4 This file is part of systemd.
6 Copyright 2014 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include "in-addr-util.h"
24 typedef struct DnsServer DnsServer
;
26 typedef enum DnsServerType
{
31 #define _DNS_SERVER_TYPE_MAX (DNS_SERVER_LINK + 1)
33 const char* dns_server_type_to_string(DnsServerType i
) _const_
;
34 DnsServerType
dns_server_type_from_string(const char *s
) _pure_
;
36 typedef enum DnsServerFeatureLevel
{
37 DNS_SERVER_FEATURE_LEVEL_TCP
,
38 DNS_SERVER_FEATURE_LEVEL_UDP
,
39 DNS_SERVER_FEATURE_LEVEL_EDNS0
,
40 DNS_SERVER_FEATURE_LEVEL_DO
,
41 DNS_SERVER_FEATURE_LEVEL_LARGE
,
42 _DNS_SERVER_FEATURE_LEVEL_MAX
,
43 _DNS_SERVER_FEATURE_LEVEL_INVALID
= -1
44 } DnsServerFeatureLevel
;
46 #define DNS_SERVER_FEATURE_LEVEL_WORST 0
47 #define DNS_SERVER_FEATURE_LEVEL_BEST (_DNS_SERVER_FEATURE_LEVEL_MAX - 1)
49 const char* dns_server_feature_level_to_string(int i
) _const_
;
50 int dns_server_feature_level_from_string(const char *s
) _pure_
;
52 #include "resolved-link.h"
53 #include "resolved-manager.h"
64 union in_addr_union address
;
65 int ifindex
; /* for IPv6 link-local DNS servers */
69 usec_t resend_timeout
;
72 DnsServerFeatureLevel verified_feature_level
;
73 DnsServerFeatureLevel possible_feature_level
;
75 size_t received_udp_packet_max
;
77 unsigned n_failed_udp
;
78 unsigned n_failed_tcp
;
81 bool packet_truncated
:1;
82 bool packet_bad_opt
:1;
83 bool packet_rrsig_missing
:1;
86 usec_t features_grace_period_usec
;
88 /* Whether we already warned about downgrading to non-DNSSEC mode for this server */
89 bool warned_downgrade
:1;
91 /* Used when GC'ing old DNS servers when configuration changes. */
94 /* If linked is set, then this server appears in the servers linked list */
96 LIST_FIELDS(DnsServer
, servers
);
105 const union in_addr_union
*address
,
108 DnsServer
* dns_server_ref(DnsServer
*s
);
109 DnsServer
* dns_server_unref(DnsServer
*s
);
111 void dns_server_unlink(DnsServer
*s
);
112 void dns_server_move_back_and_unmark(DnsServer
*s
);
114 void dns_server_packet_received(DnsServer
*s
, int protocol
, DnsServerFeatureLevel level
, usec_t rtt
, size_t size
);
115 void dns_server_packet_lost(DnsServer
*s
, int protocol
, DnsServerFeatureLevel level
, usec_t usec
);
116 void dns_server_packet_failed(DnsServer
*s
, DnsServerFeatureLevel level
);
117 void dns_server_packet_truncated(DnsServer
*s
, DnsServerFeatureLevel level
);
118 void dns_server_packet_rrsig_missing(DnsServer
*s
, DnsServerFeatureLevel level
);
119 void dns_server_packet_bad_opt(DnsServer
*s
, DnsServerFeatureLevel level
);
121 DnsServerFeatureLevel
dns_server_possible_feature_level(DnsServer
*s
);
123 int dns_server_adjust_opt(DnsServer
*server
, DnsPacket
*packet
, DnsServerFeatureLevel level
);
125 const char *dns_server_string(DnsServer
*server
);
126 int dns_server_ifindex(const DnsServer
*s
);
128 bool dns_server_dnssec_supported(DnsServer
*server
);
130 void dns_server_warn_downgrade(DnsServer
*server
);
132 DnsServer
*dns_server_find(DnsServer
*first
, int family
, const union in_addr_union
*in_addr
, int ifindex
);
134 void dns_server_unlink_all(DnsServer
*first
);
135 void dns_server_unlink_marked(DnsServer
*first
);
136 void dns_server_mark_all(DnsServer
*first
);
138 DnsServer
*manager_get_first_dns_server(Manager
*m
, DnsServerType t
);
140 DnsServer
*manager_set_dns_server(Manager
*m
, DnsServer
*s
);
141 DnsServer
*manager_get_dns_server(Manager
*m
);
142 void manager_next_dns_server(Manager
*m
);
144 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer
*, dns_server_unref
);
146 extern const struct hash_ops dns_server_hash_ops
;