386 lines
8.4 KiB
C
386 lines
8.4 KiB
C
/* $NetBSD: getgrent.c,v 1.21 1997/07/21 14:07:05 jtc Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* Portions Copyright (c) 1994, Jason Downs. 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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[] = "@(#)getgrent.c 8.2 (Berkeley) 3/21/94";
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#else
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__RCSID("$NetBSD: getgrent.c,v 1.21 1997/07/21 14:07:05 jtc Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <grp.h>
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#endif
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#ifdef __weak_alias
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__weak_alias(endgrent,_endgrent);
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__weak_alias(getgrent,_getgrent);
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__weak_alias(getgrgid,_getgrgid);
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__weak_alias(getgrnam,_getgrnam);
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__weak_alias(setgrent,_setgrent);
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__weak_alias(setgroupent,_setgroupent);
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#endif
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static FILE *_gr_fp;
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static struct group _gr_group;
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static int _gr_stayopen;
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static int grscan __P((int, gid_t, const char *));
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static int start_gr __P((void));
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#define MAXGRP 200
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static char *members[MAXGRP];
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#define MAXLINELENGTH 1024
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static char line[MAXLINELENGTH];
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#ifdef YP
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enum _ypmode { YPMODE_NONE, YPMODE_FULL, YPMODE_NAME };
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static enum _ypmode __ypmode;
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static char *__ypcurrent, *__ypdomain;
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static int __ypcurrentlen;
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#endif
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struct group *
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getgrent()
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{
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if ((!_gr_fp && !start_gr()) || !grscan(0, 0, NULL))
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return(NULL);
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return(&_gr_group);
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}
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struct group *
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getgrnam(name)
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const char *name;
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{
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int rval;
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if (!start_gr())
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return(NULL);
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rval = grscan(1, 0, name);
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if (!_gr_stayopen)
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endgrent();
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return(rval ? &_gr_group : NULL);
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}
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struct group *
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#ifdef __STDC__
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getgrgid(gid_t gid)
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#else
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getgrgid(gid)
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gid_t gid;
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#endif
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{
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int rval;
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if (!start_gr())
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return(NULL);
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rval = grscan(1, gid, NULL);
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if (!_gr_stayopen)
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endgrent();
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return(rval ? &_gr_group : NULL);
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}
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static int
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start_gr()
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{
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if (_gr_fp) {
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rewind(_gr_fp);
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#ifdef YP
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__ypmode = YPMODE_NONE;
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if (__ypcurrent)
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free(__ypcurrent);
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__ypcurrent = NULL;
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#endif
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return(1);
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}
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return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
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}
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void
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setgrent()
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{
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(void) setgroupent(0);
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}
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int
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setgroupent(stayopen)
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int stayopen;
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{
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if (!start_gr())
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return(0);
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_gr_stayopen = stayopen;
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return(1);
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}
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void
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endgrent()
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{
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if (_gr_fp) {
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(void)fclose(_gr_fp);
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_gr_fp = NULL;
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#ifdef YP
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__ypmode = YPMODE_NONE;
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if (__ypcurrent)
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free(__ypcurrent);
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__ypcurrent = NULL;
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#endif
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}
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}
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static int
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grscan(search, gid, name)
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int search;
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gid_t gid;
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const char *name;
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{
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char *cp, **m;
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char *bp, *ep;
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unsigned long id;
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#ifdef YP
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char *key, *data;
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int keylen, datalen;
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int r;
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char *grname = (char *)NULL;
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#endif
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for (;;) {
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#ifdef YP
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if (__ypmode != YPMODE_NONE) {
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if (!__ypdomain) {
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if (yp_get_default_domain(&__ypdomain)) {
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__ypmode = YPMODE_NONE;
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if (grname != (char *)NULL) {
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free(grname);
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grname = (char *)NULL;
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}
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continue;
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}
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}
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switch(__ypmode) {
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case YPMODE_FULL:
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data = NULL;
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if (__ypcurrent) {
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key = NULL;
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r = yp_next(__ypdomain, "group.byname",
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__ypcurrent, __ypcurrentlen,
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&key, &keylen, &data, &datalen);
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free(__ypcurrent);
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if (r != 0) {
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__ypcurrent = NULL;
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if (key)
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free(key);
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}
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else {
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__ypcurrent = key;
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__ypcurrentlen = keylen;
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}
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} else {
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r = yp_first(__ypdomain, "group.byname",
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&__ypcurrent, &__ypcurrentlen,
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&data, &datalen);
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}
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if (r != 0) {
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__ypmode = YPMODE_NONE;
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if (data)
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free(data);
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continue;
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}
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bcopy(data, line, datalen);
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free(data);
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break;
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case YPMODE_NAME:
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if (grname != (char *)NULL) {
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data = NULL;
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r = yp_match(__ypdomain, "group.byname",
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grname, strlen(grname),
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&data, &datalen);
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__ypmode = YPMODE_NONE;
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free(grname);
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grname = (char *)NULL;
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if (r != 0) {
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if (data)
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free(data);
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continue;
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}
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bcopy(data, line, datalen);
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free(data);
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} else {
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/* YP not available? */
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__ypmode = YPMODE_NONE;
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continue;
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}
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break;
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case YPMODE_NONE:
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abort(); /* Cannot happen */
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break;
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}
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line[datalen] = '\0';
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bp = line;
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goto parse;
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}
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#endif /* YP */
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if (!fgets(line, sizeof(line), _gr_fp))
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return(0);
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bp = line;
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/* skip lines that are too big */
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if (!strchr(line, '\n')) {
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int ch;
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while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
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;
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continue;
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}
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#ifdef YP
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if (line[0] == '+') {
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switch(line[1]) {
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case ':':
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case '\0':
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case '\n':
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if (_yp_check(NULL)) {
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if (!search) {
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__ypmode = YPMODE_FULL;
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continue;
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}
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if (!__ypdomain &&
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yp_get_default_domain(&__ypdomain))
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continue;
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data = NULL;
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if (name) {
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r = yp_match(__ypdomain,
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"group.byname",
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name, strlen(name),
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&data, &datalen);
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} else {
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char buf[20];
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snprintf(buf, sizeof(buf),
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"%u", gid);
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r = yp_match(__ypdomain,
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"group.bygid",
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buf, strlen(buf),
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&data, &datalen);
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}
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if (r != 0) {
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if (data)
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free(data);
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continue;
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}
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bcopy(data, line, datalen);
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free(data);
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line[datalen] = '\0';
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bp = line;
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_gr_group.gr_name = strsep(&bp, ":\n");
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_gr_group.gr_passwd =
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strsep(&bp, ":\n");
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if (!(cp = strsep(&bp, ":\n")))
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continue;
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if (name) {
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id = strtoul(cp, &ep, 10);
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if (id > GID_MAX || *ep != '\0')
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continue;
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_gr_group.gr_gid = (gid_t)id;
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} else
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_gr_group.gr_gid = gid;
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goto found_it;
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}
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break;
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default:
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if (_yp_check(NULL)) {
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char *tptr;
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tptr = strsep(&bp, ":\n");
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if (search && name &&
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strcmp(tptr, name))
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continue;
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__ypmode = YPMODE_NAME;
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grname = strdup(tptr + 1);
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continue;
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}
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break;
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}
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}
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parse:
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#endif /* YP */
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_gr_group.gr_name = strsep(&bp, ":\n");
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if (search && name && strcmp(_gr_group.gr_name, name))
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continue;
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_gr_group.gr_passwd = strsep(&bp, ":\n");
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if (!(cp = strsep(&bp, ":\n")))
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continue;
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id = strtoul(cp, &ep, 10);
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if (id > GID_MAX || *ep != '\0')
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continue;
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_gr_group.gr_gid = (gid_t)id;
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if (search && name == NULL && _gr_group.gr_gid != gid)
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continue;
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found_it:
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cp = NULL;
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if (bp == NULL)
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continue;
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for (m = _gr_group.gr_mem = members;; bp++) {
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if (m == &members[MAXGRP - 1])
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break;
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if (*bp == ',') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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cp = NULL;
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}
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} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
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if (cp) {
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*bp = '\0';
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*m++ = cp;
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}
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break;
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} else if (cp == NULL)
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cp = bp;
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}
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*m = NULL;
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return(1);
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}
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/* NOTREACHED */
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}
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