d20b1667db
We used to have one global socket, use one per transaction instead. This has the side-effect of giving us a random UDP port per transaction, and hence increasing the entropy and making cache poisoining significantly harder to achieve. We still reuse the same port number for packets belonging to the same transaction (resent packets).
144 lines
4.1 KiB
C
144 lines
4.1 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-network.h"
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#include "sd-netlink.h"
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#include "list.h"
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#include "hashmap.h"
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typedef struct Manager Manager;
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typedef enum Support Support;
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enum Support {
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SUPPORT_NO,
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SUPPORT_YES,
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SUPPORT_RESOLVE,
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_SUPPORT_MAX,
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_SUPPORT_INVALID = -1
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};
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#include "resolved-dns-query.h"
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#include "resolved-dns-stream.h"
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#include "resolved-link.h"
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struct Manager {
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sd_event *event;
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Support llmnr_support;
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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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DnsServer *current_dns_server;
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bool read_resolv_conf;
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usec_t resolv_conf_mtime;
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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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/* 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 *hostname;
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DnsResourceKey *host_ipv4_key;
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DnsResourceKey *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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};
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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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int manager_read_resolv_conf(Manager *m);
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int manager_write_resolv_conf(Manager *m);
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DnsServer *manager_set_dns_server(Manager *m, DnsServer *s);
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DnsServer *manager_find_dns_server(Manager *m, int family, const union in_addr_union *in_addr);
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DnsServer *manager_get_dns_server(Manager *m);
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void manager_next_dns_server(Manager *m);
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uint32_t manager_find_mtu(Manager *m);
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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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void manager_flush_dns_servers(Manager *m, DnsServerType t);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
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#define EXTRA_CMSG_SPACE 1024
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const char* support_to_string(Support p) _const_;
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int support_from_string(const char *s) _pure_;
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