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BSD 4.3reno

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)initgroups.c	5.6 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */

/*
 * initgroups
 */
#include <stdio.h>
#include <sys/param.h>
#include <grp.h>

struct group *getgrent();

initgroups(uname, agroup)
	char *uname;
	int agroup;
{
	int groups[NGROUPS], ngroups = 0;
	register struct group *grp;
	register int i;

	/*
	 * If installing primary group, duplicate it;
	 * the first element of groups is the effective gid
	 * and will be overwritten when a setgid file is executed.
	 */
	if (agroup >= 0) {
		groups[ngroups++] = agroup;
		groups[ngroups++] = agroup;
	}
	setgrent();
	while (grp = getgrent()) {
		if (grp->gr_gid == agroup)
			continue;
		for (i = 0; grp->gr_mem[i]; i++)
			if (!strcmp(grp->gr_mem[i], uname)) {
				if (ngroups == NGROUPS) {
fprintf(stderr, "initgroups: %s is in too many groups\n", uname);
					goto toomany;
				}
				groups[ngroups++] = grp->gr_gid;
			}
	}
toomany:
	endgrent();
	if (setgroups(ngroups, groups) < 0) {
		perror("setgroups");
		return (-1);
	}
	return (0);
}

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