getgrouplist.c revision 124208 
1/*
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include "includes.h"
31
32#ifndef HAVE_GETGROUPLIST
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char rcsid[] = "$OpenBSD: getgrouplist.c,v 1.9 2003/06/25 21:16:47 deraadt Exp $";
36#endif /* LIBC_SCCS and not lint */
37
38/*
39 * get credential
40 */
41#include <sys/types.h>
42#include <string.h>
43#include <unistd.h>
44#include <grp.h>
45
46int
47getgrouplist(uname, agroup, groups, grpcnt)
48	const char *uname;
49	gid_t agroup;
50	register gid_t *groups;
51	int *grpcnt;
52{
53	register struct group *grp;
54	register int i, ngroups;
55	int ret, maxgroups;
56	int bail;
57
58	ret = 0;
59	ngroups = 0;
60	maxgroups = *grpcnt;
61
62	/*
63	 * install primary group
64	 */
65	if (ngroups >= maxgroups) {
66		*grpcnt = ngroups;
67		return (-1);
68	}
69	groups[ngroups++] = agroup;
70
71	/*
72	 * Scan the group file to find additional groups.
73	 */
74	setgrent();
75	while ((grp = getgrent())) {
76		if (grp->gr_gid == agroup)
77			continue;
78		for (bail = 0, i = 0; bail == 0 && i < ngroups; i++)
79			if (groups[i] == grp->gr_gid)
80				bail = 1;
81		if (bail)
82			continue;
83		for (i = 0; grp->gr_mem[i]; i++) {
84			if (!strcmp(grp->gr_mem[i], uname)) {
85				if (ngroups >= maxgroups) {
86					ret = -1;
87					goto out;
88				}
89				groups[ngroups++] = grp->gr_gid;
90				break;
91			}
92		}
93	}
94out:
95	endgrent();
96	*grpcnt = ngroups;
97	return (ret);
98}
99
100#endif /* HAVE_GETGROUPLIST */
101