src/resolve/resolved-dns-scope.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 "list.h"
  24
  25 typedef struct DnsScope DnsScope;
  26
  27 #include "resolved-dns-cache.h"
  28 #include "resolved-dns-dnssec.h"
  29 #include "resolved-dns-packet.h"
  30 #include "resolved-dns-query.h"
  31 #include "resolved-dns-search-domain.h"
  32 #include "resolved-dns-server.h"
  33 #include "resolved-dns-stream.h"
  34 #include "resolved-dns-zone.h"
  35 #include "resolved-link.h"
  36
  37 typedef enum DnsScopeMatch {
  38         DNS_SCOPE_NO,
  39         DNS_SCOPE_MAYBE,
  40         DNS_SCOPE_YES,
  41         _DNS_SCOPE_MATCH_MAX,
  42         _DNS_SCOPE_INVALID = -1
  43 } DnsScopeMatch;
  44
  45 struct DnsScope {
  46         Manager *manager;
  47
  48         DnsProtocol protocol;
  49         int family;
  50         DnssecMode dnssec_mode;
  51
  52         Link *link;
  53
  54         DnsCache cache;
  55         DnsZone zone;
  56
  57         OrderedHashmap *conflict_queue;
  58         sd_event_source *conflict_event_source;
  59
  60         bool announced:1;
  61         sd_event_source *announce_event_source;
  62
  63         RateLimit ratelimit;
  64
  65         usec_t resend_timeout;
  66         usec_t max_rtt;
  67
  68         LIST_HEAD(DnsQueryCandidate, query_candidates);
  69
  70         /* Note that we keep track of ongoing transactions in two
  71          * ways: once in a hashmap, indexed by the rr key, and once in
  72          * a linked list. We use the hashmap to quickly find
  73          * transactions we can reuse for a key. But note that there
  74          * might be multiple transactions for the same key (because
  75          * the zone probing can't reuse a transaction answered from
  76          * the zone or the cache), and the hashmap only tracks the
  77          * most recent entry. */
  78         Hashmap *transactions_by_key;
  79         LIST_HEAD(DnsTransaction, transactions);
  80
  81         LIST_FIELDS(DnsScope, scopes);
  82 };
  83
  84 int dns_scope_new(Manager *m, DnsScope **ret, Link *l, DnsProtocol p, int family);
  85 DnsScope* dns_scope_free(DnsScope *s);
  86
  87 void dns_scope_packet_received(DnsScope *s, usec_t rtt);
  88 void dns_scope_packet_lost(DnsScope *s, usec_t usec);
  89
  90 int dns_scope_emit_udp(DnsScope *s, int fd, DnsPacket *p);
  91 int dns_scope_socket_tcp(DnsScope *s, int family, const union in_addr_union *address, DnsServer *server, uint16_t port);
  92 int dns_scope_socket_udp(DnsScope *s, DnsServer *server, uint16_t port);
  93
  94 DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain);
  95 bool dns_scope_good_key(DnsScope *s, const DnsResourceKey *key);
  96
  97 DnsServer *dns_scope_get_dns_server(DnsScope *s);
  98 void dns_scope_next_dns_server(DnsScope *s);
  99
 100 int dns_scope_llmnr_membership(DnsScope *s, bool b);
 101 int dns_scope_mdns_membership(DnsScope *s, bool b);
 102
 103 int dns_scope_make_reply_packet(DnsScope *s, uint16_t id, int rcode, DnsQuestion *q, DnsAnswer *answer, DnsAnswer *soa, bool tentative, DnsPacket **ret);
 104 void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p);
 105
 106 DnsTransaction *dns_scope_find_transaction(DnsScope *scope, DnsResourceKey *key, bool cache_ok);
 107
 108 int dns_scope_notify_conflict(DnsScope *scope, DnsResourceRecord *rr);
 109 void dns_scope_check_conflicts(DnsScope *scope, DnsPacket *p);
 110
 111 void dns_scope_dump(DnsScope *s, FILE *f);
 112
 113 DnsSearchDomain *dns_scope_get_search_domains(DnsScope *s);
 114
 115 bool dns_scope_name_needs_search_domain(DnsScope *s, const char *name);
 116
 117 bool dns_scope_network_good(DnsScope *s);
 118
 119 int dns_scope_ifindex(DnsScope *s);
 120
 121 int dns_scope_announce(DnsScope *scope, bool goodbye);