Don't use depricated xxx_cmdline_parser_configfile().
[paraslash.git] / server.c
1 /*
2 * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file server.c Paraslash's main server */
8
9
10 /** \mainpage Paraslash API Reference
11 *
12 * Good starting points for reading are probably \ref audio_file_selector,
13 * \ref sender, \ref receiver, \ref receiver_node, \ref filter, \ref
14 * filter_node.
15 *
16 */
17
18
19
20 #include "server.cmdline.h"
21 #include "afs.h"
22 #include "server.h"
23 #include "vss.h"
24 #include "config.h"
25 #include "close_on_fork.h"
26 #include "send.h"
27 #include "error.h"
28 #include "net.h"
29 #include "daemon.h"
30 #include "string.h"
31 #include "ipc.h"
32 #include "fd.h"
33 #include "signal.h"
34 #include "user_list.h"
35
36 /** define the array of error lists needed by para_server */
37 INIT_SERVER_ERRLISTS;
38
39 /** shut down non-authorized connections after that many seconds */
40 #define ALARM_TIMEOUT 10
41
42 /**
43 * pointer to shared memory area for communication between para_server
44 * and its children. exported to vss.c. command.c and to all selectors.
45 */
46 struct misc_meta_data *mmd;
47
48 /**
49 * the configuration of para_server
50 *
51 * It also contains the options for all audio file selectors, audio format handler
52 * and all supported senders.
53 */
54 struct server_args_info conf;
55
56 /** the file containing user information (public key, permissions) */
57 char *user_list_file = NULL;
58
59 extern void dccp_send_init(struct sender *);
60 extern void http_send_init(struct sender *);
61 extern void ortp_send_init(struct sender *);
62
63 /* TODO: This is better handled by autoconf */
64 /** the list of supported audio file selectors */
65 struct audio_file_selector selectors[] = {
66 {
67 .name = "random",
68 .init = random_selector_init,
69 .update_audio_file = NULL,
70 },
71 {
72 .name = "playlist",
73 .init = playlist_selector_init,
74 .update_audio_file = NULL,
75 .pre_select = NULL,
76 .post_select = NULL,
77 },
78 #ifdef HAVE_MYSQL
79 {
80 .name = "mysql",
81 .init = mysql_selector_init,
82 .update_audio_file = NULL,
83 .pre_select = NULL,
84 .post_select = NULL,
85 },
86 #endif
87 {
88 .name = NULL,
89 }
90 };
91
92 /** the list of supported senders */
93 struct sender senders[] = {
94 {
95 .name = "http",
96 .init = http_send_init,
97 },
98 {
99 .name = "dccp",
100 .init = dccp_send_init,
101 },
102 #ifdef HAVE_ORTP
103 {
104 .name = "ortp",
105 .init = ortp_send_init,
106 },
107 #endif
108 {
109 .name = NULL,
110 }
111 };
112
113
114 /* global variables for server-internal use */
115 static FILE *logfile;
116 static int mmd_mutex, mmd_shm_id;
117 static int signal_pipe;
118
119 /**
120 * para_server's log function
121 *
122 * \param ll the log level
123 * \param fmt the format string describing the log message
124 */
125 void para_log(int ll, const char* fmt,...)
126 {
127 va_list argp;
128 FILE *outfd;
129 struct tm *tm;
130 time_t t1;
131 char str[MAXLINE] = "";
132 pid_t mypid;
133
134 if (ll < conf.loglevel_arg)
135 return;
136 outfd = logfile? logfile : stderr;
137 time(&t1);
138 tm = localtime(&t1);
139 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
140 fprintf(outfd, "%s ", str);
141 if (conf.loglevel_arg <= INFO)
142 fprintf(outfd, "%i: ", ll);
143 mypid = getpid();
144 if (conf.loglevel_arg <= INFO)
145 fprintf(outfd, "(%d) ", mypid);
146 va_start(argp, fmt);
147 vfprintf(outfd, fmt, argp);
148 va_end(argp);
149 }
150
151 /*
152 * setup shared memory area and get mutex for locking
153 */
154 static void shm_init(void)
155 {
156 void *shm;
157 int ret = shm_new(sizeof(struct misc_meta_data));
158
159 if (ret < 0)
160 goto err_out;
161
162 ret = shm_attach(ret, ATTACH_RW, &shm);
163 if (ret < 0)
164 goto err_out;
165 mmd = shm;
166 mmd_shm_id = ret;
167
168 ret = mutex_new();
169 if (ret < 0)
170 goto err_out;
171 mmd_mutex = ret;
172
173 mmd->selector_num = 0;
174 mmd->num_played = 0;
175 mmd->num_commands = 0;
176 mmd->events = 0;
177 mmd->num_connects = 0;
178 mmd->active_connections = 0;
179 strcpy(mmd->filename, "(none)");
180 mmd->audio_format = -1;
181 mmd->vss_status_flags = VSS_NEXT;
182 mmd->new_vss_status_flags = VSS_NEXT;
183 mmd->sender_cmd_data.cmd_num = -1;
184 return;
185 err_out:
186 PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
187 exit(EXIT_FAILURE);
188 }
189
190 /**
191 * lock the shared memory area containing the mmd struct
192 *
193 * \sa semop(2), struct misc_meta_data
194 */
195 void mmd_lock(void)
196 {
197 mutex_lock(mmd_mutex);
198 }
199
200 /**
201 * unlock the shared memory area containing the mmd struct
202 *
203 * \sa semop(2), struct misc_meta_data
204 */
205
206 void mmd_unlock(void)
207 {
208 mutex_unlock(mmd_mutex);
209 }
210
211 static void parse_config(int override)
212 {
213 char *home = para_homedir();
214 struct stat statbuf;
215 int ret;
216 char *cf;
217
218 if (conf.config_file_given)
219 cf = conf.config_file_arg;
220 else
221 cf = make_message("%s/.paraslash/server.conf", home);
222 free(user_list_file);
223 if (!conf.user_list_given)
224 user_list_file = make_message("%s/.paraslash/server.users", home);
225 else
226 user_list_file = para_strdup(conf.user_list_arg);
227 ret = stat(cf, &statbuf);
228 if (ret && conf.config_file_given) {
229 ret = -1;
230 PARA_EMERG_LOG("can not stat config file %s\n", cf);
231 goto out;
232 }
233 if (!ret) {
234 int tmp = conf.daemon_given;
235 struct server_cmdline_parser_params params = {
236 .override = override,
237 .initialize = 0,
238 .check_required = 0,
239 .check_ambiguity = 0
240 };
241 server_cmdline_parser_config_file(cf, &conf, &params);
242 conf.daemon_given = tmp;
243 }
244 /* logfile */
245 if (!conf.logfile_given && conf.daemon_given) {
246 ret = -1;
247 PARA_EMERG_LOG("%s", "daemon, but no log file\n");
248 goto out;
249 }
250 if (conf.logfile_given)
251 logfile = open_log(conf.logfile_arg);
252 ret = 1;
253 out:
254 free(cf);
255 free(home);
256 if (ret > 0)
257 return;
258 free(user_list_file);
259 user_list_file = NULL;
260 exit(EXIT_FAILURE);
261 }
262
263 static void setup_signal_handling(void)
264 {
265 int ret = 0;
266
267 signal_pipe = para_signal_init();
268 PARA_NOTICE_LOG("%s", "setting up signal handlers\n");
269 ret += para_install_sighandler(SIGINT);
270 ret += para_install_sighandler(SIGTERM);
271 ret += para_install_sighandler(SIGHUP);
272 ret += para_install_sighandler(SIGCHLD);
273 ret += para_install_sighandler(SIGUSR1);
274 signal(SIGPIPE, SIG_IGN);
275 if (ret != 5) {
276 PARA_EMERG_LOG("%s", "could not install signal handlers\n");
277 exit(EXIT_FAILURE);
278 }
279 }
280
281 static void init_selector(void)
282 {
283 int i, ret;
284
285 mmd->selector_change = -1; /* no change nec., set to new num by com_chs */
286 if (!conf.selector_given)
287 goto random;
288 for (i = 0; selectors[i].name; i++) {
289 if (strcmp(selectors[i].name, conf.selector_arg))
290 continue;
291 PARA_NOTICE_LOG("initializing %s audio file selector\n",
292 selectors[i].name);
293 ret = selectors[i].init(&selectors[i]);
294 if (ret < 0) {
295 PARA_WARNING_LOG("%s", PARA_STRERROR(-ret));
296 break;
297 }
298 mmd->selector_num = i;
299 return;
300 }
301 PARA_WARNING_LOG("%s", "falling back to the random selector\n");
302 random:
303 mmd->selector_num = 0;
304 selectors[0].init(&selectors[0]); /* always successful */
305 }
306
307 static unsigned init_network(void)
308 {
309 int fd, ret = init_tcp_socket(conf.port_arg);
310
311 if (ret < 0)
312 goto err;
313 fd = ret;
314 ret = mark_fd_nonblock(fd);
315 if (ret < 0)
316 goto err;
317 return fd;
318 err:
319 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
320 exit(EXIT_FAILURE);
321 }
322
323 static void init_random_seed(void)
324 {
325 int fd, ret = -1;
326 unsigned int seed;
327 size_t len = sizeof(unsigned int);
328
329 fd = open("/dev/urandom", O_RDONLY);
330 if (fd < 0)
331 goto out;
332 ret = -2;
333 if (read(fd, &seed, len) != len)
334 goto out;
335 srandom(seed);
336 ret = 1;
337 out:
338 if (fd >= 0)
339 close(fd);
340 if (ret > 0)
341 return;
342 PARA_EMERG_LOG("can not seed pseudo random generator (ret = %d)\n",
343 ret);
344 exit(EXIT_FAILURE);
345 }
346
347 static unsigned do_inits(int argc, char **argv)
348 {
349 /* connector's address information */
350 int sockfd;
351
352 init_random_seed();
353 /* parse command line options */
354 server_cmdline_parser(argc, argv, &conf);
355 HANDLE_VERSION_FLAG("server", conf);
356 para_drop_privileges(conf.user_arg, conf.group_arg);
357 /* parse config file, open log and set defaults */
358 parse_config(0);
359 log_welcome("para_server", conf.loglevel_arg);
360 shm_init(); /* init mmd struct */
361 server_uptime(UPTIME_SET); /* reset server uptime */
362 init_user_list(user_list_file);
363 /* become daemon */
364 if (conf.daemon_given)
365 daemon_init();
366 init_selector();
367 // PARA_ERROR_LOG("num: %d\n", mmd->selector_num);
368 PARA_NOTICE_LOG("%s", "initializing virtual streaming system\n");
369 vss_init();
370 mmd->server_pid = getpid();
371 setup_signal_handling();
372 mmd_lock();
373 /* init network socket */
374 PARA_NOTICE_LOG("%s", "initializing tcp command socket\n");
375 sockfd = init_network();
376 PARA_NOTICE_LOG("%s", "init complete\n");
377 return sockfd;
378 }
379
380 static void change_selector(void)
381 {
382 int ret, old = mmd->selector_num, new = mmd->selector_change;
383
384 selectors[old].shutdown();
385 ret = selectors[new].init(&selectors[new]);
386 mmd->selector_change = -1; /* reset */
387 if (ret >= 0) {
388 mmd->selector_num = new;
389 return;
390 }
391 /* init failed */
392 PARA_ERROR_LOG("%s -- switching to the random selector\n", PARA_STRERROR(-ret));
393 selectors[0].init(&selectors[0]);
394 mmd->selector_num = 0;
395 }
396
397 /*
398 * called when server gets SIGHUP or when client invokes hup command.
399 */
400 static void handle_sighup(void)
401 {
402 PARA_NOTICE_LOG("%s", "SIGHUP\n");
403 close_log(logfile); /* gets reopened if necessary by parse_config */
404 logfile = NULL;
405 parse_config(1); /* reopens log */
406 mmd->selector_change = mmd->selector_num; /* do not change selector.. */
407 change_selector(); /* .. just reload */
408 init_user_list(user_list_file); /* reload user list */
409 }
410
411 static void status_refresh(void)
412 {
413 static int prev_uptime = -1, prev_events = -1;
414 int uptime = server_uptime(UPTIME_GET), ret = 1;
415
416 if (prev_events != mmd->events)
417 goto out;
418 if (mmd->new_vss_status_flags != mmd->vss_status_flags)
419 goto out;
420 if (uptime / 60 != prev_uptime / 60)
421 goto out;
422 ret = 0;
423 out:
424 prev_uptime = uptime;
425 prev_events = mmd->events;
426 mmd->vss_status_flags = mmd->new_vss_status_flags;
427 if (ret) {
428 PARA_DEBUG_LOG("%d events, forcing status update, af = %d\n",
429 mmd->events, mmd->audio_format);
430 killpg(0, SIGUSR1);
431 }
432 }
433
434 /**
435 * the main function of para_server
436 *
437 * \param argc usual argument count
438 * \param argv usual argument vector
439 *
440 * \return EXIT_SUCCESS or EXIT_FAILURE
441 *
442 */
443 int main(int argc, char *argv[])
444 {
445 /* listen on sock_fd, new connection on new_fd */
446 int sockfd, new_fd;
447 struct sockaddr_in their_addr;
448 int i, max_fileno, ret;
449 pid_t chld_pid;
450 fd_set rfds, wfds;
451 struct timeval *timeout;
452
453 valid_fd_012();
454 sockfd = do_inits(argc, argv);
455 repeat:
456 FD_ZERO(&rfds);
457 FD_ZERO(&wfds);
458 max_fileno = -1;
459 /* check socket and signal pipe in any case */
460 para_fd_set(sockfd, &rfds, &max_fileno);
461 para_fd_set(signal_pipe, &rfds, &max_fileno);
462 timeout = vss_preselect();
463 status_refresh();
464 for (i = 0; senders[i].name; i++) {
465 if (senders[i].status != SENDER_ON)
466 continue;
467 if (!senders[i].pre_select)
468 continue;
469 senders[i].pre_select( &max_fileno, &rfds, &wfds);
470 }
471 if (selectors[mmd->selector_num].pre_select) {
472 ret = selectors[mmd->selector_num].pre_select(&rfds, &wfds);
473 max_fileno = PARA_MAX(max_fileno, ret);
474 }
475 mmd_unlock();
476 ret = para_select(max_fileno + 1, &rfds, &wfds, timeout);
477 mmd_lock();
478 if (mmd->selector_change >= 0)
479 change_selector();
480 if (selectors[mmd->selector_num].post_select)
481 selectors[mmd->selector_num].post_select(&rfds, &wfds);
482 if (ret < 0)
483 goto repeat;
484 for (i = 0; senders[i].name; i++) {
485 if (senders[i].status != SENDER_ON)
486 continue;
487 if (!senders[i].post_select)
488 continue;
489 senders[i].post_select(&rfds, &wfds);
490 }
491 vss_send_chunk();
492 status_refresh();
493 if (FD_ISSET(signal_pipe, &rfds)) {
494 int sig;
495 sig = para_next_signal();
496 switch (sig) {
497 case SIGHUP:
498 handle_sighup();
499 break;
500 case SIGCHLD:
501 para_reap_children();
502 break;
503 /* die on sigint/sigterm. Kill all children too. */
504 case SIGINT:
505 case SIGTERM:
506 PARA_EMERG_LOG("terminating on signal %d\n", sig);
507 kill(0, SIGTERM);
508 selectors[mmd->selector_num].shutdown();
509 mutex_destroy(mmd_mutex);
510 shm_detach(mmd);
511 shm_destroy(mmd_shm_id);
512 exit(EXIT_FAILURE);
513 }
514 }
515 if (mmd->sender_cmd_data.cmd_num >= 0) {
516 int num = mmd->sender_cmd_data.cmd_num,
517 s = mmd->sender_cmd_data.sender_num;
518
519 if (senders[s].client_cmds[num])
520 senders[s].client_cmds[num](&mmd->sender_cmd_data);
521 mmd->sender_cmd_data.cmd_num = -1;
522 }
523 if (!FD_ISSET(sockfd, &rfds))
524 goto repeat;
525
526 new_fd = para_accept(sockfd, &their_addr, sizeof(struct sockaddr_in));
527 if (new_fd < 0)
528 goto repeat;
529 PARA_INFO_LOG("got connection from %s, forking\n",
530 inet_ntoa(their_addr.sin_addr));
531 mmd->num_connects++;
532 mmd->active_connections++;
533 random();
534 chld_pid = fork();
535 if (chld_pid < 0) {
536 PARA_CRIT_LOG("%s", "fork failed\n");
537 goto repeat;
538 }
539 if (chld_pid) {
540 close(new_fd);
541 /* parent keeps accepting connections */
542 goto repeat;
543 }
544 alarm(ALARM_TIMEOUT);
545 close_listed_fds();
546 close(sockfd); /* child doesn't need the listener */
547 /*
548 * put info on who we are serving into argv[0] to make
549 * client ip visible in top/ps
550 */
551 for (i = argc - 1; i >= 0; i--)
552 memset(argv[i], 0, strlen(argv[i]));
553 sprintf(argv[0], "para_server (serving %s)",
554 inet_ntoa(their_addr.sin_addr));
555 return handle_connect(new_fd, &their_addr);
556 }