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