]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * Copyright (C) 1987 by the Massachusetts Institute of Technology | |
7 | * For copying and distribution information, please see the file | |
8 | * <mit-copyright.h>. | |
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 | * | |
17 | */ | |
18 | ||
19 | static char *rcsid_sms_main_c = "$Header$"; | |
20 | ||
21 | #include <mit-copyright.h> | |
22 | #include <strings.h> | |
23 | #include <sys/errno.h> | |
24 | #include <sys/signal.h> | |
25 | #include <sys/wait.h> | |
26 | #include "sms_server.h" | |
27 | ||
28 | extern CONNECTION newconn, listencon; | |
29 | ||
30 | extern int nclients; | |
31 | extern client **clients, *cur_client; | |
32 | ||
33 | extern OPERATION listenop; | |
34 | extern LIST_OF_OPERATIONS op_list; | |
35 | ||
36 | extern struct sockaddr_in client_addr; | |
37 | extern int client_addrlen; | |
38 | extern TUPLE client_tuple; | |
39 | ||
40 | extern char *whoami; | |
41 | extern char buf1[BUFSIZ]; | |
42 | extern char *takedown; | |
43 | extern int errno; | |
44 | extern FILE *journal; | |
45 | #define JOURNAL "/u1/sms/journal" | |
46 | ||
47 | extern char *malloc(); | |
48 | extern int free(); | |
49 | extern char *inet_ntoa(); | |
50 | extern void sms_com_err(); | |
51 | extern void do_client(); | |
52 | ||
53 | extern int sigshut(); | |
54 | void clist_append(); | |
55 | void oplist_append(); | |
56 | void reapchild(); | |
57 | ||
58 | extern time_t now; | |
59 | ||
60 | /* | |
61 | * Main SMS server loop. | |
62 | * | |
63 | * Initialize the world, then start accepting connections and | |
64 | * making progress on current connections. | |
65 | */ | |
66 | ||
67 | /*ARGSUSED*/ | |
68 | int | |
69 | main(argc, argv) | |
70 | int argc; | |
71 | char **argv; | |
72 | { | |
73 | int status; | |
74 | time_t tardy; | |
75 | ||
76 | whoami = argv[0]; | |
77 | /* | |
78 | * Error handler init. | |
79 | */ | |
80 | init_sms_err_tbl(); | |
81 | init_krb_err_tbl(); | |
82 | set_com_err_hook(sms_com_err); | |
83 | setlinebuf(stderr); | |
84 | ||
85 | if (argc != 1) { | |
86 | com_err(whoami, 0, "Usage: smsd"); | |
87 | exit(1); | |
88 | } | |
89 | ||
90 | /* Profiling implies that getting rid of one level of call | |
91 | * indirection here wins us maybe 1% on the VAX. | |
92 | */ | |
93 | gdb_amv = malloc; | |
94 | gdb_fmv = free; | |
95 | ||
96 | /* | |
97 | * GDB initialization. | |
98 | */ | |
99 | if(gdb_init() != 0) { | |
100 | com_err(whoami, 0, "GDB initialization failed."); | |
101 | exit(1); | |
102 | } | |
103 | gdb_debug(0); /* this can be patched, if necessary, to enable */ | |
104 | /* GDB level debugging .. */ | |
105 | krb_realm = malloc(REALM_SZ); | |
106 | get_krbrlm(krb_realm, 1); | |
107 | ||
108 | /* | |
109 | * Database initialization. | |
110 | */ | |
111 | ||
112 | if ((status = sms_open_database()) != 0) { | |
113 | com_err(whoami, status, " when trying to open database."); | |
114 | exit(1); | |
115 | } | |
116 | ||
117 | sanity_check_queries(); | |
118 | sanity_check_database(); | |
119 | ||
120 | /* | |
121 | * Set up client array handler. | |
122 | */ | |
123 | nclients = 0; | |
124 | clients = (client **) malloc(0); | |
125 | ||
126 | /* | |
127 | * Signal handlers | |
128 | * There should probably be a few more of these. | |
129 | */ | |
130 | ||
131 | if ((((int)signal (SIGTERM, sigshut)) < 0) || | |
132 | (((int)signal (SIGCHLD, reapchild)) < 0) || | |
133 | (((int)signal (SIGHUP, sigshut)) < 0)) { | |
134 | com_err(whoami, errno, " Unable to establish signal handler."); | |
135 | exit(1); | |
136 | } | |
137 | ||
138 | journal = fopen(JOURNAL, "a"); | |
139 | if (journal == NULL) { | |
140 | com_err(whoami, errno, " while opening journal file"); | |
141 | exit(1); | |
142 | } | |
143 | ||
144 | /* | |
145 | * Establish template connection. | |
146 | */ | |
147 | if ((status = do_listen()) != 0) { | |
148 | com_err(whoami, status, | |
149 | " while trying to create listening connection"); | |
150 | exit(1); | |
151 | } | |
152 | ||
153 | op_list = create_list_of_operations(1, listenop); | |
154 | ||
155 | com_err(whoami, 0, "started (pid %d)", getpid()); | |
156 | com_err(whoami, 0, rcsid_sms_main_c); | |
157 | send_zgram("SMS", "server started"); | |
158 | ||
159 | /* | |
160 | * Run until shut down. | |
161 | */ | |
162 | while(!takedown) { | |
163 | register int i; | |
164 | /* | |
165 | * Block until something happens. | |
166 | */ | |
167 | #ifdef notdef | |
168 | com_err(whoami, 0, "tick"); | |
169 | #endif notdef | |
170 | errno = 0; | |
171 | status = op_select_any(op_list, 0, | |
172 | (fd_set *)NULL, (fd_set *)NULL, | |
173 | (fd_set *)NULL, (struct timeval *)NULL); | |
174 | ||
175 | if (status == -1) { | |
176 | com_err(whoami, errno, " error from op_select"); | |
177 | continue; | |
178 | } else if (status != -2) { | |
179 | com_err(whoami, 0, " wrong return from op_select_any"); | |
180 | continue; | |
181 | } | |
182 | if (takedown) break; | |
183 | time(&now); | |
184 | #ifdef notdef | |
185 | fprintf(stderr, " tick\n"); | |
186 | #endif notdef | |
187 | /* | |
188 | * Handle any new connections; this comes first so | |
189 | * errno isn't tromped on. | |
190 | */ | |
191 | if (OP_DONE(listenop)) { | |
192 | if (OP_STATUS(listenop) == OP_CANCELLED) { | |
193 | if (errno == EWOULDBLOCK) { | |
194 | do_reset_listen(); | |
195 | } else { | |
196 | com_err(whoami, errno, | |
197 | " error on listen"); | |
198 | exit(1); | |
199 | } | |
200 | } else if ((status = new_connection()) != 0) { | |
201 | com_err(whoami, errno, | |
202 | " Error on listening operation."); | |
203 | /* | |
204 | * Sleep here to prevent hosing? | |
205 | */ | |
206 | } | |
207 | } | |
208 | /* | |
209 | * Handle any existing connections. | |
210 | */ | |
211 | tardy = now - 30*60; | |
212 | ||
213 | for (i=0; i<nclients; i++) { | |
214 | cur_client = clients[i]; | |
215 | if (OP_DONE(clients[i]->pending_op)) { | |
216 | cur_client->last_time_used = now; | |
217 | do_client(cur_client); | |
218 | } else if (clients[i]->last_time_used < tardy) { | |
219 | com_err(whoami, 0, "Shutting down connection due to inactivity"); | |
220 | shutdown(cur_client->con->in.fd, 0); | |
221 | } | |
222 | cur_client = NULL; | |
223 | if (takedown) break; | |
224 | } | |
225 | } | |
226 | com_err(whoami, 0, "%s", takedown); | |
227 | sms_close_database(); | |
228 | send_zgram("SMS", takedown); | |
229 | return 0; | |
230 | } | |
231 | ||
232 | /* | |
233 | * Set up the template connection and queue the first accept. | |
234 | */ | |
235 | ||
236 | int | |
237 | do_listen() | |
238 | { | |
239 | char *service = index(SMS_GDB_SERV, ':') + 1; | |
240 | ||
241 | listencon = create_listening_connection(service); | |
242 | ||
243 | if (listencon == NULL) | |
244 | return errno; | |
245 | ||
246 | listenop = create_operation(); | |
247 | client_addrlen = sizeof(client_addr); | |
248 | ||
249 | start_accepting_client(listencon, listenop, &newconn, | |
250 | (char *)&client_addr, | |
251 | &client_addrlen, &client_tuple); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | ||
256 | do_reset_listen() | |
257 | { | |
258 | client_addrlen = sizeof(client_addr); | |
259 | start_accepting_client(listencon, listenop, &newconn, | |
260 | (char *)&client_addr, | |
261 | &client_addrlen, &client_tuple); | |
262 | } | |
263 | ||
264 | /* | |
265 | * This routine is called when a new connection comes in. | |
266 | * | |
267 | * It sets up a new client and adds it to the list of currently active clients. | |
268 | */ | |
269 | int | |
270 | new_connection() | |
271 | { | |
272 | register client *cp; | |
273 | static counter = 0; | |
274 | ||
275 | /* | |
276 | * Make sure there's been no error | |
277 | */ | |
278 | if(OP_STATUS(listenop) != OP_COMPLETE) { | |
279 | return errno; | |
280 | } | |
281 | ||
282 | if (newconn == NULL) { | |
283 | return SMS_NOT_CONNECTED; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Set up the new connection and reply to the client | |
288 | */ | |
289 | cp = (client *)malloc(sizeof *cp); | |
290 | bzero(cp, sizeof(*cp)); | |
291 | cp->action = CL_ACCEPT; | |
292 | cp->con = newconn; | |
293 | cp->id = counter++; | |
294 | cp->args = NULL; | |
295 | cp->clname = NULL; | |
296 | cp->reply.sms_argv = NULL; | |
297 | cp->first = NULL; | |
298 | cp->last = NULL; | |
299 | cp->last_time_used = now; | |
300 | newconn = NULL; | |
301 | ||
302 | cp->pending_op = create_operation(); | |
303 | reset_operation(cp->pending_op); | |
304 | oplist_append(&op_list, cp->pending_op); | |
305 | cur_client = cp; | |
306 | ||
307 | /* | |
308 | * Add a new client to the array.. | |
309 | */ | |
310 | clist_append(cp); | |
311 | ||
312 | /* | |
313 | * Let him know we heard him. | |
314 | */ | |
315 | start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, | |
316 | "", ""); | |
317 | ||
318 | cp->haddr = client_addr; | |
319 | ||
320 | /* | |
321 | * Log new connection. | |
322 | */ | |
323 | ||
324 | com_err(whoami, 0, "New connection from %s port %d (now %d client%s)", | |
325 | inet_ntoa(cp->haddr.sin_addr), | |
326 | (int)ntohs(cp->haddr.sin_port), | |
327 | nclients, | |
328 | nclients!=1?"s":""); | |
329 | ||
330 | /* | |
331 | * Get ready to accept the next connection. | |
332 | */ | |
333 | reset_operation(listenop); | |
334 | client_addrlen = sizeof(client_addr); | |
335 | ||
336 | start_accepting_client(listencon, listenop, &newconn, | |
337 | (char *)&client_addr, | |
338 | &client_addrlen, &client_tuple); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Add a new client to the known clients. | |
344 | */ | |
345 | void | |
346 | clist_append(cp) | |
347 | client *cp; | |
348 | { | |
349 | client **clients_n; | |
350 | ||
351 | nclients++; | |
352 | clients_n = (client **)malloc | |
353 | ((unsigned)(nclients * sizeof(client *))); | |
354 | bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp)); | |
355 | clients_n[nclients-1] = cp; | |
356 | free((char *)clients); | |
357 | clients = clients_n; | |
358 | clients_n = NULL; | |
359 | } | |
360 | ||
361 | ||
362 | void | |
363 | clist_delete(cp) | |
364 | client *cp; | |
365 | { | |
366 | client **clients_n, **scpp, **dcpp; /* source and dest client */ | |
367 | /* ptr ptr */ | |
368 | ||
369 | int found_it = 0; | |
370 | ||
371 | clients_n = (client **)malloc | |
372 | ((unsigned)((nclients - 1)* sizeof(client *))); | |
373 | for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) { | |
374 | if (*scpp != cp) { | |
375 | *dcpp++ = *scpp++; | |
376 | } else { | |
377 | scpp++; | |
378 | if (found_it) abort(); | |
379 | found_it = 1; | |
380 | } | |
381 | } | |
382 | --nclients; | |
383 | free((char *)clients); | |
384 | clients = clients_n; | |
385 | clients_n = NULL; | |
386 | oplist_delete(op_list, cp->pending_op); | |
387 | reset_operation(cp->pending_op); | |
388 | delete_operation(cp->pending_op); | |
389 | sever_connection(cp->con); | |
390 | free((char *)cp); | |
391 | } | |
392 | ||
393 | /* | |
394 | * Add a new operation to a list of operations. | |
395 | * | |
396 | * This should be rewritten to use realloc instead, since in most | |
397 | * cases it won't have to copy the array. | |
398 | */ | |
399 | ||
400 | void | |
401 | oplist_append(oplp, op) | |
402 | LIST_OF_OPERATIONS *oplp; | |
403 | OPERATION op; | |
404 | { | |
405 | int count = (*oplp)->count+1; | |
406 | LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS) | |
407 | db_alloc(size_of_list_of_operations(count)); | |
408 | bcopy((char *)(*oplp), (char *)newlist, | |
409 | size_of_list_of_operations((*oplp)->count)); | |
410 | newlist->count++; | |
411 | newlist->op[count-1] = op; | |
412 | db_free((char *)(*oplp), size_of_list_of_operations(count-1)); | |
413 | (*oplp) = newlist; | |
414 | } | |
415 | ||
416 | ||
417 | oplist_delete(oplp, op) | |
418 | LIST_OF_OPERATIONS oplp; | |
419 | register OPERATION op; | |
420 | { | |
421 | register OPERATION *s; | |
422 | register int c; | |
423 | ||
424 | for (s = oplp->op, c=oplp->count; c; --c, ++s) { | |
425 | if (*s == op) { | |
426 | while (c > 0) { | |
427 | *s = *(s+1); | |
428 | ++s; | |
429 | --c; | |
430 | } | |
431 | oplp->count--; | |
432 | return; | |
433 | } | |
434 | } | |
435 | abort(); | |
436 | } | |
437 | ||
438 | ||
439 | void reapchild() | |
440 | { | |
441 | union wait status; | |
442 | int pid; | |
443 | ||
444 | if (takedown) | |
445 | return; | |
446 | while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0) { | |
447 | if (status.w_termsig == 0 && status.w_retcode == 0) | |
448 | com_err(whoami, 0, "dcm started successfully"); | |
449 | else | |
450 | com_err(whoami, 0, "%d: startdcm exits with signal %d status %d", | |
451 | pid, status.w_termsig, status.w_retcode); | |
452 | } | |
453 | } |