1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 #include <netinet/in.h>
6 #include <netinet/ip.h>
9 #include <sys/socket.h>
10 #include <sys/timerfd.h>
11 #include <sys/timex.h>
12 #include <sys/types.h>
15 #include "sd-daemon.h"
17 #include "alloc-util.h"
18 #include "dns-domain.h"
24 #include "network-util.h"
25 #include "ratelimit.h"
26 #include "socket-util.h"
27 #include "string-util.h"
29 #include "time-util.h"
30 #include "timesyncd-conf.h"
31 #include "timesyncd-manager.h"
35 #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */
38 /* expected accuracy of time synchronization; used to adjust the poll interval */
39 #define NTP_ACCURACY_SEC 0.2
42 * Maximum delta in seconds which the system clock is gradually adjusted
43 * (slewed) to approach the network time. Deltas larger that this are set by
44 * letting the system time jump. The kernel's limit for adjtime is 0.5s.
46 #define NTP_MAX_ADJUST 0.4
48 /* Default of maximum acceptable root distance in microseconds. */
49 #define NTP_MAX_ROOT_DISTANCE (5 * USEC_PER_SEC)
51 /* Maximum number of missed replies before selecting another source. */
52 #define NTP_MAX_MISSED_REPLIES 2
54 #define RETRY_USEC (30*USEC_PER_SEC)
55 #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC)
56 #define RATELIMIT_BURST 10
58 #define TIMEOUT_USEC (10*USEC_PER_SEC)
60 static int manager_arm_timer(Manager
*m
, usec_t next
);
61 static int manager_clock_watch_setup(Manager
*m
);
62 static int manager_listen_setup(Manager
*m
);
63 static void manager_listen_stop(Manager
*m
);
65 static double ntp_ts_short_to_d(const struct ntp_ts_short
*ts
) {
66 return be16toh(ts
->sec
) + (be16toh(ts
->frac
) / 65536.0);
69 static double ntp_ts_to_d(const struct ntp_ts
*ts
) {
70 return be32toh(ts
->sec
) + ((double)be32toh(ts
->frac
) / UINT_MAX
);
73 static double ts_to_d(const struct timespec
*ts
) {
74 return ts
->tv_sec
+ (1.0e-9 * ts
->tv_nsec
);
77 static int manager_timeout(sd_event_source
*source
, usec_t usec
, void *userdata
) {
78 _cleanup_free_
char *pretty
= NULL
;
79 Manager
*m
= userdata
;
82 assert(m
->current_server_name
);
83 assert(m
->current_server_address
);
85 server_address_pretty(m
->current_server_address
, &pretty
);
86 log_info("Timed out waiting for reply from %s (%s).", strna(pretty
), m
->current_server_name
->string
);
88 return manager_connect(m
);
91 static int manager_send_request(Manager
*m
) {
92 _cleanup_free_
char *pretty
= NULL
;
93 struct ntp_msg ntpmsg
= {
95 * "The client initializes the NTP message header, sends the request
96 * to the server, and strips the time of day from the Transmit
97 * Timestamp field of the reply. For this purpose, all the NTP
98 * header fields are set to 0, except the Mode, VN, and optional
99 * Transmit Timestamp fields."
101 .field
= NTP_FIELD(0, 4, NTP_MODE_CLIENT
),
107 assert(m
->current_server_name
);
108 assert(m
->current_server_address
);
110 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
112 r
= manager_listen_setup(m
);
114 return log_warning_errno(r
, "Failed to setup connection socket: %m");
117 * Set transmit timestamp, remember it; the server will send that back
118 * as the origin timestamp and we have an indication that this is the
119 * matching answer to our request.
121 * The actual value does not matter, We do not care about the correct
122 * NTP UINT_MAX fraction; we just pass the plain nanosecond value.
124 assert_se(clock_gettime(clock_boottime_or_monotonic(), &m
->trans_time_mon
) >= 0);
125 assert_se(clock_gettime(CLOCK_REALTIME
, &m
->trans_time
) >= 0);
126 ntpmsg
.trans_time
.sec
= htobe32(m
->trans_time
.tv_sec
+ OFFSET_1900_1970
);
127 ntpmsg
.trans_time
.frac
= htobe32(m
->trans_time
.tv_nsec
);
129 server_address_pretty(m
->current_server_address
, &pretty
);
131 len
= sendto(m
->server_socket
, &ntpmsg
, sizeof(ntpmsg
), MSG_DONTWAIT
, &m
->current_server_address
->sockaddr
.sa
, m
->current_server_address
->socklen
);
132 if (len
== sizeof(ntpmsg
)) {
134 log_debug("Sent NTP request to %s (%s).", strna(pretty
), m
->current_server_name
->string
);
136 log_debug_errno(errno
, "Sending NTP request to %s (%s) failed: %m", strna(pretty
), m
->current_server_name
->string
);
137 return manager_connect(m
);
140 /* re-arm timer with increasing timeout, in case the packets never arrive back */
141 if (m
->retry_interval
> 0) {
142 if (m
->retry_interval
< m
->poll_interval_max_usec
)
143 m
->retry_interval
*= 2;
145 m
->retry_interval
= m
->poll_interval_min_usec
;
147 r
= manager_arm_timer(m
, m
->retry_interval
);
149 return log_error_errno(r
, "Failed to rearm timer: %m");
152 if (m
->missed_replies
> NTP_MAX_MISSED_REPLIES
) {
153 r
= sd_event_add_time(
156 clock_boottime_or_monotonic(),
157 now(clock_boottime_or_monotonic()) + TIMEOUT_USEC
, 0,
160 return log_error_errno(r
, "Failed to arm timeout timer: %m");
166 static int manager_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
167 Manager
*m
= userdata
;
171 return manager_send_request(m
);
174 static int manager_arm_timer(Manager
*m
, usec_t next
) {
180 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
184 if (m
->event_timer
) {
185 r
= sd_event_source_set_time(m
->event_timer
, now(clock_boottime_or_monotonic()) + next
);
189 return sd_event_source_set_enabled(m
->event_timer
, SD_EVENT_ONESHOT
);
192 return sd_event_add_time(
195 clock_boottime_or_monotonic(),
196 now(clock_boottime_or_monotonic()) + next
, 0,
200 static int manager_clock_watch(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
201 Manager
*m
= userdata
;
206 manager_clock_watch_setup(m
);
208 /* skip our own jumps */
215 log_debug("System time changed. Resyncing.");
216 m
->poll_resync
= true;
218 return manager_send_request(m
);
221 /* wake up when the system time changes underneath us */
222 static int manager_clock_watch_setup(Manager
*m
) {
227 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
228 safe_close(m
->clock_watch_fd
);
230 m
->clock_watch_fd
= time_change_fd();
231 if (m
->clock_watch_fd
< 0)
232 return log_error_errno(m
->clock_watch_fd
, "Failed to create timerfd: %m");
234 r
= sd_event_add_io(m
->event
, &m
->event_clock_watch
, m
->clock_watch_fd
, EPOLLIN
, manager_clock_watch
, m
);
236 return log_error_errno(r
, "Failed to create clock watch event source: %m");
241 static int manager_adjust_clock(Manager
*m
, double offset
, int leap_sec
) {
242 struct timex tmx
= {};
248 * For small deltas, tell the kernel to gradually adjust the system
249 * clock to the NTP time, larger deltas are just directly set.
251 if (fabs(offset
) < NTP_MAX_ADJUST
) {
252 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_OFFSET
| ADJ_TIMECONST
| ADJ_MAXERROR
| ADJ_ESTERROR
;
253 tmx
.status
= STA_PLL
;
254 tmx
.offset
= offset
* NSEC_PER_SEC
;
255 tmx
.constant
= log2i(m
->poll_interval_usec
/ USEC_PER_SEC
) - 4;
258 log_debug(" adjust (slew): %+.3f sec", offset
);
260 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_SETOFFSET
| ADJ_MAXERROR
| ADJ_ESTERROR
;
262 /* ADJ_NANO uses nanoseconds in the microseconds field */
263 tmx
.time
.tv_sec
= (long)offset
;
264 tmx
.time
.tv_usec
= (offset
- tmx
.time
.tv_sec
) * NSEC_PER_SEC
;
268 /* the kernel expects -0.3s as {-1, 7000.000.000} */
269 if (tmx
.time
.tv_usec
< 0) {
270 tmx
.time
.tv_sec
-= 1;
271 tmx
.time
.tv_usec
+= NSEC_PER_SEC
;
275 log_debug(" adjust (jump): %+.3f sec", offset
);
279 * An unset STA_UNSYNC will enable the kernel's 11-minute mode,
280 * which syncs the system time periodically to the RTC.
282 * In case the RTC runs in local time, never touch the RTC,
283 * we have no way to properly handle daylight saving changes and
284 * mobile devices moving between time zones.
286 if (m
->rtc_local_time
)
287 tmx
.status
|= STA_UNSYNC
;
291 tmx
.status
|= STA_INS
;
294 tmx
.status
|= STA_DEL
;
298 r
= clock_adjtime(CLOCK_REALTIME
, &tmx
);
302 /* If touch fails, there isn't much we can do. Maybe it'll work next time. */
303 (void) touch("/var/lib/systemd/timesync/clock");
304 (void) touch("/run/systemd/timesync/synchronized");
306 m
->drift_freq
= tmx
.freq
;
308 log_debug(" status : %04i %s\n"
309 " time now : %"PRI_TIME
".%03"PRI_USEC
"\n"
310 " constant : %"PRI_TIMEX
"\n"
311 " offset : %+.3f sec\n"
312 " freq offset : %+"PRI_TIMEX
" (%+"PRI_TIMEX
" ppm)\n",
313 tmx
.status
, tmx
.status
& STA_UNSYNC
? "unsync" : "sync",
314 tmx
.time
.tv_sec
, tmx
.time
.tv_usec
/ NSEC_PER_MSEC
,
316 (double)tmx
.offset
/ NSEC_PER_SEC
,
317 tmx
.freq
, tmx
.freq
/ 65536);
322 static bool manager_sample_spike_detection(Manager
*m
, double offset
, double delay
) {
323 unsigned int i
, idx_cur
, idx_new
, idx_min
;
331 /* ignore initial sample */
332 if (m
->packet_count
== 1)
335 /* store the current data in our samples array */
336 idx_cur
= m
->samples_idx
;
337 idx_new
= (idx_cur
+ 1) % ELEMENTSOF(m
->samples
);
338 m
->samples_idx
= idx_new
;
339 m
->samples
[idx_new
].offset
= offset
;
340 m
->samples
[idx_new
].delay
= delay
;
342 /* calculate new jitter value from the RMS differences relative to the lowest delay sample */
343 jitter
= m
->samples_jitter
;
344 for (idx_min
= idx_cur
, i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
345 if (m
->samples
[i
].delay
> 0 && m
->samples
[i
].delay
< m
->samples
[idx_min
].delay
)
349 for (i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
350 j
+= pow(m
->samples
[i
].offset
- m
->samples
[idx_min
].offset
, 2);
351 m
->samples_jitter
= sqrt(j
/ (ELEMENTSOF(m
->samples
) - 1));
353 /* ignore samples when resyncing */
357 /* always accept offset if we are farther off than the round-trip delay */
358 if (fabs(offset
) > delay
)
361 /* we need a few samples before looking at them */
362 if (m
->packet_count
< 4)
365 /* do not accept anything worse than the maximum possible error of the best sample */
366 if (fabs(offset
) > m
->samples
[idx_min
].delay
)
369 /* compare the difference between the current offset to the previous offset and jitter */
370 return fabs(offset
- m
->samples
[idx_cur
].offset
) > 3 * jitter
;
373 static void manager_adjust_poll(Manager
*m
, double offset
, bool spike
) {
376 if (m
->poll_resync
) {
377 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
378 m
->poll_resync
= false;
382 /* set to minimal poll interval */
383 if (!spike
&& fabs(offset
) > NTP_ACCURACY_SEC
) {
384 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
388 /* increase polling interval */
389 if (fabs(offset
) < NTP_ACCURACY_SEC
* 0.25) {
390 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
391 m
->poll_interval_usec
*= 2;
395 /* decrease polling interval */
396 if (spike
|| fabs(offset
) > NTP_ACCURACY_SEC
* 0.75) {
397 if (m
->poll_interval_usec
> m
->poll_interval_min_usec
)
398 m
->poll_interval_usec
/= 2;
403 static int manager_receive_response(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
404 Manager
*m
= userdata
;
405 struct ntp_msg ntpmsg
;
409 .iov_len
= sizeof(ntpmsg
),
412 struct cmsghdr cmsghdr
;
413 uint8_t buf
[CMSG_SPACE(sizeof(struct timeval
))];
415 union sockaddr_union server_addr
;
416 struct msghdr msghdr
= {
419 .msg_control
= &control
,
420 .msg_controllen
= sizeof(control
),
421 .msg_name
= &server_addr
,
422 .msg_namelen
= sizeof(server_addr
),
424 struct cmsghdr
*cmsg
;
425 struct timespec
*recv_time
= NULL
;
427 double origin
, receive
, trans
, dest
;
428 double delay
, offset
;
429 double root_distance
;
437 if (revents
& (EPOLLHUP
|EPOLLERR
)) {
438 log_warning("Server connection returned error.");
439 return manager_connect(m
);
442 len
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
);
447 log_warning("Error receiving message. Disconnecting.");
448 return manager_connect(m
);
451 /* Too short or too long packet? */
452 if (iov
.iov_len
< sizeof(struct ntp_msg
) || (msghdr
.msg_flags
& MSG_TRUNC
)) {
453 log_warning("Invalid response from server. Disconnecting.");
454 return manager_connect(m
);
457 if (!m
->current_server_name
||
458 !m
->current_server_address
||
459 !sockaddr_equal(&server_addr
, &m
->current_server_address
->sockaddr
)) {
460 log_debug("Response from unknown server.");
464 CMSG_FOREACH(cmsg
, &msghdr
) {
465 if (cmsg
->cmsg_level
!= SOL_SOCKET
)
468 switch (cmsg
->cmsg_type
) {
469 case SCM_TIMESTAMPNS
:
470 recv_time
= (struct timespec
*) CMSG_DATA(cmsg
);
475 log_error("Invalid packet timestamp.");
480 log_debug("Unexpected reply. Ignoring.");
484 m
->missed_replies
= 0;
486 /* check our "time cookie" (we just stored nanoseconds in the fraction field) */
487 if (be32toh(ntpmsg
.origin_time
.sec
) != m
->trans_time
.tv_sec
+ OFFSET_1900_1970
||
488 be32toh(ntpmsg
.origin_time
.frac
) != (unsigned long) m
->trans_time
.tv_nsec
) {
489 log_debug("Invalid reply; not our transmit time. Ignoring.");
493 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
495 if (be32toh(ntpmsg
.recv_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
||
496 be32toh(ntpmsg
.trans_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
) {
497 log_debug("Invalid reply, returned times before epoch. Ignoring.");
498 return manager_connect(m
);
501 if (NTP_FIELD_LEAP(ntpmsg
.field
) == NTP_LEAP_NOTINSYNC
||
502 ntpmsg
.stratum
== 0 || ntpmsg
.stratum
>= 16) {
503 log_debug("Server is not synchronized. Disconnecting.");
504 return manager_connect(m
);
507 if (!IN_SET(NTP_FIELD_VERSION(ntpmsg
.field
), 3, 4)) {
508 log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg
.field
));
509 return manager_connect(m
);
512 if (NTP_FIELD_MODE(ntpmsg
.field
) != NTP_MODE_SERVER
) {
513 log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg
.field
));
514 return manager_connect(m
);
517 root_distance
= ntp_ts_short_to_d(&ntpmsg
.root_delay
) / 2 + ntp_ts_short_to_d(&ntpmsg
.root_dispersion
);
518 if (root_distance
> (double) m
->max_root_distance_usec
/ (double) USEC_PER_SEC
) {
519 log_debug("Server has too large root distance. Disconnecting.");
520 return manager_connect(m
);
525 m
->retry_interval
= 0;
528 manager_listen_stop(m
);
530 /* announce leap seconds */
531 if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_PLUSSEC
)
533 else if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_MINUSSEC
)
539 * "Timestamp Name ID When Generated
540 * ------------------------------------------------------------
541 * Originate Timestamp T1 time request sent by client
542 * Receive Timestamp T2 time request received by server
543 * Transmit Timestamp T3 time reply sent by server
544 * Destination Timestamp T4 time reply received by client
546 * The round-trip delay, d, and system clock offset, t, are defined as:
547 * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2"
549 origin
= ts_to_d(&m
->trans_time
) + OFFSET_1900_1970
;
550 receive
= ntp_ts_to_d(&ntpmsg
.recv_time
);
551 trans
= ntp_ts_to_d(&ntpmsg
.trans_time
);
552 dest
= ts_to_d(recv_time
) + OFFSET_1900_1970
;
554 offset
= ((receive
- origin
) + (trans
- dest
)) / 2;
555 delay
= (dest
- origin
) - (trans
- receive
);
557 spike
= manager_sample_spike_detection(m
, offset
, delay
);
559 manager_adjust_poll(m
, offset
, spike
);
561 log_debug("NTP response:\n"
566 " precision : %.6f sec (%d)\n"
567 " root distance: %.6f sec\n"
568 " reference : %.4s\n"
573 " offset : %+.3f sec\n"
574 " delay : %+.3f sec\n"
575 " packet count : %"PRIu64
"\n"
577 " poll interval: " USEC_FMT
"\n",
578 NTP_FIELD_LEAP(ntpmsg
.field
),
579 NTP_FIELD_VERSION(ntpmsg
.field
),
580 NTP_FIELD_MODE(ntpmsg
.field
),
582 exp2(ntpmsg
.precision
), ntpmsg
.precision
,
584 ntpmsg
.stratum
== 1 ? ntpmsg
.refid
: "n/a",
585 origin
- OFFSET_1900_1970
,
586 receive
- OFFSET_1900_1970
,
587 trans
- OFFSET_1900_1970
,
588 dest
- OFFSET_1900_1970
,
591 m
->samples_jitter
, spike
? " spike" : "",
592 m
->poll_interval_usec
/ USEC_PER_SEC
);
596 r
= manager_adjust_clock(m
, offset
, leap_sec
);
598 log_error_errno(r
, "Failed to call clock_adjtime(): %m");
601 /* Save NTP response */
603 m
->origin_time
= m
->trans_time
;
604 m
->dest_time
= *recv_time
;
607 log_debug("interval/delta/delay/jitter/drift " USEC_FMT
"s/%+.3fs/%.3fs/%.3fs/%+"PRIi64
"ppm%s",
608 m
->poll_interval_usec
/ USEC_PER_SEC
, offset
, delay
, m
->samples_jitter
, m
->drift_freq
/ 65536,
609 spike
? " (ignored)" : "");
611 (void) sd_bus_emit_properties_changed(m
->bus
, "/org/freedesktop/timesync1", "org.freedesktop.timesync1.Manager", "NTPMessage", NULL
);
614 _cleanup_free_
char *pretty
= NULL
;
618 server_address_pretty(m
->current_server_address
, &pretty
);
619 log_info("Synchronized to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
620 sd_notifyf(false, "STATUS=Synchronized to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
623 r
= manager_arm_timer(m
, m
->poll_interval_usec
);
625 return log_error_errno(r
, "Failed to rearm timer: %m");
630 static int manager_listen_setup(Manager
*m
) {
631 union sockaddr_union addr
= {};
636 if (m
->server_socket
>= 0)
639 assert(!m
->event_receive
);
640 assert(m
->current_server_address
);
642 addr
.sa
.sa_family
= m
->current_server_address
->sockaddr
.sa
.sa_family
;
644 m
->server_socket
= socket(addr
.sa
.sa_family
, SOCK_DGRAM
| SOCK_CLOEXEC
, 0);
645 if (m
->server_socket
< 0)
648 r
= bind(m
->server_socket
, &addr
.sa
, m
->current_server_address
->socklen
);
652 r
= setsockopt_int(m
->server_socket
, SOL_SOCKET
, SO_TIMESTAMPNS
, true);
656 (void) setsockopt_int(m
->server_socket
, IPPROTO_IP
, IP_TOS
, IPTOS_LOWDELAY
);
658 return sd_event_add_io(m
->event
, &m
->event_receive
, m
->server_socket
, EPOLLIN
, manager_receive_response
, m
);
661 static void manager_listen_stop(Manager
*m
) {
664 m
->event_receive
= sd_event_source_unref(m
->event_receive
);
665 m
->server_socket
= safe_close(m
->server_socket
);
668 static int manager_begin(Manager
*m
) {
669 _cleanup_free_
char *pretty
= NULL
;
673 assert_return(m
->current_server_name
, -EHOSTUNREACH
);
674 assert_return(m
->current_server_address
, -EHOSTUNREACH
);
677 m
->missed_replies
= NTP_MAX_MISSED_REPLIES
;
678 if (m
->poll_interval_usec
== 0)
679 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
681 server_address_pretty(m
->current_server_address
, &pretty
);
682 log_debug("Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
683 sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
685 r
= manager_clock_watch_setup(m
);
689 return manager_send_request(m
);
692 void manager_set_server_name(Manager
*m
, ServerName
*n
) {
695 if (m
->current_server_name
== n
)
698 m
->current_server_name
= n
;
699 m
->current_server_address
= NULL
;
701 manager_disconnect(m
);
704 log_debug("Selected server %s.", n
->string
);
707 void manager_set_server_address(Manager
*m
, ServerAddress
*a
) {
710 if (m
->current_server_address
== a
)
713 m
->current_server_address
= a
;
714 /* If a is NULL, we are just clearing the address, without
715 * changing the name. Keep the existing name in that case. */
717 m
->current_server_name
= a
->name
;
719 manager_disconnect(m
);
722 _cleanup_free_
char *pretty
= NULL
;
723 server_address_pretty(a
, &pretty
);
724 log_debug("Selected address %s of server %s.", strna(pretty
), a
->name
->string
);
728 static int manager_resolve_handler(sd_resolve_query
*q
, int ret
, const struct addrinfo
*ai
, void *userdata
) {
729 Manager
*m
= userdata
;
734 assert(m
->current_server_name
);
736 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
739 log_debug("Failed to resolve %s: %s", m
->current_server_name
->string
, gai_strerror(ret
));
742 return manager_connect(m
);
745 for (; ai
; ai
= ai
->ai_next
) {
746 _cleanup_free_
char *pretty
= NULL
;
750 assert(ai
->ai_addrlen
>= offsetof(struct sockaddr
, sa_data
));
752 if (!IN_SET(ai
->ai_addr
->sa_family
, AF_INET
, AF_INET6
)) {
753 log_warning("Unsuitable address protocol for %s", m
->current_server_name
->string
);
757 r
= server_address_new(m
->current_server_name
, &a
, (const union sockaddr_union
*) ai
->ai_addr
, ai
->ai_addrlen
);
759 return log_error_errno(r
, "Failed to add server address: %m");
761 server_address_pretty(a
, &pretty
);
762 log_debug("Resolved address %s for %s.", pretty
, m
->current_server_name
->string
);
765 if (!m
->current_server_name
->addresses
) {
766 log_error("Failed to find suitable address for host %s.", m
->current_server_name
->string
);
769 return manager_connect(m
);
772 manager_set_server_address(m
, m
->current_server_name
->addresses
);
774 return manager_begin(m
);
777 static int manager_retry_connect(sd_event_source
*source
, usec_t usec
, void *userdata
) {
778 Manager
*m
= userdata
;
782 return manager_connect(m
);
785 int manager_connect(Manager
*m
) {
790 manager_disconnect(m
);
792 m
->event_retry
= sd_event_source_unref(m
->event_retry
);
793 if (!ratelimit_below(&m
->ratelimit
)) {
794 log_debug("Delaying attempts to contact servers.");
796 r
= sd_event_add_time(m
->event
, &m
->event_retry
, clock_boottime_or_monotonic(), now(clock_boottime_or_monotonic()) + RETRY_USEC
, 0, manager_retry_connect
, m
);
798 return log_error_errno(r
, "Failed to create retry timer: %m");
803 /* If we already are operating on some address, switch to the
805 if (m
->current_server_address
&& m
->current_server_address
->addresses_next
)
806 manager_set_server_address(m
, m
->current_server_address
->addresses_next
);
808 struct addrinfo hints
= {
809 .ai_flags
= AI_NUMERICSERV
|AI_ADDRCONFIG
,
810 .ai_socktype
= SOCK_DGRAM
,
813 /* Hmm, we are through all addresses, let's look for the next host instead */
814 if (m
->current_server_name
&& m
->current_server_name
->names_next
)
815 manager_set_server_name(m
, m
->current_server_name
->names_next
);
820 /* Our current server name list is exhausted,
821 * let's find the next one to iterate. First
822 * we try the system list, then the link list.
823 * After having processed the link list we
824 * jump back to the system list. However, if
825 * both lists are empty, we change to the
827 if (!m
->current_server_name
|| m
->current_server_name
->type
== SERVER_LINK
) {
828 f
= m
->system_servers
;
834 f
= m
->system_servers
;
840 f
= m
->fallback_servers
;
843 manager_set_server_name(m
, NULL
);
844 log_debug("No server found.");
848 if (restart
&& !m
->exhausted_servers
&& m
->poll_interval_usec
) {
849 log_debug("Waiting after exhausting servers.");
850 r
= sd_event_add_time(m
->event
, &m
->event_retry
, clock_boottime_or_monotonic(), now(clock_boottime_or_monotonic()) + m
->poll_interval_usec
, 0, manager_retry_connect
, m
);
852 return log_error_errno(r
, "Failed to create retry timer: %m");
854 m
->exhausted_servers
= true;
856 /* Increase the polling interval */
857 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
858 m
->poll_interval_usec
*= 2;
863 m
->exhausted_servers
= false;
865 manager_set_server_name(m
, f
);
868 /* Tell the resolver to reread /etc/resolv.conf, in
869 * case it changed. */
872 /* Flush out any previously resolved addresses */
873 server_name_flush_addresses(m
->current_server_name
);
875 log_debug("Resolving %s...", m
->current_server_name
->string
);
877 r
= sd_resolve_getaddrinfo(m
->resolve
, &m
->resolve_query
, m
->current_server_name
->string
, "123", &hints
, manager_resolve_handler
, m
);
879 return log_error_errno(r
, "Failed to create resolver: %m");
884 r
= manager_begin(m
);
891 void manager_disconnect(Manager
*m
) {
894 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
896 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
898 manager_listen_stop(m
);
900 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
901 m
->clock_watch_fd
= safe_close(m
->clock_watch_fd
);
903 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
905 sd_notifyf(false, "STATUS=Idle.");
908 void manager_flush_server_names(Manager
*m
, ServerType t
) {
911 if (t
== SERVER_SYSTEM
)
912 while (m
->system_servers
)
913 server_name_free(m
->system_servers
);
915 if (t
== SERVER_LINK
)
916 while (m
->link_servers
)
917 server_name_free(m
->link_servers
);
919 if (t
== SERVER_FALLBACK
)
920 while (m
->fallback_servers
)
921 server_name_free(m
->fallback_servers
);
924 void manager_free(Manager
*m
) {
928 manager_disconnect(m
);
929 manager_flush_server_names(m
, SERVER_SYSTEM
);
930 manager_flush_server_names(m
, SERVER_LINK
);
931 manager_flush_server_names(m
, SERVER_FALLBACK
);
933 sd_event_source_unref(m
->event_retry
);
935 sd_event_source_unref(m
->network_event_source
);
936 sd_network_monitor_unref(m
->network_monitor
);
938 sd_resolve_unref(m
->resolve
);
939 sd_event_unref(m
->event
);
941 sd_bus_unref(m
->bus
);
946 static int manager_network_read_link_servers(Manager
*m
) {
947 _cleanup_strv_free_
char **ntp
= NULL
;
950 bool changed
= false;
955 r
= sd_network_get_ntp(&ntp
);
960 log_debug_errno(r
, "Failed to get link NTP servers: %m");
964 LIST_FOREACH(names
, n
, m
->link_servers
)
967 STRV_FOREACH(i
, ntp
) {
970 r
= dns_name_is_valid_or_address(*i
);
972 log_error_errno(r
, "Failed to check validity of NTP server name or address '%s': %m", *i
);
975 log_error("Invalid NTP server name or address, ignoring: %s", *i
);
979 LIST_FOREACH(names
, n
, m
->link_servers
)
980 if (streq(n
->string
, *i
)) {
987 r
= server_name_new(m
, NULL
, SERVER_LINK
, *i
);
997 LIST_FOREACH_SAFE(names
, n
, nx
, m
->link_servers
)
1006 manager_flush_server_names(m
, SERVER_LINK
);
1010 static bool manager_is_connected(Manager
*m
) {
1011 /* Return true when the manager is sending a request, resolving a server name, or
1012 * in a poll interval. */
1013 return m
->server_socket
>= 0 || m
->resolve_query
|| m
->event_timer
;
1016 static int manager_network_event_handler(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1017 Manager
*m
= userdata
;
1018 bool changed
, connected
, online
;
1023 sd_network_monitor_flush(m
->network_monitor
);
1025 /* When manager_network_read_link_servers() failed, we assume that the servers are changed. */
1026 changed
= !!manager_network_read_link_servers(m
);
1028 /* check if the machine is online */
1029 online
= network_is_online();
1031 /* check if the client is currently connected */
1032 connected
= manager_is_connected(m
);
1034 if (connected
&& !online
) {
1035 log_info("No network connectivity, watching for changes.");
1036 manager_disconnect(m
);
1038 } else if ((!connected
|| changed
) && online
) {
1039 log_info("Network configuration changed, trying to establish connection.");
1041 if (m
->current_server_address
)
1042 r
= manager_begin(m
);
1044 r
= manager_connect(m
);
1052 static int manager_network_monitor_listen(Manager
*m
) {
1057 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
1059 log_info("systemd does not appear to be running, not listening for systemd-networkd events.");
1065 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
1069 events
= sd_network_monitor_get_events(m
->network_monitor
);
1073 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, manager_network_event_handler
, m
);
1080 int manager_new(Manager
**ret
) {
1081 _cleanup_(manager_freep
) Manager
*m
= NULL
;
1086 m
= new0(Manager
, 1);
1090 m
->max_root_distance_usec
= NTP_MAX_ROOT_DISTANCE
;
1091 m
->poll_interval_min_usec
= NTP_POLL_INTERVAL_MIN_USEC
;
1092 m
->poll_interval_max_usec
= NTP_POLL_INTERVAL_MAX_USEC
;
1094 m
->server_socket
= m
->clock_watch_fd
= -1;
1096 RATELIMIT_INIT(m
->ratelimit
, RATELIMIT_INTERVAL_USEC
, RATELIMIT_BURST
);
1098 r
= sd_event_default(&m
->event
);
1102 (void) sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
1103 (void) sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
1105 (void) sd_event_set_watchdog(m
->event
, true);
1107 r
= sd_resolve_default(&m
->resolve
);
1111 r
= sd_resolve_attach_event(m
->resolve
, m
->event
, 0);
1115 r
= manager_network_monitor_listen(m
);
1119 (void) manager_network_read_link_servers(m
);