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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
84e51726 | 2 | |
84e51726 | 3 | #include <errno.h> |
84e51726 | 4 | #include <math.h> |
84e51726 LP |
5 | #include <netinet/in.h> |
6 | #include <netinet/ip.h> | |
07630cea LP |
7 | #include <resolv.h> |
8 | #include <stdlib.h> | |
84e51726 LP |
9 | #include <sys/timerfd.h> |
10 | #include <sys/timex.h> | |
84e51726 | 11 | #include <sys/types.h> |
07630cea LP |
12 | |
13 | #include "sd-daemon.h" | |
b016e77e | 14 | #include "sd-messages.h" |
84e51726 | 15 | |
b5efdb8a | 16 | #include "alloc-util.h" |
57b82eaa | 17 | #include "bus-polkit.h" |
dcb37458 | 18 | #include "dns-domain.h" |
ec75e8e0 | 19 | #include "event-util.h" |
3ffd4af2 | 20 | #include "fd-util.h" |
ca78ad1d | 21 | #include "format-util.h" |
f4f15635 | 22 | #include "fs-util.h" |
84e51726 | 23 | #include "list.h" |
07630cea | 24 | #include "log.h" |
07630cea | 25 | #include "network-util.h" |
84e51726 | 26 | #include "ratelimit.h" |
7082bb05 | 27 | #include "resolve-private.h" |
07630cea | 28 | #include "socket-util.h" |
07630cea | 29 | #include "string-util.h" |
84e51726 | 30 | #include "strv.h" |
07630cea | 31 | #include "time-util.h" |
84e51726 LP |
32 | #include "timesyncd-conf.h" |
33 | #include "timesyncd-manager.h" | |
1f129b7f | 34 | #include "user-util.h" |
3ffd4af2 | 35 | #include "util.h" |
84e51726 LP |
36 | |
37 | #ifndef ADJ_SETOFFSET | |
38 | #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */ | |
39 | #endif | |
40 | ||
403db470 | 41 | /* Expected accuracy of time synchronization; used to adjust the poll interval */ |
84e51726 LP |
42 | #define NTP_ACCURACY_SEC 0.2 |
43 | ||
84e51726 LP |
44 | /* |
45 | * Maximum delta in seconds which the system clock is gradually adjusted | |
a4465d0d | 46 | * (slewed) to approach the network time. Deltas larger that this are set by |
84e51726 LP |
47 | * letting the system time jump. The kernel's limit for adjtime is 0.5s. |
48 | */ | |
49 | #define NTP_MAX_ADJUST 0.4 | |
50 | ||
a4465d0d | 51 | /* Default of maximum acceptable root distance in microseconds. */ |
403db470 | 52 | #define NTP_ROOT_DISTANCE_MAX_USEC (5 * USEC_PER_SEC) |
3af0442c | 53 | |
e8206972 ML |
54 | /* Maximum number of missed replies before selecting another source. */ |
55 | #define NTP_MAX_MISSED_REPLIES 2 | |
56 | ||
84e51726 LP |
57 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) |
58 | #define RATELIMIT_BURST 10 | |
59 | ||
60 | #define TIMEOUT_USEC (10*USEC_PER_SEC) | |
61 | ||
84e51726 LP |
62 | static int manager_arm_timer(Manager *m, usec_t next); |
63 | static int manager_clock_watch_setup(Manager *m); | |
7b628891 | 64 | static int manager_listen_setup(Manager *m); |
f89c4e15 | 65 | static void manager_listen_stop(Manager *m); |
1f129b7f | 66 | static int manager_save_time_and_rearm(Manager *m, usec_t t); |
84e51726 | 67 | |
3af0442c ML |
68 | static double ntp_ts_short_to_d(const struct ntp_ts_short *ts) { |
69 | return be16toh(ts->sec) + (be16toh(ts->frac) / 65536.0); | |
70 | } | |
71 | ||
84e51726 LP |
72 | static double ntp_ts_to_d(const struct ntp_ts *ts) { |
73 | return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX); | |
74 | } | |
75 | ||
76 | static double ts_to_d(const struct timespec *ts) { | |
77 | return ts->tv_sec + (1.0e-9 * ts->tv_nsec); | |
78 | } | |
79 | ||
370d3c31 | 80 | static uint32_t graceful_add_offset_1900_1970(time_t t) { |
81 | /* Adds OFFSET_1900_1970 to t and returns it as 32bit value. This is handles overflows | |
82 | * gracefully in a deterministic and well-defined way by cutting off the top bits. */ | |
83 | uint64_t a = (uint64_t) t + OFFSET_1900_1970; | |
84 | return (uint32_t) (a & UINT64_C(0xFFFFFFFF)); | |
85 | } | |
86 | ||
84e51726 LP |
87 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { |
88 | _cleanup_free_ char *pretty = NULL; | |
89 | Manager *m = userdata; | |
90 | ||
91 | assert(m); | |
92 | assert(m->current_server_name); | |
93 | assert(m->current_server_address); | |
94 | ||
95 | server_address_pretty(m->current_server_address, &pretty); | |
96 | log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string); | |
97 | ||
98 | return manager_connect(m); | |
99 | } | |
100 | ||
101 | static int manager_send_request(Manager *m) { | |
102 | _cleanup_free_ char *pretty = NULL; | |
103 | struct ntp_msg ntpmsg = { | |
104 | /* | |
105 | * "The client initializes the NTP message header, sends the request | |
106 | * to the server, and strips the time of day from the Transmit | |
107 | * Timestamp field of the reply. For this purpose, all the NTP | |
108 | * header fields are set to 0, except the Mode, VN, and optional | |
109 | * Transmit Timestamp fields." | |
110 | */ | |
111 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
112 | }; | |
113 | ssize_t len; | |
114 | int r; | |
115 | ||
116 | assert(m); | |
117 | assert(m->current_server_name); | |
118 | assert(m->current_server_address); | |
119 | ||
120 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
121 | ||
f89c4e15 LP |
122 | r = manager_listen_setup(m); |
123 | if (r < 0) | |
105a1a36 | 124 | return log_warning_errno(r, "Failed to set up connection socket: %m"); |
7b628891 | 125 | |
84e51726 LP |
126 | /* |
127 | * Set transmit timestamp, remember it; the server will send that back | |
128 | * as the origin timestamp and we have an indication that this is the | |
129 | * matching answer to our request. | |
130 | * | |
131 | * The actual value does not matter, We do not care about the correct | |
132 | * NTP UINT_MAX fraction; we just pass the plain nanosecond value. | |
133 | */ | |
ba4e0427 | 134 | assert_se(clock_gettime(CLOCK_BOOTTIME, &m->trans_time_mon) >= 0); |
84e51726 | 135 | assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0); |
370d3c31 | 136 | ntpmsg.trans_time.sec = htobe32(graceful_add_offset_1900_1970(m->trans_time.tv_sec)); |
84e51726 LP |
137 | ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec); |
138 | ||
139 | server_address_pretty(m->current_server_address, &pretty); | |
140 | ||
141 | len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen); | |
142 | if (len == sizeof(ntpmsg)) { | |
143 | m->pending = true; | |
144 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); | |
145 | } else { | |
56f64d95 | 146 | log_debug_errno(errno, "Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); |
84e51726 LP |
147 | return manager_connect(m); |
148 | } | |
149 | ||
ab4df227 | 150 | /* re-arm timer with increasing timeout, in case the packets never arrive back */ |
5919bd3d ZJS |
151 | if (m->retry_interval == 0) |
152 | m->retry_interval = NTP_RETRY_INTERVAL_MIN_USEC; | |
153 | else | |
154 | m->retry_interval = MIN(m->retry_interval * 4/3, NTP_RETRY_INTERVAL_MAX_USEC); | |
ab4df227 KS |
155 | |
156 | r = manager_arm_timer(m, m->retry_interval); | |
f647962d MS |
157 | if (r < 0) |
158 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
ab4df227 | 159 | |
e8206972 ML |
160 | m->missed_replies++; |
161 | if (m->missed_replies > NTP_MAX_MISSED_REPLIES) { | |
162 | r = sd_event_add_time( | |
163 | m->event, | |
164 | &m->event_timeout, | |
ba4e0427 LP |
165 | CLOCK_BOOTTIME, |
166 | now(CLOCK_BOOTTIME) + TIMEOUT_USEC, 0, | |
e8206972 | 167 | manager_timeout, m); |
f647962d MS |
168 | if (r < 0) |
169 | return log_error_errno(r, "Failed to arm timeout timer: %m"); | |
84e51726 LP |
170 | } |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
176 | Manager *m = userdata; | |
177 | ||
178 | assert(m); | |
179 | ||
180 | return manager_send_request(m); | |
181 | } | |
182 | ||
183 | static int manager_arm_timer(Manager *m, usec_t next) { | |
184 | int r; | |
185 | ||
186 | assert(m); | |
84e51726 LP |
187 | |
188 | if (next == 0) { | |
189 | m->event_timer = sd_event_source_unref(m->event_timer); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | if (m->event_timer) { | |
39cf0351 | 194 | r = sd_event_source_set_time_relative(m->event_timer, next); |
84e51726 LP |
195 | if (r < 0) |
196 | return r; | |
197 | ||
198 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); | |
199 | } | |
200 | ||
39cf0351 | 201 | return sd_event_add_time_relative( |
84e51726 LP |
202 | m->event, |
203 | &m->event_timer, | |
ba4e0427 | 204 | CLOCK_BOOTTIME, |
39cf0351 | 205 | next, 0, |
84e51726 LP |
206 | manager_timer, m); |
207 | } | |
208 | ||
209 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
210 | Manager *m = userdata; | |
211 | ||
212 | assert(m); | |
213 | ||
214 | /* rearm timer */ | |
215 | manager_clock_watch_setup(m); | |
216 | ||
217 | /* skip our own jumps */ | |
218 | if (m->jumped) { | |
219 | m->jumped = false; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /* resync */ | |
7e3254b3 | 224 | log_debug("System time changed. Resyncing."); |
84e51726 LP |
225 | m->poll_resync = true; |
226 | ||
227 | return manager_send_request(m); | |
228 | } | |
229 | ||
230 | /* wake up when the system time changes underneath us */ | |
231 | static int manager_clock_watch_setup(Manager *m) { | |
84e51726 LP |
232 | int r; |
233 | ||
234 | assert(m); | |
235 | ||
ec75e8e0 | 236 | m->event_clock_watch = sd_event_source_disable_unref(m->event_clock_watch); |
84e51726 | 237 | |
ec75e8e0 | 238 | r = event_add_time_change(m->event, &m->event_clock_watch, manager_clock_watch, m); |
f647962d MS |
239 | if (r < 0) |
240 | return log_error_errno(r, "Failed to create clock watch event source: %m"); | |
84e51726 LP |
241 | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { | |
40c6b514 | 246 | struct timex tmx; |
84e51726 LP |
247 | |
248 | assert(m); | |
249 | ||
9a8b4302 LP |
250 | /* For small deltas, tell the kernel to gradually adjust the system clock to the NTP time, larger |
251 | * deltas are just directly set. */ | |
84e51726 | 252 | if (fabs(offset) < NTP_MAX_ADJUST) { |
40c6b514 LP |
253 | tmx = (struct timex) { |
254 | .modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR, | |
255 | .status = STA_PLL, | |
256 | .offset = offset * NSEC_PER_SEC, | |
257 | .constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4, | |
258 | }; | |
259 | ||
ff49bc32 | 260 | log_debug(" adjust (slew): %+.3f sec", offset); |
84e51726 | 261 | } else { |
40c6b514 LP |
262 | tmx = (struct timex) { |
263 | .modes = ADJ_STATUS | ADJ_NANO | ADJ_SETOFFSET | ADJ_MAXERROR | ADJ_ESTERROR, | |
84e51726 | 264 | |
40c6b514 LP |
265 | /* ADJ_NANO uses nanoseconds in the microseconds field */ |
266 | .time.tv_sec = (long)offset, | |
267 | .time.tv_usec = (offset - (double) (long) offset) * NSEC_PER_SEC, | |
268 | }; | |
84e51726 LP |
269 | |
270 | /* the kernel expects -0.3s as {-1, 7000.000.000} */ | |
271 | if (tmx.time.tv_usec < 0) { | |
272 | tmx.time.tv_sec -= 1; | |
273 | tmx.time.tv_usec += NSEC_PER_SEC; | |
274 | } | |
275 | ||
276 | m->jumped = true; | |
ff49bc32 | 277 | log_debug(" adjust (jump): %+.3f sec", offset); |
84e51726 LP |
278 | } |
279 | ||
9a8b4302 LP |
280 | /* An unset STA_UNSYNC will enable the kernel's 11-minute mode, which syncs the system time |
281 | * periodically to the RTC. | |
84e51726 | 282 | * |
9a8b4302 LP |
283 | * In case the RTC runs in local time, never touch the RTC, we have no way to properly handle |
284 | * daylight saving changes and mobile devices moving between time zones. */ | |
84e51726 LP |
285 | if (m->rtc_local_time) |
286 | tmx.status |= STA_UNSYNC; | |
287 | ||
288 | switch (leap_sec) { | |
289 | case 1: | |
290 | tmx.status |= STA_INS; | |
291 | break; | |
292 | case -1: | |
293 | tmx.status |= STA_DEL; | |
294 | break; | |
295 | } | |
296 | ||
aabda4f3 | 297 | if (clock_adjtime(CLOCK_REALTIME, &tmx) < 0) |
6ff6f4d8 | 298 | return -errno; |
84e51726 | 299 | |
66086a40 | 300 | m->drift_freq = tmx.freq; |
84e51726 LP |
301 | |
302 | log_debug(" status : %04i %s\n" | |
0060bb8f | 303 | " time now : %"PRI_TIME".%03"PRI_USEC"\n" |
3bd7ef83 | 304 | " constant : %"PRI_TIMEX"\n" |
84e51726 | 305 | " offset : %+.3f sec\n" |
66086a40 | 306 | " freq offset : %+"PRI_TIMEX" (%+"PRI_TIMEX" ppm)\n", |
84e51726 | 307 | tmx.status, tmx.status & STA_UNSYNC ? "unsync" : "sync", |
70887c5f | 308 | tmx.time.tv_sec, tmx.time.tv_usec / NSEC_PER_MSEC, |
84e51726 LP |
309 | tmx.constant, |
310 | (double)tmx.offset / NSEC_PER_SEC, | |
66086a40 | 311 | tmx.freq, tmx.freq / 65536); |
84e51726 LP |
312 | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { | |
14cb109d | 317 | unsigned i, idx_cur, idx_new, idx_min; |
84e51726 LP |
318 | double jitter; |
319 | double j; | |
320 | ||
321 | assert(m); | |
322 | ||
323 | m->packet_count++; | |
324 | ||
325 | /* ignore initial sample */ | |
326 | if (m->packet_count == 1) | |
327 | return false; | |
328 | ||
329 | /* store the current data in our samples array */ | |
330 | idx_cur = m->samples_idx; | |
331 | idx_new = (idx_cur + 1) % ELEMENTSOF(m->samples); | |
332 | m->samples_idx = idx_new; | |
333 | m->samples[idx_new].offset = offset; | |
334 | m->samples[idx_new].delay = delay; | |
335 | ||
336 | /* calculate new jitter value from the RMS differences relative to the lowest delay sample */ | |
337 | jitter = m->samples_jitter; | |
338 | for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(m->samples); i++) | |
339 | if (m->samples[i].delay > 0 && m->samples[i].delay < m->samples[idx_min].delay) | |
340 | idx_min = i; | |
341 | ||
342 | j = 0; | |
343 | for (i = 0; i < ELEMENTSOF(m->samples); i++) | |
fa66b606 | 344 | j += pow(m->samples[i].offset - m->samples[idx_min].offset, 2); |
84e51726 LP |
345 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); |
346 | ||
347 | /* ignore samples when resyncing */ | |
348 | if (m->poll_resync) | |
349 | return false; | |
350 | ||
351 | /* always accept offset if we are farther off than the round-trip delay */ | |
352 | if (fabs(offset) > delay) | |
353 | return false; | |
354 | ||
355 | /* we need a few samples before looking at them */ | |
356 | if (m->packet_count < 4) | |
357 | return false; | |
358 | ||
359 | /* do not accept anything worse than the maximum possible error of the best sample */ | |
360 | if (fabs(offset) > m->samples[idx_min].delay) | |
361 | return true; | |
362 | ||
363 | /* compare the difference between the current offset to the previous offset and jitter */ | |
364 | return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter; | |
365 | } | |
366 | ||
367 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { | |
368 | assert(m); | |
369 | ||
370 | if (m->poll_resync) { | |
a4465d0d | 371 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
372 | m->poll_resync = false; |
373 | return; | |
374 | } | |
375 | ||
376 | /* set to minimal poll interval */ | |
377 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { | |
a4465d0d | 378 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
379 | return; |
380 | } | |
381 | ||
382 | /* increase polling interval */ | |
383 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { | |
a4465d0d | 384 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
84e51726 LP |
385 | m->poll_interval_usec *= 2; |
386 | return; | |
387 | } | |
388 | ||
389 | /* decrease polling interval */ | |
390 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { | |
a4465d0d | 391 | if (m->poll_interval_usec > m->poll_interval_min_usec) |
84e51726 LP |
392 | m->poll_interval_usec /= 2; |
393 | return; | |
394 | } | |
395 | } | |
396 | ||
397 | static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
398 | Manager *m = userdata; | |
399 | struct ntp_msg ntpmsg; | |
400 | ||
401 | struct iovec iov = { | |
402 | .iov_base = &ntpmsg, | |
403 | .iov_len = sizeof(ntpmsg), | |
404 | }; | |
f782eee6 YW |
405 | /* This needs to be initialized with zero. See #20741. */ |
406 | CMSG_BUFFER_TYPE(CMSG_SPACE_TIMESPEC) control = {}; | |
84e51726 LP |
407 | union sockaddr_union server_addr; |
408 | struct msghdr msghdr = { | |
409 | .msg_iov = &iov, | |
410 | .msg_iovlen = 1, | |
411 | .msg_control = &control, | |
412 | .msg_controllen = sizeof(control), | |
413 | .msg_name = &server_addr, | |
414 | .msg_namelen = sizeof(server_addr), | |
415 | }; | |
1cc6c93a | 416 | struct timespec *recv_time = NULL; |
1f129b7f | 417 | triple_timestamp dts; |
84e51726 | 418 | ssize_t len; |
5ba674cc | 419 | double origin, receive, trans, dest, delay, offset, root_distance; |
84e51726 | 420 | bool spike; |
5ba674cc | 421 | int leap_sec, r; |
84e51726 LP |
422 | |
423 | assert(source); | |
424 | assert(m); | |
425 | ||
426 | if (revents & (EPOLLHUP|EPOLLERR)) { | |
427 | log_warning("Server connection returned error."); | |
428 | return manager_connect(m); | |
429 | } | |
430 | ||
3691bcf3 LP |
431 | len = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT); |
432 | if (len == -EAGAIN) | |
433 | return 0; | |
84e51726 | 434 | if (len < 0) { |
3691bcf3 | 435 | log_warning_errno(len, "Error receiving message, disconnecting: %m"); |
84e51726 LP |
436 | return manager_connect(m); |
437 | } | |
438 | ||
43fcd650 TM |
439 | /* Too short or too long packet? */ |
440 | if (iov.iov_len < sizeof(struct ntp_msg) || (msghdr.msg_flags & MSG_TRUNC)) { | |
84e51726 LP |
441 | log_warning("Invalid response from server. Disconnecting."); |
442 | return manager_connect(m); | |
443 | } | |
444 | ||
445 | if (!m->current_server_name || | |
446 | !m->current_server_address || | |
447 | !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) { | |
448 | log_debug("Response from unknown server."); | |
449 | return 0; | |
450 | } | |
451 | ||
adc07c2b | 452 | recv_time = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_TIMESTAMPNS, struct timespec); |
baaa35ad | 453 | if (!recv_time) |
adc07c2b | 454 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Packet timestamp missing."); |
84e51726 LP |
455 | |
456 | if (!m->pending) { | |
457 | log_debug("Unexpected reply. Ignoring."); | |
458 | return 0; | |
459 | } | |
460 | ||
e8206972 ML |
461 | m->missed_replies = 0; |
462 | ||
84e51726 | 463 | /* check our "time cookie" (we just stored nanoseconds in the fraction field) */ |
370d3c31 | 464 | if (be32toh(ntpmsg.origin_time.sec) != graceful_add_offset_1900_1970(m->trans_time.tv_sec) || |
edd50d5e | 465 | be32toh(ntpmsg.origin_time.frac) != (unsigned long) m->trans_time.tv_nsec) { |
84e51726 LP |
466 | log_debug("Invalid reply; not our transmit time. Ignoring."); |
467 | return 0; | |
468 | } | |
469 | ||
470 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
471 | ||
472 | if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 || | |
473 | be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) { | |
474 | log_debug("Invalid reply, returned times before epoch. Ignoring."); | |
475 | return manager_connect(m); | |
476 | } | |
477 | ||
07610e10 ML |
478 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC || |
479 | ntpmsg.stratum == 0 || ntpmsg.stratum >= 16) { | |
84e51726 LP |
480 | log_debug("Server is not synchronized. Disconnecting."); |
481 | return manager_connect(m); | |
482 | } | |
483 | ||
484 | if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) { | |
485 | log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field)); | |
486 | return manager_connect(m); | |
487 | } | |
488 | ||
489 | if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) { | |
490 | log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field)); | |
491 | return manager_connect(m); | |
492 | } | |
493 | ||
3af0442c | 494 | root_distance = ntp_ts_short_to_d(&ntpmsg.root_delay) / 2 + ntp_ts_short_to_d(&ntpmsg.root_dispersion); |
403db470 | 495 | if (root_distance > (double) m->root_distance_max_usec / (double) USEC_PER_SEC) { |
ce96c9cb | 496 | log_info("Server has too large root distance. Disconnecting."); |
3af0442c ML |
497 | return manager_connect(m); |
498 | } | |
499 | ||
84e51726 LP |
500 | /* valid packet */ |
501 | m->pending = false; | |
ab4df227 | 502 | m->retry_interval = 0; |
84e51726 | 503 | |
7b628891 | 504 | /* Stop listening */ |
f89c4e15 | 505 | manager_listen_stop(m); |
7b628891 | 506 | |
84e51726 LP |
507 | /* announce leap seconds */ |
508 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) | |
509 | leap_sec = 1; | |
510 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) | |
511 | leap_sec = -1; | |
512 | else | |
513 | leap_sec = 0; | |
514 | ||
515 | /* | |
516 | * "Timestamp Name ID When Generated | |
517 | * ------------------------------------------------------------ | |
518 | * Originate Timestamp T1 time request sent by client | |
519 | * Receive Timestamp T2 time request received by server | |
520 | * Transmit Timestamp T3 time reply sent by server | |
521 | * Destination Timestamp T4 time reply received by client | |
522 | * | |
523 | * The round-trip delay, d, and system clock offset, t, are defined as: | |
524 | * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2" | |
525 | */ | |
73c76e63 | 526 | origin = ts_to_d(&m->trans_time) + OFFSET_1900_1970; |
84e51726 LP |
527 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
528 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
487a3682 | 529 | dest = ts_to_d(recv_time) + OFFSET_1900_1970; |
84e51726 LP |
530 | |
531 | offset = ((receive - origin) + (trans - dest)) / 2; | |
532 | delay = (dest - origin) - (trans - receive); | |
533 | ||
534 | spike = manager_sample_spike_detection(m, offset, delay); | |
535 | ||
536 | manager_adjust_poll(m, offset, spike); | |
537 | ||
538 | log_debug("NTP response:\n" | |
539 | " leap : %u\n" | |
540 | " version : %u\n" | |
541 | " mode : %u\n" | |
542 | " stratum : %u\n" | |
543 | " precision : %.6f sec (%d)\n" | |
3af0442c | 544 | " root distance: %.6f sec\n" |
84e51726 LP |
545 | " reference : %.4s\n" |
546 | " origin : %.3f\n" | |
547 | " receive : %.3f\n" | |
548 | " transmit : %.3f\n" | |
549 | " dest : %.3f\n" | |
550 | " offset : %+.3f sec\n" | |
551 | " delay : %+.3f sec\n" | |
552 | " packet count : %"PRIu64"\n" | |
553 | " jitter : %.3f%s\n" | |
554 | " poll interval: " USEC_FMT "\n", | |
555 | NTP_FIELD_LEAP(ntpmsg.field), | |
556 | NTP_FIELD_VERSION(ntpmsg.field), | |
557 | NTP_FIELD_MODE(ntpmsg.field), | |
558 | ntpmsg.stratum, | |
559 | exp2(ntpmsg.precision), ntpmsg.precision, | |
3af0442c | 560 | root_distance, |
84e51726 LP |
561 | ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a", |
562 | origin - OFFSET_1900_1970, | |
563 | receive - OFFSET_1900_1970, | |
564 | trans - OFFSET_1900_1970, | |
565 | dest - OFFSET_1900_1970, | |
566 | offset, delay, | |
567 | m->packet_count, | |
568 | m->samples_jitter, spike ? " spike" : "", | |
569 | m->poll_interval_usec / USEC_PER_SEC); | |
570 | ||
1f129b7f LP |
571 | /* Get current monotonic/realtime clocks immediately before adjusting the latter */ |
572 | triple_timestamp_get(&dts); | |
573 | ||
84e51726 | 574 | if (!spike) { |
1f129b7f LP |
575 | /* Fix up our idea of the time. */ |
576 | dts.realtime = (usec_t) (dts.realtime + offset * USEC_PER_SEC); | |
577 | ||
84e51726 LP |
578 | r = manager_adjust_clock(m, offset, leap_sec); |
579 | if (r < 0) | |
6ff6f4d8 | 580 | log_error_errno(r, "Failed to call clock_adjtime(): %m"); |
7cb08ea8 | 581 | |
1f129b7f | 582 | (void) manager_save_time_and_rearm(m, dts.realtime); |
7cb08ea8 LP |
583 | |
584 | /* If touch fails, there isn't much we can do. Maybe it'll work next time. */ | |
1aa7ca22 LP |
585 | r = touch("/run/systemd/timesync/synchronized"); |
586 | if (r < 0) | |
587 | log_debug_errno(r, "Failed to touch /run/systemd/timesync/synchronized, ignoring: %m"); | |
84e51726 LP |
588 | } |
589 | ||
66086a40 YW |
590 | /* Save NTP response */ |
591 | m->ntpmsg = ntpmsg; | |
592 | m->origin_time = m->trans_time; | |
593 | m->dest_time = *recv_time; | |
594 | m->spike = spike; | |
595 | ||
75ca1621 | 596 | log_debug("interval/delta/delay/jitter/drift " USEC_FMT "s/%+.3fs/%.3fs/%.3fs/%+"PRIi64"ppm%s", |
66086a40 | 597 | m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_freq / 65536, |
7b5b3fc3 | 598 | spike ? " (ignored)" : ""); |
84e51726 | 599 | |
933e95d7 YW |
600 | if (sd_bus_is_ready(m->bus) > 0) |
601 | (void) sd_bus_emit_properties_changed( | |
602 | m->bus, | |
603 | "/org/freedesktop/timesync1", | |
604 | "org.freedesktop.timesync1.Manager", | |
605 | "NTPMessage", | |
606 | NULL); | |
66086a40 | 607 | |
87057128 | 608 | if (!m->talking) { |
481b3f9e LP |
609 | _cleanup_free_ char *pretty = NULL; |
610 | ||
87057128 | 611 | m->talking = true; |
481b3f9e | 612 | |
c696878a LP |
613 | (void) server_address_pretty(m->current_server_address, &pretty); |
614 | ||
922a6508 LP |
615 | log_info("Contacted time server %s (%s).", strna(pretty), m->current_server_name->string); |
616 | (void) sd_notifyf(false, "STATUS=Contacted time server %s (%s).", strna(pretty), m->current_server_name->string); | |
481b3f9e LP |
617 | } |
618 | ||
b016e77e LP |
619 | if (!spike && !m->synchronized) { |
620 | m->synchronized = true; | |
621 | ||
622 | log_struct(LOG_INFO, | |
623 | LOG_MESSAGE("Initial clock synchronization to %s.", FORMAT_TIMESTAMP_STYLE(dts.realtime, TIMESTAMP_US)), | |
624 | "MESSAGE_ID=" SD_MESSAGE_TIME_SYNC_STR, | |
625 | "MONOTONIC_USEC=" USEC_FMT, dts.monotonic, | |
626 | "REALTIME_USEC=" USEC_FMT, dts.realtime, | |
627 | "BOOTIME_USEC=" USEC_FMT, dts.boottime); | |
628 | } | |
629 | ||
84e51726 | 630 | r = manager_arm_timer(m, m->poll_interval_usec); |
f647962d MS |
631 | if (r < 0) |
632 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
84e51726 LP |
633 | |
634 | return 0; | |
635 | } | |
636 | ||
637 | static int manager_listen_setup(Manager *m) { | |
638 | union sockaddr_union addr = {}; | |
84e51726 LP |
639 | int r; |
640 | ||
641 | assert(m); | |
642 | ||
f89c4e15 LP |
643 | if (m->server_socket >= 0) |
644 | return 0; | |
645 | ||
84e51726 LP |
646 | assert(!m->event_receive); |
647 | assert(m->current_server_address); | |
648 | ||
649 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; | |
650 | ||
651 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); | |
652 | if (m->server_socket < 0) | |
653 | return -errno; | |
654 | ||
655 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); | |
656 | if (r < 0) | |
657 | return -errno; | |
658 | ||
2ff48e98 | 659 | r = setsockopt_int(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, true); |
84e51726 | 660 | if (r < 0) |
2ff48e98 | 661 | return r; |
84e51726 | 662 | |
00df39a5 LP |
663 | if (addr.sa.sa_family == AF_INET) |
664 | (void) setsockopt_int(m->server_socket, IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY); | |
84e51726 LP |
665 | |
666 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); | |
667 | } | |
668 | ||
f89c4e15 LP |
669 | static void manager_listen_stop(Manager *m) { |
670 | assert(m); | |
671 | ||
672 | m->event_receive = sd_event_source_unref(m->event_receive); | |
673 | m->server_socket = safe_close(m->server_socket); | |
674 | } | |
675 | ||
84e51726 LP |
676 | static int manager_begin(Manager *m) { |
677 | _cleanup_free_ char *pretty = NULL; | |
678 | int r; | |
679 | ||
680 | assert(m); | |
681 | assert_return(m->current_server_name, -EHOSTUNREACH); | |
682 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
683 | ||
87057128 | 684 | m->talking = false; |
e8206972 | 685 | m->missed_replies = NTP_MAX_MISSED_REPLIES; |
80cd2606 | 686 | if (m->poll_interval_usec == 0) |
a4465d0d | 687 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
688 | |
689 | server_address_pretty(m->current_server_address, &pretty); | |
481b3f9e | 690 | log_debug("Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); |
c696878a | 691 | (void) sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); |
84e51726 | 692 | |
84e51726 LP |
693 | r = manager_clock_watch_setup(m); |
694 | if (r < 0) | |
695 | return r; | |
696 | ||
697 | return manager_send_request(m); | |
698 | } | |
699 | ||
874ff7bf LP |
700 | void manager_set_server_name(Manager *m, ServerName *n) { |
701 | assert(m); | |
84e51726 | 702 | |
874ff7bf LP |
703 | if (m->current_server_name == n) |
704 | return; | |
84e51726 | 705 | |
874ff7bf LP |
706 | m->current_server_name = n; |
707 | m->current_server_address = NULL; | |
708 | ||
709 | manager_disconnect(m); | |
84e51726 | 710 | |
874ff7bf LP |
711 | if (n) |
712 | log_debug("Selected server %s.", n->string); | |
713 | } | |
84e51726 | 714 | |
874ff7bf | 715 | void manager_set_server_address(Manager *m, ServerAddress *a) { |
84e51726 LP |
716 | assert(m); |
717 | ||
874ff7bf LP |
718 | if (m->current_server_address == a) |
719 | return; | |
720 | ||
874ff7bf | 721 | m->current_server_address = a; |
20f8d3cf SN |
722 | /* If a is NULL, we are just clearing the address, without |
723 | * changing the name. Keep the existing name in that case. */ | |
724 | if (a) | |
725 | m->current_server_name = a->name; | |
874ff7bf LP |
726 | |
727 | manager_disconnect(m); | |
728 | ||
729 | if (a) { | |
730 | _cleanup_free_ char *pretty = NULL; | |
731 | server_address_pretty(a, &pretty); | |
732 | log_debug("Selected address %s of server %s.", strna(pretty), a->name->string); | |
84e51726 LP |
733 | } |
734 | } | |
735 | ||
7082bb05 | 736 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, Manager *m) { |
874ff7bf | 737 | int r; |
84e51726 LP |
738 | |
739 | assert(q); | |
740 | assert(m); | |
741 | assert(m->current_server_name); | |
742 | ||
743 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
744 | ||
745 | if (ret != 0) { | |
746 | log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); | |
747 | ||
748 | /* Try next host */ | |
749 | return manager_connect(m); | |
750 | } | |
751 | ||
84e51726 LP |
752 | for (; ai; ai = ai->ai_next) { |
753 | _cleanup_free_ char *pretty = NULL; | |
874ff7bf | 754 | ServerAddress *a; |
84e51726 LP |
755 | |
756 | assert(ai->ai_addr); | |
757 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
84e51726 LP |
758 | |
759 | if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) { | |
760 | log_warning("Unsuitable address protocol for %s", m->current_server_name->string); | |
761 | continue; | |
762 | } | |
763 | ||
874ff7bf | 764 | r = server_address_new(m->current_server_name, &a, (const union sockaddr_union*) ai->ai_addr, ai->ai_addrlen); |
f647962d MS |
765 | if (r < 0) |
766 | return log_error_errno(r, "Failed to add server address: %m"); | |
84e51726 | 767 | |
874ff7bf | 768 | server_address_pretty(a, &pretty); |
84e51726 LP |
769 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
770 | } | |
771 | ||
772 | if (!m->current_server_name->addresses) { | |
773 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
774 | ||
775 | /* Try next host */ | |
776 | return manager_connect(m); | |
777 | } | |
778 | ||
874ff7bf | 779 | manager_set_server_address(m, m->current_server_name->addresses); |
84e51726 LP |
780 | |
781 | return manager_begin(m); | |
782 | } | |
783 | ||
874ff7bf | 784 | static int manager_retry_connect(sd_event_source *source, usec_t usec, void *userdata) { |
84e51726 LP |
785 | Manager *m = userdata; |
786 | ||
787 | assert(m); | |
788 | ||
789 | return manager_connect(m); | |
790 | } | |
791 | ||
792 | int manager_connect(Manager *m) { | |
84e51726 LP |
793 | int r; |
794 | ||
795 | assert(m); | |
796 | ||
797 | manager_disconnect(m); | |
798 | ||
799 | m->event_retry = sd_event_source_unref(m->event_retry); | |
7994ac1d | 800 | if (!ratelimit_below(&m->ratelimit)) { |
a9061d97 | 801 | log_debug("Delaying attempts to contact servers."); |
84e51726 | 802 | |
ba4e0427 | 803 | r = sd_event_add_time_relative(m->event, &m->event_retry, CLOCK_BOOTTIME, m->connection_retry_usec, |
e81a44bf | 804 | 0, manager_retry_connect, m); |
f647962d MS |
805 | if (r < 0) |
806 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
84e51726 LP |
807 | |
808 | return 0; | |
809 | } | |
810 | ||
811 | /* If we already are operating on some address, switch to the | |
812 | * next one. */ | |
813 | if (m->current_server_address && m->current_server_address->addresses_next) | |
874ff7bf | 814 | manager_set_server_address(m, m->current_server_address->addresses_next); |
84e51726 | 815 | else { |
853efc39 | 816 | static const struct addrinfo hints = { |
874ff7bf LP |
817 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, |
818 | .ai_socktype = SOCK_DGRAM, | |
819 | }; | |
84e51726 | 820 | |
874ff7bf | 821 | /* Hmm, we are through all addresses, let's look for the next host instead */ |
84e51726 | 822 | if (m->current_server_name && m->current_server_name->names_next) |
874ff7bf | 823 | manager_set_server_name(m, m->current_server_name->names_next); |
84e51726 | 824 | else { |
874ff7bf | 825 | ServerName *f; |
63463bf0 | 826 | bool restart = true; |
874ff7bf LP |
827 | |
828 | /* Our current server name list is exhausted, | |
57b82eaa DM |
829 | * let's find the next one to iterate. First we try the runtime list, then the system list, |
830 | * then the link list. After having processed the link list we jump back to the system list | |
831 | * if no runtime server list. | |
832 | * However, if all lists are empty, we change to the fallback list. */ | |
874ff7bf | 833 | if (!m->current_server_name || m->current_server_name->type == SERVER_LINK) { |
57b82eaa DM |
834 | f = m->runtime_servers; |
835 | if (!f) | |
836 | f = m->system_servers; | |
874ff7bf LP |
837 | if (!f) |
838 | f = m->link_servers; | |
839 | } else { | |
840 | f = m->link_servers; | |
57b82eaa | 841 | if (f) |
63463bf0 | 842 | restart = false; |
57b82eaa DM |
843 | else { |
844 | f = m->runtime_servers; | |
845 | if (!f) | |
846 | f = m->system_servers; | |
847 | } | |
874ff7bf LP |
848 | } |
849 | ||
850 | if (!f) | |
851 | f = m->fallback_servers; | |
852 | ||
853 | if (!f) { | |
854 | manager_set_server_name(m, NULL); | |
84e51726 LP |
855 | log_debug("No server found."); |
856 | return 0; | |
857 | } | |
858 | ||
a08ea295 | 859 | if (restart && !m->exhausted_servers && m->poll_interval_usec > 0) { |
63463bf0 | 860 | log_debug("Waiting after exhausting servers."); |
ba4e0427 | 861 | r = sd_event_add_time_relative(m->event, &m->event_retry, CLOCK_BOOTTIME, m->poll_interval_usec, 0, manager_retry_connect, m); |
f647962d MS |
862 | if (r < 0) |
863 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
63463bf0 ML |
864 | |
865 | m->exhausted_servers = true; | |
866 | ||
867 | /* Increase the polling interval */ | |
a4465d0d | 868 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
63463bf0 ML |
869 | m->poll_interval_usec *= 2; |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
874 | m->exhausted_servers = false; | |
875 | ||
874ff7bf | 876 | manager_set_server_name(m, f); |
84e51726 LP |
877 | } |
878 | ||
879 | /* Tell the resolver to reread /etc/resolv.conf, in | |
880 | * case it changed. */ | |
881 | res_init(); | |
882 | ||
874ff7bf LP |
883 | /* Flush out any previously resolved addresses */ |
884 | server_name_flush_addresses(m->current_server_name); | |
885 | ||
886 | log_debug("Resolving %s...", m->current_server_name->string); | |
887 | ||
7082bb05 | 888 | r = resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, NULL, m); |
f647962d MS |
889 | if (r < 0) |
890 | return log_error_errno(r, "Failed to create resolver: %m"); | |
84e51726 LP |
891 | |
892 | return 1; | |
893 | } | |
894 | ||
895 | r = manager_begin(m); | |
896 | if (r < 0) | |
897 | return r; | |
898 | ||
899 | return 1; | |
900 | } | |
901 | ||
84e51726 LP |
902 | void manager_disconnect(Manager *m) { |
903 | assert(m); | |
904 | ||
905 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
906 | ||
907 | m->event_timer = sd_event_source_unref(m->event_timer); | |
908 | ||
f89c4e15 | 909 | manager_listen_stop(m); |
84e51726 | 910 | |
ec75e8e0 | 911 | m->event_clock_watch = sd_event_source_disable_unref(m->event_clock_watch); |
84e51726 LP |
912 | |
913 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
914 | ||
c696878a | 915 | (void) sd_notify(false, "STATUS=Idle."); |
84e51726 LP |
916 | } |
917 | ||
874ff7bf LP |
918 | void manager_flush_server_names(Manager *m, ServerType t) { |
919 | assert(m); | |
920 | ||
921 | if (t == SERVER_SYSTEM) | |
922 | while (m->system_servers) | |
923 | server_name_free(m->system_servers); | |
924 | ||
925 | if (t == SERVER_LINK) | |
926 | while (m->link_servers) | |
927 | server_name_free(m->link_servers); | |
928 | ||
929 | if (t == SERVER_FALLBACK) | |
930 | while (m->fallback_servers) | |
931 | server_name_free(m->fallback_servers); | |
57b82eaa DM |
932 | |
933 | if (t == SERVER_RUNTIME) | |
934 | manager_flush_runtime_servers(m); | |
935 | } | |
936 | ||
937 | void manager_flush_runtime_servers(Manager *m) { | |
938 | assert(m); | |
939 | ||
940 | while (m->runtime_servers) | |
941 | server_name_free(m->runtime_servers); | |
874ff7bf | 942 | } |
84e51726 | 943 | |
75db809a | 944 | Manager* manager_free(Manager *m) { |
84e51726 | 945 | if (!m) |
75db809a | 946 | return NULL; |
84e51726 LP |
947 | |
948 | manager_disconnect(m); | |
874ff7bf LP |
949 | manager_flush_server_names(m, SERVER_SYSTEM); |
950 | manager_flush_server_names(m, SERVER_LINK); | |
57b82eaa | 951 | manager_flush_server_names(m, SERVER_RUNTIME); |
874ff7bf | 952 | manager_flush_server_names(m, SERVER_FALLBACK); |
84e51726 LP |
953 | |
954 | sd_event_source_unref(m->event_retry); | |
955 | ||
956 | sd_event_source_unref(m->network_event_source); | |
957 | sd_network_monitor_unref(m->network_monitor); | |
958 | ||
33e82f3e DI |
959 | sd_event_source_unref(m->event_save_time); |
960 | ||
84e51726 LP |
961 | sd_resolve_unref(m->resolve); |
962 | sd_event_unref(m->event); | |
963 | ||
92e31da1 | 964 | sd_bus_flush_close_unref(m->bus); |
e7dd3947 | 965 | |
57b82eaa DM |
966 | bus_verify_polkit_async_registry_free(m->polkit_registry); |
967 | ||
75db809a | 968 | return mfree(m); |
84e51726 LP |
969 | } |
970 | ||
874ff7bf LP |
971 | static int manager_network_read_link_servers(Manager *m) { |
972 | _cleanup_strv_free_ char **ntp = NULL; | |
3e85ec07 | 973 | bool changed = false; |
874ff7bf LP |
974 | int r; |
975 | ||
84e51726 LP |
976 | assert(m); |
977 | ||
874ff7bf | 978 | r = sd_network_get_ntp(&ntp); |
ba0c011e YW |
979 | if (r < 0) { |
980 | if (r == -ENOMEM) | |
981 | log_oom(); | |
982 | else | |
983 | log_debug_errno(r, "Failed to get link NTP servers: %m"); | |
874ff7bf | 984 | goto clear; |
ba0c011e | 985 | } |
874ff7bf LP |
986 | |
987 | LIST_FOREACH(names, n, m->link_servers) | |
988 | n->marked = true; | |
989 | ||
990 | STRV_FOREACH(i, ntp) { | |
991 | bool found = false; | |
992 | ||
dcb37458 YW |
993 | r = dns_name_is_valid_or_address(*i); |
994 | if (r < 0) { | |
995 | log_error_errno(r, "Failed to check validity of NTP server name or address '%s': %m", *i); | |
996 | goto clear; | |
997 | } else if (r == 0) { | |
998 | log_error("Invalid NTP server name or address, ignoring: %s", *i); | |
999 | continue; | |
1000 | } | |
1001 | ||
874ff7bf LP |
1002 | LIST_FOREACH(names, n, m->link_servers) |
1003 | if (streq(n->string, *i)) { | |
1004 | n->marked = false; | |
1005 | found = true; | |
1006 | break; | |
1007 | } | |
1008 | ||
1009 | if (!found) { | |
1010 | r = server_name_new(m, NULL, SERVER_LINK, *i); | |
ba0c011e YW |
1011 | if (r < 0) { |
1012 | log_oom(); | |
874ff7bf | 1013 | goto clear; |
ba0c011e | 1014 | } |
3e85ec07 YW |
1015 | |
1016 | changed = true; | |
874ff7bf LP |
1017 | } |
1018 | } | |
1019 | ||
80a226b2 | 1020 | LIST_FOREACH(names, n, m->link_servers) |
3e85ec07 | 1021 | if (n->marked) { |
874ff7bf | 1022 | server_name_free(n); |
3e85ec07 YW |
1023 | changed = true; |
1024 | } | |
874ff7bf | 1025 | |
3e85ec07 | 1026 | return changed; |
874ff7bf LP |
1027 | |
1028 | clear: | |
1029 | manager_flush_server_names(m, SERVER_LINK); | |
1030 | return r; | |
84e51726 LP |
1031 | } |
1032 | ||
f1b42a0b DM |
1033 | bool manager_is_connected(Manager *m) { |
1034 | assert(m); | |
1035 | ||
0630eb1b YW |
1036 | /* Return true when the manager is sending a request, resolving a server name, or |
1037 | * in a poll interval. */ | |
1038 | return m->server_socket >= 0 || m->resolve_query || m->event_timer; | |
1039 | } | |
1040 | ||
84e51726 LP |
1041 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
1042 | Manager *m = userdata; | |
3e85ec07 | 1043 | bool changed, connected, online; |
84e51726 LP |
1044 | int r; |
1045 | ||
1046 | assert(m); | |
1047 | ||
1048 | sd_network_monitor_flush(m->network_monitor); | |
1049 | ||
ba0c011e | 1050 | /* When manager_network_read_link_servers() failed, we assume that the servers are changed. */ |
55033662 | 1051 | changed = manager_network_read_link_servers(m); |
874ff7bf | 1052 | |
84e51726 LP |
1053 | /* check if the machine is online */ |
1054 | online = network_is_online(); | |
1055 | ||
1056 | /* check if the client is currently connected */ | |
0630eb1b | 1057 | connected = manager_is_connected(m); |
84e51726 LP |
1058 | |
1059 | if (connected && !online) { | |
1060 | log_info("No network connectivity, watching for changes."); | |
1061 | manager_disconnect(m); | |
1062 | ||
0630eb1b | 1063 | } else if ((!connected || changed) && online) { |
84e51726 LP |
1064 | log_info("Network configuration changed, trying to establish connection."); |
1065 | ||
1066 | if (m->current_server_address) | |
1067 | r = manager_begin(m); | |
1068 | else | |
1069 | r = manager_connect(m); | |
1070 | if (r < 0) | |
1071 | return r; | |
1072 | } | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static int manager_network_monitor_listen(Manager *m) { | |
1078 | int r, fd, events; | |
1079 | ||
1080 | assert(m); | |
1081 | ||
1082 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
36484c03 | 1083 | if (r == -ENOENT) { |
f95b0be7 | 1084 | log_info("systemd does not appear to be running, not listening for systemd-networkd events."); |
36484c03 ZJS |
1085 | return 0; |
1086 | } | |
84e51726 LP |
1087 | if (r < 0) |
1088 | return r; | |
1089 | ||
1090 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
1091 | if (fd < 0) | |
1092 | return fd; | |
1093 | ||
1094 | events = sd_network_monitor_get_events(m->network_monitor); | |
1095 | if (events < 0) | |
1096 | return events; | |
1097 | ||
1098 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, manager_network_event_handler, m); | |
1099 | if (r < 0) | |
1100 | return r; | |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | int manager_new(Manager **ret) { | |
1106 | _cleanup_(manager_freep) Manager *m = NULL; | |
1107 | int r; | |
1108 | ||
1109 | assert(ret); | |
1110 | ||
40c6b514 | 1111 | m = new(Manager, 1); |
84e51726 LP |
1112 | if (!m) |
1113 | return -ENOMEM; | |
1114 | ||
40c6b514 LP |
1115 | *m = (Manager) { |
1116 | .root_distance_max_usec = NTP_ROOT_DISTANCE_MAX_USEC, | |
1117 | .poll_interval_min_usec = NTP_POLL_INTERVAL_MIN_USEC, | |
1118 | .poll_interval_max_usec = NTP_POLL_INTERVAL_MAX_USEC, | |
f907cc16 | 1119 | |
40c6b514 | 1120 | .connection_retry_usec = DEFAULT_CONNECTION_RETRY_USEC, |
e81a44bf | 1121 | |
40c6b514 | 1122 | .server_socket = -1, |
84e51726 | 1123 | |
40c6b514 LP |
1124 | .ratelimit = (RateLimit) { |
1125 | RATELIMIT_INTERVAL_USEC, | |
1126 | RATELIMIT_BURST | |
1127 | }, | |
84e51726 | 1128 | |
40c6b514 LP |
1129 | .save_time_interval_usec = DEFAULT_SAVE_TIME_INTERVAL_USEC, |
1130 | }; | |
33e82f3e | 1131 | |
84e51726 LP |
1132 | r = sd_event_default(&m->event); |
1133 | if (r < 0) | |
1134 | return r; | |
1135 | ||
8b7140db YW |
1136 | (void) sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); |
1137 | (void) sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
84e51726 | 1138 | |
8b7140db | 1139 | (void) sd_event_set_watchdog(m->event, true); |
84e51726 | 1140 | |
b016e77e LP |
1141 | /* Load previous synchronization state */ |
1142 | r = access("/run/systemd/timesync/synchronized", F_OK); | |
1143 | if (r < 0 && errno != ENOENT) | |
1144 | log_debug_errno(errno, "Failed to determine whether /run/systemd/timesync/synchronized exists, ignoring: %m"); | |
1145 | m->synchronized = r >= 0; | |
1146 | ||
84e51726 LP |
1147 | r = sd_resolve_default(&m->resolve); |
1148 | if (r < 0) | |
1149 | return r; | |
1150 | ||
1151 | r = sd_resolve_attach_event(m->resolve, m->event, 0); | |
1152 | if (r < 0) | |
1153 | return r; | |
1154 | ||
1155 | r = manager_network_monitor_listen(m); | |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
ba0c011e | 1159 | (void) manager_network_read_link_servers(m); |
874ff7bf | 1160 | |
1cc6c93a | 1161 | *ret = TAKE_PTR(m); |
84e51726 LP |
1162 | |
1163 | return 0; | |
1164 | } | |
33e82f3e DI |
1165 | |
1166 | static int manager_save_time_handler(sd_event_source *s, uint64_t usec, void *userdata) { | |
1167 | Manager *m = userdata; | |
1168 | ||
1169 | assert(m); | |
1170 | ||
1f129b7f | 1171 | (void) manager_save_time_and_rearm(m, USEC_INFINITY); |
33e82f3e DI |
1172 | return 0; |
1173 | } | |
1174 | ||
1175 | int manager_setup_save_time_event(Manager *m) { | |
1176 | int r; | |
1177 | ||
1178 | assert(m); | |
1179 | assert(!m->event_save_time); | |
1180 | ||
1181 | if (m->save_time_interval_usec == USEC_INFINITY) | |
1182 | return 0; | |
1183 | ||
1184 | /* NB: we'll accumulate scheduling latencies here, but this doesn't matter */ | |
1185 | r = sd_event_add_time_relative( | |
1186 | m->event, &m->event_save_time, | |
ba4e0427 | 1187 | CLOCK_BOOTTIME, |
33e82f3e DI |
1188 | m->save_time_interval_usec, |
1189 | 10 * USEC_PER_SEC, | |
1190 | manager_save_time_handler, m); | |
1191 | if (r < 0) | |
1192 | return log_error_errno(r, "Failed to add save time event: %m"); | |
1193 | ||
1194 | (void) sd_event_source_set_description(m->event_save_time, "save-time"); | |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | ||
1f129b7f | 1199 | static int manager_save_time_and_rearm(Manager *m, usec_t t) { |
33e82f3e DI |
1200 | int r; |
1201 | ||
1202 | assert(m); | |
1203 | ||
1f129b7f LP |
1204 | /* Updates the timestamp file to the specified time. If 't' is USEC_INFINITY uses the current system |
1205 | * clock, but otherwise uses the specified timestamp. Note that whenever we acquire an NTP sync the | |
1206 | * specified timestamp value might be more accurate than the system clock, since the latter is | |
1207 | * subject to slow adjustments. */ | |
1208 | r = touch_file(CLOCK_FILE, false, t, UID_INVALID, GID_INVALID, MODE_INVALID); | |
33e82f3e DI |
1209 | if (r < 0) |
1210 | log_debug_errno(r, "Failed to update " CLOCK_FILE ", ignoring: %m"); | |
1211 | ||
1212 | m->save_on_exit = true; | |
1213 | ||
1214 | if (m->save_time_interval_usec != USEC_INFINITY) { | |
1215 | r = sd_event_source_set_time_relative(m->event_save_time, m->save_time_interval_usec); | |
1216 | if (r < 0) | |
1217 | return log_error_errno(r, "Failed to rearm save time event: %m"); | |
1218 | ||
1219 | r = sd_event_source_set_enabled(m->event_save_time, SD_EVENT_ONESHOT); | |
1220 | if (r < 0) | |
1221 | return log_error_errno(r, "Failed to enable save time event: %m"); | |
1222 | } | |
1223 | ||
1224 | return 0; | |
1225 | } |