1 /* $NetBSD: yp_match.c,v 1.20 2024/01/03 18:41:53 christos 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 1.20 2024/01/03 18:41:53 christos 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 #ifdef __weak_alias
49 __weak_alias(yp_match,_yp_match)
50 #endif
51
52 #ifdef YPMATCHCACHE
53 int _yplib_cache = 5;
54
55 static struct ypmatch_ent {
56 struct ypmatch_ent *next;
57 char *map, *key;
58 char *val;
59 int keylen, vallen;
60 time_t expire_t;
61 } *ypmc;
62
63 static bool_t ypmatch_add(const char *, const char *, int, char *, int);
64 static bool_t ypmatch_find(const char *, const char *, int, const char **,
65 int *);
66
67 static bool_t
ypmatch_add(const char * map,const char * key,int keylen,char * val,int vallen)68 ypmatch_add(const char *map, const char *key, int keylen, char *val, int vallen)
69 {
70 struct ypmatch_ent *ep;
71 time_t t;
72
73 _DIAGASSERT(map != NULL);
74 _DIAGASSERT(key != NULL);
75 _DIAGASSERT(val != NULL);
76
77 (void)time(&t);
78
79 for (ep = ypmc; ep; ep = ep->next)
80 if (ep->expire_t < t)
81 break;
82 if (ep == NULL) {
83 if ((ep = malloc(sizeof *ep)) == NULL)
84 return 0;
85 (void)memset(ep, 0, sizeof *ep);
86 if (ypmc)
87 ep->next = ypmc;
88 ypmc = ep;
89 }
90
91 if (ep->key) {
92 free(ep->key);
93 ep->key = NULL;
94 }
95 if (ep->val) {
96 free(ep->val);
97 ep->val = NULL;
98 }
99
100 if ((ep->key = malloc((size_t)keylen)) == NULL)
101 return 0;
102
103 if ((ep->val = malloc((size_t)vallen)) == NULL) {
104 free(ep->key);
105 ep->key = NULL;
106 return 0;
107 }
108
109 ep->keylen = keylen;
110 ep->vallen = vallen;
111
112 (void)memcpy(ep->key, key, (size_t)ep->keylen);
113 (void)memcpy(ep->val, val, (size_t)ep->vallen);
114
115 if (ep->map) {
116 if (strcmp(ep->map, map)) {
117 free(ep->map);
118 if ((ep->map = strdup(map)) == NULL)
119 return 0;
120 }
121 } else {
122 if ((ep->map = strdup(map)) == NULL)
123 return 0;
124 }
125
126 ep->expire_t = t + _yplib_cache;
127 return 1;
128 }
129
130 static bool_t
ypmatch_find(const char * map,const char * key,int keylen,const char ** val,int * vallen)131 ypmatch_find(const char *map, const char *key, int keylen, const char **val,
132 int *vallen)
133 {
134 struct ypmatch_ent *ep;
135 time_t t;
136
137 _DIAGASSERT(map != NULL);
138 _DIAGASSERT(key != NULL);
139 _DIAGASSERT(val != NULL);
140
141 if (ypmc == NULL)
142 return 0;
143
144 (void) time(&t);
145
146 for (ep = ypmc; ep; ep = ep->next) {
147 if (ep->keylen != keylen)
148 continue;
149 if (strcmp(ep->map, map))
150 continue;
151 if (memcmp(ep->key, key, (size_t)keylen))
152 continue;
153 if (t > ep->expire_t)
154 continue;
155
156 *val = ep->val;
157 *vallen = ep->vallen;
158 return 1;
159 }
160 return 0;
161 }
162 #endif
163
164 int
yp_match(const char * indomain,const char * inmap,const char * inkey,int inkeylen,char ** outval,int * outvallen)165 yp_match(const char *indomain, const char *inmap, const char *inkey,
166 int inkeylen, char **outval, int *outvallen)
167 {
168 struct dom_binding *ysd;
169 struct ypresp_val yprv;
170 struct ypreq_key yprk;
171 int r, nerrs = 0;
172
173 if (outval == NULL || outvallen == NULL)
174 return YPERR_BADARGS;
175 *outval = NULL;
176 *outvallen = 0;
177
178 if (_yp_invalid_domain(indomain))
179 return YPERR_BADARGS;
180 if (inmap == NULL || *inmap == '\0'
181 || strlen(inmap) > YPMAXMAP)
182 return YPERR_BADARGS;
183 if (inkey == NULL || inkeylen == 0)
184 return YPERR_BADARGS;
185
186 again:
187 if (_yp_dobind(indomain, &ysd) != 0)
188 return YPERR_DOMAIN;
189
190 #ifdef YPMATCHCACHE
191 if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
192 inkeylen, &yprv.valdat.dptr, &yprv.valdat.dsize)) {
193 *outvallen = yprv.valdat.dsize;
194 if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
195 return YPERR_YPERR;
196 (void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
197 (*outval)[*outvallen] = '\0';
198 return 0;
199 }
200 #endif
201
202 yprk.domain = indomain;
203 yprk.map = inmap;
204 yprk.keydat.dptr = __UNCONST(inkey);
205 yprk.keydat.dsize = inkeylen;
206
207 memset(&yprv, 0, sizeof yprv);
208
209 r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MATCH,
210 (xdrproc_t)xdr_ypreq_key, &yprk,
211 (xdrproc_t)xdr_ypresp_val, &yprv,
212 _yplib_timeout);
213 if (r != RPC_SUCCESS) {
214 if (_yplib_bindtries <= 0 && ++nerrs == _yplib_nerrs) {
215 clnt_perror(ysd->dom_client, "yp_match: clnt_call");
216 nerrs = 0;
217 }
218 else if (_yplib_bindtries > 0 && ++nerrs == _yplib_bindtries) {
219 return YPERR_YPSERV;
220 }
221 ysd->dom_vers = -1;
222 goto again;
223 }
224 if (!(r = ypprot_err(yprv.status))) {
225 *outvallen = yprv.valdat.dsize;
226 if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
227 return YPERR_YPERR;
228 (void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
229 (*outval)[*outvallen] = '\0';
230 #ifdef YPMATCHCACHE
231 if (strcmp(_yp_domain, indomain) == 0)
232 if (!ypmatch_add(inmap, inkey, inkeylen,
233 *outval, *outvallen))
234 r = YPERR_RESRC;
235 #endif
236 }
237 xdr_free((xdrproc_t)xdr_ypresp_val, (char *)(void *)&yprv);
238 __yp_unbind(ysd);
239 if (r != 0) {
240 if (*outval) {
241 free(*outval);
242 *outval = NULL;
243 }
244 }
245 return r;
246 }
247