/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef DNS_LOOKUP_H #define DNS_LOOKUP_H 1 /***** ***** Module Info *****/ /*! \file dns/lookup.h * \brief * The lookup module performs simple DNS lookups. It implements * the full resolver algorithm, both looking for local data and * resolving external names as necessary. * * MP: *\li The module ensures appropriate synchronization of data structures it * creates and manipulates. * * Reliability: *\li No anticipated impact. * * Resources: *\li TBS * * Security: *\li No anticipated impact. * * Standards: *\li RFCs: 1034, 1035, 2181, TBS *\li Drafts: TBS */ #include <isc/lang.h> #include <isc/event.h> #include <dns/types.h> ISC_LANG_BEGINDECLS /*% * A 'dns_lookupevent_t' is returned when a lookup completes. * The sender field will be set to the lookup that completed. If 'result' * is ISC_R_SUCCESS, then 'names' will contain a list of names associated * with the address. The recipient of the event must not change the list * and must not refer to any of the name data after the event is freed. */ typedef struct dns_lookupevent { ISC_EVENT_COMMON(struct dns_lookupevent); isc_result_t result; dns_name_t *name; dns_rdataset_t *rdataset; dns_rdataset_t *sigrdataset; dns_db_t *db; dns_dbnode_t *node; } dns_lookupevent_t; isc_result_t dns_lookup_create(isc_mem_t *mctx, dns_name_t *name, dns_rdatatype_t type, dns_view_t *view, unsigned int options, isc_task_t *task, isc_taskaction_t action, void *arg, dns_lookup_t **lookupp); /*%< * Finds the rrsets matching 'name' and 'type'. * * Requires: * *\li 'mctx' is a valid mctx. * *\li 'name' is a valid name. * *\li 'view' is a valid view which has a resolver. * *\li 'task' is a valid task. * *\li lookupp != NULL && *lookupp == NULL * * Returns: * *\li ISC_R_SUCCESS *\li ISC_R_NOMEMORY * *\li Any resolver-related error (e.g. ISC_R_SHUTTINGDOWN) may also be * returned. */ void dns_lookup_cancel(dns_lookup_t *lookup); /*%< * Cancel 'lookup'. * * Notes: * *\li If 'lookup' has not completed, post its LOOKUPDONE event with a * result code of ISC_R_CANCELED. * * Requires: * *\li 'lookup' is a valid lookup. */ void dns_lookup_destroy(dns_lookup_t **lookupp); /*%< * Destroy 'lookup'. * * Requires: * *\li '*lookupp' is a valid lookup. * *\li The caller has received the LOOKUPDONE event (either because the * lookup completed or because dns_lookup_cancel() was called). * * Ensures: * *\li *lookupp == NULL. */ ISC_LANG_ENDDECLS #endif /* DNS_LOOKUP_H */