1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 This file is part of systemd.
7 Copyright 2014 Lennart Poettering
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.
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.
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/>.
28 typedef struct DnsQueryCandidate DnsQueryCandidate
;
29 typedef struct DnsQuery DnsQuery
;
31 #include "resolved-dns-answer.h"
32 #include "resolved-dns-question.h"
33 #include "resolved-dns-stream.h"
34 #include "resolved-dns-search-domain.h"
36 struct DnsQueryCandidate
{
40 DnsSearchDomain
*search_domain
;
45 LIST_FIELDS(DnsQueryCandidate
, candidates_by_query
);
46 LIST_FIELDS(DnsQueryCandidate
, candidates_by_scope
);
52 /* When resolving a service, we first create a TXT+SRV query,
53 * and then for the hostnames we discover auxiliary A+AAAA
54 * queries. This pointer always points from the auxiliary
55 * queries back to the TXT+SRV query. */
56 DnsQuery
*auxiliary_for
;
57 LIST_HEAD(DnsQuery
, auxiliary_queries
);
58 unsigned n_auxiliary_queries
;
61 /* The question, formatted in IDNA for use on classic DNS, and as UTF8 for use in LLMNR or mDNS. Note that even
62 * on classic DNS some labels might use UTF8 encoding. Specifically, DNS-SD service names (in contrast to their
63 * domain suffixes) use UTF-8 encoding even on DNS. Thus, the difference between these two fields is mostly
64 * relevant only for explicit *hostname* lookups as well as the domain suffixes of service lookups. */
65 DnsQuestion
*question_idna
;
66 DnsQuestion
*question_utf8
;
71 /* If true, A or AAAA RR lookups will be suppressed on links with no routable address of the matching address
73 bool suppress_unroutable_family
;
75 /* If true, the RR TTLs of the answer will be clamped by their current left validity in the cache */
78 DnsTransactionState state
;
79 unsigned n_cname_redirects
;
81 LIST_HEAD(DnsQueryCandidate
, candidates
);
82 sd_event_source
*timeout_event_source
;
87 DnssecResult answer_dnssec_result
;
88 bool answer_authenticated
;
89 DnsProtocol answer_protocol
;
91 DnsSearchDomain
*answer_search_domain
;
92 int answer_errno
; /* if state is DNS_TRANSACTION_ERRNO */
93 bool previous_redirect_unauthenticated
;
95 /* Bus client information */
96 sd_bus_message
*request
;
98 bool request_address_valid
;
99 union in_addr_union request_address
;
100 unsigned block_all_complete
;
101 char *request_address_string
;
103 /* DNS stub information */
104 DnsPacket
*request_dns_packet
;
105 DnsStream
*request_dns_stream
;
106 DnsPacket
*reply_dns_packet
;
108 /* Completion callback */
109 void (*complete
)(DnsQuery
* q
);
110 unsigned block_ready
;
112 sd_bus_track
*bus_track
;
114 LIST_FIELDS(DnsQuery
, queries
);
115 LIST_FIELDS(DnsQuery
, auxiliary_queries
);
124 DnsQueryCandidate
* dns_query_candidate_free(DnsQueryCandidate
*c
);
125 void dns_query_candidate_notify(DnsQueryCandidate
*c
);
127 int dns_query_new(Manager
*m
, DnsQuery
**q
, DnsQuestion
*question_utf8
, DnsQuestion
*question_idna
, int family
, uint64_t flags
);
128 DnsQuery
*dns_query_free(DnsQuery
*q
);
130 int dns_query_make_auxiliary(DnsQuery
*q
, DnsQuery
*auxiliary_for
);
132 int dns_query_go(DnsQuery
*q
);
133 void dns_query_ready(DnsQuery
*q
);
135 int dns_query_process_cname(DnsQuery
*q
);
137 int dns_query_bus_track(DnsQuery
*q
, sd_bus_message
*m
);
139 DnsQuestion
* dns_query_question_for_protocol(DnsQuery
*q
, DnsProtocol protocol
);
141 const char *dns_query_string(DnsQuery
*q
);
143 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery
*, dns_query_free
);
145 bool dns_query_fully_authenticated(DnsQuery
*q
);