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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 | |
7fda9c67 | 126 | post_init_ntp_hook(void *anything) |
88840341 | 127 | { |
7fda9c67 ML |
128 | if (ref_mode == REF_ModeInitStepSlew) { |
129 | /* Remove the initstepslew sources and set normal mode */ | |
130 | NSR_RemoveAllSources(); | |
131 | ref_mode = REF_ModeNormal; | |
132 | REF_SetMode(ref_mode); | |
133 | } | |
134 | ||
1d2a0856 ML |
135 | /* Close the pipe to the foreground process so it can exit */ |
136 | LOG_CloseParentFd(); | |
88840341 RC |
137 | |
138 | CNF_AddSources(); | |
139 | CNF_AddBroadcasts(); | |
140 | if (reload) { | |
141 | /* Note, we want reload to come well after the initialisation from | |
142 | the real time clock - this gives us a fighting chance that the | |
143 | system-clock scale for the reloaded samples still has a | |
144 | semblence of validity about it. */ | |
145 | SRC_ReloadSources(); | |
146 | } | |
88840341 RC |
147 | |
148 | RTC_StartMeasurements(); | |
ac30bb06 | 149 | RCL_StartRefclocks(); |
70feea48 ML |
150 | |
151 | /* Special modes can end only when sources update their reachability. | |
7fa22d4c ML |
152 | Give up immediatelly if there are no active sources. */ |
153 | if (ref_mode != REF_ModeNormal && !SRC_ActiveSources()) { | |
70feea48 ML |
154 | REF_SetUnsynchronised(); |
155 | } | |
88840341 RC |
156 | } |
157 | ||
158 | /* ================================================== */ | |
159 | ||
7fda9c67 ML |
160 | static void |
161 | reference_mode_end(int result) | |
162 | { | |
163 | switch (ref_mode) { | |
164 | case REF_ModeNormal: | |
70feea48 ML |
165 | case REF_ModeUpdateOnce: |
166 | case REF_ModePrintOnce: | |
93b66ac1 ML |
167 | exit_status = !result; |
168 | SCH_QuitProgram(); | |
7fda9c67 ML |
169 | break; |
170 | case REF_ModeInitStepSlew: | |
171 | /* post_init_ntp_hook removes sources and a source call is | |
172 | on the stack here, so it can't be called directly */ | |
173 | SCH_AddTimeoutByDelay(0.0, post_init_ntp_hook, NULL); | |
174 | break; | |
175 | default: | |
176 | assert(0); | |
177 | } | |
178 | } | |
179 | ||
180 | /* ================================================== */ | |
181 | ||
88840341 RC |
182 | static void |
183 | post_init_rtc_hook(void *anything) | |
184 | { | |
7fda9c67 ML |
185 | if (CNF_GetInitSources() > 0) { |
186 | CNF_AddInitSources(); | |
187 | assert(REF_GetMode() != REF_ModeNormal); | |
188 | /* Wait for mode end notification */ | |
189 | } else { | |
190 | (post_init_ntp_hook)(NULL); | |
191 | } | |
88840341 RC |
192 | } |
193 | ||
194 | /* ================================================== */ | |
195 | /* Return 1 if the process exists on the system. */ | |
196 | ||
197 | static int | |
198 | does_process_exist(int pid) | |
199 | { | |
200 | int status; | |
201 | status = getsid(pid); | |
202 | if (status >= 0) { | |
203 | return 1; | |
204 | } else { | |
205 | return 0; | |
206 | } | |
207 | } | |
208 | ||
209 | /* ================================================== */ | |
210 | ||
211 | static int | |
212 | maybe_another_chronyd_running(int *other_pid) | |
213 | { | |
214 | const char *pidfile = CNF_GetPidFile(); | |
215 | FILE *in; | |
216 | int pid, count; | |
217 | ||
218 | *other_pid = 0; | |
219 | ||
220 | in = fopen(pidfile, "r"); | |
221 | if (!in) return 0; | |
222 | ||
223 | count = fscanf(in, "%d", &pid); | |
224 | fclose(in); | |
225 | ||
226 | if (count != 1) return 0; | |
227 | ||
228 | *other_pid = pid; | |
229 | return does_process_exist(pid); | |
230 | ||
231 | } | |
232 | ||
233 | /* ================================================== */ | |
234 | ||
235 | static void | |
236 | write_lockfile(void) | |
237 | { | |
238 | const char *pidfile = CNF_GetPidFile(); | |
239 | FILE *out; | |
240 | ||
241 | out = fopen(pidfile, "w"); | |
242 | if (!out) { | |
243 | LOG(LOGS_ERR, LOGF_Main, "could not open lockfile %s for writing", pidfile); | |
244 | } else { | |
245 | fprintf(out, "%d\n", getpid()); | |
246 | fclose(out); | |
247 | } | |
248 | } | |
249 | ||
250 | /* ================================================== */ | |
251 | ||
fe4b661f ML |
252 | static void |
253 | go_daemon(void) | |
254 | { | |
255 | #ifdef WINNT | |
256 | ||
257 | ||
258 | #else | |
259 | ||
1d2a0856 ML |
260 | int pid, fd, pipefd[2]; |
261 | ||
262 | /* Create pipe which will the daemon use to notify the grandparent | |
263 | when it's initialised or send an error message */ | |
264 | if (pipe(pipefd)) { | |
265 | LOG(LOGS_ERR, LOGF_Logging, "Could not detach, pipe failed : %s", strerror(errno)); | |
266 | } | |
fe4b661f ML |
267 | |
268 | /* Does this preserve existing signal handlers? */ | |
269 | pid = fork(); | |
270 | ||
271 | if (pid < 0) { | |
272 | LOG(LOGS_ERR, LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno)); | |
273 | } else if (pid > 0) { | |
1d2a0856 ML |
274 | /* In the 'grandparent' */ |
275 | char message[1024]; | |
276 | int r; | |
277 | ||
278 | close(pipefd[1]); | |
279 | r = read(pipefd[0], message, sizeof (message)); | |
280 | if (r) { | |
281 | if (r > 0) { | |
282 | /* Print the error message from the child */ | |
283 | fprintf(stderr, "%.1024s\n", message); | |
284 | } | |
285 | exit(1); | |
286 | } else | |
287 | exit(0); | |
fe4b661f | 288 | } else { |
1d2a0856 | 289 | close(pipefd[0]); |
fe4b661f ML |
290 | |
291 | setsid(); | |
292 | ||
293 | /* Do 2nd fork, as-per recommended practice for launching daemons. */ | |
294 | pid = fork(); | |
295 | ||
296 | if (pid < 0) { | |
297 | LOG(LOGS_ERR, LOGF_Logging, "Could not detach, fork failed : %s", strerror(errno)); | |
298 | } else if (pid > 0) { | |
299 | exit(0); /* In the 'parent' */ | |
300 | } else { | |
301 | /* In the child we want to leave running as the daemon */ | |
302 | ||
2a305d8e ML |
303 | /* Change current directory to / */ |
304 | if (chdir("/") < 0) { | |
305 | LOG(LOGS_ERR, LOGF_Logging, "Could not chdir to / : %s", strerror(errno)); | |
306 | } | |
307 | ||
1d2a0856 ML |
308 | /* Don't keep stdin/out/err from before. But don't close |
309 | the parent pipe yet. */ | |
fe4b661f | 310 | for (fd=0; fd<1024; fd++) { |
1d2a0856 ML |
311 | if (fd != pipefd[1]) |
312 | close(fd); | |
fe4b661f | 313 | } |
919b5b5a | 314 | |
1d2a0856 | 315 | LOG_SetParentFd(pipefd[1]); |
fe4b661f ML |
316 | } |
317 | } | |
318 | ||
319 | #endif | |
320 | } | |
321 | ||
322 | /* ================================================== */ | |
323 | ||
88840341 RC |
324 | int main |
325 | (int argc, char **argv) | |
326 | { | |
0f8def4c | 327 | const char *conf_file = DEFAULT_CONF_FILE; |
be42b4ee | 328 | char *user = NULL; |
72d0b3c9 | 329 | int debug = 0, nofork = 0, address_family = IPADDR_UNSPEC; |
f2eb6b16 | 330 | int do_init_rtc = 0, restarted = 0; |
88840341 | 331 | int other_pid; |
e3234465 | 332 | int lock_memory = 0, sched_priority = 0; |
788e7fcd | 333 | int system_log = 1; |
3edd3fe5 | 334 | int config_args = 0; |
35e662d8 | 335 | |
88840341 RC |
336 | LOG_Initialise(); |
337 | ||
338 | /* Parse command line options */ | |
339 | while (++argv, (--argc)>0) { | |
340 | ||
341 | if (!strcmp("-f", *argv)) { | |
342 | ++argv, --argc; | |
343 | conf_file = *argv; | |
35e662d8 JH |
344 | } else if (!strcmp("-P", *argv)) { |
345 | ++argv, --argc; | |
e3234465 ML |
346 | if (argc == 0 || sscanf(*argv, "%d", &sched_priority) != 1) { |
347 | LOG_FATAL(LOGF_Main, "Bad scheduler priority"); | |
35e662d8 | 348 | } |
35e662d8 | 349 | } else if (!strcmp("-m", *argv)) { |
e3234465 | 350 | lock_memory = 1; |
88840341 RC |
351 | } else if (!strcmp("-r", *argv)) { |
352 | reload = 1; | |
f2eb6b16 ML |
353 | } else if (!strcmp("-R", *argv)) { |
354 | restarted = 1; | |
be42b4ee ML |
355 | } else if (!strcmp("-u", *argv)) { |
356 | ++argv, --argc; | |
e3234465 ML |
357 | if (argc == 0) { |
358 | LOG_FATAL(LOGF_Main, "Missing user name"); | |
359 | } else { | |
360 | user = *argv; | |
361 | } | |
88840341 RC |
362 | } else if (!strcmp("-s", *argv)) { |
363 | do_init_rtc = 1; | |
364 | } else if (!strcmp("-v", *argv) || !strcmp("--version",*argv)) { | |
365 | /* This write to the terminal is OK, it comes before we turn into a daemon */ | |
4ba3dd66 | 366 | printf("chronyd (chrony) version %s\n", CHRONY_VERSION); |
88840341 | 367 | exit(0); |
fe4b661f ML |
368 | } else if (!strcmp("-n", *argv)) { |
369 | nofork = 1; | |
88840341 | 370 | } else if (!strcmp("-d", *argv)) { |
4bbc5520 | 371 | debug++; |
fe4b661f | 372 | nofork = 1; |
788e7fcd | 373 | system_log = 0; |
70feea48 ML |
374 | } else if (!strcmp("-q", *argv)) { |
375 | ref_mode = REF_ModeUpdateOnce; | |
376 | nofork = 1; | |
377 | system_log = 0; | |
378 | } else if (!strcmp("-Q", *argv)) { | |
379 | ref_mode = REF_ModePrintOnce; | |
380 | nofork = 1; | |
381 | system_log = 0; | |
fbd20c42 | 382 | } else if (!strcmp("-4", *argv)) { |
72d0b3c9 | 383 | address_family = IPADDR_INET4; |
fbd20c42 | 384 | } else if (!strcmp("-6", *argv)) { |
72d0b3c9 | 385 | address_family = IPADDR_INET6; |
3edd3fe5 | 386 | } else if (*argv[0] == '-') { |
dbb550e6 | 387 | LOG_FATAL(LOGF_Main, "Unrecognized command line option [%s]", *argv); |
3edd3fe5 ML |
388 | } else { |
389 | /* Process remaining arguments and configuration lines */ | |
390 | config_args = argc; | |
391 | break; | |
88840341 RC |
392 | } |
393 | } | |
394 | ||
88840341 RC |
395 | if (getuid() != 0) { |
396 | /* This write to the terminal is OK, it comes before we turn into a daemon */ | |
397 | fprintf(stderr,"Not superuser\n"); | |
398 | exit(1); | |
399 | } | |
400 | ||
88840341 | 401 | /* Turn into a daemon */ |
fe4b661f ML |
402 | if (!nofork) { |
403 | go_daemon(); | |
404 | } | |
405 | ||
788e7fcd | 406 | if (system_log) { |
fe4b661f | 407 | LOG_OpenSystemLog(); |
88840341 RC |
408 | } |
409 | ||
788e7fcd | 410 | LOG_SetDebugLevel(debug); |
4bbc5520 | 411 | |
4ba3dd66 | 412 | LOG(LOGS_INFO, LOGF_Main, "chronyd version %s starting", CHRONY_VERSION); |
cb905507 | 413 | |
72d0b3c9 ML |
414 | DNS_SetAddressFamily(address_family); |
415 | ||
f2eb6b16 | 416 | CNF_SetRestarted(restarted); |
3edd3fe5 ML |
417 | |
418 | /* Parse the config file or the remaining command line arguments */ | |
419 | if (!config_args) { | |
420 | CNF_ReadFile(conf_file); | |
421 | } else { | |
422 | do { | |
423 | CNF_ParseLine(NULL, config_args - argc + 1, *argv); | |
424 | } while (++argv, --argc); | |
425 | } | |
1e35b268 | 426 | |
88840341 RC |
427 | /* Check whether another chronyd may already be running. Do this after |
428 | * forking, so that message logging goes to the right place (i.e. syslog), in | |
429 | * case this chronyd is being run from a boot script. */ | |
430 | if (maybe_another_chronyd_running(&other_pid)) { | |
431 | LOG_FATAL(LOGF_Main, "Another chronyd may already be running (pid=%d), check lockfile (%s)", | |
432 | other_pid, CNF_GetPidFile()); | |
88840341 RC |
433 | } |
434 | ||
435 | /* Write our lockfile to prevent other chronyds running. This has *GOT* to | |
436 | * be done *AFTER* the daemon-creation fork() */ | |
437 | write_lockfile(); | |
88840341 | 438 | |
88840341 RC |
439 | if (do_init_rtc) { |
440 | RTC_TimePreInit(); | |
441 | } | |
442 | ||
443 | LCL_Initialise(); | |
444 | SCH_Initialise(); | |
445 | SYS_Initialise(); | |
72d0b3c9 ML |
446 | NIO_Initialise(address_family); |
447 | CAM_Initialise(address_family); | |
be42b4ee | 448 | RTC_Initialise(); |
3a222336 | 449 | SRC_Initialise(); |
ac30bb06 | 450 | RCL_Initialise(); |
1c901b82 | 451 | KEY_Initialise(); |
be42b4ee | 452 | |
e3234465 ML |
453 | /* Command-line switch must have priority */ |
454 | if (!sched_priority) { | |
455 | sched_priority = CNF_GetSchedPriority(); | |
456 | } | |
457 | if (sched_priority) { | |
458 | SYS_SetScheduler(sched_priority); | |
96759116 ML |
459 | } |
460 | ||
e3234465 ML |
461 | if (lock_memory || CNF_GetLockMemory()) { |
462 | SYS_LockMemory(); | |
96759116 ML |
463 | } |
464 | ||
edda0c60 ML |
465 | if (!user) { |
466 | user = CNF_GetUser(); | |
467 | } | |
ff31702f | 468 | if (user && strcmp(user, "root")) { |
be42b4ee | 469 | SYS_DropRoot(user); |
e3234465 | 470 | } |
be42b4ee | 471 | |
103a520a ML |
472 | LOG_CreateLogFileDir(); |
473 | ||
88840341 RC |
474 | REF_Initialise(); |
475 | SST_Initialise(); | |
88840341 RC |
476 | BRD_Initialise(); |
477 | NCR_Initialise(); | |
478 | NSR_Initialise(); | |
88840341 | 479 | CLG_Initialise(); |
88840341 | 480 | MNL_Initialise(); |
c386d117 | 481 | TMC_Initialise(); |
88840341 RC |
482 | |
483 | /* From now on, it is safe to do finalisation on exit */ | |
484 | initialised = 1; | |
485 | ||
46951b85 ML |
486 | CNF_SetupAccessRestrictions(); |
487 | ||
70feea48 | 488 | if (ref_mode == REF_ModeNormal && CNF_GetInitSources() > 0) { |
7fda9c67 ML |
489 | ref_mode = REF_ModeInitStepSlew; |
490 | } | |
491 | ||
492 | REF_SetModeEndHandler(reference_mode_end); | |
493 | REF_SetMode(ref_mode); | |
494 | ||
88840341 RC |
495 | if (do_init_rtc) { |
496 | RTC_TimeInit(post_init_rtc_hook, NULL); | |
497 | } else { | |
498 | post_init_rtc_hook(NULL); | |
499 | } | |
500 | ||
501 | signal(SIGINT, signal_cleanup); | |
502 | signal(SIGTERM, signal_cleanup); | |
503 | #if !defined(WINNT) | |
504 | signal(SIGQUIT, signal_cleanup); | |
505 | signal(SIGHUP, signal_cleanup); | |
506 | #endif /* WINNT */ | |
507 | ||
508 | /* The program normally runs under control of the main loop in | |
509 | the scheduler. */ | |
510 | SCH_MainLoop(); | |
511 | ||
0fc9b555 ML |
512 | LOG(LOGS_INFO, LOGF_Main, "chronyd exiting"); |
513 | ||
88840341 RC |
514 | MAI_CleanupAndExit(); |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | /* ================================================== */ |