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bcdbbd7e KS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
e8af6973 | 6 | Copyright 2014 Kay Sievers, Lennart Poettering |
bcdbbd7e KS |
7 | |
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
bcdbbd7e KS |
22 | #include <stdlib.h> |
23 | #include <errno.h> | |
24 | #include <fcntl.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <time.h> | |
28 | #include <math.h> | |
29 | #include <arpa/inet.h> | |
30 | #include <netinet/in.h> | |
31 | #include <netinet/ip.h> | |
7b415867 | 32 | #include <sys/timerfd.h> |
bcdbbd7e KS |
33 | #include <sys/timex.h> |
34 | #include <sys/socket.h> | |
05f7fc0f | 35 | #include <resolv.h> |
bcdbbd7e | 36 | |
7b415867 | 37 | #include "missing.h" |
bcdbbd7e KS |
38 | #include "util.h" |
39 | #include "sparse-endian.h" | |
40 | #include "log.h" | |
5f8cfaee | 41 | #include "socket-util.h" |
678522cf | 42 | #include "list.h" |
7a183c4c | 43 | #include "ratelimit.h" |
881c7420 | 44 | #include "strv.h" |
e8af6973 | 45 | #include "conf-parser.h" |
bcdbbd7e | 46 | #include "sd-event.h" |
856a5a7d | 47 | #include "sd-resolve.h" |
687ed123 | 48 | #include "sd-daemon.h" |
e0e5ce23 TG |
49 | #include "sd-network.h" |
50 | #include "event-util.h" | |
51 | #include "network-util.h" | |
e8af6973 | 52 | #include "timesyncd.h" |
bcdbbd7e | 53 | |
7b415867 KS |
54 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
55 | ||
bcdbbd7e KS |
56 | #ifndef ADJ_SETOFFSET |
57 | #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */ | |
58 | #endif | |
59 | ||
42742bf1 KS |
60 | /* expected accuracy of time synchronization; used to adjust the poll interval */ |
61 | #define NTP_ACCURACY_SEC 0.2 | |
bcdbbd7e KS |
62 | |
63 | /* | |
bcdbbd7e KS |
64 | * "A client MUST NOT under any conditions use a poll interval less |
65 | * than 15 seconds." | |
66 | */ | |
42742bf1 | 67 | #define NTP_POLL_INTERVAL_MIN_SEC 32 |
bcdbbd7e | 68 | #define NTP_POLL_INTERVAL_MAX_SEC 2048 |
bcdbbd7e | 69 | |
42742bf1 KS |
70 | /* |
71 | * Maximum delta in seconds which the system clock is gradually adjusted | |
72 | * (slew) to approach the network time. Deltas larger that this are set by | |
73 | * letting the system time jump. The kernel's limit for adjtime is 0.5s. | |
74 | */ | |
75 | #define NTP_MAX_ADJUST 0.4 | |
76 | ||
77 | /* NTP protocol, packet header */ | |
bcdbbd7e KS |
78 | #define NTP_LEAP_PLUSSEC 1 |
79 | #define NTP_LEAP_MINUSSEC 2 | |
80 | #define NTP_LEAP_NOTINSYNC 3 | |
81 | #define NTP_MODE_CLIENT 3 | |
82 | #define NTP_MODE_SERVER 4 | |
83 | #define NTP_FIELD_LEAP(f) (((f) >> 6) & 3) | |
84 | #define NTP_FIELD_VERSION(f) (((f) >> 3) & 7) | |
85 | #define NTP_FIELD_MODE(f) ((f) & 7) | |
86 | #define NTP_FIELD(l, v, m) (((l) << 6) | ((v) << 3) | (m)) | |
87 | ||
88 | /* | |
89 | * "NTP timestamps are represented as a 64-bit unsigned fixed-point number, | |
90 | * in seconds relative to 0h on 1 January 1900." | |
91 | */ | |
92 | #define OFFSET_1900_1970 2208988800UL | |
93 | ||
7a183c4c LP |
94 | #define RETRY_USEC (30*USEC_PER_SEC) |
95 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) | |
becad8f1 | 96 | #define RATELIMIT_BURST 10 |
7a183c4c | 97 | |
16c058ba LP |
98 | #define TIMEOUT_USEC (10*USEC_PER_SEC) |
99 | ||
bcdbbd7e KS |
100 | struct ntp_ts { |
101 | be32_t sec; | |
102 | be32_t frac; | |
103 | } _packed_; | |
104 | ||
105 | struct ntp_ts_short { | |
106 | be16_t sec; | |
107 | be16_t frac; | |
108 | } _packed_; | |
109 | ||
110 | struct ntp_msg { | |
111 | uint8_t field; | |
112 | uint8_t stratum; | |
113 | int8_t poll; | |
114 | int8_t precision; | |
115 | struct ntp_ts_short root_delay; | |
116 | struct ntp_ts_short root_dispersion; | |
117 | char refid[4]; | |
118 | struct ntp_ts reference_time; | |
119 | struct ntp_ts origin_time; | |
120 | struct ntp_ts recv_time; | |
121 | struct ntp_ts trans_time; | |
122 | } _packed_; | |
123 | ||
687ed123 KS |
124 | static void manager_free(Manager *m); |
125 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
126 | #define _cleanup_manager_free_ _cleanup_(manager_freep) | |
127 | ||
856a5a7d LP |
128 | static int manager_arm_timer(Manager *m, usec_t next); |
129 | static int manager_clock_watch_setup(Manager *m); | |
678522cf LP |
130 | static int manager_connect(Manager *m); |
131 | static void manager_disconnect(Manager *m); | |
bcdbbd7e | 132 | |
bcdbbd7e KS |
133 | static double ntp_ts_to_d(const struct ntp_ts *ts) { |
134 | return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX); | |
135 | } | |
136 | ||
bcdbbd7e KS |
137 | static double ts_to_d(const struct timespec *ts) { |
138 | return ts->tv_sec + (1.0e-9 * ts->tv_nsec); | |
139 | } | |
140 | ||
d67006fe KS |
141 | static double tv_to_d(const struct timeval *tv) { |
142 | return tv->tv_sec + (1.0e-6 * tv->tv_usec); | |
bcdbbd7e KS |
143 | } |
144 | ||
145 | static double square(double d) { | |
146 | return d * d; | |
147 | } | |
148 | ||
16c058ba LP |
149 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { |
150 | _cleanup_free_ char *pretty = NULL; | |
151 | Manager *m = userdata; | |
152 | ||
153 | assert(m); | |
154 | assert(m->current_server_name); | |
155 | assert(m->current_server_address); | |
156 | ||
157 | sockaddr_pretty(&m->current_server_address->sockaddr.sa, m->current_server_address->socklen, true, &pretty); | |
158 | log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string); | |
159 | ||
160 | return manager_connect(m); | |
161 | } | |
162 | ||
856a5a7d | 163 | static int manager_send_request(Manager *m) { |
678522cf | 164 | _cleanup_free_ char *pretty = NULL; |
5f8cfaee LP |
165 | struct ntp_msg ntpmsg = { |
166 | /* | |
167 | * "The client initializes the NTP message header, sends the request | |
168 | * to the server, and strips the time of day from the Transmit | |
169 | * Timestamp field of the reply. For this purpose, all the NTP | |
170 | * header fields are set to 0, except the Mode, VN, and optional | |
171 | * Transmit Timestamp fields." | |
172 | */ | |
173 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
174 | }; | |
bcdbbd7e | 175 | ssize_t len; |
678522cf LP |
176 | int r; |
177 | ||
178 | assert(m); | |
179 | assert(m->current_server_name); | |
180 | assert(m->current_server_address); | |
bcdbbd7e | 181 | |
16c058ba LP |
182 | m->event_timeout = sd_event_source_unref(m->event_timeout); |
183 | ||
bcdbbd7e KS |
184 | /* |
185 | * Set transmit timestamp, remember it; the server will send that back | |
186 | * as the origin timestamp and we have an indication that this is the | |
187 | * matching answer to our request. | |
188 | * | |
189 | * The actual value does not matter, We do not care about the correct | |
07a062a7 | 190 | * NTP UINT_MAX fraction; we just pass the plain nanosecond value. |
bcdbbd7e | 191 | */ |
856a5a7d LP |
192 | assert_se(clock_gettime(CLOCK_MONOTONIC, &m->trans_time_mon) >= 0); |
193 | assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0); | |
687ed123 KS |
194 | ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970); |
195 | ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec); | |
bcdbbd7e | 196 | |
16c058ba | 197 | sockaddr_pretty(&m->current_server_address->sockaddr.sa, m->current_server_address->socklen, true, &pretty); |
678522cf LP |
198 | |
199 | len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen); | |
7b415867 | 200 | if (len == sizeof(ntpmsg)) { |
687ed123 | 201 | m->pending = true; |
16c058ba | 202 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); |
becad8f1 | 203 | } else { |
16c058ba | 204 | log_debug("Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); |
becad8f1 LP |
205 | return manager_connect(m); |
206 | } | |
7b415867 | 207 | |
15a224e0 | 208 | /* re-arm timer with increasing timeout, in case the packets never arrive back */ |
687ed123 KS |
209 | if (m->retry_interval > 0) { |
210 | if (m->retry_interval < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) | |
211 | m->retry_interval *= 2; | |
7b415867 | 212 | } else |
687ed123 | 213 | m->retry_interval = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; |
bcdbbd7e | 214 | |
678522cf LP |
215 | r = manager_arm_timer(m, m->retry_interval); |
216 | if (r < 0) { | |
217 | log_error("Failed to rearm timer: %s", strerror(-r)); | |
218 | return r; | |
219 | } | |
220 | ||
16c058ba LP |
221 | r = sd_event_add_time( |
222 | m->event, | |
223 | &m->event_timeout, | |
224 | CLOCK_MONOTONIC, | |
225 | now(CLOCK_MONOTONIC) + TIMEOUT_USEC, 0, | |
226 | manager_timeout, m); | |
227 | if (r < 0) { | |
228 | log_error("Failed to arm timeout timer: %s", strerror(-r)); | |
229 | return r; | |
230 | } | |
231 | ||
678522cf | 232 | return 0; |
bcdbbd7e KS |
233 | } |
234 | ||
856a5a7d | 235 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { |
687ed123 | 236 | Manager *m = userdata; |
bcdbbd7e | 237 | |
687ed123 | 238 | assert(m); |
bcdbbd7e | 239 | |
856a5a7d | 240 | return manager_send_request(m); |
bcdbbd7e KS |
241 | } |
242 | ||
856a5a7d | 243 | static int manager_arm_timer(Manager *m, usec_t next) { |
bcdbbd7e KS |
244 | int r; |
245 | ||
687ed123 KS |
246 | assert(m); |
247 | assert(m->event_receive); | |
bcdbbd7e | 248 | |
7b415867 | 249 | if (next == 0) { |
687ed123 | 250 | m->event_timer = sd_event_source_unref(m->event_timer); |
bcdbbd7e KS |
251 | return 0; |
252 | } | |
253 | ||
687ed123 KS |
254 | if (m->event_timer) { |
255 | r = sd_event_source_set_time(m->event_timer, now(CLOCK_MONOTONIC) + next); | |
bcdbbd7e KS |
256 | if (r < 0) |
257 | return r; | |
258 | ||
687ed123 | 259 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); |
bcdbbd7e KS |
260 | } |
261 | ||
856a5a7d | 262 | return sd_event_add_time( |
687ed123 KS |
263 | m->event, |
264 | &m->event_timer, | |
6a0f1f6d LP |
265 | CLOCK_MONOTONIC, |
266 | now(CLOCK_MONOTONIC) + next, 0, | |
856a5a7d | 267 | manager_timer, m); |
bcdbbd7e KS |
268 | } |
269 | ||
856a5a7d | 270 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
687ed123 | 271 | Manager *m = userdata; |
7b415867 | 272 | |
687ed123 | 273 | assert(m); |
7b415867 KS |
274 | |
275 | /* rearm timer */ | |
856a5a7d | 276 | manager_clock_watch_setup(m); |
7b415867 KS |
277 | |
278 | /* skip our own jumps */ | |
687ed123 KS |
279 | if (m->jumped) { |
280 | m->jumped = false; | |
7b415867 KS |
281 | return 0; |
282 | } | |
283 | ||
284 | /* resync */ | |
07a062a7 | 285 | log_info("System time changed. Resyncing."); |
687ed123 | 286 | m->poll_resync = true; |
856a5a7d | 287 | return manager_send_request(m); |
7b415867 KS |
288 | } |
289 | ||
290 | /* wake up when the system time changes underneath us */ | |
856a5a7d | 291 | static int manager_clock_watch_setup(Manager *m) { |
5f8cfaee LP |
292 | |
293 | struct itimerspec its = { | |
294 | .it_value.tv_sec = TIME_T_MAX | |
295 | }; | |
296 | ||
7b415867 KS |
297 | int r; |
298 | ||
687ed123 | 299 | assert(m); |
7b415867 | 300 | |
856a5a7d | 301 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); |
376cd3b8 | 302 | safe_close(m->clock_watch_fd); |
856a5a7d LP |
303 | |
304 | m->clock_watch_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC); | |
305 | if (m->clock_watch_fd < 0) { | |
7b415867 KS |
306 | log_error("Failed to create timerfd: %m"); |
307 | return -errno; | |
308 | } | |
309 | ||
856a5a7d | 310 | if (timerfd_settime(m->clock_watch_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) { |
7b415867 KS |
311 | log_error("Failed to set up timerfd: %m"); |
312 | return -errno; | |
313 | } | |
314 | ||
856a5a7d | 315 | r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m); |
7b415867 KS |
316 | if (r < 0) { |
317 | log_error("Failed to create clock watch event source: %s", strerror(-r)); | |
318 | return r; | |
319 | } | |
320 | ||
7b415867 KS |
321 | return 0; |
322 | } | |
323 | ||
856a5a7d | 324 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { |
bcdbbd7e KS |
325 | struct timex tmx = {}; |
326 | int r; | |
327 | ||
856a5a7d LP |
328 | assert(m); |
329 | ||
bcdbbd7e KS |
330 | /* |
331 | * For small deltas, tell the kernel to gradually adjust the system | |
332 | * clock to the NTP time, larger deltas are just directly set. | |
333 | * | |
334 | * Clear STA_UNSYNC, it will enable the kernel's 11-minute mode, which | |
335 | * syncs the system time periodically to the hardware clock. | |
336 | */ | |
687ed123 | 337 | if (fabs(offset) < NTP_MAX_ADJUST) { |
d67006fe | 338 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR; |
bcdbbd7e | 339 | tmx.status = STA_PLL; |
d67006fe KS |
340 | tmx.offset = offset * NSEC_PER_SEC; |
341 | tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4; | |
12c0d47c KS |
342 | tmx.maxerror = 0; |
343 | tmx.esterror = 0; | |
d67006fe | 344 | log_debug(" adjust (slew): %+.3f sec\n", offset); |
bcdbbd7e | 345 | } else { |
d67006fe KS |
346 | tmx.modes = ADJ_SETOFFSET | ADJ_NANO; |
347 | ||
348 | /* ADJ_NANO uses nanoseconds in the microseconds field */ | |
349 | tmx.time.tv_sec = (long)offset; | |
350 | tmx.time.tv_usec = (offset - tmx.time.tv_sec) * NSEC_PER_SEC; | |
351 | ||
352 | /* the kernel expects -0.3s as {-1, 7000.000.000} */ | |
353 | if (tmx.time.tv_usec < 0) { | |
ef619194 | 354 | tmx.time.tv_sec -= 1; |
d67006fe KS |
355 | tmx.time.tv_usec += NSEC_PER_SEC; |
356 | } | |
7b415867 | 357 | |
687ed123 | 358 | m->jumped = true; |
d67006fe | 359 | log_debug(" adjust (jump): %+.3f sec\n", offset); |
bcdbbd7e KS |
360 | } |
361 | ||
362 | switch (leap_sec) { | |
363 | case 1: | |
364 | tmx.status |= STA_INS; | |
365 | break; | |
366 | case -1: | |
367 | tmx.status |= STA_DEL; | |
368 | break; | |
369 | } | |
370 | ||
81c36b3f | 371 | r = clock_adjtime(CLOCK_REALTIME, &tmx); |
bcdbbd7e KS |
372 | if (r < 0) |
373 | return r; | |
374 | ||
ef619194 KS |
375 | m->drift_ppm = tmx.freq / 65536; |
376 | ||
bcdbbd7e | 377 | log_debug(" status : %04i %s\n" |
ba9f11dc | 378 | " time now : %li.%03lli\n" |
bcdbbd7e | 379 | " constant : %li\n" |
ba9f11dc | 380 | " offset : %+.3f sec\n" |
d67006fe | 381 | " freq offset : %+li (%i ppm)\n", |
bcdbbd7e | 382 | tmx.status, tmx.status & STA_UNSYNC ? "" : "sync", |
d67006fe | 383 | tmx.time.tv_sec, tmx.time.tv_usec / NSEC_PER_MSEC, |
bcdbbd7e | 384 | tmx.constant, |
d67006fe | 385 | (double)tmx.offset / NSEC_PER_SEC, |
ef619194 | 386 | tmx.freq, m->drift_ppm); |
bcdbbd7e KS |
387 | |
388 | return 0; | |
389 | } | |
390 | ||
856a5a7d | 391 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { |
bcdbbd7e KS |
392 | unsigned int i, idx_cur, idx_new, idx_min; |
393 | double jitter; | |
3dbc7620 | 394 | double j; |
bcdbbd7e | 395 | |
856a5a7d LP |
396 | assert(m); |
397 | ||
687ed123 | 398 | m->packet_count++; |
d8c21348 KS |
399 | |
400 | /* ignore initial sample */ | |
687ed123 | 401 | if (m->packet_count == 1) |
d8c21348 KS |
402 | return false; |
403 | ||
bcdbbd7e | 404 | /* store the current data in our samples array */ |
687ed123 KS |
405 | idx_cur = m->samples_idx; |
406 | idx_new = (idx_cur + 1) % ELEMENTSOF(m->samples); | |
407 | m->samples_idx = idx_new; | |
408 | m->samples[idx_new].offset = offset; | |
409 | m->samples[idx_new].delay = delay; | |
bcdbbd7e | 410 | |
bcdbbd7e | 411 | /* calculate new jitter value from the RMS differences relative to the lowest delay sample */ |
687ed123 KS |
412 | jitter = m->samples_jitter; |
413 | for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(m->samples); i++) | |
414 | if (m->samples[i].delay > 0 && m->samples[i].delay < m->samples[idx_min].delay) | |
bcdbbd7e KS |
415 | idx_min = i; |
416 | ||
3dbc7620 | 417 | j = 0; |
687ed123 KS |
418 | for (i = 0; i < ELEMENTSOF(m->samples); i++) |
419 | j += square(m->samples[i].offset - m->samples[idx_min].offset); | |
420 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); | |
bcdbbd7e | 421 | |
a47b9e62 | 422 | /* ignore samples when resyncing */ |
687ed123 | 423 | if (m->poll_resync) |
a47b9e62 KS |
424 | return false; |
425 | ||
426 | /* always accept offset if we are farther off than the round-trip delay */ | |
427 | if (fabs(offset) > delay) | |
428 | return false; | |
429 | ||
430 | /* we need a few samples before looking at them */ | |
687ed123 | 431 | if (m->packet_count < 4) |
a47b9e62 KS |
432 | return false; |
433 | ||
3dbc7620 | 434 | /* do not accept anything worse than the maximum possible error of the best sample */ |
687ed123 | 435 | if (fabs(offset) > m->samples[idx_min].delay) |
3dbc7620 KS |
436 | return true; |
437 | ||
438 | /* compare the difference between the current offset to the previous offset and jitter */ | |
687ed123 | 439 | return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter; |
bcdbbd7e KS |
440 | } |
441 | ||
856a5a7d LP |
442 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { |
443 | assert(m); | |
444 | ||
687ed123 KS |
445 | if (m->poll_resync) { |
446 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
447 | m->poll_resync = false; | |
7b415867 KS |
448 | return; |
449 | } | |
450 | ||
bcdbbd7e | 451 | /* set to minimal poll interval */ |
18bb8adb | 452 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { |
687ed123 | 453 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; |
bcdbbd7e KS |
454 | return; |
455 | } | |
456 | ||
457 | /* increase polling interval */ | |
3dbc7620 | 458 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { |
687ed123 KS |
459 | if (m->poll_interval_usec < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) |
460 | m->poll_interval_usec *= 2; | |
bcdbbd7e KS |
461 | return; |
462 | } | |
463 | ||
464 | /* decrease polling interval */ | |
3dbc7620 | 465 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { |
687ed123 KS |
466 | if (m->poll_interval_usec > NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC) |
467 | m->poll_interval_usec /= 2; | |
bcdbbd7e KS |
468 | return; |
469 | } | |
470 | } | |
471 | ||
856a5a7d LP |
472 | static bool sockaddr_equal(union sockaddr_union *a, union sockaddr_union *b) { |
473 | assert(a); | |
474 | assert(b); | |
475 | ||
476 | if (a->sa.sa_family != b->sa.sa_family) | |
477 | return false; | |
478 | ||
479 | if (a->sa.sa_family == AF_INET) | |
480 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
481 | ||
482 | if (a->sa.sa_family == AF_INET6) | |
483 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
484 | ||
485 | return false; | |
486 | } | |
487 | ||
488 | static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
687ed123 | 489 | Manager *m = userdata; |
856a5a7d LP |
490 | struct ntp_msg ntpmsg; |
491 | ||
bcdbbd7e | 492 | struct iovec iov = { |
856a5a7d LP |
493 | .iov_base = &ntpmsg, |
494 | .iov_len = sizeof(ntpmsg), | |
bcdbbd7e KS |
495 | }; |
496 | union { | |
497 | struct cmsghdr cmsghdr; | |
498 | uint8_t buf[CMSG_SPACE(sizeof(struct timeval))]; | |
499 | } control; | |
5f8cfaee | 500 | union sockaddr_union server_addr; |
bcdbbd7e KS |
501 | struct msghdr msghdr = { |
502 | .msg_iov = &iov, | |
503 | .msg_iovlen = 1, | |
504 | .msg_control = &control, | |
505 | .msg_controllen = sizeof(control), | |
506 | .msg_name = &server_addr, | |
507 | .msg_namelen = sizeof(server_addr), | |
508 | }; | |
509 | struct cmsghdr *cmsg; | |
3dbc7620 | 510 | struct timespec now_ts; |
bcdbbd7e KS |
511 | struct timeval *recv_time; |
512 | ssize_t len; | |
d2d66d1c | 513 | double origin, receive, trans, dest; |
bcdbbd7e KS |
514 | double delay, offset; |
515 | bool spike; | |
516 | int leap_sec; | |
517 | int r; | |
518 | ||
678522cf LP |
519 | assert(source); |
520 | assert(m); | |
521 | ||
bcdbbd7e | 522 | if (revents & (EPOLLHUP|EPOLLERR)) { |
678522cf LP |
523 | log_warning("Server connection returned error."); |
524 | return manager_connect(m); | |
bcdbbd7e KS |
525 | } |
526 | ||
527 | len = recvmsg(fd, &msghdr, MSG_DONTWAIT); | |
528 | if (len < 0) { | |
856a5a7d LP |
529 | if (errno == EAGAIN) |
530 | return 0; | |
531 | ||
678522cf LP |
532 | log_warning("Error receiving message. Disconnecting."); |
533 | return manager_connect(m); | |
bcdbbd7e KS |
534 | } |
535 | ||
536 | if (iov.iov_len < sizeof(struct ntp_msg)) { | |
678522cf LP |
537 | log_warning("Invalid response from server. Disconnecting."); |
538 | return manager_connect(m); | |
bcdbbd7e KS |
539 | } |
540 | ||
678522cf LP |
541 | if (!m->current_server_name || |
542 | !m->current_server_address || | |
543 | !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) { | |
544 | log_debug("Response from unknown server."); | |
545 | return 0; | |
bcdbbd7e KS |
546 | } |
547 | ||
548 | recv_time = NULL; | |
549 | for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) { | |
550 | if (cmsg->cmsg_level != SOL_SOCKET) | |
551 | continue; | |
552 | ||
553 | switch (cmsg->cmsg_type) { | |
554 | case SCM_TIMESTAMP: | |
555 | recv_time = (struct timeval *) CMSG_DATA(cmsg); | |
556 | break; | |
557 | } | |
558 | } | |
559 | if (!recv_time) { | |
678522cf | 560 | log_error("Invalid packet timestamp."); |
bcdbbd7e KS |
561 | return -EINVAL; |
562 | } | |
563 | ||
687ed123 | 564 | if (!m->pending) { |
07a062a7 | 565 | log_debug("Unexpected reply. Ignoring."); |
bcdbbd7e KS |
566 | return 0; |
567 | } | |
bcdbbd7e KS |
568 | |
569 | /* check our "time cookie" (we just stored nanoseconds in the fraction field) */ | |
856a5a7d LP |
570 | if (be32toh(ntpmsg.origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 || |
571 | be32toh(ntpmsg.origin_time.frac) != m->trans_time.tv_nsec) { | |
07a062a7 | 572 | log_debug("Invalid reply; not our transmit time. Ignoring."); |
bcdbbd7e KS |
573 | return 0; |
574 | } | |
575 | ||
16c058ba LP |
576 | m->event_timeout = sd_event_source_unref(m->event_timeout); |
577 | ||
661278ee LP |
578 | if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 || |
579 | be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) { | |
580 | log_debug("Invalid reply, returned times before epoch. Ignoring."); | |
581 | return manager_connect(m); | |
582 | } | |
583 | ||
856a5a7d | 584 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC) { |
07a062a7 | 585 | log_debug("Server is not synchronized. Disconnecting."); |
678522cf | 586 | return manager_connect(m); |
bcdbbd7e KS |
587 | } |
588 | ||
661278ee | 589 | if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) { |
856a5a7d | 590 | log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field)); |
678522cf | 591 | return manager_connect(m); |
bcdbbd7e KS |
592 | } |
593 | ||
856a5a7d LP |
594 | if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) { |
595 | log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field)); | |
678522cf | 596 | return manager_connect(m); |
bcdbbd7e KS |
597 | } |
598 | ||
7b415867 | 599 | /* valid packet */ |
687ed123 KS |
600 | m->pending = false; |
601 | m->retry_interval = 0; | |
7b415867 | 602 | |
bcdbbd7e | 603 | /* announce leap seconds */ |
856a5a7d | 604 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) |
bcdbbd7e | 605 | leap_sec = 1; |
856a5a7d | 606 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) |
bcdbbd7e KS |
607 | leap_sec = -1; |
608 | else | |
609 | leap_sec = 0; | |
610 | ||
611 | /* | |
612 | * "Timestamp Name ID When Generated | |
613 | * ------------------------------------------------------------ | |
614 | * Originate Timestamp T1 time request sent by client | |
615 | * Receive Timestamp T2 time request received by server | |
616 | * Transmit Timestamp T3 time reply sent by server | |
617 | * Destination Timestamp T4 time reply received by client | |
618 | * | |
07a062a7 | 619 | * The round-trip delay, d, and system clock offset, t, are defined as: |
bcdbbd7e KS |
620 | * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2" |
621 | */ | |
856a5a7d | 622 | assert_se(clock_gettime(CLOCK_MONOTONIC, &now_ts) >= 0); |
687ed123 | 623 | origin = tv_to_d(recv_time) - (ts_to_d(&now_ts) - ts_to_d(&m->trans_time_mon)) + OFFSET_1900_1970; |
856a5a7d LP |
624 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
625 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
bcdbbd7e KS |
626 | dest = tv_to_d(recv_time) + OFFSET_1900_1970; |
627 | ||
d2d66d1c KS |
628 | offset = ((receive - origin) + (trans - dest)) / 2; |
629 | delay = (dest - origin) - (trans - receive); | |
bcdbbd7e | 630 | |
856a5a7d | 631 | spike = manager_sample_spike_detection(m, offset, delay); |
bcdbbd7e | 632 | |
856a5a7d | 633 | manager_adjust_poll(m, offset, spike); |
bcdbbd7e KS |
634 | |
635 | log_debug("NTP response:\n" | |
636 | " leap : %u\n" | |
637 | " version : %u\n" | |
638 | " mode : %u\n" | |
639 | " stratum : %u\n" | |
d67006fe | 640 | " precision : %.6f sec (%d)\n" |
bcdbbd7e | 641 | " reference : %.4s\n" |
ba9f11dc KS |
642 | " origin : %.3f\n" |
643 | " receive : %.3f\n" | |
644 | " transmit : %.3f\n" | |
645 | " dest : %.3f\n" | |
646 | " offset : %+.3f sec\n" | |
647 | " delay : %+.3f sec\n" | |
8fe90522 | 648 | " packet count : %"PRIu64"\n" |
ba9f11dc | 649 | " jitter : %.3f%s\n" |
bcdbbd7e | 650 | " poll interval: %llu\n", |
856a5a7d LP |
651 | NTP_FIELD_LEAP(ntpmsg.field), |
652 | NTP_FIELD_VERSION(ntpmsg.field), | |
653 | NTP_FIELD_MODE(ntpmsg.field), | |
654 | ntpmsg.stratum, | |
655 | exp2(ntpmsg.precision), ntpmsg.precision, | |
656 | ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a", | |
bcdbbd7e | 657 | origin - OFFSET_1900_1970, |
d2d66d1c | 658 | receive - OFFSET_1900_1970, |
bcdbbd7e KS |
659 | trans - OFFSET_1900_1970, |
660 | dest - OFFSET_1900_1970, | |
661 | offset, delay, | |
687ed123 KS |
662 | m->packet_count, |
663 | m->samples_jitter, spike ? " spike" : "", | |
664 | m->poll_interval_usec / USEC_PER_SEC); | |
bcdbbd7e | 665 | |
bcdbbd7e | 666 | if (!spike) { |
856a5a7d | 667 | r = manager_adjust_clock(m, offset, leap_sec); |
bcdbbd7e KS |
668 | if (r < 0) |
669 | log_error("Failed to call clock_adjtime(): %m"); | |
670 | } | |
671 | ||
08937720 KS |
672 | log_info("interval/delta/delay/jitter/drift %llus/%+.3fs/%.3fs/%.3fs/%+ippm%s", |
673 | m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_ppm, | |
ef619194 | 674 | spike ? " (ignored)" : ""); |
bcdbbd7e | 675 | |
678522cf LP |
676 | r = manager_arm_timer(m, m->poll_interval_usec); |
677 | if (r < 0) { | |
678 | log_error("Failed to rearm timer: %s", strerror(-r)); | |
679 | return r; | |
680 | } | |
681 | ||
682 | return 0; | |
bcdbbd7e KS |
683 | } |
684 | ||
856a5a7d LP |
685 | static int manager_listen_setup(Manager *m) { |
686 | union sockaddr_union addr = {}; | |
687 | static const int tos = IPTOS_LOWDELAY; | |
688 | static const int on = 1; | |
689 | int r; | |
bcdbbd7e | 690 | |
687ed123 | 691 | assert(m); |
bcdbbd7e | 692 | |
856a5a7d LP |
693 | assert(m->server_socket < 0); |
694 | assert(!m->event_receive); | |
678522cf | 695 | assert(m->current_server_address); |
bcdbbd7e | 696 | |
678522cf | 697 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; |
bcdbbd7e | 698 | |
856a5a7d LP |
699 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); |
700 | if (m->server_socket < 0) | |
701 | return -errno; | |
bcdbbd7e | 702 | |
678522cf | 703 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); |
856a5a7d LP |
704 | if (r < 0) |
705 | return -errno; | |
706 | ||
707 | r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)); | |
708 | if (r < 0) | |
709 | return -errno; | |
710 | ||
711 | setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); | |
bcdbbd7e | 712 | |
856a5a7d | 713 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); |
bcdbbd7e KS |
714 | } |
715 | ||
678522cf | 716 | static int manager_begin(Manager *m) { |
856a5a7d | 717 | _cleanup_free_ char *pretty = NULL; |
856a5a7d | 718 | int r; |
bcdbbd7e | 719 | |
856a5a7d | 720 | assert(m); |
678522cf LP |
721 | assert_return(m->current_server_name, -EHOSTUNREACH); |
722 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
7b415867 | 723 | |
678522cf | 724 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; |
856a5a7d | 725 | |
16c058ba LP |
726 | sockaddr_pretty(&m->current_server_address->sockaddr.sa, m->current_server_address->socklen, true, &pretty); |
727 | log_info("Using NTP server %s (%s).", strna(pretty), m->current_server_name->string); | |
728 | sd_notifyf(false, "STATUS=Using Time Server %s (%s).", strna(pretty), m->current_server_name->string); | |
856a5a7d LP |
729 | |
730 | r = manager_listen_setup(m); | |
731 | if (r < 0) { | |
732 | log_warning("Failed to setup connection socket: %s", strerror(-r)); | |
733 | return r; | |
734 | } | |
735 | ||
736 | r = manager_clock_watch_setup(m); | |
678522cf | 737 | if (r < 0) |
856a5a7d | 738 | return r; |
856a5a7d LP |
739 | |
740 | return manager_send_request(m); | |
bcdbbd7e KS |
741 | } |
742 | ||
678522cf LP |
743 | static void server_name_flush_addresses(ServerName *n) { |
744 | ServerAddress *a; | |
745 | ||
746 | assert(n); | |
747 | ||
748 | while ((a = n->addresses)) { | |
749 | LIST_REMOVE(addresses, n->addresses, a); | |
750 | free(a); | |
751 | } | |
752 | } | |
753 | ||
754 | static void manager_flush_names(Manager *m) { | |
755 | ServerName *n; | |
756 | ||
757 | assert(m); | |
758 | ||
759 | while ((n = m->servers)) { | |
760 | LIST_REMOVE(names, m->servers, n); | |
761 | free(n->string); | |
762 | server_name_flush_addresses(n); | |
763 | free(n); | |
764 | } | |
765 | } | |
766 | ||
767 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { | |
768 | Manager *m = userdata; | |
769 | ServerAddress *a, *last = NULL; | |
770 | ||
771 | assert(q); | |
772 | assert(m); | |
773 | assert(m->current_server_name); | |
774 | ||
775 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
776 | ||
777 | if (ret != 0) { | |
08937720 | 778 | log_info("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); |
678522cf LP |
779 | |
780 | /* Try next host */ | |
781 | return manager_connect(m); | |
782 | } | |
783 | ||
784 | server_name_flush_addresses(m->current_server_name); | |
785 | ||
786 | for (; ai; ai = ai->ai_next) { | |
787 | _cleanup_free_ char *pretty = NULL; | |
788 | ||
789 | assert(ai->ai_addr); | |
790 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
791 | assert(ai->ai_addrlen <= sizeof(union sockaddr_union)); | |
792 | ||
793 | if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) { | |
794 | log_warning("Unsuitable address protocol for %s", m->current_server_name->string); | |
795 | continue; | |
796 | } | |
797 | ||
798 | a = new0(ServerAddress, 1); | |
799 | if (!a) | |
800 | return log_oom(); | |
801 | ||
802 | memcpy(&a->sockaddr, ai->ai_addr, ai->ai_addrlen); | |
803 | a->socklen = ai->ai_addrlen; | |
804 | ||
805 | LIST_INSERT_AFTER(addresses, m->current_server_name->addresses, last, a); | |
806 | last = a; | |
807 | ||
808 | sockaddr_pretty(&a->sockaddr.sa, a->socklen, true, &pretty); | |
16c058ba | 809 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
678522cf LP |
810 | } |
811 | ||
812 | if (!m->current_server_name->addresses) { | |
813 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
814 | ||
815 | /* Try next host */ | |
816 | return manager_connect(m); | |
817 | } | |
818 | ||
819 | m->current_server_address = m->current_server_name->addresses; | |
820 | ||
821 | return manager_begin(m); | |
822 | } | |
823 | ||
7a183c4c LP |
824 | static int manager_retry(sd_event_source *source, usec_t usec, void *userdata) { |
825 | Manager *m = userdata; | |
826 | ||
827 | assert(m); | |
828 | ||
829 | return manager_connect(m); | |
830 | } | |
831 | ||
678522cf | 832 | static int manager_connect(Manager *m) { |
5f8cfaee | 833 | |
856a5a7d LP |
834 | struct addrinfo hints = { |
835 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, | |
836 | .ai_socktype = SOCK_DGRAM, | |
5f8cfaee | 837 | }; |
678522cf | 838 | int r; |
5f8cfaee | 839 | |
856a5a7d | 840 | assert(m); |
bcdbbd7e | 841 | |
678522cf LP |
842 | manager_disconnect(m); |
843 | ||
7a183c4c LP |
844 | m->event_retry = sd_event_source_unref(m->event_retry); |
845 | if (!ratelimit_test(&m->ratelimit)) { | |
846 | log_debug("Slowing down attempts to contact servers."); | |
847 | ||
848 | r = sd_event_add_time(m->event, &m->event_retry, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + RETRY_USEC, 0, manager_retry, m); | |
849 | if (r < 0) { | |
850 | log_error("Failed to create retry timer: %s", strerror(-r)); | |
851 | return r; | |
852 | } | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
678522cf LP |
857 | /* If we already are operating on some address, switch to the |
858 | * next one. */ | |
859 | if (m->current_server_address && m->current_server_address->addresses_next) | |
860 | m->current_server_address = m->current_server_address->addresses_next; | |
861 | else { | |
862 | /* Hmm, we are through all addresses, let's look for the next host instead */ | |
863 | m->current_server_address = NULL; | |
864 | ||
865 | if (m->current_server_name && m->current_server_name->names_next) | |
866 | m->current_server_name = m->current_server_name->names_next; | |
867 | else { | |
868 | if (!m->servers) { | |
869 | m->current_server_name = NULL; | |
870 | log_debug("No server found."); | |
871 | return 0; | |
872 | } | |
873 | ||
874 | m->current_server_name = m->servers; | |
875 | } | |
876 | ||
05f7fc0f LP |
877 | /* Tell the resolver to reread /etc/resolv.conf, in |
878 | * case it changed. */ | |
879 | res_init(); | |
880 | ||
678522cf LP |
881 | r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m); |
882 | if (r < 0) { | |
883 | log_error("Failed to create resolver: %s", strerror(-r)); | |
884 | return r; | |
885 | } | |
886 | ||
887 | return 1; | |
888 | } | |
889 | ||
890 | r = manager_begin(m); | |
891 | if (r < 0) | |
892 | return r; | |
893 | ||
894 | return 1; | |
895 | } | |
896 | ||
897 | static int manager_add_server(Manager *m, const char *server) { | |
60080921 | 898 | ServerName *n, *tail; |
678522cf LP |
899 | |
900 | assert(m); | |
901 | assert(server); | |
bcdbbd7e | 902 | |
678522cf LP |
903 | n = new0(ServerName, 1); |
904 | if (!n) | |
856a5a7d | 905 | return -ENOMEM; |
bcdbbd7e | 906 | |
678522cf LP |
907 | n->string = strdup(server); |
908 | if (!n->string) { | |
909 | free(n); | |
910 | return -ENOMEM; | |
911 | } | |
bcdbbd7e | 912 | |
376cd3b8 LP |
913 | LIST_FIND_TAIL(names, m->servers, tail); |
914 | LIST_INSERT_AFTER(names, m->servers, tail, n); | |
60080921 | 915 | |
678522cf | 916 | return 0; |
856a5a7d | 917 | } |
bcdbbd7e | 918 | |
e8af6973 LP |
919 | static int manager_add_server_string(Manager *m, const char *string) { |
920 | char *w, *state; | |
921 | size_t l; | |
922 | int r; | |
923 | ||
924 | assert(m); | |
925 | assert(string); | |
926 | ||
927 | FOREACH_WORD_QUOTED(w, l, string, state) { | |
928 | char t[l+1]; | |
929 | ||
930 | memcpy(t, w, l); | |
931 | t[l] = 0; | |
932 | ||
933 | r = manager_add_server(m, t); | |
934 | if (r < 0) | |
935 | log_error("Failed to add server %s to configuration, ignoring: %s", t, strerror(-r)); | |
936 | } | |
937 | ||
938 | return 0; | |
939 | } | |
940 | ||
856a5a7d LP |
941 | static void manager_disconnect(Manager *m) { |
942 | assert(m); | |
bcdbbd7e | 943 | |
856a5a7d | 944 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); |
bcdbbd7e | 945 | |
856a5a7d LP |
946 | m->event_timer = sd_event_source_unref(m->event_timer); |
947 | ||
948 | m->event_receive = sd_event_source_unref(m->event_receive); | |
949 | m->server_socket = safe_close(m->server_socket); | |
950 | ||
856a5a7d LP |
951 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); |
952 | m->clock_watch_fd = safe_close(m->clock_watch_fd); | |
16c058ba LP |
953 | |
954 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
955 | ||
956 | sd_notifyf(false, "STATUS=Idle."); | |
7b415867 KS |
957 | } |
958 | ||
687ed123 KS |
959 | static int manager_new(Manager **ret) { |
960 | _cleanup_manager_free_ Manager *m = NULL; | |
7b415867 KS |
961 | int r; |
962 | ||
687ed123 KS |
963 | m = new0(Manager, 1); |
964 | if (!m) | |
7b415867 KS |
965 | return -ENOMEM; |
966 | ||
856a5a7d LP |
967 | m->server_socket = m->clock_watch_fd = -1; |
968 | ||
7a183c4c LP |
969 | RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST); |
970 | ||
687ed123 | 971 | r = sd_event_default(&m->event); |
7b415867 KS |
972 | if (r < 0) |
973 | return r; | |
974 | ||
856a5a7d LP |
975 | sd_event_add_signal(m->event, &m->sigterm, SIGTERM, NULL, NULL); |
976 | sd_event_add_signal(m->event, &m->sigint, SIGINT, NULL, NULL); | |
977 | ||
978 | r = sd_resolve_default(&m->resolve); | |
7b415867 KS |
979 | if (r < 0) |
980 | return r; | |
981 | ||
856a5a7d LP |
982 | r = sd_resolve_attach_event(m->resolve, m->event, 0); |
983 | if (r < 0) | |
59a9fce4 | 984 | return r; |
856a5a7d LP |
985 | |
986 | r = manager_clock_watch_setup(m); | |
687ed123 KS |
987 | if (r < 0) |
988 | return r; | |
989 | ||
990 | *ret = m; | |
991 | m = NULL; | |
bcdbbd7e KS |
992 | |
993 | return 0; | |
994 | } | |
995 | ||
687ed123 | 996 | static void manager_free(Manager *m) { |
687ed123 KS |
997 | if (!m) |
998 | return; | |
999 | ||
856a5a7d | 1000 | manager_disconnect(m); |
678522cf | 1001 | manager_flush_names(m); |
856a5a7d LP |
1002 | |
1003 | sd_event_source_unref(m->sigint); | |
1004 | sd_event_source_unref(m->sigterm); | |
1005 | ||
7a183c4c LP |
1006 | sd_event_source_unref(m->event_retry); |
1007 | ||
e0e5ce23 TG |
1008 | sd_event_source_unref(m->network_event_source); |
1009 | sd_network_monitor_unref(m->network_monitor); | |
1010 | ||
856a5a7d | 1011 | sd_resolve_unref(m->resolve); |
687ed123 | 1012 | sd_event_unref(m->event); |
856a5a7d | 1013 | |
687ed123 KS |
1014 | free(m); |
1015 | } | |
1016 | ||
e8af6973 LP |
1017 | int config_parse_servers( |
1018 | const char *unit, | |
1019 | const char *filename, | |
1020 | unsigned line, | |
1021 | const char *section, | |
1022 | unsigned section_line, | |
1023 | const char *lvalue, | |
1024 | int ltype, | |
1025 | const char *rvalue, | |
1026 | void *data, | |
1027 | void *userdata) { | |
1028 | ||
1029 | Manager *m = userdata; | |
1030 | ||
1031 | assert(filename); | |
1032 | assert(lvalue); | |
1033 | assert(rvalue); | |
1034 | ||
1035 | manager_flush_names(m); | |
1036 | manager_add_server_string(m, rvalue); | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int manager_parse_config_file(Manager *m) { | |
1042 | static const char fn[] = "/etc/systemd/timesyncd.conf"; | |
1043 | _cleanup_fclose_ FILE *f = NULL; | |
1044 | int r; | |
1045 | ||
1046 | assert(m); | |
1047 | ||
1048 | f = fopen(fn, "re"); | |
1049 | if (!f) { | |
1050 | if (errno == ENOENT) | |
1051 | return 0; | |
1052 | ||
1053 | log_warning("Failed to open configuration file %s: %m", fn); | |
1054 | return -errno; | |
1055 | } | |
1056 | ||
1057 | r = config_parse(NULL, fn, f, "Time\0", config_item_perf_lookup, | |
1058 | (void*) timesyncd_gperf_lookup, false, false, m); | |
1059 | if (r < 0) | |
1060 | log_warning("Failed to parse configuration file: %s", strerror(-r)); | |
1061 | ||
1062 | return r; | |
1063 | } | |
1064 | ||
e0e5ce23 | 1065 | static bool network_is_online(void) { |
9b3310b0 TG |
1066 | _cleanup_free_ char *state = NULL; |
1067 | int r; | |
e0e5ce23 | 1068 | |
9b3310b0 TG |
1069 | r = sd_network_get_operational_state(&state); |
1070 | if (r >= 0 && streq("carrier", state)) | |
1071 | return true; | |
1072 | else | |
e0e5ce23 | 1073 | return false; |
e0e5ce23 TG |
1074 | } |
1075 | ||
1076 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, | |
1077 | void *userdata) { | |
1078 | Manager *m = userdata; | |
1079 | bool connected, online; | |
1080 | int r; | |
1081 | ||
1082 | assert(m); | |
1083 | ||
1084 | /* check if the machine is online */ | |
1085 | online = network_is_online(); | |
1086 | ||
1087 | /* check if the client is currently connected */ | |
1088 | connected = (m->server_socket != -1); | |
1089 | ||
1090 | if (connected && !online) { | |
1091 | log_info("No network connectivity. Suspending."); | |
1092 | manager_disconnect(m); | |
1093 | } else if (!connected && online) { | |
1094 | log_info("Network connectivity detected. Resuming."); | |
1095 | if (m->current_server_address) { | |
1096 | r = manager_begin(m); | |
1097 | if (r < 0) | |
1098 | return r; | |
1099 | } else { | |
1100 | r = manager_connect(m); | |
1101 | if (r < 0) | |
1102 | return r; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | sd_network_monitor_flush(m->network_monitor); | |
1107 | ||
1108 | return 0; | |
1109 | } | |
1110 | ||
1111 | static int manager_network_monitor_listen(Manager *m) { | |
1112 | _cleanup_event_source_unref_ sd_event_source *event_source = NULL; | |
1113 | _cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL; | |
1114 | int r, fd, events; | |
1115 | ||
1116 | r = sd_network_monitor_new(NULL, &monitor); | |
1117 | if (r < 0) | |
1118 | return r; | |
1119 | ||
1120 | fd = sd_network_monitor_get_fd(monitor); | |
1121 | if (fd < 0) | |
1122 | return fd; | |
1123 | ||
1124 | events = sd_network_monitor_get_events(monitor); | |
1125 | if (events < 0) | |
1126 | return events; | |
1127 | ||
1128 | r = sd_event_add_io(m->event, &event_source, fd, events, | |
1129 | &manager_network_event_handler, m); | |
1130 | if (r < 0) | |
1131 | return r; | |
1132 | ||
1133 | m->network_monitor = monitor; | |
1134 | m->network_event_source = event_source; | |
1135 | monitor = NULL; | |
1136 | event_source = NULL; | |
1137 | ||
1138 | return 0; | |
1139 | } | |
1140 | ||
687ed123 KS |
1141 | int main(int argc, char *argv[]) { |
1142 | _cleanup_manager_free_ Manager *m = NULL; | |
687ed123 KS |
1143 | int r; |
1144 | ||
e8af6973 LP |
1145 | if (argc > 1) { |
1146 | log_error("This program does not take arguments."); | |
1147 | return EXIT_FAILURE; | |
1148 | } | |
1149 | ||
687ed123 | 1150 | log_set_target(LOG_TARGET_AUTO); |
e8af6973 | 1151 | log_set_facility(LOG_CRON); |
687ed123 KS |
1152 | log_parse_environment(); |
1153 | log_open(); | |
1154 | ||
e8af6973 LP |
1155 | umask(0022); |
1156 | ||
856a5a7d LP |
1157 | assert_se(sigprocmask_many(SIG_BLOCK, SIGTERM, SIGINT, -1) == 0); |
1158 | ||
687ed123 | 1159 | r = manager_new(&m); |
856a5a7d LP |
1160 | if (r < 0) { |
1161 | log_error("Failed to allocate manager: %s", strerror(-r)); | |
687ed123 | 1162 | goto out; |
856a5a7d | 1163 | } |
687ed123 | 1164 | |
e8af6973 LP |
1165 | manager_add_server_string(m, NTP_SERVERS); |
1166 | manager_parse_config_file(m); | |
687ed123 | 1167 | |
e0e5ce23 TG |
1168 | r = manager_network_monitor_listen(m); |
1169 | if (r < 0) { | |
1170 | log_error("Failed to listen to networkd events: %s", strerror(-r)); | |
1171 | goto out; | |
1172 | } | |
1173 | ||
e8af6973 LP |
1174 | log_debug("systemd-timesyncd running as pid %lu", (unsigned long) getpid()); |
1175 | sd_notify(false, "READY=1"); | |
39594d49 | 1176 | |
e0e5ce23 TG |
1177 | if (network_is_online()) { |
1178 | r = manager_connect(m); | |
1179 | if (r < 0) | |
1180 | goto out; | |
1181 | } | |
678522cf | 1182 | |
687ed123 | 1183 | r = sd_event_loop(m->event); |
856a5a7d LP |
1184 | if (r < 0) { |
1185 | log_error("Failed to run event loop: %s", strerror(-r)); | |
687ed123 | 1186 | goto out; |
856a5a7d LP |
1187 | } |
1188 | ||
1189 | sd_event_get_exit_code(m->event, &r); | |
687ed123 KS |
1190 | |
1191 | out: | |
e8af6973 LP |
1192 | sd_notify(false, "STATUS=Shutting down..."); |
1193 | ||
687ed123 | 1194 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
bcdbbd7e | 1195 | } |