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88840341 | 1 | /* |
88840341 RC |
2 | chronyd/chronyc - Programs for keeping computer clocks accurate. |
3 | ||
4 | ********************************************************************** | |
6672f045 | 5 | * Copyright (C) Richard P. Curnow 1997-2003 |
f7e08d0c | 6 | * Copyright (C) John G. Hasler 2009 |
0c738d84 | 7 | * Copyright (C) Miroslav Lichvar 2012 |
88840341 RC |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of version 2 of the GNU General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program 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 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
8e23110a | 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
88840341 RC |
21 | * |
22 | ********************************************************************** | |
23 | ||
24 | ======================================================================= | |
25 | ||
26 | The main program | |
27 | */ | |
28 | ||
da2c8d90 ML |
29 | #include "config.h" |
30 | ||
88840341 RC |
31 | #include "sysincl.h" |
32 | ||
33 | #include "main.h" | |
34 | #include "sched.h" | |
35 | #include "local.h" | |
36 | #include "sys.h" | |
37 | #include "ntp_io.h" | |
38 | #include "ntp_sources.h" | |
39 | #include "ntp_core.h" | |
40 | #include "sources.h" | |
41 | #include "sourcestats.h" | |
42 | #include "reference.h" | |
43 | #include "logging.h" | |
44 | #include "conf.h" | |
45 | #include "cmdmon.h" | |
46 | #include "keys.h" | |
88840341 | 47 | #include "manual.h" |
88840341 | 48 | #include "rtc.h" |
ac30bb06 | 49 | #include "refclock.h" |
88840341 RC |
50 | #include "clientlog.h" |
51 | #include "broadcast.h" | |
fbd20c42 | 52 | #include "nameserv.h" |
c386d117 | 53 | #include "tempcomp.h" |
88840341 RC |
54 | |
55 | /* ================================================== */ | |
56 | ||
57 | /* Set when the initialisation chain has been completed. Prevents finalisation | |
58 | * chain being run if a fatal error happened early. */ | |
59 | ||
60 | static int initialised = 0; | |
61 | ||
93b66ac1 | 62 | static int exit_status = 0; |
88840341 RC |
63 | |
64 | static int reload = 0; | |
65 | ||
7fda9c67 ML |
66 | static REF_Mode ref_mode; |
67 | ||
88840341 RC |
68 | /* ================================================== */ |
69 | ||
70 | static void | |
71 | delete_pidfile(void) | |
72 | { | |
73 | const char *pidfile = CNF_GetPidFile(); | |
74 | /* Don't care if this fails, there's not a lot we can do */ | |
75 | unlink(pidfile); | |
76 | } | |
77 | ||
78 | /* ================================================== */ | |
79 | ||
1e7e7d32 | 80 | void |
88840341 RC |
81 | MAI_CleanupAndExit(void) |
82 | { | |
93b66ac1 | 83 | if (!initialised) exit(exit_status); |
88840341 RC |
84 | |
85 | if (CNF_GetDumpOnExit()) { | |
86 | SRC_DumpSources(); | |
87 | } | |
88 | ||
c386d117 | 89 | TMC_Finalise(); |
88840341 | 90 | MNL_Finalise(); |
88840341 | 91 | CLG_Finalise(); |
88840341 RC |
92 | NSR_Finalise(); |
93 | NCR_Finalise(); | |
94 | BRD_Finalise(); | |
88840341 RC |
95 | SST_Finalise(); |
96 | REF_Finalise(); | |
1c901b82 | 97 | KEY_Finalise(); |
ac30bb06 | 98 | RCL_Finalise(); |
3a222336 | 99 | SRC_Finalise(); |
be42b4ee ML |
100 | RTC_Finalise(); |
101 | CAM_Finalise(); | |
102 | NIO_Finalise(); | |
88840341 RC |
103 | SYS_Finalise(); |
104 | SCH_Finalise(); | |
105 | LCL_Finalise(); | |
106 | ||
107 | delete_pidfile(); | |
108 | ||
109 | LOG_Finalise(); | |
110 | ||
93b66ac1 | 111 | exit(exit_status); |
88840341 RC |
112 | } |
113 | ||
114 | /* ================================================== */ | |
115 | ||
116 | static void | |
117 | signal_cleanup(int x) | |
118 | { | |
9416a24f ML |
119 | if (!initialised) exit(0); |
120 | SCH_QuitProgram(); | |
88840341 RC |
121 | } |
122 | ||
123 | /* ================================================== */ | |
124 | ||
125 | static void | |
6ee357d2 | 126 | ntp_source_resolving_end(void) |
88840341 | 127 | { |
6ee357d2 | 128 | NSR_SetSourceResolvingEndHandler(NULL); |
88840341 | 129 | |
88840341 RC |
130 | if (reload) { |
131 | /* Note, we want reload to come well after the initialisation from | |
132 | the real time clock - this gives us a fighting chance that the | |
133 | system-clock scale for the reloaded samples still has a | |
134 | semblence of validity about it. */ | |
135 | SRC_ReloadSources(); | |
136 | } | |
88840341 RC |
137 | |
138 | RTC_StartMeasurements(); | |
ac30bb06 | 139 | RCL_StartRefclocks(); |
779e40ed ML |
140 | NSR_StartSources(); |
141 | NSR_AutoStartSources(); | |
70feea48 ML |
142 | |
143 | /* Special modes can end only when sources update their reachability. | |
7fa22d4c ML |
144 | Give up immediatelly if there are no active sources. */ |
145 | if (ref_mode != REF_ModeNormal && !SRC_ActiveSources()) { | |
70feea48 ML |
146 | REF_SetUnsynchronised(); |
147 | } | |
88840341 RC |
148 | } |
149 | ||
150 | /* ================================================== */ | |
151 | ||
6ee357d2 ML |
152 | static void |
153 | post_init_ntp_hook(void *anything) | |
154 | { | |
155 | if (ref_mode == REF_ModeInitStepSlew) { | |
156 | /* Remove the initstepslew sources and set normal mode */ | |
157 | NSR_RemoveAllSources(); | |
158 | ref_mode = REF_ModeNormal; | |
159 | REF_SetMode(ref_mode); | |
160 | } | |
161 | ||
162 | /* Close the pipe to the foreground process so it can exit */ | |
163 | LOG_CloseParentFd(); | |
164 | ||
165 | CNF_AddSources(); | |
166 | CNF_AddBroadcasts(); | |
167 | ||
168 | NSR_SetSourceResolvingEndHandler(ntp_source_resolving_end); | |
169 | NSR_ResolveSources(); | |
170 | } | |
171 | ||
172 | /* ================================================== */ | |
173 | ||
7fda9c67 ML |
174 | static void |
175 | reference_mode_end(int result) | |
176 | { | |
177 | switch (ref_mode) { | |
178 | case REF_ModeNormal: | |
70feea48 ML |
179 | case REF_ModeUpdateOnce: |
180 | case REF_ModePrintOnce: | |
93b66ac1 ML |
181 | exit_status = !result; |
182 | SCH_QuitProgram(); | |
7fda9c67 ML |
183 | break; |
184 | case REF_ModeInitStepSlew: | |
185 | /* post_init_ntp_hook removes sources and a source call is | |
186 | on the stack here, so it can't be called directly */ | |
187 | SCH_AddTimeoutByDelay(0.0, post_init_ntp_hook, NULL); | |
188 | break; | |
189 | default: | |
190 | assert(0); | |
191 | } | |
192 | } | |
193 | ||
194 | /* ================================================== */ | |
195 | ||
88840341 RC |
196 | static void |
197 | post_init_rtc_hook(void *anything) | |
198 | { | |
7fda9c67 ML |
199 | if (CNF_GetInitSources() > 0) { |
200 | CNF_AddInitSources(); | |
779e40ed | 201 | NSR_StartSources(); |
7fda9c67 ML |
202 | assert(REF_GetMode() != REF_ModeNormal); |
203 | /* Wait for mode end notification */ | |
204 | } else { | |
205 | (post_init_ntp_hook)(NULL); | |
206 | } | |
88840341 RC |
207 | } |
208 | ||
209 | /* ================================================== */ | |
210 | /* Return 1 if the process exists on the system. */ | |
211 | ||
212 | static int | |
213 | does_process_exist(int pid) | |
214 | { | |
215 | int status; | |
216 | status = getsid(pid); | |
217 | if (status >= 0) { | |
218 | return 1; | |
219 | } else { | |
220 | return 0; | |
221 | } | |
222 | } | |
223 | ||
224 | /* ================================================== */ | |
225 | ||
226 | static int | |
227 | maybe_another_chronyd_running(int *other_pid) | |
228 | { | |
229 | const char *pidfile = CNF_GetPidFile(); | |
230 | FILE *in; | |
231 | int pid, count; | |
232 | ||
233 | *other_pid = 0; | |
234 | ||
235 | in = fopen(pidfile, "r"); | |
236 | if (!in) return 0; | |
237 | ||
238 | count = fscanf(in, "%d", &pid); | |
239 | fclose(in); | |
240 | ||
241 | if (count != 1) return 0; | |
242 | ||
243 | *other_pid = pid; | |
244 | return does_process_exist(pid); | |
245 | ||
246 | } | |
247 | ||
248 | /* ================================================== */ | |
249 | ||
250 | static void | |
251 | write_lockfile(void) | |
252 | { | |
253 | const char *pidfile = CNF_GetPidFile(); | |
254 | FILE *out; | |
255 | ||
256 | out = fopen(pidfile, "w"); | |
257 | if (!out) { | |
fe35de69 | 258 | LOG_FATAL(LOGF_Main, "could not open lockfile %s for writing", pidfile); |
88840341 RC |
259 | } else { |
260 | fprintf(out, "%d\n", getpid()); | |
261 | fclose(out); | |
262 | } | |
263 | } | |
264 | ||
265 | /* ================================================== */ | |
266 | ||
fe4b661f ML |
267 | static void |
268 | go_daemon(void) | |
269 | { | |
270 | #ifdef WINNT | |
271 | ||
272 | ||
273 | #else | |
274 | ||
1d2a0856 ML |
275 | int pid, fd, pipefd[2]; |
276 | ||
277 | /* Create pipe which will the daemon use to notify the grandparent | |
278 | when it's initialised or send an error message */ | |
279 | if (pipe(pipefd)) { | |
fe35de69 | 280 | LOG_FATAL(LOGF_Logging, "Could not detach, pipe failed : %s", strerror(errno)); |
1d2a0856 | 281 | } |
fe4b661f ML |
282 | |
283 | /* Does this preserve existing signal handlers? */ | |
284 | pid = fork(); | |
285 | ||
286 | if (pid < 0) { | |
fe35de69 | 287 | LOG_FATAL(LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno)); |
fe4b661f | 288 | } else if (pid > 0) { |
1d2a0856 ML |
289 | /* In the 'grandparent' */ |
290 | char message[1024]; | |
291 | int r; | |
292 | ||
293 | close(pipefd[1]); | |
294 | r = read(pipefd[0], message, sizeof (message)); | |
295 | if (r) { | |
296 | if (r > 0) { | |
297 | /* Print the error message from the child */ | |
298 | fprintf(stderr, "%.1024s\n", message); | |
299 | } | |
300 | exit(1); | |
301 | } else | |
302 | exit(0); | |
fe4b661f | 303 | } else { |
1d2a0856 | 304 | close(pipefd[0]); |
fe4b661f ML |
305 | |
306 | setsid(); | |
307 | ||
308 | /* Do 2nd fork, as-per recommended practice for launching daemons. */ | |
309 | pid = fork(); | |
310 | ||
311 | if (pid < 0) { | |
fe35de69 | 312 | LOG_FATAL(LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno)); |
fe4b661f ML |
313 | } else if (pid > 0) { |
314 | exit(0); /* In the 'parent' */ | |
315 | } else { | |
316 | /* In the child we want to leave running as the daemon */ | |
317 | ||
2a305d8e ML |
318 | /* Change current directory to / */ |
319 | if (chdir("/") < 0) { | |
fe35de69 | 320 | LOG_FATAL(LOGF_Logging, "Could not chdir to / : %s", strerror(errno)); |
2a305d8e ML |
321 | } |
322 | ||
1d2a0856 ML |
323 | /* Don't keep stdin/out/err from before. But don't close |
324 | the parent pipe yet. */ | |
fe4b661f | 325 | for (fd=0; fd<1024; fd++) { |
1d2a0856 ML |
326 | if (fd != pipefd[1]) |
327 | close(fd); | |
fe4b661f | 328 | } |
919b5b5a | 329 | |
1d2a0856 | 330 | LOG_SetParentFd(pipefd[1]); |
fe4b661f ML |
331 | } |
332 | } | |
333 | ||
334 | #endif | |
335 | } | |
336 | ||
337 | /* ================================================== */ | |
338 | ||
88840341 RC |
339 | int main |
340 | (int argc, char **argv) | |
341 | { | |
0f8def4c | 342 | const char *conf_file = DEFAULT_CONF_FILE; |
be42b4ee | 343 | char *user = NULL; |
72d0b3c9 | 344 | int debug = 0, nofork = 0, address_family = IPADDR_UNSPEC; |
f2eb6b16 | 345 | int do_init_rtc = 0, restarted = 0; |
88840341 | 346 | int other_pid; |
e3234465 | 347 | int lock_memory = 0, sched_priority = 0; |
788e7fcd | 348 | int system_log = 1; |
3edd3fe5 | 349 | int config_args = 0; |
35e662d8 | 350 | |
88840341 RC |
351 | LOG_Initialise(); |
352 | ||
353 | /* Parse command line options */ | |
354 | while (++argv, (--argc)>0) { | |
355 | ||
356 | if (!strcmp("-f", *argv)) { | |
357 | ++argv, --argc; | |
358 | conf_file = *argv; | |
35e662d8 JH |
359 | } else if (!strcmp("-P", *argv)) { |
360 | ++argv, --argc; | |
e3234465 ML |
361 | if (argc == 0 || sscanf(*argv, "%d", &sched_priority) != 1) { |
362 | LOG_FATAL(LOGF_Main, "Bad scheduler priority"); | |
35e662d8 | 363 | } |
35e662d8 | 364 | } else if (!strcmp("-m", *argv)) { |
e3234465 | 365 | lock_memory = 1; |
88840341 RC |
366 | } else if (!strcmp("-r", *argv)) { |
367 | reload = 1; | |
f2eb6b16 ML |
368 | } else if (!strcmp("-R", *argv)) { |
369 | restarted = 1; | |
be42b4ee ML |
370 | } else if (!strcmp("-u", *argv)) { |
371 | ++argv, --argc; | |
e3234465 ML |
372 | if (argc == 0) { |
373 | LOG_FATAL(LOGF_Main, "Missing user name"); | |
374 | } else { | |
375 | user = *argv; | |
376 | } | |
88840341 RC |
377 | } else if (!strcmp("-s", *argv)) { |
378 | do_init_rtc = 1; | |
379 | } else if (!strcmp("-v", *argv) || !strcmp("--version",*argv)) { | |
380 | /* This write to the terminal is OK, it comes before we turn into a daemon */ | |
4ba3dd66 | 381 | printf("chronyd (chrony) version %s\n", CHRONY_VERSION); |
88840341 | 382 | exit(0); |
fe4b661f ML |
383 | } else if (!strcmp("-n", *argv)) { |
384 | nofork = 1; | |
88840341 | 385 | } else if (!strcmp("-d", *argv)) { |
4bbc5520 | 386 | debug++; |
fe4b661f | 387 | nofork = 1; |
788e7fcd | 388 | system_log = 0; |
70feea48 ML |
389 | } else if (!strcmp("-q", *argv)) { |
390 | ref_mode = REF_ModeUpdateOnce; | |
391 | nofork = 1; | |
392 | system_log = 0; | |
393 | } else if (!strcmp("-Q", *argv)) { | |
394 | ref_mode = REF_ModePrintOnce; | |
395 | nofork = 1; | |
396 | system_log = 0; | |
fbd20c42 | 397 | } else if (!strcmp("-4", *argv)) { |
72d0b3c9 | 398 | address_family = IPADDR_INET4; |
fbd20c42 | 399 | } else if (!strcmp("-6", *argv)) { |
72d0b3c9 | 400 | address_family = IPADDR_INET6; |
3edd3fe5 | 401 | } else if (*argv[0] == '-') { |
dbb550e6 | 402 | LOG_FATAL(LOGF_Main, "Unrecognized command line option [%s]", *argv); |
3edd3fe5 ML |
403 | } else { |
404 | /* Process remaining arguments and configuration lines */ | |
405 | config_args = argc; | |
406 | break; | |
88840341 RC |
407 | } |
408 | } | |
409 | ||
88840341 RC |
410 | if (getuid() != 0) { |
411 | /* This write to the terminal is OK, it comes before we turn into a daemon */ | |
412 | fprintf(stderr,"Not superuser\n"); | |
413 | exit(1); | |
414 | } | |
415 | ||
88840341 | 416 | /* Turn into a daemon */ |
fe4b661f ML |
417 | if (!nofork) { |
418 | go_daemon(); | |
419 | } | |
420 | ||
788e7fcd | 421 | if (system_log) { |
fe4b661f | 422 | LOG_OpenSystemLog(); |
88840341 RC |
423 | } |
424 | ||
788e7fcd | 425 | LOG_SetDebugLevel(debug); |
4bbc5520 | 426 | |
4ba3dd66 | 427 | LOG(LOGS_INFO, LOGF_Main, "chronyd version %s starting", CHRONY_VERSION); |
cb905507 | 428 | |
72d0b3c9 ML |
429 | DNS_SetAddressFamily(address_family); |
430 | ||
f2eb6b16 | 431 | CNF_SetRestarted(restarted); |
3edd3fe5 ML |
432 | |
433 | /* Parse the config file or the remaining command line arguments */ | |
434 | if (!config_args) { | |
435 | CNF_ReadFile(conf_file); | |
436 | } else { | |
437 | do { | |
438 | CNF_ParseLine(NULL, config_args - argc + 1, *argv); | |
439 | } while (++argv, --argc); | |
440 | } | |
1e35b268 | 441 | |
88840341 RC |
442 | /* Check whether another chronyd may already be running. Do this after |
443 | * forking, so that message logging goes to the right place (i.e. syslog), in | |
444 | * case this chronyd is being run from a boot script. */ | |
445 | if (maybe_another_chronyd_running(&other_pid)) { | |
446 | LOG_FATAL(LOGF_Main, "Another chronyd may already be running (pid=%d), check lockfile (%s)", | |
447 | other_pid, CNF_GetPidFile()); | |
88840341 RC |
448 | } |
449 | ||
450 | /* Write our lockfile to prevent other chronyds running. This has *GOT* to | |
451 | * be done *AFTER* the daemon-creation fork() */ | |
452 | write_lockfile(); | |
88840341 | 453 | |
88840341 RC |
454 | if (do_init_rtc) { |
455 | RTC_TimePreInit(); | |
456 | } | |
457 | ||
458 | LCL_Initialise(); | |
459 | SCH_Initialise(); | |
460 | SYS_Initialise(); | |
72d0b3c9 ML |
461 | NIO_Initialise(address_family); |
462 | CAM_Initialise(address_family); | |
be42b4ee | 463 | RTC_Initialise(); |
3a222336 | 464 | SRC_Initialise(); |
ac30bb06 | 465 | RCL_Initialise(); |
1c901b82 | 466 | KEY_Initialise(); |
be42b4ee | 467 | |
e3234465 ML |
468 | /* Command-line switch must have priority */ |
469 | if (!sched_priority) { | |
470 | sched_priority = CNF_GetSchedPriority(); | |
471 | } | |
472 | if (sched_priority) { | |
473 | SYS_SetScheduler(sched_priority); | |
96759116 ML |
474 | } |
475 | ||
e3234465 ML |
476 | if (lock_memory || CNF_GetLockMemory()) { |
477 | SYS_LockMemory(); | |
96759116 ML |
478 | } |
479 | ||
edda0c60 ML |
480 | if (!user) { |
481 | user = CNF_GetUser(); | |
482 | } | |
ff31702f | 483 | if (user && strcmp(user, "root")) { |
be42b4ee | 484 | SYS_DropRoot(user); |
e3234465 | 485 | } |
be42b4ee | 486 | |
103a520a ML |
487 | LOG_CreateLogFileDir(); |
488 | ||
88840341 RC |
489 | REF_Initialise(); |
490 | SST_Initialise(); | |
88840341 RC |
491 | BRD_Initialise(); |
492 | NCR_Initialise(); | |
493 | NSR_Initialise(); | |
88840341 | 494 | CLG_Initialise(); |
88840341 | 495 | MNL_Initialise(); |
c386d117 | 496 | TMC_Initialise(); |
88840341 RC |
497 | |
498 | /* From now on, it is safe to do finalisation on exit */ | |
499 | initialised = 1; | |
500 | ||
46951b85 ML |
501 | CNF_SetupAccessRestrictions(); |
502 | ||
70feea48 | 503 | if (ref_mode == REF_ModeNormal && CNF_GetInitSources() > 0) { |
7fda9c67 ML |
504 | ref_mode = REF_ModeInitStepSlew; |
505 | } | |
506 | ||
507 | REF_SetModeEndHandler(reference_mode_end); | |
508 | REF_SetMode(ref_mode); | |
509 | ||
88840341 RC |
510 | if (do_init_rtc) { |
511 | RTC_TimeInit(post_init_rtc_hook, NULL); | |
512 | } else { | |
513 | post_init_rtc_hook(NULL); | |
514 | } | |
515 | ||
516 | signal(SIGINT, signal_cleanup); | |
517 | signal(SIGTERM, signal_cleanup); | |
518 | #if !defined(WINNT) | |
519 | signal(SIGQUIT, signal_cleanup); | |
520 | signal(SIGHUP, signal_cleanup); | |
521 | #endif /* WINNT */ | |
522 | ||
523 | /* The program normally runs under control of the main loop in | |
524 | the scheduler. */ | |
525 | SCH_MainLoop(); | |
526 | ||
0fc9b555 ML |
527 | LOG(LOGS_INFO, LOGF_Main, "chronyd exiting"); |
528 | ||
88840341 RC |
529 | MAI_CleanupAndExit(); |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | /* ================================================== */ |