signal.h: Add documentation of signal_pre_select().
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
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 #include <pwd.h>
18
19 #include "para.h"
20 #include "error.h"
21 #include "crypt.h"
22 #include "audiod.cmdline.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "ggo.h"
26 #include "buffer_tree.h"
27 #include "recv.h"
28 #include "filter.h"
29 #include "grab_client.h"
30 #include "client.cmdline.h"
31 #include "client.h"
32 #include "audiod.h"
33 #include "net.h"
34 #include "daemon.h"
35 #include "string.h"
36 #include "fd.h"
37 #include "write.h"
38 #include "write_common.h"
39 #include "signal.h"
40 #include "version.h"
41
42 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
43 /** define the array of error lists needed by para_audiod */
44 INIT_AUDIOD_ERRLISTS;
45 /** define the array containing all supported audio formats */
46 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
47
48 DEFINE_RECEIVER_ARRAY;
49
50 /** Defines how audiod handles one supported audio format. */
51 struct audio_format_info {
52 /** pointer to the receiver for this audio format */
53 struct receiver *receiver;
54 /** the receiver configuration */
55 void *receiver_conf;
56 /** the number of filters that should be activated for this audio format */
57 unsigned int num_filters;
58 /** Array of filter numbers to be activated. */
59 unsigned *filter_nums;
60 /** Pointer to the array of filter configurations. */
61 void **filter_conf;
62 /** the number of filters that should be activated for this audio format */
63 unsigned int num_writers;
64 /** Array of writer numbers to be activated. */
65 int *writer_nums;
66 /** pointer to the array of writer configurations */
67 void **writer_conf;
68 /** do not start receiver/filters/writer before this time */
69 struct timeval restart_barrier;
70 };
71
72 /* Describes one instance of a receiver-filter-writer chain. */
73 struct slot_info {
74 /* Number of the audio format in this slot. */
75 int format;
76 /* The stream_start status item announced by para_server. */
77 struct timeval server_stream_start;
78 /* The offset status item announced by para_server. */
79 unsigned offset_seconds;
80 /* The seconds_total status item announced by para_server. */
81 unsigned seconds_total;
82 /* The receiver info associated with this slot. */
83 struct receiver_node *receiver_node;
84 /* The array of filter nodes. */
85 struct filter_node *fns;
86 /* The array of writers attached to the last filter. */
87 struct writer_node *wns;
88 };
89
90 /** Maximal number of simultaneous instances. */
91 #define MAX_STREAM_SLOTS 5
92
93 /** Iterate over all slots. */
94 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
95
96 /**
97 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
98 * be associated with a receiver/filter/writer triple. This array holds all
99 * information on the status of these slots.
100 *
101 * \sa struct slot_info
102 * */
103 struct slot_info slot[MAX_STREAM_SLOTS];
104
105 /** The vss status flags audiod is interested in. */
106 enum vss_status_flags {
107 /** Whether the 'N' flag is set. */
108 VSS_STATUS_FLAG_NEXT = 1,
109 /** The 'P' flag is set. */
110 VSS_STATUS_FLAG_PLAYING = 2,
111 };
112
113 /**
114 * The scheduler instance of para_audiod.
115 *
116 * This is needed also in audiod_command.c (for the tasks command), so it can
117 * not be made static.
118 */
119 struct sched sched = {.max_fileno = 0};
120
121 /* The task for obtaining para_server's status (para_client stat). */
122 struct status_task {
123 /** The associated task structure of audiod. */
124 struct task *task;
125 /** Client data associated with the stat task. */
126 struct client_task *ct;
127 /** Do not restart client command until this time. */
128 struct timeval restart_barrier;
129 /** Last time we received status data from para_server. */
130 struct timeval last_status_read;
131 size_t min_iqs;
132 /** The offset value announced by para_server. */
133 int offset_seconds;
134 /** The length of the current audio file as announced by para_server. */
135 int length_seconds;
136 /** The start of the current stream from the view of para_server. */
137 struct timeval server_stream_start;
138 /** The average time deviation between para_server and para_audiod. */
139 struct timeval sa_time_diff;
140 /** Whether client time is ahead of server time. */
141 int sa_time_diff_sign;
142 /** The 'P' and the 'N' flags as announced by para_server. */
143 enum vss_status_flags vss_status;
144 /** Number of times the clock difference is to be checked. */
145 unsigned clock_diff_count;
146 /** When to start the next check for clock difference. */
147 struct timeval clock_diff_barrier;
148 /** Number of the audio format as announced by para_server. */
149 int current_audio_format_num;
150 /* The status task btrn is the child of the client task. */
151 struct btr_node *btrn;
152 };
153
154 /** The array of status items sent by para_server. */
155 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
156
157 /**
158 * the current mode of operation of which can be changed by the on/off/cycle
159 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
160 */
161 int audiod_status = AUDIOD_ON;
162
163 /**
164 * the gengetopt args_info struct that holds information on all command line
165 * arguments
166 */
167 static struct audiod_args_info conf;
168
169 static char *socket_name;
170 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
171
172 static struct signal_task *signal_task;
173
174 static struct status_task status_task_struct;
175
176 static uid_t *uid_whitelist;
177
178 /**
179 * the task that calls the status command of para_server
180 *
181 * \sa struct status_task
182 */
183 static struct status_task *stat_task = &status_task_struct;
184
185 /*
186 * The task for handling audiod commands.
187 *
188 * We need two listening sockets for backward compability: on Linux systems
189 * fd[0] is an abstract socket (more precisely, a socket bound to an address in
190 * the abstract namespace), and fd[1] is the usual pathname socket. On other
191 * systems, fd[0] is negative, and only the pathname socket is used.
192 *
193 * For 0.5.x we accept connections on both sockets to make sure that old
194 * para_audioc versions can still connect. New versions use only the abstract
195 * socket. Hence after v0.6.0 we can go back to a single socket, either an
196 * abstract one (Linux) or a pathname socket (all other systems).
197 */
198 struct command_task {
199 /** The local listening sockets. */
200 int fd[2];
201 /** the associated task structure */
202 struct task *task;
203 };
204
205 /** iterate over all supported audio formats */
206 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
207
208 /**
209 * Get the audio format number.
210 *
211 * \param name The name of the audio format.
212 *
213 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
214 * \a name is not a supported audio format.
215 */
216 static int get_audio_format_num(const char *name)
217 {
218 int i;
219
220 while (para_isspace(*name))
221 name++;
222 FOR_EACH_AUDIO_FORMAT(i)
223 if (!strcmp(name, audio_formats[i]))
224 return i;
225 return -E_UNSUPPORTED_AUDIO_FORMAT;
226 }
227
228 /**
229 * Return the flags for the \a decoder_flags status item.
230 *
231 * Allocates a string which contains one octal digit per slot. Bit zero (value
232 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
233 * have the analogous meaning for filter and writer, respectively.
234 *
235 * \return String that must be freed by the caller.
236 */
237 __malloc char *audiod_get_decoder_flags(void)
238 {
239 int i;
240 char flags[MAX_STREAM_SLOTS + 1];
241
242 FOR_EACH_SLOT(i) {
243 struct slot_info *s = &slot[i];
244 char flag = '0';
245 if (s->receiver_node)
246 flag += 1;
247 if (s->fns)
248 flag += 2;
249 if (s->wns)
250 flag += 4;
251 flags[i] = flag;
252 }
253 flags[MAX_STREAM_SLOTS] = '\0';
254 return para_strdup(flags);
255 }
256
257 static int get_matching_audio_format_nums(const char *re)
258 {
259 int i, ret;
260 regex_t preg;
261
262 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
263 if (ret < 0)
264 return ret;
265 ret = 0;
266 FOR_EACH_AUDIO_FORMAT(i)
267 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
268 ret |= (1 << i);
269 regfree(&preg);
270 return ret;
271 }
272
273 static int get_play_time_slot_num(void)
274 {
275 int i, oldest_slot = -1;
276 struct timeval oldest_wstime = {0, 0};
277
278 FOR_EACH_SLOT(i) {
279 struct slot_info *s = &slot[i];
280 struct timeval wstime;
281 if (!s->wns || !s->wns[0].btrn)
282 continue;
283 btr_get_node_start(s->wns[0].btrn, &wstime);
284 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
285 continue;
286 oldest_wstime = wstime;
287 oldest_slot = i;
288 }
289 return oldest_slot;
290 }
291
292 /**
293 * Compute the play time based on information of the current slot.
294 *
295 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
296 * from the status items received from para_server and the start time of the
297 * (first) writer of the current slot.
298 *
299 * It has to take into account that the stream was probably not started at
300 * the beginning of the file, that the clock between the server and the client
301 * host may differ and that playback of the stream was delayed, e.g. because
302 * the prebuffer filter is used in the filter configuration.
303 *
304 * If no writer is active, for example because para_audiod runs in standby
305 * mode, an approximation based only on the status items is computed and the
306 * returned string is prefixed with "~".
307 *
308 * \return A string that must be freed by the caller.
309 */
310 char *get_time_string(void)
311 {
312 int ret, seconds = 0, length = stat_task->length_seconds;
313 struct timeval *tmp, sum, sss, /* server stream start */
314 rstime, /* receiver start time */
315 wstime, /* writer start time */
316 wtime, /* now - writer start */
317 rskip; /* receiver start - sss */
318 int slot_num = get_play_time_slot_num();
319 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
320 char *msg;
321
322 if (audiod_status == AUDIOD_OFF)
323 goto empty;
324 if (stat_task->server_stream_start.tv_sec == 0) {
325 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
326 goto out; /* server is about to change file */
327 if (length > 0) /* paused */
328 return NULL;
329 goto empty; /* stopped */
330 }
331 /*
332 * Valid status items and playing, set length and tmp to the stream
333 * start. We use the slot info and fall back to the info from current
334 * status items if no slot info is available.
335 */
336 tmp = &stat_task->server_stream_start;
337 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
338 btr_get_node_start(s->wns[0].btrn, &wstime);
339 if (wstime.tv_sec != 0) { /* writer wrote something */
340 if (s->server_stream_start.tv_sec == 0) {
341 /* copy status info to slot */
342 s->server_stream_start = stat_task->server_stream_start;
343 s->offset_seconds = stat_task->offset_seconds;
344 s->seconds_total = stat_task->length_seconds;
345 }
346 length = s->seconds_total;
347 tmp = &s->server_stream_start;
348 }
349 }
350 if (stat_task->sa_time_diff_sign > 0)
351 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
352 else
353 tv_add(tmp, &stat_task->sa_time_diff, &sss);
354 if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
355 struct timeval diff;
356 tv_diff(now, &sss, &diff);
357 seconds = diff.tv_sec + stat_task->offset_seconds;
358 goto out;
359 }
360 tv_diff(now, &wstime, &wtime);
361 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
362 seconds = s->offset_seconds;
363 if (s->receiver_node->btrn) {
364 btr_get_node_start(s->receiver_node->btrn, &rstime);
365 ret = tv_diff(&rstime, &sss, &rskip);
366 if (ret > 0 && rskip.tv_sec > 2) {
367 /* audiod was started in the middle of the stream */
368 tv_add(&wtime, &rskip, &sum);
369 seconds += sum.tv_sec;
370 } else
371 seconds += wtime.tv_sec;
372 } else
373 seconds += wtime.tv_sec;
374 out:
375 seconds = PARA_MIN(seconds, length);
376 seconds = PARA_MAX(seconds, 0);
377 msg = make_message(
378 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
379 s? "" : "~",
380 seconds / 60,
381 seconds % 60,
382 (length - seconds) / 60,
383 (length - seconds) % 60,
384 length? (seconds * 100 + length / 2) / length : 0,
385 length / 60,
386 length % 60
387 );
388 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
389 return msg;
390 empty:
391 return para_strdup(NULL);
392 }
393
394 static void parse_config_or_die(void)
395 {
396 int ret, i;
397 char *config_file;
398 struct audiod_cmdline_parser_params params = {
399 .override = 0,
400 .initialize = 0,
401 .check_required = 1,
402 .check_ambiguity = 0,
403 .print_errors = 1
404 };
405
406 if (conf.config_file_given)
407 config_file = para_strdup(conf.config_file_arg);
408 else {
409 char *home = para_homedir();
410 config_file = make_message("%s/.paraslash/audiod.conf", home);
411 free(home);
412 }
413 ret = file_exists(config_file);
414 if (conf.config_file_given && !ret) {
415 PARA_EMERG_LOG("can not read config file %s\n", config_file);
416 free(config_file);
417 goto err;
418 }
419 if (ret) {
420 audiod_cmdline_parser_config_file(config_file, &conf, &params);
421 daemon_set_loglevel(conf.loglevel_arg);
422 }
423 free(config_file);
424 if (conf.user_allow_given > 0) {
425 uid_whitelist = para_malloc(conf.user_allow_given
426 * sizeof(uid_t));
427 for (i = 0; i < conf.user_allow_given; i++) {
428 int32_t val;
429 struct passwd *pw;
430 ret = para_atoi32(conf.user_allow_arg[i], &val);
431 if (ret >= 0) {
432 uid_whitelist[i] = val;
433 continue;
434 }
435 errno = 0; /* see getpwnam(3) */
436 pw = getpwnam(conf.user_allow_arg[i]);
437 if (!pw) {
438 PARA_EMERG_LOG("invalid username: %s\n",
439 conf.user_allow_arg[i]);
440 goto err;
441 }
442 uid_whitelist[i] = pw->pw_uid;
443 }
444 }
445 return;
446 err:
447 exit(EXIT_FAILURE);
448 }
449
450 static void setup_signal_handling(void)
451 {
452 signal_task = signal_init_or_die();
453 para_install_sighandler(SIGINT);
454 para_install_sighandler(SIGTERM);
455 para_install_sighandler(SIGHUP);
456 para_sigaction(SIGPIPE, SIG_IGN);
457 }
458
459 static void clear_slot(int slot_num)
460 {
461 struct slot_info *s = &slot[slot_num];
462
463 PARA_INFO_LOG("clearing slot %d\n", slot_num);
464 memset(s, 0, sizeof(struct slot_info));
465 s->format = -1;
466 }
467
468 static void close_receiver(int slot_num)
469 {
470 struct slot_info *s = &slot[slot_num];
471 struct audio_format_info *a;
472
473 if (s->format < 0 || !s->receiver_node)
474 return;
475 a = &afi[s->format];
476 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
477 audio_formats[s->format], slot_num);
478 a->receiver->close(s->receiver_node);
479 btr_remove_node(&s->receiver_node->btrn);
480 task_reap(&s->receiver_node->task);
481 free(s->receiver_node);
482 s->receiver_node = NULL;
483 stat_task->current_audio_format_num = -1;
484 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
485 &a->restart_barrier);
486 }
487
488 static void writer_cleanup(struct writer_node *wn)
489 {
490 struct writer *w;
491
492 if (!wn)
493 return;
494 w = writers + wn->writer_num;
495 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
496 w->close(wn);
497 btr_remove_node(&wn->btrn);
498 task_reap(&wn->task);
499 }
500
501 static void close_writers(struct slot_info *s)
502 {
503 struct audio_format_info *a;
504 int i;
505
506 if (s->format < 0)
507 return;
508 assert(s->wns);
509 a = afi + s->format;
510 if (a->num_writers == 0)
511 writer_cleanup(s->wns);
512 else {
513 for (i = 0; i < a->num_writers; i++)
514 writer_cleanup(s->wns + i);
515 }
516 free(s->wns);
517 s->wns = NULL;
518 }
519
520 static void close_filters(struct slot_info *s)
521 {
522 int i;
523 struct audio_format_info *a = afi + s->format;
524 if (a->num_filters == 0)
525 return;
526 for (i = a->num_filters - 1; i >= 0; i--) {
527 struct filter_node *fn = s->fns + i;
528 const struct filter *f;
529
530 if (!fn)
531 continue;
532 f = filter_get(fn->filter_num);
533 if (f->close)
534 f->close(fn);
535 btr_remove_node(&fn->btrn);
536 task_reap(&fn->task);
537 }
538 free(s->fns);
539 s->fns = NULL;
540 }
541
542 static void notify_receivers(int error)
543 {
544 int i;
545
546 FOR_EACH_SLOT(i) {
547 struct slot_info *s = slot + i;
548 if (s->format < 0)
549 continue;
550 if (!s->receiver_node)
551 continue;
552 task_notify(s->receiver_node->task, error);
553 }
554 }
555
556 static int get_empty_slot(void)
557 {
558 int i;
559 struct slot_info *s;
560
561 FOR_EACH_SLOT(i) {
562 s = &slot[i];
563 if (s->format < 0) {
564 clear_slot(i);
565 return i;
566 }
567 if (s->wns || s->receiver_node || s->fns)
568 continue;
569 clear_slot(i);
570 return i;
571 }
572 return -E_NO_MORE_SLOTS;
573 }
574
575 static void open_filters(struct slot_info *s)
576 {
577 struct audio_format_info *a = afi + s->format;
578 struct filter_node *fn;
579 int nf = a->num_filters;
580 struct btr_node *parent;
581 int i;
582
583 if (nf == 0)
584 return;
585 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
586 assert(s->fns == NULL);
587 s->fns = para_calloc(nf * sizeof(struct filter_node));
588 parent = s->receiver_node->btrn;
589 for (i = 0; i < nf; i++) {
590 char buf[20];
591 const struct filter *f = filter_get(a->filter_nums[i]);
592 fn = s->fns + i;
593 fn->filter_num = a->filter_nums[i];
594 fn->conf = a->filter_conf[i];
595 fn->btrn = btr_new_node(&(struct btr_node_description)
596 EMBRACE(.name = f->name, .parent = parent,
597 .handler = f->execute, .context = fn));
598
599 if (f->open)
600 f->open(fn);
601 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
602 fn->task = task_register(&(struct task_info) {
603 .name = buf,
604 .pre_select = f->pre_select,
605 .post_select = f->post_select,
606 .context = fn,
607 }, &sched);
608 parent = fn->btrn;
609 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
610 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
611 }
612 }
613
614 static void open_writers(struct slot_info *s)
615 {
616 int i;
617 struct audio_format_info *a = afi + s->format;
618 struct writer_node *wn;
619 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
620
621 assert(s->wns == NULL);
622 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
623 * sizeof(struct writer_node));
624 for (i = 0; i < a->num_writers; i++) {
625 wn = s->wns + i;
626 wn->conf = a->writer_conf[i];
627 wn->writer_num = a->writer_nums[i];
628 register_writer_node(wn, parent, &sched);
629 PARA_NOTICE_LOG("%s writer started in slot %d\n",
630 writer_names[a->writer_nums[i]], (int)(s - slot));
631 }
632 }
633
634 /* returns slot num on success */
635 static int open_receiver(int format)
636 {
637 struct audio_format_info *a = &afi[format];
638 struct slot_info *s;
639 int ret, slot_num;
640 struct receiver *r = a->receiver;
641 struct receiver_node *rn;
642
643 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
644 ret = get_empty_slot();
645 if (ret < 0)
646 return ret;
647 slot_num = ret;
648 rn = para_calloc(sizeof(*rn));
649 rn->receiver = r;
650 rn->conf = a->receiver_conf;
651 rn->btrn = btr_new_node(&(struct btr_node_description)
652 EMBRACE(.name = r->name, .context = rn));
653 ret = r->open(rn);
654 if (ret < 0) {
655 btr_remove_node(&rn->btrn);
656 free(rn);
657 return ret;
658 }
659 s = &slot[slot_num];
660 s->format = format;
661 s->receiver_node = rn;
662 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
663 audio_formats[format], r->name, slot_num);
664 rn->task = task_register(&(struct task_info) {
665 .name = r->name,
666 .pre_select = r->pre_select,
667 .post_select = r->post_select,
668 .context = rn,
669 }, &sched);
670 return slot_num;
671 }
672
673 static bool receiver_running(void)
674 {
675 int i;
676 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
677
678 FOR_EACH_SLOT(i) {
679 struct slot_info *s = &slot[i];
680 long unsigned ss2 = s->server_stream_start.tv_sec;
681
682 if (!s->receiver_node)
683 continue;
684 if (task_status(s->receiver_node->task) >= 0)
685 return true;
686 if (ss1 == ss2)
687 return true;
688 }
689 return false;
690 }
691
692 /**
693 * Return the root node of the current buffer tree.
694 *
695 * This is only used for stream grabbing.
696 *
697 * \return \p NULL if no slot is currently active. If more than one buffer tree
698 * exists, the node corresponding to the most recently started receiver is
699 * returned.
700 */
701 struct btr_node *audiod_get_btr_root(void)
702 {
703 int i, newest_slot = -1;
704 struct timeval newest_rstime = {0, 0};
705
706 FOR_EACH_SLOT(i) {
707 struct slot_info *s = &slot[i];
708 struct timeval rstime;
709 if (!s->receiver_node)
710 continue;
711 if (task_status(s->receiver_node->task) < 0)
712 continue;
713 btr_get_node_start(s->receiver_node->btrn, &rstime);
714 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
715 continue;
716 newest_rstime = rstime;
717 newest_slot = i;
718 }
719 if (newest_slot == -1)
720 return NULL;
721 return slot[newest_slot].receiver_node->btrn;
722 }
723
724 /* whether a new instance of a decoder should be started. */
725 static bool must_start_decoder(void)
726 {
727 int cafn = stat_task->current_audio_format_num;
728 unsigned vs = stat_task->vss_status;
729
730 if (audiod_status != AUDIOD_ON)
731 return false;
732 if (cafn < 0)
733 return false;
734 if (!stat_task->ct)
735 return false;
736 if (vs & VSS_STATUS_FLAG_NEXT)
737 return false;
738 if (!(vs & VSS_STATUS_FLAG_PLAYING))
739 return false;
740 if (receiver_running())
741 return false;
742 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
743 return false;
744 return true;
745 }
746
747 static void compute_time_diff(const struct timeval *status_time)
748 {
749 struct timeval tmp, diff;
750 static unsigned count;
751 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
752 const struct timeval max_deviation = {0, 500 * 1000};
753 const int time_smooth = 5;
754
755 sign = tv_diff(status_time, now, &diff);
756 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
757 // sign, sa_time_diff_sign);
758 if (!count) {
759 sa_time_diff_sign = sign;
760 stat_task->sa_time_diff = diff;
761 count++;
762 goto out;
763 }
764 if (count > 5) {
765 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
766 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
767 PARA_WARNING_LOG("time diff jump: %lums\n",
768 s * tv2ms(&tmp));
769 }
770 count++;
771 sa_time_diff_sign = tv_convex_combination(
772 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
773 count > 10? sign : sign * time_smooth, &diff,
774 &tmp);
775 stat_task->sa_time_diff = tmp;
776 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
777 sign < 0? "-" : "+",
778 tv2ms(&diff),
779 sa_time_diff_sign < 0? "-" : "+",
780 tv2ms(&stat_task->sa_time_diff)
781 );
782 out:
783 stat_task->sa_time_diff_sign = sa_time_diff_sign;
784 }
785
786 static int update_item(int itemnum, char *buf)
787 {
788 long unsigned sec, usec;
789
790 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
791 return 1;
792 free(stat_item_values[itemnum]);
793 stat_item_values[itemnum] = para_strdup(buf);
794 stat_client_write_item(itemnum);
795 switch (itemnum) {
796 case SI_STATUS_FLAGS:
797 stat_task->vss_status = 0;
798 if (strchr(buf, 'N'))
799 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
800 if (strchr(buf, 'P'))
801 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
802 break;
803 case SI_OFFSET:
804 stat_task->offset_seconds = atoi(buf);
805 break;
806 case SI_SECONDS_TOTAL:
807 stat_task->length_seconds = atoi(buf);
808 break;
809 case SI_STREAM_START:
810 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
811 stat_task->server_stream_start.tv_sec = sec;
812 stat_task->server_stream_start.tv_usec = usec;
813 }
814 break;
815 case SI_CURRENT_TIME:
816 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
817 struct timeval tv = {sec, usec};
818 compute_time_diff(&tv);
819 }
820 break;
821 case SI_FORMAT:
822 stat_task->current_audio_format_num
823 = get_audio_format_num(buf);
824 }
825 return 1;
826 }
827
828 static int parse_stream_command(const char *txt, char **cmd)
829 {
830 int ret, len;
831 char *re, *p = strchr(txt, ':');
832
833 if (!p)
834 return -E_MISSING_COLON;
835 *cmd = p + 1;
836 len = p - txt;
837 re = malloc(len + 1);
838 strncpy(re, txt, len);
839 re[len] = '\0';
840 ret = get_matching_audio_format_nums(re);
841 free(re);
842 return ret;
843 }
844
845 static int add_filter(int format, char *cmdline)
846 {
847 struct audio_format_info *a = &afi[format];
848 int filter_num, nf = a->num_filters;
849 void *cfg;
850
851 filter_num = check_filter_arg(cmdline, &cfg);
852 if (filter_num < 0)
853 return filter_num;
854 a->filter_conf = para_realloc(a->filter_conf,
855 (nf + 1) * sizeof(void *));
856 a->filter_nums = para_realloc(a->filter_nums,
857 (nf + 1) * sizeof(unsigned));
858 a->filter_nums[nf] = filter_num;
859 a->filter_conf[nf] = cfg;
860 a->num_filters++;
861 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
862 filter_get(filter_num)->name);
863 return filter_num;
864 }
865
866 static int parse_writer_args(void)
867 {
868 int i, ret;
869 char *cmd;
870 struct audio_format_info *a;
871
872 for (i = 0; i < conf.writer_given; i++) {
873 void *wconf;
874 int j, nw, writer_num, af_mask;
875
876 ret = parse_stream_command(conf.writer_arg[i], &cmd);
877 if (ret < 0)
878 return ret;
879 af_mask = ret;
880 FOR_EACH_AUDIO_FORMAT(j) {
881 a = afi + j;
882 if ((af_mask & (1 << j)) == 0) /* no match */
883 continue;
884 wconf = check_writer_arg_or_die(cmd, &writer_num);
885 nw = a->num_writers;
886 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
887 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
888 a->writer_nums[nw] = writer_num;
889 a->writer_conf[nw] = wconf;
890 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
891 nw, writer_names[writer_num]);
892 a->num_writers++;
893 }
894 }
895 /* Use default writer for audio formats which are not yet set up. */
896 FOR_EACH_AUDIO_FORMAT(i) {
897 void *writer_conf;
898 int writer_num;
899 a = afi + i;
900 if (a->num_writers > 0)
901 continue; /* already set up */
902 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
903 a->writer_nums = para_malloc(sizeof(int));
904 a->writer_nums[0] = writer_num;
905 a->writer_conf = para_malloc(sizeof(void *));
906 a->writer_conf[0] = writer_conf;
907 a->num_writers = 1;
908 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
909 writer_names[writer_num]);
910 }
911 return 1;
912 }
913
914 static int parse_receiver_args(void)
915 {
916 int i, ret, receiver_num;
917 char *cmd = NULL;
918 struct audio_format_info *a;
919
920 for (i = conf.receiver_given - 1; i >= 0; i--) {
921 char *arg;
922 int j, af_mask;
923
924 ret = parse_stream_command(conf.receiver_arg[i], &arg);
925 if (ret < 0)
926 goto out;
927 af_mask = ret;
928 FOR_EACH_AUDIO_FORMAT(j) {
929 a = afi + j;
930 if ((af_mask & (1 << j)) == 0) /* no match */
931 continue;
932 /*
933 * If multiple receivers are given for this audio format, the
934 * last one wins and we have to free the previous receiver
935 * config here. Since we are iterating backwards, the winning
936 * receiver arg is in fact the first one given.
937 */
938 if (a->receiver_conf)
939 a->receiver->free_config(a->receiver_conf);
940 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
941 ret = -E_RECV_SYNTAX;
942 if (!a->receiver_conf)
943 goto out;
944 a->receiver = receivers + receiver_num;
945 }
946 }
947 /*
948 * Use the first available receiver with no arguments for those audio
949 * formats for which no receiver was specified.
950 */
951 cmd = para_strdup(receivers[0].name);
952 FOR_EACH_AUDIO_FORMAT(i) {
953 a = &afi[i];
954 if (a->receiver_conf)
955 continue;
956 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
957 if (!a->receiver_conf)
958 return -E_RECV_SYNTAX;
959 a->receiver = &receivers[receiver_num];
960 }
961 FOR_EACH_AUDIO_FORMAT(i) {
962 a = afi + i;
963 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
964 audio_formats[i], a->receiver->name);
965 }
966 ret = 1;
967 out:
968 free(cmd);
969 return ret;
970 }
971
972 static int init_default_filters(void)
973 {
974 int i, ret = 1;
975
976 FOR_EACH_AUDIO_FORMAT(i) {
977 struct audio_format_info *a = &afi[i];
978 char *tmp;
979 int j;
980
981 if (a->num_filters)
982 continue; /* no default -- nothing to to */
983 /*
984 * udp and dccp streams are fec-encoded, so add fecdec as the
985 * first filter.
986 */
987 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
988 strcmp(afi[i].receiver->name, "dccp") == 0) {
989 tmp = para_strdup("fecdec");
990 add_filter(i, tmp);
991 free(tmp);
992 if (ret < 0)
993 goto out;
994 }
995 /* add "dec" to audio format name */
996 tmp = make_message("%sdec", audio_formats[i]);
997 for (j = 0; filter_get(j); j++)
998 if (!strcmp(tmp, filter_get(j)->name))
999 break;
1000 free(tmp);
1001 ret = -E_UNSUPPORTED_FILTER;
1002 if (!filter_get(j))
1003 goto out;
1004 tmp = para_strdup(filter_get(j)->name);
1005 ret = add_filter(i, tmp);
1006 free(tmp);
1007 if (ret < 0)
1008 goto out;
1009 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1010 filter_get(j)->name);
1011 }
1012 out:
1013 return ret;
1014 }
1015
1016 static int parse_filter_args(void)
1017 {
1018 int i, j, ret, af_mask, num_matches;
1019
1020 for (i = 0; i < conf.filter_given; i++) {
1021 char *arg;
1022 ret = parse_stream_command(conf.filter_arg[i], &arg);
1023 if (ret < 0)
1024 goto out;
1025 af_mask = ret;
1026 num_matches = 0;
1027 FOR_EACH_AUDIO_FORMAT(j) {
1028 if ((af_mask & (1 << j)) == 0) /* no match */
1029 continue;
1030 ret = add_filter(j, arg);
1031 if (ret < 0)
1032 goto out;
1033 num_matches++;
1034 }
1035 if (num_matches == 0)
1036 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1037 conf.filter_arg[i]);
1038 }
1039 ret = init_default_filters(); /* use default values for the rest */
1040 out:
1041 return ret;
1042 }
1043
1044 static int parse_stream_args(void)
1045 {
1046 int ret;
1047
1048 ret = parse_receiver_args();
1049 if (ret < 0)
1050 return ret;
1051 ret = parse_filter_args();
1052 if (ret < 0)
1053 return ret;
1054 ret = parse_writer_args();
1055 if (ret < 0)
1056 return ret;
1057 return 1;
1058 }
1059
1060 /* does not unlink socket on errors */
1061 static void init_local_sockets(struct command_task *ct)
1062 {
1063 if (conf.socket_given)
1064 socket_name = para_strdup(conf.socket_arg);
1065 else {
1066 char *hn = para_hostname();
1067 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1068 hn);
1069 free(hn);
1070 }
1071 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1072 if (conf.force_given)
1073 unlink(socket_name);
1074 ct->fd[0] = create_local_socket(socket_name, 0);
1075 ct->fd[1] = create_local_socket(socket_name,
1076 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1077 if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1078 return;
1079 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1080 exit(EXIT_FAILURE);
1081 }
1082
1083 static int signal_post_select(struct sched *s, void *context)
1084 {
1085 struct signal_task *st = context;
1086 int ret, signum;
1087
1088 ret = task_get_notification(st->task);
1089 if (ret < 0)
1090 return ret;
1091 signum = para_next_signal(&s->rfds);
1092 switch (signum) {
1093 case SIGINT:
1094 case SIGTERM:
1095 case SIGHUP:
1096 PARA_NOTICE_LOG("received signal %d\n", signum);
1097 task_notify_all(s, E_AUDIOD_SIGNAL);
1098 return -E_AUDIOD_SIGNAL;
1099 }
1100 return 0;
1101 }
1102
1103 static void command_pre_select(struct sched *s, void *context)
1104 {
1105 struct command_task *ct = context;
1106 int i;
1107
1108 for (i = 0; i < 2; i++)
1109 if (ct->fd[i] >= 0)
1110 para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1111 }
1112
1113 static int command_post_select(struct sched *s, void *context)
1114 {
1115 int ret, i;
1116 struct command_task *ct = context;
1117 static struct timeval last_status_dump;
1118 struct timeval tmp, delay;
1119 bool force = false;
1120
1121 ret = task_get_notification(ct->task);
1122 if (ret < 0)
1123 return ret;
1124 for (i = 0; i < 2; i++) {
1125 if (ct->fd[i] < 0)
1126 continue;
1127 ret = handle_connect(ct->fd[i], &s->rfds);
1128 if (ret < 0) {
1129 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1130 if (ret == -E_AUDIOD_TERM) {
1131 task_notify_all(s, -ret);
1132 return ret;
1133 }
1134 } else if (ret > 0)
1135 force = true;
1136 }
1137 if (force == true)
1138 goto dump;
1139
1140 /* if last status dump was less than 500ms ago, do nothing */
1141 delay.tv_sec = 0;
1142 delay.tv_usec = 500 * 1000;
1143 tv_add(&last_status_dump, &delay, &tmp);
1144 if (tv_diff(now, &tmp, NULL) < 0)
1145 return 0;
1146
1147 /*
1148 * If last status dump was more than 5s ago, force update. Otherwise,
1149 * update only those items that have changed.
1150 */
1151 delay.tv_sec = 5;
1152 delay.tv_usec = 0;
1153 tv_add(&last_status_dump, &delay, &tmp);
1154 if (tv_diff(now, &tmp, NULL) > 0)
1155 force = true;
1156 dump:
1157 audiod_status_dump(force);
1158 last_status_dump = *now;
1159 return 1;
1160 }
1161
1162 static void init_command_task(struct command_task *ct)
1163 {
1164 init_local_sockets(ct); /* doesn't return on errors */
1165
1166 ct->task = task_register(&(struct task_info) {
1167 .name = "command",
1168 .pre_select = command_pre_select,
1169 .post_select = command_post_select,
1170 .context = ct,
1171 }, &sched);
1172 }
1173
1174 static void close_stat_pipe(void)
1175 {
1176 if (!stat_task->ct)
1177 return;
1178 task_reap(&stat_task->ct->task);
1179 client_close(stat_task->ct);
1180 stat_task->ct = NULL;
1181 clear_and_dump_items();
1182 stat_task->length_seconds = 0;
1183 stat_task->offset_seconds = 0;
1184 stat_task->vss_status = 0;
1185 stat_task->current_audio_format_num = -1;
1186 audiod_status_dump(true);
1187 }
1188
1189 /* avoid busy loop if server is down */
1190 static void set_stat_task_restart_barrier(unsigned seconds)
1191 {
1192 struct timeval delay = {seconds, 0};
1193 tv_add(now, &delay, &stat_task->restart_barrier);
1194 }
1195
1196 static bool must_close_slot(int slot_num)
1197 {
1198 struct slot_info *s = &slot[slot_num];
1199 struct audio_format_info *a = afi + s->format;
1200 int i;
1201
1202 if (s->format < 0)
1203 return false;
1204 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1205 return false;
1206 for (i = 0; i < a->num_filters; i++)
1207 if (s->fns && task_status(s->fns[i].task) >= 0)
1208 return false;
1209 if (a->num_writers > 0) {
1210 for (i = 0; i < a->num_writers; i++)
1211 if (s->wns && task_status(s->wns[i].task) >= 0)
1212 return false;
1213 } else {
1214 if (s->wns && task_status(s->wns[0].task) >= 0)
1215 return false;
1216 }
1217 return true;
1218 }
1219
1220 static void close_slot(int slot_num)
1221 {
1222 struct slot_info *s = slot + slot_num;
1223
1224 PARA_INFO_LOG("closing slot %d\n", slot_num);
1225 close_writers(s);
1226 close_filters(s);
1227 close_receiver(slot_num);
1228 clear_slot(slot_num);
1229 }
1230
1231 static void close_unused_slots(void)
1232 {
1233 int i;
1234 bool dump = false;
1235
1236 FOR_EACH_SLOT(i)
1237 if (must_close_slot(i)) {
1238 close_slot(i);
1239 dump = true;
1240 }
1241 if (dump)
1242 audiod_status_dump(true);
1243 }
1244
1245 /*
1246 * Cleanup all resources.
1247 *
1248 * This performs various cleanups, removes the audiod socket and closes the
1249 * connection to para_server.
1250 */
1251 static void audiod_cleanup(void)
1252 {
1253 if (socket_name)
1254 unlink(socket_name);
1255 close_stat_pipe();
1256 close_unused_slots();
1257 audiod_cmdline_parser_free(&conf);
1258 close_stat_clients();
1259 free(uid_whitelist);
1260 }
1261
1262 /*
1263 * Check if any receivers/filters/writers need to be started and do so if
1264 * necessary.
1265 */
1266 static void start_stop_decoders(void)
1267 {
1268 int ret;
1269 struct slot_info *sl;
1270
1271 close_unused_slots();
1272 if (audiod_status != AUDIOD_ON ||
1273 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1274 return notify_receivers(E_NOT_PLAYING);
1275 if (!must_start_decoder())
1276 return;
1277 ret = open_receiver(stat_task->current_audio_format_num);
1278 if (ret < 0) {
1279 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1280 return;
1281 }
1282 sl = slot + ret;
1283 open_filters(sl);
1284 open_writers(sl);
1285 activate_grab_clients(&sched);
1286 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1287 audiod_status_dump(true);
1288 }
1289
1290 static void status_pre_select(struct sched *s, void *context)
1291 {
1292 struct status_task *st = context;
1293 int i, ret, cafn = stat_task->current_audio_format_num;
1294
1295 if (must_start_decoder())
1296 goto min_delay;
1297 FOR_EACH_SLOT(i)
1298 if (must_close_slot(i))
1299 goto min_delay;
1300 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1301 if (ret > 0)
1302 goto min_delay;
1303 if (st->ct && audiod_status == AUDIOD_OFF)
1304 goto min_delay;
1305 if (!st->ct && audiod_status != AUDIOD_OFF)
1306 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1307 if (cafn >= 0)
1308 sched_request_barrier(&afi[cafn].restart_barrier, s);
1309 /*
1310 * If para_server is playing we'd like to have a smooth time display
1311 * even if we are running in standby mode. So we request a timeout that
1312 * expires at the next full second.
1313 */
1314 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1315 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1316 return;
1317 min_delay:
1318 sched_min_delay(s);
1319 }
1320
1321 /* restart the client task if necessary */
1322 static int status_post_select(struct sched *s, void *context)
1323 {
1324 struct status_task *st = context;
1325 int ret;
1326
1327 ret = task_get_notification(st->task);
1328 if (ret < 0)
1329 return ret;
1330 if (audiod_status == AUDIOD_OFF) {
1331 if (!st->ct)
1332 goto out;
1333 if (task_status(st->ct->task) >= 0) {
1334 task_notify(st->ct->task, E_AUDIOD_OFF);
1335 goto out;
1336 }
1337 close_stat_pipe();
1338 st->clock_diff_count = conf.clock_diff_count_arg;
1339 goto out;
1340 }
1341 if (st->ct) {
1342 char *buf;
1343 size_t sz;
1344
1345 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1346 if (ret < 0) {
1347 close_stat_pipe();
1348 goto out;
1349 }
1350 if (st->ct->status != CL_EXECUTING)
1351 goto out;
1352 if (ret == 0) {
1353 struct timeval diff;
1354 tv_diff(now, &st->last_status_read, &diff);
1355 if (diff.tv_sec > 61)
1356 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1357 goto out;
1358 }
1359 btr_merge(st->btrn, st->min_iqs);
1360 sz = btr_next_buffer(st->btrn, &buf);
1361 ret = for_each_stat_item(buf, sz, update_item);
1362 if (ret < 0) {
1363 task_notify(st->ct->task, -ret);
1364 goto out;
1365 }
1366 if (sz != ret) {
1367 btr_consume(st->btrn, sz - ret);
1368 st->last_status_read = *now;
1369 st->min_iqs = 0;
1370 } else /* current status item crosses buffers */
1371 st->min_iqs = sz + 1;
1372 goto out;
1373 }
1374 btr_drain(st->btrn);
1375 st->current_audio_format_num = -1;
1376 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1377 goto out;
1378 if (st->clock_diff_count) { /* get status only one time */
1379 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1380 int argc = 5;
1381 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1382 st->clock_diff_count--;
1383 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1384 set_stat_task_restart_barrier(2);
1385
1386 } else {
1387 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1388 int argc = 4;
1389 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1390 set_stat_task_restart_barrier(5);
1391 }
1392 free(stat_item_values[SI_BASENAME]);
1393 stat_item_values[SI_BASENAME] = para_strdup(
1394 "no connection to para_server");
1395 stat_client_write_item(SI_BASENAME);
1396 st->last_status_read = *now;
1397 out:
1398 start_stop_decoders();
1399 return 0;
1400 }
1401
1402 static void init_status_task(struct status_task *st)
1403 {
1404 memset(st, 0, sizeof(struct status_task));
1405 st->sa_time_diff_sign = 1;
1406 st->clock_diff_count = conf.clock_diff_count_arg;
1407 st->current_audio_format_num = -1;
1408 st->btrn = btr_new_node(&(struct btr_node_description)
1409 EMBRACE(.name = "stat"));
1410
1411 stat_task->task = task_register(&(struct task_info) {
1412 .name = "stat",
1413 .pre_select = status_pre_select,
1414 .post_select = status_post_select,
1415 .context = stat_task,
1416 }, &sched);
1417 }
1418
1419 static void set_initial_status(void)
1420 {
1421 audiod_status = AUDIOD_ON;
1422 if (!conf.mode_given)
1423 return;
1424 if (!strcmp(conf.mode_arg, "sb")) {
1425 audiod_status = AUDIOD_STANDBY;
1426 return;
1427 }
1428 if (!strcmp(conf.mode_arg, "off")) {
1429 audiod_status = AUDIOD_OFF;
1430 return;
1431 }
1432 if (strcmp(conf.mode_arg, "on"))
1433 PARA_WARNING_LOG("invalid mode\n");
1434 }
1435
1436 __noreturn static void print_help_and_die(void)
1437 {
1438 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1439 bool d = conf.detailed_help_given;
1440 unsigned flags;
1441
1442 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1443 ggo_print_help(&h, flags);
1444
1445 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1446 print_receiver_helps(flags);
1447 print_filter_helps(flags);
1448 print_writer_helps(flags);
1449 exit(0);
1450 }
1451
1452 /**
1453 * Lookup the given UID in the whitelist.
1454 *
1455 * The whitelist is the array of arguments to the --user-allow opion. If the
1456 * option was not given, the array is empty, in which case the check succeeds.
1457 *
1458 * \param uid User ID to look up.
1459 *
1460 * \return True if --user-allow was not given, or if uid matches an element of
1461 * the whitelist.
1462 */
1463 bool uid_is_whitelisted(uid_t uid)
1464 {
1465 int i;
1466
1467 if (!conf.user_allow_given)
1468 return true;
1469 for (i = 0; i < conf.user_allow_given; i++)
1470 if (uid == uid_whitelist[i])
1471 return true;
1472 return false;
1473 }
1474
1475 /**
1476 * the main function of para_audiod
1477 *
1478 * \param argc usual argument count
1479 * \param argv usual argument vector
1480 *
1481 * \return EXIT_SUCCESS or EXIT_FAILURE
1482 *
1483 * \sa para_audiod(1)
1484 * */
1485 int main(int argc, char *argv[])
1486 {
1487 int ret, i;
1488 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1489 struct audiod_cmdline_parser_params params = {
1490 .override = 0,
1491 .initialize = 1,
1492 .check_required = 0,
1493 .check_ambiguity = 0,
1494 .print_errors = 1
1495 };
1496
1497 valid_fd_012();
1498 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1499 daemon_set_loglevel(conf.loglevel_arg);
1500 version_handle_flag("audiod", conf.version_given);
1501 /* init receivers/filters/writers early to make help work */
1502 recv_init();
1503 filter_init();
1504 writer_init();
1505 if (conf.help_given || conf.detailed_help_given)
1506 print_help_and_die();
1507 daemon_set_priority(conf.priority_arg);
1508 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1509 parse_config_or_die();
1510 if (daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1511 conf.logfile_given)) {
1512 for (i = 0; i < conf.log_color_given; i++)
1513 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1514 }
1515 init_random_seed_or_die();
1516 daemon_set_flag(DF_LOG_TIME);
1517 daemon_set_flag(DF_LOG_HOSTNAME);
1518 daemon_set_flag(DF_LOG_LL);
1519 if (conf.log_timing_given)
1520 daemon_set_flag(DF_LOG_TIMING);
1521 if (conf.logfile_given) {
1522 daemon_set_logfile(conf.logfile_arg);
1523 daemon_open_log_or_die();
1524 }
1525 ret = parse_stream_args();
1526 if (ret < 0) {
1527 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1528 exit(EXIT_FAILURE);
1529 }
1530 daemon_log_welcome("audiod");
1531 daemon_set_start_time();
1532 set_initial_status();
1533 FOR_EACH_SLOT(i)
1534 clear_slot(i);
1535 setup_signal_handling();
1536
1537 init_status_task(stat_task);
1538 init_command_task(cmd_task);
1539
1540 if (conf.daemon_given)
1541 daemonize(false /* parent exits immediately */);
1542
1543 signal_task->task = task_register(&(struct task_info) {
1544 .name = "signal",
1545 .pre_select = signal_pre_select,
1546 .post_select = signal_post_select,
1547 .context = signal_task,
1548 }, &sched);
1549
1550 sched.default_timeout.tv_sec = 2;
1551 sched.default_timeout.tv_usec = 999 * 1000;
1552 ret = schedule(&sched);
1553 audiod_cleanup();
1554 sched_shutdown(&sched);
1555 signal_shutdown(signal_task);
1556
1557 if (ret < 0)
1558 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1559 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1560 }