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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" |
3ffd4af2 | 23 | #include "fd-util.h" |
f4f15635 | 24 | #include "fs-util.h" |
84e51726 | 25 | #include "list.h" |
07630cea LP |
26 | #include "log.h" |
27 | #include "missing.h" | |
28 | #include "network-util.h" | |
84e51726 | 29 | #include "ratelimit.h" |
07630cea LP |
30 | #include "socket-util.h" |
31 | #include "sparse-endian.h" | |
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 | ||
53 | /* NTP protocol, packet header */ | |
54 | #define NTP_LEAP_PLUSSEC 1 | |
55 | #define NTP_LEAP_MINUSSEC 2 | |
56 | #define NTP_LEAP_NOTINSYNC 3 | |
57 | #define NTP_MODE_CLIENT 3 | |
58 | #define NTP_MODE_SERVER 4 | |
59 | #define NTP_FIELD_LEAP(f) (((f) >> 6) & 3) | |
60 | #define NTP_FIELD_VERSION(f) (((f) >> 3) & 7) | |
61 | #define NTP_FIELD_MODE(f) ((f) & 7) | |
62 | #define NTP_FIELD(l, v, m) (((l) << 6) | ((v) << 3) | (m)) | |
63 | ||
a4465d0d | 64 | /* Default of maximum acceptable root distance in microseconds. */ |
f907cc16 | 65 | #define NTP_MAX_ROOT_DISTANCE (5 * USEC_PER_SEC) |
3af0442c | 66 | |
e8206972 ML |
67 | /* Maximum number of missed replies before selecting another source. */ |
68 | #define NTP_MAX_MISSED_REPLIES 2 | |
69 | ||
84e51726 LP |
70 | /* |
71 | * "NTP timestamps are represented as a 64-bit unsigned fixed-point number, | |
72 | * in seconds relative to 0h on 1 January 1900." | |
73 | */ | |
625b3b71 | 74 | #define OFFSET_1900_1970 UINT64_C(2208988800) |
84e51726 LP |
75 | |
76 | #define RETRY_USEC (30*USEC_PER_SEC) | |
77 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) | |
78 | #define RATELIMIT_BURST 10 | |
79 | ||
80 | #define TIMEOUT_USEC (10*USEC_PER_SEC) | |
81 | ||
82 | struct ntp_ts { | |
83 | be32_t sec; | |
84 | be32_t frac; | |
85 | } _packed_; | |
86 | ||
87 | struct ntp_ts_short { | |
88 | be16_t sec; | |
89 | be16_t frac; | |
90 | } _packed_; | |
91 | ||
92 | struct ntp_msg { | |
93 | uint8_t field; | |
94 | uint8_t stratum; | |
95 | int8_t poll; | |
96 | int8_t precision; | |
97 | struct ntp_ts_short root_delay; | |
98 | struct ntp_ts_short root_dispersion; | |
99 | char refid[4]; | |
100 | struct ntp_ts reference_time; | |
101 | struct ntp_ts origin_time; | |
102 | struct ntp_ts recv_time; | |
103 | struct ntp_ts trans_time; | |
104 | } _packed_; | |
105 | ||
106 | static int manager_arm_timer(Manager *m, usec_t next); | |
107 | static int manager_clock_watch_setup(Manager *m); | |
7b628891 | 108 | static int manager_listen_setup(Manager *m); |
f89c4e15 | 109 | static void manager_listen_stop(Manager *m); |
84e51726 | 110 | |
3af0442c ML |
111 | static double ntp_ts_short_to_d(const struct ntp_ts_short *ts) { |
112 | return be16toh(ts->sec) + (be16toh(ts->frac) / 65536.0); | |
113 | } | |
114 | ||
84e51726 LP |
115 | static double ntp_ts_to_d(const struct ntp_ts *ts) { |
116 | return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX); | |
117 | } | |
118 | ||
119 | static double ts_to_d(const struct timespec *ts) { | |
120 | return ts->tv_sec + (1.0e-9 * ts->tv_nsec); | |
121 | } | |
122 | ||
84e51726 LP |
123 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { |
124 | _cleanup_free_ char *pretty = NULL; | |
125 | Manager *m = userdata; | |
126 | ||
127 | assert(m); | |
128 | assert(m->current_server_name); | |
129 | assert(m->current_server_address); | |
130 | ||
131 | server_address_pretty(m->current_server_address, &pretty); | |
132 | log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string); | |
133 | ||
134 | return manager_connect(m); | |
135 | } | |
136 | ||
137 | static int manager_send_request(Manager *m) { | |
138 | _cleanup_free_ char *pretty = NULL; | |
139 | struct ntp_msg ntpmsg = { | |
140 | /* | |
141 | * "The client initializes the NTP message header, sends the request | |
142 | * to the server, and strips the time of day from the Transmit | |
143 | * Timestamp field of the reply. For this purpose, all the NTP | |
144 | * header fields are set to 0, except the Mode, VN, and optional | |
145 | * Transmit Timestamp fields." | |
146 | */ | |
147 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
148 | }; | |
149 | ssize_t len; | |
150 | int r; | |
151 | ||
152 | assert(m); | |
153 | assert(m->current_server_name); | |
154 | assert(m->current_server_address); | |
155 | ||
156 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
157 | ||
f89c4e15 LP |
158 | r = manager_listen_setup(m); |
159 | if (r < 0) | |
160 | return log_warning_errno(r, "Failed to setup connection socket: %m"); | |
7b628891 | 161 | |
84e51726 LP |
162 | /* |
163 | * Set transmit timestamp, remember it; the server will send that back | |
164 | * as the origin timestamp and we have an indication that this is the | |
165 | * matching answer to our request. | |
166 | * | |
167 | * The actual value does not matter, We do not care about the correct | |
168 | * NTP UINT_MAX fraction; we just pass the plain nanosecond value. | |
169 | */ | |
170 | assert_se(clock_gettime(clock_boottime_or_monotonic(), &m->trans_time_mon) >= 0); | |
171 | assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0); | |
172 | ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970); | |
173 | ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec); | |
174 | ||
175 | server_address_pretty(m->current_server_address, &pretty); | |
176 | ||
177 | len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen); | |
178 | if (len == sizeof(ntpmsg)) { | |
179 | m->pending = true; | |
180 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); | |
181 | } else { | |
56f64d95 | 182 | log_debug_errno(errno, "Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); |
84e51726 LP |
183 | return manager_connect(m); |
184 | } | |
185 | ||
ab4df227 KS |
186 | /* re-arm timer with increasing timeout, in case the packets never arrive back */ |
187 | if (m->retry_interval > 0) { | |
a4465d0d | 188 | if (m->retry_interval < m->poll_interval_max_usec) |
ab4df227 KS |
189 | m->retry_interval *= 2; |
190 | } else | |
a4465d0d | 191 | m->retry_interval = m->poll_interval_min_usec; |
ab4df227 KS |
192 | |
193 | r = manager_arm_timer(m, m->retry_interval); | |
f647962d MS |
194 | if (r < 0) |
195 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
ab4df227 | 196 | |
e8206972 ML |
197 | m->missed_replies++; |
198 | if (m->missed_replies > NTP_MAX_MISSED_REPLIES) { | |
199 | r = sd_event_add_time( | |
200 | m->event, | |
201 | &m->event_timeout, | |
202 | clock_boottime_or_monotonic(), | |
203 | now(clock_boottime_or_monotonic()) + TIMEOUT_USEC, 0, | |
204 | manager_timeout, m); | |
f647962d MS |
205 | if (r < 0) |
206 | return log_error_errno(r, "Failed to arm timeout timer: %m"); | |
84e51726 LP |
207 | } |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
213 | Manager *m = userdata; | |
214 | ||
215 | assert(m); | |
216 | ||
217 | return manager_send_request(m); | |
218 | } | |
219 | ||
220 | static int manager_arm_timer(Manager *m, usec_t next) { | |
221 | int r; | |
222 | ||
223 | assert(m); | |
84e51726 LP |
224 | |
225 | if (next == 0) { | |
226 | m->event_timer = sd_event_source_unref(m->event_timer); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | if (m->event_timer) { | |
231 | r = sd_event_source_set_time(m->event_timer, now(clock_boottime_or_monotonic()) + next); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); | |
236 | } | |
237 | ||
238 | return sd_event_add_time( | |
239 | m->event, | |
240 | &m->event_timer, | |
241 | clock_boottime_or_monotonic(), | |
242 | now(clock_boottime_or_monotonic()) + next, 0, | |
243 | manager_timer, m); | |
244 | } | |
245 | ||
246 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
247 | Manager *m = userdata; | |
248 | ||
249 | assert(m); | |
250 | ||
251 | /* rearm timer */ | |
252 | manager_clock_watch_setup(m); | |
253 | ||
254 | /* skip our own jumps */ | |
255 | if (m->jumped) { | |
256 | m->jumped = false; | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* resync */ | |
7e3254b3 | 261 | log_debug("System time changed. Resyncing."); |
84e51726 LP |
262 | m->poll_resync = true; |
263 | ||
264 | return manager_send_request(m); | |
265 | } | |
266 | ||
267 | /* wake up when the system time changes underneath us */ | |
268 | static int manager_clock_watch_setup(Manager *m) { | |
269 | ||
270 | struct itimerspec its = { | |
271 | .it_value.tv_sec = TIME_T_MAX | |
272 | }; | |
273 | ||
274 | int r; | |
275 | ||
276 | assert(m); | |
277 | ||
278 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
279 | safe_close(m->clock_watch_fd); | |
280 | ||
281 | m->clock_watch_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC); | |
4a62c710 MS |
282 | if (m->clock_watch_fd < 0) |
283 | return log_error_errno(errno, "Failed to create timerfd: %m"); | |
84e51726 | 284 | |
4a62c710 MS |
285 | if (timerfd_settime(m->clock_watch_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) |
286 | return log_error_errno(errno, "Failed to set up timerfd: %m"); | |
84e51726 LP |
287 | |
288 | r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m); | |
f647962d MS |
289 | if (r < 0) |
290 | return log_error_errno(r, "Failed to create clock watch event source: %m"); | |
84e51726 LP |
291 | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { | |
296 | struct timex tmx = {}; | |
297 | int r; | |
298 | ||
299 | assert(m); | |
300 | ||
301 | /* | |
302 | * For small deltas, tell the kernel to gradually adjust the system | |
303 | * clock to the NTP time, larger deltas are just directly set. | |
304 | */ | |
305 | if (fabs(offset) < NTP_MAX_ADJUST) { | |
306 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR; | |
307 | tmx.status = STA_PLL; | |
308 | tmx.offset = offset * NSEC_PER_SEC; | |
309 | tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4; | |
310 | tmx.maxerror = 0; | |
311 | tmx.esterror = 0; | |
ff49bc32 | 312 | log_debug(" adjust (slew): %+.3f sec", offset); |
84e51726 | 313 | } else { |
5f36e3d3 | 314 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_SETOFFSET | ADJ_MAXERROR | ADJ_ESTERROR; |
84e51726 LP |
315 | |
316 | /* ADJ_NANO uses nanoseconds in the microseconds field */ | |
317 | tmx.time.tv_sec = (long)offset; | |
318 | tmx.time.tv_usec = (offset - tmx.time.tv_sec) * NSEC_PER_SEC; | |
5f36e3d3 AK |
319 | tmx.maxerror = 0; |
320 | tmx.esterror = 0; | |
84e51726 LP |
321 | |
322 | /* the kernel expects -0.3s as {-1, 7000.000.000} */ | |
323 | if (tmx.time.tv_usec < 0) { | |
324 | tmx.time.tv_sec -= 1; | |
325 | tmx.time.tv_usec += NSEC_PER_SEC; | |
326 | } | |
327 | ||
328 | m->jumped = true; | |
ff49bc32 | 329 | log_debug(" adjust (jump): %+.3f sec", offset); |
84e51726 LP |
330 | } |
331 | ||
332 | /* | |
333 | * An unset STA_UNSYNC will enable the kernel's 11-minute mode, | |
334 | * which syncs the system time periodically to the RTC. | |
335 | * | |
336 | * In case the RTC runs in local time, never touch the RTC, | |
337 | * we have no way to properly handle daylight saving changes and | |
338 | * mobile devices moving between time zones. | |
339 | */ | |
340 | if (m->rtc_local_time) | |
341 | tmx.status |= STA_UNSYNC; | |
342 | ||
343 | switch (leap_sec) { | |
344 | case 1: | |
345 | tmx.status |= STA_INS; | |
346 | break; | |
347 | case -1: | |
348 | tmx.status |= STA_DEL; | |
349 | break; | |
350 | } | |
351 | ||
352 | r = clock_adjtime(CLOCK_REALTIME, &tmx); | |
353 | if (r < 0) | |
6ff6f4d8 | 354 | return -errno; |
84e51726 | 355 | |
baa33e79 | 356 | /* If touch fails, there isn't much we can do. Maybe it'll work next time. */ |
53d133ea | 357 | (void) touch("/var/lib/systemd/timesync/clock"); |
2dd79846 | 358 | (void) touch("/run/systemd/timesync/synchronized"); |
84e51726 LP |
359 | |
360 | m->drift_ppm = tmx.freq / 65536; | |
361 | ||
362 | log_debug(" status : %04i %s\n" | |
0060bb8f | 363 | " time now : %"PRI_TIME".%03"PRI_USEC"\n" |
3bd7ef83 | 364 | " constant : %"PRI_TIMEX"\n" |
84e51726 | 365 | " offset : %+.3f sec\n" |
3bd7ef83 | 366 | " freq offset : %+"PRI_TIMEX" (%i ppm)\n", |
84e51726 | 367 | tmx.status, tmx.status & STA_UNSYNC ? "unsync" : "sync", |
70887c5f | 368 | tmx.time.tv_sec, tmx.time.tv_usec / NSEC_PER_MSEC, |
84e51726 LP |
369 | tmx.constant, |
370 | (double)tmx.offset / NSEC_PER_SEC, | |
371 | tmx.freq, m->drift_ppm); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { | |
377 | unsigned int i, idx_cur, idx_new, idx_min; | |
378 | double jitter; | |
379 | double j; | |
380 | ||
381 | assert(m); | |
382 | ||
383 | m->packet_count++; | |
384 | ||
385 | /* ignore initial sample */ | |
386 | if (m->packet_count == 1) | |
387 | return false; | |
388 | ||
389 | /* store the current data in our samples array */ | |
390 | idx_cur = m->samples_idx; | |
391 | idx_new = (idx_cur + 1) % ELEMENTSOF(m->samples); | |
392 | m->samples_idx = idx_new; | |
393 | m->samples[idx_new].offset = offset; | |
394 | m->samples[idx_new].delay = delay; | |
395 | ||
396 | /* calculate new jitter value from the RMS differences relative to the lowest delay sample */ | |
397 | jitter = m->samples_jitter; | |
398 | for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(m->samples); i++) | |
399 | if (m->samples[i].delay > 0 && m->samples[i].delay < m->samples[idx_min].delay) | |
400 | idx_min = i; | |
401 | ||
402 | j = 0; | |
403 | for (i = 0; i < ELEMENTSOF(m->samples); i++) | |
fa66b606 | 404 | j += pow(m->samples[i].offset - m->samples[idx_min].offset, 2); |
84e51726 LP |
405 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); |
406 | ||
407 | /* ignore samples when resyncing */ | |
408 | if (m->poll_resync) | |
409 | return false; | |
410 | ||
411 | /* always accept offset if we are farther off than the round-trip delay */ | |
412 | if (fabs(offset) > delay) | |
413 | return false; | |
414 | ||
415 | /* we need a few samples before looking at them */ | |
416 | if (m->packet_count < 4) | |
417 | return false; | |
418 | ||
419 | /* do not accept anything worse than the maximum possible error of the best sample */ | |
420 | if (fabs(offset) > m->samples[idx_min].delay) | |
421 | return true; | |
422 | ||
423 | /* compare the difference between the current offset to the previous offset and jitter */ | |
424 | return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter; | |
425 | } | |
426 | ||
427 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { | |
428 | assert(m); | |
429 | ||
430 | if (m->poll_resync) { | |
a4465d0d | 431 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
432 | m->poll_resync = false; |
433 | return; | |
434 | } | |
435 | ||
436 | /* set to minimal poll interval */ | |
437 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { | |
a4465d0d | 438 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
439 | return; |
440 | } | |
441 | ||
442 | /* increase polling interval */ | |
443 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { | |
a4465d0d | 444 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
84e51726 LP |
445 | m->poll_interval_usec *= 2; |
446 | return; | |
447 | } | |
448 | ||
449 | /* decrease polling interval */ | |
450 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { | |
a4465d0d | 451 | if (m->poll_interval_usec > m->poll_interval_min_usec) |
84e51726 LP |
452 | m->poll_interval_usec /= 2; |
453 | return; | |
454 | } | |
455 | } | |
456 | ||
457 | static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
458 | Manager *m = userdata; | |
459 | struct ntp_msg ntpmsg; | |
460 | ||
461 | struct iovec iov = { | |
462 | .iov_base = &ntpmsg, | |
463 | .iov_len = sizeof(ntpmsg), | |
464 | }; | |
465 | union { | |
466 | struct cmsghdr cmsghdr; | |
467 | uint8_t buf[CMSG_SPACE(sizeof(struct timeval))]; | |
468 | } control; | |
469 | union sockaddr_union server_addr; | |
470 | struct msghdr msghdr = { | |
471 | .msg_iov = &iov, | |
472 | .msg_iovlen = 1, | |
473 | .msg_control = &control, | |
474 | .msg_controllen = sizeof(control), | |
475 | .msg_name = &server_addr, | |
476 | .msg_namelen = sizeof(server_addr), | |
477 | }; | |
478 | struct cmsghdr *cmsg; | |
1cc6c93a | 479 | struct timespec *recv_time = NULL; |
84e51726 LP |
480 | ssize_t len; |
481 | double origin, receive, trans, dest; | |
482 | double delay, offset; | |
3af0442c | 483 | double root_distance; |
84e51726 LP |
484 | bool spike; |
485 | int leap_sec; | |
486 | int r; | |
487 | ||
488 | assert(source); | |
489 | assert(m); | |
490 | ||
491 | if (revents & (EPOLLHUP|EPOLLERR)) { | |
492 | log_warning("Server connection returned error."); | |
493 | return manager_connect(m); | |
494 | } | |
495 | ||
a38d9945 | 496 | len = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
84e51726 LP |
497 | if (len < 0) { |
498 | if (errno == EAGAIN) | |
499 | return 0; | |
500 | ||
501 | log_warning("Error receiving message. Disconnecting."); | |
502 | return manager_connect(m); | |
503 | } | |
504 | ||
43fcd650 TM |
505 | /* Too short or too long packet? */ |
506 | if (iov.iov_len < sizeof(struct ntp_msg) || (msghdr.msg_flags & MSG_TRUNC)) { | |
84e51726 LP |
507 | log_warning("Invalid response from server. Disconnecting."); |
508 | return manager_connect(m); | |
509 | } | |
510 | ||
511 | if (!m->current_server_name || | |
512 | !m->current_server_address || | |
513 | !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) { | |
514 | log_debug("Response from unknown server."); | |
515 | return 0; | |
516 | } | |
517 | ||
2a1288ff | 518 | CMSG_FOREACH(cmsg, &msghdr) { |
84e51726 LP |
519 | if (cmsg->cmsg_level != SOL_SOCKET) |
520 | continue; | |
521 | ||
522 | switch (cmsg->cmsg_type) { | |
487a3682 ML |
523 | case SCM_TIMESTAMPNS: |
524 | recv_time = (struct timespec *) CMSG_DATA(cmsg); | |
84e51726 LP |
525 | break; |
526 | } | |
527 | } | |
528 | if (!recv_time) { | |
529 | log_error("Invalid packet timestamp."); | |
530 | return -EINVAL; | |
531 | } | |
532 | ||
533 | if (!m->pending) { | |
534 | log_debug("Unexpected reply. Ignoring."); | |
535 | return 0; | |
536 | } | |
537 | ||
e8206972 ML |
538 | m->missed_replies = 0; |
539 | ||
84e51726 LP |
540 | /* check our "time cookie" (we just stored nanoseconds in the fraction field) */ |
541 | if (be32toh(ntpmsg.origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 || | |
edd50d5e | 542 | be32toh(ntpmsg.origin_time.frac) != (unsigned long) m->trans_time.tv_nsec) { |
84e51726 LP |
543 | log_debug("Invalid reply; not our transmit time. Ignoring."); |
544 | return 0; | |
545 | } | |
546 | ||
547 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
548 | ||
549 | if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 || | |
550 | be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) { | |
551 | log_debug("Invalid reply, returned times before epoch. Ignoring."); | |
552 | return manager_connect(m); | |
553 | } | |
554 | ||
07610e10 ML |
555 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC || |
556 | ntpmsg.stratum == 0 || ntpmsg.stratum >= 16) { | |
84e51726 LP |
557 | log_debug("Server is not synchronized. Disconnecting."); |
558 | return manager_connect(m); | |
559 | } | |
560 | ||
561 | if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) { | |
562 | log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field)); | |
563 | return manager_connect(m); | |
564 | } | |
565 | ||
566 | if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) { | |
567 | log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field)); | |
568 | return manager_connect(m); | |
569 | } | |
570 | ||
3af0442c | 571 | root_distance = ntp_ts_short_to_d(&ntpmsg.root_delay) / 2 + ntp_ts_short_to_d(&ntpmsg.root_dispersion); |
f907cc16 | 572 | if (root_distance > (double) m->max_root_distance_usec / (double) USEC_PER_SEC) { |
3af0442c ML |
573 | log_debug("Server has too large root distance. Disconnecting."); |
574 | return manager_connect(m); | |
575 | } | |
576 | ||
84e51726 LP |
577 | /* valid packet */ |
578 | m->pending = false; | |
ab4df227 | 579 | m->retry_interval = 0; |
84e51726 | 580 | |
7b628891 | 581 | /* Stop listening */ |
f89c4e15 | 582 | manager_listen_stop(m); |
7b628891 | 583 | |
84e51726 LP |
584 | /* announce leap seconds */ |
585 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) | |
586 | leap_sec = 1; | |
587 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) | |
588 | leap_sec = -1; | |
589 | else | |
590 | leap_sec = 0; | |
591 | ||
592 | /* | |
593 | * "Timestamp Name ID When Generated | |
594 | * ------------------------------------------------------------ | |
595 | * Originate Timestamp T1 time request sent by client | |
596 | * Receive Timestamp T2 time request received by server | |
597 | * Transmit Timestamp T3 time reply sent by server | |
598 | * Destination Timestamp T4 time reply received by client | |
599 | * | |
600 | * The round-trip delay, d, and system clock offset, t, are defined as: | |
601 | * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2" | |
602 | */ | |
73c76e63 | 603 | origin = ts_to_d(&m->trans_time) + OFFSET_1900_1970; |
84e51726 LP |
604 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
605 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
487a3682 | 606 | dest = ts_to_d(recv_time) + OFFSET_1900_1970; |
84e51726 LP |
607 | |
608 | offset = ((receive - origin) + (trans - dest)) / 2; | |
609 | delay = (dest - origin) - (trans - receive); | |
610 | ||
611 | spike = manager_sample_spike_detection(m, offset, delay); | |
612 | ||
613 | manager_adjust_poll(m, offset, spike); | |
614 | ||
615 | log_debug("NTP response:\n" | |
616 | " leap : %u\n" | |
617 | " version : %u\n" | |
618 | " mode : %u\n" | |
619 | " stratum : %u\n" | |
620 | " precision : %.6f sec (%d)\n" | |
3af0442c | 621 | " root distance: %.6f sec\n" |
84e51726 LP |
622 | " reference : %.4s\n" |
623 | " origin : %.3f\n" | |
624 | " receive : %.3f\n" | |
625 | " transmit : %.3f\n" | |
626 | " dest : %.3f\n" | |
627 | " offset : %+.3f sec\n" | |
628 | " delay : %+.3f sec\n" | |
629 | " packet count : %"PRIu64"\n" | |
630 | " jitter : %.3f%s\n" | |
631 | " poll interval: " USEC_FMT "\n", | |
632 | NTP_FIELD_LEAP(ntpmsg.field), | |
633 | NTP_FIELD_VERSION(ntpmsg.field), | |
634 | NTP_FIELD_MODE(ntpmsg.field), | |
635 | ntpmsg.stratum, | |
636 | exp2(ntpmsg.precision), ntpmsg.precision, | |
3af0442c | 637 | root_distance, |
84e51726 LP |
638 | ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a", |
639 | origin - OFFSET_1900_1970, | |
640 | receive - OFFSET_1900_1970, | |
641 | trans - OFFSET_1900_1970, | |
642 | dest - OFFSET_1900_1970, | |
643 | offset, delay, | |
644 | m->packet_count, | |
645 | m->samples_jitter, spike ? " spike" : "", | |
646 | m->poll_interval_usec / USEC_PER_SEC); | |
647 | ||
648 | if (!spike) { | |
649 | m->sync = true; | |
650 | r = manager_adjust_clock(m, offset, leap_sec); | |
651 | if (r < 0) | |
6ff6f4d8 | 652 | log_error_errno(r, "Failed to call clock_adjtime(): %m"); |
84e51726 LP |
653 | } |
654 | ||
7b5b3fc3 LP |
655 | log_debug("interval/delta/delay/jitter/drift " USEC_FMT "s/%+.3fs/%.3fs/%.3fs/%+ippm%s", |
656 | m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_ppm, | |
657 | spike ? " (ignored)" : ""); | |
84e51726 | 658 | |
481b3f9e LP |
659 | if (!m->good) { |
660 | _cleanup_free_ char *pretty = NULL; | |
661 | ||
662 | m->good = true; | |
663 | ||
664 | server_address_pretty(m->current_server_address, &pretty); | |
665 | log_info("Synchronized to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
666 | sd_notifyf(false, "STATUS=Synchronized to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
667 | } | |
668 | ||
84e51726 | 669 | r = manager_arm_timer(m, m->poll_interval_usec); |
f647962d MS |
670 | if (r < 0) |
671 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
84e51726 LP |
672 | |
673 | return 0; | |
674 | } | |
675 | ||
676 | static int manager_listen_setup(Manager *m) { | |
677 | union sockaddr_union addr = {}; | |
678 | static const int tos = IPTOS_LOWDELAY; | |
679 | static const int on = 1; | |
680 | int r; | |
681 | ||
682 | assert(m); | |
683 | ||
f89c4e15 LP |
684 | if (m->server_socket >= 0) |
685 | return 0; | |
686 | ||
84e51726 LP |
687 | assert(!m->event_receive); |
688 | assert(m->current_server_address); | |
689 | ||
690 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; | |
691 | ||
692 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); | |
693 | if (m->server_socket < 0) | |
694 | return -errno; | |
695 | ||
696 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); | |
697 | if (r < 0) | |
698 | return -errno; | |
699 | ||
487a3682 | 700 | r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, &on, sizeof(on)); |
84e51726 LP |
701 | if (r < 0) |
702 | return -errno; | |
703 | ||
69f00817 | 704 | (void) setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
84e51726 LP |
705 | |
706 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); | |
707 | } | |
708 | ||
f89c4e15 LP |
709 | static void manager_listen_stop(Manager *m) { |
710 | assert(m); | |
711 | ||
712 | m->event_receive = sd_event_source_unref(m->event_receive); | |
713 | m->server_socket = safe_close(m->server_socket); | |
714 | } | |
715 | ||
84e51726 LP |
716 | static int manager_begin(Manager *m) { |
717 | _cleanup_free_ char *pretty = NULL; | |
718 | int r; | |
719 | ||
720 | assert(m); | |
721 | assert_return(m->current_server_name, -EHOSTUNREACH); | |
722 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
723 | ||
481b3f9e | 724 | m->good = false; |
e8206972 | 725 | m->missed_replies = NTP_MAX_MISSED_REPLIES; |
80cd2606 | 726 | if (m->poll_interval_usec == 0) |
a4465d0d | 727 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
728 | |
729 | server_address_pretty(m->current_server_address, &pretty); | |
481b3f9e LP |
730 | log_debug("Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); |
731 | sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
84e51726 | 732 | |
84e51726 LP |
733 | r = manager_clock_watch_setup(m); |
734 | if (r < 0) | |
735 | return r; | |
736 | ||
737 | return manager_send_request(m); | |
738 | } | |
739 | ||
874ff7bf LP |
740 | void manager_set_server_name(Manager *m, ServerName *n) { |
741 | assert(m); | |
84e51726 | 742 | |
874ff7bf LP |
743 | if (m->current_server_name == n) |
744 | return; | |
84e51726 | 745 | |
874ff7bf LP |
746 | m->current_server_name = n; |
747 | m->current_server_address = NULL; | |
748 | ||
749 | manager_disconnect(m); | |
84e51726 | 750 | |
874ff7bf LP |
751 | if (n) |
752 | log_debug("Selected server %s.", n->string); | |
753 | } | |
84e51726 | 754 | |
874ff7bf | 755 | void manager_set_server_address(Manager *m, ServerAddress *a) { |
84e51726 LP |
756 | assert(m); |
757 | ||
874ff7bf LP |
758 | if (m->current_server_address == a) |
759 | return; | |
760 | ||
874ff7bf | 761 | m->current_server_address = a; |
20f8d3cf SN |
762 | /* If a is NULL, we are just clearing the address, without |
763 | * changing the name. Keep the existing name in that case. */ | |
764 | if (a) | |
765 | m->current_server_name = a->name; | |
874ff7bf LP |
766 | |
767 | manager_disconnect(m); | |
768 | ||
769 | if (a) { | |
770 | _cleanup_free_ char *pretty = NULL; | |
771 | server_address_pretty(a, &pretty); | |
772 | log_debug("Selected address %s of server %s.", strna(pretty), a->name->string); | |
84e51726 LP |
773 | } |
774 | } | |
775 | ||
776 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { | |
777 | Manager *m = userdata; | |
874ff7bf | 778 | int r; |
84e51726 LP |
779 | |
780 | assert(q); | |
781 | assert(m); | |
782 | assert(m->current_server_name); | |
783 | ||
784 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
785 | ||
786 | if (ret != 0) { | |
787 | log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); | |
788 | ||
789 | /* Try next host */ | |
790 | return manager_connect(m); | |
791 | } | |
792 | ||
84e51726 LP |
793 | for (; ai; ai = ai->ai_next) { |
794 | _cleanup_free_ char *pretty = NULL; | |
874ff7bf | 795 | ServerAddress *a; |
84e51726 LP |
796 | |
797 | assert(ai->ai_addr); | |
798 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
84e51726 LP |
799 | |
800 | if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) { | |
801 | log_warning("Unsuitable address protocol for %s", m->current_server_name->string); | |
802 | continue; | |
803 | } | |
804 | ||
874ff7bf | 805 | r = server_address_new(m->current_server_name, &a, (const union sockaddr_union*) ai->ai_addr, ai->ai_addrlen); |
f647962d MS |
806 | if (r < 0) |
807 | return log_error_errno(r, "Failed to add server address: %m"); | |
84e51726 | 808 | |
874ff7bf | 809 | server_address_pretty(a, &pretty); |
84e51726 LP |
810 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
811 | } | |
812 | ||
813 | if (!m->current_server_name->addresses) { | |
814 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
815 | ||
816 | /* Try next host */ | |
817 | return manager_connect(m); | |
818 | } | |
819 | ||
874ff7bf | 820 | manager_set_server_address(m, m->current_server_name->addresses); |
84e51726 LP |
821 | |
822 | return manager_begin(m); | |
823 | } | |
824 | ||
874ff7bf | 825 | static int manager_retry_connect(sd_event_source *source, usec_t usec, void *userdata) { |
84e51726 LP |
826 | Manager *m = userdata; |
827 | ||
828 | assert(m); | |
829 | ||
830 | return manager_connect(m); | |
831 | } | |
832 | ||
833 | int manager_connect(Manager *m) { | |
84e51726 LP |
834 | int r; |
835 | ||
836 | assert(m); | |
837 | ||
838 | manager_disconnect(m); | |
839 | ||
840 | m->event_retry = sd_event_source_unref(m->event_retry); | |
841 | if (!ratelimit_test(&m->ratelimit)) { | |
842 | log_debug("Slowing down attempts to contact servers."); | |
843 | ||
874ff7bf | 844 | 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 |
845 | if (r < 0) |
846 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
84e51726 LP |
847 | |
848 | return 0; | |
849 | } | |
850 | ||
851 | /* If we already are operating on some address, switch to the | |
852 | * next one. */ | |
853 | if (m->current_server_address && m->current_server_address->addresses_next) | |
874ff7bf | 854 | manager_set_server_address(m, m->current_server_address->addresses_next); |
84e51726 | 855 | else { |
874ff7bf LP |
856 | struct addrinfo hints = { |
857 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, | |
858 | .ai_socktype = SOCK_DGRAM, | |
859 | }; | |
84e51726 | 860 | |
874ff7bf | 861 | /* Hmm, we are through all addresses, let's look for the next host instead */ |
84e51726 | 862 | if (m->current_server_name && m->current_server_name->names_next) |
874ff7bf | 863 | manager_set_server_name(m, m->current_server_name->names_next); |
84e51726 | 864 | else { |
874ff7bf | 865 | ServerName *f; |
63463bf0 | 866 | bool restart = true; |
874ff7bf LP |
867 | |
868 | /* Our current server name list is exhausted, | |
869 | * let's find the next one to iterate. First | |
870 | * we try the system list, then the link list. | |
871 | * After having processed the link list we | |
872 | * jump back to the system list. However, if | |
873 | * both lists are empty, we change to the | |
874 | * fallback list. */ | |
875 | if (!m->current_server_name || m->current_server_name->type == SERVER_LINK) { | |
876 | f = m->system_servers; | |
877 | if (!f) | |
878 | f = m->link_servers; | |
879 | } else { | |
880 | f = m->link_servers; | |
881 | if (!f) | |
882 | f = m->system_servers; | |
63463bf0 ML |
883 | else |
884 | restart = false; | |
874ff7bf LP |
885 | } |
886 | ||
887 | if (!f) | |
888 | f = m->fallback_servers; | |
889 | ||
890 | if (!f) { | |
891 | manager_set_server_name(m, NULL); | |
84e51726 LP |
892 | log_debug("No server found."); |
893 | return 0; | |
894 | } | |
895 | ||
63463bf0 ML |
896 | if (restart && !m->exhausted_servers && m->poll_interval_usec) { |
897 | log_debug("Waiting after exhausting servers."); | |
898 | 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 |
899 | if (r < 0) |
900 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
63463bf0 ML |
901 | |
902 | m->exhausted_servers = true; | |
903 | ||
904 | /* Increase the polling interval */ | |
a4465d0d | 905 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
63463bf0 ML |
906 | m->poll_interval_usec *= 2; |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
911 | m->exhausted_servers = false; | |
912 | ||
874ff7bf | 913 | manager_set_server_name(m, f); |
84e51726 LP |
914 | } |
915 | ||
916 | /* Tell the resolver to reread /etc/resolv.conf, in | |
917 | * case it changed. */ | |
918 | res_init(); | |
919 | ||
874ff7bf LP |
920 | /* Flush out any previously resolved addresses */ |
921 | server_name_flush_addresses(m->current_server_name); | |
922 | ||
923 | log_debug("Resolving %s...", m->current_server_name->string); | |
924 | ||
84e51726 | 925 | r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m); |
f647962d MS |
926 | if (r < 0) |
927 | return log_error_errno(r, "Failed to create resolver: %m"); | |
84e51726 LP |
928 | |
929 | return 1; | |
930 | } | |
931 | ||
932 | r = manager_begin(m); | |
933 | if (r < 0) | |
934 | return r; | |
935 | ||
936 | return 1; | |
937 | } | |
938 | ||
84e51726 LP |
939 | void manager_disconnect(Manager *m) { |
940 | assert(m); | |
941 | ||
942 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
943 | ||
944 | m->event_timer = sd_event_source_unref(m->event_timer); | |
945 | ||
f89c4e15 | 946 | manager_listen_stop(m); |
84e51726 LP |
947 | |
948 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
949 | m->clock_watch_fd = safe_close(m->clock_watch_fd); | |
950 | ||
951 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
952 | ||
953 | sd_notifyf(false, "STATUS=Idle."); | |
954 | } | |
955 | ||
874ff7bf LP |
956 | void manager_flush_server_names(Manager *m, ServerType t) { |
957 | assert(m); | |
958 | ||
959 | if (t == SERVER_SYSTEM) | |
960 | while (m->system_servers) | |
961 | server_name_free(m->system_servers); | |
962 | ||
963 | if (t == SERVER_LINK) | |
964 | while (m->link_servers) | |
965 | server_name_free(m->link_servers); | |
966 | ||
967 | if (t == SERVER_FALLBACK) | |
968 | while (m->fallback_servers) | |
969 | server_name_free(m->fallback_servers); | |
970 | } | |
84e51726 LP |
971 | |
972 | void manager_free(Manager *m) { | |
973 | if (!m) | |
974 | return; | |
975 | ||
976 | manager_disconnect(m); | |
874ff7bf LP |
977 | manager_flush_server_names(m, SERVER_SYSTEM); |
978 | manager_flush_server_names(m, SERVER_LINK); | |
979 | manager_flush_server_names(m, SERVER_FALLBACK); | |
84e51726 LP |
980 | |
981 | sd_event_source_unref(m->event_retry); | |
982 | ||
983 | sd_event_source_unref(m->network_event_source); | |
984 | sd_network_monitor_unref(m->network_monitor); | |
985 | ||
986 | sd_resolve_unref(m->resolve); | |
987 | sd_event_unref(m->event); | |
988 | ||
989 | free(m); | |
990 | } | |
991 | ||
874ff7bf LP |
992 | static int manager_network_read_link_servers(Manager *m) { |
993 | _cleanup_strv_free_ char **ntp = NULL; | |
994 | ServerName *n, *nx; | |
995 | char **i; | |
3e85ec07 | 996 | bool changed = false; |
874ff7bf LP |
997 | int r; |
998 | ||
84e51726 LP |
999 | assert(m); |
1000 | ||
874ff7bf LP |
1001 | r = sd_network_get_ntp(&ntp); |
1002 | if (r < 0) | |
1003 | goto clear; | |
1004 | ||
1005 | LIST_FOREACH(names, n, m->link_servers) | |
1006 | n->marked = true; | |
1007 | ||
1008 | STRV_FOREACH(i, ntp) { | |
1009 | bool found = false; | |
1010 | ||
1011 | LIST_FOREACH(names, n, m->link_servers) | |
1012 | if (streq(n->string, *i)) { | |
1013 | n->marked = false; | |
1014 | found = true; | |
1015 | break; | |
1016 | } | |
1017 | ||
1018 | if (!found) { | |
1019 | r = server_name_new(m, NULL, SERVER_LINK, *i); | |
1020 | if (r < 0) | |
1021 | goto clear; | |
3e85ec07 YW |
1022 | |
1023 | changed = true; | |
874ff7bf LP |
1024 | } |
1025 | } | |
1026 | ||
1027 | LIST_FOREACH_SAFE(names, n, nx, m->link_servers) | |
3e85ec07 | 1028 | if (n->marked) { |
874ff7bf | 1029 | server_name_free(n); |
3e85ec07 YW |
1030 | changed = true; |
1031 | } | |
874ff7bf | 1032 | |
3e85ec07 | 1033 | return changed; |
874ff7bf LP |
1034 | |
1035 | clear: | |
1036 | manager_flush_server_names(m, SERVER_LINK); | |
1037 | return r; | |
84e51726 LP |
1038 | } |
1039 | ||
1040 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1041 | Manager *m = userdata; | |
3e85ec07 | 1042 | bool changed, connected, online; |
84e51726 LP |
1043 | int r; |
1044 | ||
1045 | assert(m); | |
1046 | ||
1047 | sd_network_monitor_flush(m->network_monitor); | |
1048 | ||
3e85ec07 | 1049 | changed = !!manager_network_read_link_servers(m); |
874ff7bf | 1050 | |
84e51726 LP |
1051 | /* check if the machine is online */ |
1052 | online = network_is_online(); | |
1053 | ||
1054 | /* check if the client is currently connected */ | |
63463bf0 | 1055 | connected = m->server_socket >= 0 || m->resolve_query || m->exhausted_servers; |
84e51726 LP |
1056 | |
1057 | if (connected && !online) { | |
1058 | log_info("No network connectivity, watching for changes."); | |
1059 | manager_disconnect(m); | |
1060 | ||
3e85ec07 | 1061 | } else if (!connected && online && changed) { |
84e51726 LP |
1062 | log_info("Network configuration changed, trying to establish connection."); |
1063 | ||
1064 | if (m->current_server_address) | |
1065 | r = manager_begin(m); | |
1066 | else | |
1067 | r = manager_connect(m); | |
1068 | if (r < 0) | |
1069 | return r; | |
1070 | } | |
1071 | ||
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | static int manager_network_monitor_listen(Manager *m) { | |
1076 | int r, fd, events; | |
1077 | ||
1078 | assert(m); | |
1079 | ||
1080 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
36484c03 | 1081 | if (r == -ENOENT) { |
f95b0be7 | 1082 | log_info("systemd does not appear to be running, not listening for systemd-networkd events."); |
36484c03 ZJS |
1083 | return 0; |
1084 | } | |
84e51726 LP |
1085 | if (r < 0) |
1086 | return r; | |
1087 | ||
1088 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
1089 | if (fd < 0) | |
1090 | return fd; | |
1091 | ||
1092 | events = sd_network_monitor_get_events(m->network_monitor); | |
1093 | if (events < 0) | |
1094 | return events; | |
1095 | ||
1096 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, manager_network_event_handler, m); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | ||
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | int manager_new(Manager **ret) { | |
1104 | _cleanup_(manager_freep) Manager *m = NULL; | |
1105 | int r; | |
1106 | ||
1107 | assert(ret); | |
1108 | ||
1109 | m = new0(Manager, 1); | |
1110 | if (!m) | |
1111 | return -ENOMEM; | |
1112 | ||
f907cc16 | 1113 | m->max_root_distance_usec = NTP_MAX_ROOT_DISTANCE; |
a4465d0d YW |
1114 | m->poll_interval_min_usec = NTP_POLL_INTERVAL_MIN_USEC; |
1115 | m->poll_interval_max_usec = NTP_POLL_INTERVAL_MAX_USEC; | |
f907cc16 | 1116 | |
84e51726 LP |
1117 | m->server_socket = m->clock_watch_fd = -1; |
1118 | ||
1119 | RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST); | |
1120 | ||
84e51726 LP |
1121 | r = sd_event_default(&m->event); |
1122 | if (r < 0) | |
1123 | return r; | |
1124 | ||
1125 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
1126 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
1127 | ||
1128 | sd_event_set_watchdog(m->event, true); | |
1129 | ||
1130 | r = sd_resolve_default(&m->resolve); | |
1131 | if (r < 0) | |
1132 | return r; | |
1133 | ||
1134 | r = sd_resolve_attach_event(m->resolve, m->event, 0); | |
1135 | if (r < 0) | |
1136 | return r; | |
1137 | ||
1138 | r = manager_network_monitor_listen(m); | |
1139 | if (r < 0) | |
1140 | return r; | |
1141 | ||
c572db3c | 1142 | manager_network_read_link_servers(m); |
874ff7bf | 1143 | |
1cc6c93a | 1144 | *ret = TAKE_PTR(m); |
84e51726 LP |
1145 | |
1146 | return 0; | |
1147 | } |