1/*	$OpenBSD: getgrouplist.c,v 1.12 2005/08/08 08:05:34 espie Exp */
2/*
3 * Copyright (c) 1991, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31/* OPENBSD ORIGINAL: lib/libc/gen/getgrouplist.c */
32
33#include "includes.h"
34
35#ifndef HAVE_GETGROUPLIST
36
37/*
38 * get credential
39 */
40#include <sys/types.h>
41#include <string.h>
42#include <unistd.h>
43#include <grp.h>
44
45int
46getgrouplist(const char *uname, gid_t agroup, gid_t *groups, int *grpcnt)
47{
48	struct group *grp;
49	int i, ngroups;
50	int ret, maxgroups;
51	int bail;
52
53	ret = 0;
54	ngroups = 0;
55	maxgroups = *grpcnt;
56
57	/*
58	 * install primary group
59	 */
60	if (ngroups >= maxgroups) {
61		*grpcnt = ngroups;
62		return (-1);
63	}
64	groups[ngroups++] = agroup;
65
66	/*
67	 * Scan the group file to find additional groups.
68	 */
69	setgrent();
70	while ((grp = getgrent())) {
71		if (grp->gr_gid == agroup)
72			continue;
73		for (bail = 0, i = 0; bail == 0 && i < ngroups; i++)
74			if (groups[i] == grp->gr_gid)
75				bail = 1;
76		if (bail)
77			continue;
78		for (i = 0; grp->gr_mem[i]; i++) {
79			if (!strcmp(grp->gr_mem[i], uname)) {
80				if (ngroups >= maxgroups) {
81					ret = -1;
82					goto out;
83				}
84				groups[ngroups++] = grp->gr_gid;
85				break;
86			}
87		}
88	}
89out:
90	endgrent();
91	*grpcnt = ngroups;
92	return (ret);
93}
94
95#endif /* HAVE_GETGROUPLIST */
96