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
  29 typedef struct DnsQuery DnsQuery;
  30 typedef struct DnsQueryTransaction DnsQueryTransaction;
  31
  32 #include "resolved.h"
  33 #include "resolved-dns-scope.h"
  34 #include "resolved-dns-rr.h"
  35 #include "resolved-dns-packet.h"
  36
  37 typedef enum DnsQueryState {
  38         DNS_QUERY_NULL,
  39         DNS_QUERY_SENT,
  40         DNS_QUERY_FAILURE,
  41         DNS_QUERY_SUCCESS,
  42         DNS_QUERY_NO_SERVERS,
  43         DNS_QUERY_TIMEOUT,
  44         DNS_QUERY_ATTEMPTS_MAX,
  45         DNS_QUERY_INVALID_REPLY,
  46         DNS_QUERY_RESOURCES,
  47 } DnsQueryState;
  48
  49 struct DnsQueryTransaction {
  50         DnsQuery *query;
  51         DnsScope *scope;
  52
  53         DnsQueryState state;
  54         uint16_t id;
  55
  56         sd_event_source *timeout_event_source;
  57         unsigned n_attempts;
  58
  59         DnsPacket *sent, *received;
  60
  61         /* TCP connection logic */
  62         int tcp_fd;
  63         sd_event_source *tcp_event_source;
  64         size_t tcp_written, tcp_read;
  65         be16_t tcp_read_size;
  66
  67         LIST_FIELDS(DnsQueryTransaction, transactions_by_query);
  68         LIST_FIELDS(DnsQueryTransaction, transactions_by_scope);
  69 };
  70
  71 struct DnsQuery {
  72         Manager *manager;
  73
  74         DnsResourceKey *keys;
  75         unsigned n_keys;
  76
  77         DnsQueryState state;
  78
  79         sd_event_source *timeout_event_source;
  80
  81         DnsPacket *received;
  82
  83         sd_bus_message *request;
  84         unsigned char request_family;
  85         const char *request_hostname;
  86         union in_addr_union request_address;
  87
  88         void (*complete)(DnsQuery* q);
  89
  90         LIST_HEAD(DnsQueryTransaction, transactions);
  91         LIST_FIELDS(DnsQuery, queries);
  92 };
  93
  94 int dns_query_new(Manager *m, DnsQuery **q, DnsResourceKey *keys, unsigned n_keys);
  95 DnsQuery *dns_query_free(DnsQuery *q);
  96 int dns_query_start(DnsQuery *q);
  97 void dns_query_finish(DnsQuery *q);
  98
  99 DnsQueryTransaction* dns_query_transaction_free(DnsQueryTransaction *t);
 100 int dns_query_transaction_start(DnsQueryTransaction *t);
 101 void dns_query_transaction_reply(DnsQueryTransaction *t, DnsPacket *p);
 102
 103 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);