getgrouplist.c revision 98937 
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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "includes.h"
35
36#ifndef HAVE_GETGROUPLIST
37
38#if defined(LIBC_SCCS) && !defined(lint)
39static char rcsid[] = "$OpenBSD: getgrouplist.c,v 1.7 1997/08/19 19:13:27 deraadt Exp $";
40#endif /* LIBC_SCCS and not lint */
41
42/*
43 * get credential
44 */
45#include <sys/types.h>
46#include <string.h>
47#include <grp.h>
48
49int
50getgrouplist(uname, agroup, groups, grpcnt)
51	const char *uname;
52	gid_t agroup;
53	register gid_t *groups;
54	int *grpcnt;
55{
56	register struct group *grp;
57	register int i, ngroups;
58	int ret, maxgroups;
59	int bail;
60
61	ret = 0;
62	ngroups = 0;
63	maxgroups = *grpcnt;
64
65	/*
66	 * install primary group
67	 */
68	if (ngroups >= maxgroups) {
69		*grpcnt = ngroups;
70		return (-1);
71	}
72	groups[ngroups++] = agroup;
73
74	/*
75	 * Scan the group file to find additional groups.
76	 */
77	setgrent();
78	while ((grp = getgrent())) {
79		if (grp->gr_gid == agroup)
80			continue;
81		for (bail = 0, i = 0; bail == 0 && i < ngroups; i++)
82			if (groups[i] == grp->gr_gid)
83				bail = 1;
84		if (bail)
85			continue;
86		for (i = 0; grp->gr_mem[i]; i++) {
87			if (!strcmp(grp->gr_mem[i], uname)) {
88				if (ngroups >= maxgroups) {
89					ret = -1;
90					goto out;
91				}
92				groups[ngroups++] = grp->gr_gid;
93				break;
94			}
95		}
96	}
97out:
98	endgrent();
99	*grpcnt = ngroups;
100	return (ret);
101}
102
103#endif /* HAVE_GETGROUPLIST */
104