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/* initgroups.c: Replacement for the initgroups() function.
%%% portions-copyright-cmetz
Portions of this software are Copyright 1996 by Craig Metz, All Rights
Reserved. The Inner Net License Version 2 applies to these portions of
the software.
You should have received a copy of the license with this software. If
you didn't get a copy, you may request one from <license@inner.net>.
History:
Modified by cmetz for OPIE 2.2. Removed useless string.
Ifdef around headers. Use FUNCTION declarations.
Not everyone has multiple groups. Work around
lack of NGROUPS.
Originally from 4.3BSD Net/2.
*/
/*
* 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.
*/
/*
* initgroups
*/
#include "opie_cfg.h"
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif /* HAVE_SYS_PARAM_H */
#include <stdio.h>
#if HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING */
#if HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <grp.h>
#include "opie.h"
struct group *getgrent();
int initgroups FUNCTION((uname, agroup), const char *uname AND int agroup)
{
#if HAVE_SETGROUPS && HAVE_GETGROUPS
#if NGROUPS
int groups[NGROUPS];
#else /* NGROUPS */
#define STARTING_NGROUPS 32
int groups[STARTING_NGROUPS];
#endif /* NGROUPS */
int ngroups;
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
if (ngroups == NGROUPS) {
#else /* NGROUPS */
if (ngroups == STARTING_NGROUPS) {
#endif /* NGROUPS */
fprintf(stderr, "initgroups: %s is in too many groups\n", uname);
goto toomany;
}
groups[ngroups++] = grp->gr_gid;
}
}
toomany:
endgrent();
#if NGROUPS
if (setgroups(ngroups, groups) < 0) {
perror("setgroups");
return (-1);
}
#else /* NGROUPS */
ngroups++;
do {
if ((i = setgroups(--ngroups, groups) < 0) && (i != EINVAL)) {
perror("setgroups");
return (-1);
}
} while ((i < 0) && (ngroups > 0));
#endif /* NGROUPS */
#endif /* HAVE_SETGROUPS && HAVE_GETGROUPS */
return (0);
}
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