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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include "in-addr-util.h"
#include "json.h"
#include "list.h"
#include "resolve-util.h"
#include "time-util.h"
typedef struct DnsScope DnsScope;
typedef struct DnsServer DnsServer;
typedef struct DnsStream DnsStream;
typedef struct DnsPacket DnsPacket;
typedef struct Link Link;
typedef struct Manager Manager;
#include "resolved-dnstls.h"
typedef enum DnsServerType {
DNS_SERVER_SYSTEM,
DNS_SERVER_FALLBACK,
DNS_SERVER_LINK,
_DNS_SERVER_TYPE_MAX,
_DNS_SERVER_TYPE_INVALID = -EINVAL,
} DnsServerType;
#include "resolved-conf.h"
const char* dns_server_type_to_string(DnsServerType i) _const_;
DnsServerType dns_server_type_from_string(const char *s) _pure_;
typedef enum DnsServerFeatureLevel {
DNS_SERVER_FEATURE_LEVEL_TCP,
DNS_SERVER_FEATURE_LEVEL_UDP,
DNS_SERVER_FEATURE_LEVEL_EDNS0,
DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN,
DNS_SERVER_FEATURE_LEVEL_DO,
DNS_SERVER_FEATURE_LEVEL_TLS_DO,
_DNS_SERVER_FEATURE_LEVEL_MAX,
_DNS_SERVER_FEATURE_LEVEL_INVALID = -EINVAL,
} DnsServerFeatureLevel;
#define DNS_SERVER_FEATURE_LEVEL_WORST 0
#define DNS_SERVER_FEATURE_LEVEL_BEST (_DNS_SERVER_FEATURE_LEVEL_MAX - 1)
#define DNS_SERVER_FEATURE_LEVEL_IS_EDNS0(x) ((x) >= DNS_SERVER_FEATURE_LEVEL_EDNS0)
#define DNS_SERVER_FEATURE_LEVEL_IS_TLS(x) IN_SET(x, DNS_SERVER_FEATURE_LEVEL_TLS_PLAIN, DNS_SERVER_FEATURE_LEVEL_TLS_DO)
#define DNS_SERVER_FEATURE_LEVEL_IS_DNSSEC(x) ((x) >= DNS_SERVER_FEATURE_LEVEL_DO)
#define DNS_SERVER_FEATURE_LEVEL_IS_UDP(x) IN_SET(x, DNS_SERVER_FEATURE_LEVEL_UDP, DNS_SERVER_FEATURE_LEVEL_EDNS0, DNS_SERVER_FEATURE_LEVEL_DO)
const char* dns_server_feature_level_to_string(DnsServerFeatureLevel i) _const_;
DnsServerFeatureLevel dns_server_feature_level_from_string(const char *s) _pure_;
struct DnsServer {
Manager *manager;
unsigned n_ref;
DnsServerType type;
Link *link;
int family;
union in_addr_union address;
int ifindex; /* for IPv6 link-local DNS servers */
uint16_t port;
char *server_name;
char *server_string;
char *server_string_full;
/* The long-lived stream towards this server. */
DnsStream *stream;
#if ENABLE_DNS_OVER_TLS
DnsTlsServerData dnstls_data;
#endif
DnsServerFeatureLevel verified_feature_level;
DnsServerFeatureLevel possible_feature_level;
size_t received_udp_fragment_max; /* largest packet or fragment (without IP/UDP header) we saw so far */
unsigned n_failed_udp;
unsigned n_failed_tcp;
unsigned n_failed_tls;
bool packet_truncated:1; /* Set when TC bit was set on reply */
bool packet_bad_opt:1; /* Set when OPT was missing or otherwise bad on reply */
bool packet_rrsig_missing:1; /* Set when RRSIG was missing */
bool packet_invalid:1; /* Set when we failed to parse a reply */
bool packet_do_off:1; /* Set when the server didn't copy DNSSEC DO flag from request to response */
bool packet_fragmented:1; /* Set when we ever saw a fragmented packet */
usec_t verified_usec;
usec_t features_grace_period_usec;
/* Whether we already warned about downgrading to non-DNSSEC mode for this server */
bool warned_downgrade:1;
/* Used when GC'ing old DNS servers when configuration changes. */
bool marked:1;
/* If linked is set, then this server appears in the servers linked list */
bool linked:1;
LIST_FIELDS(DnsServer, servers);
/* Servers registered via D-Bus are not removed on reload */
ResolveConfigSource config_source;
};
int dns_server_new(
Manager *m,
DnsServer **ret,
DnsServerType type,
Link *link,
int family,
const union in_addr_union *address,
uint16_t port,
int ifindex,
const char *server_string,
ResolveConfigSource config_source);
DnsServer* dns_server_ref(DnsServer *s);
DnsServer* dns_server_unref(DnsServer *s);
void dns_server_unlink(DnsServer *s);
void dns_server_move_back_and_unmark(DnsServer *s);
void dns_server_packet_received(DnsServer *s, int protocol, DnsServerFeatureLevel level, size_t fragsize);
void dns_server_packet_lost(DnsServer *s, int protocol, DnsServerFeatureLevel level);
void dns_server_packet_truncated(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_rrsig_missing(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_bad_opt(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_rcode_downgrade(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_invalid(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_do_off(DnsServer *s, DnsServerFeatureLevel level);
void dns_server_packet_udp_fragmented(DnsServer *s, size_t fragsize);
DnsServerFeatureLevel dns_server_possible_feature_level(DnsServer *s);
int dns_server_adjust_opt(DnsServer *server, DnsPacket *packet, DnsServerFeatureLevel level);
const char *dns_server_string(DnsServer *server);
const char *dns_server_string_full(DnsServer *server);
int dns_server_ifindex(const DnsServer *s);
uint16_t dns_server_port(const DnsServer *s);
bool dns_server_dnssec_supported(DnsServer *server);
void dns_server_warn_downgrade(DnsServer *server);
DnsServer *dns_server_find(DnsServer *first, int family, const union in_addr_union *in_addr, uint16_t port, int ifindex, const char *name);
void dns_server_unlink_all(DnsServer *first);
void dns_server_unlink_on_reload(DnsServer *server);
bool dns_server_unlink_marked(DnsServer *first);
void dns_server_mark_all(DnsServer *first);
DnsServer *manager_get_first_dns_server(Manager *m, DnsServerType t);
DnsServer *manager_set_dns_server(Manager *m, DnsServer *s);
DnsServer *manager_get_dns_server(Manager *m);
void manager_next_dns_server(Manager *m, DnsServer *if_current);
DnssecMode dns_server_get_dnssec_mode(DnsServer *s);
DnsOverTlsMode dns_server_get_dns_over_tls_mode(DnsServer *s);
size_t dns_server_get_mtu(DnsServer *s);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer*, dns_server_unref);
extern const struct hash_ops dns_server_hash_ops;
void dns_server_flush_cache(DnsServer *s);
void dns_server_reset_features(DnsServer *s);
void dns_server_reset_features_all(DnsServer *s);
void dns_server_dump(DnsServer *s, FILE *f);
void dns_server_unref_stream(DnsServer *s);
DnsScope *dns_server_scope(DnsServer *s);
int dns_server_dump_state_to_json(DnsServer *server, JsonVariant **ret);
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