011696f762
Previously, if a hostanem is resolved with AF_UNSPEC specified, this would be used as indication to resolve both an AF_INET and an AF_INET6 address. With this change this logic is altered: an AF_INET address is only resolved if there's actually a routable IPv4 address on the specific interface, and similar an AF_INET6 address is only resolved if there's a routable IPv6 address. With this in place, it's ensured that the returned data is actually connectable by applications. This logic mimics glibc's resolver behaviour. Note that if the client asks explicitly for AF_INET or AF_INET6 it will get what it asked for. This also simplifies the logic how it is determined whether a specific lookup shall take place on a scope. Specifically, the checks with dns_scope_good_key() are now moved out of the transaction code and into the query code, so that we don't even create a transaction object on a specific scope if we cannot execute the resolution on it anyway.
174 lines
5 KiB
C
174 lines
5 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2014 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sd-event.h"
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#include "sd-netlink.h"
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#include "sd-network.h"
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#include "hashmap.h"
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#include "list.h"
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#include "ordered-set.h"
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#include "resolve-util.h"
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typedef struct Manager Manager;
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#include "resolved-dns-query.h"
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#include "resolved-dns-search-domain.h"
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#include "resolved-dns-server.h"
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#include "resolved-dns-stream.h"
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#include "resolved-dns-trust-anchor.h"
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#include "resolved-link.h"
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#define MANAGER_SEARCH_DOMAINS_MAX 32
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#define MANAGER_DNS_SERVERS_MAX 32
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struct Manager {
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sd_event *event;
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ResolveSupport llmnr_support;
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ResolveSupport mdns_support;
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DnssecMode dnssec_mode;
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/* Network */
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Hashmap *links;
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sd_netlink *rtnl;
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sd_event_source *rtnl_event_source;
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sd_network_monitor *network_monitor;
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sd_event_source *network_event_source;
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/* DNS query management */
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Hashmap *dns_transactions;
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LIST_HEAD(DnsQuery, dns_queries);
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unsigned n_dns_queries;
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LIST_HEAD(DnsStream, dns_streams);
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unsigned n_dns_streams;
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/* Unicast dns */
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LIST_HEAD(DnsServer, dns_servers);
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LIST_HEAD(DnsServer, fallback_dns_servers);
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unsigned n_dns_servers; /* counts both main and fallback */
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DnsServer *current_dns_server;
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LIST_HEAD(DnsSearchDomain, search_domains);
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unsigned n_search_domains;
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bool permit_domain_search;
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bool need_builtin_fallbacks:1;
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bool read_resolv_conf:1;
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usec_t resolv_conf_mtime;
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DnsTrustAnchor trust_anchor;
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LIST_HEAD(DnsScope, dns_scopes);
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DnsScope *unicast_scope;
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/* LLMNR */
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int llmnr_ipv4_udp_fd;
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int llmnr_ipv6_udp_fd;
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int llmnr_ipv4_tcp_fd;
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int llmnr_ipv6_tcp_fd;
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sd_event_source *llmnr_ipv4_udp_event_source;
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sd_event_source *llmnr_ipv6_udp_event_source;
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sd_event_source *llmnr_ipv4_tcp_event_source;
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sd_event_source *llmnr_ipv6_tcp_event_source;
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/* mDNS */
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int mdns_ipv4_fd;
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int mdns_ipv6_fd;
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sd_event_source *mdns_ipv4_event_source;
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sd_event_source *mdns_ipv6_event_source;
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/* dbus */
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sd_bus *bus;
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sd_event_source *bus_retry_event_source;
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/* The hostname we publish on LLMNR and mDNS */
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char *llmnr_hostname;
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char *mdns_hostname;
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DnsResourceKey *llmnr_host_ipv4_key;
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DnsResourceKey *llmnr_host_ipv6_key;
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/* Watch the system hostname */
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int hostname_fd;
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sd_event_source *hostname_event_source;
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/* Watch for system suspends */
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sd_bus_slot *prepare_for_sleep_slot;
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sd_event_source *sigusr1_event_source;
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unsigned n_transactions_total;
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unsigned n_dnssec_verdict[_DNSSEC_VERDICT_MAX];
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/* Data from /etc/hosts */
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Set* etc_hosts_by_address;
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Hashmap* etc_hosts_by_name;
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usec_t etc_hosts_last, etc_hosts_mtime;
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};
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/* Manager */
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int manager_new(Manager **ret);
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Manager* manager_free(Manager *m);
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int manager_start(Manager *m);
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uint32_t manager_find_mtu(Manager *m);
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int manager_write(Manager *m, int fd, DnsPacket *p);
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int manager_send(Manager *m, int fd, int ifindex, int family, const union in_addr_union *addr, uint16_t port, DnsPacket *p);
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int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret);
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int manager_find_ifindex(Manager *m, int family, const union in_addr_union *in_addr);
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LinkAddress* manager_find_link_address(Manager *m, int family, const union in_addr_union *in_addr);
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void manager_refresh_rrs(Manager *m);
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int manager_next_hostname(Manager *m);
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bool manager_our_packet(Manager *m, DnsPacket *p);
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DnsScope* manager_find_scope(Manager *m, DnsPacket *p);
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void manager_verify_all(Manager *m);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
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#define EXTRA_CMSG_SPACE 1024
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int manager_is_own_hostname(Manager *m, const char *name);
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int manager_compile_dns_servers(Manager *m, OrderedSet **servers);
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int manager_compile_search_domains(Manager *m, OrderedSet **domains);
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DnssecMode manager_get_dnssec_mode(Manager *m);
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bool manager_dnssec_supported(Manager *m);
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void manager_dnssec_verdict(Manager *m, DnssecVerdict verdict, const DnsResourceKey *key);
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bool manager_routable(Manager *m, int family);
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