1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 Copyright © 2014 Tom Gundersen <teg@jklm.no>
6 #include <netinet/in.h>
16 #include "alloc-util.h"
17 #include "dirent-util.h"
18 #include "dns-domain.h"
20 #include "fileio-label.h"
21 #include "hostname-util.h"
23 #include "netlink-util.h"
24 #include "network-internal.h"
25 #include "ordered-set.h"
26 #include "parse-util.h"
27 #include "random-util.h"
28 #include "resolved-bus.h"
29 #include "resolved-conf.h"
30 #include "resolved-dnssd.h"
31 #include "resolved-dns-stub.h"
32 #include "resolved-etc-hosts.h"
33 #include "resolved-llmnr.h"
34 #include "resolved-manager.h"
35 #include "resolved-mdns.h"
36 #include "resolved-resolv-conf.h"
37 #include "socket-util.h"
38 #include "string-table.h"
39 #include "string-util.h"
42 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
44 static int manager_process_link(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
45 Manager
*m
= userdata
;
54 r
= sd_netlink_message_get_type(mm
, &type
);
58 r
= sd_rtnl_message_link_get_ifindex(mm
, &ifindex
);
62 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
70 r
= link_new(m
, &l
, ifindex
);
75 r
= link_process_rtnl(l
, mm
);
84 log_debug("Found new link %i/%s", ifindex
, l
->name
);
91 log_debug("Removing link %i/%s", l
->ifindex
, l
->name
);
102 log_warning_errno(r
, "Failed to process RTNL link message: %m");
106 static int manager_process_address(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
107 Manager
*m
= userdata
;
108 union in_addr_union address
;
110 int r
, ifindex
, family
;
118 r
= sd_netlink_message_get_type(mm
, &type
);
122 r
= sd_rtnl_message_addr_get_ifindex(mm
, &ifindex
);
126 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
130 r
= sd_rtnl_message_addr_get_family(mm
, &family
);
137 r
= sd_netlink_message_read_in_addr(mm
, IFA_LOCAL
, &address
.in
);
139 r
= sd_netlink_message_read_in_addr(mm
, IFA_ADDRESS
, &address
.in
);
147 r
= sd_netlink_message_read_in6_addr(mm
, IFA_LOCAL
, &address
.in6
);
149 r
= sd_netlink_message_read_in6_addr(mm
, IFA_ADDRESS
, &address
.in6
);
160 a
= link_find_address(l
, family
, &address
);
167 r
= link_address_new(l
, &a
, family
, &address
);
172 r
= link_address_update_rtnl(a
, mm
);
179 link_address_free(a
);
186 log_warning_errno(r
, "Failed to process RTNL address message: %m");
190 static int manager_rtnl_listen(Manager
*m
) {
191 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
, *reply
= NULL
;
192 sd_netlink_message
*i
;
197 /* First, subscribe to interfaces coming and going */
198 r
= sd_netlink_open(&m
->rtnl
);
202 r
= sd_netlink_attach_event(m
->rtnl
, m
->event
, SD_EVENT_PRIORITY_IMPORTANT
);
206 r
= sd_netlink_add_match(m
->rtnl
, RTM_NEWLINK
, manager_process_link
, m
);
210 r
= sd_netlink_add_match(m
->rtnl
, RTM_DELLINK
, manager_process_link
, m
);
214 r
= sd_netlink_add_match(m
->rtnl
, RTM_NEWADDR
, manager_process_address
, m
);
218 r
= sd_netlink_add_match(m
->rtnl
, RTM_DELADDR
, manager_process_address
, m
);
222 /* Then, enumerate all links */
223 r
= sd_rtnl_message_new_link(m
->rtnl
, &req
, RTM_GETLINK
, 0);
227 r
= sd_netlink_message_request_dump(req
, true);
231 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
235 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
236 r
= manager_process_link(m
->rtnl
, i
, m
);
241 req
= sd_netlink_message_unref(req
);
242 reply
= sd_netlink_message_unref(reply
);
244 /* Finally, enumerate all addresses, too */
245 r
= sd_rtnl_message_new_addr(m
->rtnl
, &req
, RTM_GETADDR
, 0, AF_UNSPEC
);
249 r
= sd_netlink_message_request_dump(req
, true);
253 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
257 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
258 r
= manager_process_address(m
->rtnl
, i
, m
);
266 static int on_network_event(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
267 Manager
*m
= userdata
;
274 sd_network_monitor_flush(m
->network_monitor
);
276 HASHMAP_FOREACH(l
, m
->links
, i
) {
279 log_warning_errno(r
, "Failed to update monitor information for %i: %m", l
->ifindex
);
282 (void) manager_write_resolv_conf(m
);
287 static int manager_network_monitor_listen(Manager
*m
) {
292 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
296 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
300 events
= sd_network_monitor_get_events(m
->network_monitor
);
304 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, &on_network_event
, m
);
308 r
= sd_event_source_set_priority(m
->network_event_source
, SD_EVENT_PRIORITY_IMPORTANT
+5);
312 (void) sd_event_source_set_description(m
->network_event_source
, "network-monitor");
317 static int determine_hostname(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
318 _cleanup_free_
char *h
= NULL
, *n
= NULL
;
320 _cleanup_free_
char *utf8
= NULL
;
324 char label
[DNS_LABEL_MAX
];
325 const char *p
, *decoded
;
328 assert(full_hostname
);
329 assert(llmnr_hostname
);
330 assert(mdns_hostname
);
332 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
334 r
= gethostname_strict(&h
);
336 return log_debug_errno(r
, "Can't determine system hostname: %m");
339 r
= dns_label_unescape(&p
, label
, sizeof label
);
341 return log_error_errno(r
, "Failed to unescape host name: %m");
343 log_error("Couldn't find a single label in hostname.");
348 r
= idn2_to_unicode_8z8z(label
, &utf8
, 0);
350 return log_error("Failed to undo IDNA: %s", idn2_strerror(r
));
351 assert(utf8_is_valid(utf8
));
356 k
= dns_label_undo_idna(label
, r
, label
, sizeof label
);
358 return log_error_errno(k
, "Failed to undo IDNA: %m");
362 if (!utf8_is_valid(label
)) {
363 log_error("System hostname is not UTF-8 clean.");
368 decoded
= label
; /* no decoding */
371 r
= dns_label_escape_new(decoded
, r
, &n
);
373 return log_error_errno(r
, "Failed to escape host name: %m");
375 if (is_localhost(n
)) {
376 log_debug("System hostname is 'localhost', ignoring.");
380 r
= dns_name_concat(n
, "local", mdns_hostname
);
382 return log_error_errno(r
, "Failed to determine mDNS hostname: %m");
384 *llmnr_hostname
= TAKE_PTR(n
);
385 *full_hostname
= TAKE_PTR(h
);
390 static const char *fallback_hostname(void) {
392 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
393 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
395 if (is_localhost(FALLBACK_HOSTNAME
))
398 return FALLBACK_HOSTNAME
;
401 static int make_fallback_hostnames(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
402 _cleanup_free_
char *n
= NULL
, *m
= NULL
;
403 char label
[DNS_LABEL_MAX
], *h
;
407 assert(full_hostname
);
408 assert(llmnr_hostname
);
409 assert(mdns_hostname
);
411 p
= fallback_hostname();
412 r
= dns_label_unescape(&p
, label
, sizeof(label
));
414 return log_error_errno(r
, "Failed to unescape fallback host name: %m");
416 assert(r
> 0); /* The fallback hostname must have at least one label */
418 r
= dns_label_escape_new(label
, r
, &n
);
420 return log_error_errno(r
, "Failed to escape fallback hostname: %m");
422 r
= dns_name_concat(n
, "local", &m
);
424 return log_error_errno(r
, "Failed to concatenate mDNS hostname: %m");
426 h
= strdup(fallback_hostname());
430 *llmnr_hostname
= TAKE_PTR(n
);
431 *mdns_hostname
= TAKE_PTR(m
);
438 static int on_hostname_change(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
439 _cleanup_free_
char *full_hostname
= NULL
, *llmnr_hostname
= NULL
, *mdns_hostname
= NULL
;
440 Manager
*m
= userdata
;
445 r
= determine_hostname(&full_hostname
, &llmnr_hostname
, &mdns_hostname
);
447 return 0; /* ignore invalid hostnames */
449 if (streq(full_hostname
, m
->full_hostname
) &&
450 streq(llmnr_hostname
, m
->llmnr_hostname
) &&
451 streq(mdns_hostname
, m
->mdns_hostname
))
454 log_info("System hostname changed to '%s'.", full_hostname
);
456 free_and_replace(m
->full_hostname
, full_hostname
);
457 free_and_replace(m
->llmnr_hostname
, llmnr_hostname
);
458 free_and_replace(m
->mdns_hostname
, mdns_hostname
);
460 manager_refresh_rrs(m
);
465 static int manager_watch_hostname(Manager
*m
) {
470 m
->hostname_fd
= open("/proc/sys/kernel/hostname",
471 O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
472 if (m
->hostname_fd
< 0) {
473 log_warning_errno(errno
, "Failed to watch hostname: %m");
477 r
= sd_event_add_io(m
->event
, &m
->hostname_event_source
, m
->hostname_fd
, 0, on_hostname_change
, m
);
480 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
481 m
->hostname_fd
= safe_close(m
->hostname_fd
);
483 return log_error_errno(r
, "Failed to add hostname event source: %m");
486 (void) sd_event_source_set_description(m
->hostname_event_source
, "hostname");
488 r
= determine_hostname(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
490 log_info("Defaulting to hostname '%s'.", fallback_hostname());
492 r
= make_fallback_hostnames(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
496 log_info("Using system hostname '%s'.", m
->full_hostname
);
501 static int manager_sigusr1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
502 _cleanup_free_
char *buffer
= NULL
;
503 _cleanup_fclose_
FILE *f
= NULL
;
504 Manager
*m
= userdata
;
515 f
= open_memstream(&buffer
, &size
);
519 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
521 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
522 dns_scope_dump(scope
, f
);
524 LIST_FOREACH(servers
, server
, m
->dns_servers
)
525 dns_server_dump(server
, f
);
526 LIST_FOREACH(servers
, server
, m
->fallback_dns_servers
)
527 dns_server_dump(server
, f
);
528 HASHMAP_FOREACH(l
, m
->links
, i
)
529 LIST_FOREACH(servers
, server
, l
->dns_servers
)
530 dns_server_dump(server
, f
);
532 if (fflush_and_check(f
) < 0)
535 log_dump(LOG_INFO
, buffer
);
539 static int manager_sigusr2(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
540 Manager
*m
= userdata
;
546 manager_flush_caches(m
);
551 static int manager_sigrtmin1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
552 Manager
*m
= userdata
;
558 manager_reset_server_features(m
);
562 int manager_new(Manager
**ret
) {
563 _cleanup_(manager_freep
) Manager
*m
= NULL
;
568 m
= new0(Manager
, 1);
572 m
->llmnr_ipv4_udp_fd
= m
->llmnr_ipv6_udp_fd
= -1;
573 m
->llmnr_ipv4_tcp_fd
= m
->llmnr_ipv6_tcp_fd
= -1;
574 m
->mdns_ipv4_fd
= m
->mdns_ipv6_fd
= -1;
575 m
->dns_stub_udp_fd
= m
->dns_stub_tcp_fd
= -1;
578 m
->llmnr_support
= RESOLVE_SUPPORT_YES
;
579 m
->mdns_support
= RESOLVE_SUPPORT_YES
;
580 m
->dnssec_mode
= DEFAULT_DNSSEC_MODE
;
581 m
->dns_over_tls_mode
= DEFAULT_DNS_OVER_TLS_MODE
;
582 m
->enable_cache
= true;
583 m
->dns_stub_listener_mode
= DNS_STUB_LISTENER_UDP
;
584 m
->read_resolv_conf
= true;
585 m
->need_builtin_fallbacks
= true;
586 m
->etc_hosts_last
= m
->etc_hosts_mtime
= USEC_INFINITY
;
588 r
= dns_trust_anchor_load(&m
->trust_anchor
);
592 r
= manager_parse_config_file(m
);
594 log_warning_errno(r
, "Failed to parse configuration file: %m");
596 r
= sd_event_default(&m
->event
);
600 sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
601 sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
603 sd_event_set_watchdog(m
->event
, true);
605 r
= manager_watch_hostname(m
);
611 log_warning_errno(r
, "Failed to load DNS-SD configuration files: %m");
613 r
= dns_scope_new(m
, &m
->unicast_scope
, NULL
, DNS_PROTOCOL_DNS
, AF_UNSPEC
);
617 r
= manager_network_monitor_listen(m
);
621 r
= manager_rtnl_listen(m
);
625 r
= manager_connect_bus(m
);
629 (void) sd_event_add_signal(m
->event
, &m
->sigusr1_event_source
, SIGUSR1
, manager_sigusr1
, m
);
630 (void) sd_event_add_signal(m
->event
, &m
->sigusr2_event_source
, SIGUSR2
, manager_sigusr2
, m
);
631 (void) sd_event_add_signal(m
->event
, &m
->sigrtmin1_event_source
, SIGRTMIN
+1, manager_sigrtmin1
, m
);
633 manager_cleanup_saved_user(m
);
640 int manager_start(Manager
*m
) {
645 r
= manager_dns_stub_start(m
);
652 Manager
*manager_free(Manager
*m
) {
659 dns_server_unlink_all(m
->dns_servers
);
660 dns_server_unlink_all(m
->fallback_dns_servers
);
661 dns_search_domain_unlink_all(m
->search_domains
);
663 while ((l
= hashmap_first(m
->links
)))
666 while (m
->dns_queries
)
667 dns_query_free(m
->dns_queries
);
669 dns_scope_free(m
->unicast_scope
);
671 /* At this point only orphaned streams should remain. All others should have been freed already by their
673 while (m
->dns_streams
)
674 dns_stream_unref(m
->dns_streams
);
676 hashmap_free(m
->links
);
677 hashmap_free(m
->dns_transactions
);
679 sd_event_source_unref(m
->network_event_source
);
680 sd_network_monitor_unref(m
->network_monitor
);
682 sd_netlink_unref(m
->rtnl
);
683 sd_event_source_unref(m
->rtnl_event_source
);
685 manager_llmnr_stop(m
);
686 manager_mdns_stop(m
);
687 manager_dns_stub_stop(m
);
689 sd_bus_slot_unref(m
->prepare_for_sleep_slot
);
690 sd_bus_unref(m
->bus
);
692 sd_event_source_unref(m
->sigusr1_event_source
);
693 sd_event_source_unref(m
->sigusr2_event_source
);
694 sd_event_source_unref(m
->sigrtmin1_event_source
);
696 sd_event_unref(m
->event
);
698 dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
699 dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
700 dns_resource_key_unref(m
->mdns_host_ipv4_key
);
701 dns_resource_key_unref(m
->mdns_host_ipv6_key
);
703 sd_event_source_unref(m
->hostname_event_source
);
704 safe_close(m
->hostname_fd
);
706 free(m
->full_hostname
);
707 free(m
->llmnr_hostname
);
708 free(m
->mdns_hostname
);
710 while ((s
= hashmap_first(m
->dnssd_services
)))
711 dnssd_service_free(s
);
712 hashmap_free(m
->dnssd_services
);
714 dns_trust_anchor_flush(&m
->trust_anchor
);
715 manager_etc_hosts_flush(m
);
720 int manager_recv(Manager
*m
, int fd
, DnsProtocol protocol
, DnsPacket
**ret
) {
721 _cleanup_(dns_packet_unrefp
) DnsPacket
*p
= NULL
;
723 struct cmsghdr header
; /* For alignment */
724 uint8_t buffer
[CMSG_SPACE(MAXSIZE(struct in_pktinfo
, struct in6_pktinfo
))
725 + CMSG_SPACE(int) /* ttl/hoplimit */
726 + EXTRA_CMSG_SPACE
/* kernel appears to require extra buffer space */];
728 union sockaddr_union sa
;
729 struct msghdr mh
= {};
730 struct cmsghdr
*cmsg
;
739 ms
= next_datagram_size_fd(fd
);
743 r
= dns_packet_new(&p
, protocol
, ms
, DNS_PACKET_SIZE_MAX
);
747 iov
.iov_base
= DNS_PACKET_DATA(p
);
748 iov
.iov_len
= p
->allocated
;
750 mh
.msg_name
= &sa
.sa
;
751 mh
.msg_namelen
= sizeof(sa
);
754 mh
.msg_control
= &control
;
755 mh
.msg_controllen
= sizeof(control
);
757 l
= recvmsg(fd
, &mh
, 0);
761 if (IN_SET(errno
, EAGAIN
, EINTR
))
767 assert(!(mh
.msg_flags
& MSG_CTRUNC
));
768 assert(!(mh
.msg_flags
& MSG_TRUNC
));
770 p
->size
= (size_t) l
;
772 p
->family
= sa
.sa
.sa_family
;
773 p
->ipproto
= IPPROTO_UDP
;
774 if (p
->family
== AF_INET
) {
775 p
->sender
.in
= sa
.in
.sin_addr
;
776 p
->sender_port
= be16toh(sa
.in
.sin_port
);
777 } else if (p
->family
== AF_INET6
) {
778 p
->sender
.in6
= sa
.in6
.sin6_addr
;
779 p
->sender_port
= be16toh(sa
.in6
.sin6_port
);
780 p
->ifindex
= sa
.in6
.sin6_scope_id
;
782 return -EAFNOSUPPORT
;
784 CMSG_FOREACH(cmsg
, &mh
) {
786 if (cmsg
->cmsg_level
== IPPROTO_IPV6
) {
787 assert(p
->family
== AF_INET6
);
789 switch (cmsg
->cmsg_type
) {
792 struct in6_pktinfo
*i
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
795 p
->ifindex
= i
->ipi6_ifindex
;
797 p
->destination
.in6
= i
->ipi6_addr
;
802 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
806 } else if (cmsg
->cmsg_level
== IPPROTO_IP
) {
807 assert(p
->family
== AF_INET
);
809 switch (cmsg
->cmsg_type
) {
812 struct in_pktinfo
*i
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
815 p
->ifindex
= i
->ipi_ifindex
;
817 p
->destination
.in
= i
->ipi_addr
;
822 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
828 /* The Linux kernel sets the interface index to the loopback
829 * device if the packet came from the local host since it
830 * avoids the routing table in such a case. Let's unset the
831 * interface index in such a case. */
832 if (p
->ifindex
== LOOPBACK_IFINDEX
)
835 if (protocol
!= DNS_PROTOCOL_DNS
) {
836 /* If we don't know the interface index still, we look for the
837 * first local interface with a matching address. Yuck! */
839 p
->ifindex
= manager_find_ifindex(m
, p
->family
, &p
->destination
);
847 static int sendmsg_loop(int fd
, struct msghdr
*mh
, int flags
) {
854 if (sendmsg(fd
, mh
, flags
) >= 0)
863 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
871 static int write_loop(int fd
, void *message
, size_t length
) {
878 if (write(fd
, message
, length
) >= 0)
887 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
895 int manager_write(Manager
*m
, int fd
, DnsPacket
*p
) {
898 log_debug("Sending %s packet with id %" PRIu16
".", DNS_PACKET_QR(p
) ? "response" : "query", DNS_PACKET_ID(p
));
900 r
= write_loop(fd
, DNS_PACKET_DATA(p
), p
->size
);
907 static int manager_ipv4_send(
911 const struct in_addr
*destination
,
913 const struct in_addr
*source
,
915 union sockaddr_union sa
= {
916 .in
.sin_family
= AF_INET
,
919 struct cmsghdr header
; /* For alignment */
920 uint8_t buffer
[CMSG_SPACE(sizeof(struct in_pktinfo
))];
922 struct msghdr mh
= {};
931 iov
.iov_base
= DNS_PACKET_DATA(p
);
932 iov
.iov_len
= p
->size
;
934 sa
.in
.sin_addr
= *destination
;
935 sa
.in
.sin_port
= htobe16(port
),
939 mh
.msg_name
= &sa
.sa
;
940 mh
.msg_namelen
= sizeof(sa
.in
);
943 struct cmsghdr
*cmsg
;
944 struct in_pktinfo
*pi
;
948 mh
.msg_control
= &control
;
949 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
));
951 cmsg
= CMSG_FIRSTHDR(&mh
);
952 cmsg
->cmsg_len
= mh
.msg_controllen
;
953 cmsg
->cmsg_level
= IPPROTO_IP
;
954 cmsg
->cmsg_type
= IP_PKTINFO
;
956 pi
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
957 pi
->ipi_ifindex
= ifindex
;
960 pi
->ipi_spec_dst
= *source
;
963 return sendmsg_loop(fd
, &mh
, 0);
966 static int manager_ipv6_send(
970 const struct in6_addr
*destination
,
972 const struct in6_addr
*source
,
975 union sockaddr_union sa
= {
976 .in6
.sin6_family
= AF_INET6
,
979 struct cmsghdr header
; /* For alignment */
980 uint8_t buffer
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
982 struct msghdr mh
= {};
991 iov
.iov_base
= DNS_PACKET_DATA(p
);
992 iov
.iov_len
= p
->size
;
994 sa
.in6
.sin6_addr
= *destination
;
995 sa
.in6
.sin6_port
= htobe16(port
),
996 sa
.in6
.sin6_scope_id
= ifindex
;
1000 mh
.msg_name
= &sa
.sa
;
1001 mh
.msg_namelen
= sizeof(sa
.in6
);
1004 struct cmsghdr
*cmsg
;
1005 struct in6_pktinfo
*pi
;
1009 mh
.msg_control
= &control
;
1010 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
));
1012 cmsg
= CMSG_FIRSTHDR(&mh
);
1013 cmsg
->cmsg_len
= mh
.msg_controllen
;
1014 cmsg
->cmsg_level
= IPPROTO_IPV6
;
1015 cmsg
->cmsg_type
= IPV6_PKTINFO
;
1017 pi
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
1018 pi
->ipi6_ifindex
= ifindex
;
1021 pi
->ipi6_addr
= *source
;
1024 return sendmsg_loop(fd
, &mh
, 0);
1032 const union in_addr_union
*destination
,
1034 const union in_addr_union
*source
,
1039 assert(destination
);
1043 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
));
1045 if (family
== AF_INET
)
1046 return manager_ipv4_send(m
, fd
, ifindex
, &destination
->in
, port
, &source
->in
, p
);
1047 if (family
== AF_INET6
)
1048 return manager_ipv6_send(m
, fd
, ifindex
, &destination
->in6
, port
, &source
->in6
, p
);
1050 return -EAFNOSUPPORT
;
1053 uint32_t manager_find_mtu(Manager
*m
) {
1058 /* If we don't know on which link a DNS packet would be
1059 * delivered, let's find the largest MTU that works on all
1060 * interfaces we know of */
1062 HASHMAP_FOREACH(l
, m
->links
, i
) {
1066 if (mtu
<= 0 || l
->mtu
< mtu
)
1073 int manager_find_ifindex(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1078 a
= manager_find_link_address(m
, family
, in_addr
);
1080 return a
->link
->ifindex
;
1085 void manager_refresh_rrs(Manager
*m
) {
1092 m
->llmnr_host_ipv4_key
= dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
1093 m
->llmnr_host_ipv6_key
= dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
1094 m
->mdns_host_ipv4_key
= dns_resource_key_unref(m
->mdns_host_ipv4_key
);
1095 m
->mdns_host_ipv6_key
= dns_resource_key_unref(m
->mdns_host_ipv6_key
);
1097 if (m
->mdns_support
== RESOLVE_SUPPORT_YES
)
1098 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
)
1099 if (dnssd_update_rrs(s
) < 0)
1100 log_warning("Failed to refresh DNS-SD service '%s'", s
->name
);
1102 HASHMAP_FOREACH(l
, m
->links
, i
) {
1103 link_add_rrs(l
, true);
1104 link_add_rrs(l
, false);
1108 static int manager_next_random_name(const char *old
, char **ret_new
) {
1117 if (!strchr(DIGITS
, p
[-1]))
1123 if (*p
== 0 || safe_atou64(p
, &u
) < 0 || u
<= 0)
1126 /* Add a random number to the old value. This way we can avoid
1127 * that two hosts pick the same hostname, win on IPv4 and lose
1128 * on IPv6 (or vice versa), and pick the same hostname
1129 * replacement hostname, ad infinitum. We still want the
1130 * numbers to go up monotonically, hence we just add a random
1133 random_bytes(&a
, sizeof(a
));
1136 if (asprintf(&n
, "%.*s%" PRIu64
, (int) (p
- old
), old
, u
) < 0)
1144 int manager_next_hostname(Manager
*m
) {
1145 _cleanup_free_
char *h
= NULL
, *k
= NULL
;
1150 r
= manager_next_random_name(m
->llmnr_hostname
, &h
);
1154 r
= dns_name_concat(h
, "local", &k
);
1158 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m
->llmnr_hostname
, h
);
1160 free_and_replace(m
->llmnr_hostname
, h
);
1161 free_and_replace(m
->mdns_hostname
, k
);
1163 manager_refresh_rrs(m
);
1168 LinkAddress
* manager_find_link_address(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1174 HASHMAP_FOREACH(l
, m
->links
, i
) {
1177 a
= link_find_address(l
, family
, in_addr
);
1185 bool manager_our_packet(Manager
*m
, DnsPacket
*p
) {
1189 return !!manager_find_link_address(m
, p
->family
, &p
->sender
);
1192 DnsScope
* manager_find_scope(Manager
*m
, DnsPacket
*p
) {
1198 l
= hashmap_get(m
->links
, INT_TO_PTR(p
->ifindex
));
1202 switch (p
->protocol
) {
1203 case DNS_PROTOCOL_LLMNR
:
1204 if (p
->family
== AF_INET
)
1205 return l
->llmnr_ipv4_scope
;
1206 else if (p
->family
== AF_INET6
)
1207 return l
->llmnr_ipv6_scope
;
1211 case DNS_PROTOCOL_MDNS
:
1212 if (p
->family
== AF_INET
)
1213 return l
->mdns_ipv4_scope
;
1214 else if (p
->family
== AF_INET6
)
1215 return l
->mdns_ipv6_scope
;
1226 void manager_verify_all(Manager
*m
) {
1231 LIST_FOREACH(scopes
, s
, m
->dns_scopes
)
1232 dns_zone_verify_all(&s
->zone
);
1235 int manager_is_own_hostname(Manager
*m
, const char *name
) {
1241 if (m
->llmnr_hostname
) {
1242 r
= dns_name_equal(name
, m
->llmnr_hostname
);
1247 if (m
->mdns_hostname
) {
1248 r
= dns_name_equal(name
, m
->mdns_hostname
);
1253 if (m
->full_hostname
)
1254 return dns_name_equal(name
, m
->full_hostname
);
1259 int manager_compile_dns_servers(Manager
*m
, OrderedSet
**dns
) {
1268 r
= ordered_set_ensure_allocated(dns
, &dns_server_hash_ops
);
1272 /* First add the system-wide servers and domains */
1273 LIST_FOREACH(servers
, s
, m
->dns_servers
) {
1274 r
= ordered_set_put(*dns
, s
);
1281 /* Then, add the per-link servers */
1282 HASHMAP_FOREACH(l
, m
->links
, i
) {
1283 LIST_FOREACH(servers
, s
, l
->dns_servers
) {
1284 r
= ordered_set_put(*dns
, s
);
1292 /* If we found nothing, add the fallback servers */
1293 if (ordered_set_isempty(*dns
)) {
1294 LIST_FOREACH(servers
, s
, m
->fallback_dns_servers
) {
1295 r
= ordered_set_put(*dns
, s
);
1306 /* filter_route is a tri-state:
1308 * = 0 or false: return only domains which should be used for searching
1309 * > 0 or true: return only domains which are for routing only
1311 int manager_compile_search_domains(Manager
*m
, OrderedSet
**domains
, int filter_route
) {
1320 r
= ordered_set_ensure_allocated(domains
, &dns_name_hash_ops
);
1324 LIST_FOREACH(domains
, d
, m
->search_domains
) {
1326 if (filter_route
>= 0 &&
1327 d
->route_only
!= !!filter_route
)
1330 r
= ordered_set_put(*domains
, d
->name
);
1337 HASHMAP_FOREACH(l
, m
->links
, i
) {
1339 LIST_FOREACH(domains
, d
, l
->search_domains
) {
1341 if (filter_route
>= 0 &&
1342 d
->route_only
!= !!filter_route
)
1345 r
= ordered_set_put(*domains
, d
->name
);
1356 DnssecMode
manager_get_dnssec_mode(Manager
*m
) {
1359 if (m
->dnssec_mode
!= _DNSSEC_MODE_INVALID
)
1360 return m
->dnssec_mode
;
1365 bool manager_dnssec_supported(Manager
*m
) {
1372 if (manager_get_dnssec_mode(m
) == DNSSEC_NO
)
1375 server
= manager_get_dns_server(m
);
1376 if (server
&& !dns_server_dnssec_supported(server
))
1379 HASHMAP_FOREACH(l
, m
->links
, i
)
1380 if (!link_dnssec_supported(l
))
1386 DnsOverTlsMode
manager_get_dns_over_tls_mode(Manager
*m
) {
1389 if (m
->dns_over_tls_mode
!= _DNS_OVER_TLS_MODE_INVALID
)
1390 return m
->dns_over_tls_mode
;
1392 return DNS_OVER_TLS_NO
;
1395 void manager_dnssec_verdict(Manager
*m
, DnssecVerdict verdict
, const DnsResourceKey
*key
) {
1397 assert(verdict
>= 0);
1398 assert(verdict
< _DNSSEC_VERDICT_MAX
);
1400 if (DEBUG_LOGGING
) {
1401 char s
[DNS_RESOURCE_KEY_STRING_MAX
];
1403 log_debug("Found verdict for lookup %s: %s",
1404 dns_resource_key_to_string(key
, s
, sizeof s
),
1405 dnssec_verdict_to_string(verdict
));
1408 m
->n_dnssec_verdict
[verdict
]++;
1411 bool manager_routable(Manager
*m
, int family
) {
1417 /* Returns true if the host has at least one interface with a routable address of the specified type */
1419 HASHMAP_FOREACH(l
, m
->links
, i
)
1420 if (link_relevant(l
, family
, false))
1426 void manager_flush_caches(Manager
*m
) {
1431 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
1432 dns_cache_flush(&scope
->cache
);
1434 log_info("Flushed all caches.");
1437 void manager_reset_server_features(Manager
*m
) {
1441 dns_server_reset_features_all(m
->dns_servers
);
1442 dns_server_reset_features_all(m
->fallback_dns_servers
);
1444 HASHMAP_FOREACH(l
, m
->links
, i
)
1445 dns_server_reset_features_all(l
->dns_servers
);
1447 log_info("Resetting learnt feature levels on all servers.");
1450 void manager_cleanup_saved_user(Manager
*m
) {
1451 _cleanup_closedir_
DIR *d
= NULL
;
1457 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1458 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1459 * be restarted without losing this data. */
1461 d
= opendir("/run/systemd/resolve/netif/");
1463 if (errno
== ENOENT
)
1466 log_warning_errno(errno
, "Failed to open interface directory: %m");
1470 FOREACH_DIRENT_ALL(de
, d
, log_error_errno(errno
, "Failed to read interface directory: %m")) {
1471 _cleanup_free_
char *p
= NULL
;
1475 if (!IN_SET(de
->d_type
, DT_UNKNOWN
, DT_REG
))
1478 if (dot_or_dot_dot(de
->d_name
))
1481 r
= parse_ifindex(de
->d_name
, &ifindex
);
1482 if (r
< 0) /* Probably some temporary file from a previous run. Delete it */
1485 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
1486 if (!l
) /* link vanished */
1489 if (l
->is_managed
) /* now managed by networkd, hence the bus settings are useless */
1495 p
= strappend("/run/systemd/resolve/netif/", de
->d_name
);
1505 bool manager_next_dnssd_names(Manager
*m
) {
1513 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
) {
1514 _cleanup_free_
char * new_name
= NULL
;
1519 r
= manager_next_random_name(s
->name_template
, &new_name
);
1521 log_warning_errno(r
, "Failed to get new name for service '%s': %m", s
->name
);
1525 free_and_replace(s
->name_template
, new_name
);
1527 s
->withdrawn
= false;
1533 manager_refresh_rrs(m
);