1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 #pragma weak _getgrnam = getgrnam
33 #pragma weak _getgrgid = getgrgid
34
35 #include "lint.h"
36 #include <sys/types.h>
37 #include <grp.h>
38 #include <nss_dbdefs.h>
39 #include <stdio.h>
40 #include "tsd.h"
41
42 #ifdef NSS_INCLUDE_UNSAFE
43
44 extern size_t _nss_get_bufsizes(int arg);
45
46 /*
47 * Ye olde non-reentrant interface (MT-unsafe, caveat utor)
48 */
49
50 static void
free_grbuf(void * arg)51 free_grbuf(void *arg)
52 {
53 nss_XbyY_buf_t **buffer = arg;
54
55 NSS_XbyY_FREE(buffer);
56 }
57
58 static nss_XbyY_buf_t *
get_grbuf(int max_buf)59 get_grbuf(int max_buf)
60 {
61 nss_XbyY_buf_t **buffer =
62 tsdalloc(_T_GRBUF, sizeof (nss_XbyY_buf_t *), free_grbuf);
63 nss_XbyY_buf_t *b;
64 size_t blen;
65
66 if (buffer == NULL)
67 return (NULL);
68 if (max_buf == 0)
69 blen = _nss_get_bufsizes(0); /* default size */
70 else
71 blen = sysconf(_SC_GETGR_R_SIZE_MAX); /* max size */
72 if (*buffer) {
73 if ((*buffer)->buflen >= blen) /* existing size fits */
74 return (*buffer);
75 NSS_XbyY_FREE(buffer); /* existing is too small */
76 }
77 b = NSS_XbyY_ALLOC(buffer, sizeof (struct group), blen);
78 return (b);
79 }
80
81 struct group *
getgrgid(gid_t gid)82 getgrgid(gid_t gid)
83 {
84 nss_XbyY_buf_t *b = get_grbuf(0);
85 struct group *ret;
86
87 if (b == NULL)
88 return (NULL);
89
90 ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);
91 if (ret == NULL && errno == ERANGE) {
92 b = get_grbuf(1);
93 if (b == NULL)
94 return (NULL);
95 ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);
96 }
97 return (ret);
98 }
99
100 struct group *
getgrnam(const char * nam)101 getgrnam(const char *nam)
102 {
103 nss_XbyY_buf_t *b = get_grbuf(0);
104 struct group *ret;
105
106 if (b == NULL)
107 return (NULL);
108
109 ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);
110 if (ret == NULL && errno == ERANGE && nam != NULL) {
111 b = get_grbuf(1);
112 if (b == NULL)
113 return (NULL);
114 ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);
115 }
116 return (ret);
117 }
118
119 struct group *
getgrent(void)120 getgrent(void)
121 {
122 nss_XbyY_buf_t *b = get_grbuf(1);
123
124 return (b == NULL ? NULL :
125 getgrent_r(b->result, b->buffer, b->buflen));
126 }
127
128 struct group *
fgetgrent(FILE * f)129 fgetgrent(FILE *f)
130 {
131 nss_XbyY_buf_t *b = get_grbuf(1);
132
133 return (b == NULL ? NULL :
134 fgetgrent_r(f, b->result, b->buffer, b->buflen));
135 }
136
137 #endif /* NSS_INCLUDE_UNSAFE */
138