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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> |
a349eb10 LP |
36 | #include <sys/prctl.h> |
37 | #include <sys/types.h> | |
38 | #include <grp.h> | |
bcdbbd7e | 39 | |
7b415867 | 40 | #include "missing.h" |
bcdbbd7e KS |
41 | #include "util.h" |
42 | #include "sparse-endian.h" | |
43 | #include "log.h" | |
5f8cfaee | 44 | #include "socket-util.h" |
678522cf | 45 | #include "list.h" |
7a183c4c | 46 | #include "ratelimit.h" |
881c7420 | 47 | #include "strv.h" |
e8af6973 | 48 | #include "conf-parser.h" |
bcdbbd7e | 49 | #include "sd-event.h" |
856a5a7d | 50 | #include "sd-resolve.h" |
687ed123 | 51 | #include "sd-daemon.h" |
e0e5ce23 TG |
52 | #include "sd-network.h" |
53 | #include "event-util.h" | |
54 | #include "network-util.h" | |
d636d376 | 55 | #include "clock-util.h" |
a349eb10 | 56 | #include "capability.h" |
ece6e766 | 57 | #include "mkdir.h" |
e8af6973 | 58 | #include "timesyncd.h" |
bcdbbd7e | 59 | |
7b415867 KS |
60 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
61 | ||
bcdbbd7e KS |
62 | #ifndef ADJ_SETOFFSET |
63 | #define ADJ_SETOFFSET 0x0100 /* add 'time' to current time */ | |
64 | #endif | |
65 | ||
42742bf1 KS |
66 | /* expected accuracy of time synchronization; used to adjust the poll interval */ |
67 | #define NTP_ACCURACY_SEC 0.2 | |
bcdbbd7e KS |
68 | |
69 | /* | |
bcdbbd7e KS |
70 | * "A client MUST NOT under any conditions use a poll interval less |
71 | * than 15 seconds." | |
72 | */ | |
42742bf1 | 73 | #define NTP_POLL_INTERVAL_MIN_SEC 32 |
bcdbbd7e | 74 | #define NTP_POLL_INTERVAL_MAX_SEC 2048 |
bcdbbd7e | 75 | |
42742bf1 KS |
76 | /* |
77 | * Maximum delta in seconds which the system clock is gradually adjusted | |
78 | * (slew) to approach the network time. Deltas larger that this are set by | |
79 | * letting the system time jump. The kernel's limit for adjtime is 0.5s. | |
80 | */ | |
81 | #define NTP_MAX_ADJUST 0.4 | |
82 | ||
83 | /* NTP protocol, packet header */ | |
bcdbbd7e KS |
84 | #define NTP_LEAP_PLUSSEC 1 |
85 | #define NTP_LEAP_MINUSSEC 2 | |
86 | #define NTP_LEAP_NOTINSYNC 3 | |
87 | #define NTP_MODE_CLIENT 3 | |
88 | #define NTP_MODE_SERVER 4 | |
89 | #define NTP_FIELD_LEAP(f) (((f) >> 6) & 3) | |
90 | #define NTP_FIELD_VERSION(f) (((f) >> 3) & 7) | |
91 | #define NTP_FIELD_MODE(f) ((f) & 7) | |
92 | #define NTP_FIELD(l, v, m) (((l) << 6) | ((v) << 3) | (m)) | |
93 | ||
94 | /* | |
95 | * "NTP timestamps are represented as a 64-bit unsigned fixed-point number, | |
96 | * in seconds relative to 0h on 1 January 1900." | |
97 | */ | |
98 | #define OFFSET_1900_1970 2208988800UL | |
99 | ||
7a183c4c LP |
100 | #define RETRY_USEC (30*USEC_PER_SEC) |
101 | #define RATELIMIT_INTERVAL_USEC (10*USEC_PER_SEC) | |
becad8f1 | 102 | #define RATELIMIT_BURST 10 |
7a183c4c | 103 | |
16c058ba LP |
104 | #define TIMEOUT_USEC (10*USEC_PER_SEC) |
105 | ||
bcdbbd7e KS |
106 | struct ntp_ts { |
107 | be32_t sec; | |
108 | be32_t frac; | |
109 | } _packed_; | |
110 | ||
111 | struct ntp_ts_short { | |
112 | be16_t sec; | |
113 | be16_t frac; | |
114 | } _packed_; | |
115 | ||
116 | struct ntp_msg { | |
117 | uint8_t field; | |
118 | uint8_t stratum; | |
119 | int8_t poll; | |
120 | int8_t precision; | |
121 | struct ntp_ts_short root_delay; | |
122 | struct ntp_ts_short root_dispersion; | |
123 | char refid[4]; | |
124 | struct ntp_ts reference_time; | |
125 | struct ntp_ts origin_time; | |
126 | struct ntp_ts recv_time; | |
127 | struct ntp_ts trans_time; | |
128 | } _packed_; | |
129 | ||
687ed123 KS |
130 | static void manager_free(Manager *m); |
131 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
132 | #define _cleanup_manager_free_ _cleanup_(manager_freep) | |
133 | ||
856a5a7d LP |
134 | static int manager_arm_timer(Manager *m, usec_t next); |
135 | static int manager_clock_watch_setup(Manager *m); | |
678522cf LP |
136 | static int manager_connect(Manager *m); |
137 | static void manager_disconnect(Manager *m); | |
bcdbbd7e | 138 | |
d636d376 KS |
139 | static double ntp_ts_to_d(const struct ntp_ts *ts) { |
140 | return be32toh(ts->sec) + ((double)be32toh(ts->frac) / UINT_MAX); | |
141 | } | |
142 | ||
143 | static double ts_to_d(const struct timespec *ts) { | |
144 | return ts->tv_sec + (1.0e-9 * ts->tv_nsec); | |
145 | } | |
146 | ||
147 | static double tv_to_d(const struct timeval *tv) { | |
148 | return tv->tv_sec + (1.0e-6 * tv->tv_usec); | |
149 | } | |
150 | ||
151 | static double square(double d) { | |
152 | return d * d; | |
153 | } | |
154 | ||
155 | static int load_clock_timestamp(uid_t uid, gid_t gid) { | |
ece6e766 | 156 | _cleanup_close_ int fd = -1; |
d636d376 KS |
157 | usec_t min = TIME_EPOCH * USEC_PER_SEC; |
158 | usec_t ct; | |
159 | int r; | |
ece6e766 LP |
160 | |
161 | /* Let's try to make sure that the clock is always | |
162 | * monotonically increasing, by saving the clock whenever we | |
163 | * have a new NTP time, or when we shut down, and restoring it | |
164 | * when we start again. This is particularly helpful on | |
165 | * systems lacking a battery backed RTC. We also will adjust | |
166 | * the time to at least the build time of systemd. */ | |
167 | ||
d636d376 KS |
168 | fd = open("/var/lib/systemd/clock", O_RDWR|O_CLOEXEC, 0644); |
169 | if (fd >= 0) { | |
ece6e766 | 170 | struct stat st; |
d636d376 KS |
171 | usec_t stamp; |
172 | ||
173 | /* check if the recorded time is later than the compiled-in one */ | |
174 | r = fstat(fd, &st); | |
175 | if (r >= 0) { | |
176 | stamp = timespec_load(&st.st_mtim); | |
177 | if (stamp > min) | |
178 | min = stamp; | |
ece6e766 LP |
179 | } |
180 | ||
d636d376 KS |
181 | /* Try to fix the access mode, so that we can still |
182 | touch the file after dropping priviliges */ | |
183 | fchmod(fd, 0644); | |
184 | fchown(fd, uid, gid); | |
185 | ||
186 | } else | |
187 | /* create stamp file with the compiled-in date */ | |
188 | touch_file("/var/lib/systemd/clock", true, min, uid, gid, 0644); | |
ece6e766 LP |
189 | |
190 | ct = now(CLOCK_REALTIME); | |
d636d376 | 191 | if (ct < min) { |
ece6e766 | 192 | struct timespec ts; |
d636d376 | 193 | char date[FORMAT_TIMESTAMP_MAX]; |
ece6e766 | 194 | |
d636d376 KS |
195 | log_info("System clock time unset or jumped backwards, restoring from recorded timestamp: %s", |
196 | format_timestamp(date, sizeof(date), min)); | |
ece6e766 | 197 | |
d636d376 KS |
198 | if (clock_settime(CLOCK_REALTIME, timespec_store(&ts, min)) < 0) |
199 | log_error("Failed to restore system clock: %m"); | |
ece6e766 LP |
200 | } |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
16c058ba LP |
205 | static int manager_timeout(sd_event_source *source, usec_t usec, void *userdata) { |
206 | _cleanup_free_ char *pretty = NULL; | |
207 | Manager *m = userdata; | |
208 | ||
209 | assert(m); | |
210 | assert(m->current_server_name); | |
211 | assert(m->current_server_address); | |
212 | ||
ae2db4e7 | 213 | server_address_pretty(m->current_server_address, &pretty); |
16c058ba LP |
214 | log_info("Timed out waiting for reply from %s (%s).", strna(pretty), m->current_server_name->string); |
215 | ||
216 | return manager_connect(m); | |
217 | } | |
218 | ||
856a5a7d | 219 | static int manager_send_request(Manager *m) { |
678522cf | 220 | _cleanup_free_ char *pretty = NULL; |
5f8cfaee LP |
221 | struct ntp_msg ntpmsg = { |
222 | /* | |
223 | * "The client initializes the NTP message header, sends the request | |
224 | * to the server, and strips the time of day from the Transmit | |
225 | * Timestamp field of the reply. For this purpose, all the NTP | |
226 | * header fields are set to 0, except the Mode, VN, and optional | |
227 | * Transmit Timestamp fields." | |
228 | */ | |
229 | .field = NTP_FIELD(0, 4, NTP_MODE_CLIENT), | |
230 | }; | |
bcdbbd7e | 231 | ssize_t len; |
678522cf LP |
232 | int r; |
233 | ||
234 | assert(m); | |
235 | assert(m->current_server_name); | |
236 | assert(m->current_server_address); | |
bcdbbd7e | 237 | |
16c058ba LP |
238 | m->event_timeout = sd_event_source_unref(m->event_timeout); |
239 | ||
bcdbbd7e KS |
240 | /* |
241 | * Set transmit timestamp, remember it; the server will send that back | |
242 | * as the origin timestamp and we have an indication that this is the | |
243 | * matching answer to our request. | |
244 | * | |
245 | * The actual value does not matter, We do not care about the correct | |
07a062a7 | 246 | * NTP UINT_MAX fraction; we just pass the plain nanosecond value. |
bcdbbd7e | 247 | */ |
856a5a7d LP |
248 | assert_se(clock_gettime(CLOCK_MONOTONIC, &m->trans_time_mon) >= 0); |
249 | assert_se(clock_gettime(CLOCK_REALTIME, &m->trans_time) >= 0); | |
687ed123 KS |
250 | ntpmsg.trans_time.sec = htobe32(m->trans_time.tv_sec + OFFSET_1900_1970); |
251 | ntpmsg.trans_time.frac = htobe32(m->trans_time.tv_nsec); | |
bcdbbd7e | 252 | |
ae2db4e7 | 253 | server_address_pretty(m->current_server_address, &pretty); |
678522cf LP |
254 | |
255 | len = sendto(m->server_socket, &ntpmsg, sizeof(ntpmsg), MSG_DONTWAIT, &m->current_server_address->sockaddr.sa, m->current_server_address->socklen); | |
7b415867 | 256 | if (len == sizeof(ntpmsg)) { |
687ed123 | 257 | m->pending = true; |
16c058ba | 258 | log_debug("Sent NTP request to %s (%s).", strna(pretty), m->current_server_name->string); |
becad8f1 | 259 | } else { |
16c058ba | 260 | log_debug("Sending NTP request to %s (%s) failed: %m", strna(pretty), m->current_server_name->string); |
becad8f1 LP |
261 | return manager_connect(m); |
262 | } | |
7b415867 | 263 | |
15a224e0 | 264 | /* re-arm timer with increasing timeout, in case the packets never arrive back */ |
687ed123 KS |
265 | if (m->retry_interval > 0) { |
266 | if (m->retry_interval < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) | |
267 | m->retry_interval *= 2; | |
7b415867 | 268 | } else |
687ed123 | 269 | m->retry_interval = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; |
bcdbbd7e | 270 | |
678522cf LP |
271 | r = manager_arm_timer(m, m->retry_interval); |
272 | if (r < 0) { | |
273 | log_error("Failed to rearm timer: %s", strerror(-r)); | |
274 | return r; | |
275 | } | |
276 | ||
16c058ba LP |
277 | r = sd_event_add_time( |
278 | m->event, | |
279 | &m->event_timeout, | |
280 | CLOCK_MONOTONIC, | |
281 | now(CLOCK_MONOTONIC) + TIMEOUT_USEC, 0, | |
282 | manager_timeout, m); | |
283 | if (r < 0) { | |
284 | log_error("Failed to arm timeout timer: %s", strerror(-r)); | |
285 | return r; | |
286 | } | |
287 | ||
678522cf | 288 | return 0; |
bcdbbd7e KS |
289 | } |
290 | ||
856a5a7d | 291 | static int manager_timer(sd_event_source *source, usec_t usec, void *userdata) { |
687ed123 | 292 | Manager *m = userdata; |
bcdbbd7e | 293 | |
687ed123 | 294 | assert(m); |
bcdbbd7e | 295 | |
856a5a7d | 296 | return manager_send_request(m); |
bcdbbd7e KS |
297 | } |
298 | ||
856a5a7d | 299 | static int manager_arm_timer(Manager *m, usec_t next) { |
bcdbbd7e KS |
300 | int r; |
301 | ||
687ed123 KS |
302 | assert(m); |
303 | assert(m->event_receive); | |
bcdbbd7e | 304 | |
7b415867 | 305 | if (next == 0) { |
687ed123 | 306 | m->event_timer = sd_event_source_unref(m->event_timer); |
bcdbbd7e KS |
307 | return 0; |
308 | } | |
309 | ||
687ed123 KS |
310 | if (m->event_timer) { |
311 | r = sd_event_source_set_time(m->event_timer, now(CLOCK_MONOTONIC) + next); | |
bcdbbd7e KS |
312 | if (r < 0) |
313 | return r; | |
314 | ||
687ed123 | 315 | return sd_event_source_set_enabled(m->event_timer, SD_EVENT_ONESHOT); |
bcdbbd7e KS |
316 | } |
317 | ||
856a5a7d | 318 | return sd_event_add_time( |
687ed123 KS |
319 | m->event, |
320 | &m->event_timer, | |
6a0f1f6d LP |
321 | CLOCK_MONOTONIC, |
322 | now(CLOCK_MONOTONIC) + next, 0, | |
856a5a7d | 323 | manager_timer, m); |
bcdbbd7e KS |
324 | } |
325 | ||
856a5a7d | 326 | static int manager_clock_watch(sd_event_source *source, int fd, uint32_t revents, void *userdata) { |
687ed123 | 327 | Manager *m = userdata; |
7b415867 | 328 | |
687ed123 | 329 | assert(m); |
7b415867 KS |
330 | |
331 | /* rearm timer */ | |
856a5a7d | 332 | manager_clock_watch_setup(m); |
7b415867 KS |
333 | |
334 | /* skip our own jumps */ | |
687ed123 KS |
335 | if (m->jumped) { |
336 | m->jumped = false; | |
7b415867 KS |
337 | return 0; |
338 | } | |
339 | ||
340 | /* resync */ | |
07a062a7 | 341 | log_info("System time changed. Resyncing."); |
687ed123 | 342 | m->poll_resync = true; |
856a5a7d | 343 | return manager_send_request(m); |
7b415867 KS |
344 | } |
345 | ||
346 | /* wake up when the system time changes underneath us */ | |
856a5a7d | 347 | static int manager_clock_watch_setup(Manager *m) { |
5f8cfaee LP |
348 | |
349 | struct itimerspec its = { | |
350 | .it_value.tv_sec = TIME_T_MAX | |
351 | }; | |
352 | ||
7b415867 KS |
353 | int r; |
354 | ||
687ed123 | 355 | assert(m); |
7b415867 | 356 | |
856a5a7d | 357 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); |
376cd3b8 | 358 | safe_close(m->clock_watch_fd); |
856a5a7d LP |
359 | |
360 | m->clock_watch_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC); | |
361 | if (m->clock_watch_fd < 0) { | |
7b415867 KS |
362 | log_error("Failed to create timerfd: %m"); |
363 | return -errno; | |
364 | } | |
365 | ||
856a5a7d | 366 | if (timerfd_settime(m->clock_watch_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) { |
7b415867 KS |
367 | log_error("Failed to set up timerfd: %m"); |
368 | return -errno; | |
369 | } | |
370 | ||
856a5a7d | 371 | r = sd_event_add_io(m->event, &m->event_clock_watch, m->clock_watch_fd, EPOLLIN, manager_clock_watch, m); |
7b415867 KS |
372 | if (r < 0) { |
373 | log_error("Failed to create clock watch event source: %s", strerror(-r)); | |
374 | return r; | |
375 | } | |
376 | ||
7b415867 KS |
377 | return 0; |
378 | } | |
379 | ||
856a5a7d | 380 | static int manager_adjust_clock(Manager *m, double offset, int leap_sec) { |
bcdbbd7e KS |
381 | struct timex tmx = {}; |
382 | int r; | |
383 | ||
856a5a7d LP |
384 | assert(m); |
385 | ||
bcdbbd7e KS |
386 | /* |
387 | * For small deltas, tell the kernel to gradually adjust the system | |
388 | * clock to the NTP time, larger deltas are just directly set. | |
389 | * | |
390 | * Clear STA_UNSYNC, it will enable the kernel's 11-minute mode, which | |
391 | * syncs the system time periodically to the hardware clock. | |
392 | */ | |
687ed123 | 393 | if (fabs(offset) < NTP_MAX_ADJUST) { |
d67006fe | 394 | tmx.modes = ADJ_STATUS | ADJ_NANO | ADJ_OFFSET | ADJ_TIMECONST | ADJ_MAXERROR | ADJ_ESTERROR; |
bcdbbd7e | 395 | tmx.status = STA_PLL; |
d67006fe KS |
396 | tmx.offset = offset * NSEC_PER_SEC; |
397 | tmx.constant = log2i(m->poll_interval_usec / USEC_PER_SEC) - 4; | |
12c0d47c KS |
398 | tmx.maxerror = 0; |
399 | tmx.esterror = 0; | |
d67006fe | 400 | log_debug(" adjust (slew): %+.3f sec\n", offset); |
bcdbbd7e | 401 | } else { |
d67006fe KS |
402 | tmx.modes = ADJ_SETOFFSET | ADJ_NANO; |
403 | ||
404 | /* ADJ_NANO uses nanoseconds in the microseconds field */ | |
405 | tmx.time.tv_sec = (long)offset; | |
406 | tmx.time.tv_usec = (offset - tmx.time.tv_sec) * NSEC_PER_SEC; | |
407 | ||
408 | /* the kernel expects -0.3s as {-1, 7000.000.000} */ | |
409 | if (tmx.time.tv_usec < 0) { | |
ef619194 | 410 | tmx.time.tv_sec -= 1; |
d67006fe KS |
411 | tmx.time.tv_usec += NSEC_PER_SEC; |
412 | } | |
7b415867 | 413 | |
687ed123 | 414 | m->jumped = true; |
d67006fe | 415 | log_debug(" adjust (jump): %+.3f sec\n", offset); |
bcdbbd7e KS |
416 | } |
417 | ||
418 | switch (leap_sec) { | |
419 | case 1: | |
420 | tmx.status |= STA_INS; | |
421 | break; | |
422 | case -1: | |
423 | tmx.status |= STA_DEL; | |
424 | break; | |
425 | } | |
426 | ||
81c36b3f | 427 | r = clock_adjtime(CLOCK_REALTIME, &tmx); |
bcdbbd7e KS |
428 | if (r < 0) |
429 | return r; | |
430 | ||
d636d376 KS |
431 | touch("/var/lib/systemd/clock"); |
432 | ||
ef619194 KS |
433 | m->drift_ppm = tmx.freq / 65536; |
434 | ||
bcdbbd7e | 435 | log_debug(" status : %04i %s\n" |
609e002e | 436 | " time now : %li.%03llu\n" |
bcdbbd7e | 437 | " constant : %li\n" |
ba9f11dc | 438 | " offset : %+.3f sec\n" |
d67006fe | 439 | " freq offset : %+li (%i ppm)\n", |
bcdbbd7e | 440 | tmx.status, tmx.status & STA_UNSYNC ? "" : "sync", |
609e002e | 441 | tmx.time.tv_sec, (unsigned long long) (tmx.time.tv_usec / NSEC_PER_MSEC), |
bcdbbd7e | 442 | tmx.constant, |
d67006fe | 443 | (double)tmx.offset / NSEC_PER_SEC, |
ef619194 | 444 | tmx.freq, m->drift_ppm); |
bcdbbd7e KS |
445 | |
446 | return 0; | |
447 | } | |
448 | ||
856a5a7d | 449 | static bool manager_sample_spike_detection(Manager *m, double offset, double delay) { |
bcdbbd7e KS |
450 | unsigned int i, idx_cur, idx_new, idx_min; |
451 | double jitter; | |
3dbc7620 | 452 | double j; |
bcdbbd7e | 453 | |
856a5a7d LP |
454 | assert(m); |
455 | ||
687ed123 | 456 | m->packet_count++; |
d8c21348 KS |
457 | |
458 | /* ignore initial sample */ | |
687ed123 | 459 | if (m->packet_count == 1) |
d8c21348 KS |
460 | return false; |
461 | ||
bcdbbd7e | 462 | /* store the current data in our samples array */ |
687ed123 KS |
463 | idx_cur = m->samples_idx; |
464 | idx_new = (idx_cur + 1) % ELEMENTSOF(m->samples); | |
465 | m->samples_idx = idx_new; | |
466 | m->samples[idx_new].offset = offset; | |
467 | m->samples[idx_new].delay = delay; | |
bcdbbd7e | 468 | |
bcdbbd7e | 469 | /* calculate new jitter value from the RMS differences relative to the lowest delay sample */ |
687ed123 KS |
470 | jitter = m->samples_jitter; |
471 | for (idx_min = idx_cur, i = 0; i < ELEMENTSOF(m->samples); i++) | |
472 | if (m->samples[i].delay > 0 && m->samples[i].delay < m->samples[idx_min].delay) | |
bcdbbd7e KS |
473 | idx_min = i; |
474 | ||
3dbc7620 | 475 | j = 0; |
687ed123 KS |
476 | for (i = 0; i < ELEMENTSOF(m->samples); i++) |
477 | j += square(m->samples[i].offset - m->samples[idx_min].offset); | |
478 | m->samples_jitter = sqrt(j / (ELEMENTSOF(m->samples) - 1)); | |
bcdbbd7e | 479 | |
a47b9e62 | 480 | /* ignore samples when resyncing */ |
687ed123 | 481 | if (m->poll_resync) |
a47b9e62 KS |
482 | return false; |
483 | ||
484 | /* always accept offset if we are farther off than the round-trip delay */ | |
485 | if (fabs(offset) > delay) | |
486 | return false; | |
487 | ||
488 | /* we need a few samples before looking at them */ | |
687ed123 | 489 | if (m->packet_count < 4) |
a47b9e62 KS |
490 | return false; |
491 | ||
3dbc7620 | 492 | /* do not accept anything worse than the maximum possible error of the best sample */ |
687ed123 | 493 | if (fabs(offset) > m->samples[idx_min].delay) |
3dbc7620 KS |
494 | return true; |
495 | ||
496 | /* compare the difference between the current offset to the previous offset and jitter */ | |
687ed123 | 497 | return fabs(offset - m->samples[idx_cur].offset) > 3 * jitter; |
bcdbbd7e KS |
498 | } |
499 | ||
856a5a7d LP |
500 | static void manager_adjust_poll(Manager *m, double offset, bool spike) { |
501 | assert(m); | |
502 | ||
687ed123 KS |
503 | if (m->poll_resync) { |
504 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; | |
505 | m->poll_resync = false; | |
7b415867 KS |
506 | return; |
507 | } | |
508 | ||
bcdbbd7e | 509 | /* set to minimal poll interval */ |
18bb8adb | 510 | if (!spike && fabs(offset) > NTP_ACCURACY_SEC) { |
687ed123 | 511 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; |
bcdbbd7e KS |
512 | return; |
513 | } | |
514 | ||
515 | /* increase polling interval */ | |
3dbc7620 | 516 | if (fabs(offset) < NTP_ACCURACY_SEC * 0.25) { |
687ed123 KS |
517 | if (m->poll_interval_usec < NTP_POLL_INTERVAL_MAX_SEC * USEC_PER_SEC) |
518 | m->poll_interval_usec *= 2; | |
bcdbbd7e KS |
519 | return; |
520 | } | |
521 | ||
522 | /* decrease polling interval */ | |
3dbc7620 | 523 | if (spike || fabs(offset) > NTP_ACCURACY_SEC * 0.75) { |
687ed123 KS |
524 | if (m->poll_interval_usec > NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC) |
525 | m->poll_interval_usec /= 2; | |
bcdbbd7e KS |
526 | return; |
527 | } | |
528 | } | |
529 | ||
856a5a7d LP |
530 | static bool sockaddr_equal(union sockaddr_union *a, union sockaddr_union *b) { |
531 | assert(a); | |
532 | assert(b); | |
533 | ||
534 | if (a->sa.sa_family != b->sa.sa_family) | |
535 | return false; | |
536 | ||
537 | if (a->sa.sa_family == AF_INET) | |
538 | return a->in.sin_addr.s_addr == b->in.sin_addr.s_addr; | |
539 | ||
540 | if (a->sa.sa_family == AF_INET6) | |
541 | return memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)) == 0; | |
542 | ||
543 | return false; | |
544 | } | |
545 | ||
546 | static int manager_receive_response(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
687ed123 | 547 | Manager *m = userdata; |
856a5a7d LP |
548 | struct ntp_msg ntpmsg; |
549 | ||
bcdbbd7e | 550 | struct iovec iov = { |
856a5a7d LP |
551 | .iov_base = &ntpmsg, |
552 | .iov_len = sizeof(ntpmsg), | |
bcdbbd7e KS |
553 | }; |
554 | union { | |
555 | struct cmsghdr cmsghdr; | |
556 | uint8_t buf[CMSG_SPACE(sizeof(struct timeval))]; | |
557 | } control; | |
5f8cfaee | 558 | union sockaddr_union server_addr; |
bcdbbd7e KS |
559 | struct msghdr msghdr = { |
560 | .msg_iov = &iov, | |
561 | .msg_iovlen = 1, | |
562 | .msg_control = &control, | |
563 | .msg_controllen = sizeof(control), | |
564 | .msg_name = &server_addr, | |
565 | .msg_namelen = sizeof(server_addr), | |
566 | }; | |
567 | struct cmsghdr *cmsg; | |
3dbc7620 | 568 | struct timespec now_ts; |
bcdbbd7e KS |
569 | struct timeval *recv_time; |
570 | ssize_t len; | |
d2d66d1c | 571 | double origin, receive, trans, dest; |
bcdbbd7e KS |
572 | double delay, offset; |
573 | bool spike; | |
574 | int leap_sec; | |
575 | int r; | |
576 | ||
678522cf LP |
577 | assert(source); |
578 | assert(m); | |
579 | ||
bcdbbd7e | 580 | if (revents & (EPOLLHUP|EPOLLERR)) { |
678522cf LP |
581 | log_warning("Server connection returned error."); |
582 | return manager_connect(m); | |
bcdbbd7e KS |
583 | } |
584 | ||
585 | len = recvmsg(fd, &msghdr, MSG_DONTWAIT); | |
586 | if (len < 0) { | |
856a5a7d LP |
587 | if (errno == EAGAIN) |
588 | return 0; | |
589 | ||
678522cf LP |
590 | log_warning("Error receiving message. Disconnecting."); |
591 | return manager_connect(m); | |
bcdbbd7e KS |
592 | } |
593 | ||
594 | if (iov.iov_len < sizeof(struct ntp_msg)) { | |
678522cf LP |
595 | log_warning("Invalid response from server. Disconnecting."); |
596 | return manager_connect(m); | |
bcdbbd7e KS |
597 | } |
598 | ||
678522cf LP |
599 | if (!m->current_server_name || |
600 | !m->current_server_address || | |
601 | !sockaddr_equal(&server_addr, &m->current_server_address->sockaddr)) { | |
602 | log_debug("Response from unknown server."); | |
603 | return 0; | |
bcdbbd7e KS |
604 | } |
605 | ||
606 | recv_time = NULL; | |
607 | for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) { | |
608 | if (cmsg->cmsg_level != SOL_SOCKET) | |
609 | continue; | |
610 | ||
611 | switch (cmsg->cmsg_type) { | |
612 | case SCM_TIMESTAMP: | |
613 | recv_time = (struct timeval *) CMSG_DATA(cmsg); | |
614 | break; | |
615 | } | |
616 | } | |
617 | if (!recv_time) { | |
678522cf | 618 | log_error("Invalid packet timestamp."); |
bcdbbd7e KS |
619 | return -EINVAL; |
620 | } | |
621 | ||
687ed123 | 622 | if (!m->pending) { |
07a062a7 | 623 | log_debug("Unexpected reply. Ignoring."); |
bcdbbd7e KS |
624 | return 0; |
625 | } | |
bcdbbd7e KS |
626 | |
627 | /* check our "time cookie" (we just stored nanoseconds in the fraction field) */ | |
856a5a7d LP |
628 | if (be32toh(ntpmsg.origin_time.sec) != m->trans_time.tv_sec + OFFSET_1900_1970 || |
629 | be32toh(ntpmsg.origin_time.frac) != m->trans_time.tv_nsec) { | |
07a062a7 | 630 | log_debug("Invalid reply; not our transmit time. Ignoring."); |
bcdbbd7e KS |
631 | return 0; |
632 | } | |
633 | ||
16c058ba LP |
634 | m->event_timeout = sd_event_source_unref(m->event_timeout); |
635 | ||
661278ee LP |
636 | if (be32toh(ntpmsg.recv_time.sec) < TIME_EPOCH + OFFSET_1900_1970 || |
637 | be32toh(ntpmsg.trans_time.sec) < TIME_EPOCH + OFFSET_1900_1970) { | |
638 | log_debug("Invalid reply, returned times before epoch. Ignoring."); | |
639 | return manager_connect(m); | |
640 | } | |
641 | ||
856a5a7d | 642 | if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC) { |
07a062a7 | 643 | log_debug("Server is not synchronized. Disconnecting."); |
678522cf | 644 | return manager_connect(m); |
bcdbbd7e KS |
645 | } |
646 | ||
661278ee | 647 | if (!IN_SET(NTP_FIELD_VERSION(ntpmsg.field), 3, 4)) { |
856a5a7d | 648 | log_debug("Response NTPv%d. Disconnecting.", NTP_FIELD_VERSION(ntpmsg.field)); |
678522cf | 649 | return manager_connect(m); |
bcdbbd7e KS |
650 | } |
651 | ||
856a5a7d LP |
652 | if (NTP_FIELD_MODE(ntpmsg.field) != NTP_MODE_SERVER) { |
653 | log_debug("Unsupported mode %d. Disconnecting.", NTP_FIELD_MODE(ntpmsg.field)); | |
678522cf | 654 | return manager_connect(m); |
bcdbbd7e KS |
655 | } |
656 | ||
7b415867 | 657 | /* valid packet */ |
687ed123 KS |
658 | m->pending = false; |
659 | m->retry_interval = 0; | |
7b415867 | 660 | |
bcdbbd7e | 661 | /* announce leap seconds */ |
856a5a7d | 662 | if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_PLUSSEC) |
bcdbbd7e | 663 | leap_sec = 1; |
856a5a7d | 664 | else if (NTP_FIELD_LEAP(ntpmsg.field) & NTP_LEAP_MINUSSEC) |
bcdbbd7e KS |
665 | leap_sec = -1; |
666 | else | |
667 | leap_sec = 0; | |
668 | ||
669 | /* | |
670 | * "Timestamp Name ID When Generated | |
671 | * ------------------------------------------------------------ | |
672 | * Originate Timestamp T1 time request sent by client | |
673 | * Receive Timestamp T2 time request received by server | |
674 | * Transmit Timestamp T3 time reply sent by server | |
675 | * Destination Timestamp T4 time reply received by client | |
676 | * | |
07a062a7 | 677 | * The round-trip delay, d, and system clock offset, t, are defined as: |
bcdbbd7e KS |
678 | * d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2" |
679 | */ | |
856a5a7d | 680 | assert_se(clock_gettime(CLOCK_MONOTONIC, &now_ts) >= 0); |
687ed123 | 681 | origin = tv_to_d(recv_time) - (ts_to_d(&now_ts) - ts_to_d(&m->trans_time_mon)) + OFFSET_1900_1970; |
856a5a7d LP |
682 | receive = ntp_ts_to_d(&ntpmsg.recv_time); |
683 | trans = ntp_ts_to_d(&ntpmsg.trans_time); | |
bcdbbd7e KS |
684 | dest = tv_to_d(recv_time) + OFFSET_1900_1970; |
685 | ||
d2d66d1c KS |
686 | offset = ((receive - origin) + (trans - dest)) / 2; |
687 | delay = (dest - origin) - (trans - receive); | |
bcdbbd7e | 688 | |
856a5a7d | 689 | spike = manager_sample_spike_detection(m, offset, delay); |
bcdbbd7e | 690 | |
856a5a7d | 691 | manager_adjust_poll(m, offset, spike); |
bcdbbd7e KS |
692 | |
693 | log_debug("NTP response:\n" | |
694 | " leap : %u\n" | |
695 | " version : %u\n" | |
696 | " mode : %u\n" | |
697 | " stratum : %u\n" | |
d67006fe | 698 | " precision : %.6f sec (%d)\n" |
bcdbbd7e | 699 | " reference : %.4s\n" |
ba9f11dc KS |
700 | " origin : %.3f\n" |
701 | " receive : %.3f\n" | |
702 | " transmit : %.3f\n" | |
703 | " dest : %.3f\n" | |
704 | " offset : %+.3f sec\n" | |
705 | " delay : %+.3f sec\n" | |
8fe90522 | 706 | " packet count : %"PRIu64"\n" |
ba9f11dc | 707 | " jitter : %.3f%s\n" |
609e002e | 708 | " poll interval: " USEC_FMT "\n", |
856a5a7d LP |
709 | NTP_FIELD_LEAP(ntpmsg.field), |
710 | NTP_FIELD_VERSION(ntpmsg.field), | |
711 | NTP_FIELD_MODE(ntpmsg.field), | |
712 | ntpmsg.stratum, | |
713 | exp2(ntpmsg.precision), ntpmsg.precision, | |
714 | ntpmsg.stratum == 1 ? ntpmsg.refid : "n/a", | |
bcdbbd7e | 715 | origin - OFFSET_1900_1970, |
d2d66d1c | 716 | receive - OFFSET_1900_1970, |
bcdbbd7e KS |
717 | trans - OFFSET_1900_1970, |
718 | dest - OFFSET_1900_1970, | |
719 | offset, delay, | |
687ed123 KS |
720 | m->packet_count, |
721 | m->samples_jitter, spike ? " spike" : "", | |
722 | m->poll_interval_usec / USEC_PER_SEC); | |
bcdbbd7e | 723 | |
bcdbbd7e | 724 | if (!spike) { |
d636d376 | 725 | m->sync = true; |
856a5a7d | 726 | r = manager_adjust_clock(m, offset, leap_sec); |
bcdbbd7e KS |
727 | if (r < 0) |
728 | log_error("Failed to call clock_adjtime(): %m"); | |
729 | } | |
730 | ||
609e002e | 731 | log_info("interval/delta/delay/jitter/drift " USEC_FMT "s/%+.3fs/%.3fs/%.3fs/%+ippm%s", |
08937720 | 732 | m->poll_interval_usec / USEC_PER_SEC, offset, delay, m->samples_jitter, m->drift_ppm, |
ef619194 | 733 | spike ? " (ignored)" : ""); |
bcdbbd7e | 734 | |
678522cf LP |
735 | r = manager_arm_timer(m, m->poll_interval_usec); |
736 | if (r < 0) { | |
737 | log_error("Failed to rearm timer: %s", strerror(-r)); | |
738 | return r; | |
739 | } | |
740 | ||
741 | return 0; | |
bcdbbd7e KS |
742 | } |
743 | ||
856a5a7d LP |
744 | static int manager_listen_setup(Manager *m) { |
745 | union sockaddr_union addr = {}; | |
746 | static const int tos = IPTOS_LOWDELAY; | |
747 | static const int on = 1; | |
748 | int r; | |
bcdbbd7e | 749 | |
687ed123 | 750 | assert(m); |
bcdbbd7e | 751 | |
856a5a7d LP |
752 | assert(m->server_socket < 0); |
753 | assert(!m->event_receive); | |
678522cf | 754 | assert(m->current_server_address); |
bcdbbd7e | 755 | |
678522cf | 756 | addr.sa.sa_family = m->current_server_address->sockaddr.sa.sa_family; |
bcdbbd7e | 757 | |
856a5a7d LP |
758 | m->server_socket = socket(addr.sa.sa_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); |
759 | if (m->server_socket < 0) | |
760 | return -errno; | |
bcdbbd7e | 761 | |
678522cf | 762 | r = bind(m->server_socket, &addr.sa, m->current_server_address->socklen); |
856a5a7d LP |
763 | if (r < 0) |
764 | return -errno; | |
765 | ||
766 | r = setsockopt(m->server_socket, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)); | |
767 | if (r < 0) | |
768 | return -errno; | |
769 | ||
770 | setsockopt(m->server_socket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); | |
bcdbbd7e | 771 | |
856a5a7d | 772 | return sd_event_add_io(m->event, &m->event_receive, m->server_socket, EPOLLIN, manager_receive_response, m); |
bcdbbd7e KS |
773 | } |
774 | ||
678522cf | 775 | static int manager_begin(Manager *m) { |
856a5a7d | 776 | _cleanup_free_ char *pretty = NULL; |
856a5a7d | 777 | int r; |
bcdbbd7e | 778 | |
856a5a7d | 779 | assert(m); |
678522cf LP |
780 | assert_return(m->current_server_name, -EHOSTUNREACH); |
781 | assert_return(m->current_server_address, -EHOSTUNREACH); | |
7b415867 | 782 | |
678522cf | 783 | m->poll_interval_usec = NTP_POLL_INTERVAL_MIN_SEC * USEC_PER_SEC; |
856a5a7d | 784 | |
ae2db4e7 | 785 | server_address_pretty(m->current_server_address, &pretty); |
16c058ba LP |
786 | log_info("Using NTP server %s (%s).", strna(pretty), m->current_server_name->string); |
787 | sd_notifyf(false, "STATUS=Using Time Server %s (%s).", strna(pretty), m->current_server_name->string); | |
856a5a7d LP |
788 | |
789 | r = manager_listen_setup(m); | |
790 | if (r < 0) { | |
791 | log_warning("Failed to setup connection socket: %s", strerror(-r)); | |
792 | return r; | |
793 | } | |
794 | ||
795 | r = manager_clock_watch_setup(m); | |
678522cf | 796 | if (r < 0) |
856a5a7d | 797 | return r; |
856a5a7d LP |
798 | |
799 | return manager_send_request(m); | |
bcdbbd7e KS |
800 | } |
801 | ||
678522cf LP |
802 | static void server_name_flush_addresses(ServerName *n) { |
803 | ServerAddress *a; | |
804 | ||
805 | assert(n); | |
806 | ||
807 | while ((a = n->addresses)) { | |
808 | LIST_REMOVE(addresses, n->addresses, a); | |
809 | free(a); | |
810 | } | |
811 | } | |
812 | ||
813 | static void manager_flush_names(Manager *m) { | |
814 | ServerName *n; | |
815 | ||
816 | assert(m); | |
817 | ||
818 | while ((n = m->servers)) { | |
819 | LIST_REMOVE(names, m->servers, n); | |
820 | free(n->string); | |
821 | server_name_flush_addresses(n); | |
822 | free(n); | |
823 | } | |
824 | } | |
825 | ||
826 | static int manager_resolve_handler(sd_resolve_query *q, int ret, const struct addrinfo *ai, void *userdata) { | |
827 | Manager *m = userdata; | |
828 | ServerAddress *a, *last = NULL; | |
829 | ||
830 | assert(q); | |
831 | assert(m); | |
832 | assert(m->current_server_name); | |
833 | ||
834 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); | |
835 | ||
836 | if (ret != 0) { | |
4d40d39c | 837 | log_debug("Failed to resolve %s: %s", m->current_server_name->string, gai_strerror(ret)); |
678522cf LP |
838 | |
839 | /* Try next host */ | |
840 | return manager_connect(m); | |
841 | } | |
842 | ||
843 | server_name_flush_addresses(m->current_server_name); | |
844 | ||
845 | for (; ai; ai = ai->ai_next) { | |
846 | _cleanup_free_ char *pretty = NULL; | |
847 | ||
848 | assert(ai->ai_addr); | |
849 | assert(ai->ai_addrlen >= offsetof(struct sockaddr, sa_data)); | |
850 | assert(ai->ai_addrlen <= sizeof(union sockaddr_union)); | |
851 | ||
852 | if (!IN_SET(ai->ai_addr->sa_family, AF_INET, AF_INET6)) { | |
853 | log_warning("Unsuitable address protocol for %s", m->current_server_name->string); | |
854 | continue; | |
855 | } | |
856 | ||
857 | a = new0(ServerAddress, 1); | |
858 | if (!a) | |
859 | return log_oom(); | |
860 | ||
861 | memcpy(&a->sockaddr, ai->ai_addr, ai->ai_addrlen); | |
862 | a->socklen = ai->ai_addrlen; | |
863 | ||
864 | LIST_INSERT_AFTER(addresses, m->current_server_name->addresses, last, a); | |
865 | last = a; | |
866 | ||
867 | sockaddr_pretty(&a->sockaddr.sa, a->socklen, true, &pretty); | |
16c058ba | 868 | log_debug("Resolved address %s for %s.", pretty, m->current_server_name->string); |
678522cf LP |
869 | } |
870 | ||
871 | if (!m->current_server_name->addresses) { | |
872 | log_error("Failed to find suitable address for host %s.", m->current_server_name->string); | |
873 | ||
874 | /* Try next host */ | |
875 | return manager_connect(m); | |
876 | } | |
877 | ||
878 | m->current_server_address = m->current_server_name->addresses; | |
879 | ||
880 | return manager_begin(m); | |
881 | } | |
882 | ||
7a183c4c LP |
883 | static int manager_retry(sd_event_source *source, usec_t usec, void *userdata) { |
884 | Manager *m = userdata; | |
885 | ||
886 | assert(m); | |
887 | ||
888 | return manager_connect(m); | |
889 | } | |
890 | ||
678522cf | 891 | static int manager_connect(Manager *m) { |
5f8cfaee | 892 | |
856a5a7d LP |
893 | struct addrinfo hints = { |
894 | .ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG, | |
895 | .ai_socktype = SOCK_DGRAM, | |
5f8cfaee | 896 | }; |
678522cf | 897 | int r; |
5f8cfaee | 898 | |
856a5a7d | 899 | assert(m); |
bcdbbd7e | 900 | |
678522cf LP |
901 | manager_disconnect(m); |
902 | ||
7a183c4c LP |
903 | m->event_retry = sd_event_source_unref(m->event_retry); |
904 | if (!ratelimit_test(&m->ratelimit)) { | |
905 | log_debug("Slowing down attempts to contact servers."); | |
906 | ||
907 | r = sd_event_add_time(m->event, &m->event_retry, CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + RETRY_USEC, 0, manager_retry, m); | |
908 | if (r < 0) { | |
909 | log_error("Failed to create retry timer: %s", strerror(-r)); | |
910 | return r; | |
911 | } | |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
678522cf LP |
916 | /* If we already are operating on some address, switch to the |
917 | * next one. */ | |
918 | if (m->current_server_address && m->current_server_address->addresses_next) | |
919 | m->current_server_address = m->current_server_address->addresses_next; | |
920 | else { | |
921 | /* Hmm, we are through all addresses, let's look for the next host instead */ | |
922 | m->current_server_address = NULL; | |
923 | ||
924 | if (m->current_server_name && m->current_server_name->names_next) | |
925 | m->current_server_name = m->current_server_name->names_next; | |
926 | else { | |
927 | if (!m->servers) { | |
928 | m->current_server_name = NULL; | |
929 | log_debug("No server found."); | |
930 | return 0; | |
931 | } | |
932 | ||
933 | m->current_server_name = m->servers; | |
934 | } | |
935 | ||
05f7fc0f LP |
936 | /* Tell the resolver to reread /etc/resolv.conf, in |
937 | * case it changed. */ | |
938 | res_init(); | |
939 | ||
678522cf LP |
940 | r = sd_resolve_getaddrinfo(m->resolve, &m->resolve_query, m->current_server_name->string, "123", &hints, manager_resolve_handler, m); |
941 | if (r < 0) { | |
942 | log_error("Failed to create resolver: %s", strerror(-r)); | |
943 | return r; | |
944 | } | |
945 | ||
946 | return 1; | |
947 | } | |
948 | ||
949 | r = manager_begin(m); | |
950 | if (r < 0) | |
951 | return r; | |
952 | ||
953 | return 1; | |
954 | } | |
955 | ||
956 | static int manager_add_server(Manager *m, const char *server) { | |
60080921 | 957 | ServerName *n, *tail; |
678522cf LP |
958 | |
959 | assert(m); | |
960 | assert(server); | |
bcdbbd7e | 961 | |
678522cf LP |
962 | n = new0(ServerName, 1); |
963 | if (!n) | |
856a5a7d | 964 | return -ENOMEM; |
bcdbbd7e | 965 | |
678522cf LP |
966 | n->string = strdup(server); |
967 | if (!n->string) { | |
968 | free(n); | |
969 | return -ENOMEM; | |
970 | } | |
bcdbbd7e | 971 | |
376cd3b8 LP |
972 | LIST_FIND_TAIL(names, m->servers, tail); |
973 | LIST_INSERT_AFTER(names, m->servers, tail, n); | |
60080921 | 974 | |
678522cf | 975 | return 0; |
856a5a7d | 976 | } |
bcdbbd7e | 977 | |
e8af6973 LP |
978 | static int manager_add_server_string(Manager *m, const char *string) { |
979 | char *w, *state; | |
980 | size_t l; | |
981 | int r; | |
982 | ||
983 | assert(m); | |
984 | assert(string); | |
985 | ||
986 | FOREACH_WORD_QUOTED(w, l, string, state) { | |
987 | char t[l+1]; | |
988 | ||
989 | memcpy(t, w, l); | |
990 | t[l] = 0; | |
991 | ||
992 | r = manager_add_server(m, t); | |
993 | if (r < 0) | |
994 | log_error("Failed to add server %s to configuration, ignoring: %s", t, strerror(-r)); | |
995 | } | |
996 | ||
997 | return 0; | |
998 | } | |
999 | ||
856a5a7d LP |
1000 | static void manager_disconnect(Manager *m) { |
1001 | assert(m); | |
bcdbbd7e | 1002 | |
856a5a7d | 1003 | m->resolve_query = sd_resolve_query_unref(m->resolve_query); |
bcdbbd7e | 1004 | |
856a5a7d LP |
1005 | m->event_timer = sd_event_source_unref(m->event_timer); |
1006 | ||
1007 | m->event_receive = sd_event_source_unref(m->event_receive); | |
1008 | m->server_socket = safe_close(m->server_socket); | |
1009 | ||
856a5a7d LP |
1010 | m->event_clock_watch = sd_event_source_unref(m->event_clock_watch); |
1011 | m->clock_watch_fd = safe_close(m->clock_watch_fd); | |
16c058ba LP |
1012 | |
1013 | m->event_timeout = sd_event_source_unref(m->event_timeout); | |
1014 | ||
1015 | sd_notifyf(false, "STATUS=Idle."); | |
7b415867 KS |
1016 | } |
1017 | ||
687ed123 KS |
1018 | static int manager_new(Manager **ret) { |
1019 | _cleanup_manager_free_ Manager *m = NULL; | |
7b415867 KS |
1020 | int r; |
1021 | ||
c92e531c LP |
1022 | assert(ret); |
1023 | ||
687ed123 KS |
1024 | m = new0(Manager, 1); |
1025 | if (!m) | |
7b415867 KS |
1026 | return -ENOMEM; |
1027 | ||
856a5a7d LP |
1028 | m->server_socket = m->clock_watch_fd = -1; |
1029 | ||
7a183c4c LP |
1030 | RATELIMIT_INIT(m->ratelimit, RATELIMIT_INTERVAL_USEC, RATELIMIT_BURST); |
1031 | ||
687ed123 | 1032 | r = sd_event_default(&m->event); |
7b415867 KS |
1033 | if (r < 0) |
1034 | return r; | |
1035 | ||
9f711549 LP |
1036 | sd_event_set_watchdog(m->event, true); |
1037 | ||
f864fd1b LP |
1038 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); |
1039 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
856a5a7d LP |
1040 | |
1041 | r = sd_resolve_default(&m->resolve); | |
7b415867 KS |
1042 | if (r < 0) |
1043 | return r; | |
1044 | ||
856a5a7d LP |
1045 | r = sd_resolve_attach_event(m->resolve, m->event, 0); |
1046 | if (r < 0) | |
59a9fce4 | 1047 | return r; |
856a5a7d | 1048 | |
687ed123 KS |
1049 | *ret = m; |
1050 | m = NULL; | |
bcdbbd7e KS |
1051 | |
1052 | return 0; | |
1053 | } | |
1054 | ||
687ed123 | 1055 | static void manager_free(Manager *m) { |
687ed123 KS |
1056 | if (!m) |
1057 | return; | |
1058 | ||
856a5a7d | 1059 | manager_disconnect(m); |
678522cf | 1060 | manager_flush_names(m); |
856a5a7d | 1061 | |
7a183c4c LP |
1062 | sd_event_source_unref(m->event_retry); |
1063 | ||
e0e5ce23 TG |
1064 | sd_event_source_unref(m->network_event_source); |
1065 | sd_network_monitor_unref(m->network_monitor); | |
1066 | ||
856a5a7d | 1067 | sd_resolve_unref(m->resolve); |
687ed123 | 1068 | sd_event_unref(m->event); |
856a5a7d | 1069 | |
687ed123 KS |
1070 | free(m); |
1071 | } | |
1072 | ||
e8af6973 LP |
1073 | int config_parse_servers( |
1074 | const char *unit, | |
1075 | const char *filename, | |
1076 | unsigned line, | |
1077 | const char *section, | |
1078 | unsigned section_line, | |
1079 | const char *lvalue, | |
1080 | int ltype, | |
1081 | const char *rvalue, | |
1082 | void *data, | |
1083 | void *userdata) { | |
1084 | ||
1085 | Manager *m = userdata; | |
1086 | ||
1087 | assert(filename); | |
1088 | assert(lvalue); | |
1089 | assert(rvalue); | |
1090 | ||
1091 | manager_flush_names(m); | |
1092 | manager_add_server_string(m, rvalue); | |
1093 | ||
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | static int manager_parse_config_file(Manager *m) { | |
36f822c4 ZJS |
1098 | return config_parse(NULL, "/etc/systemd/timesyncd.conf", NULL, |
1099 | "Time\0", | |
1100 | config_item_perf_lookup, timesyncd_gperf_lookup, | |
1101 | false, false, true, m); | |
e8af6973 LP |
1102 | } |
1103 | ||
e0e5ce23 | 1104 | static bool network_is_online(void) { |
9b3310b0 TG |
1105 | _cleanup_free_ char *state = NULL; |
1106 | int r; | |
e0e5ce23 | 1107 | |
9b3310b0 | 1108 | r = sd_network_get_operational_state(&state); |
a6cb8f87 | 1109 | if (r >= 0 && STR_IN_SET(state, "routable", "degraded")) |
9b3310b0 | 1110 | return true; |
a6cb8f87 KS |
1111 | |
1112 | return false; | |
e0e5ce23 TG |
1113 | } |
1114 | ||
1115 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, | |
1116 | void *userdata) { | |
1117 | Manager *m = userdata; | |
1118 | bool connected, online; | |
1119 | int r; | |
1120 | ||
1121 | assert(m); | |
1122 | ||
1123 | /* check if the machine is online */ | |
1124 | online = network_is_online(); | |
1125 | ||
1126 | /* check if the client is currently connected */ | |
1127 | connected = (m->server_socket != -1); | |
1128 | ||
1129 | if (connected && !online) { | |
4d40d39c | 1130 | log_info("No network connectivity, watching for changes."); |
e0e5ce23 TG |
1131 | manager_disconnect(m); |
1132 | } else if (!connected && online) { | |
4d40d39c | 1133 | log_info("Network configuration changed, trying to establish connection."); |
e0e5ce23 TG |
1134 | if (m->current_server_address) { |
1135 | r = manager_begin(m); | |
1136 | if (r < 0) | |
1137 | return r; | |
1138 | } else { | |
1139 | r = manager_connect(m); | |
1140 | if (r < 0) | |
1141 | return r; | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | sd_network_monitor_flush(m->network_monitor); | |
1146 | ||
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | static int manager_network_monitor_listen(Manager *m) { | |
1151 | _cleanup_event_source_unref_ sd_event_source *event_source = NULL; | |
1152 | _cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL; | |
1153 | int r, fd, events; | |
1154 | ||
0014a4ad | 1155 | r = sd_network_monitor_new(&monitor, NULL); |
e0e5ce23 TG |
1156 | if (r < 0) |
1157 | return r; | |
1158 | ||
1159 | fd = sd_network_monitor_get_fd(monitor); | |
1160 | if (fd < 0) | |
1161 | return fd; | |
1162 | ||
1163 | events = sd_network_monitor_get_events(monitor); | |
1164 | if (events < 0) | |
1165 | return events; | |
1166 | ||
1167 | r = sd_event_add_io(m->event, &event_source, fd, events, | |
1168 | &manager_network_event_handler, m); | |
1169 | if (r < 0) | |
1170 | return r; | |
1171 | ||
1172 | m->network_monitor = monitor; | |
1173 | m->network_event_source = event_source; | |
1174 | monitor = NULL; | |
1175 | event_source = NULL; | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
687ed123 | 1180 | int main(int argc, char *argv[]) { |
ece6e766 | 1181 | const char *user = "systemd-timesync"; |
687ed123 | 1182 | _cleanup_manager_free_ Manager *m = NULL; |
ece6e766 LP |
1183 | uid_t uid; |
1184 | gid_t gid; | |
687ed123 KS |
1185 | int r; |
1186 | ||
e8af6973 LP |
1187 | if (argc > 1) { |
1188 | log_error("This program does not take arguments."); | |
1189 | return EXIT_FAILURE; | |
1190 | } | |
1191 | ||
687ed123 | 1192 | log_set_target(LOG_TARGET_AUTO); |
e8af6973 | 1193 | log_set_facility(LOG_CRON); |
687ed123 KS |
1194 | log_parse_environment(); |
1195 | log_open(); | |
1196 | ||
e8af6973 LP |
1197 | umask(0022); |
1198 | ||
ece6e766 LP |
1199 | r = get_user_creds(&user, &uid, &gid, NULL, NULL); |
1200 | if (r < 0) { | |
1201 | log_error("Cannot resolve user name %s: %s", user, strerror(-r)); | |
1202 | return r; | |
1203 | } | |
1204 | ||
d636d376 | 1205 | r = load_clock_timestamp(uid, gid); |
ece6e766 LP |
1206 | if (r < 0) |
1207 | goto out; | |
1208 | ||
966bff26 | 1209 | r = drop_privileges(uid, gid, (1ULL << CAP_SYS_TIME)); |
a349eb10 LP |
1210 | if (r < 0) |
1211 | goto out; | |
1212 | ||
856a5a7d LP |
1213 | assert_se(sigprocmask_many(SIG_BLOCK, SIGTERM, SIGINT, -1) == 0); |
1214 | ||
687ed123 | 1215 | r = manager_new(&m); |
856a5a7d LP |
1216 | if (r < 0) { |
1217 | log_error("Failed to allocate manager: %s", strerror(-r)); | |
687ed123 | 1218 | goto out; |
856a5a7d | 1219 | } |
687ed123 | 1220 | |
e8af6973 LP |
1221 | manager_add_server_string(m, NTP_SERVERS); |
1222 | manager_parse_config_file(m); | |
687ed123 | 1223 | |
e0e5ce23 TG |
1224 | r = manager_network_monitor_listen(m); |
1225 | if (r < 0) { | |
1226 | log_error("Failed to listen to networkd events: %s", strerror(-r)); | |
1227 | goto out; | |
1228 | } | |
1229 | ||
e8af6973 LP |
1230 | log_debug("systemd-timesyncd running as pid %lu", (unsigned long) getpid()); |
1231 | sd_notify(false, "READY=1"); | |
39594d49 | 1232 | |
e0e5ce23 TG |
1233 | if (network_is_online()) { |
1234 | r = manager_connect(m); | |
1235 | if (r < 0) | |
1236 | goto out; | |
1237 | } | |
678522cf | 1238 | |
687ed123 | 1239 | r = sd_event_loop(m->event); |
856a5a7d LP |
1240 | if (r < 0) { |
1241 | log_error("Failed to run event loop: %s", strerror(-r)); | |
687ed123 | 1242 | goto out; |
856a5a7d LP |
1243 | } |
1244 | ||
1245 | sd_event_get_exit_code(m->event, &r); | |
d636d376 KS |
1246 | |
1247 | /* if we got an authoritative time, store it in the file system */ | |
1248 | if (m->sync) | |
1249 | touch("/var/lib/systemd/clock"); | |
687ed123 KS |
1250 | |
1251 | out: | |
e8af6973 LP |
1252 | sd_notify(false, "STATUS=Shutting down..."); |
1253 | ||
687ed123 | 1254 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
bcdbbd7e | 1255 | } |