113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* $NetBSD: getgrouplist.c,v 1.17 2003/08/07 16:42:49 agc Exp $ */
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/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)getgrouplist.c 8.2 (Berkeley) 12/8/94";
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#else
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__RCSID("$NetBSD: getgrouplist.c,v 1.17 2003/08/07 16:42:49 agc Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*
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* get credential
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*/
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#include "namespace.h"
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#include <sys/param.h>
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#include <assert.h>
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#include <grp.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef __weak_alias
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__weak_alias(getgrouplist,_getgrouplist)
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#endif
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/*
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* _getgrent_user() is a libc-private function defined in getgrent.c which
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* use because certain name service types such as Hesiod lookup grouplists
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* by username rather than just iterating over the list of groups.
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*/
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struct group *_getgrent_user(const char *);
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int
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getgrouplist(uname, agroup, groups, grpcnt)
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const char *uname;
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gid_t agroup;
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gid_t *groups;
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int *grpcnt;
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{
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struct group *grp;
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int i, ngroups;
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int ret, maxgroups;
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_DIAGASSERT(uname != NULL);
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_DIAGASSERT(groups != NULL);
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_DIAGASSERT(grpcnt != NULL);
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ret = 0;
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ngroups = 0;
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maxgroups = *grpcnt;
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/*
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* install primary group
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*/
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if (ngroups < maxgroups)
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groups[ngroups] = agroup;
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else
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ret = -1;
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ngroups++;
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/*
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* Scan the group file to find additional groups.
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*/
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setgrent();
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nextgroup:
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while ((grp = _getgrent_user(uname)) != NULL) {
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if (grp->gr_gid == agroup)
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continue;
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for (i = 0; i < MIN(ngroups, maxgroups); i++) {
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if (grp->gr_gid == groups[i])
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goto nextgroup;
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}
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if (ngroups < maxgroups)
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groups[ngroups] = grp->gr_gid;
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else
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ret = -1;
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ngroups++;
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}
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endgrent();
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*grpcnt = ngroups;
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return (ret);
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}
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