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-rw-r--r--src/resolve/resolved-dns-server.h174
1 files changed, 174 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-server.h b/src/resolve/resolved-dns-server.h
new file mode 100644
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--- /dev/null
+++ b/src/resolve/resolved-dns-server.h
@@ -0,0 +1,174 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "in-addr-util.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;
+
+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);
+};
+
+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);
+
+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);
+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);