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         /* The question, formatted in IDNA for use on classic DNS, and as UTF8 for use in LLMNR or mDNS. Note that even
  63          * on classic DNS some labels might use UTF8 encoding. Specifically, DNS-SD service names (in contrast to their
  64          * domain suffixes) use UTF-8 encoding even on DNS. Thus, the difference between these two fields is mostly
  65          * relevant only for explicit *hostname* lookups as well as the domain suffixes of service lookups. */
  66         DnsQuestion *question_idna;
  67         DnsQuestion *question_utf8;
  68
  69         uint64_t flags;
  70         int ifindex;
  71
  72         /* If true, A or AAAA RR lookups will be suppressed on links with no routable address of the matching address
  73          * family */
  74         bool suppress_unroutable_family;
  75
  76         DnsTransactionState state;
  77         unsigned n_cname_redirects;
  78
  79         LIST_HEAD(DnsQueryCandidate, candidates);
  80         sd_event_source *timeout_event_source;
  81
  82         /* Discovered data */
  83         DnsAnswer *answer;
  84         int answer_rcode;
  85         DnssecResult answer_dnssec_result;
  86         bool answer_authenticated;
  87         DnsProtocol answer_protocol;
  88         int answer_family;
  89         DnsSearchDomain *answer_search_domain;
  90         int answer_errno; /* if state is DNS_TRANSACTION_ERRNO */
  91
  92         /* Bus client information */
  93         sd_bus_message *request;
  94         int request_family;
  95         bool request_address_valid;
  96         union in_addr_union request_address;
  97         unsigned block_all_complete;
  98         char *request_address_string;
  99
 100         /* Completion callback */
 101         void (*complete)(DnsQuery* q);
 102         unsigned block_ready;
 103
 104         sd_bus_track *bus_track;
 105
 106         LIST_FIELDS(DnsQuery, queries);
 107         LIST_FIELDS(DnsQuery, auxiliary_queries);
 108 };
 109
 110 enum {
 111         DNS_QUERY_MATCH,
 112         DNS_QUERY_NOMATCH,
 113         DNS_QUERY_RESTARTED,
 114 };
 115
 116 DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c);
 117 void dns_query_candidate_notify(DnsQueryCandidate *c);
 118
 119 int dns_query_new(Manager *m, DnsQuery **q, DnsQuestion *question_utf8, DnsQuestion *question_idna, int family, uint64_t flags);
 120 DnsQuery *dns_query_free(DnsQuery *q);
 121
 122 int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for);
 123
 124 int dns_query_go(DnsQuery *q);
 125 void dns_query_ready(DnsQuery *q);
 126
 127 int dns_query_process_cname(DnsQuery *q);
 128
 129 int dns_query_bus_track(DnsQuery *q, sd_bus_message *m);
 130
 131 DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol);
 132
 133 const char *dns_query_string(DnsQuery *q);
 134
 135 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);