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Commit | Line | Data |
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7ac48069 | 1 | /* $Id$ |
0fa91a0a | 2 | * |
7ac48069 | 3 | * Moira server process. |
0fa91a0a | 4 | * |
7ac48069 | 5 | * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology |
6 | * For copying and distribution information, please see the file | |
7 | * <mit-copyright.h>. | |
5eaef520 | 8 | * |
0fa91a0a | 9 | */ |
10 | ||
c801de4c | 11 | #include <mit-copyright.h> |
7ac48069 | 12 | #include "mr_server.h" |
13 | ||
14 | #include <sys/socket.h> | |
15 | #include <sys/stat.h> | |
589993be | 16 | #include <sys/types.h> |
7ac48069 | 17 | #include <sys/utsname.h> |
554776b1 | 18 | #include <sys/wait.h> |
7ac48069 | 19 | |
20 | #include <netinet/in.h> | |
03c05291 | 21 | #include <arpa/inet.h> |
70d54e43 | 22 | |
7ac48069 | 23 | #include <ctype.h> |
24 | #include <errno.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | ||
85330553 | 31 | #include <krb.h> |
32 | ||
7ac48069 | 33 | RCSID("$Header$"); |
34 | ||
85330553 | 35 | client *cur_client; |
0fa91a0a | 36 | |
85330553 | 37 | char *whoami; |
38 | char *takedown; | |
39 | FILE *journal; | |
0fa91a0a | 40 | |
85330553 | 41 | time_t now; |
0fa91a0a | 42 | |
85330553 | 43 | char *host; |
44 | char krb_realm[REALM_SZ]; | |
70d54e43 | 45 | |
85330553 | 46 | /* Client array and associated data. This needs to be global for _list_users */ |
47 | client **clients; | |
48 | int nclients, clientssize; | |
0eb9f52f | 49 | |
85330553 | 50 | int dormant; |
3d0d0f07 | 51 | |
7ac48069 | 52 | void reapchild(int x); |
53 | void godormant(int x); | |
54 | void gowakeup(int x); | |
03c05291 | 55 | void clist_append(client *cp); |
03c05291 | 56 | void mr_setup_signals(void); |
e448f08d | 57 | |
0ec57336 | 58 | /* |
59ec8dae | 59 | * Main Moira server loop. |
0ec57336 | 60 | * |
61 | * Initialize the world, then start accepting connections and | |
62 | * making progress on current connections. | |
63 | */ | |
0fa91a0a | 64 | |
5eaef520 | 65 | int main(int argc, char **argv) |
0fa91a0a | 66 | { |
85330553 | 67 | int status, i, listener; |
5eaef520 | 68 | time_t tardy; |
69 | char *port, *p; | |
70 | extern char *database; | |
71 | struct stat stbuf; | |
7ac48069 | 72 | struct utsname uts; |
85330553 | 73 | fd_set readfds, writefds, xreadfds, xwritefds; |
74 | int nfds, counter = 0; | |
5eaef520 | 75 | |
76 | whoami = argv[0]; | |
77 | /* | |
78 | * Error handler init. | |
79 | */ | |
85330553 | 80 | mr_init(); |
5eaef520 | 81 | set_com_err_hook(mr_com_err); |
82 | setvbuf(stderr, NULL, _IOLBF, BUFSIZ); | |
83 | ||
84 | port = strchr(MOIRA_SERVER, ':') + 1; | |
85 | ||
86 | for (i = 1; i < argc; i++) | |
87 | { | |
88 | if (!strcmp(argv[i], "-db") && i + 1 < argc) | |
89 | { | |
90 | database = argv[i + 1]; | |
91 | i++; | |
5dbd09a0 | 92 | } |
5eaef520 | 93 | else if (!strcmp(argv[i], "-p") && i + 1 < argc) |
94 | { | |
95 | port = argv[i + 1]; | |
96 | i++; | |
f6cc38de | 97 | } |
5eaef520 | 98 | else |
99 | { | |
100 | com_err(whoami, 0, "Usage: moirad [-db database][-p port]"); | |
3d0d0f07 | 101 | exit(1); |
102 | } | |
5eaef520 | 103 | } |
104 | ||
5eaef520 | 105 | krb_get_lrealm(krb_realm, 1); |
106 | ||
107 | /* | |
108 | * Database initialization. Only init if database should be open. | |
109 | */ | |
110 | ||
111 | if (stat(MOIRA_MOTD_FILE, &stbuf) != 0) | |
112 | { | |
113 | if ((status = mr_open_database())) | |
114 | { | |
85330553 | 115 | com_err(whoami, status, "trying to open database."); |
5eaef520 | 116 | exit(1); |
2f4ff9cd | 117 | } |
5eaef520 | 118 | sanity_check_database(); |
119 | } | |
120 | else | |
121 | { | |
122 | dormant = ASLEEP; | |
123 | com_err(whoami, 0, "sleeping, not opening database"); | |
124 | } | |
2f4ff9cd | 125 | |
5eaef520 | 126 | sanity_check_queries(); |
127 | ||
128 | /* | |
129 | * Get moira server hostname for authentication | |
130 | */ | |
7ac48069 | 131 | if (uname(&uts) < 0) |
5eaef520 | 132 | { |
133 | com_err(whoami, errno, "Unable to get local hostname"); | |
134 | exit(1); | |
135 | } | |
e688520a | 136 | host = canonicalize_hostname(xstrdup(uts.nodename)); |
5eaef520 | 137 | for (p = host; *p && *p != '.'; p++) |
138 | { | |
139 | if (isupper(*p)) | |
140 | *p = tolower(*p); | |
141 | } | |
142 | *p = '\0'; | |
143 | ||
144 | /* | |
145 | * Set up client array handler. | |
146 | */ | |
147 | nclients = 0; | |
85330553 | 148 | clientssize = 10; |
e688520a | 149 | clients = xmalloc(clientssize * sizeof(client *)); |
5eaef520 | 150 | |
151 | mr_setup_signals(); | |
152 | ||
153 | journal = fopen(JOURNAL, "a"); | |
154 | if (!journal) | |
155 | { | |
85330553 | 156 | com_err(whoami, errno, "opening journal file"); |
5eaef520 | 157 | exit(1); |
158 | } | |
159 | ||
160 | /* | |
161 | * Establish template connection. | |
162 | */ | |
da6a4096 | 163 | listener = mr_listen(port); |
164 | if (listener == -1) | |
5eaef520 | 165 | { |
85330553 | 166 | com_err(whoami, status, "trying to create listening connection"); |
5eaef520 | 167 | exit(1); |
168 | } | |
85330553 | 169 | FD_ZERO(&xreadfds); |
170 | FD_ZERO(&xwritefds); | |
171 | FD_SET(listener, &xreadfds); | |
172 | nfds = listener + 1; | |
5eaef520 | 173 | |
174 | com_err(whoami, 0, "started (pid %d)", getpid()); | |
7ac48069 | 175 | com_err(whoami, 0, rcsid); |
5eaef520 | 176 | if (dormant != ASLEEP) |
177 | send_zgram("MOIRA", "server started"); | |
178 | else | |
179 | send_zgram("MOIRA", "server started, but database closed"); | |
180 | ||
181 | /* | |
182 | * Run until shut down. | |
183 | */ | |
184 | while (!takedown) | |
185 | { | |
44d12d58 | 186 | int i; |
9294e804 | 187 | struct timeval timeout = {60, 0}; /* 1 minute */ |
85330553 | 188 | |
189 | /* If we're supposed to go down and we can, do it */ | |
59ad5a76 | 190 | if (((dormant == AWAKE) && (nclients == 0) && |
191 | (stat(MOIRA_MOTD_FILE, &stbuf) == 0)) || | |
192 | (dormant == SLEEPY)) | |
5eaef520 | 193 | { |
194 | mr_close_database(); | |
195 | com_err(whoami, 0, "database closed"); | |
196 | mr_setup_signals(); | |
197 | send_zgram("MOIRA", "database closed"); | |
198 | dormant = ASLEEP; | |
199 | } | |
589993be | 200 | |
85330553 | 201 | /* Block until something happens. */ |
202 | memcpy(&readfds, &xreadfds, sizeof(readfds)); | |
203 | memcpy(&writefds, &xwritefds, sizeof(writefds)); | |
9294e804 | 204 | if (select(nfds, &readfds, &writefds, NULL, &timeout) == -1) |
5eaef520 | 205 | { |
206 | if (errno != EINTR) | |
85330553 | 207 | com_err(whoami, errno, "in select"); |
5eaef520 | 208 | if (!inc_running || now - inc_started > INC_TIMEOUT) |
209 | next_incremental(); | |
210 | continue; | |
211 | } | |
85330553 | 212 | |
5eaef520 | 213 | if (takedown) |
214 | break; | |
215 | time(&now); | |
216 | if (!inc_running || now - inc_started > INC_TIMEOUT) | |
217 | next_incremental(); | |
85330553 | 218 | tardy = now - 30 * 60; |
219 | ||
220 | /* If we're asleep and we should wake up, do it */ | |
221 | if ((dormant == ASLEEP) && (stat(MOIRA_MOTD_FILE, &stbuf) == -1) && | |
222 | (errno == ENOENT)) | |
223 | { | |
224 | mr_open_database(); | |
225 | com_err(whoami, 0, "database open"); | |
226 | mr_setup_signals(); | |
227 | send_zgram("MOIRA", "database open again"); | |
228 | dormant = AWAKE; | |
229 | } | |
5eaef520 | 230 | |
85330553 | 231 | /* Handle any new connections */ |
232 | if (FD_ISSET(listener, &readfds)) | |
5eaef520 | 233 | { |
8691463b | 234 | int newconn, addrlen = sizeof(struct sockaddr_in); |
85330553 | 235 | struct sockaddr_in addr; |
236 | client *cp; | |
237 | ||
8691463b | 238 | newconn = accept(listener, (struct sockaddr *)&addr, &addrlen); |
85330553 | 239 | if (newconn == -1) |
240 | com_err(whoami, errno, "accepting new connection"); | |
241 | else if (newconn > 0) | |
5eaef520 | 242 | { |
85330553 | 243 | if (newconn + 1 > nfds) |
244 | nfds = newconn + 1; | |
245 | FD_SET(newconn, &xreadfds); | |
246 | ||
247 | /* Add a new client to the array */ | |
248 | nclients++; | |
249 | if (nclients > clientssize) | |
5eaef520 | 250 | { |
85330553 | 251 | clientssize = 2 * clientssize; |
252 | clients = xrealloc(clients, clientssize * sizeof(client *)); | |
0fa91a0a | 253 | } |
85330553 | 254 | |
255 | clients[nclients - 1] = cp = xmalloc(sizeof(client)); | |
256 | memset(cp, 0, sizeof(client)); | |
257 | cp->con = newconn; | |
258 | cp->id = counter++; | |
259 | cp->last_time_used = now; | |
260 | cp->haddr = addr; | |
261 | cp->tuplessize = 1; | |
262 | cp->tuples = xmalloc(sizeof(mr_params)); | |
263 | memset(cp->tuples, 0, sizeof(mr_params)); | |
8691463b | 264 | cp->state = CL_ACCEPTING; |
c44ddfa7 | 265 | cp->version = 2; |
85330553 | 266 | |
267 | cur_client = cp; | |
268 | com_err(whoami, 0, | |
269 | "New connection from %s port %d (now %d client%s)", | |
270 | inet_ntoa(cp->haddr.sin_addr), | |
271 | (int)ntohs(cp->haddr.sin_port), | |
272 | nclients, nclients != 1 ? "s" : ""); | |
5eaef520 | 273 | } |
0fa91a0a | 274 | } |
5eaef520 | 275 | |
85330553 | 276 | /* Handle any existing connections. */ |
5eaef520 | 277 | for (i = 0; i < nclients; i++) |
278 | { | |
279 | cur_client = clients[i]; | |
85330553 | 280 | |
281 | if (FD_ISSET(clients[i]->con, &writefds)) | |
282 | { | |
283 | client_write(clients[i]); | |
284 | if (!clients[i]->ntuples) | |
285 | { | |
286 | FD_CLR(clients[i]->con, &xwritefds); | |
85330553 | 287 | FD_SET(clients[i]->con, &xreadfds); |
288 | } | |
289 | clients[i]->last_time_used = now; | |
290 | } | |
291 | ||
292 | if (FD_ISSET(clients[i]->con, &readfds)) | |
5eaef520 | 293 | { |
8691463b | 294 | if (clients[i]->state == CL_ACCEPTING) |
295 | { | |
296 | switch(mr_cont_accept(clients[i]->con, | |
297 | &clients[i]->hsbuf, | |
298 | &clients[i]->hslen)) | |
299 | { | |
300 | case -1: | |
301 | break; | |
302 | ||
303 | case 0: | |
304 | clients[i]->state = CL_CLOSING; | |
305 | break; | |
306 | ||
307 | default: | |
308 | clients[i]->state = CL_ACTIVE; | |
309 | clients[i]->hsbuf = NULL; | |
310 | break; | |
311 | } | |
312 | } | |
313 | else | |
314 | { | |
315 | client_read(clients[i]); | |
316 | if (clients[i]->ntuples) | |
317 | { | |
318 | FD_CLR(clients[i]->con, &xreadfds); | |
319 | FD_SET(clients[i]->con, &xwritefds); | |
320 | } | |
321 | clients[i]->last_time_used = now; | |
322 | } | |
5eaef520 | 323 | } |
85330553 | 324 | |
325 | if (clients[i]->last_time_used < tardy) | |
5eaef520 | 326 | { |
327 | com_err(whoami, 0, "Shutting down connection due to inactivity"); | |
8691463b | 328 | clients[i]->state = CL_CLOSING; |
85330553 | 329 | } |
330 | ||
8691463b | 331 | if (clients[i]->state == CL_CLOSING) |
85330553 | 332 | { |
333 | client *old; | |
334 | ||
335 | com_err(whoami, 0, "Closed connection (now %d client%s, " | |
336 | "%d queries)", nclients - 1, nclients != 2 ? "s" : "", | |
337 | newqueries); | |
338 | ||
339 | shutdown(clients[i]->con, 2); | |
340 | close(clients[i]->con); | |
341 | FD_CLR(clients[i]->con, &xreadfds); | |
342 | FD_CLR(clients[i]->con, &xwritefds); | |
92ced3ed | 343 | free_rtn_tuples(clients[i]); |
85330553 | 344 | free(clients[i]->tuples); |
8691463b | 345 | free(clients[i]->hsbuf); |
85330553 | 346 | old = clients[i]; |
347 | clients[i] = clients[--nclients]; | |
348 | free(old); | |
5eaef520 | 349 | } |
85330553 | 350 | |
5eaef520 | 351 | cur_client = NULL; |
352 | if (takedown) | |
353 | break; | |
354 | } | |
355 | } | |
85330553 | 356 | |
5eaef520 | 357 | com_err(whoami, 0, "%s", takedown); |
358 | if (dormant != ASLEEP) | |
359 | mr_close_database(); | |
360 | send_zgram("MOIRA", takedown); | |
361 | return 0; | |
70d54e43 | 362 | } |
363 | ||
5eaef520 | 364 | void reapchild(int x) |
554776b1 | 365 | { |
5eaef520 | 366 | int status, pid; |
367 | ||
368 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) | |
369 | { | |
370 | if (pid == inc_pid) | |
371 | inc_running = 0; | |
372 | if (!takedown && (WTERMSIG(status) != 0 || WEXITSTATUS(status) != 0)) | |
71c89283 | 373 | { |
e4342467 | 374 | critical_alert("moirad", "%d: child exits with signal %d status %d", |
71c89283 | 375 | pid, WTERMSIG(status), WEXITSTATUS(status)); |
376 | } | |
554776b1 | 377 | } |
378 | } | |
589993be | 379 | |
380 | ||
5eaef520 | 381 | void godormant(int x) |
589993be | 382 | { |
5eaef520 | 383 | switch (dormant) |
384 | { | |
589993be | 385 | case AWAKE: |
386 | case GROGGY: | |
5eaef520 | 387 | com_err(whoami, 0, "requested to go dormant"); |
388 | break; | |
589993be | 389 | case ASLEEP: |
5eaef520 | 390 | com_err(whoami, 0, "already asleep"); |
391 | break; | |
589993be | 392 | case SLEEPY: |
5eaef520 | 393 | break; |
589993be | 394 | } |
5eaef520 | 395 | dormant = SLEEPY; |
589993be | 396 | } |
397 | ||
398 | ||
5eaef520 | 399 | void gowakeup(int x) |
589993be | 400 | { |
5eaef520 | 401 | switch (dormant) |
402 | { | |
589993be | 403 | case ASLEEP: |
404 | case SLEEPY: | |
5eaef520 | 405 | com_err(whoami, 0, "Good morning"); |
406 | break; | |
589993be | 407 | case AWAKE: |
5eaef520 | 408 | com_err(whoami, 0, "already awake"); |
409 | break; | |
589993be | 410 | case GROGGY: |
5eaef520 | 411 | break; |
589993be | 412 | } |
5eaef520 | 413 | dormant = GROGGY; |
589993be | 414 | } |
083a6e94 | 415 | |
5eaef520 | 416 | |
03c05291 | 417 | void mr_setup_signals(void) |
083a6e94 | 418 | { |
5eaef520 | 419 | struct sigaction action; |
420 | ||
421 | action.sa_flags = 0; | |
422 | sigemptyset(&action.sa_mask); | |
03c05291 | 423 | |
5eaef520 | 424 | /* There should probably be a few more of these. */ |
03c05291 | 425 | |
5eaef520 | 426 | action.sa_handler = sigshut; |
427 | if ((sigaction(SIGTERM, &action, NULL) < 0) || | |
428 | (sigaction(SIGINT, &action, NULL) < 0) || | |
429 | (sigaction(SIGHUP, &action, NULL) < 0)) | |
430 | { | |
03c05291 | 431 | com_err(whoami, errno, "Unable to establish signal handlers."); |
432 | exit(1); | |
083a6e94 | 433 | } |
e448f08d | 434 | |
5eaef520 | 435 | action.sa_handler = godormant; |
436 | if (sigaction(SIGUSR1, &action, NULL) < 0) | |
437 | { | |
03c05291 | 438 | com_err(whoami, errno, "Unable to establish signal handlers."); |
439 | exit(1); | |
440 | } | |
e448f08d | 441 | |
5eaef520 | 442 | action.sa_handler = gowakeup; |
443 | if (sigaction(SIGUSR2, &action, NULL) < 0) | |
444 | { | |
03c05291 | 445 | com_err(whoami, errno, "Unable to establish signal handlers."); |
446 | exit(1); | |
447 | } | |
e448f08d | 448 | |
44762a3f | 449 | action.sa_handler = SIG_IGN; |
450 | if (sigaction(SIGPIPE, &action, NULL) < 0) | |
451 | { | |
452 | com_err(whoami, errno, "Unable to establish signal handlers."); | |
453 | exit(1); | |
454 | } | |
455 | ||
5eaef520 | 456 | action.sa_handler = reapchild; |
457 | sigaddset(&action.sa_mask, SIGCHLD); | |
458 | if (sigaction(SIGCHLD, &action, NULL) < 0) | |
459 | { | |
03c05291 | 460 | com_err(whoami, errno, "Unable to establish signal handlers."); |
461 | exit(1); | |
462 | } | |
463 | } |