1 /* $NetBSD: yp_match.c,v 1.19 2012/03/20 16:30:26 matt 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 1.19 2012/03/20 16:30:26 matt 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
48 extern struct timeval _yplib_timeout;
49 extern int _yplib_nerrs;
50 extern int _yplib_bindtries;
51 extern char _yp_domain[];
52
53 #ifdef __weak_alias
54 __weak_alias(yp_match,_yp_match)
55 #endif
56
57 #ifdef YPMATCHCACHE
58 int _yplib_cache = 5;
59
60 static struct ypmatch_ent {
61 struct ypmatch_ent *next;
62 char *map, *key;
63 char *val;
64 int keylen, vallen;
65 time_t expire_t;
66 } *ypmc;
67
68 static bool_t ypmatch_add(const char *, const char *, int, char *, int);
69 static bool_t ypmatch_find(const char *, const char *, int, const char **,
70 int *);
71
72 static bool_t
ypmatch_add(const char * map,const char * key,int keylen,char * val,int vallen)73 ypmatch_add(const char *map, const char *key, int keylen, char *val, int vallen)
74 {
75 struct ypmatch_ent *ep;
76 time_t t;
77
78 _DIAGASSERT(map != NULL);
79 _DIAGASSERT(key != NULL);
80 _DIAGASSERT(val != NULL);
81
82 (void)time(&t);
83
84 for (ep = ypmc; ep; ep = ep->next)
85 if (ep->expire_t < t)
86 break;
87 if (ep == NULL) {
88 if ((ep = malloc(sizeof *ep)) == NULL)
89 return 0;
90 (void)memset(ep, 0, sizeof *ep);
91 if (ypmc)
92 ep->next = ypmc;
93 ypmc = ep;
94 }
95
96 if (ep->key) {
97 free(ep->key);
98 ep->key = NULL;
99 }
100 if (ep->val) {
101 free(ep->val);
102 ep->val = NULL;
103 }
104
105 if ((ep->key = malloc((size_t)keylen)) == NULL)
106 return 0;
107
108 if ((ep->val = malloc((size_t)vallen)) == NULL) {
109 free(ep->key);
110 ep->key = NULL;
111 return 0;
112 }
113
114 ep->keylen = keylen;
115 ep->vallen = vallen;
116
117 (void)memcpy(ep->key, key, (size_t)ep->keylen);
118 (void)memcpy(ep->val, val, (size_t)ep->vallen);
119
120 if (ep->map) {
121 if (strcmp(ep->map, map)) {
122 free(ep->map);
123 if ((ep->map = strdup(map)) == NULL)
124 return 0;
125 }
126 } else {
127 if ((ep->map = strdup(map)) == NULL)
128 return 0;
129 }
130
131 ep->expire_t = t + _yplib_cache;
132 return 1;
133 }
134
135 static bool_t
ypmatch_find(const char * map,const char * key,int keylen,const char ** val,int * vallen)136 ypmatch_find(const char *map, const char *key, int keylen, const char **val,
137 int *vallen)
138 {
139 struct ypmatch_ent *ep;
140 time_t t;
141
142 _DIAGASSERT(map != NULL);
143 _DIAGASSERT(key != NULL);
144 _DIAGASSERT(val != NULL);
145
146 if (ypmc == NULL)
147 return 0;
148
149 (void) time(&t);
150
151 for (ep = ypmc; ep; ep = ep->next) {
152 if (ep->keylen != keylen)
153 continue;
154 if (strcmp(ep->map, map))
155 continue;
156 if (memcmp(ep->key, key, (size_t)keylen))
157 continue;
158 if (t > ep->expire_t)
159 continue;
160
161 *val = ep->val;
162 *vallen = ep->vallen;
163 return 1;
164 }
165 return 0;
166 }
167 #endif
168
169 int
yp_match(const char * indomain,const char * inmap,const char * inkey,int inkeylen,char ** outval,int * outvallen)170 yp_match(const char *indomain, const char *inmap, const char *inkey,
171 int inkeylen, char **outval, int *outvallen)
172 {
173 struct dom_binding *ysd;
174 struct ypresp_val yprv;
175 struct ypreq_key yprk;
176 int r, nerrs = 0;
177
178 if (outval == NULL || outvallen == NULL)
179 return YPERR_BADARGS;
180 *outval = NULL;
181 *outvallen = 0;
182
183 if (_yp_invalid_domain(indomain))
184 return YPERR_BADARGS;
185 if (inmap == NULL || *inmap == '\0'
186 || strlen(inmap) > YPMAXMAP)
187 return YPERR_BADARGS;
188 if (inkey == NULL || inkeylen == 0)
189 return YPERR_BADARGS;
190
191 again:
192 if (_yp_dobind(indomain, &ysd) != 0)
193 return YPERR_DOMAIN;
194
195 #ifdef YPMATCHCACHE
196 if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
197 inkeylen, &yprv.valdat.dptr, &yprv.valdat.dsize)) {
198 *outvallen = yprv.valdat.dsize;
199 if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
200 return YPERR_YPERR;
201 (void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
202 (*outval)[*outvallen] = '\0';
203 return 0;
204 }
205 #endif
206
207 yprk.domain = indomain;
208 yprk.map = inmap;
209 yprk.keydat.dptr = __UNCONST(inkey);
210 yprk.keydat.dsize = inkeylen;
211
212 memset(&yprv, 0, sizeof yprv);
213
214 r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MATCH,
215 (xdrproc_t)xdr_ypreq_key, &yprk,
216 (xdrproc_t)xdr_ypresp_val, &yprv,
217 _yplib_timeout);
218 if (r != RPC_SUCCESS) {
219 if (_yplib_bindtries <= 0 && ++nerrs == _yplib_nerrs) {
220 clnt_perror(ysd->dom_client, "yp_match: clnt_call");
221 nerrs = 0;
222 }
223 else if (_yplib_bindtries > 0 && ++nerrs == _yplib_bindtries) {
224 return YPERR_YPSERV;
225 }
226 ysd->dom_vers = -1;
227 goto again;
228 }
229 if (!(r = ypprot_err(yprv.status))) {
230 *outvallen = yprv.valdat.dsize;
231 if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
232 return YPERR_YPERR;
233 (void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
234 (*outval)[*outvallen] = '\0';
235 #ifdef YPMATCHCACHE
236 if (strcmp(_yp_domain, indomain) == 0)
237 if (!ypmatch_add(inmap, inkey, inkeylen,
238 *outval, *outvallen))
239 r = YPERR_RESRC;
240 #endif
241 }
242 xdr_free((xdrproc_t)xdr_ypresp_val, (char *)(void *)&yprv);
243 __yp_unbind(ysd);
244 if (r != 0) {
245 if (*outval) {
246 free(*outval);
247 *outval = NULL;
248 }
249 }
250 return r;
251 }
252