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initgroups.c revision 1.21.56.1 
      1 /*	$NetBSD: initgroups.c,v 1.21.56.1 2012/10/30 18:58:47 yamt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)initgroups.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: initgroups.c,v 1.21.56.1 2012/10/30 18:58:47 yamt Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <sys/param.h>
     43 
     44 #include <assert.h>
     45 #include <stdio.h>
     46 #include <unistd.h>
     47 #include <stdlib.h>
     48 #include <errno.h>
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(initgroups,_initgroups)
     52 #endif
     53 
     54 int
     55 initgroups(const char *uname, gid_t agroup)
     56 {
     57 	gid_t groups_list[NGROUPS];
     58 	int ngroups;
     59 	gid_t *groups = groups_list;
     60 	int rval;
     61 
     62 	_DIAGASSERT(uname != NULL);
     63 
     64 	ngroups = NGROUPS;
     65 	if (getgrouplist(uname, agroup, groups, &ngroups) == -1) {
     66 		int maxgroups = ngroups;
     67 		groups = calloc((size_t)maxgroups, sizeof *groups);
     68 		if (groups == NULL)
     69 			return -1;
     70 		if (getgrouplist(uname, agroup, groups, &ngroups) == -1)
     71 			ngroups = maxgroups;
     72 	}
     73 	rval = setgroups(ngroups, groups);
     74 	if (rval == -1 && errno == EINVAL) {
     75 		int ng = (int)sysconf(_SC_NGROUPS_MAX);
     76 		if (ng > 0 && ng < ngroups)
     77 			rval = setgroups(ng, groups);
     78 	}
     79 	if (groups != groups_list)
     80 		free(groups);
     81 	return rval;
     82 }
     83