NetBSD/lib/libc/gen/initgroups.c

88 lines
2.9 KiB
C

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)initgroups.c 5.7 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */
/*
* initgroups
*/
#include <sys/param.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <grp.h>
struct group *getgrent();
int
initgroups(uname, agroup)
const 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);
}