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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* 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/refcount.h>
#include <isc/rwlock.h>
#include <isc/stdtime.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <dns/rdataset.h>
#include <dns/resolver.h>
#include <dns/types.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;
/* Protected by atomics */
isc_refcount_t references;
/* Locked by rwlock. */
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, const 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 true,
* then the NTA will persist for the entire specified lifetime.
* If it is false, then the name will be queried periodically and
* validation will be attempted to see whether it's still bogus;
* if validation is successful, the NTA will be allowed to expire
* early and validation below the NTA will resume.
*
* 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, const 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,
const dns_name_t *name, const 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, const char *view,
isc_buffer_t **buf);
/*%<
* Dump the NTA table to buffer at 'buf', with view names
*
* 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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