181d6ab12e6370a4e0df6b661ce20132d6036e78
[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 #include <lopsub.h>
19
20 #include "recv_cmd.lsg.h"
21 #include "para.h"
22 #include "error.h"
23 #include "crypt.h"
24 #include "audiod.cmdline.h"
25 #include "list.h"
26 #include "sched.h"
27 #include "ggo.h"
28 #include "buffer_tree.h"
29 #include "recv.h"
30 #include "filter.h"
31 #include "grab_client.h"
32 #include "client.cmdline.h"
33 #include "client.h"
34 #include "audiod.h"
35 #include "net.h"
36 #include "daemon.h"
37 #include "string.h"
38 #include "fd.h"
39 #include "write.h"
40 #include "write_common.h"
41 #include "signal.h"
42 #include "version.h"
43
44 /** Array of error strings. */
45 DEFINE_PARA_ERRLIST;
46
47 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
48 /** define the array containing all supported audio formats */
49 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
50
51 /** Defines how audiod handles one supported audio format. */
52 struct audio_format_info {
53 /** the receiver for this audio format */
54 int receiver_num;
55 /** Parsed receiver command line. */
56 struct lls_parse_result *receiver_lpr;
57 /** the number of filters that should be activated for this audio format */
58 unsigned int num_filters;
59 /** Array of filter numbers to be activated. */
60 unsigned *filter_nums;
61 /** Pointer to the array of filter configurations. */
62 void **filter_conf;
63 /** the number of filters that should be activated for this audio format */
64 unsigned int num_writers;
65 /** Array of writer numbers to be activated. */
66 int *writer_nums;
67 /** pointer to the array of writer configurations */
68 void **writer_conf;
69 /** do not start receiver/filters/writer before this time */
70 struct timeval restart_barrier;
71 };
72
73 /* Describes one instance of a receiver-filter-writer chain. */
74 struct slot_info {
75 /* Number of the audio format in this slot. */
76 int format;
77 /* The stream_start status item announced by para_server. */
78 struct timeval server_stream_start;
79 /* The offset status item announced by para_server. */
80 unsigned offset_seconds;
81 /* The seconds_total status item announced by para_server. */
82 unsigned seconds_total;
83 /* The receiver info associated with this slot. */
84 struct receiver_node *receiver_node;
85 /* The array of filter nodes. */
86 struct filter_node *fns;
87 /* The array of writers attached to the last filter. */
88 struct writer_node *wns;
89 };
90
91 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
92 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
93
94 /** Maximal number of simultaneous instances. */
95 #define MAX_STREAM_SLOTS 5
96
97 /** Iterate over all slots. */
98 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
99
100 /**
101 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
102 * be associated with a receiver/filter/writer triple. This array holds all
103 * information on the status of these slots.
104 *
105 * \sa struct slot_info
106 * */
107 struct slot_info slot[MAX_STREAM_SLOTS];
108
109 /** The vss status flags audiod is interested in. */
110 enum vss_status_flags {
111 /** Whether the 'N' flag is set. */
112 VSS_STATUS_FLAG_NEXT = 1,
113 /** The 'P' flag is set. */
114 VSS_STATUS_FLAG_PLAYING = 2,
115 };
116
117 /**
118 * The scheduler instance of para_audiod.
119 *
120 * This is needed also in audiod_command.c (for the tasks command), so it can
121 * not be made static.
122 */
123 struct sched sched = {.max_fileno = 0};
124
125 /* The task for obtaining para_server's status (para_client stat). */
126 struct status_task {
127 /** The associated task structure of audiod. */
128 struct task *task;
129 /** Client data associated with the stat task. */
130 struct client_task *ct;
131 /** Do not restart client command until this time. */
132 struct timeval restart_barrier;
133 /** Last time we received status data from para_server. */
134 struct timeval last_status_read;
135 size_t min_iqs;
136 /** The offset value announced by para_server. */
137 int offset_seconds;
138 /** The length of the current audio file as announced by para_server. */
139 int length_seconds;
140 /** The start of the current stream from the view of para_server. */
141 struct timeval server_stream_start;
142 /** The average time deviation between para_server and para_audiod. */
143 struct timeval sa_time_diff;
144 /** Whether client time is ahead of server time. */
145 int sa_time_diff_sign;
146 /** The 'P' and the 'N' flags as announced by para_server. */
147 enum vss_status_flags vss_status;
148 /** Number of times the clock difference is to be checked. */
149 unsigned clock_diff_count;
150 /** When to start the next check for clock difference. */
151 struct timeval clock_diff_barrier;
152 /** Number of the audio format as announced by para_server. */
153 int current_audio_format_num;
154 /* The status task btrn is the child of the client task. */
155 struct btr_node *btrn;
156 };
157
158 /** The array of status items sent by para_server. */
159 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
160
161 /**
162 * the current mode of operation of which can be changed by the on/off/cycle
163 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
164 */
165 int audiod_status = AUDIOD_ON;
166
167 /**
168 * the gengetopt args_info struct that holds information on all command line
169 * arguments
170 */
171 static struct audiod_args_info conf;
172
173 static char *socket_name;
174 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
175
176 static struct signal_task *signal_task;
177
178 static struct status_task status_task_struct;
179
180 static uid_t *uid_whitelist;
181
182 /**
183 * the task that calls the status command of para_server
184 *
185 * \sa struct status_task
186 */
187 static struct status_task *stat_task = &status_task_struct;
188
189 /*
190 * The task for handling audiod commands.
191 *
192 * We need two listening sockets for backward compability: on Linux systems
193 * fd[0] is an abstract socket (more precisely, a socket bound to an address in
194 * the abstract namespace), and fd[1] is the usual pathname socket. On other
195 * systems, fd[0] is negative, and only the pathname socket is used.
196 *
197 * For 0.5.x we accept connections on both sockets to make sure that old
198 * para_audioc versions can still connect. New versions use only the abstract
199 * socket. Hence after v0.6.0 we can go back to a single socket, either an
200 * abstract one (Linux) or a pathname socket (all other systems).
201 */
202 struct command_task {
203 /** The local listening sockets. */
204 int fd[2];
205 /** the associated task structure */
206 struct task *task;
207 };
208
209 /** iterate over all supported audio formats */
210 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
211
212 /**
213 * Get the audio format number.
214 *
215 * \param name The name of the audio format.
216 *
217 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
218 * \a name is not a supported audio format.
219 */
220 static int get_audio_format_num(const char *name)
221 {
222 int i;
223
224 while (para_isspace(*name))
225 name++;
226 FOR_EACH_AUDIO_FORMAT(i)
227 if (!strcmp(name, audio_formats[i]))
228 return i;
229 return -E_UNSUPPORTED_AUDIO_FORMAT;
230 }
231
232 /**
233 * Return the flags for the \a decoder_flags status item.
234 *
235 * Allocates a string which contains one octal digit per slot. Bit zero (value
236 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
237 * have the analogous meaning for filter and writer, respectively.
238 *
239 * \return String that must be freed by the caller.
240 */
241 __malloc char *audiod_get_decoder_flags(void)
242 {
243 int i;
244 char flags[MAX_STREAM_SLOTS + 1];
245
246 FOR_EACH_SLOT(i) {
247 struct slot_info *s = &slot[i];
248 char flag = '0';
249 if (s->receiver_node)
250 flag += 1;
251 if (s->fns)
252 flag += 2;
253 if (s->wns)
254 flag += 4;
255 flags[i] = flag;
256 }
257 flags[MAX_STREAM_SLOTS] = '\0';
258 return para_strdup(flags);
259 }
260
261 static int get_matching_audio_format_nums(const char *re)
262 {
263 int i, ret;
264 regex_t preg;
265
266 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
267 if (ret < 0)
268 return ret;
269 ret = 0;
270 FOR_EACH_AUDIO_FORMAT(i)
271 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
272 ret |= (1 << i);
273 regfree(&preg);
274 return ret;
275 }
276
277 static int get_play_time_slot_num(void)
278 {
279 int i, oldest_slot = -1;
280 struct timeval oldest_wstime = {0, 0};
281
282 FOR_EACH_SLOT(i) {
283 struct slot_info *s = &slot[i];
284 struct timeval wstime;
285 if (!s->wns || !s->wns[0].btrn)
286 continue;
287 btr_get_node_start(s->wns[0].btrn, &wstime);
288 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
289 continue;
290 oldest_wstime = wstime;
291 oldest_slot = i;
292 }
293 return oldest_slot;
294 }
295
296 /**
297 * Compute the play time based on information of the current slot.
298 *
299 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
300 * from the status items received from para_server and the start time of the
301 * (first) writer of the current slot.
302 *
303 * It has to take into account that the stream was probably not started at
304 * the beginning of the file, that the clock between the server and the client
305 * host may differ and that playback of the stream was delayed, e.g. because
306 * the prebuffer filter is used in the filter configuration.
307 *
308 * If no writer is active, for example because para_audiod runs in standby
309 * mode, an approximation based only on the status items is computed and the
310 * returned string is prefixed with "~".
311 *
312 * \return A string that must be freed by the caller.
313 */
314 char *get_time_string(void)
315 {
316 int ret, seconds = 0, length = stat_task->length_seconds;
317 struct timeval *tmp, sum, sss, /* server stream start */
318 rstime, /* receiver start time */
319 wstime, /* writer start time */
320 wtime, /* now - writer start */
321 rskip; /* receiver start - sss */
322 int slot_num = get_play_time_slot_num();
323 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
324 char *msg;
325
326 if (audiod_status == AUDIOD_OFF)
327 goto empty;
328 if (stat_task->server_stream_start.tv_sec == 0) {
329 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
330 goto out; /* server is about to change file */
331 if (length > 0) /* paused */
332 return NULL;
333 goto empty; /* stopped */
334 }
335 /*
336 * Valid status items and playing, set length and tmp to the stream
337 * start. We use the slot info and fall back to the info from current
338 * status items if no slot info is available.
339 */
340 tmp = &stat_task->server_stream_start;
341 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
342 btr_get_node_start(s->wns[0].btrn, &wstime);
343 if (wstime.tv_sec != 0) { /* writer wrote something */
344 if (s->server_stream_start.tv_sec == 0) {
345 /* copy status info to slot */
346 s->server_stream_start = stat_task->server_stream_start;
347 s->offset_seconds = stat_task->offset_seconds;
348 s->seconds_total = stat_task->length_seconds;
349 }
350 length = s->seconds_total;
351 tmp = &s->server_stream_start;
352 }
353 }
354 if (stat_task->sa_time_diff_sign > 0)
355 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
356 else
357 tv_add(tmp, &stat_task->sa_time_diff, &sss);
358 if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
359 struct timeval diff;
360 tv_diff(now, &sss, &diff);
361 seconds = diff.tv_sec + stat_task->offset_seconds;
362 goto out;
363 }
364 tv_diff(now, &wstime, &wtime);
365 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
366 seconds = s->offset_seconds;
367 if (s->receiver_node->btrn) {
368 btr_get_node_start(s->receiver_node->btrn, &rstime);
369 ret = tv_diff(&rstime, &sss, &rskip);
370 if (ret > 0 && rskip.tv_sec > 2) {
371 /* audiod was started in the middle of the stream */
372 tv_add(&wtime, &rskip, &sum);
373 seconds += sum.tv_sec;
374 } else
375 seconds += wtime.tv_sec;
376 } else
377 seconds += wtime.tv_sec;
378 out:
379 seconds = PARA_MIN(seconds, length);
380 seconds = PARA_MAX(seconds, 0);
381 msg = make_message(
382 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
383 s? "" : "~",
384 seconds / 60,
385 seconds % 60,
386 (length - seconds) / 60,
387 (length - seconds) % 60,
388 length? (seconds * 100 + length / 2) / length : 0,
389 length / 60,
390 length % 60
391 );
392 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
393 return msg;
394 empty:
395 return para_strdup(NULL);
396 }
397
398 static void parse_config_or_die(void)
399 {
400 int ret, i;
401 char *config_file;
402 struct audiod_cmdline_parser_params params = {
403 .override = 0,
404 .initialize = 0,
405 .check_required = 1,
406 .check_ambiguity = 0,
407 .print_errors = 1
408 };
409
410 if (conf.config_file_given)
411 config_file = para_strdup(conf.config_file_arg);
412 else {
413 char *home = para_homedir();
414 config_file = make_message("%s/.paraslash/audiod.conf", home);
415 free(home);
416 }
417 ret = file_exists(config_file);
418 if (conf.config_file_given && !ret) {
419 PARA_EMERG_LOG("can not read config file %s\n", config_file);
420 free(config_file);
421 goto err;
422 }
423 if (ret) {
424 audiod_cmdline_parser_config_file(config_file, &conf, &params);
425 daemon_set_loglevel(conf.loglevel_arg);
426 }
427 free(config_file);
428 if (conf.user_allow_given > 0) {
429 uid_whitelist = para_malloc(conf.user_allow_given
430 * sizeof(uid_t));
431 for (i = 0; i < conf.user_allow_given; i++) {
432 int32_t val;
433 struct passwd *pw;
434 ret = para_atoi32(conf.user_allow_arg[i], &val);
435 if (ret >= 0) {
436 uid_whitelist[i] = val;
437 continue;
438 }
439 errno = 0; /* see getpwnam(3) */
440 pw = getpwnam(conf.user_allow_arg[i]);
441 if (!pw) {
442 PARA_EMERG_LOG("invalid username: %s\n",
443 conf.user_allow_arg[i]);
444 goto err;
445 }
446 uid_whitelist[i] = pw->pw_uid;
447 }
448 }
449 return;
450 err:
451 exit(EXIT_FAILURE);
452 }
453
454 static void setup_signal_handling(void)
455 {
456 signal_task = signal_init_or_die();
457 para_install_sighandler(SIGINT);
458 para_install_sighandler(SIGTERM);
459 para_install_sighandler(SIGHUP);
460 para_sigaction(SIGPIPE, SIG_IGN);
461 }
462
463 static void clear_slot(int slot_num)
464 {
465 struct slot_info *s = &slot[slot_num];
466
467 PARA_INFO_LOG("clearing slot %d\n", slot_num);
468 memset(s, 0, sizeof(struct slot_info));
469 s->format = -1;
470 }
471
472 static void close_receiver(int slot_num)
473 {
474 struct slot_info *s = &slot[slot_num];
475 struct audio_format_info *a;
476
477 if (s->format < 0 || !s->receiver_node)
478 return;
479 a = &afi[s->format];
480 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
481 audio_formats[s->format], slot_num);
482 RECEIVER(a)->close(s->receiver_node);
483 btr_remove_node(&s->receiver_node->btrn);
484 task_reap(&s->receiver_node->task);
485 free(s->receiver_node);
486 s->receiver_node = NULL;
487 stat_task->current_audio_format_num = -1;
488 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
489 &a->restart_barrier);
490 }
491
492 static void writer_cleanup(struct writer_node *wn)
493 {
494 struct writer *w;
495
496 if (!wn)
497 return;
498 w = writers + wn->writer_num;
499 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
500 w->close(wn);
501 btr_remove_node(&wn->btrn);
502 task_reap(&wn->task);
503 }
504
505 static void close_writers(struct slot_info *s)
506 {
507 struct audio_format_info *a;
508 int i;
509
510 if (s->format < 0)
511 return;
512 assert(s->wns);
513 a = afi + s->format;
514 if (a->num_writers == 0)
515 writer_cleanup(s->wns);
516 else {
517 for (i = 0; i < a->num_writers; i++)
518 writer_cleanup(s->wns + i);
519 }
520 free(s->wns);
521 s->wns = NULL;
522 }
523
524 static void close_filters(struct slot_info *s)
525 {
526 int i;
527 struct audio_format_info *a = afi + s->format;
528 if (a->num_filters == 0)
529 return;
530 for (i = a->num_filters - 1; i >= 0; i--) {
531 struct filter_node *fn = s->fns + i;
532 const struct filter *f;
533
534 if (!fn)
535 continue;
536 f = filter_get(fn->filter_num);
537 if (f->close)
538 f->close(fn);
539 btr_remove_node(&fn->btrn);
540 task_reap(&fn->task);
541 }
542 free(s->fns);
543 s->fns = NULL;
544 }
545
546 static void notify_receivers(int error)
547 {
548 int i;
549
550 FOR_EACH_SLOT(i) {
551 struct slot_info *s = slot + i;
552 if (s->format < 0)
553 continue;
554 if (!s->receiver_node)
555 continue;
556 task_notify(s->receiver_node->task, error);
557 }
558 }
559
560 static int get_empty_slot(void)
561 {
562 int i;
563 struct slot_info *s;
564
565 FOR_EACH_SLOT(i) {
566 s = &slot[i];
567 if (s->format < 0) {
568 clear_slot(i);
569 return i;
570 }
571 if (s->wns || s->receiver_node || s->fns)
572 continue;
573 clear_slot(i);
574 return i;
575 }
576 return -E_NO_MORE_SLOTS;
577 }
578
579 static void open_filters(struct slot_info *s)
580 {
581 struct audio_format_info *a = afi + s->format;
582 struct filter_node *fn;
583 int nf = a->num_filters;
584 struct btr_node *parent;
585 int i;
586
587 if (nf == 0)
588 return;
589 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
590 assert(s->fns == NULL);
591 s->fns = para_calloc(nf * sizeof(struct filter_node));
592 parent = s->receiver_node->btrn;
593 for (i = 0; i < nf; i++) {
594 char buf[20];
595 const struct filter *f = filter_get(a->filter_nums[i]);
596 fn = s->fns + i;
597 fn->filter_num = a->filter_nums[i];
598 fn->conf = a->filter_conf[i];
599 fn->btrn = btr_new_node(&(struct btr_node_description)
600 EMBRACE(.name = f->name, .parent = parent,
601 .handler = f->execute, .context = fn));
602
603 if (f->open)
604 f->open(fn);
605 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
606 fn->task = task_register(&(struct task_info) {
607 .name = buf,
608 .pre_select = f->pre_select,
609 .post_select = f->post_select,
610 .context = fn,
611 }, &sched);
612 parent = fn->btrn;
613 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
614 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
615 }
616 }
617
618 static void open_writers(struct slot_info *s)
619 {
620 int i;
621 struct audio_format_info *a = afi + s->format;
622 struct writer_node *wn;
623 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
624
625 assert(s->wns == NULL);
626 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
627 * sizeof(struct writer_node));
628 for (i = 0; i < a->num_writers; i++) {
629 wn = s->wns + i;
630 wn->conf = a->writer_conf[i];
631 wn->writer_num = a->writer_nums[i];
632 register_writer_node(wn, parent, &sched);
633 PARA_NOTICE_LOG("%s writer started in slot %d\n",
634 writer_names[a->writer_nums[i]], (int)(s - slot));
635 }
636 }
637
638 /* returns slot num on success */
639 static int open_receiver(int format)
640 {
641 struct audio_format_info *a = &afi[format];
642 struct slot_info *s;
643 int ret, slot_num;
644 const struct receiver *r = RECEIVER(a);
645 const char *name = lls_command_name(RECEIVER_CMD(a));
646 struct receiver_node *rn;
647
648 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
649 ret = get_empty_slot();
650 if (ret < 0)
651 return ret;
652 slot_num = ret;
653 rn = para_calloc(sizeof(*rn));
654 rn->receiver = r;
655 rn->lpr = a->receiver_lpr;
656 rn->btrn = btr_new_node(&(struct btr_node_description)
657 EMBRACE(.name = name, .context = rn));
658 ret = r->open(rn);
659 if (ret < 0) {
660 btr_remove_node(&rn->btrn);
661 free(rn);
662 return ret;
663 }
664 s = &slot[slot_num];
665 s->format = format;
666 s->receiver_node = rn;
667 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
668 audio_formats[format], name, slot_num);
669 rn->task = task_register(&(struct task_info) {
670 .name = name,
671 .pre_select = r->pre_select,
672 .post_select = r->post_select,
673 .context = rn,
674 }, &sched);
675 return slot_num;
676 }
677
678 static bool receiver_running(void)
679 {
680 int i;
681 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
682
683 FOR_EACH_SLOT(i) {
684 struct slot_info *s = &slot[i];
685 long unsigned ss2 = s->server_stream_start.tv_sec;
686
687 if (!s->receiver_node)
688 continue;
689 if (task_status(s->receiver_node->task) >= 0)
690 return true;
691 if (ss1 == ss2)
692 return true;
693 }
694 return false;
695 }
696
697 /**
698 * Return the root node of the current buffer tree.
699 *
700 * This is only used for stream grabbing.
701 *
702 * \return \p NULL if no slot is currently active. If more than one buffer tree
703 * exists, the node corresponding to the most recently started receiver is
704 * returned.
705 */
706 struct btr_node *audiod_get_btr_root(void)
707 {
708 int i, newest_slot = -1;
709 struct timeval newest_rstime = {0, 0};
710
711 FOR_EACH_SLOT(i) {
712 struct slot_info *s = &slot[i];
713 struct timeval rstime;
714 if (!s->receiver_node)
715 continue;
716 if (task_status(s->receiver_node->task) < 0)
717 continue;
718 btr_get_node_start(s->receiver_node->btrn, &rstime);
719 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
720 continue;
721 newest_rstime = rstime;
722 newest_slot = i;
723 }
724 if (newest_slot == -1)
725 return NULL;
726 return slot[newest_slot].receiver_node->btrn;
727 }
728
729 /* whether a new instance of a decoder should be started. */
730 static bool must_start_decoder(void)
731 {
732 int cafn = stat_task->current_audio_format_num;
733 unsigned vs = stat_task->vss_status;
734
735 if (audiod_status != AUDIOD_ON)
736 return false;
737 if (cafn < 0)
738 return false;
739 if (!stat_task->ct)
740 return false;
741 if (vs & VSS_STATUS_FLAG_NEXT)
742 return false;
743 if (!(vs & VSS_STATUS_FLAG_PLAYING))
744 return false;
745 if (receiver_running())
746 return false;
747 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
748 return false;
749 return true;
750 }
751
752 static void compute_time_diff(const struct timeval *status_time)
753 {
754 struct timeval tmp, diff;
755 static unsigned count;
756 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
757 const struct timeval max_deviation = {0, 500 * 1000};
758 const int time_smooth = 5;
759
760 sign = tv_diff(status_time, now, &diff);
761 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
762 // sign, sa_time_diff_sign);
763 if (!count) {
764 sa_time_diff_sign = sign;
765 stat_task->sa_time_diff = diff;
766 count++;
767 goto out;
768 }
769 if (count > 5) {
770 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
771 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
772 PARA_WARNING_LOG("time diff jump: %lums\n",
773 s * tv2ms(&tmp));
774 }
775 count++;
776 sa_time_diff_sign = tv_convex_combination(
777 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
778 count > 10? sign : sign * time_smooth, &diff,
779 &tmp);
780 stat_task->sa_time_diff = tmp;
781 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
782 sign < 0? "-" : "+",
783 tv2ms(&diff),
784 sa_time_diff_sign < 0? "-" : "+",
785 tv2ms(&stat_task->sa_time_diff)
786 );
787 out:
788 stat_task->sa_time_diff_sign = sa_time_diff_sign;
789 }
790
791 static int update_item(int itemnum, char *buf)
792 {
793 long unsigned sec, usec;
794
795 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
796 return 1;
797 free(stat_item_values[itemnum]);
798 stat_item_values[itemnum] = para_strdup(buf);
799 stat_client_write_item(itemnum);
800 switch (itemnum) {
801 case SI_STATUS_FLAGS:
802 stat_task->vss_status = 0;
803 if (strchr(buf, 'N'))
804 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
805 if (strchr(buf, 'P'))
806 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
807 break;
808 case SI_OFFSET:
809 stat_task->offset_seconds = atoi(buf);
810 break;
811 case SI_SECONDS_TOTAL:
812 stat_task->length_seconds = atoi(buf);
813 break;
814 case SI_STREAM_START:
815 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
816 stat_task->server_stream_start.tv_sec = sec;
817 stat_task->server_stream_start.tv_usec = usec;
818 }
819 break;
820 case SI_CURRENT_TIME:
821 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
822 struct timeval tv = {sec, usec};
823 compute_time_diff(&tv);
824 }
825 break;
826 case SI_FORMAT:
827 stat_task->current_audio_format_num
828 = get_audio_format_num(buf);
829 }
830 return 1;
831 }
832
833 static int parse_stream_command(const char *txt, const char **cmd)
834 {
835 int ret, len;
836 char *re, *p = strchr(txt, ':');
837
838 if (!p)
839 return -E_MISSING_COLON;
840 *cmd = p + 1;
841 len = p - txt;
842 re = malloc(len + 1);
843 strncpy(re, txt, len);
844 re[len] = '\0';
845 ret = get_matching_audio_format_nums(re);
846 free(re);
847 return ret;
848 }
849
850 static int add_filter(int format, const char *cmdline)
851 {
852 struct audio_format_info *a = &afi[format];
853 int filter_num, nf = a->num_filters;
854 void *cfg;
855
856 filter_num = check_filter_arg(cmdline, &cfg);
857 if (filter_num < 0)
858 return filter_num;
859 a->filter_conf = para_realloc(a->filter_conf,
860 (nf + 1) * sizeof(void *));
861 a->filter_nums = para_realloc(a->filter_nums,
862 (nf + 1) * sizeof(unsigned));
863 a->filter_nums[nf] = filter_num;
864 a->filter_conf[nf] = cfg;
865 a->num_filters++;
866 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
867 filter_get(filter_num)->name);
868 return filter_num;
869 }
870
871 static int parse_writer_args(void)
872 {
873 int i, ret;
874 const char *cmd;
875 struct audio_format_info *a;
876
877 for (i = 0; i < conf.writer_given; i++) {
878 void *wconf;
879 int j, nw, writer_num, af_mask;
880
881 ret = parse_stream_command(conf.writer_arg[i], &cmd);
882 if (ret < 0)
883 return ret;
884 af_mask = ret;
885 FOR_EACH_AUDIO_FORMAT(j) {
886 a = afi + j;
887 if ((af_mask & (1 << j)) == 0) /* no match */
888 continue;
889 wconf = check_writer_arg_or_die(cmd, &writer_num);
890 nw = a->num_writers;
891 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
892 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
893 a->writer_nums[nw] = writer_num;
894 a->writer_conf[nw] = wconf;
895 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
896 nw, writer_names[writer_num]);
897 a->num_writers++;
898 }
899 }
900 /* Use default writer for audio formats which are not yet set up. */
901 FOR_EACH_AUDIO_FORMAT(i) {
902 void *writer_conf;
903 int writer_num;
904 a = afi + i;
905 if (a->num_writers > 0)
906 continue; /* already set up */
907 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
908 a->writer_nums = para_malloc(sizeof(int));
909 a->writer_nums[0] = writer_num;
910 a->writer_conf = para_malloc(sizeof(void *));
911 a->writer_conf[0] = writer_conf;
912 a->num_writers = 1;
913 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
914 writer_names[writer_num]);
915 }
916 return 1;
917 }
918
919 static int parse_receiver_args(void)
920 {
921 int i, ret;
922 const char *arg;
923 struct audio_format_info *a;
924
925 FOR_EACH_AUDIO_FORMAT(i)
926 afi[i].receiver_num = -1;
927 for (i = conf.receiver_given - 1; i >= 0; i--) {
928 int j, af_mask;
929
930 ret = parse_stream_command(conf.receiver_arg[i], &arg);
931 if (ret < 0)
932 goto out;
933 af_mask = ret;
934 FOR_EACH_AUDIO_FORMAT(j) {
935 a = afi + j;
936 if ((af_mask & (1 << j)) == 0) /* no match */
937 continue;
938 /*
939 * If multiple receivers are given for this audio format, the
940 * last one wins and we have to free the previous receiver
941 * config here. Since we are iterating backwards, the winning
942 * receiver arg is in fact the first one given.
943 */
944 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
945 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
946 }
947 }
948 /*
949 * Use the default receiver for those audio formats for which no
950 * receiver was specified.
951 */
952 FOR_EACH_AUDIO_FORMAT(i) {
953 a = afi + i;
954 if (a->receiver_num >= 0)
955 continue;
956 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
957 }
958 FOR_EACH_AUDIO_FORMAT(i) {
959 a = afi + i;
960 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
961 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
962 }
963 ret = 1;
964 out:
965 return ret;
966 }
967
968 static int init_default_filters(void)
969 {
970 int i, ret = 1;
971
972 FOR_EACH_AUDIO_FORMAT(i) {
973 struct audio_format_info *a = &afi[i];
974 const char *name = lls_command_name(RECEIVER_CMD(a));
975 char *tmp;
976 int j;
977
978 if (a->num_filters)
979 continue; /* no default -- nothing to to */
980 /*
981 * udp and dccp streams are fec-encoded, so add fecdec as the
982 * first filter.
983 */
984 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
985 tmp = para_strdup("fecdec");
986 add_filter(i, tmp);
987 free(tmp);
988 if (ret < 0)
989 goto out;
990 }
991 /* add "dec" to audio format name */
992 tmp = make_message("%sdec", audio_formats[i]);
993 for (j = 0; filter_get(j); j++)
994 if (!strcmp(tmp, filter_get(j)->name))
995 break;
996 free(tmp);
997 ret = -E_UNSUPPORTED_FILTER;
998 if (!filter_get(j))
999 goto out;
1000 tmp = para_strdup(filter_get(j)->name);
1001 ret = add_filter(i, tmp);
1002 free(tmp);
1003 if (ret < 0)
1004 goto out;
1005 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1006 filter_get(j)->name);
1007 }
1008 out:
1009 return ret;
1010 }
1011
1012 static int parse_filter_args(void)
1013 {
1014 int i, j, ret, af_mask, num_matches;
1015
1016 for (i = 0; i < conf.filter_given; i++) {
1017 const char *arg;
1018 ret = parse_stream_command(conf.filter_arg[i], &arg);
1019 if (ret < 0)
1020 goto out;
1021 af_mask = ret;
1022 num_matches = 0;
1023 FOR_EACH_AUDIO_FORMAT(j) {
1024 if ((af_mask & (1 << j)) == 0) /* no match */
1025 continue;
1026 ret = add_filter(j, arg);
1027 if (ret < 0)
1028 goto out;
1029 num_matches++;
1030 }
1031 if (num_matches == 0)
1032 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1033 conf.filter_arg[i]);
1034 }
1035 ret = init_default_filters(); /* use default values for the rest */
1036 out:
1037 return ret;
1038 }
1039
1040 static int parse_stream_args(void)
1041 {
1042 int ret;
1043
1044 ret = parse_receiver_args();
1045 if (ret < 0)
1046 return ret;
1047 ret = parse_filter_args();
1048 if (ret < 0)
1049 return ret;
1050 ret = parse_writer_args();
1051 if (ret < 0)
1052 return ret;
1053 return 1;
1054 }
1055
1056 /* does not unlink socket on errors */
1057 static void init_local_sockets(struct command_task *ct)
1058 {
1059 if (conf.socket_given)
1060 socket_name = para_strdup(conf.socket_arg);
1061 else {
1062 char *hn = para_hostname();
1063 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1064 hn);
1065 free(hn);
1066 }
1067 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1068 if (conf.force_given)
1069 unlink(socket_name);
1070 ct->fd[0] = create_local_socket(socket_name, 0);
1071 ct->fd[1] = create_local_socket(socket_name,
1072 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1073 if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1074 return;
1075 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1076 exit(EXIT_FAILURE);
1077 }
1078
1079 static int signal_post_select(struct sched *s, void *context)
1080 {
1081 struct signal_task *st = context;
1082 int ret, signum;
1083
1084 ret = task_get_notification(st->task);
1085 if (ret < 0)
1086 return ret;
1087 signum = para_next_signal(&s->rfds);
1088 switch (signum) {
1089 case SIGINT:
1090 case SIGTERM:
1091 case SIGHUP:
1092 PARA_NOTICE_LOG("received signal %d\n", signum);
1093 task_notify_all(s, E_AUDIOD_SIGNAL);
1094 return -E_AUDIOD_SIGNAL;
1095 }
1096 return 0;
1097 }
1098
1099 static void command_pre_select(struct sched *s, void *context)
1100 {
1101 struct command_task *ct = context;
1102 int i;
1103
1104 for (i = 0; i < 2; i++)
1105 if (ct->fd[i] >= 0)
1106 para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1107 }
1108
1109 static int command_post_select(struct sched *s, void *context)
1110 {
1111 int ret, i;
1112 struct command_task *ct = context;
1113 static struct timeval last_status_dump;
1114 struct timeval tmp, delay;
1115 bool force = false;
1116
1117 ret = task_get_notification(ct->task);
1118 if (ret < 0)
1119 return ret;
1120 for (i = 0; i < 2; i++) {
1121 if (ct->fd[i] < 0)
1122 continue;
1123 ret = handle_connect(ct->fd[i], &s->rfds);
1124 if (ret < 0) {
1125 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1126 if (ret == -E_AUDIOD_TERM) {
1127 task_notify_all(s, -ret);
1128 return ret;
1129 }
1130 } else if (ret > 0)
1131 force = true;
1132 }
1133 if (force == true)
1134 goto dump;
1135
1136 /* if last status dump was less than 500ms ago, do nothing */
1137 delay.tv_sec = 0;
1138 delay.tv_usec = 500 * 1000;
1139 tv_add(&last_status_dump, &delay, &tmp);
1140 if (tv_diff(now, &tmp, NULL) < 0)
1141 return 0;
1142
1143 /*
1144 * If last status dump was more than 5s ago, force update. Otherwise,
1145 * update only those items that have changed.
1146 */
1147 delay.tv_sec = 5;
1148 delay.tv_usec = 0;
1149 tv_add(&last_status_dump, &delay, &tmp);
1150 if (tv_diff(now, &tmp, NULL) > 0)
1151 force = true;
1152 dump:
1153 audiod_status_dump(force);
1154 last_status_dump = *now;
1155 return 1;
1156 }
1157
1158 static void init_command_task(struct command_task *ct)
1159 {
1160 init_local_sockets(ct); /* doesn't return on errors */
1161
1162 ct->task = task_register(&(struct task_info) {
1163 .name = "command",
1164 .pre_select = command_pre_select,
1165 .post_select = command_post_select,
1166 .context = ct,
1167 }, &sched);
1168 }
1169
1170 static void close_stat_pipe(void)
1171 {
1172 if (!stat_task->ct)
1173 return;
1174 task_reap(&stat_task->ct->task);
1175 client_close(stat_task->ct);
1176 stat_task->ct = NULL;
1177 clear_and_dump_items();
1178 stat_task->length_seconds = 0;
1179 stat_task->offset_seconds = 0;
1180 stat_task->vss_status = 0;
1181 stat_task->current_audio_format_num = -1;
1182 audiod_status_dump(true);
1183 }
1184
1185 /* avoid busy loop if server is down */
1186 static void set_stat_task_restart_barrier(unsigned seconds)
1187 {
1188 struct timeval delay = {seconds, 0};
1189 tv_add(now, &delay, &stat_task->restart_barrier);
1190 }
1191
1192 static bool must_close_slot(int slot_num)
1193 {
1194 struct slot_info *s = &slot[slot_num];
1195 struct audio_format_info *a = afi + s->format;
1196 int i;
1197
1198 if (s->format < 0)
1199 return false;
1200 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1201 return false;
1202 for (i = 0; i < a->num_filters; i++)
1203 if (s->fns && task_status(s->fns[i].task) >= 0)
1204 return false;
1205 if (a->num_writers > 0) {
1206 for (i = 0; i < a->num_writers; i++)
1207 if (s->wns && task_status(s->wns[i].task) >= 0)
1208 return false;
1209 } else {
1210 if (s->wns && task_status(s->wns[0].task) >= 0)
1211 return false;
1212 }
1213 return true;
1214 }
1215
1216 static void close_slot(int slot_num)
1217 {
1218 struct slot_info *s = slot + slot_num;
1219
1220 PARA_INFO_LOG("closing slot %d\n", slot_num);
1221 close_writers(s);
1222 close_filters(s);
1223 close_receiver(slot_num);
1224 clear_slot(slot_num);
1225 }
1226
1227 static void close_unused_slots(void)
1228 {
1229 int i;
1230 bool dump = false;
1231
1232 FOR_EACH_SLOT(i)
1233 if (must_close_slot(i)) {
1234 close_slot(i);
1235 dump = true;
1236 }
1237 if (dump)
1238 audiod_status_dump(true);
1239 }
1240
1241 /*
1242 * Cleanup all resources.
1243 *
1244 * This performs various cleanups, removes the audiod socket and closes the
1245 * connection to para_server.
1246 */
1247 static void audiod_cleanup(void)
1248 {
1249 if (socket_name)
1250 unlink(socket_name);
1251 close_stat_pipe();
1252 close_unused_slots();
1253 audiod_cmdline_parser_free(&conf);
1254 close_stat_clients();
1255 free(uid_whitelist);
1256 }
1257
1258 /*
1259 * Check if any receivers/filters/writers need to be started and do so if
1260 * necessary.
1261 */
1262 static void start_stop_decoders(void)
1263 {
1264 int ret;
1265 struct slot_info *sl;
1266
1267 close_unused_slots();
1268 if (audiod_status != AUDIOD_ON ||
1269 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1270 return notify_receivers(E_NOT_PLAYING);
1271 if (!must_start_decoder())
1272 return;
1273 ret = open_receiver(stat_task->current_audio_format_num);
1274 if (ret < 0) {
1275 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1276 return;
1277 }
1278 sl = slot + ret;
1279 open_filters(sl);
1280 open_writers(sl);
1281 activate_grab_clients(&sched);
1282 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1283 audiod_status_dump(true);
1284 }
1285
1286 static void status_pre_select(struct sched *s, void *context)
1287 {
1288 struct status_task *st = context;
1289 int i, ret, cafn = stat_task->current_audio_format_num;
1290
1291 if (must_start_decoder())
1292 goto min_delay;
1293 FOR_EACH_SLOT(i)
1294 if (must_close_slot(i))
1295 goto min_delay;
1296 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1297 if (ret > 0)
1298 goto min_delay;
1299 if (st->ct && audiod_status == AUDIOD_OFF)
1300 goto min_delay;
1301 if (!st->ct && audiod_status != AUDIOD_OFF)
1302 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1303 if (cafn >= 0)
1304 sched_request_barrier(&afi[cafn].restart_barrier, s);
1305 /*
1306 * If para_server is playing we'd like to have a smooth time display
1307 * even if we are running in standby mode. So we request a timeout that
1308 * expires at the next full second.
1309 */
1310 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1311 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1312 return;
1313 min_delay:
1314 sched_min_delay(s);
1315 }
1316
1317 /* restart the client task if necessary */
1318 static int status_post_select(struct sched *s, void *context)
1319 {
1320 struct status_task *st = context;
1321 int ret;
1322
1323 ret = task_get_notification(st->task);
1324 if (ret < 0)
1325 return ret;
1326 if (audiod_status == AUDIOD_OFF) {
1327 if (!st->ct)
1328 goto out;
1329 if (task_status(st->ct->task) >= 0) {
1330 task_notify(st->ct->task, E_AUDIOD_OFF);
1331 goto out;
1332 }
1333 close_stat_pipe();
1334 st->clock_diff_count = conf.clock_diff_count_arg;
1335 goto out;
1336 }
1337 if (st->ct) {
1338 char *buf;
1339 size_t sz;
1340
1341 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1342 if (ret < 0) {
1343 close_stat_pipe();
1344 goto out;
1345 }
1346 if (st->ct->status != CL_EXECUTING)
1347 goto out;
1348 if (ret == 0) {
1349 struct timeval diff;
1350 tv_diff(now, &st->last_status_read, &diff);
1351 if (diff.tv_sec > 61)
1352 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1353 goto out;
1354 }
1355 btr_merge(st->btrn, st->min_iqs);
1356 sz = btr_next_buffer(st->btrn, &buf);
1357 ret = for_each_stat_item(buf, sz, update_item);
1358 if (ret < 0) {
1359 task_notify(st->ct->task, -ret);
1360 goto out;
1361 }
1362 if (sz != ret) {
1363 btr_consume(st->btrn, sz - ret);
1364 st->last_status_read = *now;
1365 st->min_iqs = 0;
1366 } else /* current status item crosses buffers */
1367 st->min_iqs = sz + 1;
1368 goto out;
1369 }
1370 btr_drain(st->btrn);
1371 st->current_audio_format_num = -1;
1372 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1373 goto out;
1374 if (st->clock_diff_count) { /* get status only one time */
1375 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1376 int argc = 5;
1377 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1378 st->clock_diff_count--;
1379 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1380 set_stat_task_restart_barrier(2);
1381
1382 } else {
1383 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1384 int argc = 4;
1385 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1386 set_stat_task_restart_barrier(5);
1387 }
1388 free(stat_item_values[SI_BASENAME]);
1389 stat_item_values[SI_BASENAME] = para_strdup(
1390 "no connection to para_server");
1391 stat_client_write_item(SI_BASENAME);
1392 st->last_status_read = *now;
1393 out:
1394 start_stop_decoders();
1395 return 0;
1396 }
1397
1398 static void init_status_task(struct status_task *st)
1399 {
1400 memset(st, 0, sizeof(struct status_task));
1401 st->sa_time_diff_sign = 1;
1402 st->clock_diff_count = conf.clock_diff_count_arg;
1403 st->current_audio_format_num = -1;
1404 st->btrn = btr_new_node(&(struct btr_node_description)
1405 EMBRACE(.name = "stat"));
1406
1407 stat_task->task = task_register(&(struct task_info) {
1408 .name = "stat",
1409 .pre_select = status_pre_select,
1410 .post_select = status_post_select,
1411 .context = stat_task,
1412 }, &sched);
1413 }
1414
1415 static void set_initial_status(void)
1416 {
1417 audiod_status = AUDIOD_ON;
1418 if (!conf.mode_given)
1419 return;
1420 if (!strcmp(conf.mode_arg, "sb")) {
1421 audiod_status = AUDIOD_STANDBY;
1422 return;
1423 }
1424 if (!strcmp(conf.mode_arg, "off")) {
1425 audiod_status = AUDIOD_OFF;
1426 return;
1427 }
1428 if (strcmp(conf.mode_arg, "on"))
1429 PARA_WARNING_LOG("invalid mode\n");
1430 }
1431
1432 __noreturn static void print_help_and_die(void)
1433 {
1434 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1435 bool d = conf.detailed_help_given;
1436 unsigned flags;
1437
1438 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1439 ggo_print_help(&h, flags);
1440
1441 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1442 print_receiver_helps(flags);
1443 print_filter_helps(flags);
1444 print_writer_helps(flags);
1445 exit(0);
1446 }
1447
1448 /**
1449 * Lookup the given UID in the whitelist.
1450 *
1451 * The whitelist is the array of arguments to the --user-allow opion. If the
1452 * option was not given, the array is empty, in which case the check succeeds.
1453 *
1454 * \param uid User ID to look up.
1455 *
1456 * \return True if --user-allow was not given, or if uid matches an element of
1457 * the whitelist.
1458 */
1459 bool uid_is_whitelisted(uid_t uid)
1460 {
1461 int i;
1462
1463 if (!conf.user_allow_given)
1464 return true;
1465 for (i = 0; i < conf.user_allow_given; i++)
1466 if (uid == uid_whitelist[i])
1467 return true;
1468 return false;
1469 }
1470
1471 /**
1472 * the main function of para_audiod
1473 *
1474 * \param argc usual argument count
1475 * \param argv usual argument vector
1476 *
1477 * \return EXIT_SUCCESS or EXIT_FAILURE
1478 *
1479 * \sa para_audiod(1)
1480 * */
1481 int main(int argc, char *argv[])
1482 {
1483 int ret, i;
1484 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1485 struct audiod_cmdline_parser_params params = {
1486 .override = 0,
1487 .initialize = 1,
1488 .check_required = 0,
1489 .check_ambiguity = 0,
1490 .print_errors = 1
1491 };
1492
1493 valid_fd_012();
1494 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1495 daemon_set_loglevel(conf.loglevel_arg);
1496 version_handle_flag("audiod", conf.version_given);
1497 /* init receivers/filters/writers early to make help work */
1498 recv_init();
1499 filter_init();
1500 writer_init();
1501 if (conf.help_given || conf.detailed_help_given)
1502 print_help_and_die();
1503 daemon_set_priority(conf.priority_arg);
1504 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1505 parse_config_or_die();
1506 if (daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1507 conf.logfile_given)) {
1508 for (i = 0; i < conf.log_color_given; i++)
1509 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1510 }
1511 init_random_seed_or_die();
1512 daemon_set_flag(DF_LOG_TIME);
1513 daemon_set_flag(DF_LOG_HOSTNAME);
1514 daemon_set_flag(DF_LOG_LL);
1515 if (conf.log_timing_given)
1516 daemon_set_flag(DF_LOG_TIMING);
1517 if (conf.logfile_given) {
1518 daemon_set_logfile(conf.logfile_arg);
1519 daemon_open_log_or_die();
1520 }
1521 ret = parse_stream_args();
1522 if (ret < 0) {
1523 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1524 exit(EXIT_FAILURE);
1525 }
1526 daemon_log_welcome("audiod");
1527 daemon_set_start_time();
1528 set_initial_status();
1529 FOR_EACH_SLOT(i)
1530 clear_slot(i);
1531 setup_signal_handling();
1532
1533 init_status_task(stat_task);
1534 init_command_task(cmd_task);
1535
1536 if (conf.daemon_given)
1537 daemonize(false /* parent exits immediately */);
1538
1539 signal_task->task = task_register(&(struct task_info) {
1540 .name = "signal",
1541 .pre_select = signal_pre_select,
1542 .post_select = signal_post_select,
1543 .context = signal_task,
1544 }, &sched);
1545
1546 sched.default_timeout.tv_sec = 2;
1547 sched.default_timeout.tv_usec = 999 * 1000;
1548 ret = schedule(&sched);
1549 audiod_cleanup();
1550 sched_shutdown(&sched);
1551 signal_shutdown(signal_task);
1552
1553 if (ret < 0)
1554 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1555 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1556 }