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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
84e51726 | 2 | /*** |
0c697941 | 3 | Copyright 2014 Kay Sievers |
84e51726 LP |
4 | ***/ |
5 | ||
84e51726 | 6 | #include <errno.h> |
84e51726 | 7 | #include <math.h> |
84e51726 LP |
8 | #include <netinet/in.h> |
9 | #include <netinet/ip.h> | |
07630cea LP |
10 | #include <resolv.h> |
11 | #include <stdlib.h> | |
12 | #include <sys/socket.h> | |
84e51726 LP |
13 | #include <sys/timerfd.h> |
14 | #include <sys/timex.h> | |
84e51726 | 15 | #include <sys/types.h> |
07630cea LP |
16 | #include <time.h> |
17 | ||
18 | #include "sd-daemon.h" | |
84e51726 | 19 | |
b5efdb8a | 20 | #include "alloc-util.h" |
dcb37458 | 21 | #include "dns-domain.h" |
3ffd4af2 | 22 | #include "fd-util.h" |
f4f15635 | 23 | #include "fs-util.h" |
84e51726 | 24 | #include "list.h" |
07630cea LP |
25 | #include "log.h" |
26 | #include "missing.h" | |
27 | #include "network-util.h" | |
84e51726 | 28 | #include "ratelimit.h" |
07630cea | 29 | #include "socket-util.h" |
07630cea | 30 | #include "string-util.h" |
84e51726 | 31 | #include "strv.h" |
07630cea | 32 | #include "time-util.h" |
84e51726 LP |
33 | #include "timesyncd-conf.h" |
34 | #include "timesyncd-manager.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 | ||
41 | /* expected accuracy of time synchronization; used to adjust the poll interval */ | |
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. */ |
f907cc16 | 52 | #define NTP_MAX_ROOT_DISTANCE (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 RETRY_USEC (30*USEC_PER_SEC) |
58 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) | |
59 | #define RATELIMIT_BURST 10 | |
60 | ||
61 | #define TIMEOUT_USEC (10*USEC_PER_SEC) | |
62 | ||
84e51726 LP |
63 | static int manager_arm_timer(Manager *m, usec_t next); |
64 | static int manager_clock_watch_setup(Manager *m); | |
7b628891 | 65 | static int manager_listen_setup(Manager *m); |
f89c4e15 | 66 | static void manager_listen_stop(Manager *m); |
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 | ||
84e51726 LP |
80 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { |
81 | _cleanup_free_ char *pretty = NULL; | |
82 | Manager *m = userdata; | |
83 | ||
84 | assert(m); | |
85 | assert(m->current_server_name); | |
86 | assert(m->current_server_address); | |
87 | ||
88 | server_address_pretty(m->current_server_address, &pretty); | |
89 | log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string); | |
90 | ||
91 | return manager_connect(m); | |
92 | } | |
93 | ||
94 | static int manager_send_request(Manager *m) { | |
95 | _cleanup_free_ char *pretty = NULL; | |
96 | struct ntp_msg ntpmsg = { | |
97 | /* | |
98 | * "The client initializes the NTP message header, sends the request | |
99 | * to the server, and strips the time of day from the Transmit | |
100 | * Timestamp field of the reply. For this purpose, all the NTP | |
101 | * header fields are set to 0, except the Mode, VN, and optional | |
102 | * Transmit Timestamp fields." | |
103 | */ | |
104 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
105 | }; | |
106 | ssize_t len; | |
107 | int r; | |
108 | ||
109 | assert(m); | |
110 | assert(m->current_server_name); | |
111 | assert(m->current_server_address); | |
112 | ||
113 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
114 | ||
f89c4e15 LP |
115 | r = manager_listen_setup(m); |
116 | if (r < 0) | |
117 | return log_warning_errno(r, "Failed to setup connection socket: %m"); | |
7b628891 | 118 | |
84e51726 LP |
119 | /* |
120 | * Set transmit timestamp, remember it; the server will send that back | |
121 | * as the origin timestamp and we have an indication that this is the | |
122 | * matching answer to our request. | |
123 | * | |
124 | * The actual value does not matter, We do not care about the correct | |
125 | * NTP UINT_MAX fraction; we just pass the plain nanosecond value. | |
126 | */ | |
127 | assert_se(clock_gettime(clock_boottime_or_monotonic(), &m->trans_time_mon) >= 0); | |
128 | assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0); | |
129 | ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970); | |
130 | ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec); | |
131 | ||
132 | server_address_pretty(m->current_server_address, &pretty); | |
133 | ||
134 | len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen); | |
135 | if (len == sizeof(ntpmsg)) { | |
136 | m->pending = true; | |
137 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); | |
138 | } else { | |
56f64d95 | 139 | log_debug_errno(errno, "Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); |
84e51726 LP |
140 | return manager_connect(m); |
141 | } | |
142 | ||
ab4df227 KS |
143 | /* re-arm timer with increasing timeout, in case the packets never arrive back */ |
144 | if (m->retry_interval > 0) { | |
a4465d0d | 145 | if (m->retry_interval < m->poll_interval_max_usec) |
ab4df227 KS |
146 | m->retry_interval *= 2; |
147 | } else | |
a4465d0d | 148 | m->retry_interval = m->poll_interval_min_usec; |
ab4df227 KS |
149 | |
150 | r = manager_arm_timer(m, m->retry_interval); | |
f647962d MS |
151 | if (r < 0) |
152 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
ab4df227 | 153 | |
e8206972 ML |
154 | m->missed_replies++; |
155 | if (m->missed_replies > NTP_MAX_MISSED_REPLIES) { | |
156 | r = sd_event_add_time( | |
157 | m->event, | |
158 | &m->event_timeout, | |
159 | clock_boottime_or_monotonic(), | |
160 | now(clock_boottime_or_monotonic()) + TIMEOUT_USEC, 0, | |
161 | manager_timeout, m); | |
f647962d MS |
162 | if (r < 0) |
163 | return log_error_errno(r, "Failed to arm timeout timer: %m"); | |
84e51726 LP |
164 | } |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { | |
170 | Manager *m = userdata; | |
171 | ||
172 | assert(m); | |
173 | ||
174 | return manager_send_request(m); | |
175 | } | |
176 | ||
177 | static int manager_arm_timer(Manager *m, usec_t next) { | |
178 | int r; | |
179 | ||
180 | assert(m); | |
84e51726 LP |
181 | |
182 | if (next == 0) { | |
183 | m->event_timer = sd_event_source_unref(m->event_timer); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | if (m->event_timer) { | |
188 | r = sd_event_source_set_time(m->event_timer, now(clock_boottime_or_monotonic()) + next); | |
189 | if (r < 0) | |
190 | return r; | |
191 | ||
192 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); | |
193 | } | |
194 | ||
195 | return sd_event_add_time( | |
196 | m->event, | |
197 | &m->event_timer, | |
198 | clock_boottime_or_monotonic(), | |
199 | now(clock_boottime_or_monotonic()) + next, 0, | |
200 | manager_timer, m); | |
201 | } | |
202 | ||
203 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
204 | Manager *m = userdata; | |
205 | ||
206 | assert(m); | |
207 | ||
208 | /* rearm timer */ | |
209 | manager_clock_watch_setup(m); | |
210 | ||
211 | /* skip our own jumps */ | |
212 | if (m->jumped) { | |
213 | m->jumped = false; | |
214 | return 0; | |
215 | } | |
216 | ||
217 | /* resync */ | |
7e3254b3 | 218 | log_debug("System time changed. Resyncing."); |
84e51726 LP |
219 | m->poll_resync = true; |
220 | ||
221 | return manager_send_request(m); | |
222 | } | |
223 | ||
224 | /* wake up when the system time changes underneath us */ | |
225 | static int manager_clock_watch_setup(Manager *m) { | |
84e51726 LP |
226 | int r; |
227 | ||
228 | assert(m); | |
229 | ||
230 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
231 | safe_close(m->clock_watch_fd); | |
232 | ||
4f811d27 | 233 | m->clock_watch_fd = time_change_fd(); |
4a62c710 | 234 | if (m->clock_watch_fd < 0) |
4f811d27 | 235 | return log_error_errno(m->clock_watch_fd, "Failed to create timerfd: %m"); |
84e51726 LP |
236 | |
237 | r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m); | |
f647962d MS |
238 | if (r < 0) |
239 | return log_error_errno(r, "Failed to create clock watch event source: %m"); | |
84e51726 LP |
240 | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { | |
245 | struct timex tmx = {}; | |
246 | int r; | |
247 | ||
248 | assert(m); | |
249 | ||
250 | /* | |
251 | * For small deltas, tell the kernel to gradually adjust the system | |
252 | * clock to the NTP time, larger deltas are just directly set. | |
253 | */ | |
254 | if (fabs(offset) < NTP_MAX_ADJUST) { | |
255 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR; | |
256 | tmx.status = STA_PLL; | |
257 | tmx.offset = offset * NSEC_PER_SEC; | |
258 | tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4; | |
259 | tmx.maxerror = 0; | |
260 | tmx.esterror = 0; | |
ff49bc32 | 261 | log_debug(" adjust (slew): %+.3f sec", offset); |
84e51726 | 262 | } else { |
5f36e3d3 | 263 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_SETOFFSET | ADJ_MAXERROR | ADJ_ESTERROR; |
84e51726 LP |
264 | |
265 | /* ADJ_NANO uses nanoseconds in the microseconds field */ | |
266 | tmx.time.tv_sec = (long)offset; | |
267 | tmx.time.tv_usec = (offset - tmx.time.tv_sec) * NSEC_PER_SEC; | |
5f36e3d3 AK |
268 | tmx.maxerror = 0; |
269 | tmx.esterror = 0; | |
84e51726 LP |
270 | |
271 | /* the kernel expects -0.3s as {-1, 7000.000.000} */ | |
272 | if (tmx.time.tv_usec < 0) { | |
273 | tmx.time.tv_sec -= 1; | |
274 | tmx.time.tv_usec += NSEC_PER_SEC; | |
275 | } | |
276 | ||
277 | m->jumped = true; | |
ff49bc32 | 278 | log_debug(" adjust (jump): %+.3f sec", offset); |
84e51726 LP |
279 | } |
280 | ||
281 | /* | |
282 | * An unset STA_UNSYNC will enable the kernel's 11-minute mode, | |
283 | * which syncs the system time periodically to the RTC. | |
284 | * | |
285 | * In case the RTC runs in local time, never touch the RTC, | |
286 | * we have no way to properly handle daylight saving changes and | |
287 | * mobile devices moving between time zones. | |
288 | */ | |
289 | if (m->rtc_local_time) | |
290 | tmx.status |= STA_UNSYNC; | |
291 | ||
292 | switch (leap_sec) { | |
293 | case 1: | |
294 | tmx.status |= STA_INS; | |
295 | break; | |
296 | case -1: | |
297 | tmx.status |= STA_DEL; | |
298 | break; | |
299 | } | |
300 | ||
301 | r = clock_adjtime(CLOCK_REALTIME, &tmx); | |
302 | if (r < 0) | |
6ff6f4d8 | 303 | return -errno; |
84e51726 | 304 | |
baa33e79 | 305 | /* If touch fails, there isn't much we can do. Maybe it'll work next time. */ |
53d133ea | 306 | (void) touch("/var/lib/systemd/timesync/clock"); |
2dd79846 | 307 | (void) touch("/run/systemd/timesync/synchronized"); |
84e51726 | 308 | |
66086a40 | 309 | m->drift_freq = tmx.freq; |
84e51726 LP |
310 | |
311 | log_debug(" status : %04i %s\n" | |
0060bb8f | 312 | " time now : %"PRI_TIME".%03"PRI_USEC"\n" |
3bd7ef83 | 313 | " constant : %"PRI_TIMEX"\n" |
84e51726 | 314 | " offset : %+.3f sec\n" |
66086a40 | 315 | " freq offset : %+"PRI_TIMEX" (%+"PRI_TIMEX" ppm)\n", |
84e51726 | 316 | tmx.status, tmx.status & STA_UNSYNC ? "unsync" : "sync", |
70887c5f | 317 | tmx.time.tv_sec, tmx.time.tv_usec / NSEC_PER_MSEC, |
84e51726 LP |
318 | tmx.constant, |
319 | (double)tmx.offset / NSEC_PER_SEC, | |
66086a40 | 320 | tmx.freq, tmx.freq / 65536); |
84e51726 LP |
321 | |
322 | return 0; | |
323 | } | |
324 | ||
325 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { | |
326 | unsigned int i, idx_cur, idx_new, idx_min; | |
327 | double jitter; | |
328 | double j; | |
329 | ||
330 | assert(m); | |
331 | ||
332 | m->packet_count++; | |
333 | ||
334 | /* ignore initial sample */ | |
335 | if (m->packet_count == 1) | |
336 | return false; | |
337 | ||
338 | /* store the current data in our samples array */ | |
339 | idx_cur = m->samples_idx; | |
340 | idx_new = (idx_cur + 1) % ELEMENTSOF(m->samples); | |
341 | m->samples_idx = idx_new; | |
342 | m->samples[idx_new].offset = offset; | |
343 | m->samples[idx_new].delay = delay; | |
344 | ||
345 | /* calculate new jitter value from the RMS differences relative to the lowest delay sample */ | |
346 | jitter = m->samples_jitter; | |
347 | for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(m->samples); i++) | |
348 | if (m->samples[i].delay > 0 && m->samples[i].delay < m->samples[idx_min].delay) | |
349 | idx_min = i; | |
350 | ||
351 | j = 0; | |
352 | for (i = 0; i < ELEMENTSOF(m->samples); i++) | |
fa66b606 | 353 | j += pow(m->samples[i].offset - m->samples[idx_min].offset, 2); |
84e51726 LP |
354 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); |
355 | ||
356 | /* ignore samples when resyncing */ | |
357 | if (m->poll_resync) | |
358 | return false; | |
359 | ||
360 | /* always accept offset if we are farther off than the round-trip delay */ | |
361 | if (fabs(offset) > delay) | |
362 | return false; | |
363 | ||
364 | /* we need a few samples before looking at them */ | |
365 | if (m->packet_count < 4) | |
366 | return false; | |
367 | ||
368 | /* do not accept anything worse than the maximum possible error of the best sample */ | |
369 | if (fabs(offset) > m->samples[idx_min].delay) | |
370 | return true; | |
371 | ||
372 | /* compare the difference between the current offset to the previous offset and jitter */ | |
373 | return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter; | |
374 | } | |
375 | ||
376 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { | |
377 | assert(m); | |
378 | ||
379 | if (m->poll_resync) { | |
a4465d0d | 380 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
381 | m->poll_resync = false; |
382 | return; | |
383 | } | |
384 | ||
385 | /* set to minimal poll interval */ | |
386 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { | |
a4465d0d | 387 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
388 | return; |
389 | } | |
390 | ||
391 | /* increase polling interval */ | |
392 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { | |
a4465d0d | 393 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
84e51726 LP |
394 | m->poll_interval_usec *= 2; |
395 | return; | |
396 | } | |
397 | ||
398 | /* decrease polling interval */ | |
399 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { | |
a4465d0d | 400 | if (m->poll_interval_usec > m->poll_interval_min_usec) |
84e51726 LP |
401 | m->poll_interval_usec /= 2; |
402 | return; | |
403 | } | |
404 | } | |
405 | ||
406 | static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
407 | Manager *m = userdata; | |
408 | struct ntp_msg ntpmsg; | |
409 | ||
410 | struct iovec iov = { | |
411 | .iov_base = &ntpmsg, | |
412 | .iov_len = sizeof(ntpmsg), | |
413 | }; | |
414 | union { | |
415 | struct cmsghdr cmsghdr; | |
416 | uint8_t buf[CMSG_SPACE(sizeof(struct timeval))]; | |
417 | } control; | |
418 | union sockaddr_union server_addr; | |
419 | struct msghdr msghdr = { | |
420 | .msg_iov = &iov, | |
421 | .msg_iovlen = 1, | |
422 | .msg_control = &control, | |
423 | .msg_controllen = sizeof(control), | |
424 | .msg_name = &server_addr, | |
425 | .msg_namelen = sizeof(server_addr), | |
426 | }; | |
427 | struct cmsghdr *cmsg; | |
1cc6c93a | 428 | struct timespec *recv_time = NULL; |
84e51726 LP |
429 | ssize_t len; |
430 | double origin, receive, trans, dest; | |
431 | double delay, offset; | |
3af0442c | 432 | double root_distance; |
84e51726 LP |
433 | bool spike; |
434 | int leap_sec; | |
435 | int r; | |
436 | ||
437 | assert(source); | |
438 | assert(m); | |
439 | ||
440 | if (revents & (EPOLLHUP|EPOLLERR)) { | |
441 | log_warning("Server connection returned error."); | |
442 | return manager_connect(m); | |
443 | } | |
444 | ||
a38d9945 | 445 | len = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
84e51726 LP |
446 | if (len < 0) { |
447 | if (errno == EAGAIN) | |
448 | return 0; | |
449 | ||
450 | log_warning("Error receiving message. Disconnecting."); | |
451 | return manager_connect(m); | |
452 | } | |
453 | ||
43fcd650 TM |
454 | /* Too short or too long packet? */ |
455 | if (iov.iov_len < sizeof(struct ntp_msg) || (msghdr.msg_flags & MSG_TRUNC)) { | |
84e51726 LP |
456 | log_warning("Invalid response from server. Disconnecting."); |
457 | return manager_connect(m); | |
458 | } | |
459 | ||
460 | if (!m->current_server_name || | |
461 | !m->current_server_address || | |
462 | !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) { | |
463 | log_debug("Response from unknown server."); | |
464 | return 0; | |
465 | } | |
466 | ||
2a1288ff | 467 | CMSG_FOREACH(cmsg, &msghdr) { |
84e51726 LP |
468 | if (cmsg->cmsg_level != SOL_SOCKET) |
469 | continue; | |
470 | ||
471 | switch (cmsg->cmsg_type) { | |
487a3682 ML |
472 | case SCM_TIMESTAMPNS: |
473 | recv_time = (struct timespec *) CMSG_DATA(cmsg); | |
84e51726 LP |
474 | break; |
475 | } | |
476 | } | |
477 | if (!recv_time) { | |
478 | log_error("Invalid packet timestamp."); | |
479 | return -EINVAL; | |
480 | } | |
481 | ||
482 | if (!m->pending) { | |
483 | log_debug("Unexpected reply. Ignoring."); | |
484 | return 0; | |
485 | } | |
486 | ||
e8206972 ML |
487 | m->missed_replies = 0; |
488 | ||
84e51726 LP |
489 | /* check our "time cookie" (we just stored nanoseconds in the fraction field) */ |
490 | if (be32toh(ntpmsg.origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 || | |
edd50d5e | 491 | be32toh(ntpmsg.origin_time.frac) != (unsigned long) m->trans_time.tv_nsec) { |
84e51726 LP |
492 | log_debug("Invalid reply; not our transmit time. Ignoring."); |
493 | return 0; | |
494 | } | |
495 | ||
496 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
497 | ||
498 | if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 || | |
499 | be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) { | |
500 | log_debug("Invalid reply, returned times before epoch. Ignoring."); | |
501 | return manager_connect(m); | |
502 | } | |
503 | ||
07610e10 ML |
504 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC || |
505 | ntpmsg.stratum == 0 || ntpmsg.stratum >= 16) { | |
84e51726 LP |
506 | log_debug("Server is not synchronized. Disconnecting."); |
507 | return manager_connect(m); | |
508 | } | |
509 | ||
510 | if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) { | |
511 | log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field)); | |
512 | return manager_connect(m); | |
513 | } | |
514 | ||
515 | if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) { | |
516 | log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field)); | |
517 | return manager_connect(m); | |
518 | } | |
519 | ||
3af0442c | 520 | root_distance = ntp_ts_short_to_d(&ntpmsg.root_delay) / 2 + ntp_ts_short_to_d(&ntpmsg.root_dispersion); |
f907cc16 | 521 | if (root_distance > (double) m->max_root_distance_usec / (double) USEC_PER_SEC) { |
3af0442c ML |
522 | log_debug("Server has too large root distance. Disconnecting."); |
523 | return manager_connect(m); | |
524 | } | |
525 | ||
84e51726 LP |
526 | /* valid packet */ |
527 | m->pending = false; | |
ab4df227 | 528 | m->retry_interval = 0; |
84e51726 | 529 | |
7b628891 | 530 | /* Stop listening */ |
f89c4e15 | 531 | manager_listen_stop(m); |
7b628891 | 532 | |
84e51726 LP |
533 | /* announce leap seconds */ |
534 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) | |
535 | leap_sec = 1; | |
536 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) | |
537 | leap_sec = -1; | |
538 | else | |
539 | leap_sec = 0; | |
540 | ||
541 | /* | |
542 | * "Timestamp Name ID When Generated | |
543 | * ------------------------------------------------------------ | |
544 | * Originate Timestamp T1 time request sent by client | |
545 | * Receive Timestamp T2 time request received by server | |
546 | * Transmit Timestamp T3 time reply sent by server | |
547 | * Destination Timestamp T4 time reply received by client | |
548 | * | |
549 | * The round-trip delay, d, and system clock offset, t, are defined as: | |
550 | * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2" | |
551 | */ | |
73c76e63 | 552 | origin = ts_to_d(&m->trans_time) + OFFSET_1900_1970; |
84e51726 LP |
553 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
554 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
487a3682 | 555 | dest = ts_to_d(recv_time) + OFFSET_1900_1970; |
84e51726 LP |
556 | |
557 | offset = ((receive - origin) + (trans - dest)) / 2; | |
558 | delay = (dest - origin) - (trans - receive); | |
559 | ||
560 | spike = manager_sample_spike_detection(m, offset, delay); | |
561 | ||
562 | manager_adjust_poll(m, offset, spike); | |
563 | ||
564 | log_debug("NTP response:\n" | |
565 | " leap : %u\n" | |
566 | " version : %u\n" | |
567 | " mode : %u\n" | |
568 | " stratum : %u\n" | |
569 | " precision : %.6f sec (%d)\n" | |
3af0442c | 570 | " root distance: %.6f sec\n" |
84e51726 LP |
571 | " reference : %.4s\n" |
572 | " origin : %.3f\n" | |
573 | " receive : %.3f\n" | |
574 | " transmit : %.3f\n" | |
575 | " dest : %.3f\n" | |
576 | " offset : %+.3f sec\n" | |
577 | " delay : %+.3f sec\n" | |
578 | " packet count : %"PRIu64"\n" | |
579 | " jitter : %.3f%s\n" | |
580 | " poll interval: " USEC_FMT "\n", | |
581 | NTP_FIELD_LEAP(ntpmsg.field), | |
582 | NTP_FIELD_VERSION(ntpmsg.field), | |
583 | NTP_FIELD_MODE(ntpmsg.field), | |
584 | ntpmsg.stratum, | |
585 | exp2(ntpmsg.precision), ntpmsg.precision, | |
3af0442c | 586 | root_distance, |
84e51726 LP |
587 | ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a", |
588 | origin - OFFSET_1900_1970, | |
589 | receive - OFFSET_1900_1970, | |
590 | trans - OFFSET_1900_1970, | |
591 | dest - OFFSET_1900_1970, | |
592 | offset, delay, | |
593 | m->packet_count, | |
594 | m->samples_jitter, spike ? " spike" : "", | |
595 | m->poll_interval_usec / USEC_PER_SEC); | |
596 | ||
597 | if (!spike) { | |
598 | m->sync = true; | |
599 | r = manager_adjust_clock(m, offset, leap_sec); | |
600 | if (r < 0) | |
6ff6f4d8 | 601 | log_error_errno(r, "Failed to call clock_adjtime(): %m"); |
84e51726 LP |
602 | } |
603 | ||
66086a40 YW |
604 | /* Save NTP response */ |
605 | m->ntpmsg = ntpmsg; | |
606 | m->origin_time = m->trans_time; | |
607 | m->dest_time = *recv_time; | |
608 | m->spike = spike; | |
609 | ||
610 | log_debug("interval/delta/delay/jitter/drift " USEC_FMT "s/%+.3fs/%.3fs/%.3fs/%+"PRI_TIMEX"ppm%s", | |
611 | m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_freq / 65536, | |
7b5b3fc3 | 612 | spike ? " (ignored)" : ""); |
84e51726 | 613 | |
66086a40 YW |
614 | (void) sd_bus_emit_properties_changed(m->bus, "/org/freedesktop/timesync1", "org.freedesktop.timesync1.Manager", "NTPMessage", NULL); |
615 | ||
481b3f9e LP |
616 | if (!m->good) { |
617 | _cleanup_free_ char *pretty = NULL; | |
618 | ||
619 | m->good = true; | |
620 | ||
621 | server_address_pretty(m->current_server_address, &pretty); | |
622 | log_info("Synchronized to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
623 | sd_notifyf(false, "STATUS=Synchronized to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
624 | } | |
625 | ||
84e51726 | 626 | r = manager_arm_timer(m, m->poll_interval_usec); |
f647962d MS |
627 | if (r < 0) |
628 | return log_error_errno(r, "Failed to rearm timer: %m"); | |
84e51726 LP |
629 | |
630 | return 0; | |
631 | } | |
632 | ||
633 | static int manager_listen_setup(Manager *m) { | |
634 | union sockaddr_union addr = {}; | |
635 | static const int tos = IPTOS_LOWDELAY; | |
636 | static const int on = 1; | |
637 | int r; | |
638 | ||
639 | assert(m); | |
640 | ||
f89c4e15 LP |
641 | if (m->server_socket >= 0) |
642 | return 0; | |
643 | ||
84e51726 LP |
644 | assert(!m->event_receive); |
645 | assert(m->current_server_address); | |
646 | ||
647 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; | |
648 | ||
649 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); | |
650 | if (m->server_socket < 0) | |
651 | return -errno; | |
652 | ||
653 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); | |
654 | if (r < 0) | |
655 | return -errno; | |
656 | ||
487a3682 | 657 | r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMPNS, &on, sizeof(on)); |
84e51726 LP |
658 | if (r < 0) |
659 | return -errno; | |
660 | ||
69f00817 | 661 | (void) setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
84e51726 LP |
662 | |
663 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); | |
664 | } | |
665 | ||
f89c4e15 LP |
666 | static void manager_listen_stop(Manager *m) { |
667 | assert(m); | |
668 | ||
669 | m->event_receive = sd_event_source_unref(m->event_receive); | |
670 | m->server_socket = safe_close(m->server_socket); | |
671 | } | |
672 | ||
84e51726 LP |
673 | static int manager_begin(Manager *m) { |
674 | _cleanup_free_ char *pretty = NULL; | |
675 | int r; | |
676 | ||
677 | assert(m); | |
678 | assert_return(m->current_server_name, -EHOSTUNREACH); | |
679 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
680 | ||
481b3f9e | 681 | m->good = false; |
e8206972 | 682 | m->missed_replies = NTP_MAX_MISSED_REPLIES; |
80cd2606 | 683 | if (m->poll_interval_usec == 0) |
a4465d0d | 684 | m->poll_interval_usec = m->poll_interval_min_usec; |
84e51726 LP |
685 | |
686 | server_address_pretty(m->current_server_address, &pretty); | |
481b3f9e LP |
687 | log_debug("Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); |
688 | sd_notifyf(false, "STATUS=Connecting to time server %s (%s).", strna(pretty), m->current_server_name->string); | |
84e51726 | 689 | |
84e51726 LP |
690 | r = manager_clock_watch_setup(m); |
691 | if (r < 0) | |
692 | return r; | |
693 | ||
694 | return manager_send_request(m); | |
695 | } | |
696 | ||
874ff7bf LP |
697 | void manager_set_server_name(Manager *m, ServerName *n) { |
698 | assert(m); | |
84e51726 | 699 | |
874ff7bf LP |
700 | if (m->current_server_name == n) |
701 | return; | |
84e51726 | 702 | |
874ff7bf LP |
703 | m->current_server_name = n; |
704 | m->current_server_address = NULL; | |
705 | ||
706 | manager_disconnect(m); | |
84e51726 | 707 | |
874ff7bf LP |
708 | if (n) |
709 | log_debug("Selected server %s.", n->string); | |
710 | } | |
84e51726 | 711 | |
874ff7bf | 712 | void manager_set_server_address(Manager *m, ServerAddress *a) { |
84e51726 LP |
713 | assert(m); |
714 | ||
874ff7bf LP |
715 | if (m->current_server_address == a) |
716 | return; | |
717 | ||
874ff7bf | 718 | m->current_server_address = a; |
20f8d3cf SN |
719 | /* If a is NULL, we are just clearing the address, without |
720 | * changing the name. Keep the existing name in that case. */ | |
721 | if (a) | |
722 | m->current_server_name = a->name; | |
874ff7bf LP |
723 | |
724 | manager_disconnect(m); | |
725 | ||
726 | if (a) { | |
727 | _cleanup_free_ char *pretty = NULL; | |
728 | server_address_pretty(a, &pretty); | |
729 | log_debug("Selected address %s of server %s.", strna(pretty), a->name->string); | |
84e51726 LP |
730 | } |
731 | } | |
732 | ||
733 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { | |
734 | Manager *m = userdata; | |
874ff7bf | 735 | int r; |
84e51726 LP |
736 | |
737 | assert(q); | |
738 | assert(m); | |
739 | assert(m->current_server_name); | |
740 | ||
741 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
742 | ||
743 | if (ret != 0) { | |
744 | log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); | |
745 | ||
746 | /* Try next host */ | |
747 | return manager_connect(m); | |
748 | } | |
749 | ||
84e51726 LP |
750 | for (; ai; ai = ai->ai_next) { |
751 | _cleanup_free_ char *pretty = NULL; | |
874ff7bf | 752 | ServerAddress *a; |
84e51726 LP |
753 | |
754 | assert(ai->ai_addr); | |
755 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
84e51726 LP |
756 | |
757 | if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) { | |
758 | log_warning("Unsuitable address protocol for %s", m->current_server_name->string); | |
759 | continue; | |
760 | } | |
761 | ||
874ff7bf | 762 | r = server_address_new(m->current_server_name, &a, (const union sockaddr_union*) ai->ai_addr, ai->ai_addrlen); |
f647962d MS |
763 | if (r < 0) |
764 | return log_error_errno(r, "Failed to add server address: %m"); | |
84e51726 | 765 | |
874ff7bf | 766 | server_address_pretty(a, &pretty); |
84e51726 LP |
767 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
768 | } | |
769 | ||
770 | if (!m->current_server_name->addresses) { | |
771 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
772 | ||
773 | /* Try next host */ | |
774 | return manager_connect(m); | |
775 | } | |
776 | ||
874ff7bf | 777 | manager_set_server_address(m, m->current_server_name->addresses); |
84e51726 LP |
778 | |
779 | return manager_begin(m); | |
780 | } | |
781 | ||
874ff7bf | 782 | static int manager_retry_connect(sd_event_source *source, usec_t usec, void *userdata) { |
84e51726 LP |
783 | Manager *m = userdata; |
784 | ||
785 | assert(m); | |
786 | ||
787 | return manager_connect(m); | |
788 | } | |
789 | ||
790 | int manager_connect(Manager *m) { | |
84e51726 LP |
791 | int r; |
792 | ||
793 | assert(m); | |
794 | ||
795 | manager_disconnect(m); | |
796 | ||
797 | m->event_retry = sd_event_source_unref(m->event_retry); | |
7994ac1d | 798 | if (!ratelimit_below(&m->ratelimit)) { |
84e51726 LP |
799 | log_debug("Slowing down attempts to contact servers."); |
800 | ||
874ff7bf | 801 | 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 |
802 | if (r < 0) |
803 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
84e51726 LP |
804 | |
805 | return 0; | |
806 | } | |
807 | ||
808 | /* If we already are operating on some address, switch to the | |
809 | * next one. */ | |
810 | if (m->current_server_address && m->current_server_address->addresses_next) | |
874ff7bf | 811 | manager_set_server_address(m, m->current_server_address->addresses_next); |
84e51726 | 812 | else { |
874ff7bf LP |
813 | struct addrinfo hints = { |
814 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, | |
815 | .ai_socktype = SOCK_DGRAM, | |
816 | }; | |
84e51726 | 817 | |
874ff7bf | 818 | /* Hmm, we are through all addresses, let's look for the next host instead */ |
84e51726 | 819 | if (m->current_server_name && m->current_server_name->names_next) |
874ff7bf | 820 | manager_set_server_name(m, m->current_server_name->names_next); |
84e51726 | 821 | else { |
874ff7bf | 822 | ServerName *f; |
63463bf0 | 823 | bool restart = true; |
874ff7bf LP |
824 | |
825 | /* Our current server name list is exhausted, | |
826 | * let's find the next one to iterate. First | |
827 | * we try the system list, then the link list. | |
828 | * After having processed the link list we | |
829 | * jump back to the system list. However, if | |
830 | * both lists are empty, we change to the | |
831 | * fallback list. */ | |
832 | if (!m->current_server_name || m->current_server_name->type == SERVER_LINK) { | |
833 | f = m->system_servers; | |
834 | if (!f) | |
835 | f = m->link_servers; | |
836 | } else { | |
837 | f = m->link_servers; | |
838 | if (!f) | |
839 | f = m->system_servers; | |
63463bf0 ML |
840 | else |
841 | restart = false; | |
874ff7bf LP |
842 | } |
843 | ||
844 | if (!f) | |
845 | f = m->fallback_servers; | |
846 | ||
847 | if (!f) { | |
848 | manager_set_server_name(m, NULL); | |
84e51726 LP |
849 | log_debug("No server found."); |
850 | return 0; | |
851 | } | |
852 | ||
63463bf0 ML |
853 | if (restart && !m->exhausted_servers && m->poll_interval_usec) { |
854 | log_debug("Waiting after exhausting servers."); | |
855 | 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 |
856 | if (r < 0) |
857 | return log_error_errno(r, "Failed to create retry timer: %m"); | |
63463bf0 ML |
858 | |
859 | m->exhausted_servers = true; | |
860 | ||
861 | /* Increase the polling interval */ | |
a4465d0d | 862 | if (m->poll_interval_usec < m->poll_interval_max_usec) |
63463bf0 ML |
863 | m->poll_interval_usec *= 2; |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | m->exhausted_servers = false; | |
869 | ||
874ff7bf | 870 | manager_set_server_name(m, f); |
84e51726 LP |
871 | } |
872 | ||
873 | /* Tell the resolver to reread /etc/resolv.conf, in | |
874 | * case it changed. */ | |
875 | res_init(); | |
876 | ||
874ff7bf LP |
877 | /* Flush out any previously resolved addresses */ |
878 | server_name_flush_addresses(m->current_server_name); | |
879 | ||
880 | log_debug("Resolving %s...", m->current_server_name->string); | |
881 | ||
84e51726 | 882 | r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m); |
f647962d MS |
883 | if (r < 0) |
884 | return log_error_errno(r, "Failed to create resolver: %m"); | |
84e51726 LP |
885 | |
886 | return 1; | |
887 | } | |
888 | ||
889 | r = manager_begin(m); | |
890 | if (r < 0) | |
891 | return r; | |
892 | ||
893 | return 1; | |
894 | } | |
895 | ||
84e51726 LP |
896 | void manager_disconnect(Manager *m) { |
897 | assert(m); | |
898 | ||
899 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
900 | ||
901 | m->event_timer = sd_event_source_unref(m->event_timer); | |
902 | ||
f89c4e15 | 903 | manager_listen_stop(m); |
84e51726 LP |
904 | |
905 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); | |
906 | m->clock_watch_fd = safe_close(m->clock_watch_fd); | |
907 | ||
908 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
909 | ||
910 | sd_notifyf(false, "STATUS=Idle."); | |
911 | } | |
912 | ||
874ff7bf LP |
913 | void manager_flush_server_names(Manager *m, ServerType t) { |
914 | assert(m); | |
915 | ||
916 | if (t == SERVER_SYSTEM) | |
917 | while (m->system_servers) | |
918 | server_name_free(m->system_servers); | |
919 | ||
920 | if (t == SERVER_LINK) | |
921 | while (m->link_servers) | |
922 | server_name_free(m->link_servers); | |
923 | ||
924 | if (t == SERVER_FALLBACK) | |
925 | while (m->fallback_servers) | |
926 | server_name_free(m->fallback_servers); | |
927 | } | |
84e51726 LP |
928 | |
929 | void manager_free(Manager *m) { | |
930 | if (!m) | |
931 | return; | |
932 | ||
933 | manager_disconnect(m); | |
874ff7bf LP |
934 | manager_flush_server_names(m, SERVER_SYSTEM); |
935 | manager_flush_server_names(m, SERVER_LINK); | |
936 | manager_flush_server_names(m, SERVER_FALLBACK); | |
84e51726 LP |
937 | |
938 | sd_event_source_unref(m->event_retry); | |
939 | ||
940 | sd_event_source_unref(m->network_event_source); | |
941 | sd_network_monitor_unref(m->network_monitor); | |
942 | ||
943 | sd_resolve_unref(m->resolve); | |
944 | sd_event_unref(m->event); | |
945 | ||
e7dd3947 YW |
946 | sd_bus_unref(m->bus); |
947 | ||
84e51726 LP |
948 | free(m); |
949 | } | |
950 | ||
874ff7bf LP |
951 | static int manager_network_read_link_servers(Manager *m) { |
952 | _cleanup_strv_free_ char **ntp = NULL; | |
953 | ServerName *n, *nx; | |
954 | char **i; | |
3e85ec07 | 955 | bool changed = false; |
874ff7bf LP |
956 | int r; |
957 | ||
84e51726 LP |
958 | assert(m); |
959 | ||
874ff7bf | 960 | r = sd_network_get_ntp(&ntp); |
ba0c011e YW |
961 | if (r < 0) { |
962 | if (r == -ENOMEM) | |
963 | log_oom(); | |
964 | else | |
965 | log_debug_errno(r, "Failed to get link NTP servers: %m"); | |
874ff7bf | 966 | goto clear; |
ba0c011e | 967 | } |
874ff7bf LP |
968 | |
969 | LIST_FOREACH(names, n, m->link_servers) | |
970 | n->marked = true; | |
971 | ||
972 | STRV_FOREACH(i, ntp) { | |
973 | bool found = false; | |
974 | ||
dcb37458 YW |
975 | r = dns_name_is_valid_or_address(*i); |
976 | if (r < 0) { | |
977 | log_error_errno(r, "Failed to check validity of NTP server name or address '%s': %m", *i); | |
978 | goto clear; | |
979 | } else if (r == 0) { | |
980 | log_error("Invalid NTP server name or address, ignoring: %s", *i); | |
981 | continue; | |
982 | } | |
983 | ||
874ff7bf LP |
984 | LIST_FOREACH(names, n, m->link_servers) |
985 | if (streq(n->string, *i)) { | |
986 | n->marked = false; | |
987 | found = true; | |
988 | break; | |
989 | } | |
990 | ||
991 | if (!found) { | |
992 | r = server_name_new(m, NULL, SERVER_LINK, *i); | |
ba0c011e YW |
993 | if (r < 0) { |
994 | log_oom(); | |
874ff7bf | 995 | goto clear; |
ba0c011e | 996 | } |
3e85ec07 YW |
997 | |
998 | changed = true; | |
874ff7bf LP |
999 | } |
1000 | } | |
1001 | ||
1002 | LIST_FOREACH_SAFE(names, n, nx, m->link_servers) | |
3e85ec07 | 1003 | if (n->marked) { |
874ff7bf | 1004 | server_name_free(n); |
3e85ec07 YW |
1005 | changed = true; |
1006 | } | |
874ff7bf | 1007 | |
3e85ec07 | 1008 | return changed; |
874ff7bf LP |
1009 | |
1010 | clear: | |
1011 | manager_flush_server_names(m, SERVER_LINK); | |
1012 | return r; | |
84e51726 LP |
1013 | } |
1014 | ||
0630eb1b YW |
1015 | static bool manager_is_connected(Manager *m) { |
1016 | /* Return true when the manager is sending a request, resolving a server name, or | |
1017 | * in a poll interval. */ | |
1018 | return m->server_socket >= 0 || m->resolve_query || m->event_timer; | |
1019 | } | |
1020 | ||
84e51726 LP |
1021 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
1022 | Manager *m = userdata; | |
3e85ec07 | 1023 | bool changed, connected, online; |
84e51726 LP |
1024 | int r; |
1025 | ||
1026 | assert(m); | |
1027 | ||
1028 | sd_network_monitor_flush(m->network_monitor); | |
1029 | ||
ba0c011e | 1030 | /* When manager_network_read_link_servers() failed, we assume that the servers are changed. */ |
3e85ec07 | 1031 | changed = !!manager_network_read_link_servers(m); |
874ff7bf | 1032 | |
84e51726 LP |
1033 | /* check if the machine is online */ |
1034 | online = network_is_online(); | |
1035 | ||
1036 | /* check if the client is currently connected */ | |
0630eb1b | 1037 | connected = manager_is_connected(m); |
84e51726 LP |
1038 | |
1039 | if (connected && !online) { | |
1040 | log_info("No network connectivity, watching for changes."); | |
1041 | manager_disconnect(m); | |
1042 | ||
0630eb1b | 1043 | } else if ((!connected || changed) && online) { |
84e51726 LP |
1044 | log_info("Network configuration changed, trying to establish connection."); |
1045 | ||
1046 | if (m->current_server_address) | |
1047 | r = manager_begin(m); | |
1048 | else | |
1049 | r = manager_connect(m); | |
1050 | if (r < 0) | |
1051 | return r; | |
1052 | } | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static int manager_network_monitor_listen(Manager *m) { | |
1058 | int r, fd, events; | |
1059 | ||
1060 | assert(m); | |
1061 | ||
1062 | r = sd_network_monitor_new(&m->network_monitor, NULL); | |
36484c03 | 1063 | if (r == -ENOENT) { |
f95b0be7 | 1064 | log_info("systemd does not appear to be running, not listening for systemd-networkd events."); |
36484c03 ZJS |
1065 | return 0; |
1066 | } | |
84e51726 LP |
1067 | if (r < 0) |
1068 | return r; | |
1069 | ||
1070 | fd = sd_network_monitor_get_fd(m->network_monitor); | |
1071 | if (fd < 0) | |
1072 | return fd; | |
1073 | ||
1074 | events = sd_network_monitor_get_events(m->network_monitor); | |
1075 | if (events < 0) | |
1076 | return events; | |
1077 | ||
1078 | r = sd_event_add_io(m->event, &m->network_event_source, fd, events, manager_network_event_handler, m); | |
1079 | if (r < 0) | |
1080 | return r; | |
1081 | ||
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | int manager_new(Manager **ret) { | |
1086 | _cleanup_(manager_freep) Manager *m = NULL; | |
1087 | int r; | |
1088 | ||
1089 | assert(ret); | |
1090 | ||
1091 | m = new0(Manager, 1); | |
1092 | if (!m) | |
1093 | return -ENOMEM; | |
1094 | ||
f907cc16 | 1095 | m->max_root_distance_usec = NTP_MAX_ROOT_DISTANCE; |
a4465d0d YW |
1096 | m->poll_interval_min_usec = NTP_POLL_INTERVAL_MIN_USEC; |
1097 | m->poll_interval_max_usec = NTP_POLL_INTERVAL_MAX_USEC; | |
f907cc16 | 1098 | |
84e51726 LP |
1099 | m->server_socket = m->clock_watch_fd = -1; |
1100 | ||
1101 | RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST); | |
1102 | ||
84e51726 LP |
1103 | r = sd_event_default(&m->event); |
1104 | if (r < 0) | |
1105 | return r; | |
1106 | ||
1107 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
1108 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
1109 | ||
1110 | sd_event_set_watchdog(m->event, true); | |
1111 | ||
1112 | r = sd_resolve_default(&m->resolve); | |
1113 | if (r < 0) | |
1114 | return r; | |
1115 | ||
1116 | r = sd_resolve_attach_event(m->resolve, m->event, 0); | |
1117 | if (r < 0) | |
1118 | return r; | |
1119 | ||
1120 | r = manager_network_monitor_listen(m); | |
1121 | if (r < 0) | |
1122 | return r; | |
1123 | ||
ba0c011e | 1124 | (void) manager_network_read_link_servers(m); |
874ff7bf | 1125 | |
1cc6c93a | 1126 | *ret = TAKE_PTR(m); |
84e51726 LP |
1127 | |
1128 | return 0; | |
1129 | } |