audiod: Check pointers passed to btr_get_node_start().
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c The paraslash's audio daemon. */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <signal.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "crypt.h"
15 #include "audiod.cmdline.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "recv.h"
20 #include "buffer_tree.h"
21 #include "filter.h"
22 #include "grab_client.h"
23 #include "client.cmdline.h"
24 #include "client.h"
25 #include "audiod.h"
26 #include "net.h"
27 #include "daemon.h"
28 #include "string.h"
29 #include "fd.h"
30 #include "write.h"
31 #include "write_common.h"
32 #include "signal.h"
33 #include "version.h"
34
35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
36 /** define the array of error lists needed by para_audiod */
37 INIT_AUDIOD_ERRLISTS;
38 /** define the array containing all supported audio formats */
39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
40
41 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43 /** pointer to the receiver for this audio format */
44 struct receiver *receiver;
45 /** the receiver configuration */
46 void *receiver_conf;
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_filters;
49 /** Array of filter numbers to be activated. */
50 unsigned *filter_nums;
51 /** Pointer to the array of filter configurations. */
52 void **filter_conf;
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_writers;
55 /** Array of writer numbers to be activated. */
56 int *writer_nums;
57 /** pointer to the array of writer configurations */
58 void **writer_conf;
59 /** do not start receiver/filters/writer before this time */
60 struct timeval restart_barrier;
61 };
62
63 /**
64 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65 * be associated with a receiver/filter/writer triple. This array holds all
66 * information on the status of these slots.
67 *
68 * \sa struct slot_info
69 * */
70 struct slot_info slot[MAX_STREAM_SLOTS];
71
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74 /** Whether the 'N' flag is set. */
75 VSS_STATUS_FLAG_NEXT = 1,
76 /** The 'P' flag is set. */
77 VSS_STATUS_FLAG_PLAYING = 2,
78 };
79
80 /**
81 * The scheduler instance of para_audiod.
82 *
83 * This is needed also in audiod_command.c (for the tasks command), so it can
84 * not be made static.
85 */
86 struct sched sched = {.max_fileno = 0};
87
88 /**
89 * The task for obtaining para_server's status (para_client stat).
90 *
91 * \sa struct task, struct sched.
92 */
93 struct status_task {
94 /** The associated task structure of audiod. */
95 struct task task;
96 /** Client data associated with the stat task. */
97 struct client_task *ct;
98 /** Do not restart client command until this time. */
99 struct timeval restart_barrier;
100 /** Last time we received status data from para_server. */
101 struct timeval last_status_read;
102 size_t min_iqs;
103 /** The offset value announced by para_server. */
104 int offset_seconds;
105 /** The length of the current audio file as announced by para_server. */
106 int length_seconds;
107 /** The start of the current stream from the view of para_server. */
108 struct timeval server_stream_start;
109 /** The average time deviation between para_server and para_audiod. */
110 struct timeval sa_time_diff;
111 /** Whether client time is ahead of server time. */
112 int sa_time_diff_sign;
113 /** The 'P' and the 'N' flags as announced by para_server. */
114 enum vss_status_flags vss_status;
115 /** Number of times the clock difference is to be checked. */
116 unsigned clock_diff_count;
117 /** When to start the next check for clock difference. */
118 struct timeval clock_diff_barrier;
119 /** Number of the audio format as announced by para_server. */
120 int current_audio_format_num;
121 /* The status task btrn is the child of the client task. */
122 struct btr_node *btrn;
123 };
124
125 /** The array of status items sent by para_server. */
126 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
127
128 /**
129 * the current mode of operation of which can be changed by the on/off/cycle
130 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
131 */
132 int audiod_status = AUDIOD_ON;
133
134 /**
135 * the gengetopt args_info struct that holds information on all command line
136 * arguments
137 */
138 struct audiod_args_info conf;
139
140 static char *socket_name;
141 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
142
143 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
144
145 static struct status_task status_task_struct;
146
147 /**
148 * the task that calls the status command of para_server
149 *
150 * \sa struct status_task
151 */
152 static struct status_task *stat_task = &status_task_struct;
153
154 /**
155 * the task for handling audiod commands
156 *
157 * \sa struct task, struct sched
158 */
159 struct command_task {
160 /** the local listening socket */
161 int fd;
162 /** the associated task structure */
163 struct task task;
164 };
165
166 /** iterate over all supported audio formats */
167 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
168
169 /**
170 * Get the audio format number.
171 *
172 * \param name The name of the audio format.
173 *
174 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
175 * \a name is not a supported audio format.
176 */
177 static int get_audio_format_num(const char *name)
178 {
179 int i;
180
181 while (para_isspace(*name))
182 name++;
183 FOR_EACH_AUDIO_FORMAT(i)
184 if (!strcmp(name, audio_formats[i]))
185 return i;
186 return -E_UNSUPPORTED_AUDIO_FORMAT;
187 }
188
189 static int get_matching_audio_format_nums(const char *re)
190 {
191 int i, ret;
192 regex_t preg;
193
194 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
195 if (ret < 0)
196 return ret;
197 ret = 0;
198 FOR_EACH_AUDIO_FORMAT(i)
199 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
200 ret |= (1 << i);
201 regfree(&preg);
202 return ret;
203 }
204
205 /**
206 * Compute the play time based on information of the given slot.
207 *
208 * \param slot_num The slot number (negative means: no slot).
209 *
210 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
211 * from the status items received from para_server and the start time of the
212 * (first) writer of the given slot.
213 *
214 * It has to to take into account that probably the stream was not started at
215 * the beginning of the file, that the clock between the server and the client
216 * host may differ and that playback of the stream was delayed, e.g. because
217 * the prebuffer filter is used in the filter configuration of the given slot.
218 *
219 * If no writer is active in the given slot, or \a slot_num is negative
220 * (indicating that para_audiod runs in standby mode), an approximation based
221 * only on the status items is computed and the returned string is prefixed
222 * with "~".
223 *
224 * \return A string that must be freed by the caller.
225 */
226 char *get_time_string(int slot_num)
227 {
228 int ret, seconds = 0, length;
229 struct timeval *tmp, sum, sss, /* server stream start */
230 rstime, /* receiver start time */
231 wstime, /* writer start time */
232 wtime, /* now - writer start */
233 rskip; /* receiver start - sss */
234 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
235 char *msg;
236
237 if (audiod_status == AUDIOD_OFF)
238 goto empty;
239 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
240 if (stat_task->length_seconds) /* paused */
241 return NULL;
242 goto empty; /* stopped */
243 }
244 if (audiod_status == AUDIOD_ON && !s)
245 goto empty;
246 /*
247 * Valid status items and playing, set length and tmp to the stream
248 * start. We use the slot info and fall back to the info from current
249 * status items if no slot info is available.
250 */
251 length = stat_task->length_seconds;
252 tmp = &stat_task->server_stream_start;
253 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
254 btr_get_node_start(s->wns[0].btrn, &wstime);
255 if (wstime.tv_sec != 0) { /* writer wrote something */
256 if (s->server_stream_start.tv_sec == 0) {
257 /* copy status info to slot */
258 s->server_stream_start = stat_task->server_stream_start;
259 s->offset_seconds = stat_task->offset_seconds;
260 s->seconds_total = stat_task->length_seconds;
261 }
262 length = s->seconds_total;
263 tmp = &s->server_stream_start;
264 }
265 }
266 if (stat_task->sa_time_diff_sign > 0)
267 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
268 else
269 tv_add(tmp, &stat_task->sa_time_diff, &sss);
270 if (!s || !s->wns || !s->wns[0].btrn) {
271 struct timeval diff;
272 tv_diff(now, &sss, &diff);
273 seconds = diff.tv_sec + stat_task->offset_seconds;
274 goto out;
275 }
276 tv_diff(now, &wstime, &wtime);
277 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
278 seconds = s->offset_seconds;
279 if (s->receiver_node->btrn) {
280 btr_get_node_start(s->receiver_node->btrn, &rstime);
281 ret = tv_diff(&rstime, &sss, &rskip);
282 if (ret > 0) { /* audiod was started in the middle of the stream */
283 tv_add(&wtime, &rskip, &sum);
284 seconds += sum.tv_sec;
285 } else
286 seconds += wtime.tv_sec;
287 } else
288 seconds += wtime.tv_sec;
289 out:
290 seconds = PARA_MIN(seconds, length);
291 seconds = PARA_MAX(seconds, 0);
292 msg = make_message(
293 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
294 s? "" : "~",
295 seconds / 60,
296 seconds % 60,
297 (length - seconds) / 60,
298 (length - seconds) % 60,
299 length? (seconds * 100 + length / 2) / length : 0,
300 length / 60,
301 length % 60
302 );
303 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
304 return msg;
305 empty:
306 return para_strdup(NULL);
307 }
308
309 static int want_colors(void)
310 {
311 if (conf.color_arg == color_arg_no)
312 return 0;
313 if (conf.color_arg == color_arg_yes)
314 return 1;
315 if (conf.logfile_given)
316 return 0;
317 return isatty(STDERR_FILENO);
318 }
319
320 static void parse_config_or_die(void)
321 {
322 int ret;
323 char *config_file;
324 struct audiod_cmdline_parser_params params = {
325 .override = 0,
326 .initialize = 0,
327 .check_required = 1,
328 .check_ambiguity = 0,
329 .print_errors = 1
330 };
331
332 if (conf.config_file_given)
333 config_file = para_strdup(conf.config_file_arg);
334 else {
335 char *home = para_homedir();
336 config_file = make_message("%s/.paraslash/audiod.conf", home);
337 free(home);
338 }
339 ret = file_exists(config_file);
340 if (conf.config_file_given && !ret) {
341 PARA_EMERG_LOG("can not read config file %s\n", config_file);
342 goto err;
343 }
344 if (ret)
345 audiod_cmdline_parser_config_file(config_file, &conf, &params);
346 free(config_file);
347 daemon_set_loglevel(conf.loglevel_arg);
348 return;
349 err:
350 free(config_file);
351 exit(EXIT_FAILURE);
352 }
353
354 static void setup_signal_handling(void)
355 {
356 sig_task->fd = para_signal_init();
357 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
358 para_install_sighandler(SIGINT);
359 para_install_sighandler(SIGTERM);
360 para_install_sighandler(SIGHUP);
361 para_sigaction(SIGPIPE, SIG_IGN);
362 }
363
364 static void clear_slot(int slot_num)
365 {
366 struct slot_info *s = &slot[slot_num];
367
368 PARA_INFO_LOG("clearing slot %d\n", slot_num);
369 memset(s, 0, sizeof(struct slot_info));
370 s->format = -1;
371 }
372
373 static void close_receiver(int slot_num)
374 {
375 struct slot_info *s = &slot[slot_num];
376 struct audio_format_info *a;
377
378 if (s->format < 0 || !s->receiver_node)
379 return;
380 a = &afi[s->format];
381 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
382 audio_formats[s->format], slot_num);
383 a->receiver->close(s->receiver_node);
384 btr_free_node(s->receiver_node->btrn);
385 free(s->receiver_node);
386 s->receiver_node = NULL;
387 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
388 &a->restart_barrier);
389 }
390
391 static void writer_cleanup(struct writer_node *wn)
392 {
393 struct writer *w;
394
395 if (!wn)
396 return;
397 w = writers + wn->writer_num;
398 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
399 w->close(wn);
400 btr_free_node(wn->btrn);
401 }
402
403 static void close_writers(struct slot_info *s)
404 {
405 struct audio_format_info *a;
406 int i;
407
408 if (s->format < 0)
409 return;
410 assert(s->wns);
411 a = afi + s->format;
412 if (a->num_writers == 0)
413 writer_cleanup(s->wns);
414 else {
415 for (i = 0; i < a->num_writers; i++)
416 writer_cleanup(s->wns + i);
417 }
418 free(s->wns);
419 s->wns = NULL;
420 }
421
422 static void close_filters(struct slot_info *s)
423 {
424 int i;
425 struct audio_format_info *a = afi + s->format;
426 if (a->num_filters == 0)
427 return;
428 for (i = 0; i < a->num_filters; i++) {
429 struct filter_node *fn = s->fns + i;
430 struct filter *f;
431
432 if (!fn)
433 continue;
434 f = filters + fn->filter_num;
435 if (f->close)
436 f->close(fn);
437 btr_free_node(fn->btrn);
438 }
439 free(s->fns);
440 s->fns = NULL;
441 }
442
443 /*
444 * Whenever a task commits suicide by returning from post_select with t->error
445 * < 0, it also removes its btr node. We do exactly that to kill a running
446 * task. Note that the scheduler checks t->error also _before_ each pre/post
447 * select call, so the victim will never be scheduled again.
448 */
449 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
450 {
451 if (t->error < 0)
452 return;
453 t->error = error;
454 btr_remove_node(btrn);
455 }
456
457 static void kill_all_decoders(int error)
458 {
459 int i;
460
461 FOR_EACH_SLOT(i) {
462 struct slot_info *s = slot + i;
463 if (s->format < 0)
464 continue;
465 if (!s->receiver_node)
466 continue;
467 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
468 error);
469 }
470 }
471
472 static int get_empty_slot(void)
473 {
474 int i;
475 struct slot_info *s;
476
477 FOR_EACH_SLOT(i) {
478 s = &slot[i];
479 if (s->format < 0) {
480 clear_slot(i);
481 return i;
482 }
483 if (s->wns || s->receiver_node || s->fns)
484 continue;
485 clear_slot(i);
486 return i;
487 }
488 return -E_NO_MORE_SLOTS;
489 }
490
491 static void open_filters(struct slot_info *s)
492 {
493 struct audio_format_info *a = afi + s->format;
494 struct filter_node *fn;
495 int nf = a->num_filters;
496 struct btr_node *parent;
497 int i;
498
499 if (nf == 0)
500 return;
501 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
502 assert(s->fns == NULL);
503 s->fns = para_calloc(nf * sizeof(struct filter_node));
504 parent = s->receiver_node->btrn;
505 for (i = 0; i < nf; i++) {
506 struct filter *f = filters + a->filter_nums[i];
507 fn = s->fns + i;
508 fn->filter_num = a->filter_nums[i];
509 fn->conf = a->filter_conf[i];
510 fn->task.pre_select = f->pre_select;
511 fn->task.post_select = f->post_select;
512
513 fn->btrn = btr_new_node(&(struct btr_node_description)
514 EMBRACE(.name = f->name, .parent = parent,
515 .handler = f->execute, .context = fn));
516
517 f->open(fn);
518 register_task(&sched, &fn->task);
519 parent = fn->btrn;
520 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
521 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
522 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
523 }
524 }
525
526 static void open_writers(struct slot_info *s)
527 {
528 int i;
529 struct audio_format_info *a = afi + s->format;
530 struct writer_node *wn;
531 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
532
533 assert(s->wns == NULL);
534 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
535 * sizeof(struct writer_node));
536 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
537 for (i = 0; i < a->num_writers; i++) {
538 wn = s->wns + i;
539 wn->conf = a->writer_conf[i];
540 wn->writer_num = a->writer_nums[i];
541 register_writer_node(wn, parent, &sched);
542 }
543 }
544
545 /* returns slot num on success */
546 static int open_receiver(int format)
547 {
548 struct audio_format_info *a = &afi[format];
549 struct slot_info *s;
550 int ret, slot_num;
551 struct receiver *r = a->receiver;
552 struct receiver_node *rn;
553
554 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
555 ret = get_empty_slot();
556 if (ret < 0)
557 return ret;
558 slot_num = ret;
559 rn = para_calloc(sizeof(*rn));
560 rn->receiver = r;
561 rn->conf = a->receiver_conf;
562 rn->btrn = btr_new_node(&(struct btr_node_description)
563 EMBRACE(.name = r->name, .context = rn));
564 ret = r->open(rn);
565 if (ret < 0) {
566 btr_free_node(rn->btrn);
567 free(rn);
568 return ret;
569 }
570 s = &slot[slot_num];
571 s->format = format;
572 s->receiver_node = rn;
573 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
574 audio_formats[format], r->name, slot_num);
575 rn->task.pre_select = r->pre_select;
576 rn->task.post_select = r->post_select;
577 sprintf(rn->task.status, "%s receiver node", r->name);
578 register_task(&sched, &rn->task);
579 return slot_num;
580 }
581
582 static bool receiver_running(void)
583 {
584 int i;
585 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
586
587 FOR_EACH_SLOT(i) {
588 struct slot_info *s = &slot[i];
589 long unsigned ss2 = s->server_stream_start.tv_sec;
590
591 if (!s->receiver_node)
592 continue;
593 if (s->receiver_node->task.error >= 0)
594 return true;
595 if (ss1 == ss2)
596 return true;
597 }
598 return false;
599 }
600
601 /**
602 * Return the root node of the current buffer tree.
603 *
604 * This is only used for stream grabbing.
605 *
606 * \return \p NULL if no slot is currently active. If more than one buffer tree
607 * exists, the node corresponding to the most recently started receiver is
608 * returned.
609 */
610 struct btr_node *audiod_get_btr_root(void)
611 {
612 int i, newest_slot = -1;
613 struct timeval newest_rstime = {0, 0};
614
615 FOR_EACH_SLOT(i) {
616 struct slot_info *s = &slot[i];
617 struct timeval rstime;
618 if (!s->receiver_node)
619 continue;
620 if (s->receiver_node->task.error < 0)
621 continue;
622 btr_get_node_start(s->receiver_node->btrn, &rstime);
623 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
624 continue;
625 newest_rstime = rstime;
626 newest_slot = i;
627 }
628 if (newest_slot == -1)
629 return NULL;
630 return slot[newest_slot].receiver_node->btrn;
631 }
632
633 /* whether a new instance of a decoder should be started. */
634 static bool must_start_decoder(void)
635 {
636 int cafn = stat_task->current_audio_format_num;
637 unsigned vs = stat_task->vss_status;
638
639 if (audiod_status != AUDIOD_ON)
640 return false;
641 if (cafn < 0)
642 return false;
643 if (!stat_task->ct)
644 return false;
645 if (vs & VSS_STATUS_FLAG_NEXT)
646 return false;
647 if (!(vs & VSS_STATUS_FLAG_PLAYING))
648 return false;
649 if (receiver_running())
650 return false;
651 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
652 return false;
653 return true;
654 }
655
656 static unsigned compute_time_diff(const struct timeval *status_time)
657 {
658 struct timeval tmp, diff;
659 static unsigned count;
660 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
661 const struct timeval max_deviation = {0, 500 * 1000};
662 const int time_smooth = 5;
663
664 if (!status_time)
665 return count;
666 sign = tv_diff(status_time, now, &diff);
667 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
668 // sign, sa_time_diff_sign);
669 if (!count) {
670 sa_time_diff_sign = sign;
671 stat_task->sa_time_diff = diff;
672 count++;
673 goto out;
674 }
675 if (count > 5) {
676 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
677 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
678 PARA_WARNING_LOG("time diff jump: %lims\n",
679 s * tv2ms(&tmp));
680 }
681 count++;
682 sa_time_diff_sign = tv_convex_combination(
683 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
684 count > 10? sign : sign * time_smooth, &diff,
685 &tmp);
686 stat_task->sa_time_diff = tmp;
687 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
688 sign < 0? "-" : "+",
689 tv2ms(&diff),
690 sa_time_diff_sign < 0? "-" : "+",
691 tv2ms(&stat_task->sa_time_diff)
692 );
693 out:
694 stat_task->sa_time_diff_sign = sa_time_diff_sign;
695 return count;
696 }
697
698 static int update_item(int itemnum, char *buf)
699 {
700 long unsigned sec, usec;
701
702 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
703 return 1;
704 free(stat_item_values[itemnum]);
705 stat_item_values[itemnum] = para_strdup(buf);
706 stat_client_write_item(itemnum);
707 switch (itemnum) {
708 case SI_STATUS_FLAGS:
709 stat_task->vss_status = 0;
710 if (strchr(buf, 'N'))
711 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
712 if (strchr(buf, 'P'))
713 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
714 break;
715 case SI_OFFSET:
716 stat_task->offset_seconds = atoi(buf);
717 break;
718 case SI_SECONDS_TOTAL:
719 stat_task->length_seconds = atoi(buf);
720 break;
721 case SI_STREAM_START:
722 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
723 stat_task->server_stream_start.tv_sec = sec;
724 stat_task->server_stream_start.tv_usec = usec;
725 }
726 break;
727 case SI_CURRENT_TIME:
728 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
729 struct timeval tv = {sec, usec};
730 compute_time_diff(&tv);
731 }
732 break;
733 case SI_FORMAT:
734 stat_task->current_audio_format_num
735 = get_audio_format_num(buf);
736 }
737 return 1;
738 }
739
740 static int parse_stream_command(const char *txt, char **cmd)
741 {
742 int ret, len;
743 char *re, *p = strchr(txt, ':');
744
745 if (!p)
746 return -E_MISSING_COLON;
747 *cmd = p + 1;
748 len = p - txt;
749 re = malloc(len + 1);
750 strncpy(re, txt, len);
751 re[len] = '\0';
752 ret = get_matching_audio_format_nums(re);
753 free(re);
754 return ret;
755 }
756
757 static int add_filter(int format, char *cmdline)
758 {
759 struct audio_format_info *a = &afi[format];
760 int filter_num, nf = a->num_filters;
761 void *cfg;
762
763 filter_num = check_filter_arg(cmdline, &cfg);
764 if (filter_num < 0)
765 return filter_num;
766 a->filter_conf = para_realloc(a->filter_conf,
767 (nf + 1) * sizeof(void *));
768 a->filter_nums = para_realloc(a->filter_nums,
769 (nf + 1) * sizeof(unsigned));
770 a->filter_nums[nf] = filter_num;
771 a->filter_conf[nf] = cfg;
772 a->num_filters++;
773 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
774 filters[filter_num].name);
775 return filter_num;
776 }
777
778 static int parse_writer_args(void)
779 {
780 int i, ret;
781 char *cmd;
782 struct audio_format_info *a;
783
784 for (i = 0; i < conf.writer_given; i++) {
785 void *wconf;
786 int j, nw, writer_num, af_mask;
787
788 ret = parse_stream_command(conf.writer_arg[i], &cmd);
789 if (ret < 0)
790 return ret;
791 af_mask = ret;
792 FOR_EACH_AUDIO_FORMAT(j) {
793 a = afi + j;
794 if ((af_mask & (1 << j)) == 0) /* no match */
795 continue;
796 wconf = check_writer_arg_or_die(cmd, &writer_num);
797 nw = a->num_writers;
798 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
799 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
800 a->writer_nums[nw] = writer_num;
801 a->writer_conf[nw] = wconf;
802 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
803 nw, writer_names[writer_num]);
804 a->num_writers++;
805 }
806 }
807 /* Use default writer for audio formats which are not yet set up. */
808 FOR_EACH_AUDIO_FORMAT(i) {
809 struct writer *w = writers + DEFAULT_WRITER;
810 a = afi + i;
811 if (a->num_writers > 0)
812 continue; /* already set up */
813 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
814 writer_names[DEFAULT_WRITER]);
815 a->writer_nums = para_malloc(sizeof(int));
816 a->writer_nums[0] = DEFAULT_WRITER;
817 a->writer_conf = para_malloc(sizeof(void *));
818 a->writer_conf[0] = w->parse_config_or_die("");
819 a->num_writers = 1;
820 }
821 return 1;
822 }
823
824 static int parse_receiver_args(void)
825 {
826 int i, ret, receiver_num;
827 char *cmd = NULL;
828 struct audio_format_info *a;
829
830 for (i = conf.receiver_given - 1; i >= 0; i--) {
831 char *arg;
832 int j, af_mask;
833
834 ret = parse_stream_command(conf.receiver_arg[i], &arg);
835 if (ret < 0)
836 goto out;
837 af_mask = ret;
838 FOR_EACH_AUDIO_FORMAT(j) {
839 a = afi + j;
840 if ((af_mask & (1 << j)) == 0) /* no match */
841 continue;
842 /*
843 * If multiple receivers are given for this audio format, the
844 * last one wins and we have to free the previous receiver
845 * config here. Since we are iterating backwards, the winning
846 * receiver arg is in fact the first one given.
847 */
848 if (a->receiver_conf)
849 a->receiver->free_config(a->receiver_conf);
850 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
851 ret = -E_RECV_SYNTAX;
852 if (!a->receiver_conf)
853 goto out;
854 a->receiver = receivers + receiver_num;
855 }
856 }
857 /*
858 * Use the first available receiver with no arguments for those audio
859 * formats for which no receiver was specified.
860 */
861 cmd = para_strdup(receivers[0].name);
862 FOR_EACH_AUDIO_FORMAT(i) {
863 a = &afi[i];
864 if (a->receiver_conf)
865 continue;
866 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
867 if (!a->receiver_conf)
868 return -E_RECV_SYNTAX;
869 a->receiver = &receivers[receiver_num];
870 }
871 FOR_EACH_AUDIO_FORMAT(i) {
872 a = afi + i;
873 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
874 audio_formats[i], a->receiver->name);
875 }
876 ret = 1;
877 out:
878 free(cmd);
879 return ret;
880 }
881
882 static int init_default_filters(void)
883 {
884 int i, ret = 1;
885
886 FOR_EACH_AUDIO_FORMAT(i) {
887 struct audio_format_info *a = &afi[i];
888 char *tmp;
889 int j;
890
891 if (a->num_filters)
892 continue; /* no default -- nothing to to */
893 /*
894 * udp and dccp streams are fec-encoded, so add fecdec as the
895 * first filter.
896 */
897 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
898 strcmp(afi[i].receiver->name, "dccp") == 0) {
899 tmp = para_strdup("fecdec");
900 add_filter(i, tmp);
901 free(tmp);
902 if (ret < 0)
903 goto out;
904 }
905 /* add "dec" to audio format name */
906 tmp = make_message("%sdec", audio_formats[i]);
907 for (j = 0; filters[j].name; j++)
908 if (!strcmp(tmp, filters[j].name))
909 break;
910 free(tmp);
911 ret = -E_UNSUPPORTED_FILTER;
912 if (!filters[j].name)
913 goto out;
914 tmp = para_strdup(filters[j].name);
915 ret = add_filter(i, tmp);
916 free(tmp);
917 if (ret < 0)
918 goto out;
919 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
920 filters[j].name);
921 }
922 out:
923 return ret;
924 }
925
926 static int parse_filter_args(void)
927 {
928 int i, j, ret, af_mask;
929
930 for (i = 0; i < conf.filter_given; i++) {
931 char *arg;
932 ret = parse_stream_command(conf.filter_arg[i], &arg);
933 if (ret < 0)
934 goto out;
935 af_mask = ret;
936 FOR_EACH_AUDIO_FORMAT(j) {
937 if ((af_mask & (1 << j)) == 0) /* no match */
938 continue;
939 ret = add_filter(j, arg);
940 if (ret < 0)
941 goto out;
942 }
943 }
944 ret = init_default_filters(); /* use default values for the rest */
945 out:
946 return ret;
947 }
948
949 static int parse_stream_args(void)
950 {
951 int ret;
952
953 ret = parse_receiver_args();
954 if (ret < 0)
955 return ret;
956 ret = parse_filter_args();
957 if (ret < 0)
958 return ret;
959 ret = parse_writer_args();
960 if (ret < 0)
961 return ret;
962 return 1;
963 }
964
965 /* does not unlink socket on errors */
966 static int audiod_get_socket(void)
967 {
968 struct sockaddr_un unix_addr;
969 int ret, fd;
970
971 if (conf.socket_given)
972 socket_name = para_strdup(conf.socket_arg);
973 else {
974 char *hn = para_hostname();
975 socket_name = make_message("/var/paraslash/audiod_socket.%s",
976 hn);
977 free(hn);
978 }
979 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
980 if (conf.force_given)
981 unlink(socket_name);
982 ret = create_local_socket(socket_name, &unix_addr,
983 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
984 if (ret < 0)
985 goto err;
986 fd = ret;
987 if (listen(fd , 5) < 0) {
988 ret = -ERRNO_TO_PARA_ERROR(errno);
989 goto err;
990 }
991 ret = mark_fd_nonblocking(fd);
992 if (ret < 0)
993 goto err;
994 return fd;
995 err:
996 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
997 exit(EXIT_FAILURE);
998 }
999
1000 static void signal_pre_select(struct sched *s, struct task *t)
1001 {
1002 struct signal_task *st = container_of(t, struct signal_task, task);
1003 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1004 }
1005
1006 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1007 {
1008 int signum;
1009
1010 signum = para_next_signal(&s->rfds);
1011 switch (signum) {
1012 case SIGINT:
1013 case SIGTERM:
1014 case SIGHUP:
1015 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1016 clean_exit(EXIT_FAILURE, "caught deadly signal");
1017 }
1018 }
1019
1020 static void signal_setup_default(struct signal_task *st)
1021 {
1022 st->task.pre_select = signal_pre_select;
1023 st->task.post_select = signal_post_select;
1024 sprintf(st->task.status, "signal task");
1025 }
1026
1027 static void command_pre_select(struct sched *s, struct task *t)
1028 {
1029 struct command_task *ct = container_of(t, struct command_task, task);
1030 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1031 }
1032
1033 static void command_post_select(struct sched *s, struct task *t)
1034 {
1035 int ret;
1036 struct command_task *ct = container_of(t, struct command_task, task);
1037 static struct timeval last_status_dump;
1038 struct timeval tmp, delay = {0, 500 * 1000};
1039
1040 tv_add(&last_status_dump, &delay, &tmp);
1041 if (tv_diff(&tmp, now, NULL) < 0) {
1042 audiod_status_dump();
1043 last_status_dump = *now;
1044 }
1045
1046 ret = handle_connect(ct->fd, &s->rfds);
1047 if (ret < 0)
1048 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1049 audiod_status_dump();
1050 }
1051
1052 static void init_command_task(struct command_task *ct)
1053 {
1054 ct->task.pre_select = command_pre_select;
1055 ct->task.post_select = command_post_select;
1056 ct->task.error = 0;
1057 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1058 sprintf(ct->task.status, "command task");
1059 }
1060
1061 static void close_stat_pipe(void)
1062 {
1063 if (!stat_task->ct)
1064 return;
1065 client_close(stat_task->ct);
1066 stat_task->ct = NULL;
1067 clear_and_dump_items();
1068 stat_task->length_seconds = 0;
1069 stat_task->offset_seconds = 0;
1070 stat_task->vss_status = 0;
1071 stat_task->current_audio_format_num = -1;
1072 audiod_status_dump();
1073 }
1074
1075 /**
1076 * close the connection to para_server and exit
1077 *
1078 * \param status the exit status which is passed to exit(3)
1079 * \param msg the log message
1080 *
1081 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1082 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1083 * EXIT_FAILURE.
1084 *
1085 * \sa exit(3)
1086 */
1087 void __noreturn clean_exit(int status, const char *msg)
1088 {
1089 PARA_EMERG_LOG("%s\n", msg);
1090 if (socket_name)
1091 unlink(socket_name);
1092 close_stat_pipe();
1093 exit(status);
1094 }
1095
1096 /* avoid busy loop if server is down */
1097 static void set_stat_task_restart_barrier(unsigned seconds)
1098 {
1099 struct timeval delay = {seconds, 0};
1100 tv_add(now, &delay, &stat_task->restart_barrier);
1101 }
1102
1103 static void try_to_close_slot(int slot_num)
1104 {
1105 struct slot_info *s = &slot[slot_num];
1106 struct audio_format_info *a = afi + s->format;
1107 int i;
1108
1109 if (s->format < 0)
1110 return;
1111 if (s->receiver_node && s->receiver_node->task.error >= 0)
1112 return;
1113 for (i = 0; i < a->num_filters; i++)
1114 if (s->fns && s->fns[i].task.error >= 0)
1115 return;
1116 if (a->num_writers > 0) {
1117 for (i = 0; i < a->num_writers; i++)
1118 if (s->wns && s->wns[i].task.error >= 0)
1119 return;
1120 } else {
1121 if (s->wns && s->wns[0].task.error >= 0)
1122 return;
1123 }
1124 PARA_INFO_LOG("closing slot %d\n", slot_num);
1125 close_writers(s);
1126 close_filters(s);
1127 close_receiver(slot_num);
1128 clear_slot(slot_num);
1129 }
1130
1131 /*
1132 * Check if any receivers/filters/writers need to be started and do so if
1133 * necessary.
1134 */
1135 static void start_stop_decoders(void)
1136 {
1137 int i, ret;
1138 struct slot_info *sl;
1139 struct audio_format_info *a;
1140
1141 FOR_EACH_SLOT(i)
1142 try_to_close_slot(i);
1143 if (audiod_status != AUDIOD_ON ||
1144 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1145 return kill_all_decoders(-E_NOT_PLAYING);
1146 if (!must_start_decoder())
1147 return;
1148 ret = open_receiver(stat_task->current_audio_format_num);
1149 if (ret < 0) {
1150 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1151 return;
1152 }
1153 sl = slot + ret;
1154 a = afi + sl->format;
1155 if (a->num_filters)
1156 open_filters(sl);
1157 open_writers(sl);
1158 activate_grab_clients(&sched);
1159 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1160 }
1161
1162 static void status_pre_select(struct sched *s, struct task *t)
1163 {
1164 struct status_task *st = container_of(t, struct status_task, task);
1165 int ret, cafn = stat_task->current_audio_format_num;
1166
1167 if (must_start_decoder())
1168 goto min_delay;
1169 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1170 if (ret > 0)
1171 goto min_delay;
1172 if (st->ct && audiod_status == AUDIOD_OFF)
1173 goto min_delay;
1174 if (!st->ct && audiod_status != AUDIOD_OFF)
1175 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1176 if (cafn >= 0)
1177 sched_request_barrier(&afi[cafn].restart_barrier, s);
1178 /*
1179 * If para_server is playing we'd like to have a smooth time display
1180 * even if we are running in standby mode. So we request a timeout that
1181 * expires at the next full second.
1182 */
1183 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1184 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1185 return;
1186 min_delay:
1187 sched_min_delay(s);
1188 }
1189
1190 /* restart the client task if necessary */
1191 static void status_post_select(struct sched *s, struct task *t)
1192 {
1193 struct status_task *st = container_of(t, struct status_task, task);
1194
1195 if (audiod_status == AUDIOD_OFF) {
1196 if (!st->ct)
1197 goto out;
1198 if (st->ct->task.error >= 0) {
1199 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1200 goto out;
1201 }
1202 if (st->ct->task.error >= 0)
1203 goto out;
1204 close_stat_pipe();
1205 st->clock_diff_count = conf.clock_diff_count_arg;
1206 goto out;
1207 }
1208 if (st->ct) {
1209 char *buf;
1210 size_t sz;
1211 int ret;
1212 if (st->ct->task.error < 0) {
1213 if (st->ct->task.error >= 0)
1214 goto out;
1215 close_stat_pipe();
1216 goto out;
1217 }
1218 if (st->ct->status != CL_RECEIVING)
1219 goto out;
1220 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1221 if (ret <= 0) {
1222 struct timeval diff;
1223 tv_diff(now, &st->last_status_read, &diff);
1224 if (diff.tv_sec > 61)
1225 kill_btrn(st->ct->btrn, &st->ct->task,
1226 -E_STATUS_TIMEOUT);
1227 goto out;
1228 }
1229 btr_merge(st->btrn, st->min_iqs);
1230 sz = btr_next_buffer(st->btrn, &buf);
1231 ret = for_each_stat_item(buf, sz, update_item);
1232 if (ret < 0) {
1233 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1234 goto out;
1235 }
1236 if (sz != ret) {
1237 btr_consume(st->btrn, sz - ret);
1238 st->last_status_read = *now;
1239 st->min_iqs = 0;
1240 } else /* current status item crosses buffers */
1241 st->min_iqs = sz + 1;
1242 goto out;
1243 }
1244 btr_drain(st->btrn);
1245 st->current_audio_format_num = -1;
1246 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1247 goto out;
1248 if (st->clock_diff_count) { /* get status only one time */
1249 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1250 int argc = 5;
1251 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1252 st->clock_diff_count--;
1253 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1254 set_stat_task_restart_barrier(2);
1255
1256 } else {
1257 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1258 int argc = 4;
1259 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1260 set_stat_task_restart_barrier(5);
1261 }
1262 free(stat_item_values[SI_BASENAME]);
1263 stat_item_values[SI_BASENAME] = para_strdup(
1264 "no connection to para_server");
1265 stat_client_write_item(SI_BASENAME);
1266 st->last_status_read = *now;
1267 out:
1268 start_stop_decoders();
1269 }
1270
1271 static void init_status_task(struct status_task *st)
1272 {
1273 memset(st, 0, sizeof(struct status_task));
1274 st->task.pre_select = status_pre_select;
1275 st->task.post_select = status_post_select;
1276 st->sa_time_diff_sign = 1;
1277 st->clock_diff_count = conf.clock_diff_count_arg;
1278 st->current_audio_format_num = -1;
1279 sprintf(st->task.status, "stat");
1280 st->btrn = btr_new_node(&(struct btr_node_description)
1281 EMBRACE(.name = "stat"));
1282 }
1283
1284 static void set_initial_status(void)
1285 {
1286 audiod_status = AUDIOD_ON;
1287 if (!conf.mode_given)
1288 return;
1289 if (!strcmp(conf.mode_arg, "sb")) {
1290 audiod_status = AUDIOD_STANDBY;
1291 return;
1292 }
1293 if (!strcmp(conf.mode_arg, "off")) {
1294 audiod_status = AUDIOD_OFF;
1295 return;
1296 }
1297 if (strcmp(conf.mode_arg, "on"))
1298 PARA_WARNING_LOG("invalid mode\n");
1299 }
1300
1301 __noreturn static void print_help_and_die(void)
1302 {
1303 int d = conf.detailed_help_given;
1304 const char **p = d? audiod_args_info_detailed_help
1305 : audiod_args_info_help;
1306
1307 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1308 AUDIOD_CMDLINE_PARSER_VERSION);
1309 printf_or_die("%s\n\n", audiod_args_info_usage);
1310 for (; *p; p++)
1311 printf_or_die("%s\n", *p);
1312 print_receiver_helps(d);
1313 print_filter_helps(d);
1314 print_writer_helps(d);
1315 exit(0);
1316 }
1317
1318 static void init_colors_or_die(void)
1319 {
1320 int i;
1321
1322 if (!want_colors())
1323 return;
1324 daemon_set_default_log_colors();
1325 daemon_set_flag(DF_COLOR_LOG);
1326 for (i = 0; i < conf.log_color_given; i++)
1327 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1328 }
1329
1330 /**
1331 * the main function of para_audiod
1332 *
1333 * \param argc usual argument count
1334 * \param argv usual argument vector
1335 *
1336 * \return EXIT_SUCCESS or EXIT_FAILURE
1337 *
1338 * \sa para_audiod(1)
1339 * */
1340 int main(int argc, char *argv[])
1341 {
1342 int ret, i;
1343 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1344 struct audiod_cmdline_parser_params params = {
1345 .override = 0,
1346 .initialize = 1,
1347 .check_required = 0,
1348 .check_ambiguity = 0,
1349 .print_errors = 1
1350 };
1351
1352 valid_fd_012();
1353 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1354 exit(EXIT_FAILURE);
1355 HANDLE_VERSION_FLAG("audiod", conf);
1356 /* init receivers/filters/writers early to make help work */
1357 recv_init();
1358 filter_init();
1359 writer_init();
1360 if (conf.help_given || conf.detailed_help_given)
1361 print_help_and_die();
1362 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1363 parse_config_or_die();
1364 init_colors_or_die();
1365 init_random_seed_or_die();
1366 daemon_set_flag(DF_LOG_TIME);
1367 daemon_set_flag(DF_LOG_HOSTNAME);
1368 daemon_set_flag(DF_LOG_LL);
1369 if (conf.log_timing_given)
1370 daemon_set_flag(DF_LOG_TIMING);
1371 if (conf.logfile_given) {
1372 daemon_set_logfile(conf.logfile_arg);
1373 daemon_open_log_or_die();
1374 }
1375 ret = parse_stream_args();
1376 if (ret < 0) {
1377 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1378 exit(EXIT_FAILURE);
1379 }
1380 log_welcome("para_audiod");
1381 set_server_start_time(NULL);
1382 set_initial_status();
1383 FOR_EACH_SLOT(i)
1384 clear_slot(i);
1385 setup_signal_handling();
1386 signal_setup_default(sig_task);
1387
1388 init_status_task(stat_task);
1389 init_command_task(cmd_task);
1390
1391 if (conf.daemon_given)
1392 daemonize(false /* parent exits immediately */);
1393
1394 register_task(&sched, &sig_task->task);
1395 register_task(&sched, &cmd_task->task);
1396 register_task(&sched, &stat_task->task);
1397 sched.default_timeout.tv_sec = 2;
1398 sched.default_timeout.tv_usec = 999 * 1000;
1399 ret = schedule(&sched);
1400
1401 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1402 return EXIT_FAILURE;
1403 }