801 lines
16 KiB
C
801 lines
16 KiB
C
/* $NetBSD: getnetgrent.c,v 1.29 2002/05/26 14:03:20 wiz Exp $ */
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/*
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* Copyright (c) 1994 Christos Zoulas
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* 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 Christos Zoulas.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* 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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__RCSID("$NetBSD: getnetgrent.c,v 1.29 2002/05/26 14:03:20 wiz Exp $");
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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 <assert.h>
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#include <ctype.h>
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#include <db.h>
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#include <err.h>
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#include <fcntl.h>
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#define _NETGROUP_PRIVATE
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#include <netgroup.h>
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#include <nsswitch.h>
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#include <stdarg.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 <stringlist.h>
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/ypclnt.h>
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#include <rpcsvc/yp_prot.h>
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#endif
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#ifdef __weak_alias
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__weak_alias(endnetgrent,_endnetgrent)
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__weak_alias(getnetgrent,_getnetgrent)
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__weak_alias(innetgr,_innetgr)
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__weak_alias(setnetgrent,_setnetgrent)
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#endif
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#define _NG_STAR(s) (((s) == NULL || *(s) == '\0') ? _ngstar : s)
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#define _NG_EMPTY(s) ((s) == NULL ? "" : s)
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#define _NG_ISSPACE(p) (isspace((unsigned char) (p)) || (p) == '\n')
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static const char _ngstar[] = "*";
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static struct netgroup *_nghead = (struct netgroup *)NULL;
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static struct netgroup *_nglist = (struct netgroup *)NULL;
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static DB *_ng_db;
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static int getstring __P((char **, int, __aconst char **));
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static struct netgroup *getnetgroup __P((char **));
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static int lookup __P((char *, char **, int));
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static int addgroup __P((StringList *, char *));
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static int in_check __P((const char *, const char *,
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const char *, struct netgroup *));
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static int in_find __P((StringList *, char *, const char *,
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const char *, const char *));
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static char *in_lookup1 __P((const char *, const char *, int));
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static int in_lookup __P((const char *, const char *,
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const char *, int));
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static const ns_src default_files_nis[] = {
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{ NSSRC_FILES, NS_SUCCESS | NS_NOTFOUND },
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#ifdef YP
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{ NSSRC_NIS, NS_SUCCESS },
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#endif
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{ 0 }
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};
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/*
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* getstring(): Get a string delimited by the character, skipping leading and
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* trailing blanks and advancing the pointer
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*/
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static int
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getstring(pp, del, str)
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char **pp;
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int del;
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char __aconst **str;
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{
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size_t len;
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char *sp, *ep, *dp;
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_DIAGASSERT(pp != NULL);
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_DIAGASSERT(str != NULL);
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/* skip leading blanks */
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for (sp = *pp; *sp && _NG_ISSPACE(*sp); sp++)
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continue;
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/* accumulate till delimiter or space */
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for (ep = sp; *ep && *ep != del && !_NG_ISSPACE(*ep); ep++)
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continue;
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/* hunt for the delimiter */
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for (dp = ep; *dp && *dp != del && _NG_ISSPACE(*dp); dp++)
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continue;
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if (*dp != del) {
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*str = NULL;
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return 0;
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}
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*pp = ++dp;
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len = (ep - sp) + 1;
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if (len > 1) {
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dp = malloc(len);
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if (dp == NULL)
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return 0;
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memcpy(dp, sp, len);
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dp[len - 1] = '\0';
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} else
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dp = NULL;
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*str = dp;
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return 1;
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}
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/*
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* getnetgroup(): Parse a netgroup, and advance the pointer
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*/
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static struct netgroup *
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getnetgroup(pp)
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char **pp;
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{
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struct netgroup *ng;
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_DIAGASSERT(pp != NULL);
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_DIAGASSERT(*pp != NULL);
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ng = malloc(sizeof(struct netgroup));
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if (ng == NULL)
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return NULL;
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(*pp)++; /* skip '(' */
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if (!getstring(pp, ',', &ng->ng_host))
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goto badhost;
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if (!getstring(pp, ',', &ng->ng_user))
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goto baduser;
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if (!getstring(pp, ')', &ng->ng_domain))
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goto baddomain;
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#ifdef DEBUG_NG
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{
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char buf[1024];
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(void) fprintf(stderr, "netgroup %s\n",
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_ng_print(buf, sizeof(buf), ng));
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}
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#endif
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return ng;
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baddomain:
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if (ng->ng_user)
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free((char *)ng->ng_user);
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baduser:
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if (ng->ng_host)
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free((char *)ng->ng_host);
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badhost:
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free(ng);
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return NULL;
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}
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static int _local_lookup __P((void *, void *, va_list));
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/*ARGSUSED*/
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static int
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_local_lookup(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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{
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char *name = va_arg(ap, char *);
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char **line = va_arg(ap, char **);
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int bywhat = va_arg(ap, int);
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DBT key, data;
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size_t len;
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char *ks;
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int r;
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if (_ng_db == NULL)
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return NS_UNAVAIL;
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len = strlen(name) + 2;
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ks = malloc(len);
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if (ks == NULL)
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return NS_UNAVAIL;
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ks[0] = bywhat;
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memcpy(&ks[1], name, len - 1);
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key.data = (u_char *) ks;
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key.size = len;
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r = (_ng_db->get) (_ng_db, &key, &data, 0);
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free(ks);
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switch (r) {
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case 0:
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break;
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case 1:
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return NS_NOTFOUND;
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case -1:
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/* XXX: call endnetgrent() here ? */
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return NS_UNAVAIL;
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}
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*line = strdup(data.data);
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if (*line == NULL)
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return NS_UNAVAIL;
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return NS_SUCCESS;
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}
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#ifdef YP
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static int _nis_lookup __P((void *, void *, va_list));
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/*ARGSUSED*/
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static int
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_nis_lookup(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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{
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char *name = va_arg(ap, char *);
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char **line = va_arg(ap, char **);
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int bywhat = va_arg(ap, int);
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static char *__ypdomain;
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int i;
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char *map = NULL;
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if(__ypdomain == NULL) {
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switch (yp_get_default_domain(&__ypdomain)) {
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case 0:
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break;
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case YPERR_RESRC:
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return NS_TRYAGAIN;
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default:
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return NS_UNAVAIL;
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}
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}
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switch (bywhat) {
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case _NG_KEYBYNAME:
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map = "netgroup";
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break;
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case _NG_KEYBYUSER:
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map = "netgroup.byuser";
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break;
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case _NG_KEYBYHOST:
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map = "netgroup.byhost";
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break;
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default:
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abort();
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}
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*line = NULL;
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switch (yp_match(__ypdomain, map, name, (int)strlen(name), line, &i)) {
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case 0:
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return NS_SUCCESS;
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case YPERR_KEY:
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if (*line)
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free(*line);
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return NS_NOTFOUND;
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default:
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if (*line)
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free(*line);
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return NS_UNAVAIL;
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}
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/* NOTREACHED */
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}
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#endif
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/*
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* lookup(): Find the given key in the database or yp, and return its value
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* in *line; returns 1 if key was found, 0 otherwise
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*/
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static int
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lookup(name, line, bywhat)
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char *name;
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char **line;
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int bywhat;
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{
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int r;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_local_lookup, NULL)
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NS_NIS_CB(_nis_lookup, NULL)
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{ 0 }
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};
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_DIAGASSERT(name != NULL);
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_DIAGASSERT(line != NULL);
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r = nsdispatch(NULL, dtab, NSDB_NETGROUP, "lookup", default_files_nis,
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name, line, bywhat);
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return (r == NS_SUCCESS) ? 1 : 0;
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}
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/*
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* _ng_parse(): Parse a line and return: _NG_ERROR: Syntax Error _NG_NONE:
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* line was empty or a comment _NG_GROUP: line had a netgroup definition,
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* returned in ng _NG_NAME: line had a netgroup name, returned in name
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*
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* Public since used by netgroup_mkdb
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*/
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int
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_ng_parse(p, name, ng)
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char **p;
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char **name;
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struct netgroup **ng;
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{
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_DIAGASSERT(p != NULL);
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_DIAGASSERT(*p != NULL);
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_DIAGASSERT(name != NULL);
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_DIAGASSERT(ng != NULL);
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while (**p) {
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if (**p == '#')
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/* comment */
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return _NG_NONE;
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while (**p && _NG_ISSPACE(**p))
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/* skipblank */
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(*p)++;
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if (**p == '(') {
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if ((*ng = getnetgroup(p)) == NULL)
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return _NG_ERROR;
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return _NG_GROUP;
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} else {
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char *np;
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size_t i;
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for (np = *p; **p && !_NG_ISSPACE(**p); (*p)++)
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continue;
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if (np != *p) {
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i = (*p - np) + 1;
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*name = malloc(i);
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if (*name == NULL)
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return _NG_ERROR;
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memcpy(*name, np, i);
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(*name)[i - 1] = '\0';
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return _NG_NAME;
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}
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}
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}
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return _NG_NONE;
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}
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/*
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* addgroup(): Recursively add all the members of the netgroup to this group.
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* returns 0 upon failure, nonzero upon success.
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* grp is not a valid pointer after return (either free(3)ed or allocated
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* to a stringlist). in either case, it shouldn't be used again.
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*/
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static int
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addgroup(sl, grp)
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StringList *sl;
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char *grp;
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{
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char *line, *p;
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struct netgroup *ng;
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char *name;
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_DIAGASSERT(sl != NULL);
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_DIAGASSERT(grp != NULL);
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#ifdef DEBUG_NG
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(void) fprintf(stderr, "addgroup(%s)\n", grp);
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#endif
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/* check for cycles */
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if (sl_find(sl, grp) != NULL) {
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free(grp);
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warnx("netgroup: Cycle in group `%s'", grp);
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return 0;
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}
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if (sl_add(sl, grp) == -1) {
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free(grp);
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return 0;
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}
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/* Lookup this netgroup */
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line = NULL;
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if (!lookup(grp, &line, _NG_KEYBYNAME)) {
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if (line != NULL)
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free(line);
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return 0;
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}
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p = line;
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for (;;) {
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switch (_ng_parse(&p, &name, &ng)) {
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case _NG_NONE:
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/* Done with the line */
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free(line);
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return 1;
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case _NG_GROUP:
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/* new netgroup */
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/* add to the list */
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ng->ng_next = _nglist;
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_nglist = ng;
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break;
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case _NG_NAME:
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/* netgroup name */
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if (!addgroup(sl, name))
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return 0;
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break;
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case _NG_ERROR:
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return 0;
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default:
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abort();
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}
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}
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}
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/*
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* in_check(): Compare the spec with the netgroup
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*/
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static int
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in_check(host, user, domain, ng)
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const char *host;
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const char *user;
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const char *domain;
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struct netgroup *ng;
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{
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/* host may be NULL */
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/* user may be NULL */
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/* domain may be NULL */
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_DIAGASSERT(ng != NULL);
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if ((host != NULL) && (ng->ng_host != NULL)
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&& strcmp(ng->ng_host, host) != 0)
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return 0;
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if ((user != NULL) && (ng->ng_user != NULL)
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&& strcmp(ng->ng_user, user) != 0)
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return 0;
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if ((domain != NULL) && (ng->ng_domain != NULL)
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&& strcmp(ng->ng_domain, domain) != 0)
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return 0;
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return 1;
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}
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/*
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* in_find(): Find a match for the host, user, domain spec.
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* grp is not a valid pointer after return (either free(3)ed or allocated
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* to a stringlist). in either case, it shouldn't be used again.
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*/
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static int
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in_find(sl, grp, host, user, domain)
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StringList *sl;
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char *grp;
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const char *host;
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const char *user;
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const char *domain;
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{
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char *line, *p;
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int i;
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struct netgroup *ng;
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char *name;
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_DIAGASSERT(sl != NULL);
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_DIAGASSERT(grp != NULL);
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/* host may be NULL */
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/* user may be NULL */
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/* domain may be NULL */
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#ifdef DEBUG_NG
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(void) fprintf(stderr, "in_find(%s)\n", grp);
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#endif
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/* check for cycles */
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if (sl_find(sl, grp) != NULL) {
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free(grp);
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warnx("netgroup: Cycle in group `%s'", grp);
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return 0;
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}
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if (sl_add(sl, grp) == -1) {
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free(grp);
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return 0;
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}
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/* Lookup this netgroup */
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line = NULL;
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if (!lookup(grp, &line, _NG_KEYBYNAME)) {
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if (line)
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free(line);
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return 0;
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}
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p = line;
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for (;;) {
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switch (_ng_parse(&p, &name, &ng)) {
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case _NG_NONE:
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/* Done with the line */
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free(line);
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return 0;
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case _NG_GROUP:
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/* new netgroup */
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i = in_check(host, user, domain, ng);
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if (ng->ng_host != NULL)
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free((char *)ng->ng_host);
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if (ng->ng_user != NULL)
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free((char *)ng->ng_user);
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if (ng->ng_domain != NULL)
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free((char *)ng->ng_domain);
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free(ng);
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if (i) {
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free(line);
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return 1;
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}
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break;
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case _NG_NAME:
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/* netgroup name */
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if (in_find(sl, name, host, user, domain)) {
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free(line);
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return 1;
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}
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break;
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case _NG_ERROR:
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free(line);
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return 0;
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default:
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abort();
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}
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}
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}
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/*
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* _ng_makekey(): Make a key from the two names given. The key is of the form
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|
* <name1>.<name2> Names strings are replaced with * if they are empty;
|
|
* Returns NULL if there's a problem.
|
|
*/
|
|
char *
|
|
_ng_makekey(s1, s2, len)
|
|
const char *s1, *s2;
|
|
size_t len;
|
|
{
|
|
char *buf;
|
|
|
|
/* s1 may be NULL */
|
|
/* s2 may be NULL */
|
|
|
|
buf = malloc(len);
|
|
if (buf != NULL)
|
|
(void) snprintf(buf, len, "%s.%s", _NG_STAR(s1), _NG_STAR(s2));
|
|
return buf;
|
|
}
|
|
|
|
void
|
|
_ng_print(buf, len, ng)
|
|
char *buf;
|
|
size_t len;
|
|
const struct netgroup *ng;
|
|
{
|
|
_DIAGASSERT(buf != NULL);
|
|
_DIAGASSERT(ng != NULL);
|
|
|
|
(void) snprintf(buf, len, "(%s,%s,%s)", _NG_EMPTY(ng->ng_host),
|
|
_NG_EMPTY(ng->ng_user), _NG_EMPTY(ng->ng_domain));
|
|
}
|
|
|
|
|
|
/*
|
|
* in_lookup1(): Fast lookup for a key in the appropriate map
|
|
*/
|
|
static char *
|
|
in_lookup1(key, domain, map)
|
|
const char *key;
|
|
const char *domain;
|
|
int map;
|
|
{
|
|
char *line;
|
|
size_t len;
|
|
char *ptr;
|
|
int res;
|
|
|
|
/* key may be NULL */
|
|
/* domain may be NULL */
|
|
|
|
len = (key ? strlen(key) : 1) + (domain ? strlen(domain) : 1) + 2;
|
|
ptr = _ng_makekey(key, domain, len);
|
|
if (ptr == NULL)
|
|
return NULL;
|
|
res = lookup(ptr, &line, map);
|
|
free(ptr);
|
|
return res ? line : NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* in_lookup(): Fast lookup for a key in the appropriate map
|
|
*/
|
|
static int
|
|
in_lookup(group, key, domain, map)
|
|
const char *group;
|
|
const char *key;
|
|
const char *domain;
|
|
int map;
|
|
{
|
|
size_t len;
|
|
char *ptr, *line;
|
|
|
|
_DIAGASSERT(group != NULL);
|
|
/* key may be NULL */
|
|
/* domain may be NULL */
|
|
|
|
if (domain != NULL) {
|
|
/* Domain specified; look in "group.domain" and "*.domain" */
|
|
if ((line = in_lookup1(key, domain, map)) == NULL)
|
|
line = in_lookup1(NULL, domain, map);
|
|
} else
|
|
line = NULL;
|
|
|
|
if (line == NULL) {
|
|
/*
|
|
* domain not specified or domain lookup failed; look in
|
|
* "group.*" and "*.*"
|
|
*/
|
|
if (((line = in_lookup1(key, NULL, map)) == NULL) &&
|
|
((line = in_lookup1(NULL, NULL, map)) == NULL))
|
|
return 0;
|
|
}
|
|
|
|
len = strlen(group);
|
|
|
|
for (ptr = line; (ptr = strstr(ptr, group)) != NULL;)
|
|
/* Make sure we did not find a substring */
|
|
if ((ptr != line && ptr[-1] != ',') ||
|
|
(ptr[len] != '\0' && strchr("\n\t ,", ptr[len]) == NULL))
|
|
ptr++;
|
|
else {
|
|
free(line);
|
|
return 1;
|
|
}
|
|
|
|
free(line);
|
|
return 0;
|
|
}
|
|
|
|
|
|
void
|
|
endnetgrent()
|
|
{
|
|
for (_nglist = _nghead; _nglist != NULL; _nglist = _nghead) {
|
|
_nghead = _nglist->ng_next;
|
|
if (_nglist->ng_host != NULL)
|
|
free((char *)_nglist->ng_host);
|
|
if (_nglist->ng_user != NULL)
|
|
free((char *)_nglist->ng_user);
|
|
if (_nglist->ng_domain != NULL)
|
|
free((char *)_nglist->ng_domain);
|
|
free(_nglist);
|
|
}
|
|
|
|
if (_ng_db) {
|
|
(void) (_ng_db->close) (_ng_db);
|
|
_ng_db = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
setnetgrent(ng)
|
|
const char *ng;
|
|
{
|
|
StringList *sl;
|
|
char *ng_copy;
|
|
|
|
_DIAGASSERT(ng != NULL);
|
|
|
|
sl = sl_init();
|
|
if (sl == NULL)
|
|
return;
|
|
|
|
/* Cleanup any previous storage */
|
|
if (_nghead != NULL)
|
|
endnetgrent();
|
|
|
|
if (_ng_db == NULL)
|
|
_ng_db = dbopen(_PATH_NETGROUP_DB, O_RDONLY, 0, DB_HASH, NULL);
|
|
|
|
ng_copy = strdup(ng);
|
|
if (ng_copy != NULL)
|
|
addgroup(sl, ng_copy);
|
|
_nghead = _nglist;
|
|
sl_free(sl, 1);
|
|
}
|
|
|
|
|
|
int
|
|
getnetgrent(host, user, domain)
|
|
const char **host;
|
|
const char **user;
|
|
const char **domain;
|
|
{
|
|
_DIAGASSERT(host != NULL);
|
|
_DIAGASSERT(user != NULL);
|
|
_DIAGASSERT(domain != NULL);
|
|
|
|
if (_nglist == NULL)
|
|
return 0;
|
|
|
|
*host = _nglist->ng_host;
|
|
*user = _nglist->ng_user;
|
|
*domain = _nglist->ng_domain;
|
|
|
|
_nglist = _nglist->ng_next;
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
int
|
|
innetgr(grp, host, user, domain)
|
|
const char *grp, *host, *user, *domain;
|
|
{
|
|
int found;
|
|
StringList *sl;
|
|
|
|
_DIAGASSERT(grp != NULL);
|
|
/* host may be NULL */
|
|
/* user may be NULL */
|
|
/* domain may be NULL */
|
|
|
|
if (_ng_db == NULL)
|
|
_ng_db = dbopen(_PATH_NETGROUP_DB, O_RDONLY, 0, DB_HASH, NULL);
|
|
|
|
/* Try the fast lookup first */
|
|
if (host != NULL && user == NULL) {
|
|
if (in_lookup(grp, host, domain, _NG_KEYBYHOST))
|
|
return 1;
|
|
} else if (host == NULL && user != NULL) {
|
|
if (in_lookup(grp, user, domain, _NG_KEYBYUSER))
|
|
return 1;
|
|
}
|
|
/* If a domainname is given, we would have found a match */
|
|
if (domain != NULL)
|
|
return 0;
|
|
|
|
/* Too bad need the slow recursive way */
|
|
sl = sl_init();
|
|
if (sl == NULL)
|
|
return 0;
|
|
found = in_find(sl, strdup(grp), host, user, domain);
|
|
sl_free(sl, 1);
|
|
|
|
return found;
|
|
}
|