Ondřej Surý
4dacdde28f
The dns_badcache unit had (yet another) own locked hashtable implementation. Replace the hashtable used by dns_badcache with lock-free cds_lfht implementation from liburcu.
153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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#pragma once
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/*****
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***** Module Info
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*****/
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/*! \file dns/badcache.h
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* \brief
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* Defines dns_badcache_t, the "bad cache" object.
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*
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* Notes:
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*\li A bad cache object is a hash table of name/type tuples,
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* indicating whether a given tuple known to be "bad" in some
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* sense (e.g., queries for that name and type have been
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* returning SERVFAIL). This is used for both the "bad server
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* cache" in the resolver and for the "servfail cache" in
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* the view.
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*
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* Reliability:
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*
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* Resources:
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*
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* Security:
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*
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* Standards:
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*/
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/***
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*** Imports
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***/
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#include <inttypes.h>
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#include <stdbool.h>
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#include <isc/mem.h>
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#include <isc/stdtime.h>
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#include <dns/types.h>
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ISC_LANG_BEGINDECLS
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/***
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*** Functions
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***/
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dns_badcache_t *
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dns_badcache_new(isc_mem_t *mctx);
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/*%
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* Allocate and initialize a badcache and store it in '*bcp'.
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*
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* Requires:
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* \li mctx != NULL
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* \li bcp != NULL
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* \li *bcp == NULL
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*/
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void
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dns_badcache_destroy(dns_badcache_t **bcp);
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/*%
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* Flush and then free badcache in 'bcp'. '*bcp' is set to NULL on return.
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*
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* Requires:
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* \li '*bcp' to be a valid badcache
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*/
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void
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dns_badcache_add(dns_badcache_t *bc, const dns_name_t *name,
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dns_rdatatype_t type, bool update, uint32_t flags,
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isc_stdtime_t expire);
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/*%
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* Adds a badcache entry to the badcache 'bc' for name 'name' and
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* type 'type'. If an entry already exists, then it will be updated if
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* 'update' is true. The entry will be stored with flags 'flags'
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* and expiration date 'expire'.
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*
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* Requires:
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* \li bc to be a valid badcache.
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* \li name != NULL
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* \li expire != NULL
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*/
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isc_result_t
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dns_badcache_find(dns_badcache_t *bc, const dns_name_t *name,
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dns_rdatatype_t type, uint32_t *flagp, isc_stdtime_t now);
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/*%
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* Returns ISC_R_SUCCESS if a record is found in the badcache 'bc' matching
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* 'name' and 'type', with an expiration date later than 'now'.
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* If 'flagp' is not NULL, then '*flagp' is updated to the flags
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* that were stored in the badcache entry. Returns ISC_R_NOTFOUND if
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* no matching record is found.
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*
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* Requires:
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* \li bc to be a valid badcache.
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* \li name != NULL
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* \li now != NULL
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*/
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void
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dns_badcache_flush(dns_badcache_t *bc);
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/*%
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* Flush the entire bad cache.
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*
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* Requires:
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* \li bc to be a valid badcache
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*/
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void
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dns_badcache_flushname(dns_badcache_t *bc, const dns_name_t *name);
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/*%
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* Flush the bad cache of all entries at 'name'.
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*
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* Requires:
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* \li bc to be a valid badcache
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* \li name != NULL
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*/
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void
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dns_badcache_flushtree(dns_badcache_t *bc, const dns_name_t *name);
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/*%
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* Flush the bad cache of all entries at or below 'name'.
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*
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* Requires:
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* \li bc to be a valid badcache
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* \li name != NULL
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*/
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void
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dns_badcache_print(dns_badcache_t *bc, const char *cachename, FILE *fp);
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/*%
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* Print the contents of badcache 'bc' (headed by the title 'cachename')
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* to file pointer 'fp'.
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*
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* Requires:
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* \li bc to be a valid badcache
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* \li cachename != NULL
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* \li fp != NULL
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*/
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ISC_LANG_ENDDECLS
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