1/*
2 * initgroups.c - This file is part of the libc-8086/grp package for ELKS,
3 * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
4 *
5 *  This library is free software; you can redistribute it and/or
6 *  modify it under the terms of the GNU Library General Public
7 *  License as published by the Free Software Foundation; either
8 *  version 2 of the License, or (at your option) any later version.
9 *
10 *  This library is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 *  Library General Public License for more details.
14 *
15 *  You should have received a copy of the GNU Library General Public
16 *  License along with this library; if not, write to the Free
17 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 *
19 */
20
21#include <unistd.h>
22#include <string.h>
23#include <fcntl.h>
24#include "grp.h"
25#include "config.h"
26
27int initgroups(__const char *user, gid_t gid)
28{
29	register struct group *group;
30
31#ifndef GR_DYNAMIC_GROUP_LIST
32	gid_t group_list[GR_MAX_GROUPS];
33#else
34	gid_t *group_list = NULL;
35#endif
36	register char **tmp_mem;
37	int num_groups;
38	int grp_fd;
39
40
41	if ((grp_fd = open("/etc/group", O_RDONLY)) < 0)
42		return -1;
43
44	num_groups = 0;
45#ifdef GR_DYNAMIC_GROUP_LIST
46	group_list = (gid_t *) realloc(group_list, 1);
47#endif
48	group_list[num_groups] = gid;
49#ifndef GR_DYNAMIC_GROUP_LIST
50	while (num_groups < GR_MAX_GROUPS &&
51		   (group = __getgrent(grp_fd)) != NULL)
52#else
53	while ((group = __getgrent(grp_fd)) != NULL)
54#endif
55	{
56		if (group->gr_gid != gid);
57		{
58			tmp_mem = group->gr_mem;
59			while (*tmp_mem != NULL) {
60				if (!strcmp(*tmp_mem, user)) {
61					num_groups++;
62#ifdef GR_DYNAMIC_GROUP_LIST
63					group_list = (gid_t *) realloc(group_list, num_groups *
64						sizeof(gid_t *));
65#endif
66					group_list[num_groups] = group->gr_gid;
67				}
68				tmp_mem++;
69			}
70		}
71	}
72	close(grp_fd);
73	return setgroups(num_groups, group_list);
74}
75