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ncache.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_NCACHE_H #define DNS_NCACHE_H 1 /***** ***** Module Info *****/ /*! \file dns/ncache.h *\brief * DNS Ncache * * XXX TBS XXX * * MP: *\li The caller must ensure any required synchronization. * * Reliability: *\li No anticipated impact. * * Resources: *\li TBS * * Security: *\li No anticipated impact. * * Standards: *\li RFC2308 */ #include <stdbool.h> #include <isc/lang.h> #include <isc/stdtime.h> #include <dns/types.h> ISC_LANG_BEGINDECLS /*% * _OMITDNSSEC: * Omit DNSSEC records when rendering. */ #define DNS_NCACHETOWIRE_OMITDNSSEC 0x0001 isc_result_t dns_ncache_add(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node, dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl, dns_rdataset_t *addedrdataset); isc_result_t dns_ncache_addoptout(dns_message_t *message, dns_db_t *cache, dns_dbnode_t *node, dns_rdatatype_t covers, isc_stdtime_t now, dns_ttl_t maxttl, bool optout, dns_rdataset_t *addedrdataset); /*%< * Convert the authority data from 'message' into a negative cache * rdataset, and store it in 'cache' at 'node' with a TTL limited to * 'maxttl'. * * \li dns_ncache_add produces a negative cache entry with a trust of no * more than answer * \li dns_ncache_addoptout produces a negative cache entry which will have * a trust of secure if all the records that make up the entry are secure. * * The 'covers' argument is the RR type whose nonexistence we are caching, * or dns_rdatatype_any when caching a NXDOMAIN response. * * 'optout' indicates a DNS_RDATASETATTR_OPTOUT should be set. * * Note: *\li If 'addedrdataset' is not NULL, then it will be attached to the added * rdataset. See dns_db_addrdataset() for more details. * * Requires: *\li 'message' is a valid message with a properly formatting negative cache * authority section. * *\li The requirements of dns_db_addrdataset() apply to 'cache', 'node', * 'now', and 'addedrdataset'. * * Returns: *\li #ISC_R_SUCCESS *\li #ISC_R_NOSPACE * *\li Any result code of dns_db_addrdataset() is a possible result code * of dns_ncache_add(). */ isc_result_t dns_ncache_towire(dns_rdataset_t *rdataset, dns_compress_t *cctx, isc_buffer_t *target, unsigned int options, unsigned int *countp); /*%< * Convert the negative caching rdataset 'rdataset' to wire format, * compressing names as specified in 'cctx', and storing the result in * 'target'. If 'omit_dnssec' is set, DNSSEC records will not * be added to 'target'. * * Notes: *\li The number of RRs added to target will be added to *countp. * * Requires: *\li 'rdataset' is a valid negative caching rdataset. * *\li 'rdataset' is not empty. * *\li 'countp' is a valid pointer. * * Ensures: *\li On a return of ISC_R_SUCCESS, 'target' contains a wire format * for the data contained in 'rdataset'. Any error return leaves * the buffer unchanged. * *\li *countp has been incremented by the number of RRs added to * target. * * Returns: *\li #ISC_R_SUCCESS - all ok *\li #ISC_R_NOSPACE - 'target' doesn't have enough room * *\li Any error returned by dns_rdata_towire(), dns_rdataset_next(), * dns_name_towire(). */ isc_result_t dns_ncache_getrdataset(dns_rdataset_t *ncacherdataset, dns_name_t *name, dns_rdatatype_t type, dns_rdataset_t *rdataset); /*%< * Search the negative caching rdataset for an rdataset with the * specified name and type. * * Requires: *\li 'ncacherdataset' is a valid negative caching rdataset. * *\li 'ncacherdataset' is not empty. * *\li 'name' is a valid name. * *\li 'type' is not SIG, or a meta-RR type. * *\li 'rdataset' is a valid disassociated rdataset. * * Ensures: *\li On a return of ISC_R_SUCCESS, 'rdataset' is bound to the found * rdataset. * * Returns: *\li #ISC_R_SUCCESS - the rdataset was found. *\li #ISC_R_NOTFOUND - the rdataset was not found. * */ isc_result_t dns_ncache_getsigrdataset(dns_rdataset_t *ncacherdataset, dns_name_t *name, dns_rdatatype_t covers, dns_rdataset_t *rdataset); /*%< * Similar to dns_ncache_getrdataset() but get the rrsig that matches. */ void dns_ncache_current(dns_rdataset_t *ncacherdataset, dns_name_t *found, dns_rdataset_t *rdataset); /*%< * Extract the current rdataset and name from a ncache entry. * * Requires: * \li 'ncacherdataset' to be valid and to be a negative cache entry * \li 'found' to be valid. * \li 'rdataset' to be unassociated. */ ISC_LANG_ENDDECLS #endif /* DNS_NCACHE_H */
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