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 weak _getgrnam = getgrnam
31 #pragma weak _getgrgid = getgrgid
32
33 #include "lint.h"
34 #include <sys/types.h>
35 #include <grp.h>
36 #include <nss_dbdefs.h>
37 #include <stdio.h>
38 #include "tsd.h"
39
40 #ifdef NSS_INCLUDE_UNSAFE
41
42 extern size_t _nss_get_bufsizes(int arg);
43
44 /*
45 * Ye olde non-reentrant interface (MT-unsafe, caveat utor)
46 */
47
48 static void
free_grbuf(void * arg)49 free_grbuf(void *arg)
50 {
51 nss_XbyY_buf_t **buffer = arg;
52
53 NSS_XbyY_FREE(buffer);
54 }
55
56 static nss_XbyY_buf_t *
get_grbuf(int max_buf)57 get_grbuf(int max_buf)
58 {
59 nss_XbyY_buf_t **buffer =
60 tsdalloc(_T_GRBUF, sizeof (nss_XbyY_buf_t *), free_grbuf);
61 nss_XbyY_buf_t *b;
62 size_t blen;
63
64 if (buffer == NULL)
65 return (NULL);
66 if (max_buf == 0)
67 blen = _nss_get_bufsizes(0); /* default size */
68 else
69 blen = sysconf(_SC_GETGR_R_SIZE_MAX); /* max size */
70 if (*buffer) {
71 if ((*buffer)->buflen >= blen) /* existing size fits */
72 return (*buffer);
73 NSS_XbyY_FREE(buffer); /* existing is too small */
74 }
75 b = NSS_XbyY_ALLOC(buffer, sizeof (struct group), blen);
76 return (b);
77 }
78
79 struct group *
getgrgid(gid_t gid)80 getgrgid(gid_t gid)
81 {
82 nss_XbyY_buf_t *b = get_grbuf(0);
83 struct group *ret;
84
85 if (b == NULL)
86 return (NULL);
87
88 ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);
89 if (ret == NULL && errno == ERANGE) {
90 b = get_grbuf(1);
91 if (b == NULL)
92 return (NULL);
93 ret = getgrgid_r(gid, b->result, b->buffer, b->buflen);
94 }
95 return (ret);
96 }
97
98 struct group *
getgrnam(const char * nam)99 getgrnam(const char *nam)
100 {
101 nss_XbyY_buf_t *b = get_grbuf(0);
102 struct group *ret;
103
104 if (b == NULL)
105 return (NULL);
106
107 ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);
108 if (ret == NULL && errno == ERANGE && nam != NULL) {
109 b = get_grbuf(1);
110 if (b == NULL)
111 return (NULL);
112 ret = getgrnam_r(nam, b->result, b->buffer, b->buflen);
113 }
114 return (ret);
115 }
116
117 struct group *
getgrent(void)118 getgrent(void)
119 {
120 nss_XbyY_buf_t *b = get_grbuf(1);
121
122 return (b == NULL ? NULL :
123 getgrent_r(b->result, b->buffer, b->buflen));
124 }
125
126 struct group *
fgetgrent(FILE * f)127 fgetgrent(FILE *f)
128 {
129 nss_XbyY_buf_t *b = get_grbuf(1);
130
131 return (b == NULL ? NULL :
132 fgetgrent_r(f, b->result, b->buffer, b->buflen));
133 }
134
135 #endif /* NSS_INCLUDE_UNSAFE */
136