1*9e66e6d7Sabs /* $NetBSD: initgroups.c,v 1.22 2012/06/25 22:32:43 abs Exp $ */
22c4d3c4cScgd
361f28255Scgd /*
4fedcc257Smycroft * Copyright (c) 1983, 1993
5fedcc257Smycroft * The Regents of the University of California. All rights reserved.
661f28255Scgd *
761f28255Scgd * Redistribution and use in source and binary forms, with or without
861f28255Scgd * modification, are permitted provided that the following conditions
961f28255Scgd * are met:
1061f28255Scgd * 1. Redistributions of source code must retain the above copyright
1161f28255Scgd * notice, this list of conditions and the following disclaimer.
1261f28255Scgd * 2. Redistributions in binary form must reproduce the above copyright
1361f28255Scgd * notice, this list of conditions and the following disclaimer in the
1461f28255Scgd * documentation and/or other materials provided with the distribution.
15eb7c1594Sagc * 3. Neither the name of the University nor the names of its contributors
1661f28255Scgd * may be used to endorse or promote products derived from this software
1761f28255Scgd * without specific prior written permission.
1861f28255Scgd *
1961f28255Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2061f28255Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2161f28255Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2261f28255Scgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2361f28255Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2461f28255Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2561f28255Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2661f28255Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2761f28255Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2861f28255Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2961f28255Scgd * SUCH DAMAGE.
3061f28255Scgd */
3161f28255Scgd
3270e0aeb1Schristos #include <sys/cdefs.h>
3361f28255Scgd #if defined(LIBC_SCCS) && !defined(lint)
342c4d3c4cScgd #if 0
352c4d3c4cScgd static char sccsid[] = "@(#)initgroups.c 8.1 (Berkeley) 6/4/93";
362c4d3c4cScgd #else
37*9e66e6d7Sabs __RCSID("$NetBSD: initgroups.c,v 1.22 2012/06/25 22:32:43 abs Exp $");
382c4d3c4cScgd #endif
3961f28255Scgd #endif /* LIBC_SCCS and not lint */
4061f28255Scgd
4170e0aeb1Schristos #include "namespace.h"
4261f28255Scgd #include <sys/param.h>
4361f28255Scgd
44b48252f3Slukem #include <assert.h>
45fedcc257Smycroft #include <stdio.h>
463ba2c075Sjtc #include <unistd.h>
47fa36c878Sdsl #include <stdlib.h>
48fa36c878Sdsl #include <errno.h>
4961f28255Scgd
5043fa6fe3Sjtc #ifdef __weak_alias
__weak_alias(initgroups,_initgroups)5160549036Smycroft __weak_alias(initgroups,_initgroups)
5243fa6fe3Sjtc #endif
5343fa6fe3Sjtc
5461f28255Scgd int
55*9e66e6d7Sabs initgroups(const char *uname, gid_t agroup)
5661f28255Scgd {
57fa36c878Sdsl gid_t groups_list[NGROUPS];
58853e41b3Sperry int ngroups;
59fa36c878Sdsl gid_t *groups = groups_list;
60fa36c878Sdsl int rval;
6161f28255Scgd
62b48252f3Slukem _DIAGASSERT(uname != NULL);
63b48252f3Slukem
64ac1e0f51Smycroft ngroups = NGROUPS;
65fa36c878Sdsl if (getgrouplist(uname, agroup, groups, &ngroups) == -1) {
66fa36c878Sdsl int maxgroups = ngroups;
67fa36c878Sdsl groups = calloc((size_t)maxgroups, sizeof *groups);
68fa36c878Sdsl if (groups == NULL)
69fa36c878Sdsl return -1;
70fa36c878Sdsl if (getgrouplist(uname, agroup, groups, &ngroups) == -1)
71fa36c878Sdsl ngroups = maxgroups;
72fa36c878Sdsl }
73fa36c878Sdsl rval = setgroups(ngroups, groups);
74fa36c878Sdsl if (rval == -1 && errno == EINVAL) {
75fa36c878Sdsl int ng = (int)sysconf(_SC_NGROUPS_MAX);
76fa36c878Sdsl if (ng > 0 && ng < ngroups)
77fa36c878Sdsl rval = setgroups(ng, groups);
78fa36c878Sdsl }
79fa36c878Sdsl if (groups != groups_list)
80fa36c878Sdsl free(groups);
81fa36c878Sdsl return rval;
8261f28255Scgd }
83