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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; | |
26 | ||
27 | enum DnsTransactionState { | |
28 | DNS_TRANSACTION_NULL, | |
29 | DNS_TRANSACTION_PENDING, | |
30 | DNS_TRANSACTION_FAILURE, | |
31 | DNS_TRANSACTION_SUCCESS, | |
32 | DNS_TRANSACTION_NO_SERVERS, | |
33 | DNS_TRANSACTION_TIMEOUT, | |
34 | DNS_TRANSACTION_ATTEMPTS_MAX_REACHED, | |
35 | DNS_TRANSACTION_INVALID_REPLY, | |
36 | DNS_TRANSACTION_RESOURCES, | |
37 | DNS_TRANSACTION_ABORTED, | |
38 | _DNS_TRANSACTION_STATE_MAX, | |
39 | _DNS_TRANSACTION_STATE_INVALID = -1 | |
40 | }; | |
41 | ||
42 | #include "resolved-dns-scope.h" | |
43 | #include "resolved-dns-rr.h" | |
44 | #include "resolved-dns-packet.h" | |
45 | #include "resolved-dns-question.h" | |
46 | #include "resolved-dns-answer.h" | |
47 | #include "resolved-dns-stream.h" | |
48 | ||
49 | struct DnsTransaction { | |
50 | DnsScope *scope; | |
51 | ||
52 | DnsQuestion *question; | |
53 | ||
54 | DnsTransactionState state; | |
55 | uint16_t id; | |
56 | ||
6e068472 LP |
57 | bool initial_jitter; |
58 | ||
ec2c5e43 LP |
59 | DnsPacket *sent, *received; |
60 | DnsAnswer *cached; | |
61 | int cached_rcode; | |
62 | ||
63 | sd_event_source *timeout_event_source; | |
64 | unsigned n_attempts; | |
65 | ||
66 | /* TCP connection logic, if we need it */ | |
67 | DnsStream *stream; | |
68 | ||
69 | /* Queries this transaction is referenced by and that shall be | |
70 | * notified about this specific transaction completing. */ | |
71 | Set *queries; | |
72 | ||
73 | /* Zone items this transaction is referenced by and that shall | |
74 | * be notified about completion. */ | |
75 | Set *zone_items; | |
76 | ||
77 | unsigned block_gc; | |
78 | ||
79 | LIST_FIELDS(DnsTransaction, transactions_by_scope); | |
80 | }; | |
81 | ||
82 | int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsQuestion *q); | |
83 | DnsTransaction* dns_transaction_free(DnsTransaction *t); | |
84 | ||
85 | void dns_transaction_gc(DnsTransaction *t); | |
86 | int dns_transaction_go(DnsTransaction *t); | |
87 | ||
88 | void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p); | |
89 | void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state); | |
90 | ||
91 | const char* dns_transaction_state_to_string(DnsTransactionState p) _const_; | |
92 | DnsTransactionState dns_transaction_state_from_string(const char *s) _pure_; | |
93 | ||
94 | /* After how much time to repeat classic DNS requests */ | |
95 | #define DNS_TRANSACTION_TIMEOUT_USEC (5 * USEC_PER_SEC) | |
96 | ||
97 | /* After how much time to repeat LLMNR requests, see RFC 4795 Section 7 */ | |
98 | #define LLMNR_TRANSACTION_TIMEOUT_USEC (1 * USEC_PER_SEC) | |
99 | ||
100 | /* LLMNR Jitter interval, see RFC 4795 Section 7 */ | |
6e068472 | 101 | #define LLMNR_JITTER_INTERVAL_USEC (100 * USEC_PER_MSEC) |
ec2c5e43 LP |
102 | |
103 | /* Maximum attempts to send DNS requests, across all DNS servers */ | |
104 | #define DNS_TRANSACTION_ATTEMPTS_MAX 8 | |
105 | ||
106 | /* Maximum attempts to send LLMNR requests, see RFC 4795 Section 2.7 */ | |
107 | #define LLMNR_TRANSACTION_ATTEMPTS_MAX 3 | |
108 | ||
109 | #define TRANSACTION_TIMEOUT_USEC(p) (p == DNS_PROTOCOL_LLMNR ? LLMNR_TRANSACTION_TIMEOUT_USEC : DNS_TRANSACTION_TIMEOUT_USEC) | |
110 | #define TRANSACTION_ATTEMPTS_MAX(p) (p == DNS_PROTOCOL_LLMNR ? LLMNR_TRANSACTION_ATTEMPTS_MAX : DNS_TRANSACTION_ATTEMPTS_MAX) |