1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2014 Tom Gundersen <teg@jklm.no>
8 #include <netinet/in.h>
10 #include <stdio_ext.h>
11 #include <sys/ioctl.h>
18 #include "alloc-util.h"
19 #include "dirent-util.h"
20 #include "dns-domain.h"
22 #include "fileio-label.h"
23 #include "hostname-util.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-dnssd.h"
33 #include "resolved-dns-stub.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
, RTM_NEWLINK
, manager_process_link
, m
);
212 r
= sd_netlink_add_match(m
->rtnl
, RTM_DELLINK
, manager_process_link
, m
);
216 r
= sd_netlink_add_match(m
->rtnl
, RTM_NEWADDR
, manager_process_address
, m
);
220 r
= sd_netlink_add_match(m
->rtnl
, RTM_DELADDR
, manager_process_address
, m
);
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
);
343 return log_error_errno(r
, "Failed to unescape host name: %m");
345 log_error("Couldn't find a single label in hostname.");
350 r
= idn2_to_unicode_8z8z(label
, &utf8
, 0);
352 return log_error("Failed to undo IDNA: %s", idn2_strerror(r
));
353 assert(utf8_is_valid(utf8
));
358 k
= dns_label_undo_idna(label
, r
, label
, sizeof label
);
360 return log_error_errno(k
, "Failed to undo IDNA: %m");
364 if (!utf8_is_valid(label
)) {
365 log_error("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 host name: %m");
377 if (is_localhost(n
)) {
378 log_debug("System hostname is 'localhost', ignoring.");
382 r
= dns_name_concat(n
, "local", mdns_hostname
);
384 return log_error_errno(r
, "Failed to determine mDNS hostname: %m");
386 *llmnr_hostname
= TAKE_PTR(n
);
387 *full_hostname
= TAKE_PTR(h
);
392 static const char *fallback_hostname(void) {
394 /* Determine the fall back hostname. For exposing this system to the outside world, we cannot have it to be
395 * "localhost" even if that's the compiled in hostname. In this case, let's revert to "linux" instead. */
397 if (is_localhost(FALLBACK_HOSTNAME
))
400 return FALLBACK_HOSTNAME
;
403 static int make_fallback_hostnames(char **full_hostname
, char **llmnr_hostname
, char **mdns_hostname
) {
404 _cleanup_free_
char *n
= NULL
, *m
= NULL
;
405 char label
[DNS_LABEL_MAX
], *h
;
409 assert(full_hostname
);
410 assert(llmnr_hostname
);
411 assert(mdns_hostname
);
413 p
= fallback_hostname();
414 r
= dns_label_unescape(&p
, label
, sizeof(label
));
416 return log_error_errno(r
, "Failed to unescape fallback host name: %m");
418 assert(r
> 0); /* The fallback hostname must have at least one label */
420 r
= dns_label_escape_new(label
, r
, &n
);
422 return log_error_errno(r
, "Failed to escape fallback hostname: %m");
424 r
= dns_name_concat(n
, "local", &m
);
426 return log_error_errno(r
, "Failed to concatenate mDNS hostname: %m");
428 h
= strdup(fallback_hostname());
432 *llmnr_hostname
= TAKE_PTR(n
);
433 *mdns_hostname
= TAKE_PTR(m
);
440 static int on_hostname_change(sd_event_source
*es
, int fd
, uint32_t revents
, void *userdata
) {
441 _cleanup_free_
char *full_hostname
= NULL
, *llmnr_hostname
= NULL
, *mdns_hostname
= NULL
;
442 Manager
*m
= userdata
;
447 r
= determine_hostname(&full_hostname
, &llmnr_hostname
, &mdns_hostname
);
449 return 0; /* ignore invalid hostnames */
451 if (streq(full_hostname
, m
->full_hostname
) &&
452 streq(llmnr_hostname
, m
->llmnr_hostname
) &&
453 streq(mdns_hostname
, m
->mdns_hostname
))
456 log_info("System hostname changed to '%s'.", full_hostname
);
458 free_and_replace(m
->full_hostname
, full_hostname
);
459 free_and_replace(m
->llmnr_hostname
, llmnr_hostname
);
460 free_and_replace(m
->mdns_hostname
, mdns_hostname
);
462 manager_refresh_rrs(m
);
467 static int manager_watch_hostname(Manager
*m
) {
472 m
->hostname_fd
= open("/proc/sys/kernel/hostname",
473 O_RDONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
474 if (m
->hostname_fd
< 0) {
475 log_warning_errno(errno
, "Failed to watch hostname: %m");
479 r
= sd_event_add_io(m
->event
, &m
->hostname_event_source
, m
->hostname_fd
, 0, on_hostname_change
, m
);
482 /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
483 m
->hostname_fd
= safe_close(m
->hostname_fd
);
485 return log_error_errno(r
, "Failed to add hostname event source: %m");
488 (void) sd_event_source_set_description(m
->hostname_event_source
, "hostname");
490 r
= determine_hostname(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
492 log_info("Defaulting to hostname '%s'.", fallback_hostname());
494 r
= make_fallback_hostnames(&m
->full_hostname
, &m
->llmnr_hostname
, &m
->mdns_hostname
);
498 log_info("Using system hostname '%s'.", m
->full_hostname
);
503 static int manager_sigusr1(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
504 _cleanup_free_
char *buffer
= NULL
;
505 _cleanup_fclose_
FILE *f
= NULL
;
506 Manager
*m
= userdata
;
517 f
= open_memstream(&buffer
, &size
);
521 (void) __fsetlocking(f
, FSETLOCKING_BYCALLER
);
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
;
570 m
= new0(Manager
, 1);
574 m
->llmnr_ipv4_udp_fd
= m
->llmnr_ipv6_udp_fd
= -1;
575 m
->llmnr_ipv4_tcp_fd
= m
->llmnr_ipv6_tcp_fd
= -1;
576 m
->mdns_ipv4_fd
= m
->mdns_ipv6_fd
= -1;
577 m
->dns_stub_udp_fd
= m
->dns_stub_tcp_fd
= -1;
580 m
->llmnr_support
= RESOLVE_SUPPORT_YES
;
581 m
->mdns_support
= RESOLVE_SUPPORT_YES
;
582 m
->dnssec_mode
= DEFAULT_DNSSEC_MODE
;
583 m
->private_dns_mode
= DEFAULT_PRIVATE_DNS_MODE
;
584 m
->enable_cache
= true;
585 m
->dns_stub_listener_mode
= DNS_STUB_LISTENER_UDP
;
586 m
->read_resolv_conf
= true;
587 m
->need_builtin_fallbacks
= true;
588 m
->etc_hosts_last
= m
->etc_hosts_mtime
= USEC_INFINITY
;
590 r
= dns_trust_anchor_load(&m
->trust_anchor
);
594 r
= manager_parse_config_file(m
);
596 log_warning_errno(r
, "Failed to parse configuration file: %m");
598 r
= sd_event_default(&m
->event
);
602 sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
603 sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
605 sd_event_set_watchdog(m
->event
, true);
607 r
= manager_watch_hostname(m
);
613 log_warning_errno(r
, "Failed to load DNS-SD configuration files: %m");
615 r
= dns_scope_new(m
, &m
->unicast_scope
, NULL
, DNS_PROTOCOL_DNS
, AF_UNSPEC
);
619 r
= manager_network_monitor_listen(m
);
623 r
= manager_rtnl_listen(m
);
627 r
= manager_connect_bus(m
);
631 (void) sd_event_add_signal(m
->event
, &m
->sigusr1_event_source
, SIGUSR1
, manager_sigusr1
, m
);
632 (void) sd_event_add_signal(m
->event
, &m
->sigusr2_event_source
, SIGUSR2
, manager_sigusr2
, m
);
633 (void) sd_event_add_signal(m
->event
, &m
->sigrtmin1_event_source
, SIGRTMIN
+1, manager_sigrtmin1
, m
);
635 manager_cleanup_saved_user(m
);
642 int manager_start(Manager
*m
) {
647 r
= manager_dns_stub_start(m
);
654 Manager
*manager_free(Manager
*m
) {
661 dns_server_unlink_all(m
->dns_servers
);
662 dns_server_unlink_all(m
->fallback_dns_servers
);
663 dns_search_domain_unlink_all(m
->search_domains
);
665 while ((l
= hashmap_first(m
->links
)))
668 while (m
->dns_queries
)
669 dns_query_free(m
->dns_queries
);
671 dns_scope_free(m
->unicast_scope
);
673 /* At this point only orphaned streams should remain. All others should have been freed already by their
675 while (m
->dns_streams
)
676 dns_stream_unref(m
->dns_streams
);
678 hashmap_free(m
->links
);
679 hashmap_free(m
->dns_transactions
);
681 sd_event_source_unref(m
->network_event_source
);
682 sd_network_monitor_unref(m
->network_monitor
);
684 sd_netlink_unref(m
->rtnl
);
685 sd_event_source_unref(m
->rtnl_event_source
);
687 manager_llmnr_stop(m
);
688 manager_mdns_stop(m
);
689 manager_dns_stub_stop(m
);
691 sd_bus_slot_unref(m
->prepare_for_sleep_slot
);
692 sd_bus_unref(m
->bus
);
694 sd_event_source_unref(m
->sigusr1_event_source
);
695 sd_event_source_unref(m
->sigusr2_event_source
);
696 sd_event_source_unref(m
->sigrtmin1_event_source
);
698 sd_event_unref(m
->event
);
700 dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
701 dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
702 dns_resource_key_unref(m
->mdns_host_ipv4_key
);
703 dns_resource_key_unref(m
->mdns_host_ipv6_key
);
705 sd_event_source_unref(m
->hostname_event_source
);
706 safe_close(m
->hostname_fd
);
708 free(m
->full_hostname
);
709 free(m
->llmnr_hostname
);
710 free(m
->mdns_hostname
);
712 while ((s
= hashmap_first(m
->dnssd_services
)))
713 dnssd_service_free(s
);
714 hashmap_free(m
->dnssd_services
);
716 dns_trust_anchor_flush(&m
->trust_anchor
);
717 manager_etc_hosts_flush(m
);
722 int manager_recv(Manager
*m
, int fd
, DnsProtocol protocol
, DnsPacket
**ret
) {
723 _cleanup_(dns_packet_unrefp
) DnsPacket
*p
= NULL
;
725 struct cmsghdr header
; /* For alignment */
726 uint8_t buffer
[CMSG_SPACE(MAXSIZE(struct in_pktinfo
, struct in6_pktinfo
))
727 + CMSG_SPACE(int) /* ttl/hoplimit */
728 + EXTRA_CMSG_SPACE
/* kernel appears to require extra buffer space */];
730 union sockaddr_union sa
;
731 struct msghdr mh
= {};
732 struct cmsghdr
*cmsg
;
741 ms
= next_datagram_size_fd(fd
);
745 r
= dns_packet_new(&p
, protocol
, ms
, DNS_PACKET_SIZE_MAX
);
749 iov
.iov_base
= DNS_PACKET_DATA(p
);
750 iov
.iov_len
= p
->allocated
;
752 mh
.msg_name
= &sa
.sa
;
753 mh
.msg_namelen
= sizeof(sa
);
756 mh
.msg_control
= &control
;
757 mh
.msg_controllen
= sizeof(control
);
759 l
= recvmsg(fd
, &mh
, 0);
763 if (IN_SET(errno
, EAGAIN
, EINTR
))
769 assert(!(mh
.msg_flags
& MSG_CTRUNC
));
770 assert(!(mh
.msg_flags
& MSG_TRUNC
));
772 p
->size
= (size_t) l
;
774 p
->family
= sa
.sa
.sa_family
;
775 p
->ipproto
= IPPROTO_UDP
;
776 if (p
->family
== AF_INET
) {
777 p
->sender
.in
= sa
.in
.sin_addr
;
778 p
->sender_port
= be16toh(sa
.in
.sin_port
);
779 } else if (p
->family
== AF_INET6
) {
780 p
->sender
.in6
= sa
.in6
.sin6_addr
;
781 p
->sender_port
= be16toh(sa
.in6
.sin6_port
);
782 p
->ifindex
= sa
.in6
.sin6_scope_id
;
784 return -EAFNOSUPPORT
;
786 CMSG_FOREACH(cmsg
, &mh
) {
788 if (cmsg
->cmsg_level
== IPPROTO_IPV6
) {
789 assert(p
->family
== AF_INET6
);
791 switch (cmsg
->cmsg_type
) {
794 struct in6_pktinfo
*i
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
797 p
->ifindex
= i
->ipi6_ifindex
;
799 p
->destination
.in6
= i
->ipi6_addr
;
804 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
808 } else if (cmsg
->cmsg_level
== IPPROTO_IP
) {
809 assert(p
->family
== AF_INET
);
811 switch (cmsg
->cmsg_type
) {
814 struct in_pktinfo
*i
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
817 p
->ifindex
= i
->ipi_ifindex
;
819 p
->destination
.in
= i
->ipi_addr
;
824 p
->ttl
= *(int *) CMSG_DATA(cmsg
);
830 /* The Linux kernel sets the interface index to the loopback
831 * device if the packet came from the local host since it
832 * avoids the routing table in such a case. Let's unset the
833 * interface index in such a case. */
834 if (p
->ifindex
== LOOPBACK_IFINDEX
)
837 if (protocol
!= DNS_PROTOCOL_DNS
) {
838 /* If we don't know the interface index still, we look for the
839 * first local interface with a matching address. Yuck! */
841 p
->ifindex
= manager_find_ifindex(m
, p
->family
, &p
->destination
);
849 static int sendmsg_loop(int fd
, struct msghdr
*mh
, int flags
) {
856 if (sendmsg(fd
, mh
, flags
) >= 0)
865 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
873 static int write_loop(int fd
, void *message
, size_t length
) {
880 if (write(fd
, message
, length
) >= 0)
889 r
= fd_wait_for_event(fd
, POLLOUT
, SEND_TIMEOUT_USEC
);
897 int manager_write(Manager
*m
, int fd
, DnsPacket
*p
) {
900 log_debug("Sending %s packet with id %" PRIu16
".", DNS_PACKET_QR(p
) ? "response" : "query", DNS_PACKET_ID(p
));
902 r
= write_loop(fd
, DNS_PACKET_DATA(p
), p
->size
);
909 static int manager_ipv4_send(
913 const struct in_addr
*destination
,
915 const struct in_addr
*source
,
917 union sockaddr_union sa
= {
918 .in
.sin_family
= AF_INET
,
921 struct cmsghdr header
; /* For alignment */
922 uint8_t buffer
[CMSG_SPACE(sizeof(struct in_pktinfo
))];
924 struct msghdr mh
= {};
933 iov
.iov_base
= DNS_PACKET_DATA(p
);
934 iov
.iov_len
= p
->size
;
936 sa
.in
.sin_addr
= *destination
;
937 sa
.in
.sin_port
= htobe16(port
),
941 mh
.msg_name
= &sa
.sa
;
942 mh
.msg_namelen
= sizeof(sa
.in
);
945 struct cmsghdr
*cmsg
;
946 struct in_pktinfo
*pi
;
950 mh
.msg_control
= &control
;
951 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
));
953 cmsg
= CMSG_FIRSTHDR(&mh
);
954 cmsg
->cmsg_len
= mh
.msg_controllen
;
955 cmsg
->cmsg_level
= IPPROTO_IP
;
956 cmsg
->cmsg_type
= IP_PKTINFO
;
958 pi
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
959 pi
->ipi_ifindex
= ifindex
;
962 pi
->ipi_spec_dst
= *source
;
965 return sendmsg_loop(fd
, &mh
, 0);
968 static int manager_ipv6_send(
972 const struct in6_addr
*destination
,
974 const struct in6_addr
*source
,
977 union sockaddr_union sa
= {
978 .in6
.sin6_family
= AF_INET6
,
981 struct cmsghdr header
; /* For alignment */
982 uint8_t buffer
[CMSG_SPACE(sizeof(struct in6_pktinfo
))];
984 struct msghdr mh
= {};
993 iov
.iov_base
= DNS_PACKET_DATA(p
);
994 iov
.iov_len
= p
->size
;
996 sa
.in6
.sin6_addr
= *destination
;
997 sa
.in6
.sin6_port
= htobe16(port
),
998 sa
.in6
.sin6_scope_id
= ifindex
;
1002 mh
.msg_name
= &sa
.sa
;
1003 mh
.msg_namelen
= sizeof(sa
.in6
);
1006 struct cmsghdr
*cmsg
;
1007 struct in6_pktinfo
*pi
;
1011 mh
.msg_control
= &control
;
1012 mh
.msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
));
1014 cmsg
= CMSG_FIRSTHDR(&mh
);
1015 cmsg
->cmsg_len
= mh
.msg_controllen
;
1016 cmsg
->cmsg_level
= IPPROTO_IPV6
;
1017 cmsg
->cmsg_type
= IPV6_PKTINFO
;
1019 pi
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
1020 pi
->ipi6_ifindex
= ifindex
;
1023 pi
->ipi6_addr
= *source
;
1026 return sendmsg_loop(fd
, &mh
, 0);
1034 const union in_addr_union
*destination
,
1036 const union in_addr_union
*source
,
1041 assert(destination
);
1045 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
));
1047 if (family
== AF_INET
)
1048 return manager_ipv4_send(m
, fd
, ifindex
, &destination
->in
, port
, &source
->in
, p
);
1049 if (family
== AF_INET6
)
1050 return manager_ipv6_send(m
, fd
, ifindex
, &destination
->in6
, port
, &source
->in6
, p
);
1052 return -EAFNOSUPPORT
;
1055 uint32_t manager_find_mtu(Manager
*m
) {
1060 /* If we don't know on which link a DNS packet would be
1061 * delivered, let's find the largest MTU that works on all
1062 * interfaces we know of */
1064 HASHMAP_FOREACH(l
, m
->links
, i
) {
1068 if (mtu
<= 0 || l
->mtu
< mtu
)
1075 int manager_find_ifindex(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1080 a
= manager_find_link_address(m
, family
, in_addr
);
1082 return a
->link
->ifindex
;
1087 void manager_refresh_rrs(Manager
*m
) {
1094 m
->llmnr_host_ipv4_key
= dns_resource_key_unref(m
->llmnr_host_ipv4_key
);
1095 m
->llmnr_host_ipv6_key
= dns_resource_key_unref(m
->llmnr_host_ipv6_key
);
1096 m
->mdns_host_ipv4_key
= dns_resource_key_unref(m
->mdns_host_ipv4_key
);
1097 m
->mdns_host_ipv6_key
= dns_resource_key_unref(m
->mdns_host_ipv6_key
);
1099 if (m
->mdns_support
== RESOLVE_SUPPORT_YES
)
1100 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
)
1101 if (dnssd_update_rrs(s
) < 0)
1102 log_warning("Failed to refresh DNS-SD service '%s'", s
->name
);
1104 HASHMAP_FOREACH(l
, m
->links
, i
) {
1105 link_add_rrs(l
, true);
1106 link_add_rrs(l
, false);
1110 static int manager_next_random_name(const char *old
, char **ret_new
) {
1119 if (!strchr(DIGITS
, p
[-1]))
1125 if (*p
== 0 || safe_atou64(p
, &u
) < 0 || u
<= 0)
1128 /* Add a random number to the old value. This way we can avoid
1129 * that two hosts pick the same hostname, win on IPv4 and lose
1130 * on IPv6 (or vice versa), and pick the same hostname
1131 * replacement hostname, ad infinitum. We still want the
1132 * numbers to go up monotonically, hence we just add a random
1135 random_bytes(&a
, sizeof(a
));
1138 if (asprintf(&n
, "%.*s%" PRIu64
, (int) (p
- old
), old
, u
) < 0)
1146 int manager_next_hostname(Manager
*m
) {
1147 _cleanup_free_
char *h
= NULL
, *k
= NULL
;
1152 r
= manager_next_random_name(m
->llmnr_hostname
, &h
);
1156 r
= dns_name_concat(h
, "local", &k
);
1160 log_info("Hostname conflict, changing published hostname from '%s' to '%s'.", m
->llmnr_hostname
, h
);
1162 free_and_replace(m
->llmnr_hostname
, h
);
1163 free_and_replace(m
->mdns_hostname
, k
);
1165 manager_refresh_rrs(m
);
1170 LinkAddress
* manager_find_link_address(Manager
*m
, int family
, const union in_addr_union
*in_addr
) {
1176 HASHMAP_FOREACH(l
, m
->links
, i
) {
1179 a
= link_find_address(l
, family
, in_addr
);
1187 bool manager_our_packet(Manager
*m
, DnsPacket
*p
) {
1191 return !!manager_find_link_address(m
, p
->family
, &p
->sender
);
1194 DnsScope
* manager_find_scope(Manager
*m
, DnsPacket
*p
) {
1200 l
= hashmap_get(m
->links
, INT_TO_PTR(p
->ifindex
));
1204 switch (p
->protocol
) {
1205 case DNS_PROTOCOL_LLMNR
:
1206 if (p
->family
== AF_INET
)
1207 return l
->llmnr_ipv4_scope
;
1208 else if (p
->family
== AF_INET6
)
1209 return l
->llmnr_ipv6_scope
;
1213 case DNS_PROTOCOL_MDNS
:
1214 if (p
->family
== AF_INET
)
1215 return l
->mdns_ipv4_scope
;
1216 else if (p
->family
== AF_INET6
)
1217 return l
->mdns_ipv6_scope
;
1228 void manager_verify_all(Manager
*m
) {
1233 LIST_FOREACH(scopes
, s
, m
->dns_scopes
)
1234 dns_zone_verify_all(&s
->zone
);
1237 int manager_is_own_hostname(Manager
*m
, const char *name
) {
1243 if (m
->llmnr_hostname
) {
1244 r
= dns_name_equal(name
, m
->llmnr_hostname
);
1249 if (m
->mdns_hostname
) {
1250 r
= dns_name_equal(name
, m
->mdns_hostname
);
1255 if (m
->full_hostname
)
1256 return dns_name_equal(name
, m
->full_hostname
);
1261 int manager_compile_dns_servers(Manager
*m
, OrderedSet
**dns
) {
1270 r
= ordered_set_ensure_allocated(dns
, &dns_server_hash_ops
);
1274 /* First add the system-wide servers and domains */
1275 LIST_FOREACH(servers
, s
, m
->dns_servers
) {
1276 r
= ordered_set_put(*dns
, s
);
1283 /* Then, add the per-link servers */
1284 HASHMAP_FOREACH(l
, m
->links
, i
) {
1285 LIST_FOREACH(servers
, s
, l
->dns_servers
) {
1286 r
= ordered_set_put(*dns
, s
);
1294 /* If we found nothing, add the fallback servers */
1295 if (ordered_set_isempty(*dns
)) {
1296 LIST_FOREACH(servers
, s
, m
->fallback_dns_servers
) {
1297 r
= ordered_set_put(*dns
, s
);
1308 /* filter_route is a tri-state:
1310 * = 0 or false: return only domains which should be used for searching
1311 * > 0 or true: return only domains which are for routing only
1313 int manager_compile_search_domains(Manager
*m
, OrderedSet
**domains
, int filter_route
) {
1322 r
= ordered_set_ensure_allocated(domains
, &dns_name_hash_ops
);
1326 LIST_FOREACH(domains
, d
, m
->search_domains
) {
1328 if (filter_route
>= 0 &&
1329 d
->route_only
!= !!filter_route
)
1332 r
= ordered_set_put(*domains
, d
->name
);
1339 HASHMAP_FOREACH(l
, m
->links
, i
) {
1341 LIST_FOREACH(domains
, d
, l
->search_domains
) {
1343 if (filter_route
>= 0 &&
1344 d
->route_only
!= !!filter_route
)
1347 r
= ordered_set_put(*domains
, d
->name
);
1358 DnssecMode
manager_get_dnssec_mode(Manager
*m
) {
1361 if (m
->dnssec_mode
!= _DNSSEC_MODE_INVALID
)
1362 return m
->dnssec_mode
;
1367 bool manager_dnssec_supported(Manager
*m
) {
1374 if (manager_get_dnssec_mode(m
) == DNSSEC_NO
)
1377 server
= manager_get_dns_server(m
);
1378 if (server
&& !dns_server_dnssec_supported(server
))
1381 HASHMAP_FOREACH(l
, m
->links
, i
)
1382 if (!link_dnssec_supported(l
))
1388 PrivateDnsMode
manager_get_private_dns_mode(Manager
*m
) {
1391 if (m
->private_dns_mode
!= _PRIVATE_DNS_MODE_INVALID
)
1392 return m
->private_dns_mode
;
1394 return PRIVATE_DNS_NO
;
1397 void manager_dnssec_verdict(Manager
*m
, DnssecVerdict verdict
, const DnsResourceKey
*key
) {
1399 assert(verdict
>= 0);
1400 assert(verdict
< _DNSSEC_VERDICT_MAX
);
1402 if (DEBUG_LOGGING
) {
1403 char s
[DNS_RESOURCE_KEY_STRING_MAX
];
1405 log_debug("Found verdict for lookup %s: %s",
1406 dns_resource_key_to_string(key
, s
, sizeof s
),
1407 dnssec_verdict_to_string(verdict
));
1410 m
->n_dnssec_verdict
[verdict
]++;
1413 bool manager_routable(Manager
*m
, int family
) {
1419 /* Returns true if the host has at least one interface with a routable address of the specified type */
1421 HASHMAP_FOREACH(l
, m
->links
, i
)
1422 if (link_relevant(l
, family
, false))
1428 void manager_flush_caches(Manager
*m
) {
1433 LIST_FOREACH(scopes
, scope
, m
->dns_scopes
)
1434 dns_cache_flush(&scope
->cache
);
1436 log_info("Flushed all caches.");
1439 void manager_reset_server_features(Manager
*m
) {
1443 dns_server_reset_features_all(m
->dns_servers
);
1444 dns_server_reset_features_all(m
->fallback_dns_servers
);
1446 HASHMAP_FOREACH(l
, m
->links
, i
)
1447 dns_server_reset_features_all(l
->dns_servers
);
1449 log_info("Resetting learnt feature levels on all servers.");
1452 void manager_cleanup_saved_user(Manager
*m
) {
1453 _cleanup_closedir_
DIR *d
= NULL
;
1459 /* Clean up all saved per-link files in /run/systemd/resolve/netif/ that don't have a matching interface
1460 * anymore. These files are created to persist settings pushed in by the user via the bus, so that resolved can
1461 * be restarted without losing this data. */
1463 d
= opendir("/run/systemd/resolve/netif/");
1465 if (errno
== ENOENT
)
1468 log_warning_errno(errno
, "Failed to open interface directory: %m");
1472 FOREACH_DIRENT_ALL(de
, d
, log_error_errno(errno
, "Failed to read interface directory: %m")) {
1473 _cleanup_free_
char *p
= NULL
;
1477 if (!IN_SET(de
->d_type
, DT_UNKNOWN
, DT_REG
))
1480 if (dot_or_dot_dot(de
->d_name
))
1483 r
= parse_ifindex(de
->d_name
, &ifindex
);
1484 if (r
< 0) /* Probably some temporary file from a previous run. Delete it */
1487 l
= hashmap_get(m
->links
, INT_TO_PTR(ifindex
));
1488 if (!l
) /* link vanished */
1491 if (l
->is_managed
) /* now managed by networkd, hence the bus settings are useless */
1497 p
= strappend("/run/systemd/resolve/netif/", de
->d_name
);
1507 bool manager_next_dnssd_names(Manager
*m
) {
1515 HASHMAP_FOREACH(s
, m
->dnssd_services
, i
) {
1516 _cleanup_free_
char * new_name
= NULL
;
1521 r
= manager_next_random_name(s
->name_template
, &new_name
);
1523 log_warning_errno(r
, "Failed to get new name for service '%s': %m", s
->name
);
1527 free_and_replace(s
->name_template
, new_name
);
1529 s
->withdrawn
= false;
1535 manager_refresh_rrs(m
);