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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
84e51726 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2014 Kay Sievers, Lennart Poettering | |
84e51726 LP |
6 | ***/ |
7 | ||
84e51726 | 8 | #include <errno.h> |
84e51726 | 9 | #include <math.h> |
84e51726 LP |
10 | #include <netinet/in.h> |
11 | #include <netinet/ip.h> | |
07630cea LP |
12 | #include <resolv.h> |
13 | #include <stdlib.h> | |
14 | #include <sys/socket.h> | |
84e51726 LP |
15 | #include <sys/timerfd.h> |
16 | #include <sys/timex.h> | |
84e51726 | 17 | #include <sys/types.h> |
07630cea LP |
18 | #include <time.h> |
19 | ||
20 | #include "sd-daemon.h" | |
84e51726 | 21 | |
b5efdb8a | 22 | #include "alloc-util.h" |
dcb37458 | 23 | #include "dns-domain.h" |
3ffd4af2 | 24 | #include "fd-util.h" |
f4f15635 | 25 | #include "fs-util.h" |
84e51726 | 26 | #include "list.h" |
07630cea LP |
27 | #include "log.h" |
28 | #include "missing.h" | |
29 | #include "network-util.h" | |
84e51726 | 30 | #include "ratelimit.h" |
07630cea | 31 | #include "socket-util.h" |
07630cea | 32 | #include "string-util.h" |
84e51726 | 33 | #include "strv.h" |
07630cea | 34 | #include "time-util.h" |
84e51726 LP |
35 | #include "timesyncd-conf.h" |
36 | #include "timesyncd-manager.h" | |
3ffd4af2 | 37 | #include "util.h" |
84e51726 LP |
38 | |
39 | #ifndef ADJ_SETOFFSET | |
40 | #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */ | |
41 | #endif | |
42 | ||
43 | /* expected accuracy of time synchronization; used to adjust the poll interval */ | |
44 | #define NTP_ACCURACY_SEC 0.2 | |
45 | ||
84e51726 LP |
46 | /* |
47 | * Maximum delta in seconds which the system clock is gradually adjusted | |
a4465d0d | 48 | * (slewed) to approach the network time. Deltas larger that this are set by |
84e51726 LP |
49 | * letting the system time jump. The kernel's limit for adjtime is 0.5s. |
50 | */ | |
51 | #define NTP_MAX_ADJUST 0.4 | |
52 | ||
a4465d0d | 53 | /* Default of maximum acceptable root distance in microseconds. */ |
f907cc16 | 54 | #define NTP_MAX_ROOT_DISTANCE (5 * USEC_PER_SEC) |
3af0442c | 55 | |
e8206972 ML |
56 | /* Maximum number of missed replies before selecting another source. */ |
57 | #define NTP_MAX_MISSED_REPLIES 2 | |
58 | ||
84e51726 LP |
59 | #define RETRY_USEC (30*USEC_PER_SEC) |
60 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) | |
61 | #define RATELIMIT_BURST 10 | |
62 | ||
63 | #define TIMEOUT_USEC (10*USEC_PER_SEC) | |
64 | ||
84e51726 LP |
65 | static int manager_arm_timer(Manager *m, usec_t next); |
66 | static int manager_clock_watch_setup(Manager *m); | |
7b628891 | 67 | static int manager_listen_setup(Manager *m); |
f89c4e15 | 68 | static void manager_listen_stop(Manager *m); |
84e51726 | 69 | |
3af0442c ML |
70 | static double ntp_ts_short_to_d(const struct ntp_ts_short *ts) { |
71 | return be16toh(ts->sec) + (be16toh(ts->frac) / 65536.0); | |
72 | } | |
73 | ||
84e51726 LP |
74 | static double ntp_ts_to_d(const struct ntp_ts *ts) { |
75 | return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX); | |
76 | } | |
77 | ||
78 | static double ts_to_d(const struct timespec *ts) { | |
79 | return ts->tv_sec + (1.0e-9 * ts->tv_nsec); | |
80 | } | |
81 | ||
84e51726 LP |
82 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { |
83 | _cleanup_free_ char *pretty = NULL; | |
84 | Manager *m = userdata; | |
85 | ||
86 | assert(m); | |
87 | assert(m->current_server_name); | |
88 | assert(m->current_server_address); | |
89 | ||
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); | |
92 | ||
93 | return manager_connect(m); | |
94 | } | |
95 | ||
96 | static int manager_send_request(Manager *m) { | |
97 | _cleanup_free_ char *pretty = NULL; | |
98 | struct ntp_msg ntpmsg = { | |
99 | /* | |
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." | |
105 | */ | |
106 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
107 | }; | |
108 | ssize_t len; | |
109 | int r; | |
110 | ||
111 | assert(m); | |
112 | assert(m->current_server_name); | |
113 | assert(m->current_server_address); | |
114 | ||
115 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
116 | ||
f89c4e15 LP |
117 | r = manager_listen_setup(m); |
118 | if (r < 0) | |
119 | return log_warning_errno(r, "Failed to setup connection socket: %m"); | |
7b628891 | 120 | |
84e51726 LP |
121 | /* |
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. | |
125 | * | |
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. | |
128 | */ | |
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); | |
133 | ||
134 | server_address_pretty(m->current_server_address, &pretty); | |
135 | ||
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)) { | |
138 | m->pending = true; | |
139 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); | |
140 | } else { | |
56f64d95 | 141 | log_debug_errno(errno, "Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); |
84e51726 LP |
142 | return manager_connect(m); |
143 | } | |
144 | ||
ab4df227 KS |
145 | /* re-arm timer with increasing timeout, in case the packets never arrive back */ |
146 | if (m->retry_interval > 0) { | |
a4465d0d | 147 | if (m->retry_interval < m->poll_interval_max_usec) |
ab4df227 KS |
148 | m->retry_interval *= 2; |
149 | } else | |
a4465d0d | 150 | m->retry_interval = m->poll_interval_min_usec; |
ab4df227 KS |
151 | |
152 | r = manager_arm_timer(m, m->retry_interval); | |
f647962d MS |
153 | if (r < 0) |
154 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
ab4df227 | 155 | |
e8206972 ML |
156 | m->missed_replies++; |
157 | if (m->missed_replies > NTP_MAX_MISSED_REPLIES) { | |
158 | r = sd_event_add_time( | |
159 | m->event, | |
160 | &m->event_timeout, | |
161 | clock_boottime_or_monotonic(), | |
162 | now(clock_boottime_or_monotonic()) + TIMEOUT_USEC, 0, | |
163 | manager_timeout, m); | |
f647962d MS |
164 | if (r < 0) |
165 | return log_error_errno(r, "Failed to arm timeout timer: %m"); | |
84e51726 LP |
166 | } |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
172 | Manager *m = userdata; | |
173 | ||
174 | assert(m); | |
175 | ||
176 | return manager_send_request(m); | |
177 | } | |
178 | ||
179 | static int manager_arm_timer(Manager *m, usec_t next) { | |
180 | int r; | |
181 | ||
182 | assert(m); | |
84e51726 LP |
183 | |
184 | if (next == 0) { | |
185 | m->event_timer = sd_event_source_unref(m->event_timer); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | if (m->event_timer) { | |
190 | r = sd_event_source_set_time(m->event_timer, now(clock_boottime_or_monotonic()) + next); | |
191 | if (r < 0) | |
192 | return r; | |
193 | ||
194 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); | |
195 | } | |
196 | ||
197 | return sd_event_add_time( | |
198 | m->event, | |
199 | &m->event_timer, | |
200 | clock_boottime_or_monotonic(), | |
201 | now(clock_boottime_or_monotonic()) + next, 0, | |
202 | manager_timer, m); | |
203 | } | |
204 | ||
205 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
206 | Manager *m = userdata; | |
207 | ||
208 | assert(m); | |
209 | ||
210 | /* rearm timer */ | |
211 | manager_clock_watch_setup(m); | |
212 | ||
213 | /* skip our own jumps */ | |
214 | if (m->jumped) { | |
215 | m->jumped = false; | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* resync */ | |
7e3254b3 | 220 | log_debug("System time changed. Resyncing."); |
84e51726 LP |
221 | m->poll_resync = true; |
222 | ||
223 | return manager_send_request(m); | |
224 | } | |
225 | ||
226 | /* wake up when the system time changes underneath us */ | |
227 | static int manager_clock_watch_setup(Manager *m) { | |
84e51726 LP |
228 | int r; |
229 | ||
230 | assert(m); | |
231 | ||
232 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
233 | safe_close(m->clock_watch_fd); | |
234 | ||
4f811d27 | 235 | m->clock_watch_fd = time_change_fd(); |
4a62c710 | 236 | if (m->clock_watch_fd < 0) |
4f811d27 | 237 | return log_error_errno(m->clock_watch_fd, "Failed to create timerfd: %m"); |
84e51726 LP |
238 | |
239 | r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m); | |
f647962d MS |
240 | if (r < 0) |
241 | return log_error_errno(r, "Failed to create clock watch event source: %m"); | |
84e51726 LP |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { | |
247 | struct timex tmx = {}; | |
248 | int r; | |
249 | ||
250 | assert(m); | |
251 | ||
252 | /* | |
253 | * For small deltas, tell the kernel to gradually adjust the system | |
254 | * clock to the NTP time, larger deltas are just directly set. | |
255 | */ | |
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; | |
261 | tmx.maxerror = 0; | |
262 | tmx.esterror = 0; | |
ff49bc32 | 263 | log_debug(" adjust (slew): %+.3f sec", offset); |
84e51726 | 264 | } else { |
5f36e3d3 | 265 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_SETOFFSET | ADJ_MAXERROR | ADJ_ESTERROR; |
84e51726 LP |
266 | |
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; | |
5f36e3d3 AK |
270 | tmx.maxerror = 0; |
271 | tmx.esterror = 0; | |
84e51726 LP |
272 | |
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; | |
277 | } | |
278 | ||
279 | m->jumped = true; | |
ff49bc32 | 280 | log_debug(" adjust (jump): %+.3f sec", offset); |
84e51726 LP |
281 | } |
282 | ||
283 | /* | |
284 | * An unset STA_UNSYNC will enable the kernel's 11-minute mode, | |
285 | * which syncs the system time periodically to the RTC. | |
286 | * | |
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. | |
290 | */ | |
291 | if (m->rtc_local_time) | |
292 | tmx.status |= STA_UNSYNC; | |
293 | ||
294 | switch (leap_sec) { | |
295 | case 1: | |
296 | tmx.status |= STA_INS; | |
297 | break; | |
298 | case -1: | |
299 | tmx.status |= STA_DEL; | |
300 | break; | |
301 | } | |
302 | ||
303 | r = clock_adjtime(CLOCK_REALTIME, &tmx); | |
304 | if (r < 0) | |
6ff6f4d8 | 305 | return -errno; |
84e51726 | 306 | |
baa33e79 | 307 | /* If touch fails, there isn't much we can do. Maybe it'll work next time. */ |
53d133ea | 308 | (void) touch("/var/lib/systemd/timesync/clock"); |
2dd79846 | 309 | (void) touch("/run/systemd/timesync/synchronized"); |
84e51726 | 310 | |
66086a40 | 311 | m->drift_freq = tmx.freq; |
84e51726 LP |
312 | |
313 | log_debug(" status : %04i %s\n" | |
0060bb8f | 314 | " time now : %"PRI_TIME".%03"PRI_USEC"\n" |
3bd7ef83 | 315 | " constant : %"PRI_TIMEX"\n" |
84e51726 | 316 | " offset : %+.3f sec\n" |
66086a40 | 317 | " freq offset : %+"PRI_TIMEX" (%+"PRI_TIMEX" ppm)\n", |
84e51726 | 318 | tmx.status, tmx.status & STA_UNSYNC ? "unsync" : "sync", |
70887c5f | 319 | tmx.time.tv_sec, tmx.time.tv_usec / NSEC_PER_MSEC, |
84e51726 LP |
320 | tmx.constant, |
321 | (double)tmx.offset / NSEC_PER_SEC, | |
66086a40 | 322 | tmx.freq, tmx.freq / 65536); |
84e51726 LP |
323 | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { | |
328 | unsigned int i, idx_cur, idx_new, idx_min; | |
329 | double jitter; | |
330 | double j; | |
331 | ||
332 | assert(m); | |
333 | ||
334 | m->packet_count++; | |
335 | ||
336 | /* ignore initial sample */ | |
337 | if (m->packet_count == 1) | |
338 | return false; | |
339 | ||
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; | |
346 | ||
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) | |
351 | idx_min = i; | |
352 | ||
353 | j = 0; | |
354 | for (i = 0; i < ELEMENTSOF(m->samples); i++) | |
fa66b606 | 355 | j += pow(m->samples[i].offset - m->samples[idx_min].offset, 2); |
84e51726 LP |
356 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); |
357 | ||
358 | /* ignore samples when resyncing */ | |
359 | if (m->poll_resync) | |
360 | return false; | |
361 | ||
362 | /* always accept offset if we are farther off than the round-trip delay */ | |
363 | if (fabs(offset) > delay) | |
364 | return false; | |
365 | ||
366 | /* we need a few samples before looking at them */ | |
367 | if (m->packet_count < 4) | |
368 | return false; | |
369 | ||
370 | /* do not accept anything worse than the maximum possible error of the best sample */ | |
371 | if (fabs(offset) > m->samples[idx_min].delay) | |
372 | return true; | |
373 | ||
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; | |
376 | } | |
377 | ||
378 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { | |
379 | assert(m); | |
380 | ||
381 | if (m->poll_resync) { | |
a4465d0d | 382 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
383 | m->poll_resync = false; |
384 | return; | |
385 | } | |
386 | ||
387 | /* set to minimal poll interval */ | |
388 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { | |
a4465d0d | 389 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
390 | return; |
391 | } | |
392 | ||
393 | /* increase polling interval */ | |
394 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { | |
a4465d0d | 395 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
84e51726 LP |
396 | m->poll_interval_usec *= 2; |
397 | return; | |
398 | } | |
399 | ||
400 | /* decrease polling interval */ | |
401 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { | |
a4465d0d | 402 | if (m->poll_interval_usec > m->poll_interval_min_usec) |
84e51726 LP |
403 | m->poll_interval_usec /= 2; |
404 | return; | |
405 | } | |
406 | } | |
407 | ||
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; | |
411 | ||
412 | struct iovec iov = { | |
413 | .iov_base = &ntpmsg, | |
414 | .iov_len = sizeof(ntpmsg), | |
415 | }; | |
416 | union { | |
417 | struct cmsghdr cmsghdr; | |
418 | uint8_t buf[CMSG_SPACE(sizeof(struct timeval))]; | |
419 | } control; | |
420 | union sockaddr_union server_addr; | |
421 | struct msghdr msghdr = { | |
422 | .msg_iov = &iov, | |
423 | .msg_iovlen = 1, | |
424 | .msg_control = &control, | |
425 | .msg_controllen = sizeof(control), | |
426 | .msg_name = &server_addr, | |
427 | .msg_namelen = sizeof(server_addr), | |
428 | }; | |
429 | struct cmsghdr *cmsg; | |
1cc6c93a | 430 | struct timespec *recv_time = NULL; |
84e51726 LP |
431 | ssize_t len; |
432 | double origin, receive, trans, dest; | |
433 | double delay, offset; | |
3af0442c | 434 | double root_distance; |
84e51726 LP |
435 | bool spike; |
436 | int leap_sec; | |
437 | int r; | |
438 | ||
439 | assert(source); | |
440 | assert(m); | |
441 | ||
442 | if (revents & (EPOLLHUP|EPOLLERR)) { | |
443 | log_warning("Server connection returned error."); | |
444 | return manager_connect(m); | |
445 | } | |
446 | ||
a38d9945 | 447 | len = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
84e51726 LP |
448 | if (len < 0) { |
449 | if (errno == EAGAIN) | |
450 | return 0; | |
451 | ||
452 | log_warning("Error receiving message. Disconnecting."); | |
453 | return manager_connect(m); | |
454 | } | |
455 | ||
43fcd650 TM |
456 | /* Too short or too long packet? */ |
457 | if (iov.iov_len < sizeof(struct ntp_msg) || (msghdr.msg_flags & MSG_TRUNC)) { | |
84e51726 LP |
458 | log_warning("Invalid response from server. Disconnecting."); |
459 | return manager_connect(m); | |
460 | } | |
461 | ||
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."); | |
466 | return 0; | |
467 | } | |
468 | ||
2a1288ff | 469 | CMSG_FOREACH(cmsg, &msghdr) { |
84e51726 LP |
470 | if (cmsg->cmsg_level != SOL_SOCKET) |
471 | continue; | |
472 | ||
473 | switch (cmsg->cmsg_type) { | |
487a3682 ML |
474 | case SCM_TIMESTAMPNS: |
475 | recv_time = (struct timespec *) CMSG_DATA(cmsg); | |
84e51726 LP |
476 | break; |
477 | } | |
478 | } | |
479 | if (!recv_time) { | |
480 | log_error("Invalid packet timestamp."); | |
481 | return -EINVAL; | |
482 | } | |
483 | ||
484 | if (!m->pending) { | |
485 | log_debug("Unexpected reply. Ignoring."); | |
486 | return 0; | |
487 | } | |
488 | ||
e8206972 ML |
489 | m->missed_replies = 0; |
490 | ||
84e51726 LP |
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 || | |
edd50d5e | 493 | be32toh(ntpmsg.origin_time.frac) != (unsigned long) m->trans_time.tv_nsec) { |
84e51726 LP |
494 | log_debug("Invalid reply; not our transmit time. Ignoring."); |
495 | return 0; | |
496 | } | |
497 | ||
498 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
499 | ||
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); | |
504 | } | |
505 | ||
07610e10 ML |
506 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC || |
507 | ntpmsg.stratum == 0 || ntpmsg.stratum >= 16) { | |
84e51726 LP |
508 | log_debug("Server is not synchronized. Disconnecting."); |
509 | return manager_connect(m); | |
510 | } | |
511 | ||
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); | |
515 | } | |
516 | ||
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); | |
520 | } | |
521 | ||
3af0442c | 522 | root_distance = ntp_ts_short_to_d(&ntpmsg.root_delay) / 2 + ntp_ts_short_to_d(&ntpmsg.root_dispersion); |
f907cc16 | 523 | if (root_distance > (double) m->max_root_distance_usec / (double) USEC_PER_SEC) { |
3af0442c ML |
524 | log_debug("Server has too large root distance. Disconnecting."); |
525 | return manager_connect(m); | |
526 | } | |
527 | ||
84e51726 LP |
528 | /* valid packet */ |
529 | m->pending = false; | |
ab4df227 | 530 | m->retry_interval = 0; |
84e51726 | 531 | |
7b628891 | 532 | /* Stop listening */ |
f89c4e15 | 533 | manager_listen_stop(m); |
7b628891 | 534 | |
84e51726 LP |
535 | /* announce leap seconds */ |
536 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) | |
537 | leap_sec = 1; | |
538 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) | |
539 | leap_sec = -1; | |
540 | else | |
541 | leap_sec = 0; | |
542 | ||
543 | /* | |
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 | |
550 | * | |
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" | |
553 | */ | |
73c76e63 | 554 | origin = ts_to_d(&m->trans_time) + OFFSET_1900_1970; |
84e51726 LP |
555 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
556 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
487a3682 | 557 | dest = ts_to_d(recv_time) + OFFSET_1900_1970; |
84e51726 LP |
558 | |
559 | offset = ((receive - origin) + (trans - dest)) / 2; | |
560 | delay = (dest - origin) - (trans - receive); | |
561 | ||
562 | spike = manager_sample_spike_detection(m, offset, delay); | |
563 | ||
564 | manager_adjust_poll(m, offset, spike); | |
565 | ||
566 | log_debug("NTP response:\n" | |
567 | " leap : %u\n" | |
568 | " version : %u\n" | |
569 | " mode : %u\n" | |
570 | " stratum : %u\n" | |
571 | " precision : %.6f sec (%d)\n" | |
3af0442c | 572 | " root distance: %.6f sec\n" |
84e51726 LP |
573 | " reference : %.4s\n" |
574 | " origin : %.3f\n" | |
575 | " receive : %.3f\n" | |
576 | " transmit : %.3f\n" | |
577 | " dest : %.3f\n" | |
578 | " offset : %+.3f sec\n" | |
579 | " delay : %+.3f sec\n" | |
580 | " packet count : %"PRIu64"\n" | |
581 | " jitter : %.3f%s\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), | |
586 | ntpmsg.stratum, | |
587 | exp2(ntpmsg.precision), ntpmsg.precision, | |
3af0442c | 588 | root_distance, |
84e51726 LP |
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, | |
594 | offset, delay, | |
595 | m->packet_count, | |
596 | m->samples_jitter, spike ? " spike" : "", | |
597 | m->poll_interval_usec / USEC_PER_SEC); | |
598 | ||
599 | if (!spike) { | |
600 | m->sync = true; | |
601 | r = manager_adjust_clock(m, offset, leap_sec); | |
602 | if (r < 0) | |
6ff6f4d8 | 603 | log_error_errno(r, "Failed to call clock_adjtime(): %m"); |
84e51726 LP |
604 | } |
605 | ||
66086a40 YW |
606 | /* Save NTP response */ |
607 | m->ntpmsg = ntpmsg; | |
608 | m->origin_time = m->trans_time; | |
609 | m->dest_time = *recv_time; | |
610 | m->spike = spike; | |
611 | ||
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, | |
7b5b3fc3 | 614 | spike ? " (ignored)" : ""); |
84e51726 | 615 | |
66086a40 YW |
616 | (void) sd_bus_emit_properties_changed(m->bus, "/org/freedesktop/timesync1", "org.freedesktop.timesync1.Manager", "NTPMessage", NULL); |
617 | ||
481b3f9e LP |
618 | if (!m->good) { |
619 | _cleanup_free_ char *pretty = NULL; | |
620 | ||
621 | m->good = true; | |
622 | ||
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); | |
626 | } | |
627 | ||
84e51726 | 628 | r = manager_arm_timer(m, m->poll_interval_usec); |
f647962d MS |
629 | if (r < 0) |
630 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
84e51726 LP |
631 | |
632 | return 0; | |
633 | } | |
634 | ||
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; | |
639 | int r; | |
640 | ||
641 | assert(m); | |
642 | ||
f89c4e15 LP |
643 | if (m->server_socket >= 0) |
644 | return 0; | |
645 | ||
84e51726 LP |
646 | assert(!m->event_receive); |
647 | assert(m->current_server_address); | |
648 | ||
649 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; | |
650 | ||
651 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); | |
652 | if (m->server_socket < 0) | |
653 | return -errno; | |
654 | ||
655 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); | |
656 | if (r < 0) | |
657 | return -errno; | |
658 | ||
487a3682 | 659 | r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, &on, sizeof(on)); |
84e51726 LP |
660 | if (r < 0) |
661 | return -errno; | |
662 | ||
69f00817 | 663 | (void) setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
84e51726 LP |
664 | |
665 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); | |
666 | } | |
667 | ||
f89c4e15 LP |
668 | static void manager_listen_stop(Manager *m) { |
669 | assert(m); | |
670 | ||
671 | m->event_receive = sd_event_source_unref(m->event_receive); | |
672 | m->server_socket = safe_close(m->server_socket); | |
673 | } | |
674 | ||
84e51726 LP |
675 | static int manager_begin(Manager *m) { |
676 | _cleanup_free_ char *pretty = NULL; | |
677 | int r; | |
678 | ||
679 | assert(m); | |
680 | assert_return(m->current_server_name, -EHOSTUNREACH); | |
681 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
682 | ||
481b3f9e | 683 | m->good = false; |
e8206972 | 684 | m->missed_replies = NTP_MAX_MISSED_REPLIES; |
80cd2606 | 685 | if (m->poll_interval_usec == 0) |
a4465d0d | 686 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
687 | |
688 | server_address_pretty(m->current_server_address, &pretty); | |
481b3f9e LP |
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); | |
84e51726 | 691 | |
84e51726 LP |
692 | r = manager_clock_watch_setup(m); |
693 | if (r < 0) | |
694 | return r; | |
695 | ||
696 | return manager_send_request(m); | |
697 | } | |
698 | ||
874ff7bf LP |
699 | void manager_set_server_name(Manager *m, ServerName *n) { |
700 | assert(m); | |
84e51726 | 701 | |
874ff7bf LP |
702 | if (m->current_server_name == n) |
703 | return; | |
84e51726 | 704 | |
874ff7bf LP |
705 | m->current_server_name = n; |
706 | m->current_server_address = NULL; | |
707 | ||
708 | manager_disconnect(m); | |
84e51726 | 709 | |
874ff7bf LP |
710 | if (n) |
711 | log_debug("Selected server %s.", n->string); | |
712 | } | |
84e51726 | 713 | |
874ff7bf | 714 | void manager_set_server_address(Manager *m, ServerAddress *a) { |
84e51726 LP |
715 | assert(m); |
716 | ||
874ff7bf LP |
717 | if (m->current_server_address == a) |
718 | return; | |
719 | ||
874ff7bf | 720 | m->current_server_address = a; |
20f8d3cf SN |
721 | /* If a is NULL, we are just clearing the address, without |
722 | * changing the name. Keep the existing name in that case. */ | |
723 | if (a) | |
724 | m->current_server_name = a->name; | |
874ff7bf LP |
725 | |
726 | manager_disconnect(m); | |
727 | ||
728 | if (a) { | |
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); | |
84e51726 LP |
732 | } |
733 | } | |
734 | ||
735 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { | |
736 | Manager *m = userdata; | |
874ff7bf | 737 | int r; |
84e51726 LP |
738 | |
739 | assert(q); | |
740 | assert(m); | |
741 | assert(m->current_server_name); | |
742 | ||
743 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
744 | ||
745 | if (ret != 0) { | |
746 | log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); | |
747 | ||
748 | /* Try next host */ | |
749 | return manager_connect(m); | |
750 | } | |
751 | ||
84e51726 LP |
752 | for (; ai; ai = ai->ai_next) { |
753 | _cleanup_free_ char *pretty = NULL; | |
874ff7bf | 754 | ServerAddress *a; |
84e51726 LP |
755 | |
756 | assert(ai->ai_addr); | |
757 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
84e51726 LP |
758 | |
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); | |
761 | continue; | |
762 | } | |
763 | ||
874ff7bf | 764 | r = server_address_new(m->current_server_name, &a, (const union sockaddr_union*) ai->ai_addr, ai->ai_addrlen); |
f647962d MS |
765 | if (r < 0) |
766 | return log_error_errno(r, "Failed to add server address: %m"); | |
84e51726 | 767 | |
874ff7bf | 768 | server_address_pretty(a, &pretty); |
84e51726 LP |
769 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
770 | } | |
771 | ||
772 | if (!m->current_server_name->addresses) { | |
773 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
774 | ||
775 | /* Try next host */ | |
776 | return manager_connect(m); | |
777 | } | |
778 | ||
874ff7bf | 779 | manager_set_server_address(m, m->current_server_name->addresses); |
84e51726 LP |
780 | |
781 | return manager_begin(m); | |
782 | } | |
783 | ||
874ff7bf | 784 | static int manager_retry_connect(sd_event_source *source, usec_t usec, void *userdata) { |
84e51726 LP |
785 | Manager *m = userdata; |
786 | ||
787 | assert(m); | |
788 | ||
789 | return manager_connect(m); | |
790 | } | |
791 | ||
792 | int manager_connect(Manager *m) { | |
84e51726 LP |
793 | int r; |
794 | ||
795 | assert(m); | |
796 | ||
797 | manager_disconnect(m); | |
798 | ||
799 | m->event_retry = sd_event_source_unref(m->event_retry); | |
7994ac1d | 800 | if (!ratelimit_below(&m->ratelimit)) { |
84e51726 LP |
801 | log_debug("Slowing down attempts to contact servers."); |
802 | ||
874ff7bf | 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); |
f647962d MS |
804 | if (r < 0) |
805 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
84e51726 LP |
806 | |
807 | return 0; | |
808 | } | |
809 | ||
810 | /* If we already are operating on some address, switch to the | |
811 | * next one. */ | |
812 | if (m->current_server_address && m->current_server_address->addresses_next) | |
874ff7bf | 813 | manager_set_server_address(m, m->current_server_address->addresses_next); |
84e51726 | 814 | else { |
874ff7bf LP |
815 | struct addrinfo hints = { |
816 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, | |
817 | .ai_socktype = SOCK_DGRAM, | |
818 | }; | |
84e51726 | 819 | |
874ff7bf | 820 | /* Hmm, we are through all addresses, let's look for the next host instead */ |
84e51726 | 821 | if (m->current_server_name && m->current_server_name->names_next) |
874ff7bf | 822 | manager_set_server_name(m, m->current_server_name->names_next); |
84e51726 | 823 | else { |
874ff7bf | 824 | ServerName *f; |
63463bf0 | 825 | bool restart = true; |
874ff7bf LP |
826 | |
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 | |
833 | * fallback list. */ | |
834 | if (!m->current_server_name || m->current_server_name->type == SERVER_LINK) { | |
835 | f = m->system_servers; | |
836 | if (!f) | |
837 | f = m->link_servers; | |
838 | } else { | |
839 | f = m->link_servers; | |
840 | if (!f) | |
841 | f = m->system_servers; | |
63463bf0 ML |
842 | else |
843 | restart = false; | |
874ff7bf LP |
844 | } |
845 | ||
846 | if (!f) | |
847 | f = m->fallback_servers; | |
848 | ||
849 | if (!f) { | |
850 | manager_set_server_name(m, NULL); | |
84e51726 LP |
851 | log_debug("No server found."); |
852 | return 0; | |
853 | } | |
854 | ||
63463bf0 ML |
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); | |
f647962d MS |
858 | if (r < 0) |
859 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
63463bf0 ML |
860 | |
861 | m->exhausted_servers = true; | |
862 | ||
863 | /* Increase the polling interval */ | |
a4465d0d | 864 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
63463bf0 ML |
865 | m->poll_interval_usec *= 2; |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | m->exhausted_servers = false; | |
871 | ||
874ff7bf | 872 | manager_set_server_name(m, f); |
84e51726 LP |
873 | } |
874 | ||
875 | /* Tell the resolver to reread /etc/resolv.conf, in | |
876 | * case it changed. */ | |
877 | res_init(); | |
878 | ||
874ff7bf LP |
879 | /* Flush out any previously resolved addresses */ |
880 | server_name_flush_addresses(m->current_server_name); | |
881 | ||
882 | log_debug("Resolving %s...", m->current_server_name->string); | |
883 | ||
84e51726 | 884 | r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m); |
f647962d MS |
885 | if (r < 0) |
886 | return log_error_errno(r, "Failed to create resolver: %m"); | |
84e51726 LP |
887 | |
888 | return 1; | |
889 | } | |
890 | ||
891 | r = manager_begin(m); | |
892 | if (r < 0) | |
893 | return r; | |
894 | ||
895 | return 1; | |
896 | } | |
897 | ||
84e51726 LP |
898 | void manager_disconnect(Manager *m) { |
899 | assert(m); | |
900 | ||
901 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
902 | ||
903 | m->event_timer = sd_event_source_unref(m->event_timer); | |
904 | ||
f89c4e15 | 905 | manager_listen_stop(m); |
84e51726 LP |
906 | |
907 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
908 | m->clock_watch_fd = safe_close(m->clock_watch_fd); | |
909 | ||
910 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
911 | ||
912 | sd_notifyf(false, "STATUS=Idle."); | |
913 | } | |
914 | ||
874ff7bf LP |
915 | void manager_flush_server_names(Manager *m, ServerType t) { |
916 | assert(m); | |
917 | ||
918 | if (t == SERVER_SYSTEM) | |
919 | while (m->system_servers) | |
920 | server_name_free(m->system_servers); | |
921 | ||
922 | if (t == SERVER_LINK) | |
923 | while (m->link_servers) | |
924 | server_name_free(m->link_servers); | |
925 | ||
926 | if (t == SERVER_FALLBACK) | |
927 | while (m->fallback_servers) | |
928 | server_name_free(m->fallback_servers); | |
929 | } | |
84e51726 LP |
930 | |
931 | void manager_free(Manager *m) { | |
932 | if (!m) | |
933 | return; | |
934 | ||
935 | manager_disconnect(m); | |
874ff7bf LP |
936 | manager_flush_server_names(m, SERVER_SYSTEM); |
937 | manager_flush_server_names(m, SERVER_LINK); | |
938 | manager_flush_server_names(m, SERVER_FALLBACK); | |
84e51726 LP |
939 | |
940 | sd_event_source_unref(m->event_retry); | |
941 | ||
942 | sd_event_source_unref(m->network_event_source); | |
943 | sd_network_monitor_unref(m->network_monitor); | |
944 | ||
945 | sd_resolve_unref(m->resolve); | |
946 | sd_event_unref(m->event); | |
947 | ||
e7dd3947 YW |
948 | sd_bus_unref(m->bus); |
949 | ||
84e51726 LP |
950 | free(m); |
951 | } | |
952 | ||
874ff7bf LP |
953 | static int manager_network_read_link_servers(Manager *m) { |
954 | _cleanup_strv_free_ char **ntp = NULL; | |
955 | ServerName *n, *nx; | |
956 | char **i; | |
3e85ec07 | 957 | bool changed = false; |
874ff7bf LP |
958 | int r; |
959 | ||
84e51726 LP |
960 | assert(m); |
961 | ||
874ff7bf | 962 | r = sd_network_get_ntp(&ntp); |
ba0c011e YW |
963 | if (r < 0) { |
964 | if (r == -ENOMEM) | |
965 | log_oom(); | |
966 | else | |
967 | log_debug_errno(r, "Failed to get link NTP servers: %m"); | |
874ff7bf | 968 | goto clear; |
ba0c011e | 969 | } |
874ff7bf LP |
970 | |
971 | LIST_FOREACH(names, n, m->link_servers) | |
972 | n->marked = true; | |
973 | ||
974 | STRV_FOREACH(i, ntp) { | |
975 | bool found = false; | |
976 | ||
dcb37458 YW |
977 | r = dns_name_is_valid_or_address(*i); |
978 | if (r < 0) { | |
979 | log_error_errno(r, "Failed to check validity of NTP server name or address '%s': %m", *i); | |
980 | goto clear; | |
981 | } else if (r == 0) { | |
982 | log_error("Invalid NTP server name or address, ignoring: %s", *i); | |
983 | continue; | |
984 | } | |
985 | ||
874ff7bf LP |
986 | LIST_FOREACH(names, n, m->link_servers) |
987 | if (streq(n->string, *i)) { | |
988 | n->marked = false; | |
989 | found = true; | |
990 | break; | |
991 | } | |
992 | ||
993 | if (!found) { | |
994 | r = server_name_new(m, NULL, SERVER_LINK, *i); | |
ba0c011e YW |
995 | if (r < 0) { |
996 | log_oom(); | |
874ff7bf | 997 | goto clear; |
ba0c011e | 998 | } |
3e85ec07 YW |
999 | |
1000 | changed = true; | |
874ff7bf LP |
1001 | } |
1002 | } | |
1003 | ||
1004 | LIST_FOREACH_SAFE(names, n, nx, m->link_servers) | |
3e85ec07 | 1005 | if (n->marked) { |
874ff7bf | 1006 | server_name_free(n); |
3e85ec07 YW |
1007 | changed = true; |
1008 | } | |
874ff7bf | 1009 | |
3e85ec07 | 1010 | return changed; |
874ff7bf LP |
1011 | |
1012 | clear: | |
1013 | manager_flush_server_names(m, SERVER_LINK); | |
1014 | return r; | |
84e51726 LP |
1015 | } |
1016 | ||
0630eb1b YW |
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; | |
1021 | } | |
1022 | ||
84e51726 LP |
1023 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
1024 | Manager *m = userdata; | |
3e85ec07 | 1025 | bool changed, connected, online; |
84e51726 LP |
1026 | int r; |
1027 | ||
1028 | assert(m); | |
1029 | ||
1030 | sd_network_monitor_flush(m->network_monitor); | |
1031 | ||
ba0c011e | 1032 | /* When manager_network_read_link_servers() failed, we assume that the servers are changed. */ |
3e85ec07 | 1033 | changed = !!manager_network_read_link_servers(m); |
874ff7bf | 1034 | |
84e51726 LP |
1035 | /* check if the machine is online */ |
1036 | online = network_is_online(); | |
1037 | ||
1038 | /* check if the client is currently connected */ | |
0630eb1b | 1039 | connected = manager_is_connected(m); |
84e51726 LP |
1040 | |
1041 | if (connected && !online) { | |
1042 | log_info("No network connectivity, watching for changes."); | |
1043 | manager_disconnect(m); | |
1044 | ||
0630eb1b | 1045 | } else if ((!connected || changed) && online) { |
84e51726 LP |
1046 | log_info("Network configuration changed, trying to establish connection."); |
1047 | ||
1048 | if (m->current_server_address) | |
1049 | r = manager_begin(m); | |
1050 | else | |
1051 | r = manager_connect(m); | |
1052 | if (r < 0) | |
1053 | return r; | |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | static int manager_network_monitor_listen(Manager *m) { | |
1060 | int r, fd, events; | |
1061 | ||
1062 | assert(m); | |
1063 | ||
1064 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
36484c03 | 1065 | if (r == -ENOENT) { |
f95b0be7 | 1066 | log_info("systemd does not appear to be running, not listening for systemd-networkd events."); |
36484c03 ZJS |
1067 | return 0; |
1068 | } | |
84e51726 LP |
1069 | if (r < 0) |
1070 | return r; | |
1071 | ||
1072 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
1073 | if (fd < 0) | |
1074 | return fd; | |
1075 | ||
1076 | events = sd_network_monitor_get_events(m->network_monitor); | |
1077 | if (events < 0) | |
1078 | return events; | |
1079 | ||
1080 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, manager_network_event_handler, m); | |
1081 | if (r < 0) | |
1082 | return r; | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | int manager_new(Manager **ret) { | |
1088 | _cleanup_(manager_freep) Manager *m = NULL; | |
1089 | int r; | |
1090 | ||
1091 | assert(ret); | |
1092 | ||
1093 | m = new0(Manager, 1); | |
1094 | if (!m) | |
1095 | return -ENOMEM; | |
1096 | ||
f907cc16 | 1097 | m->max_root_distance_usec = NTP_MAX_ROOT_DISTANCE; |
a4465d0d YW |
1098 | m->poll_interval_min_usec = NTP_POLL_INTERVAL_MIN_USEC; |
1099 | m->poll_interval_max_usec = NTP_POLL_INTERVAL_MAX_USEC; | |
f907cc16 | 1100 | |
84e51726 LP |
1101 | m->server_socket = m->clock_watch_fd = -1; |
1102 | ||
1103 | RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST); | |
1104 | ||
84e51726 LP |
1105 | r = sd_event_default(&m->event); |
1106 | if (r < 0) | |
1107 | return r; | |
1108 | ||
1109 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
1110 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
1111 | ||
1112 | sd_event_set_watchdog(m->event, true); | |
1113 | ||
1114 | r = sd_resolve_default(&m->resolve); | |
1115 | if (r < 0) | |
1116 | return r; | |
1117 | ||
1118 | r = sd_resolve_attach_event(m->resolve, m->event, 0); | |
1119 | if (r < 0) | |
1120 | return r; | |
1121 | ||
1122 | r = manager_network_monitor_listen(m); | |
1123 | if (r < 0) | |
1124 | return r; | |
1125 | ||
ba0c011e | 1126 | (void) manager_network_read_link_servers(m); |
874ff7bf | 1127 | |
1cc6c93a | 1128 | *ret = TAKE_PTR(m); |
84e51726 LP |
1129 | |
1130 | return 0; | |
1131 | } |