src/resolve/resolved-dns-scope.h

   1 #pragma once
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2014 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "list.h"
  23
  24 typedef struct DnsScope DnsScope;
  25
  26 #include "resolved-dns-cache.h"
  27 #include "resolved-dns-dnssec.h"
  28 #include "resolved-dns-packet.h"
  29 #include "resolved-dns-query.h"
  30 #include "resolved-dns-search-domain.h"
  31 #include "resolved-dns-server.h"
  32 #include "resolved-dns-stream.h"
  33 #include "resolved-dns-zone.h"
  34 #include "resolved-link.h"
  35
  36 typedef enum DnsScopeMatch {
  37         DNS_SCOPE_NO,
  38         DNS_SCOPE_MAYBE,
  39         DNS_SCOPE_YES,
  40         _DNS_SCOPE_MATCH_MAX,
  41         _DNS_SCOPE_INVALID = -1
  42 } DnsScopeMatch;
  43
  44 struct DnsScope {
  45         Manager *manager;
  46
  47         DnsProtocol protocol;
  48         int family;
  49         DnssecMode dnssec_mode;
  50
  51         Link *link;
  52
  53         DnsCache cache;
  54         DnsZone zone;
  55
  56         OrderedHashmap *conflict_queue;
  57         sd_event_source *conflict_event_source;
  58
  59         bool announced:1;
  60         sd_event_source *announce_event_source;
  61
  62         RateLimit ratelimit;
  63
  64         usec_t resend_timeout;
  65         usec_t max_rtt;
  66
  67         LIST_HEAD(DnsQueryCandidate, query_candidates);
  68
  69         /* Note that we keep track of ongoing transactions in two
  70          * ways: once in a hashmap, indexed by the rr key, and once in
  71          * a linked list. We use the hashmap to quickly find
  72          * transactions we can reuse for a key. But note that there
  73          * might be multiple transactions for the same key (because
  74          * the zone probing can't reuse a transaction answered from
  75          * the zone or the cache), and the hashmap only tracks the
  76          * most recent entry. */
  77         Hashmap *transactions_by_key;
  78         LIST_HEAD(DnsTransaction, transactions);
  79
  80         LIST_FIELDS(DnsScope, scopes);
  81 };
  82
  83 int dns_scope_new(Manager *m, DnsScope **ret, Link *l, DnsProtocol p, int family);
  84 DnsScope* dns_scope_free(DnsScope *s);
  85
  86 void dns_scope_packet_received(DnsScope *s, usec_t rtt);
  87 void dns_scope_packet_lost(DnsScope *s, usec_t usec);
  88
  89 int dns_scope_emit_udp(DnsScope *s, int fd, DnsPacket *p);
  90 int dns_scope_socket_tcp(DnsScope *s, int family, const union in_addr_union *address, DnsServer *server, uint16_t port);
  91 int dns_scope_socket_udp(DnsScope *s, DnsServer *server, uint16_t port);
  92
  93 DnsScopeMatch dns_scope_good_domain(DnsScope *s, int ifindex, uint64_t flags, const char *domain);
  94 bool dns_scope_good_key(DnsScope *s, const DnsResourceKey *key);
  95
  96 DnsServer *dns_scope_get_dns_server(DnsScope *s);
  97 void dns_scope_next_dns_server(DnsScope *s);
  98
  99 int dns_scope_llmnr_membership(DnsScope *s, bool b);
 100 int dns_scope_mdns_membership(DnsScope *s, bool b);
 101
 102 int dns_scope_make_reply_packet(DnsScope *s, uint16_t id, int rcode, DnsQuestion *q, DnsAnswer *answer, DnsAnswer *soa, bool tentative, DnsPacket **ret);
 103 void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p);
 104
 105 DnsTransaction *dns_scope_find_transaction(DnsScope *scope, DnsResourceKey *key, bool cache_ok);
 106
 107 int dns_scope_notify_conflict(DnsScope *scope, DnsResourceRecord *rr);
 108 void dns_scope_check_conflicts(DnsScope *scope, DnsPacket *p);
 109
 110 void dns_scope_dump(DnsScope *s, FILE *f);
 111
 112 DnsSearchDomain *dns_scope_get_search_domains(DnsScope *s);
 113
 114 bool dns_scope_name_needs_search_domain(DnsScope *s, const char *name);
 115
 116 bool dns_scope_network_good(DnsScope *s);
 117
 118 int dns_scope_ifindex(DnsScope *s);
 119
 120 int dns_scope_announce(DnsScope *scope, bool goodbye);