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
index 0000000..f939b53
--- /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);