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 (at) 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 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 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 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
Indexes created Tue Sep 23 02:09:52 GMT 2025