external/bsd/bind/dist/bin/named/lwdgrbn.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004-2007, 2009  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001, 2003  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: lwdgrbn.c,v 1.22 2009/09/02 23:48:01 tbox Exp */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <isc/mem.h>
  27 #include <isc/socket.h>
  28 #include <isc/string.h>         /* Required for HP/UX (and others?) */
  29 #include <isc/util.h>
  30
  31 #include <dns/db.h>
  32 #include <dns/lookup.h>
  33 #include <dns/rdata.h>
  34 #include <dns/rdataset.h>
  35 #include <dns/rdatasetiter.h>
  36 #include <dns/result.h>
  37 #include <dns/view.h>
  38
  39 #include <named/types.h>
  40 #include <named/lwdclient.h>
  41 #include <named/lwresd.h>
  42 #include <named/lwsearch.h>
  43
  44 static void start_lookup(ns_lwdclient_t *);
  45
  46 static isc_result_t
  47 fill_array(int *pos, dns_rdataset_t *rdataset,
  48            int size, unsigned char **rdatas, lwres_uint16_t *rdatalen)
  49 {
  50         dns_rdata_t rdata;
  51         isc_result_t result;
  52         isc_region_t r;
  53
  54         UNUSED(size);
  55
  56         dns_rdata_init(&rdata);
  57         for (result = dns_rdataset_first(rdataset);
  58              result == ISC_R_SUCCESS;
  59              result = dns_rdataset_next(rdataset))
  60         {
  61                 INSIST(*pos < size);
  62                 dns_rdataset_current(rdataset, &rdata);
  63                 dns_rdata_toregion(&rdata, &r);
  64                 rdatas[*pos] = r.base;
  65                 rdatalen[*pos] = r.length;
  66                 dns_rdata_reset(&rdata);
  67                 (*pos)++;
  68         }
  69         if (result == ISC_R_NOMORE)
  70                 result = ISC_R_SUCCESS;
  71         return (result);
  72 }
  73
  74 static isc_result_t
  75 iterate_node(lwres_grbnresponse_t *grbn, dns_db_t *db, dns_dbnode_t *node,
  76              isc_mem_t *mctx)
  77 {
  78         int used = 0, count;
  79         int size = 8, oldsize = 0;
  80         unsigned char **rdatas = NULL, **oldrdatas = NULL, **newrdatas = NULL;
  81         lwres_uint16_t *lens = NULL, *oldlens = NULL, *newlens = NULL;
  82         dns_rdatasetiter_t *iter = NULL;
  83         dns_rdataset_t set;
  84         dns_ttl_t ttl = ISC_INT32_MAX;
  85         lwres_uint32_t flags = LWRDATA_VALIDATED;
  86         isc_result_t result = ISC_R_NOMEMORY;
  87
  88         result = dns_db_allrdatasets(db, node, NULL, 0, &iter);
  89         if (result != ISC_R_SUCCESS)
  90                 goto out;
  91
  92         rdatas = isc_mem_get(mctx, size * sizeof(*rdatas));
  93         if (rdatas == NULL)
  94                 goto out;
  95         lens = isc_mem_get(mctx, size * sizeof(*lens));
  96         if (lens == NULL)
  97                 goto out;
  98
  99         for (result = dns_rdatasetiter_first(iter);
 100              result == ISC_R_SUCCESS;
 101              result = dns_rdatasetiter_next(iter))
 102         {
 103                 result = ISC_R_NOMEMORY;
 104                 dns_rdataset_init(&set);
 105                 dns_rdatasetiter_current(iter, &set);
 106
 107                 if (set.type != dns_rdatatype_rrsig) {
 108                         dns_rdataset_disassociate(&set);
 109                         continue;
 110                 }
 111
 112                 count = dns_rdataset_count(&set);
 113                 if (used + count > size) {
 114                         /* copy & reallocate */
 115                         oldsize = size;
 116                         oldrdatas = rdatas;
 117                         oldlens = lens;
 118                         rdatas = NULL;
 119                         lens = NULL;
 120
 121                         size *= 2;
 122
 123                         rdatas = isc_mem_get(mctx, size * sizeof(*rdatas));
 124                         if (rdatas == NULL)
 125                                 goto out;
 126                         lens = isc_mem_get(mctx, size * sizeof(*lens));
 127                         if (lens == NULL)
 128                                 goto out;
 129                         memcpy(rdatas, oldrdatas, used * sizeof(*rdatas));
 130                         memcpy(lens, oldlens, used * sizeof(*lens));
 131                         isc_mem_put(mctx, oldrdatas,
 132                                     oldsize * sizeof(*oldrdatas));
 133                         isc_mem_put(mctx, oldlens, oldsize * sizeof(*oldlens));
 134                         oldrdatas = NULL;
 135                         oldlens = NULL;
 136                 }
 137                 if (set.ttl < ttl)
 138                         ttl = set.ttl;
 139                 if (set.trust != dns_trust_secure)
 140                         flags &= (~LWRDATA_VALIDATED);
 141                 result = fill_array(&used, &set, size, rdatas, lens);
 142                 dns_rdataset_disassociate(&set);
 143                 if (result != ISC_R_SUCCESS)
 144                         goto out;
 145         }
 146         if (result == ISC_R_NOMORE)
 147                 result = ISC_R_SUCCESS;
 148         if (result != ISC_R_SUCCESS)
 149                 goto out;
 150         dns_rdatasetiter_destroy(&iter);
 151
 152         /*
 153          * If necessary, shrink and copy the arrays.
 154          */
 155         if (size != used) {
 156                 result = ISC_R_NOMEMORY;
 157                 newrdatas = isc_mem_get(mctx, used * sizeof(*rdatas));
 158                 if (newrdatas == NULL)
 159                         goto out;
 160                 newlens = isc_mem_get(mctx, used * sizeof(*lens));
 161                 if (newlens == NULL)
 162                         goto out;
 163                 memcpy(newrdatas, rdatas, used * sizeof(*rdatas));
 164                 memcpy(newlens, lens, used * sizeof(*lens));
 165                 isc_mem_put(mctx, rdatas, size * sizeof(*rdatas));
 166                 isc_mem_put(mctx, lens, size * sizeof(*lens));
 167                 grbn->rdatas = newrdatas;
 168                 grbn->rdatalen = newlens;
 169         } else {
 170                 grbn->rdatas = rdatas;
 171                 grbn->rdatalen = lens;
 172         }
 173         grbn->nrdatas = used;
 174         grbn->ttl = ttl;
 175         grbn->flags = flags;
 176         return (ISC_R_SUCCESS);
 177
 178  out:
 179         dns_rdatasetiter_destroy(&iter);
 180         if (rdatas != NULL)
 181                 isc_mem_put(mctx, rdatas, size * sizeof(*rdatas));
 182         if (lens != NULL)
 183                 isc_mem_put(mctx, lens, size * sizeof(*lens));
 184         if (oldrdatas != NULL)
 185                 isc_mem_put(mctx, oldrdatas, oldsize * sizeof(*oldrdatas));
 186         if (oldlens != NULL)
 187                 isc_mem_put(mctx, oldlens, oldsize * sizeof(*oldlens));
 188         if (newrdatas != NULL)
 189                 isc_mem_put(mctx, newrdatas, used * sizeof(*oldrdatas));
 190         return (result);
 191 }
 192
 193 static void
 194 lookup_done(isc_task_t *task, isc_event_t *event) {
 195         ns_lwdclient_t *client;
 196         ns_lwdclientmgr_t *cm;
 197         dns_lookupevent_t *levent;
 198         lwres_buffer_t lwb;
 199         dns_name_t *name;
 200         dns_rdataset_t *rdataset;
 201         dns_rdataset_t *sigrdataset;
 202         isc_result_t result;
 203         lwres_result_t lwresult;
 204         isc_region_t r;
 205         isc_buffer_t b;
 206         lwres_grbnresponse_t *grbn;
 207         int i;
 208
 209         UNUSED(task);
 210
 211         lwb.base = NULL;
 212         client = event->ev_arg;
 213         cm = client->clientmgr;
 214         INSIST(client->lookup == (dns_lookup_t *)event->ev_sender);
 215
 216         levent = (dns_lookupevent_t *)event;
 217         grbn = &client->grbn;
 218
 219         ns_lwdclient_log(50, "lookup event result = %s",
 220                          isc_result_totext(levent->result));
 221
 222         result = levent->result;
 223         if (result != ISC_R_SUCCESS) {
 224                 dns_lookup_destroy(&client->lookup);
 225                 isc_event_free(&event);
 226                 levent = NULL;
 227
 228                 switch (result) {
 229                 case DNS_R_NXDOMAIN:
 230                 case DNS_R_NCACHENXDOMAIN:
 231                         result = ns_lwsearchctx_next(&client->searchctx);
 232                         if (result != ISC_R_SUCCESS)
 233                                 lwresult = LWRES_R_NOTFOUND;
 234                         else {
 235                                 start_lookup(client);
 236                                 return;
 237                         }
 238                         break;
 239                 case DNS_R_NXRRSET:
 240                 case DNS_R_NCACHENXRRSET:
 241                         lwresult = LWRES_R_TYPENOTFOUND;
 242                         break;
 243                 default:
 244                         lwresult = LWRES_R_FAILURE;
 245                 }
 246                 ns_lwdclient_errorpktsend(client, lwresult);
 247                 return;
 248         }
 249
 250         name = levent->name;
 251         b = client->recv_buffer;
 252
 253         grbn->flags = 0;
 254
 255         grbn->nrdatas = 0;
 256         grbn->rdatas = NULL;
 257         grbn->rdatalen = NULL;
 258
 259         grbn->nsigs = 0;
 260         grbn->sigs = NULL;
 261         grbn->siglen = NULL;
 262
 263         result = dns_name_totext(name, ISC_TRUE, &client->recv_buffer);
 264         if (result != ISC_R_SUCCESS)
 265                 goto out;
 266         grbn->realname = (char *)isc_buffer_used(&b);
 267         grbn->realnamelen = isc_buffer_usedlength(&client->recv_buffer) -
 268                             isc_buffer_usedlength(&b);
 269         ns_lwdclient_log(50, "found name '%.*s'", grbn->realnamelen,
 270                          grbn->realname);
 271
 272         grbn->rdclass = cm->view->rdclass;
 273         grbn->rdtype = client->rdtype;
 274
 275         rdataset = levent->rdataset;
 276         if (rdataset != NULL) {
 277                 /* The normal case */
 278                 grbn->nrdatas = dns_rdataset_count(rdataset);
 279                 grbn->rdatas = isc_mem_get(cm->mctx, grbn->nrdatas *
 280                                            sizeof(unsigned char *));
 281                 if (grbn->rdatas == NULL)
 282                         goto out;
 283                 grbn->rdatalen = isc_mem_get(cm->mctx, grbn->nrdatas *
 284                                              sizeof(lwres_uint16_t));
 285                 if (grbn->rdatalen == NULL)
 286                         goto out;
 287
 288                 i = 0;
 289                 result = fill_array(&i, rdataset, grbn->nrdatas, grbn->rdatas,
 290                                     grbn->rdatalen);
 291                 if (result != ISC_R_SUCCESS)
 292                         goto out;
 293                 INSIST(i == grbn->nrdatas);
 294                 grbn->ttl = rdataset->ttl;
 295                 if (rdataset->trust == dns_trust_secure)
 296                         grbn->flags |= LWRDATA_VALIDATED;
 297         } else {
 298                 /* The SIG query case */
 299                 result = iterate_node(grbn, levent->db, levent->node,
 300                                       cm->mctx);
 301                 if (result != ISC_R_SUCCESS)
 302                         goto out;
 303         }
 304         ns_lwdclient_log(50, "filled in %d rdata%s", grbn->nrdatas,
 305                          (grbn->nrdatas == 1) ? "" : "s");
 306
 307         sigrdataset = levent->sigrdataset;
 308         if (sigrdataset != NULL) {
 309                 grbn->nsigs = dns_rdataset_count(sigrdataset);
 310                 grbn->sigs = isc_mem_get(cm->mctx, grbn->nsigs *
 311                                          sizeof(unsigned char *));
 312                 if (grbn->sigs == NULL)
 313                         goto out;
 314                 grbn->siglen = isc_mem_get(cm->mctx, grbn->nsigs *
 315                                            sizeof(lwres_uint16_t));
 316                 if (grbn->siglen == NULL)
 317                         goto out;
 318
 319                 i = 0;
 320                 result = fill_array(&i, sigrdataset, grbn->nsigs, grbn->sigs,
 321                                     grbn->siglen);
 322                 if (result != ISC_R_SUCCESS)
 323                         goto out;
 324                 INSIST(i == grbn->nsigs);
 325                 ns_lwdclient_log(50, "filled in %d signature%s", grbn->nsigs,
 326                                  (grbn->nsigs == 1) ? "" : "s");
 327         }
 328
 329         dns_lookup_destroy(&client->lookup);
 330         isc_event_free(&event);
 331
 332         /*
 333          * Render the packet.
 334          */
 335         client->pkt.recvlength = LWRES_RECVLENGTH;
 336         client->pkt.authtype = 0; /* XXXMLG */
 337         client->pkt.authlength = 0;
 338         client->pkt.result = LWRES_R_SUCCESS;
 339
 340         lwresult = lwres_grbnresponse_render(cm->lwctx,
 341                                              grbn, &client->pkt, &lwb);
 342         if (lwresult != LWRES_R_SUCCESS)
 343                 goto out;
 344
 345         isc_mem_put(cm->mctx, grbn->rdatas,
 346                     grbn->nrdatas * sizeof(unsigned char *));
 347         isc_mem_put(cm->mctx, grbn->rdatalen,
 348                     grbn->nrdatas * sizeof(lwres_uint16_t));
 349
 350         if (grbn->sigs != NULL)
 351                 isc_mem_put(cm->mctx, grbn->sigs,
 352                             grbn->nsigs * sizeof(unsigned char *));
 353         if (grbn->siglen != NULL)
 354                 isc_mem_put(cm->mctx, grbn->siglen,
 355                             grbn->nsigs * sizeof(lwres_uint16_t));
 356
 357         r.base = lwb.base;
 358         r.length = lwb.used;
 359         client->sendbuf = r.base;
 360         client->sendlength = r.length;
 361         result = ns_lwdclient_sendreply(client, &r);
 362         if (result != ISC_R_SUCCESS)
 363                 goto out2;
 364
 365         NS_LWDCLIENT_SETSEND(client);
 366
 367         return;
 368
 369  out:
 370         if (grbn->rdatas != NULL)
 371                 isc_mem_put(cm->mctx, grbn->rdatas,
 372                             grbn->nrdatas * sizeof(unsigned char *));
 373         if (grbn->rdatalen != NULL)
 374                 isc_mem_put(cm->mctx, grbn->rdatalen,
 375                             grbn->nrdatas * sizeof(lwres_uint16_t));
 376
 377         if (grbn->sigs != NULL)
 378                 isc_mem_put(cm->mctx, grbn->sigs,
 379                             grbn->nsigs * sizeof(unsigned char *));
 380         if (grbn->siglen != NULL)
 381                 isc_mem_put(cm->mctx, grbn->siglen,
 382                             grbn->nsigs * sizeof(lwres_uint16_t));
 383  out2:
 384         if (client->lookup != NULL)
 385                 dns_lookup_destroy(&client->lookup);
 386         if (lwb.base != NULL)
 387                 lwres_context_freemem(cm->lwctx, lwb.base, lwb.length);
 388
 389         if (event != NULL)
 390                 isc_event_free(&event);
 391
 392         ns_lwdclient_log(50, "error constructing getrrsetbyname response");
 393         ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
 394 }
 395
 396 static void
 397 start_lookup(ns_lwdclient_t *client) {
 398         isc_result_t result;
 399         ns_lwdclientmgr_t *cm;
 400         dns_fixedname_t absname;
 401
 402         cm = client->clientmgr;
 403
 404         INSIST(client->lookup == NULL);
 405
 406         dns_fixedname_init(&absname);
 407         result = ns_lwsearchctx_current(&client->searchctx,
 408                                         dns_fixedname_name(&absname));
 409         /*
 410          * This will return failure if relative name + suffix is too long.
 411          * In this case, just go on to the next entry in the search path.
 412          */
 413         if (result != ISC_R_SUCCESS)
 414                 start_lookup(client);
 415
 416         result = dns_lookup_create(cm->mctx,
 417                                    dns_fixedname_name(&absname),
 418                                    client->rdtype, cm->view,
 419                                    client->options, cm->task, lookup_done,
 420                                    client, &client->lookup);
 421         if (result != ISC_R_SUCCESS) {
 422                 ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
 423                 return;
 424         }
 425 }
 426
 427 static void
 428 init_grbn(ns_lwdclient_t *client) {
 429         client->grbn.rdclass = 0;
 430         client->grbn.rdtype = 0;
 431         client->grbn.ttl = 0;
 432         client->grbn.nrdatas = 0;
 433         client->grbn.realname = NULL;
 434         client->grbn.realnamelen = 0;
 435         client->grbn.rdatas = 0;
 436         client->grbn.rdatalen = 0;
 437         client->grbn.base = NULL;
 438         client->grbn.baselen = 0;
 439         isc_buffer_init(&client->recv_buffer, client->buffer, LWRES_RECVLENGTH);
 440 }
 441
 442 void
 443 ns_lwdclient_processgrbn(ns_lwdclient_t *client, lwres_buffer_t *b) {
 444         lwres_grbnrequest_t *req;
 445         isc_result_t result;
 446         ns_lwdclientmgr_t *cm;
 447         isc_buffer_t namebuf;
 448
 449         REQUIRE(NS_LWDCLIENT_ISRECVDONE(client));
 450         INSIST(client->byaddr == NULL);
 451
 452         cm = client->clientmgr;
 453         req = NULL;
 454
 455         result = lwres_grbnrequest_parse(cm->lwctx,
 456                                          b, &client->pkt, &req);
 457         if (result != LWRES_R_SUCCESS)
 458                 goto out;
 459         if (req->name == NULL)
 460                 goto out;
 461
 462         client->options = 0;
 463         if (req->rdclass != cm->view->rdclass)
 464                 goto out;
 465
 466         if (req->rdclass == dns_rdataclass_any ||
 467             req->rdtype == dns_rdatatype_any)
 468                 goto out;
 469
 470         client->rdtype = req->rdtype;
 471
 472         isc_buffer_init(&namebuf, req->name, req->namelen);
 473         isc_buffer_add(&namebuf, req->namelen);
 474
 475         dns_fixedname_init(&client->query_name);
 476         result = dns_name_fromtext(dns_fixedname_name(&client->query_name),
 477                                    &namebuf, NULL, 0, NULL);
 478         if (result != ISC_R_SUCCESS)
 479                 goto out;
 480         ns_lwsearchctx_init(&client->searchctx,
 481                             cm->listener->manager->search,
 482                             dns_fixedname_name(&client->query_name),
 483                             cm->listener->manager->ndots);
 484         ns_lwsearchctx_first(&client->searchctx);
 485
 486         ns_lwdclient_log(50, "client %p looking for type %d",
 487                          client, client->rdtype);
 488
 489         /*
 490          * We no longer need to keep this around.
 491          */
 492         lwres_grbnrequest_free(cm->lwctx, &req);
 493
 494         /*
 495          * Initialize the real name and alias arrays in the reply we're
 496          * going to build up.
 497          */
 498         init_grbn(client);
 499
 500         /*
 501          * Start the find.
 502          */
 503         start_lookup(client);
 504
 505         return;
 506
 507         /*
 508          * We're screwed.  Return an error packet to our caller.
 509          */
 510  out:
 511         if (req != NULL)
 512                 lwres_grbnrequest_free(cm->lwctx, &req);
 513
 514         ns_lwdclient_errorpktsend(client, LWRES_R_FAILURE);
 515 }