0354029bf5
DnsPacket should better be a "dead" object, i.e. list facts, not track resources. By including an fd in its fields it started tracking resources however, without actually taking a ref to the fd (i.e. no dup() or so was called on it). Let's hence rework things so that we don#t have to keep track of the fd a packet came in from. Instead, pass around the DnsStubListenerExtra object wherever we need to. This should be useful as soon as we start caching whole DnsPacket objects to allow replying to DNSSEC/CO packets, i.e. where we have to keep a copy of the original DnsPacket around for a long time in cache, potentially much longer than the fds the packet was received on.
128 lines
4 KiB
C
128 lines
4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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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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