fix the plm database tool
[paraslash.git] / server.c
1 /*
2 * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file server.c Paraslash's main server */
20
21
22 /** \mainpage Paraslash API Reference
23 *
24 * Good starting points for reading are probably \ref dbtool, \ref sender,
25 * \ref receiver, \ref receiver_node, \ref filter, \ref filter_node.
26 *
27 */
28
29
30
31 #include "server.cmdline.h"
32 #include "db.h"
33 #include "server.h"
34 #include "afs.h"
35 #include "config.h"
36 #include "close_on_fork.h"
37 #include <sys/mman.h> /* MAP_SHARED, PROT_READ, PROT_WRITE */
38 #include "send.h"
39 #include "error.h"
40 #include "net.h"
41 #include "daemon.h"
42 #include "string.h"
43
44 /** define the array of error lists needed by para_server */
45 INIT_SERVER_ERRLISTS;
46
47 /** shut down non-authorized connections after that many seconds */
48 #define ALARM_TIMEOUT 10
49
50 /* these are exported to afs/command/dbtool */
51 struct misc_meta_data *mmd;
52 /** the configuration of para_server
53 *
54 * It also contains the options for all database tools and all supported
55 * senders.
56 */
57 struct gengetopt_args_info conf;
58 char *user_list = NULL;
59 extern void http_send_init(struct sender *);
60 extern void ortp_send_init(struct sender *);
61 extern struct audio_format afl[];
62
63 /** the list of supported database tools */
64 struct dbtool dblist[] = {
65 {
66 .name = "random",
67 .init = random_dbtool_init,
68 .update_audio_file = NULL,
69 },
70 {
71 .name = "plm",
72 .init = plm_dbtool_init,
73 .update_audio_file = NULL,
74 .pre_select = NULL,
75 .post_select = NULL,
76 },
77 #ifdef HAVE_MYSQL
78 {
79 .name = "mysql",
80 .init = mysql_dbtool_init,
81 .update_audio_file = NULL,
82 .pre_select = NULL,
83 .post_select = NULL,
84 },
85 #endif
86 {
87 .name = NULL,
88 }
89 };
90
91 /** the list of supported senders */
92 struct sender senders[] = {
93 {
94 .name = "http",
95 .init = http_send_init,
96 },
97 #ifdef HAVE_ORTP
98 {
99 .name = "ortp",
100 .init = ortp_send_init,
101 },
102 #endif
103 {
104 .name = NULL,
105 }
106 };
107
108
109 /* global variables for server-internal use */
110 static FILE *logfile;
111 static int mmd_semid;
112 static int signal_pipe;
113
114 /**
115 * para_server's log function
116 *
117 * \param ll the log level
118 * \param fmt the format string describing the log message
119 */
120 void para_log(int ll, char* fmt,...)
121 {
122 va_list argp;
123 FILE *outfd;
124 struct tm *tm;
125 time_t t1;
126 char str[MAXLINE] = "";
127 pid_t mypid;
128
129 if (ll < conf.loglevel_arg)
130 return;
131 if (!logfile) {
132 if (ll < WARNING)
133 outfd = stdout;
134 else
135 outfd = stderr;
136 } else
137 outfd = logfile;
138 if (conf.daemon_given && !logfile)
139 return;
140 time(&t1);
141 tm = localtime(&t1);
142 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
143 fprintf(outfd, "%s ", str);
144 if (conf.loglevel_arg <= INFO)
145 fprintf(outfd, "%i: ", ll);
146 mypid = getpid();
147 if (conf.loglevel_arg <= INFO)
148 fprintf(outfd, "(%d) ", mypid);
149 va_start(argp, fmt);
150 vfprintf(outfd, fmt, argp);
151 va_end(argp);
152 }
153
154
155 /*
156 * setup shared memory area and get semaphore for locking
157 */
158 static void shm_init(void)
159 {
160 int fd;
161 caddr_t area;
162
163 if ((fd = open("/dev/zero", O_RDWR)) < 0) {
164 PARA_EMERG_LOG("%s", "failed to open /dev/zero\n");
165 exit(EXIT_FAILURE);
166 }
167 if ((area = mmap(0, sizeof(struct misc_meta_data),
168 PROT_READ | PROT_WRITE,
169 MAP_SHARED, fd, 0)) == (caddr_t) - 1) {
170 PARA_EMERG_LOG("%s", "mmap error\n");
171 exit(EXIT_FAILURE);
172 }
173 close(fd); /* we dont need /dev/zero anymore */
174 mmd = (struct misc_meta_data *)area;
175
176 mmd->dbt_num = 0;
177 mmd->num_played = 0;
178 mmd->num_commands = 0;
179 mmd->events = 0;
180 mmd->num_connects = 0;
181 mmd->active_connections = 0;
182 strcpy(mmd->filename, "(none)");
183 mmd->audio_format = -1;
184 mmd->afs_status_flags = AFS_NEXT;
185 mmd->new_afs_status_flags = AFS_NEXT;
186 mmd->sender_cmd_data.cmd_num = -1;
187
188 mmd_semid = semget(42, 1, IPC_CREAT | 0666);
189 if (mmd_semid == -1) {
190 PARA_EMERG_LOG("%s", "semget failed\n");
191 exit(EXIT_FAILURE);
192 }
193 }
194
195 static void do_semop(struct sembuf *sops, int num)
196 {
197 if (semop(mmd_semid, sops, num) >= 0)
198 return;
199 PARA_WARNING_LOG("semop failed (%s), retrying\n", strerror(errno));
200 while (semop(mmd_semid, sops, num) < 0)
201 ; /* nothing */
202 }
203
204 /**
205 * lock the shared memory area containing the mmd struct
206 *
207 * \sa semop(2), struct misc_meta_data
208 */
209 void mmd_lock(void)
210 {
211 struct sembuf sops[2] = {
212 {
213 .sem_num = 0,
214 .sem_op = 0,
215 .sem_flg = SEM_UNDO
216 },
217 {
218 .sem_num = 0,
219 .sem_op = 1,
220 .sem_flg = SEM_UNDO
221 }
222 };
223 do_semop(sops, 2);
224 }
225
226 /**
227 * unlock the shared memory area containing the mmd struct
228 *
229 * \sa semop(2), struct misc_meta_data
230 */
231 void mmd_unlock(void)
232 {
233 struct sembuf sops[1] = {
234 {
235 .sem_num = 0,
236 .sem_op = -1,
237 .sem_flg = SEM_UNDO
238 },
239 };
240 do_semop(sops, 1);
241 }
242
243 static void parse_config(int override)
244 {
245 char *home = para_homedir();
246 struct stat statbuf;
247 int ret;
248 char *cf;
249
250 if (conf.config_file_given)
251 cf = conf.config_file_arg;
252 else
253 cf = make_message("%s/.paraslash/server.conf", home);
254 free(user_list);
255 if (!conf.user_list_given)
256 user_list = make_message("%s/.paraslash/server.users", home);
257 else
258 user_list = para_strdup(conf.user_list_arg);
259 ret = stat(cf, &statbuf);
260 if (ret && conf.config_file_given) {
261 ret = -1;
262 PARA_EMERG_LOG("can not stat config file %s\n", cf);
263 goto out;
264 }
265 if (!ret) {
266 int tmp = conf.daemon_given;
267 cmdline_parser_configfile(cf, &conf, override, 0, 0);
268 conf.daemon_given = tmp;
269 }
270 /* logfile */
271 if (!conf.logfile_given && conf.daemon_given) {
272 ret = -1;
273 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
274 goto out;
275 }
276 if (conf.logfile_given)
277 logfile = open_log(conf.logfile_arg);
278 ret = 1;
279 out:
280 free(cf);
281 free(home);
282 if (ret > 0)
283 return;
284 free(user_list);
285 user_list = NULL;
286 exit(EXIT_FAILURE);
287 }
288
289 static void setup_signal_handling(void)
290 {
291 int ret = 0;
292
293 signal_pipe = para_signal_init();
294 // fcntl(signal_pipe, F_SETFL, O_NONBLOCK);
295 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
296 ret += para_install_sighandler(SIGINT);
297 ret += para_install_sighandler(SIGTERM);
298 ret += para_install_sighandler(SIGHUP);
299 ret += para_install_sighandler(SIGCHLD);
300 ret += para_install_sighandler(SIGUSR1);
301 signal(SIGPIPE, SIG_IGN);
302 if (ret != 5) {
303 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
304 exit(EXIT_FAILURE);
305 }
306 }
307
308 static void init_dbtool(void)
309 {
310 int i;
311
312 mmd->dbt_change = -1; /* no change nec., set to new dbt num by com_cdt */
313 if (!dblist[1].name)
314 goto random;
315 if (conf.dbtool_given) {
316 for (i = 0; dblist[i].name; i++) {
317 if (strcmp(dblist[i].name, conf.dbtool_arg))
318 continue;
319 PARA_NOTICE_LOG("initializing %s database tool\n",
320 dblist[i].name);
321 if (dblist[i].init(&dblist[i]) < 0) {
322 PARA_WARNING_LOG("init %s failed",
323 dblist[i].name);
324 goto random;
325 }
326 mmd->dbt_num = i;
327 return;
328 }
329 PARA_WARNING_LOG("%s", "no such dbtool, switching to random\n");
330 goto random;
331 }
332 /* use the first dbtool that works
333 * (assuming that random always works)
334 */
335 for (i = 1; dblist[i].name; i++) {
336 int ret = dblist[i].init(&dblist[i]);
337 if (ret >= 0) {
338 PARA_INFO_LOG("initialized %s\n", dblist[i].name);
339 mmd->dbt_num = i;
340 return;
341 }
342 PARA_CRIT_LOG("%s init failed: %s\n", dblist[i].name,
343 PARA_STRERROR(-ret));
344 }
345 random:
346 mmd->dbt_num = 0;
347 dblist[0].init(&dblist[0]); /* always successful */
348 }
349
350 static unsigned init_network(void)
351 {
352 int sockfd = init_tcp_socket(conf.port_arg);
353
354 if (sockfd < 0)
355 exit(EXIT_FAILURE);
356 return sockfd;
357 }
358
359 static void init_random_seed(void)
360 {
361 int fd, ret = -1, len = sizeof(unsigned int);
362 unsigned int seed;
363
364 fd = open("/dev/random", O_RDONLY);
365 if (fd < 0)
366 goto out;
367 ret = -2;
368 if (read(fd, &seed, len) != len)
369 goto out;
370 srandom(seed);
371 ret = 1;
372 out:
373 if (fd >= 0)
374 close(fd);
375 if (ret > 0)
376 return;
377 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
378 ret);
379 exit(EXIT_FAILURE);
380 }
381
382 static unsigned do_inits(int argc, char **argv)
383 {
384 /* connector's address information */
385 int sockfd;
386
387 init_random_seed();
388 /* parse command line options */
389 cmdline_parser(argc, argv, &conf);
390 para_drop_privileges(conf.user_arg);
391 /* parse config file, open log and set defaults */
392 parse_config(0);
393 log_welcome("para_server", conf.loglevel_arg);
394 shm_init(); /* init mmd struct */
395 server_uptime(UPTIME_SET); /* reset server uptime */
396 /* become daemon */
397 if (conf.daemon_given)
398 daemon_init();
399 init_dbtool();
400 PARA_NOTICE_LOG("%s", "initializing audio file sender\n");
401 /* audio file sender */
402 afs_init();
403 mmd->server_pid = getpid();
404 setup_signal_handling();
405 mmd_lock();
406 /* init network socket */
407 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
408 sockfd = init_network();
409 if (conf.autoplay_given) {
410 mmd->afs_status_flags |= AFS_PLAYING;
411 mmd->new_afs_status_flags |= AFS_PLAYING;
412 }
413 PARA_NOTICE_LOG("%s", "init complete\n");
414 return sockfd;
415 }
416
417 static void handle_dbt_change(void)
418 {
419 int ret, old = mmd->dbt_num, new = mmd->dbt_change;
420
421 dblist[old].shutdown();
422 ret = dblist[new].init(&dblist[new]);
423 mmd->dbt_change = -1; /* reset */
424 if (ret >= 0) {
425 mmd->dbt_num = new;
426 return;
427 }
428 /* init failed */
429 PARA_ERROR_LOG("%s -- switching to the random dbtool\n", PARA_STRERROR(-ret));
430 dblist[0].init(&dblist[0]);
431 mmd->dbt_num = 0;
432 }
433
434 /*
435 * called when server gets SIGHUP or when client invokes hup command.
436 */
437 static void handle_sighup(void)
438 {
439 PARA_NOTICE_LOG("%s", "SIGHUP\n");
440 close_log(logfile); /* gets reopened if necessary by parse_config */
441 logfile = NULL;
442 parse_config(1); /* reopens log */
443 mmd->dbt_change = mmd->dbt_num; /* do not change dbtool */
444 handle_dbt_change(); /* force reloading dbtool */
445 }
446
447 static void status_refresh(void)
448 {
449 static int prev_uptime = -1, prev_events = -1;
450 int uptime = server_uptime(UPTIME_GET), ret = 1;
451
452 if (prev_events != mmd->events)
453 goto out;
454 if (mmd->new_afs_status_flags != mmd->afs_status_flags)
455 goto out;
456 if (uptime / 60 != prev_uptime / 60)
457 goto out;
458 ret = 0;
459 out:
460 prev_uptime = uptime;
461 prev_events = mmd->events;
462 mmd->afs_status_flags = mmd->new_afs_status_flags;
463 if (ret) {
464 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
465 mmd->events, mmd->audio_format);
466 killpg(0, SIGUSR1);
467 }
468 }
469
470 /*
471 * MAIN
472 */
473 int main(int argc, char *argv[])
474 {
475 /* listen on sock_fd, new connection on new_fd */
476 int sockfd, new_fd;
477 struct sockaddr_in their_addr;
478 int err, i, max_fileno, ret;
479 pid_t chld_pid;
480 fd_set rfds, wfds;
481 struct timeval *timeout;
482
483 valid_fd_012();
484 sockfd = do_inits(argc, argv);
485 repeat:
486 /* check socket and signal pipe in any case */
487 FD_ZERO(&rfds);
488 FD_ZERO(&wfds);
489 FD_SET(sockfd, &rfds);
490 max_fileno = sockfd;
491 FD_SET(signal_pipe, &rfds);
492 max_fileno = MAX(max_fileno, signal_pipe);
493
494 timeout = afs_preselect();
495 status_refresh();
496 for (i = 0; senders[i].name; i++) {
497 if (senders[i].status != SENDER_ON)
498 continue;
499 if (!senders[i].pre_select)
500 continue;
501 senders[i].pre_select(mmd->audio_format >= 0?
502 &afl[mmd->audio_format] : NULL,
503 &max_fileno,
504 &rfds, &wfds);
505 }
506 if (dblist[mmd->dbt_num].pre_select) {
507 ret = dblist[mmd->dbt_num].pre_select(&rfds, &wfds);
508 max_fileno = MAX(max_fileno, ret);
509 }
510 mmd_unlock();
511 // PARA_DEBUG_LOG("%s: select (max = %i)\n", __func__, max_fileno);
512 ret = select(max_fileno + 1, &rfds, &wfds, NULL, timeout);
513 err = errno;
514 //PARA_DEBUG_LOG("%s: select returned %i\n", __func__, ret);
515 mmd_lock();
516 if (mmd->dbt_change >= 0)
517 handle_dbt_change();
518 if (dblist[mmd->dbt_num].post_select)
519 dblist[mmd->dbt_num].post_select(&rfds, &wfds);
520 if (ret < 0 && err == EINTR)
521 goto repeat;
522 if (ret < 0) {
523 PARA_CRIT_LOG("select error (%s)\n", strerror(err));
524 goto repeat;
525 }
526 for (i = 0; senders[i].name; i++) {
527 if (senders[i].status != SENDER_ON)
528 continue;
529 if (!senders[i].post_select)
530 continue;
531 senders[i].post_select(mmd->audio_format >= 0?
532 &afl[mmd->audio_format] : NULL,
533 &rfds, &wfds);
534 }
535 if (!ret) {
536 afs_send_chunk();
537 status_refresh();
538 }
539 if (FD_ISSET(signal_pipe, &rfds)) {
540 int sig;
541 sig = para_next_signal();
542 switch (sig) {
543 case SIGHUP:
544 handle_sighup();
545 break;
546 case SIGCHLD:
547 para_reap_children();
548 break;
549 /* die on sigint/sigterm. Kill all children too. */
550 case SIGINT:
551 case SIGTERM:
552 PARA_EMERG_LOG("terminating on signal %d\n", sig);
553 kill(0, SIGTERM);
554 exit(EXIT_FAILURE);
555 }
556 }
557 if (mmd->sender_cmd_data.cmd_num >= 0) {
558 int num = mmd->sender_cmd_data.cmd_num,
559 s = mmd->sender_cmd_data.sender_num;
560
561 if (senders[s].client_cmds[num])
562 senders[s].client_cmds[num](&mmd->sender_cmd_data);
563 mmd->sender_cmd_data.cmd_num = -1;
564 }
565 if (!FD_ISSET(sockfd, &rfds))
566 goto repeat;
567
568 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
569 if (new_fd < 0)
570 goto repeat;
571 PARA_INFO_LOG("got connection from %s, forking\n",
572 inet_ntoa(their_addr.sin_addr));
573 mmd->num_connects++;
574 mmd->active_connections++;
575 random();
576 chld_pid = fork();
577 if (chld_pid < 0) {
578 PARA_CRIT_LOG("%s", "fork failed\n");
579 goto repeat;
580 }
581 if (chld_pid) {
582 close(new_fd);
583 /* parent keeps accepting connections */
584 goto repeat;
585 }
586 alarm(ALARM_TIMEOUT);
587 close_listed_fds();
588 close(sockfd); /* child doesn't need the listener */
589 /*
590 * put info on who we are serving into argv[0] to make
591 * client ip visible in top/ps
592 */
593 for (i = argc - 1; i >= 0; i--)
594 memset(argv[i], 0, strlen(argv[i]));
595 sprintf(argv[0], "para_server (serving %s)",
596 inet_ntoa(their_addr.sin_addr));
597 return handle_connect(new_fd, &their_addr);
598 }