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84e51726 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Kay Sievers, Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <stdlib.h> | |
23 | #include <errno.h> | |
24 | #include <fcntl.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <time.h> | |
28 | #include <math.h> | |
29 | #include <arpa/inet.h> | |
30 | #include <netinet/in.h> | |
31 | #include <netinet/ip.h> | |
32 | #include <sys/timerfd.h> | |
33 | #include <sys/timex.h> | |
34 | #include <sys/socket.h> | |
35 | #include <resolv.h> | |
36 | #include <sys/prctl.h> | |
37 | #include <sys/types.h> | |
38 | #include <grp.h> | |
39 | ||
40 | #include "missing.h" | |
41 | #include "util.h" | |
42 | #include "sparse-endian.h" | |
43 | #include "log.h" | |
44 | #include "socket-util.h" | |
45 | #include "list.h" | |
46 | #include "ratelimit.h" | |
47 | #include "strv.h" | |
48 | #include "conf-parser.h" | |
49 | #include "sd-daemon.h" | |
50 | #include "event-util.h" | |
51 | #include "network-util.h" | |
52 | #include "clock-util.h" | |
53 | #include "capability.h" | |
54 | #include "mkdir.h" | |
55 | #include "timesyncd-conf.h" | |
56 | #include "timesyncd-manager.h" | |
57 | ||
58 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) | |
59 | ||
60 | #ifndef ADJ_SETOFFSET | |
61 | #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */ | |
62 | #endif | |
63 | ||
64 | /* expected accuracy of time synchronization; used to adjust the poll interval */ | |
65 | #define NTP_ACCURACY_SEC 0.2 | |
66 | ||
67 | /* | |
68 | * "A client MUST NOT under any conditions use a poll interval less | |
69 | * than 15 seconds." | |
70 | */ | |
71 | #define NTP_POLL_INTERVAL_MIN_SEC 32 | |
72 | #define NTP_POLL_INTERVAL_MAX_SEC 2048 | |
73 | ||
74 | /* | |
75 | * Maximum delta in seconds which the system clock is gradually adjusted | |
76 | * (slew) to approach the network time. Deltas larger that this are set by | |
77 | * letting the system time jump. The kernel's limit for adjtime is 0.5s. | |
78 | */ | |
79 | #define NTP_MAX_ADJUST 0.4 | |
80 | ||
81 | /* NTP protocol, packet header */ | |
82 | #define NTP_LEAP_PLUSSEC 1 | |
83 | #define NTP_LEAP_MINUSSEC 2 | |
84 | #define NTP_LEAP_NOTINSYNC 3 | |
85 | #define NTP_MODE_CLIENT 3 | |
86 | #define NTP_MODE_SERVER 4 | |
87 | #define NTP_FIELD_LEAP(f) (((f) >> 6) & 3) | |
88 | #define NTP_FIELD_VERSION(f) (((f) >> 3) & 7) | |
89 | #define NTP_FIELD_MODE(f) ((f) & 7) | |
90 | #define NTP_FIELD(l, v, m) (((l) << 6) | ((v) << 3) | (m)) | |
91 | ||
3af0442c ML |
92 | /* Maximum acceptable root distance in seconds. */ |
93 | #define NTP_MAX_ROOT_DISTANCE 5.0 | |
94 | ||
e8206972 ML |
95 | /* Maximum number of missed replies before selecting another source. */ |
96 | #define NTP_MAX_MISSED_REPLIES 2 | |
97 | ||
84e51726 LP |
98 | /* |
99 | * "NTP timestamps are represented as a 64-bit unsigned fixed-point number, | |
100 | * in seconds relative to 0h on 1 January 1900." | |
101 | */ | |
102 | #define OFFSET_1900_1970 2208988800UL | |
103 | ||
104 | #define RETRY_USEC (30*USEC_PER_SEC) | |
105 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) | |
106 | #define RATELIMIT_BURST 10 | |
107 | ||
108 | #define TIMEOUT_USEC (10*USEC_PER_SEC) | |
109 | ||
110 | struct ntp_ts { | |
111 | be32_t sec; | |
112 | be32_t frac; | |
113 | } _packed_; | |
114 | ||
115 | struct ntp_ts_short { | |
116 | be16_t sec; | |
117 | be16_t frac; | |
118 | } _packed_; | |
119 | ||
120 | struct ntp_msg { | |
121 | uint8_t field; | |
122 | uint8_t stratum; | |
123 | int8_t poll; | |
124 | int8_t precision; | |
125 | struct ntp_ts_short root_delay; | |
126 | struct ntp_ts_short root_dispersion; | |
127 | char refid[4]; | |
128 | struct ntp_ts reference_time; | |
129 | struct ntp_ts origin_time; | |
130 | struct ntp_ts recv_time; | |
131 | struct ntp_ts trans_time; | |
132 | } _packed_; | |
133 | ||
134 | static int manager_arm_timer(Manager *m, usec_t next); | |
135 | static int manager_clock_watch_setup(Manager *m); | |
136 | ||
3af0442c ML |
137 | static double ntp_ts_short_to_d(const struct ntp_ts_short *ts) { |
138 | return be16toh(ts->sec) + (be16toh(ts->frac) / 65536.0); | |
139 | } | |
140 | ||
84e51726 LP |
141 | static double ntp_ts_to_d(const struct ntp_ts *ts) { |
142 | return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX); | |
143 | } | |
144 | ||
145 | static double ts_to_d(const struct timespec *ts) { | |
146 | return ts->tv_sec + (1.0e-9 * ts->tv_nsec); | |
147 | } | |
148 | ||
84e51726 LP |
149 | static double square(double d) { |
150 | return d * d; | |
151 | } | |
152 | ||
153 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { | |
154 | _cleanup_free_ char *pretty = NULL; | |
155 | Manager *m = userdata; | |
156 | ||
157 | assert(m); | |
158 | assert(m->current_server_name); | |
159 | assert(m->current_server_address); | |
160 | ||
161 | server_address_pretty(m->current_server_address, &pretty); | |
162 | log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string); | |
163 | ||
164 | return manager_connect(m); | |
165 | } | |
166 | ||
167 | static int manager_send_request(Manager *m) { | |
168 | _cleanup_free_ char *pretty = NULL; | |
169 | struct ntp_msg ntpmsg = { | |
170 | /* | |
171 | * "The client initializes the NTP message header, sends the request | |
172 | * to the server, and strips the time of day from the Transmit | |
173 | * Timestamp field of the reply. For this purpose, all the NTP | |
174 | * header fields are set to 0, except the Mode, VN, and optional | |
175 | * Transmit Timestamp fields." | |
176 | */ | |
177 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
178 | }; | |
179 | ssize_t len; | |
180 | int r; | |
181 | ||
182 | assert(m); | |
183 | assert(m->current_server_name); | |
184 | assert(m->current_server_address); | |
185 | ||
186 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
187 | ||
188 | /* | |
189 | * Set transmit timestamp, remember it; the server will send that back | |
190 | * as the origin timestamp and we have an indication that this is the | |
191 | * matching answer to our request. | |
192 | * | |
193 | * The actual value does not matter, We do not care about the correct | |
194 | * NTP UINT_MAX fraction; we just pass the plain nanosecond value. | |
195 | */ | |
196 | assert_se(clock_gettime(clock_boottime_or_monotonic(), &m->trans_time_mon) >= 0); | |
197 | assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0); | |
198 | ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970); | |
199 | ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec); | |
200 | ||
201 | server_address_pretty(m->current_server_address, &pretty); | |
202 | ||
203 | len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen); | |
204 | if (len == sizeof(ntpmsg)) { | |
205 | m->pending = true; | |
206 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); | |
207 | } else { | |
208 | log_debug("Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); | |
209 | return manager_connect(m); | |
210 | } | |
211 | ||
e8206972 ML |
212 | m->missed_replies++; |
213 | if (m->missed_replies > NTP_MAX_MISSED_REPLIES) { | |
214 | r = sd_event_add_time( | |
215 | m->event, | |
216 | &m->event_timeout, | |
217 | clock_boottime_or_monotonic(), | |
218 | now(clock_boottime_or_monotonic()) + TIMEOUT_USEC, 0, | |
219 | manager_timeout, m); | |
220 | if (r < 0) { | |
221 | log_error("Failed to arm timeout timer: %s", strerror(-r)); | |
222 | return r; | |
223 | } | |
84e51726 LP |
224 | } |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
230 | Manager *m = userdata; | |
231 | ||
232 | assert(m); | |
233 | ||
234 | return manager_send_request(m); | |
235 | } | |
236 | ||
237 | static int manager_arm_timer(Manager *m, usec_t next) { | |
238 | int r; | |
239 | ||
240 | assert(m); | |
241 | assert(m->event_receive); | |
242 | ||
243 | if (next == 0) { | |
244 | m->event_timer = sd_event_source_unref(m->event_timer); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | if (m->event_timer) { | |
249 | r = sd_event_source_set_time(m->event_timer, now(clock_boottime_or_monotonic()) + next); | |
250 | if (r < 0) | |
251 | return r; | |
252 | ||
253 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); | |
254 | } | |
255 | ||
256 | return sd_event_add_time( | |
257 | m->event, | |
258 | &m->event_timer, | |
259 | clock_boottime_or_monotonic(), | |
260 | now(clock_boottime_or_monotonic()) + next, 0, | |
261 | manager_timer, m); | |
262 | } | |
263 | ||
264 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
265 | Manager *m = userdata; | |
266 | ||
267 | assert(m); | |
268 | ||
269 | /* rearm timer */ | |
270 | manager_clock_watch_setup(m); | |
271 | ||
272 | /* skip our own jumps */ | |
273 | if (m->jumped) { | |
274 | m->jumped = false; | |
275 | return 0; | |
276 | } | |
277 | ||
278 | /* resync */ | |
279 | log_info("System time changed. Resyncing."); | |
280 | m->poll_resync = true; | |
281 | ||
282 | return manager_send_request(m); | |
283 | } | |
284 | ||
285 | /* wake up when the system time changes underneath us */ | |
286 | static int manager_clock_watch_setup(Manager *m) { | |
287 | ||
288 | struct itimerspec its = { | |
289 | .it_value.tv_sec = TIME_T_MAX | |
290 | }; | |
291 | ||
292 | int r; | |
293 | ||
294 | assert(m); | |
295 | ||
296 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
297 | safe_close(m->clock_watch_fd); | |
298 | ||
299 | m->clock_watch_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC); | |
300 | if (m->clock_watch_fd < 0) { | |
301 | log_error("Failed to create timerfd: %m"); | |
302 | return -errno; | |
303 | } | |
304 | ||
305 | if (timerfd_settime(m->clock_watch_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) { | |
306 | log_error("Failed to set up timerfd: %m"); | |
307 | return -errno; | |
308 | } | |
309 | ||
310 | r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m); | |
311 | if (r < 0) { | |
312 | log_error("Failed to create clock watch event source: %s", strerror(-r)); | |
313 | return r; | |
314 | } | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { | |
320 | struct timex tmx = {}; | |
321 | int r; | |
322 | ||
323 | assert(m); | |
324 | ||
325 | /* | |
326 | * For small deltas, tell the kernel to gradually adjust the system | |
327 | * clock to the NTP time, larger deltas are just directly set. | |
328 | */ | |
329 | if (fabs(offset) < NTP_MAX_ADJUST) { | |
330 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR; | |
331 | tmx.status = STA_PLL; | |
332 | tmx.offset = offset * NSEC_PER_SEC; | |
333 | tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4; | |
334 | tmx.maxerror = 0; | |
335 | tmx.esterror = 0; | |
336 | log_debug(" adjust (slew): %+.3f sec\n", offset); | |
337 | } else { | |
338 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_SETOFFSET; | |
339 | ||
340 | /* ADJ_NANO uses nanoseconds in the microseconds field */ | |
341 | tmx.time.tv_sec = (long)offset; | |
342 | tmx.time.tv_usec = (offset - tmx.time.tv_sec) * NSEC_PER_SEC; | |
343 | ||
344 | /* the kernel expects -0.3s as {-1, 7000.000.000} */ | |
345 | if (tmx.time.tv_usec < 0) { | |
346 | tmx.time.tv_sec -= 1; | |
347 | tmx.time.tv_usec += NSEC_PER_SEC; | |
348 | } | |
349 | ||
350 | m->jumped = true; | |
351 | log_debug(" adjust (jump): %+.3f sec\n", offset); | |
352 | } | |
353 | ||
354 | /* | |
355 | * An unset STA_UNSYNC will enable the kernel's 11-minute mode, | |
356 | * which syncs the system time periodically to the RTC. | |
357 | * | |
358 | * In case the RTC runs in local time, never touch the RTC, | |
359 | * we have no way to properly handle daylight saving changes and | |
360 | * mobile devices moving between time zones. | |
361 | */ | |
362 | if (m->rtc_local_time) | |
363 | tmx.status |= STA_UNSYNC; | |
364 | ||
365 | switch (leap_sec) { | |
366 | case 1: | |
367 | tmx.status |= STA_INS; | |
368 | break; | |
369 | case -1: | |
370 | tmx.status |= STA_DEL; | |
371 | break; | |
372 | } | |
373 | ||
374 | r = clock_adjtime(CLOCK_REALTIME, &tmx); | |
375 | if (r < 0) | |
376 | return r; | |
377 | ||
378 | touch("/var/lib/systemd/clock"); | |
379 | ||
380 | m->drift_ppm = tmx.freq / 65536; | |
381 | ||
382 | log_debug(" status : %04i %s\n" | |
383 | " time now : %li.%03llu\n" | |
384 | " constant : %li\n" | |
385 | " offset : %+.3f sec\n" | |
386 | " freq offset : %+li (%i ppm)\n", | |
387 | tmx.status, tmx.status & STA_UNSYNC ? "unsync" : "sync", | |
388 | tmx.time.tv_sec, (unsigned long long) (tmx.time.tv_usec / NSEC_PER_MSEC), | |
389 | tmx.constant, | |
390 | (double)tmx.offset / NSEC_PER_SEC, | |
391 | tmx.freq, m->drift_ppm); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { | |
397 | unsigned int i, idx_cur, idx_new, idx_min; | |
398 | double jitter; | |
399 | double j; | |
400 | ||
401 | assert(m); | |
402 | ||
403 | m->packet_count++; | |
404 | ||
405 | /* ignore initial sample */ | |
406 | if (m->packet_count == 1) | |
407 | return false; | |
408 | ||
409 | /* store the current data in our samples array */ | |
410 | idx_cur = m->samples_idx; | |
411 | idx_new = (idx_cur + 1) % ELEMENTSOF(m->samples); | |
412 | m->samples_idx = idx_new; | |
413 | m->samples[idx_new].offset = offset; | |
414 | m->samples[idx_new].delay = delay; | |
415 | ||
416 | /* calculate new jitter value from the RMS differences relative to the lowest delay sample */ | |
417 | jitter = m->samples_jitter; | |
418 | for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(m->samples); i++) | |
419 | if (m->samples[i].delay > 0 && m->samples[i].delay < m->samples[idx_min].delay) | |
420 | idx_min = i; | |
421 | ||
422 | j = 0; | |
423 | for (i = 0; i < ELEMENTSOF(m->samples); i++) | |
424 | j += square(m->samples[i].offset - m->samples[idx_min].offset); | |
425 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); | |
426 | ||
427 | /* ignore samples when resyncing */ | |
428 | if (m->poll_resync) | |
429 | return false; | |
430 | ||
431 | /* always accept offset if we are farther off than the round-trip delay */ | |
432 | if (fabs(offset) > delay) | |
433 | return false; | |
434 | ||
435 | /* we need a few samples before looking at them */ | |
436 | if (m->packet_count < 4) | |
437 | return false; | |
438 | ||
439 | /* do not accept anything worse than the maximum possible error of the best sample */ | |
440 | if (fabs(offset) > m->samples[idx_min].delay) | |
441 | return true; | |
442 | ||
443 | /* compare the difference between the current offset to the previous offset and jitter */ | |
444 | return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter; | |
445 | } | |
446 | ||
447 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { | |
448 | assert(m); | |
449 | ||
450 | if (m->poll_resync) { | |
451 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
452 | m->poll_resync = false; | |
453 | return; | |
454 | } | |
455 | ||
456 | /* set to minimal poll interval */ | |
457 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { | |
458 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
459 | return; | |
460 | } | |
461 | ||
462 | /* increase polling interval */ | |
463 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { | |
464 | if (m->poll_interval_usec < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) | |
465 | m->poll_interval_usec *= 2; | |
466 | return; | |
467 | } | |
468 | ||
469 | /* decrease polling interval */ | |
470 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { | |
471 | if (m->poll_interval_usec > NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC) | |
472 | m->poll_interval_usec /= 2; | |
473 | return; | |
474 | } | |
475 | } | |
476 | ||
477 | static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
478 | Manager *m = userdata; | |
479 | struct ntp_msg ntpmsg; | |
480 | ||
481 | struct iovec iov = { | |
482 | .iov_base = &ntpmsg, | |
483 | .iov_len = sizeof(ntpmsg), | |
484 | }; | |
485 | union { | |
486 | struct cmsghdr cmsghdr; | |
487 | uint8_t buf[CMSG_SPACE(sizeof(struct timeval))]; | |
488 | } control; | |
489 | union sockaddr_union server_addr; | |
490 | struct msghdr msghdr = { | |
491 | .msg_iov = &iov, | |
492 | .msg_iovlen = 1, | |
493 | .msg_control = &control, | |
494 | .msg_controllen = sizeof(control), | |
495 | .msg_name = &server_addr, | |
496 | .msg_namelen = sizeof(server_addr), | |
497 | }; | |
498 | struct cmsghdr *cmsg; | |
487a3682 | 499 | struct timespec *recv_time; |
84e51726 LP |
500 | ssize_t len; |
501 | double origin, receive, trans, dest; | |
502 | double delay, offset; | |
3af0442c | 503 | double root_distance; |
84e51726 LP |
504 | bool spike; |
505 | int leap_sec; | |
506 | int r; | |
507 | ||
508 | assert(source); | |
509 | assert(m); | |
510 | ||
511 | if (revents & (EPOLLHUP|EPOLLERR)) { | |
512 | log_warning("Server connection returned error."); | |
513 | return manager_connect(m); | |
514 | } | |
515 | ||
516 | len = recvmsg(fd, &msghdr, MSG_DONTWAIT); | |
517 | if (len < 0) { | |
518 | if (errno == EAGAIN) | |
519 | return 0; | |
520 | ||
521 | log_warning("Error receiving message. Disconnecting."); | |
522 | return manager_connect(m); | |
523 | } | |
524 | ||
525 | if (iov.iov_len < sizeof(struct ntp_msg)) { | |
526 | log_warning("Invalid response from server. Disconnecting."); | |
527 | return manager_connect(m); | |
528 | } | |
529 | ||
530 | if (!m->current_server_name || | |
531 | !m->current_server_address || | |
532 | !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) { | |
533 | log_debug("Response from unknown server."); | |
534 | return 0; | |
535 | } | |
536 | ||
537 | recv_time = NULL; | |
538 | for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) { | |
539 | if (cmsg->cmsg_level != SOL_SOCKET) | |
540 | continue; | |
541 | ||
542 | switch (cmsg->cmsg_type) { | |
487a3682 ML |
543 | case SCM_TIMESTAMPNS: |
544 | recv_time = (struct timespec *) CMSG_DATA(cmsg); | |
84e51726 LP |
545 | break; |
546 | } | |
547 | } | |
548 | if (!recv_time) { | |
549 | log_error("Invalid packet timestamp."); | |
550 | return -EINVAL; | |
551 | } | |
552 | ||
553 | if (!m->pending) { | |
554 | log_debug("Unexpected reply. Ignoring."); | |
555 | return 0; | |
556 | } | |
557 | ||
e8206972 ML |
558 | m->missed_replies = 0; |
559 | ||
84e51726 LP |
560 | /* check our "time cookie" (we just stored nanoseconds in the fraction field) */ |
561 | if (be32toh(ntpmsg.origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 || | |
562 | be32toh(ntpmsg.origin_time.frac) != m->trans_time.tv_nsec) { | |
563 | log_debug("Invalid reply; not our transmit time. Ignoring."); | |
564 | return 0; | |
565 | } | |
566 | ||
567 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
568 | ||
569 | if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 || | |
570 | be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) { | |
571 | log_debug("Invalid reply, returned times before epoch. Ignoring."); | |
572 | return manager_connect(m); | |
573 | } | |
574 | ||
07610e10 ML |
575 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC || |
576 | ntpmsg.stratum == 0 || ntpmsg.stratum >= 16) { | |
84e51726 LP |
577 | log_debug("Server is not synchronized. Disconnecting."); |
578 | return manager_connect(m); | |
579 | } | |
580 | ||
581 | if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) { | |
582 | log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field)); | |
583 | return manager_connect(m); | |
584 | } | |
585 | ||
586 | if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) { | |
587 | log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field)); | |
588 | return manager_connect(m); | |
589 | } | |
590 | ||
3af0442c ML |
591 | root_distance = ntp_ts_short_to_d(&ntpmsg.root_delay) / 2 + ntp_ts_short_to_d(&ntpmsg.root_dispersion); |
592 | if (root_distance > NTP_MAX_ROOT_DISTANCE) { | |
593 | log_debug("Server has too large root distance. Disconnecting."); | |
594 | return manager_connect(m); | |
595 | } | |
596 | ||
84e51726 LP |
597 | /* valid packet */ |
598 | m->pending = false; | |
84e51726 LP |
599 | |
600 | /* announce leap seconds */ | |
601 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) | |
602 | leap_sec = 1; | |
603 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) | |
604 | leap_sec = -1; | |
605 | else | |
606 | leap_sec = 0; | |
607 | ||
608 | /* | |
609 | * "Timestamp Name ID When Generated | |
610 | * ------------------------------------------------------------ | |
611 | * Originate Timestamp T1 time request sent by client | |
612 | * Receive Timestamp T2 time request received by server | |
613 | * Transmit Timestamp T3 time reply sent by server | |
614 | * Destination Timestamp T4 time reply received by client | |
615 | * | |
616 | * The round-trip delay, d, and system clock offset, t, are defined as: | |
617 | * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2" | |
618 | */ | |
73c76e63 | 619 | origin = ts_to_d(&m->trans_time) + OFFSET_1900_1970; |
84e51726 LP |
620 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
621 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
487a3682 | 622 | dest = ts_to_d(recv_time) + OFFSET_1900_1970; |
84e51726 LP |
623 | |
624 | offset = ((receive - origin) + (trans - dest)) / 2; | |
625 | delay = (dest - origin) - (trans - receive); | |
626 | ||
627 | spike = manager_sample_spike_detection(m, offset, delay); | |
628 | ||
629 | manager_adjust_poll(m, offset, spike); | |
630 | ||
631 | log_debug("NTP response:\n" | |
632 | " leap : %u\n" | |
633 | " version : %u\n" | |
634 | " mode : %u\n" | |
635 | " stratum : %u\n" | |
636 | " precision : %.6f sec (%d)\n" | |
3af0442c | 637 | " root distance: %.6f sec\n" |
84e51726 LP |
638 | " reference : %.4s\n" |
639 | " origin : %.3f\n" | |
640 | " receive : %.3f\n" | |
641 | " transmit : %.3f\n" | |
642 | " dest : %.3f\n" | |
643 | " offset : %+.3f sec\n" | |
644 | " delay : %+.3f sec\n" | |
645 | " packet count : %"PRIu64"\n" | |
646 | " jitter : %.3f%s\n" | |
647 | " poll interval: " USEC_FMT "\n", | |
648 | NTP_FIELD_LEAP(ntpmsg.field), | |
649 | NTP_FIELD_VERSION(ntpmsg.field), | |
650 | NTP_FIELD_MODE(ntpmsg.field), | |
651 | ntpmsg.stratum, | |
652 | exp2(ntpmsg.precision), ntpmsg.precision, | |
3af0442c | 653 | root_distance, |
84e51726 LP |
654 | ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a", |
655 | origin - OFFSET_1900_1970, | |
656 | receive - OFFSET_1900_1970, | |
657 | trans - OFFSET_1900_1970, | |
658 | dest - OFFSET_1900_1970, | |
659 | offset, delay, | |
660 | m->packet_count, | |
661 | m->samples_jitter, spike ? " spike" : "", | |
662 | m->poll_interval_usec / USEC_PER_SEC); | |
663 | ||
664 | if (!spike) { | |
665 | m->sync = true; | |
666 | r = manager_adjust_clock(m, offset, leap_sec); | |
667 | if (r < 0) | |
668 | log_error("Failed to call clock_adjtime(): %m"); | |
669 | } | |
670 | ||
671 | log_info("interval/delta/delay/jitter/drift " USEC_FMT "s/%+.3fs/%.3fs/%.3fs/%+ippm%s", | |
672 | m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_ppm, | |
673 | spike ? " (ignored)" : ""); | |
674 | ||
675 | r = manager_arm_timer(m, m->poll_interval_usec); | |
676 | if (r < 0) { | |
677 | log_error("Failed to rearm timer: %s", strerror(-r)); | |
678 | return r; | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | static int manager_listen_setup(Manager *m) { | |
685 | union sockaddr_union addr = {}; | |
686 | static const int tos = IPTOS_LOWDELAY; | |
687 | static const int on = 1; | |
688 | int r; | |
689 | ||
690 | assert(m); | |
691 | ||
692 | assert(m->server_socket < 0); | |
693 | assert(!m->event_receive); | |
694 | assert(m->current_server_address); | |
695 | ||
696 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; | |
697 | ||
698 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); | |
699 | if (m->server_socket < 0) | |
700 | return -errno; | |
701 | ||
702 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); | |
703 | if (r < 0) | |
704 | return -errno; | |
705 | ||
487a3682 | 706 | r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, &on, sizeof(on)); |
84e51726 LP |
707 | if (r < 0) |
708 | return -errno; | |
709 | ||
710 | setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); | |
711 | ||
712 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); | |
713 | } | |
714 | ||
715 | static int manager_begin(Manager *m) { | |
716 | _cleanup_free_ char *pretty = NULL; | |
717 | int r; | |
718 | ||
719 | assert(m); | |
720 | assert_return(m->current_server_name, -EHOSTUNREACH); | |
721 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
722 | ||
e8206972 | 723 | m->missed_replies = NTP_MAX_MISSED_REPLIES; |
80cd2606 KS |
724 | if (m->poll_interval_usec == 0) |
725 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
84e51726 LP |
726 | |
727 | server_address_pretty(m->current_server_address, &pretty); | |
728 | log_info("Using NTP server %s (%s).", strna(pretty), m->current_server_name->string); | |
729 | sd_notifyf(false, "STATUS=Using Time Server %s (%s).", strna(pretty), m->current_server_name->string); | |
730 | ||
731 | r = manager_listen_setup(m); | |
732 | if (r < 0) { | |
733 | log_warning("Failed to setup connection socket: %s", strerror(-r)); | |
734 | return r; | |
735 | } | |
736 | ||
737 | r = manager_clock_watch_setup(m); | |
738 | if (r < 0) | |
739 | return r; | |
740 | ||
741 | return manager_send_request(m); | |
742 | } | |
743 | ||
874ff7bf LP |
744 | void manager_set_server_name(Manager *m, ServerName *n) { |
745 | assert(m); | |
84e51726 | 746 | |
874ff7bf LP |
747 | if (m->current_server_name == n) |
748 | return; | |
84e51726 | 749 | |
874ff7bf LP |
750 | m->current_server_name = n; |
751 | m->current_server_address = NULL; | |
752 | ||
753 | manager_disconnect(m); | |
84e51726 | 754 | |
874ff7bf LP |
755 | if (n) |
756 | log_debug("Selected server %s.", n->string); | |
757 | } | |
84e51726 | 758 | |
874ff7bf | 759 | void manager_set_server_address(Manager *m, ServerAddress *a) { |
84e51726 LP |
760 | assert(m); |
761 | ||
874ff7bf LP |
762 | if (m->current_server_address == a) |
763 | return; | |
764 | ||
874ff7bf | 765 | m->current_server_address = a; |
20f8d3cf SN |
766 | /* If a is NULL, we are just clearing the address, without |
767 | * changing the name. Keep the existing name in that case. */ | |
768 | if (a) | |
769 | m->current_server_name = a->name; | |
874ff7bf LP |
770 | |
771 | manager_disconnect(m); | |
772 | ||
773 | if (a) { | |
774 | _cleanup_free_ char *pretty = NULL; | |
775 | server_address_pretty(a, &pretty); | |
776 | log_debug("Selected address %s of server %s.", strna(pretty), a->name->string); | |
84e51726 LP |
777 | } |
778 | } | |
779 | ||
780 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { | |
781 | Manager *m = userdata; | |
874ff7bf | 782 | int r; |
84e51726 LP |
783 | |
784 | assert(q); | |
785 | assert(m); | |
786 | assert(m->current_server_name); | |
787 | ||
788 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
789 | ||
790 | if (ret != 0) { | |
791 | log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); | |
792 | ||
793 | /* Try next host */ | |
794 | return manager_connect(m); | |
795 | } | |
796 | ||
84e51726 LP |
797 | for (; ai; ai = ai->ai_next) { |
798 | _cleanup_free_ char *pretty = NULL; | |
874ff7bf | 799 | ServerAddress *a; |
84e51726 LP |
800 | |
801 | assert(ai->ai_addr); | |
802 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
84e51726 LP |
803 | |
804 | if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) { | |
805 | log_warning("Unsuitable address protocol for %s", m->current_server_name->string); | |
806 | continue; | |
807 | } | |
808 | ||
874ff7bf LP |
809 | r = server_address_new(m->current_server_name, &a, (const union sockaddr_union*) ai->ai_addr, ai->ai_addrlen); |
810 | if (r < 0) { | |
811 | log_error("Failed to add server address: %s", strerror(-r)); | |
812 | return r; | |
813 | } | |
84e51726 | 814 | |
874ff7bf | 815 | server_address_pretty(a, &pretty); |
84e51726 LP |
816 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
817 | } | |
818 | ||
819 | if (!m->current_server_name->addresses) { | |
820 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
821 | ||
822 | /* Try next host */ | |
823 | return manager_connect(m); | |
824 | } | |
825 | ||
874ff7bf | 826 | manager_set_server_address(m, m->current_server_name->addresses); |
84e51726 LP |
827 | |
828 | return manager_begin(m); | |
829 | } | |
830 | ||
874ff7bf | 831 | static int manager_retry_connect(sd_event_source *source, usec_t usec, void *userdata) { |
84e51726 LP |
832 | Manager *m = userdata; |
833 | ||
834 | assert(m); | |
835 | ||
836 | return manager_connect(m); | |
837 | } | |
838 | ||
839 | int manager_connect(Manager *m) { | |
84e51726 LP |
840 | int r; |
841 | ||
842 | assert(m); | |
843 | ||
844 | manager_disconnect(m); | |
845 | ||
846 | m->event_retry = sd_event_source_unref(m->event_retry); | |
847 | if (!ratelimit_test(&m->ratelimit)) { | |
848 | log_debug("Slowing down attempts to contact servers."); | |
849 | ||
874ff7bf | 850 | 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); |
84e51726 LP |
851 | if (r < 0) { |
852 | log_error("Failed to create retry timer: %s", strerror(-r)); | |
853 | return r; | |
854 | } | |
855 | ||
856 | return 0; | |
857 | } | |
858 | ||
859 | /* If we already are operating on some address, switch to the | |
860 | * next one. */ | |
861 | if (m->current_server_address && m->current_server_address->addresses_next) | |
874ff7bf | 862 | manager_set_server_address(m, m->current_server_address->addresses_next); |
84e51726 | 863 | else { |
874ff7bf LP |
864 | struct addrinfo hints = { |
865 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, | |
866 | .ai_socktype = SOCK_DGRAM, | |
867 | }; | |
84e51726 | 868 | |
874ff7bf | 869 | /* Hmm, we are through all addresses, let's look for the next host instead */ |
84e51726 | 870 | if (m->current_server_name && m->current_server_name->names_next) |
874ff7bf | 871 | manager_set_server_name(m, m->current_server_name->names_next); |
84e51726 | 872 | else { |
874ff7bf | 873 | ServerName *f; |
63463bf0 | 874 | bool restart = true; |
874ff7bf LP |
875 | |
876 | /* Our current server name list is exhausted, | |
877 | * let's find the next one to iterate. First | |
878 | * we try the system list, then the link list. | |
879 | * After having processed the link list we | |
880 | * jump back to the system list. However, if | |
881 | * both lists are empty, we change to the | |
882 | * fallback list. */ | |
883 | if (!m->current_server_name || m->current_server_name->type == SERVER_LINK) { | |
884 | f = m->system_servers; | |
885 | if (!f) | |
886 | f = m->link_servers; | |
887 | } else { | |
888 | f = m->link_servers; | |
889 | if (!f) | |
890 | f = m->system_servers; | |
63463bf0 ML |
891 | else |
892 | restart = false; | |
874ff7bf LP |
893 | } |
894 | ||
895 | if (!f) | |
896 | f = m->fallback_servers; | |
897 | ||
898 | if (!f) { | |
899 | manager_set_server_name(m, NULL); | |
84e51726 LP |
900 | log_debug("No server found."); |
901 | return 0; | |
902 | } | |
903 | ||
63463bf0 ML |
904 | if (restart && !m->exhausted_servers && m->poll_interval_usec) { |
905 | log_debug("Waiting after exhausting servers."); | |
906 | 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); | |
907 | if (r < 0) { | |
908 | log_error("Failed to create retry timer: %s", strerror(-r)); | |
909 | return r; | |
910 | } | |
911 | ||
912 | m->exhausted_servers = true; | |
913 | ||
914 | /* Increase the polling interval */ | |
915 | if (m->poll_interval_usec < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) | |
916 | m->poll_interval_usec *= 2; | |
917 | ||
918 | return 0; | |
919 | } | |
920 | ||
921 | m->exhausted_servers = false; | |
922 | ||
874ff7bf | 923 | manager_set_server_name(m, f); |
84e51726 LP |
924 | } |
925 | ||
926 | /* Tell the resolver to reread /etc/resolv.conf, in | |
927 | * case it changed. */ | |
928 | res_init(); | |
929 | ||
874ff7bf LP |
930 | /* Flush out any previously resolved addresses */ |
931 | server_name_flush_addresses(m->current_server_name); | |
932 | ||
933 | log_debug("Resolving %s...", m->current_server_name->string); | |
934 | ||
84e51726 LP |
935 | r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m); |
936 | if (r < 0) { | |
937 | log_error("Failed to create resolver: %s", strerror(-r)); | |
938 | return r; | |
939 | } | |
940 | ||
941 | return 1; | |
942 | } | |
943 | ||
944 | r = manager_begin(m); | |
945 | if (r < 0) | |
946 | return r; | |
947 | ||
948 | return 1; | |
949 | } | |
950 | ||
84e51726 LP |
951 | void manager_disconnect(Manager *m) { |
952 | assert(m); | |
953 | ||
954 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
955 | ||
956 | m->event_timer = sd_event_source_unref(m->event_timer); | |
957 | ||
958 | m->event_receive = sd_event_source_unref(m->event_receive); | |
959 | m->server_socket = safe_close(m->server_socket); | |
960 | ||
961 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
962 | m->clock_watch_fd = safe_close(m->clock_watch_fd); | |
963 | ||
964 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
965 | ||
966 | sd_notifyf(false, "STATUS=Idle."); | |
967 | } | |
968 | ||
874ff7bf LP |
969 | void manager_flush_server_names(Manager *m, ServerType t) { |
970 | assert(m); | |
971 | ||
972 | if (t == SERVER_SYSTEM) | |
973 | while (m->system_servers) | |
974 | server_name_free(m->system_servers); | |
975 | ||
976 | if (t == SERVER_LINK) | |
977 | while (m->link_servers) | |
978 | server_name_free(m->link_servers); | |
979 | ||
980 | if (t == SERVER_FALLBACK) | |
981 | while (m->fallback_servers) | |
982 | server_name_free(m->fallback_servers); | |
983 | } | |
84e51726 LP |
984 | |
985 | void manager_free(Manager *m) { | |
986 | if (!m) | |
987 | return; | |
988 | ||
989 | manager_disconnect(m); | |
874ff7bf LP |
990 | manager_flush_server_names(m, SERVER_SYSTEM); |
991 | manager_flush_server_names(m, SERVER_LINK); | |
992 | manager_flush_server_names(m, SERVER_FALLBACK); | |
84e51726 LP |
993 | |
994 | sd_event_source_unref(m->event_retry); | |
995 | ||
996 | sd_event_source_unref(m->network_event_source); | |
997 | sd_network_monitor_unref(m->network_monitor); | |
998 | ||
999 | sd_resolve_unref(m->resolve); | |
1000 | sd_event_unref(m->event); | |
1001 | ||
1002 | free(m); | |
1003 | } | |
1004 | ||
874ff7bf LP |
1005 | static int manager_network_read_link_servers(Manager *m) { |
1006 | _cleanup_strv_free_ char **ntp = NULL; | |
1007 | ServerName *n, *nx; | |
1008 | char **i; | |
1009 | int r; | |
1010 | ||
84e51726 LP |
1011 | assert(m); |
1012 | ||
874ff7bf LP |
1013 | r = sd_network_get_ntp(&ntp); |
1014 | if (r < 0) | |
1015 | goto clear; | |
1016 | ||
1017 | LIST_FOREACH(names, n, m->link_servers) | |
1018 | n->marked = true; | |
1019 | ||
1020 | STRV_FOREACH(i, ntp) { | |
1021 | bool found = false; | |
1022 | ||
1023 | LIST_FOREACH(names, n, m->link_servers) | |
1024 | if (streq(n->string, *i)) { | |
1025 | n->marked = false; | |
1026 | found = true; | |
1027 | break; | |
1028 | } | |
1029 | ||
1030 | if (!found) { | |
1031 | r = server_name_new(m, NULL, SERVER_LINK, *i); | |
1032 | if (r < 0) | |
1033 | goto clear; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | LIST_FOREACH_SAFE(names, n, nx, m->link_servers) | |
1038 | if (n->marked) | |
1039 | server_name_free(n); | |
1040 | ||
1041 | return 0; | |
1042 | ||
1043 | clear: | |
1044 | manager_flush_server_names(m, SERVER_LINK); | |
1045 | return r; | |
84e51726 LP |
1046 | } |
1047 | ||
1048 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1049 | Manager *m = userdata; | |
1050 | bool connected, online; | |
1051 | int r; | |
1052 | ||
1053 | assert(m); | |
1054 | ||
1055 | sd_network_monitor_flush(m->network_monitor); | |
1056 | ||
874ff7bf LP |
1057 | manager_network_read_link_servers(m); |
1058 | ||
84e51726 LP |
1059 | /* check if the machine is online */ |
1060 | online = network_is_online(); | |
1061 | ||
1062 | /* check if the client is currently connected */ | |
63463bf0 | 1063 | connected = m->server_socket >= 0 || m->resolve_query || m->exhausted_servers; |
84e51726 LP |
1064 | |
1065 | if (connected && !online) { | |
1066 | log_info("No network connectivity, watching for changes."); | |
1067 | manager_disconnect(m); | |
1068 | ||
1069 | } else if (!connected && online) { | |
1070 | log_info("Network configuration changed, trying to establish connection."); | |
1071 | ||
1072 | if (m->current_server_address) | |
1073 | r = manager_begin(m); | |
1074 | else | |
1075 | r = manager_connect(m); | |
1076 | if (r < 0) | |
1077 | return r; | |
1078 | } | |
1079 | ||
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static int manager_network_monitor_listen(Manager *m) { | |
1084 | int r, fd, events; | |
1085 | ||
1086 | assert(m); | |
1087 | ||
1088 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
1089 | if (r < 0) | |
1090 | return r; | |
1091 | ||
1092 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
1093 | if (fd < 0) | |
1094 | return fd; | |
1095 | ||
1096 | events = sd_network_monitor_get_events(m->network_monitor); | |
1097 | if (events < 0) | |
1098 | return events; | |
1099 | ||
1100 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, manager_network_event_handler, m); | |
1101 | if (r < 0) | |
1102 | return r; | |
1103 | ||
1104 | return 0; | |
1105 | } | |
1106 | ||
1107 | int manager_new(Manager **ret) { | |
1108 | _cleanup_(manager_freep) Manager *m = NULL; | |
1109 | int r; | |
1110 | ||
1111 | assert(ret); | |
1112 | ||
1113 | m = new0(Manager, 1); | |
1114 | if (!m) | |
1115 | return -ENOMEM; | |
1116 | ||
1117 | m->server_socket = m->clock_watch_fd = -1; | |
1118 | ||
1119 | RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST); | |
1120 | ||
874ff7bf | 1121 | r = manager_parse_server_string(m, SERVER_FALLBACK, NTP_SERVERS); |
84e51726 LP |
1122 | if (r < 0) |
1123 | return r; | |
1124 | ||
1125 | r = sd_event_default(&m->event); | |
1126 | if (r < 0) | |
1127 | return r; | |
1128 | ||
1129 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
1130 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
1131 | ||
1132 | sd_event_set_watchdog(m->event, true); | |
1133 | ||
1134 | r = sd_resolve_default(&m->resolve); | |
1135 | if (r < 0) | |
1136 | return r; | |
1137 | ||
1138 | r = sd_resolve_attach_event(m->resolve, m->event, 0); | |
1139 | if (r < 0) | |
1140 | return r; | |
1141 | ||
1142 | r = manager_network_monitor_listen(m); | |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | ||
c572db3c | 1146 | manager_network_read_link_servers(m); |
874ff7bf | 1147 | |
84e51726 LP |
1148 | *ret = m; |
1149 | m = NULL; | |
1150 | ||
1151 | return 0; | |
1152 | } |