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nta.h
/* * 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 https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef DNS_NTA_H #define DNS_NTA_H 1 /***** ***** Module Info *****/ /*! \file * \brief * The NTA module provides services for storing and retrieving negative * trust anchors, and determine whether a given domain is subject to * DNSSEC validation. */ #include <inttypes.h> #include <stdbool.h> #include <isc/buffer.h> #include <isc/lang.h> #include <isc/magic.h> #include <isc/rwlock.h> #include <isc/stdtime.h> #include <isc/task.h> #include <isc/timer.h> #include <dns/types.h> #include <dns/rdataset.h> #include <dns/resolver.h> #include <dns/view.h> ISC_LANG_BEGINDECLS struct dns_ntatable { /* Unlocked. */ unsigned int magic; dns_view_t *view; isc_rwlock_t rwlock; isc_taskmgr_t *taskmgr; isc_timermgr_t *timermgr; isc_task_t *task; /* Locked by rwlock. */ uint32_t references; dns_rbt_t *table; bool shuttingdown; }; #define NTATABLE_MAGIC ISC_MAGIC('N', 'T', 'A', 't') #define VALID_NTATABLE(nt) ISC_MAGIC_VALID(nt, NTATABLE_MAGIC) isc_result_t dns_ntatable_create(dns_view_t *view, isc_taskmgr_t *taskmgr, isc_timermgr_t *timermgr, dns_ntatable_t **ntatablep); /*%< * Create an NTA table in view 'view'. * * Requires: * *\li 'view' is a valid view. * *\li 'tmgr' is a valid timer manager. * *\li ntatablep != NULL && *ntatablep == NULL * * Ensures: * *\li On success, *ntatablep is a valid, empty NTA table. * * Returns: * *\li ISC_R_SUCCESS *\li Any other result indicates failure. */ void dns_ntatable_attach(dns_ntatable_t *source, dns_ntatable_t **targetp); /*%< * Attach *targetp to source. * * Requires: * *\li 'source' is a valid ntatable. * *\li 'targetp' points to a NULL dns_ntatable_t *. * * Ensures: * *\li *targetp is attached to source. */ void dns_ntatable_detach(dns_ntatable_t **ntatablep); /*%< * Detach *ntatablep from its ntatable. * * Requires: * *\li 'ntatablep' points to a valid ntatable. * * Ensures: * *\li *ntatablep is NULL. * *\li If '*ntatablep' is the last reference to the ntatable, * all resources used by the ntatable will be freed */ isc_result_t dns_ntatable_add(dns_ntatable_t *ntatable, dns_name_t *name, bool force, isc_stdtime_t now, uint32_t lifetime); /*%< * Add a negative trust anchor to 'ntatable' for name 'name', * which will expire at time 'now' + 'lifetime'. If 'force' is false, * then the name will be checked periodically to see if it's bogus; * if not, then the NTA will be allowed to expire early. * * Notes: * *\li If an NTA already exists in the table, its expiry time * is updated. * * Requires: * *\li 'ntatable' points to a valid ntatable. * *\li 'name' points to a valid name. * * Returns: * *\li ISC_R_SUCCESS * *\li Any other result indicates failure. */ isc_result_t dns_ntatable_delete(dns_ntatable_t *ntatable, dns_name_t *keyname); /*%< * Delete node(s) from 'ntatable' matching name 'keyname' * * Requires: * *\li 'ntatable' points to a valid ntatable. * *\li 'name' is not NULL * * Returns: * *\li ISC_R_SUCCESS * *\li Any other result indicates failure. */ bool dns_ntatable_covered(dns_ntatable_t *ntatable, isc_stdtime_t now, dns_name_t *name, dns_name_t *anchor); /*%< * Return true if 'name' is below a non-expired negative trust * anchor which in turn is at or below 'anchor'. * * If 'ntatable' has not been initialized, return false. * * Requires: * *\li 'ntatable' is NULL or is a valid ntatable. * *\li 'name' is a valid absolute name. */ isc_result_t dns_ntatable_totext(dns_ntatable_t *ntatable, isc_buffer_t **buf); /*%< * Dump the NTA table to buffer at 'buf' * * Requires: * \li "ntatable" is a valid table. * * \li "*buf" is a valid buffer. */ isc_result_t dns_ntatable_dump(dns_ntatable_t *ntatable, FILE *fp); /*%< * Dump the NTA table to the file opened as 'fp'. */ isc_result_t dns_ntatable_save(dns_ntatable_t *ntatable, FILE *fp); /*%< * Save the NTA table to the file opened as 'fp', for later loading. */ void dns_ntatable_shutdown(dns_ntatable_t *ntatable); /*%< * Cancel future checks to see if NTAs can be removed. */ ISC_LANG_ENDDECLS #endif /* DNS_NTA_H */
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