1 /* SPDX-License-Identifier: LGPL-2.1+ */
4 #include <netinet/in.h>
17 #include "alloc-util.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 "socket-util.h"
40 #include "string-table.h"
41 #include "string-util.h"
44 #define SEND_TIMEOUT_USEC (200 * USEC_PER_MSEC)
46 static int manager_process_link(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
47 Manager
*m
= userdata
;
56 r
= sd_netlink_message_get_type(mm
, &type
);
60 r
= sd_rtnl_message_link_get_ifindex(mm
, &ifindex
);
64 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
72 r
= link_new(m
, &l
, ifindex
);
77 r
= link_process_rtnl(l
, mm
);
86 log_debug("Found new link %i/%s", ifindex
, l
->name
);
93 log_debug("Removing link %i/%s", l
->ifindex
, l
->name
);
104 log_warning_errno(r
, "Failed to process RTNL link message: %m");
108 static int manager_process_address(sd_netlink
*rtnl
, sd_netlink_message
*mm
, void *userdata
) {
109 Manager
*m
= userdata
;
110 union in_addr_union address
;
112 int r
, ifindex
, family
;
120 r
= sd_netlink_message_get_type(mm
, &type
);
124 r
= sd_rtnl_message_addr_get_ifindex(mm
, &ifindex
);
128 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
132 r
= sd_rtnl_message_addr_get_family(mm
, &family
);
139 r
= sd_netlink_message_read_in_addr(mm
, IFA_LOCAL
, &address
.in
);
141 r
= sd_netlink_message_read_in_addr(mm
, IFA_ADDRESS
, &address
.in
);
149 r
= sd_netlink_message_read_in6_addr(mm
, IFA_LOCAL
, &address
.in6
);
151 r
= sd_netlink_message_read_in6_addr(mm
, IFA_ADDRESS
, &address
.in6
);
162 a
= link_find_address(l
, family
, &address
);
169 r
= link_address_new(l
, &a
, family
, &address
);
174 r
= link_address_update_rtnl(a
, mm
);
181 link_address_free(a
);
188 log_warning_errno(r
, "Failed to process RTNL address message: %m");
192 static int manager_rtnl_listen(Manager
*m
) {
193 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*req
= NULL
, *reply
= NULL
;
194 sd_netlink_message
*i
;
199 /* First, subscribe to interfaces coming and going */
200 r
= sd_netlink_open(&m
->rtnl
);
204 r
= sd_netlink_attach_event(m
->rtnl
, m
->event
, SD_EVENT_PRIORITY_IMPORTANT
);
208 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_NEWLINK
, manager_process_link
, NULL
, m
, "resolve-NEWLINK");
212 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_DELLINK
, manager_process_link
, NULL
, m
, "resolve-DELLINK");
216 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_NEWADDR
, manager_process_address
, NULL
, m
, "resolve-NEWADDR");
220 r
= sd_netlink_add_match(m
->rtnl
, NULL
, RTM_DELADDR
, manager_process_address
, NULL
, m
, "resolve-DELADDR");
224 /* Then, enumerate all links */
225 r
= sd_rtnl_message_new_link(m
->rtnl
, &req
, RTM_GETLINK
, 0);
229 r
= sd_netlink_message_request_dump(req
, true);
233 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
237 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
238 r
= manager_process_link(m
->rtnl
, i
, m
);
243 req
= sd_netlink_message_unref(req
);
244 reply
= sd_netlink_message_unref(reply
);
246 /* Finally, enumerate all addresses, too */
247 r
= sd_rtnl_message_new_addr(m
->rtnl
, &req
, RTM_GETADDR
, 0, AF_UNSPEC
);
251 r
= sd_netlink_message_request_dump(req
, true);
255 r
= sd_netlink_call(m
->rtnl
, req
, 0, &reply
);
259 for (i
= reply
; i
; i
= sd_netlink_message_next(i
)) {
260 r
= manager_process_address(m
->rtnl
, i
, m
);
268 static int on_network_event(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
269 Manager
*m
= userdata
;
276 sd_network_monitor_flush(m
->network_monitor
);
278 HASHMAP_FOREACH(l
, m
->links
, i
) {
281 log_warning_errno(r
, "Failed to update monitor information for %i: %m", l
->ifindex
);
284 (void) manager_write_resolv_conf(m
);
289 static int manager_network_monitor_listen(Manager
*m
) {
294 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
298 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
302 events
= sd_network_monitor_get_events(m
->network_monitor
);
306 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, &on_network_event
, m
);
310 r
= sd_event_source_set_priority(m
->network_event_source
, SD_EVENT_PRIORITY_IMPORTANT
+5);
314 (void) sd_event_source_set_description(m
->network_event_source
, "network-monitor");
319 static int determine_hostname(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
320 _cleanup_free_
char *h
= NULL
, *n
= NULL
;
322 _cleanup_free_
char *utf8
= NULL
;
326 char label
[DNS_LABEL_MAX
];
327 const char *p
, *decoded
;
330 assert(full_hostname
);
331 assert(llmnr_hostname
);
332 assert(mdns_hostname
);
334 /* Extract and normalize the first label of the locally configured hostname, and check it's not "localhost". */
336 r
= gethostname_strict(&h
);
338 return log_debug_errno(r
, "Can't determine system hostname: %m");
341 r
= dns_label_unescape(&p
, label
, sizeof label
, 0);
343 return log_error_errno(r
, "Failed to unescape host name: %m");
345 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
346 "Couldn't find a single label in hostname.");
349 r
= idn2_to_unicode_8z8z(label
, &utf8
, 0);
351 return log_error("Failed to undo IDNA: %s", idn2_strerror(r
));
352 assert(utf8_is_valid(utf8
));
357 k
= dns_label_undo_idna(label
, r
, label
, sizeof label
);
359 return log_error_errno(k
, "Failed to undo IDNA: %m");
363 if (!utf8_is_valid(label
))
364 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
365 "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");
376 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
),
377 "System hostname is 'localhost', ignoring.");
379 r
= dns_name_concat(n
, "local", 0, mdns_hostname
);
381 return log_error_errno(r
, "Failed to determine mDNS hostname: %m");
383 *llmnr_hostname
= TAKE_PTR(n
);
384 *full_hostname
= TAKE_PTR(h
);
389 static const char *fallback_hostname(void) {
391 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
392 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
394 if (is_localhost(FALLBACK_HOSTNAME
))
397 return FALLBACK_HOSTNAME
;
400 static int make_fallback_hostnames(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
401 _cleanup_free_
char *n
= NULL
, *m
= NULL
;
402 char label
[DNS_LABEL_MAX
], *h
;
406 assert(full_hostname
);
407 assert(llmnr_hostname
);
408 assert(mdns_hostname
);
410 p
= fallback_hostname();
411 r
= dns_label_unescape(&p
, label
, sizeof label
, 0);
413 return log_error_errno(r
, "Failed to unescape fallback host name: %m");
415 assert(r
> 0); /* The fallback hostname must have at least one label */
417 r
= dns_label_escape_new(label
, r
, &n
);
419 return log_error_errno(r
, "Failed to escape fallback hostname: %m");
421 r
= dns_name_concat(n
, "local", 0, &m
);
423 return log_error_errno(r
, "Failed to concatenate mDNS hostname: %m");
425 h
= strdup(fallback_hostname());
429 *llmnr_hostname
= TAKE_PTR(n
);
430 *mdns_hostname
= TAKE_PTR(m
);
437 static int on_hostname_change(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
438 _cleanup_free_
char *full_hostname
= NULL
, *llmnr_hostname
= NULL
, *mdns_hostname
= NULL
;
439 Manager
*m
= userdata
;
444 r
= determine_hostname(&full_hostname
, &llmnr_hostname
, &mdns_hostname
);
446 return 0; /* ignore invalid hostnames */
448 if (streq(full_hostname
, m
->full_hostname
) &&
449 streq(llmnr_hostname
, m
->llmnr_hostname
) &&
450 streq(mdns_hostname
, m
->mdns_hostname
))
453 log_info("System hostname changed to '%s'.", full_hostname
);
455 free_and_replace(m
->full_hostname
, full_hostname
);
456 free_and_replace(m
->llmnr_hostname
, llmnr_hostname
);
457 free_and_replace(m
->mdns_hostname
, mdns_hostname
);
459 manager_refresh_rrs(m
);
464 static int manager_watch_hostname(Manager
*m
) {
469 m
->hostname_fd
= open("/proc/sys/kernel/hostname",
470 O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
471 if (m
->hostname_fd
< 0) {
472 log_warning_errno(errno
, "Failed to watch hostname: %m");
476 r
= sd_event_add_io(m
->event
, &m
->hostname_event_source
, m
->hostname_fd
, 0, on_hostname_change
, m
);
479 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
480 m
->hostname_fd
= safe_close(m
->hostname_fd
);
482 return log_error_errno(r
, "Failed to add hostname event source: %m");
485 (void) sd_event_source_set_description(m
->hostname_event_source
, "hostname");
487 r
= determine_hostname(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
489 log_info("Defaulting to hostname '%s'.", fallback_hostname());
491 r
= make_fallback_hostnames(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
495 log_info("Using system hostname '%s'.", m
->full_hostname
);
500 static int manager_sigusr1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
501 _cleanup_free_
char *buffer
= NULL
;
502 _cleanup_fclose_
FILE *f
= NULL
;
503 Manager
*m
= userdata
;
514 f
= open_memstream(&buffer
, &size
);
518 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
520 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
521 dns_scope_dump(scope
, f
);
523 LIST_FOREACH(servers
, server
, m
->dns_servers
)
524 dns_server_dump(server
, f
);
525 LIST_FOREACH(servers
, server
, m
->fallback_dns_servers
)
526 dns_server_dump(server
, f
);
527 HASHMAP_FOREACH(l
, m
->links
, i
)
528 LIST_FOREACH(servers
, server
, l
->dns_servers
)
529 dns_server_dump(server
, f
);
531 if (fflush_and_check(f
) < 0)
534 log_dump(LOG_INFO
, buffer
);
538 static int manager_sigusr2(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
539 Manager
*m
= userdata
;
545 manager_flush_caches(m
);
550 static int manager_sigrtmin1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
551 Manager
*m
= userdata
;
557 manager_reset_server_features(m
);
561 int manager_new(Manager
**ret
) {
562 _cleanup_(manager_freep
) Manager
*m
= NULL
;
572 .llmnr_ipv4_udp_fd
= -1,
573 .llmnr_ipv6_udp_fd
= -1,
574 .llmnr_ipv4_tcp_fd
= -1,
575 .llmnr_ipv6_tcp_fd
= -1,
578 .dns_stub_udp_fd
= -1,
579 .dns_stub_tcp_fd
= -1,
582 .llmnr_support
= RESOLVE_SUPPORT_YES
,
583 .mdns_support
= RESOLVE_SUPPORT_YES
,
584 .dnssec_mode
= DEFAULT_DNSSEC_MODE
,
585 .dns_over_tls_mode
= DEFAULT_DNS_OVER_TLS_MODE
,
586 .enable_cache
= true,
587 .dns_stub_listener_mode
= DNS_STUB_LISTENER_YES
,
588 .read_resolv_conf
= true,
589 .need_builtin_fallbacks
= true,
590 .etc_hosts_last
= USEC_INFINITY
,
591 .etc_hosts_mtime
= USEC_INFINITY
,
592 .read_etc_hosts
= true,
595 r
= dns_trust_anchor_load(&m
->trust_anchor
);
599 r
= manager_parse_config_file(m
);
601 log_warning_errno(r
, "Failed to parse configuration file: %m");
603 r
= sd_event_default(&m
->event
);
607 (void) sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
608 (void) sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
610 (void) sd_event_set_watchdog(m
->event
, true);
612 r
= manager_watch_hostname(m
);
618 log_warning_errno(r
, "Failed to load DNS-SD configuration files: %m");
620 r
= dns_scope_new(m
, &m
->unicast_scope
, NULL
, DNS_PROTOCOL_DNS
, AF_UNSPEC
);
624 r
= manager_network_monitor_listen(m
);
628 r
= manager_rtnl_listen(m
);
632 r
= manager_connect_bus(m
);
636 (void) sd_event_add_signal(m
->event
, &m
->sigusr1_event_source
, SIGUSR1
, manager_sigusr1
, m
);
637 (void) sd_event_add_signal(m
->event
, &m
->sigusr2_event_source
, SIGUSR2
, manager_sigusr2
, m
);
638 (void) sd_event_add_signal(m
->event
, &m
->sigrtmin1_event_source
, SIGRTMIN
+1, manager_sigrtmin1
, m
);
640 manager_cleanup_saved_user(m
);
647 int manager_start(Manager
*m
) {
652 r
= manager_dns_stub_start(m
);
659 Manager
*manager_free(Manager
*m
) {
666 dns_server_unlink_all(m
->dns_servers
);
667 dns_server_unlink_all(m
->fallback_dns_servers
);
668 dns_search_domain_unlink_all(m
->search_domains
);
670 while ((l
= hashmap_first(m
->links
)))
673 while (m
->dns_queries
)
674 dns_query_free(m
->dns_queries
);
676 dns_scope_free(m
->unicast_scope
);
678 /* At this point only orphaned streams should remain. All others should have been freed already by their
680 while (m
->dns_streams
)
681 dns_stream_unref(m
->dns_streams
);
683 hashmap_free(m
->links
);
684 hashmap_free(m
->dns_transactions
);
686 sd_event_source_unref(m
->network_event_source
);
687 sd_network_monitor_unref(m
->network_monitor
);
689 sd_netlink_unref(m
->rtnl
);
690 sd_event_source_unref(m
->rtnl_event_source
);
692 manager_llmnr_stop(m
);
693 manager_mdns_stop(m
);
694 manager_dns_stub_stop(m
);
696 sd_bus_flush_close_unref(m
->bus
);
698 sd_event_source_unref(m
->sigusr1_event_source
);
699 sd_event_source_unref(m
->sigusr2_event_source
);
700 sd_event_source_unref(m
->sigrtmin1_event_source
);
702 sd_event_unref(m
->event
);
704 dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
705 dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
706 dns_resource_key_unref(m
->mdns_host_ipv4_key
);
707 dns_resource_key_unref(m
->mdns_host_ipv6_key
);
709 sd_event_source_unref(m
->hostname_event_source
);
710 safe_close(m
->hostname_fd
);
712 free(m
->full_hostname
);
713 free(m
->llmnr_hostname
);
714 free(m
->mdns_hostname
);
716 while ((s
= hashmap_first(m
->dnssd_services
)))
717 dnssd_service_free(s
);
718 hashmap_free(m
->dnssd_services
);
720 dns_trust_anchor_flush(&m
->trust_anchor
);
721 manager_etc_hosts_flush(m
);
726 int manager_recv(Manager
*m
, int fd
, DnsProtocol protocol
, DnsPacket
**ret
) {
727 _cleanup_(dns_packet_unrefp
) DnsPacket
*p
= NULL
;
729 struct cmsghdr header
; /* For alignment */
730 uint8_t buffer
[CMSG_SPACE(MAXSIZE(struct in_pktinfo
, struct in6_pktinfo
))
731 + CMSG_SPACE(int) /* ttl/hoplimit */
732 + EXTRA_CMSG_SPACE
/* kernel appears to require extra buffer space */];
734 union sockaddr_union sa
;
738 .msg_namelen
= sizeof(sa
),
741 .msg_control
= &control
,
742 .msg_controllen
= sizeof(control
),
744 struct cmsghdr
*cmsg
;
752 ms
= next_datagram_size_fd(fd
);
756 r
= dns_packet_new(&p
, protocol
, ms
, DNS_PACKET_SIZE_MAX
);
760 iov
= IOVEC_MAKE(DNS_PACKET_DATA(p
), p
->allocated
);
762 l
= recvmsg(fd
, &mh
, 0);
764 if (IN_SET(errno
, EAGAIN
, EINTR
))
772 assert(!(mh
.msg_flags
& MSG_CTRUNC
));
773 assert(!(mh
.msg_flags
& MSG_TRUNC
));
775 p
->size
= (size_t) l
;
777 p
->family
= sa
.sa
.sa_family
;
778 p
->ipproto
= IPPROTO_UDP
;
779 if (p
->family
== AF_INET
) {
780 p
->sender
.in
= sa
.in
.sin_addr
;
781 p
->sender_port
= be16toh(sa
.in
.sin_port
);
782 } else if (p
->family
== AF_INET6
) {
783 p
->sender
.in6
= sa
.in6
.sin6_addr
;
784 p
->sender_port
= be16toh(sa
.in6
.sin6_port
);
785 p
->ifindex
= sa
.in6
.sin6_scope_id
;
787 return -EAFNOSUPPORT
;
789 CMSG_FOREACH(cmsg
, &mh
) {
791 if (cmsg
->cmsg_level
== IPPROTO_IPV6
) {
792 assert(p
->family
== AF_INET6
);
794 switch (cmsg
->cmsg_type
) {
797 struct in6_pktinfo
*i
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
800 p
->ifindex
= i
->ipi6_ifindex
;
802 p
->destination
.in6
= i
->ipi6_addr
;
807 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
811 } else if (cmsg
->cmsg_level
== IPPROTO_IP
) {
812 assert(p
->family
== AF_INET
);
814 switch (cmsg
->cmsg_type
) {
817 struct in_pktinfo
*i
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
820 p
->ifindex
= i
->ipi_ifindex
;
822 p
->destination
.in
= i
->ipi_addr
;
827 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
833 /* The Linux kernel sets the interface index to the loopback
834 * device if the packet came from the local host since it
835 * avoids the routing table in such a case. Let's unset the
836 * interface index in such a case. */
837 if (p
->ifindex
== LOOPBACK_IFINDEX
)
840 if (protocol
!= DNS_PROTOCOL_DNS
) {
841 /* If we don't know the interface index still, we look for the
842 * first local interface with a matching address. Yuck! */
844 p
->ifindex
= manager_find_ifindex(m
, p
->family
, &p
->destination
);
852 static int sendmsg_loop(int fd
, struct msghdr
*mh
, int flags
) {
859 if (sendmsg(fd
, mh
, flags
) >= 0)
868 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
876 static int write_loop(int fd
, void *message
, size_t length
) {
883 if (write(fd
, message
, length
) >= 0)
892 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
900 int manager_write(Manager
*m
, int fd
, DnsPacket
*p
) {
903 log_debug("Sending %s packet with id %" PRIu16
".", DNS_PACKET_QR(p
) ? "response" : "query", DNS_PACKET_ID(p
));
905 r
= write_loop(fd
, DNS_PACKET_DATA(p
), p
->size
);
912 static int manager_ipv4_send(
916 const struct in_addr
*destination
,
918 const struct in_addr
*source
,
921 struct cmsghdr header
; /* For alignment */
922 uint8_t buffer
[CMSG_SPACE(sizeof(struct in_pktinfo
))];
924 union sockaddr_union sa
;
930 .msg_namelen
= sizeof(sa
.in
),
939 iov
= IOVEC_MAKE(DNS_PACKET_DATA(p
), p
->size
);
941 sa
= (union sockaddr_union
) {
942 .in
.sin_family
= AF_INET
,
943 .in
.sin_addr
= *destination
,
944 .in
.sin_port
= htobe16(port
),
948 struct cmsghdr
*cmsg
;
949 struct in_pktinfo
*pi
;
951 mh
.msg_control
= &control
;
952 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
));
954 cmsg
= CMSG_FIRSTHDR(&mh
);
955 cmsg
->cmsg_len
= mh
.msg_controllen
;
956 cmsg
->cmsg_level
= IPPROTO_IP
;
957 cmsg
->cmsg_type
= IP_PKTINFO
;
959 pi
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
960 pi
->ipi_ifindex
= ifindex
;
963 pi
->ipi_spec_dst
= *source
;
966 return sendmsg_loop(fd
, &mh
, 0);
969 static int manager_ipv6_send(
973 const struct in6_addr
*destination
,
975 const struct in6_addr
*source
,
979 struct cmsghdr header
; /* For alignment */
980 uint8_t buffer
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
982 union sockaddr_union sa
;
988 .msg_namelen
= sizeof(sa
.in6
),
997 iov
= IOVEC_MAKE(DNS_PACKET_DATA(p
), p
->size
);
999 sa
= (union sockaddr_union
) {
1000 .in6
.sin6_family
= AF_INET6
,
1001 .in6
.sin6_addr
= *destination
,
1002 .in6
.sin6_port
= htobe16(port
),
1003 .in6
.sin6_scope_id
= ifindex
,
1007 struct cmsghdr
*cmsg
;
1008 struct in6_pktinfo
*pi
;
1010 mh
.msg_control
= &control
;
1011 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
));
1013 cmsg
= CMSG_FIRSTHDR(&mh
);
1014 cmsg
->cmsg_len
= mh
.msg_controllen
;
1015 cmsg
->cmsg_level
= IPPROTO_IPV6
;
1016 cmsg
->cmsg_type
= IPV6_PKTINFO
;
1018 pi
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
1019 pi
->ipi6_ifindex
= ifindex
;
1022 pi
->ipi6_addr
= *source
;
1025 return sendmsg_loop(fd
, &mh
, 0);
1033 const union in_addr_union
*destination
,
1035 const union in_addr_union
*source
,
1040 assert(destination
);
1044 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
));
1046 if (family
== AF_INET
)
1047 return manager_ipv4_send(m
, fd
, ifindex
, &destination
->in
, port
, source
? &source
->in
: NULL
, p
);
1048 if (family
== AF_INET6
)
1049 return manager_ipv6_send(m
, fd
, ifindex
, &destination
->in6
, port
, source
? &source
->in6
: NULL
, p
);
1051 return -EAFNOSUPPORT
;
1054 uint32_t manager_find_mtu(Manager
*m
) {
1059 /* If we don't know on which link a DNS packet would be
1060 * delivered, let's find the largest MTU that works on all
1061 * interfaces we know of */
1063 HASHMAP_FOREACH(l
, m
->links
, i
) {
1067 if (mtu
<= 0 || l
->mtu
< mtu
)
1074 int manager_find_ifindex(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1079 a
= manager_find_link_address(m
, family
, in_addr
);
1081 return a
->link
->ifindex
;
1086 void manager_refresh_rrs(Manager
*m
) {
1093 m
->llmnr_host_ipv4_key
= dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
1094 m
->llmnr_host_ipv6_key
= dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
1095 m
->mdns_host_ipv4_key
= dns_resource_key_unref(m
->mdns_host_ipv4_key
);
1096 m
->mdns_host_ipv6_key
= dns_resource_key_unref(m
->mdns_host_ipv6_key
);
1098 if (m
->mdns_support
== RESOLVE_SUPPORT_YES
)
1099 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
)
1100 if (dnssd_update_rrs(s
) < 0)
1101 log_warning("Failed to refresh DNS-SD service '%s'", s
->name
);
1103 HASHMAP_FOREACH(l
, m
->links
, i
) {
1104 link_add_rrs(l
, true);
1105 link_add_rrs(l
, false);
1109 static int manager_next_random_name(const char *old
, char **ret_new
) {
1118 if (!strchr(DIGITS
, p
[-1]))
1124 if (*p
== 0 || safe_atou64(p
, &u
) < 0 || u
<= 0)
1127 /* Add a random number to the old value. This way we can avoid
1128 * that two hosts pick the same hostname, win on IPv4 and lose
1129 * on IPv6 (or vice versa), and pick the same hostname
1130 * replacement hostname, ad infinitum. We still want the
1131 * numbers to go up monotonically, hence we just add a random
1134 random_bytes(&a
, sizeof(a
));
1137 if (asprintf(&n
, "%.*s%" PRIu64
, (int) (p
- old
), old
, u
) < 0)
1145 int manager_next_hostname(Manager
*m
) {
1146 _cleanup_free_
char *h
= NULL
, *k
= NULL
;
1151 r
= manager_next_random_name(m
->llmnr_hostname
, &h
);
1155 r
= dns_name_concat(h
, "local", 0, &k
);
1159 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m
->llmnr_hostname
, h
);
1161 free_and_replace(m
->llmnr_hostname
, h
);
1162 free_and_replace(m
->mdns_hostname
, k
);
1164 manager_refresh_rrs(m
);
1169 LinkAddress
* manager_find_link_address(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1175 HASHMAP_FOREACH(l
, m
->links
, i
) {
1178 a
= link_find_address(l
, family
, in_addr
);
1186 bool manager_our_packet(Manager
*m
, DnsPacket
*p
) {
1190 return !!manager_find_link_address(m
, p
->family
, &p
->sender
);
1193 DnsScope
* manager_find_scope(Manager
*m
, DnsPacket
*p
) {
1199 l
= hashmap_get(m
->links
, INT_TO_PTR(p
->ifindex
));
1203 switch (p
->protocol
) {
1204 case DNS_PROTOCOL_LLMNR
:
1205 if (p
->family
== AF_INET
)
1206 return l
->llmnr_ipv4_scope
;
1207 else if (p
->family
== AF_INET6
)
1208 return l
->llmnr_ipv6_scope
;
1212 case DNS_PROTOCOL_MDNS
:
1213 if (p
->family
== AF_INET
)
1214 return l
->mdns_ipv4_scope
;
1215 else if (p
->family
== AF_INET6
)
1216 return l
->mdns_ipv6_scope
;
1227 void manager_verify_all(Manager
*m
) {
1232 LIST_FOREACH(scopes
, s
, m
->dns_scopes
)
1233 dns_zone_verify_all(&s
->zone
);
1236 int manager_is_own_hostname(Manager
*m
, const char *name
) {
1242 if (m
->llmnr_hostname
) {
1243 r
= dns_name_equal(name
, m
->llmnr_hostname
);
1248 if (m
->mdns_hostname
) {
1249 r
= dns_name_equal(name
, m
->mdns_hostname
);
1254 if (m
->full_hostname
)
1255 return dns_name_equal(name
, m
->full_hostname
);
1260 int manager_compile_dns_servers(Manager
*m
, OrderedSet
**dns
) {
1269 r
= ordered_set_ensure_allocated(dns
, &dns_server_hash_ops
);
1273 /* First add the system-wide servers and domains */
1274 LIST_FOREACH(servers
, s
, m
->dns_servers
) {
1275 r
= ordered_set_put(*dns
, s
);
1282 /* Then, add the per-link servers */
1283 HASHMAP_FOREACH(l
, m
->links
, i
) {
1284 LIST_FOREACH(servers
, s
, l
->dns_servers
) {
1285 r
= ordered_set_put(*dns
, s
);
1293 /* If we found nothing, add the fallback servers */
1294 if (ordered_set_isempty(*dns
)) {
1295 LIST_FOREACH(servers
, s
, m
->fallback_dns_servers
) {
1296 r
= ordered_set_put(*dns
, s
);
1307 /* filter_route is a tri-state:
1309 * = 0 or false: return only domains which should be used for searching
1310 * > 0 or true: return only domains which are for routing only
1312 int manager_compile_search_domains(Manager
*m
, OrderedSet
**domains
, int filter_route
) {
1321 r
= ordered_set_ensure_allocated(domains
, &dns_name_hash_ops
);
1325 LIST_FOREACH(domains
, d
, m
->search_domains
) {
1327 if (filter_route
>= 0 &&
1328 d
->route_only
!= !!filter_route
)
1331 r
= ordered_set_put(*domains
, d
->name
);
1338 HASHMAP_FOREACH(l
, m
->links
, i
) {
1340 LIST_FOREACH(domains
, d
, l
->search_domains
) {
1342 if (filter_route
>= 0 &&
1343 d
->route_only
!= !!filter_route
)
1346 r
= ordered_set_put(*domains
, d
->name
);
1357 DnssecMode
manager_get_dnssec_mode(Manager
*m
) {
1360 if (m
->dnssec_mode
!= _DNSSEC_MODE_INVALID
)
1361 return m
->dnssec_mode
;
1366 bool manager_dnssec_supported(Manager
*m
) {
1373 if (manager_get_dnssec_mode(m
) == DNSSEC_NO
)
1376 server
= manager_get_dns_server(m
);
1377 if (server
&& !dns_server_dnssec_supported(server
))
1380 HASHMAP_FOREACH(l
, m
->links
, i
)
1381 if (!link_dnssec_supported(l
))
1387 DnsOverTlsMode
manager_get_dns_over_tls_mode(Manager
*m
) {
1390 if (m
->dns_over_tls_mode
!= _DNS_OVER_TLS_MODE_INVALID
)
1391 return m
->dns_over_tls_mode
;
1393 return DNS_OVER_TLS_NO
;
1396 void manager_dnssec_verdict(Manager
*m
, DnssecVerdict verdict
, const DnsResourceKey
*key
) {
1398 assert(verdict
>= 0);
1399 assert(verdict
< _DNSSEC_VERDICT_MAX
);
1401 if (DEBUG_LOGGING
) {
1402 char s
[DNS_RESOURCE_KEY_STRING_MAX
];
1404 log_debug("Found verdict for lookup %s: %s",
1405 dns_resource_key_to_string(key
, s
, sizeof s
),
1406 dnssec_verdict_to_string(verdict
));
1409 m
->n_dnssec_verdict
[verdict
]++;
1412 bool manager_routable(Manager
*m
, int family
) {
1418 /* Returns true if the host has at least one interface with a routable address of the specified type */
1420 HASHMAP_FOREACH(l
, m
->links
, i
)
1421 if (link_relevant(l
, family
, false))
1427 void manager_flush_caches(Manager
*m
) {
1432 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
1433 dns_cache_flush(&scope
->cache
);
1435 log_info("Flushed all caches.");
1438 void manager_reset_server_features(Manager
*m
) {
1442 dns_server_reset_features_all(m
->dns_servers
);
1443 dns_server_reset_features_all(m
->fallback_dns_servers
);
1445 HASHMAP_FOREACH(l
, m
->links
, i
)
1446 dns_server_reset_features_all(l
->dns_servers
);
1448 log_info("Resetting learnt feature levels on all servers.");
1451 void manager_cleanup_saved_user(Manager
*m
) {
1452 _cleanup_closedir_
DIR *d
= NULL
;
1458 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1459 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1460 * be restarted without losing this data. */
1462 d
= opendir("/run/systemd/resolve/netif/");
1464 if (errno
== ENOENT
)
1467 log_warning_errno(errno
, "Failed to open interface directory: %m");
1471 FOREACH_DIRENT_ALL(de
, d
, log_error_errno(errno
, "Failed to read interface directory: %m")) {
1472 _cleanup_free_
char *p
= NULL
;
1476 if (!IN_SET(de
->d_type
, DT_UNKNOWN
, DT_REG
))
1479 if (dot_or_dot_dot(de
->d_name
))
1482 r
= parse_ifindex(de
->d_name
, &ifindex
);
1483 if (r
< 0) /* Probably some temporary file from a previous run. Delete it */
1486 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
1487 if (!l
) /* link vanished */
1490 if (l
->is_managed
) /* now managed by networkd, hence the bus settings are useless */
1496 p
= strappend("/run/systemd/resolve/netif/", de
->d_name
);
1506 bool manager_next_dnssd_names(Manager
*m
) {
1514 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
) {
1515 _cleanup_free_
char * new_name
= NULL
;
1520 r
= manager_next_random_name(s
->name_template
, &new_name
);
1522 log_warning_errno(r
, "Failed to get new name for service '%s': %m", s
->name
);
1526 free_and_replace(s
->name_template
, new_name
);
1528 s
->withdrawn
= false;
1534 manager_refresh_rrs(m
);