1 /* SPDX-License-Identifier: LGPL-2.1+ */
4 #include "in-addr-util.h"
6 typedef struct DnsServer DnsServer
;
8 typedef enum DnsServerType
{
13 _DNS_SERVER_TYPE_INVALID
= -1
16 const char* dns_server_type_to_string(DnsServerType i
) _const_
;
17 DnsServerType
dns_server_type_from_string(const char *s
) _pure_
;
19 typedef enum DnsServerFeatureLevel
{
20 DNS_SERVER_FEATURE_LEVEL_TCP
,
21 DNS_SERVER_FEATURE_LEVEL_UDP
,
22 DNS_SERVER_FEATURE_LEVEL_EDNS0
,
23 DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN
,
24 DNS_SERVER_FEATURE_LEVEL_DO
,
25 DNS_SERVER_FEATURE_LEVEL_LARGE
,
26 DNS_SERVER_FEATURE_LEVEL_TLS_DO
,
27 _DNS_SERVER_FEATURE_LEVEL_MAX
,
28 _DNS_SERVER_FEATURE_LEVEL_INVALID
= -1
29 } DnsServerFeatureLevel
;
31 #define DNS_SERVER_FEATURE_LEVEL_WORST 0
32 #define DNS_SERVER_FEATURE_LEVEL_BEST (_DNS_SERVER_FEATURE_LEVEL_MAX - 1)
33 #define DNS_SERVER_FEATURE_LEVEL_IS_TLS(x) IN_SET(x, DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO)
35 const char* dns_server_feature_level_to_string(int i
) _const_
;
36 int dns_server_feature_level_from_string(const char *s
) _pure_
;
38 #include "resolved-dnstls.h"
39 #include "resolved-link.h"
40 #include "resolved-manager.h"
51 union in_addr_union address
;
52 int ifindex
; /* for IPv6 link-local DNS servers */
56 /* The long-lived stream towards this server. */
59 #if ENABLE_DNS_OVER_TLS
60 DnsTlsServerData dnstls_data
;
63 DnsServerFeatureLevel verified_feature_level
;
64 DnsServerFeatureLevel possible_feature_level
;
66 size_t received_udp_packet_max
;
68 unsigned n_failed_udp
;
69 unsigned n_failed_tcp
;
70 unsigned n_failed_tls
;
72 bool packet_truncated
:1;
73 bool packet_bad_opt
:1;
74 bool packet_rrsig_missing
:1;
77 usec_t features_grace_period_usec
;
79 /* Whether we already warned about downgrading to non-DNSSEC mode for this server */
80 bool warned_downgrade
:1;
82 /* Used when GC'ing old DNS servers when configuration changes. */
85 /* If linked is set, then this server appears in the servers linked list */
87 LIST_FIELDS(DnsServer
, servers
);
96 const union in_addr_union
*address
,
99 DnsServer
* dns_server_ref(DnsServer
*s
);
100 DnsServer
* dns_server_unref(DnsServer
*s
);
102 void dns_server_unlink(DnsServer
*s
);
103 void dns_server_move_back_and_unmark(DnsServer
*s
);
105 void dns_server_packet_received(DnsServer
*s
, int protocol
, DnsServerFeatureLevel level
, size_t size
);
106 void dns_server_packet_lost(DnsServer
*s
, int protocol
, DnsServerFeatureLevel level
);
107 void dns_server_packet_truncated(DnsServer
*s
, DnsServerFeatureLevel level
);
108 void dns_server_packet_rrsig_missing(DnsServer
*s
, DnsServerFeatureLevel level
);
109 void dns_server_packet_bad_opt(DnsServer
*s
, DnsServerFeatureLevel level
);
110 void dns_server_packet_rcode_downgrade(DnsServer
*s
, DnsServerFeatureLevel level
);
112 DnsServerFeatureLevel
dns_server_possible_feature_level(DnsServer
*s
);
114 int dns_server_adjust_opt(DnsServer
*server
, DnsPacket
*packet
, DnsServerFeatureLevel level
);
116 const char *dns_server_string(DnsServer
*server
);
117 int dns_server_ifindex(const DnsServer
*s
);
119 bool dns_server_dnssec_supported(DnsServer
*server
);
121 void dns_server_warn_downgrade(DnsServer
*server
);
123 DnsServer
*dns_server_find(DnsServer
*first
, int family
, const union in_addr_union
*in_addr
, int ifindex
);
125 void dns_server_unlink_all(DnsServer
*first
);
126 void dns_server_unlink_marked(DnsServer
*first
);
127 void dns_server_mark_all(DnsServer
*first
);
129 DnsServer
*manager_get_first_dns_server(Manager
*m
, DnsServerType t
);
131 DnsServer
*manager_set_dns_server(Manager
*m
, DnsServer
*s
);
132 DnsServer
*manager_get_dns_server(Manager
*m
);
133 void manager_next_dns_server(Manager
*m
);
135 DnssecMode
dns_server_get_dnssec_mode(DnsServer
*s
);
136 DnsOverTlsMode
dns_server_get_dns_over_tls_mode(DnsServer
*s
);
138 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer
*, dns_server_unref
);
140 extern const struct hash_ops dns_server_hash_ops
;
142 void dns_server_flush_cache(DnsServer
*s
);
144 void dns_server_reset_features(DnsServer
*s
);
145 void dns_server_reset_features_all(DnsServer
*s
);
147 void dns_server_dump(DnsServer
*s
, FILE *f
);
149 void dns_server_unref_stream(DnsServer
*s
);
151 DnsScope
*dns_server_scope(DnsServer
*s
);