audiod: Fix use after free on exit.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2014 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
9 #include <netinet/in.h>
10 #include <sys/socket.h>
11 #include <regex.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
14 #include <sys/un.h>
15 #include <netdb.h>
16 #include <signal.h>
17
18 #include "para.h"
19 #include "error.h"
20 #include "crypt.h"
21 #include "audiod.cmdline.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "ggo.h"
25 #include "buffer_tree.h"
26 #include "recv.h"
27 #include "filter.h"
28 #include "grab_client.h"
29 #include "client.cmdline.h"
30 #include "client.h"
31 #include "audiod.h"
32 #include "net.h"
33 #include "daemon.h"
34 #include "string.h"
35 #include "fd.h"
36 #include "write.h"
37 #include "write_common.h"
38 #include "signal.h"
39 #include "version.h"
40
41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
42 /** define the array of error lists needed by para_audiod */
43 INIT_AUDIOD_ERRLISTS;
44 /** define the array containing all supported audio formats */
45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
46
47 DEFINE_RECEIVER_ARRAY;
48
49 /** Defines how audiod handles one supported audio format. */
50 struct audio_format_info {
51 /** pointer to the receiver for this audio format */
52 struct receiver *receiver;
53 /** the receiver configuration */
54 void *receiver_conf;
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_filters;
57 /** Array of filter numbers to be activated. */
58 unsigned *filter_nums;
59 /** Pointer to the array of filter configurations. */
60 void **filter_conf;
61 /** the number of filters that should be activated for this audio format */
62 unsigned int num_writers;
63 /** Array of writer numbers to be activated. */
64 int *writer_nums;
65 /** pointer to the array of writer configurations */
66 void **writer_conf;
67 /** do not start receiver/filters/writer before this time */
68 struct timeval restart_barrier;
69 };
70
71 /**
72 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
73 * be associated with a receiver/filter/writer triple. This array holds all
74 * information on the status of these slots.
75 *
76 * \sa struct slot_info
77 * */
78 struct slot_info slot[MAX_STREAM_SLOTS];
79
80 /** The vss status flags audiod is interested in. */
81 enum vss_status_flags {
82 /** Whether the 'N' flag is set. */
83 VSS_STATUS_FLAG_NEXT = 1,
84 /** The 'P' flag is set. */
85 VSS_STATUS_FLAG_PLAYING = 2,
86 };
87
88 /**
89 * The scheduler instance of para_audiod.
90 *
91 * This is needed also in audiod_command.c (for the tasks command), so it can
92 * not be made static.
93 */
94 struct sched sched = {.max_fileno = 0};
95
96 /* The task for obtaining para_server's status (para_client stat). */
97 struct status_task {
98 /** The associated task structure of audiod. */
99 struct task *task;
100 /** Client data associated with the stat task. */
101 struct client_task *ct;
102 /** Do not restart client command until this time. */
103 struct timeval restart_barrier;
104 /** Last time we received status data from para_server. */
105 struct timeval last_status_read;
106 size_t min_iqs;
107 /** The offset value announced by para_server. */
108 int offset_seconds;
109 /** The length of the current audio file as announced by para_server. */
110 int length_seconds;
111 /** The start of the current stream from the view of para_server. */
112 struct timeval server_stream_start;
113 /** The average time deviation between para_server and para_audiod. */
114 struct timeval sa_time_diff;
115 /** Whether client time is ahead of server time. */
116 int sa_time_diff_sign;
117 /** The 'P' and the 'N' flags as announced by para_server. */
118 enum vss_status_flags vss_status;
119 /** Number of times the clock difference is to be checked. */
120 unsigned clock_diff_count;
121 /** When to start the next check for clock difference. */
122 struct timeval clock_diff_barrier;
123 /** Number of the audio format as announced by para_server. */
124 int current_audio_format_num;
125 /* The status task btrn is the child of the client task. */
126 struct btr_node *btrn;
127 };
128
129 /** The array of status items sent by para_server. */
130 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
131
132 /**
133 * the current mode of operation of which can be changed by the on/off/cycle
134 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
135 */
136 int audiod_status = AUDIOD_ON;
137
138 /**
139 * the gengetopt args_info struct that holds information on all command line
140 * arguments
141 */
142 struct audiod_args_info conf;
143
144 static char *socket_name;
145 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
146
147 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
148
149 static struct status_task status_task_struct;
150
151 /**
152 * the task that calls the status command of para_server
153 *
154 * \sa struct status_task
155 */
156 static struct status_task *stat_task = &status_task_struct;
157
158 /**
159 * the task for handling audiod commands
160 *
161 * \sa struct task, struct sched
162 */
163 struct command_task {
164 /** the local listening socket */
165 int fd;
166 /** the associated task structure */
167 struct task *task;
168 };
169
170 /** iterate over all supported audio formats */
171 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
172
173 /**
174 * Get the audio format number.
175 *
176 * \param name The name of the audio format.
177 *
178 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
179 * \a name is not a supported audio format.
180 */
181 static int get_audio_format_num(const char *name)
182 {
183 int i;
184
185 while (para_isspace(*name))
186 name++;
187 FOR_EACH_AUDIO_FORMAT(i)
188 if (!strcmp(name, audio_formats[i]))
189 return i;
190 return -E_UNSUPPORTED_AUDIO_FORMAT;
191 }
192
193 static int get_matching_audio_format_nums(const char *re)
194 {
195 int i, ret;
196 regex_t preg;
197
198 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
199 if (ret < 0)
200 return ret;
201 ret = 0;
202 FOR_EACH_AUDIO_FORMAT(i)
203 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
204 ret |= (1 << i);
205 regfree(&preg);
206 return ret;
207 }
208
209 /**
210 * Compute the play time based on information of the given slot.
211 *
212 * \param slot_num The slot number (negative means: no slot).
213 *
214 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
215 * from the status items received from para_server and the start time of the
216 * (first) writer of the given slot.
217 *
218 * It has to take into account that the stream was probably not started at
219 * the beginning of the file, that the clock between the server and the client
220 * host may differ and that playback of the stream was delayed, e.g. because
221 * the prebuffer filter is used in the filter configuration of the given slot.
222 *
223 * If no writer is active in the given slot, or \a slot_num is negative
224 * (indicating that para_audiod runs in standby mode), an approximation based
225 * only on the status items is computed and the returned string is prefixed
226 * with "~".
227 *
228 * \return A string that must be freed by the caller.
229 */
230 char *get_time_string(int slot_num)
231 {
232 int ret, seconds = 0, length;
233 struct timeval *tmp, sum, sss, /* server stream start */
234 rstime, /* receiver start time */
235 wstime, /* writer start time */
236 wtime, /* now - writer start */
237 rskip; /* receiver start - sss */
238 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
239 char *msg;
240
241 if (audiod_status == AUDIOD_OFF)
242 goto empty;
243 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
244 if (stat_task->length_seconds) /* paused */
245 return NULL;
246 goto empty; /* stopped */
247 }
248 if (audiod_status == AUDIOD_ON && !s)
249 goto empty;
250 /*
251 * Valid status items and playing, set length and tmp to the stream
252 * start. We use the slot info and fall back to the info from current
253 * status items if no slot info is available.
254 */
255 length = stat_task->length_seconds;
256 tmp = &stat_task->server_stream_start;
257 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
258 btr_get_node_start(s->wns[0].btrn, &wstime);
259 if (wstime.tv_sec != 0) { /* writer wrote something */
260 if (s->server_stream_start.tv_sec == 0) {
261 /* copy status info to slot */
262 s->server_stream_start = stat_task->server_stream_start;
263 s->offset_seconds = stat_task->offset_seconds;
264 s->seconds_total = stat_task->length_seconds;
265 }
266 length = s->seconds_total;
267 tmp = &s->server_stream_start;
268 }
269 }
270 if (stat_task->sa_time_diff_sign > 0)
271 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
272 else
273 tv_add(tmp, &stat_task->sa_time_diff, &sss);
274 if (!s || !s->wns || !s->wns[0].btrn) {
275 struct timeval diff;
276 tv_diff(now, &sss, &diff);
277 seconds = diff.tv_sec + stat_task->offset_seconds;
278 goto out;
279 }
280 tv_diff(now, &wstime, &wtime);
281 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
282 seconds = s->offset_seconds;
283 if (s->receiver_node->btrn) {
284 btr_get_node_start(s->receiver_node->btrn, &rstime);
285 ret = tv_diff(&rstime, &sss, &rskip);
286 if (ret > 0) { /* audiod was started in the middle of the stream */
287 tv_add(&wtime, &rskip, &sum);
288 seconds += sum.tv_sec;
289 } else
290 seconds += wtime.tv_sec;
291 } else
292 seconds += wtime.tv_sec;
293 out:
294 seconds = PARA_MIN(seconds, length);
295 seconds = PARA_MAX(seconds, 0);
296 msg = make_message(
297 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
298 s? "" : "~",
299 seconds / 60,
300 seconds % 60,
301 (length - seconds) / 60,
302 (length - seconds) % 60,
303 length? (seconds * 100 + length / 2) / length : 0,
304 length / 60,
305 length % 60
306 );
307 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
308 return msg;
309 empty:
310 return para_strdup(NULL);
311 }
312
313 static int want_colors(void)
314 {
315 if (conf.color_arg == color_arg_no)
316 return 0;
317 if (conf.color_arg == color_arg_yes)
318 return 1;
319 if (conf.logfile_given)
320 return 0;
321 return isatty(STDERR_FILENO);
322 }
323
324 static void parse_config_or_die(void)
325 {
326 int ret;
327 char *config_file;
328 struct audiod_cmdline_parser_params params = {
329 .override = 0,
330 .initialize = 0,
331 .check_required = 1,
332 .check_ambiguity = 0,
333 .print_errors = 1
334 };
335
336 if (conf.config_file_given)
337 config_file = para_strdup(conf.config_file_arg);
338 else {
339 char *home = para_homedir();
340 config_file = make_message("%s/.paraslash/audiod.conf", home);
341 free(home);
342 }
343 ret = file_exists(config_file);
344 if (conf.config_file_given && !ret) {
345 PARA_EMERG_LOG("can not read config file %s\n", config_file);
346 goto err;
347 }
348 if (ret) {
349 audiod_cmdline_parser_config_file(config_file, &conf, &params);
350 daemon_set_loglevel(conf.loglevel_arg);
351 }
352 free(config_file);
353 return;
354 err:
355 free(config_file);
356 exit(EXIT_FAILURE);
357 }
358
359 static void setup_signal_handling(void)
360 {
361 sig_task->fd = para_signal_init();
362 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
363 para_install_sighandler(SIGINT);
364 para_install_sighandler(SIGTERM);
365 para_install_sighandler(SIGHUP);
366 para_sigaction(SIGPIPE, SIG_IGN);
367 }
368
369 static void clear_slot(int slot_num)
370 {
371 struct slot_info *s = &slot[slot_num];
372
373 PARA_INFO_LOG("clearing slot %d\n", slot_num);
374 memset(s, 0, sizeof(struct slot_info));
375 s->format = -1;
376 }
377
378 static void close_receiver(int slot_num)
379 {
380 struct slot_info *s = &slot[slot_num];
381 struct audio_format_info *a;
382
383 if (s->format < 0 || !s->receiver_node)
384 return;
385 a = &afi[s->format];
386 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
387 audio_formats[s->format], slot_num);
388 a->receiver->close(s->receiver_node);
389 btr_remove_node(&s->receiver_node->btrn);
390 task_reap(&s->receiver_node->task);
391 free(s->receiver_node);
392 s->receiver_node = NULL;
393 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
394 &a->restart_barrier);
395 }
396
397 static void writer_cleanup(struct writer_node *wn)
398 {
399 struct writer *w;
400
401 if (!wn)
402 return;
403 w = writers + wn->writer_num;
404 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
405 w->close(wn);
406 btr_remove_node(&wn->btrn);
407 task_reap(&wn->task);
408 }
409
410 static void close_writers(struct slot_info *s)
411 {
412 struct audio_format_info *a;
413 int i;
414
415 if (s->format < 0)
416 return;
417 assert(s->wns);
418 a = afi + s->format;
419 if (a->num_writers == 0)
420 writer_cleanup(s->wns);
421 else {
422 for (i = 0; i < a->num_writers; i++)
423 writer_cleanup(s->wns + i);
424 }
425 free(s->wns);
426 s->wns = NULL;
427 }
428
429 static void close_filters(struct slot_info *s)
430 {
431 int i;
432 struct audio_format_info *a = afi + s->format;
433 if (a->num_filters == 0)
434 return;
435 for (i = a->num_filters - 1; i >= 0; i--) {
436 struct filter_node *fn = s->fns + i;
437 struct filter *f;
438
439 if (!fn)
440 continue;
441 f = filters + fn->filter_num;
442 if (f->close)
443 f->close(fn);
444 btr_remove_node(&fn->btrn);
445 task_reap(&fn->task);
446 }
447 free(s->fns);
448 s->fns = NULL;
449 }
450
451 static void notify_receivers(int error)
452 {
453 int i;
454
455 FOR_EACH_SLOT(i) {
456 struct slot_info *s = slot + i;
457 if (s->format < 0)
458 continue;
459 if (!s->receiver_node)
460 continue;
461 task_notify(s->receiver_node->task, error);
462 }
463 }
464
465 static int get_empty_slot(void)
466 {
467 int i;
468 struct slot_info *s;
469
470 FOR_EACH_SLOT(i) {
471 s = &slot[i];
472 if (s->format < 0) {
473 clear_slot(i);
474 return i;
475 }
476 if (s->wns || s->receiver_node || s->fns)
477 continue;
478 clear_slot(i);
479 return i;
480 }
481 return -E_NO_MORE_SLOTS;
482 }
483
484 static void open_filters(struct slot_info *s)
485 {
486 struct audio_format_info *a = afi + s->format;
487 struct filter_node *fn;
488 int nf = a->num_filters;
489 struct btr_node *parent;
490 int i;
491
492 if (nf == 0)
493 return;
494 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
495 assert(s->fns == NULL);
496 s->fns = para_calloc(nf * sizeof(struct filter_node));
497 parent = s->receiver_node->btrn;
498 for (i = 0; i < nf; i++) {
499 char buf[20];
500 struct filter *f = filters + a->filter_nums[i];
501 fn = s->fns + i;
502 fn->filter_num = a->filter_nums[i];
503 fn->conf = a->filter_conf[i];
504 fn->btrn = btr_new_node(&(struct btr_node_description)
505 EMBRACE(.name = f->name, .parent = parent,
506 .handler = f->execute, .context = fn));
507
508 f->open(fn);
509 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
510 fn->task = task_register(&(struct task_info) {
511 .name = buf,
512 .pre_select = f->pre_select,
513 .post_select = f->post_select,
514 .context = fn,
515 }, &sched);
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 }
520 }
521
522 static void open_writers(struct slot_info *s)
523 {
524 int i;
525 struct audio_format_info *a = afi + s->format;
526 struct writer_node *wn;
527 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
528
529 assert(s->wns == NULL);
530 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
531 * sizeof(struct writer_node));
532 for (i = 0; i < a->num_writers; i++) {
533 wn = s->wns + i;
534 wn->conf = a->writer_conf[i];
535 wn->writer_num = a->writer_nums[i];
536 register_writer_node(wn, parent, &sched);
537 PARA_NOTICE_LOG("%s writer started in slot %d\n",
538 writer_names[a->writer_nums[i]], (int)(s - slot));
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_remove_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 = task_register(&(struct task_info) {
573 .name = r->name,
574 .pre_select = r->pre_select,
575 .post_select = r->post_select,
576 .context = rn,
577 }, &sched);
578 return slot_num;
579 }
580
581 static bool receiver_running(void)
582 {
583 int i;
584 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
585
586 FOR_EACH_SLOT(i) {
587 struct slot_info *s = &slot[i];
588 long unsigned ss2 = s->server_stream_start.tv_sec;
589
590 if (!s->receiver_node)
591 continue;
592 if (task_status(s->receiver_node->task) >= 0)
593 return true;
594 if (ss1 == ss2)
595 return true;
596 }
597 return false;
598 }
599
600 /**
601 * Return the root node of the current buffer tree.
602 *
603 * This is only used for stream grabbing.
604 *
605 * \return \p NULL if no slot is currently active. If more than one buffer tree
606 * exists, the node corresponding to the most recently started receiver is
607 * returned.
608 */
609 struct btr_node *audiod_get_btr_root(void)
610 {
611 int i, newest_slot = -1;
612 struct timeval newest_rstime = {0, 0};
613
614 FOR_EACH_SLOT(i) {
615 struct slot_info *s = &slot[i];
616 struct timeval rstime;
617 if (!s->receiver_node)
618 continue;
619 if (task_status(s->receiver_node->task) < 0)
620 continue;
621 btr_get_node_start(s->receiver_node->btrn, &rstime);
622 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
623 continue;
624 newest_rstime = rstime;
625 newest_slot = i;
626 }
627 if (newest_slot == -1)
628 return NULL;
629 return slot[newest_slot].receiver_node->btrn;
630 }
631
632 /* whether a new instance of a decoder should be started. */
633 static bool must_start_decoder(void)
634 {
635 int cafn = stat_task->current_audio_format_num;
636 unsigned vs = stat_task->vss_status;
637
638 if (audiod_status != AUDIOD_ON)
639 return false;
640 if (cafn < 0)
641 return false;
642 if (!stat_task->ct)
643 return false;
644 if (vs & VSS_STATUS_FLAG_NEXT)
645 return false;
646 if (!(vs & VSS_STATUS_FLAG_PLAYING))
647 return false;
648 if (receiver_running())
649 return false;
650 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
651 return false;
652 return true;
653 }
654
655 static void compute_time_diff(const struct timeval *status_time)
656 {
657 struct timeval tmp, diff;
658 static unsigned count;
659 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
660 const struct timeval max_deviation = {0, 500 * 1000};
661 const int time_smooth = 5;
662
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 }
693
694 static int update_item(int itemnum, char *buf)
695 {
696 long unsigned sec, usec;
697
698 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
699 return 1;
700 free(stat_item_values[itemnum]);
701 stat_item_values[itemnum] = para_strdup(buf);
702 stat_client_write_item(itemnum);
703 switch (itemnum) {
704 case SI_STATUS_FLAGS:
705 stat_task->vss_status = 0;
706 if (strchr(buf, 'N'))
707 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
708 if (strchr(buf, 'P'))
709 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
710 break;
711 case SI_OFFSET:
712 stat_task->offset_seconds = atoi(buf);
713 break;
714 case SI_SECONDS_TOTAL:
715 stat_task->length_seconds = atoi(buf);
716 break;
717 case SI_STREAM_START:
718 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
719 stat_task->server_stream_start.tv_sec = sec;
720 stat_task->server_stream_start.tv_usec = usec;
721 }
722 break;
723 case SI_CURRENT_TIME:
724 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
725 struct timeval tv = {sec, usec};
726 compute_time_diff(&tv);
727 }
728 break;
729 case SI_FORMAT:
730 stat_task->current_audio_format_num
731 = get_audio_format_num(buf);
732 }
733 return 1;
734 }
735
736 static int parse_stream_command(const char *txt, char **cmd)
737 {
738 int ret, len;
739 char *re, *p = strchr(txt, ':');
740
741 if (!p)
742 return -E_MISSING_COLON;
743 *cmd = p + 1;
744 len = p - txt;
745 re = malloc(len + 1);
746 strncpy(re, txt, len);
747 re[len] = '\0';
748 ret = get_matching_audio_format_nums(re);
749 free(re);
750 return ret;
751 }
752
753 static int add_filter(int format, char *cmdline)
754 {
755 struct audio_format_info *a = &afi[format];
756 int filter_num, nf = a->num_filters;
757 void *cfg;
758
759 filter_num = check_filter_arg(cmdline, &cfg);
760 if (filter_num < 0)
761 return filter_num;
762 a->filter_conf = para_realloc(a->filter_conf,
763 (nf + 1) * sizeof(void *));
764 a->filter_nums = para_realloc(a->filter_nums,
765 (nf + 1) * sizeof(unsigned));
766 a->filter_nums[nf] = filter_num;
767 a->filter_conf[nf] = cfg;
768 a->num_filters++;
769 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
770 filters[filter_num].name);
771 return filter_num;
772 }
773
774 static int parse_writer_args(void)
775 {
776 int i, ret;
777 char *cmd;
778 struct audio_format_info *a;
779
780 for (i = 0; i < conf.writer_given; i++) {
781 void *wconf;
782 int j, nw, writer_num, af_mask;
783
784 ret = parse_stream_command(conf.writer_arg[i], &cmd);
785 if (ret < 0)
786 return ret;
787 af_mask = ret;
788 FOR_EACH_AUDIO_FORMAT(j) {
789 a = afi + j;
790 if ((af_mask & (1 << j)) == 0) /* no match */
791 continue;
792 wconf = check_writer_arg_or_die(cmd, &writer_num);
793 nw = a->num_writers;
794 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
795 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
796 a->writer_nums[nw] = writer_num;
797 a->writer_conf[nw] = wconf;
798 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
799 nw, writer_names[writer_num]);
800 a->num_writers++;
801 }
802 }
803 /* Use default writer for audio formats which are not yet set up. */
804 FOR_EACH_AUDIO_FORMAT(i) {
805 void *writer_conf;
806 int writer_num;
807 a = afi + i;
808 if (a->num_writers > 0)
809 continue; /* already set up */
810 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
811 a->writer_nums = para_malloc(sizeof(int));
812 a->writer_nums[0] = writer_num;
813 a->writer_conf = para_malloc(sizeof(void *));
814 a->writer_conf[0] = writer_conf;
815 a->num_writers = 1;
816 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
817 writer_names[writer_num]);
818 }
819 return 1;
820 }
821
822 static int parse_receiver_args(void)
823 {
824 int i, ret, receiver_num;
825 char *cmd = NULL;
826 struct audio_format_info *a;
827
828 for (i = conf.receiver_given - 1; i >= 0; i--) {
829 char *arg;
830 int j, af_mask;
831
832 ret = parse_stream_command(conf.receiver_arg[i], &arg);
833 if (ret < 0)
834 goto out;
835 af_mask = ret;
836 FOR_EACH_AUDIO_FORMAT(j) {
837 a = afi + j;
838 if ((af_mask & (1 << j)) == 0) /* no match */
839 continue;
840 /*
841 * If multiple receivers are given for this audio format, the
842 * last one wins and we have to free the previous receiver
843 * config here. Since we are iterating backwards, the winning
844 * receiver arg is in fact the first one given.
845 */
846 if (a->receiver_conf)
847 a->receiver->free_config(a->receiver_conf);
848 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
849 ret = -E_RECV_SYNTAX;
850 if (!a->receiver_conf)
851 goto out;
852 a->receiver = receivers + receiver_num;
853 }
854 }
855 /*
856 * Use the first available receiver with no arguments for those audio
857 * formats for which no receiver was specified.
858 */
859 cmd = para_strdup(receivers[0].name);
860 FOR_EACH_AUDIO_FORMAT(i) {
861 a = &afi[i];
862 if (a->receiver_conf)
863 continue;
864 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
865 if (!a->receiver_conf)
866 return -E_RECV_SYNTAX;
867 a->receiver = &receivers[receiver_num];
868 }
869 FOR_EACH_AUDIO_FORMAT(i) {
870 a = afi + i;
871 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
872 audio_formats[i], a->receiver->name);
873 }
874 ret = 1;
875 out:
876 free(cmd);
877 return ret;
878 }
879
880 static int init_default_filters(void)
881 {
882 int i, ret = 1;
883
884 FOR_EACH_AUDIO_FORMAT(i) {
885 struct audio_format_info *a = &afi[i];
886 char *tmp;
887 int j;
888
889 if (a->num_filters)
890 continue; /* no default -- nothing to to */
891 /*
892 * udp and dccp streams are fec-encoded, so add fecdec as the
893 * first filter.
894 */
895 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
896 strcmp(afi[i].receiver->name, "dccp") == 0) {
897 tmp = para_strdup("fecdec");
898 add_filter(i, tmp);
899 free(tmp);
900 if (ret < 0)
901 goto out;
902 }
903 /* add "dec" to audio format name */
904 tmp = make_message("%sdec", audio_formats[i]);
905 for (j = 0; filters[j].name; j++)
906 if (!strcmp(tmp, filters[j].name))
907 break;
908 free(tmp);
909 ret = -E_UNSUPPORTED_FILTER;
910 if (!filters[j].name)
911 goto out;
912 tmp = para_strdup(filters[j].name);
913 ret = add_filter(i, tmp);
914 free(tmp);
915 if (ret < 0)
916 goto out;
917 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
918 filters[j].name);
919 }
920 out:
921 return ret;
922 }
923
924 static int parse_filter_args(void)
925 {
926 int i, j, ret, af_mask, num_matches;
927
928 for (i = 0; i < conf.filter_given; i++) {
929 char *arg;
930 ret = parse_stream_command(conf.filter_arg[i], &arg);
931 if (ret < 0)
932 goto out;
933 af_mask = ret;
934 num_matches = 0;
935 FOR_EACH_AUDIO_FORMAT(j) {
936 if ((af_mask & (1 << j)) == 0) /* no match */
937 continue;
938 ret = add_filter(j, arg);
939 if (ret < 0)
940 goto out;
941 num_matches++;
942 }
943 if (num_matches == 0)
944 PARA_WARNING_LOG("ignoring filter spec: %s\n",
945 conf.filter_arg[i]);
946 }
947 ret = init_default_filters(); /* use default values for the rest */
948 out:
949 return ret;
950 }
951
952 static int parse_stream_args(void)
953 {
954 int ret;
955
956 ret = parse_receiver_args();
957 if (ret < 0)
958 return ret;
959 ret = parse_filter_args();
960 if (ret < 0)
961 return ret;
962 ret = parse_writer_args();
963 if (ret < 0)
964 return ret;
965 return 1;
966 }
967
968 /* does not unlink socket on errors */
969 static int audiod_get_socket(void)
970 {
971 struct sockaddr_un unix_addr;
972 int ret, fd;
973
974 if (conf.socket_given)
975 socket_name = para_strdup(conf.socket_arg);
976 else {
977 char *hn = para_hostname();
978 socket_name = make_message("/var/paraslash/audiod_socket.%s",
979 hn);
980 free(hn);
981 }
982 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
983 if (conf.force_given)
984 unlink(socket_name);
985 ret = create_local_socket(socket_name, &unix_addr,
986 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
987 if (ret < 0)
988 goto err;
989 fd = ret;
990 if (listen(fd , 5) < 0) {
991 ret = -ERRNO_TO_PARA_ERROR(errno);
992 goto err;
993 }
994 ret = mark_fd_nonblocking(fd);
995 if (ret < 0)
996 goto err;
997 return fd;
998 err:
999 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1000 exit(EXIT_FAILURE);
1001 }
1002
1003 static void signal_pre_select(struct sched *s, void *context)
1004 {
1005 struct signal_task *st = context;
1006 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1007 }
1008
1009 static int signal_post_select(struct sched *s, __a_unused void *context)
1010 {
1011 int signum;
1012 signum = para_next_signal(&s->rfds);
1013 switch (signum) {
1014 case SIGINT:
1015 case SIGTERM:
1016 case SIGHUP:
1017 PARA_NOTICE_LOG("received signal %d\n", signum);
1018 clean_exit(EXIT_FAILURE, "caught deadly signal");
1019 }
1020 return 0;
1021 }
1022
1023 static void command_pre_select(struct sched *s, void *context)
1024 {
1025 struct command_task *ct = context;
1026 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1027 }
1028
1029 static int command_post_select(struct sched *s, void *context)
1030 {
1031 int ret;
1032 struct command_task *ct = context;
1033 static struct timeval last_status_dump;
1034 struct timeval tmp, delay;
1035 bool force = true;
1036
1037 ret = handle_connect(ct->fd, &s->rfds);
1038 if (ret < 0)
1039 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1040 else if (ret > 0)
1041 goto dump;
1042
1043 /* if last status dump was less than 500ms ago, do nothing */
1044 delay.tv_sec = 0;
1045 delay.tv_usec = 500 * 1000;
1046 tv_add(&last_status_dump, &delay, &tmp);
1047 if (tv_diff(now, &tmp, NULL) < 0)
1048 return 0;
1049
1050 /*
1051 * If last status dump was more than 5s ago, force update. Otherwise,
1052 * update only those items that have changed.
1053 */
1054 delay.tv_sec = 5;
1055 delay.tv_usec = 0;
1056 tv_add(&last_status_dump, &delay, &tmp);
1057 if (tv_diff(now, &tmp, NULL) < 0)
1058 force = false;
1059 dump:
1060 audiod_status_dump(force);
1061 last_status_dump = *now;
1062 return 1;
1063 }
1064
1065 static void init_command_task(struct command_task *ct)
1066 {
1067 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1068
1069 ct->task = task_register(&(struct task_info) {
1070 .name = "command",
1071 .pre_select = command_pre_select,
1072 .post_select = command_post_select,
1073 .context = ct,
1074 }, &sched);
1075 }
1076
1077 static void close_stat_pipe(void)
1078 {
1079 if (!stat_task->ct)
1080 return;
1081 task_reap(&stat_task->ct->task);
1082 client_close(stat_task->ct);
1083 stat_task->ct = NULL;
1084 clear_and_dump_items();
1085 stat_task->length_seconds = 0;
1086 stat_task->offset_seconds = 0;
1087 stat_task->vss_status = 0;
1088 stat_task->current_audio_format_num = -1;
1089 audiod_status_dump(true);
1090 }
1091
1092 /* avoid busy loop if server is down */
1093 static void set_stat_task_restart_barrier(unsigned seconds)
1094 {
1095 struct timeval delay = {seconds, 0};
1096 tv_add(now, &delay, &stat_task->restart_barrier);
1097 }
1098
1099 static bool must_close_slot(int slot_num)
1100 {
1101 struct slot_info *s = &slot[slot_num];
1102 struct audio_format_info *a = afi + s->format;
1103 int i;
1104
1105 if (s->format < 0)
1106 return false;
1107 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1108 return false;
1109 for (i = 0; i < a->num_filters; i++)
1110 if (s->fns && task_status(s->fns[i].task) >= 0)
1111 return false;
1112 if (a->num_writers > 0) {
1113 for (i = 0; i < a->num_writers; i++)
1114 if (s->wns && task_status(s->wns[i].task) >= 0)
1115 return false;
1116 } else {
1117 if (s->wns && task_status(s->wns[0].task) >= 0)
1118 return false;
1119 }
1120 return true;
1121 }
1122
1123 static void close_slot(int slot_num)
1124 {
1125 struct slot_info *s = slot + slot_num;
1126
1127 PARA_INFO_LOG("closing slot %d\n", slot_num);
1128 close_writers(s);
1129 close_filters(s);
1130 close_receiver(slot_num);
1131 clear_slot(slot_num);
1132 }
1133
1134 static void close_unused_slots(void)
1135 {
1136 int i;
1137
1138 FOR_EACH_SLOT(i)
1139 if (must_close_slot(i))
1140 close_slot(i);
1141 }
1142
1143 /**
1144 * Close the connection to para_server and exit.
1145 *
1146 * \param status The exit status which is passed to exit(3).
1147 * \param msg The log message
1148 *
1149 * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1150 * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1151 * or EXIT_FAILURE.
1152 *
1153 * \sa exit(3).
1154 */
1155 void __noreturn clean_exit(int status, const char *msg)
1156 {
1157 if (socket_name)
1158 unlink(socket_name);
1159 close_stat_pipe();
1160 close_unused_slots();
1161 audiod_cmdline_parser_free(&conf);
1162 close_stat_clients();
1163 PARA_EMERG_LOG("%s\n", msg);
1164 exit(status);
1165 }
1166
1167 /*
1168 * Check if any receivers/filters/writers need to be started and do so if
1169 * necessary.
1170 */
1171 static void start_stop_decoders(void)
1172 {
1173 int ret;
1174 struct slot_info *sl;
1175
1176 close_unused_slots();
1177 if (audiod_status != AUDIOD_ON ||
1178 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1179 return notify_receivers(E_NOT_PLAYING);
1180 if (!must_start_decoder())
1181 return;
1182 ret = open_receiver(stat_task->current_audio_format_num);
1183 if (ret < 0) {
1184 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1185 return;
1186 }
1187 sl = slot + ret;
1188 open_filters(sl);
1189 open_writers(sl);
1190 activate_grab_clients(&sched);
1191 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1192 }
1193
1194 static void status_pre_select(struct sched *s, void *context)
1195 {
1196 struct status_task *st = context;
1197 int i, ret, cafn = stat_task->current_audio_format_num;
1198
1199 if (must_start_decoder())
1200 goto min_delay;
1201 FOR_EACH_SLOT(i)
1202 if (must_close_slot(i))
1203 goto min_delay;
1204 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1205 if (ret > 0)
1206 goto min_delay;
1207 if (st->ct && audiod_status == AUDIOD_OFF)
1208 goto min_delay;
1209 if (!st->ct && audiod_status != AUDIOD_OFF)
1210 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1211 if (cafn >= 0)
1212 sched_request_barrier(&afi[cafn].restart_barrier, s);
1213 /*
1214 * If para_server is playing we'd like to have a smooth time display
1215 * even if we are running in standby mode. So we request a timeout that
1216 * expires at the next full second.
1217 */
1218 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1219 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1220 return;
1221 min_delay:
1222 sched_min_delay(s);
1223 }
1224
1225 /* restart the client task if necessary */
1226 static int status_post_select(struct sched *s, void *context)
1227 {
1228 struct status_task *st = context;
1229
1230 if (audiod_status == AUDIOD_OFF) {
1231 if (!st->ct)
1232 goto out;
1233 if (task_status(st->ct->task) >= 0) {
1234 task_notify(st->ct->task, E_AUDIOD_OFF);
1235 goto out;
1236 }
1237 close_stat_pipe();
1238 st->clock_diff_count = conf.clock_diff_count_arg;
1239 goto out;
1240 }
1241 if (st->ct) {
1242 char *buf;
1243 size_t sz;
1244 int ret;
1245
1246 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1247 if (ret < 0) {
1248 close_stat_pipe();
1249 goto out;
1250 }
1251 if (st->ct->status != CL_EXECUTING)
1252 goto out;
1253 if (ret == 0) {
1254 struct timeval diff;
1255 tv_diff(now, &st->last_status_read, &diff);
1256 if (diff.tv_sec > 61)
1257 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1258 goto out;
1259 }
1260 btr_merge(st->btrn, st->min_iqs);
1261 sz = btr_next_buffer(st->btrn, &buf);
1262 ret = for_each_stat_item(buf, sz, update_item);
1263 if (ret < 0) {
1264 task_notify(st->ct->task, -ret);
1265 goto out;
1266 }
1267 if (sz != ret) {
1268 btr_consume(st->btrn, sz - ret);
1269 st->last_status_read = *now;
1270 st->min_iqs = 0;
1271 } else /* current status item crosses buffers */
1272 st->min_iqs = sz + 1;
1273 goto out;
1274 }
1275 btr_drain(st->btrn);
1276 st->current_audio_format_num = -1;
1277 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1278 goto out;
1279 if (st->clock_diff_count) { /* get status only one time */
1280 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1281 int argc = 5;
1282 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1283 st->clock_diff_count--;
1284 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1285 set_stat_task_restart_barrier(2);
1286
1287 } else {
1288 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1289 int argc = 4;
1290 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1291 set_stat_task_restart_barrier(5);
1292 }
1293 free(stat_item_values[SI_BASENAME]);
1294 stat_item_values[SI_BASENAME] = para_strdup(
1295 "no connection to para_server");
1296 stat_client_write_item(SI_BASENAME);
1297 st->last_status_read = *now;
1298 out:
1299 start_stop_decoders();
1300 return 0;
1301 }
1302
1303 static void init_status_task(struct status_task *st)
1304 {
1305 memset(st, 0, sizeof(struct status_task));
1306 st->sa_time_diff_sign = 1;
1307 st->clock_diff_count = conf.clock_diff_count_arg;
1308 st->current_audio_format_num = -1;
1309 st->btrn = btr_new_node(&(struct btr_node_description)
1310 EMBRACE(.name = "stat"));
1311
1312 stat_task->task = task_register(&(struct task_info) {
1313 .name = "stat",
1314 .pre_select = status_pre_select,
1315 .post_select = status_post_select,
1316 .context = stat_task,
1317 }, &sched);
1318 }
1319
1320 static void set_initial_status(void)
1321 {
1322 audiod_status = AUDIOD_ON;
1323 if (!conf.mode_given)
1324 return;
1325 if (!strcmp(conf.mode_arg, "sb")) {
1326 audiod_status = AUDIOD_STANDBY;
1327 return;
1328 }
1329 if (!strcmp(conf.mode_arg, "off")) {
1330 audiod_status = AUDIOD_OFF;
1331 return;
1332 }
1333 if (strcmp(conf.mode_arg, "on"))
1334 PARA_WARNING_LOG("invalid mode\n");
1335 }
1336
1337 __noreturn static void print_help_and_die(void)
1338 {
1339 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1340 bool d = conf.detailed_help_given;
1341 unsigned flags;
1342
1343 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1344 ggo_print_help(&h, flags);
1345
1346 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1347 print_receiver_helps(flags);
1348 print_filter_helps(flags);
1349 print_writer_helps(flags);
1350 exit(0);
1351 }
1352
1353 static void init_colors_or_die(void)
1354 {
1355 int i;
1356
1357 if (!want_colors())
1358 return;
1359 daemon_set_default_log_colors();
1360 daemon_set_flag(DF_COLOR_LOG);
1361 for (i = 0; i < conf.log_color_given; i++)
1362 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1363 }
1364
1365 /**
1366 * the main function of para_audiod
1367 *
1368 * \param argc usual argument count
1369 * \param argv usual argument vector
1370 *
1371 * \return EXIT_SUCCESS or EXIT_FAILURE
1372 *
1373 * \sa para_audiod(1)
1374 * */
1375 int main(int argc, char *argv[])
1376 {
1377 int ret, i;
1378 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1379 struct audiod_cmdline_parser_params params = {
1380 .override = 0,
1381 .initialize = 1,
1382 .check_required = 0,
1383 .check_ambiguity = 0,
1384 .print_errors = 1
1385 };
1386
1387 valid_fd_012();
1388 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1389 daemon_set_loglevel(conf.loglevel_arg);
1390 version_handle_flag("audiod", conf.version_given);
1391 /* init receivers/filters/writers early to make help work */
1392 recv_init();
1393 filter_init();
1394 writer_init();
1395 if (conf.help_given || conf.detailed_help_given)
1396 print_help_and_die();
1397 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1398 parse_config_or_die();
1399 init_colors_or_die();
1400 init_random_seed_or_die();
1401 daemon_set_flag(DF_LOG_TIME);
1402 daemon_set_flag(DF_LOG_HOSTNAME);
1403 daemon_set_flag(DF_LOG_LL);
1404 if (conf.log_timing_given)
1405 daemon_set_flag(DF_LOG_TIMING);
1406 if (conf.logfile_given) {
1407 daemon_set_logfile(conf.logfile_arg);
1408 daemon_open_log_or_die();
1409 }
1410 ret = parse_stream_args();
1411 if (ret < 0) {
1412 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1413 exit(EXIT_FAILURE);
1414 }
1415 log_welcome("para_audiod");
1416 set_server_start_time(NULL);
1417 set_initial_status();
1418 FOR_EACH_SLOT(i)
1419 clear_slot(i);
1420 setup_signal_handling();
1421
1422 init_status_task(stat_task);
1423 init_command_task(cmd_task);
1424
1425 if (conf.daemon_given)
1426 daemonize(false /* parent exits immediately */);
1427
1428 sig_task->task = task_register(&(struct task_info) {
1429 .name = "signal",
1430 .pre_select = signal_pre_select,
1431 .post_select = signal_post_select,
1432 .context = sig_task,
1433 }, &sched);
1434
1435 sched.default_timeout.tv_sec = 2;
1436 sched.default_timeout.tv_usec = 999 * 1000;
1437 ret = schedule(&sched);
1438 sched_shutdown(&sched);
1439
1440 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1441 return EXIT_FAILURE;
1442 }