src/resolve/resolved-dns-server.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include "in-addr-util.h"
   5 #include "list.h"
   6 #include "resolve-util.h"
   7 #include "time-util.h"
   8
   9 typedef struct DnsScope DnsScope;
  10 typedef struct DnsServer DnsServer;
  11 typedef struct DnsStream DnsStream;
  12 typedef struct DnsPacket DnsPacket;
  13 typedef struct Link Link;
  14 typedef struct Manager Manager;
  15
  16 #include "resolved-dnstls.h"
  17
  18 typedef enum DnsServerType {
  19         DNS_SERVER_SYSTEM,
  20         DNS_SERVER_FALLBACK,
  21         DNS_SERVER_LINK,
  22         _DNS_SERVER_TYPE_MAX,
  23         _DNS_SERVER_TYPE_INVALID = -1
  24 } DnsServerType;
  25
  26 const char* dns_server_type_to_string(DnsServerType i) _const_;
  27 DnsServerType dns_server_type_from_string(const char *s) _pure_;
  28
  29 typedef enum DnsServerFeatureLevel {
  30         DNS_SERVER_FEATURE_LEVEL_TCP,
  31         DNS_SERVER_FEATURE_LEVEL_UDP,
  32         DNS_SERVER_FEATURE_LEVEL_EDNS0,
  33         DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN,
  34         DNS_SERVER_FEATURE_LEVEL_DO,
  35         DNS_SERVER_FEATURE_LEVEL_LARGE,
  36         DNS_SERVER_FEATURE_LEVEL_TLS_DO,
  37         _DNS_SERVER_FEATURE_LEVEL_MAX,
  38         _DNS_SERVER_FEATURE_LEVEL_INVALID = -1
  39 } DnsServerFeatureLevel;
  40
  41 #define DNS_SERVER_FEATURE_LEVEL_WORST 0
  42 #define DNS_SERVER_FEATURE_LEVEL_BEST (_DNS_SERVER_FEATURE_LEVEL_MAX - 1)
  43 #define DNS_SERVER_FEATURE_LEVEL_IS_TLS(x) IN_SET(x, DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO)
  44
  45 const char* dns_server_feature_level_to_string(int i) _const_;
  46 int dns_server_feature_level_from_string(const char *s) _pure_;
  47
  48 struct DnsServer {
  49         Manager *manager;
  50
  51         unsigned n_ref;
  52
  53         DnsServerType type;
  54         Link *link;
  55
  56         int family;
  57         union in_addr_union address;
  58         int ifindex; /* for IPv6 link-local DNS servers */
  59
  60         char *server_string;
  61
  62         char *server_name;
  63
  64         /* The long-lived stream towards this server. */
  65         DnsStream *stream;
  66
  67 #if ENABLE_DNS_OVER_TLS
  68         DnsTlsServerData dnstls_data;
  69 #endif
  70
  71         DnsServerFeatureLevel verified_feature_level;
  72         DnsServerFeatureLevel possible_feature_level;
  73
  74         size_t received_udp_packet_max;
  75
  76         unsigned n_failed_udp;
  77         unsigned n_failed_tcp;
  78         unsigned n_failed_tls;
  79
  80         bool packet_truncated:1;
  81         bool packet_bad_opt:1;
  82         bool packet_rrsig_missing:1;
  83
  84         usec_t verified_usec;
  85         usec_t features_grace_period_usec;
  86
  87         /* Whether we already warned about downgrading to non-DNSSEC mode for this server */
  88         bool warned_downgrade:1;
  89
  90         /* Used when GC'ing old DNS servers when configuration changes. */
  91         bool marked:1;
  92
  93         /* If linked is set, then this server appears in the servers linked list */
  94         bool linked:1;
  95         LIST_FIELDS(DnsServer, servers);
  96 };
  97
  98 int dns_server_new(
  99                 Manager *m,
 100                 DnsServer **ret,
 101                 DnsServerType type,
 102                 Link *link,
 103                 int family,
 104                 const union in_addr_union *address,
 105                 int ifindex,
 106                 const char *server_string);
 107
 108 DnsServer* dns_server_ref(DnsServer *s);
 109 DnsServer* dns_server_unref(DnsServer *s);
 110
 111 void dns_server_unlink(DnsServer *s);
 112 void dns_server_move_back_and_unmark(DnsServer *s);
 113
 114 void dns_server_packet_received(DnsServer *s, int protocol, DnsServerFeatureLevel level, size_t size);
 115 void dns_server_packet_lost(DnsServer *s, int protocol, DnsServerFeatureLevel level);
 116 void dns_server_packet_truncated(DnsServer *s, DnsServerFeatureLevel level);
 117 void dns_server_packet_rrsig_missing(DnsServer *s, DnsServerFeatureLevel level);
 118 void dns_server_packet_bad_opt(DnsServer *s, DnsServerFeatureLevel level);
 119 void dns_server_packet_rcode_downgrade(DnsServer *s, DnsServerFeatureLevel level);
 120
 121 DnsServerFeatureLevel dns_server_possible_feature_level(DnsServer *s);
 122
 123 int dns_server_adjust_opt(DnsServer *server, DnsPacket *packet, DnsServerFeatureLevel level);
 124
 125 const char *dns_server_string(DnsServer *server);
 126 int dns_server_ifindex(const DnsServer *s);
 127
 128 bool dns_server_dnssec_supported(DnsServer *server);
 129
 130 void dns_server_warn_downgrade(DnsServer *server);
 131
 132 DnsServer *dns_server_find(DnsServer *first, int family, const union in_addr_union *in_addr, int ifindex);
 133
 134 void dns_server_unlink_all(DnsServer *first);
 135 void dns_server_unlink_marked(DnsServer *first);
 136 void dns_server_mark_all(DnsServer *first);
 137
 138 DnsServer *manager_get_first_dns_server(Manager *m, DnsServerType t);
 139
 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);
 143
 144 DnssecMode dns_server_get_dnssec_mode(DnsServer *s);
 145 DnsOverTlsMode dns_server_get_dns_over_tls_mode(DnsServer *s);
 146
 147 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer*, dns_server_unref);
 148
 149 extern const struct hash_ops dns_server_hash_ops;
 150
 151 void dns_server_flush_cache(DnsServer *s);
 152
 153 void dns_server_reset_features(DnsServer *s);
 154 void dns_server_reset_features_all(DnsServer *s);
 155
 156 void dns_server_dump(DnsServer *s, FILE *f);
 157
 158 void dns_server_unref_stream(DnsServer *s);
 159
 160 DnsScope *dns_server_scope(DnsServer *s);