lib/libc/yp/yp_match.c

   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
  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
 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
 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 }