view.c 20.1 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
/*
 * 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>
Michael Graff's avatar
Michael Graff committed
27
#include <isc/util.h>
Bob Halley's avatar
add  
Bob Halley committed
28 29

#include <dns/types.h>
Bob Halley's avatar
add adb  
Bob Halley committed
30
#include <dns/adb.h>
31
#include <dns/cache.h>
Bob Halley's avatar
add  
Bob Halley committed
32
#include <dns/dbtable.h>
Bob Halley's avatar
Bob Halley committed
33
#include <dns/db.h>
34
#include <dns/events.h>
Bob Halley's avatar
Bob Halley committed
35
#include <dns/fixedname.h>
Bob Halley's avatar
Bob Halley committed
36
#include <dns/rbt.h>
Bob Halley's avatar
Bob Halley committed
37
#include <dns/rdataset.h>
Bob Halley's avatar
add  
Bob Halley committed
38
#include <dns/resolver.h>
Brian Wellington's avatar
Brian Wellington committed
39
#include <dns/tsig.h>
Bob Halley's avatar
add  
Bob Halley committed
40
#include <dns/view.h>
41
#include <dns/zone.h>
42
#include <dns/zt.h>
Bob Halley's avatar
add  
Bob Halley committed
43

44 45 46 47 48 49
#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
50
isc_result_t
51 52
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
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 78 79
{
	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;
	}
80 81 82 83 84 85 86 87
	result = isc_rwlock_init(&view->conflock, UINT_MAX, UINT_MAX);
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "isc_rwlock_init() failed: %s",
				 isc_result_totext(result));
		result = ISC_R_UNEXPECTED;
		goto cleanup_mutex;
	}
88 89
	view->zonetable = NULL;
	result = dns_zt_create(mctx, rdclass, &view->zonetable);
Bob Halley's avatar
add  
Bob Halley committed
90 91
	if (result != ISC_R_SUCCESS) {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
92
				 "dns_zt_create() failed: %s",
Bob Halley's avatar
add  
Bob Halley committed
93 94
				 isc_result_totext(result));
		result = ISC_R_UNEXPECTED;
95
		goto cleanup_rwlock;
Bob Halley's avatar
add  
Bob Halley committed
96
	}
Bob Halley's avatar
Bob Halley committed
97 98 99 100 101 102 103
	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;
104
		goto cleanup_zt;
Bob Halley's avatar
Bob Halley committed
105
	}
106

107
	view->cache = NULL;
Bob Halley's avatar
Bob Halley committed
108
	view->cachedb = NULL;
Bob Halley's avatar
Bob Halley committed
109
	view->hints = NULL;
Bob Halley's avatar
add  
Bob Halley committed
110
	view->resolver = NULL;
Bob Halley's avatar
add adb  
Bob Halley committed
111
	view->adb = NULL;
Bob Halley's avatar
add  
Bob Halley committed
112 113
	view->mctx = mctx;
	view->rdclass = rdclass;
Bob Halley's avatar
Bob Halley committed
114
	view->frozen = ISC_FALSE;
115
	view->task = NULL;
Bob Halley's avatar
add  
Bob Halley committed
116
	view->references = 1;
117
	view->attributes = (DNS_VIEWATTR_RESSHUTDOWN|DNS_VIEWATTR_ADBSHUTDOWN);
Brian Wellington's avatar
Brian Wellington committed
118 119
	view->statickeys = NULL;
	view->dynamickeys = NULL;
120
	result = dns_tsigkeyring_create(view->mctx, &view->dynamickeys);
121 122
	if (result != DNS_R_SUCCESS)
		goto cleanup_zt;
Michael Graff's avatar
Michael Graff committed
123
	ISC_LINK_INIT(view, link);
124 125 126 127 128 129
	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
130 131 132 133 134 135
	view->magic = DNS_VIEW_MAGIC;
	
	*viewp = view;

	return (ISC_R_SUCCESS);

136 137
 cleanup_zt:
	dns_zt_detach(&view->zonetable);
Bob Halley's avatar
Bob Halley committed
138

139 140 141
 cleanup_rwlock:
	isc_rwlock_destroy(&view->conflock);

Bob Halley's avatar
add  
Bob Halley committed
142 143 144 145 146 147 148 149 150 151 152 153 154 155
 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
156 157 158 159 160

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

Bob Halley's avatar
add  
Bob Halley committed
161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177
	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));
178 179 180
	REQUIRE(view->references == 0);
	REQUIRE(RESSHUTDOWN(view));
	REQUIRE(ADBSHUTDOWN(view));
Bob Halley's avatar
add  
Bob Halley committed
181

182
	if (view->dynamickeys != NULL)	
183
		dns_tsigkeyring_destroy(&view->dynamickeys);
184
	if (view->statickeys != NULL)	
185
		dns_tsigkeyring_destroy(&view->statickeys);
Bob Halley's avatar
add adb  
Bob Halley committed
186 187
	if (view->adb != NULL)
		dns_adb_detach(&view->adb);
Bob Halley's avatar
add  
Bob Halley committed
188 189
	if (view->resolver != NULL)
		dns_resolver_detach(&view->resolver);
190 191
	if (view->task != NULL)
		isc_task_detach(&view->task);
Bob Halley's avatar
Bob Halley committed
192 193
	if (view->hints != NULL)
		dns_db_detach(&view->hints);
Bob Halley's avatar
Bob Halley committed
194 195
	if (view->cachedb != NULL)
		dns_db_detach(&view->cachedb);
196 197
	if (view->cache != NULL)
		dns_cache_detach(&view->cache);
198
	dns_zt_detach(&view->zonetable);
Bob Halley's avatar
Bob Halley committed
199
	dns_rbt_destroy(&view->secroots);
Bob Halley's avatar
add  
Bob Halley committed
200 201 202 203 204
	isc_mutex_destroy(&view->lock);
	isc_mem_free(view->mctx, view->name);
	isc_mem_put(view->mctx, view, sizeof *view);
}

205 206 207 208 209 210 211 212 213 214 215 216
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
217 218 219
void
dns_view_detach(dns_view_t **viewp) {
	dns_view_t *view;
220
	isc_boolean_t done = ISC_FALSE;
Bob Halley's avatar
add  
Bob Halley committed
221

Bob Halley's avatar
Bob Halley committed
222 223 224 225
	/*
	 * Detach '*viewp' from its view.
	 */

Bob Halley's avatar
add  
Bob Halley committed
226 227 228 229 230 231 232 233
	REQUIRE(viewp != NULL);
	view = *viewp;
	REQUIRE(DNS_VIEW_VALID(view));

	LOCK(&view->lock);

	INSIST(view->references > 0);
	view->references--;
234 235 236 237 238 239 240
	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
241 242 243 244
	UNLOCK(&view->lock);

	*viewp = NULL;

245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
	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
290 291
		destroy(view);
}
292

Bob Halley's avatar
Bob Halley committed
293
isc_result_t
Bob Halley's avatar
Bob Halley committed
294 295 296 297
dns_view_createresolver(dns_view_t *view,
			isc_taskmgr_t *taskmgr, unsigned int ntasks,
			isc_socketmgr_t *socketmgr,
			isc_timermgr_t *timermgr,
298 299 300
			unsigned int options,
			dns_dispatch_t *dispatchv4,
			dns_dispatch_t *dispatchv6)
Bob Halley's avatar
Bob Halley committed
301
{
Bob Halley's avatar
add adb  
Bob Halley committed
302
	isc_result_t result;
303
	isc_event_t *event;
Bob Halley's avatar
add adb  
Bob Halley committed
304

Bob Halley's avatar
Bob Halley committed
305
	/*
Bob Halley's avatar
add adb  
Bob Halley committed
306
	 * Create a resolver and address database for the view.
Bob Halley's avatar
Bob Halley committed
307 308
	 */

309
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
310
	REQUIRE(!view->frozen);
311
	REQUIRE(view->resolver == NULL);
312 313 314 315

	result = isc_task_create(taskmgr, view->mctx, 0, &view->task);
	if (result != ISC_R_SUCCESS)
		return (result);
Bob Halley's avatar
Bob Halley committed
316
	isc_task_setname(view->task, "view", view);
317

Bob Halley's avatar
add adb  
Bob Halley committed
318
	result = dns_resolver_create(view, taskmgr, ntasks, socketmgr,
319 320
				     timermgr, options, dispatchv4, dispatchv6,
				     &view->resolver);
321 322
	if (result != ISC_R_SUCCESS) {
		isc_task_detach(&view->task);
Bob Halley's avatar
add adb  
Bob Halley committed
323
		return (result);
324 325 326 327 328
	}
	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
329 330
	result = dns_adb_create(view->mctx, view, timermgr, taskmgr,
				&view->adb);
331 332 333 334 335 336 337
	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
338

339
	return (ISC_R_SUCCESS);
340 341 342
}

void
343
dns_view_setcache(dns_view_t *view, dns_cache_t *cache) {
Bob Halley's avatar
Bob Halley committed
344 345

	/*
346
	 * Set the view's cache.
Bob Halley's avatar
Bob Halley committed
347 348
	 */

349
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
350
	REQUIRE(!view->frozen);
351

352
	if (view->cache != NULL) {
Bob Halley's avatar
add adb  
Bob Halley committed
353
		dns_db_detach(&view->cachedb);
354 355 356 357 358
		dns_cache_detach(&view->cache);
	}
	dns_cache_attach(cache, &view->cache);
	dns_cache_attachdb(cache, &view->cachedb);
	INSIST(DNS_DB_VALID(view->cachedb));
359 360
}

Bob Halley's avatar
Bob Halley committed
361 362 363 364 365 366 367 368 369 370 371 372 373 374 375
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);
}

Brian Wellington's avatar
Brian Wellington committed
376 377 378
void
dns_view_setkeyring(dns_view_t *view, dns_tsig_keyring_t *ring) {
	/*
379
	 * Set the view's static TSIG keyring.
Brian Wellington's avatar
Brian Wellington committed
380 381 382
	 */
	REQUIRE(DNS_VIEW_VALID(view));
	REQUIRE(ring != NULL);
383
	if (view->statickeys != NULL)
384
		dns_tsigkeyring_destroy(&view->statickeys);
Brian Wellington's avatar
Brian Wellington committed
385 386 387
	view->statickeys = ring;
}

388
isc_result_t
389
dns_view_addzone(dns_view_t *view, dns_zone_t *zone) {
Bob Halley's avatar
Bob Halley committed
390 391 392
	isc_result_t result;

	/*
393
	 * Add zone 'zone' to 'view'.
Bob Halley's avatar
Bob Halley committed
394 395
	 */

396
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
397 398
	REQUIRE(!view->frozen);

399
	result = dns_zt_mount(view->zonetable, zone);
400

Bob Halley's avatar
Bob Halley committed
401
	return (result);
402 403 404 405
}

void
dns_view_freeze(dns_view_t *view) {
Bob Halley's avatar
Bob Halley committed
406 407 408 409 410 411 412 413
	
	/*
	 * Freeze view.
	 */

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

414 415
	if (view->resolver != NULL) {
		INSIST(view->cachedb != NULL);
Bob Halley's avatar
Bob Halley committed
416
		dns_resolver_freeze(view->resolver);
417
	}
Bob Halley's avatar
Bob Halley committed
418 419 420
	view->frozen = ISC_TRUE;
}

421
isc_result_t
422
dns_view_findzone(dns_view_t *view, dns_name_t *name, dns_zone_t **zonep) {
423 424 425 426
	isc_result_t result;

	REQUIRE(DNS_VIEW_VALID(view));

427
	result = dns_zt_find(view->zonetable, name, NULL, zonep);
428
	if (result == DNS_R_PARTIALMATCH) {
429
		dns_zone_detach(zonep);
430 431
		result = DNS_R_NOTFOUND;
	}
432

433 434 435
	return (result);
}

Bob Halley's avatar
Bob Halley committed
436 437
isc_result_t
dns_view_find(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
438 439
	      isc_stdtime_t now, unsigned int options,
	      isc_boolean_t use_hints, dns_name_t *foundname,
Bob Halley's avatar
Bob Halley committed
440 441 442 443 444 445 446
	      dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
{
	isc_result_t result;
	dns_db_t *db;
	dns_dbversion_t *version;
	isc_boolean_t is_zone;
	dns_rdataset_t zrdataset, zsigrdataset;
447
	dns_zone_t *zone;
Bob Halley's avatar
Bob Halley committed
448 449 450 451 452 453

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

454
	REQUIRE(DNS_VIEW_VALID(view));
Bob Halley's avatar
Bob Halley committed
455 456 457 458 459 460 461 462 463 464 465 466
	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.
	 */
467
	zone = NULL;
Bob Halley's avatar
Bob Halley committed
468
	db = NULL;
469 470 471 472 473 474 475 476
	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
477
		dns_db_attach(view->cachedb, &db);
478
	else
Bob Halley's avatar
Bob Halley committed
479 480 481
		goto cleanup;

	is_zone = dns_db_iszone(db);
482

Bob Halley's avatar
Bob Halley committed
483 484 485 486 487
 db_find:
	/*
	 * Now look for an answer in the database.
	 */
	result = dns_db_find(db, name, NULL, type, options,
488
			     now, NULL, foundname, rdataset, sigrdataset);
Bob Halley's avatar
Bob Halley committed
489 490

	if (result == DNS_R_DELEGATION ||
Bob Halley's avatar
Bob Halley committed
491
	    result == DNS_R_NOTFOUND) {
Bob Halley's avatar
Bob Halley committed
492 493
		if (rdataset->methods != NULL)
			dns_rdataset_disassociate(rdataset);
Bob Halley's avatar
Bob Halley committed
494
		if (sigrdataset != NULL && sigrdataset->methods != NULL)
Bob Halley's avatar
Bob Halley committed
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514
			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
515 516
				if (sigrdataset != NULL &&
				    zsigrdataset.methods != NULL)
Bob Halley's avatar
Bob Halley committed
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
					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
537 538
			if (sigrdataset != NULL &&
			    sigrdataset->methods != NULL) {
Bob Halley's avatar
Bob Halley committed
539 540 541 542 543 544 545 546 547 548 549
				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
550 551 552 553 554
	}

	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
555
		if (sigrdataset != NULL && sigrdataset->methods != NULL)
Bob Halley's avatar
Bob Halley committed
556 557
			dns_rdataset_disassociate(sigrdataset);
		result = dns_db_find(view->hints, name, NULL, type, options,
558
				     now, NULL, foundname,
Bob Halley's avatar
Bob Halley committed
559
				     rdataset, sigrdataset);
Bob Halley's avatar
Bob Halley committed
560 561 562 563 564 565
		if (result == ISC_R_SUCCESS || result == DNS_R_GLUE) {
			/*
			 * We just used a hint.  Let the resolver know it
			 * should consider priming.
			 */
			dns_resolver_prime(view->resolver);
Bob Halley's avatar
Bob Halley committed
566
			result = DNS_R_HINT;
Bob Halley's avatar
Bob Halley committed
567 568
		} else if (result == DNS_R_NXDOMAIN ||
			   result == DNS_R_NXRDATASET)
569
			result = DNS_R_NOTFOUND;
Bob Halley's avatar
Bob Halley committed
570
	}
Bob Halley's avatar
Bob Halley committed
571 572

 cleanup:
573 574 575 576 577 578 579 580 581
	if (result == DNS_R_NXDOMAIN || result == DNS_R_NXRRSET) {
		/*
		 * We don't care about any DNSSEC proof data in these cases.
		 */
		if (rdataset->methods != NULL)
			dns_rdataset_disassociate(rdataset);
		if (sigrdataset != NULL && sigrdataset->methods != NULL)
			dns_rdataset_disassociate(sigrdataset);
	}
Bob Halley's avatar
Bob Halley committed
582

Bob Halley's avatar
Bob Halley committed
583 584 585 586 587 588 589
	if (zrdataset.methods != NULL) {
		dns_rdataset_disassociate(&zrdataset);
		if (zsigrdataset.methods != NULL)
			dns_rdataset_disassociate(&zsigrdataset);
	}
	if (db != NULL)
		dns_db_detach(&db);
590 591
	if (zone != NULL)
		dns_zone_detach(&zone);
Bob Halley's avatar
Bob Halley committed
592 593

	return (result);
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
isc_result_t
dns_view_simplefind(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
		    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_fixedname_t foundname;

	dns_fixedname_init(&foundname);
	result = dns_view_find(view, name, type, now, options, use_hints,
			       dns_fixedname_name(&foundname),
			       rdataset, sigrdataset);
	if (result != ISC_R_SUCCESS &&
	    result != DNS_R_GLUE &&
	    result != DNS_R_HINT &&
	    result != DNS_R_NCACHENXDOMAIN &&
	    result != DNS_R_NCACHENXRRSET &&
	    result != DNS_R_NXDOMAIN &&
	    result != DNS_R_NXRRSET &&
	    result != DNS_R_NOTFOUND) {
		if (rdataset->methods != NULL)
			dns_rdataset_disassociate(rdataset);
		if (sigrdataset != NULL && sigrdataset->methods != NULL)
			dns_rdataset_disassociate(sigrdataset);
		result = DNS_R_NOTFOUND;
	}

	return (result);
}

Bob Halley's avatar
Bob Halley committed
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
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);
}

802 803 804 805
isc_result_t
dns_viewlist_find(dns_viewlist_t *list, const char *name,
		  dns_rdataclass_t rdclass, dns_view_t **viewp)
{
806 807 808 809
	dns_view_t *view;

	REQUIRE(list != NULL);

810 811 812
	for (view = ISC_LIST_HEAD(*list);
	     view != NULL;
	     view = ISC_LIST_NEXT(view, link)) {
813 814 815
		if (strcmp(view->name, name) == 0 && view->rdclass == rdclass)
			break;
	}
816 817 818 819 820 821
	if (view == NULL)
		return (ISC_R_NOTFOUND);

	dns_view_attach(view, viewp);

	return (ISC_R_SUCCESS);
822
}
Mark Andrews's avatar
Mark Andrews committed
823

824 825
isc_result_t
dns_view_load(dns_view_t *view, isc_boolean_t stop) {
Mark Andrews's avatar
Mark Andrews committed
826 827 828

	REQUIRE(DNS_VIEW_VALID(view));

829
	return (dns_zt_load(view->zonetable, stop));
Mark Andrews's avatar
Mark Andrews committed
830
}
Brian Wellington's avatar
Brian Wellington committed
831 832 833 834 835 836 837 838 839 840

isc_result_t
dns_view_checksig(dns_view_t *view, isc_buffer_t *source, dns_message_t *msg) {
	REQUIRE(DNS_VIEW_VALID(view));
	REQUIRE(source != NULL);

	return dns_tsig_verify(source, msg, view->statickeys,
			       view->dynamickeys);
}