src/resolve/resolved-dns-query.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2014 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24
  25 #include "sd-bus.h"
  26
  27 #include "set.h"
  28
  29 typedef struct DnsQueryCandidate DnsQueryCandidate;
  30 typedef struct DnsQuery DnsQuery;
  31
  32 #include "resolved-dns-answer.h"
  33 #include "resolved-dns-question.h"
  34 #include "resolved-dns-stream.h"
  35 #include "resolved-dns-search-domain.h"
  36
  37 struct DnsQueryCandidate {
  38         DnsQuery *query;
  39         DnsScope *scope;
  40
  41         DnsSearchDomain *search_domain;
  42
  43         int error_code;
  44         Set *transactions;
  45
  46         LIST_FIELDS(DnsQueryCandidate, candidates_by_query);
  47         LIST_FIELDS(DnsQueryCandidate, candidates_by_scope);
  48 };
  49
  50 struct DnsQuery {
  51         Manager *manager;
  52
  53         /* When resolving a service, we first create a TXT+SRV query,
  54          * and then for the hostnames we discover auxiliary A+AAAA
  55          * queries. This pointer always points from the auxiliary
  56          * queries back to the TXT+SRV query. */
  57         DnsQuery *auxiliary_for;
  58         LIST_HEAD(DnsQuery, auxiliary_queries);
  59         unsigned n_auxiliary_queries;
  60         int auxiliary_result;
  61
  62         DnsQuestion *question;
  63         uint64_t flags;
  64         int ifindex;
  65
  66         DnsTransactionState state;
  67         unsigned n_cname_redirects;
  68
  69         LIST_HEAD(DnsQueryCandidate, candidates);
  70         sd_event_source *timeout_event_source;
  71
  72         /* Discovered data */
  73         DnsAnswer *answer;
  74         int answer_rcode;
  75         DnssecResult answer_dnssec_result;
  76         bool answer_authenticated;
  77         DnsProtocol answer_protocol;
  78         int answer_family;
  79         DnsSearchDomain *answer_search_domain;
  80
  81         /* Bus client information */
  82         sd_bus_message *request;
  83         int request_family;
  84         bool request_address_valid;
  85         union in_addr_union request_address;
  86         unsigned block_all_complete;
  87
  88         /* Completion callback */
  89         void (*complete)(DnsQuery* q);
  90         unsigned block_ready;
  91
  92         sd_bus_track *bus_track;
  93
  94         LIST_FIELDS(DnsQuery, queries);
  95         LIST_FIELDS(DnsQuery, auxiliary_queries);
  96 };
  97
  98 enum {
  99         DNS_QUERY_MATCH,
 100         DNS_QUERY_NOMATCH,
 101         DNS_QUERY_RESTARTED,
 102 };
 103
 104 DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c);
 105 void dns_query_candidate_notify(DnsQueryCandidate *c);
 106
 107 int dns_query_new(Manager *m, DnsQuery **q, DnsQuestion *question, int family, uint64_t flags);
 108 DnsQuery *dns_query_free(DnsQuery *q);
 109
 110 int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for);
 111
 112 int dns_query_go(DnsQuery *q);
 113 void dns_query_ready(DnsQuery *q);
 114
 115 int dns_query_process_cname(DnsQuery *q);
 116
 117 int dns_query_bus_track(DnsQuery *q, sd_bus_message *m);
 118
 119 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);