128 lines
4 KiB
C
128 lines
4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "sd-bus.h"
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#include "set.h"
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#include "varlink.h"
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typedef struct DnsQueryCandidate DnsQueryCandidate;
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typedef struct DnsQuery DnsQuery;
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typedef struct DnsStubListenerExtra DnsStubListenerExtra;
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#include "resolved-dns-answer.h"
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#include "resolved-dns-question.h"
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#include "resolved-dns-search-domain.h"
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#include "resolved-dns-transaction.h"
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struct DnsQueryCandidate {
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DnsQuery *query;
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DnsScope *scope;
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DnsSearchDomain *search_domain;
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int error_code;
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Set *transactions;
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LIST_FIELDS(DnsQueryCandidate, candidates_by_query);
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LIST_FIELDS(DnsQueryCandidate, candidates_by_scope);
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};
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struct DnsQuery {
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Manager *manager;
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/* When resolving a service, we first create a TXT+SRV query,
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* and then for the hostnames we discover auxiliary A+AAAA
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* queries. This pointer always points from the auxiliary
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* queries back to the TXT+SRV query. */
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DnsQuery *auxiliary_for;
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LIST_HEAD(DnsQuery, auxiliary_queries);
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unsigned n_auxiliary_queries;
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int auxiliary_result;
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/* The question, formatted in IDNA for use on classic DNS, and as UTF8 for use in LLMNR or mDNS. Note that even
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* on classic DNS some labels might use UTF8 encoding. Specifically, DNS-SD service names (in contrast to their
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* domain suffixes) use UTF-8 encoding even on DNS. Thus, the difference between these two fields is mostly
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* relevant only for explicit *hostname* lookups as well as the domain suffixes of service lookups. */
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DnsQuestion *question_idna;
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DnsQuestion *question_utf8;
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uint64_t flags;
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int ifindex;
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/* If true, the RR TTLs of the answer will be clamped by their current left validity in the cache */
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bool clamp_ttl;
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DnsTransactionState state;
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unsigned n_cname_redirects;
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LIST_HEAD(DnsQueryCandidate, candidates);
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sd_event_source *timeout_event_source;
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/* Discovered data */
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DnsAnswer *answer;
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int answer_rcode;
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DnssecResult answer_dnssec_result;
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bool answer_authenticated;
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DnsProtocol answer_protocol;
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int answer_family;
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DnsSearchDomain *answer_search_domain;
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int answer_errno; /* if state is DNS_TRANSACTION_ERRNO */
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bool previous_redirect_unauthenticated;
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/* Bus + Varlink client information */
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sd_bus_message *bus_request;
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Varlink *varlink_request;
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int request_family;
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bool request_address_valid;
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union in_addr_union request_address;
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unsigned block_all_complete;
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char *request_address_string;
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/* DNS stub information */
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DnsPacket *request_dns_packet;
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DnsStream *request_dns_stream;
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DnsPacket *reply_dns_packet;
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DnsStubListenerExtra *stub_listener_extra;
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/* Completion callback */
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void (*complete)(DnsQuery* q);
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unsigned block_ready;
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sd_bus_track *bus_track;
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LIST_FIELDS(DnsQuery, queries);
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LIST_FIELDS(DnsQuery, auxiliary_queries);
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};
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enum {
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DNS_QUERY_MATCH,
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DNS_QUERY_NOMATCH,
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DNS_QUERY_RESTARTED,
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};
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DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c);
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQueryCandidate*, dns_query_candidate_free);
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void dns_query_candidate_notify(DnsQueryCandidate *c);
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int dns_query_new(Manager *m, DnsQuery **q, DnsQuestion *question_utf8, DnsQuestion *question_idna, int family, uint64_t flags);
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DnsQuery *dns_query_free(DnsQuery *q);
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int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for);
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int dns_query_go(DnsQuery *q);
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void dns_query_ready(DnsQuery *q);
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int dns_query_process_cname(DnsQuery *q);
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void dns_query_complete(DnsQuery *q, DnsTransactionState state);
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DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol);
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const char *dns_query_string(DnsQuery *q);
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);
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bool dns_query_fully_authenticated(DnsQuery *q);
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