]>
Commit | Line | Data |
---|---|---|
ec2c5e43 LP |
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 | typedef struct DnsTransaction DnsTransaction; | |
25 | typedef enum DnsTransactionState DnsTransactionState; | |
c3bc53e6 | 26 | typedef enum DnsTransactionSource DnsTransactionSource; |
ec2c5e43 LP |
27 | |
28 | enum DnsTransactionState { | |
29 | DNS_TRANSACTION_NULL, | |
30 | DNS_TRANSACTION_PENDING, | |
31 | DNS_TRANSACTION_FAILURE, | |
32 | DNS_TRANSACTION_SUCCESS, | |
33 | DNS_TRANSACTION_NO_SERVERS, | |
34 | DNS_TRANSACTION_TIMEOUT, | |
35 | DNS_TRANSACTION_ATTEMPTS_MAX_REACHED, | |
36 | DNS_TRANSACTION_INVALID_REPLY, | |
37 | DNS_TRANSACTION_RESOURCES, | |
38 | DNS_TRANSACTION_ABORTED, | |
39 | _DNS_TRANSACTION_STATE_MAX, | |
40 | _DNS_TRANSACTION_STATE_INVALID = -1 | |
41 | }; | |
42 | ||
c3bc53e6 LP |
43 | enum DnsTransactionSource { |
44 | DNS_TRANSACTION_NETWORK, | |
45 | DNS_TRANSACTION_CACHE, | |
46 | DNS_TRANSACTION_ZONE, | |
0d2cd476 | 47 | DNS_TRANSACTION_TRUST_ANCHOR, |
c3bc53e6 LP |
48 | _DNS_TRANSACTION_SOURCE_MAX, |
49 | _DNS_TRANSACTION_SOURCE_INVALID = -1 | |
50 | }; | |
51 | ||
71d35b6b | 52 | #include "resolved-dns-answer.h" |
ec2c5e43 LP |
53 | #include "resolved-dns-packet.h" |
54 | #include "resolved-dns-question.h" | |
71d35b6b | 55 | #include "resolved-dns-scope.h" |
ec2c5e43 LP |
56 | |
57 | struct DnsTransaction { | |
58 | DnsScope *scope; | |
59 | ||
f52e61da | 60 | DnsResourceKey *key; |
ec2c5e43 LP |
61 | |
62 | DnsTransactionState state; | |
63 | uint16_t id; | |
64 | ||
6e068472 LP |
65 | bool initial_jitter; |
66 | ||
ec2c5e43 | 67 | DnsPacket *sent, *received; |
ae6a4bbf LP |
68 | |
69 | DnsAnswer *answer; | |
70 | int answer_rcode; | |
c3bc53e6 | 71 | DnsTransactionSource answer_source; |
ec2c5e43 | 72 | |
9df3ba6c | 73 | usec_t start_usec; |
ec2c5e43 LP |
74 | sd_event_source *timeout_event_source; |
75 | unsigned n_attempts; | |
76 | ||
4667e00a LP |
77 | int dns_udp_fd; |
78 | sd_event_source *dns_udp_event_source; | |
d20b1667 | 79 | |
4667e00a | 80 | /* The active server */ |
8300ba21 TG |
81 | DnsServer *server; |
82 | ||
be808ea0 TG |
83 | /* the features of the DNS server at time of transaction start */ |
84 | DnsServerFeatureLevel current_features; | |
85 | ||
ec2c5e43 LP |
86 | /* TCP connection logic, if we need it */ |
87 | DnsStream *stream; | |
88 | ||
801ad6a6 LP |
89 | /* Query candidates this transaction is referenced by and that |
90 | * shall be notified about this specific transaction | |
91 | * completing. */ | |
92 | Set *query_candidates; | |
ec2c5e43 LP |
93 | |
94 | /* Zone items this transaction is referenced by and that shall | |
95 | * be notified about completion. */ | |
96 | Set *zone_items; | |
97 | ||
98 | unsigned block_gc; | |
99 | ||
100 | LIST_FIELDS(DnsTransaction, transactions_by_scope); | |
101 | }; | |
102 | ||
f52e61da | 103 | int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key); |
ec2c5e43 LP |
104 | DnsTransaction* dns_transaction_free(DnsTransaction *t); |
105 | ||
106 | void dns_transaction_gc(DnsTransaction *t); | |
107 | int dns_transaction_go(DnsTransaction *t); | |
108 | ||
109 | void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p); | |
110 | void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state); | |
111 | ||
112 | const char* dns_transaction_state_to_string(DnsTransactionState p) _const_; | |
113 | DnsTransactionState dns_transaction_state_from_string(const char *s) _pure_; | |
114 | ||
c3bc53e6 LP |
115 | const char* dns_transaction_source_to_string(DnsTransactionSource p) _const_; |
116 | DnsTransactionSource dns_transaction_source_from_string(const char *s) _pure_; | |
117 | ||
ec2c5e43 | 118 | /* LLMNR Jitter interval, see RFC 4795 Section 7 */ |
6e068472 | 119 | #define LLMNR_JITTER_INTERVAL_USEC (100 * USEC_PER_MSEC) |
ec2c5e43 LP |
120 | |
121 | /* Maximum attempts to send DNS requests, across all DNS servers */ | |
3b31df83 | 122 | #define DNS_TRANSACTION_ATTEMPTS_MAX 16 |
ec2c5e43 LP |
123 | |
124 | /* Maximum attempts to send LLMNR requests, see RFC 4795 Section 2.7 */ | |
125 | #define LLMNR_TRANSACTION_ATTEMPTS_MAX 3 | |
126 | ||
c3bc53e6 | 127 | #define TRANSACTION_ATTEMPTS_MAX(p) ((p) == DNS_PROTOCOL_LLMNR ? LLMNR_TRANSACTION_ATTEMPTS_MAX : DNS_TRANSACTION_ATTEMPTS_MAX) |