17c8de633f
When we return the full RR wire data, let's make sure the TTL included in it is adjusted by the time the RR sat in the cache. As an optimization we do this only for ResolveRecord() and not for ResolveHostname() and friends, since adjusting the TTL means copying the RR object, and we don#t want to do that if there's no reason to. (ResolveHostname() and friends don't return the TTL hence there's no reason to in that case)
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "hashmap.h"
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#include "list.h"
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#include "prioq.h"
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#include "time-util.h"
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typedef struct DnsCache {
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Hashmap *by_key;
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Prioq *by_expiry;
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unsigned n_hit;
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unsigned n_miss;
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} DnsCache;
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#include "resolved-dns-answer.h"
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#include "resolved-dns-packet.h"
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#include "resolved-dns-question.h"
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#include "resolved-dns-rr.h"
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void dns_cache_flush(DnsCache *c);
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void dns_cache_prune(DnsCache *c);
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int dns_cache_put(DnsCache *c, DnsResourceKey *key, int rcode, DnsAnswer *answer, bool authenticated, uint32_t nsec_ttl, usec_t timestamp, int owner_family, const union in_addr_union *owner_address);
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int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, bool clamp_ttl, int *rcode, DnsAnswer **answer, bool *authenticated);
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int dns_cache_check_conflicts(DnsCache *cache, DnsResourceRecord *rr, int owner_family, const union in_addr_union *owner_address);
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void dns_cache_dump(DnsCache *cache, FILE *f);
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bool dns_cache_is_empty(DnsCache *cache);
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unsigned dns_cache_size(DnsCache *cache);
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int dns_cache_export_shared_to_packet(DnsCache *cache, DnsPacket *p);
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