diff options
Diffstat (limited to 'src/grp-resolve/systemd-resolved/resolved-dns-server.h')
-rw-r--r-- | src/grp-resolve/systemd-resolved/resolved-dns-server.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/src/grp-resolve/systemd-resolved/resolved-dns-server.h b/src/grp-resolve/systemd-resolved/resolved-dns-server.h new file mode 100644 index 0000000000..9e216fb991 --- /dev/null +++ b/src/grp-resolve/systemd-resolved/resolved-dns-server.h @@ -0,0 +1,147 @@ +#pragma once + +/*** + This file is part of systemd. + + Copyright 2014 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include "basic/in-addr-util.h" + +typedef struct DnsServer DnsServer; + +typedef enum DnsServerType { + DNS_SERVER_SYSTEM, + DNS_SERVER_FALLBACK, + DNS_SERVER_LINK, +} DnsServerType; +#define _DNS_SERVER_TYPE_MAX (DNS_SERVER_LINK + 1) + +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_DO, + DNS_SERVER_FEATURE_LEVEL_LARGE, + _DNS_SERVER_FEATURE_LEVEL_MAX, + _DNS_SERVER_FEATURE_LEVEL_INVALID = -1 +} DnsServerFeatureLevel; + +#define DNS_SERVER_FEATURE_LEVEL_WORST 0 +#define DNS_SERVER_FEATURE_LEVEL_BEST (_DNS_SERVER_FEATURE_LEVEL_MAX - 1) + +const char* dns_server_feature_level_to_string(int i) _const_; +int dns_server_feature_level_from_string(const char *s) _pure_; + +#include "resolved-link.h" +#include "resolved-manager.h" + +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 */ + + char *server_string; + + usec_t resend_timeout; + usec_t max_rtt; + + DnsServerFeatureLevel verified_feature_level; + DnsServerFeatureLevel possible_feature_level; + + size_t received_udp_packet_max; + + unsigned n_failed_udp; + unsigned n_failed_tcp; + + bool packet_truncated:1; + bool packet_bad_opt:1; + bool packet_rrsig_missing:1; + + 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, + int ifindex); + +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, usec_t rtt, size_t size); +void dns_server_packet_lost(DnsServer *s, int protocol, DnsServerFeatureLevel level, usec_t usec); +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); + +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); +int dns_server_ifindex(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, int ifindex); + +void dns_server_unlink_all(DnsServer *first); +void 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); + +bool dns_server_address_valid(int family, const union in_addr_union *sa); + +DEFINE_TRIVIAL_CLEANUP_FUNC(DnsServer*, dns_server_unref); + +extern const struct hash_ops dns_server_hash_ops; |