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initgroups.c revision 1.4 
      1 /*
      2  * Copyright (c) 1983 Regents of the University of California.
      3  * 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 = "from: @(#)initgroups.c	5.7 (Berkeley) 2/23/91";*/
     36 static char *rcsid = "$Id: initgroups.c,v 1.4 1994/03/30 03:51:32 cgd Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 /*
     40  * initgroups
     41  */
     42 #include <sys/param.h>
     43 #include <stdio.h>
     44 #include <string.h>
     45 #include <unistd.h>
     46 #include <grp.h>
     47 
     48 struct group *getgrent();
     49 
     50 int
     51 initgroups(uname, agroup)
     52 	const char *uname;
     53 	int agroup;
     54 {
     55 	gid_t groups[NGROUPS];
     56 	int ngroups = 0;
     57 	register struct group *grp;
     58 	register int i;
     59 
     60 	/*
     61 	 * If 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 	if (agroup >= 0) {
     66 		groups[ngroups++] = agroup;
     67 		groups[ngroups++] = agroup;
     68 	}
     69 	setgrent();
     70 	while (grp = getgrent()) {
     71 		if (grp->gr_gid == agroup)
     72 			continue;
     73 		for (i = 0; grp->gr_mem[i]; i++)
     74 			if (!strcmp(grp->gr_mem[i], uname)) {
     75 				if (ngroups == NGROUPS) {
     76 fprintf(stderr, "initgroups: %s is in too many groups\n", uname);
     77 					goto toomany;
     78 				}
     79 				groups[ngroups++] = grp->gr_gid;
     80 			}
     81 	}
     82 toomany:
     83 	endgrent();
     84 	if (setgroups(ngroups, groups) < 0) {
     85 		perror("setgroups");
     86 		return (-1);
     87 	}
     88 	return (0);
     89 }
     90