1 /* $NetBSD: getgrent.c,v 1.34.2.1 1999/04/27 14:10:58 perry Exp $ */
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 * Portions Copyright (c) 1994, Jason Downs. All Rights Reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)getgrent.c 8.2 (Berkeley) 3/21/94
36 * $FreeBSD: src/lib/libc/gen/getgrent.c,v 1.17.6.1 2001/03/05 08:56:02 obrien Exp $
37 * $DragonFly: src/lib/libc/gen/getgrent.c,v 1.4 2005/04/27 12:36:31 joerg Exp $
42 #include <sys/types.h>
50 static struct group _gr_group;
51 static int _gr_stayopen;
53 static int grscan(int, gid_t, const char *);
54 static int start_gr(void);
58 #include <rpcsvc/yp_prot.h>
59 #include <rpcsvc/ypclnt.h>
60 static int _gr_stepping_yp;
61 static int _gr_yp_enabled;
62 static int _getypgroup(struct group *, const char *, const char *);
63 static int _nextypgroup(struct group *);
66 /* initial size for malloc and increase steps for realloc */
68 #define MAXLINELENGTH 256
70 static char **members; /* list of group members */
71 static int maxgrp; /* current length of **mebers */
72 static char *line; /* temp buffer for group line */
73 static int maxlinelength; /* current length of *line */
76 * Lines longer than MAXLINELENGTHLIMIT will be counted as an error.
77 * <= 0 disable check for maximum line length
78 * 256K is enough for 64,000 uids
80 #define MAXLINELENGTHLIMIT (256 * 1024)
81 #define GROUP_IGNORE_COMMENTS 1 /* allow comments in /etc/group */
86 if (!_gr_fp && !start_gr()) {
91 if (_gr_stepping_yp) {
92 if (_nextypgroup(&_gr_group))
98 if (!grscan(0, 0, NULL))
101 if(_gr_group.gr_name[0] == '+' && _gr_group.gr_name[1]) {
102 _getypgroup(&_gr_group, &_gr_group.gr_name[1],
104 } else if(_gr_group.gr_name[0] == '+') {
105 if (!_nextypgroup(&_gr_group))
115 getgrnam(const char *name)
124 rval = grscan(1, 0, name);
126 if(rval == -1 && (_gr_yp_enabled < 0 || (_gr_yp_enabled &&
127 _gr_group.gr_name[0] == '+'))) {
128 if (!(rval = _getypgroup(&_gr_group, name, "group.byname")))
134 return (rval) ? &_gr_group : NULL;
147 rval = grscan(1, gid, NULL);
149 if(rval == -1 && _gr_yp_enabled) {
151 snprintf(buf, sizeof buf, "%d", (unsigned)gid);
152 if (!(rval = _getypgroup(&_gr_group, buf, "group.bygid")))
158 return (rval) ? &_gr_group : NULL;
168 _gr_fp = fopen(_PATH_GROUP, "r");
169 if(!_gr_fp) return 0;
172 * This is a disgusting hack, used to determine when YP is enabled.
173 * This would be easier if we had a group database to go along with
174 * the password database.
180 while((my_line = fgetln(_gr_fp, &linelen)) != NULL) {
181 if(my_line[0] == '+') {
182 if(my_line[1] && my_line[1] != ':' && !_gr_yp_enabled) {
194 if (maxlinelength == 0) {
195 if ((line = (char *)malloc(MAXLINELENGTH)) == NULL)
197 maxlinelength += MAXLINELENGTH;
201 if ((members = (char **) malloc(sizeof(char **) *
213 return setgroupent(0);
217 setgroupent(int stayopen)
221 _gr_stayopen = stayopen;
235 (void)fclose(_gr_fp);
241 grscan(int search, gid_t gid, const char *name)
254 if (fgets(line, maxlinelength, _gr_fp) == NULL)
257 if (!index(line, '\n')) {
262 /* don't allocate infinite memory */
263 if (MAXLINELENGTHLIMIT > 0 &&
264 maxlinelength >= MAXLINELENGTHLIMIT)
267 if ((line = reallocf(line,
268 (maxlinelength + MAXLINELENGTH))) == NULL)
271 if (fgets(line + maxlinelength - 1,
272 MAXLINELENGTH + 1, _gr_fp) == NULL)
275 maxlinelength += MAXLINELENGTH;
276 } while (!index(line + maxlinelength -
277 MAXLINELENGTH - 1, '\n'));
280 #ifdef GROUP_IGNORE_COMMENTS
282 * Ignore comments: ^[ \t]*#
284 for (cp = line; *cp != '\0'; cp++)
285 if (*cp != ' ' && *cp != '\t')
287 if (*cp == '#' || *cp == '\0')
293 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
297 * XXX We need to be careful to avoid proceeding
298 * past this point under certain circumstances or
299 * we risk dereferencing null pointers down below.
301 if (_gr_group.gr_name[0] == '+') {
302 if (strlen(_gr_group.gr_name) == 1) {
312 cp = &_gr_group.gr_name[1];
313 if (search && name != NULL)
314 if (strcmp(cp, name))
316 if (!_getypgroup(&_gr_group, cp,
319 if (search && name == NULL)
320 if (gid != _gr_group.gr_gid)
322 /* We're going to override -- tell the world. */
327 if (_gr_group.gr_name[0] == '+')
330 if (search && name) {
331 if(strcmp(_gr_group.gr_name, name)) {
336 if ((cp = strsep(&bp, ":\n")) == NULL) {
342 if (strlen(cp) || !_ypfound)
343 _gr_group.gr_passwd = cp;
345 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
348 if (!(cp = strsep(&bp, ":\n"))) {
358 * Hurm. Should we be doing this? We allow UIDs to
359 * be overridden -- what about GIDs?
363 _gr_group.gr_gid = atoi(cp);
364 if (search && name == NULL && _gr_group.gr_gid != gid)
367 if (bp == NULL) /* !!! Must check for this! */
370 if ((cp = strsep(&bp, ":\n")) == NULL)
373 if (!strlen(cp) && _ypfound)
380 for (m = members; ; bp++) {
381 if (m == (members + maxgrp - 1)) {
382 if ((members = (char **)
385 (maxgrp + MAXGRP))) == NULL)
387 m = members + maxgrp - 1;
396 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
402 } else if (cp == NULL)
406 _gr_group.gr_mem = members;
417 _gr_breakout_yp(struct group *gr, char *result)
423 * XXX If 's' ends up being a NULL pointer, punt on this group.
424 * It means the NIS group entry is badly formatted and should
427 if ((s = strsep(&result, ":")) == NULL) return 0; /* name */
430 if ((s = strsep(&result, ":")) == NULL) return 0; /* password */
433 if ((s = strsep(&result, ":")) == NULL) return 0; /* gid */
434 gr->gr_gid = atoi(s);
436 if ((s = result) == NULL) return 0;
439 for (m = members; ; s++) {
440 if (m == members + maxgrp - 1) {
441 if ((members = (char **)reallocf(members,
442 sizeof(char **) * (maxgrp + MAXGRP))) == NULL)
444 m = members + maxgrp - 1;
453 } else if (*s == '\0' || *s == '\n' || *s == ' ') {
459 } else if (cp == NULL) {
463 _gr_group.gr_mem = members;
469 static char *_gr_yp_domain;
472 _getypgroup(struct group *gr, const char *name, const char *map)
475 static char resultbuf[YPMAXRECORD + 2];
479 if(yp_get_default_domain(&_gr_yp_domain))
483 if(yp_match(_gr_yp_domain, map, name, strlen(name),
484 &result, &resultlen))
487 s = strchr(result, '\n');
490 if (strlcpy(resultbuf, result, sizeof(resultbuf)) >= sizeof(resultbuf))
493 return(_gr_breakout_yp(gr, resultbuf));
499 _nextypgroup(struct group *gr)
503 char *lastkey, *result;
504 static char resultbuf[YPMAXRECORD + 2];
509 if(yp_get_default_domain(&_gr_yp_domain))
513 if(!_gr_stepping_yp) {
515 rv = yp_first(_gr_yp_domain, "group.byname",
516 &key, &keylen, &result, &resultlen);
525 rv = yp_next(_gr_yp_domain, "group.byname", key, keylen,
526 &key, &keylen, &result, &resultlen);
534 if(resultlen > sizeof(resultbuf)) {
539 strncpy(resultbuf, result, resultlen);
540 resultbuf[resultlen] = '\0';
542 if((result = strchr(resultbuf, '\n')) != NULL)
544 if (_gr_breakout_yp(gr, resultbuf))