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0fa91a0a | 1 | /* |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * Copyright (C) 1987 by the Massachusetts Institute of Technology | |
c801de4c | 7 | * For copying and distribution information, please see the file |
8 | * <mit-copyright.h>. | |
0fa91a0a | 9 | * |
d548a4e7 | 10 | * MOIRA server process. |
0fa91a0a | 11 | * |
12 | * Most of this is stolen from ../gdb/tsr.c | |
13 | * | |
14 | * You are in a maze of twisty little finite automata, all different. | |
15 | * Let the reader beware. | |
16 | * | |
0fa91a0a | 17 | */ |
18 | ||
d548a4e7 | 19 | static char *rcsid_mr_main_c = "$Header$"; |
0fa91a0a | 20 | |
c801de4c | 21 | #include <mit-copyright.h> |
70d54e43 | 22 | #include <strings.h> |
589993be | 23 | #include <sys/types.h> |
70d54e43 | 24 | #include <sys/errno.h> |
70d54e43 | 25 | #include <sys/signal.h> |
554776b1 | 26 | #include <sys/wait.h> |
589993be | 27 | #include <sys/stat.h> |
d548a4e7 | 28 | #include "mr_server.h" |
40165bd0 | 29 | #include <krb_et.h> |
70d54e43 | 30 | |
0ec57336 | 31 | extern CONNECTION newconn, listencon; |
0fa91a0a | 32 | |
0ec57336 | 33 | extern int nclients; |
34 | extern client **clients, *cur_client; | |
0fa91a0a | 35 | |
0ec57336 | 36 | extern OPERATION listenop; |
37 | extern LIST_OF_OPERATIONS op_list; | |
0fa91a0a | 38 | |
0ec57336 | 39 | extern struct sockaddr_in client_addr; |
40 | extern int client_addrlen; | |
41 | extern TUPLE client_tuple; | |
0fa91a0a | 42 | |
0ec57336 | 43 | extern char *whoami; |
44 | extern char buf1[BUFSIZ]; | |
45 | extern char *takedown; | |
46 | extern int errno; | |
2f4ff9cd | 47 | extern FILE *journal; |
70d54e43 | 48 | |
0ec57336 | 49 | extern char *malloc(); |
f5c72293 | 50 | extern int free(); |
0ec57336 | 51 | extern char *inet_ntoa(); |
d548a4e7 | 52 | extern void mr_com_err(); |
0ec57336 | 53 | extern void do_client(); |
70d54e43 | 54 | |
0ec57336 | 55 | extern int sigshut(); |
56 | void clist_append(); | |
57 | void oplist_append(); | |
589993be | 58 | void reapchild(), godormant(), gowakeup(); |
0fa91a0a | 59 | |
0eb9f52f | 60 | extern time_t now; |
61 | ||
0ec57336 | 62 | /* |
d548a4e7 | 63 | * Main MOIRA server loop. |
0ec57336 | 64 | * |
65 | * Initialize the world, then start accepting connections and | |
66 | * making progress on current connections. | |
67 | */ | |
0fa91a0a | 68 | |
0ec57336 | 69 | /*ARGSUSED*/ |
70 | int | |
0fa91a0a | 71 | main(argc, argv) |
70d54e43 | 72 | int argc; |
73 | char **argv; | |
0fa91a0a | 74 | { |
cfbc1e92 | 75 | int status, i; |
0eb9f52f | 76 | time_t tardy; |
cfbc1e92 | 77 | char *port; |
78 | extern char *database; | |
589993be | 79 | struct stat stbuf; |
0ec57336 | 80 | |
81 | whoami = argv[0]; | |
82 | /* | |
83 | * Error handler init. | |
84 | */ | |
40165bd0 | 85 | initialize_sms_error_table(); |
86 | initialize_krb_error_table(); | |
adae415b | 87 | initialize_gdss_error_table(); |
d548a4e7 | 88 | set_com_err_hook(mr_com_err); |
b4182127 | 89 | setlinebuf(stderr); |
90 | ||
cfbc1e92 | 91 | database = "moira"; |
92 | port = index(MOIRA_SERVER, ':') + 1; | |
93 | ||
94 | for (i = 1; i < argc; i++) { | |
95 | if (!strcmp(argv[i], "-db") && i+1 < argc) { | |
96 | database = argv[i+1]; | |
97 | i++; | |
98 | } else if (!strcmp(argv[i], "-p") && i+1 < argc) { | |
99 | port = argv[i+1]; | |
100 | i++; | |
101 | } else { | |
102 | com_err(whoami, 0, "Usage: moirad [-db database][-p port]"); | |
0ec57336 | 103 | exit(1); |
cfbc1e92 | 104 | } |
105 | } | |
f5c72293 | 106 | |
107 | /* Profiling implies that getting rid of one level of call | |
108 | * indirection here wins us maybe 1% on the VAX. | |
109 | */ | |
110 | gdb_amv = malloc; | |
111 | gdb_fmv = free; | |
0ec57336 | 112 | |
113 | /* | |
114 | * GDB initialization. | |
115 | */ | |
5dbd09a0 | 116 | if(gdb_init() != 0) { |
117 | com_err(whoami, 0, "GDB initialization failed."); | |
118 | exit(1); | |
119 | } | |
7f024a70 | 120 | gdb_debug(0); /* this can be patched, if necessary, to enable */ |
121 | /* GDB level debugging .. */ | |
4a06eb54 | 122 | krb_realm = malloc(REALM_SZ); |
42b1d0ae | 123 | krb_get_lrealm(krb_realm, 1); |
7f024a70 | 124 | |
f6cc38de | 125 | /* |
083a6e94 | 126 | * Database initialization. Only init if database should be open. |
f6cc38de | 127 | */ |
128 | ||
d548a4e7 | 129 | if (stat(MOIRA_MOTD_FILE, &stbuf) != 0) { |
130 | if ((status = mr_open_database()) != 0) { | |
2f4ff9cd | 131 | com_err(whoami, status, " when trying to open database."); |
f6cc38de | 132 | exit(1); |
083a6e94 | 133 | } |
134 | sanity_check_database(); | |
135 | } else { | |
136 | dormant = ASLEEP; | |
137 | com_err(whoami, 0, "sleeping, not opening database"); | |
f6cc38de | 138 | } |
139 | ||
2f4ff9cd | 140 | sanity_check_queries(); |
2f4ff9cd | 141 | |
0ec57336 | 142 | /* |
143 | * Set up client array handler. | |
144 | */ | |
0fa91a0a | 145 | nclients = 0; |
146 | clients = (client **) malloc(0); | |
70d54e43 | 147 | |
d548a4e7 | 148 | mr_setup_signals(); |
0ec57336 | 149 | |
2f4ff9cd | 150 | journal = fopen(JOURNAL, "a"); |
151 | if (journal == NULL) { | |
152 | com_err(whoami, errno, " while opening journal file"); | |
153 | exit(1); | |
154 | } | |
155 | ||
0ec57336 | 156 | /* |
157 | * Establish template connection. | |
158 | */ | |
cfbc1e92 | 159 | if ((status = do_listen(port)) != 0) { |
0ec57336 | 160 | com_err(whoami, status, |
2f4ff9cd | 161 | " while trying to create listening connection"); |
0ec57336 | 162 | exit(1); |
163 | } | |
0fa91a0a | 164 | |
0fa91a0a | 165 | op_list = create_list_of_operations(1, listenop); |
0fa91a0a | 166 | |
b4182127 | 167 | com_err(whoami, 0, "started (pid %d)", getpid()); |
d548a4e7 | 168 | com_err(whoami, 0, rcsid_mr_main_c); |
083a6e94 | 169 | if (dormant != ASLEEP) |
d548a4e7 | 170 | send_zgram("MOIRA", "server started"); |
083a6e94 | 171 | else |
d548a4e7 | 172 | send_zgram("MOIRA", "server started, but database closed"); |
0ec57336 | 173 | |
174 | /* | |
175 | * Run until shut down. | |
176 | */ | |
70d54e43 | 177 | while(!takedown) { |
0ec57336 | 178 | register int i; |
179 | /* | |
180 | * Block until something happens. | |
181 | */ | |
5dbd09a0 | 182 | #ifdef notdef |
183 | com_err(whoami, 0, "tick"); | |
184 | #endif notdef | |
589993be | 185 | if (dormant == SLEEPY) { |
d548a4e7 | 186 | mr_close_database(); |
589993be | 187 | com_err(whoami, 0, "database closed"); |
d548a4e7 | 188 | mr_setup_signals(); |
189 | send_zgram("MOIRA", "database closed"); | |
589993be | 190 | dormant = ASLEEP; |
191 | } else if (dormant == GROGGY) { | |
d548a4e7 | 192 | mr_open_database(); |
589993be | 193 | com_err(whoami, 0, "database open"); |
d548a4e7 | 194 | mr_setup_signals(); |
195 | send_zgram("MOIRA", "database open again"); | |
589993be | 196 | dormant = AWAKE; |
197 | } | |
198 | ||
5dbd09a0 | 199 | errno = 0; |
200 | status = op_select_any(op_list, 0, | |
201 | (fd_set *)NULL, (fd_set *)NULL, | |
202 | (fd_set *)NULL, (struct timeval *)NULL); | |
203 | ||
204 | if (status == -1) { | |
42b1d0ae | 205 | if (errno != EINTR) |
206 | com_err(whoami, errno, " error from op_select"); | |
2e182bc3 | 207 | if (!inc_running || now - inc_started > INC_TIMEOUT) |
208 | next_incremental(); | |
5dbd09a0 | 209 | continue; |
210 | } else if (status != -2) { | |
2f4ff9cd | 211 | com_err(whoami, 0, " wrong return from op_select_any"); |
5dbd09a0 | 212 | continue; |
213 | } | |
70d54e43 | 214 | if (takedown) break; |
0eb9f52f | 215 | time(&now); |
2e182bc3 | 216 | if (!inc_running || now - inc_started > INC_TIMEOUT) |
217 | next_incremental(); | |
70d54e43 | 218 | #ifdef notdef |
219 | fprintf(stderr, " tick\n"); | |
220 | #endif notdef | |
b4182127 | 221 | /* |
222 | * Handle any new connections; this comes first so | |
223 | * errno isn't tromped on. | |
224 | */ | |
225 | if (OP_DONE(listenop)) { | |
226 | if (OP_STATUS(listenop) == OP_CANCELLED) { | |
227 | if (errno == EWOULDBLOCK) { | |
228 | do_reset_listen(); | |
229 | } else { | |
14e2d5ce | 230 | static int count = 0; |
b4182127 | 231 | com_err(whoami, errno, |
14e2d5ce | 232 | " error (%d) on listen", count); |
233 | if (count++ > 10) | |
234 | exit(1); | |
b4182127 | 235 | } |
236 | } else if ((status = new_connection()) != 0) { | |
237 | com_err(whoami, errno, | |
2f4ff9cd | 238 | " Error on listening operation."); |
b4182127 | 239 | /* |
240 | * Sleep here to prevent hosing? | |
241 | */ | |
242 | } | |
589993be | 243 | /* if the new connection is our only connection, |
244 | * and the server is supposed to be down, then go | |
245 | * down now. | |
246 | */ | |
247 | if ((dormant == AWAKE) && (nclients == 1) && | |
d548a4e7 | 248 | (stat(MOIRA_MOTD_FILE, &stbuf) == 0)) { |
589993be | 249 | com_err(whoami, 0, "motd file exists, slumbertime"); |
250 | dormant = SLEEPY; | |
251 | } | |
252 | /* on new connection, if we are no longer supposed | |
253 | * to be down, then wake up. | |
254 | */ | |
255 | if ((dormant == ASLEEP) && | |
d548a4e7 | 256 | (stat(MOIRA_MOTD_FILE, &stbuf) == -1) && |
589993be | 257 | (errno == ENOENT)) { |
258 | com_err(whoami, 0, "motd file no longer exists, waking up"); | |
259 | dormant = GROGGY; | |
260 | } | |
261 | ||
b4182127 | 262 | } |
0ec57336 | 263 | /* |
264 | * Handle any existing connections. | |
265 | */ | |
0eb9f52f | 266 | tardy = now - 30*60; |
267 | ||
0fa91a0a | 268 | for (i=0; i<nclients; i++) { |
0eb9f52f | 269 | cur_client = clients[i]; |
0fa91a0a | 270 | if (OP_DONE(clients[i]->pending_op)) { |
0eb9f52f | 271 | cur_client->last_time_used = now; |
70d54e43 | 272 | do_client(cur_client); |
0eb9f52f | 273 | } else if (clients[i]->last_time_used < tardy) { |
274 | com_err(whoami, 0, "Shutting down connection due to inactivity"); | |
275 | shutdown(cur_client->con->in.fd, 0); | |
0fa91a0a | 276 | } |
0eb9f52f | 277 | cur_client = NULL; |
278 | if (takedown) break; | |
0fa91a0a | 279 | } |
0fa91a0a | 280 | } |
b4182127 | 281 | com_err(whoami, 0, "%s", takedown); |
d548a4e7 | 282 | mr_close_database(); |
283 | send_zgram("MOIRA", takedown); | |
0ec57336 | 284 | return 0; |
70d54e43 | 285 | } |
286 | ||
0ec57336 | 287 | /* |
288 | * Set up the template connection and queue the first accept. | |
289 | */ | |
290 | ||
291 | int | |
cfbc1e92 | 292 | do_listen(port) |
293 | char *port; | |
70d54e43 | 294 | { |
cfbc1e92 | 295 | listencon = create_listening_connection(port); |
0ec57336 | 296 | |
297 | if (listencon == NULL) | |
298 | return errno; | |
299 | ||
300 | listenop = create_operation(); | |
301 | client_addrlen = sizeof(client_addr); | |
302 | ||
303 | start_accepting_client(listencon, listenop, &newconn, | |
304 | (char *)&client_addr, | |
305 | &client_addrlen, &client_tuple); | |
306 | return 0; | |
0fa91a0a | 307 | } |
308 | ||
b4182127 | 309 | |
310 | do_reset_listen() | |
311 | { | |
312 | client_addrlen = sizeof(client_addr); | |
313 | start_accepting_client(listencon, listenop, &newconn, | |
314 | (char *)&client_addr, | |
315 | &client_addrlen, &client_tuple); | |
316 | } | |
317 | ||
0ec57336 | 318 | /* |
319 | * This routine is called when a new connection comes in. | |
320 | * | |
321 | * It sets up a new client and adds it to the list of currently active clients. | |
322 | */ | |
323 | int | |
5dbd09a0 | 324 | new_connection() |
0fa91a0a | 325 | { |
7f024a70 | 326 | register client *cp; |
70d54e43 | 327 | static counter = 0; |
0fa91a0a | 328 | |
0fa91a0a | 329 | /* |
330 | * Make sure there's been no error | |
331 | */ | |
c27b3454 | 332 | if(OP_STATUS(listenop) != OP_COMPLETE) { |
0ec57336 | 333 | return errno; |
c27b3454 | 334 | } |
335 | ||
336 | if (newconn == NULL) { | |
d548a4e7 | 337 | return MR_NOT_CONNECTED; |
0fa91a0a | 338 | } |
339 | ||
0fa91a0a | 340 | /* |
341 | * Set up the new connection and reply to the client | |
342 | */ | |
7f024a70 | 343 | cp = (client *)malloc(sizeof *cp); |
23e476e8 | 344 | bzero(cp, sizeof(*cp)); |
0fa91a0a | 345 | cp->action = CL_ACCEPT; |
346 | cp->con = newconn; | |
70d54e43 | 347 | cp->id = counter++; |
0ec57336 | 348 | cp->args = NULL; |
42b1d0ae | 349 | cp->clname[0] = NULL; |
d548a4e7 | 350 | cp->reply.mr_argv = NULL; |
4a06eb54 | 351 | cp->first = NULL; |
352 | cp->last = NULL; | |
0eb9f52f | 353 | cp->last_time_used = now; |
0fa91a0a | 354 | newconn = NULL; |
355 | ||
356 | cp->pending_op = create_operation(); | |
357 | reset_operation(cp->pending_op); | |
358 | oplist_append(&op_list, cp->pending_op); | |
70d54e43 | 359 | cur_client = cp; |
360 | ||
0ec57336 | 361 | /* |
362 | * Add a new client to the array.. | |
363 | */ | |
364 | clist_append(cp); | |
365 | ||
366 | /* | |
367 | * Let him know we heard him. | |
368 | */ | |
0fa91a0a | 369 | start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, |
370 | "", ""); | |
0ec57336 | 371 | |
372 | cp->haddr = client_addr; | |
373 | ||
374 | /* | |
375 | * Log new connection. | |
376 | */ | |
377 | ||
b4182127 | 378 | com_err(whoami, 0, "New connection from %s port %d (now %d client%s)", |
379 | inet_ntoa(cp->haddr.sin_addr), | |
380 | (int)ntohs(cp->haddr.sin_port), | |
381 | nclients, | |
382 | nclients!=1?"s":""); | |
0fa91a0a | 383 | |
384 | /* | |
0ec57336 | 385 | * Get ready to accept the next connection. |
0fa91a0a | 386 | */ |
387 | reset_operation(listenop); | |
0ec57336 | 388 | client_addrlen = sizeof(client_addr); |
0fa91a0a | 389 | |
390 | start_accepting_client(listencon, listenop, &newconn, | |
0ec57336 | 391 | (char *)&client_addr, |
392 | &client_addrlen, &client_tuple); | |
393 | return 0; | |
0fa91a0a | 394 | } |
395 | ||
0fa91a0a | 396 | /* |
397 | * Add a new client to the known clients. | |
398 | */ | |
0ec57336 | 399 | void |
0fa91a0a | 400 | clist_append(cp) |
401 | client *cp; | |
402 | { | |
403 | client **clients_n; | |
404 | ||
405 | nclients++; | |
0ec57336 | 406 | clients_n = (client **)malloc |
407 | ((unsigned)(nclients * sizeof(client *))); | |
0fa91a0a | 408 | bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp)); |
409 | clients_n[nclients-1] = cp; | |
410 | free((char *)clients); | |
411 | clients = clients_n; | |
412 | clients_n = NULL; | |
413 | } | |
414 | ||
70d54e43 | 415 | |
0ec57336 | 416 | void |
70d54e43 | 417 | clist_delete(cp) |
418 | client *cp; | |
419 | { | |
70d54e43 | 420 | client **clients_n, **scpp, **dcpp; /* source and dest client */ |
421 | /* ptr ptr */ | |
422 | ||
70d54e43 | 423 | int found_it = 0; |
424 | ||
0ec57336 | 425 | clients_n = (client **)malloc |
426 | ((unsigned)((nclients - 1)* sizeof(client *))); | |
70d54e43 | 427 | for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) { |
428 | if (*scpp != cp) { | |
429 | *dcpp++ = *scpp++; | |
430 | } else { | |
431 | scpp++; | |
432 | if (found_it) abort(); | |
433 | found_it = 1; | |
434 | } | |
435 | } | |
436 | --nclients; | |
437 | free((char *)clients); | |
438 | clients = clients_n; | |
439 | clients_n = NULL; | |
c27b3454 | 440 | oplist_delete(op_list, cp->pending_op); |
70d54e43 | 441 | reset_operation(cp->pending_op); |
442 | delete_operation(cp->pending_op); | |
7f024a70 | 443 | sever_connection(cp->con); |
0ec57336 | 444 | free((char *)cp); |
70d54e43 | 445 | } |
0ec57336 | 446 | |
0fa91a0a | 447 | /* |
0ec57336 | 448 | * Add a new operation to a list of operations. |
449 | * | |
450 | * This should be rewritten to use realloc instead, since in most | |
451 | * cases it won't have to copy the array. | |
0fa91a0a | 452 | */ |
453 | ||
0ec57336 | 454 | void |
0fa91a0a | 455 | oplist_append(oplp, op) |
456 | LIST_OF_OPERATIONS *oplp; | |
457 | OPERATION op; | |
458 | { | |
459 | int count = (*oplp)->count+1; | |
460 | LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS) | |
461 | db_alloc(size_of_list_of_operations(count)); | |
462 | bcopy((char *)(*oplp), (char *)newlist, | |
463 | size_of_list_of_operations((*oplp)->count)); | |
0fa91a0a | 464 | newlist->count++; |
465 | newlist->op[count-1] = op; | |
467f5982 | 466 | db_free((char *)(*oplp), size_of_list_of_operations(count-1)); |
0fa91a0a | 467 | (*oplp) = newlist; |
468 | } | |
469 | ||
c27b3454 | 470 | |
471 | oplist_delete(oplp, op) | |
472 | LIST_OF_OPERATIONS oplp; | |
473 | register OPERATION op; | |
474 | { | |
475 | register OPERATION *s; | |
476 | register int c; | |
477 | ||
478 | for (s = oplp->op, c=oplp->count; c; --c, ++s) { | |
479 | if (*s == op) { | |
480 | while (c > 0) { | |
481 | *s = *(s+1); | |
482 | ++s; | |
483 | --c; | |
484 | } | |
485 | oplp->count--; | |
486 | return; | |
487 | } | |
488 | } | |
489 | abort(); | |
490 | } | |
554776b1 | 491 | |
492 | ||
493 | void reapchild() | |
494 | { | |
495 | union wait status; | |
496 | int pid; | |
497 | ||
498 | while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0) { | |
2e182bc3 | 499 | if (pid == inc_pid) |
500 | inc_running = 0; | |
42b1d0ae | 501 | if (!takedown && (status.w_termsig != 0 || status.w_retcode != 0)) |
589993be | 502 | com_err(whoami, 0, "%d: child exits with signal %d status %d", |
554776b1 | 503 | pid, status.w_termsig, status.w_retcode); |
504 | } | |
505 | } | |
589993be | 506 | |
507 | ||
508 | void godormant() | |
509 | { | |
510 | switch (dormant) { | |
511 | case AWAKE: | |
512 | case GROGGY: | |
513 | com_err(whoami, 0, "requested to go dormant"); | |
514 | break; | |
515 | case ASLEEP: | |
516 | com_err(whoami, 0, "already asleep"); | |
517 | break; | |
518 | case SLEEPY: | |
519 | break; | |
520 | } | |
521 | dormant = SLEEPY; | |
522 | } | |
523 | ||
524 | ||
525 | void gowakeup() | |
526 | { | |
527 | switch (dormant) { | |
528 | case ASLEEP: | |
529 | case SLEEPY: | |
530 | com_err(whoami, 0, "Good morning"); | |
531 | break; | |
532 | case AWAKE: | |
533 | com_err(whoami, 0, "already awake"); | |
534 | break; | |
535 | case GROGGY: | |
536 | break; | |
537 | } | |
538 | dormant = GROGGY; | |
539 | } | |
083a6e94 | 540 | |
541 | ||
d548a4e7 | 542 | mr_setup_signals() |
083a6e94 | 543 | { |
544 | /* There should probably be a few more of these. */ | |
545 | ||
546 | if ((((int)signal (SIGTERM, sigshut)) < 0) || | |
547 | (((int)signal (SIGCHLD, reapchild)) < 0) || | |
548 | (((int)signal (SIGUSR1, godormant)) < 0) || | |
549 | (((int)signal (SIGUSR2, gowakeup)) < 0) || | |
550 | (((int)signal (SIGHUP, sigshut)) < 0)) { | |
551 | com_err(whoami, errno, " Unable to establish signal handlers."); | |
552 | exit(1); | |
553 | } | |
554 | } |