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 #include <inttypes.h>
  25
  26 #include "sd-bus.h"
  27 #include "util.h"
  28 #include "set.h"
  29
  30 typedef struct DnsQuery DnsQuery;
  31 typedef struct DnsQueryTransaction DnsQueryTransaction;
  32
  33 #include "resolved.h"
  34 #include "resolved-dns-scope.h"
  35 #include "resolved-dns-rr.h"
  36 #include "resolved-dns-packet.h"
  37 #include "resolved-dns-question.h"
  38 #include "resolved-dns-answer.h"
  39 #include "resolved-dns-stream.h"
  40
  41 typedef enum DnsQueryState {
  42         DNS_QUERY_NULL,
  43         DNS_QUERY_PENDING,
  44         DNS_QUERY_FAILURE,
  45         DNS_QUERY_SUCCESS,
  46         DNS_QUERY_NO_SERVERS,
  47         DNS_QUERY_TIMEOUT,
  48         DNS_QUERY_ATTEMPTS_MAX,
  49         DNS_QUERY_INVALID_REPLY,
  50         DNS_QUERY_RESOURCES,
  51         DNS_QUERY_ABORTED,
  52 } DnsQueryState;
  53
  54 struct DnsQueryTransaction {
  55         DnsScope *scope;
  56
  57         DnsQuestion *question;
  58
  59         DnsQueryState state;
  60         uint16_t id;
  61
  62         DnsPacket *sent, *received;
  63         DnsAnswer *cached;
  64         int cached_rcode;
  65
  66         sd_event_source *timeout_event_source;
  67         unsigned n_attempts;
  68
  69         /* TCP connection logic, if we need it */
  70         DnsStream *stream;
  71
  72         /* Queries this transaction is referenced by and that shall by
  73          * notified about this specific transaction completing. */
  74         Set *queries;
  75
  76         unsigned block_gc;
  77
  78         LIST_FIELDS(DnsQueryTransaction, transactions_by_scope);
  79 };
  80
  81 struct DnsQuery {
  82         Manager *manager;
  83         DnsQuestion *question;
  84
  85         DnsQueryState state;
  86         unsigned n_cname_redirects;
  87
  88         sd_event_source *timeout_event_source;
  89
  90         /* Discovered data */
  91         DnsAnswer *answer;
  92         int answer_ifindex;
  93         int answer_rcode;
  94
  95         /* Bus client information */
  96         sd_bus_message *request;
  97         int request_family;
  98         const char *request_hostname;
  99         union in_addr_union request_address;
 100
 101         /* Completion callback */
 102         void (*complete)(DnsQuery* q);
 103         unsigned block_ready;
 104
 105         Set *transactions;
 106
 107         LIST_FIELDS(DnsQuery, queries);
 108 };
 109
 110 DnsQueryTransaction* dns_query_transaction_free(DnsQueryTransaction *t);
 111 void dns_query_transaction_complete(DnsQueryTransaction *t, DnsQueryState state);
 112
 113 void dns_query_transaction_process_reply(DnsQueryTransaction *t, DnsPacket *p);
 114
 115 int dns_query_new(Manager *m, DnsQuery **q, DnsQuestion *question);
 116 DnsQuery *dns_query_free(DnsQuery *q);
 117
 118 int dns_query_go(DnsQuery *q);
 119 void dns_query_ready(DnsQuery *q);
 120
 121 int dns_query_cname_redirect(DnsQuery *q, const char *name);
 122
 123 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);