result, &resultlen);
768	if (rv == YPERR_KEY) {
769	rv = NS_NOTFOUND;
770	continue;
771	} else if (rv != 0) {
772	free(result);
773	rv = NS_UNAVAIL;
774	continue;
775	}
776	}
777	/* We need room at least for the line, a string NUL
778	* terminator, alignment padding, and one (char *)
779	* pointer for the member list terminator.
780	*/
781	if (resultlen >= bufsize - _ALIGNBYTES - sizeof(char *))
782	goto erange;
783	memcpy(buffer, result, resultlen);
784	buffer[resultlen] = '\0';
785	free(result);
786	rv = __gr_match_entry(buffer, resultlen, how, name, gid);
787	if (rv == NS_SUCCESS)
788	rv = __gr_parse_entry(buffer, resultlen, grp,
789	&buffer[resultlen+1], bufsize - resultlen - 1,
790	errnop);
791	} while (how == nss_lt_all && !(rv & NS_TERMINATE));
792	fin:
793	if (rv == NS_SUCCESS && retval != NULL)
794	(struct group *)retval = grp;
795	return (rv);
796	erange:
797	*errnop = ERANGE;
798	return (NS_RETURN);
799	}
800	#endif /* YP */
801
802
803
804	/*
805	* compat backend
806	*/
807	static void
808	compat_endstate(void *p)
809	{
810	struct compat_state *st;
811
812	if (p == NULL)
813	return;
814	st = (struct compat_state *)p;
815	free(st->name);
816	if (st->fp != NULL)
817	fclose(st->fp);
818	free(p);
819	}
820
821
822	static int
823	compat_setgrent(void retval, void mdata, va_list ap)
824	{
825	static const ns_src compatsrc[] = {
826	#ifdef YP
827	{ NSSRC_NIS, NS_SUCCESS },
828	#endif
829	{ NULL, 0 }
830	};
831	ns_dtab dtab[] = {
832	#ifdef HESIOD
833	{ NSSRC_DNS, dns_setgrent, NULL },
834	#endif
835	#ifdef YP
836	{ NSSRC_NIS, nis_setgrent, NULL },
837	#endif
838	{ NULL, NULL, NULL }
839	};
840	struct compat_state *st;
841	int rv, stayopen;
842
843	#define set_setent(x, y) do { \
844	int i; \
845	\
846	for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \
847	x[i].mdata = (void *)y; \
848	} while (0)
849
850	rv = compat_getstate(&st);
851	if (rv != 0)
852	return (NS_UNAVAIL);
853	switch ((enum constants)mdata) {
854	case SETGRENT:
855	stayopen = va_arg(ap, int);
856	if (st->fp != NULL)
857	rewind(st->fp);
858	else if (stayopen)
859	st->fp = fopen(_PATH_GROUP, "r");
860	set_setent(dtab, mdata);
861	(void)_nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "setgrent",
862	compatsrc, 0);
863	break;
864	case ENDGRENT:
865	if (st->fp != NULL) {
866	fclose(st->fp);
867	st->fp = NULL;
868	}
869	set_setent(dtab, mdata);
870	(void)_nsdispatch(NULL, dtab, NSDB_GROUP_COMPAT, "endgrent",
871	compatsrc, 0);
872	break;
873	default:
874	break;
875	}
876	st->compat = COMPAT_MODE_OFF;
877	free(st->name);
878	st->name = NULL;
879	return (NS_UNAVAIL);
880	#undef set_setent
881	}
882
883
884	static int
885	compat_group(void retval, void mdata, va_list ap)
886	{
887	static const ns_src compatsrc[] = {
888	#ifdef YP
889	{ NSSRC_NIS, NS_SUCCESS },
890	#endif
891	{ NULL, 0 }
892	};
893	ns_dtab dtab[] = {
894	#ifdef YP
895	{ NSSRC_NIS, nis_group, NULL },
896	#endif
897	#ifdef HESIOD
898	{ NSSRC_DNS, dns_group, NULL },
899	#endif
900	{ NULL, NULL, NULL }
901	};
902	struct compat_state *st;
903	enum nss_lookup_type how;
904	const char name, line;
905	struct group *grp;
906	gid_t gid;
907	char buffer, p;
908	void *discard;
909	size_t bufsize, linesize;
910	int rv, stayopen, *errnop;
911
912	#define set_lookup_type(x, y) do { \
913	int i; \
914	\
915	for (i = 0; i < (sizeof(x)/sizeof(x[0])) - 1; i++) \
916	x[i].mdata = (void *)y; \
917	} while (0)
918
919	name = NULL;
920	gid = (gid_t)-1;
921	how = (enum nss_lookup_type)mdata;
922	switch (how) {
923	case nss_lt_name:
924	name = va_arg(ap, const char *);
925	break;
926	case nss_lt_id:
927	gid = va_arg(ap, gid_t);
928	break;
929	case nss_lt_all:
930	break;
931	default:
932	return (NS_NOTFOUND);
933	}
934	grp = va_arg(ap, struct group *);
935	buffer = va_arg(ap, char *);
936	bufsize = va_arg(ap, size_t);
937	errnop = va_arg(ap, int *);
938	*errnop = compat_getstate(&st);
939	if (*errnop != 0)
940	return (NS_UNAVAIL);
941	if (st->fp == NULL &&
942	((st->fp = fopen(_PATH_GROUP, "r")) == NULL)) {
943	*errnop = errno;
944	rv = NS_UNAVAIL;
945	goto fin;
946	}
947	if (how == nss_lt_all)
948	stayopen = 1;
949	else {
950	rewind(st->fp);
951	stayopen = st->stayopen;
952	}
953	docompat:
954	switch (st->compat) {
955	case COMPAT_MODE_ALL:
956	set_lookup_type(dtab, how);
957	switch (how) {
958	case nss_lt_all:
959	rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
960	"getgrent_r", compatsrc, grp, buffer, bufsize,
961	errnop);
962	break;
963	case nss_lt_id:
964	rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
965	"getgrgid_r", compatsrc, gid, grp, buffer, bufsize,
966	errnop);
967	break;
968	case nss_lt_name:
969	rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
970	"getgrnam_r", compatsrc, name, grp, buffer,
971	bufsize, errnop);
972	break;
973	}
974	if (rv & NS_TERMINATE)
975	goto fin;
976	st->compat = COMPAT_MODE_OFF;
977	break;
978	case COMPAT_MODE_NAME:
979	set_lookup_type(dtab, nss_lt_name);
980	rv = _nsdispatch(&discard, dtab, NSDB_GROUP_COMPAT,
981	"getgrnam_r", compatsrc, st->name, grp, buffer, bufsize,
982	errnop);
983	switch (rv) {
984	case NS_SUCCESS:
985	switch (how) {
986	case nss_lt_name:
987	if (strcmp(name, grp->gr_name) != 0)
988	rv = NS_NOTFOUND;
989	break;
990	case nss_lt_id:
991	if (gid != grp->gr_gid)
992	rv = NS_NOTFOUND;
993	break;
994	default:
995	break;
996	}
997	break;
998	case NS_RETURN:
999	goto fin;
1000	default:
1001	break;
1002	}
1003	free(st->name);
1004	st->name = NULL;
1005	st->compat = COMPAT_MODE_OFF;
1006	if (rv == NS_SUCCESS)
1007	goto fin;
1008	break;
1009	default:
1010	break;
1011	}
1012	rv = NS_NOTFOUND;
1013	while ((line = fgetln(st->fp, &linesize)) != NULL) {
1014	if (line[linesize-1] == '\n')
1015	linesize--;
1016	if (linesize > 2 && line[0] == '+') {
1017	p = memchr(&line[1], ':', linesize);
1018	if (p == NULL \|\| p == &line[1])
1019	st->compat = COMPAT_MODE_ALL;
1020	else {
1021	st->name = malloc(p - line);
1022	if (st->name == NULL) {
1023	syslog(LOG_ERR,
1024	"getgrent memory allocation failure");
1025	*errnop = ENOMEM;
1026	rv = NS_UNAVAIL;
1027	break;
1028	}
1029	memcpy(st->name, &line[1], p - line - 1);
1030	st->name[p - line - 1] = '\0';
1031	st->compat = COMPAT_MODE_NAME;
1032	}
1033	goto docompat;
1034	}
1035	rv = __gr_match_entry(line, linesize, how, name, gid);
1036	if (rv != NS_SUCCESS)
1037	continue;
1038	/* We need room at least for the line, a string NUL
1039	* terminator, alignment padding, and one (char *)
1040	* pointer for the member list terminator.
1041	*/
1042	if (bufsize <= linesize + _ALIGNBYTES + sizeof(char *)) {
1043	*errnop = ERANGE;
1044	rv = NS_RETURN;
1045	break;
1046	}
1047	memcpy(buffer, line, linesize);
1048	buffer[linesize] = '\0';
1049	rv = __gr_parse_entry(buffer, linesize, grp,
1050	&buffer[linesize + 1], bufsize - linesize - 1, errnop);
1051	if (rv & NS_TERMINATE)
1052	break;
1053	}
1054	fin:
1055	if (!stayopen && st->fp != NULL) {
1056	fclose(st->fp);
1057	st->fp = NULL;
1058	}
1059	if (rv == NS_SUCCESS && retval != NULL)
1060	(struct group *)retval = grp;
1061	return (rv);
1062	#undef set_lookup_type
1063	}
1064
1065
1066	/*
1067	* common group line matching and parsing
1068	*/
1069	int
1070	__gr_match_entry(const char *line, size_t linesize, enum nss_lookup_type how,
1071	const char *name, gid_t gid)
1072	{
1073	size_t namesize;
1074	const char p, eol;
1075	char *q;
1076	unsigned long n;
1077	int i, needed;
1078
1079	if (linesize == 0 \|\| is_comment_line(line, linesize))
1080	return (NS_NOTFOUND);
1081	switch (how) {
1082	case nss_lt_name: needed = 1; break;
1083	case nss_lt_id: needed = 2; break;
1084	default: needed = 2; break;
1085	}
1086	eol = &line[linesize];
1087	for (p = line, i = 0; i < needed && p < eol; p++)
1088	if (*p == ':')
1089	i++;
1090	if (i < needed)
1091	return (NS_NOTFOUND);
1092	switch (how) {
1093	case nss_lt_name:
1094	namesize = strlen(name);
1095	if (namesize + 1 == (size_t)(p - line) &&
1096	memcmp(line, name, namesize) == 0)
1097	return (NS_SUCCESS);
1098	break;
1099	case nss_lt_id:
1100	n = strtoul(p, &q, 10);
1101	if (q < eol && *q == ':' && gid == (gid_t)n)
1102	return (NS_SUCCESS);
1103	break;
1104	case nss_lt_all:
1105	return (NS_SUCCESS);
1106	default:
1107	break;
1108	}
1109	return (NS_NOTFOUND);
1110	}
1111
1112
1113	int
1114	__gr_parse_entry(char line, size_t linesize, struct group grp, char *membuf,
1115	size_t membufsize, int *errnop)
1116	{
1117	char s_gid, s_mem, p, *members;
1118	unsigned long n;
1119	int maxmembers;
1120
1121	memset(grp, 0, sizeof(*grp));
1122	members = (char **)_ALIGN(membuf);
1123	membufsize -= (char *)members - membuf;
1124	maxmembers = membufsize / sizeof(*members);
1125	if (maxmembers <= 0 \|\|
1126	(grp->gr_name = strsep(&line, ":")) == NULL \|\|
1127	grp->gr_name[0] == '\0' \|\|
1128	(grp->gr_passwd = strsep(&line, ":")) == NULL \|\|
1129	(s_gid = strsep(&line, ":")) == NULL \|\|
1130	s_gid[0] == '\0')
1131	return (NS_NOTFOUND);
1132	s_mem = line;
1133	n = strtoul(s_gid, &s_gid, 10);
1134	if (s_gid[0] != '\0')
1135	return (NS_NOTFOUND);
1136	grp->gr_gid = (gid_t)n;
1137	grp->gr_mem = members;
1138	while (maxmembers > 1 && s_mem != NULL) {
1139	p = strsep(&s_mem, ",");
1140	if (p != NULL && *p != '\0') {
1141	*members++ = p;
1142	maxmembers--;
1143	}
1144	}
1145	*members = NULL;
1146	if (s_mem == NULL)
1147	return (NS_SUCCESS);
1148	else {
1149	*errnop = ERANGE;
1150	return (NS_RETURN);
1151	}
1152	}

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