1 /* SPDX-License-Identifier: LGPL-2.1+ */
4 #include <netinet/in.h>
16 #include "alloc-util.h"
17 #include "bus-polkit.h"
18 #include "dirent-util.h"
19 #include "dns-domain.h"
22 #include "hostname-util.h"
24 #include "missing_network.h"
25 #include "netlink-util.h"
26 #include "network-internal.h"
27 #include "ordered-set.h"
28 #include "parse-util.h"
29 #include "random-util.h"
30 #include "resolved-bus.h"
31 #include "resolved-conf.h"
32 #include "resolved-dns-stub.h"
33 #include "resolved-dnssd.h"
34 #include "resolved-etc-hosts.h"
35 #include "resolved-llmnr.h"
36 #include "resolved-manager.h"
37 #include "resolved-mdns.h"
38 #include "resolved-resolv-conf.h"
39 #include "resolved-varlink.h"
40 #include "socket-util.h"
41 #include "string-table.h"
42 #include "string-util.h"
45 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
47 static int manager_process_link(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
48 Manager
*m
= userdata
;
57 r
= sd_netlink_message_get_type(mm
, &type
);
61 r
= sd_rtnl_message_link_get_ifindex(mm
, &ifindex
);
65 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
73 r
= link_new(m
, &l
, ifindex
);
78 r
= link_process_rtnl(l
, mm
);
87 log_debug("Found new link %i/%s", ifindex
, l
->ifname
);
94 log_debug("Removing link %i/%s", l
->ifindex
, l
->ifname
);
105 log_warning_errno(r
, "Failed to process RTNL link message: %m");
109 static int manager_process_address(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
110 Manager
*m
= userdata
;
111 union in_addr_union address
;
113 int r
, ifindex
, family
;
121 r
= sd_netlink_message_get_type(mm
, &type
);
125 r
= sd_rtnl_message_addr_get_ifindex(mm
, &ifindex
);
129 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
133 r
= sd_rtnl_message_addr_get_family(mm
, &family
);
140 r
= sd_netlink_message_read_in_addr(mm
, IFA_LOCAL
, &address
.in
);
142 r
= sd_netlink_message_read_in_addr(mm
, IFA_ADDRESS
, &address
.in
);
150 r
= sd_netlink_message_read_in6_addr(mm
, IFA_LOCAL
, &address
.in6
);
152 r
= sd_netlink_message_read_in6_addr(mm
, IFA_ADDRESS
, &address
.in6
);
163 a
= link_find_address(l
, family
, &address
);
170 r
= link_address_new(l
, &a
, family
, &address
);
175 r
= link_address_update_rtnl(a
, mm
);
182 link_address_free(a
);
189 log_warning_errno(r
, "Failed to process RTNL address message: %m");
193 static int manager_rtnl_listen(Manager
*m
) {
194 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
, *reply
= NULL
;
195 sd_netlink_message
*i
;
200 /* First, subscribe to interfaces coming and going */
201 r
= sd_netlink_open(&m
->rtnl
);
205 r
= sd_netlink_attach_event(m
->rtnl
, m
->event
, SD_EVENT_PRIORITY_IMPORTANT
);
209 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_NEWLINK
, manager_process_link
, NULL
, m
, "resolve-NEWLINK");
213 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_DELLINK
, manager_process_link
, NULL
, m
, "resolve-DELLINK");
217 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_NEWADDR
, manager_process_address
, NULL
, m
, "resolve-NEWADDR");
221 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_DELADDR
, manager_process_address
, NULL
, m
, "resolve-DELADDR");
225 /* Then, enumerate all links */
226 r
= sd_rtnl_message_new_link(m
->rtnl
, &req
, RTM_GETLINK
, 0);
230 r
= sd_netlink_message_request_dump(req
, true);
234 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
238 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
239 r
= manager_process_link(m
->rtnl
, i
, m
);
244 req
= sd_netlink_message_unref(req
);
245 reply
= sd_netlink_message_unref(reply
);
247 /* Finally, enumerate all addresses, too */
248 r
= sd_rtnl_message_new_addr(m
->rtnl
, &req
, RTM_GETADDR
, 0, AF_UNSPEC
);
252 r
= sd_netlink_message_request_dump(req
, true);
256 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
260 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
261 r
= manager_process_address(m
->rtnl
, i
, m
);
269 static int on_network_event(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
270 Manager
*m
= userdata
;
277 sd_network_monitor_flush(m
->network_monitor
);
279 HASHMAP_FOREACH(l
, m
->links
, i
) {
282 log_warning_errno(r
, "Failed to update monitor information for %i: %m", l
->ifindex
);
285 (void) manager_write_resolv_conf(m
);
286 (void) manager_send_changed(m
, "DNS");
291 static int manager_network_monitor_listen(Manager
*m
) {
296 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
300 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
304 events
= sd_network_monitor_get_events(m
->network_monitor
);
308 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, &on_network_event
, m
);
312 r
= sd_event_source_set_priority(m
->network_event_source
, SD_EVENT_PRIORITY_IMPORTANT
+5);
316 (void) sd_event_source_set_description(m
->network_event_source
, "network-monitor");
321 static int determine_hostname(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
322 _cleanup_free_
char *h
= NULL
, *n
= NULL
;
324 _cleanup_free_
char *utf8
= NULL
;
328 char label
[DNS_LABEL_MAX
];
329 const char *p
, *decoded
;
332 assert(full_hostname
);
333 assert(llmnr_hostname
);
334 assert(mdns_hostname
);
336 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
338 r
= gethostname_strict(&h
);
340 return log_debug_errno(r
, "Can't determine system hostname: %m");
343 r
= dns_label_unescape(&p
, label
, sizeof label
, 0);
345 return log_error_errno(r
, "Failed to unescape hostname: %m");
347 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
348 "Couldn't find a single label in hostname.");
351 r
= idn2_to_unicode_8z8z(label
, &utf8
, 0);
353 return log_error("Failed to undo IDNA: %s", idn2_strerror(r
));
354 assert(utf8_is_valid(utf8
));
359 k
= dns_label_undo_idna(label
, r
, label
, sizeof label
);
361 return log_error_errno(k
, "Failed to undo IDNA: %m");
365 if (!utf8_is_valid(label
))
366 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
367 "System hostname is not UTF-8 clean.");
370 decoded
= label
; /* no decoding */
373 r
= dns_label_escape_new(decoded
, r
, &n
);
375 return log_error_errno(r
, "Failed to escape hostname: %m");
378 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
),
379 "System hostname is 'localhost', ignoring.");
381 r
= dns_name_concat(n
, "local", 0, mdns_hostname
);
383 return log_error_errno(r
, "Failed to determine mDNS hostname: %m");
385 *llmnr_hostname
= TAKE_PTR(n
);
386 *full_hostname
= TAKE_PTR(h
);
391 static const char *fallback_hostname(void) {
393 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
394 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
396 if (is_localhost(FALLBACK_HOSTNAME
))
399 return FALLBACK_HOSTNAME
;
402 static int make_fallback_hostnames(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
403 _cleanup_free_
char *n
= NULL
, *m
= NULL
;
404 char label
[DNS_LABEL_MAX
], *h
;
408 assert(full_hostname
);
409 assert(llmnr_hostname
);
410 assert(mdns_hostname
);
412 p
= fallback_hostname();
413 r
= dns_label_unescape(&p
, label
, sizeof label
, 0);
415 return log_error_errno(r
, "Failed to unescape fallback hostname: %m");
417 assert(r
> 0); /* The fallback hostname must have at least one label */
419 r
= dns_label_escape_new(label
, r
, &n
);
421 return log_error_errno(r
, "Failed to escape fallback hostname: %m");
423 r
= dns_name_concat(n
, "local", 0, &m
);
425 return log_error_errno(r
, "Failed to concatenate mDNS hostname: %m");
427 h
= strdup(fallback_hostname());
431 *llmnr_hostname
= TAKE_PTR(n
);
432 *mdns_hostname
= TAKE_PTR(m
);
439 static int on_hostname_change(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
440 _cleanup_free_
char *full_hostname
= NULL
, *llmnr_hostname
= NULL
, *mdns_hostname
= NULL
;
441 Manager
*m
= userdata
;
442 bool llmnr_hostname_changed
;
447 r
= determine_hostname(&full_hostname
, &llmnr_hostname
, &mdns_hostname
);
449 return 0; /* ignore invalid hostnames */
451 llmnr_hostname_changed
= !streq(llmnr_hostname
, m
->llmnr_hostname
);
452 if (streq(full_hostname
, m
->full_hostname
) &&
453 !llmnr_hostname_changed
&&
454 streq(mdns_hostname
, m
->mdns_hostname
))
457 log_info("System hostname changed to '%s'.", full_hostname
);
459 free_and_replace(m
->full_hostname
, full_hostname
);
460 free_and_replace(m
->llmnr_hostname
, llmnr_hostname
);
461 free_and_replace(m
->mdns_hostname
, mdns_hostname
);
463 manager_refresh_rrs(m
);
464 (void) manager_send_changed(m
, "LLMNRHostname");
469 static int manager_watch_hostname(Manager
*m
) {
474 m
->hostname_fd
= open("/proc/sys/kernel/hostname",
475 O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
476 if (m
->hostname_fd
< 0) {
477 log_warning_errno(errno
, "Failed to watch hostname: %m");
481 r
= sd_event_add_io(m
->event
, &m
->hostname_event_source
, m
->hostname_fd
, 0, on_hostname_change
, m
);
484 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
485 m
->hostname_fd
= safe_close(m
->hostname_fd
);
487 return log_error_errno(r
, "Failed to add hostname event source: %m");
490 (void) sd_event_source_set_description(m
->hostname_event_source
, "hostname");
492 r
= determine_hostname(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
494 log_info("Defaulting to hostname '%s'.", fallback_hostname());
496 r
= make_fallback_hostnames(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
500 log_info("Using system hostname '%s'.", m
->full_hostname
);
505 static int manager_sigusr1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
506 _cleanup_free_
char *buffer
= NULL
;
507 _cleanup_fclose_
FILE *f
= NULL
;
508 Manager
*m
= userdata
;
519 f
= open_memstream_unlocked(&buffer
, &size
);
523 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
524 dns_scope_dump(scope
, f
);
526 LIST_FOREACH(servers
, server
, m
->dns_servers
)
527 dns_server_dump(server
, f
);
528 LIST_FOREACH(servers
, server
, m
->fallback_dns_servers
)
529 dns_server_dump(server
, f
);
530 HASHMAP_FOREACH(l
, m
->links
, i
)
531 LIST_FOREACH(servers
, server
, l
->dns_servers
)
532 dns_server_dump(server
, f
);
534 if (fflush_and_check(f
) < 0)
537 log_dump(LOG_INFO
, buffer
);
541 static int manager_sigusr2(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
542 Manager
*m
= userdata
;
548 manager_flush_caches(m
);
553 static int manager_sigrtmin1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
554 Manager
*m
= userdata
;
560 manager_reset_server_features(m
);
564 int manager_new(Manager
**ret
) {
565 _cleanup_(manager_freep
) Manager
*m
= NULL
;
575 .llmnr_ipv4_udp_fd
= -1,
576 .llmnr_ipv6_udp_fd
= -1,
577 .llmnr_ipv4_tcp_fd
= -1,
578 .llmnr_ipv6_tcp_fd
= -1,
583 .llmnr_support
= DEFAULT_LLMNR_MODE
,
584 .mdns_support
= DEFAULT_MDNS_MODE
,
585 .dnssec_mode
= DEFAULT_DNSSEC_MODE
,
586 .dns_over_tls_mode
= DEFAULT_DNS_OVER_TLS_MODE
,
587 .enable_cache
= DNS_CACHE_MODE_YES
,
588 .dns_stub_listener_mode
= DNS_STUB_LISTENER_YES
,
589 .read_resolv_conf
= true,
590 .need_builtin_fallbacks
= true,
591 .etc_hosts_last
= USEC_INFINITY
,
592 .etc_hosts_mtime
= USEC_INFINITY
,
595 .read_etc_hosts
= true,
598 r
= dns_trust_anchor_load(&m
->trust_anchor
);
602 r
= manager_parse_config_file(m
);
604 log_warning_errno(r
, "Failed to parse configuration file: %m");
606 #if ENABLE_DNS_OVER_TLS
607 r
= dnstls_manager_init(m
);
612 r
= sd_event_default(&m
->event
);
616 (void) sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
617 (void) sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
619 (void) sd_event_set_watchdog(m
->event
, true);
621 r
= manager_watch_hostname(m
);
627 log_warning_errno(r
, "Failed to load DNS-SD configuration files: %m");
629 r
= dns_scope_new(m
, &m
->unicast_scope
, NULL
, DNS_PROTOCOL_DNS
, AF_UNSPEC
);
633 r
= manager_network_monitor_listen(m
);
637 r
= manager_rtnl_listen(m
);
641 r
= manager_connect_bus(m
);
645 (void) sd_event_add_signal(m
->event
, &m
->sigusr1_event_source
, SIGUSR1
, manager_sigusr1
, m
);
646 (void) sd_event_add_signal(m
->event
, &m
->sigusr2_event_source
, SIGUSR2
, manager_sigusr2
, m
);
647 (void) sd_event_add_signal(m
->event
, &m
->sigrtmin1_event_source
, SIGRTMIN
+1, manager_sigrtmin1
, m
);
649 manager_cleanup_saved_user(m
);
656 int manager_start(Manager
*m
) {
661 r
= manager_dns_stub_start(m
);
665 r
= manager_varlink_init(m
);
672 Manager
*manager_free(Manager
*m
) {
679 dns_server_unlink_all(m
->dns_servers
);
680 dns_server_unlink_all(m
->fallback_dns_servers
);
681 dns_search_domain_unlink_all(m
->search_domains
);
683 while ((l
= hashmap_first(m
->links
)))
686 while (m
->dns_queries
)
687 dns_query_free(m
->dns_queries
);
689 dns_scope_free(m
->unicast_scope
);
691 /* At this point only orphaned streams should remain. All others should have been freed already by their
693 while (m
->dns_streams
)
694 dns_stream_unref(m
->dns_streams
);
696 #if ENABLE_DNS_OVER_TLS
697 dnstls_manager_free(m
);
700 hashmap_free(m
->links
);
701 hashmap_free(m
->dns_transactions
);
703 sd_event_source_unref(m
->network_event_source
);
704 sd_network_monitor_unref(m
->network_monitor
);
706 sd_netlink_unref(m
->rtnl
);
707 sd_event_source_unref(m
->rtnl_event_source
);
709 manager_llmnr_stop(m
);
710 manager_mdns_stop(m
);
711 manager_dns_stub_stop(m
);
712 manager_varlink_done(m
);
714 ordered_set_free(m
->dns_extra_stub_listeners
);
716 bus_verify_polkit_async_registry_free(m
->polkit_registry
);
718 sd_bus_flush_close_unref(m
->bus
);
720 sd_event_source_unref(m
->sigusr1_event_source
);
721 sd_event_source_unref(m
->sigusr2_event_source
);
722 sd_event_source_unref(m
->sigrtmin1_event_source
);
724 sd_event_unref(m
->event
);
726 dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
727 dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
728 dns_resource_key_unref(m
->mdns_host_ipv4_key
);
729 dns_resource_key_unref(m
->mdns_host_ipv6_key
);
731 sd_event_source_unref(m
->hostname_event_source
);
732 safe_close(m
->hostname_fd
);
734 free(m
->full_hostname
);
735 free(m
->llmnr_hostname
);
736 free(m
->mdns_hostname
);
738 while ((s
= hashmap_first(m
->dnssd_services
)))
739 dnssd_service_free(s
);
740 hashmap_free(m
->dnssd_services
);
742 dns_trust_anchor_flush(&m
->trust_anchor
);
743 manager_etc_hosts_flush(m
);
748 int manager_recv(Manager
*m
, int fd
, DnsProtocol protocol
, DnsPacket
**ret
) {
749 _cleanup_(dns_packet_unrefp
) DnsPacket
*p
= NULL
;
750 CMSG_BUFFER_TYPE(CMSG_SPACE(MAXSIZE(struct in_pktinfo
, struct in6_pktinfo
))
751 + CMSG_SPACE(int) /* ttl/hoplimit */
752 + EXTRA_CMSG_SPACE
/* kernel appears to require extra buffer space */) control
;
753 union sockaddr_union sa
;
757 .msg_namelen
= sizeof(sa
),
760 .msg_control
= &control
,
761 .msg_controllen
= sizeof(control
),
763 struct cmsghdr
*cmsg
;
771 ms
= next_datagram_size_fd(fd
);
775 r
= dns_packet_new(&p
, protocol
, ms
, DNS_PACKET_SIZE_MAX
);
779 iov
= IOVEC_MAKE(DNS_PACKET_DATA(p
), p
->allocated
);
781 l
= recvmsg_safe(fd
, &mh
, 0);
782 if (IN_SET(l
, -EAGAIN
, -EINTR
))
789 assert(!(mh
.msg_flags
& MSG_TRUNC
));
791 p
->size
= (size_t) l
;
793 p
->family
= sa
.sa
.sa_family
;
794 p
->ipproto
= IPPROTO_UDP
;
795 if (p
->family
== AF_INET
) {
796 p
->sender
.in
= sa
.in
.sin_addr
;
797 p
->sender_port
= be16toh(sa
.in
.sin_port
);
798 } else if (p
->family
== AF_INET6
) {
799 p
->sender
.in6
= sa
.in6
.sin6_addr
;
800 p
->sender_port
= be16toh(sa
.in6
.sin6_port
);
801 p
->ifindex
= sa
.in6
.sin6_scope_id
;
803 return -EAFNOSUPPORT
;
805 CMSG_FOREACH(cmsg
, &mh
) {
807 if (cmsg
->cmsg_level
== IPPROTO_IPV6
) {
808 assert(p
->family
== AF_INET6
);
810 switch (cmsg
->cmsg_type
) {
813 struct in6_pktinfo
*i
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
816 p
->ifindex
= i
->ipi6_ifindex
;
818 p
->destination
.in6
= i
->ipi6_addr
;
823 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
827 } else if (cmsg
->cmsg_level
== IPPROTO_IP
) {
828 assert(p
->family
== AF_INET
);
830 switch (cmsg
->cmsg_type
) {
833 struct in_pktinfo
*i
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
836 p
->ifindex
= i
->ipi_ifindex
;
838 p
->destination
.in
= i
->ipi_addr
;
843 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
849 /* The Linux kernel sets the interface index to the loopback
850 * device if the packet came from the local host since it
851 * avoids the routing table in such a case. Let's unset the
852 * interface index in such a case. */
853 if (p
->ifindex
== LOOPBACK_IFINDEX
)
856 if (protocol
!= DNS_PROTOCOL_DNS
) {
857 /* If we don't know the interface index still, we look for the
858 * first local interface with a matching address. Yuck! */
860 p
->ifindex
= manager_find_ifindex(m
, p
->family
, &p
->destination
);
868 static int sendmsg_loop(int fd
, struct msghdr
*mh
, int flags
) {
875 if (sendmsg(fd
, mh
, flags
) >= 0)
884 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
892 static int write_loop(int fd
, void *message
, size_t length
) {
899 if (write(fd
, message
, length
) >= 0)
908 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
916 int manager_write(Manager
*m
, int fd
, DnsPacket
*p
) {
919 log_debug("Sending %s packet with id %" PRIu16
".", DNS_PACKET_QR(p
) ? "response" : "query", DNS_PACKET_ID(p
));
921 r
= write_loop(fd
, DNS_PACKET_DATA(p
), p
->size
);
928 static int manager_ipv4_send(
932 const struct in_addr
*destination
,
934 const struct in_addr
*source
,
937 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo
))) control
= {};
938 union sockaddr_union sa
;
944 .msg_namelen
= sizeof(sa
.in
),
953 iov
= IOVEC_MAKE(DNS_PACKET_DATA(p
), p
->size
);
955 sa
= (union sockaddr_union
) {
956 .in
.sin_family
= AF_INET
,
957 .in
.sin_addr
= *destination
,
958 .in
.sin_port
= htobe16(port
),
962 struct cmsghdr
*cmsg
;
963 struct in_pktinfo
*pi
;
965 mh
.msg_control
= &control
;
966 mh
.msg_controllen
= sizeof(control
);
968 cmsg
= CMSG_FIRSTHDR(&mh
);
969 cmsg
->cmsg_len
= CMSG_LEN(sizeof(struct in_pktinfo
));
970 cmsg
->cmsg_level
= IPPROTO_IP
;
971 cmsg
->cmsg_type
= IP_PKTINFO
;
973 pi
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
974 pi
->ipi_ifindex
= ifindex
;
977 pi
->ipi_spec_dst
= *source
;
980 return sendmsg_loop(fd
, &mh
, 0);
983 static int manager_ipv6_send(
987 const struct in6_addr
*destination
,
989 const struct in6_addr
*source
,
992 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in6_pktinfo
))) control
= {};
993 union sockaddr_union sa
;
999 .msg_namelen
= sizeof(sa
.in6
),
1004 assert(destination
);
1008 iov
= IOVEC_MAKE(DNS_PACKET_DATA(p
), p
->size
);
1010 sa
= (union sockaddr_union
) {
1011 .in6
.sin6_family
= AF_INET6
,
1012 .in6
.sin6_addr
= *destination
,
1013 .in6
.sin6_port
= htobe16(port
),
1014 .in6
.sin6_scope_id
= ifindex
,
1018 struct cmsghdr
*cmsg
;
1019 struct in6_pktinfo
*pi
;
1021 mh
.msg_control
= &control
;
1022 mh
.msg_controllen
= sizeof(control
);
1024 cmsg
= CMSG_FIRSTHDR(&mh
);
1025 cmsg
->cmsg_len
= CMSG_LEN(sizeof(struct in6_pktinfo
));
1026 cmsg
->cmsg_level
= IPPROTO_IPV6
;
1027 cmsg
->cmsg_type
= IPV6_PKTINFO
;
1029 pi
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
1030 pi
->ipi6_ifindex
= ifindex
;
1033 pi
->ipi6_addr
= *source
;
1036 return sendmsg_loop(fd
, &mh
, 0);
1044 const union in_addr_union
*destination
,
1046 const union in_addr_union
*source
,
1051 assert(destination
);
1055 log_debug("Sending %s packet with id %" PRIu16
" on interface %i/%s.", DNS_PACKET_QR(p
) ? "response" : "query", DNS_PACKET_ID(p
), ifindex
, af_to_name(family
));
1057 if (family
== AF_INET
)
1058 return manager_ipv4_send(m
, fd
, ifindex
, &destination
->in
, port
, source
? &source
->in
: NULL
, p
);
1059 if (family
== AF_INET6
)
1060 return manager_ipv6_send(m
, fd
, ifindex
, &destination
->in6
, port
, source
? &source
->in6
: NULL
, p
);
1062 return -EAFNOSUPPORT
;
1065 uint32_t manager_find_mtu(Manager
*m
) {
1070 /* If we don't know on which link a DNS packet would be
1071 * delivered, let's find the largest MTU that works on all
1072 * interfaces we know of */
1074 HASHMAP_FOREACH(l
, m
->links
, i
) {
1078 if (mtu
<= 0 || l
->mtu
< mtu
)
1085 int manager_find_ifindex(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1090 a
= manager_find_link_address(m
, family
, in_addr
);
1092 return a
->link
->ifindex
;
1097 void manager_refresh_rrs(Manager
*m
) {
1104 m
->llmnr_host_ipv4_key
= dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
1105 m
->llmnr_host_ipv6_key
= dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
1106 m
->mdns_host_ipv4_key
= dns_resource_key_unref(m
->mdns_host_ipv4_key
);
1107 m
->mdns_host_ipv6_key
= dns_resource_key_unref(m
->mdns_host_ipv6_key
);
1109 if (m
->mdns_support
== RESOLVE_SUPPORT_YES
)
1110 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
)
1111 if (dnssd_update_rrs(s
) < 0)
1112 log_warning("Failed to refresh DNS-SD service '%s'", s
->name
);
1114 HASHMAP_FOREACH(l
, m
->links
, i
) {
1115 link_add_rrs(l
, true);
1116 link_add_rrs(l
, false);
1120 static int manager_next_random_name(const char *old
, char **ret_new
) {
1129 if (!strchr(DIGITS
, p
[-1]))
1135 if (*p
== 0 || safe_atou64(p
, &u
) < 0 || u
<= 0)
1138 /* Add a random number to the old value. This way we can avoid
1139 * that two hosts pick the same hostname, win on IPv4 and lose
1140 * on IPv6 (or vice versa), and pick the same hostname
1141 * replacement hostname, ad infinitum. We still want the
1142 * numbers to go up monotonically, hence we just add a random
1145 random_bytes(&a
, sizeof(a
));
1148 if (asprintf(&n
, "%.*s%" PRIu64
, (int) (p
- old
), old
, u
) < 0)
1156 int manager_next_hostname(Manager
*m
) {
1157 _cleanup_free_
char *h
= NULL
, *k
= NULL
;
1162 r
= manager_next_random_name(m
->llmnr_hostname
, &h
);
1166 r
= dns_name_concat(h
, "local", 0, &k
);
1170 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m
->llmnr_hostname
, h
);
1172 free_and_replace(m
->llmnr_hostname
, h
);
1173 free_and_replace(m
->mdns_hostname
, k
);
1175 manager_refresh_rrs(m
);
1176 (void) manager_send_changed(m
, "LLMNRHostname");
1181 LinkAddress
* manager_find_link_address(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1187 HASHMAP_FOREACH(l
, m
->links
, i
) {
1190 a
= link_find_address(l
, family
, in_addr
);
1198 bool manager_our_packet(Manager
*m
, DnsPacket
*p
) {
1202 return !!manager_find_link_address(m
, p
->family
, &p
->sender
);
1205 DnsScope
* manager_find_scope(Manager
*m
, DnsPacket
*p
) {
1211 l
= hashmap_get(m
->links
, INT_TO_PTR(p
->ifindex
));
1215 switch (p
->protocol
) {
1216 case DNS_PROTOCOL_LLMNR
:
1217 if (p
->family
== AF_INET
)
1218 return l
->llmnr_ipv4_scope
;
1219 else if (p
->family
== AF_INET6
)
1220 return l
->llmnr_ipv6_scope
;
1224 case DNS_PROTOCOL_MDNS
:
1225 if (p
->family
== AF_INET
)
1226 return l
->mdns_ipv4_scope
;
1227 else if (p
->family
== AF_INET6
)
1228 return l
->mdns_ipv6_scope
;
1239 void manager_verify_all(Manager
*m
) {
1244 LIST_FOREACH(scopes
, s
, m
->dns_scopes
)
1245 dns_zone_verify_all(&s
->zone
);
1248 int manager_is_own_hostname(Manager
*m
, const char *name
) {
1254 if (m
->llmnr_hostname
) {
1255 r
= dns_name_equal(name
, m
->llmnr_hostname
);
1260 if (m
->mdns_hostname
) {
1261 r
= dns_name_equal(name
, m
->mdns_hostname
);
1266 if (m
->full_hostname
)
1267 return dns_name_equal(name
, m
->full_hostname
);
1272 int manager_compile_dns_servers(Manager
*m
, OrderedSet
**dns
) {
1281 r
= ordered_set_ensure_allocated(dns
, &dns_server_hash_ops
);
1285 /* First add the system-wide servers and domains */
1286 LIST_FOREACH(servers
, s
, m
->dns_servers
) {
1287 r
= ordered_set_put(*dns
, s
);
1294 /* Then, add the per-link servers */
1295 HASHMAP_FOREACH(l
, m
->links
, i
) {
1296 LIST_FOREACH(servers
, s
, l
->dns_servers
) {
1297 r
= ordered_set_put(*dns
, s
);
1305 /* If we found nothing, add the fallback servers */
1306 if (ordered_set_isempty(*dns
)) {
1307 LIST_FOREACH(servers
, s
, m
->fallback_dns_servers
) {
1308 r
= ordered_set_put(*dns
, s
);
1319 /* filter_route is a tri-state:
1321 * = 0 or false: return only domains which should be used for searching
1322 * > 0 or true: return only domains which are for routing only
1324 int manager_compile_search_domains(Manager
*m
, OrderedSet
**domains
, int filter_route
) {
1333 r
= ordered_set_ensure_allocated(domains
, &dns_name_hash_ops
);
1337 LIST_FOREACH(domains
, d
, m
->search_domains
) {
1339 if (filter_route
>= 0 &&
1340 d
->route_only
!= !!filter_route
)
1343 r
= ordered_set_put(*domains
, d
->name
);
1350 HASHMAP_FOREACH(l
, m
->links
, i
) {
1352 LIST_FOREACH(domains
, d
, l
->search_domains
) {
1354 if (filter_route
>= 0 &&
1355 d
->route_only
!= !!filter_route
)
1358 r
= ordered_set_put(*domains
, d
->name
);
1369 DnssecMode
manager_get_dnssec_mode(Manager
*m
) {
1372 if (m
->dnssec_mode
!= _DNSSEC_MODE_INVALID
)
1373 return m
->dnssec_mode
;
1378 bool manager_dnssec_supported(Manager
*m
) {
1385 if (manager_get_dnssec_mode(m
) == DNSSEC_NO
)
1388 server
= manager_get_dns_server(m
);
1389 if (server
&& !dns_server_dnssec_supported(server
))
1392 HASHMAP_FOREACH(l
, m
->links
, i
)
1393 if (!link_dnssec_supported(l
))
1399 DnsOverTlsMode
manager_get_dns_over_tls_mode(Manager
*m
) {
1402 if (m
->dns_over_tls_mode
!= _DNS_OVER_TLS_MODE_INVALID
)
1403 return m
->dns_over_tls_mode
;
1405 return DNS_OVER_TLS_NO
;
1408 void manager_dnssec_verdict(Manager
*m
, DnssecVerdict verdict
, const DnsResourceKey
*key
) {
1410 assert(verdict
>= 0);
1411 assert(verdict
< _DNSSEC_VERDICT_MAX
);
1413 if (DEBUG_LOGGING
) {
1414 char s
[DNS_RESOURCE_KEY_STRING_MAX
];
1416 log_debug("Found verdict for lookup %s: %s",
1417 dns_resource_key_to_string(key
, s
, sizeof s
),
1418 dnssec_verdict_to_string(verdict
));
1421 m
->n_dnssec_verdict
[verdict
]++;
1424 bool manager_routable(Manager
*m
, int family
) {
1430 /* Returns true if the host has at least one interface with a routable address of the specified type */
1432 HASHMAP_FOREACH(l
, m
->links
, i
)
1433 if (link_relevant(l
, family
, false))
1439 void manager_flush_caches(Manager
*m
) {
1444 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
1445 dns_cache_flush(&scope
->cache
);
1447 log_info("Flushed all caches.");
1450 void manager_reset_server_features(Manager
*m
) {
1454 dns_server_reset_features_all(m
->dns_servers
);
1455 dns_server_reset_features_all(m
->fallback_dns_servers
);
1457 HASHMAP_FOREACH(l
, m
->links
, i
)
1458 dns_server_reset_features_all(l
->dns_servers
);
1460 log_info("Resetting learnt feature levels on all servers.");
1463 void manager_cleanup_saved_user(Manager
*m
) {
1464 _cleanup_closedir_
DIR *d
= NULL
;
1469 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1470 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1471 * be restarted without losing this data. */
1473 d
= opendir("/run/systemd/resolve/netif/");
1475 if (errno
== ENOENT
)
1478 log_warning_errno(errno
, "Failed to open interface directory: %m");
1482 FOREACH_DIRENT_ALL(de
, d
, log_error_errno(errno
, "Failed to read interface directory: %m")) {
1483 _cleanup_free_
char *p
= NULL
;
1487 if (!IN_SET(de
->d_type
, DT_UNKNOWN
, DT_REG
))
1490 if (dot_or_dot_dot(de
->d_name
))
1493 ifindex
= parse_ifindex(de
->d_name
);
1494 if (ifindex
< 0) /* Probably some temporary file from a previous run. Delete it */
1497 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
1498 if (!l
) /* link vanished */
1501 if (l
->is_managed
) /* now managed by networkd, hence the bus settings are useless */
1507 p
= path_join("/run/systemd/resolve/netif", de
->d_name
);
1517 bool manager_next_dnssd_names(Manager
*m
) {
1525 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
) {
1526 _cleanup_free_
char * new_name
= NULL
;
1531 r
= manager_next_random_name(s
->name_template
, &new_name
);
1533 log_warning_errno(r
, "Failed to get new name for service '%s': %m", s
->name
);
1537 free_and_replace(s
->name_template
, new_name
);
1539 s
->withdrawn
= false;
1545 manager_refresh_rrs(m
);