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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 | * |
10 | * SMS server process. | |
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 | ||
0fa91a0a | 19 | static char *rcsid_sms_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> |
0fa91a0a | 28 | #include "sms_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(); |
52 | extern void sms_com_err(); | |
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 | /* |
63 | * Main SMS server loop. | |
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 | { |
0ec57336 | 75 | int status; |
0eb9f52f | 76 | time_t tardy; |
589993be | 77 | struct stat stbuf; |
0ec57336 | 78 | |
79 | whoami = argv[0]; | |
80 | /* | |
81 | * Error handler init. | |
82 | */ | |
40165bd0 | 83 | initialize_sms_error_table(); |
84 | initialize_krb_error_table(); | |
0ec57336 | 85 | set_com_err_hook(sms_com_err); |
b4182127 | 86 | setlinebuf(stderr); |
87 | ||
0ec57336 | 88 | if (argc != 1) { |
89 | com_err(whoami, 0, "Usage: smsd"); | |
90 | exit(1); | |
91 | } | |
f5c72293 | 92 | |
93 | /* Profiling implies that getting rid of one level of call | |
94 | * indirection here wins us maybe 1% on the VAX. | |
95 | */ | |
96 | gdb_amv = malloc; | |
97 | gdb_fmv = free; | |
0ec57336 | 98 | |
99 | /* | |
100 | * GDB initialization. | |
101 | */ | |
5dbd09a0 | 102 | if(gdb_init() != 0) { |
103 | com_err(whoami, 0, "GDB initialization failed."); | |
104 | exit(1); | |
105 | } | |
7f024a70 | 106 | gdb_debug(0); /* this can be patched, if necessary, to enable */ |
107 | /* GDB level debugging .. */ | |
4a06eb54 | 108 | krb_realm = malloc(REALM_SZ); |
42b1d0ae | 109 | krb_get_lrealm(krb_realm, 1); |
7f024a70 | 110 | |
f6cc38de | 111 | /* |
083a6e94 | 112 | * Database initialization. Only init if database should be open. |
f6cc38de | 113 | */ |
114 | ||
083a6e94 | 115 | if (stat(SMS_MOTD_FILE, &stbuf) != 0) { |
116 | if ((status = sms_open_database()) != 0) { | |
2f4ff9cd | 117 | com_err(whoami, status, " when trying to open database."); |
f6cc38de | 118 | exit(1); |
083a6e94 | 119 | } |
120 | sanity_check_database(); | |
121 | } else { | |
122 | dormant = ASLEEP; | |
123 | com_err(whoami, 0, "sleeping, not opening database"); | |
f6cc38de | 124 | } |
125 | ||
2f4ff9cd | 126 | sanity_check_queries(); |
2f4ff9cd | 127 | |
0ec57336 | 128 | /* |
129 | * Set up client array handler. | |
130 | */ | |
0fa91a0a | 131 | nclients = 0; |
132 | clients = (client **) malloc(0); | |
70d54e43 | 133 | |
083a6e94 | 134 | sms_setup_signals(); |
0ec57336 | 135 | |
2f4ff9cd | 136 | journal = fopen(JOURNAL, "a"); |
137 | if (journal == NULL) { | |
138 | com_err(whoami, errno, " while opening journal file"); | |
139 | exit(1); | |
140 | } | |
141 | ||
0ec57336 | 142 | /* |
143 | * Establish template connection. | |
144 | */ | |
145 | if ((status = do_listen()) != 0) { | |
146 | com_err(whoami, status, | |
2f4ff9cd | 147 | " while trying to create listening connection"); |
0ec57336 | 148 | exit(1); |
149 | } | |
0fa91a0a | 150 | |
0fa91a0a | 151 | op_list = create_list_of_operations(1, listenop); |
0fa91a0a | 152 | |
b4182127 | 153 | com_err(whoami, 0, "started (pid %d)", getpid()); |
0ec57336 | 154 | com_err(whoami, 0, rcsid_sms_main_c); |
083a6e94 | 155 | if (dormant != ASLEEP) |
156 | send_zgram("SMS", "server started"); | |
157 | else | |
158 | send_zgram("SMS", "server started, but database closed"); | |
0ec57336 | 159 | |
160 | /* | |
161 | * Run until shut down. | |
162 | */ | |
70d54e43 | 163 | while(!takedown) { |
0ec57336 | 164 | register int i; |
165 | /* | |
166 | * Block until something happens. | |
167 | */ | |
5dbd09a0 | 168 | #ifdef notdef |
169 | com_err(whoami, 0, "tick"); | |
170 | #endif notdef | |
589993be | 171 | if (dormant == SLEEPY) { |
172 | sms_close_database(); | |
173 | com_err(whoami, 0, "database closed"); | |
083a6e94 | 174 | sms_setup_signals(); |
589993be | 175 | send_zgram("SMS", "database closed"); |
176 | dormant = ASLEEP; | |
177 | } else if (dormant == GROGGY) { | |
178 | sms_open_database(); | |
179 | com_err(whoami, 0, "database open"); | |
083a6e94 | 180 | sms_setup_signals(); |
589993be | 181 | send_zgram("SMS", "database open again"); |
182 | dormant = AWAKE; | |
183 | } | |
184 | ||
5dbd09a0 | 185 | errno = 0; |
186 | status = op_select_any(op_list, 0, | |
187 | (fd_set *)NULL, (fd_set *)NULL, | |
188 | (fd_set *)NULL, (struct timeval *)NULL); | |
189 | ||
190 | if (status == -1) { | |
42b1d0ae | 191 | if (errno != EINTR) |
192 | com_err(whoami, errno, " error from op_select"); | |
5dbd09a0 | 193 | continue; |
194 | } else if (status != -2) { | |
2f4ff9cd | 195 | com_err(whoami, 0, " wrong return from op_select_any"); |
5dbd09a0 | 196 | continue; |
197 | } | |
70d54e43 | 198 | if (takedown) break; |
0eb9f52f | 199 | time(&now); |
70d54e43 | 200 | #ifdef notdef |
201 | fprintf(stderr, " tick\n"); | |
202 | #endif notdef | |
b4182127 | 203 | /* |
204 | * Handle any new connections; this comes first so | |
205 | * errno isn't tromped on. | |
206 | */ | |
207 | if (OP_DONE(listenop)) { | |
208 | if (OP_STATUS(listenop) == OP_CANCELLED) { | |
209 | if (errno == EWOULDBLOCK) { | |
210 | do_reset_listen(); | |
211 | } else { | |
212 | com_err(whoami, errno, | |
2f4ff9cd | 213 | " error on listen"); |
b4182127 | 214 | exit(1); |
215 | } | |
216 | } else if ((status = new_connection()) != 0) { | |
217 | com_err(whoami, errno, | |
2f4ff9cd | 218 | " Error on listening operation."); |
b4182127 | 219 | /* |
220 | * Sleep here to prevent hosing? | |
221 | */ | |
222 | } | |
589993be | 223 | /* if the new connection is our only connection, |
224 | * and the server is supposed to be down, then go | |
225 | * down now. | |
226 | */ | |
227 | if ((dormant == AWAKE) && (nclients == 1) && | |
228 | (stat(SMS_MOTD_FILE, &stbuf) == 0)) { | |
229 | com_err(whoami, 0, "motd file exists, slumbertime"); | |
230 | dormant = SLEEPY; | |
231 | } | |
232 | /* on new connection, if we are no longer supposed | |
233 | * to be down, then wake up. | |
234 | */ | |
235 | if ((dormant == ASLEEP) && | |
236 | (stat(SMS_MOTD_FILE, &stbuf) == -1) && | |
237 | (errno == ENOENT)) { | |
238 | com_err(whoami, 0, "motd file no longer exists, waking up"); | |
239 | dormant = GROGGY; | |
240 | } | |
241 | ||
b4182127 | 242 | } |
0ec57336 | 243 | /* |
244 | * Handle any existing connections. | |
245 | */ | |
0eb9f52f | 246 | tardy = now - 30*60; |
247 | ||
0fa91a0a | 248 | for (i=0; i<nclients; i++) { |
0eb9f52f | 249 | cur_client = clients[i]; |
0fa91a0a | 250 | if (OP_DONE(clients[i]->pending_op)) { |
0eb9f52f | 251 | cur_client->last_time_used = now; |
70d54e43 | 252 | do_client(cur_client); |
0eb9f52f | 253 | } else if (clients[i]->last_time_used < tardy) { |
254 | com_err(whoami, 0, "Shutting down connection due to inactivity"); | |
255 | shutdown(cur_client->con->in.fd, 0); | |
0fa91a0a | 256 | } |
0eb9f52f | 257 | cur_client = NULL; |
258 | if (takedown) break; | |
0fa91a0a | 259 | } |
0fa91a0a | 260 | } |
b4182127 | 261 | com_err(whoami, 0, "%s", takedown); |
f6cc38de | 262 | sms_close_database(); |
49700f8b | 263 | send_zgram("SMS", takedown); |
0ec57336 | 264 | return 0; |
70d54e43 | 265 | } |
266 | ||
0ec57336 | 267 | /* |
268 | * Set up the template connection and queue the first accept. | |
269 | */ | |
270 | ||
271 | int | |
272 | do_listen() | |
70d54e43 | 273 | { |
0ec57336 | 274 | char *service = index(SMS_GDB_SERV, ':') + 1; |
275 | ||
276 | listencon = create_listening_connection(service); | |
277 | ||
278 | if (listencon == NULL) | |
279 | return errno; | |
280 | ||
281 | listenop = create_operation(); | |
282 | client_addrlen = sizeof(client_addr); | |
283 | ||
284 | start_accepting_client(listencon, listenop, &newconn, | |
285 | (char *)&client_addr, | |
286 | &client_addrlen, &client_tuple); | |
287 | return 0; | |
0fa91a0a | 288 | } |
289 | ||
b4182127 | 290 | |
291 | do_reset_listen() | |
292 | { | |
293 | client_addrlen = sizeof(client_addr); | |
294 | start_accepting_client(listencon, listenop, &newconn, | |
295 | (char *)&client_addr, | |
296 | &client_addrlen, &client_tuple); | |
297 | } | |
298 | ||
0ec57336 | 299 | /* |
300 | * This routine is called when a new connection comes in. | |
301 | * | |
302 | * It sets up a new client and adds it to the list of currently active clients. | |
303 | */ | |
304 | int | |
5dbd09a0 | 305 | new_connection() |
0fa91a0a | 306 | { |
7f024a70 | 307 | register client *cp; |
70d54e43 | 308 | static counter = 0; |
0fa91a0a | 309 | |
0fa91a0a | 310 | /* |
311 | * Make sure there's been no error | |
312 | */ | |
c27b3454 | 313 | if(OP_STATUS(listenop) != OP_COMPLETE) { |
0ec57336 | 314 | return errno; |
c27b3454 | 315 | } |
316 | ||
317 | if (newconn == NULL) { | |
318 | return SMS_NOT_CONNECTED; | |
0fa91a0a | 319 | } |
320 | ||
0fa91a0a | 321 | /* |
322 | * Set up the new connection and reply to the client | |
323 | */ | |
7f024a70 | 324 | cp = (client *)malloc(sizeof *cp); |
23e476e8 | 325 | bzero(cp, sizeof(*cp)); |
0fa91a0a | 326 | cp->action = CL_ACCEPT; |
327 | cp->con = newconn; | |
70d54e43 | 328 | cp->id = counter++; |
0ec57336 | 329 | cp->args = NULL; |
42b1d0ae | 330 | cp->clname[0] = NULL; |
0ec57336 | 331 | cp->reply.sms_argv = NULL; |
4a06eb54 | 332 | cp->first = NULL; |
333 | cp->last = NULL; | |
0eb9f52f | 334 | cp->last_time_used = now; |
0fa91a0a | 335 | newconn = NULL; |
336 | ||
337 | cp->pending_op = create_operation(); | |
338 | reset_operation(cp->pending_op); | |
339 | oplist_append(&op_list, cp->pending_op); | |
70d54e43 | 340 | cur_client = cp; |
341 | ||
0ec57336 | 342 | /* |
343 | * Add a new client to the array.. | |
344 | */ | |
345 | clist_append(cp); | |
346 | ||
347 | /* | |
348 | * Let him know we heard him. | |
349 | */ | |
0fa91a0a | 350 | start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, |
351 | "", ""); | |
0ec57336 | 352 | |
353 | cp->haddr = client_addr; | |
354 | ||
355 | /* | |
356 | * Log new connection. | |
357 | */ | |
358 | ||
b4182127 | 359 | com_err(whoami, 0, "New connection from %s port %d (now %d client%s)", |
360 | inet_ntoa(cp->haddr.sin_addr), | |
361 | (int)ntohs(cp->haddr.sin_port), | |
362 | nclients, | |
363 | nclients!=1?"s":""); | |
0fa91a0a | 364 | |
365 | /* | |
0ec57336 | 366 | * Get ready to accept the next connection. |
0fa91a0a | 367 | */ |
368 | reset_operation(listenop); | |
0ec57336 | 369 | client_addrlen = sizeof(client_addr); |
0fa91a0a | 370 | |
371 | start_accepting_client(listencon, listenop, &newconn, | |
0ec57336 | 372 | (char *)&client_addr, |
373 | &client_addrlen, &client_tuple); | |
374 | return 0; | |
0fa91a0a | 375 | } |
376 | ||
0fa91a0a | 377 | /* |
378 | * Add a new client to the known clients. | |
379 | */ | |
0ec57336 | 380 | void |
0fa91a0a | 381 | clist_append(cp) |
382 | client *cp; | |
383 | { | |
384 | client **clients_n; | |
385 | ||
386 | nclients++; | |
0ec57336 | 387 | clients_n = (client **)malloc |
388 | ((unsigned)(nclients * sizeof(client *))); | |
0fa91a0a | 389 | bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp)); |
390 | clients_n[nclients-1] = cp; | |
391 | free((char *)clients); | |
392 | clients = clients_n; | |
393 | clients_n = NULL; | |
394 | } | |
395 | ||
70d54e43 | 396 | |
0ec57336 | 397 | void |
70d54e43 | 398 | clist_delete(cp) |
399 | client *cp; | |
400 | { | |
70d54e43 | 401 | client **clients_n, **scpp, **dcpp; /* source and dest client */ |
402 | /* ptr ptr */ | |
403 | ||
70d54e43 | 404 | int found_it = 0; |
405 | ||
0ec57336 | 406 | clients_n = (client **)malloc |
407 | ((unsigned)((nclients - 1)* sizeof(client *))); | |
70d54e43 | 408 | for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) { |
409 | if (*scpp != cp) { | |
410 | *dcpp++ = *scpp++; | |
411 | } else { | |
412 | scpp++; | |
413 | if (found_it) abort(); | |
414 | found_it = 1; | |
415 | } | |
416 | } | |
417 | --nclients; | |
418 | free((char *)clients); | |
419 | clients = clients_n; | |
420 | clients_n = NULL; | |
c27b3454 | 421 | oplist_delete(op_list, cp->pending_op); |
70d54e43 | 422 | reset_operation(cp->pending_op); |
423 | delete_operation(cp->pending_op); | |
7f024a70 | 424 | sever_connection(cp->con); |
0ec57336 | 425 | free((char *)cp); |
70d54e43 | 426 | } |
0ec57336 | 427 | |
0fa91a0a | 428 | /* |
0ec57336 | 429 | * Add a new operation to a list of operations. |
430 | * | |
431 | * This should be rewritten to use realloc instead, since in most | |
432 | * cases it won't have to copy the array. | |
0fa91a0a | 433 | */ |
434 | ||
0ec57336 | 435 | void |
0fa91a0a | 436 | oplist_append(oplp, op) |
437 | LIST_OF_OPERATIONS *oplp; | |
438 | OPERATION op; | |
439 | { | |
440 | int count = (*oplp)->count+1; | |
441 | LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS) | |
442 | db_alloc(size_of_list_of_operations(count)); | |
443 | bcopy((char *)(*oplp), (char *)newlist, | |
444 | size_of_list_of_operations((*oplp)->count)); | |
0fa91a0a | 445 | newlist->count++; |
446 | newlist->op[count-1] = op; | |
467f5982 | 447 | db_free((char *)(*oplp), size_of_list_of_operations(count-1)); |
0fa91a0a | 448 | (*oplp) = newlist; |
449 | } | |
450 | ||
c27b3454 | 451 | |
452 | oplist_delete(oplp, op) | |
453 | LIST_OF_OPERATIONS oplp; | |
454 | register OPERATION op; | |
455 | { | |
456 | register OPERATION *s; | |
457 | register int c; | |
458 | ||
459 | for (s = oplp->op, c=oplp->count; c; --c, ++s) { | |
460 | if (*s == op) { | |
461 | while (c > 0) { | |
462 | *s = *(s+1); | |
463 | ++s; | |
464 | --c; | |
465 | } | |
466 | oplp->count--; | |
467 | return; | |
468 | } | |
469 | } | |
470 | abort(); | |
471 | } | |
554776b1 | 472 | |
473 | ||
474 | void reapchild() | |
475 | { | |
476 | union wait status; | |
477 | int pid; | |
478 | ||
479 | while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0) { | |
42b1d0ae | 480 | if (!takedown && (status.w_termsig != 0 || status.w_retcode != 0)) |
589993be | 481 | com_err(whoami, 0, "%d: child exits with signal %d status %d", |
554776b1 | 482 | pid, status.w_termsig, status.w_retcode); |
483 | } | |
484 | } | |
589993be | 485 | |
486 | ||
487 | void godormant() | |
488 | { | |
489 | switch (dormant) { | |
490 | case AWAKE: | |
491 | case GROGGY: | |
492 | com_err(whoami, 0, "requested to go dormant"); | |
493 | break; | |
494 | case ASLEEP: | |
495 | com_err(whoami, 0, "already asleep"); | |
496 | break; | |
497 | case SLEEPY: | |
498 | break; | |
499 | } | |
500 | dormant = SLEEPY; | |
501 | } | |
502 | ||
503 | ||
504 | void gowakeup() | |
505 | { | |
506 | switch (dormant) { | |
507 | case ASLEEP: | |
508 | case SLEEPY: | |
509 | com_err(whoami, 0, "Good morning"); | |
510 | break; | |
511 | case AWAKE: | |
512 | com_err(whoami, 0, "already awake"); | |
513 | break; | |
514 | case GROGGY: | |
515 | break; | |
516 | } | |
517 | dormant = GROGGY; | |
518 | } | |
083a6e94 | 519 | |
520 | ||
521 | sms_setup_signals() | |
522 | { | |
523 | /* There should probably be a few more of these. */ | |
524 | ||
525 | if ((((int)signal (SIGTERM, sigshut)) < 0) || | |
526 | (((int)signal (SIGCHLD, reapchild)) < 0) || | |
527 | (((int)signal (SIGUSR1, godormant)) < 0) || | |
528 | (((int)signal (SIGUSR2, gowakeup)) < 0) || | |
529 | (((int)signal (SIGHUP, sigshut)) < 0)) { | |
530 | com_err(whoami, errno, " Unable to establish signal handlers."); | |
531 | exit(1); | |
532 | } | |
533 | } |