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_PENDING,
  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         unsigned n_cname;
  79
  80         sd_event_source *timeout_event_source;
  81
  82         DnsPacket *received;
  83
  84         /* Bus client information */
  85         sd_bus_message *request;
  86         unsigned char request_family;
  87         const char *request_hostname;
  88         union in_addr_union request_address;
  89
  90         void (*complete)(DnsQuery* q);
  91
  92         LIST_HEAD(DnsQueryTransaction, transactions);
  93         LIST_FIELDS(DnsQuery, queries);
  94 };
  95
  96 int dns_query_new(Manager *m, DnsQuery **q, DnsResourceKey *keys, unsigned n_keys);
  97 DnsQuery *dns_query_free(DnsQuery *q);
  98 int dns_query_start(DnsQuery *q);
  99 int dns_query_follow_cname(DnsQuery *q, const char *name);
 100 int dns_query_matches_rr(DnsQuery *q, DnsResourceRecord *rr);
 101 int dns_query_matches_cname(DnsQuery *q, DnsResourceRecord *rr);
 102
 103 DnsQueryTransaction* dns_query_transaction_free(DnsQueryTransaction *t);
 104 void dns_query_transaction_reply(DnsQueryTransaction *t, DnsPacket *p);
 105 void dns_query_finish(DnsQuery *q);
 106
 107 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuery*, dns_query_free);