Use sideband also for challenge response.
[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) { /* 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) {
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 btr_get_node_start(s->receiver_node->btrn, &rstime);
280 ret = tv_diff(&rstime, &sss, &rskip);
281 if (ret > 0) { /* audiod was started in the middle of the stream */
282 tv_add(&wtime, &rskip, &sum);
283 seconds += sum.tv_sec;
284 } else
285 seconds += wtime.tv_sec;
286 out:
287 seconds = PARA_MIN(seconds, length);
288 seconds = PARA_MAX(seconds, 0);
289 msg = make_message(
290 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
291 s? "" : "~",
292 seconds / 60,
293 seconds % 60,
294 (length - seconds) / 60,
295 (length - seconds) % 60,
296 length? (seconds * 100 + length / 2) / length : 0,
297 length / 60,
298 length % 60
299 );
300 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
301 return msg;
302 empty:
303 return para_strdup(NULL);
304 }
305
306 static int want_colors(void)
307 {
308 if (conf.color_arg == color_arg_no)
309 return 0;
310 if (conf.color_arg == color_arg_yes)
311 return 1;
312 if (conf.logfile_given)
313 return 0;
314 return isatty(STDERR_FILENO);
315 }
316
317 static void parse_config_or_die(void)
318 {
319 int ret;
320 char *config_file;
321 struct audiod_cmdline_parser_params params = {
322 .override = 0,
323 .initialize = 0,
324 .check_required = 1,
325 .check_ambiguity = 0,
326 .print_errors = 1
327 };
328
329 if (conf.config_file_given)
330 config_file = para_strdup(conf.config_file_arg);
331 else {
332 char *home = para_homedir();
333 config_file = make_message("%s/.paraslash/audiod.conf", home);
334 free(home);
335 }
336 ret = file_exists(config_file);
337 if (conf.config_file_given && !ret) {
338 PARA_EMERG_LOG("can not read config file %s\n", config_file);
339 goto err;
340 }
341 if (ret)
342 audiod_cmdline_parser_config_file(config_file, &conf, &params);
343 free(config_file);
344 daemon_set_loglevel(conf.loglevel_arg);
345 return;
346 err:
347 free(config_file);
348 exit(EXIT_FAILURE);
349 }
350
351 static void setup_signal_handling(void)
352 {
353 sig_task->fd = para_signal_init();
354 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
355 para_install_sighandler(SIGINT);
356 para_install_sighandler(SIGTERM);
357 para_install_sighandler(SIGHUP);
358 para_sigaction(SIGPIPE, SIG_IGN);
359 }
360
361 static void clear_slot(int slot_num)
362 {
363 struct slot_info *s = &slot[slot_num];
364
365 PARA_INFO_LOG("clearing slot %d\n", slot_num);
366 memset(s, 0, sizeof(struct slot_info));
367 s->format = -1;
368 }
369
370 static void close_receiver(int slot_num)
371 {
372 struct slot_info *s = &slot[slot_num];
373 struct audio_format_info *a;
374
375 if (s->format < 0 || !s->receiver_node)
376 return;
377 a = &afi[s->format];
378 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
379 audio_formats[s->format], slot_num);
380 a->receiver->close(s->receiver_node);
381 btr_free_node(s->receiver_node->btrn);
382 free(s->receiver_node);
383 s->receiver_node = NULL;
384 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
385 &a->restart_barrier);
386 }
387
388 static void writer_cleanup(struct writer_node *wn)
389 {
390 struct writer *w;
391
392 if (!wn)
393 return;
394 w = writers + wn->writer_num;
395 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
396 w->close(wn);
397 btr_free_node(wn->btrn);
398 }
399
400 static void close_writers(struct slot_info *s)
401 {
402 struct audio_format_info *a;
403 int i;
404
405 if (s->format < 0)
406 return;
407 assert(s->wns);
408 a = afi + s->format;
409 if (a->num_writers == 0)
410 writer_cleanup(s->wns);
411 else {
412 for (i = 0; i < a->num_writers; i++)
413 writer_cleanup(s->wns + i);
414 }
415 free(s->wns);
416 s->wns = NULL;
417 }
418
419 static void close_filters(struct slot_info *s)
420 {
421 int i;
422 struct audio_format_info *a = afi + s->format;
423 if (a->num_filters == 0)
424 return;
425 for (i = 0; i < a->num_filters; i++) {
426 struct filter_node *fn = s->fns + i;
427 struct filter *f;
428
429 if (!fn)
430 continue;
431 f = filters + fn->filter_num;
432 if (f->close)
433 f->close(fn);
434 btr_free_node(fn->btrn);
435 }
436 free(s->fns);
437 s->fns = NULL;
438 }
439
440 /*
441 * Whenever a task commits suicide by returning from post_select with t->error
442 * < 0, it also removes its btr node. We do exactly that to kill a running
443 * task. Note that the scheduler checks t->error also _before_ each pre/post
444 * select call, so the victim will never be scheduled again.
445 */
446 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
447 {
448 if (t->error < 0)
449 return;
450 t->error = error;
451 btr_remove_node(btrn);
452 }
453
454 static void kill_all_decoders(int error)
455 {
456 int i;
457
458 FOR_EACH_SLOT(i) {
459 struct slot_info *s = slot + i;
460 if (s->format < 0)
461 continue;
462 if (!s->receiver_node)
463 continue;
464 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
465 error);
466 }
467 }
468
469 static int get_empty_slot(void)
470 {
471 int i;
472 struct slot_info *s;
473
474 FOR_EACH_SLOT(i) {
475 s = &slot[i];
476 if (s->format < 0) {
477 clear_slot(i);
478 return i;
479 }
480 if (s->wns || s->receiver_node || s->fns)
481 continue;
482 clear_slot(i);
483 return i;
484 }
485 return -E_NO_MORE_SLOTS;
486 }
487
488 static void open_filters(struct slot_info *s)
489 {
490 struct audio_format_info *a = afi + s->format;
491 struct filter_node *fn;
492 int nf = a->num_filters;
493 struct btr_node *parent;
494 int i;
495
496 if (nf == 0)
497 return;
498 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
499 assert(s->fns == NULL);
500 s->fns = para_calloc(nf * sizeof(struct filter_node));
501 parent = s->receiver_node->btrn;
502 for (i = 0; i < nf; i++) {
503 struct filter *f = filters + a->filter_nums[i];
504 fn = s->fns + i;
505 fn->filter_num = a->filter_nums[i];
506 fn->conf = a->filter_conf[i];
507 fn->task.pre_select = f->pre_select;
508 fn->task.post_select = f->post_select;
509
510 fn->btrn = btr_new_node(&(struct btr_node_description)
511 EMBRACE(.name = f->name, .parent = parent,
512 .handler = f->execute, .context = fn));
513
514 f->open(fn);
515 register_task(&sched, &fn->task);
516 parent = fn->btrn;
517 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
518 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
519 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
520 }
521 }
522
523 static void open_writers(struct slot_info *s)
524 {
525 int i;
526 struct audio_format_info *a = afi + s->format;
527 struct writer_node *wn;
528 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
529
530 assert(s->wns == NULL);
531 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
532 * sizeof(struct writer_node));
533 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
534 for (i = 0; i < a->num_writers; i++) {
535 wn = s->wns + i;
536 wn->conf = a->writer_conf[i];
537 wn->writer_num = a->writer_nums[i];
538 register_writer_node(wn, parent, &sched);
539 }
540 }
541
542 /* returns slot num on success */
543 static int open_receiver(int format)
544 {
545 struct audio_format_info *a = &afi[format];
546 struct slot_info *s;
547 int ret, slot_num;
548 struct receiver *r = a->receiver;
549 struct receiver_node *rn;
550
551 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
552 ret = get_empty_slot();
553 if (ret < 0)
554 return ret;
555 slot_num = ret;
556 rn = para_calloc(sizeof(*rn));
557 rn->receiver = r;
558 rn->conf = a->receiver_conf;
559 rn->btrn = btr_new_node(&(struct btr_node_description)
560 EMBRACE(.name = r->name, .context = rn));
561 ret = r->open(rn);
562 if (ret < 0) {
563 btr_free_node(rn->btrn);
564 free(rn);
565 return ret;
566 }
567 s = &slot[slot_num];
568 s->format = format;
569 s->receiver_node = rn;
570 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
571 audio_formats[format], r->name, slot_num);
572 rn->task.pre_select = r->pre_select;
573 rn->task.post_select = r->post_select;
574 sprintf(rn->task.status, "%s receiver node", r->name);
575 register_task(&sched, &rn->task);
576 return slot_num;
577 }
578
579 static bool receiver_running(void)
580 {
581 int i;
582 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
583
584 FOR_EACH_SLOT(i) {
585 struct slot_info *s = &slot[i];
586 long unsigned ss2 = s->server_stream_start.tv_sec;
587
588 if (!s->receiver_node)
589 continue;
590 if (s->receiver_node->task.error >= 0)
591 return true;
592 if (ss1 == ss2)
593 return true;
594 }
595 return false;
596 }
597
598 /**
599 * Return the root node of the current buffer tree.
600 *
601 * This is only used for stream grabbing.
602 *
603 * \return \p NULL if no slot is currently active. If more than one buffer tree
604 * exists, the node corresponding to the most recently started receiver is
605 * returned.
606 */
607 struct btr_node *audiod_get_btr_root(void)
608 {
609 int i, newest_slot = -1;
610 struct timeval newest_rstime = {0, 0};
611
612 FOR_EACH_SLOT(i) {
613 struct slot_info *s = &slot[i];
614 struct timeval rstime;
615 if (!s->receiver_node)
616 continue;
617 if (s->receiver_node->task.error < 0)
618 continue;
619 btr_get_node_start(s->receiver_node->btrn, &rstime);
620 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
621 continue;
622 newest_rstime = rstime;
623 newest_slot = i;
624 }
625 if (newest_slot == -1)
626 return NULL;
627 return slot[newest_slot].receiver_node->btrn;
628 }
629
630 /* whether a new instance of a decoder should be started. */
631 static bool must_start_decoder(void)
632 {
633 int cafn = stat_task->current_audio_format_num;
634 unsigned vs = stat_task->vss_status;
635
636 if (audiod_status != AUDIOD_ON)
637 return false;
638 if (cafn < 0)
639 return false;
640 if (!stat_task->ct)
641 return false;
642 if (vs & VSS_STATUS_FLAG_NEXT)
643 return false;
644 if (!(vs & VSS_STATUS_FLAG_PLAYING))
645 return false;
646 if (receiver_running())
647 return false;
648 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
649 return false;
650 return true;
651 }
652
653 static unsigned compute_time_diff(const struct timeval *status_time)
654 {
655 struct timeval tmp, diff;
656 static unsigned count;
657 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
658 const struct timeval max_deviation = {0, 500 * 1000};
659 const int time_smooth = 5;
660
661 if (!status_time)
662 return count;
663 sign = tv_diff(status_time, now, &diff);
664 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
665 // sign, sa_time_diff_sign);
666 if (!count) {
667 sa_time_diff_sign = sign;
668 stat_task->sa_time_diff = diff;
669 count++;
670 goto out;
671 }
672 if (count > 5) {
673 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
674 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
675 PARA_WARNING_LOG("time diff jump: %lims\n",
676 s * tv2ms(&tmp));
677 }
678 count++;
679 sa_time_diff_sign = tv_convex_combination(
680 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
681 count > 10? sign : sign * time_smooth, &diff,
682 &tmp);
683 stat_task->sa_time_diff = tmp;
684 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
685 sign < 0? "-" : "+",
686 tv2ms(&diff),
687 sa_time_diff_sign < 0? "-" : "+",
688 tv2ms(&stat_task->sa_time_diff)
689 );
690 out:
691 stat_task->sa_time_diff_sign = sa_time_diff_sign;
692 return count;
693 }
694
695 static int update_item(int itemnum, char *buf)
696 {
697 long unsigned sec, usec;
698
699 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
700 return 1;
701 free(stat_item_values[itemnum]);
702 stat_item_values[itemnum] = para_strdup(buf);
703 stat_client_write_item(itemnum);
704 switch (itemnum) {
705 case SI_STATUS_FLAGS:
706 stat_task->vss_status = 0;
707 if (strchr(buf, 'N'))
708 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
709 if (strchr(buf, 'P'))
710 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
711 break;
712 case SI_OFFSET:
713 stat_task->offset_seconds = atoi(buf);
714 break;
715 case SI_SECONDS_TOTAL:
716 stat_task->length_seconds = atoi(buf);
717 break;
718 case SI_STREAM_START:
719 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
720 stat_task->server_stream_start.tv_sec = sec;
721 stat_task->server_stream_start.tv_usec = usec;
722 }
723 break;
724 case SI_CURRENT_TIME:
725 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
726 struct timeval tv = {sec, usec};
727 compute_time_diff(&tv);
728 }
729 break;
730 case SI_FORMAT:
731 stat_task->current_audio_format_num
732 = get_audio_format_num(buf);
733 }
734 return 1;
735 }
736
737 static int parse_stream_command(const char *txt, char **cmd)
738 {
739 int ret, len;
740 char *re, *p = strchr(txt, ':');
741
742 if (!p)
743 return -E_MISSING_COLON;
744 *cmd = p + 1;
745 len = p - txt;
746 re = malloc(len + 1);
747 strncpy(re, txt, len);
748 re[len] = '\0';
749 ret = get_matching_audio_format_nums(re);
750 free(re);
751 return ret;
752 }
753
754 static int add_filter(int format, char *cmdline)
755 {
756 struct audio_format_info *a = &afi[format];
757 int filter_num, nf = a->num_filters;
758 void *cfg;
759
760 filter_num = check_filter_arg(cmdline, &cfg);
761 if (filter_num < 0)
762 return filter_num;
763 a->filter_conf = para_realloc(a->filter_conf,
764 (nf + 1) * sizeof(void *));
765 a->filter_nums = para_realloc(a->filter_nums,
766 (nf + 1) * sizeof(unsigned));
767 a->filter_nums[nf] = filter_num;
768 a->filter_conf[nf] = cfg;
769 a->num_filters++;
770 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
771 filters[filter_num].name);
772 return filter_num;
773 }
774
775 static int parse_writer_args(void)
776 {
777 int i, ret;
778 char *cmd;
779 struct audio_format_info *a;
780
781 for (i = 0; i < conf.writer_given; i++) {
782 void *wconf;
783 int j, nw, writer_num, af_mask;
784
785 ret = parse_stream_command(conf.writer_arg[i], &cmd);
786 if (ret < 0)
787 return ret;
788 af_mask = ret;
789 FOR_EACH_AUDIO_FORMAT(j) {
790 a = afi + j;
791 if ((af_mask & (1 << j)) == 0) /* no match */
792 continue;
793 wconf = check_writer_arg_or_die(cmd, &writer_num);
794 nw = a->num_writers;
795 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
796 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
797 a->writer_nums[nw] = writer_num;
798 a->writer_conf[nw] = wconf;
799 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
800 nw, writer_names[writer_num]);
801 a->num_writers++;
802 }
803 }
804 /* Use default writer for audio formats which are not yet set up. */
805 FOR_EACH_AUDIO_FORMAT(i) {
806 struct writer *w = writers + DEFAULT_WRITER;
807 a = afi + i;
808 if (a->num_writers > 0)
809 continue; /* already set up */
810 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
811 writer_names[DEFAULT_WRITER]);
812 a->writer_nums = para_malloc(sizeof(int));
813 a->writer_nums[0] = DEFAULT_WRITER;
814 a->writer_conf = para_malloc(sizeof(void *));
815 a->writer_conf[0] = w->parse_config_or_die("");
816 a->num_writers = 1;
817 }
818 return 1;
819 }
820
821 static int parse_receiver_args(void)
822 {
823 int i, ret, receiver_num;
824 char *cmd = NULL;
825 struct audio_format_info *a;
826
827 for (i = conf.receiver_given - 1; i >= 0; i--) {
828 char *arg;
829 int j, af_mask;
830
831 ret = parse_stream_command(conf.receiver_arg[i], &arg);
832 if (ret < 0)
833 goto out;
834 af_mask = ret;
835 FOR_EACH_AUDIO_FORMAT(j) {
836 a = afi + j;
837 if ((af_mask & (1 << j)) == 0) /* no match */
838 continue;
839 /*
840 * If multiple receivers are given for this audio format, the
841 * last one wins and we have to free the previous receiver
842 * config here. Since we are iterating backwards, the winning
843 * receiver arg is in fact the first one given.
844 */
845 if (a->receiver_conf)
846 a->receiver->free_config(a->receiver_conf);
847 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
848 ret = -E_RECV_SYNTAX;
849 if (!a->receiver_conf)
850 goto out;
851 a->receiver = receivers + receiver_num;
852 }
853 }
854 /*
855 * Use the first available receiver with no arguments for those audio
856 * formats for which no receiver was specified.
857 */
858 cmd = para_strdup(receivers[0].name);
859 FOR_EACH_AUDIO_FORMAT(i) {
860 a = &afi[i];
861 if (a->receiver_conf)
862 continue;
863 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
864 if (!a->receiver_conf)
865 return -E_RECV_SYNTAX;
866 a->receiver = &receivers[receiver_num];
867 }
868 FOR_EACH_AUDIO_FORMAT(i) {
869 a = afi + i;
870 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
871 audio_formats[i], a->receiver->name);
872 }
873 ret = 1;
874 out:
875 free(cmd);
876 return ret;
877 }
878
879 static int init_default_filters(void)
880 {
881 int i, ret = 1;
882
883 FOR_EACH_AUDIO_FORMAT(i) {
884 struct audio_format_info *a = &afi[i];
885 char *tmp;
886 int j;
887
888 if (a->num_filters)
889 continue; /* no default -- nothing to to */
890 /*
891 * udp and dccp streams are fec-encoded, so add fecdec as the
892 * first filter.
893 */
894 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
895 strcmp(afi[i].receiver->name, "dccp") == 0) {
896 tmp = para_strdup("fecdec");
897 add_filter(i, tmp);
898 free(tmp);
899 if (ret < 0)
900 goto out;
901 }
902 /* add "dec" to audio format name */
903 tmp = make_message("%sdec", audio_formats[i]);
904 for (j = 0; filters[j].name; j++)
905 if (!strcmp(tmp, filters[j].name))
906 break;
907 free(tmp);
908 ret = -E_UNSUPPORTED_FILTER;
909 if (!filters[j].name)
910 goto out;
911 tmp = para_strdup(filters[j].name);
912 ret = add_filter(i, tmp);
913 free(tmp);
914 if (ret < 0)
915 goto out;
916 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
917 filters[j].name);
918 }
919 out:
920 return ret;
921 }
922
923 static int parse_filter_args(void)
924 {
925 int i, j, ret, af_mask;
926
927 for (i = 0; i < conf.filter_given; i++) {
928 char *arg;
929 ret = parse_stream_command(conf.filter_arg[i], &arg);
930 if (ret < 0)
931 goto out;
932 af_mask = ret;
933 FOR_EACH_AUDIO_FORMAT(j) {
934 if ((af_mask & (1 << j)) == 0) /* no match */
935 continue;
936 ret = add_filter(j, arg);
937 if (ret < 0)
938 goto out;
939 }
940 }
941 ret = init_default_filters(); /* use default values for the rest */
942 out:
943 return ret;
944 }
945
946 static int parse_stream_args(void)
947 {
948 int ret;
949
950 ret = parse_receiver_args();
951 if (ret < 0)
952 return ret;
953 ret = parse_filter_args();
954 if (ret < 0)
955 return ret;
956 ret = parse_writer_args();
957 if (ret < 0)
958 return ret;
959 return 1;
960 }
961
962 /* does not unlink socket on errors */
963 static int audiod_get_socket(void)
964 {
965 struct sockaddr_un unix_addr;
966 int ret, fd;
967
968 if (conf.socket_given)
969 socket_name = para_strdup(conf.socket_arg);
970 else {
971 char *hn = para_hostname();
972 socket_name = make_message("/var/paraslash/audiod_socket.%s",
973 hn);
974 free(hn);
975 }
976 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
977 if (conf.force_given)
978 unlink(socket_name);
979 ret = create_local_socket(socket_name, &unix_addr,
980 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
981 if (ret < 0)
982 goto err;
983 fd = ret;
984 if (listen(fd , 5) < 0) {
985 ret = -ERRNO_TO_PARA_ERROR(errno);
986 goto err;
987 }
988 ret = mark_fd_nonblocking(fd);
989 if (ret < 0)
990 goto err;
991 return fd;
992 err:
993 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
994 exit(EXIT_FAILURE);
995 }
996
997 static void signal_pre_select(struct sched *s, struct task *t)
998 {
999 struct signal_task *st = container_of(t, struct signal_task, task);
1000 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1001 }
1002
1003 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1004 {
1005 int signum;
1006
1007 signum = para_next_signal(&s->rfds);
1008 switch (signum) {
1009 case SIGINT:
1010 case SIGTERM:
1011 case SIGHUP:
1012 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1013 clean_exit(EXIT_FAILURE, "caught deadly signal");
1014 }
1015 }
1016
1017 static void signal_setup_default(struct signal_task *st)
1018 {
1019 st->task.pre_select = signal_pre_select;
1020 st->task.post_select = signal_post_select;
1021 sprintf(st->task.status, "signal task");
1022 }
1023
1024 static void command_pre_select(struct sched *s, struct task *t)
1025 {
1026 struct command_task *ct = container_of(t, struct command_task, task);
1027 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1028 }
1029
1030 static void command_post_select(struct sched *s, struct task *t)
1031 {
1032 int ret;
1033 struct command_task *ct = container_of(t, struct command_task, task);
1034 static struct timeval last_status_dump;
1035 struct timeval tmp, delay = {0, 500 * 1000};
1036
1037 tv_add(&last_status_dump, &delay, &tmp);
1038 if (tv_diff(&tmp, now, NULL) < 0) {
1039 audiod_status_dump();
1040 last_status_dump = *now;
1041 }
1042
1043 ret = handle_connect(ct->fd, &s->rfds);
1044 if (ret < 0)
1045 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1046 audiod_status_dump();
1047 }
1048
1049 static void init_command_task(struct command_task *ct)
1050 {
1051 ct->task.pre_select = command_pre_select;
1052 ct->task.post_select = command_post_select;
1053 ct->task.error = 0;
1054 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1055 sprintf(ct->task.status, "command task");
1056 }
1057
1058 static void close_stat_pipe(void)
1059 {
1060 if (!stat_task->ct)
1061 return;
1062 client_close(stat_task->ct);
1063 stat_task->ct = NULL;
1064 clear_and_dump_items();
1065 stat_task->length_seconds = 0;
1066 stat_task->offset_seconds = 0;
1067 stat_task->vss_status = 0;
1068 stat_task->current_audio_format_num = -1;
1069 audiod_status_dump();
1070 }
1071
1072 /**
1073 * close the connection to para_server and exit
1074 *
1075 * \param status the exit status which is passed to exit(3)
1076 * \param msg the log message
1077 *
1078 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1079 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1080 * EXIT_FAILURE.
1081 *
1082 * \sa exit(3)
1083 */
1084 void __noreturn clean_exit(int status, const char *msg)
1085 {
1086 PARA_EMERG_LOG("%s\n", msg);
1087 if (socket_name)
1088 unlink(socket_name);
1089 close_stat_pipe();
1090 exit(status);
1091 }
1092
1093 /* avoid busy loop if server is down */
1094 static void set_stat_task_restart_barrier(unsigned seconds)
1095 {
1096 struct timeval delay = {seconds, 0};
1097 tv_add(now, &delay, &stat_task->restart_barrier);
1098 }
1099
1100 static void try_to_close_slot(int slot_num)
1101 {
1102 struct slot_info *s = &slot[slot_num];
1103 struct audio_format_info *a = afi + s->format;
1104 int i;
1105
1106 if (s->format < 0)
1107 return;
1108 if (s->receiver_node && s->receiver_node->task.error >= 0)
1109 return;
1110 for (i = 0; i < a->num_filters; i++)
1111 if (s->fns && s->fns[i].task.error >= 0)
1112 return;
1113 if (a->num_writers > 0) {
1114 for (i = 0; i < a->num_writers; i++)
1115 if (s->wns && s->wns[i].task.error >= 0)
1116 return;
1117 } else {
1118 if (s->wns && s->wns[0].task.error >= 0)
1119 return;
1120 }
1121 PARA_INFO_LOG("closing slot %d\n", slot_num);
1122 close_writers(s);
1123 close_filters(s);
1124 close_receiver(slot_num);
1125 clear_slot(slot_num);
1126 }
1127
1128 /*
1129 * Check if any receivers/filters/writers need to be started and do so if
1130 * necessary.
1131 */
1132 static void start_stop_decoders(void)
1133 {
1134 int i, ret;
1135 struct slot_info *sl;
1136 struct audio_format_info *a;
1137
1138 FOR_EACH_SLOT(i)
1139 try_to_close_slot(i);
1140 if (audiod_status != AUDIOD_ON ||
1141 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1142 return kill_all_decoders(-E_NOT_PLAYING);
1143 if (!must_start_decoder())
1144 return;
1145 ret = open_receiver(stat_task->current_audio_format_num);
1146 if (ret < 0) {
1147 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1148 return;
1149 }
1150 sl = slot + ret;
1151 a = afi + sl->format;
1152 if (a->num_filters)
1153 open_filters(sl);
1154 open_writers(sl);
1155 activate_grab_clients(&sched);
1156 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1157 }
1158
1159 static void status_pre_select(struct sched *s, struct task *t)
1160 {
1161 struct status_task *st = container_of(t, struct status_task, task);
1162 int ret, cafn = stat_task->current_audio_format_num;
1163
1164 if (must_start_decoder())
1165 goto min_delay;
1166 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1167 if (ret > 0)
1168 goto min_delay;
1169 if (st->ct && audiod_status == AUDIOD_OFF)
1170 goto min_delay;
1171 if (!st->ct && audiod_status != AUDIOD_OFF)
1172 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1173 if (cafn >= 0)
1174 sched_request_barrier(&afi[cafn].restart_barrier, s);
1175 /*
1176 * If para_server is playing we'd like to have a smooth time display
1177 * even if we are running in standby mode. So we request a timeout that
1178 * expires at the next full second.
1179 */
1180 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1181 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1182 return;
1183 min_delay:
1184 sched_min_delay(s);
1185 }
1186
1187 /* restart the client task if necessary */
1188 static void status_post_select(struct sched *s, struct task *t)
1189 {
1190 struct status_task *st = container_of(t, struct status_task, task);
1191
1192 if (audiod_status == AUDIOD_OFF) {
1193 if (!st->ct)
1194 goto out;
1195 if (st->ct->task.error >= 0) {
1196 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1197 goto out;
1198 }
1199 if (st->ct->task.error >= 0)
1200 goto out;
1201 close_stat_pipe();
1202 st->clock_diff_count = conf.clock_diff_count_arg;
1203 goto out;
1204 }
1205 if (st->ct) {
1206 char *buf;
1207 size_t sz;
1208 int ret;
1209 if (st->ct->task.error < 0) {
1210 if (st->ct->task.error >= 0)
1211 goto out;
1212 close_stat_pipe();
1213 goto out;
1214 }
1215 if (st->ct->status != CL_RECEIVING)
1216 goto out;
1217 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1218 if (ret <= 0) {
1219 struct timeval diff;
1220 tv_diff(now, &st->last_status_read, &diff);
1221 if (diff.tv_sec > 61)
1222 kill_btrn(st->ct->btrn, &st->ct->task,
1223 -E_STATUS_TIMEOUT);
1224 goto out;
1225 }
1226 btr_merge(st->btrn, st->min_iqs);
1227 sz = btr_next_buffer(st->btrn, &buf);
1228 ret = for_each_stat_item(buf, sz, update_item);
1229 if (ret < 0) {
1230 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1231 goto out;
1232 }
1233 if (sz != ret) {
1234 btr_consume(st->btrn, sz - ret);
1235 st->last_status_read = *now;
1236 st->min_iqs = 0;
1237 } else /* current status item crosses buffers */
1238 st->min_iqs = sz + 1;
1239 goto out;
1240 }
1241 btr_drain(st->btrn);
1242 st->current_audio_format_num = -1;
1243 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1244 goto out;
1245 if (st->clock_diff_count) { /* get status only one time */
1246 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1247 int argc = 5;
1248 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1249 st->clock_diff_count--;
1250 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1251 set_stat_task_restart_barrier(2);
1252
1253 } else {
1254 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1255 int argc = 4;
1256 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1257 set_stat_task_restart_barrier(5);
1258 }
1259 free(stat_item_values[SI_BASENAME]);
1260 stat_item_values[SI_BASENAME] = para_strdup(
1261 "no connection to para_server");
1262 stat_client_write_item(SI_BASENAME);
1263 st->last_status_read = *now;
1264 out:
1265 start_stop_decoders();
1266 }
1267
1268 static void init_status_task(struct status_task *st)
1269 {
1270 memset(st, 0, sizeof(struct status_task));
1271 st->task.pre_select = status_pre_select;
1272 st->task.post_select = status_post_select;
1273 st->sa_time_diff_sign = 1;
1274 st->clock_diff_count = conf.clock_diff_count_arg;
1275 st->current_audio_format_num = -1;
1276 sprintf(st->task.status, "stat");
1277 st->btrn = btr_new_node(&(struct btr_node_description)
1278 EMBRACE(.name = "stat"));
1279 }
1280
1281 static void set_initial_status(void)
1282 {
1283 audiod_status = AUDIOD_ON;
1284 if (!conf.mode_given)
1285 return;
1286 if (!strcmp(conf.mode_arg, "sb")) {
1287 audiod_status = AUDIOD_STANDBY;
1288 return;
1289 }
1290 if (!strcmp(conf.mode_arg, "off")) {
1291 audiod_status = AUDIOD_OFF;
1292 return;
1293 }
1294 if (strcmp(conf.mode_arg, "on"))
1295 PARA_WARNING_LOG("invalid mode\n");
1296 }
1297
1298 __noreturn static void print_help_and_die(void)
1299 {
1300 int d = conf.detailed_help_given;
1301 const char **p = d? audiod_args_info_detailed_help
1302 : audiod_args_info_help;
1303
1304 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1305 AUDIOD_CMDLINE_PARSER_VERSION);
1306 printf_or_die("%s\n\n", audiod_args_info_usage);
1307 for (; *p; p++)
1308 printf_or_die("%s\n", *p);
1309 print_receiver_helps(d);
1310 print_filter_helps(d);
1311 print_writer_helps(d);
1312 exit(0);
1313 }
1314
1315 static void init_colors_or_die(void)
1316 {
1317 int i;
1318
1319 if (!want_colors())
1320 return;
1321 daemon_set_default_log_colors();
1322 daemon_set_flag(DF_COLOR_LOG);
1323 for (i = 0; i < conf.log_color_given; i++)
1324 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1325 }
1326
1327 /**
1328 * the main function of para_audiod
1329 *
1330 * \param argc usual argument count
1331 * \param argv usual argument vector
1332 *
1333 * \return EXIT_SUCCESS or EXIT_FAILURE
1334 *
1335 * \sa para_audiod(1)
1336 * */
1337 int main(int argc, char *argv[])
1338 {
1339 int ret, i;
1340 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1341 struct audiod_cmdline_parser_params params = {
1342 .override = 0,
1343 .initialize = 1,
1344 .check_required = 0,
1345 .check_ambiguity = 0,
1346 .print_errors = 1
1347 };
1348
1349 valid_fd_012();
1350 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1351 exit(EXIT_FAILURE);
1352 HANDLE_VERSION_FLAG("audiod", conf);
1353 /* init receivers/filters/writers early to make help work */
1354 recv_init();
1355 filter_init();
1356 writer_init();
1357 if (conf.help_given || conf.detailed_help_given)
1358 print_help_and_die();
1359 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1360 parse_config_or_die();
1361 init_colors_or_die();
1362 init_random_seed_or_die();
1363 daemon_set_flag(DF_LOG_TIME);
1364 daemon_set_flag(DF_LOG_HOSTNAME);
1365 daemon_set_flag(DF_LOG_LL);
1366 if (conf.log_timing_given)
1367 daemon_set_flag(DF_LOG_TIMING);
1368 if (conf.logfile_given) {
1369 daemon_set_logfile(conf.logfile_arg);
1370 daemon_open_log_or_die();
1371 }
1372 ret = parse_stream_args();
1373 if (ret < 0) {
1374 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1375 exit(EXIT_FAILURE);
1376 }
1377 log_welcome("para_audiod");
1378 set_server_start_time(NULL);
1379 set_initial_status();
1380 FOR_EACH_SLOT(i)
1381 clear_slot(i);
1382 setup_signal_handling();
1383 signal_setup_default(sig_task);
1384
1385 init_status_task(stat_task);
1386 init_command_task(cmd_task);
1387
1388 if (conf.daemon_given)
1389 daemonize(false /* parent exits immediately */);
1390
1391 register_task(&sched, &sig_task->task);
1392 register_task(&sched, &cmd_task->task);
1393 register_task(&sched, &stat_task->task);
1394 sched.default_timeout.tv_sec = 2;
1395 sched.default_timeout.tv_usec = 999 * 1000;
1396 ret = schedule(&sched);
1397
1398 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1399 return EXIT_FAILURE;
1400 }