ypmatch_cache.c revision 1.4 
1/*
2 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@theos.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by Theo de Raadt.
16 * 4. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
20 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char *rcsid = "$OpenBSD: ypmatch_cache.c,v 1.4 1996/08/19 08:35:12 tholo Exp $";
34#endif /* LIBC_SCCS and not lint */
35
36#include <sys/param.h>
37#include <sys/types.h>
38#include <sys/socket.h>
39#include <sys/file.h>
40#include <sys/uio.h>
41#include <errno.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include <rpc/rpc.h>
47#include <rpc/xdr.h>
48#include <rpcsvc/yp.h>
49#include <rpcsvc/ypclnt.h>
50#include "ypinternal.h"
51
52int _yplib_cache = 5;
53
54static bool_t
55ypmatch_add(map, key, keylen, val, vallen)
56	const char     *map;
57	const char     *key;
58	u_int           keylen;
59	char           *val;
60	u_int           vallen;
61{
62	struct ypmatch_ent *ep;
63	time_t t;
64
65	(void)time(&t);
66
67	for (ep = ypmc; ep; ep = ep->next)
68		if (ep->expire_t < t)
69			break;
70	if (ep == NULL) {
71		if ((ep = malloc(sizeof *ep)) == NULL)
72			return 0;
73		(void)memset(ep, 0, sizeof *ep);
74		if (ypmc)
75			ep->next = ypmc;
76		ypmc = ep;
77	}
78
79	if (ep->key) {
80		free(ep->key);
81		ep->key = NULL;
82	}
83	if (ep->val) {
84		free(ep->val);
85		ep->val = NULL;
86	}
87
88	if ((ep->key = malloc(keylen)) == NULL)
89		return 0;
90
91	if ((ep->val = malloc(vallen)) == NULL) {
92		free(ep->key);
93		ep->key = NULL;
94		return 0;
95	}
96
97	ep->keylen = keylen;
98	ep->vallen = vallen;
99
100	(void)memcpy(ep->key, key, ep->keylen);
101	(void)memcpy(ep->val, val, ep->vallen);
102
103	if (ep->map) {
104		if (strcmp(ep->map, map)) {
105			free(ep->map);
106			if ((ep->map = strdup(map)) == NULL)
107				return 0;
108		}
109	} else {
110		if ((ep->map = strdup(map)) == NULL)
111			return 0;
112	}
113
114	ep->expire_t = t + _yplib_cache;
115	return 1;
116}
117
118static bool_t
119ypmatch_find(map, key, keylen, val, vallen)
120	const char     *map;
121	const char     *key;
122	u_int           keylen;
123	char          **val;
124	u_int          *vallen;
125{
126	struct ypmatch_ent *ep;
127	time_t          t;
128
129	if (ypmc == NULL)
130		return 0;
131
132	(void) time(&t);
133
134	for (ep = ypmc; ep; ep = ep->next) {
135		if (ep->keylen != keylen)
136			continue;
137		if (strcmp(ep->map, map))
138			continue;
139		if (memcmp(ep->key, key, keylen))
140			continue;
141		if (t > ep->expire_t)
142			continue;
143
144		*val = ep->val;
145		*vallen = ep->vallen;
146		return 1;
147	}
148	return 0;
149}
150
151int
152yp_match(indomain, inmap, inkey, inkeylen, outval, outvallen)
153	const char     *indomain;
154	const char     *inmap;
155	const char     *inkey;
156	int             inkeylen;
157	char          **outval;
158	int            *outvallen;
159{
160	struct dom_binding *ysd;
161	struct ypresp_val yprv;
162	struct timeval  tv;
163	struct ypreq_key yprk;
164	int             r;
165
166	if (indomain == NULL || *indomain == '\0' ||
167	    strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
168	    *inmap == '\0' || strlen(inmap) > YPMAXMAP ||
169	    inkey == NULL || inkeylen == 0)
170		return YPERR_BADARGS;
171
172	*outval = NULL;
173	*outvallen = 0;
174
175again:
176	if (_yp_dobind(indomain, &ysd) != 0)
177		return YPERR_DOMAIN;
178
179#ifdef YPMATCHCACHE
180	if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
181	    inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
182		*outvallen = yprv.val.valdat_len;
183		if ((*outval = malloc(*outvallen + 1)) == NULL) {
184			_yp_unbind(ysd);
185			return YPERR_YPERR;
186		}
187		(void)memcpy(*outval, yprv.val.valdat_val, *outvallen);
188		(*outval)[*outvallen] = '\0';
189		_yp_unbind(ysd);
190		return 0;
191	}
192#endif
193
194	tv.tv_sec = _yplib_timeout;
195	tv.tv_usec = 0;
196
197	yprk.domain = (char *)indomain;
198	yprk.map = (char *)inmap;
199	yprk.key.keydat_val = (char *) inkey;
200	yprk.key.keydat_len = inkeylen;
201
202	memset(&yprv, 0, sizeof yprv);
203
204	r = clnt_call(ysd->dom_client, YPPROC_MATCH,
205	    xdr_ypreq_key, &yprk, xdr_ypresp_val, &yprv, tv);
206	if (r != RPC_SUCCESS) {
207		clnt_perror(ysd->dom_client, "yp_match: clnt_call");
208		ysd->dom_vers = -1;
209		goto again;
210	}
211	if (!(r = ypprot_err(yprv.stat))) {
212		*outvallen = yprv.val.valdat_len;
213		if ((*outval = malloc(*outvallen + 1)) == NULL) {
214			r = YPERR_YPERR;
215			goto out;
216		}
217		(void)memcpy(*outval, yprv.val.valdat_val, *outvallen);
218		(*outval)[*outvallen] = '\0';
219#ifdef YPMATCHCACHE
220		if (strcmp(_yp_domain, indomain) == 0)
221			if (!ypmatch_add(inmap, inkey, inkeylen,
222			    *outval, *outvallen))
223				r = YPERR_RESRC;
224#endif
225	}
226out:
227	xdr_free(xdr_ypresp_val, (char *) &yprv);
228	_yp_unbind(ysd);
229	return r;
230}
231
232int
233yp_next(indomain, inmap, inkey, inkeylen, outkey, outkeylen, outval, outvallen)
234	const char     *indomain;
235	const char     *inmap;
236	const char     *inkey;
237	int             inkeylen;
238	char          **outkey;
239	int            *outkeylen;
240	char          **outval;
241	int            *outvallen;
242{
243	struct ypresp_key_val yprkv;
244	struct ypreq_key yprk;
245	struct dom_binding *ysd;
246	struct timeval  tv;
247	int             r;
248
249	if (indomain == NULL || *indomain == '\0' ||
250	    strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
251	    *inmap == '\0' || strlen(inmap) > YPMAXMAP)
252		return YPERR_BADARGS;
253
254	*outkey = *outval = NULL;
255	*outkeylen = *outvallen = 0;
256
257again:
258	if (_yp_dobind(indomain, &ysd) != 0)
259		return YPERR_DOMAIN;
260
261	tv.tv_sec = _yplib_timeout;
262	tv.tv_usec = 0;
263
264	yprk.domain = (char *)indomain;
265	yprk.map = (char *)inmap;
266	yprk.key.keydat_val = (char *)inkey;
267	yprk.key.keydat_len = inkeylen;
268	(void)memset(&yprkv, 0, sizeof yprkv);
269
270	r = clnt_call(ysd->dom_client, YPPROC_NEXT,
271	    xdr_ypreq_key, &yprk, xdr_ypresp_key_val, &yprkv, tv);
272	if (r != RPC_SUCCESS) {
273		clnt_perror(ysd->dom_client, "yp_next: clnt_call");
274		ysd->dom_vers = -1;
275		goto again;
276	}
277	if (!(r = ypprot_err(yprkv.stat))) {
278		*outkeylen = yprkv.key.keydat_len;
279		if ((*outkey = malloc(*outkeylen + 1)) == NULL)
280			r = YPERR_RESRC;
281		else {
282			(void)memcpy(*outkey, yprkv.key.keydat_val, *outkeylen);
283			(*outkey)[*outkeylen] = '\0';
284		}
285		*outvallen = yprkv.val.valdat_len;
286		if ((*outval = malloc(*outvallen + 1)) == NULL)
287			r = YPERR_RESRC;
288		else {
289			(void)memcpy(*outval, yprkv.val.valdat_val, *outvallen);
290			(*outval)[*outvallen] = '\0';
291		}
292	}
293	xdr_free(xdr_ypresp_key_val, (char *) &yprkv);
294	_yp_unbind(ysd);
295	return r;
296}
297