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"
23 #include "dns-domain.h"
29 #include "network-util.h"
30 #include "ratelimit.h"
31 #include "socket-util.h"
32 #include "string-util.h"
34 #include "time-util.h"
35 #include "timesyncd-conf.h"
36 #include "timesyncd-manager.h"
40 #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */
43 /* expected accuracy of time synchronization; used to adjust the poll interval */
44 #define NTP_ACCURACY_SEC 0.2
47 * Maximum delta in seconds which the system clock is gradually adjusted
48 * (slewed) to approach the network time. Deltas larger that this are set by
49 * letting the system time jump. The kernel's limit for adjtime is 0.5s.
51 #define NTP_MAX_ADJUST 0.4
53 /* Default of maximum acceptable root distance in microseconds. */
54 #define NTP_MAX_ROOT_DISTANCE (5 * USEC_PER_SEC)
56 /* Maximum number of missed replies before selecting another source. */
57 #define NTP_MAX_MISSED_REPLIES 2
59 #define RETRY_USEC (30*USEC_PER_SEC)
60 #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC)
61 #define RATELIMIT_BURST 10
63 #define TIMEOUT_USEC (10*USEC_PER_SEC)
65 static int manager_arm_timer(Manager
*m
, usec_t next
);
66 static int manager_clock_watch_setup(Manager
*m
);
67 static int manager_listen_setup(Manager
*m
);
68 static void manager_listen_stop(Manager
*m
);
70 static double ntp_ts_short_to_d(const struct ntp_ts_short
*ts
) {
71 return be16toh(ts
->sec
) + (be16toh(ts
->frac
) / 65536.0);
74 static double ntp_ts_to_d(const struct ntp_ts
*ts
) {
75 return be32toh(ts
->sec
) + ((double)be32toh(ts
->frac
) / UINT_MAX
);
78 static double ts_to_d(const struct timespec
*ts
) {
79 return ts
->tv_sec
+ (1.0e-9 * ts
->tv_nsec
);
82 static int manager_timeout(sd_event_source
*source
, usec_t usec
, void *userdata
) {
83 _cleanup_free_
char *pretty
= NULL
;
84 Manager
*m
= userdata
;
87 assert(m
->current_server_name
);
88 assert(m
->current_server_address
);
90 server_address_pretty(m
->current_server_address
, &pretty
);
91 log_info("Timed out waiting for reply from %s (%s).", strna(pretty
), m
->current_server_name
->string
);
93 return manager_connect(m
);
96 static int manager_send_request(Manager
*m
) {
97 _cleanup_free_
char *pretty
= NULL
;
98 struct ntp_msg ntpmsg
= {
100 * "The client initializes the NTP message header, sends the request
101 * to the server, and strips the time of day from the Transmit
102 * Timestamp field of the reply. For this purpose, all the NTP
103 * header fields are set to 0, except the Mode, VN, and optional
104 * Transmit Timestamp fields."
106 .field
= NTP_FIELD(0, 4, NTP_MODE_CLIENT
),
112 assert(m
->current_server_name
);
113 assert(m
->current_server_address
);
115 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
117 r
= manager_listen_setup(m
);
119 return log_warning_errno(r
, "Failed to setup connection socket: %m");
122 * Set transmit timestamp, remember it; the server will send that back
123 * as the origin timestamp and we have an indication that this is the
124 * matching answer to our request.
126 * The actual value does not matter, We do not care about the correct
127 * NTP UINT_MAX fraction; we just pass the plain nanosecond value.
129 assert_se(clock_gettime(clock_boottime_or_monotonic(), &m
->trans_time_mon
) >= 0);
130 assert_se(clock_gettime(CLOCK_REALTIME
, &m
->trans_time
) >= 0);
131 ntpmsg
.trans_time
.sec
= htobe32(m
->trans_time
.tv_sec
+ OFFSET_1900_1970
);
132 ntpmsg
.trans_time
.frac
= htobe32(m
->trans_time
.tv_nsec
);
134 server_address_pretty(m
->current_server_address
, &pretty
);
136 len
= sendto(m
->server_socket
, &ntpmsg
, sizeof(ntpmsg
), MSG_DONTWAIT
, &m
->current_server_address
->sockaddr
.sa
, m
->current_server_address
->socklen
);
137 if (len
== sizeof(ntpmsg
)) {
139 log_debug("Sent NTP request to %s (%s).", strna(pretty
), m
->current_server_name
->string
);
141 log_debug_errno(errno
, "Sending NTP request to %s (%s) failed: %m", strna(pretty
), m
->current_server_name
->string
);
142 return manager_connect(m
);
145 /* re-arm timer with increasing timeout, in case the packets never arrive back */
146 if (m
->retry_interval
> 0) {
147 if (m
->retry_interval
< m
->poll_interval_max_usec
)
148 m
->retry_interval
*= 2;
150 m
->retry_interval
= m
->poll_interval_min_usec
;
152 r
= manager_arm_timer(m
, m
->retry_interval
);
154 return log_error_errno(r
, "Failed to rearm timer: %m");
157 if (m
->missed_replies
> NTP_MAX_MISSED_REPLIES
) {
158 r
= sd_event_add_time(
161 clock_boottime_or_monotonic(),
162 now(clock_boottime_or_monotonic()) + TIMEOUT_USEC
, 0,
165 return log_error_errno(r
, "Failed to arm timeout timer: %m");
171 static int manager_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
172 Manager
*m
= userdata
;
176 return manager_send_request(m
);
179 static int manager_arm_timer(Manager
*m
, usec_t next
) {
185 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
189 if (m
->event_timer
) {
190 r
= sd_event_source_set_time(m
->event_timer
, now(clock_boottime_or_monotonic()) + next
);
194 return sd_event_source_set_enabled(m
->event_timer
, SD_EVENT_ONESHOT
);
197 return sd_event_add_time(
200 clock_boottime_or_monotonic(),
201 now(clock_boottime_or_monotonic()) + next
, 0,
205 static int manager_clock_watch(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
206 Manager
*m
= userdata
;
211 manager_clock_watch_setup(m
);
213 /* skip our own jumps */
220 log_debug("System time changed. Resyncing.");
221 m
->poll_resync
= true;
223 return manager_send_request(m
);
226 /* wake up when the system time changes underneath us */
227 static int manager_clock_watch_setup(Manager
*m
) {
232 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
233 safe_close(m
->clock_watch_fd
);
235 m
->clock_watch_fd
= time_change_fd();
236 if (m
->clock_watch_fd
< 0)
237 return log_error_errno(m
->clock_watch_fd
, "Failed to create timerfd: %m");
239 r
= sd_event_add_io(m
->event
, &m
->event_clock_watch
, m
->clock_watch_fd
, EPOLLIN
, manager_clock_watch
, m
);
241 return log_error_errno(r
, "Failed to create clock watch event source: %m");
246 static int manager_adjust_clock(Manager
*m
, double offset
, int leap_sec
) {
247 struct timex tmx
= {};
253 * For small deltas, tell the kernel to gradually adjust the system
254 * clock to the NTP time, larger deltas are just directly set.
256 if (fabs(offset
) < NTP_MAX_ADJUST
) {
257 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_OFFSET
| ADJ_TIMECONST
| ADJ_MAXERROR
| ADJ_ESTERROR
;
258 tmx
.status
= STA_PLL
;
259 tmx
.offset
= offset
* NSEC_PER_SEC
;
260 tmx
.constant
= log2i(m
->poll_interval_usec
/ USEC_PER_SEC
) - 4;
263 log_debug(" adjust (slew): %+.3f sec", offset
);
265 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_SETOFFSET
| ADJ_MAXERROR
| ADJ_ESTERROR
;
267 /* ADJ_NANO uses nanoseconds in the microseconds field */
268 tmx
.time
.tv_sec
= (long)offset
;
269 tmx
.time
.tv_usec
= (offset
- tmx
.time
.tv_sec
) * NSEC_PER_SEC
;
273 /* the kernel expects -0.3s as {-1, 7000.000.000} */
274 if (tmx
.time
.tv_usec
< 0) {
275 tmx
.time
.tv_sec
-= 1;
276 tmx
.time
.tv_usec
+= NSEC_PER_SEC
;
280 log_debug(" adjust (jump): %+.3f sec", offset
);
284 * An unset STA_UNSYNC will enable the kernel's 11-minute mode,
285 * which syncs the system time periodically to the RTC.
287 * In case the RTC runs in local time, never touch the RTC,
288 * we have no way to properly handle daylight saving changes and
289 * mobile devices moving between time zones.
291 if (m
->rtc_local_time
)
292 tmx
.status
|= STA_UNSYNC
;
296 tmx
.status
|= STA_INS
;
299 tmx
.status
|= STA_DEL
;
303 r
= clock_adjtime(CLOCK_REALTIME
, &tmx
);
307 /* If touch fails, there isn't much we can do. Maybe it'll work next time. */
308 (void) touch("/var/lib/systemd/timesync/clock");
309 (void) touch("/run/systemd/timesync/synchronized");
311 m
->drift_freq
= tmx
.freq
;
313 log_debug(" status : %04i %s\n"
314 " time now : %"PRI_TIME
".%03"PRI_USEC
"\n"
315 " constant : %"PRI_TIMEX
"\n"
316 " offset : %+.3f sec\n"
317 " freq offset : %+"PRI_TIMEX
" (%+"PRI_TIMEX
" ppm)\n",
318 tmx
.status
, tmx
.status
& STA_UNSYNC
? "unsync" : "sync",
319 tmx
.time
.tv_sec
, tmx
.time
.tv_usec
/ NSEC_PER_MSEC
,
321 (double)tmx
.offset
/ NSEC_PER_SEC
,
322 tmx
.freq
, tmx
.freq
/ 65536);
327 static bool manager_sample_spike_detection(Manager
*m
, double offset
, double delay
) {
328 unsigned int i
, idx_cur
, idx_new
, idx_min
;
336 /* ignore initial sample */
337 if (m
->packet_count
== 1)
340 /* store the current data in our samples array */
341 idx_cur
= m
->samples_idx
;
342 idx_new
= (idx_cur
+ 1) % ELEMENTSOF(m
->samples
);
343 m
->samples_idx
= idx_new
;
344 m
->samples
[idx_new
].offset
= offset
;
345 m
->samples
[idx_new
].delay
= delay
;
347 /* calculate new jitter value from the RMS differences relative to the lowest delay sample */
348 jitter
= m
->samples_jitter
;
349 for (idx_min
= idx_cur
, i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
350 if (m
->samples
[i
].delay
> 0 && m
->samples
[i
].delay
< m
->samples
[idx_min
].delay
)
354 for (i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
355 j
+= pow(m
->samples
[i
].offset
- m
->samples
[idx_min
].offset
, 2);
356 m
->samples_jitter
= sqrt(j
/ (ELEMENTSOF(m
->samples
) - 1));
358 /* ignore samples when resyncing */
362 /* always accept offset if we are farther off than the round-trip delay */
363 if (fabs(offset
) > delay
)
366 /* we need a few samples before looking at them */
367 if (m
->packet_count
< 4)
370 /* do not accept anything worse than the maximum possible error of the best sample */
371 if (fabs(offset
) > m
->samples
[idx_min
].delay
)
374 /* compare the difference between the current offset to the previous offset and jitter */
375 return fabs(offset
- m
->samples
[idx_cur
].offset
) > 3 * jitter
;
378 static void manager_adjust_poll(Manager
*m
, double offset
, bool spike
) {
381 if (m
->poll_resync
) {
382 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
383 m
->poll_resync
= false;
387 /* set to minimal poll interval */
388 if (!spike
&& fabs(offset
) > NTP_ACCURACY_SEC
) {
389 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
393 /* increase polling interval */
394 if (fabs(offset
) < NTP_ACCURACY_SEC
* 0.25) {
395 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
396 m
->poll_interval_usec
*= 2;
400 /* decrease polling interval */
401 if (spike
|| fabs(offset
) > NTP_ACCURACY_SEC
* 0.75) {
402 if (m
->poll_interval_usec
> m
->poll_interval_min_usec
)
403 m
->poll_interval_usec
/= 2;
408 static int manager_receive_response(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
409 Manager
*m
= userdata
;
410 struct ntp_msg ntpmsg
;
414 .iov_len
= sizeof(ntpmsg
),
417 struct cmsghdr cmsghdr
;
418 uint8_t buf
[CMSG_SPACE(sizeof(struct timeval
))];
420 union sockaddr_union server_addr
;
421 struct msghdr msghdr
= {
424 .msg_control
= &control
,
425 .msg_controllen
= sizeof(control
),
426 .msg_name
= &server_addr
,
427 .msg_namelen
= sizeof(server_addr
),
429 struct cmsghdr
*cmsg
;
430 struct timespec
*recv_time
= NULL
;
432 double origin
, receive
, trans
, dest
;
433 double delay
, offset
;
434 double root_distance
;
442 if (revents
& (EPOLLHUP
|EPOLLERR
)) {
443 log_warning("Server connection returned error.");
444 return manager_connect(m
);
447 len
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
);
452 log_warning("Error receiving message. Disconnecting.");
453 return manager_connect(m
);
456 /* Too short or too long packet? */
457 if (iov
.iov_len
< sizeof(struct ntp_msg
) || (msghdr
.msg_flags
& MSG_TRUNC
)) {
458 log_warning("Invalid response from server. Disconnecting.");
459 return manager_connect(m
);
462 if (!m
->current_server_name
||
463 !m
->current_server_address
||
464 !sockaddr_equal(&server_addr
, &m
->current_server_address
->sockaddr
)) {
465 log_debug("Response from unknown server.");
469 CMSG_FOREACH(cmsg
, &msghdr
) {
470 if (cmsg
->cmsg_level
!= SOL_SOCKET
)
473 switch (cmsg
->cmsg_type
) {
474 case SCM_TIMESTAMPNS
:
475 recv_time
= (struct timespec
*) CMSG_DATA(cmsg
);
480 log_error("Invalid packet timestamp.");
485 log_debug("Unexpected reply. Ignoring.");
489 m
->missed_replies
= 0;
491 /* check our "time cookie" (we just stored nanoseconds in the fraction field) */
492 if (be32toh(ntpmsg
.origin_time
.sec
) != m
->trans_time
.tv_sec
+ OFFSET_1900_1970
||
493 be32toh(ntpmsg
.origin_time
.frac
) != (unsigned long) m
->trans_time
.tv_nsec
) {
494 log_debug("Invalid reply; not our transmit time. Ignoring.");
498 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
500 if (be32toh(ntpmsg
.recv_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
||
501 be32toh(ntpmsg
.trans_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
) {
502 log_debug("Invalid reply, returned times before epoch. Ignoring.");
503 return manager_connect(m
);
506 if (NTP_FIELD_LEAP(ntpmsg
.field
) == NTP_LEAP_NOTINSYNC
||
507 ntpmsg
.stratum
== 0 || ntpmsg
.stratum
>= 16) {
508 log_debug("Server is not synchronized. Disconnecting.");
509 return manager_connect(m
);
512 if (!IN_SET(NTP_FIELD_VERSION(ntpmsg
.field
), 3, 4)) {
513 log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg
.field
));
514 return manager_connect(m
);
517 if (NTP_FIELD_MODE(ntpmsg
.field
) != NTP_MODE_SERVER
) {
518 log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg
.field
));
519 return manager_connect(m
);
522 root_distance
= ntp_ts_short_to_d(&ntpmsg
.root_delay
) / 2 + ntp_ts_short_to_d(&ntpmsg
.root_dispersion
);
523 if (root_distance
> (double) m
->max_root_distance_usec
/ (double) USEC_PER_SEC
) {
524 log_debug("Server has too large root distance. Disconnecting.");
525 return manager_connect(m
);
530 m
->retry_interval
= 0;
533 manager_listen_stop(m
);
535 /* announce leap seconds */
536 if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_PLUSSEC
)
538 else if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_MINUSSEC
)
544 * "Timestamp Name ID When Generated
545 * ------------------------------------------------------------
546 * Originate Timestamp T1 time request sent by client
547 * Receive Timestamp T2 time request received by server
548 * Transmit Timestamp T3 time reply sent by server
549 * Destination Timestamp T4 time reply received by client
551 * The round-trip delay, d, and system clock offset, t, are defined as:
552 * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2"
554 origin
= ts_to_d(&m
->trans_time
) + OFFSET_1900_1970
;
555 receive
= ntp_ts_to_d(&ntpmsg
.recv_time
);
556 trans
= ntp_ts_to_d(&ntpmsg
.trans_time
);
557 dest
= ts_to_d(recv_time
) + OFFSET_1900_1970
;
559 offset
= ((receive
- origin
) + (trans
- dest
)) / 2;
560 delay
= (dest
- origin
) - (trans
- receive
);
562 spike
= manager_sample_spike_detection(m
, offset
, delay
);
564 manager_adjust_poll(m
, offset
, spike
);
566 log_debug("NTP response:\n"
571 " precision : %.6f sec (%d)\n"
572 " root distance: %.6f sec\n"
573 " reference : %.4s\n"
578 " offset : %+.3f sec\n"
579 " delay : %+.3f sec\n"
580 " packet count : %"PRIu64
"\n"
582 " poll interval: " USEC_FMT
"\n",
583 NTP_FIELD_LEAP(ntpmsg
.field
),
584 NTP_FIELD_VERSION(ntpmsg
.field
),
585 NTP_FIELD_MODE(ntpmsg
.field
),
587 exp2(ntpmsg
.precision
), ntpmsg
.precision
,
589 ntpmsg
.stratum
== 1 ? ntpmsg
.refid
: "n/a",
590 origin
- OFFSET_1900_1970
,
591 receive
- OFFSET_1900_1970
,
592 trans
- OFFSET_1900_1970
,
593 dest
- OFFSET_1900_1970
,
596 m
->samples_jitter
, spike
? " spike" : "",
597 m
->poll_interval_usec
/ USEC_PER_SEC
);
601 r
= manager_adjust_clock(m
, offset
, leap_sec
);
603 log_error_errno(r
, "Failed to call clock_adjtime(): %m");
606 /* Save NTP response */
608 m
->origin_time
= m
->trans_time
;
609 m
->dest_time
= *recv_time
;
612 log_debug("interval/delta/delay/jitter/drift " USEC_FMT
"s/%+.3fs/%.3fs/%.3fs/%+"PRI_TIMEX
"ppm%s",
613 m
->poll_interval_usec
/ USEC_PER_SEC
, offset
, delay
, m
->samples_jitter
, m
->drift_freq
/ 65536,
614 spike
? " (ignored)" : "");
616 (void) sd_bus_emit_properties_changed(m
->bus
, "/org/freedesktop/timesync1", "org.freedesktop.timesync1.Manager", "NTPMessage", NULL
);
619 _cleanup_free_
char *pretty
= NULL
;
623 server_address_pretty(m
->current_server_address
, &pretty
);
624 log_info("Synchronized to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
625 sd_notifyf(false, "STATUS=Synchronized to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
628 r
= manager_arm_timer(m
, m
->poll_interval_usec
);
630 return log_error_errno(r
, "Failed to rearm timer: %m");
635 static int manager_listen_setup(Manager
*m
) {
636 union sockaddr_union addr
= {};
637 static const int tos
= IPTOS_LOWDELAY
;
638 static const int on
= 1;
643 if (m
->server_socket
>= 0)
646 assert(!m
->event_receive
);
647 assert(m
->current_server_address
);
649 addr
.sa
.sa_family
= m
->current_server_address
->sockaddr
.sa
.sa_family
;
651 m
->server_socket
= socket(addr
.sa
.sa_family
, SOCK_DGRAM
| SOCK_CLOEXEC
, 0);
652 if (m
->server_socket
< 0)
655 r
= bind(m
->server_socket
, &addr
.sa
, m
->current_server_address
->socklen
);
659 r
= setsockopt(m
->server_socket
, SOL_SOCKET
, SO_TIMESTAMPNS
, &on
, sizeof(on
));
663 (void) setsockopt(m
->server_socket
, IPPROTO_IP
, IP_TOS
, &tos
, sizeof(tos
));
665 return sd_event_add_io(m
->event
, &m
->event_receive
, m
->server_socket
, EPOLLIN
, manager_receive_response
, m
);
668 static void manager_listen_stop(Manager
*m
) {
671 m
->event_receive
= sd_event_source_unref(m
->event_receive
);
672 m
->server_socket
= safe_close(m
->server_socket
);
675 static int manager_begin(Manager
*m
) {
676 _cleanup_free_
char *pretty
= NULL
;
680 assert_return(m
->current_server_name
, -EHOSTUNREACH
);
681 assert_return(m
->current_server_address
, -EHOSTUNREACH
);
684 m
->missed_replies
= NTP_MAX_MISSED_REPLIES
;
685 if (m
->poll_interval_usec
== 0)
686 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
688 server_address_pretty(m
->current_server_address
, &pretty
);
689 log_debug("Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
690 sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
692 r
= manager_clock_watch_setup(m
);
696 return manager_send_request(m
);
699 void manager_set_server_name(Manager
*m
, ServerName
*n
) {
702 if (m
->current_server_name
== n
)
705 m
->current_server_name
= n
;
706 m
->current_server_address
= NULL
;
708 manager_disconnect(m
);
711 log_debug("Selected server %s.", n
->string
);
714 void manager_set_server_address(Manager
*m
, ServerAddress
*a
) {
717 if (m
->current_server_address
== a
)
720 m
->current_server_address
= a
;
721 /* If a is NULL, we are just clearing the address, without
722 * changing the name. Keep the existing name in that case. */
724 m
->current_server_name
= a
->name
;
726 manager_disconnect(m
);
729 _cleanup_free_
char *pretty
= NULL
;
730 server_address_pretty(a
, &pretty
);
731 log_debug("Selected address %s of server %s.", strna(pretty
), a
->name
->string
);
735 static int manager_resolve_handler(sd_resolve_query
*q
, int ret
, const struct addrinfo
*ai
, void *userdata
) {
736 Manager
*m
= userdata
;
741 assert(m
->current_server_name
);
743 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
746 log_debug("Failed to resolve %s: %s", m
->current_server_name
->string
, gai_strerror(ret
));
749 return manager_connect(m
);
752 for (; ai
; ai
= ai
->ai_next
) {
753 _cleanup_free_
char *pretty
= NULL
;
757 assert(ai
->ai_addrlen
>= offsetof(struct sockaddr
, sa_data
));
759 if (!IN_SET(ai
->ai_addr
->sa_family
, AF_INET
, AF_INET6
)) {
760 log_warning("Unsuitable address protocol for %s", m
->current_server_name
->string
);
764 r
= server_address_new(m
->current_server_name
, &a
, (const union sockaddr_union
*) ai
->ai_addr
, ai
->ai_addrlen
);
766 return log_error_errno(r
, "Failed to add server address: %m");
768 server_address_pretty(a
, &pretty
);
769 log_debug("Resolved address %s for %s.", pretty
, m
->current_server_name
->string
);
772 if (!m
->current_server_name
->addresses
) {
773 log_error("Failed to find suitable address for host %s.", m
->current_server_name
->string
);
776 return manager_connect(m
);
779 manager_set_server_address(m
, m
->current_server_name
->addresses
);
781 return manager_begin(m
);
784 static int manager_retry_connect(sd_event_source
*source
, usec_t usec
, void *userdata
) {
785 Manager
*m
= userdata
;
789 return manager_connect(m
);
792 int manager_connect(Manager
*m
) {
797 manager_disconnect(m
);
799 m
->event_retry
= sd_event_source_unref(m
->event_retry
);
800 if (!ratelimit_below(&m
->ratelimit
)) {
801 log_debug("Slowing down attempts to contact servers.");
803 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
);
805 return log_error_errno(r
, "Failed to create retry timer: %m");
810 /* If we already are operating on some address, switch to the
812 if (m
->current_server_address
&& m
->current_server_address
->addresses_next
)
813 manager_set_server_address(m
, m
->current_server_address
->addresses_next
);
815 struct addrinfo hints
= {
816 .ai_flags
= AI_NUMERICSERV
|AI_ADDRCONFIG
,
817 .ai_socktype
= SOCK_DGRAM
,
820 /* Hmm, we are through all addresses, let's look for the next host instead */
821 if (m
->current_server_name
&& m
->current_server_name
->names_next
)
822 manager_set_server_name(m
, m
->current_server_name
->names_next
);
827 /* Our current server name list is exhausted,
828 * let's find the next one to iterate. First
829 * we try the system list, then the link list.
830 * After having processed the link list we
831 * jump back to the system list. However, if
832 * both lists are empty, we change to the
834 if (!m
->current_server_name
|| m
->current_server_name
->type
== SERVER_LINK
) {
835 f
= m
->system_servers
;
841 f
= m
->system_servers
;
847 f
= m
->fallback_servers
;
850 manager_set_server_name(m
, NULL
);
851 log_debug("No server found.");
855 if (restart
&& !m
->exhausted_servers
&& m
->poll_interval_usec
) {
856 log_debug("Waiting after exhausting servers.");
857 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
);
859 return log_error_errno(r
, "Failed to create retry timer: %m");
861 m
->exhausted_servers
= true;
863 /* Increase the polling interval */
864 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
865 m
->poll_interval_usec
*= 2;
870 m
->exhausted_servers
= false;
872 manager_set_server_name(m
, f
);
875 /* Tell the resolver to reread /etc/resolv.conf, in
876 * case it changed. */
879 /* Flush out any previously resolved addresses */
880 server_name_flush_addresses(m
->current_server_name
);
882 log_debug("Resolving %s...", m
->current_server_name
->string
);
884 r
= sd_resolve_getaddrinfo(m
->resolve
, &m
->resolve_query
, m
->current_server_name
->string
, "123", &hints
, manager_resolve_handler
, m
);
886 return log_error_errno(r
, "Failed to create resolver: %m");
891 r
= manager_begin(m
);
898 void manager_disconnect(Manager
*m
) {
901 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
903 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
905 manager_listen_stop(m
);
907 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
908 m
->clock_watch_fd
= safe_close(m
->clock_watch_fd
);
910 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
912 sd_notifyf(false, "STATUS=Idle.");
915 void manager_flush_server_names(Manager
*m
, ServerType t
) {
918 if (t
== SERVER_SYSTEM
)
919 while (m
->system_servers
)
920 server_name_free(m
->system_servers
);
922 if (t
== SERVER_LINK
)
923 while (m
->link_servers
)
924 server_name_free(m
->link_servers
);
926 if (t
== SERVER_FALLBACK
)
927 while (m
->fallback_servers
)
928 server_name_free(m
->fallback_servers
);
931 void manager_free(Manager
*m
) {
935 manager_disconnect(m
);
936 manager_flush_server_names(m
, SERVER_SYSTEM
);
937 manager_flush_server_names(m
, SERVER_LINK
);
938 manager_flush_server_names(m
, SERVER_FALLBACK
);
940 sd_event_source_unref(m
->event_retry
);
942 sd_event_source_unref(m
->network_event_source
);
943 sd_network_monitor_unref(m
->network_monitor
);
945 sd_resolve_unref(m
->resolve
);
946 sd_event_unref(m
->event
);
948 sd_bus_unref(m
->bus
);
953 static int manager_network_read_link_servers(Manager
*m
) {
954 _cleanup_strv_free_
char **ntp
= NULL
;
957 bool changed
= false;
962 r
= sd_network_get_ntp(&ntp
);
967 log_debug_errno(r
, "Failed to get link NTP servers: %m");
971 LIST_FOREACH(names
, n
, m
->link_servers
)
974 STRV_FOREACH(i
, ntp
) {
977 r
= dns_name_is_valid_or_address(*i
);
979 log_error_errno(r
, "Failed to check validity of NTP server name or address '%s': %m", *i
);
982 log_error("Invalid NTP server name or address, ignoring: %s", *i
);
986 LIST_FOREACH(names
, n
, m
->link_servers
)
987 if (streq(n
->string
, *i
)) {
994 r
= server_name_new(m
, NULL
, SERVER_LINK
, *i
);
1004 LIST_FOREACH_SAFE(names
, n
, nx
, m
->link_servers
)
1006 server_name_free(n
);
1013 manager_flush_server_names(m
, SERVER_LINK
);
1017 static bool manager_is_connected(Manager
*m
) {
1018 /* Return true when the manager is sending a request, resolving a server name, or
1019 * in a poll interval. */
1020 return m
->server_socket
>= 0 || m
->resolve_query
|| m
->event_timer
;
1023 static int manager_network_event_handler(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1024 Manager
*m
= userdata
;
1025 bool changed
, connected
, online
;
1030 sd_network_monitor_flush(m
->network_monitor
);
1032 /* When manager_network_read_link_servers() failed, we assume that the servers are changed. */
1033 changed
= !!manager_network_read_link_servers(m
);
1035 /* check if the machine is online */
1036 online
= network_is_online();
1038 /* check if the client is currently connected */
1039 connected
= manager_is_connected(m
);
1041 if (connected
&& !online
) {
1042 log_info("No network connectivity, watching for changes.");
1043 manager_disconnect(m
);
1045 } else if ((!connected
|| changed
) && online
) {
1046 log_info("Network configuration changed, trying to establish connection.");
1048 if (m
->current_server_address
)
1049 r
= manager_begin(m
);
1051 r
= manager_connect(m
);
1059 static int manager_network_monitor_listen(Manager
*m
) {
1064 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
1066 log_info("systemd does not appear to be running, not listening for systemd-networkd events.");
1072 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
1076 events
= sd_network_monitor_get_events(m
->network_monitor
);
1080 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, manager_network_event_handler
, m
);
1087 int manager_new(Manager
**ret
) {
1088 _cleanup_(manager_freep
) Manager
*m
= NULL
;
1093 m
= new0(Manager
, 1);
1097 m
->max_root_distance_usec
= NTP_MAX_ROOT_DISTANCE
;
1098 m
->poll_interval_min_usec
= NTP_POLL_INTERVAL_MIN_USEC
;
1099 m
->poll_interval_max_usec
= NTP_POLL_INTERVAL_MAX_USEC
;
1101 m
->server_socket
= m
->clock_watch_fd
= -1;
1103 RATELIMIT_INIT(m
->ratelimit
, RATELIMIT_INTERVAL_USEC
, RATELIMIT_BURST
);
1105 r
= sd_event_default(&m
->event
);
1109 sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
1110 sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
1112 sd_event_set_watchdog(m
->event
, true);
1114 r
= sd_resolve_default(&m
->resolve
);
1118 r
= sd_resolve_attach_event(m
->resolve
, m
->event
, 0);
1122 r
= manager_network_monitor_listen(m
);
1126 (void) manager_network_read_link_servers(m
);