1/*	$NetBSD: yp_match.c,v 1.16 2003/12/10 12:06:25 agc Exp $	 */
2
3/*
4 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@fsa.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30#if defined(LIBC_SCCS) && !defined(lint)
31__RCSID("$NetBSD: yp_match.c,v 1.16 2003/12/10 12:06:25 agc Exp $");
32#endif
33
34#include "namespace.h"
35
36#include <assert.h>
37#include <stdlib.h>
38#include <string.h>
39#include <time.h>
40
41#include <rpc/rpc.h>
42#include <rpcsvc/yp_prot.h>
43#include <rpcsvc/ypclnt.h>
44#include "local.h"
45
46#define YPMATCHCACHE
47
48extern struct timeval _yplib_timeout;
49extern int _yplib_nerrs;
50extern char _yp_domain[];
51
52#ifdef __weak_alias
53__weak_alias(yp_match,_yp_match)
54#endif
55
56#ifdef YPMATCHCACHE
57int _yplib_cache = 5;
58
59static struct ypmatch_ent {
60	struct ypmatch_ent 	*next;
61	char     		*map, *key;
62	char           		*val;
63	int             	 keylen, vallen;
64	time_t          	 expire_t;
65} *ypmc;
66
67static bool_t ypmatch_add __P((const char *, const char *, int, char *, int));
68static bool_t ypmatch_find __P((const char *, const char *, int, const char **,
69    int *));
70
71static bool_t
72ypmatch_add(map, key, keylen, val, vallen)
73	const char     *map;
74	const char     *key;
75	int             keylen;
76	char           *val;
77	int             vallen;
78{
79	struct ypmatch_ent *ep;
80	time_t t;
81
82	_DIAGASSERT(map != NULL);
83	_DIAGASSERT(key != NULL);
84	_DIAGASSERT(val != NULL);
85
86	(void)time(&t);
87
88	for (ep = ypmc; ep; ep = ep->next)
89		if (ep->expire_t < t)
90			break;
91	if (ep == NULL) {
92		if ((ep = malloc(sizeof *ep)) == NULL)
93			return 0;
94		(void)memset(ep, 0, sizeof *ep);
95		if (ypmc)
96			ep->next = ypmc;
97		ypmc = ep;
98	}
99
100	if (ep->key) {
101		free(ep->key);
102		ep->key = NULL;
103	}
104	if (ep->val) {
105		free(ep->val);
106		ep->val = NULL;
107	}
108
109	if ((ep->key = malloc((size_t)keylen)) == NULL)
110		return 0;
111
112	if ((ep->val = malloc((size_t)vallen)) == NULL) {
113		free(ep->key);
114		ep->key = NULL;
115		return 0;
116	}
117
118	ep->keylen = keylen;
119	ep->vallen = vallen;
120
121	(void)memcpy(ep->key, key, (size_t)ep->keylen);
122	(void)memcpy(ep->val, val, (size_t)ep->vallen);
123
124	if (ep->map) {
125		if (strcmp(ep->map, map)) {
126			free(ep->map);
127			if ((ep->map = strdup(map)) == NULL)
128				return 0;
129		}
130	} else {
131		if ((ep->map = strdup(map)) == NULL)
132			return 0;
133	}
134
135	ep->expire_t = t + _yplib_cache;
136	return 1;
137}
138
139static bool_t
140ypmatch_find(map, key, keylen, val, vallen)
141	const char     *map;
142	const char     *key;
143	int             keylen;
144	const char    **val;
145	int            *vallen;
146{
147	struct ypmatch_ent *ep;
148	time_t          t;
149
150	_DIAGASSERT(map != NULL);
151	_DIAGASSERT(key != NULL);
152	_DIAGASSERT(val != NULL);
153
154	if (ypmc == NULL)
155		return 0;
156
157	(void) time(&t);
158
159	for (ep = ypmc; ep; ep = ep->next) {
160		if (ep->keylen != keylen)
161			continue;
162		if (strcmp(ep->map, map))
163			continue;
164		if (memcmp(ep->key, key, (size_t)keylen))
165			continue;
166		if (t > ep->expire_t)
167			continue;
168
169		*val = ep->val;
170		*vallen = ep->vallen;
171		return 1;
172	}
173	return 0;
174}
175#endif
176
177int
178yp_match(indomain, inmap, inkey, inkeylen, outval, outvallen)
179	const char     *indomain;
180	const char     *inmap;
181	const char     *inkey;
182	int             inkeylen;
183	char          **outval;
184	int            *outvallen;
185{
186	struct dom_binding *ysd;
187	struct ypresp_val yprv;
188	struct ypreq_key yprk;
189	int r, nerrs = 0;
190
191	if (outval == NULL || outvallen == NULL)
192		return YPERR_BADARGS;
193	*outval = NULL;
194	*outvallen = 0;
195
196	if (_yp_invalid_domain(indomain))
197		return YPERR_BADARGS;
198	if (inmap == NULL || *inmap == '\0'
199	    || strlen(inmap) > YPMAXMAP)
200		return YPERR_BADARGS;
201	if (inkey == NULL || inkeylen == 0)
202		return YPERR_BADARGS;
203
204again:
205	if (_yp_dobind(indomain, &ysd) != 0)
206		return YPERR_DOMAIN;
207
208#ifdef YPMATCHCACHE
209	if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
210			 inkeylen, &yprv.valdat.dptr, &yprv.valdat.dsize)) {
211		*outvallen = yprv.valdat.dsize;
212		if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
213			return YPERR_YPERR;
214		(void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
215		(*outval)[*outvallen] = '\0';
216		return 0;
217	}
218#endif
219
220	yprk.domain = indomain;
221	yprk.map = inmap;
222	yprk.keydat.dptr = __UNCONST(inkey);
223	yprk.keydat.dsize = inkeylen;
224
225	memset(&yprv, 0, sizeof yprv);
226
227	r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MATCH,
228		      (xdrproc_t)xdr_ypreq_key, &yprk,
229		      (xdrproc_t)xdr_ypresp_val, &yprv,
230		      _yplib_timeout);
231	if (r != RPC_SUCCESS) {
232		if (++nerrs == _yplib_nerrs) {
233			clnt_perror(ysd->dom_client, "yp_match: clnt_call");
234			nerrs = 0;
235		}
236		ysd->dom_vers = -1;
237		goto again;
238	}
239	if (!(r = ypprot_err(yprv.status))) {
240		*outvallen = yprv.valdat.dsize;
241		if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
242			return YPERR_YPERR;
243		(void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
244		(*outval)[*outvallen] = '\0';
245#ifdef YPMATCHCACHE
246		if (strcmp(_yp_domain, indomain) == 0)
247			if (!ypmatch_add(inmap, inkey, inkeylen,
248					 *outval, *outvallen))
249				r = YPERR_RESRC;
250#endif
251	}
252	xdr_free((xdrproc_t)xdr_ypresp_val, (char *)(void *)&yprv);
253	__yp_unbind(ysd);
254	if (r != 0) {
255		if (*outval) {
256			free(*outval);
257			*outval = NULL;
258		}
259	}
260	return r;
261}
262