1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 #include <netinet/in.h>
13 #include "alloc-util.h"
14 #include "dirent-util.h"
15 #include "dns-domain.h"
17 #include "fileio-label.h"
18 #include "hostname-util.h"
20 #include "netlink-util.h"
21 #include "network-internal.h"
22 #include "ordered-set.h"
23 #include "parse-util.h"
24 #include "random-util.h"
25 #include "resolved-bus.h"
26 #include "resolved-conf.h"
27 #include "resolved-dnssd.h"
28 #include "resolved-dns-stub.h"
29 #include "resolved-etc-hosts.h"
30 #include "resolved-llmnr.h"
31 #include "resolved-manager.h"
32 #include "resolved-mdns.h"
33 #include "resolved-resolv-conf.h"
34 #include "socket-util.h"
35 #include "string-table.h"
36 #include "string-util.h"
39 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
41 static int manager_process_link(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
42 Manager
*m
= userdata
;
51 r
= sd_netlink_message_get_type(mm
, &type
);
55 r
= sd_rtnl_message_link_get_ifindex(mm
, &ifindex
);
59 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
67 r
= link_new(m
, &l
, ifindex
);
72 r
= link_process_rtnl(l
, mm
);
81 log_debug("Found new link %i/%s", ifindex
, l
->name
);
88 log_debug("Removing link %i/%s", l
->ifindex
, l
->name
);
99 log_warning_errno(r
, "Failed to process RTNL link message: %m");
103 static int manager_process_address(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
104 Manager
*m
= userdata
;
105 union in_addr_union address
;
107 int r
, ifindex
, family
;
115 r
= sd_netlink_message_get_type(mm
, &type
);
119 r
= sd_rtnl_message_addr_get_ifindex(mm
, &ifindex
);
123 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
127 r
= sd_rtnl_message_addr_get_family(mm
, &family
);
134 r
= sd_netlink_message_read_in_addr(mm
, IFA_LOCAL
, &address
.in
);
136 r
= sd_netlink_message_read_in_addr(mm
, IFA_ADDRESS
, &address
.in
);
144 r
= sd_netlink_message_read_in6_addr(mm
, IFA_LOCAL
, &address
.in6
);
146 r
= sd_netlink_message_read_in6_addr(mm
, IFA_ADDRESS
, &address
.in6
);
157 a
= link_find_address(l
, family
, &address
);
164 r
= link_address_new(l
, &a
, family
, &address
);
169 r
= link_address_update_rtnl(a
, mm
);
176 link_address_free(a
);
183 log_warning_errno(r
, "Failed to process RTNL address message: %m");
187 static int manager_rtnl_listen(Manager
*m
) {
188 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
, *reply
= NULL
;
189 sd_netlink_message
*i
;
194 /* First, subscribe to interfaces coming and going */
195 r
= sd_netlink_open(&m
->rtnl
);
199 r
= sd_netlink_attach_event(m
->rtnl
, m
->event
, SD_EVENT_PRIORITY_IMPORTANT
);
203 r
= sd_netlink_add_match(m
->rtnl
, RTM_NEWLINK
, manager_process_link
, m
);
207 r
= sd_netlink_add_match(m
->rtnl
, RTM_DELLINK
, manager_process_link
, m
);
211 r
= sd_netlink_add_match(m
->rtnl
, RTM_NEWADDR
, manager_process_address
, m
);
215 r
= sd_netlink_add_match(m
->rtnl
, RTM_DELADDR
, manager_process_address
, m
);
219 /* Then, enumerate all links */
220 r
= sd_rtnl_message_new_link(m
->rtnl
, &req
, RTM_GETLINK
, 0);
224 r
= sd_netlink_message_request_dump(req
, true);
228 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
232 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
233 r
= manager_process_link(m
->rtnl
, i
, m
);
238 req
= sd_netlink_message_unref(req
);
239 reply
= sd_netlink_message_unref(reply
);
241 /* Finally, enumerate all addresses, too */
242 r
= sd_rtnl_message_new_addr(m
->rtnl
, &req
, RTM_GETADDR
, 0, AF_UNSPEC
);
246 r
= sd_netlink_message_request_dump(req
, true);
250 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
254 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
255 r
= manager_process_address(m
->rtnl
, i
, m
);
263 static int on_network_event(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
264 Manager
*m
= userdata
;
271 sd_network_monitor_flush(m
->network_monitor
);
273 HASHMAP_FOREACH(l
, m
->links
, i
) {
276 log_warning_errno(r
, "Failed to update monitor information for %i: %m", l
->ifindex
);
279 (void) manager_write_resolv_conf(m
);
284 static int manager_network_monitor_listen(Manager
*m
) {
289 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
293 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
297 events
= sd_network_monitor_get_events(m
->network_monitor
);
301 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, &on_network_event
, m
);
305 r
= sd_event_source_set_priority(m
->network_event_source
, SD_EVENT_PRIORITY_IMPORTANT
+5);
309 (void) sd_event_source_set_description(m
->network_event_source
, "network-monitor");
314 static int determine_hostname(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
315 _cleanup_free_
char *h
= NULL
, *n
= NULL
;
317 _cleanup_free_
char *utf8
= NULL
;
321 char label
[DNS_LABEL_MAX
];
322 const char *p
, *decoded
;
325 assert(full_hostname
);
326 assert(llmnr_hostname
);
327 assert(mdns_hostname
);
329 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
331 r
= gethostname_strict(&h
);
333 return log_debug_errno(r
, "Can't determine system hostname: %m");
336 r
= dns_label_unescape(&p
, label
, sizeof label
);
338 return log_error_errno(r
, "Failed to unescape host name: %m");
340 log_error("Couldn't find a single label in hostname.");
345 r
= idn2_to_unicode_8z8z(label
, &utf8
, 0);
347 return log_error("Failed to undo IDNA: %s", idn2_strerror(r
));
348 assert(utf8_is_valid(utf8
));
353 k
= dns_label_undo_idna(label
, r
, label
, sizeof label
);
355 return log_error_errno(k
, "Failed to undo IDNA: %m");
359 if (!utf8_is_valid(label
)) {
360 log_error("System hostname is not UTF-8 clean.");
365 decoded
= label
; /* no decoding */
368 r
= dns_label_escape_new(decoded
, r
, &n
);
370 return log_error_errno(r
, "Failed to escape host name: %m");
372 if (is_localhost(n
)) {
373 log_debug("System hostname is 'localhost', ignoring.");
377 r
= dns_name_concat(n
, "local", mdns_hostname
);
379 return log_error_errno(r
, "Failed to determine mDNS hostname: %m");
381 *llmnr_hostname
= TAKE_PTR(n
);
382 *full_hostname
= TAKE_PTR(h
);
387 static const char *fallback_hostname(void) {
389 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
390 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
392 if (is_localhost(FALLBACK_HOSTNAME
))
395 return FALLBACK_HOSTNAME
;
398 static int make_fallback_hostnames(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
399 _cleanup_free_
char *n
= NULL
, *m
= NULL
;
400 char label
[DNS_LABEL_MAX
], *h
;
404 assert(full_hostname
);
405 assert(llmnr_hostname
);
406 assert(mdns_hostname
);
408 p
= fallback_hostname();
409 r
= dns_label_unescape(&p
, label
, sizeof(label
));
411 return log_error_errno(r
, "Failed to unescape fallback host name: %m");
413 assert(r
> 0); /* The fallback hostname must have at least one label */
415 r
= dns_label_escape_new(label
, r
, &n
);
417 return log_error_errno(r
, "Failed to escape fallback hostname: %m");
419 r
= dns_name_concat(n
, "local", &m
);
421 return log_error_errno(r
, "Failed to concatenate mDNS hostname: %m");
423 h
= strdup(fallback_hostname());
427 *llmnr_hostname
= TAKE_PTR(n
);
428 *mdns_hostname
= TAKE_PTR(m
);
435 static int on_hostname_change(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
436 _cleanup_free_
char *full_hostname
= NULL
, *llmnr_hostname
= NULL
, *mdns_hostname
= NULL
;
437 Manager
*m
= userdata
;
442 r
= determine_hostname(&full_hostname
, &llmnr_hostname
, &mdns_hostname
);
444 return 0; /* ignore invalid hostnames */
446 if (streq(full_hostname
, m
->full_hostname
) &&
447 streq(llmnr_hostname
, m
->llmnr_hostname
) &&
448 streq(mdns_hostname
, m
->mdns_hostname
))
451 log_info("System hostname changed to '%s'.", full_hostname
);
453 free_and_replace(m
->full_hostname
, full_hostname
);
454 free_and_replace(m
->llmnr_hostname
, llmnr_hostname
);
455 free_and_replace(m
->mdns_hostname
, mdns_hostname
);
457 manager_refresh_rrs(m
);
462 static int manager_watch_hostname(Manager
*m
) {
467 m
->hostname_fd
= open("/proc/sys/kernel/hostname",
468 O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
469 if (m
->hostname_fd
< 0) {
470 log_warning_errno(errno
, "Failed to watch hostname: %m");
474 r
= sd_event_add_io(m
->event
, &m
->hostname_event_source
, m
->hostname_fd
, 0, on_hostname_change
, m
);
477 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
478 m
->hostname_fd
= safe_close(m
->hostname_fd
);
480 return log_error_errno(r
, "Failed to add hostname event source: %m");
483 (void) sd_event_source_set_description(m
->hostname_event_source
, "hostname");
485 r
= determine_hostname(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
487 log_info("Defaulting to hostname '%s'.", fallback_hostname());
489 r
= make_fallback_hostnames(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
493 log_info("Using system hostname '%s'.", m
->full_hostname
);
498 static int manager_sigusr1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
499 _cleanup_free_
char *buffer
= NULL
;
500 _cleanup_fclose_
FILE *f
= NULL
;
501 Manager
*m
= userdata
;
512 f
= open_memstream(&buffer
, &size
);
516 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
518 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
519 dns_scope_dump(scope
, f
);
521 LIST_FOREACH(servers
, server
, m
->dns_servers
)
522 dns_server_dump(server
, f
);
523 LIST_FOREACH(servers
, server
, m
->fallback_dns_servers
)
524 dns_server_dump(server
, f
);
525 HASHMAP_FOREACH(l
, m
->links
, i
)
526 LIST_FOREACH(servers
, server
, l
->dns_servers
)
527 dns_server_dump(server
, f
);
529 if (fflush_and_check(f
) < 0)
532 log_dump(LOG_INFO
, buffer
);
536 static int manager_sigusr2(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
537 Manager
*m
= userdata
;
543 manager_flush_caches(m
);
548 static int manager_sigrtmin1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
549 Manager
*m
= userdata
;
555 manager_reset_server_features(m
);
559 int manager_new(Manager
**ret
) {
560 _cleanup_(manager_freep
) Manager
*m
= NULL
;
565 m
= new0(Manager
, 1);
569 m
->llmnr_ipv4_udp_fd
= m
->llmnr_ipv6_udp_fd
= -1;
570 m
->llmnr_ipv4_tcp_fd
= m
->llmnr_ipv6_tcp_fd
= -1;
571 m
->mdns_ipv4_fd
= m
->mdns_ipv6_fd
= -1;
572 m
->dns_stub_udp_fd
= m
->dns_stub_tcp_fd
= -1;
575 m
->llmnr_support
= RESOLVE_SUPPORT_YES
;
576 m
->mdns_support
= RESOLVE_SUPPORT_YES
;
577 m
->dnssec_mode
= DEFAULT_DNSSEC_MODE
;
578 m
->dns_over_tls_mode
= DEFAULT_DNS_OVER_TLS_MODE
;
579 m
->enable_cache
= true;
580 m
->dns_stub_listener_mode
= DNS_STUB_LISTENER_UDP
;
581 m
->read_resolv_conf
= true;
582 m
->need_builtin_fallbacks
= true;
583 m
->etc_hosts_last
= m
->etc_hosts_mtime
= USEC_INFINITY
;
584 m
->read_etc_hosts
= true;
586 r
= dns_trust_anchor_load(&m
->trust_anchor
);
590 r
= manager_parse_config_file(m
);
592 log_warning_errno(r
, "Failed to parse configuration file: %m");
594 r
= sd_event_default(&m
->event
);
598 (void) sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
599 (void) sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
601 (void) sd_event_set_watchdog(m
->event
, true);
603 r
= manager_watch_hostname(m
);
609 log_warning_errno(r
, "Failed to load DNS-SD configuration files: %m");
611 r
= dns_scope_new(m
, &m
->unicast_scope
, NULL
, DNS_PROTOCOL_DNS
, AF_UNSPEC
);
615 r
= manager_network_monitor_listen(m
);
619 r
= manager_rtnl_listen(m
);
623 r
= manager_connect_bus(m
);
627 (void) sd_event_add_signal(m
->event
, &m
->sigusr1_event_source
, SIGUSR1
, manager_sigusr1
, m
);
628 (void) sd_event_add_signal(m
->event
, &m
->sigusr2_event_source
, SIGUSR2
, manager_sigusr2
, m
);
629 (void) sd_event_add_signal(m
->event
, &m
->sigrtmin1_event_source
, SIGRTMIN
+1, manager_sigrtmin1
, m
);
631 manager_cleanup_saved_user(m
);
638 int manager_start(Manager
*m
) {
643 r
= manager_dns_stub_start(m
);
650 Manager
*manager_free(Manager
*m
) {
657 dns_server_unlink_all(m
->dns_servers
);
658 dns_server_unlink_all(m
->fallback_dns_servers
);
659 dns_search_domain_unlink_all(m
->search_domains
);
661 while ((l
= hashmap_first(m
->links
)))
664 while (m
->dns_queries
)
665 dns_query_free(m
->dns_queries
);
667 dns_scope_free(m
->unicast_scope
);
669 /* At this point only orphaned streams should remain. All others should have been freed already by their
671 while (m
->dns_streams
)
672 dns_stream_unref(m
->dns_streams
);
674 hashmap_free(m
->links
);
675 hashmap_free(m
->dns_transactions
);
677 sd_event_source_unref(m
->network_event_source
);
678 sd_network_monitor_unref(m
->network_monitor
);
680 sd_netlink_unref(m
->rtnl
);
681 sd_event_source_unref(m
->rtnl_event_source
);
683 manager_llmnr_stop(m
);
684 manager_mdns_stop(m
);
685 manager_dns_stub_stop(m
);
687 sd_bus_unref(m
->bus
);
689 sd_event_source_unref(m
->sigusr1_event_source
);
690 sd_event_source_unref(m
->sigusr2_event_source
);
691 sd_event_source_unref(m
->sigrtmin1_event_source
);
693 sd_event_unref(m
->event
);
695 dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
696 dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
697 dns_resource_key_unref(m
->mdns_host_ipv4_key
);
698 dns_resource_key_unref(m
->mdns_host_ipv6_key
);
700 sd_event_source_unref(m
->hostname_event_source
);
701 safe_close(m
->hostname_fd
);
703 free(m
->full_hostname
);
704 free(m
->llmnr_hostname
);
705 free(m
->mdns_hostname
);
707 while ((s
= hashmap_first(m
->dnssd_services
)))
708 dnssd_service_free(s
);
709 hashmap_free(m
->dnssd_services
);
711 dns_trust_anchor_flush(&m
->trust_anchor
);
712 manager_etc_hosts_flush(m
);
717 int manager_recv(Manager
*m
, int fd
, DnsProtocol protocol
, DnsPacket
**ret
) {
718 _cleanup_(dns_packet_unrefp
) DnsPacket
*p
= NULL
;
720 struct cmsghdr header
; /* For alignment */
721 uint8_t buffer
[CMSG_SPACE(MAXSIZE(struct in_pktinfo
, struct in6_pktinfo
))
722 + CMSG_SPACE(int) /* ttl/hoplimit */
723 + EXTRA_CMSG_SPACE
/* kernel appears to require extra buffer space */];
725 union sockaddr_union sa
;
726 struct msghdr mh
= {};
727 struct cmsghdr
*cmsg
;
736 ms
= next_datagram_size_fd(fd
);
740 r
= dns_packet_new(&p
, protocol
, ms
, DNS_PACKET_SIZE_MAX
);
744 iov
.iov_base
= DNS_PACKET_DATA(p
);
745 iov
.iov_len
= p
->allocated
;
747 mh
.msg_name
= &sa
.sa
;
748 mh
.msg_namelen
= sizeof(sa
);
751 mh
.msg_control
= &control
;
752 mh
.msg_controllen
= sizeof(control
);
754 l
= recvmsg(fd
, &mh
, 0);
758 if (IN_SET(errno
, EAGAIN
, EINTR
))
764 assert(!(mh
.msg_flags
& MSG_CTRUNC
));
765 assert(!(mh
.msg_flags
& MSG_TRUNC
));
767 p
->size
= (size_t) l
;
769 p
->family
= sa
.sa
.sa_family
;
770 p
->ipproto
= IPPROTO_UDP
;
771 if (p
->family
== AF_INET
) {
772 p
->sender
.in
= sa
.in
.sin_addr
;
773 p
->sender_port
= be16toh(sa
.in
.sin_port
);
774 } else if (p
->family
== AF_INET6
) {
775 p
->sender
.in6
= sa
.in6
.sin6_addr
;
776 p
->sender_port
= be16toh(sa
.in6
.sin6_port
);
777 p
->ifindex
= sa
.in6
.sin6_scope_id
;
779 return -EAFNOSUPPORT
;
781 CMSG_FOREACH(cmsg
, &mh
) {
783 if (cmsg
->cmsg_level
== IPPROTO_IPV6
) {
784 assert(p
->family
== AF_INET6
);
786 switch (cmsg
->cmsg_type
) {
789 struct in6_pktinfo
*i
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
792 p
->ifindex
= i
->ipi6_ifindex
;
794 p
->destination
.in6
= i
->ipi6_addr
;
799 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
803 } else if (cmsg
->cmsg_level
== IPPROTO_IP
) {
804 assert(p
->family
== AF_INET
);
806 switch (cmsg
->cmsg_type
) {
809 struct in_pktinfo
*i
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
812 p
->ifindex
= i
->ipi_ifindex
;
814 p
->destination
.in
= i
->ipi_addr
;
819 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
825 /* The Linux kernel sets the interface index to the loopback
826 * device if the packet came from the local host since it
827 * avoids the routing table in such a case. Let's unset the
828 * interface index in such a case. */
829 if (p
->ifindex
== LOOPBACK_IFINDEX
)
832 if (protocol
!= DNS_PROTOCOL_DNS
) {
833 /* If we don't know the interface index still, we look for the
834 * first local interface with a matching address. Yuck! */
836 p
->ifindex
= manager_find_ifindex(m
, p
->family
, &p
->destination
);
844 static int sendmsg_loop(int fd
, struct msghdr
*mh
, int flags
) {
851 if (sendmsg(fd
, mh
, flags
) >= 0)
860 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
868 static int write_loop(int fd
, void *message
, size_t length
) {
875 if (write(fd
, message
, length
) >= 0)
884 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
892 int manager_write(Manager
*m
, int fd
, DnsPacket
*p
) {
895 log_debug("Sending %s packet with id %" PRIu16
".", DNS_PACKET_QR(p
) ? "response" : "query", DNS_PACKET_ID(p
));
897 r
= write_loop(fd
, DNS_PACKET_DATA(p
), p
->size
);
904 static int manager_ipv4_send(
908 const struct in_addr
*destination
,
910 const struct in_addr
*source
,
912 union sockaddr_union sa
= {
913 .in
.sin_family
= AF_INET
,
916 struct cmsghdr header
; /* For alignment */
917 uint8_t buffer
[CMSG_SPACE(sizeof(struct in_pktinfo
))];
919 struct msghdr mh
= {};
928 iov
.iov_base
= DNS_PACKET_DATA(p
);
929 iov
.iov_len
= p
->size
;
931 sa
.in
.sin_addr
= *destination
;
932 sa
.in
.sin_port
= htobe16(port
),
936 mh
.msg_name
= &sa
.sa
;
937 mh
.msg_namelen
= sizeof(sa
.in
);
940 struct cmsghdr
*cmsg
;
941 struct in_pktinfo
*pi
;
945 mh
.msg_control
= &control
;
946 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
));
948 cmsg
= CMSG_FIRSTHDR(&mh
);
949 cmsg
->cmsg_len
= mh
.msg_controllen
;
950 cmsg
->cmsg_level
= IPPROTO_IP
;
951 cmsg
->cmsg_type
= IP_PKTINFO
;
953 pi
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
954 pi
->ipi_ifindex
= ifindex
;
957 pi
->ipi_spec_dst
= *source
;
960 return sendmsg_loop(fd
, &mh
, 0);
963 static int manager_ipv6_send(
967 const struct in6_addr
*destination
,
969 const struct in6_addr
*source
,
972 union sockaddr_union sa
= {
973 .in6
.sin6_family
= AF_INET6
,
976 struct cmsghdr header
; /* For alignment */
977 uint8_t buffer
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
979 struct msghdr mh
= {};
988 iov
.iov_base
= DNS_PACKET_DATA(p
);
989 iov
.iov_len
= p
->size
;
991 sa
.in6
.sin6_addr
= *destination
;
992 sa
.in6
.sin6_port
= htobe16(port
),
993 sa
.in6
.sin6_scope_id
= ifindex
;
997 mh
.msg_name
= &sa
.sa
;
998 mh
.msg_namelen
= sizeof(sa
.in6
);
1001 struct cmsghdr
*cmsg
;
1002 struct in6_pktinfo
*pi
;
1006 mh
.msg_control
= &control
;
1007 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
));
1009 cmsg
= CMSG_FIRSTHDR(&mh
);
1010 cmsg
->cmsg_len
= mh
.msg_controllen
;
1011 cmsg
->cmsg_level
= IPPROTO_IPV6
;
1012 cmsg
->cmsg_type
= IPV6_PKTINFO
;
1014 pi
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
1015 pi
->ipi6_ifindex
= ifindex
;
1018 pi
->ipi6_addr
= *source
;
1021 return sendmsg_loop(fd
, &mh
, 0);
1029 const union in_addr_union
*destination
,
1031 const union in_addr_union
*source
,
1036 assert(destination
);
1040 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
));
1042 if (family
== AF_INET
)
1043 return manager_ipv4_send(m
, fd
, ifindex
, &destination
->in
, port
, &source
->in
, p
);
1044 if (family
== AF_INET6
)
1045 return manager_ipv6_send(m
, fd
, ifindex
, &destination
->in6
, port
, &source
->in6
, p
);
1047 return -EAFNOSUPPORT
;
1050 uint32_t manager_find_mtu(Manager
*m
) {
1055 /* If we don't know on which link a DNS packet would be
1056 * delivered, let's find the largest MTU that works on all
1057 * interfaces we know of */
1059 HASHMAP_FOREACH(l
, m
->links
, i
) {
1063 if (mtu
<= 0 || l
->mtu
< mtu
)
1070 int manager_find_ifindex(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1075 a
= manager_find_link_address(m
, family
, in_addr
);
1077 return a
->link
->ifindex
;
1082 void manager_refresh_rrs(Manager
*m
) {
1089 m
->llmnr_host_ipv4_key
= dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
1090 m
->llmnr_host_ipv6_key
= dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
1091 m
->mdns_host_ipv4_key
= dns_resource_key_unref(m
->mdns_host_ipv4_key
);
1092 m
->mdns_host_ipv6_key
= dns_resource_key_unref(m
->mdns_host_ipv6_key
);
1094 if (m
->mdns_support
== RESOLVE_SUPPORT_YES
)
1095 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
)
1096 if (dnssd_update_rrs(s
) < 0)
1097 log_warning("Failed to refresh DNS-SD service '%s'", s
->name
);
1099 HASHMAP_FOREACH(l
, m
->links
, i
) {
1100 link_add_rrs(l
, true);
1101 link_add_rrs(l
, false);
1105 static int manager_next_random_name(const char *old
, char **ret_new
) {
1114 if (!strchr(DIGITS
, p
[-1]))
1120 if (*p
== 0 || safe_atou64(p
, &u
) < 0 || u
<= 0)
1123 /* Add a random number to the old value. This way we can avoid
1124 * that two hosts pick the same hostname, win on IPv4 and lose
1125 * on IPv6 (or vice versa), and pick the same hostname
1126 * replacement hostname, ad infinitum. We still want the
1127 * numbers to go up monotonically, hence we just add a random
1130 random_bytes(&a
, sizeof(a
));
1133 if (asprintf(&n
, "%.*s%" PRIu64
, (int) (p
- old
), old
, u
) < 0)
1141 int manager_next_hostname(Manager
*m
) {
1142 _cleanup_free_
char *h
= NULL
, *k
= NULL
;
1147 r
= manager_next_random_name(m
->llmnr_hostname
, &h
);
1151 r
= dns_name_concat(h
, "local", &k
);
1155 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m
->llmnr_hostname
, h
);
1157 free_and_replace(m
->llmnr_hostname
, h
);
1158 free_and_replace(m
->mdns_hostname
, k
);
1160 manager_refresh_rrs(m
);
1165 LinkAddress
* manager_find_link_address(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1171 HASHMAP_FOREACH(l
, m
->links
, i
) {
1174 a
= link_find_address(l
, family
, in_addr
);
1182 bool manager_our_packet(Manager
*m
, DnsPacket
*p
) {
1186 return !!manager_find_link_address(m
, p
->family
, &p
->sender
);
1189 DnsScope
* manager_find_scope(Manager
*m
, DnsPacket
*p
) {
1195 l
= hashmap_get(m
->links
, INT_TO_PTR(p
->ifindex
));
1199 switch (p
->protocol
) {
1200 case DNS_PROTOCOL_LLMNR
:
1201 if (p
->family
== AF_INET
)
1202 return l
->llmnr_ipv4_scope
;
1203 else if (p
->family
== AF_INET6
)
1204 return l
->llmnr_ipv6_scope
;
1208 case DNS_PROTOCOL_MDNS
:
1209 if (p
->family
== AF_INET
)
1210 return l
->mdns_ipv4_scope
;
1211 else if (p
->family
== AF_INET6
)
1212 return l
->mdns_ipv6_scope
;
1223 void manager_verify_all(Manager
*m
) {
1228 LIST_FOREACH(scopes
, s
, m
->dns_scopes
)
1229 dns_zone_verify_all(&s
->zone
);
1232 int manager_is_own_hostname(Manager
*m
, const char *name
) {
1238 if (m
->llmnr_hostname
) {
1239 r
= dns_name_equal(name
, m
->llmnr_hostname
);
1244 if (m
->mdns_hostname
) {
1245 r
= dns_name_equal(name
, m
->mdns_hostname
);
1250 if (m
->full_hostname
)
1251 return dns_name_equal(name
, m
->full_hostname
);
1256 int manager_compile_dns_servers(Manager
*m
, OrderedSet
**dns
) {
1265 r
= ordered_set_ensure_allocated(dns
, &dns_server_hash_ops
);
1269 /* First add the system-wide servers and domains */
1270 LIST_FOREACH(servers
, s
, m
->dns_servers
) {
1271 r
= ordered_set_put(*dns
, s
);
1278 /* Then, add the per-link servers */
1279 HASHMAP_FOREACH(l
, m
->links
, i
) {
1280 LIST_FOREACH(servers
, s
, l
->dns_servers
) {
1281 r
= ordered_set_put(*dns
, s
);
1289 /* If we found nothing, add the fallback servers */
1290 if (ordered_set_isempty(*dns
)) {
1291 LIST_FOREACH(servers
, s
, m
->fallback_dns_servers
) {
1292 r
= ordered_set_put(*dns
, s
);
1303 /* filter_route is a tri-state:
1305 * = 0 or false: return only domains which should be used for searching
1306 * > 0 or true: return only domains which are for routing only
1308 int manager_compile_search_domains(Manager
*m
, OrderedSet
**domains
, int filter_route
) {
1317 r
= ordered_set_ensure_allocated(domains
, &dns_name_hash_ops
);
1321 LIST_FOREACH(domains
, d
, m
->search_domains
) {
1323 if (filter_route
>= 0 &&
1324 d
->route_only
!= !!filter_route
)
1327 r
= ordered_set_put(*domains
, d
->name
);
1334 HASHMAP_FOREACH(l
, m
->links
, i
) {
1336 LIST_FOREACH(domains
, d
, l
->search_domains
) {
1338 if (filter_route
>= 0 &&
1339 d
->route_only
!= !!filter_route
)
1342 r
= ordered_set_put(*domains
, d
->name
);
1353 DnssecMode
manager_get_dnssec_mode(Manager
*m
) {
1356 if (m
->dnssec_mode
!= _DNSSEC_MODE_INVALID
)
1357 return m
->dnssec_mode
;
1362 bool manager_dnssec_supported(Manager
*m
) {
1369 if (manager_get_dnssec_mode(m
) == DNSSEC_NO
)
1372 server
= manager_get_dns_server(m
);
1373 if (server
&& !dns_server_dnssec_supported(server
))
1376 HASHMAP_FOREACH(l
, m
->links
, i
)
1377 if (!link_dnssec_supported(l
))
1383 DnsOverTlsMode
manager_get_dns_over_tls_mode(Manager
*m
) {
1386 if (m
->dns_over_tls_mode
!= _DNS_OVER_TLS_MODE_INVALID
)
1387 return m
->dns_over_tls_mode
;
1389 return DNS_OVER_TLS_NO
;
1392 void manager_dnssec_verdict(Manager
*m
, DnssecVerdict verdict
, const DnsResourceKey
*key
) {
1394 assert(verdict
>= 0);
1395 assert(verdict
< _DNSSEC_VERDICT_MAX
);
1397 if (DEBUG_LOGGING
) {
1398 char s
[DNS_RESOURCE_KEY_STRING_MAX
];
1400 log_debug("Found verdict for lookup %s: %s",
1401 dns_resource_key_to_string(key
, s
, sizeof s
),
1402 dnssec_verdict_to_string(verdict
));
1405 m
->n_dnssec_verdict
[verdict
]++;
1408 bool manager_routable(Manager
*m
, int family
) {
1414 /* Returns true if the host has at least one interface with a routable address of the specified type */
1416 HASHMAP_FOREACH(l
, m
->links
, i
)
1417 if (link_relevant(l
, family
, false))
1423 void manager_flush_caches(Manager
*m
) {
1428 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
1429 dns_cache_flush(&scope
->cache
);
1431 log_info("Flushed all caches.");
1434 void manager_reset_server_features(Manager
*m
) {
1438 dns_server_reset_features_all(m
->dns_servers
);
1439 dns_server_reset_features_all(m
->fallback_dns_servers
);
1441 HASHMAP_FOREACH(l
, m
->links
, i
)
1442 dns_server_reset_features_all(l
->dns_servers
);
1444 log_info("Resetting learnt feature levels on all servers.");
1447 void manager_cleanup_saved_user(Manager
*m
) {
1448 _cleanup_closedir_
DIR *d
= NULL
;
1454 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1455 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1456 * be restarted without losing this data. */
1458 d
= opendir("/run/systemd/resolve/netif/");
1460 if (errno
== ENOENT
)
1463 log_warning_errno(errno
, "Failed to open interface directory: %m");
1467 FOREACH_DIRENT_ALL(de
, d
, log_error_errno(errno
, "Failed to read interface directory: %m")) {
1468 _cleanup_free_
char *p
= NULL
;
1472 if (!IN_SET(de
->d_type
, DT_UNKNOWN
, DT_REG
))
1475 if (dot_or_dot_dot(de
->d_name
))
1478 r
= parse_ifindex(de
->d_name
, &ifindex
);
1479 if (r
< 0) /* Probably some temporary file from a previous run. Delete it */
1482 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
1483 if (!l
) /* link vanished */
1486 if (l
->is_managed
) /* now managed by networkd, hence the bus settings are useless */
1492 p
= strappend("/run/systemd/resolve/netif/", de
->d_name
);
1502 bool manager_next_dnssd_names(Manager
*m
) {
1510 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
) {
1511 _cleanup_free_
char * new_name
= NULL
;
1516 r
= manager_next_random_name(s
->name_template
, &new_name
);
1518 log_warning_errno(r
, "Failed to get new name for service '%s': %m", s
->name
);
1522 free_and_replace(s
->name_template
, new_name
);
1524 s
->withdrawn
= false;
1530 manager_refresh_rrs(m
);