src/resolve/resolved-dns-server.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include "in-addr-util.h"
   5
   6 typedef struct DnsServer DnsServer;
   7
   8 typedef enum DnsServerType {
   9         DNS_SERVER_SYSTEM,
  10         DNS_SERVER_FALLBACK,
  11         DNS_SERVER_LINK,
  12         _DNS_SERVER_TYPE_MAX,
  13         _DNS_SERVER_TYPE_INVALID = -1
  14 } DnsServerType;
  15
  16 const char* dns_server_type_to_string(DnsServerType i) _const_;
  17 DnsServerType dns_server_type_from_string(const char *s) _pure_;
  18
  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;
  30
  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)
  34
  35 const char* dns_server_feature_level_to_string(int i) _const_;
  36 int dns_server_feature_level_from_string(const char *s) _pure_;
  37
  38 #include "resolved-link.h"
  39 #include "resolved-manager.h"
  40 #if ENABLE_DNS_OVER_TLS
  41 #include "resolved-dnstls.h"
  42 #endif
  43
  44 struct DnsServer {
  45         Manager *manager;
  46
  47         unsigned n_ref;
  48
  49         DnsServerType type;
  50         Link *link;
  51
  52         int family;
  53         union in_addr_union address;
  54         int ifindex; /* for IPv6 link-local DNS servers */
  55
  56         char *server_string;
  57
  58         /* The long-lived stream towards this server. */
  59         DnsStream *stream;
  60
  61 #if ENABLE_DNS_OVER_TLS
  62         DnsTlsServerData dnstls_data;
  63 #endif
  64
  65         DnsServerFeatureLevel verified_feature_level;
  66         DnsServerFeatureLevel possible_feature_level;
  67
  68         size_t received_udp_packet_max;
  69
  70         unsigned n_failed_udp;
  71         unsigned n_failed_tcp;
  72         unsigned n_failed_tls;
  73
  74         bool packet_truncated:1;
  75         bool packet_bad_opt:1;
  76         bool packet_rrsig_missing:1;
  77
  78         usec_t verified_usec;
  79         usec_t features_grace_period_usec;
  80
  81         /* Whether we already warned about downgrading to non-DNSSEC mode for this server */
  82         bool warned_downgrade:1;
  83
  84         /* Used when GC'ing old DNS servers when configuration changes. */
  85         bool marked:1;
  86
  87         /* If linked is set, then this server appears in the servers linked list */
  88         bool linked:1;
  89         LIST_FIELDS(DnsServer, servers);
  90 };
  91
  92 int dns_server_new(
  93                 Manager *m,
  94                 DnsServer **ret,
  95                 DnsServerType type,
  96                 Link *link,
  97                 int family,
  98                 const union in_addr_union *address,
  99                 int ifindex);
 100
 101 DnsServer* dns_server_ref(DnsServer *s);
 102 DnsServer* dns_server_unref(DnsServer *s);
 103
 104 void dns_server_unlink(DnsServer *s);
 105 void dns_server_move_back_and_unmark(DnsServer *s);
 106
 107 void dns_server_packet_received(DnsServer *s, int protocol, DnsServerFeatureLevel level, size_t size);
 108 void dns_server_packet_lost(DnsServer *s, int protocol, DnsServerFeatureLevel level);
 109 void dns_server_packet_truncated(DnsServer *s, DnsServerFeatureLevel level);
 110 void dns_server_packet_rrsig_missing(DnsServer *s, DnsServerFeatureLevel level);
 111 void dns_server_packet_bad_opt(DnsServer *s, DnsServerFeatureLevel level);
 112 void dns_server_packet_rcode_downgrade(DnsServer *s, DnsServerFeatureLevel level);
 113
 114 DnsServerFeatureLevel dns_server_possible_feature_level(DnsServer *s);
 115
 116 int dns_server_adjust_opt(DnsServer *server, DnsPacket *packet, DnsServerFeatureLevel level);
 117
 118 const char *dns_server_string(DnsServer *server);
 119 int dns_server_ifindex(const DnsServer *s);
 120
 121 bool dns_server_dnssec_supported(DnsServer *server);
 122
 123 void dns_server_warn_downgrade(DnsServer *server);
 124
 125 DnsServer *dns_server_find(DnsServer *first, int family, const union in_addr_union *in_addr, int ifindex);
 126
 127 void dns_server_unlink_all(DnsServer *first);
 128 void dns_server_unlink_marked(DnsServer *first);
 129 void dns_server_mark_all(DnsServer *first);
 130
 131 DnsServer *manager_get_first_dns_server(Manager *m, DnsServerType t);
 132
 133 DnsServer *manager_set_dns_server(Manager *m, DnsServer *s);
 134 DnsServer *manager_get_dns_server(Manager *m);
 135 void manager_next_dns_server(Manager *m);
 136
 137 bool dns_server_address_valid(int family, const union in_addr_union *sa);
 138
 139 DnssecMode dns_server_get_dnssec_mode(DnsServer *s);
 140 DnsOverTlsMode dns_server_get_dns_over_tls_mode(DnsServer *s);
 141
 142 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer*, dns_server_unref);
 143
 144 extern const struct hash_ops dns_server_hash_ops;
 145
 146 void dns_server_flush_cache(DnsServer *s);
 147
 148 void dns_server_reset_features(DnsServer *s);
 149 void dns_server_reset_features_all(DnsServer *s);
 150
 151 void dns_server_dump(DnsServer *s, FILE *f);
 152
 153 void dns_server_unref_stream(DnsServer *s);
 154
 155 DnsScope *dns_server_scope(DnsServer *s);