1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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/param.h>
33
34 #include "namespace.h"
35 #include <err.h>
36 #include "un-namespace.h"
37 #include <errno.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <unistd.h>
41
42 int
initgroups(const char * uname,gid_t agroup)43 initgroups(const char *uname, gid_t agroup)
44 {
45 int ngroups, ret;
46 long ngroups_max;
47 gid_t *groups;
48
49 /*
50 * Provide space for one group more than possible to allow
51 * setgroups to fail and set errno.
52 */
53 ngroups_max = sysconf(_SC_NGROUPS_MAX) + 2;
54 if ((groups = malloc(sizeof(*groups) * ngroups_max)) == NULL)
55 return (ENOMEM);
56
57 ngroups = (int)ngroups_max;
58 getgrouplist(uname, agroup, groups, &ngroups);
59 ret = setgroups(ngroups, groups);
60 free(groups);
61 return (ret);
62 }
63