1 /* $NetBSD: initgroups.c,v 1.22 2012/06/25 22:32:43 abs Exp $ */
2
3 /*
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)initgroups.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: initgroups.c,v 1.22 2012/06/25 22:32:43 abs Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include "namespace.h"
42 #include <sys/param.h>
43
44 #include <assert.h>
45 #include <stdio.h>
46 #include <unistd.h>
47 #include <stdlib.h>
48 #include <errno.h>
49
50 #ifdef __weak_alias
__weak_alias(initgroups,_initgroups)51 __weak_alias(initgroups,_initgroups)
52 #endif
53
54 int
55 initgroups(const char *uname, gid_t agroup)
56 {
57 gid_t groups_list[NGROUPS];
58 int ngroups;
59 gid_t *groups = groups_list;
60 int rval;
61
62 _DIAGASSERT(uname != NULL);
63
64 ngroups = NGROUPS;
65 if (getgrouplist(uname, agroup, groups, &ngroups) == -1) {
66 int maxgroups = ngroups;
67 groups = calloc((size_t)maxgroups, sizeof *groups);
68 if (groups == NULL)
69 return -1;
70 if (getgrouplist(uname, agroup, groups, &ngroups) == -1)
71 ngroups = maxgroups;
72 }
73 rval = setgroups(ngroups, groups);
74 if (rval == -1 && errno == EINVAL) {
75 int ng = (int)sysconf(_SC_NGROUPS_MAX);
76 if (ng > 0 && ng < ngroups)
77 rval = setgroups(ng, groups);
78 }
79 if (groups != groups_list)
80 free(groups);
81 return rval;
82 }
83