6 * Copyright (C) 1987 by the Massachusetts Institute of Technology
7 * For copying and distribution information, please see the file
10 * MOIRA server process.
12 * Most of this is stolen from ../gdb/tsr.c
14 * You are in a maze of twisty little finite automata, all different.
15 * Let the reader beware.
19 static char *rcsid_mr_main_c = "$Header$";
21 #include <mit-copyright.h>
23 #include <sys/types.h>
24 #include <sys/errno.h>
25 #include <sys/signal.h>
28 #include "mr_server.h"
31 extern CONNECTION newconn, listencon;
34 extern client **clients, *cur_client;
36 extern OPERATION listenop;
37 extern LIST_OF_OPERATIONS op_list;
39 extern struct sockaddr_in client_addr;
40 extern int client_addrlen;
41 extern TUPLE client_tuple;
44 extern char buf1[BUFSIZ];
45 extern char *takedown;
49 extern char *malloc();
51 extern char *inet_ntoa();
52 extern void mr_com_err();
53 extern void do_client();
58 void reapchild(), godormant(), gowakeup();
63 * Main MOIRA server loop.
65 * Initialize the world, then start accepting connections and
66 * making progress on current connections.
78 extern char *database;
85 initialize_sms_error_table();
86 initialize_krb_error_table();
87 initialize_gdss_error_table();
88 set_com_err_hook(mr_com_err);
92 port = index(MOIRA_SERVER, ':') + 1;
94 for (i = 1; i < argc; i++) {
95 if (!strcmp(argv[i], "-db") && i+1 < argc) {
98 } else if (!strcmp(argv[i], "-p") && i+1 < argc) {
102 com_err(whoami, 0, "Usage: moirad [-db database][-p port]");
107 /* Profiling implies that getting rid of one level of call
108 * indirection here wins us maybe 1% on the VAX.
114 * GDB initialization.
116 if(gdb_init() != 0) {
117 com_err(whoami, 0, "GDB initialization failed.");
120 gdb_debug(0); /* this can be patched, if necessary, to enable */
121 /* GDB level debugging .. */
122 krb_realm = malloc(REALM_SZ);
123 krb_get_lrealm(krb_realm, 1);
126 * Database initialization. Only init if database should be open.
129 if (stat(MOIRA_MOTD_FILE, &stbuf) != 0) {
130 if ((status = mr_open_database()) != 0) {
131 com_err(whoami, status, " when trying to open database.");
134 sanity_check_database();
137 com_err(whoami, 0, "sleeping, not opening database");
140 sanity_check_queries();
143 * Set up client array handler.
146 clients = (client **) malloc(0);
150 journal = fopen(JOURNAL, "a");
151 if (journal == NULL) {
152 com_err(whoami, errno, " while opening journal file");
157 * Establish template connection.
159 if ((status = do_listen(port)) != 0) {
160 com_err(whoami, status,
161 " while trying to create listening connection");
165 op_list = create_list_of_operations(1, listenop);
167 com_err(whoami, 0, "started (pid %d)", getpid());
168 com_err(whoami, 0, rcsid_mr_main_c);
169 if (dormant != ASLEEP)
170 send_zgram("MOIRA", "server started");
172 send_zgram("MOIRA", "server started, but database closed");
175 * Run until shut down.
180 * Block until something happens.
183 com_err(whoami, 0, "tick");
185 if (dormant == SLEEPY) {
187 com_err(whoami, 0, "database closed");
189 send_zgram("MOIRA", "database closed");
191 } else if (dormant == GROGGY) {
193 com_err(whoami, 0, "database open");
195 send_zgram("MOIRA", "database open again");
200 status = op_select_any(op_list, 0,
201 (fd_set *)NULL, (fd_set *)NULL,
202 (fd_set *)NULL, (struct timeval *)NULL);
206 com_err(whoami, errno, " error from op_select");
207 if (!inc_running || now - inc_started > INC_TIMEOUT)
210 } else if (status != -2) {
211 com_err(whoami, 0, " wrong return from op_select_any");
216 if (!inc_running || now - inc_started > INC_TIMEOUT)
219 fprintf(stderr, " tick\n");
222 * Handle any new connections; this comes first so
223 * errno isn't tromped on.
225 if (OP_DONE(listenop)) {
226 if (OP_STATUS(listenop) == OP_CANCELLED) {
227 if (errno == EWOULDBLOCK) {
230 static int count = 0;
231 com_err(whoami, errno,
232 " error (%d) on listen", count);
236 } else if ((status = new_connection()) != 0) {
237 com_err(whoami, errno,
238 " Error on listening operation.");
240 * Sleep here to prevent hosing?
243 /* if the new connection is our only connection,
244 * and the server is supposed to be down, then go
247 if ((dormant == AWAKE) && (nclients == 1) &&
248 (stat(MOIRA_MOTD_FILE, &stbuf) == 0)) {
249 com_err(whoami, 0, "motd file exists, slumbertime");
252 /* on new connection, if we are no longer supposed
253 * to be down, then wake up.
255 if ((dormant == ASLEEP) &&
256 (stat(MOIRA_MOTD_FILE, &stbuf) == -1) &&
258 com_err(whoami, 0, "motd file no longer exists, waking up");
264 * Handle any existing connections.
268 for (i=0; i<nclients; i++) {
269 cur_client = clients[i];
270 if (OP_DONE(clients[i]->pending_op)) {
271 cur_client->last_time_used = now;
272 do_client(cur_client);
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);
281 com_err(whoami, 0, "%s", takedown);
283 send_zgram("MOIRA", takedown);
288 * Set up the template connection and queue the first accept.
295 listencon = create_listening_connection(port);
297 if (listencon == NULL)
300 listenop = create_operation();
301 client_addrlen = sizeof(client_addr);
303 start_accepting_client(listencon, listenop, &newconn,
304 (char *)&client_addr,
305 &client_addrlen, &client_tuple);
312 client_addrlen = sizeof(client_addr);
313 start_accepting_client(listencon, listenop, &newconn,
314 (char *)&client_addr,
315 &client_addrlen, &client_tuple);
319 * This routine is called when a new connection comes in.
321 * It sets up a new client and adds it to the list of currently active clients.
330 * Make sure there's been no error
332 if(OP_STATUS(listenop) != OP_COMPLETE) {
336 if (newconn == NULL) {
337 return MR_NOT_CONNECTED;
341 * Set up the new connection and reply to the client
343 cp = (client *)malloc(sizeof *cp);
344 bzero(cp, sizeof(*cp));
345 cp->action = CL_ACCEPT;
349 cp->clname[0] = NULL;
350 cp->reply.mr_argv = NULL;
353 cp->last_time_used = now;
356 cp->pending_op = create_operation();
357 reset_operation(cp->pending_op);
358 oplist_append(&op_list, cp->pending_op);
362 * Add a new client to the array..
367 * Let him know we heard him.
369 start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED,
372 cp->haddr = client_addr;
375 * Log new connection.
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),
385 * Get ready to accept the next connection.
387 reset_operation(listenop);
388 client_addrlen = sizeof(client_addr);
390 start_accepting_client(listencon, listenop, &newconn,
391 (char *)&client_addr,
392 &client_addrlen, &client_tuple);
397 * Add a new client to the known clients.
406 clients_n = (client **)malloc
407 ((unsigned)(nclients * sizeof(client *)));
408 bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp));
409 clients_n[nclients-1] = cp;
410 free((char *)clients);
420 client **clients_n, **scpp, **dcpp; /* source and dest client */
425 clients_n = (client **)malloc
426 ((unsigned)((nclients - 1)* sizeof(client *)));
427 for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) {
432 if (found_it) abort();
437 free((char *)clients);
440 oplist_delete(op_list, cp->pending_op);
441 reset_operation(cp->pending_op);
442 delete_operation(cp->pending_op);
443 sever_connection(cp->con);
448 * Add a new operation to a list of operations.
450 * This should be rewritten to use realloc instead, since in most
451 * cases it won't have to copy the array.
455 oplist_append(oplp, op)
456 LIST_OF_OPERATIONS *oplp;
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));
465 newlist->op[count-1] = op;
466 db_free((char *)(*oplp), size_of_list_of_operations(count-1));
471 oplist_delete(oplp, op)
472 LIST_OF_OPERATIONS oplp;
473 register OPERATION op;
475 register OPERATION *s;
478 for (s = oplp->op, c=oplp->count; c; --c, ++s) {
498 while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0) {
501 if (!takedown && (status.w_termsig != 0 || status.w_retcode != 0))
502 com_err(whoami, 0, "%d: child exits with signal %d status %d",
503 pid, status.w_termsig, status.w_retcode);
513 com_err(whoami, 0, "requested to go dormant");
516 com_err(whoami, 0, "already asleep");
530 com_err(whoami, 0, "Good morning");
533 com_err(whoami, 0, "already awake");
544 /* There should probably be a few more of these. */
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.");