paraslash 0.7.1
[paraslash.git] / audiod.c
1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2
3 /** \file audiod.c The paraslash's audio daemon. */
4
5 #include <netinet/in.h>
6 #include <sys/socket.h>
7 #include <regex.h>
8 #include <sys/types.h>
9 #include <arpa/inet.h>
10 #include <sys/un.h>
11 #include <netdb.h>
12 #include <signal.h>
13 #include <pwd.h>
14 #include <lopsub.h>
15
16 #include "audiod.lsg.h"
17 #include "recv_cmd.lsg.h"
18 #include "para.h"
19 #include "error.h"
20 #include "lsu.h"
21 #include "crypt.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "buffer_tree.h"
25 #include "recv.h"
26 #include "filter.h"
27 #include "grab_client.h"
28 #include "client.h"
29 #include "audiod.h"
30 #include "net.h"
31 #include "daemon.h"
32 #include "string.h"
33 #include "fd.h"
34 #include "write.h"
35 #include "signal.h"
36 #include "version.h"
37
38 /** Array of error strings. */
39 DEFINE_PARA_ERRLIST;
40
41 static struct lls_parse_result *lpr;
42 #define CMD_PTR (lls_cmd(0, audiod_suite))
43 #define OPT_RESULT(_name) (lls_opt_result(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, lpr))
44 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
45 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
46 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
47
48 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
49 /** define the array containing all supported audio formats */
50 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
51
52 /** Defines how audiod handles one supported audio format. */
53 struct audio_format_info {
54 /** the receiver for this audio format */
55 int receiver_num;
56 /** Parsed receiver command line. */
57 struct lls_parse_result *receiver_lpr;
58 /** the number of filters that should be activated for this audio format */
59 unsigned int num_filters;
60 /** Array of filter numbers to be activated. */
61 unsigned *filter_nums;
62 /** Pointer to the array of filter configurations. */
63 void **filter_conf;
64 /** Parsed filter command line, one parse result per filter. */
65 struct lls_parse_result **filter_lpr;
66 /** the number of filters that should be activated for this audio format */
67 unsigned int num_writers;
68 /** Array of writer IDs to be activated. */
69 int *wids;
70 /** Parsed writer command line(s) */
71 struct lls_parse_result **writer_lpr;
72 /** do not start receiver/filters/writer before this time */
73 struct timeval restart_barrier;
74 };
75
76 /* Describes one instance of a receiver-filter-writer chain. */
77 struct slot_info {
78 /* Number of the audio format in this slot. */
79 int format;
80 /* The stream_start status item announced by para_server. */
81 struct timeval server_stream_start;
82 /* The offset status item announced by para_server. */
83 unsigned offset_seconds;
84 /* The seconds_total status item announced by para_server. */
85 unsigned seconds_total;
86 /* The receiver info associated with this slot. */
87 struct receiver_node *receiver_node;
88 /* The array of filter nodes. */
89 struct filter_node *fns;
90 /* The array of writers attached to the last filter. */
91 struct writer_node *wns;
92 };
93
94 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
95 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
96
97 /** Maximal number of simultaneous instances. */
98 #define MAX_STREAM_SLOTS 5
99
100 /** Iterate over all slots. */
101 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
102
103 /**
104 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
105 * be associated with a receiver/filter/writer triple. This array holds all
106 * information on the status of these slots.
107 */
108 struct slot_info slot[MAX_STREAM_SLOTS];
109
110 /** The vss status flags audiod is interested in. */
111 enum vss_status_flags {
112 /** Whether the 'N' flag is set. */
113 VSS_STATUS_FLAG_NEXT = 1,
114 /** The 'P' flag is set. */
115 VSS_STATUS_FLAG_PLAYING = 2,
116 };
117
118 /**
119 * The scheduler instance of para_audiod.
120 *
121 * This is needed also in audiod_command.c (for the tasks command), so it can
122 * not be made static.
123 */
124 struct sched sched = {.timeout = 0};
125
126 /* The task for obtaining para_server's status (para_client stat). */
127 struct status_task {
128 /** The associated task structure of audiod. */
129 struct task *task;
130 /** Client data associated with the stat task. */
131 struct client_task *ct;
132 /** Do not restart client command until this time. */
133 struct timeval restart_barrier;
134 /** Last time we received status data from para_server. */
135 struct timeval last_status_read;
136 size_t min_iqs;
137 /** The offset value announced by para_server. */
138 int offset_seconds;
139 /** The length of the current audio file as announced by para_server. */
140 int length_seconds;
141 /** The start of the current stream from the view of para_server. */
142 struct timeval server_stream_start;
143 /** The average time deviation between para_server and para_audiod. */
144 struct timeval sa_time_diff;
145 /** Whether client time is ahead of server time. */
146 int sa_time_diff_sign;
147 /** The 'P' and the 'N' flags as announced by para_server. */
148 enum vss_status_flags vss_status;
149 /** Number of times the clock difference is to be checked. */
150 unsigned clock_diff_count;
151 /** When to start the next check for clock difference. */
152 struct timeval clock_diff_barrier;
153 /** Number of the audio format as announced by para_server. */
154 int current_audio_format_num;
155 /* The status task btrn is the child of the client task. */
156 struct btr_node *btrn;
157 };
158
159 /** The array of status items sent by para_server. */
160 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
161
162 /**
163 * The current mode of operation (AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY).
164 * Set by the on/off/cycle commands.
165 */
166 int audiod_status = AUDIOD_ON;
167
168 static char *socket_name;
169 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
170 static struct signal_task *signal_task;
171 static struct status_task status_task_struct;
172 static uid_t *uid_whitelist;
173
174 /**
175 * The task that calls the status command of para_server.
176 *
177 * \sa \ref struct status_task.
178 */
179 static struct status_task *stat_task = &status_task_struct;
180
181 struct command_task {
182 /** The local listening socket. */
183 int fd;
184 /** The associated task structure. */
185 struct task *task;
186 };
187
188 /** Iterate over all supported audio formats. */
189 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
190
191 /**
192 * Get the audio format number.
193 *
194 * \param name The name of the audio format.
195 *
196 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
197 * \a name is not a supported audio format.
198 */
199 static int get_audio_format_num(const char *name)
200 {
201 int i;
202
203 while (para_isspace(*name))
204 name++;
205 FOR_EACH_AUDIO_FORMAT(i)
206 if (!strcmp(name, audio_formats[i]))
207 return i;
208 return -E_UNSUPPORTED_AUDIO_FORMAT;
209 }
210
211 /**
212 * Return the flags for the \a decoder_flags status item.
213 *
214 * Allocates a string which contains one octal digit per slot. Bit zero (value
215 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
216 * have the analogous meaning for filter and writer, respectively.
217 *
218 * \return String that must be freed by the caller.
219 */
220 __malloc char *audiod_get_decoder_flags(void)
221 {
222 int i;
223 char flags[MAX_STREAM_SLOTS + 1];
224
225 FOR_EACH_SLOT(i) {
226 struct slot_info *s = &slot[i];
227 char flag = '0';
228 if (s->receiver_node)
229 flag += 1;
230 if (s->fns)
231 flag += 2;
232 if (s->wns)
233 flag += 4;
234 flags[i] = flag;
235 }
236 flags[MAX_STREAM_SLOTS] = '\0';
237 return para_strdup(flags);
238 }
239
240 static int get_matching_audio_format_nums(const char *re)
241 {
242 int i, ret;
243 regex_t preg;
244
245 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
246 if (ret < 0)
247 return ret;
248 ret = 0;
249 FOR_EACH_AUDIO_FORMAT(i)
250 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
251 ret |= (1 << i);
252 regfree(&preg);
253 return ret;
254 }
255
256 static int get_play_time_slot_num(void)
257 {
258 int i, oldest_slot = -1;
259 struct timeval oldest_wstime = {0, 0};
260
261 FOR_EACH_SLOT(i) {
262 struct slot_info *s = &slot[i];
263 struct timeval wstime;
264 if (!s->wns || !s->wns[0].btrn)
265 continue;
266 btr_get_node_start(s->wns[0].btrn, &wstime);
267 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
268 continue;
269 oldest_wstime = wstime;
270 oldest_slot = i;
271 }
272 return oldest_slot;
273 }
274
275 /**
276 * Compute the play time based on information of the current slot.
277 *
278 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
279 * from the status items received from para_server and the start time of the
280 * (first) writer of the current slot.
281 *
282 * It has to take into account that the stream was probably not started at
283 * the beginning of the file, that the clock between the server and the client
284 * host may differ and that playback of the stream was delayed, e.g. because
285 * the prebuffer filter is used in the filter configuration.
286 *
287 * If no writer is active, for example because para_audiod runs in standby
288 * mode, an approximation based only on the status items is computed and the
289 * returned string is prefixed with "~".
290 *
291 * \return A string that must be freed by the caller.
292 */
293 char *get_time_string(void)
294 {
295 int ret, seconds = 0, length = stat_task->length_seconds;
296 struct timeval *tmp, sum, sss, /* server stream start */
297 rstime, /* receiver start time */
298 wstime, /* writer start time */
299 wtime, /* now - writer start */
300 rskip; /* receiver start - sss */
301 int slot_num = get_play_time_slot_num();
302 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
303 bool writer_active = s && s->wns && s->wns[0].btrn;
304 char *msg;
305
306 if (audiod_status == AUDIOD_OFF)
307 goto empty;
308 if (stat_task->server_stream_start.tv_sec == 0) {
309 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
310 goto out; /* server is about to change file */
311 if (length > 0) /* paused */
312 return NULL;
313 goto empty; /* stopped */
314 }
315 /*
316 * Valid status items and playing, set length and tmp to the stream
317 * start. We use the writer start time from the slot info and fall back
318 * to the info from current status items if no writer is active yet.
319 */
320 tmp = &stat_task->server_stream_start;
321 if (writer_active) {
322 btr_get_node_start(s->wns[0].btrn, &wstime);
323 if (wstime.tv_sec != 0) { /* writer wrote something */
324 if (s->server_stream_start.tv_sec == 0) {
325 /* copy status info to slot */
326 s->server_stream_start = stat_task->server_stream_start;
327 s->offset_seconds = stat_task->offset_seconds;
328 s->seconds_total = stat_task->length_seconds;
329 }
330 length = s->seconds_total;
331 tmp = &s->server_stream_start;
332 }
333 }
334 if (stat_task->sa_time_diff_sign > 0)
335 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
336 else
337 tv_add(tmp, &stat_task->sa_time_diff, &sss);
338 if (!writer_active) {
339 struct timeval diff;
340 tv_diff(now, &sss, &diff);
341 seconds = diff.tv_sec + stat_task->offset_seconds;
342 goto out;
343 }
344 tv_diff(now, &wstime, &wtime);
345 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
346 seconds = s->offset_seconds;
347 if (s->receiver_node->btrn) {
348 btr_get_node_start(s->receiver_node->btrn, &rstime);
349 ret = tv_diff(&rstime, &sss, &rskip);
350 if (ret > 0 && rskip.tv_sec > 2) {
351 /* audiod was started in the middle of the stream */
352 tv_add(&wtime, &rskip, &sum);
353 seconds += sum.tv_sec;
354 } else
355 seconds += wtime.tv_sec;
356 } else
357 seconds += wtime.tv_sec;
358 out:
359 seconds = PARA_MIN(seconds, length);
360 seconds = PARA_MAX(seconds, 0);
361 msg = make_message(
362 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
363 s? "" : "~",
364 seconds / 60,
365 seconds % 60,
366 (length - seconds) / 60,
367 (length - seconds) % 60,
368 length? (seconds * 100 + length / 2) / length : 0,
369 length / 60,
370 length % 60
371 );
372 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
373 return msg;
374 empty:
375 return para_strdup(NULL);
376 }
377
378 static void parse_config_or_die(void)
379 {
380 int i, ret;
381 uint32_t n;
382
383 ret = lsu_merge_config_file_options(OPT_STRING_VAL(CONFIG_FILE),
384 "audiod.conf", &lpr, CMD_PTR, audiod_suite, 0U /* flags */);
385 if (ret < 0) {
386 PARA_EMERG_LOG("failed to parse config file: %s\n",
387 para_strerror(-ret));
388 exit(EXIT_FAILURE);
389 }
390 daemon_set_loglevel(OPT_UINT32_VAL(LOGLEVEL));
391 n = OPT_GIVEN(USER_ALLOW);
392 if (n == 0)
393 return;
394 uid_whitelist = arr_alloc(n, sizeof(uid_t));
395 for (i = 0; i < n; i++) {
396 const char *arg = lls_string_val(i, OPT_RESULT(USER_ALLOW));
397 int32_t val;
398 struct passwd *pw;
399 ret = para_atoi32(arg, &val);
400 if (ret >= 0) {
401 uid_whitelist[i] = val;
402 continue;
403 }
404 pw = getpwnam(arg);
405 if (!pw) {
406 PARA_EMERG_LOG("invalid username: %s\n", arg);
407 exit(EXIT_FAILURE);
408 }
409 uid_whitelist[i] = pw->pw_uid;
410 }
411 }
412
413 static void setup_signal_handling(void)
414 {
415 signal_task = signal_init_or_die();
416 para_install_sighandler(SIGINT);
417 para_install_sighandler(SIGTERM);
418 para_install_sighandler(SIGHUP);
419 para_sigaction(SIGPIPE, SIG_IGN);
420 }
421
422 static void clear_slot(int slot_num)
423 {
424 struct slot_info *s = &slot[slot_num];
425
426 PARA_INFO_LOG("clearing slot %d\n", slot_num);
427 memset(s, 0, sizeof(struct slot_info));
428 s->format = -1;
429 }
430
431 static void close_receiver(int slot_num)
432 {
433 struct slot_info *s = &slot[slot_num];
434 struct audio_format_info *a;
435
436 if (s->format < 0 || !s->receiver_node)
437 return;
438 a = &afi[s->format];
439 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
440 audio_formats[s->format], slot_num);
441 RECEIVER(a)->close(s->receiver_node);
442 btr_remove_node(&s->receiver_node->btrn);
443 task_reap(&s->receiver_node->task);
444 free(s->receiver_node);
445 s->receiver_node = NULL;
446 if (audiod_status == AUDIOD_ON)
447 stat_task->current_audio_format_num = -1;
448 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
449 &a->restart_barrier);
450 }
451
452 static void writer_cleanup(struct writer_node *wn)
453 {
454 if (!wn)
455 return;
456 PARA_INFO_LOG("closing %s\n", writer_name(wn->wid));
457 writer_get(wn->wid)->close(wn);
458 btr_remove_node(&wn->btrn);
459 task_reap(&wn->task);
460 }
461
462 static void close_writers(struct slot_info *s)
463 {
464 struct audio_format_info *a;
465 int i;
466
467 if (s->format < 0)
468 return;
469 assert(s->wns);
470 a = afi + s->format;
471 if (a->num_writers == 0)
472 writer_cleanup(s->wns);
473 else {
474 for (i = 0; i < a->num_writers; i++)
475 writer_cleanup(s->wns + i);
476 }
477 free(s->wns);
478 s->wns = NULL;
479 }
480
481 static void notify_writers(int error)
482 {
483 int i;
484
485 FOR_EACH_SLOT(i) {
486 struct slot_info *s = slot + i;
487 struct audio_format_info *a;
488 int j;
489
490 if (s->format < 0)
491 continue;
492 a = afi + s->format;
493 for (j = 0; j < a->num_writers; j++)
494 task_notify(s->wns[j].task, error);
495 }
496 }
497
498 static void close_filters(struct slot_info *s)
499 {
500 int i;
501 struct audio_format_info *a = afi + s->format;
502 if (a->num_filters == 0)
503 return;
504 for (i = a->num_filters - 1; i >= 0; i--) {
505 struct filter_node *fn = s->fns + i;
506 const struct filter *f;
507
508 if (!fn)
509 continue;
510 f = filter_get(fn->filter_num);
511 if (f->close)
512 f->close(fn);
513 btr_remove_node(&fn->btrn);
514 task_reap(&fn->task);
515 }
516 free(s->fns);
517 s->fns = NULL;
518 }
519
520 static void notify_receivers(int error)
521 {
522 int i;
523
524 FOR_EACH_SLOT(i) {
525 struct slot_info *s = slot + i;
526 if (s->format < 0)
527 continue;
528 if (!s->receiver_node)
529 continue;
530 task_notify(s->receiver_node->task, error);
531 }
532 }
533
534 static int get_empty_slot(void)
535 {
536 int i;
537 struct slot_info *s;
538
539 FOR_EACH_SLOT(i) {
540 s = &slot[i];
541 if (s->format < 0) {
542 clear_slot(i);
543 return i;
544 }
545 if (s->wns || s->receiver_node || s->fns)
546 continue;
547 clear_slot(i);
548 return i;
549 }
550 return -E_NO_MORE_SLOTS;
551 }
552
553 static void open_filters(struct slot_info *s)
554 {
555 struct audio_format_info *a = afi + s->format;
556 struct filter_node *fn;
557 int nf = a->num_filters;
558 struct btr_node *parent;
559 int i;
560
561 if (nf == 0)
562 return;
563 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
564 assert(s->fns == NULL);
565 s->fns = zalloc(nf * sizeof(struct filter_node));
566 parent = s->receiver_node->btrn;
567 for (i = 0; i < nf; i++) {
568 char buf[20];
569 const char *name;
570 const struct filter *f = filter_get(a->filter_nums[i]);
571 fn = s->fns + i;
572 fn->filter_num = a->filter_nums[i];
573 fn->conf = a->filter_conf[i];
574 fn->lpr = a->filter_lpr[i];
575 name = filter_name(fn->filter_num);
576 fn->btrn = btr_new_node(&(struct btr_node_description)
577 EMBRACE(.name = name, .parent = parent,
578 .handler = f->execute, .context = fn));
579
580 if (f->open)
581 f->open(fn);
582 sprintf(buf, "%s (slot %d)", name, (int)(s - slot));
583 fn->task = task_register(&(struct task_info) {
584 .name = buf,
585 .pre_monitor = f->pre_monitor,
586 .post_monitor = f->post_monitor,
587 .context = fn,
588 }, &sched);
589 parent = fn->btrn;
590 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
591 audio_formats[s->format], i, nf, name, (int)(s - slot));
592 }
593 }
594
595 static void open_writers(struct slot_info *s)
596 {
597 int i;
598 struct audio_format_info *a = afi + s->format;
599 struct writer_node *wn;
600 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
601
602 assert(s->wns == NULL);
603 s->wns = zalloc(PARA_MAX(1U, a->num_writers)
604 * sizeof(struct writer_node));
605 for (i = 0; i < a->num_writers; i++) {
606 wn = s->wns + i;
607 wn->wid = a->wids[i];
608 wn->lpr = a->writer_lpr[i];
609 register_writer_node(wn, parent, &sched);
610 PARA_NOTICE_LOG("%s writer started in slot %d\n",
611 writer_name(a->wids[i]), (int)(s - slot));
612 }
613 }
614
615 /* returns slot num on success */
616 static int open_receiver(int format)
617 {
618 struct audio_format_info *a = &afi[format];
619 struct slot_info *s;
620 int ret, slot_num;
621 const struct receiver *r = RECEIVER(a);
622 const char *name = lls_command_name(RECEIVER_CMD(a));
623 struct receiver_node *rn;
624
625 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
626 ret = get_empty_slot();
627 if (ret < 0)
628 return ret;
629 slot_num = ret;
630 rn = zalloc(sizeof(*rn));
631 rn->receiver = r;
632 rn->lpr = a->receiver_lpr;
633 rn->btrn = btr_new_node(&(struct btr_node_description)
634 EMBRACE(.name = name, .context = rn));
635 ret = r->open(rn);
636 if (ret < 0) {
637 PARA_ERROR_LOG("could not open %s receiver\n", name);
638 btr_remove_node(&rn->btrn);
639 free(rn);
640 return ret;
641 }
642 s = &slot[slot_num];
643 s->format = format;
644 s->receiver_node = rn;
645 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
646 audio_formats[format], name, slot_num);
647 rn->task = task_register(&(struct task_info) {
648 .name = name,
649 .pre_monitor = r->pre_monitor,
650 .post_monitor = r->post_monitor,
651 .context = rn,
652 }, &sched);
653 return slot_num;
654 }
655
656 static bool receiver_running(void)
657 {
658 int i;
659 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
660
661 FOR_EACH_SLOT(i) {
662 struct slot_info *s = &slot[i];
663 long unsigned ss2 = s->server_stream_start.tv_sec;
664
665 if (!s->receiver_node)
666 continue;
667 if (task_status(s->receiver_node->task) >= 0)
668 return true;
669 if (ss1 == ss2)
670 return true;
671 }
672 return false;
673 }
674
675 /**
676 * Return the root node of the current buffer tree.
677 *
678 * This is only used for stream grabbing.
679 *
680 * \return \p NULL if no slot is currently active. If more than one buffer tree
681 * exists, the node corresponding to the most recently started receiver is
682 * returned.
683 */
684 struct btr_node *audiod_get_btr_root(void)
685 {
686 int i, newest_slot = -1;
687 struct timeval newest_rstime = {0, 0};
688
689 FOR_EACH_SLOT(i) {
690 struct slot_info *s = &slot[i];
691 struct timeval rstime;
692 if (!s->receiver_node)
693 continue;
694 if (task_status(s->receiver_node->task) < 0)
695 continue;
696 btr_get_node_start(s->receiver_node->btrn, &rstime);
697 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
698 continue;
699 newest_rstime = rstime;
700 newest_slot = i;
701 }
702 if (newest_slot == -1)
703 return NULL;
704 return slot[newest_slot].receiver_node->btrn;
705 }
706
707 /* whether a new instance of a decoder should be started. */
708 static bool must_start_decoder(void)
709 {
710 int cafn = stat_task->current_audio_format_num;
711 unsigned vs = stat_task->vss_status;
712
713 if (audiod_status != AUDIOD_ON)
714 return false;
715 if (cafn < 0)
716 return false;
717 if (!stat_task->ct)
718 return false;
719 if (vs & VSS_STATUS_FLAG_NEXT)
720 return false;
721 if (!(vs & VSS_STATUS_FLAG_PLAYING))
722 return false;
723 if (receiver_running())
724 return false;
725 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
726 return false;
727 return true;
728 }
729
730 static void compute_time_diff(const struct timeval *status_time)
731 {
732 struct timeval tmp, diff;
733 static unsigned count;
734 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
735 const struct timeval max_deviation = {0, 500 * 1000};
736 const int time_smooth = 5;
737
738 sign = tv_diff(status_time, now, &diff);
739 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
740 // sign, sa_time_diff_sign);
741 if (!count) {
742 sa_time_diff_sign = sign;
743 stat_task->sa_time_diff = diff;
744 count++;
745 goto out;
746 }
747 if (count > 5) {
748 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
749 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
750 PARA_WARNING_LOG("time diff jump: %c%lums\n",
751 s < 0? '-' : '+', tv2ms(&tmp));
752 }
753 count++;
754 sa_time_diff_sign = tv_convex_combination(
755 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
756 count > 10? sign : sign * time_smooth, &diff,
757 &tmp);
758 stat_task->sa_time_diff = tmp;
759 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
760 sign < 0? "-" : "+",
761 tv2ms(&diff),
762 sa_time_diff_sign < 0? "-" : "+",
763 tv2ms(&stat_task->sa_time_diff)
764 );
765 out:
766 stat_task->sa_time_diff_sign = sa_time_diff_sign;
767 }
768
769 static int update_item(int itemnum, char *buf)
770 {
771 long unsigned sec, usec;
772
773 if (stat_task->clock_diff_count && itemnum != SI_current_time)
774 return 1;
775 free(stat_item_values[itemnum]);
776 stat_item_values[itemnum] = para_strdup(buf);
777 stat_client_write_item(itemnum);
778 switch (itemnum) {
779 case SI_status_flags:
780 stat_task->vss_status = 0;
781 if (strchr(buf, 'N'))
782 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
783 if (strchr(buf, 'P'))
784 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
785 break;
786 case SI_offset:
787 stat_task->offset_seconds = atoi(buf);
788 break;
789 case SI_seconds_total:
790 stat_task->length_seconds = atoi(buf);
791 break;
792 case SI_stream_start:
793 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
794 stat_task->server_stream_start.tv_sec = sec;
795 stat_task->server_stream_start.tv_usec = usec;
796 }
797 break;
798 case SI_current_time:
799 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
800 struct timeval tv = {sec, usec};
801 compute_time_diff(&tv);
802 }
803 break;
804 case SI_format:
805 stat_task->current_audio_format_num
806 = get_audio_format_num(buf);
807 }
808 return 1;
809 }
810
811 static int parse_stream_command(const char *txt, const char **cmd)
812 {
813 int ret, len;
814 char *re, *p = strchr(txt, ':');
815
816 if (!p)
817 return -E_MISSING_COLON;
818 *cmd = p + 1;
819 len = p - txt;
820 re = alloc(len + 1);
821 strncpy(re, txt, len);
822 re[len] = '\0';
823 ret = get_matching_audio_format_nums(re);
824 free(re);
825 return ret;
826 }
827
828 static int add_filter(int format, const char *cmdline)
829 {
830 struct audio_format_info *a = &afi[format];
831 int filter_num, nf = a->num_filters;
832 void *cfg;
833 struct lls_parse_result *flpr;
834
835 filter_num = filter_setup(cmdline, &cfg, &flpr);
836 a->filter_lpr = arr_realloc(a->filter_lpr, nf + 1, sizeof(flpr));
837 a->filter_conf = arr_realloc(a->filter_conf, nf + 1, sizeof(void *));
838 a->filter_nums = arr_realloc(a->filter_nums, nf + 1, sizeof(unsigned));
839
840 a->filter_nums[nf] = filter_num;
841 a->filter_conf[nf] = cfg;
842 a->filter_lpr[nf] = flpr;
843 a->num_filters++;
844 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
845 filter_name(filter_num));
846 return filter_num;
847 }
848
849 static int parse_writer_args(void)
850 {
851 int i, ret;
852 const char *cmd;
853 struct audio_format_info *a;
854
855 for (i = 0; i < OPT_GIVEN(WRITER); i++) {
856 int j, nw, af_mask;
857
858 ret = parse_stream_command(lls_string_val(i,
859 OPT_RESULT(WRITER)), &cmd);
860 if (ret < 0)
861 return ret;
862 af_mask = ret;
863 FOR_EACH_AUDIO_FORMAT(j) {
864 a = afi + j;
865 if ((af_mask & (1 << j)) == 0) /* no match */
866 continue;
867 nw = a->num_writers;
868 a->wids = para_realloc(a->wids, (nw + 1) * sizeof(int));
869 a->writer_lpr = para_realloc(a->writer_lpr,
870 (nw + 1) * sizeof(struct lls_parse_result *));
871 a->wids[nw] = check_writer_arg_or_die(cmd,
872 a->writer_lpr + nw);
873 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
874 nw, writer_name(a->wids[nw]));
875 a->num_writers++;
876 }
877 }
878 /* Use default writer for audio formats which are not yet set up. */
879 FOR_EACH_AUDIO_FORMAT(i) {
880 a = afi + i;
881 if (a->num_writers > 0)
882 continue; /* already set up */
883 a->num_writers = 1;
884 a->wids = alloc(sizeof(int));
885 a->writer_lpr = alloc(sizeof(struct lls_parse_result *));
886 a->wids[0] = check_writer_arg_or_die(NULL, a->writer_lpr);
887 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
888 writer_name(a->wids[0]));
889 }
890 return 1;
891 }
892
893 static int parse_receiver_args(void)
894 {
895 int i, ret;
896 const char *arg;
897 struct audio_format_info *a;
898
899 FOR_EACH_AUDIO_FORMAT(i)
900 afi[i].receiver_num = -1;
901 for (i = OPT_GIVEN(RECEIVER) - 1; i >= 0; i--) {
902 int j, af_mask;
903
904 ret = parse_stream_command(lls_string_val(i,
905 OPT_RESULT(RECEIVER)), &arg);
906 if (ret < 0)
907 goto out;
908 af_mask = ret;
909 FOR_EACH_AUDIO_FORMAT(j) {
910 a = afi + j;
911 if ((af_mask & (1 << j)) == 0) /* no match */
912 continue;
913 /*
914 * If multiple receivers are given for this audio format, the
915 * last one wins and we have to free the previous receiver
916 * config here. Since we are iterating backwards, the winning
917 * receiver arg is in fact the first one given.
918 */
919 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
920 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
921 }
922 }
923 /*
924 * Use the default receiver for those audio formats for which no
925 * receiver was specified.
926 */
927 FOR_EACH_AUDIO_FORMAT(i) {
928 a = afi + i;
929 if (a->receiver_num >= 0)
930 continue;
931 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
932 }
933 FOR_EACH_AUDIO_FORMAT(i) {
934 a = afi + i;
935 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
936 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
937 }
938 ret = 1;
939 out:
940 return ret;
941 }
942
943 static int init_default_filters(void)
944 {
945 int i, ret = 1;
946
947 FOR_EACH_AUDIO_FORMAT(i) {
948 struct audio_format_info *a = &afi[i];
949 const char *name = lls_command_name(RECEIVER_CMD(a));
950 char *tmp;
951 int j;
952
953 if (a->num_filters)
954 continue; /* no default -- nothing to to */
955 /*
956 * udp and dccp streams are fec-encoded, so add fecdec as the
957 * first filter.
958 */
959 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
960 tmp = para_strdup("fecdec");
961 add_filter(i, tmp);
962 free(tmp);
963 if (ret < 0)
964 goto out;
965 }
966 /* add "dec" to audio format name */
967 tmp = make_message("%sdec", audio_formats[i]);
968 for (j = 1; filter_get(j); j++)
969 if (!strcmp(tmp, filter_name(j)))
970 break;
971 free(tmp);
972 ret = -E_UNSUPPORTED_FILTER;
973 if (!filter_get(j))
974 goto out;
975 tmp = para_strdup(filter_name(j));
976 ret = add_filter(i, tmp);
977 free(tmp);
978 if (ret < 0)
979 goto out;
980 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
981 filter_name(j));
982 }
983 out:
984 return ret;
985 }
986
987 static int parse_filter_args(void)
988 {
989 int i, j, ret, af_mask, num_matches;
990
991 for (i = 0; i < OPT_GIVEN(FILTER); i++) {
992 const char *arg;
993 ret = parse_stream_command(lls_string_val(i,
994 OPT_RESULT(FILTER)), &arg);
995 if (ret < 0)
996 goto out;
997 af_mask = ret;
998 num_matches = 0;
999 FOR_EACH_AUDIO_FORMAT(j) {
1000 if ((af_mask & (1 << j)) == 0) /* no match */
1001 continue;
1002 ret = add_filter(j, arg);
1003 if (ret < 0)
1004 goto out;
1005 num_matches++;
1006 }
1007 if (num_matches == 0)
1008 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1009 lls_string_val(i, OPT_RESULT(FILTER)));
1010 }
1011 ret = init_default_filters(); /* use default values for the rest */
1012 out:
1013 return ret;
1014 }
1015
1016 static int parse_stream_args(void)
1017 {
1018 int ret;
1019
1020 ret = parse_receiver_args();
1021 if (ret < 0)
1022 return ret;
1023 ret = parse_filter_args();
1024 if (ret < 0)
1025 return ret;
1026 ret = parse_writer_args();
1027 if (ret < 0)
1028 return ret;
1029 return 1;
1030 }
1031
1032 /* does not unlink socket on errors */
1033 static void init_local_socket(struct command_task *ct)
1034 {
1035 if (OPT_GIVEN(SOCKET))
1036 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
1037 else {
1038 char *hn = para_hostname();
1039 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1040 hn);
1041 free(hn);
1042 }
1043 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1044 if (OPT_GIVEN(FORCE))
1045 unlink(socket_name);
1046 ct->fd = create_local_socket(socket_name);
1047 if (ct->fd >= 0)
1048 return;
1049 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd));
1050 exit(EXIT_FAILURE);
1051 }
1052
1053 static int signal_post_monitor(struct sched *s, void *context)
1054 {
1055 struct signal_task *st = context;
1056 int ret, signum;
1057
1058 ret = task_get_notification(st->task);
1059 if (ret < 0)
1060 return ret;
1061 signum = para_next_signal();
1062 switch (signum) {
1063 case SIGINT:
1064 case SIGTERM:
1065 case SIGHUP:
1066 PARA_WARNING_LOG("terminating on signal %d\n", signum);
1067 task_notify_all(s, E_AUDIOD_SIGNAL);
1068 return -E_AUDIOD_SIGNAL;
1069 }
1070 return 0;
1071 }
1072
1073 static void command_pre_monitor(struct sched *s, void *context)
1074 {
1075 struct command_task *ct = context;
1076 sched_monitor_readfd(ct->fd, s);
1077 }
1078
1079 static int command_post_monitor(struct sched *s, void *context)
1080 {
1081 int ret;
1082 struct command_task *ct = context;
1083 static struct timeval last_status_dump;
1084 struct timeval tmp, delay;
1085 bool force = false;
1086
1087 ret = task_get_notification(ct->task);
1088 if (ret < 0)
1089 return ret;
1090 ret = dispatch_local_connection(ct->fd);
1091 if (ret < 0) {
1092 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1093 if (ret == -E_AUDIOD_TERM) {
1094 task_notify_all(s, -ret);
1095 return ret;
1096 }
1097 } else if (ret > 0)
1098 force = true;
1099 if (force == true)
1100 goto dump;
1101
1102 /* if last status dump was less than 500ms ago, do nothing */
1103 delay.tv_sec = 0;
1104 delay.tv_usec = 500 * 1000;
1105 tv_add(&last_status_dump, &delay, &tmp);
1106 if (tv_diff(now, &tmp, NULL) < 0)
1107 return 0;
1108
1109 /*
1110 * If last status dump was more than 5s ago, force update. Otherwise,
1111 * update only those items that have changed.
1112 */
1113 delay.tv_sec = 5;
1114 delay.tv_usec = 0;
1115 tv_add(&last_status_dump, &delay, &tmp);
1116 if (tv_diff(now, &tmp, NULL) > 0)
1117 force = true;
1118 dump:
1119 audiod_status_dump(force);
1120 last_status_dump = *now;
1121 return 1;
1122 }
1123
1124 static void init_command_task(struct command_task *ct)
1125 {
1126 init_local_socket(ct); /* doesn't return on errors */
1127
1128 ct->task = task_register(&(struct task_info) {
1129 .name = "command",
1130 .pre_monitor = command_pre_monitor,
1131 .post_monitor = command_post_monitor,
1132 .context = ct,
1133 }, &sched);
1134 }
1135
1136 static void close_stat_pipe(void)
1137 {
1138 if (!stat_task->ct)
1139 return;
1140 task_reap(&stat_task->ct->task);
1141 client_close(stat_task->ct);
1142 stat_task->ct = NULL;
1143 clear_and_dump_items();
1144 stat_task->length_seconds = 0;
1145 stat_task->offset_seconds = 0;
1146 stat_task->vss_status = 0;
1147 stat_task->current_audio_format_num = -1;
1148 audiod_status_dump(true);
1149 }
1150
1151 /* avoid busy loop if server is down */
1152 static void set_stat_task_restart_barrier(unsigned seconds)
1153 {
1154 struct timeval delay = {seconds, 0};
1155 tv_add(now, &delay, &stat_task->restart_barrier);
1156 }
1157
1158 static bool must_close_slot(int slot_num)
1159 {
1160 struct slot_info *s = &slot[slot_num];
1161 struct audio_format_info *a = afi + s->format;
1162 int i;
1163
1164 if (s->format < 0)
1165 return false;
1166 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1167 return false;
1168 for (i = 0; i < a->num_filters; i++)
1169 if (s->fns && task_status(s->fns[i].task) >= 0)
1170 return false;
1171 if (a->num_writers > 0) {
1172 for (i = 0; i < a->num_writers; i++)
1173 if (s->wns && task_status(s->wns[i].task) >= 0)
1174 return false;
1175 } else {
1176 if (s->wns && task_status(s->wns[0].task) >= 0)
1177 return false;
1178 }
1179 return true;
1180 }
1181
1182 static void close_slot(int slot_num)
1183 {
1184 struct slot_info *s = slot + slot_num;
1185
1186 PARA_INFO_LOG("closing slot %d\n", slot_num);
1187 close_writers(s);
1188 close_filters(s);
1189 close_receiver(slot_num);
1190 clear_slot(slot_num);
1191 }
1192
1193 static void close_unused_slots(void)
1194 {
1195 int i;
1196 bool dump = false;
1197
1198 FOR_EACH_SLOT(i)
1199 if (must_close_slot(i)) {
1200 close_slot(i);
1201 dump = true;
1202 }
1203 if (dump)
1204 audiod_status_dump(true);
1205 }
1206
1207 /*
1208 * Cleanup all resources.
1209 *
1210 * This performs various cleanups, removes the audiod socket and closes the
1211 * connection to para_server.
1212 */
1213 static void audiod_cleanup(void)
1214 {
1215 if (socket_name)
1216 unlink(socket_name);
1217 close_stat_pipe();
1218 close_unused_slots();
1219 close_stat_clients();
1220 free(uid_whitelist);
1221 }
1222
1223 /*
1224 * Check if any receivers/filters/writers need to be started and do so if
1225 * necessary.
1226 */
1227 static void start_stop_decoders(void)
1228 {
1229 int ret;
1230 struct slot_info *sl;
1231
1232 close_unused_slots();
1233 if (audiod_status != AUDIOD_ON)
1234 return notify_writers(E_NOT_PLAYING);
1235 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1236 return notify_receivers(E_NOT_PLAYING);
1237 if (!must_start_decoder())
1238 return;
1239 ret = open_receiver(stat_task->current_audio_format_num);
1240 if (ret < 0) {
1241 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1242 return;
1243 }
1244 sl = slot + ret;
1245 open_filters(sl);
1246 open_writers(sl);
1247 activate_grab_clients(&sched);
1248 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1249 audiod_status_dump(true);
1250 }
1251
1252 static void status_pre_monitor(struct sched *s, void *context)
1253 {
1254 struct status_task *st = context;
1255 int i, ret, cafn = stat_task->current_audio_format_num;
1256
1257 if (must_start_decoder())
1258 goto min_delay;
1259 FOR_EACH_SLOT(i)
1260 if (must_close_slot(i))
1261 goto min_delay;
1262 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1263 if (ret > 0)
1264 goto min_delay;
1265 if (st->ct && audiod_status == AUDIOD_OFF)
1266 goto min_delay;
1267 if (!st->ct && audiod_status != AUDIOD_OFF)
1268 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1269 if (cafn >= 0)
1270 sched_request_barrier(&afi[cafn].restart_barrier, s);
1271 /*
1272 * If para_server is playing we'd like to have a smooth time display
1273 * even if we are running in standby mode. So we request a timeout that
1274 * expires at the next full second.
1275 */
1276 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1277 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1278 return;
1279 min_delay:
1280 sched_min_delay(s);
1281 }
1282
1283 /* restart the client task if necessary */
1284 static int status_post_monitor(struct sched *s, void *context)
1285 {
1286 struct status_task *st = context;
1287 int ret;
1288
1289 ret = task_get_notification(st->task);
1290 if (ret < 0)
1291 return ret;
1292 if (audiod_status == AUDIOD_OFF) {
1293 if (!st->ct)
1294 goto out;
1295 if (task_status(st->ct->task) >= 0) {
1296 task_notify(st->ct->task, E_AUDIOD_OFF);
1297 goto out;
1298 }
1299 close_stat_pipe();
1300 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1301 goto out;
1302 }
1303 if (st->ct) {
1304 char *buf;
1305 size_t sz;
1306
1307 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1308 if (ret < 0) {
1309 close_stat_pipe();
1310 goto out;
1311 }
1312 if (st->ct->status != CL_EXECUTING)
1313 goto out;
1314 if (ret == 0) {
1315 struct timeval diff;
1316 tv_diff(now, &st->last_status_read, &diff);
1317 if (diff.tv_sec > 61)
1318 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1319 goto out;
1320 }
1321 btr_merge(st->btrn, st->min_iqs);
1322 sz = btr_next_buffer(st->btrn, &buf);
1323 ret = for_each_stat_item(buf, sz, update_item);
1324 if (ret < 0) {
1325 task_notify(st->ct->task, -ret);
1326 goto out;
1327 }
1328 if (sz != ret) {
1329 btr_consume(st->btrn, sz - ret);
1330 st->last_status_read = *now;
1331 st->min_iqs = 0;
1332 } else /* current status item crosses buffers */
1333 st->min_iqs = sz + 1;
1334 goto out;
1335 }
1336 btr_drain(st->btrn);
1337 st->current_audio_format_num = -1;
1338 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1339 goto out;
1340 if (st->clock_diff_count) { /* get status only one time */
1341 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1342 int argc = 5;
1343 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1344 st->clock_diff_count--;
1345 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1346 set_stat_task_restart_barrier(2);
1347
1348 } else {
1349 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1350 int argc = 4;
1351 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1352 set_stat_task_restart_barrier(5);
1353 }
1354 free(stat_item_values[SI_basename]);
1355 stat_item_values[SI_basename] = para_strdup(
1356 "no connection to para_server");
1357 stat_client_write_item(SI_basename);
1358 st->last_status_read = *now;
1359 out:
1360 start_stop_decoders();
1361 return 0;
1362 }
1363
1364 static void init_status_task(struct status_task *st)
1365 {
1366 memset(st, 0, sizeof(struct status_task));
1367 st->sa_time_diff_sign = 1;
1368 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1369 st->current_audio_format_num = -1;
1370 st->btrn = btr_new_node(&(struct btr_node_description)
1371 EMBRACE(.name = "stat"));
1372
1373 stat_task->task = task_register(&(struct task_info) {
1374 .name = "stat",
1375 .pre_monitor = status_pre_monitor,
1376 .post_monitor = status_post_monitor,
1377 .context = stat_task,
1378 }, &sched);
1379 }
1380
1381 static void set_initial_status(void)
1382 {
1383 audiod_status = AUDIOD_ON;
1384 if (!OPT_GIVEN(MODE))
1385 return;
1386 if (!strcmp(OPT_STRING_VAL(MODE), "sb")) {
1387 audiod_status = AUDIOD_STANDBY;
1388 return;
1389 }
1390 if (!strcmp(OPT_STRING_VAL(MODE), "off")) {
1391 audiod_status = AUDIOD_OFF;
1392 return;
1393 }
1394 if (strcmp(OPT_STRING_VAL(MODE), "on"))
1395 PARA_WARNING_LOG("invalid mode\n");
1396 }
1397
1398 /**
1399 * Lookup the given UID in the whitelist.
1400 *
1401 * The whitelist is the array of arguments to the --user-allow opion. If the
1402 * option was not given, the array is empty, in which case the check succeeds.
1403 *
1404 * \param uid User ID to look up.
1405 *
1406 * \return True if --user-allow was not given, or if uid matches an element of
1407 * the whitelist.
1408 */
1409 bool uid_is_whitelisted(uid_t uid)
1410 {
1411 int i;
1412
1413 if (!OPT_GIVEN(USER_ALLOW))
1414 return true;
1415 for (i = 0; i < OPT_GIVEN(USER_ALLOW); i++)
1416 if (uid == uid_whitelist[i])
1417 return true;
1418 return false;
1419 }
1420
1421 static void handle_help_flags(void)
1422 {
1423 char *help;
1424 bool d = OPT_GIVEN(DETAILED_HELP);
1425
1426 if (d)
1427 help = lls_long_help(CMD_PTR);
1428 else if (OPT_GIVEN(HELP))
1429 help = lls_short_help(CMD_PTR);
1430 else
1431 return;
1432 printf("%s\n", help);
1433 free(help);
1434 print_receiver_helps(d);
1435 print_filter_helps(d);
1436 print_writer_helps(d);
1437 exit(EXIT_SUCCESS);
1438 }
1439
1440 /**
1441 * the main function of para_audiod
1442 *
1443 * \param argc usual argument count
1444 * \param argv usual argument vector
1445 *
1446 * \return EXIT_SUCCESS or EXIT_FAILURE
1447 *
1448 * \sa para_audiod(1)
1449 * */
1450 int main(int argc, char *argv[])
1451 {
1452 int ret, i;
1453 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1454 char *errctx;
1455
1456 valid_fd_012();
1457 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
1458 if (ret < 0)
1459 goto out;
1460 daemon_set_loglevel(OPT_UINT32_VAL(LOGLEVEL));
1461 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
1462 OPT_STRING_VAL(GROUP));
1463 version_handle_flag("audiod", OPT_GIVEN(VERSION));
1464 handle_help_flags();
1465 parse_config_or_die();
1466 crypt_init();
1467 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
1468 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
1469 COLOR_NO, OPT_GIVEN(LOGFILE))) {
1470 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
1471 daemon_set_log_color_or_die(lls_string_val(i,
1472 OPT_RESULT(LOG_COLOR)));
1473 }
1474 daemon_set_flag(DF_LOG_TIME);
1475 daemon_set_flag(DF_LOG_HOSTNAME);
1476 daemon_set_flag(DF_LOG_LL);
1477 if (OPT_GIVEN(LOG_TIMING))
1478 daemon_set_flag(DF_LOG_TIMING);
1479 if (OPT_GIVEN(LOGFILE)) {
1480 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
1481 daemon_open_log_or_die();
1482 }
1483 ret = parse_stream_args();
1484 if (ret < 0) {
1485 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1486 exit(EXIT_FAILURE);
1487 }
1488 daemon_log_welcome("audiod");
1489 daemon_set_start_time();
1490 set_initial_status();
1491 FOR_EACH_SLOT(i)
1492 clear_slot(i);
1493 setup_signal_handling();
1494
1495 init_status_task(stat_task);
1496 init_command_task(cmd_task);
1497
1498 if (OPT_GIVEN(DAEMON))
1499 daemonize(false /* parent exits immediately */);
1500
1501 signal_task->task = task_register(&(struct task_info) {
1502 .name = "signal",
1503 .pre_monitor = signal_pre_monitor,
1504 .post_monitor = signal_post_monitor,
1505 .context = signal_task,
1506 }, &sched);
1507
1508 sched.default_timeout = 2999;
1509 ret = schedule(&sched);
1510 audiod_cleanup();
1511 sched_shutdown(&sched);
1512 signal_shutdown(signal_task);
1513 crypt_shutdown();
1514 out:
1515 lls_free_parse_result(lpr, CMD_PTR);
1516 if (errctx)
1517 PARA_ERROR_LOG("%s\n", errctx);
1518 if (ret < 0)
1519 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1520 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1521 }