Replace direct use of RC4 by stream cipher abstraction.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2011 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 <dirent.h>
11 #include <signal.h>
12 #include <stdbool.h>
13
14 #include "para.h"
15 #include "error.h"
16 #include "crypt.h"
17 #include "audiod.cmdline.h"
18 #include "list.h"
19 #include "sched.h"
20 #include "ggo.h"
21 #include "recv.h"
22 #include "buffer_tree.h"
23 #include "filter.h"
24 #include "grab_client.h"
25 #include "client.cmdline.h"
26 #include "client.h"
27 #include "audiod.h"
28 #include "net.h"
29 #include "daemon.h"
30 #include "string.h"
31 #include "fd.h"
32 #include "write.h"
33 #include "write_common.h"
34 #include "signal.h"
35
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 task for obtaining para_server's status (para_client stat).
82 *
83 * \sa struct task, struct sched.
84 */
85 struct status_task {
86 /** The associated task structure of audiod. */
87 struct task task;
88 /** Client data associated with the stat task. */
89 struct client_task *ct;
90 /** Do not restart client command until this time. */
91 struct timeval restart_barrier;
92 /** Last time we received status data from para_server. */
93 struct timeval last_status_read;
94 size_t min_iqs;
95 /** The offset value announced by para_server. */
96 int offset_seconds;
97 /** The length of the current audio file as announced by para_server. */
98 int length_seconds;
99 /** The start of the current stream from the view of para_server. */
100 struct timeval server_stream_start;
101 /** The average time deviation between para_server and para_audiod. */
102 struct timeval sa_time_diff;
103 /** Whether client time is ahead of server time. */
104 int sa_time_diff_sign;
105 /** The 'P' and the 'N' flags as announced by para_server. */
106 enum vss_status_flags vss_status;
107 /** Number of times the clock difference is to be checked. */
108 unsigned clock_diff_count;
109 /** When to start the next check for clock difference. */
110 struct timeval clock_diff_barrier;
111 /** Number of the audio format as announced by para_server. */
112 int current_audio_format_num;
113 /* The status task btrn is the child of the client task. */
114 struct btr_node *btrn;
115 };
116
117 /** The array of status items sent by para_server. */
118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
119
120 /**
121 * the current mode of operation of which can be changed by the on/off/cycle
122 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
123 */
124 int audiod_status = AUDIOD_ON;
125
126 /**
127 * the gengetopt args_info struct that holds information on all command line
128 * arguments
129 */
130 struct audiod_args_info conf;
131
132 static char *socket_name;
133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
134
135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
136
137 static struct status_task status_task_struct;
138
139 /**
140 * the task that calls the status command of para_server
141 *
142 * \sa struct status_task
143 */
144 static struct status_task *stat_task = &status_task_struct;
145
146 /**
147 * the task for handling audiod commands
148 *
149 * \sa struct task, struct sched
150 */
151 struct command_task {
152 /** the local listening socket */
153 int fd;
154 /** the associated task structure */
155 struct task task;
156 };
157
158 /** iterate over all supported audio formats */
159 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
160
161 /**
162 * Get the audio format number.
163 *
164 * \param name The name of the audio format.
165 *
166 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
167 * \a name is not a supported audio format.
168 */
169 static int get_audio_format_num(const char *name)
170 {
171 int i;
172
173 while (para_isspace(*name))
174 name++;
175 FOR_EACH_AUDIO_FORMAT(i)
176 if (!strcmp(name, audio_formats[i]))
177 return i;
178 return -E_UNSUPPORTED_AUDIO_FORMAT;
179 }
180
181 /**
182 * Compute the play time based on information of the given slot.
183 *
184 * \param slot_num The slot number (negative means: no slot).
185 *
186 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
187 * from the status items received from para_server and the start time of the
188 * (first) writer of the given slot.
189 *
190 * It has to to take into account that probably the stream was not started at
191 * the beginning of the file, that the clock between the server and the client
192 * host may differ and that playback of the stream was delayed, e.g. because
193 * the prebuffer filter is used in the filter configuration of the given slot.
194 *
195 * If no writer is active in the given slot, or \a slot_num is negative
196 * (indicating that para_audiod runs in standby mode), an approximation based
197 * only on the status items is computed and the returned string is prefixed
198 * with "~".
199 *
200 * \return A string that must be freed by the caller.
201 */
202 char *get_time_string(int slot_num)
203 {
204 int ret, seconds = 0, length;
205 struct timeval *tmp, sum, sss, /* server stream start */
206 rstime, /* receiver start time */
207 wstime, /* writer start time */
208 wtime, /* now - writer start */
209 rskip; /* receiver start - sss */
210 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
211 char *msg;
212
213 if (audiod_status == AUDIOD_OFF)
214 goto empty;
215 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
216 if (stat_task->length_seconds) /* paused */
217 return NULL;
218 goto empty; /* stopped */
219 }
220 if (audiod_status == AUDIOD_ON && !s)
221 goto empty;
222 /*
223 * Valid status items and playing, set length and tmp to the stream
224 * start. We use the slot info and fall back to the info from current
225 * status items if no slot info is available.
226 */
227 length = stat_task->length_seconds;
228 tmp = &stat_task->server_stream_start;
229 if (s && s->wns) { /* writer active in this slot */
230 btr_get_node_start(s->wns[0].btrn, &wstime);
231 if (wstime.tv_sec != 0) { /* writer wrote something */
232 if (s->server_stream_start.tv_sec == 0) {
233 /* copy status info to slot */
234 s->server_stream_start = stat_task->server_stream_start;
235 s->offset_seconds = stat_task->offset_seconds;
236 s->seconds_total = stat_task->length_seconds;
237 }
238 length = s->seconds_total;
239 tmp = &s->server_stream_start;
240 }
241 }
242 if (stat_task->sa_time_diff_sign > 0)
243 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
244 else
245 tv_add(tmp, &stat_task->sa_time_diff, &sss);
246 if (!s || !s->wns) {
247 struct timeval diff;
248 tv_diff(now, &sss, &diff);
249 seconds = diff.tv_sec + stat_task->offset_seconds;
250 goto out;
251 }
252 tv_diff(now, &wstime, &wtime);
253 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
254 seconds = s->offset_seconds;
255 btr_get_node_start(s->receiver_node->btrn, &rstime);
256 ret = tv_diff(&rstime, &sss, &rskip);
257 if (ret > 0) { /* audiod was started in the middle of the stream */
258 tv_add(&wtime, &rskip, &sum);
259 seconds += sum.tv_sec;
260 } else
261 seconds += wtime.tv_sec;
262 out:
263 seconds = PARA_MIN(seconds, length);
264 seconds = PARA_MAX(seconds, 0);
265 msg = make_message(
266 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
267 s? "" : "~",
268 seconds / 60,
269 seconds % 60,
270 (length - seconds) / 60,
271 (length - seconds) % 60,
272 length? (seconds * 100 + length / 2) / length : 0,
273 length / 60,
274 length % 60
275 );
276 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
277 return msg;
278 empty:
279 return para_strdup(NULL);
280 }
281
282 static int want_colors(void)
283 {
284 if (conf.color_arg == color_arg_no)
285 return 0;
286 if (conf.color_arg == color_arg_yes)
287 return 1;
288 if (conf.logfile_given)
289 return 0;
290 return isatty(STDERR_FILENO);
291 }
292
293 static void parse_config_or_die(void)
294 {
295 int ret;
296 char *config_file;
297 struct audiod_cmdline_parser_params params = {
298 .override = 0,
299 .initialize = 0,
300 .check_required = 1,
301 .check_ambiguity = 0,
302 .print_errors = 1
303 };
304
305 if (conf.config_file_given)
306 config_file = para_strdup(conf.config_file_arg);
307 else {
308 char *home = para_homedir();
309 config_file = make_message("%s/.paraslash/audiod.conf", home);
310 free(home);
311 }
312 ret = file_exists(config_file);
313 if (conf.config_file_given && !ret) {
314 PARA_EMERG_LOG("can not read config file %s\n", config_file);
315 goto err;
316 }
317 if (ret)
318 audiod_cmdline_parser_config_file(config_file, &conf, &params);
319 free(config_file);
320 daemon_set_loglevel(conf.loglevel_arg);
321 return;
322 err:
323 free(config_file);
324 exit(EXIT_FAILURE);
325 }
326
327 static void setup_signal_handling(void)
328 {
329 sig_task->fd = para_signal_init();
330 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
331 para_install_sighandler(SIGINT);
332 para_install_sighandler(SIGTERM);
333 para_install_sighandler(SIGHUP);
334 para_sigaction(SIGPIPE, SIG_IGN);
335 }
336
337 static void clear_slot(int slot_num)
338 {
339 struct slot_info *s = &slot[slot_num];
340
341 PARA_INFO_LOG("clearing slot %d\n", slot_num);
342 memset(s, 0, sizeof(struct slot_info));
343 s->format = -1;
344 }
345
346 static void close_receiver(int slot_num)
347 {
348 struct slot_info *s = &slot[slot_num];
349 struct audio_format_info *a;
350
351 if (s->format < 0 || !s->receiver_node)
352 return;
353 a = &afi[s->format];
354 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
355 audio_formats[s->format], slot_num);
356 a->receiver->close(s->receiver_node);
357 btr_free_node(s->receiver_node->btrn);
358 free(s->receiver_node);
359 s->receiver_node = NULL;
360 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
361 &a->restart_barrier);
362 }
363
364 static void writer_cleanup(struct writer_node *wn)
365 {
366 struct writer *w;
367
368 if (!wn)
369 return;
370 w = writers + wn->writer_num;
371 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
372 w->close(wn);
373 btr_free_node(wn->btrn);
374 }
375
376 static void close_writers(struct slot_info *s)
377 {
378 struct audio_format_info *a;
379 int i;
380
381 if (s->format < 0)
382 return;
383 assert(s->wns);
384 a = afi + s->format;
385 if (a->num_writers == 0)
386 writer_cleanup(s->wns);
387 else {
388 for (i = 0; i < a->num_writers; i++)
389 writer_cleanup(s->wns + i);
390 }
391 free(s->wns);
392 s->wns = NULL;
393 }
394
395 static void close_filters(struct slot_info *s)
396 {
397 int i;
398 struct audio_format_info *a = afi + s->format;
399 if (a->num_filters == 0)
400 return;
401 for (i = 0; i < a->num_filters; i++) {
402 struct filter_node *fn = s->fns + i;
403 struct filter *f;
404
405 if (!fn)
406 continue;
407 f = filters + fn->filter_num;
408 if (f->close)
409 f->close(fn);
410 btr_free_node(fn->btrn);
411 }
412 free(s->fns);
413 s->fns = NULL;
414 }
415
416 /*
417 * Whenever a task commits suicide by returning from post_select with t->error
418 * < 0, it also removes its btr node. We do exactly that to kill a running
419 * task. Note that the scheduler checks t->error also _before_ each pre/post
420 * select call, so the victim will never be scheduled again.
421 */
422 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
423 {
424 if (t->error < 0)
425 return;
426 t->error = error;
427 btr_remove_node(btrn);
428 }
429
430 static void kill_all_decoders(int error)
431 {
432 int i, j;
433
434 FOR_EACH_SLOT(i) {
435 struct slot_info *s = &slot[i];
436 struct audio_format_info *a;
437 if (s->format < 0)
438 continue;
439 a = afi + s->format;
440 if (s->wns)
441 for (j = 0; j < a->num_writers; j++)
442 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
443 if (s->fns)
444 for (j = 0; j < a->num_writers; j++)
445 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
446 if (s->receiver_node)
447 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
448 error);
449 }
450 }
451
452 static int get_empty_slot(void)
453 {
454 int i;
455 struct slot_info *s;
456
457 FOR_EACH_SLOT(i) {
458 s = &slot[i];
459 if (s->format < 0) {
460 clear_slot(i);
461 return i;
462 }
463 if (s->wns || s->receiver_node || s->fns)
464 continue;
465 clear_slot(i);
466 return i;
467 }
468 return -E_NO_MORE_SLOTS;
469 }
470
471 static void open_filters(struct slot_info *s)
472 {
473 struct audio_format_info *a = afi + s->format;
474 struct filter_node *fn;
475 int nf = a->num_filters;
476 struct btr_node *parent;
477 int i;
478
479 if (nf == 0)
480 return;
481 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
482 assert(s->fns == NULL);
483 s->fns = para_calloc(nf * sizeof(struct filter_node));
484 parent = s->receiver_node->btrn;
485 for (i = 0; i < nf; i++) {
486 struct filter *f = filters + a->filter_nums[i];
487 fn = s->fns + i;
488 fn->filter_num = a->filter_nums[i];
489 fn->conf = a->filter_conf[i];
490 fn->task.pre_select = f->pre_select;
491 fn->task.post_select = f->post_select;
492
493 fn->btrn = btr_new_node(&(struct btr_node_description)
494 EMBRACE(.name = f->name, .parent = parent,
495 .handler = f->execute, .context = fn));
496
497 f->open(fn);
498 register_task(&fn->task);
499 parent = fn->btrn;
500 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
501 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
502 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
503 }
504 }
505
506 static void open_writers(struct slot_info *s)
507 {
508 int i;
509 struct audio_format_info *a = afi + s->format;
510 struct writer_node *wn;
511 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
512
513 assert(s->wns == NULL);
514 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
515 * sizeof(struct writer_node));
516 if (a->num_writers == 0)
517 setup_writer_node(NULL, parent, s->wns);
518 else {
519 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
520 for (i = 0; i < a->num_writers; i++) {
521 wn = s->wns + i;
522 wn->conf = a->writer_conf[i];
523 wn->writer_num = a->writer_nums[i];
524 register_writer_node(wn, parent);
525 }
526 }
527 }
528
529 /* returns slot num on success */
530 static int open_receiver(int format)
531 {
532 struct audio_format_info *a = &afi[format];
533 struct slot_info *s;
534 int ret, slot_num;
535 struct receiver *r = a->receiver;
536 struct receiver_node *rn;
537
538 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
539 ret = get_empty_slot();
540 if (ret < 0)
541 return ret;
542 slot_num = ret;
543 rn = para_calloc(sizeof(*rn));
544 rn->receiver = r;
545 rn->conf = a->receiver_conf;
546 rn->btrn = btr_new_node(&(struct btr_node_description)
547 EMBRACE(.name = r->name, .context = rn));
548 ret = r->open(rn);
549 if (ret < 0) {
550 btr_free_node(rn->btrn);
551 free(rn);
552 return ret;
553 }
554 s = &slot[slot_num];
555 s->format = format;
556 s->receiver_node = rn;
557 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
558 audio_formats[format], r->name, slot_num);
559 rn->task.pre_select = r->pre_select;
560 rn->task.post_select = r->post_select;
561 sprintf(rn->task.status, "%s receiver node", r->name);
562 register_task(&rn->task);
563 return slot_num;
564 }
565
566 static bool receiver_running(void)
567 {
568 int i;
569 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
570
571 FOR_EACH_SLOT(i) {
572 struct slot_info *s = &slot[i];
573 long unsigned ss2 = s->server_stream_start.tv_sec;
574
575 if (!s->receiver_node)
576 continue;
577 if (s->receiver_node->task.error >= 0)
578 return true;
579 if (ss1 == ss2)
580 return true;
581 }
582 return false;
583 }
584
585 /**
586 * Return the root node of the current buffer tree.
587 *
588 * This is only used for stream grabbing.
589 *
590 * \return \p NULL if no slot is currently active. If more than one buffer tree
591 * exists, the node corresponding to the most recently started receiver is
592 * returned.
593 */
594 struct btr_node *audiod_get_btr_root(void)
595 {
596 int i, newest_slot = -1;
597 struct timeval newest_rstime = {0, 0};
598
599 FOR_EACH_SLOT(i) {
600 struct slot_info *s = &slot[i];
601 struct timeval rstime;
602 if (!s->receiver_node)
603 continue;
604 if (s->receiver_node->task.error < 0)
605 continue;
606 btr_get_node_start(s->receiver_node->btrn, &rstime);
607 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
608 continue;
609 newest_rstime = rstime;
610 newest_slot = i;
611 }
612 if (newest_slot == -1)
613 return NULL;
614 return slot[newest_slot].receiver_node->btrn;
615 }
616
617 /* whether a new instance of a decoder should be started. */
618 static bool must_start_decoder(void)
619 {
620 int cafn = stat_task->current_audio_format_num;
621 unsigned vs = stat_task->vss_status;
622
623 if (audiod_status != AUDIOD_ON)
624 return false;
625 if (cafn < 0)
626 return false;
627 if (!stat_task->ct)
628 return false;
629 if (vs & VSS_STATUS_FLAG_NEXT)
630 return false;
631 if (!(vs & VSS_STATUS_FLAG_PLAYING))
632 return false;
633 if (receiver_running())
634 return false;
635 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
636 return false;
637 return true;
638 }
639
640 static unsigned compute_time_diff(const struct timeval *status_time)
641 {
642 struct timeval tmp, diff;
643 static unsigned count;
644 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
645 const struct timeval max_deviation = {0, 500 * 1000};
646 const int time_smooth = 5;
647
648 if (!status_time)
649 return count;
650 sign = tv_diff(status_time, now, &diff);
651 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
652 // sign, sa_time_diff_sign);
653 if (!count) {
654 sa_time_diff_sign = sign;
655 stat_task->sa_time_diff = diff;
656 count++;
657 goto out;
658 }
659 if (count > 5) {
660 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
661 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
662 PARA_WARNING_LOG("time diff jump: %lims\n",
663 s * tv2ms(&tmp));
664 }
665 count++;
666 sa_time_diff_sign = tv_convex_combination(
667 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
668 count > 10? sign : sign * time_smooth, &diff,
669 &tmp);
670 stat_task->sa_time_diff = tmp;
671 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
672 sign < 0? "-" : "+",
673 tv2ms(&diff),
674 sa_time_diff_sign < 0? "-" : "+",
675 tv2ms(&stat_task->sa_time_diff)
676 );
677 out:
678 stat_task->sa_time_diff_sign = sa_time_diff_sign;
679 return count;
680 }
681
682 static int update_item(int itemnum, char *buf)
683 {
684 long unsigned sec, usec;
685
686 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
687 return 1;
688 free(stat_item_values[itemnum]);
689 stat_item_values[itemnum] = para_strdup(buf);
690 stat_client_write_item(itemnum);
691 switch (itemnum) {
692 case SI_STATUS_FLAGS:
693 stat_task->vss_status = 0;
694 if (strchr(buf, 'N'))
695 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
696 if (strchr(buf, 'P'))
697 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
698 break;
699 case SI_OFFSET:
700 stat_task->offset_seconds = atoi(buf);
701 break;
702 case SI_SECONDS_TOTAL:
703 stat_task->length_seconds = atoi(buf);
704 break;
705 case SI_STREAM_START:
706 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
707 stat_task->server_stream_start.tv_sec = sec;
708 stat_task->server_stream_start.tv_usec = usec;
709 }
710 break;
711 case SI_CURRENT_TIME:
712 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
713 struct timeval tv = {sec, usec};
714 compute_time_diff(&tv);
715 }
716 break;
717 case SI_FORMAT:
718 stat_task->current_audio_format_num
719 = get_audio_format_num(buf);
720 }
721 return 1;
722 }
723
724 static int parse_stream_command(const char *txt, char **cmd)
725 {
726 char *p = strchr(txt, ':');
727 int i;
728
729 if (!p)
730 return -E_MISSING_COLON;
731 p++;
732 FOR_EACH_AUDIO_FORMAT(i) {
733 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
734 continue;
735 *cmd = p;
736 return i;
737 }
738 return -E_UNSUPPORTED_AUDIO_FORMAT;
739 }
740
741 static int add_filter(int format, char *cmdline)
742 {
743 struct audio_format_info *a = &afi[format];
744 int filter_num, nf = a->num_filters;
745
746 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
747 if (filter_num < 0)
748 return filter_num;
749 a->filter_nums[nf] = filter_num;
750 a->num_filters++;
751 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
752 filters[filter_num].name);
753 return filter_num;
754 }
755
756 static int parse_writer_args(void)
757 {
758 int i, ret, nw;
759 char *cmd;
760 struct audio_format_info *a;
761
762 nw = PARA_MAX(1U, conf.writer_given);
763 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
764 FOR_EACH_AUDIO_FORMAT(i) {
765 a = &afi[i];
766 a->writer_conf = para_malloc(nw * sizeof(void *));
767 a->writer_nums = para_malloc(nw * sizeof(int));
768 a->num_writers = 0;
769 }
770 for (i = 0; i < conf.writer_given; i++) {
771 void *wconf;
772 int writer_num;
773 ret = parse_stream_command(conf.writer_arg[i], &cmd);
774 if (ret < 0)
775 goto out;
776 a = &afi[ret];
777 nw = a->num_writers;
778 wconf = check_writer_arg(cmd, &writer_num);
779 if (!wconf) {
780 ret = writer_num;
781 goto out;
782 }
783 a->writer_nums[nw] = writer_num;
784 a->writer_conf[nw] = wconf;
785 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
786 nw, writer_names[writer_num]);
787 a->num_writers++;
788 }
789 ret = 1;
790 out:
791 return ret;
792 }
793
794 static int parse_receiver_args(void)
795 {
796 int i, ret, receiver_num;
797 char *cmd = NULL;
798 struct audio_format_info *a;
799
800 for (i = conf.receiver_given - 1; i >= 0; i--) {
801 char *arg = conf.receiver_arg[i];
802 char *recv_arg = strchr(arg, ':');
803 ret = -E_MISSING_COLON;
804 if (!recv_arg)
805 goto out;
806 *recv_arg = '\0';
807 recv_arg++;
808 ret = get_audio_format_num(arg);
809 if (ret < 0)
810 goto out;
811 /*
812 * If multiple receivers are given for this audio format, the
813 * last one wins and we have to free the previous receiver
814 * config here. Since we are iterating backwards, the winning
815 * receiver arg is in fact the first one given.
816 */
817 if (afi[ret].receiver_conf)
818 afi[ret].receiver->free_config(afi[ret].receiver_conf);
819 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
820 if (!afi[ret].receiver_conf) {
821 ret = -E_RECV_SYNTAX;
822 goto out;
823 }
824 afi[ret].receiver = &receivers[receiver_num];
825 }
826 /*
827 * Use the first available receiver with no arguments for those audio
828 * formats for which no receiver was specified.
829 */
830 cmd = para_strdup(receivers[0].name);
831 FOR_EACH_AUDIO_FORMAT(i) {
832 a = &afi[i];
833 if (a->receiver_conf)
834 continue;
835 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
836 if (!a->receiver_conf)
837 return -E_RECV_SYNTAX;
838 a->receiver = &receivers[receiver_num];
839 }
840 ret = 1;
841 out:
842 free(cmd);
843 return ret;
844 }
845
846 static int init_default_filters(void)
847 {
848 int i, ret = 1;
849
850 FOR_EACH_AUDIO_FORMAT(i) {
851 struct audio_format_info *a = &afi[i];
852 char *tmp;
853 int j;
854
855 if (a->num_filters)
856 continue; /* no default -- nothing to to */
857 /*
858 * If udp is used to receive this audiod format, add fecdec as
859 * the first filter.
860 */
861 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
862 strcmp(afi[i].receiver->name, "dccp") == 0) {
863 tmp = para_strdup("fecdec");
864 add_filter(i, tmp);
865 free(tmp);
866 if (ret < 0)
867 goto out;
868 }
869 /* add "dec" to audio format name */
870 tmp = make_message("%sdec", audio_formats[i]);
871 for (j = 0; filters[j].name; j++)
872 if (!strcmp(tmp, filters[j].name))
873 break;
874 free(tmp);
875 ret = -E_UNSUPPORTED_FILTER;
876 if (!filters[j].name)
877 goto out;
878 tmp = para_strdup(filters[j].name);
879 ret = add_filter(i, tmp);
880 free(tmp);
881 if (ret < 0)
882 goto out;
883 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
884 filters[j].name);
885 }
886 out:
887 return ret;
888 }
889
890 static int parse_filter_args(void)
891 {
892 int i, ret, nf;
893
894 nf = PARA_MAX(2U, conf.filter_given);
895 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
896 FOR_EACH_AUDIO_FORMAT(i) {
897 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
898 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
899 }
900 if (!conf.no_default_filters_given)
901 return init_default_filters();
902 for (i = 0; i < conf.filter_given; i++) {
903 char *arg = conf.filter_arg[i];
904 char *filter_name = strchr(arg, ':');
905 ret = -E_MISSING_COLON;
906 if (!filter_name)
907 goto out;
908 *filter_name = '\0';
909 filter_name++;
910 ret = get_audio_format_num(arg);
911 if (ret < 0)
912 goto out;
913 ret = add_filter(ret, filter_name);
914 if (ret < 0)
915 goto out;
916 }
917 ret = init_default_filters(); /* use default values for the rest */
918 out:
919 return ret;
920 }
921
922 static int parse_stream_args(void)
923 {
924 int ret;
925
926 ret = parse_receiver_args();
927 if (ret < 0)
928 return ret;
929 ret = parse_filter_args();
930 if (ret < 0)
931 return ret;
932 ret = parse_writer_args();
933 if (ret < 0)
934 return ret;
935 return 1;
936 }
937
938 /* does not unlink socket on errors */
939 static int audiod_get_socket(void)
940 {
941 struct sockaddr_un unix_addr;
942 int ret, fd;
943
944 if (conf.socket_given)
945 socket_name = para_strdup(conf.socket_arg);
946 else {
947 char *hn = para_hostname();
948 socket_name = make_message("/var/paraslash/audiod_socket.%s",
949 hn);
950 free(hn);
951 }
952 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
953 if (conf.force_given)
954 unlink(socket_name);
955 ret = create_local_socket(socket_name, &unix_addr,
956 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
957 if (ret < 0)
958 goto err;
959 fd = ret;
960 if (listen(fd , 5) < 0) {
961 ret = -ERRNO_TO_PARA_ERROR(errno);
962 goto err;
963 }
964 ret = mark_fd_nonblocking(fd);
965 if (ret < 0)
966 goto err;
967 return fd;
968 err:
969 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
970 exit(EXIT_FAILURE);
971 }
972
973 static void signal_pre_select(struct sched *s, struct task *t)
974 {
975 struct signal_task *st = container_of(t, struct signal_task, task);
976 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
977 }
978
979 static void signal_post_select(struct sched *s, __a_unused struct task *t)
980 {
981 int signum;
982
983 signum = para_next_signal(&s->rfds);
984 switch (signum) {
985 case SIGINT:
986 case SIGTERM:
987 case SIGHUP:
988 PARA_EMERG_LOG("terminating on signal %d\n", signum);
989 clean_exit(EXIT_FAILURE, "caught deadly signal");
990 }
991 }
992
993 static void signal_setup_default(struct signal_task *st)
994 {
995 st->task.pre_select = signal_pre_select;
996 st->task.post_select = signal_post_select;
997 sprintf(st->task.status, "signal task");
998 }
999
1000 static void command_pre_select(struct sched *s, struct task *t)
1001 {
1002 struct command_task *ct = container_of(t, struct command_task, task);
1003 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1004 }
1005
1006 static void command_post_select(struct sched *s, struct task *t)
1007 {
1008 int ret;
1009 struct command_task *ct = container_of(t, struct command_task, task);
1010 static struct timeval last_status_dump;
1011 struct timeval tmp, delay = {0, 500 * 1000};
1012
1013 tv_add(&last_status_dump, &delay, &tmp);
1014 if (tv_diff(&tmp, now, NULL) < 0) {
1015 audiod_status_dump();
1016 last_status_dump = *now;
1017 }
1018
1019 ret = handle_connect(ct->fd, &s->rfds);
1020 if (ret < 0)
1021 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1022 audiod_status_dump();
1023 }
1024
1025 static void init_command_task(struct command_task *ct)
1026 {
1027 ct->task.pre_select = command_pre_select;
1028 ct->task.post_select = command_post_select;
1029 ct->task.error = 0;
1030 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1031 sprintf(ct->task.status, "command task");
1032 }
1033
1034 static void close_stat_pipe(void)
1035 {
1036 if (!stat_task->ct)
1037 return;
1038 btr_free_node(stat_task->ct->btrn);
1039 client_close(stat_task->ct);
1040 stat_task->ct = NULL;
1041 clear_and_dump_items();
1042 stat_task->length_seconds = 0;
1043 stat_task->offset_seconds = 0;
1044 stat_task->vss_status = 0;
1045 stat_task->current_audio_format_num = -1;
1046 audiod_status_dump();
1047 }
1048
1049 /**
1050 * close the connection to para_server and exit
1051 *
1052 * \param status the exit status which is passed to exit(3)
1053 * \param msg the log message
1054 *
1055 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1056 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1057 * EXIT_FAILURE.
1058 *
1059 * \sa exit(3)
1060 */
1061 void __noreturn clean_exit(int status, const char *msg)
1062 {
1063 PARA_EMERG_LOG("%s\n", msg);
1064 if (socket_name)
1065 unlink(socket_name);
1066 close_stat_pipe();
1067 exit(status);
1068 }
1069
1070 /* avoid busy loop if server is down */
1071 static void set_stat_task_restart_barrier(unsigned seconds)
1072 {
1073 struct timeval delay = {seconds, 0};
1074 tv_add(now, &delay, &stat_task->restart_barrier);
1075 }
1076
1077 static void try_to_close_slot(int slot_num)
1078 {
1079 struct slot_info *s = &slot[slot_num];
1080 struct audio_format_info *a = afi + s->format;
1081 int i;
1082
1083 if (s->format < 0)
1084 return;
1085 if (s->receiver_node && s->receiver_node->task.error >= 0)
1086 return;
1087 for (i = 0; i < a->num_filters; i++)
1088 if (s->fns && s->fns[i].task.error >= 0)
1089 return;
1090 if (a->num_writers > 0) {
1091 for (i = 0; i < a->num_writers; i++)
1092 if (s->wns && s->wns[i].task.error >= 0)
1093 return;
1094 } else {
1095 if (s->wns && s->wns[0].task.error >= 0)
1096 return;
1097 }
1098 PARA_INFO_LOG("closing slot %d\n", slot_num);
1099 close_writers(s);
1100 close_filters(s);
1101 close_receiver(slot_num);
1102 clear_slot(slot_num);
1103 }
1104
1105 /*
1106 * Check if any receivers/filters/writers need to be started and do so if
1107 * necessary.
1108 */
1109 static void start_stop_decoders(void)
1110 {
1111 int i, ret;
1112 struct slot_info *sl;
1113 struct audio_format_info *a;
1114
1115 FOR_EACH_SLOT(i)
1116 try_to_close_slot(i);
1117 if (audiod_status != AUDIOD_ON ||
1118 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1119 return kill_all_decoders(-E_NOT_PLAYING);
1120 if (!must_start_decoder())
1121 return;
1122 ret = open_receiver(stat_task->current_audio_format_num);
1123 if (ret < 0) {
1124 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1125 return;
1126 }
1127 sl = slot + ret;
1128 a = afi + sl->format;
1129 if (a->num_filters)
1130 open_filters(sl);
1131 open_writers(sl);
1132 activate_grab_clients();
1133 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1134 }
1135
1136 static void status_pre_select(struct sched *s, struct task *t)
1137 {
1138 struct status_task *st = container_of(t, struct status_task, task);
1139 int ret, cafn = stat_task->current_audio_format_num;
1140
1141 if (must_start_decoder())
1142 goto min_delay;
1143 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1144 if (ret > 0)
1145 goto min_delay;
1146 if (st->ct && audiod_status == AUDIOD_OFF)
1147 goto min_delay;
1148 if (!st->ct && audiod_status != AUDIOD_OFF)
1149 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1150 if (cafn >= 0)
1151 sched_request_barrier(&afi[cafn].restart_barrier, s);
1152 /*
1153 * If para_server is playing we'd like to have a smooth time display
1154 * even if we are running in standby mode. So we request a timeout that
1155 * expires at the next full second.
1156 */
1157 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1158 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1159 return;
1160 min_delay:
1161 sched_min_delay(s);
1162 }
1163
1164 /* restart the client task if necessary */
1165 static void status_post_select(__a_unused struct sched *s, struct task *t)
1166 {
1167 struct status_task *st = container_of(t, struct status_task, task);
1168
1169 if (audiod_status == AUDIOD_OFF) {
1170 if (!st->ct)
1171 goto out;
1172 if (st->ct->task.error >= 0) {
1173 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1174 goto out;
1175 }
1176 if (st->ct->task.error >= 0)
1177 goto out;
1178 close_stat_pipe();
1179 st->clock_diff_count = conf.clock_diff_count_arg;
1180 goto out;
1181 }
1182 if (st->ct) {
1183 char *buf;
1184 size_t sz;
1185 int ret;
1186 if (st->ct->task.error < 0) {
1187 if (st->ct->task.error >= 0)
1188 goto out;
1189 close_stat_pipe();
1190 goto out;
1191 }
1192 if (st->ct->status != CL_RECEIVING)
1193 goto out;
1194 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1195 if (ret <= 0) {
1196 struct timeval diff;
1197 tv_diff(now, &st->last_status_read, &diff);
1198 if (diff.tv_sec > 61)
1199 kill_btrn(st->ct->btrn, &st->ct->task,
1200 -E_STATUS_TIMEOUT);
1201 goto out;
1202 }
1203 btr_merge(st->btrn, st->min_iqs);
1204 sz = btr_next_buffer(st->btrn, &buf);
1205 ret = for_each_stat_item(buf, sz, update_item);
1206 if (ret < 0) {
1207 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1208 goto out;
1209 }
1210 if (sz != ret) {
1211 btr_consume(st->btrn, sz - ret);
1212 st->last_status_read = *now;
1213 st->min_iqs = 0;
1214 } else /* current status item crosses buffers */
1215 st->min_iqs = sz + 1;
1216 goto out;
1217 }
1218 btr_drain(st->btrn);
1219 st->current_audio_format_num = -1;
1220 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1221 goto out;
1222 if (st->clock_diff_count) { /* get status only one time */
1223 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1224 int argc = 5;
1225 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1226 st->clock_diff_count--;
1227 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1228 set_stat_task_restart_barrier(2);
1229
1230 } else {
1231 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1232 int argc = 4;
1233 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1234 set_stat_task_restart_barrier(5);
1235 }
1236 free(stat_item_values[SI_BASENAME]);
1237 stat_item_values[SI_BASENAME] = para_strdup(
1238 "no connection to para_server");
1239 stat_client_write_item(SI_BASENAME);
1240 st->last_status_read = *now;
1241 out:
1242 start_stop_decoders();
1243 }
1244
1245 static void init_status_task(struct status_task *st)
1246 {
1247 memset(st, 0, sizeof(struct status_task));
1248 st->task.pre_select = status_pre_select;
1249 st->task.post_select = status_post_select;
1250 st->sa_time_diff_sign = 1;
1251 st->clock_diff_count = conf.clock_diff_count_arg;
1252 st->current_audio_format_num = -1;
1253 sprintf(st->task.status, "stat");
1254 st->btrn = btr_new_node(&(struct btr_node_description)
1255 EMBRACE(.name = "stat"));
1256 }
1257
1258 static void set_initial_status(void)
1259 {
1260 audiod_status = AUDIOD_ON;
1261 if (!conf.mode_given)
1262 return;
1263 if (!strcmp(conf.mode_arg, "sb")) {
1264 audiod_status = AUDIOD_STANDBY;
1265 return;
1266 }
1267 if (!strcmp(conf.mode_arg, "off")) {
1268 audiod_status = AUDIOD_OFF;
1269 return;
1270 }
1271 if (strcmp(conf.mode_arg, "on"))
1272 PARA_WARNING_LOG("invalid mode\n");
1273 }
1274
1275 __noreturn static void print_help_and_die(void)
1276 {
1277 int d = conf.detailed_help_given;
1278 const char **p = d? audiod_args_info_detailed_help
1279 : audiod_args_info_help;
1280
1281 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1282 AUDIOD_CMDLINE_PARSER_VERSION);
1283 printf_or_die("%s\n\n", audiod_args_info_usage);
1284 for (; *p; p++)
1285 printf_or_die("%s\n", *p);
1286 print_receiver_helps(d);
1287 print_filter_helps(d);
1288 print_writer_helps(d);
1289 exit(0);
1290 }
1291
1292 static void init_colors_or_die(void)
1293 {
1294 int i;
1295
1296 if (!want_colors())
1297 return;
1298 daemon_set_default_log_colors();
1299 daemon_set_flag(DF_COLOR_LOG);
1300 for (i = 0; i < conf.log_color_given; i++)
1301 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1302 }
1303
1304 /**
1305 * the main function of para_audiod
1306 *
1307 * \param argc usual argument count
1308 * \param argv usual argument vector
1309 *
1310 * \return EXIT_SUCCESS or EXIT_FAILURE
1311 *
1312 * \sa para_audiod(1)
1313 * */
1314 int main(int argc, char *argv[])
1315 {
1316 int ret, i;
1317 static struct sched s;
1318 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1319 struct audiod_cmdline_parser_params params = {
1320 .override = 0,
1321 .initialize = 1,
1322 .check_required = 0,
1323 .check_ambiguity = 0,
1324 .print_errors = 1
1325 };
1326
1327 valid_fd_012();
1328 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1329 exit(EXIT_FAILURE);
1330 HANDLE_VERSION_FLAG("audiod", conf);
1331 /* init receivers/filters/writers early to make help work */
1332 recv_init();
1333 filter_init();
1334 writer_init();
1335 if (conf.help_given || conf.detailed_help_given)
1336 print_help_and_die();
1337 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1338 parse_config_or_die();
1339 init_colors_or_die();
1340 init_random_seed_or_die();
1341 daemon_set_flag(DF_LOG_TIME);
1342 daemon_set_flag(DF_LOG_HOSTNAME);
1343 daemon_set_flag(DF_LOG_LL);
1344 if (conf.log_timing_given)
1345 daemon_set_flag(DF_LOG_TIMING);
1346 if (conf.logfile_given) {
1347 daemon_set_logfile(conf.logfile_arg);
1348 daemon_open_log_or_die();
1349 }
1350 ret = parse_stream_args();
1351 if (ret < 0) {
1352 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1353 exit(EXIT_FAILURE);
1354 }
1355 log_welcome("para_audiod");
1356 server_uptime(UPTIME_SET);
1357 set_initial_status();
1358 FOR_EACH_SLOT(i)
1359 clear_slot(i);
1360 setup_signal_handling();
1361 signal_setup_default(sig_task);
1362
1363 init_status_task(stat_task);
1364 init_command_task(cmd_task);
1365
1366 if (conf.daemon_given)
1367 daemonize();
1368
1369 register_task(&sig_task->task);
1370 register_task(&cmd_task->task);
1371 register_task(&stat_task->task);
1372 s.default_timeout.tv_sec = 2;
1373 s.default_timeout.tv_usec = 999 * 1000;
1374 ret = schedule(&s);
1375
1376 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1377 return EXIT_FAILURE;
1378 }