src/resolve/resolved-dns-cache.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2014 Lennart Poettering
   8
   9   systemd is free software; you can redistribute it and/or modify it
  10   under the terms of the GNU Lesser General Public License as published by
  11   the Free Software Foundation; either version 2.1 of the License, or
  12   (at your option) any later version.
  13
  14   systemd is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  21 ***/
  22
  23 #include "hashmap.h"
  24 #include "list.h"
  25 #include "prioq.h"
  26 #include "time-util.h"
  27
  28 typedef struct DnsCache {
  29         Hashmap *by_key;
  30         Prioq *by_expiry;
  31         unsigned n_hit;
  32         unsigned n_miss;
  33 } DnsCache;
  34
  35 #include "resolved-dns-answer.h"
  36 #include "resolved-dns-packet.h"
  37 #include "resolved-dns-question.h"
  38 #include "resolved-dns-rr.h"
  39
  40 void dns_cache_flush(DnsCache *c);
  41 void dns_cache_prune(DnsCache *c);
  42
  43 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);
  44 int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, bool clamp_ttl, int *rcode, DnsAnswer **answer, bool *authenticated);
  45
  46 int dns_cache_check_conflicts(DnsCache *cache, DnsResourceRecord *rr, int owner_family, const union in_addr_union *owner_address);
  47
  48 void dns_cache_dump(DnsCache *cache, FILE *f);
  49 bool dns_cache_is_empty(DnsCache *cache);
  50
  51 unsigned dns_cache_size(DnsCache *cache);
  52
  53 int dns_cache_export_shared_to_packet(DnsCache *cache, DnsPacket *p);