contrib/bind9/lib/dns/rdatalist.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007, 2008, 2010  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: rdatalist.c,v 1.36.336.2 2010/02/25 10:57:12 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <stddef.h>
  25
  26 #include <isc/util.h>
  27
  28 #include <dns/name.h>
  29 #include <dns/nsec3.h>
  30 #include <dns/rdata.h>
  31 #include <dns/rdatalist.h>
  32 #include <dns/rdataset.h>
  33
  34 #include "rdatalist_p.h"
  35
  36 static dns_rdatasetmethods_t methods = {
  37         isc__rdatalist_disassociate,
  38         isc__rdatalist_first,
  39         isc__rdatalist_next,
  40         isc__rdatalist_current,
  41         isc__rdatalist_clone,
  42         isc__rdatalist_count,
  43         isc__rdatalist_addnoqname,
  44         isc__rdatalist_getnoqname,
  45         isc__rdatalist_addclosest,
  46         isc__rdatalist_getclosest,
  47         NULL,
  48         NULL,
  49         NULL,
  50         NULL,
  51         NULL
  52 };
  53
  54 void
  55 dns_rdatalist_init(dns_rdatalist_t *rdatalist) {
  56
  57         /*
  58          * Initialize rdatalist.
  59          */
  60
  61         rdatalist->rdclass = 0;
  62         rdatalist->type = 0;
  63         rdatalist->covers = 0;
  64         rdatalist->ttl = 0;
  65         ISC_LIST_INIT(rdatalist->rdata);
  66         ISC_LINK_INIT(rdatalist, link);
  67 }
  68
  69 isc_result_t
  70 dns_rdatalist_tordataset(dns_rdatalist_t *rdatalist,
  71                          dns_rdataset_t *rdataset)
  72 {
  73         /*
  74          * Make 'rdataset' refer to the rdata in 'rdatalist'.
  75          */
  76
  77         REQUIRE(rdatalist != NULL);
  78         REQUIRE(DNS_RDATASET_VALID(rdataset));
  79         REQUIRE(! dns_rdataset_isassociated(rdataset));
  80
  81         rdataset->methods = &methods;
  82         rdataset->rdclass = rdatalist->rdclass;
  83         rdataset->type = rdatalist->type;
  84         rdataset->covers = rdatalist->covers;
  85         rdataset->ttl = rdatalist->ttl;
  86         rdataset->trust = 0;
  87         rdataset->private1 = rdatalist;
  88         rdataset->private2 = NULL;
  89         rdataset->private3 = NULL;
  90         rdataset->privateuint4 = 0;
  91         rdataset->private5 = NULL;
  92
  93         return (ISC_R_SUCCESS);
  94 }
  95
  96 isc_result_t
  97 dns_rdatalist_fromrdataset(dns_rdataset_t *rdataset,
  98                            dns_rdatalist_t **rdatalist)
  99 {
 100         REQUIRE(rdatalist != NULL && rdataset != NULL);
 101         *rdatalist = rdataset->private1;
 102
 103         return (ISC_R_SUCCESS);
 104 }
 105
 106 void
 107 isc__rdatalist_disassociate(dns_rdataset_t *rdataset) {
 108         UNUSED(rdataset);
 109 }
 110
 111 isc_result_t
 112 isc__rdatalist_first(dns_rdataset_t *rdataset) {
 113         dns_rdatalist_t *rdatalist;
 114
 115         rdatalist = rdataset->private1;
 116         rdataset->private2 = ISC_LIST_HEAD(rdatalist->rdata);
 117
 118         if (rdataset->private2 == NULL)
 119                 return (ISC_R_NOMORE);
 120
 121         return (ISC_R_SUCCESS);
 122 }
 123
 124 isc_result_t
 125 isc__rdatalist_next(dns_rdataset_t *rdataset) {
 126         dns_rdata_t *rdata;
 127
 128         rdata = rdataset->private2;
 129         if (rdata == NULL)
 130                 return (ISC_R_NOMORE);
 131
 132         rdataset->private2 = ISC_LIST_NEXT(rdata, link);
 133
 134         if (rdataset->private2 == NULL)
 135                 return (ISC_R_NOMORE);
 136
 137         return (ISC_R_SUCCESS);
 138 }
 139
 140 void
 141 isc__rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
 142         dns_rdata_t *list_rdata;
 143
 144         list_rdata = rdataset->private2;
 145         INSIST(list_rdata != NULL);
 146
 147         dns_rdata_clone(list_rdata, rdata);
 148 }
 149
 150 void
 151 isc__rdatalist_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
 152         *target = *source;
 153
 154         /*
 155          * Reset iterator state.
 156          */
 157         target->private2 = NULL;
 158 }
 159
 160 unsigned int
 161 isc__rdatalist_count(dns_rdataset_t *rdataset) {
 162         dns_rdatalist_t *rdatalist;
 163         dns_rdata_t *rdata;
 164         unsigned int count;
 165
 166         rdatalist = rdataset->private1;
 167
 168         count = 0;
 169         for (rdata = ISC_LIST_HEAD(rdatalist->rdata);
 170              rdata != NULL;
 171              rdata = ISC_LIST_NEXT(rdata, link))
 172                 count++;
 173
 174         return (count);
 175 }
 176
 177 isc_result_t
 178 isc__rdatalist_addnoqname(dns_rdataset_t *rdataset, dns_name_t *name) {
 179         dns_rdataset_t *neg = NULL;
 180         dns_rdataset_t *negsig = NULL;
 181         dns_rdataset_t *rdset;
 182         dns_ttl_t ttl;
 183
 184         for (rdset = ISC_LIST_HEAD(name->list);
 185              rdset != NULL;
 186              rdset = ISC_LIST_NEXT(rdset, link))
 187         {
 188                 if (rdset->rdclass != rdataset->rdclass)
 189                         continue;
 190                 if (rdset->type == dns_rdatatype_nsec ||
 191                     rdset->type == dns_rdatatype_nsec3)
 192                         neg = rdset;
 193         }
 194         if (neg == NULL)
 195                 return (ISC_R_NOTFOUND);
 196
 197         for (rdset = ISC_LIST_HEAD(name->list);
 198              rdset != NULL;
 199              rdset = ISC_LIST_NEXT(rdset, link))
 200         {
 201                 if (rdset->type == dns_rdatatype_rrsig &&
 202                     rdset->covers == neg->type)
 203                         negsig = rdset;
 204         }
 205
 206         if (negsig == NULL)
 207                 return (ISC_R_NOTFOUND);
 208         /*
 209          * Minimise ttl.
 210          */
 211         ttl = rdataset->ttl;
 212         if (neg->ttl < ttl)
 213                 ttl = neg->ttl;
 214         if (negsig->ttl < ttl)
 215                 ttl = negsig->ttl;
 216         rdataset->ttl = neg->ttl = negsig->ttl = ttl;
 217         rdataset->attributes |= DNS_RDATASETATTR_NOQNAME;
 218         rdataset->private6 = name;
 219         return (ISC_R_SUCCESS);
 220 }
 221
 222 isc_result_t
 223 isc__rdatalist_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
 224                           dns_rdataset_t *neg, dns_rdataset_t *negsig)
 225 {
 226         dns_rdataclass_t rdclass = rdataset->rdclass;
 227         dns_rdataset_t *tneg = NULL;
 228         dns_rdataset_t *tnegsig = NULL;
 229         dns_name_t *noqname = rdataset->private6;
 230
 231         REQUIRE((rdataset->attributes & DNS_RDATASETATTR_NOQNAME) != 0);
 232         (void)dns_name_dynamic(noqname);        /* Sanity Check. */
 233
 234         for (rdataset = ISC_LIST_HEAD(noqname->list);
 235              rdataset != NULL;
 236              rdataset = ISC_LIST_NEXT(rdataset, link))
 237         {
 238                 if (rdataset->rdclass != rdclass)
 239                         continue;
 240                 if (rdataset->type == dns_rdatatype_nsec ||
 241                     rdataset->type == dns_rdatatype_nsec3)
 242                         tneg = rdataset;
 243         }
 244         if (tneg == NULL)
 245                 return (ISC_R_NOTFOUND);
 246
 247         for (rdataset = ISC_LIST_HEAD(noqname->list);
 248              rdataset != NULL;
 249              rdataset = ISC_LIST_NEXT(rdataset, link))
 250         {
 251                 if (rdataset->type == dns_rdatatype_rrsig &&
 252                     rdataset->covers == tneg->type)
 253                         tnegsig = rdataset;
 254         }
 255         if (tnegsig == NULL)
 256                 return (ISC_R_NOTFOUND);
 257
 258         dns_name_clone(noqname, name);
 259         dns_rdataset_clone(tneg, neg);
 260         dns_rdataset_clone(tnegsig, negsig);
 261         return (ISC_R_SUCCESS);
 262 }
 263
 264 isc_result_t
 265 isc__rdatalist_addclosest(dns_rdataset_t *rdataset, dns_name_t *name) {
 266         dns_rdataset_t *neg = NULL;
 267         dns_rdataset_t *negsig = NULL;
 268         dns_rdataset_t *rdset;
 269         dns_ttl_t ttl;
 270
 271         for (rdset = ISC_LIST_HEAD(name->list);
 272              rdset != NULL;
 273              rdset = ISC_LIST_NEXT(rdset, link))
 274         {
 275                 if (rdset->rdclass != rdataset->rdclass)
 276                         continue;
 277                 if (rdset->type == dns_rdatatype_nsec ||
 278                     rdset->type == dns_rdatatype_nsec3)
 279                         neg = rdset;
 280         }
 281         if (neg == NULL)
 282                 return (ISC_R_NOTFOUND);
 283
 284         for (rdset = ISC_LIST_HEAD(name->list);
 285              rdset != NULL;
 286              rdset = ISC_LIST_NEXT(rdset, link))
 287         {
 288                 if (rdset->type == dns_rdatatype_rrsig &&
 289                     rdset->covers == neg->type)
 290                         negsig = rdset;
 291         }
 292
 293         if (negsig == NULL)
 294                 return (ISC_R_NOTFOUND);
 295         /*
 296          * Minimise ttl.
 297          */
 298         ttl = rdataset->ttl;
 299         if (neg->ttl < ttl)
 300                 ttl = neg->ttl;
 301         if (negsig->ttl < ttl)
 302                 ttl = negsig->ttl;
 303         rdataset->ttl = neg->ttl = negsig->ttl = ttl;
 304         rdataset->attributes |= DNS_RDATASETATTR_CLOSEST;
 305         rdataset->private7 = name;
 306         return (ISC_R_SUCCESS);
 307 }
 308
 309 isc_result_t
 310 isc__rdatalist_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
 311                           dns_rdataset_t *neg, dns_rdataset_t *negsig)
 312 {
 313         dns_rdataclass_t rdclass = rdataset->rdclass;
 314         dns_rdataset_t *tneg = NULL;
 315         dns_rdataset_t *tnegsig = NULL;
 316         dns_name_t *closest = rdataset->private7;
 317
 318         REQUIRE((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) != 0);
 319         (void)dns_name_dynamic(closest);        /* Sanity Check. */
 320
 321         for (rdataset = ISC_LIST_HEAD(closest->list);
 322              rdataset != NULL;
 323              rdataset = ISC_LIST_NEXT(rdataset, link))
 324         {
 325                 if (rdataset->rdclass != rdclass)
 326                         continue;
 327                 if (rdataset->type == dns_rdatatype_nsec ||
 328                     rdataset->type == dns_rdatatype_nsec3)
 329                         tneg = rdataset;
 330         }
 331         if (tneg == NULL)
 332                 return (ISC_R_NOTFOUND);
 333
 334         for (rdataset = ISC_LIST_HEAD(closest->list);
 335              rdataset != NULL;
 336              rdataset = ISC_LIST_NEXT(rdataset, link))
 337         {
 338                 if (rdataset->type == dns_rdatatype_rrsig &&
 339                     rdataset->covers == tneg->type)
 340                         tnegsig = rdataset;
 341         }
 342         if (tnegsig == NULL)
 343                 return (ISC_R_NOTFOUND);
 344
 345         dns_name_clone(closest, name);
 346         dns_rdataset_clone(tneg, neg);
 347         dns_rdataset_clone(tnegsig, negsig);
 348         return (ISC_R_SUCCESS);
 349 }