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getgrouplist.c revision 1.4 
      1 /*	$NetBSD: getgrouplist.c,v 1.4 1995/02/25 13:41:09 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1991, 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)getgrouplist.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: getgrouplist.c,v 1.4 1995/02/25 13:41:09 cgd Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 /*
     45  * get credential
     46  */
     47 #include <sys/types.h>
     48 #include <string.h>
     49 #include <grp.h>
     50 
     51 int
     52 getgrouplist(uname, agroup, groups, grpcnt)
     53 	const char *uname;
     54 	int agroup;
     55 	register int *groups;
     56 	int *grpcnt;
     57 {
     58 	register struct group *grp;
     59 	register struct passwd *pw;
     60 	register int i, ngroups;
     61 	int ret, maxgroups;
     62 
     63 	ret = 0;
     64 	ngroups = 0;
     65 	maxgroups = *grpcnt;
     66 	/*
     67 	 * When installing primary group, duplicate it;
     68 	 * the first element of groups is the effective gid
     69 	 * and will be overwritten when a setgid file is executed.
     70 	 */
     71 	groups[ngroups++] = agroup;
     72 	if (maxgroups > 1)
     73 		groups[ngroups++] = agroup;
     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 (i = 0; grp->gr_mem[i]; i++) {
     82 			if (!strcmp(grp->gr_mem[i], uname)) {
     83 				if (ngroups >= maxgroups) {
     84 					ret = -1;
     85 					goto out;
     86 				}
     87 				groups[ngroups++] = grp->gr_gid;
     88 				break;
     89 			}
     90 		}
     91 	}
     92 out:
     93 	endgrent();
     94 	*grpcnt = ngroups;
     95 	return (ret);
     96 }
     97