lib/libc/yp/yp_match.c

   1 /*      $NetBSD: yp_match.c,v 1.16 2003/12/10 12:06:25 agc 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 1.16 2003/12/10 12:06:25 agc 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 char _yp_domain[];
  51
  52 #ifdef __weak_alias
  53 __weak_alias(yp_match,_yp_match)
  54 #endif
  55
  56 #ifdef YPMATCHCACHE
  57 int _yplib_cache = 5;
  58
  59 static struct ypmatch_ent {
  60         struct ypmatch_ent      *next;
  61         char                    *map, *key;
  62         char                    *val;
  63         int                      keylen, vallen;
  64         time_t                   expire_t;
  65 } *ypmc;
  66
  67 static bool_t ypmatch_add __P((const char *, const char *, int, char *, int));
  68 static bool_t ypmatch_find __P((const char *, const char *, int, const char **,
  69     int *));
  70
  71 static bool_t
  72 ypmatch_add(map, key, keylen, val, vallen)
  73         const char     *map;
  74         const char     *key;
  75         int             keylen;
  76         char           *val;
  77         int             vallen;
  78 {
  79         struct ypmatch_ent *ep;
  80         time_t t;
  81
  82         _DIAGASSERT(map != NULL);
  83         _DIAGASSERT(key != NULL);
  84         _DIAGASSERT(val != NULL);
  85
  86         (void)time(&t);
  87
  88         for (ep = ypmc; ep; ep = ep->next)
  89                 if (ep->expire_t < t)
  90                         break;
  91         if (ep == NULL) {
  92                 if ((ep = malloc(sizeof *ep)) == NULL)
  93                         return 0;
  94                 (void)memset(ep, 0, sizeof *ep);
  95                 if (ypmc)
  96                         ep->next = ypmc;
  97                 ypmc = ep;
  98         }
  99
 100         if (ep->key) {
 101                 free(ep->key);
 102                 ep->key = NULL;
 103         }
 104         if (ep->val) {
 105                 free(ep->val);
 106                 ep->val = NULL;
 107         }
 108
 109         if ((ep->key = malloc((size_t)keylen)) == NULL)
 110                 return 0;
 111
 112         if ((ep->val = malloc((size_t)vallen)) == NULL) {
 113                 free(ep->key);
 114                 ep->key = NULL;
 115                 return 0;
 116         }
 117
 118         ep->keylen = keylen;
 119         ep->vallen = vallen;
 120
 121         (void)memcpy(ep->key, key, (size_t)ep->keylen);
 122         (void)memcpy(ep->val, val, (size_t)ep->vallen);
 123
 124         if (ep->map) {
 125                 if (strcmp(ep->map, map)) {
 126                         free(ep->map);
 127                         if ((ep->map = strdup(map)) == NULL)
 128                                 return 0;
 129                 }
 130         } else {
 131                 if ((ep->map = strdup(map)) == NULL)
 132                         return 0;
 133         }
 134
 135         ep->expire_t = t + _yplib_cache;
 136         return 1;
 137 }
 138
 139 static bool_t
 140 ypmatch_find(map, key, keylen, val, vallen)
 141         const char     *map;
 142         const char     *key;
 143         int             keylen;
 144         const char    **val;
 145         int            *vallen;
 146 {
 147         struct ypmatch_ent *ep;
 148         time_t          t;
 149
 150         _DIAGASSERT(map != NULL);
 151         _DIAGASSERT(key != NULL);
 152         _DIAGASSERT(val != NULL);
 153
 154         if (ypmc == NULL)
 155                 return 0;
 156
 157         (void) time(&t);
 158
 159         for (ep = ypmc; ep; ep = ep->next) {
 160                 if (ep->keylen != keylen)
 161                         continue;
 162                 if (strcmp(ep->map, map))
 163                         continue;
 164                 if (memcmp(ep->key, key, (size_t)keylen))
 165                         continue;
 166                 if (t > ep->expire_t)
 167                         continue;
 168
 169                 *val = ep->val;
 170                 *vallen = ep->vallen;
 171                 return 1;
 172         }
 173         return 0;
 174 }
 175 #endif
 176
 177 int
 178 yp_match(indomain, inmap, inkey, inkeylen, outval, outvallen)
 179         const char     *indomain;
 180         const char     *inmap;
 181         const char     *inkey;
 182         int             inkeylen;
 183         char          **outval;
 184         int            *outvallen;
 185 {
 186         struct dom_binding *ysd;
 187         struct ypresp_val yprv;
 188         struct ypreq_key yprk;
 189         int r, nerrs = 0;
 190
 191         if (outval == NULL || outvallen == NULL)
 192                 return YPERR_BADARGS;
 193         *outval = NULL;
 194         *outvallen = 0;
 195
 196         if (_yp_invalid_domain(indomain))
 197                 return YPERR_BADARGS;
 198         if (inmap == NULL || *inmap == '\0'
 199             || strlen(inmap) > YPMAXMAP)
 200                 return YPERR_BADARGS;
 201         if (inkey == NULL || inkeylen == 0)
 202                 return YPERR_BADARGS;
 203
 204 again:
 205         if (_yp_dobind(indomain, &ysd) != 0)
 206                 return YPERR_DOMAIN;
 207
 208 #ifdef YPMATCHCACHE
 209         if (!strcmp(_yp_domain, indomain) && ypmatch_find(inmap, inkey,
 210                          inkeylen, &yprv.valdat.dptr, &yprv.valdat.dsize)) {
 211                 *outvallen = yprv.valdat.dsize;
 212                 if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
 213                         return YPERR_YPERR;
 214                 (void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
 215                 (*outval)[*outvallen] = '\0';
 216                 return 0;
 217         }
 218 #endif
 219
 220         yprk.domain = indomain;
 221         yprk.map = inmap;
 222         yprk.keydat.dptr = __UNCONST(inkey);
 223         yprk.keydat.dsize = inkeylen;
 224
 225         memset(&yprv, 0, sizeof yprv);
 226
 227         r = clnt_call(ysd->dom_client, (rpcproc_t)YPPROC_MATCH,
 228                       (xdrproc_t)xdr_ypreq_key, &yprk,
 229                       (xdrproc_t)xdr_ypresp_val, &yprv,
 230                       _yplib_timeout);
 231         if (r != RPC_SUCCESS) {
 232                 if (++nerrs == _yplib_nerrs) {
 233                         clnt_perror(ysd->dom_client, "yp_match: clnt_call");
 234                         nerrs = 0;
 235                 }
 236                 ysd->dom_vers = -1;
 237                 goto again;
 238         }
 239         if (!(r = ypprot_err(yprv.status))) {
 240                 *outvallen = yprv.valdat.dsize;
 241                 if ((*outval = malloc((size_t)(*outvallen + 1))) == NULL)
 242                         return YPERR_YPERR;
 243                 (void)memcpy(*outval, yprv.valdat.dptr, (size_t)*outvallen);
 244                 (*outval)[*outvallen] = '\0';
 245 #ifdef YPMATCHCACHE
 246                 if (strcmp(_yp_domain, indomain) == 0)
 247                         if (!ypmatch_add(inmap, inkey, inkeylen,
 248                                          *outval, *outvallen))
 249                                 r = YPERR_RESRC;
 250 #endif
 251         }
 252         xdr_free((xdrproc_t)xdr_ypresp_val, (char *)(void *)&yprv);
 253         __yp_unbind(ysd);
 254         if (r != 0) {
 255                 if (*outval) {
 256                         free(*outval);
 257                         *outval = NULL;
 258                 }
 259         }
 260         return r;
 261 }