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1 | /* $Id$ | |
2 | * | |
3 | * The Data Control Manager for Moira. | |
4 | * | |
5 | * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology. | |
6 | * For copying and distribution information, see the file | |
7 | * <mit-copyright.h>. | |
8 | */ | |
9 | ||
10 | #include <mit-copyright.h> | |
11 | #include <moira.h> | |
12 | #include <moira_site.h> | |
13 | #include <moira_schema.h> | |
14 | #include "update.h" | |
15 | ||
16 | #include <sys/param.h> | |
17 | #include <sys/stat.h> | |
18 | #include <sys/wait.h> | |
19 | ||
20 | #include <errno.h> | |
21 | #include <signal.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | EXEC SQL INCLUDE sqlca; | |
28 | void sqlglm(char *, unsigned int *, unsigned int *); | |
29 | ||
30 | RCSID("$Header$"); | |
31 | ||
32 | int generate_service(char *name, int force); | |
33 | void do_hosts(char *service); | |
34 | int dcm_send_file(char *service, int type, char *host, char *target); | |
35 | int dcm_execute(char *service, char *host, char *script); | |
36 | void dbmserr(void); | |
37 | ||
38 | #define SQL_NO_MATCH 1403 | |
39 | #define SOFT_FAIL(x) (((x) == MR_NO_MEM) || ((x) == MR_CANT_CONNECT) || ((x) == MR_CCONFIG) || ((x) == MR_DEADLOCK) || ((x) == MR_BUSY) || ((x) == MR_ABORT)) | |
40 | ||
41 | /* argument parsing macro */ | |
42 | #define argis(a, b) (!strcmp(*arg + 1, a) || !strcmp(*arg + 1, b)) | |
43 | ||
44 | char whobuf[256], *whoami = whobuf, *db = "moira"; | |
45 | ||
46 | enum { UNIQUE, DISTRIBUTED, REPLICATED }; | |
47 | ||
48 | int main(int argc, char **argv) | |
49 | { | |
50 | int i, force = 0; | |
51 | EXEC SQL BEGIN DECLARE SECTION; | |
52 | char buf[SERVERS_NAME_SIZE], *name; | |
53 | int enable; | |
54 | EXEC SQL END DECLARE SECTION; | |
55 | struct save_queue *sq; | |
56 | int status, srvcnt = 0; | |
57 | char **arg = argv, *services[BUFSIZ]; | |
58 | ||
59 | if (strchr(argv[0], '/')) | |
60 | strcpy(whoami, strrchr(argv[0], '/') + 1); | |
61 | else strcpy(whoami, argv[0]); | |
62 | umask(7); | |
63 | ||
64 | setvbuf(stderr, NULL, _IOLBF, BUFSIZ); | |
65 | setvbuf(stdout, NULL, _IOLBF, BUFSIZ); | |
66 | ||
67 | initialize_sms_error_table(); | |
68 | initialize_krb_error_table(); | |
69 | ||
70 | while (++arg - argv < argc) | |
71 | { | |
72 | if (**arg == '-') | |
73 | { | |
74 | if (argis("f", "force")) | |
75 | force++; | |
76 | else | |
77 | { | |
78 | com_err(whoami, 0, "Usage: %s [-f] servicename", argv[0]); | |
79 | exit(1); | |
80 | } | |
81 | } | |
82 | else | |
83 | /* Doesn't begin with a dash, is a service name. | |
84 | * Build an array of them we can iterate through later. | |
85 | */ | |
86 | { | |
87 | services[srvcnt] = malloc(SERVERS_NAME_SIZE); | |
88 | if (!services[srvcnt]) | |
89 | { | |
90 | com_err(whoami, 0, "Out of memory!"); | |
91 | exit(1); | |
92 | } | |
93 | strncpy(services[srvcnt], *arg, SERVERS_NAME_SIZE); | |
94 | srvcnt++; | |
95 | } | |
96 | } | |
97 | ||
98 | /* Iterate through services specified on the command line, if any. */ | |
99 | if (srvcnt > 0) | |
100 | { | |
101 | for (i = 0; i < srvcnt; i++) | |
102 | { | |
103 | if (generate_service(services[i], force)) | |
104 | { | |
105 | do_hosts(services[i]); | |
106 | free(services[i]); | |
107 | } | |
108 | } | |
109 | exit(0); | |
110 | } | |
111 | ||
112 | /* if DCM is not enabled, exit after logging */ | |
113 | if (!access(NODCMFILE, F_OK)) | |
114 | { | |
115 | printf("/etc/nodcm exists -- exiting\n"); | |
116 | exit(1); | |
117 | } | |
118 | ||
119 | EXEC SQL WHENEVER SQLERROR DO dbmserr(); | |
120 | ||
121 | EXEC SQL CONNECT :db IDENTIFIED BY :db; | |
122 | ||
123 | EXEC SQL SELECT value INTO :enable FROM numvalues WHERE name = 'dcm_enable'; | |
124 | if (enable == 0) | |
125 | { | |
126 | printf("dcm_enable not set -- exiting\n"); | |
127 | exit(1); | |
128 | } | |
129 | ||
130 | /* fetch list of services */ | |
131 | EXEC SQL DECLARE csr_svc CURSOR FOR SELECT LOWER(name) FROM servers | |
132 | WHERE enable = 1 AND harderror = 0 AND update_int > 0; | |
133 | EXEC SQL OPEN csr_svc; | |
134 | sq = sq_create(); | |
135 | while (1) | |
136 | { | |
137 | EXEC SQL FETCH csr_svc INTO :buf; | |
138 | if (sqlca.sqlcode) | |
139 | break; | |
140 | ||
141 | sq_save_data(sq, strdup(strtrim(buf))); | |
142 | } | |
143 | EXEC SQL CLOSE csr_svc; | |
144 | /* we will repeatedly open and close the db since it seems to get | |
145 | upset if you keep it open across a fork */ | |
146 | EXEC SQL COMMIT RELEASE; | |
147 | ||
148 | /* Now run through list */ | |
149 | while (sq_get_data(sq, &name)) | |
150 | { | |
151 | if (generate_service(name, force)) | |
152 | { | |
153 | switch (fork()) | |
154 | { | |
155 | case -1: | |
156 | com_err(whoami, errno, "forking for service %s -- exiting", | |
157 | name); | |
158 | exit(1); | |
159 | case 0: | |
160 | sprintf(strchr(whoami, '\0'), " (%s:%ld)", name, (long)getpid()); | |
161 | do_hosts(name); | |
162 | com_err(whoami, 0, "exiting"); | |
163 | exit(0); | |
164 | default: | |
165 | break; | |
166 | } | |
167 | } | |
168 | } | |
169 | ||
170 | com_err(whoami, 0, "All files generated. Waiting for children to exit"); | |
171 | while (waitpid(0, &status, 0) > 0) | |
172 | ; | |
173 | com_err(whoami, 0, "exiting"); | |
174 | exit(0); | |
175 | } | |
176 | ||
177 | int generate_service(char *name, int force) | |
178 | { | |
179 | EXEC SQL BEGIN DECLARE SECTION; | |
180 | int interval, dfcheck, status, inprogress; | |
181 | time_t now; | |
182 | const char *errmsg; | |
183 | EXEC SQL END DECLARE SECTION; | |
184 | char dfgen_prog[MAXPATHLEN], dfgen_cmd[2 * MAXPATHLEN]; | |
185 | struct sigaction action, prevaction; | |
186 | int waits; | |
187 | ||
188 | EXEC SQL CONNECT :db IDENTIFIED BY :db; | |
189 | ||
190 | EXEC SQL SELECT update_int, dfcheck, inprogress INTO :interval, :dfcheck, | |
191 | :inprogress FROM servers WHERE name = UPPER(:name); | |
192 | if (sqlca.sqlcode == SQL_NO_MATCH) | |
193 | { | |
194 | com_err(whoami, 0, "No such service `%s'", name); | |
195 | EXEC SQL COMMIT RELEASE; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | /* Someone might try to run a DCM from the command line while the | |
200 | * regular one is running, which will bypass the "interval" test. | |
201 | * Check inprogress to make sure they don't stomp on themselves. | |
202 | * | |
203 | * Note that there is still a race condition here, and this doesn't | |
204 | * absolutely prevent 2 DCMs from stepping on one another, but it | |
205 | * does reduce the window of vulnerability greatly. | |
206 | */ | |
207 | if (inprogress == 1) | |
208 | { | |
209 | com_err(whoami, 0, "DCM for service `%s' already in progress", name); | |
210 | EXEC SQL COMMIT RELEASE; | |
211 | return 0; | |
212 | } | |
213 | ||
214 | time(&now); | |
215 | ||
216 | if ((interval * 60 + dfcheck < now) || force) | |
217 | { | |
218 | sprintf(dfgen_prog, "%s/%s.gen", BIN_DIR, name); | |
219 | if (access(dfgen_prog, F_OK) != 0) | |
220 | { | |
221 | com_err(whoami, 0, "prog %s doesn't exist", dfgen_prog); | |
222 | EXEC SQL COMMIT RELEASE; | |
223 | return 0; | |
224 | } | |
225 | sprintf(dfgen_cmd, "exec %s %s/%s.out", dfgen_prog, DCM_DIR, name); | |
226 | com_err(whoami, 0, "running %s", dfgen_prog); | |
227 | ||
228 | EXEC SQL WHENEVER SQLERROR GOTO gen_cleanup; | |
229 | ||
230 | EXEC SQL UPDATE servers SET inprogress = 1 | |
231 | WHERE name = UPPER(:name); | |
232 | EXEC SQL COMMIT; | |
233 | ||
234 | action.sa_flags = 0; | |
235 | sigemptyset(&action.sa_mask); | |
236 | action.sa_handler = SIG_DFL; | |
237 | sigaction(SIGCHLD, &action, &prevaction); | |
238 | waits = system(dfgen_cmd); | |
239 | sigaction(SIGCHLD, &prevaction, NULL); | |
240 | if (WIFSIGNALED(waits)) | |
241 | { | |
242 | status = MR_COREDUMP; | |
243 | com_err(whoami, status, " %s exited on signal %d", | |
244 | dfgen_prog, WTERMSIG(waits)); | |
245 | } | |
246 | else if (WEXITSTATUS(waits)) | |
247 | { | |
248 | /* extract the process's exit value */ | |
249 | status = WEXITSTATUS(waits) + ERROR_TABLE_BASE_sms; | |
250 | if (status != MR_NO_CHANGE) | |
251 | com_err(whoami, status, "in %s", dfgen_prog); | |
252 | } | |
253 | else | |
254 | status = MR_SUCCESS; | |
255 | ||
256 | if (status == MR_SUCCESS) | |
257 | { | |
258 | EXEC SQL UPDATE servers SET dfgen = :now, dfcheck = :now, | |
259 | inprogress = 0 WHERE name = UPPER(:name); | |
260 | EXEC SQL COMMIT RELEASE; | |
261 | return 1; | |
262 | } | |
263 | else if (status == MR_NO_CHANGE) | |
264 | { | |
265 | EXEC SQL UPDATE servers SET dfcheck = :now, inprogress = 0 | |
266 | WHERE name = UPPER(:name); | |
267 | } | |
268 | else if (SOFT_FAIL(status)) | |
269 | { | |
270 | errmsg = error_message(status); | |
271 | EXEC SQL UPDATE servers SET errmsg = :errmsg, inprogress = 0 | |
272 | WHERE name = UPPER(:name); | |
273 | } | |
274 | else /* HARD_FAIL(status) */ | |
275 | { | |
276 | errmsg = error_message(status); | |
277 | EXEC SQL UPDATE servers SET harderror = :status, errmsg = :errmsg, | |
278 | inprogress = 0 WHERE name = UPPER(:name); | |
279 | critical_alert("DCM", "DCM building config files for %s: %s", | |
280 | name, errmsg); | |
281 | } | |
282 | } | |
283 | else | |
284 | { | |
285 | com_err(whoami, 0, "DCM for service `%s' has run too recently.", name); | |
286 | com_err(whoami, 0, "Use the -force flag to force a DCM."); | |
287 | } | |
288 | ||
289 | EXEC SQL COMMIT RELEASE; | |
290 | return 0; | |
291 | ||
292 | gen_cleanup: | |
293 | EXEC SQL WHENEVER SQLERROR DO dbmserr(); | |
294 | EXEC SQL UPDATE servers SET inprogress = 0, harderror = MR_INTERNAL, | |
295 | errmsg = 'DBMS Internal Error' WHERE name = UPPER(:name); | |
296 | dbmserr(); | |
297 | } | |
298 | ||
299 | void do_hosts(char *service) | |
300 | { | |
301 | EXEC SQL BEGIN DECLARE SECTION; | |
302 | char server_type[SERVERS_TYPE_SIZE], host[MACHINE_NAME_SIZE], *name; | |
303 | char target[SERVERS_TARGET_FILE_SIZE], script[SERVERS_SCRIPT_SIZE]; | |
304 | const char *errmsg; | |
305 | int status = 0, dfgen, type, mid, inprogress; | |
306 | time_t now; | |
307 | EXEC SQL END DECLARE SECTION; | |
308 | struct save_queue *sq; | |
309 | ||
310 | time(&now); | |
311 | mr_init(); | |
312 | ||
313 | EXEC SQL CONNECT :db IDENTIFIED BY :db; | |
314 | ||
315 | EXEC SQL SELECT dfgen, type, target_file, script, inprogress | |
316 | INTO :dfgen, :server_type, :target, :script, :inprogress | |
317 | FROM servers WHERE name = UPPER(:service); | |
318 | if (!strncmp(strtrim(server_type), "REPLICAT", 8)) | |
319 | type = REPLICATED; | |
320 | else if (!strncmp(server_type, "DISTRIB", 8)) | |
321 | type = DISTRIBUTED; | |
322 | else | |
323 | type = UNIQUE; | |
324 | strtrim(target); | |
325 | strtrim(script); | |
326 | ||
327 | /* Rudimentary locking. Doesn't eliminate the possibility of 2 DCMs | |
328 | * stepping on one another, but makes it harder. | |
329 | */ | |
330 | if (inprogress == 1) | |
331 | { | |
332 | com_err(whoami, 0, "DCM for service `%s' already in progress", name); | |
333 | EXEC SQL COMMIT RELEASE; | |
334 | return; | |
335 | } | |
336 | ||
337 | EXEC SQL DECLARE csr_hst1 CURSOR FOR | |
338 | SELECT m.name, m.mach_id FROM machine m, serverhosts sh | |
339 | WHERE sh.service = UPPER(:service) | |
340 | AND sh.enable = 1 AND sh.hosterror = 0 | |
341 | AND sh.lts < :dfgen AND sh.mach_id = m.mach_id; | |
342 | EXEC SQL OPEN csr_hst1; | |
343 | sq = sq_create(); | |
344 | while (1) | |
345 | { | |
346 | EXEC SQL FETCH csr_hst1 INTO :host, mid; | |
347 | if (sqlca.sqlcode == SQL_NO_MATCH) | |
348 | break; | |
349 | ||
350 | sq_save_data(sq, strdup(strtrim(host))); | |
351 | sq_save_data(sq, (void *)mid); | |
352 | } | |
353 | EXEC SQL CLOSE csr_hst1; | |
354 | ||
355 | EXEC SQL WHENEVER SQLERROR GOTO host_cleanup; | |
356 | while (sq_get_data(sq, &name)) | |
357 | { | |
358 | sq_get_data(sq, &mid); | |
359 | ||
360 | EXEC SQL SELECT inprogress INTO :inprogress FROM serverhosts | |
361 | WHERE service = UPPER(:service) AND mach_id = :mid; | |
362 | /* Check if someone got here before we did. | |
363 | * There's still a race condition here, but it's a small one. */ | |
364 | if (inprogress == 1) | |
365 | { | |
366 | com_err(whoami, 0, "DCM for service `%s' to host `%s' already in progress", service, name); | |
367 | EXEC SQL COMMIT RELEASE; | |
368 | return; | |
369 | } | |
370 | ||
371 | com_err(whoami, 0, "sending %s data to %s", service, name); | |
372 | EXEC SQL UPDATE serverhosts SET inprogress = 1 | |
373 | WHERE service = UPPER(:service) AND mach_id = :mid; | |
374 | EXEC SQL COMMIT; | |
375 | status = dcm_send_file(service, type, name, target); | |
376 | if (status) | |
377 | { | |
378 | errmsg = error_message(status); | |
379 | EXEC SQL UPDATE serverhosts SET hosterrmsg = :errmsg, | |
380 | inprogress = 0, success = 0, ltt = :now | |
381 | WHERE service = UPPER(:service) AND mach_id = :mid; | |
382 | if (!SOFT_FAIL(status)) | |
383 | { | |
384 | EXEC SQL UPDATE serverhosts SET hosterror = :status | |
385 | WHERE service = UPPER(:service) AND mach_id = :mid; | |
386 | critical_alert("DCM", "DCM updating %s:%s: %s", | |
387 | service, name, errmsg); | |
388 | } | |
389 | EXEC SQL COMMIT; | |
390 | ||
391 | if (type == REPLICATED) | |
392 | break; | |
393 | } | |
394 | } | |
395 | sq_destroy(sq); | |
396 | ||
397 | if (status == MR_SUCCESS || type != REPLICATED) | |
398 | { | |
399 | EXEC SQL DECLARE csr_hst2 CURSOR FOR | |
400 | SELECT m.name, m.mach_id FROM machine m, serverhosts sh | |
401 | WHERE sh.service = UPPER(:service) AND sh.inprogress = 1 | |
402 | AND sh.enable = 1 AND sh.hosterror = 0 AND sh.mach_id = m.mach_id; | |
403 | EXEC SQL OPEN csr_hst2; | |
404 | sq = sq_create(); | |
405 | ||
406 | while (1) | |
407 | { | |
408 | EXEC SQL FETCH csr_hst2 INTO :host, :mid; | |
409 | if (sqlca.sqlcode == SQL_NO_MATCH) | |
410 | break; | |
411 | ||
412 | sq_save_data(sq, strdup(strtrim(host))); | |
413 | sq_save_data(sq, (void *)mid); | |
414 | } | |
415 | EXEC SQL CLOSE csr_hst2; | |
416 | ||
417 | while (sq_get_data(sq, &name)) | |
418 | { | |
419 | sq_get_data(sq, &mid); | |
420 | ||
421 | com_err(whoami, 0, "executing instructions on %s", name); | |
422 | status = dcm_execute(service, name, script); | |
423 | if (status) | |
424 | { | |
425 | errmsg = error_message(status); | |
426 | EXEC SQL UPDATE serverhosts SET hosterrmsg = :errmsg, | |
427 | inprogress = 0, success = 0, ltt = :now | |
428 | WHERE service = UPPER(:service) AND mach_id = :mid; | |
429 | if (!SOFT_FAIL(status)) | |
430 | { | |
431 | EXEC SQL UPDATE serverhosts SET hosterror = :status | |
432 | WHERE service = UPPER(:service) AND mach_id = :mid; | |
433 | critical_alert("DCM", "DCM updating %s:%s: %s", | |
434 | service, name, errmsg); | |
435 | } | |
436 | ||
437 | if (type == REPLICATED) | |
438 | break; | |
439 | } | |
440 | else | |
441 | { | |
442 | EXEC SQL UPDATE serverhosts SET inprogress = 0, ltt = :now, | |
443 | lts = :now, success = 1 WHERE service = UPPER(:service) | |
444 | AND mach_id = :mid; | |
445 | } | |
446 | EXEC SQL COMMIT; | |
447 | } | |
448 | EXEC SQL CLOSE csr_hst2; | |
449 | } | |
450 | ||
451 | if (type == REPLICATED) | |
452 | { | |
453 | /* Clear inprogress flag on any hosts we started but didn't | |
454 | * finish. | |
455 | */ | |
456 | EXEC SQL UPDATE serverhosts SET inprogress = 0 | |
457 | WHERE service = UPPER(:service); | |
458 | } | |
459 | ||
460 | EXEC SQL WHENEVER SQLERROR DO dbmserr(); | |
461 | if (status && !SOFT_FAIL(status) && type == REPLICATED) | |
462 | { | |
463 | EXEC SQL UPDATE servers SET harderror = :status, errmsg = :errmsg | |
464 | WHERE name = UPPER(:service); | |
465 | } | |
466 | ||
467 | EXEC SQL COMMIT RELEASE; | |
468 | return; | |
469 | ||
470 | host_cleanup: | |
471 | EXEC SQL UPDATE serverhosts SET inprogress = 0, success = 0, ltt = :now, | |
472 | hosterror = MR_INTERNAL, hosterrmsg = 'DBMS Internal Error' | |
473 | WHERE service = UPPER(:service) AND mach_id = :mid; | |
474 | if (type == REPLICATED) | |
475 | { | |
476 | EXEC SQL UPDATE servers SET harderror = MR_INTERNAL, | |
477 | errmsg = 'DBMS Internal Error' WHERE name = UPPER(:service); | |
478 | } | |
479 | } | |
480 | ||
481 | int dcm_send_file(char *service, int type, char *host, char *target) | |
482 | { | |
483 | char data[MAXPATHLEN]; | |
484 | int code, conn; | |
485 | ||
486 | conn = mr_connect_internal(host, "moira_update"); | |
487 | if (!conn) | |
488 | { | |
489 | com_err(whoami, errno, "can't connect to %s", host); | |
490 | return MR_CANT_CONNECT; | |
491 | } | |
492 | ||
493 | code = mr_send_krb5_auth(conn, host); | |
494 | if (code) | |
495 | code = mr_send_auth(conn, host); | |
496 | if (code) | |
497 | { | |
498 | com_err(whoami, code, "authenticating to %s", host); | |
499 | goto done; | |
500 | } | |
501 | ||
502 | if (type == DISTRIBUTED) | |
503 | sprintf(data, "%s/%s/%s", DCM_DIR, service, host); | |
504 | else | |
505 | sprintf(data, "%s/%s.out", DCM_DIR, service); | |
506 | code = mr_send_file(conn, data, target, 0); | |
507 | if (code) | |
508 | com_err(whoami, code, "sending data to %s", host); | |
509 | ||
510 | done: | |
511 | mr_send_quit(conn); | |
512 | close(conn); | |
513 | return code; | |
514 | } | |
515 | ||
516 | int dcm_execute(char *service, char *host, char *script) | |
517 | { | |
518 | char inst[MAXPATHLEN]; | |
519 | int code, conn; | |
520 | ||
521 | conn = mr_connect_internal(host, "moira_update"); | |
522 | if (!conn) | |
523 | { | |
524 | com_err(whoami, errno, "can't connect to %s", host); | |
525 | return MR_CANT_CONNECT; | |
526 | } | |
527 | ||
528 | code = mr_send_auth(conn, host); | |
529 | if (code) | |
530 | { | |
531 | com_err(whoami, code, "authenticating to %s", host); | |
532 | goto done; | |
533 | } | |
534 | ||
535 | sprintf(inst, "/tmp/moira-update.XXXXXX"); | |
536 | mktemp(inst); | |
537 | code = mr_send_file(conn, script, inst, 0); | |
538 | if (code) | |
539 | { | |
540 | com_err(whoami, code, "sending instructions to %s", host); | |
541 | goto done; | |
542 | } | |
543 | ||
544 | code = mr_execute(conn, inst); | |
545 | if (code) | |
546 | com_err(whoami, code, "executing instructions on %s", host); | |
547 | ||
548 | done: | |
549 | mr_send_quit(conn); | |
550 | close(conn); | |
551 | return code; | |
552 | } | |
553 | ||
554 | void dbmserr(void) | |
555 | { | |
556 | EXEC SQL BEGIN DECLARE SECTION; | |
557 | char err_msg[256]; | |
558 | EXEC SQL END DECLARE SECTION; | |
559 | int bufsize = 256, msglength = 0; | |
560 | ||
561 | sqlglm(err_msg, &bufsize, &msglength); | |
562 | err_msg[msglength] = '\0'; | |
563 | com_err(whoami, 0, "Encountered SQL error:\n%s", err_msg); | |
564 | com_err(whoami, 0, "exiting"); | |
565 | exit(1); | |
566 | } |