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84e51726 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Kay Sievers, Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
84e51726 | 20 | #include <errno.h> |
84e51726 | 21 | #include <math.h> |
84e51726 LP |
22 | #include <netinet/in.h> |
23 | #include <netinet/ip.h> | |
07630cea LP |
24 | #include <resolv.h> |
25 | #include <stdlib.h> | |
26 | #include <sys/socket.h> | |
84e51726 LP |
27 | #include <sys/timerfd.h> |
28 | #include <sys/timex.h> | |
84e51726 | 29 | #include <sys/types.h> |
07630cea LP |
30 | #include <time.h> |
31 | ||
32 | #include "sd-daemon.h" | |
84e51726 | 33 | |
b5efdb8a | 34 | #include "alloc-util.h" |
3ffd4af2 | 35 | #include "fd-util.h" |
f4f15635 | 36 | #include "fs-util.h" |
84e51726 | 37 | #include "list.h" |
07630cea LP |
38 | #include "log.h" |
39 | #include "missing.h" | |
40 | #include "network-util.h" | |
84e51726 | 41 | #include "ratelimit.h" |
07630cea LP |
42 | #include "socket-util.h" |
43 | #include "sparse-endian.h" | |
44 | #include "string-util.h" | |
84e51726 | 45 | #include "strv.h" |
07630cea | 46 | #include "time-util.h" |
84e51726 LP |
47 | #include "timesyncd-conf.h" |
48 | #include "timesyncd-manager.h" | |
3ffd4af2 | 49 | #include "util.h" |
84e51726 LP |
50 | |
51 | #ifndef ADJ_SETOFFSET | |
52 | #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */ | |
53 | #endif | |
54 | ||
55 | /* expected accuracy of time synchronization; used to adjust the poll interval */ | |
56 | #define NTP_ACCURACY_SEC 0.2 | |
57 | ||
58 | /* | |
59 | * "A client MUST NOT under any conditions use a poll interval less | |
60 | * than 15 seconds." | |
61 | */ | |
62 | #define NTP_POLL_INTERVAL_MIN_SEC 32 | |
63 | #define NTP_POLL_INTERVAL_MAX_SEC 2048 | |
64 | ||
65 | /* | |
66 | * Maximum delta in seconds which the system clock is gradually adjusted | |
67 | * (slew) to approach the network time. Deltas larger that this are set by | |
68 | * letting the system time jump. The kernel's limit for adjtime is 0.5s. | |
69 | */ | |
70 | #define NTP_MAX_ADJUST 0.4 | |
71 | ||
72 | /* NTP protocol, packet header */ | |
73 | #define NTP_LEAP_PLUSSEC 1 | |
74 | #define NTP_LEAP_MINUSSEC 2 | |
75 | #define NTP_LEAP_NOTINSYNC 3 | |
76 | #define NTP_MODE_CLIENT 3 | |
77 | #define NTP_MODE_SERVER 4 | |
78 | #define NTP_FIELD_LEAP(f) (((f) >> 6) & 3) | |
79 | #define NTP_FIELD_VERSION(f) (((f) >> 3) & 7) | |
80 | #define NTP_FIELD_MODE(f) ((f) & 7) | |
81 | #define NTP_FIELD(l, v, m) (((l) << 6) | ((v) << 3) | (m)) | |
82 | ||
3af0442c ML |
83 | /* Maximum acceptable root distance in seconds. */ |
84 | #define NTP_MAX_ROOT_DISTANCE 5.0 | |
85 | ||
e8206972 ML |
86 | /* Maximum number of missed replies before selecting another source. */ |
87 | #define NTP_MAX_MISSED_REPLIES 2 | |
88 | ||
84e51726 LP |
89 | /* |
90 | * "NTP timestamps are represented as a 64-bit unsigned fixed-point number, | |
91 | * in seconds relative to 0h on 1 January 1900." | |
92 | */ | |
625b3b71 | 93 | #define OFFSET_1900_1970 UINT64_C(2208988800) |
84e51726 LP |
94 | |
95 | #define RETRY_USEC (30*USEC_PER_SEC) | |
96 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) | |
97 | #define RATELIMIT_BURST 10 | |
98 | ||
99 | #define TIMEOUT_USEC (10*USEC_PER_SEC) | |
100 | ||
101 | struct ntp_ts { | |
102 | be32_t sec; | |
103 | be32_t frac; | |
104 | } _packed_; | |
105 | ||
106 | struct ntp_ts_short { | |
107 | be16_t sec; | |
108 | be16_t frac; | |
109 | } _packed_; | |
110 | ||
111 | struct ntp_msg { | |
112 | uint8_t field; | |
113 | uint8_t stratum; | |
114 | int8_t poll; | |
115 | int8_t precision; | |
116 | struct ntp_ts_short root_delay; | |
117 | struct ntp_ts_short root_dispersion; | |
118 | char refid[4]; | |
119 | struct ntp_ts reference_time; | |
120 | struct ntp_ts origin_time; | |
121 | struct ntp_ts recv_time; | |
122 | struct ntp_ts trans_time; | |
123 | } _packed_; | |
124 | ||
125 | static int manager_arm_timer(Manager *m, usec_t next); | |
126 | static int manager_clock_watch_setup(Manager *m); | |
7b628891 | 127 | static int manager_listen_setup(Manager *m); |
f89c4e15 | 128 | static void manager_listen_stop(Manager *m); |
84e51726 | 129 | |
3af0442c ML |
130 | static double ntp_ts_short_to_d(const struct ntp_ts_short *ts) { |
131 | return be16toh(ts->sec) + (be16toh(ts->frac) / 65536.0); | |
132 | } | |
133 | ||
84e51726 LP |
134 | static double ntp_ts_to_d(const struct ntp_ts *ts) { |
135 | return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX); | |
136 | } | |
137 | ||
138 | static double ts_to_d(const struct timespec *ts) { | |
139 | return ts->tv_sec + (1.0e-9 * ts->tv_nsec); | |
140 | } | |
141 | ||
84e51726 LP |
142 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { |
143 | _cleanup_free_ char *pretty = NULL; | |
144 | Manager *m = userdata; | |
145 | ||
146 | assert(m); | |
147 | assert(m->current_server_name); | |
148 | assert(m->current_server_address); | |
149 | ||
150 | server_address_pretty(m->current_server_address, &pretty); | |
151 | log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string); | |
152 | ||
153 | return manager_connect(m); | |
154 | } | |
155 | ||
156 | static int manager_send_request(Manager *m) { | |
157 | _cleanup_free_ char *pretty = NULL; | |
158 | struct ntp_msg ntpmsg = { | |
159 | /* | |
160 | * "The client initializes the NTP message header, sends the request | |
161 | * to the server, and strips the time of day from the Transmit | |
162 | * Timestamp field of the reply. For this purpose, all the NTP | |
163 | * header fields are set to 0, except the Mode, VN, and optional | |
164 | * Transmit Timestamp fields." | |
165 | */ | |
166 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
167 | }; | |
168 | ssize_t len; | |
169 | int r; | |
170 | ||
171 | assert(m); | |
172 | assert(m->current_server_name); | |
173 | assert(m->current_server_address); | |
174 | ||
175 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
176 | ||
f89c4e15 LP |
177 | r = manager_listen_setup(m); |
178 | if (r < 0) | |
179 | return log_warning_errno(r, "Failed to setup connection socket: %m"); | |
7b628891 | 180 | |
84e51726 LP |
181 | /* |
182 | * Set transmit timestamp, remember it; the server will send that back | |
183 | * as the origin timestamp and we have an indication that this is the | |
184 | * matching answer to our request. | |
185 | * | |
186 | * The actual value does not matter, We do not care about the correct | |
187 | * NTP UINT_MAX fraction; we just pass the plain nanosecond value. | |
188 | */ | |
189 | assert_se(clock_gettime(clock_boottime_or_monotonic(), &m->trans_time_mon) >= 0); | |
190 | assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0); | |
191 | ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970); | |
192 | ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec); | |
193 | ||
194 | server_address_pretty(m->current_server_address, &pretty); | |
195 | ||
196 | len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen); | |
197 | if (len == sizeof(ntpmsg)) { | |
198 | m->pending = true; | |
199 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); | |
200 | } else { | |
56f64d95 | 201 | log_debug_errno(errno, "Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); |
84e51726 LP |
202 | return manager_connect(m); |
203 | } | |
204 | ||
ab4df227 KS |
205 | /* re-arm timer with increasing timeout, in case the packets never arrive back */ |
206 | if (m->retry_interval > 0) { | |
207 | if (m->retry_interval < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) | |
208 | m->retry_interval *= 2; | |
209 | } else | |
210 | m->retry_interval = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
211 | ||
212 | r = manager_arm_timer(m, m->retry_interval); | |
f647962d MS |
213 | if (r < 0) |
214 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
ab4df227 | 215 | |
e8206972 ML |
216 | m->missed_replies++; |
217 | if (m->missed_replies > NTP_MAX_MISSED_REPLIES) { | |
218 | r = sd_event_add_time( | |
219 | m->event, | |
220 | &m->event_timeout, | |
221 | clock_boottime_or_monotonic(), | |
222 | now(clock_boottime_or_monotonic()) + TIMEOUT_USEC, 0, | |
223 | manager_timeout, m); | |
f647962d MS |
224 | if (r < 0) |
225 | return log_error_errno(r, "Failed to arm timeout timer: %m"); | |
84e51726 LP |
226 | } |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
232 | Manager *m = userdata; | |
233 | ||
234 | assert(m); | |
235 | ||
236 | return manager_send_request(m); | |
237 | } | |
238 | ||
239 | static int manager_arm_timer(Manager *m, usec_t next) { | |
240 | int r; | |
241 | ||
242 | assert(m); | |
84e51726 LP |
243 | |
244 | if (next == 0) { | |
245 | m->event_timer = sd_event_source_unref(m->event_timer); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | if (m->event_timer) { | |
250 | r = sd_event_source_set_time(m->event_timer, now(clock_boottime_or_monotonic()) + next); | |
251 | if (r < 0) | |
252 | return r; | |
253 | ||
254 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); | |
255 | } | |
256 | ||
257 | return sd_event_add_time( | |
258 | m->event, | |
259 | &m->event_timer, | |
260 | clock_boottime_or_monotonic(), | |
261 | now(clock_boottime_or_monotonic()) + next, 0, | |
262 | manager_timer, m); | |
263 | } | |
264 | ||
265 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
266 | Manager *m = userdata; | |
267 | ||
268 | assert(m); | |
269 | ||
270 | /* rearm timer */ | |
271 | manager_clock_watch_setup(m); | |
272 | ||
273 | /* skip our own jumps */ | |
274 | if (m->jumped) { | |
275 | m->jumped = false; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | /* resync */ | |
7e3254b3 | 280 | log_debug("System time changed. Resyncing."); |
84e51726 LP |
281 | m->poll_resync = true; |
282 | ||
283 | return manager_send_request(m); | |
284 | } | |
285 | ||
286 | /* wake up when the system time changes underneath us */ | |
287 | static int manager_clock_watch_setup(Manager *m) { | |
288 | ||
289 | struct itimerspec its = { | |
290 | .it_value.tv_sec = TIME_T_MAX | |
291 | }; | |
292 | ||
293 | int r; | |
294 | ||
295 | assert(m); | |
296 | ||
297 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
298 | safe_close(m->clock_watch_fd); | |
299 | ||
300 | m->clock_watch_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC); | |
4a62c710 MS |
301 | if (m->clock_watch_fd < 0) |
302 | return log_error_errno(errno, "Failed to create timerfd: %m"); | |
84e51726 | 303 | |
4a62c710 MS |
304 | if (timerfd_settime(m->clock_watch_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) |
305 | return log_error_errno(errno, "Failed to set up timerfd: %m"); | |
84e51726 LP |
306 | |
307 | r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m); | |
f647962d MS |
308 | if (r < 0) |
309 | return log_error_errno(r, "Failed to create clock watch event source: %m"); | |
84e51726 LP |
310 | |
311 | return 0; | |
312 | } | |
313 | ||
314 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { | |
315 | struct timex tmx = {}; | |
316 | int r; | |
317 | ||
318 | assert(m); | |
319 | ||
320 | /* | |
321 | * For small deltas, tell the kernel to gradually adjust the system | |
322 | * clock to the NTP time, larger deltas are just directly set. | |
323 | */ | |
324 | if (fabs(offset) < NTP_MAX_ADJUST) { | |
325 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR; | |
326 | tmx.status = STA_PLL; | |
327 | tmx.offset = offset * NSEC_PER_SEC; | |
328 | tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4; | |
329 | tmx.maxerror = 0; | |
330 | tmx.esterror = 0; | |
ff49bc32 | 331 | log_debug(" adjust (slew): %+.3f sec", offset); |
84e51726 LP |
332 | } else { |
333 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_SETOFFSET; | |
334 | ||
335 | /* ADJ_NANO uses nanoseconds in the microseconds field */ | |
336 | tmx.time.tv_sec = (long)offset; | |
337 | tmx.time.tv_usec = (offset - tmx.time.tv_sec) * NSEC_PER_SEC; | |
338 | ||
339 | /* the kernel expects -0.3s as {-1, 7000.000.000} */ | |
340 | if (tmx.time.tv_usec < 0) { | |
341 | tmx.time.tv_sec -= 1; | |
342 | tmx.time.tv_usec += NSEC_PER_SEC; | |
343 | } | |
344 | ||
345 | m->jumped = true; | |
ff49bc32 | 346 | log_debug(" adjust (jump): %+.3f sec", offset); |
84e51726 LP |
347 | } |
348 | ||
349 | /* | |
350 | * An unset STA_UNSYNC will enable the kernel's 11-minute mode, | |
351 | * which syncs the system time periodically to the RTC. | |
352 | * | |
353 | * In case the RTC runs in local time, never touch the RTC, | |
354 | * we have no way to properly handle daylight saving changes and | |
355 | * mobile devices moving between time zones. | |
356 | */ | |
357 | if (m->rtc_local_time) | |
358 | tmx.status |= STA_UNSYNC; | |
359 | ||
360 | switch (leap_sec) { | |
361 | case 1: | |
362 | tmx.status |= STA_INS; | |
363 | break; | |
364 | case -1: | |
365 | tmx.status |= STA_DEL; | |
366 | break; | |
367 | } | |
368 | ||
369 | r = clock_adjtime(CLOCK_REALTIME, &tmx); | |
370 | if (r < 0) | |
6ff6f4d8 | 371 | return -errno; |
84e51726 | 372 | |
baa33e79 ZJS |
373 | /* If touch fails, there isn't much we can do. Maybe it'll work next time. */ |
374 | (void) touch("/var/lib/systemd/clock"); | |
84e51726 LP |
375 | |
376 | m->drift_ppm = tmx.freq / 65536; | |
377 | ||
378 | log_debug(" status : %04i %s\n" | |
70887c5f | 379 | " time now : %li.%03"PRI_USEC"\n" |
84e51726 LP |
380 | " constant : %li\n" |
381 | " offset : %+.3f sec\n" | |
382 | " freq offset : %+li (%i ppm)\n", | |
383 | tmx.status, tmx.status & STA_UNSYNC ? "unsync" : "sync", | |
70887c5f | 384 | tmx.time.tv_sec, tmx.time.tv_usec / NSEC_PER_MSEC, |
84e51726 LP |
385 | tmx.constant, |
386 | (double)tmx.offset / NSEC_PER_SEC, | |
387 | tmx.freq, m->drift_ppm); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { | |
393 | unsigned int i, idx_cur, idx_new, idx_min; | |
394 | double jitter; | |
395 | double j; | |
396 | ||
397 | assert(m); | |
398 | ||
399 | m->packet_count++; | |
400 | ||
401 | /* ignore initial sample */ | |
402 | if (m->packet_count == 1) | |
403 | return false; | |
404 | ||
405 | /* store the current data in our samples array */ | |
406 | idx_cur = m->samples_idx; | |
407 | idx_new = (idx_cur + 1) % ELEMENTSOF(m->samples); | |
408 | m->samples_idx = idx_new; | |
409 | m->samples[idx_new].offset = offset; | |
410 | m->samples[idx_new].delay = delay; | |
411 | ||
412 | /* calculate new jitter value from the RMS differences relative to the lowest delay sample */ | |
413 | jitter = m->samples_jitter; | |
414 | for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(m->samples); i++) | |
415 | if (m->samples[i].delay > 0 && m->samples[i].delay < m->samples[idx_min].delay) | |
416 | idx_min = i; | |
417 | ||
418 | j = 0; | |
419 | for (i = 0; i < ELEMENTSOF(m->samples); i++) | |
fa66b606 | 420 | j += pow(m->samples[i].offset - m->samples[idx_min].offset, 2); |
84e51726 LP |
421 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); |
422 | ||
423 | /* ignore samples when resyncing */ | |
424 | if (m->poll_resync) | |
425 | return false; | |
426 | ||
427 | /* always accept offset if we are farther off than the round-trip delay */ | |
428 | if (fabs(offset) > delay) | |
429 | return false; | |
430 | ||
431 | /* we need a few samples before looking at them */ | |
432 | if (m->packet_count < 4) | |
433 | return false; | |
434 | ||
435 | /* do not accept anything worse than the maximum possible error of the best sample */ | |
436 | if (fabs(offset) > m->samples[idx_min].delay) | |
437 | return true; | |
438 | ||
439 | /* compare the difference between the current offset to the previous offset and jitter */ | |
440 | return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter; | |
441 | } | |
442 | ||
443 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { | |
444 | assert(m); | |
445 | ||
446 | if (m->poll_resync) { | |
447 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
448 | m->poll_resync = false; | |
449 | return; | |
450 | } | |
451 | ||
452 | /* set to minimal poll interval */ | |
453 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { | |
454 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
455 | return; | |
456 | } | |
457 | ||
458 | /* increase polling interval */ | |
459 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { | |
460 | if (m->poll_interval_usec < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) | |
461 | m->poll_interval_usec *= 2; | |
462 | return; | |
463 | } | |
464 | ||
465 | /* decrease polling interval */ | |
466 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { | |
467 | if (m->poll_interval_usec > NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC) | |
468 | m->poll_interval_usec /= 2; | |
469 | return; | |
470 | } | |
471 | } | |
472 | ||
473 | static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
474 | Manager *m = userdata; | |
475 | struct ntp_msg ntpmsg; | |
476 | ||
477 | struct iovec iov = { | |
478 | .iov_base = &ntpmsg, | |
479 | .iov_len = sizeof(ntpmsg), | |
480 | }; | |
481 | union { | |
482 | struct cmsghdr cmsghdr; | |
483 | uint8_t buf[CMSG_SPACE(sizeof(struct timeval))]; | |
484 | } control; | |
485 | union sockaddr_union server_addr; | |
486 | struct msghdr msghdr = { | |
487 | .msg_iov = &iov, | |
488 | .msg_iovlen = 1, | |
489 | .msg_control = &control, | |
490 | .msg_controllen = sizeof(control), | |
491 | .msg_name = &server_addr, | |
492 | .msg_namelen = sizeof(server_addr), | |
493 | }; | |
494 | struct cmsghdr *cmsg; | |
487a3682 | 495 | struct timespec *recv_time; |
84e51726 LP |
496 | ssize_t len; |
497 | double origin, receive, trans, dest; | |
498 | double delay, offset; | |
3af0442c | 499 | double root_distance; |
84e51726 LP |
500 | bool spike; |
501 | int leap_sec; | |
502 | int r; | |
503 | ||
504 | assert(source); | |
505 | assert(m); | |
506 | ||
507 | if (revents & (EPOLLHUP|EPOLLERR)) { | |
508 | log_warning("Server connection returned error."); | |
509 | return manager_connect(m); | |
510 | } | |
511 | ||
a38d9945 | 512 | len = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
84e51726 LP |
513 | if (len < 0) { |
514 | if (errno == EAGAIN) | |
515 | return 0; | |
516 | ||
517 | log_warning("Error receiving message. Disconnecting."); | |
518 | return manager_connect(m); | |
519 | } | |
520 | ||
43fcd650 TM |
521 | /* Too short or too long packet? */ |
522 | if (iov.iov_len < sizeof(struct ntp_msg) || (msghdr.msg_flags & MSG_TRUNC)) { | |
84e51726 LP |
523 | log_warning("Invalid response from server. Disconnecting."); |
524 | return manager_connect(m); | |
525 | } | |
526 | ||
527 | if (!m->current_server_name || | |
528 | !m->current_server_address || | |
529 | !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) { | |
530 | log_debug("Response from unknown server."); | |
531 | return 0; | |
532 | } | |
533 | ||
534 | recv_time = NULL; | |
2a1288ff | 535 | CMSG_FOREACH(cmsg, &msghdr) { |
84e51726 LP |
536 | if (cmsg->cmsg_level != SOL_SOCKET) |
537 | continue; | |
538 | ||
539 | switch (cmsg->cmsg_type) { | |
487a3682 ML |
540 | case SCM_TIMESTAMPNS: |
541 | recv_time = (struct timespec *) CMSG_DATA(cmsg); | |
84e51726 LP |
542 | break; |
543 | } | |
544 | } | |
545 | if (!recv_time) { | |
546 | log_error("Invalid packet timestamp."); | |
547 | return -EINVAL; | |
548 | } | |
549 | ||
550 | if (!m->pending) { | |
551 | log_debug("Unexpected reply. Ignoring."); | |
552 | return 0; | |
553 | } | |
554 | ||
e8206972 ML |
555 | m->missed_replies = 0; |
556 | ||
84e51726 LP |
557 | /* check our "time cookie" (we just stored nanoseconds in the fraction field) */ |
558 | if (be32toh(ntpmsg.origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 || | |
559 | be32toh(ntpmsg.origin_time.frac) != m->trans_time.tv_nsec) { | |
560 | log_debug("Invalid reply; not our transmit time. Ignoring."); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
565 | ||
566 | if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 || | |
567 | be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) { | |
568 | log_debug("Invalid reply, returned times before epoch. Ignoring."); | |
569 | return manager_connect(m); | |
570 | } | |
571 | ||
07610e10 ML |
572 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC || |
573 | ntpmsg.stratum == 0 || ntpmsg.stratum >= 16) { | |
84e51726 LP |
574 | log_debug("Server is not synchronized. Disconnecting."); |
575 | return manager_connect(m); | |
576 | } | |
577 | ||
578 | if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) { | |
579 | log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field)); | |
580 | return manager_connect(m); | |
581 | } | |
582 | ||
583 | if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) { | |
584 | log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field)); | |
585 | return manager_connect(m); | |
586 | } | |
587 | ||
3af0442c ML |
588 | root_distance = ntp_ts_short_to_d(&ntpmsg.root_delay) / 2 + ntp_ts_short_to_d(&ntpmsg.root_dispersion); |
589 | if (root_distance > NTP_MAX_ROOT_DISTANCE) { | |
590 | log_debug("Server has too large root distance. Disconnecting."); | |
591 | return manager_connect(m); | |
592 | } | |
593 | ||
84e51726 LP |
594 | /* valid packet */ |
595 | m->pending = false; | |
ab4df227 | 596 | m->retry_interval = 0; |
84e51726 | 597 | |
7b628891 | 598 | /* Stop listening */ |
f89c4e15 | 599 | manager_listen_stop(m); |
7b628891 | 600 | |
84e51726 LP |
601 | /* announce leap seconds */ |
602 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) | |
603 | leap_sec = 1; | |
604 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) | |
605 | leap_sec = -1; | |
606 | else | |
607 | leap_sec = 0; | |
608 | ||
609 | /* | |
610 | * "Timestamp Name ID When Generated | |
611 | * ------------------------------------------------------------ | |
612 | * Originate Timestamp T1 time request sent by client | |
613 | * Receive Timestamp T2 time request received by server | |
614 | * Transmit Timestamp T3 time reply sent by server | |
615 | * Destination Timestamp T4 time reply received by client | |
616 | * | |
617 | * The round-trip delay, d, and system clock offset, t, are defined as: | |
618 | * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2" | |
619 | */ | |
73c76e63 | 620 | origin = ts_to_d(&m->trans_time) + OFFSET_1900_1970; |
84e51726 LP |
621 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
622 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
487a3682 | 623 | dest = ts_to_d(recv_time) + OFFSET_1900_1970; |
84e51726 LP |
624 | |
625 | offset = ((receive - origin) + (trans - dest)) / 2; | |
626 | delay = (dest - origin) - (trans - receive); | |
627 | ||
628 | spike = manager_sample_spike_detection(m, offset, delay); | |
629 | ||
630 | manager_adjust_poll(m, offset, spike); | |
631 | ||
632 | log_debug("NTP response:\n" | |
633 | " leap : %u\n" | |
634 | " version : %u\n" | |
635 | " mode : %u\n" | |
636 | " stratum : %u\n" | |
637 | " precision : %.6f sec (%d)\n" | |
3af0442c | 638 | " root distance: %.6f sec\n" |
84e51726 LP |
639 | " reference : %.4s\n" |
640 | " origin : %.3f\n" | |
641 | " receive : %.3f\n" | |
642 | " transmit : %.3f\n" | |
643 | " dest : %.3f\n" | |
644 | " offset : %+.3f sec\n" | |
645 | " delay : %+.3f sec\n" | |
646 | " packet count : %"PRIu64"\n" | |
647 | " jitter : %.3f%s\n" | |
648 | " poll interval: " USEC_FMT "\n", | |
649 | NTP_FIELD_LEAP(ntpmsg.field), | |
650 | NTP_FIELD_VERSION(ntpmsg.field), | |
651 | NTP_FIELD_MODE(ntpmsg.field), | |
652 | ntpmsg.stratum, | |
653 | exp2(ntpmsg.precision), ntpmsg.precision, | |
3af0442c | 654 | root_distance, |
84e51726 LP |
655 | ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a", |
656 | origin - OFFSET_1900_1970, | |
657 | receive - OFFSET_1900_1970, | |
658 | trans - OFFSET_1900_1970, | |
659 | dest - OFFSET_1900_1970, | |
660 | offset, delay, | |
661 | m->packet_count, | |
662 | m->samples_jitter, spike ? " spike" : "", | |
663 | m->poll_interval_usec / USEC_PER_SEC); | |
664 | ||
665 | if (!spike) { | |
666 | m->sync = true; | |
667 | r = manager_adjust_clock(m, offset, leap_sec); | |
668 | if (r < 0) | |
6ff6f4d8 | 669 | log_error_errno(r, "Failed to call clock_adjtime(): %m"); |
84e51726 LP |
670 | } |
671 | ||
7b5b3fc3 LP |
672 | log_debug("interval/delta/delay/jitter/drift " USEC_FMT "s/%+.3fs/%.3fs/%.3fs/%+ippm%s", |
673 | m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_ppm, | |
674 | spike ? " (ignored)" : ""); | |
84e51726 | 675 | |
481b3f9e LP |
676 | if (!m->good) { |
677 | _cleanup_free_ char *pretty = NULL; | |
678 | ||
679 | m->good = true; | |
680 | ||
681 | server_address_pretty(m->current_server_address, &pretty); | |
682 | log_info("Synchronized to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
683 | sd_notifyf(false, "STATUS=Synchronized to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
684 | } | |
685 | ||
84e51726 | 686 | r = manager_arm_timer(m, m->poll_interval_usec); |
f647962d MS |
687 | if (r < 0) |
688 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
84e51726 LP |
689 | |
690 | return 0; | |
691 | } | |
692 | ||
693 | static int manager_listen_setup(Manager *m) { | |
694 | union sockaddr_union addr = {}; | |
695 | static const int tos = IPTOS_LOWDELAY; | |
696 | static const int on = 1; | |
697 | int r; | |
698 | ||
699 | assert(m); | |
700 | ||
f89c4e15 LP |
701 | if (m->server_socket >= 0) |
702 | return 0; | |
703 | ||
84e51726 LP |
704 | assert(!m->event_receive); |
705 | assert(m->current_server_address); | |
706 | ||
707 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; | |
708 | ||
709 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); | |
710 | if (m->server_socket < 0) | |
711 | return -errno; | |
712 | ||
713 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); | |
714 | if (r < 0) | |
715 | return -errno; | |
716 | ||
487a3682 | 717 | r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, &on, sizeof(on)); |
84e51726 LP |
718 | if (r < 0) |
719 | return -errno; | |
720 | ||
69f00817 | 721 | (void) setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
84e51726 LP |
722 | |
723 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); | |
724 | } | |
725 | ||
f89c4e15 LP |
726 | static void manager_listen_stop(Manager *m) { |
727 | assert(m); | |
728 | ||
729 | m->event_receive = sd_event_source_unref(m->event_receive); | |
730 | m->server_socket = safe_close(m->server_socket); | |
731 | } | |
732 | ||
84e51726 LP |
733 | static int manager_begin(Manager *m) { |
734 | _cleanup_free_ char *pretty = NULL; | |
735 | int r; | |
736 | ||
737 | assert(m); | |
738 | assert_return(m->current_server_name, -EHOSTUNREACH); | |
739 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
740 | ||
481b3f9e | 741 | m->good = false; |
e8206972 | 742 | m->missed_replies = NTP_MAX_MISSED_REPLIES; |
80cd2606 KS |
743 | if (m->poll_interval_usec == 0) |
744 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
84e51726 LP |
745 | |
746 | server_address_pretty(m->current_server_address, &pretty); | |
481b3f9e LP |
747 | log_debug("Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); |
748 | sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
84e51726 | 749 | |
84e51726 LP |
750 | r = manager_clock_watch_setup(m); |
751 | if (r < 0) | |
752 | return r; | |
753 | ||
754 | return manager_send_request(m); | |
755 | } | |
756 | ||
874ff7bf LP |
757 | void manager_set_server_name(Manager *m, ServerName *n) { |
758 | assert(m); | |
84e51726 | 759 | |
874ff7bf LP |
760 | if (m->current_server_name == n) |
761 | return; | |
84e51726 | 762 | |
874ff7bf LP |
763 | m->current_server_name = n; |
764 | m->current_server_address = NULL; | |
765 | ||
766 | manager_disconnect(m); | |
84e51726 | 767 | |
874ff7bf LP |
768 | if (n) |
769 | log_debug("Selected server %s.", n->string); | |
770 | } | |
84e51726 | 771 | |
874ff7bf | 772 | void manager_set_server_address(Manager *m, ServerAddress *a) { |
84e51726 LP |
773 | assert(m); |
774 | ||
874ff7bf LP |
775 | if (m->current_server_address == a) |
776 | return; | |
777 | ||
874ff7bf | 778 | m->current_server_address = a; |
20f8d3cf SN |
779 | /* If a is NULL, we are just clearing the address, without |
780 | * changing the name. Keep the existing name in that case. */ | |
781 | if (a) | |
782 | m->current_server_name = a->name; | |
874ff7bf LP |
783 | |
784 | manager_disconnect(m); | |
785 | ||
786 | if (a) { | |
787 | _cleanup_free_ char *pretty = NULL; | |
788 | server_address_pretty(a, &pretty); | |
789 | log_debug("Selected address %s of server %s.", strna(pretty), a->name->string); | |
84e51726 LP |
790 | } |
791 | } | |
792 | ||
793 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { | |
794 | Manager *m = userdata; | |
874ff7bf | 795 | int r; |
84e51726 LP |
796 | |
797 | assert(q); | |
798 | assert(m); | |
799 | assert(m->current_server_name); | |
800 | ||
801 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
802 | ||
803 | if (ret != 0) { | |
804 | log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); | |
805 | ||
806 | /* Try next host */ | |
807 | return manager_connect(m); | |
808 | } | |
809 | ||
84e51726 LP |
810 | for (; ai; ai = ai->ai_next) { |
811 | _cleanup_free_ char *pretty = NULL; | |
874ff7bf | 812 | ServerAddress *a; |
84e51726 LP |
813 | |
814 | assert(ai->ai_addr); | |
815 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
84e51726 LP |
816 | |
817 | if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) { | |
818 | log_warning("Unsuitable address protocol for %s", m->current_server_name->string); | |
819 | continue; | |
820 | } | |
821 | ||
874ff7bf | 822 | r = server_address_new(m->current_server_name, &a, (const union sockaddr_union*) ai->ai_addr, ai->ai_addrlen); |
f647962d MS |
823 | if (r < 0) |
824 | return log_error_errno(r, "Failed to add server address: %m"); | |
84e51726 | 825 | |
874ff7bf | 826 | server_address_pretty(a, &pretty); |
84e51726 LP |
827 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
828 | } | |
829 | ||
830 | if (!m->current_server_name->addresses) { | |
831 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
832 | ||
833 | /* Try next host */ | |
834 | return manager_connect(m); | |
835 | } | |
836 | ||
874ff7bf | 837 | manager_set_server_address(m, m->current_server_name->addresses); |
84e51726 LP |
838 | |
839 | return manager_begin(m); | |
840 | } | |
841 | ||
874ff7bf | 842 | static int manager_retry_connect(sd_event_source *source, usec_t usec, void *userdata) { |
84e51726 LP |
843 | Manager *m = userdata; |
844 | ||
845 | assert(m); | |
846 | ||
847 | return manager_connect(m); | |
848 | } | |
849 | ||
850 | int manager_connect(Manager *m) { | |
84e51726 LP |
851 | int r; |
852 | ||
853 | assert(m); | |
854 | ||
855 | manager_disconnect(m); | |
856 | ||
857 | m->event_retry = sd_event_source_unref(m->event_retry); | |
858 | if (!ratelimit_test(&m->ratelimit)) { | |
859 | log_debug("Slowing down attempts to contact servers."); | |
860 | ||
874ff7bf | 861 | 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 |
862 | if (r < 0) |
863 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
84e51726 LP |
864 | |
865 | return 0; | |
866 | } | |
867 | ||
868 | /* If we already are operating on some address, switch to the | |
869 | * next one. */ | |
870 | if (m->current_server_address && m->current_server_address->addresses_next) | |
874ff7bf | 871 | manager_set_server_address(m, m->current_server_address->addresses_next); |
84e51726 | 872 | else { |
874ff7bf LP |
873 | struct addrinfo hints = { |
874 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, | |
875 | .ai_socktype = SOCK_DGRAM, | |
876 | }; | |
84e51726 | 877 | |
874ff7bf | 878 | /* Hmm, we are through all addresses, let's look for the next host instead */ |
84e51726 | 879 | if (m->current_server_name && m->current_server_name->names_next) |
874ff7bf | 880 | manager_set_server_name(m, m->current_server_name->names_next); |
84e51726 | 881 | else { |
874ff7bf | 882 | ServerName *f; |
63463bf0 | 883 | bool restart = true; |
874ff7bf LP |
884 | |
885 | /* Our current server name list is exhausted, | |
886 | * let's find the next one to iterate. First | |
887 | * we try the system list, then the link list. | |
888 | * After having processed the link list we | |
889 | * jump back to the system list. However, if | |
890 | * both lists are empty, we change to the | |
891 | * fallback list. */ | |
892 | if (!m->current_server_name || m->current_server_name->type == SERVER_LINK) { | |
893 | f = m->system_servers; | |
894 | if (!f) | |
895 | f = m->link_servers; | |
896 | } else { | |
897 | f = m->link_servers; | |
898 | if (!f) | |
899 | f = m->system_servers; | |
63463bf0 ML |
900 | else |
901 | restart = false; | |
874ff7bf LP |
902 | } |
903 | ||
904 | if (!f) | |
905 | f = m->fallback_servers; | |
906 | ||
907 | if (!f) { | |
908 | manager_set_server_name(m, NULL); | |
84e51726 LP |
909 | log_debug("No server found."); |
910 | return 0; | |
911 | } | |
912 | ||
63463bf0 ML |
913 | if (restart && !m->exhausted_servers && m->poll_interval_usec) { |
914 | log_debug("Waiting after exhausting servers."); | |
915 | 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 |
916 | if (r < 0) |
917 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
63463bf0 ML |
918 | |
919 | m->exhausted_servers = true; | |
920 | ||
921 | /* Increase the polling interval */ | |
922 | if (m->poll_interval_usec < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) | |
923 | m->poll_interval_usec *= 2; | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | m->exhausted_servers = false; | |
929 | ||
874ff7bf | 930 | manager_set_server_name(m, f); |
84e51726 LP |
931 | } |
932 | ||
933 | /* Tell the resolver to reread /etc/resolv.conf, in | |
934 | * case it changed. */ | |
935 | res_init(); | |
936 | ||
874ff7bf LP |
937 | /* Flush out any previously resolved addresses */ |
938 | server_name_flush_addresses(m->current_server_name); | |
939 | ||
940 | log_debug("Resolving %s...", m->current_server_name->string); | |
941 | ||
84e51726 | 942 | r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m); |
f647962d MS |
943 | if (r < 0) |
944 | return log_error_errno(r, "Failed to create resolver: %m"); | |
84e51726 LP |
945 | |
946 | return 1; | |
947 | } | |
948 | ||
949 | r = manager_begin(m); | |
950 | if (r < 0) | |
951 | return r; | |
952 | ||
953 | return 1; | |
954 | } | |
955 | ||
84e51726 LP |
956 | void manager_disconnect(Manager *m) { |
957 | assert(m); | |
958 | ||
959 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
960 | ||
961 | m->event_timer = sd_event_source_unref(m->event_timer); | |
962 | ||
f89c4e15 | 963 | manager_listen_stop(m); |
84e51726 LP |
964 | |
965 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
966 | m->clock_watch_fd = safe_close(m->clock_watch_fd); | |
967 | ||
968 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
969 | ||
970 | sd_notifyf(false, "STATUS=Idle."); | |
971 | } | |
972 | ||
874ff7bf LP |
973 | void manager_flush_server_names(Manager *m, ServerType t) { |
974 | assert(m); | |
975 | ||
976 | if (t == SERVER_SYSTEM) | |
977 | while (m->system_servers) | |
978 | server_name_free(m->system_servers); | |
979 | ||
980 | if (t == SERVER_LINK) | |
981 | while (m->link_servers) | |
982 | server_name_free(m->link_servers); | |
983 | ||
984 | if (t == SERVER_FALLBACK) | |
985 | while (m->fallback_servers) | |
986 | server_name_free(m->fallback_servers); | |
987 | } | |
84e51726 LP |
988 | |
989 | void manager_free(Manager *m) { | |
990 | if (!m) | |
991 | return; | |
992 | ||
993 | manager_disconnect(m); | |
874ff7bf LP |
994 | manager_flush_server_names(m, SERVER_SYSTEM); |
995 | manager_flush_server_names(m, SERVER_LINK); | |
996 | manager_flush_server_names(m, SERVER_FALLBACK); | |
84e51726 LP |
997 | |
998 | sd_event_source_unref(m->event_retry); | |
999 | ||
1000 | sd_event_source_unref(m->network_event_source); | |
1001 | sd_network_monitor_unref(m->network_monitor); | |
1002 | ||
1003 | sd_resolve_unref(m->resolve); | |
1004 | sd_event_unref(m->event); | |
1005 | ||
1006 | free(m); | |
1007 | } | |
1008 | ||
874ff7bf LP |
1009 | static int manager_network_read_link_servers(Manager *m) { |
1010 | _cleanup_strv_free_ char **ntp = NULL; | |
1011 | ServerName *n, *nx; | |
1012 | char **i; | |
1013 | int r; | |
1014 | ||
84e51726 LP |
1015 | assert(m); |
1016 | ||
874ff7bf LP |
1017 | r = sd_network_get_ntp(&ntp); |
1018 | if (r < 0) | |
1019 | goto clear; | |
1020 | ||
1021 | LIST_FOREACH(names, n, m->link_servers) | |
1022 | n->marked = true; | |
1023 | ||
1024 | STRV_FOREACH(i, ntp) { | |
1025 | bool found = false; | |
1026 | ||
1027 | LIST_FOREACH(names, n, m->link_servers) | |
1028 | if (streq(n->string, *i)) { | |
1029 | n->marked = false; | |
1030 | found = true; | |
1031 | break; | |
1032 | } | |
1033 | ||
1034 | if (!found) { | |
1035 | r = server_name_new(m, NULL, SERVER_LINK, *i); | |
1036 | if (r < 0) | |
1037 | goto clear; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | LIST_FOREACH_SAFE(names, n, nx, m->link_servers) | |
1042 | if (n->marked) | |
1043 | server_name_free(n); | |
1044 | ||
1045 | return 0; | |
1046 | ||
1047 | clear: | |
1048 | manager_flush_server_names(m, SERVER_LINK); | |
1049 | return r; | |
84e51726 LP |
1050 | } |
1051 | ||
1052 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
1053 | Manager *m = userdata; | |
1054 | bool connected, online; | |
1055 | int r; | |
1056 | ||
1057 | assert(m); | |
1058 | ||
1059 | sd_network_monitor_flush(m->network_monitor); | |
1060 | ||
874ff7bf LP |
1061 | manager_network_read_link_servers(m); |
1062 | ||
84e51726 LP |
1063 | /* check if the machine is online */ |
1064 | online = network_is_online(); | |
1065 | ||
1066 | /* check if the client is currently connected */ | |
63463bf0 | 1067 | connected = m->server_socket >= 0 || m->resolve_query || m->exhausted_servers; |
84e51726 LP |
1068 | |
1069 | if (connected && !online) { | |
1070 | log_info("No network connectivity, watching for changes."); | |
1071 | manager_disconnect(m); | |
1072 | ||
1073 | } else if (!connected && online) { | |
1074 | log_info("Network configuration changed, trying to establish connection."); | |
1075 | ||
1076 | if (m->current_server_address) | |
1077 | r = manager_begin(m); | |
1078 | else | |
1079 | r = manager_connect(m); | |
1080 | if (r < 0) | |
1081 | return r; | |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | static int manager_network_monitor_listen(Manager *m) { | |
1088 | int r, fd, events; | |
1089 | ||
1090 | assert(m); | |
1091 | ||
1092 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
1093 | if (r < 0) | |
1094 | return r; | |
1095 | ||
1096 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
1097 | if (fd < 0) | |
1098 | return fd; | |
1099 | ||
1100 | events = sd_network_monitor_get_events(m->network_monitor); | |
1101 | if (events < 0) | |
1102 | return events; | |
1103 | ||
1104 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, manager_network_event_handler, m); | |
1105 | if (r < 0) | |
1106 | return r; | |
1107 | ||
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | int manager_new(Manager **ret) { | |
1112 | _cleanup_(manager_freep) Manager *m = NULL; | |
1113 | int r; | |
1114 | ||
1115 | assert(ret); | |
1116 | ||
1117 | m = new0(Manager, 1); | |
1118 | if (!m) | |
1119 | return -ENOMEM; | |
1120 | ||
1121 | m->server_socket = m->clock_watch_fd = -1; | |
1122 | ||
1123 | RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST); | |
1124 | ||
874ff7bf | 1125 | r = manager_parse_server_string(m, SERVER_FALLBACK, NTP_SERVERS); |
84e51726 LP |
1126 | if (r < 0) |
1127 | return r; | |
1128 | ||
1129 | r = sd_event_default(&m->event); | |
1130 | if (r < 0) | |
1131 | return r; | |
1132 | ||
1133 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
1134 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
1135 | ||
1136 | sd_event_set_watchdog(m->event, true); | |
1137 | ||
1138 | r = sd_resolve_default(&m->resolve); | |
1139 | if (r < 0) | |
1140 | return r; | |
1141 | ||
1142 | r = sd_resolve_attach_event(m->resolve, m->event, 0); | |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | ||
1146 | r = manager_network_monitor_listen(m); | |
1147 | if (r < 0) | |
1148 | return r; | |
1149 | ||
c572db3c | 1150 | manager_network_read_link_servers(m); |
874ff7bf | 1151 | |
84e51726 LP |
1152 | *ret = m; |
1153 | m = NULL; | |
1154 | ||
1155 | return 0; | |
1156 | } |