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"
20 #include "format-util.h"
25 #include "network-util.h"
26 #include "ratelimit.h"
27 #include "resolve-private.h"
28 #include "socket-util.h"
29 #include "string-util.h"
31 #include "time-util.h"
32 #include "timesyncd-conf.h"
33 #include "timesyncd-manager.h"
37 #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */
40 /* expected accuracy of time synchronization; used to adjust the poll interval */
41 #define NTP_ACCURACY_SEC 0.2
44 * Maximum delta in seconds which the system clock is gradually adjusted
45 * (slewed) to approach the network time. Deltas larger that this are set by
46 * letting the system time jump. The kernel's limit for adjtime is 0.5s.
48 #define NTP_MAX_ADJUST 0.4
50 /* Default of maximum acceptable root distance in microseconds. */
51 #define NTP_MAX_ROOT_DISTANCE (5 * USEC_PER_SEC)
53 /* Maximum number of missed replies before selecting another source. */
54 #define NTP_MAX_MISSED_REPLIES 2
56 #define RETRY_USEC (30*USEC_PER_SEC)
57 #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC)
58 #define RATELIMIT_BURST 10
60 #define TIMEOUT_USEC (10*USEC_PER_SEC)
62 static int manager_arm_timer(Manager
*m
, usec_t next
);
63 static int manager_clock_watch_setup(Manager
*m
);
64 static int manager_listen_setup(Manager
*m
);
65 static void manager_listen_stop(Manager
*m
);
67 static double ntp_ts_short_to_d(const struct ntp_ts_short
*ts
) {
68 return be16toh(ts
->sec
) + (be16toh(ts
->frac
) / 65536.0);
71 static double ntp_ts_to_d(const struct ntp_ts
*ts
) {
72 return be32toh(ts
->sec
) + ((double)be32toh(ts
->frac
) / UINT_MAX
);
75 static double ts_to_d(const struct timespec
*ts
) {
76 return ts
->tv_sec
+ (1.0e-9 * ts
->tv_nsec
);
79 static int manager_timeout(sd_event_source
*source
, usec_t usec
, void *userdata
) {
80 _cleanup_free_
char *pretty
= NULL
;
81 Manager
*m
= userdata
;
84 assert(m
->current_server_name
);
85 assert(m
->current_server_address
);
87 server_address_pretty(m
->current_server_address
, &pretty
);
88 log_info("Timed out waiting for reply from %s (%s).", strna(pretty
), m
->current_server_name
->string
);
90 return manager_connect(m
);
93 static int manager_send_request(Manager
*m
) {
94 _cleanup_free_
char *pretty
= NULL
;
95 struct ntp_msg ntpmsg
= {
97 * "The client initializes the NTP message header, sends the request
98 * to the server, and strips the time of day from the Transmit
99 * Timestamp field of the reply. For this purpose, all the NTP
100 * header fields are set to 0, except the Mode, VN, and optional
101 * Transmit Timestamp fields."
103 .field
= NTP_FIELD(0, 4, NTP_MODE_CLIENT
),
109 assert(m
->current_server_name
);
110 assert(m
->current_server_address
);
112 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
114 r
= manager_listen_setup(m
);
116 return log_warning_errno(r
, "Failed to setup connection socket: %m");
119 * Set transmit timestamp, remember it; the server will send that back
120 * as the origin timestamp and we have an indication that this is the
121 * matching answer to our request.
123 * The actual value does not matter, We do not care about the correct
124 * NTP UINT_MAX fraction; we just pass the plain nanosecond value.
126 assert_se(clock_gettime(clock_boottime_or_monotonic(), &m
->trans_time_mon
) >= 0);
127 assert_se(clock_gettime(CLOCK_REALTIME
, &m
->trans_time
) >= 0);
128 ntpmsg
.trans_time
.sec
= htobe32(m
->trans_time
.tv_sec
+ OFFSET_1900_1970
);
129 ntpmsg
.trans_time
.frac
= htobe32(m
->trans_time
.tv_nsec
);
131 server_address_pretty(m
->current_server_address
, &pretty
);
133 len
= sendto(m
->server_socket
, &ntpmsg
, sizeof(ntpmsg
), MSG_DONTWAIT
, &m
->current_server_address
->sockaddr
.sa
, m
->current_server_address
->socklen
);
134 if (len
== sizeof(ntpmsg
)) {
136 log_debug("Sent NTP request to %s (%s).", strna(pretty
), m
->current_server_name
->string
);
138 log_debug_errno(errno
, "Sending NTP request to %s (%s) failed: %m", strna(pretty
), m
->current_server_name
->string
);
139 return manager_connect(m
);
142 /* re-arm timer with increasing timeout, in case the packets never arrive back */
143 if (m
->retry_interval
> 0) {
144 if (m
->retry_interval
< m
->poll_interval_max_usec
)
145 m
->retry_interval
*= 2;
147 m
->retry_interval
= m
->poll_interval_min_usec
;
149 r
= manager_arm_timer(m
, m
->retry_interval
);
151 return log_error_errno(r
, "Failed to rearm timer: %m");
154 if (m
->missed_replies
> NTP_MAX_MISSED_REPLIES
) {
155 r
= sd_event_add_time(
158 clock_boottime_or_monotonic(),
159 now(clock_boottime_or_monotonic()) + TIMEOUT_USEC
, 0,
162 return log_error_errno(r
, "Failed to arm timeout timer: %m");
168 static int manager_timer(sd_event_source
*source
, usec_t usec
, void *userdata
) {
169 Manager
*m
= userdata
;
173 return manager_send_request(m
);
176 static int manager_arm_timer(Manager
*m
, usec_t next
) {
182 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
186 if (m
->event_timer
) {
187 r
= sd_event_source_set_time(m
->event_timer
, now(clock_boottime_or_monotonic()) + next
);
191 return sd_event_source_set_enabled(m
->event_timer
, SD_EVENT_ONESHOT
);
194 return sd_event_add_time(
197 clock_boottime_or_monotonic(),
198 now(clock_boottime_or_monotonic()) + next
, 0,
202 static int manager_clock_watch(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
203 Manager
*m
= userdata
;
208 manager_clock_watch_setup(m
);
210 /* skip our own jumps */
217 log_debug("System time changed. Resyncing.");
218 m
->poll_resync
= true;
220 return manager_send_request(m
);
223 /* wake up when the system time changes underneath us */
224 static int manager_clock_watch_setup(Manager
*m
) {
229 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
230 safe_close(m
->clock_watch_fd
);
232 m
->clock_watch_fd
= time_change_fd();
233 if (m
->clock_watch_fd
< 0)
234 return log_error_errno(m
->clock_watch_fd
, "Failed to create timerfd: %m");
236 r
= sd_event_add_io(m
->event
, &m
->event_clock_watch
, m
->clock_watch_fd
, EPOLLIN
, manager_clock_watch
, m
);
238 return log_error_errno(r
, "Failed to create clock watch event source: %m");
243 static int manager_adjust_clock(Manager
*m
, double offset
, int leap_sec
) {
244 struct timex tmx
= {};
250 * For small deltas, tell the kernel to gradually adjust the system
251 * clock to the NTP time, larger deltas are just directly set.
253 if (fabs(offset
) < NTP_MAX_ADJUST
) {
254 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_OFFSET
| ADJ_TIMECONST
| ADJ_MAXERROR
| ADJ_ESTERROR
;
255 tmx
.status
= STA_PLL
;
256 tmx
.offset
= offset
* NSEC_PER_SEC
;
257 tmx
.constant
= log2i(m
->poll_interval_usec
/ USEC_PER_SEC
) - 4;
260 log_debug(" adjust (slew): %+.3f sec", offset
);
262 tmx
.modes
= ADJ_STATUS
| ADJ_NANO
| ADJ_SETOFFSET
| ADJ_MAXERROR
| ADJ_ESTERROR
;
264 /* ADJ_NANO uses nanoseconds in the microseconds field */
265 tmx
.time
.tv_sec
= (long)offset
;
266 tmx
.time
.tv_usec
= (offset
- tmx
.time
.tv_sec
) * NSEC_PER_SEC
;
270 /* the kernel expects -0.3s as {-1, 7000.000.000} */
271 if (tmx
.time
.tv_usec
< 0) {
272 tmx
.time
.tv_sec
-= 1;
273 tmx
.time
.tv_usec
+= NSEC_PER_SEC
;
277 log_debug(" adjust (jump): %+.3f sec", offset
);
281 * An unset STA_UNSYNC will enable the kernel's 11-minute mode,
282 * which syncs the system time periodically to the RTC.
284 * In case the RTC runs in local time, never touch the RTC,
285 * we have no way to properly handle daylight saving changes and
286 * mobile devices moving between time zones.
288 if (m
->rtc_local_time
)
289 tmx
.status
|= STA_UNSYNC
;
293 tmx
.status
|= STA_INS
;
296 tmx
.status
|= STA_DEL
;
300 r
= clock_adjtime(CLOCK_REALTIME
, &tmx
);
304 /* If touch fails, there isn't much we can do. Maybe it'll work next time. */
305 (void) touch("/var/lib/systemd/timesync/clock");
306 (void) touch("/run/systemd/timesync/synchronized");
308 m
->drift_freq
= tmx
.freq
;
310 log_debug(" status : %04i %s\n"
311 " time now : %"PRI_TIME
".%03"PRI_USEC
"\n"
312 " constant : %"PRI_TIMEX
"\n"
313 " offset : %+.3f sec\n"
314 " freq offset : %+"PRI_TIMEX
" (%+"PRI_TIMEX
" ppm)\n",
315 tmx
.status
, tmx
.status
& STA_UNSYNC
? "unsync" : "sync",
316 tmx
.time
.tv_sec
, tmx
.time
.tv_usec
/ NSEC_PER_MSEC
,
318 (double)tmx
.offset
/ NSEC_PER_SEC
,
319 tmx
.freq
, tmx
.freq
/ 65536);
324 static bool manager_sample_spike_detection(Manager
*m
, double offset
, double delay
) {
325 unsigned i
, idx_cur
, idx_new
, idx_min
;
333 /* ignore initial sample */
334 if (m
->packet_count
== 1)
337 /* store the current data in our samples array */
338 idx_cur
= m
->samples_idx
;
339 idx_new
= (idx_cur
+ 1) % ELEMENTSOF(m
->samples
);
340 m
->samples_idx
= idx_new
;
341 m
->samples
[idx_new
].offset
= offset
;
342 m
->samples
[idx_new
].delay
= delay
;
344 /* calculate new jitter value from the RMS differences relative to the lowest delay sample */
345 jitter
= m
->samples_jitter
;
346 for (idx_min
= idx_cur
, i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
347 if (m
->samples
[i
].delay
> 0 && m
->samples
[i
].delay
< m
->samples
[idx_min
].delay
)
351 for (i
= 0; i
< ELEMENTSOF(m
->samples
); i
++)
352 j
+= pow(m
->samples
[i
].offset
- m
->samples
[idx_min
].offset
, 2);
353 m
->samples_jitter
= sqrt(j
/ (ELEMENTSOF(m
->samples
) - 1));
355 /* ignore samples when resyncing */
359 /* always accept offset if we are farther off than the round-trip delay */
360 if (fabs(offset
) > delay
)
363 /* we need a few samples before looking at them */
364 if (m
->packet_count
< 4)
367 /* do not accept anything worse than the maximum possible error of the best sample */
368 if (fabs(offset
) > m
->samples
[idx_min
].delay
)
371 /* compare the difference between the current offset to the previous offset and jitter */
372 return fabs(offset
- m
->samples
[idx_cur
].offset
) > 3 * jitter
;
375 static void manager_adjust_poll(Manager
*m
, double offset
, bool spike
) {
378 if (m
->poll_resync
) {
379 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
380 m
->poll_resync
= false;
384 /* set to minimal poll interval */
385 if (!spike
&& fabs(offset
) > NTP_ACCURACY_SEC
) {
386 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
390 /* increase polling interval */
391 if (fabs(offset
) < NTP_ACCURACY_SEC
* 0.25) {
392 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
393 m
->poll_interval_usec
*= 2;
397 /* decrease polling interval */
398 if (spike
|| fabs(offset
) > NTP_ACCURACY_SEC
* 0.75) {
399 if (m
->poll_interval_usec
> m
->poll_interval_min_usec
)
400 m
->poll_interval_usec
/= 2;
405 static int manager_receive_response(sd_event_source
*source
, int fd
, uint32_t revents
, void *userdata
) {
406 Manager
*m
= userdata
;
407 struct ntp_msg ntpmsg
;
411 .iov_len
= sizeof(ntpmsg
),
414 struct cmsghdr cmsghdr
;
415 uint8_t buf
[CMSG_SPACE(sizeof(struct timeval
))];
417 union sockaddr_union server_addr
;
418 struct msghdr msghdr
= {
421 .msg_control
= &control
,
422 .msg_controllen
= sizeof(control
),
423 .msg_name
= &server_addr
,
424 .msg_namelen
= sizeof(server_addr
),
426 struct cmsghdr
*cmsg
;
427 struct timespec
*recv_time
= NULL
;
429 double origin
, receive
, trans
, dest
;
430 double delay
, offset
;
431 double root_distance
;
439 if (revents
& (EPOLLHUP
|EPOLLERR
)) {
440 log_warning("Server connection returned error.");
441 return manager_connect(m
);
444 len
= recvmsg(fd
, &msghdr
, MSG_DONTWAIT
);
449 log_warning("Error receiving message. Disconnecting.");
450 return manager_connect(m
);
453 /* Too short or too long packet? */
454 if (iov
.iov_len
< sizeof(struct ntp_msg
) || (msghdr
.msg_flags
& MSG_TRUNC
)) {
455 log_warning("Invalid response from server. Disconnecting.");
456 return manager_connect(m
);
459 if (!m
->current_server_name
||
460 !m
->current_server_address
||
461 !sockaddr_equal(&server_addr
, &m
->current_server_address
->sockaddr
)) {
462 log_debug("Response from unknown server.");
466 CMSG_FOREACH(cmsg
, &msghdr
) {
467 if (cmsg
->cmsg_level
!= SOL_SOCKET
)
470 switch (cmsg
->cmsg_type
) {
471 case SCM_TIMESTAMPNS
:
472 recv_time
= (struct timespec
*) CMSG_DATA(cmsg
);
477 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
478 "Invalid packet timestamp.");
481 log_debug("Unexpected reply. Ignoring.");
485 m
->missed_replies
= 0;
487 /* check our "time cookie" (we just stored nanoseconds in the fraction field) */
488 if (be32toh(ntpmsg
.origin_time
.sec
) != m
->trans_time
.tv_sec
+ OFFSET_1900_1970
||
489 be32toh(ntpmsg
.origin_time
.frac
) != (unsigned long) m
->trans_time
.tv_nsec
) {
490 log_debug("Invalid reply; not our transmit time. Ignoring.");
494 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
496 if (be32toh(ntpmsg
.recv_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
||
497 be32toh(ntpmsg
.trans_time
.sec
) < TIME_EPOCH
+ OFFSET_1900_1970
) {
498 log_debug("Invalid reply, returned times before epoch. Ignoring.");
499 return manager_connect(m
);
502 if (NTP_FIELD_LEAP(ntpmsg
.field
) == NTP_LEAP_NOTINSYNC
||
503 ntpmsg
.stratum
== 0 || ntpmsg
.stratum
>= 16) {
504 log_debug("Server is not synchronized. Disconnecting.");
505 return manager_connect(m
);
508 if (!IN_SET(NTP_FIELD_VERSION(ntpmsg
.field
), 3, 4)) {
509 log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg
.field
));
510 return manager_connect(m
);
513 if (NTP_FIELD_MODE(ntpmsg
.field
) != NTP_MODE_SERVER
) {
514 log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg
.field
));
515 return manager_connect(m
);
518 root_distance
= ntp_ts_short_to_d(&ntpmsg
.root_delay
) / 2 + ntp_ts_short_to_d(&ntpmsg
.root_dispersion
);
519 if (root_distance
> (double) m
->max_root_distance_usec
/ (double) USEC_PER_SEC
) {
520 log_debug("Server has too large root distance. Disconnecting.");
521 return manager_connect(m
);
526 m
->retry_interval
= 0;
529 manager_listen_stop(m
);
531 /* announce leap seconds */
532 if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_PLUSSEC
)
534 else if (NTP_FIELD_LEAP(ntpmsg
.field
) & NTP_LEAP_MINUSSEC
)
540 * "Timestamp Name ID When Generated
541 * ------------------------------------------------------------
542 * Originate Timestamp T1 time request sent by client
543 * Receive Timestamp T2 time request received by server
544 * Transmit Timestamp T3 time reply sent by server
545 * Destination Timestamp T4 time reply received by client
547 * The round-trip delay, d, and system clock offset, t, are defined as:
548 * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2"
550 origin
= ts_to_d(&m
->trans_time
) + OFFSET_1900_1970
;
551 receive
= ntp_ts_to_d(&ntpmsg
.recv_time
);
552 trans
= ntp_ts_to_d(&ntpmsg
.trans_time
);
553 dest
= ts_to_d(recv_time
) + OFFSET_1900_1970
;
555 offset
= ((receive
- origin
) + (trans
- dest
)) / 2;
556 delay
= (dest
- origin
) - (trans
- receive
);
558 spike
= manager_sample_spike_detection(m
, offset
, delay
);
560 manager_adjust_poll(m
, offset
, spike
);
562 log_debug("NTP response:\n"
567 " precision : %.6f sec (%d)\n"
568 " root distance: %.6f sec\n"
569 " reference : %.4s\n"
574 " offset : %+.3f sec\n"
575 " delay : %+.3f sec\n"
576 " packet count : %"PRIu64
"\n"
578 " poll interval: " USEC_FMT
"\n",
579 NTP_FIELD_LEAP(ntpmsg
.field
),
580 NTP_FIELD_VERSION(ntpmsg
.field
),
581 NTP_FIELD_MODE(ntpmsg
.field
),
583 exp2(ntpmsg
.precision
), ntpmsg
.precision
,
585 ntpmsg
.stratum
== 1 ? ntpmsg
.refid
: "n/a",
586 origin
- OFFSET_1900_1970
,
587 receive
- OFFSET_1900_1970
,
588 trans
- OFFSET_1900_1970
,
589 dest
- OFFSET_1900_1970
,
592 m
->samples_jitter
, spike
? " spike" : "",
593 m
->poll_interval_usec
/ USEC_PER_SEC
);
597 r
= manager_adjust_clock(m
, offset
, leap_sec
);
599 log_error_errno(r
, "Failed to call clock_adjtime(): %m");
602 /* Save NTP response */
604 m
->origin_time
= m
->trans_time
;
605 m
->dest_time
= *recv_time
;
608 log_debug("interval/delta/delay/jitter/drift " USEC_FMT
"s/%+.3fs/%.3fs/%.3fs/%+"PRIi64
"ppm%s",
609 m
->poll_interval_usec
/ USEC_PER_SEC
, offset
, delay
, m
->samples_jitter
, m
->drift_freq
/ 65536,
610 spike
? " (ignored)" : "");
612 (void) sd_bus_emit_properties_changed(m
->bus
, "/org/freedesktop/timesync1", "org.freedesktop.timesync1.Manager", "NTPMessage", NULL
);
615 _cleanup_free_
char *pretty
= NULL
;
619 server_address_pretty(m
->current_server_address
, &pretty
);
620 /* "Initial", as further successful syncs will not be logged. */
621 log_info("Initial synchronization to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
622 sd_notifyf(false, "STATUS=Initial synchronization to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
625 r
= manager_arm_timer(m
, m
->poll_interval_usec
);
627 return log_error_errno(r
, "Failed to rearm timer: %m");
632 static int manager_listen_setup(Manager
*m
) {
633 union sockaddr_union addr
= {};
638 if (m
->server_socket
>= 0)
641 assert(!m
->event_receive
);
642 assert(m
->current_server_address
);
644 addr
.sa
.sa_family
= m
->current_server_address
->sockaddr
.sa
.sa_family
;
646 m
->server_socket
= socket(addr
.sa
.sa_family
, SOCK_DGRAM
| SOCK_CLOEXEC
, 0);
647 if (m
->server_socket
< 0)
650 r
= bind(m
->server_socket
, &addr
.sa
, m
->current_server_address
->socklen
);
654 r
= setsockopt_int(m
->server_socket
, SOL_SOCKET
, SO_TIMESTAMPNS
, true);
658 (void) setsockopt_int(m
->server_socket
, IPPROTO_IP
, IP_TOS
, IPTOS_LOWDELAY
);
660 return sd_event_add_io(m
->event
, &m
->event_receive
, m
->server_socket
, EPOLLIN
, manager_receive_response
, m
);
663 static void manager_listen_stop(Manager
*m
) {
666 m
->event_receive
= sd_event_source_unref(m
->event_receive
);
667 m
->server_socket
= safe_close(m
->server_socket
);
670 static int manager_begin(Manager
*m
) {
671 _cleanup_free_
char *pretty
= NULL
;
675 assert_return(m
->current_server_name
, -EHOSTUNREACH
);
676 assert_return(m
->current_server_address
, -EHOSTUNREACH
);
679 m
->missed_replies
= NTP_MAX_MISSED_REPLIES
;
680 if (m
->poll_interval_usec
== 0)
681 m
->poll_interval_usec
= m
->poll_interval_min_usec
;
683 server_address_pretty(m
->current_server_address
, &pretty
);
684 log_debug("Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
685 sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty
), m
->current_server_name
->string
);
687 r
= manager_clock_watch_setup(m
);
691 return manager_send_request(m
);
694 void manager_set_server_name(Manager
*m
, ServerName
*n
) {
697 if (m
->current_server_name
== n
)
700 m
->current_server_name
= n
;
701 m
->current_server_address
= NULL
;
703 manager_disconnect(m
);
706 log_debug("Selected server %s.", n
->string
);
709 void manager_set_server_address(Manager
*m
, ServerAddress
*a
) {
712 if (m
->current_server_address
== a
)
715 m
->current_server_address
= a
;
716 /* If a is NULL, we are just clearing the address, without
717 * changing the name. Keep the existing name in that case. */
719 m
->current_server_name
= a
->name
;
721 manager_disconnect(m
);
724 _cleanup_free_
char *pretty
= NULL
;
725 server_address_pretty(a
, &pretty
);
726 log_debug("Selected address %s of server %s.", strna(pretty
), a
->name
->string
);
730 static int manager_resolve_handler(sd_resolve_query
*q
, int ret
, const struct addrinfo
*ai
, Manager
*m
) {
735 assert(m
->current_server_name
);
737 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
740 log_debug("Failed to resolve %s: %s", m
->current_server_name
->string
, gai_strerror(ret
));
743 return manager_connect(m
);
746 for (; ai
; ai
= ai
->ai_next
) {
747 _cleanup_free_
char *pretty
= NULL
;
751 assert(ai
->ai_addrlen
>= offsetof(struct sockaddr
, sa_data
));
753 if (!IN_SET(ai
->ai_addr
->sa_family
, AF_INET
, AF_INET6
)) {
754 log_warning("Unsuitable address protocol for %s", m
->current_server_name
->string
);
758 r
= server_address_new(m
->current_server_name
, &a
, (const union sockaddr_union
*) ai
->ai_addr
, ai
->ai_addrlen
);
760 return log_error_errno(r
, "Failed to add server address: %m");
762 server_address_pretty(a
, &pretty
);
763 log_debug("Resolved address %s for %s.", pretty
, m
->current_server_name
->string
);
766 if (!m
->current_server_name
->addresses
) {
767 log_error("Failed to find suitable address for host %s.", m
->current_server_name
->string
);
770 return manager_connect(m
);
773 manager_set_server_address(m
, m
->current_server_name
->addresses
);
775 return manager_begin(m
);
778 static int manager_retry_connect(sd_event_source
*source
, usec_t usec
, void *userdata
) {
779 Manager
*m
= userdata
;
783 return manager_connect(m
);
786 int manager_connect(Manager
*m
) {
791 manager_disconnect(m
);
793 m
->event_retry
= sd_event_source_unref(m
->event_retry
);
794 if (!ratelimit_below(&m
->ratelimit
)) {
795 log_debug("Delaying attempts to contact servers.");
797 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
);
799 return log_error_errno(r
, "Failed to create retry timer: %m");
804 /* If we already are operating on some address, switch to the
806 if (m
->current_server_address
&& m
->current_server_address
->addresses_next
)
807 manager_set_server_address(m
, m
->current_server_address
->addresses_next
);
809 struct addrinfo hints
= {
810 .ai_flags
= AI_NUMERICSERV
|AI_ADDRCONFIG
,
811 .ai_socktype
= SOCK_DGRAM
,
814 /* Hmm, we are through all addresses, let's look for the next host instead */
815 if (m
->current_server_name
&& m
->current_server_name
->names_next
)
816 manager_set_server_name(m
, m
->current_server_name
->names_next
);
821 /* Our current server name list is exhausted,
822 * let's find the next one to iterate. First
823 * we try the system list, then the link list.
824 * After having processed the link list we
825 * jump back to the system list. However, if
826 * both lists are empty, we change to the
828 if (!m
->current_server_name
|| m
->current_server_name
->type
== SERVER_LINK
) {
829 f
= m
->system_servers
;
835 f
= m
->system_servers
;
841 f
= m
->fallback_servers
;
844 manager_set_server_name(m
, NULL
);
845 log_debug("No server found.");
849 if (restart
&& !m
->exhausted_servers
&& m
->poll_interval_usec
) {
850 log_debug("Waiting after exhausting servers.");
851 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
);
853 return log_error_errno(r
, "Failed to create retry timer: %m");
855 m
->exhausted_servers
= true;
857 /* Increase the polling interval */
858 if (m
->poll_interval_usec
< m
->poll_interval_max_usec
)
859 m
->poll_interval_usec
*= 2;
864 m
->exhausted_servers
= false;
866 manager_set_server_name(m
, f
);
869 /* Tell the resolver to reread /etc/resolv.conf, in
870 * case it changed. */
873 /* Flush out any previously resolved addresses */
874 server_name_flush_addresses(m
->current_server_name
);
876 log_debug("Resolving %s...", m
->current_server_name
->string
);
878 r
= resolve_getaddrinfo(m
->resolve
, &m
->resolve_query
, m
->current_server_name
->string
, "123", &hints
, manager_resolve_handler
, NULL
, m
);
880 return log_error_errno(r
, "Failed to create resolver: %m");
885 r
= manager_begin(m
);
892 void manager_disconnect(Manager
*m
) {
895 m
->resolve_query
= sd_resolve_query_unref(m
->resolve_query
);
897 m
->event_timer
= sd_event_source_unref(m
->event_timer
);
899 manager_listen_stop(m
);
901 m
->event_clock_watch
= sd_event_source_unref(m
->event_clock_watch
);
902 m
->clock_watch_fd
= safe_close(m
->clock_watch_fd
);
904 m
->event_timeout
= sd_event_source_unref(m
->event_timeout
);
906 sd_notifyf(false, "STATUS=Idle.");
909 void manager_flush_server_names(Manager
*m
, ServerType t
) {
912 if (t
== SERVER_SYSTEM
)
913 while (m
->system_servers
)
914 server_name_free(m
->system_servers
);
916 if (t
== SERVER_LINK
)
917 while (m
->link_servers
)
918 server_name_free(m
->link_servers
);
920 if (t
== SERVER_FALLBACK
)
921 while (m
->fallback_servers
)
922 server_name_free(m
->fallback_servers
);
925 void manager_free(Manager
*m
) {
929 manager_disconnect(m
);
930 manager_flush_server_names(m
, SERVER_SYSTEM
);
931 manager_flush_server_names(m
, SERVER_LINK
);
932 manager_flush_server_names(m
, SERVER_FALLBACK
);
934 sd_event_source_unref(m
->event_retry
);
936 sd_event_source_unref(m
->network_event_source
);
937 sd_network_monitor_unref(m
->network_monitor
);
939 sd_resolve_unref(m
->resolve
);
940 sd_event_unref(m
->event
);
942 sd_bus_flush_close_unref(m
->bus
);
947 static int manager_network_read_link_servers(Manager
*m
) {
948 _cleanup_strv_free_
char **ntp
= NULL
;
951 bool changed
= false;
956 r
= sd_network_get_ntp(&ntp
);
961 log_debug_errno(r
, "Failed to get link NTP servers: %m");
965 LIST_FOREACH(names
, n
, m
->link_servers
)
968 STRV_FOREACH(i
, ntp
) {
971 r
= dns_name_is_valid_or_address(*i
);
973 log_error_errno(r
, "Failed to check validity of NTP server name or address '%s': %m", *i
);
976 log_error("Invalid NTP server name or address, ignoring: %s", *i
);
980 LIST_FOREACH(names
, n
, m
->link_servers
)
981 if (streq(n
->string
, *i
)) {
988 r
= server_name_new(m
, NULL
, SERVER_LINK
, *i
);
998 LIST_FOREACH_SAFE(names
, n
, nx
, m
->link_servers
)
1000 server_name_free(n
);
1007 manager_flush_server_names(m
, SERVER_LINK
);
1011 static bool manager_is_connected(Manager
*m
) {
1012 /* Return true when the manager is sending a request, resolving a server name, or
1013 * in a poll interval. */
1014 return m
->server_socket
>= 0 || m
->resolve_query
|| m
->event_timer
;
1017 static int manager_network_event_handler(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1018 Manager
*m
= userdata
;
1019 bool changed
, connected
, online
;
1024 sd_network_monitor_flush(m
->network_monitor
);
1026 /* When manager_network_read_link_servers() failed, we assume that the servers are changed. */
1027 changed
= manager_network_read_link_servers(m
);
1029 /* check if the machine is online */
1030 online
= network_is_online();
1032 /* check if the client is currently connected */
1033 connected
= manager_is_connected(m
);
1035 if (connected
&& !online
) {
1036 log_info("No network connectivity, watching for changes.");
1037 manager_disconnect(m
);
1039 } else if ((!connected
|| changed
) && online
) {
1040 log_info("Network configuration changed, trying to establish connection.");
1042 if (m
->current_server_address
)
1043 r
= manager_begin(m
);
1045 r
= manager_connect(m
);
1053 static int manager_network_monitor_listen(Manager
*m
) {
1058 r
= sd_network_monitor_new(&m
->network_monitor
, NULL
);
1060 log_info("systemd does not appear to be running, not listening for systemd-networkd events.");
1066 fd
= sd_network_monitor_get_fd(m
->network_monitor
);
1070 events
= sd_network_monitor_get_events(m
->network_monitor
);
1074 r
= sd_event_add_io(m
->event
, &m
->network_event_source
, fd
, events
, manager_network_event_handler
, m
);
1081 int manager_new(Manager
**ret
) {
1082 _cleanup_(manager_freep
) Manager
*m
= NULL
;
1087 m
= new0(Manager
, 1);
1091 m
->max_root_distance_usec
= NTP_MAX_ROOT_DISTANCE
;
1092 m
->poll_interval_min_usec
= NTP_POLL_INTERVAL_MIN_USEC
;
1093 m
->poll_interval_max_usec
= NTP_POLL_INTERVAL_MAX_USEC
;
1095 m
->server_socket
= m
->clock_watch_fd
= -1;
1097 m
->ratelimit
= (RateLimit
) { RATELIMIT_INTERVAL_USEC
, RATELIMIT_BURST
};
1099 r
= sd_event_default(&m
->event
);
1103 (void) sd_event_add_signal(m
->event
, NULL
, SIGTERM
, NULL
, NULL
);
1104 (void) sd_event_add_signal(m
->event
, NULL
, SIGINT
, NULL
, NULL
);
1106 (void) sd_event_set_watchdog(m
->event
, true);
1108 r
= sd_resolve_default(&m
->resolve
);
1112 r
= sd_resolve_attach_event(m
->resolve
, m
->event
, 0);
1116 r
= manager_network_monitor_listen(m
);
1120 (void) manager_network_read_link_servers(m
);