src/resolve/resolved-manager.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 #include <sys/stat.h>
   5
   6 #include "common-signal.h"
   7 #include "forward.h"
   8 #include "list.h"
   9 #include "resolve-util.h"
  10 #include "resolved-dns-browse-services.h"
  11 #include "resolved-dns-dnssec.h"
  12 #include "resolved-dns-stream.h"
  13 #include "resolved-dns-stub.h"
  14 #include "resolved-dns-trust-anchor.h"
  15 #include "resolved-etc-hosts.h"
  16 #include "resolved-forward.h"
  17
  18 #define MANAGER_SEARCH_DOMAINS_MAX 1024
  19 #define MANAGER_DNS_SERVERS_MAX 256
  20
  21 typedef struct Manager {
  22         sd_event *event;
  23
  24         ResolveSupport llmnr_support;
  25         ResolveSupport mdns_support;
  26         DnssecMode dnssec_mode;
  27         DnsOverTlsMode dns_over_tls_mode;
  28         DnsCacheMode enable_cache;
  29         bool cache_from_localhost;
  30         DnsStubListenerMode dns_stub_listener_mode;
  31         usec_t stale_retention_usec;
  32
  33 #if ENABLE_DNS_OVER_TLS
  34         DnsTlsManagerData dnstls_data;
  35 #endif
  36
  37         /* Network */
  38         Hashmap *links;
  39
  40         sd_netlink *rtnl;
  41         sd_event_source *rtnl_event_source;
  42
  43         sd_network_monitor *network_monitor;
  44         sd_event_source *network_event_source;
  45
  46         /* DNS query management */
  47         Hashmap *dns_transactions;
  48         LIST_HEAD(DnsQuery, dns_queries);
  49         unsigned n_dns_queries;
  50         Hashmap *stub_queries_by_packet;
  51
  52         LIST_HEAD(DnsStream, dns_streams);
  53         unsigned n_dns_streams[_DNS_STREAM_TYPE_MAX];
  54
  55         /* Unicast dns */
  56         LIST_HEAD(DnsServer, dns_servers);
  57         LIST_HEAD(DnsServer, fallback_dns_servers);
  58         unsigned n_dns_servers; /* counts both main and fallback */
  59         DnsServer *current_dns_server;
  60
  61         LIST_HEAD(DnsSearchDomain, search_domains);
  62         unsigned n_search_domains;
  63
  64         bool need_builtin_fallbacks;
  65         bool read_resolv_conf;
  66         bool resolve_unicast_single_label;
  67
  68         struct stat resolv_conf_stat;
  69
  70         DnsTrustAnchor trust_anchor;
  71
  72         LIST_HEAD(DnsScope, dns_scopes);
  73         DnsScope *unicast_scope;
  74
  75         Hashmap *delegates; /* id string → DnsDelegate objects */
  76
  77         /* LLMNR */
  78         int llmnr_ipv4_udp_fd;
  79         int llmnr_ipv6_udp_fd;
  80         int llmnr_ipv4_tcp_fd;
  81         int llmnr_ipv6_tcp_fd;
  82
  83         sd_event_source *llmnr_ipv4_udp_event_source;
  84         sd_event_source *llmnr_ipv6_udp_event_source;
  85         sd_event_source *llmnr_ipv4_tcp_event_source;
  86         sd_event_source *llmnr_ipv6_tcp_event_source;
  87
  88         /* mDNS */
  89         int mdns_ipv4_fd;
  90         int mdns_ipv6_fd;
  91         sd_event_source *mdns_ipv4_event_source;
  92         sd_event_source *mdns_ipv6_event_source;
  93
  94         /* DNS-SD */
  95         Hashmap *dnssd_registered_services;
  96
  97         /* dbus */
  98         sd_bus *bus;
  99
 100         /* The hostname we publish on LLMNR and mDNS */
 101         char *full_hostname;
 102         char *llmnr_hostname;
 103         char *mdns_hostname;
 104         DnsResourceKey *llmnr_host_ipv4_key;
 105         DnsResourceKey *llmnr_host_ipv6_key;
 106         DnsResourceKey *mdns_host_ipv4_key;
 107         DnsResourceKey *mdns_host_ipv6_key;
 108
 109         /* Watch the system hostname */
 110         int hostname_fd;
 111         sd_event_source *hostname_event_source;
 112
 113         unsigned n_transactions_total;
 114         unsigned n_timeouts_total;
 115         unsigned n_timeouts_served_stale_total;
 116         unsigned n_failure_responses_total;
 117         unsigned n_failure_responses_served_stale_total;
 118
 119         unsigned n_dnssec_verdict[_DNSSEC_VERDICT_MAX];
 120
 121         /* Data from /etc/hosts */
 122         EtcHosts etc_hosts;
 123         usec_t etc_hosts_last;
 124         struct stat etc_hosts_stat;
 125         bool read_etc_hosts;
 126
 127         /* List of refused DNS Record Types*/
 128         Set *refuse_record_types;
 129
 130         OrderedSet *dns_extra_stub_listeners;
 131
 132         /* Local DNS stub on 127.0.0.53:53 */
 133         sd_event_source *dns_stub_udp_event_source;
 134         sd_event_source *dns_stub_tcp_event_source;
 135
 136         /* Local DNS proxy stub on 127.0.0.54:53 */
 137         sd_event_source *dns_proxy_stub_udp_event_source;
 138         sd_event_source *dns_proxy_stub_tcp_event_source;
 139
 140         Hashmap *polkit_registry;
 141
 142         sd_varlink_server *varlink_server;
 143         sd_varlink_server *varlink_monitor_server;
 144
 145         Set *varlink_query_results_subscription;
 146         Set *varlink_dns_configuration_subscription;
 147
 148         sd_json_variant *dns_configuration_json;
 149
 150         sd_netlink_slot *netlink_new_route_slot;
 151         sd_netlink_slot *netlink_del_route_slot;
 152
 153         sd_event_source *clock_change_event_source;
 154
 155         LIST_HEAD(SocketGraveyard, socket_graveyard);
 156         SocketGraveyard *socket_graveyard_oldest;
 157         size_t n_socket_graveyard;
 158
 159         struct sigrtmin18_info sigrtmin18_info;
 160
 161         /* Map varlink links to DnsServiceBrowser instances. */
 162         Hashmap *dns_service_browsers;
 163 } Manager;
 164
 165 /* Manager */
 166
 167 int manager_new(Manager **ret);
 168 Manager* manager_free(Manager *m);
 169
 170 int manager_start(Manager *m);
 171
 172 uint32_t manager_find_mtu(Manager *m);
 173
 174 int manager_monitor_send(Manager *m, DnsQuery *q);
 175
 176 int sendmsg_loop(int fd, struct msghdr *mh, int flags);
 177 int manager_write(Manager *m, int fd, DnsPacket *p);
 178 int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *destination, uint16_t port, const union in_addr_union *source, DnsPacket *p);
 179 int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret);
 180
 181 int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr);
 182 LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr);
 183
 184 void manager_refresh_rrs(Manager *m);
 185 int manager_next_hostname(Manager *m);
 186
 187 bool manager_packet_from_local_address(Manager *m, DnsPacket *p);
 188 bool manager_packet_from_our_transaction(Manager *m, DnsPacket *p);
 189
 190 DnsScope* manager_find_scope_from_protocol(Manager *m, int ifindex, DnsProtocol protocol, int family);
 191
 192 static inline DnsScope* manager_find_scope(Manager *m, DnsPacket *p) {
 193         assert(m);
 194         assert(p);
 195         return manager_find_scope_from_protocol(m, p->ifindex, p->protocol, p->family);
 196 }
 197
 198 void manager_verify_all(Manager *m);
 199
 200 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
 201
 202 /* For some reason we need some extra cmsg space on some kernels/archs. One of those days we need to figure out why */
 203 #define EXTRA_CMSG_SPACE 1024
 204
 205 int manager_is_own_hostname(Manager *m, const char *name);
 206
 207 int manager_compile_dns_servers(Manager *m, OrderedSet **servers);
 208 int manager_compile_search_domains(Manager *m, OrderedSet **domains, int filter_route);
 209
 210 DnssecMode manager_get_dnssec_mode(Manager *m);
 211 bool manager_dnssec_supported(Manager *m);
 212
 213 DnsOverTlsMode manager_get_dns_over_tls_mode(Manager *m);
 214
 215 void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key);
 216
 217 bool manager_routable(Manager *m);
 218
 219 void manager_flush_caches(Manager *m, int log_level);
 220 void manager_reset_server_features(Manager *m);
 221
 222 void manager_cleanup_saved_user(Manager *m);
 223
 224 bool manager_next_dnssd_names(Manager *m);
 225
 226 bool manager_server_is_stub(Manager *m, DnsServer *s);
 227
 228 int socket_disable_pmtud(int fd, int af);
 229
 230 int dns_manager_dump_statistics_json(Manager *m, sd_json_variant **ret);
 231
 232 void dns_manager_reset_statistics(Manager *m);
 233
 234 int manager_dump_dns_configuration_json(Manager *m, sd_json_variant **ret);
 235 int manager_send_dns_configuration_changed(Manager *m, Link *l, bool reset);
 236
 237 int manager_start_dns_configuration_monitor(Manager *m);
 238 void manager_stop_dns_configuration_monitor(Manager *m);