ypmatch_cache.c revision 1.9 
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 1.9 2002/07/31 22:28:32 deraadt 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#define YPMATCHCACHE
51#include "ypinternal.h"
52
53int _yplib_cache = 5;
54
55static bool_t
56ypmatch_add(const char *map, const char *key, u_int keylen, char *val,
57    u_int vallen)
58{
59	struct ypmatch_ent *ep;
60	time_t t;
61
62	if (keylen == 0 || vallen == 0)
63		return (0);
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(const char *map, const char *key, u_int keylen, char **val,
120    u_int *vallen)
121{
122	struct ypmatch_ent *ep;
123	time_t          t;
124
125	if (ypmc == NULL)
126		return 0;
127
128	(void) time(&t);
129
130	for (ep = ypmc; ep; ep = ep->next) {
131		if (ep->keylen != keylen)
132			continue;
133		if (strcmp(ep->map, map))
134			continue;
135		if (memcmp(ep->key, key, keylen))
136			continue;
137		if (t > ep->expire_t)
138			continue;
139
140		*val = ep->val;
141		*vallen = ep->vallen;
142		return 1;
143	}
144	return 0;
145}
146
147int
148yp_match(const char *indomain, const char *inmap, const char *inkey,
149    int inkeylen, char **outval, int *outvallen)
150{
151	struct dom_binding *ysd;
152	struct ypresp_val yprv;
153	struct timeval  tv;
154	struct ypreq_key yprk;
155	int tries = 0, r;
156
157	if (indomain == NULL || *indomain == '\0' ||
158	    strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
159	    *inmap == '\0' || strlen(inmap) > YPMAXMAP ||
160	    inkey == NULL || inkeylen == 0 || inkeylen >= YPMAXRECORD)
161		return YPERR_BADARGS;
162
163	*outval = NULL;
164	*outvallen = 0;
165
166again:
167	if (_yp_dobind(indomain, &ysd) != 0)
168		return YPERR_DOMAIN;
169
170#ifdef YPMATCHCACHE
171	if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
172	    inkeylen, &yprv.val.valdat_val, &yprv.val.valdat_len)) {
173		*outvallen = yprv.val.valdat_len;
174		if ((*outval = malloc(*outvallen + 1)) == NULL) {
175			_yp_unbind(ysd);
176			return YPERR_YPERR;
177		}
178		(void)memcpy(*outval, yprv.val.valdat_val, *outvallen);
179		(*outval)[*outvallen] = '\0';
180		_yp_unbind(ysd);
181		return 0;
182	}
183#endif
184
185	tv.tv_sec = _yplib_timeout;
186	tv.tv_usec = 0;
187
188	yprk.domain = (char *)indomain;
189	yprk.map = (char *)inmap;
190	yprk.key.keydat_val = (char *) inkey;
191	yprk.key.keydat_len = inkeylen;
192
193	memset(&yprv, 0, sizeof yprv);
194
195	r = clnt_call(ysd->dom_client, YPPROC_MATCH,
196	    xdr_ypreq_key, &yprk, xdr_ypresp_val, &yprv, tv);
197	if (r != RPC_SUCCESS) {
198		if (tries++)
199			clnt_perror(ysd->dom_client, "yp_match: clnt_call");
200		ysd->dom_vers = -1;
201		goto again;
202	}
203	if (!(r = ypprot_err(yprv.stat))) {
204		*outvallen = yprv.val.valdat_len;
205		if ((*outval = malloc(*outvallen + 1)) == NULL) {
206			r = YPERR_YPERR;
207			goto out;
208		}
209		(void)memcpy(*outval, yprv.val.valdat_val, *outvallen);
210		(*outval)[*outvallen] = '\0';
211#ifdef YPMATCHCACHE
212		if (strcmp(_yp_domain, indomain) == 0)
213			if (!ypmatch_add(inmap, inkey, inkeylen,
214			    *outval, *outvallen))
215				r = YPERR_RESRC;
216#endif
217	}
218out:
219	xdr_free(xdr_ypresp_val, (char *) &yprv);
220	_yp_unbind(ysd);
221	return r;
222}
223
224int
225yp_next(const char *indomain, const char *inmap, const char *inkey,
226    int inkeylen, char **outkey, int *outkeylen, char **outval, int *outvallen)
227{
228	struct ypresp_key_val yprkv;
229	struct ypreq_key yprk;
230	struct dom_binding *ysd;
231	struct timeval  tv;
232	int tries = 0, r;
233
234	if (indomain == NULL || *indomain == '\0' ||
235	    strlen(indomain) > YPMAXDOMAIN || inmap == NULL ||
236	    *inmap == '\0' || strlen(inmap) > YPMAXMAP ||
237	    inkeylen == 0 || inkeylen >= YPMAXRECORD)
238		return YPERR_BADARGS;
239
240	*outkey = *outval = NULL;
241	*outkeylen = *outvallen = 0;
242
243again:
244	if (_yp_dobind(indomain, &ysd) != 0)
245		return YPERR_DOMAIN;
246
247	tv.tv_sec = _yplib_timeout;
248	tv.tv_usec = 0;
249
250	yprk.domain = (char *)indomain;
251	yprk.map = (char *)inmap;
252	yprk.key.keydat_val = (char *)inkey;
253	yprk.key.keydat_len = inkeylen;
254	(void)memset(&yprkv, 0, sizeof yprkv);
255
256	r = clnt_call(ysd->dom_client, YPPROC_NEXT,
257	    xdr_ypreq_key, &yprk, xdr_ypresp_key_val, &yprkv, tv);
258	if (r != RPC_SUCCESS) {
259		if (tries++)
260			clnt_perror(ysd->dom_client, "yp_next: clnt_call");
261		ysd->dom_vers = -1;
262		goto again;
263	}
264	if (!(r = ypprot_err(yprkv.stat))) {
265		*outkeylen = yprkv.key.keydat_len;
266		if ((*outkey = malloc(*outkeylen + 1)) == NULL)
267			r = YPERR_RESRC;
268		else {
269			(void)memcpy(*outkey, yprkv.key.keydat_val, *outkeylen);
270			(*outkey)[*outkeylen] = '\0';
271		}
272		*outvallen = yprkv.val.valdat_len;
273		if ((*outval = malloc(*outvallen + 1)) == NULL)
274			r = YPERR_RESRC;
275		else {
276			(void)memcpy(*outval, yprkv.val.valdat_val, *outvallen);
277			(*outval)[*outvallen] = '\0';
278		}
279	}
280	xdr_free(xdr_ypresp_key_val, (char *) &yprkv);
281	_yp_unbind(ysd);
282	return r;
283}
284