1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2014 Kay Sievers, Lennart Poettering
10 #include <netinet/in.h>
11 #include <netinet/ip.h>
14 #include <sys/socket.h>
15 #include <sys/timerfd.h>
16 #include <sys/timex.h>
17 #include <sys/types.h>
20 #include "sd-daemon.h"
22 #include "alloc-util.h"
28 #include "network-util.h"
29 #include "ratelimit.h"
30 #include "socket-util.h"
31 #include "string-util.h"
33 #include "time-util.h"
34 #include "timesyncd-conf.h"
35 #include "timesyncd-manager.h"
39 #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */
42 /* expected accuracy of time synchronization; used to adjust the poll interval */
43 #define NTP_ACCURACY_SEC 0.2
46 * Maximum delta in seconds which the system clock is gradually adjusted
47 * (slewed) to approach the network time. Deltas larger that this are set by
48 * letting the system time jump. The kernel's limit for adjtime is 0.5s.
50 #define NTP_MAX_ADJUST 0.4
52 /* Default of maximum acceptable root distance in microseconds. */
53 #define NTP_MAX_ROOT_DISTANCE (5 * USEC_PER_SEC)
55 /* Maximum number of missed replies before selecting another source. */
56 #define NTP_MAX_MISSED_REPLIES 2
58 #define RETRY_USEC (30*USEC_PER_SEC)
59 #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC)
60 #define RATELIMIT_BURST 10
62 #define TIMEOUT_USEC (10*USEC_PER_SEC)
64 static int manager_arm_timer(Manager
*m
, usec_t next
);
65 static int manager_clock_watch_setup(Manager
*m
);
66 static int manager_listen_setup(Manager
*m
);
67 static void manager_listen_stop(Manager
*m
);
69 static double ntp_ts_short_to_d(const struct ntp_ts_short
*ts
) {
70 return be16toh(ts
->sec
) + (be16toh(ts
->frac
) / 65536.0);
73 static double ntp_ts_to_d(const struct ntp_ts
*ts
) {
74 return be32toh(ts
->sec
) + ((double)be32toh(ts
->frac
) / UINT_MAX
);
77 static double ts_to_d(const struct timespec
*ts
) {
78 return ts
->tv_sec
+ (1.0e-9 * ts
->tv_nsec
);
81 static int manager_timeout(sd_event_source
*source
, usec_t usec
, void *userdata
) {
82 _cleanup_free_
char *pretty
= NULL
;
83 Manager
*m
= userdata
;
86 assert(m
->current_server_name
);
87 assert(m
->current_server_address
);
89 server_address_pretty(m
->current_server_address
, &pretty
);
90 log_info("Timed out waiting for reply from %s (%s).", strna(pretty
), m
->current_server_name
->string
);
92 return manager_connect(m
);
95 static int manager_send_request(Manager
*m
) {
96 _cleanup_free_
char *pretty
= NULL
;
97 struct ntp_msg ntpmsg
= {
99 * "The client initializes the NTP message header, sends the request
100 * to the server, and strips the time of day from the Transmit
101 * Timestamp field of the reply. For this purpose, all the NTP
102 * header fields are set to 0, except the Mode, VN, and optional
103 * Transmit Timestamp fields."
105 .field
= NTP_FIELD(0, 4, NTP_MODE_CLIENT
),
111 assert(m
->current_server_name
);
112 assert(m
->current_server_address
);
114 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
116 r
= manager_listen_setup(m
);
118 return log_warning_errno(r
, "Failed to setup connection socket: %m");
121 * Set transmit timestamp, remember it; the server will send that back
122 * as the origin timestamp and we have an indication that this is the
123 * matching answer to our request.
125 * The actual value does not matter, We do not care about the correct
126 * NTP UINT_MAX fraction; we just pass the plain nanosecond value.
128 assert_se(clock_gettime(clock_boottime_or_monotonic(), &m
->trans_time_mon
) >= 0);
129 assert_se(clock_gettime(CLOCK_REALTIME
, &m
->trans_time
) >= 0);
130 ntpmsg
.trans_time
.sec
= htobe32(m
->trans_time
.tv_sec
+ OFFSET_1900_1970
);
131 ntpmsg
.trans_time
.frac
= htobe32(m
->trans_time
.tv_nsec
);
133 server_address_pretty(m
->current_server_address
, &pretty
);
135 len
= sendto(m
->server_socket
, &ntpmsg
, sizeof(ntpmsg
), MSG_DONTWAIT
, &m
->current_server_address
->sockaddr
.sa
, m
->current_server_address
->socklen
);
136 if (len
== sizeof(ntpmsg
)) {
138 log_debug("Sent NTP request to %s (%s).", strna(pretty
), m
->current_server_name
->string
);
140 log_debug_errno(errno
, "Sending NTP request to %s (%s) failed: %m", strna(pretty
), m
->current_server_name
->string
);
141 return manager_connect(m
);
144 /* re-arm timer with increasing timeout, in case the packets never arrive back */
145 if (m
->retry_interval
> 0) {
146 if (m
->retry_interval
< m
->poll_interval_max_usec
)
147 m
->retry_interval
*= 2;
149 m
->retry_interval
= m
->poll_interval_min_usec
;
151 r
= manager_arm_timer(m
, m
->retry_interval
);
153 return log_error_errno(r
, "Failed to rearm timer: %m");
156 if (m
->missed_replies
> NTP_MAX_MISSED_REPLIES
) {
157 r
= sd_event_add_time(
160 clock_boottime_or_monotonic(),
161 now(clock_boottime_or_monotonic()) + TIMEOUT_USEC
, 0,
164 return log_error_errno(r
, "Failed to arm timeout timer: %m");
170 static int manager_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
171 Manager
*m
= userdata
;
175 return manager_send_request(m
);
178 static int manager_arm_timer(Manager
*m
, usec_t next
) {
184 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
188 if (m
->event_timer
) {
189 r
= sd_event_source_set_time(m
->event_timer
, now(clock_boottime_or_monotonic()) + next
);
193 return sd_event_source_set_enabled(m
->event_timer
, SD_EVENT_ONESHOT
);
196 return sd_event_add_time(
199 clock_boottime_or_monotonic(),
200 now(clock_boottime_or_monotonic()) + next
, 0,
204 static int manager_clock_watch(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
205 Manager
*m
= userdata
;
210 manager_clock_watch_setup(m
);
212 /* skip our own jumps */
219 log_debug("System time changed. Resyncing.");
220 m
->poll_resync
= true;
222 return manager_send_request(m
);
225 /* wake up when the system time changes underneath us */
226 static int manager_clock_watch_setup(Manager
*m
) {
231 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
232 safe_close(m
->clock_watch_fd
);
234 m
->clock_watch_fd
= time_change_fd();
235 if (m
->clock_watch_fd
< 0)
236 return log_error_errno(m
->clock_watch_fd
, "Failed to create timerfd: %m");
238 r
= sd_event_add_io(m
->event
, &m
->event_clock_watch
, m
->clock_watch_fd
, EPOLLIN
, manager_clock_watch
, m
);
240 return log_error_errno(r
, "Failed to create clock watch event source: %m");
245 static int manager_adjust_clock(Manager
*m
, double offset
, int leap_sec
) {
246 struct timex tmx
= {};
252 * For small deltas, tell the kernel to gradually adjust the system
253 * clock to the NTP time, larger deltas are just directly set.
255 if (fabs(offset
) < NTP_MAX_ADJUST
) {
256 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_OFFSET
| ADJ_TIMECONST
| ADJ_MAXERROR
| ADJ_ESTERROR
;
257 tmx
.status
= STA_PLL
;
258 tmx
.offset
= offset
* NSEC_PER_SEC
;
259 tmx
.constant
= log2i(m
->poll_interval_usec
/ USEC_PER_SEC
) - 4;
262 log_debug(" adjust (slew): %+.3f sec", offset
);
264 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_SETOFFSET
| ADJ_MAXERROR
| ADJ_ESTERROR
;
266 /* ADJ_NANO uses nanoseconds in the microseconds field */
267 tmx
.time
.tv_sec
= (long)offset
;
268 tmx
.time
.tv_usec
= (offset
- tmx
.time
.tv_sec
) * NSEC_PER_SEC
;
272 /* the kernel expects -0.3s as {-1, 7000.000.000} */
273 if (tmx
.time
.tv_usec
< 0) {
274 tmx
.time
.tv_sec
-= 1;
275 tmx
.time
.tv_usec
+= NSEC_PER_SEC
;
279 log_debug(" adjust (jump): %+.3f sec", offset
);
283 * An unset STA_UNSYNC will enable the kernel's 11-minute mode,
284 * which syncs the system time periodically to the RTC.
286 * In case the RTC runs in local time, never touch the RTC,
287 * we have no way to properly handle daylight saving changes and
288 * mobile devices moving between time zones.
290 if (m
->rtc_local_time
)
291 tmx
.status
|= STA_UNSYNC
;
295 tmx
.status
|= STA_INS
;
298 tmx
.status
|= STA_DEL
;
302 r
= clock_adjtime(CLOCK_REALTIME
, &tmx
);
306 /* If touch fails, there isn't much we can do. Maybe it'll work next time. */
307 (void) touch("/var/lib/systemd/timesync/clock");
308 (void) touch("/run/systemd/timesync/synchronized");
310 m
->drift_freq
= tmx
.freq
;
312 log_debug(" status : %04i %s\n"
313 " time now : %"PRI_TIME
".%03"PRI_USEC
"\n"
314 " constant : %"PRI_TIMEX
"\n"
315 " offset : %+.3f sec\n"
316 " freq offset : %+"PRI_TIMEX
" (%+"PRI_TIMEX
" ppm)\n",
317 tmx
.status
, tmx
.status
& STA_UNSYNC
? "unsync" : "sync",
318 tmx
.time
.tv_sec
, tmx
.time
.tv_usec
/ NSEC_PER_MSEC
,
320 (double)tmx
.offset
/ NSEC_PER_SEC
,
321 tmx
.freq
, tmx
.freq
/ 65536);
326 static bool manager_sample_spike_detection(Manager
*m
, double offset
, double delay
) {
327 unsigned int i
, idx_cur
, idx_new
, idx_min
;
335 /* ignore initial sample */
336 if (m
->packet_count
== 1)
339 /* store the current data in our samples array */
340 idx_cur
= m
->samples_idx
;
341 idx_new
= (idx_cur
+ 1) % ELEMENTSOF(m
->samples
);
342 m
->samples_idx
= idx_new
;
343 m
->samples
[idx_new
].offset
= offset
;
344 m
->samples
[idx_new
].delay
= delay
;
346 /* calculate new jitter value from the RMS differences relative to the lowest delay sample */
347 jitter
= m
->samples_jitter
;
348 for (idx_min
= idx_cur
, i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
349 if (m
->samples
[i
].delay
> 0 && m
->samples
[i
].delay
< m
->samples
[idx_min
].delay
)
353 for (i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
354 j
+= pow(m
->samples
[i
].offset
- m
->samples
[idx_min
].offset
, 2);
355 m
->samples_jitter
= sqrt(j
/ (ELEMENTSOF(m
->samples
) - 1));
357 /* ignore samples when resyncing */
361 /* always accept offset if we are farther off than the round-trip delay */
362 if (fabs(offset
) > delay
)
365 /* we need a few samples before looking at them */
366 if (m
->packet_count
< 4)
369 /* do not accept anything worse than the maximum possible error of the best sample */
370 if (fabs(offset
) > m
->samples
[idx_min
].delay
)
373 /* compare the difference between the current offset to the previous offset and jitter */
374 return fabs(offset
- m
->samples
[idx_cur
].offset
) > 3 * jitter
;
377 static void manager_adjust_poll(Manager
*m
, double offset
, bool spike
) {
380 if (m
->poll_resync
) {
381 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
382 m
->poll_resync
= false;
386 /* set to minimal poll interval */
387 if (!spike
&& fabs(offset
) > NTP_ACCURACY_SEC
) {
388 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
392 /* increase polling interval */
393 if (fabs(offset
) < NTP_ACCURACY_SEC
* 0.25) {
394 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
395 m
->poll_interval_usec
*= 2;
399 /* decrease polling interval */
400 if (spike
|| fabs(offset
) > NTP_ACCURACY_SEC
* 0.75) {
401 if (m
->poll_interval_usec
> m
->poll_interval_min_usec
)
402 m
->poll_interval_usec
/= 2;
407 static int manager_receive_response(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
408 Manager
*m
= userdata
;
409 struct ntp_msg ntpmsg
;
413 .iov_len
= sizeof(ntpmsg
),
416 struct cmsghdr cmsghdr
;
417 uint8_t buf
[CMSG_SPACE(sizeof(struct timeval
))];
419 union sockaddr_union server_addr
;
420 struct msghdr msghdr
= {
423 .msg_control
= &control
,
424 .msg_controllen
= sizeof(control
),
425 .msg_name
= &server_addr
,
426 .msg_namelen
= sizeof(server_addr
),
428 struct cmsghdr
*cmsg
;
429 struct timespec
*recv_time
= NULL
;
431 double origin
, receive
, trans
, dest
;
432 double delay
, offset
;
433 double root_distance
;
441 if (revents
& (EPOLLHUP
|EPOLLERR
)) {
442 log_warning("Server connection returned error.");
443 return manager_connect(m
);
446 len
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
);
451 log_warning("Error receiving message. Disconnecting.");
452 return manager_connect(m
);
455 /* Too short or too long packet? */
456 if (iov
.iov_len
< sizeof(struct ntp_msg
) || (msghdr
.msg_flags
& MSG_TRUNC
)) {
457 log_warning("Invalid response from server. Disconnecting.");
458 return manager_connect(m
);
461 if (!m
->current_server_name
||
462 !m
->current_server_address
||
463 !sockaddr_equal(&server_addr
, &m
->current_server_address
->sockaddr
)) {
464 log_debug("Response from unknown server.");
468 CMSG_FOREACH(cmsg
, &msghdr
) {
469 if (cmsg
->cmsg_level
!= SOL_SOCKET
)
472 switch (cmsg
->cmsg_type
) {
473 case SCM_TIMESTAMPNS
:
474 recv_time
= (struct timespec
*) CMSG_DATA(cmsg
);
479 log_error("Invalid packet timestamp.");
484 log_debug("Unexpected reply. Ignoring.");
488 m
->missed_replies
= 0;
490 /* check our "time cookie" (we just stored nanoseconds in the fraction field) */
491 if (be32toh(ntpmsg
.origin_time
.sec
) != m
->trans_time
.tv_sec
+ OFFSET_1900_1970
||
492 be32toh(ntpmsg
.origin_time
.frac
) != (unsigned long) m
->trans_time
.tv_nsec
) {
493 log_debug("Invalid reply; not our transmit time. Ignoring.");
497 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
499 if (be32toh(ntpmsg
.recv_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
||
500 be32toh(ntpmsg
.trans_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
) {
501 log_debug("Invalid reply, returned times before epoch. Ignoring.");
502 return manager_connect(m
);
505 if (NTP_FIELD_LEAP(ntpmsg
.field
) == NTP_LEAP_NOTINSYNC
||
506 ntpmsg
.stratum
== 0 || ntpmsg
.stratum
>= 16) {
507 log_debug("Server is not synchronized. Disconnecting.");
508 return manager_connect(m
);
511 if (!IN_SET(NTP_FIELD_VERSION(ntpmsg
.field
), 3, 4)) {
512 log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg
.field
));
513 return manager_connect(m
);
516 if (NTP_FIELD_MODE(ntpmsg
.field
) != NTP_MODE_SERVER
) {
517 log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg
.field
));
518 return manager_connect(m
);
521 root_distance
= ntp_ts_short_to_d(&ntpmsg
.root_delay
) / 2 + ntp_ts_short_to_d(&ntpmsg
.root_dispersion
);
522 if (root_distance
> (double) m
->max_root_distance_usec
/ (double) USEC_PER_SEC
) {
523 log_debug("Server has too large root distance. Disconnecting.");
524 return manager_connect(m
);
529 m
->retry_interval
= 0;
532 manager_listen_stop(m
);
534 /* announce leap seconds */
535 if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_PLUSSEC
)
537 else if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_MINUSSEC
)
543 * "Timestamp Name ID When Generated
544 * ------------------------------------------------------------
545 * Originate Timestamp T1 time request sent by client
546 * Receive Timestamp T2 time request received by server
547 * Transmit Timestamp T3 time reply sent by server
548 * Destination Timestamp T4 time reply received by client
550 * The round-trip delay, d, and system clock offset, t, are defined as:
551 * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2"
553 origin
= ts_to_d(&m
->trans_time
) + OFFSET_1900_1970
;
554 receive
= ntp_ts_to_d(&ntpmsg
.recv_time
);
555 trans
= ntp_ts_to_d(&ntpmsg
.trans_time
);
556 dest
= ts_to_d(recv_time
) + OFFSET_1900_1970
;
558 offset
= ((receive
- origin
) + (trans
- dest
)) / 2;
559 delay
= (dest
- origin
) - (trans
- receive
);
561 spike
= manager_sample_spike_detection(m
, offset
, delay
);
563 manager_adjust_poll(m
, offset
, spike
);
565 log_debug("NTP response:\n"
570 " precision : %.6f sec (%d)\n"
571 " root distance: %.6f sec\n"
572 " reference : %.4s\n"
577 " offset : %+.3f sec\n"
578 " delay : %+.3f sec\n"
579 " packet count : %"PRIu64
"\n"
581 " poll interval: " USEC_FMT
"\n",
582 NTP_FIELD_LEAP(ntpmsg
.field
),
583 NTP_FIELD_VERSION(ntpmsg
.field
),
584 NTP_FIELD_MODE(ntpmsg
.field
),
586 exp2(ntpmsg
.precision
), ntpmsg
.precision
,
588 ntpmsg
.stratum
== 1 ? ntpmsg
.refid
: "n/a",
589 origin
- OFFSET_1900_1970
,
590 receive
- OFFSET_1900_1970
,
591 trans
- OFFSET_1900_1970
,
592 dest
- OFFSET_1900_1970
,
595 m
->samples_jitter
, spike
? " spike" : "",
596 m
->poll_interval_usec
/ USEC_PER_SEC
);
600 r
= manager_adjust_clock(m
, offset
, leap_sec
);
602 log_error_errno(r
, "Failed to call clock_adjtime(): %m");
605 /* Save NTP response */
607 m
->origin_time
= m
->trans_time
;
608 m
->dest_time
= *recv_time
;
611 log_debug("interval/delta/delay/jitter/drift " USEC_FMT
"s/%+.3fs/%.3fs/%.3fs/%+"PRI_TIMEX
"ppm%s",
612 m
->poll_interval_usec
/ USEC_PER_SEC
, offset
, delay
, m
->samples_jitter
, m
->drift_freq
/ 65536,
613 spike
? " (ignored)" : "");
615 (void) sd_bus_emit_properties_changed(m
->bus
, "/org/freedesktop/timesync1", "org.freedesktop.timesync1.Manager", "NTPMessage", NULL
);
618 _cleanup_free_
char *pretty
= NULL
;
622 server_address_pretty(m
->current_server_address
, &pretty
);
623 log_info("Synchronized to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
624 sd_notifyf(false, "STATUS=Synchronized to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
627 r
= manager_arm_timer(m
, m
->poll_interval_usec
);
629 return log_error_errno(r
, "Failed to rearm timer: %m");
634 static int manager_listen_setup(Manager
*m
) {
635 union sockaddr_union addr
= {};
636 static const int tos
= IPTOS_LOWDELAY
;
637 static const int on
= 1;
642 if (m
->server_socket
>= 0)
645 assert(!m
->event_receive
);
646 assert(m
->current_server_address
);
648 addr
.sa
.sa_family
= m
->current_server_address
->sockaddr
.sa
.sa_family
;
650 m
->server_socket
= socket(addr
.sa
.sa_family
, SOCK_DGRAM
| SOCK_CLOEXEC
, 0);
651 if (m
->server_socket
< 0)
654 r
= bind(m
->server_socket
, &addr
.sa
, m
->current_server_address
->socklen
);
658 r
= setsockopt(m
->server_socket
, SOL_SOCKET
, SO_TIMESTAMPNS
, &on
, sizeof(on
));
662 (void) setsockopt(m
->server_socket
, IPPROTO_IP
, IP_TOS
, &tos
, sizeof(tos
));
664 return sd_event_add_io(m
->event
, &m
->event_receive
, m
->server_socket
, EPOLLIN
, manager_receive_response
, m
);
667 static void manager_listen_stop(Manager
*m
) {
670 m
->event_receive
= sd_event_source_unref(m
->event_receive
);
671 m
->server_socket
= safe_close(m
->server_socket
);
674 static int manager_begin(Manager
*m
) {
675 _cleanup_free_
char *pretty
= NULL
;
679 assert_return(m
->current_server_name
, -EHOSTUNREACH
);
680 assert_return(m
->current_server_address
, -EHOSTUNREACH
);
683 m
->missed_replies
= NTP_MAX_MISSED_REPLIES
;
684 if (m
->poll_interval_usec
== 0)
685 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
687 server_address_pretty(m
->current_server_address
, &pretty
);
688 log_debug("Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
689 sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
691 r
= manager_clock_watch_setup(m
);
695 return manager_send_request(m
);
698 void manager_set_server_name(Manager
*m
, ServerName
*n
) {
701 if (m
->current_server_name
== n
)
704 m
->current_server_name
= n
;
705 m
->current_server_address
= NULL
;
707 manager_disconnect(m
);
710 log_debug("Selected server %s.", n
->string
);
713 void manager_set_server_address(Manager
*m
, ServerAddress
*a
) {
716 if (m
->current_server_address
== a
)
719 m
->current_server_address
= a
;
720 /* If a is NULL, we are just clearing the address, without
721 * changing the name. Keep the existing name in that case. */
723 m
->current_server_name
= a
->name
;
725 manager_disconnect(m
);
728 _cleanup_free_
char *pretty
= NULL
;
729 server_address_pretty(a
, &pretty
);
730 log_debug("Selected address %s of server %s.", strna(pretty
), a
->name
->string
);
734 static int manager_resolve_handler(sd_resolve_query
*q
, int ret
, const struct addrinfo
*ai
, void *userdata
) {
735 Manager
*m
= userdata
;
740 assert(m
->current_server_name
);
742 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
745 log_debug("Failed to resolve %s: %s", m
->current_server_name
->string
, gai_strerror(ret
));
748 return manager_connect(m
);
751 for (; ai
; ai
= ai
->ai_next
) {
752 _cleanup_free_
char *pretty
= NULL
;
756 assert(ai
->ai_addrlen
>= offsetof(struct sockaddr
, sa_data
));
758 if (!IN_SET(ai
->ai_addr
->sa_family
, AF_INET
, AF_INET6
)) {
759 log_warning("Unsuitable address protocol for %s", m
->current_server_name
->string
);
763 r
= server_address_new(m
->current_server_name
, &a
, (const union sockaddr_union
*) ai
->ai_addr
, ai
->ai_addrlen
);
765 return log_error_errno(r
, "Failed to add server address: %m");
767 server_address_pretty(a
, &pretty
);
768 log_debug("Resolved address %s for %s.", pretty
, m
->current_server_name
->string
);
771 if (!m
->current_server_name
->addresses
) {
772 log_error("Failed to find suitable address for host %s.", m
->current_server_name
->string
);
775 return manager_connect(m
);
778 manager_set_server_address(m
, m
->current_server_name
->addresses
);
780 return manager_begin(m
);
783 static int manager_retry_connect(sd_event_source
*source
, usec_t usec
, void *userdata
) {
784 Manager
*m
= userdata
;
788 return manager_connect(m
);
791 int manager_connect(Manager
*m
) {
796 manager_disconnect(m
);
798 m
->event_retry
= sd_event_source_unref(m
->event_retry
);
799 if (!ratelimit_below(&m
->ratelimit
)) {
800 log_debug("Slowing down attempts to contact servers.");
802 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
);
804 return log_error_errno(r
, "Failed to create retry timer: %m");
809 /* If we already are operating on some address, switch to the
811 if (m
->current_server_address
&& m
->current_server_address
->addresses_next
)
812 manager_set_server_address(m
, m
->current_server_address
->addresses_next
);
814 struct addrinfo hints
= {
815 .ai_flags
= AI_NUMERICSERV
|AI_ADDRCONFIG
,
816 .ai_socktype
= SOCK_DGRAM
,
819 /* Hmm, we are through all addresses, let's look for the next host instead */
820 if (m
->current_server_name
&& m
->current_server_name
->names_next
)
821 manager_set_server_name(m
, m
->current_server_name
->names_next
);
826 /* Our current server name list is exhausted,
827 * let's find the next one to iterate. First
828 * we try the system list, then the link list.
829 * After having processed the link list we
830 * jump back to the system list. However, if
831 * both lists are empty, we change to the
833 if (!m
->current_server_name
|| m
->current_server_name
->type
== SERVER_LINK
) {
834 f
= m
->system_servers
;
840 f
= m
->system_servers
;
846 f
= m
->fallback_servers
;
849 manager_set_server_name(m
, NULL
);
850 log_debug("No server found.");
854 if (restart
&& !m
->exhausted_servers
&& m
->poll_interval_usec
) {
855 log_debug("Waiting after exhausting servers.");
856 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
);
858 return log_error_errno(r
, "Failed to create retry timer: %m");
860 m
->exhausted_servers
= true;
862 /* Increase the polling interval */
863 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
864 m
->poll_interval_usec
*= 2;
869 m
->exhausted_servers
= false;
871 manager_set_server_name(m
, f
);
874 /* Tell the resolver to reread /etc/resolv.conf, in
875 * case it changed. */
878 /* Flush out any previously resolved addresses */
879 server_name_flush_addresses(m
->current_server_name
);
881 log_debug("Resolving %s...", m
->current_server_name
->string
);
883 r
= sd_resolve_getaddrinfo(m
->resolve
, &m
->resolve_query
, m
->current_server_name
->string
, "123", &hints
, manager_resolve_handler
, m
);
885 return log_error_errno(r
, "Failed to create resolver: %m");
890 r
= manager_begin(m
);
897 void manager_disconnect(Manager
*m
) {
900 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
902 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
904 manager_listen_stop(m
);
906 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
907 m
->clock_watch_fd
= safe_close(m
->clock_watch_fd
);
909 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
911 sd_notifyf(false, "STATUS=Idle.");
914 void manager_flush_server_names(Manager
*m
, ServerType t
) {
917 if (t
== SERVER_SYSTEM
)
918 while (m
->system_servers
)
919 server_name_free(m
->system_servers
);
921 if (t
== SERVER_LINK
)
922 while (m
->link_servers
)
923 server_name_free(m
->link_servers
);
925 if (t
== SERVER_FALLBACK
)
926 while (m
->fallback_servers
)
927 server_name_free(m
->fallback_servers
);
930 void manager_free(Manager
*m
) {
934 manager_disconnect(m
);
935 manager_flush_server_names(m
, SERVER_SYSTEM
);
936 manager_flush_server_names(m
, SERVER_LINK
);
937 manager_flush_server_names(m
, SERVER_FALLBACK
);
939 sd_event_source_unref(m
->event_retry
);
941 sd_event_source_unref(m
->network_event_source
);
942 sd_network_monitor_unref(m
->network_monitor
);
944 sd_resolve_unref(m
->resolve
);
945 sd_event_unref(m
->event
);
947 sd_bus_unref(m
->bus
);
952 static int manager_network_read_link_servers(Manager
*m
) {
953 _cleanup_strv_free_
char **ntp
= NULL
;
956 bool changed
= false;
961 r
= sd_network_get_ntp(&ntp
);
965 LIST_FOREACH(names
, n
, m
->link_servers
)
968 STRV_FOREACH(i
, ntp
) {
971 LIST_FOREACH(names
, n
, m
->link_servers
)
972 if (streq(n
->string
, *i
)) {
979 r
= server_name_new(m
, NULL
, SERVER_LINK
, *i
);
987 LIST_FOREACH_SAFE(names
, n
, nx
, m
->link_servers
)
996 manager_flush_server_names(m
, SERVER_LINK
);
1000 static bool manager_is_connected(Manager
*m
) {
1001 /* Return true when the manager is sending a request, resolving a server name, or
1002 * in a poll interval. */
1003 return m
->server_socket
>= 0 || m
->resolve_query
|| m
->event_timer
;
1006 static int manager_network_event_handler(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1007 Manager
*m
= userdata
;
1008 bool changed
, connected
, online
;
1013 sd_network_monitor_flush(m
->network_monitor
);
1015 changed
= !!manager_network_read_link_servers(m
);
1017 /* check if the machine is online */
1018 online
= network_is_online();
1020 /* check if the client is currently connected */
1021 connected
= manager_is_connected(m
);
1023 if (connected
&& !online
) {
1024 log_info("No network connectivity, watching for changes.");
1025 manager_disconnect(m
);
1027 } else if ((!connected
|| changed
) && online
) {
1028 log_info("Network configuration changed, trying to establish connection.");
1030 if (m
->current_server_address
)
1031 r
= manager_begin(m
);
1033 r
= manager_connect(m
);
1041 static int manager_network_monitor_listen(Manager
*m
) {
1046 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
1048 log_info("systemd does not appear to be running, not listening for systemd-networkd events.");
1054 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
1058 events
= sd_network_monitor_get_events(m
->network_monitor
);
1062 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, manager_network_event_handler
, m
);
1069 int manager_new(Manager
**ret
) {
1070 _cleanup_(manager_freep
) Manager
*m
= NULL
;
1075 m
= new0(Manager
, 1);
1079 m
->max_root_distance_usec
= NTP_MAX_ROOT_DISTANCE
;
1080 m
->poll_interval_min_usec
= NTP_POLL_INTERVAL_MIN_USEC
;
1081 m
->poll_interval_max_usec
= NTP_POLL_INTERVAL_MAX_USEC
;
1083 m
->server_socket
= m
->clock_watch_fd
= -1;
1085 RATELIMIT_INIT(m
->ratelimit
, RATELIMIT_INTERVAL_USEC
, RATELIMIT_BURST
);
1087 r
= sd_event_default(&m
->event
);
1091 sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
1092 sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
1094 sd_event_set_watchdog(m
->event
, true);
1096 r
= sd_resolve_default(&m
->resolve
);
1100 r
= sd_resolve_attach_event(m
->resolve
, m
->event
, 0);
1104 r
= manager_network_monitor_listen(m
);
1108 manager_network_read_link_servers(m
);