view.c 17.5 KB
Newer Older
Bob Halley's avatar
add  
Bob Halley committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
/*
 * Copyright (C) 1999  Internet Software Consortium.
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include <config.h>

#include <string.h>

#include <isc/types.h>
#include <isc/result.h>
#include <isc/mem.h>
#include <isc/assertions.h>
#include <isc/error.h>

#include <dns/types.h>
Bob Halley's avatar
add adb  
Bob Halley committed
29
#include <dns/adb.h>
30
#include <dns/cache.h>
Bob Halley's avatar
add  
Bob Halley committed
31
#include <dns/dbtable.h>
Bob Halley's avatar
Bob Halley committed
32
#include <dns/db.h>
33
#include <dns/events.h>
Bob Halley's avatar
Bob Halley committed
34
#include <dns/fixedname.h>
Bob Halley's avatar
Bob Halley committed
35
#include <dns/rbt.h>
Bob Halley's avatar
Bob Halley committed
36
#include <dns/rdataset.h>
Bob Halley's avatar
add  
Bob Halley committed
37 38 39 40 41
#include <dns/resolver.h>
#include <dns/view.h>

#include "../isc/util.h"		/* XXXRTH */

42 43 44 45 46 47
#define RESSHUTDOWN(v)	(((v)->attributes & DNS_VIEWATTR_RESSHUTDOWN) != 0)
#define ADBSHUTDOWN(v)	(((v)->attributes & DNS_VIEWATTR_ADBSHUTDOWN) != 0)

static void resolver_shutdown(isc_task_t *task, isc_event_t *event);
static void adb_shutdown(isc_task_t *task, isc_event_t *event);

Bob Halley's avatar
add  
Bob Halley committed
48
isc_result_t
49 50
dns_view_create(isc_mem_t *mctx, dns_rdataclass_t rdclass,
		const char *name, dns_view_t **viewp)
Bob Halley's avatar
add  
Bob Halley committed
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
{
	dns_view_t *view;
	isc_result_t result;

	/*
	 * Create a view.
	 */

	REQUIRE(name != NULL);
	REQUIRE(viewp != NULL && *viewp == NULL);

	view = isc_mem_get(mctx, sizeof *view);
	if (view == NULL)
		return (ISC_R_NOMEMORY);
	view->name = isc_mem_strdup(mctx, name);
	if (view->name == NULL) {
		result = ISC_R_NOMEMORY;
		goto cleanup_view;
	}
	result = isc_mutex_init(&view->lock);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "isc_mutex_init() failed: %s",
				 isc_result_totext(result));
		result = ISC_R_UNEXPECTED;
		goto cleanup_name;
	}
78 79
	view->zonetable = NULL;
	result = dns_zt_create(mctx, rdclass, &view->zonetable);
Bob Halley's avatar
add  
Bob Halley committed
80 81
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
82
				 "dns_zt_create() failed: %s",
Bob Halley's avatar
add  
Bob Halley committed
83 84 85 86
				 isc_result_totext(result));
		result = ISC_R_UNEXPECTED;
		goto cleanup_mutex;
	}
Bob Halley's avatar
Bob Halley committed
87 88 89 90 91 92 93
	view->secroots = NULL;
	result = dns_rbt_create(mctx, NULL, NULL, &view->secroots);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "dns_rbt_create() failed: %s",
				 isc_result_totext(result));
		result = ISC_R_UNEXPECTED;
94
		goto cleanup_zt;
Bob Halley's avatar
Bob Halley committed
95
	}
96

97
	view->cache = NULL;
Bob Halley's avatar
Bob Halley committed
98
	view->cachedb = NULL;
Bob Halley's avatar
Bob Halley committed
99
	view->hints = NULL;
Bob Halley's avatar
add  
Bob Halley committed
100
	view->resolver = NULL;
Bob Halley's avatar
add adb  
Bob Halley committed
101
	view->adb = NULL;
Bob Halley's avatar
add  
Bob Halley committed
102 103
	view->mctx = mctx;
	view->rdclass = rdclass;
Bob Halley's avatar
Bob Halley committed
104
	view->frozen = ISC_FALSE;
105
	view->task = NULL;
Bob Halley's avatar
add  
Bob Halley committed
106
	view->references = 1;
107
	view->attributes = (DNS_VIEWATTR_RESSHUTDOWN|DNS_VIEWATTR_ADBSHUTDOWN);
Michael Graff's avatar
Michael Graff committed
108
	ISC_LINK_INIT(view, link);
109 110 111 112 113 114
	ISC_EVENT_INIT(&view->resevent, sizeof view->resevent, 0, NULL,
		       DNS_EVENT_VIEWRESSHUTDOWN, resolver_shutdown,
		       view, NULL, NULL, NULL);
	ISC_EVENT_INIT(&view->adbevent, sizeof view->adbevent, 0, NULL,
		       DNS_EVENT_VIEWADBSHUTDOWN, adb_shutdown,
		       view, NULL, NULL, NULL);
Bob Halley's avatar
add  
Bob Halley committed
115 116 117 118 119 120
	view->magic = DNS_VIEW_MAGIC;
	
	*viewp = view;

	return (ISC_R_SUCCESS);

121 122
 cleanup_zt:
	dns_zt_detach(&view->zonetable);
Bob Halley's avatar
Bob Halley committed
123

Bob Halley's avatar
add  
Bob Halley committed
124 125 126 127 128 129 130 131 132 133 134 135 136 137
 cleanup_mutex:
	isc_mutex_destroy(&view->lock);

 cleanup_name:
	isc_mem_free(mctx, view->name);

 cleanup_view:
	isc_mem_put(mctx, view, sizeof *view);

	return (result);
}

void
dns_view_attach(dns_view_t *source, dns_view_t **targetp) {
Bob Halley's avatar
Bob Halley committed
138 139 140 141 142

	/*
	 * Attach '*targetp' to 'source'.
	 */

Bob Halley's avatar
add  
Bob Halley committed
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
	REQUIRE(DNS_VIEW_VALID(source));
	REQUIRE(targetp != NULL && *targetp == NULL);

	LOCK(&source->lock);

	INSIST(source->references > 0);
	source->references++;
	INSIST(source->references != 0);

	UNLOCK(&source->lock);

	*targetp = source;
}

static inline void
destroy(dns_view_t *view) {
	REQUIRE(!ISC_LINK_LINKED(view, link));
160 161 162
	REQUIRE(view->references == 0);
	REQUIRE(RESSHUTDOWN(view));
	REQUIRE(ADBSHUTDOWN(view));
Bob Halley's avatar
add  
Bob Halley committed
163

Bob Halley's avatar
add adb  
Bob Halley committed
164 165
	if (view->adb != NULL)
		dns_adb_detach(&view->adb);
Bob Halley's avatar
add  
Bob Halley committed
166 167
	if (view->resolver != NULL)
		dns_resolver_detach(&view->resolver);
168 169
	if (view->task != NULL)
		isc_task_detach(&view->task);
Bob Halley's avatar
Bob Halley committed
170 171
	if (view->hints != NULL)
		dns_db_detach(&view->hints);
Bob Halley's avatar
Bob Halley committed
172 173
	if (view->cachedb != NULL)
		dns_db_detach(&view->cachedb);
174 175
	if (view->cache != NULL)
		dns_cache_detach(&view->cache);
176
	dns_zt_detach(&view->zonetable);
Bob Halley's avatar
Bob Halley committed
177
	dns_rbt_destroy(&view->secroots);
Bob Halley's avatar
add  
Bob Halley committed
178 179 180 181 182
	isc_mutex_destroy(&view->lock);
	isc_mem_free(view->mctx, view->name);
	isc_mem_put(view->mctx, view, sizeof *view);
}

183 184 185 186 187 188 189 190 191 192 193 194
static isc_boolean_t
all_done(dns_view_t *view) {
	/*
	 * Caller must be holding the view lock.
	 */

	if (view->references == 0 && RESSHUTDOWN(view) && ADBSHUTDOWN(view))
		return (ISC_TRUE);

	return (ISC_FALSE);
}

Bob Halley's avatar
add  
Bob Halley committed
195 196 197
void
dns_view_detach(dns_view_t **viewp) {
	dns_view_t *view;
198
	isc_boolean_t done = ISC_FALSE;
Bob Halley's avatar
add  
Bob Halley committed
199

Bob Halley's avatar
Bob Halley committed
200 201 202 203
	/*
	 * Detach '*viewp' from its view.
	 */

Bob Halley's avatar
add  
Bob Halley committed
204 205 206 207 208 209 210 211
	REQUIRE(viewp != NULL);
	view = *viewp;
	REQUIRE(DNS_VIEW_VALID(view));

	LOCK(&view->lock);

	INSIST(view->references > 0);
	view->references--;
212 213 214 215 216 217 218
	if (view->references == 0) {
		if (!RESSHUTDOWN(view))
			dns_resolver_shutdown(view->resolver);
		if (!ADBSHUTDOWN(view))
			dns_adb_shutdown(view->adb);
		done = all_done(view);
	}
Bob Halley's avatar
add  
Bob Halley committed
219 220 221 222
	UNLOCK(&view->lock);

	*viewp = NULL;

223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
	if (done)
		destroy(view);
}

static void
resolver_shutdown(isc_task_t *task, isc_event_t *event) {
	dns_view_t *view = event->arg;
	isc_boolean_t done;
	
	REQUIRE(event->type == DNS_EVENT_VIEWRESSHUTDOWN);
	REQUIRE(DNS_VIEW_VALID(view));
	REQUIRE(view->task == task);

	LOCK(&view->lock);

	view->attributes |= DNS_VIEWATTR_RESSHUTDOWN;
	done = all_done(view);

	UNLOCK(&view->lock);

	isc_event_free(&event);

	if (done)
		destroy(view);
}

static void
adb_shutdown(isc_task_t *task, isc_event_t *event) {
	dns_view_t *view = event->arg;
	isc_boolean_t done;
	
	REQUIRE(event->type == DNS_EVENT_VIEWADBSHUTDOWN);
	REQUIRE(DNS_VIEW_VALID(view));
	REQUIRE(view->task == task);

	LOCK(&view->lock);

	view->attributes |= DNS_VIEWATTR_ADBSHUTDOWN;
	done = all_done(view);

	UNLOCK(&view->lock);

	isc_event_free(&event);

	if (done)
Bob Halley's avatar
add  
Bob Halley committed
268 269
		destroy(view);
}
270

Bob Halley's avatar
Bob Halley committed
271
isc_result_t
Bob Halley's avatar
Bob Halley committed
272 273 274 275
dns_view_createresolver(dns_view_t *view,
			isc_taskmgr_t *taskmgr, unsigned int ntasks,
			isc_socketmgr_t *socketmgr,
			isc_timermgr_t *timermgr,
Bob Halley's avatar
Bob Halley committed
276 277
			dns_dispatch_t *dispatch)
{
Bob Halley's avatar
add adb  
Bob Halley committed
278
	isc_result_t result;
279
	isc_event_t *event;
Bob Halley's avatar
add adb  
Bob Halley committed
280

Bob Halley's avatar
Bob Halley committed
281
	/*
Bob Halley's avatar
add adb  
Bob Halley committed
282
	 * Create a resolver and address database for the view.
Bob Halley's avatar
Bob Halley committed
283 284
	 */

285
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
286
	REQUIRE(!view->frozen);
287
	REQUIRE(view->resolver == NULL);
288 289 290 291 292

	result = isc_task_create(taskmgr, view->mctx, 0, &view->task);
	if (result != ISC_R_SUCCESS)
		return (result);

Bob Halley's avatar
add adb  
Bob Halley committed
293 294
	result = dns_resolver_create(view, taskmgr, ntasks, socketmgr,
				     timermgr, dispatch, &view->resolver);
295 296
	if (result != ISC_R_SUCCESS) {
		isc_task_detach(&view->task);
Bob Halley's avatar
add adb  
Bob Halley committed
297
		return (result);
298 299 300 301 302
	}
	event = &view->resevent;
	dns_resolver_whenshutdown(view->resolver, view->task, &event);
	view->attributes &= ~DNS_VIEWATTR_RESSHUTDOWN;

Bob Halley's avatar
add adb  
Bob Halley committed
303 304
	result = dns_adb_create(view->mctx, view, timermgr, taskmgr,
				&view->adb);
305 306 307 308 309 310 311
	if (result != ISC_R_SUCCESS) {
		dns_resolver_shutdown(view->resolver);
		return (result);
	}
	event = &view->adbevent;
	dns_adb_whenshutdown(view->adb, view->task, &event);
	view->attributes &= ~DNS_VIEWATTR_ADBSHUTDOWN;
Bob Halley's avatar
add adb  
Bob Halley committed
312

313
	return (ISC_R_SUCCESS);
314 315 316
}

void
317
dns_view_setcache(dns_view_t *view, dns_cache_t *cache) {
Bob Halley's avatar
Bob Halley committed
318 319

	/*
320
	 * Set the view's cache.
Bob Halley's avatar
Bob Halley committed
321 322
	 */

323
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
324
	REQUIRE(!view->frozen);
325

326
	if (view->cache != NULL) {
Bob Halley's avatar
add adb  
Bob Halley committed
327
		dns_db_detach(&view->cachedb);
328 329 330 331 332
		dns_cache_detach(&view->cache);
	}
	dns_cache_attach(cache, &view->cache);
	dns_cache_attachdb(cache, &view->cachedb);
	INSIST(DNS_DB_VALID(view->cachedb));
333 334
}

Bob Halley's avatar
Bob Halley committed
335 336 337 338 339 340 341 342 343 344 345 346 347 348 349
void
dns_view_sethints(dns_view_t *view, dns_db_t *hints) {

	/*
	 * Set the view's hints database.
	 */

	REQUIRE(DNS_VIEW_VALID(view));
	REQUIRE(!view->frozen);
	REQUIRE(view->hints == NULL);
	REQUIRE(dns_db_iszone(hints));

	dns_db_attach(hints, &view->hints);
}

350
isc_result_t
351
dns_view_addzone(dns_view_t *view, dns_zone_t *zone) {
Bob Halley's avatar
Bob Halley committed
352 353 354
	isc_result_t result;

	/*
355
	 * Add zone 'zone' to 'view'.
Bob Halley's avatar
Bob Halley committed
356 357
	 */

358
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
359 360
	REQUIRE(!view->frozen);

361
	result = dns_zt_mount(view->zonetable, zone);
362

Bob Halley's avatar
Bob Halley committed
363
	return (result);
364 365 366 367
}

void
dns_view_freeze(dns_view_t *view) {
Bob Halley's avatar
Bob Halley committed
368 369 370 371 372 373 374 375 376 377 378
	
	/*
	 * Freeze view.
	 */

	REQUIRE(DNS_VIEW_VALID(view));
	REQUIRE(!view->frozen);

	view->frozen = ISC_TRUE;
}

379
isc_result_t
380
dns_view_findzone(dns_view_t *view, dns_name_t *name, dns_zone_t **zonep) {
381 382 383 384
	isc_result_t result;

	REQUIRE(DNS_VIEW_VALID(view));

385
	result = dns_zt_find(view->zonetable, name, NULL, zonep);
386
	if (result == DNS_R_PARTIALMATCH) {
387
		dns_zone_detach(zonep);
388 389
		result = DNS_R_NOTFOUND;
	}
390

391 392 393
	return (result);
}

Bob Halley's avatar
Bob Halley committed
394 395
isc_result_t
dns_view_find(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
Bob Halley's avatar
Bob Halley committed
396
	      isc_stdtime_t now, unsigned int options, isc_boolean_t use_hints,
Bob Halley's avatar
Bob Halley committed
397 398 399 400 401 402 403 404
	      dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
{
	isc_result_t result;
	dns_fixedname_t foundname;
	dns_db_t *db;
	dns_dbversion_t *version;
	isc_boolean_t is_zone;
	dns_rdataset_t zrdataset, zsigrdataset;
405
	dns_zone_t *zone;
Bob Halley's avatar
Bob Halley committed
406 407 408 409 410 411

	/*
	 * Find an rdataset whose owner name is 'name', and whose type is
	 * 'type'.
	 */

412
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
413 414 415 416 417 418 419 420 421 422 423 424
	REQUIRE(view->frozen);
	REQUIRE(type != dns_rdatatype_any && type != dns_rdatatype_sig);

	/*
	 * Initialize.
	 */
	dns_rdataset_init(&zrdataset);
	dns_rdataset_init(&zsigrdataset);

	/*
	 * Find a database to answer the query.
	 */
425
	zone = NULL;
Bob Halley's avatar
Bob Halley committed
426
	db = NULL;
427 428 429 430 431 432 433 434
	result = dns_zt_find(view->zonetable, name, NULL, &zone);
	if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
		result = dns_zone_getdb(zone, &db);
		if (result != DNS_R_SUCCESS && view->cachedb != NULL)
			dns_db_attach(view->cachedb, &db);
		else if (result != DNS_R_SUCCESS)
			goto cleanup;
	} else if (result == ISC_R_NOTFOUND && view->cachedb != NULL)
Bob Halley's avatar
Bob Halley committed
435
		dns_db_attach(view->cachedb, &db);
436
	else
Bob Halley's avatar
Bob Halley committed
437 438 439
		goto cleanup;

	is_zone = dns_db_iszone(db);
440

Bob Halley's avatar
Bob Halley committed
441 442 443 444 445 446 447 448 449 450
 db_find:
	/*
	 * Now look for an answer in the database.
	 */
	dns_fixedname_init(&foundname);
	result = dns_db_find(db, name, NULL, type, options,
			     now, NULL, dns_fixedname_name(&foundname),
			     rdataset, sigrdataset);

	if (result == DNS_R_DELEGATION ||
Bob Halley's avatar
Bob Halley committed
451
	    result == DNS_R_NOTFOUND) {
Bob Halley's avatar
Bob Halley committed
452 453
		if (rdataset->methods != NULL)
			dns_rdataset_disassociate(rdataset);
Bob Halley's avatar
Bob Halley committed
454
		if (sigrdataset != NULL && sigrdataset->methods != NULL)
Bob Halley's avatar
Bob Halley committed
455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474
			dns_rdataset_disassociate(sigrdataset);
		if (is_zone) {
			if (view->cachedb != NULL) {
				/*
				 * Either the answer is in the cache, or we
				 * don't know it.
				 */
				is_zone = ISC_FALSE;
				version = NULL;
				dns_db_detach(&db);
				dns_db_attach(view->cachedb, &db);
				goto db_find;
			}
		} else {
			/*
			 * We don't have the data in the cache.  If we've got
			 * glue from the zone, use it.
			 */
			if (zrdataset.methods != NULL) {
				dns_rdataset_clone(&zrdataset, rdataset);
Bob Halley's avatar
Bob Halley committed
475 476
				if (sigrdataset != NULL &&
				    zsigrdataset.methods != NULL)
Bob Halley's avatar
Bob Halley committed
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
					dns_rdataset_clone(&zsigrdataset,
							   sigrdataset);
				result = DNS_R_GLUE;
				goto cleanup;
			}
		}
		/*
		 * We don't know the answer.
		 */
		result = DNS_R_NOTFOUND;
	} else if (result == DNS_R_GLUE) {
		if (view->cachedb != NULL) {
			/*
			 * We found an answer, but the cache may be better.
			 * Remember what we've got and go look in the cache.
			 */
			is_zone = ISC_FALSE;
			version = NULL;
			dns_rdataset_clone(rdataset, &zrdataset);
			dns_rdataset_disassociate(rdataset);
Bob Halley's avatar
Bob Halley committed
497 498
			if (sigrdataset != NULL &&
			    sigrdataset->methods != NULL) {
Bob Halley's avatar
Bob Halley committed
499 500 501 502 503 504 505 506 507 508 509
				dns_rdataset_clone(sigrdataset, &zsigrdataset);
				dns_rdataset_disassociate(sigrdataset);
			}
			dns_db_detach(&db);
			dns_db_attach(view->cachedb, &db);
			goto db_find;
		}
		/*
		 * Otherwise, the glue is the best answer.
		 */
		result = ISC_R_SUCCESS;
Bob Halley's avatar
Bob Halley committed
510 511 512 513 514
	}

	if (result == DNS_R_NOTFOUND && use_hints && view->hints != NULL) {
		if (rdataset->methods != NULL)
			dns_rdataset_disassociate(rdataset);
Bob Halley's avatar
Bob Halley committed
515
		if (sigrdataset != NULL && sigrdataset->methods != NULL)
Bob Halley's avatar
Bob Halley committed
516 517 518 519 520 521 522 523
			dns_rdataset_disassociate(sigrdataset);
		dns_fixedname_init(&foundname);
		result = dns_db_find(view->hints, name, NULL, type, options,
				     now, NULL, dns_fixedname_name(&foundname),
				     rdataset, sigrdataset);
		if (result == ISC_R_SUCCESS || result == DNS_R_GLUE)
			result = DNS_R_HINT;
	}
Bob Halley's avatar
Bob Halley committed
524 525

 cleanup:
Bob Halley's avatar
Bob Halley committed
526 527
	if (result != ISC_R_SUCCESS &&
	    result != DNS_R_GLUE &&
528 529 530
	    result != DNS_R_HINT &&
	    result != DNS_R_NCACHENXDOMAIN &&
	    result != DNS_R_NCACHENXRRSET)
Bob Halley's avatar
Bob Halley committed
531 532
		result = DNS_R_NOTFOUND;

Bob Halley's avatar
Bob Halley committed
533 534 535 536 537 538 539
	if (zrdataset.methods != NULL) {
		dns_rdataset_disassociate(&zrdataset);
		if (zsigrdataset.methods != NULL)
			dns_rdataset_disassociate(&zsigrdataset);
	}
	if (db != NULL)
		dns_db_detach(&db);
540 541
	if (zone != NULL)
		dns_zone_detach(&zone);
Bob Halley's avatar
Bob Halley committed
542 543

	return (result);
544
}
545

Bob Halley's avatar
Bob Halley committed
546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
isc_result_t
dns_view_findzonecut(dns_view_t *view, dns_name_t *name, dns_name_t *fname,
		     isc_stdtime_t now, unsigned int options,
		     isc_boolean_t use_hints,
		     dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
{
	isc_result_t result;
	dns_db_t *db;
	isc_boolean_t is_zone, use_zone, try_hints;
	dns_zone_t *zone;
	dns_name_t *zfname;
	dns_rdataset_t zrdataset, zsigrdataset;
	dns_fixedname_t zfixedname;

	/*
	 * Find the best known zonecut containing 'name'.
	 */

	REQUIRE(DNS_VIEW_VALID(view));
	REQUIRE(view->frozen);

	db = NULL;
	zone = NULL;
	use_zone = ISC_FALSE;
	try_hints = ISC_FALSE;
	zfname = NULL;

	/*
	 * Initialize.
	 */
	dns_fixedname_init(&zfixedname);
	dns_rdataset_init(&zrdataset);
	dns_rdataset_init(&zsigrdataset);

	/*
	 * Find the right database.
	 */
	result = dns_zt_find(view->zonetable, name, NULL, &zone);
	if (result == DNS_R_SUCCESS || result == DNS_R_PARTIALMATCH)
		result = dns_zone_getdb(zone, &db);
	if (result == ISC_R_NOTFOUND) {
		/*
		 * We're not directly authoritative for this query name, nor
		 * is it a subdomain of any zone for which we're
		 * authoritative.
		 */
		if (view->cachedb != NULL) {
			/*
			 * We have a cache; try it.
			 */
			dns_db_attach(view->cachedb, &db);
		} else {
			/*
			 * Maybe we have hints...
			 */
			try_hints = ISC_TRUE;
			goto finish;
		}
	} else if (result != ISC_R_SUCCESS) {
		/*
		 * Something is broken.
		 */
		goto cleanup;
	}
	is_zone = dns_db_iszone(db);

 db_find:
	/*
	 * Look for the zonecut.
	 */
	if (is_zone) {
		result = dns_db_find(db, name, NULL, dns_rdatatype_ns, options,
				     now, NULL, fname, rdataset, sigrdataset);
		if (result == DNS_R_DELEGATION)
			result = ISC_R_SUCCESS;
		else if (result != ISC_R_SUCCESS)
			goto cleanup;
		if (view->cachedb != NULL && db != view->hints) {
			/*
			 * We found an answer, but the cache may be better.
			 */
			zfname = dns_fixedname_name(&zfixedname);
			result = dns_name_concatenate(fname, NULL, zfname,
						      NULL);
			if (result != ISC_R_SUCCESS)
				goto cleanup;
			dns_rdataset_clone(rdataset, &zrdataset);
			dns_rdataset_disassociate(rdataset);
			if (sigrdataset != NULL &&
			    sigrdataset->methods != NULL) {
				dns_rdataset_clone(sigrdataset, &zsigrdataset);
				dns_rdataset_disassociate(sigrdataset);
			}
			dns_db_detach(&db);
			dns_db_attach(view->cachedb, &db);
			is_zone = ISC_FALSE;
			goto db_find;
		}
	} else {
		result = dns_db_findzonecut(db, name, options, now, NULL,
					    fname, rdataset, sigrdataset);
		if (result == ISC_R_SUCCESS) {
			if (zfname != NULL &&
			    !dns_name_issubdomain(fname, zfname)) {
				/*
				 * We found a zonecut in the cache, but our
				 * zone delegation is better.
				 */
				use_zone = ISC_TRUE;
			}
		} else if (result == ISC_R_NOTFOUND) {
			if (zfname != NULL) {
				/*
				 * We didn't find anything in the cache, but we
				 * have a zone delegation, so use it.
				 */
				use_zone = ISC_TRUE;
			} else {
				/*
				 * Maybe we have hints...
				 */
				try_hints = ISC_TRUE;
			}
		} else {
			/*
			 * Something bad happened.
			 */
			goto cleanup;
		}
	}

 finish:
	if (use_zone) {
		if (rdataset->methods != NULL) {
			dns_rdataset_disassociate(rdataset);
			if (sigrdataset != NULL &&
			    sigrdataset->methods != NULL)
				dns_rdataset_disassociate(sigrdataset);
		}
		result = dns_name_concatenate(zfname, NULL, fname, NULL);
		if (result != ISC_R_SUCCESS)
			goto cleanup;
		dns_rdataset_clone(&zrdataset, rdataset);
		if (sigrdataset != NULL && zrdataset.methods != NULL)
			dns_rdataset_clone(&zsigrdataset, sigrdataset);
	} else if (try_hints && use_hints && view->hints != NULL) {
		/*
		 * We've found nothing so far, but we have hints.
		 */
		result = dns_db_find(view->hints, dns_rootname, NULL,
				     dns_rdatatype_ns, 0, now, NULL, fname,
				     rdataset, NULL);
		if (result != ISC_R_SUCCESS) {
			/*
			 * We can't even find the hints for the root
			 * nameservers!
			 */
			result = ISC_R_NOTFOUND;
		}
	}

 cleanup:
	if (zrdataset.methods != NULL) {
		dns_rdataset_disassociate(&zrdataset);
		if (zsigrdataset.methods != NULL)
			dns_rdataset_disassociate(&zsigrdataset);
	}
	if (db != NULL)
		dns_db_detach(&db);
	if (zone != NULL)
		dns_zone_detach(&zone);

	return (result);
}

721 722 723 724
isc_result_t
dns_viewlist_find(dns_viewlist_t *list, const char *name,
		  dns_rdataclass_t rdclass, dns_view_t **viewp)
{
725 726 727 728
	dns_view_t *view;

	REQUIRE(list != NULL);

729 730 731
	for (view = ISC_LIST_HEAD(*list);
	     view != NULL;
	     view = ISC_LIST_NEXT(view, link)) {
732 733 734
		if (strcmp(view->name, name) == 0 && view->rdclass == rdclass)
			break;
	}
735 736 737 738 739 740
	if (view == NULL)
		return (ISC_R_NOTFOUND);

	dns_view_attach(view, viewp);

	return (ISC_R_SUCCESS);
741
}
Mark Andrews's avatar
Mark Andrews committed
742 743 744 745 746 747 748 749

void
dns_view_load(dns_view_t *view) {

	REQUIRE(DNS_VIEW_VALID(view));

	dns_zt_load(view->zonetable);
}