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getgrouplist.c revision 1.2 
      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 #if defined(LIBC_SCCS) && !defined(lint)
     35 static char sccsid[] = "@(#)getgrouplist.c	8.1 (Berkeley) 6/4/93";
     36 #endif /* LIBC_SCCS and not lint */
     37 
     38 /*
     39  * get credential
     40  */
     41 #include <sys/types.h>
     42 #include <string.h>
     43 #include <grp.h>
     44 
     45 int
     46 getgrouplist(uname, agroup, groups, grpcnt)
     47 	const char *uname;
     48 	int agroup;
     49 	register int *groups;
     50 	int *grpcnt;
     51 {
     52 	register struct group *grp;
     53 	register struct passwd *pw;
     54 	register int i, ngroups;
     55 	int ret, maxgroups;
     56 
     57 	ret = 0;
     58 	ngroups = 0;
     59 	maxgroups = *grpcnt;
     60 	/*
     61 	 * When installing primary group, duplicate it;
     62 	 * the first element of groups is the effective gid
     63 	 * and will be overwritten when a setgid file is executed.
     64 	 */
     65 	groups[ngroups++] = agroup;
     66 	if (maxgroups > 1)
     67 		groups[ngroups++] = agroup;
     68 	/*
     69 	 * Scan the group file to find additional groups.
     70 	 */
     71 	setgrent();
     72 	while (grp = getgrent()) {
     73 		if (grp->gr_gid == agroup)
     74 			continue;
     75 		for (i = 0; grp->gr_mem[i]; i++) {
     76 			if (!strcmp(grp->gr_mem[i], uname)) {
     77 				if (ngroups >= maxgroups) {
     78 					ret = -1;
     79 					break;
     80 				}
     81 				groups[ngroups++] = grp->gr_gid;
     82 				break;
     83 			}
     84 		}
     85 	}
     86 	endgrent();
     87 	*grpcnt = ngroups;
     88 	return (ret);
     89 }
     90