1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 This file is part of systemd.
7 Copyright 2014 Lennart Poettering
10 #include "in-addr-util.h"
13 #include <gnutls/gnutls.h>
16 typedef struct DnsServer DnsServer
;
18 typedef enum DnsServerType
{
23 #define _DNS_SERVER_TYPE_MAX (DNS_SERVER_LINK + 1)
25 const char* dns_server_type_to_string(DnsServerType i
) _const_
;
26 DnsServerType
dns_server_type_from_string(const char *s
) _pure_
;
28 typedef enum DnsServerFeatureLevel
{
29 DNS_SERVER_FEATURE_LEVEL_TCP
,
30 DNS_SERVER_FEATURE_LEVEL_UDP
,
31 DNS_SERVER_FEATURE_LEVEL_EDNS0
,
32 DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN
,
33 DNS_SERVER_FEATURE_LEVEL_DO
,
34 DNS_SERVER_FEATURE_LEVEL_LARGE
,
35 DNS_SERVER_FEATURE_LEVEL_TLS_DO
,
36 _DNS_SERVER_FEATURE_LEVEL_MAX
,
37 _DNS_SERVER_FEATURE_LEVEL_INVALID
= -1
38 } DnsServerFeatureLevel
;
40 #define DNS_SERVER_FEATURE_LEVEL_WORST 0
41 #define DNS_SERVER_FEATURE_LEVEL_BEST (_DNS_SERVER_FEATURE_LEVEL_MAX - 1)
42 #define DNS_SERVER_FEATURE_LEVEL_IS_TLS(x) IN_SET(x, DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO)
44 const char* dns_server_feature_level_to_string(int i
) _const_
;
45 int dns_server_feature_level_from_string(const char *s
) _pure_
;
47 #include "resolved-link.h"
48 #include "resolved-manager.h"
59 union in_addr_union address
;
60 int ifindex
; /* for IPv6 link-local DNS servers */
66 gnutls_certificate_credentials_t tls_cert_cred
;
67 gnutls_datum_t tls_session_data
;
70 DnsServerFeatureLevel verified_feature_level
;
71 DnsServerFeatureLevel possible_feature_level
;
73 size_t received_udp_packet_max
;
75 unsigned n_failed_udp
;
76 unsigned n_failed_tcp
;
77 unsigned n_failed_tls
;
79 bool packet_truncated
:1;
80 bool packet_bad_opt
:1;
81 bool packet_rrsig_missing
:1;
84 usec_t features_grace_period_usec
;
86 /* Whether we already warned about downgrading to non-DNSSEC mode for this server */
87 bool warned_downgrade
:1;
89 /* Used when GC'ing old DNS servers when configuration changes. */
92 /* If linked is set, then this server appears in the servers linked list */
94 LIST_FIELDS(DnsServer
, servers
);
103 const union in_addr_union
*address
,
106 DnsServer
* dns_server_ref(DnsServer
*s
);
107 DnsServer
* dns_server_unref(DnsServer
*s
);
109 void dns_server_unlink(DnsServer
*s
);
110 void dns_server_move_back_and_unmark(DnsServer
*s
);
112 void dns_server_packet_received(DnsServer
*s
, int protocol
, DnsServerFeatureLevel level
, size_t size
);
113 void dns_server_packet_lost(DnsServer
*s
, int protocol
, DnsServerFeatureLevel level
);
114 void dns_server_packet_truncated(DnsServer
*s
, DnsServerFeatureLevel level
);
115 void dns_server_packet_rrsig_missing(DnsServer
*s
, DnsServerFeatureLevel level
);
116 void dns_server_packet_bad_opt(DnsServer
*s
, DnsServerFeatureLevel level
);
117 void dns_server_packet_rcode_downgrade(DnsServer
*s
, DnsServerFeatureLevel level
);
119 DnsServerFeatureLevel
dns_server_possible_feature_level(DnsServer
*s
);
121 int dns_server_adjust_opt(DnsServer
*server
, DnsPacket
*packet
, DnsServerFeatureLevel level
);
123 const char *dns_server_string(DnsServer
*server
);
124 int dns_server_ifindex(const DnsServer
*s
);
126 bool dns_server_dnssec_supported(DnsServer
*server
);
128 void dns_server_warn_downgrade(DnsServer
*server
);
130 bool dns_server_limited_domains(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 bool dns_server_address_valid(int family
, const union in_addr_union
*sa
);
146 DnssecMode
dns_server_get_dnssec_mode(DnsServer
*s
);
147 PrivateDnsMode
dns_server_get_private_dns_mode(DnsServer
*s
);
149 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer
*, dns_server_unref
);
151 extern const struct hash_ops dns_server_hash_ops
;
153 void dns_server_flush_cache(DnsServer
*s
);
155 void dns_server_reset_features(DnsServer
*s
);
156 void dns_server_reset_features_all(DnsServer
*s
);
158 void dns_server_dump(DnsServer
*s
, FILE *f
);