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0fa91a0a | 1 | /* |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * Copyright (C) 1987 by the Massachusetts Institute of Technology | |
7 | * | |
8 | * | |
9 | * SMS server process. | |
10 | * | |
11 | * Most of this is stolen from ../gdb/tsr.c | |
12 | * | |
13 | * You are in a maze of twisty little finite automata, all different. | |
14 | * Let the reader beware. | |
15 | * | |
16 | * $Log$ | |
f5c72293 | 17 | * Revision 1.13 1987-08-04 02:40:30 wesommer |
18 | * Do end run around minor hotspot. | |
0fa91a0a | 19 | * |
f5c72293 | 20 | * Revision 1.12 87/08/04 01:50:00 wesommer |
21 | * Rearranged messages. | |
22 | * | |
b4182127 | 23 | * Revision 1.11 87/07/29 16:04:54 wesommer |
24 | * Add keepalive feature. | |
25 | * | |
0eb9f52f | 26 | * Revision 1.10 87/06/30 20:02:26 wesommer |
27 | * Added returned tuple chain to client structure. | |
28 | * Added local realm global variable. | |
29 | * | |
4a06eb54 | 30 | * Revision 1.9 87/06/21 16:39:54 wesommer |
31 | * Performance work, rearrangement of include files. | |
32 | * | |
c27b3454 | 33 | * Revision 1.8 87/06/09 18:44:45 wesommer |
34 | * modified error handling. | |
35 | * | |
7f024a70 | 36 | * Revision 1.7 87/06/08 02:44:44 wesommer |
37 | * Minor lint fix. | |
38 | * | |
467f5982 | 39 | * Revision 1.6 87/06/03 17:41:00 wesommer |
40 | * Added startup support. | |
41 | * | |
f6cc38de | 42 | * Revision 1.5 87/06/03 16:07:17 wesommer |
43 | * Fixes for lint. | |
44 | * | |
5dbd09a0 | 45 | * Revision 1.4 87/06/02 20:05:11 wesommer |
46 | * Bug fixes on memory allocation. | |
47 | * | |
0ec57336 | 48 | * Revision 1.3 87/06/01 04:34:27 wesommer |
49 | * Changed returned error code. | |
50 | * | |
d9ecb02a | 51 | * Revision 1.2 87/06/01 03:34:53 wesommer |
52 | * Added shutdown, logging. | |
53 | * | |
70d54e43 | 54 | * Revision 1.1 87/05/31 22:06:56 wesommer |
55 | * Initial revision | |
56 | * | |
0fa91a0a | 57 | */ |
58 | ||
0fa91a0a | 59 | static char *rcsid_sms_main_c = "$Header$"; |
0fa91a0a | 60 | |
70d54e43 | 61 | #include <strings.h> |
62 | #include <sys/errno.h> | |
70d54e43 | 63 | #include <sys/signal.h> |
0fa91a0a | 64 | #include "sms_server.h" |
70d54e43 | 65 | |
0ec57336 | 66 | extern CONNECTION newconn, listencon; |
0fa91a0a | 67 | |
0ec57336 | 68 | extern int nclients; |
69 | extern client **clients, *cur_client; | |
0fa91a0a | 70 | |
0ec57336 | 71 | extern OPERATION listenop; |
72 | extern LIST_OF_OPERATIONS op_list; | |
0fa91a0a | 73 | |
0ec57336 | 74 | extern struct sockaddr_in client_addr; |
75 | extern int client_addrlen; | |
76 | extern TUPLE client_tuple; | |
0fa91a0a | 77 | |
0ec57336 | 78 | extern char *whoami; |
79 | extern char buf1[BUFSIZ]; | |
80 | extern char *takedown; | |
81 | extern int errno; | |
0fa91a0a | 82 | |
70d54e43 | 83 | |
0ec57336 | 84 | extern char *malloc(); |
f5c72293 | 85 | extern int free(); |
0ec57336 | 86 | extern char *inet_ntoa(); |
87 | extern void sms_com_err(); | |
88 | extern void do_client(); | |
70d54e43 | 89 | |
0ec57336 | 90 | extern int sigshut(); |
91 | void clist_append(); | |
92 | void oplist_append(); | |
93 | extern u_short ntohs(); | |
0fa91a0a | 94 | |
0eb9f52f | 95 | extern time_t now; |
96 | ||
0ec57336 | 97 | /* |
98 | * Main SMS server loop. | |
99 | * | |
100 | * Initialize the world, then start accepting connections and | |
101 | * making progress on current connections. | |
102 | */ | |
0fa91a0a | 103 | |
0ec57336 | 104 | /*ARGSUSED*/ |
105 | int | |
0fa91a0a | 106 | main(argc, argv) |
70d54e43 | 107 | int argc; |
108 | char **argv; | |
0fa91a0a | 109 | { |
0ec57336 | 110 | int status; |
0eb9f52f | 111 | time_t tardy; |
0ec57336 | 112 | |
113 | whoami = argv[0]; | |
114 | /* | |
115 | * Error handler init. | |
116 | */ | |
117 | init_sms_err_tbl(); | |
118 | init_krb_err_tbl(); | |
119 | set_com_err_hook(sms_com_err); | |
b4182127 | 120 | setlinebuf(stderr); |
121 | ||
0ec57336 | 122 | if (argc != 1) { |
123 | com_err(whoami, 0, "Usage: smsd"); | |
124 | exit(1); | |
125 | } | |
f5c72293 | 126 | |
127 | /* Profiling implies that getting rid of one level of call | |
128 | * indirection here wins us maybe 1% on the VAX. | |
129 | */ | |
130 | gdb_amv = malloc; | |
131 | gdb_fmv = free; | |
0ec57336 | 132 | |
133 | /* | |
134 | * GDB initialization. | |
135 | */ | |
5dbd09a0 | 136 | if(gdb_init() != 0) { |
137 | com_err(whoami, 0, "GDB initialization failed."); | |
138 | exit(1); | |
139 | } | |
7f024a70 | 140 | gdb_debug(0); /* this can be patched, if necessary, to enable */ |
141 | /* GDB level debugging .. */ | |
4a06eb54 | 142 | krb_realm = malloc(REALM_SZ); |
143 | get_krbrlm(krb_realm, 1); | |
7f024a70 | 144 | |
f6cc38de | 145 | /* |
146 | * Database initialization. | |
147 | */ | |
148 | ||
149 | if ((status = sms_open_database()) != 0) { | |
150 | com_err(whoami, status, "when trying to open database."); | |
151 | exit(1); | |
152 | } | |
153 | ||
0ec57336 | 154 | /* |
155 | * Set up client array handler. | |
156 | */ | |
0fa91a0a | 157 | nclients = 0; |
158 | clients = (client **) malloc(0); | |
70d54e43 | 159 | |
0ec57336 | 160 | /* |
161 | * Signal handlers | |
f6cc38de | 162 | * There should probably be a few more of these. |
0ec57336 | 163 | */ |
70d54e43 | 164 | |
0ec57336 | 165 | if ((((int)signal (SIGTERM, sigshut)) < 0) || |
166 | (((int)signal (SIGHUP, sigshut)) < 0)) { | |
167 | com_err(whoami, errno, "Unable to establish signal handler."); | |
168 | exit(1); | |
169 | } | |
170 | ||
171 | /* | |
172 | * Establish template connection. | |
173 | */ | |
174 | if ((status = do_listen()) != 0) { | |
175 | com_err(whoami, status, | |
176 | "while trying to create listening connection"); | |
177 | exit(1); | |
178 | } | |
0fa91a0a | 179 | |
0fa91a0a | 180 | op_list = create_list_of_operations(1, listenop); |
0fa91a0a | 181 | |
b4182127 | 182 | com_err(whoami, 0, "started (pid %d)", getpid()); |
0ec57336 | 183 | com_err(whoami, 0, rcsid_sms_main_c); |
184 | ||
185 | /* | |
186 | * Run until shut down. | |
187 | */ | |
70d54e43 | 188 | while(!takedown) { |
0ec57336 | 189 | register int i; |
190 | /* | |
191 | * Block until something happens. | |
192 | */ | |
5dbd09a0 | 193 | #ifdef notdef |
194 | com_err(whoami, 0, "tick"); | |
195 | #endif notdef | |
196 | errno = 0; | |
197 | status = op_select_any(op_list, 0, | |
198 | (fd_set *)NULL, (fd_set *)NULL, | |
199 | (fd_set *)NULL, (struct timeval *)NULL); | |
200 | ||
201 | if (status == -1) { | |
202 | com_err(whoami, errno, "error from op_select"); | |
203 | continue; | |
204 | } else if (status != -2) { | |
205 | com_err(whoami, 0, "wrong return from op_select_any"); | |
206 | continue; | |
207 | } | |
70d54e43 | 208 | if (takedown) break; |
0eb9f52f | 209 | time(&now); |
70d54e43 | 210 | #ifdef notdef |
211 | fprintf(stderr, " tick\n"); | |
212 | #endif notdef | |
b4182127 | 213 | /* |
214 | * Handle any new connections; this comes first so | |
215 | * errno isn't tromped on. | |
216 | */ | |
217 | if (OP_DONE(listenop)) { | |
218 | if (OP_STATUS(listenop) == OP_CANCELLED) { | |
219 | if (errno == EWOULDBLOCK) { | |
220 | do_reset_listen(); | |
221 | } else { | |
222 | com_err(whoami, errno, | |
223 | "error on listen"); | |
224 | exit(1); | |
225 | } | |
226 | } else if ((status = new_connection()) != 0) { | |
227 | com_err(whoami, errno, | |
228 | "Error on listening operation."); | |
229 | /* | |
230 | * Sleep here to prevent hosing? | |
231 | */ | |
232 | } | |
233 | } | |
0ec57336 | 234 | /* |
235 | * Handle any existing connections. | |
236 | */ | |
0eb9f52f | 237 | tardy = now - 30*60; |
238 | ||
0fa91a0a | 239 | for (i=0; i<nclients; i++) { |
0eb9f52f | 240 | cur_client = clients[i]; |
0fa91a0a | 241 | if (OP_DONE(clients[i]->pending_op)) { |
0eb9f52f | 242 | cur_client->last_time_used = now; |
70d54e43 | 243 | do_client(cur_client); |
0eb9f52f | 244 | } else if (clients[i]->last_time_used < tardy) { |
245 | com_err(whoami, 0, "Shutting down connection due to inactivity"); | |
246 | shutdown(cur_client->con->in.fd, 0); | |
0fa91a0a | 247 | } |
0eb9f52f | 248 | cur_client = NULL; |
249 | if (takedown) break; | |
0fa91a0a | 250 | } |
0fa91a0a | 251 | } |
b4182127 | 252 | com_err(whoami, 0, "%s", takedown); |
f6cc38de | 253 | sms_close_database(); |
0ec57336 | 254 | return 0; |
70d54e43 | 255 | } |
256 | ||
0ec57336 | 257 | /* |
258 | * Set up the template connection and queue the first accept. | |
259 | */ | |
260 | ||
261 | int | |
262 | do_listen() | |
70d54e43 | 263 | { |
0ec57336 | 264 | char *service = index(SMS_GDB_SERV, ':') + 1; |
265 | ||
266 | listencon = create_listening_connection(service); | |
267 | ||
268 | if (listencon == NULL) | |
269 | return errno; | |
270 | ||
271 | listenop = create_operation(); | |
272 | client_addrlen = sizeof(client_addr); | |
273 | ||
274 | start_accepting_client(listencon, listenop, &newconn, | |
275 | (char *)&client_addr, | |
276 | &client_addrlen, &client_tuple); | |
277 | return 0; | |
0fa91a0a | 278 | } |
279 | ||
b4182127 | 280 | |
281 | do_reset_listen() | |
282 | { | |
283 | client_addrlen = sizeof(client_addr); | |
284 | start_accepting_client(listencon, listenop, &newconn, | |
285 | (char *)&client_addr, | |
286 | &client_addrlen, &client_tuple); | |
287 | } | |
288 | ||
0ec57336 | 289 | /* |
290 | * This routine is called when a new connection comes in. | |
291 | * | |
292 | * It sets up a new client and adds it to the list of currently active clients. | |
293 | */ | |
294 | int | |
5dbd09a0 | 295 | new_connection() |
0fa91a0a | 296 | { |
7f024a70 | 297 | register client *cp; |
70d54e43 | 298 | static counter = 0; |
0fa91a0a | 299 | |
0fa91a0a | 300 | /* |
301 | * Make sure there's been no error | |
302 | */ | |
c27b3454 | 303 | if(OP_STATUS(listenop) != OP_COMPLETE) { |
0ec57336 | 304 | return errno; |
c27b3454 | 305 | } |
306 | ||
307 | if (newconn == NULL) { | |
308 | return SMS_NOT_CONNECTED; | |
0fa91a0a | 309 | } |
310 | ||
0fa91a0a | 311 | /* |
312 | * Set up the new connection and reply to the client | |
313 | */ | |
7f024a70 | 314 | cp = (client *)malloc(sizeof *cp); |
0fa91a0a | 315 | cp->state = CL_STARTING; |
316 | cp->action = CL_ACCEPT; | |
317 | cp->con = newconn; | |
70d54e43 | 318 | cp->id = counter++; |
0ec57336 | 319 | cp->args = NULL; |
320 | cp->clname = NULL; | |
321 | cp->reply.sms_argv = NULL; | |
4a06eb54 | 322 | cp->first = NULL; |
323 | cp->last = NULL; | |
0eb9f52f | 324 | cp->last_time_used = now; |
0fa91a0a | 325 | newconn = NULL; |
326 | ||
327 | cp->pending_op = create_operation(); | |
328 | reset_operation(cp->pending_op); | |
329 | oplist_append(&op_list, cp->pending_op); | |
70d54e43 | 330 | cur_client = cp; |
331 | ||
0ec57336 | 332 | /* |
333 | * Add a new client to the array.. | |
334 | */ | |
335 | clist_append(cp); | |
336 | ||
337 | /* | |
338 | * Let him know we heard him. | |
339 | */ | |
0fa91a0a | 340 | start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, |
341 | "", ""); | |
0ec57336 | 342 | |
343 | cp->haddr = client_addr; | |
344 | ||
345 | /* | |
346 | * Log new connection. | |
347 | */ | |
348 | ||
b4182127 | 349 | com_err(whoami, 0, "New connection from %s port %d (now %d client%s)", |
350 | inet_ntoa(cp->haddr.sin_addr), | |
351 | (int)ntohs(cp->haddr.sin_port), | |
352 | nclients, | |
353 | nclients!=1?"s":""); | |
0fa91a0a | 354 | |
355 | /* | |
0ec57336 | 356 | * Get ready to accept the next connection. |
0fa91a0a | 357 | */ |
358 | reset_operation(listenop); | |
0ec57336 | 359 | client_addrlen = sizeof(client_addr); |
0fa91a0a | 360 | |
361 | start_accepting_client(listencon, listenop, &newconn, | |
0ec57336 | 362 | (char *)&client_addr, |
363 | &client_addrlen, &client_tuple); | |
364 | return 0; | |
0fa91a0a | 365 | } |
366 | ||
0fa91a0a | 367 | /* |
368 | * Add a new client to the known clients. | |
369 | */ | |
0ec57336 | 370 | void |
0fa91a0a | 371 | clist_append(cp) |
372 | client *cp; | |
373 | { | |
374 | client **clients_n; | |
375 | ||
376 | nclients++; | |
0ec57336 | 377 | clients_n = (client **)malloc |
378 | ((unsigned)(nclients * sizeof(client *))); | |
0fa91a0a | 379 | bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp)); |
380 | clients_n[nclients-1] = cp; | |
381 | free((char *)clients); | |
382 | clients = clients_n; | |
383 | clients_n = NULL; | |
384 | } | |
385 | ||
70d54e43 | 386 | |
0ec57336 | 387 | void |
70d54e43 | 388 | clist_delete(cp) |
389 | client *cp; | |
390 | { | |
70d54e43 | 391 | client **clients_n, **scpp, **dcpp; /* source and dest client */ |
392 | /* ptr ptr */ | |
393 | ||
70d54e43 | 394 | int found_it = 0; |
395 | ||
0ec57336 | 396 | clients_n = (client **)malloc |
397 | ((unsigned)((nclients - 1)* sizeof(client *))); | |
70d54e43 | 398 | for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) { |
399 | if (*scpp != cp) { | |
400 | *dcpp++ = *scpp++; | |
401 | } else { | |
402 | scpp++; | |
403 | if (found_it) abort(); | |
404 | found_it = 1; | |
405 | } | |
406 | } | |
407 | --nclients; | |
408 | free((char *)clients); | |
409 | clients = clients_n; | |
410 | clients_n = NULL; | |
c27b3454 | 411 | oplist_delete(op_list, cp->pending_op); |
70d54e43 | 412 | reset_operation(cp->pending_op); |
413 | delete_operation(cp->pending_op); | |
7f024a70 | 414 | sever_connection(cp->con); |
0ec57336 | 415 | free((char *)cp); |
70d54e43 | 416 | } |
0ec57336 | 417 | |
0fa91a0a | 418 | /* |
0ec57336 | 419 | * Add a new operation to a list of operations. |
420 | * | |
421 | * This should be rewritten to use realloc instead, since in most | |
422 | * cases it won't have to copy the array. | |
0fa91a0a | 423 | */ |
424 | ||
0ec57336 | 425 | void |
0fa91a0a | 426 | oplist_append(oplp, op) |
427 | LIST_OF_OPERATIONS *oplp; | |
428 | OPERATION op; | |
429 | { | |
430 | int count = (*oplp)->count+1; | |
431 | LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS) | |
432 | db_alloc(size_of_list_of_operations(count)); | |
433 | bcopy((char *)(*oplp), (char *)newlist, | |
434 | size_of_list_of_operations((*oplp)->count)); | |
0fa91a0a | 435 | newlist->count++; |
436 | newlist->op[count-1] = op; | |
467f5982 | 437 | db_free((char *)(*oplp), size_of_list_of_operations(count-1)); |
0fa91a0a | 438 | (*oplp) = newlist; |
439 | } | |
440 | ||
c27b3454 | 441 | |
442 | oplist_delete(oplp, op) | |
443 | LIST_OF_OPERATIONS oplp; | |
444 | register OPERATION op; | |
445 | { | |
446 | register OPERATION *s; | |
447 | register int c; | |
448 | ||
449 | for (s = oplp->op, c=oplp->count; c; --c, ++s) { | |
450 | if (*s == op) { | |
451 | while (c > 0) { | |
452 | *s = *(s+1); | |
453 | ++s; | |
454 | --c; | |
455 | } | |
456 | oplp->count--; | |
457 | return; | |
458 | } | |
459 | } | |
460 | abort(); | |
461 | } |