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#pragma once
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <systemd/sd-bus.h>
#include "basic-dns/resolved-dns-answer.h"
#include "basic-dns/resolved-dns-question.h"
#include "systemd-basic/set.h"
typedef struct DnsQuery DnsQuery;
typedef struct DnsQueryCandidate DnsQueryCandidate;
#include "resolved-dns-search-domain.h"
#include "resolved-dns-stream.h"
struct DnsQueryCandidate {
DnsQuery *query;
DnsScope *scope;
DnsSearchDomain *search_domain;
int error_code;
Set *transactions;
LIST_FIELDS(DnsQueryCandidate, candidates_by_query);
LIST_FIELDS(DnsQueryCandidate, candidates_by_scope);
};
struct DnsQuery {
Manager *manager;
/* When resolving a service, we first create a TXT+SRV query,
* and then for the hostnames we discover auxiliary A+AAAA
* queries. This pointer always points from the auxiliary
* queries back to the TXT+SRV query. */
DnsQuery *auxiliary_for;
LIST_HEAD(DnsQuery, auxiliary_queries);
unsigned n_auxiliary_queries;
int auxiliary_result;
/* The question, formatted in IDNA for use on classic DNS, and as UTF8 for use in LLMNR or mDNS. Note that even
* on classic DNS some labels might use UTF8 encoding. Specifically, DNS-SD service names (in contrast to their
* domain suffixes) use UTF-8 encoding even on DNS. Thus, the difference between these two fields is mostly
* relevant only for explicit *hostname* lookups as well as the domain suffixes of service lookups. */
DnsQuestion *question_idna;
DnsQuestion *question_utf8;
uint64_t flags;
int ifindex;
/* If true, A or AAAA RR lookups will be suppressed on links with no routable address of the matching address
* family */
bool suppress_unroutable_family;
/* If true, the RR TTLs of the answer will be clamped by their current left validity in the cache */
bool clamp_ttl;
DnsTransactionState state;
unsigned n_cname_redirects;
LIST_HEAD(DnsQueryCandidate, candidates);
sd_event_source *timeout_event_source;
/* Discovered data */
DnsAnswer *answer;
int answer_rcode;
DnssecResult answer_dnssec_result;
bool answer_authenticated;
DnsProtocol answer_protocol;
int answer_family;
DnsSearchDomain *answer_search_domain;
int answer_errno; /* if state is DNS_TRANSACTION_ERRNO */
/* Bus client information */
sd_bus_message *request;
int request_family;
bool request_address_valid;
union in_addr_union request_address;
unsigned block_all_complete;
char *request_address_string;
/* DNS stub information */
DnsPacket *request_dns_packet;
DnsStream *request_dns_stream;
/* Completion callback */
void (*complete)(DnsQuery* q);
unsigned block_ready;
sd_bus_track *bus_track;
LIST_FIELDS(DnsQuery, queries);
LIST_FIELDS(DnsQuery, auxiliary_queries);
};
enum {
DNS_QUERY_MATCH,
DNS_QUERY_NOMATCH,
DNS_QUERY_RESTARTED,
};
DnsQueryCandidate* dns_query_candidate_free(DnsQueryCandidate *c);
void dns_query_candidate_notify(DnsQueryCandidate *c);
int dns_query_new(Manager *m, DnsQuery **q, DnsQuestion *question_utf8, DnsQuestion *question_idna, int family, uint64_t flags);
DnsQuery *dns_query_free(DnsQuery *q);
int dns_query_make_auxiliary(DnsQuery *q, DnsQuery *auxiliary_for);
int dns_query_go(DnsQuery *q);
void dns_query_ready(DnsQuery *q);
int dns_query_process_cname(DnsQuery *q);
int dns_query_bus_track(DnsQuery *q, sd_bus_message *m);
DnsQuestion* dns_query_question_for_protocol(DnsQuery *q, DnsProtocol protocol);
const char *dns_query_string(DnsQuery *q);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);
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