Merge branch 'refs/heads/t/mp'
[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 "audiod.lsg.h"
21 #include "recv_cmd.lsg.h"
22 #include "para.h"
23 #include "error.h"
24 #include "crypt.h"
25 #include "list.h"
26 #include "sched.h"
27 #include "buffer_tree.h"
28 #include "recv.h"
29 #include "filter.h"
30 #include "grab_client.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 "signal.h"
39 #include "version.h"
40
41 /** Array of error strings. */
42 DEFINE_PARA_ERRLIST;
43
44 static struct lls_parse_result *lpr;
45 #define CMD_PTR (lls_cmd(0, audiod_suite))
46 #define OPT_RESULT(_name) (lls_opt_result(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, lpr))
47 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
48 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
49 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
50 #define ENUM_STRING_VAL(_name) (lls_enum_string_val(OPT_UINT32_VAL(_name), \
51 lls_opt(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, CMD_PTR)))
52
53 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
54 /** define the array containing all supported audio formats */
55 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
56
57 /** Defines how audiod handles one supported audio format. */
58 struct audio_format_info {
59 /** the receiver for this audio format */
60 int receiver_num;
61 /** Parsed receiver command line. */
62 struct lls_parse_result *receiver_lpr;
63 /** the number of filters that should be activated for this audio format */
64 unsigned int num_filters;
65 /** Array of filter numbers to be activated. */
66 unsigned *filter_nums;
67 /** Pointer to the array of filter configurations. */
68 void **filter_conf;
69 /** Parsed filter command line, one parse result per filter. */
70 struct lls_parse_result **filter_lpr;
71 /** the number of filters that should be activated for this audio format */
72 unsigned int num_writers;
73 /** Array of writer IDs to be activated. */
74 int *wids;
75 /** Parsed writer command line(s) */
76 struct lls_parse_result **writer_lpr;
77 /** do not start receiver/filters/writer before this time */
78 struct timeval restart_barrier;
79 };
80
81 /* Describes one instance of a receiver-filter-writer chain. */
82 struct slot_info {
83 /* Number of the audio format in this slot. */
84 int format;
85 /* The stream_start status item announced by para_server. */
86 struct timeval server_stream_start;
87 /* The offset status item announced by para_server. */
88 unsigned offset_seconds;
89 /* The seconds_total status item announced by para_server. */
90 unsigned seconds_total;
91 /* The receiver info associated with this slot. */
92 struct receiver_node *receiver_node;
93 /* The array of filter nodes. */
94 struct filter_node *fns;
95 /* The array of writers attached to the last filter. */
96 struct writer_node *wns;
97 };
98
99 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
100 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
101
102 /** Maximal number of simultaneous instances. */
103 #define MAX_STREAM_SLOTS 5
104
105 /** Iterate over all slots. */
106 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
107
108 /**
109 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
110 * be associated with a receiver/filter/writer triple. This array holds all
111 * information on the status of these slots.
112 */
113 struct slot_info slot[MAX_STREAM_SLOTS];
114
115 /** The vss status flags audiod is interested in. */
116 enum vss_status_flags {
117 /** Whether the 'N' flag is set. */
118 VSS_STATUS_FLAG_NEXT = 1,
119 /** The 'P' flag is set. */
120 VSS_STATUS_FLAG_PLAYING = 2,
121 };
122
123 /**
124 * The scheduler instance of para_audiod.
125 *
126 * This is needed also in audiod_command.c (for the tasks command), so it can
127 * not be made static.
128 */
129 struct sched sched = {.max_fileno = 0};
130
131 /* The task for obtaining para_server's status (para_client stat). */
132 struct status_task {
133 /** The associated task structure of audiod. */
134 struct task *task;
135 /** Client data associated with the stat task. */
136 struct client_task *ct;
137 /** Do not restart client command until this time. */
138 struct timeval restart_barrier;
139 /** Last time we received status data from para_server. */
140 struct timeval last_status_read;
141 size_t min_iqs;
142 /** The offset value announced by para_server. */
143 int offset_seconds;
144 /** The length of the current audio file as announced by para_server. */
145 int length_seconds;
146 /** The start of the current stream from the view of para_server. */
147 struct timeval server_stream_start;
148 /** The average time deviation between para_server and para_audiod. */
149 struct timeval sa_time_diff;
150 /** Whether client time is ahead of server time. */
151 int sa_time_diff_sign;
152 /** The 'P' and the 'N' flags as announced by para_server. */
153 enum vss_status_flags vss_status;
154 /** Number of times the clock difference is to be checked. */
155 unsigned clock_diff_count;
156 /** When to start the next check for clock difference. */
157 struct timeval clock_diff_barrier;
158 /** Number of the audio format as announced by para_server. */
159 int current_audio_format_num;
160 /* The status task btrn is the child of the client task. */
161 struct btr_node *btrn;
162 };
163
164 /** The array of status items sent by para_server. */
165 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
166
167 /**
168 * The current mode of operation (AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY).
169 * Set by the on/off/cycle commands.
170 */
171 int audiod_status = AUDIOD_ON;
172
173 static char *socket_name;
174 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
175 static struct signal_task *signal_task;
176 static struct status_task status_task_struct;
177 static uid_t *uid_whitelist;
178
179 /**
180 * The task that calls the status command of para_server.
181 *
182 * \sa \ref struct status_task.
183 */
184 static struct status_task *stat_task = &status_task_struct;
185
186 struct command_task {
187 /** The local listening socket. */
188 int fd;
189 /** The associated task structure. */
190 struct task *task;
191 };
192
193 /** Iterate over all supported audio formats. */
194 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
195
196 /**
197 * Get the audio format number.
198 *
199 * \param name The name of the audio format.
200 *
201 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
202 * \a name is not a supported audio format.
203 */
204 static int get_audio_format_num(const char *name)
205 {
206 int i;
207
208 while (para_isspace(*name))
209 name++;
210 FOR_EACH_AUDIO_FORMAT(i)
211 if (!strcmp(name, audio_formats[i]))
212 return i;
213 return -E_UNSUPPORTED_AUDIO_FORMAT;
214 }
215
216 /**
217 * Return the flags for the \a decoder_flags status item.
218 *
219 * Allocates a string which contains one octal digit per slot. Bit zero (value
220 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
221 * have the analogous meaning for filter and writer, respectively.
222 *
223 * \return String that must be freed by the caller.
224 */
225 __malloc char *audiod_get_decoder_flags(void)
226 {
227 int i;
228 char flags[MAX_STREAM_SLOTS + 1];
229
230 FOR_EACH_SLOT(i) {
231 struct slot_info *s = &slot[i];
232 char flag = '0';
233 if (s->receiver_node)
234 flag += 1;
235 if (s->fns)
236 flag += 2;
237 if (s->wns)
238 flag += 4;
239 flags[i] = flag;
240 }
241 flags[MAX_STREAM_SLOTS] = '\0';
242 return para_strdup(flags);
243 }
244
245 static int get_matching_audio_format_nums(const char *re)
246 {
247 int i, ret;
248 regex_t preg;
249
250 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
251 if (ret < 0)
252 return ret;
253 ret = 0;
254 FOR_EACH_AUDIO_FORMAT(i)
255 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
256 ret |= (1 << i);
257 regfree(&preg);
258 return ret;
259 }
260
261 static int get_play_time_slot_num(void)
262 {
263 int i, oldest_slot = -1;
264 struct timeval oldest_wstime = {0, 0};
265
266 FOR_EACH_SLOT(i) {
267 struct slot_info *s = &slot[i];
268 struct timeval wstime;
269 if (!s->wns || !s->wns[0].btrn)
270 continue;
271 btr_get_node_start(s->wns[0].btrn, &wstime);
272 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
273 continue;
274 oldest_wstime = wstime;
275 oldest_slot = i;
276 }
277 return oldest_slot;
278 }
279
280 /**
281 * Compute the play time based on information of the current slot.
282 *
283 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
284 * from the status items received from para_server and the start time of the
285 * (first) writer of the current slot.
286 *
287 * It has to take into account that the stream was probably not started at
288 * the beginning of the file, that the clock between the server and the client
289 * host may differ and that playback of the stream was delayed, e.g. because
290 * the prebuffer filter is used in the filter configuration.
291 *
292 * If no writer is active, for example because para_audiod runs in standby
293 * mode, an approximation based only on the status items is computed and the
294 * returned string is prefixed with "~".
295 *
296 * \return A string that must be freed by the caller.
297 */
298 char *get_time_string(void)
299 {
300 int ret, seconds = 0, length = stat_task->length_seconds;
301 struct timeval *tmp, sum, sss, /* server stream start */
302 rstime, /* receiver start time */
303 wstime, /* writer start time */
304 wtime, /* now - writer start */
305 rskip; /* receiver start - sss */
306 int slot_num = get_play_time_slot_num();
307 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
308 bool writer_active = s && s->wns && s->wns[0].btrn;
309 char *msg;
310
311 if (audiod_status == AUDIOD_OFF)
312 goto empty;
313 if (stat_task->server_stream_start.tv_sec == 0) {
314 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
315 goto out; /* server is about to change file */
316 if (length > 0) /* paused */
317 return NULL;
318 goto empty; /* stopped */
319 }
320 /*
321 * Valid status items and playing, set length and tmp to the stream
322 * start. We use the writer start time from the slot info and fall back
323 * to the info from current status items if no writer is active yet.
324 */
325 tmp = &stat_task->server_stream_start;
326 if (writer_active) {
327 btr_get_node_start(s->wns[0].btrn, &wstime);
328 if (wstime.tv_sec != 0) { /* writer wrote something */
329 if (s->server_stream_start.tv_sec == 0) {
330 /* copy status info to slot */
331 s->server_stream_start = stat_task->server_stream_start;
332 s->offset_seconds = stat_task->offset_seconds;
333 s->seconds_total = stat_task->length_seconds;
334 }
335 length = s->seconds_total;
336 tmp = &s->server_stream_start;
337 }
338 }
339 if (stat_task->sa_time_diff_sign > 0)
340 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
341 else
342 tv_add(tmp, &stat_task->sa_time_diff, &sss);
343 if (!writer_active) {
344 struct timeval diff;
345 tv_diff(now, &sss, &diff);
346 seconds = diff.tv_sec + stat_task->offset_seconds;
347 goto out;
348 }
349 tv_diff(now, &wstime, &wtime);
350 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
351 seconds = s->offset_seconds;
352 if (s->receiver_node->btrn) {
353 btr_get_node_start(s->receiver_node->btrn, &rstime);
354 ret = tv_diff(&rstime, &sss, &rskip);
355 if (ret > 0 && rskip.tv_sec > 2) {
356 /* audiod was started in the middle of the stream */
357 tv_add(&wtime, &rskip, &sum);
358 seconds += sum.tv_sec;
359 } else
360 seconds += wtime.tv_sec;
361 } else
362 seconds += wtime.tv_sec;
363 out:
364 seconds = PARA_MIN(seconds, length);
365 seconds = PARA_MAX(seconds, 0);
366 msg = make_message(
367 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
368 s? "" : "~",
369 seconds / 60,
370 seconds % 60,
371 (length - seconds) / 60,
372 (length - seconds) % 60,
373 length? (seconds * 100 + length / 2) / length : 0,
374 length / 60,
375 length % 60
376 );
377 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
378 return msg;
379 empty:
380 return para_strdup(NULL);
381 }
382
383 static void parse_config_or_die(void)
384 {
385 int ret;
386 char *cf, *errctx = NULL;
387 void *map;
388 size_t sz;
389
390 if (OPT_GIVEN(CONFIG_FILE))
391 cf = para_strdup(OPT_STRING_VAL(CONFIG_FILE));
392 else {
393 char *home = para_homedir();
394 cf = make_message("%s/.paraslash/audiod.conf", home);
395 free(home);
396 }
397 ret = mmap_full_file(cf, O_RDONLY, &map, &sz, NULL);
398 if (ret < 0) {
399 if (ret != -E_EMPTY && ret != -ERRNO_TO_PARA_ERROR(ENOENT))
400 goto free_cf;
401 if (ret == -ERRNO_TO_PARA_ERROR(ENOENT) && OPT_GIVEN(CONFIG_FILE))
402 goto free_cf;
403 } else {
404 int cf_argc;
405 char **cf_argv;
406 struct lls_parse_result *cf_lpr, *merged_lpr;
407 ret = lls(lls_convert_config(map, sz, NULL, &cf_argv, &errctx));
408 para_munmap(map, sz);
409 if (ret < 0)
410 goto free_cf;
411 cf_argc = ret;
412 ret = lls(lls_parse(cf_argc, cf_argv, CMD_PTR, &cf_lpr, &errctx));
413 lls_free_argv(cf_argv);
414 if (ret < 0)
415 goto free_cf;
416 ret = lls(lls_merge(lpr, cf_lpr, CMD_PTR, &merged_lpr,
417 &errctx));
418 lls_free_parse_result(cf_lpr, CMD_PTR);
419 if (ret < 0)
420 goto free_cf;
421 lls_free_parse_result(lpr, CMD_PTR);
422 lpr = merged_lpr;
423 }
424 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
425 if (OPT_GIVEN(USER_ALLOW)) {
426 uint32_t n = OPT_GIVEN(USER_ALLOW);
427 int i;
428
429 uid_whitelist = para_malloc(n * sizeof(uid_t));
430 for (i = 0; i < n; i++) {
431 const char *arg = lls_string_val(i,
432 OPT_RESULT(USER_ALLOW));
433 int32_t val;
434 struct passwd *pw;
435 ret = para_atoi32(arg, &val);
436 if (ret >= 0) {
437 uid_whitelist[i] = val;
438 continue;
439 }
440 errno = 0; /* see getpwnam(3) */
441 pw = getpwnam(arg);
442 if (!pw) {
443 PARA_EMERG_LOG("invalid username: %s\n", arg);
444 free(uid_whitelist);
445 goto free_cf;
446 }
447 uid_whitelist[i] = pw->pw_uid;
448 }
449 }
450 ret = 0;
451 free_cf:
452 free(cf);
453 if (ret < 0) {
454 if (errctx)
455 PARA_ERROR_LOG("%s\n", errctx);
456 free(errctx);
457 lls_free_parse_result(lpr, CMD_PTR);
458 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
459 exit(EXIT_FAILURE);
460 }
461 }
462
463 static void setup_signal_handling(void)
464 {
465 signal_task = signal_init_or_die();
466 para_install_sighandler(SIGINT);
467 para_install_sighandler(SIGTERM);
468 para_install_sighandler(SIGHUP);
469 para_sigaction(SIGPIPE, SIG_IGN);
470 }
471
472 static void clear_slot(int slot_num)
473 {
474 struct slot_info *s = &slot[slot_num];
475
476 PARA_INFO_LOG("clearing slot %d\n", slot_num);
477 memset(s, 0, sizeof(struct slot_info));
478 s->format = -1;
479 }
480
481 static void close_receiver(int slot_num)
482 {
483 struct slot_info *s = &slot[slot_num];
484 struct audio_format_info *a;
485
486 if (s->format < 0 || !s->receiver_node)
487 return;
488 a = &afi[s->format];
489 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
490 audio_formats[s->format], slot_num);
491 RECEIVER(a)->close(s->receiver_node);
492 btr_remove_node(&s->receiver_node->btrn);
493 task_reap(&s->receiver_node->task);
494 free(s->receiver_node);
495 s->receiver_node = NULL;
496 stat_task->current_audio_format_num = -1;
497 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
498 &a->restart_barrier);
499 }
500
501 static void writer_cleanup(struct writer_node *wn)
502 {
503 if (!wn)
504 return;
505 PARA_INFO_LOG("closing %s\n", writer_name(wn->wid));
506 writer_get(wn->wid)->close(wn);
507 btr_remove_node(&wn->btrn);
508 task_reap(&wn->task);
509 }
510
511 static void close_writers(struct slot_info *s)
512 {
513 struct audio_format_info *a;
514 int i;
515
516 if (s->format < 0)
517 return;
518 assert(s->wns);
519 a = afi + s->format;
520 if (a->num_writers == 0)
521 writer_cleanup(s->wns);
522 else {
523 for (i = 0; i < a->num_writers; i++)
524 writer_cleanup(s->wns + i);
525 }
526 free(s->wns);
527 s->wns = NULL;
528 }
529
530 static void close_filters(struct slot_info *s)
531 {
532 int i;
533 struct audio_format_info *a = afi + s->format;
534 if (a->num_filters == 0)
535 return;
536 for (i = a->num_filters - 1; i >= 0; i--) {
537 struct filter_node *fn = s->fns + i;
538 const struct filter *f;
539
540 if (!fn)
541 continue;
542 f = filter_get(fn->filter_num);
543 if (f->close)
544 f->close(fn);
545 btr_remove_node(&fn->btrn);
546 task_reap(&fn->task);
547 }
548 free(s->fns);
549 s->fns = NULL;
550 }
551
552 static void notify_receivers(int error)
553 {
554 int i;
555
556 FOR_EACH_SLOT(i) {
557 struct slot_info *s = slot + i;
558 if (s->format < 0)
559 continue;
560 if (!s->receiver_node)
561 continue;
562 task_notify(s->receiver_node->task, error);
563 }
564 }
565
566 static int get_empty_slot(void)
567 {
568 int i;
569 struct slot_info *s;
570
571 FOR_EACH_SLOT(i) {
572 s = &slot[i];
573 if (s->format < 0) {
574 clear_slot(i);
575 return i;
576 }
577 if (s->wns || s->receiver_node || s->fns)
578 continue;
579 clear_slot(i);
580 return i;
581 }
582 return -E_NO_MORE_SLOTS;
583 }
584
585 static void open_filters(struct slot_info *s)
586 {
587 struct audio_format_info *a = afi + s->format;
588 struct filter_node *fn;
589 int nf = a->num_filters;
590 struct btr_node *parent;
591 int i;
592
593 if (nf == 0)
594 return;
595 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
596 assert(s->fns == NULL);
597 s->fns = para_calloc(nf * sizeof(struct filter_node));
598 parent = s->receiver_node->btrn;
599 for (i = 0; i < nf; i++) {
600 char buf[20];
601 const char *name;
602 const struct filter *f = filter_get(a->filter_nums[i]);
603 fn = s->fns + i;
604 fn->filter_num = a->filter_nums[i];
605 fn->conf = a->filter_conf[i];
606 fn->lpr = a->filter_lpr[i];
607 name = filter_name(fn->filter_num);
608 fn->btrn = btr_new_node(&(struct btr_node_description)
609 EMBRACE(.name = name, .parent = parent,
610 .handler = f->execute, .context = fn));
611
612 if (f->open)
613 f->open(fn);
614 sprintf(buf, "%s (slot %d)", name, (int)(s - slot));
615 fn->task = task_register(&(struct task_info) {
616 .name = buf,
617 .pre_select = f->pre_select,
618 .post_select = f->post_select,
619 .context = fn,
620 }, &sched);
621 parent = fn->btrn;
622 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
623 audio_formats[s->format], i, nf, name, (int)(s - slot));
624 }
625 }
626
627 static void open_writers(struct slot_info *s)
628 {
629 int i;
630 struct audio_format_info *a = afi + s->format;
631 struct writer_node *wn;
632 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
633
634 assert(s->wns == NULL);
635 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
636 * sizeof(struct writer_node));
637 for (i = 0; i < a->num_writers; i++) {
638 wn = s->wns + i;
639 wn->wid = a->wids[i];
640 wn->lpr = a->writer_lpr[i];
641 register_writer_node(wn, parent, &sched);
642 PARA_NOTICE_LOG("%s writer started in slot %d\n",
643 writer_name(a->wids[i]), (int)(s - slot));
644 }
645 }
646
647 /* returns slot num on success */
648 static int open_receiver(int format)
649 {
650 struct audio_format_info *a = &afi[format];
651 struct slot_info *s;
652 int ret, slot_num;
653 const struct receiver *r = RECEIVER(a);
654 const char *name = lls_command_name(RECEIVER_CMD(a));
655 struct receiver_node *rn;
656
657 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
658 ret = get_empty_slot();
659 if (ret < 0)
660 return ret;
661 slot_num = ret;
662 rn = para_calloc(sizeof(*rn));
663 rn->receiver = r;
664 rn->lpr = a->receiver_lpr;
665 rn->btrn = btr_new_node(&(struct btr_node_description)
666 EMBRACE(.name = name, .context = rn));
667 ret = r->open(rn);
668 if (ret < 0) {
669 PARA_ERROR_LOG("could not open %s receiver\n", name);
670 btr_remove_node(&rn->btrn);
671 free(rn);
672 return ret;
673 }
674 s = &slot[slot_num];
675 s->format = format;
676 s->receiver_node = rn;
677 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
678 audio_formats[format], name, slot_num);
679 rn->task = task_register(&(struct task_info) {
680 .name = name,
681 .pre_select = r->pre_select,
682 .post_select = r->post_select,
683 .context = rn,
684 }, &sched);
685 return slot_num;
686 }
687
688 static bool receiver_running(void)
689 {
690 int i;
691 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
692
693 FOR_EACH_SLOT(i) {
694 struct slot_info *s = &slot[i];
695 long unsigned ss2 = s->server_stream_start.tv_sec;
696
697 if (!s->receiver_node)
698 continue;
699 if (task_status(s->receiver_node->task) >= 0)
700 return true;
701 if (ss1 == ss2)
702 return true;
703 }
704 return false;
705 }
706
707 /**
708 * Return the root node of the current buffer tree.
709 *
710 * This is only used for stream grabbing.
711 *
712 * \return \p NULL if no slot is currently active. If more than one buffer tree
713 * exists, the node corresponding to the most recently started receiver is
714 * returned.
715 */
716 struct btr_node *audiod_get_btr_root(void)
717 {
718 int i, newest_slot = -1;
719 struct timeval newest_rstime = {0, 0};
720
721 FOR_EACH_SLOT(i) {
722 struct slot_info *s = &slot[i];
723 struct timeval rstime;
724 if (!s->receiver_node)
725 continue;
726 if (task_status(s->receiver_node->task) < 0)
727 continue;
728 btr_get_node_start(s->receiver_node->btrn, &rstime);
729 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
730 continue;
731 newest_rstime = rstime;
732 newest_slot = i;
733 }
734 if (newest_slot == -1)
735 return NULL;
736 return slot[newest_slot].receiver_node->btrn;
737 }
738
739 /* whether a new instance of a decoder should be started. */
740 static bool must_start_decoder(void)
741 {
742 int cafn = stat_task->current_audio_format_num;
743 unsigned vs = stat_task->vss_status;
744
745 if (audiod_status != AUDIOD_ON)
746 return false;
747 if (cafn < 0)
748 return false;
749 if (!stat_task->ct)
750 return false;
751 if (vs & VSS_STATUS_FLAG_NEXT)
752 return false;
753 if (!(vs & VSS_STATUS_FLAG_PLAYING))
754 return false;
755 if (receiver_running())
756 return false;
757 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
758 return false;
759 return true;
760 }
761
762 static void compute_time_diff(const struct timeval *status_time)
763 {
764 struct timeval tmp, diff;
765 static unsigned count;
766 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
767 const struct timeval max_deviation = {0, 500 * 1000};
768 const int time_smooth = 5;
769
770 sign = tv_diff(status_time, now, &diff);
771 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
772 // sign, sa_time_diff_sign);
773 if (!count) {
774 sa_time_diff_sign = sign;
775 stat_task->sa_time_diff = diff;
776 count++;
777 goto out;
778 }
779 if (count > 5) {
780 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
781 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
782 PARA_WARNING_LOG("time diff jump: %lums\n",
783 s * tv2ms(&tmp));
784 }
785 count++;
786 sa_time_diff_sign = tv_convex_combination(
787 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
788 count > 10? sign : sign * time_smooth, &diff,
789 &tmp);
790 stat_task->sa_time_diff = tmp;
791 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
792 sign < 0? "-" : "+",
793 tv2ms(&diff),
794 sa_time_diff_sign < 0? "-" : "+",
795 tv2ms(&stat_task->sa_time_diff)
796 );
797 out:
798 stat_task->sa_time_diff_sign = sa_time_diff_sign;
799 }
800
801 static int update_item(int itemnum, char *buf)
802 {
803 long unsigned sec, usec;
804
805 if (stat_task->clock_diff_count && itemnum != SI_current_time)
806 return 1;
807 free(stat_item_values[itemnum]);
808 stat_item_values[itemnum] = para_strdup(buf);
809 stat_client_write_item(itemnum);
810 switch (itemnum) {
811 case SI_status_flags:
812 stat_task->vss_status = 0;
813 if (strchr(buf, 'N'))
814 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
815 if (strchr(buf, 'P'))
816 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
817 break;
818 case SI_offset:
819 stat_task->offset_seconds = atoi(buf);
820 break;
821 case SI_seconds_total:
822 stat_task->length_seconds = atoi(buf);
823 break;
824 case SI_stream_start:
825 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
826 stat_task->server_stream_start.tv_sec = sec;
827 stat_task->server_stream_start.tv_usec = usec;
828 }
829 break;
830 case SI_current_time:
831 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
832 struct timeval tv = {sec, usec};
833 compute_time_diff(&tv);
834 }
835 break;
836 case SI_format:
837 stat_task->current_audio_format_num
838 = get_audio_format_num(buf);
839 }
840 return 1;
841 }
842
843 static int parse_stream_command(const char *txt, const char **cmd)
844 {
845 int ret, len;
846 char *re, *p = strchr(txt, ':');
847
848 if (!p)
849 return -E_MISSING_COLON;
850 *cmd = p + 1;
851 len = p - txt;
852 re = malloc(len + 1);
853 strncpy(re, txt, len);
854 re[len] = '\0';
855 ret = get_matching_audio_format_nums(re);
856 free(re);
857 return ret;
858 }
859
860 static int add_filter(int format, const char *cmdline)
861 {
862 struct audio_format_info *a = &afi[format];
863 int filter_num, nf = a->num_filters;
864 void *cfg;
865 struct lls_parse_result *flpr;
866
867 filter_num = filter_setup(cmdline, &cfg, &flpr);
868 a->filter_lpr = para_realloc(a->filter_lpr,
869 (nf + 1) * sizeof(flpr));
870 a->filter_conf = para_realloc(a->filter_conf,
871 (nf + 1) * sizeof(void *));
872 a->filter_nums = para_realloc(a->filter_nums,
873 (nf + 1) * sizeof(unsigned));
874
875 a->filter_nums[nf] = filter_num;
876 a->filter_conf[nf] = cfg;
877 a->filter_lpr[nf] = flpr;
878 a->num_filters++;
879 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
880 filter_name(filter_num));
881 return filter_num;
882 }
883
884 static int parse_writer_args(void)
885 {
886 int i, ret;
887 const char *cmd;
888 struct audio_format_info *a;
889
890 for (i = 0; i < OPT_GIVEN(WRITER); i++) {
891 int j, nw, af_mask;
892
893 ret = parse_stream_command(lls_string_val(i,
894 OPT_RESULT(WRITER)), &cmd);
895 if (ret < 0)
896 return ret;
897 af_mask = ret;
898 FOR_EACH_AUDIO_FORMAT(j) {
899 a = afi + j;
900 if ((af_mask & (1 << j)) == 0) /* no match */
901 continue;
902 nw = a->num_writers;
903 a->wids = para_realloc(a->wids, (nw + 1) * sizeof(int));
904 a->writer_lpr = para_realloc(a->writer_lpr,
905 (nw + 1) * sizeof(struct lls_parse_result *));
906 a->wids[nw] = check_writer_arg_or_die(cmd,
907 a->writer_lpr + nw);
908 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
909 nw, writer_name(a->wids[nw]));
910 a->num_writers++;
911 }
912 }
913 /* Use default writer for audio formats which are not yet set up. */
914 FOR_EACH_AUDIO_FORMAT(i) {
915 a = afi + i;
916 if (a->num_writers > 0)
917 continue; /* already set up */
918 a->num_writers = 1;
919 a->wids = para_malloc(sizeof(int));
920 a->writer_lpr = para_malloc(sizeof(struct lls_parse_result *));
921 a->wids[0] = check_writer_arg_or_die(NULL, a->writer_lpr);
922 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
923 writer_name(a->wids[0]));
924 }
925 return 1;
926 }
927
928 static int parse_receiver_args(void)
929 {
930 int i, ret;
931 const char *arg;
932 struct audio_format_info *a;
933
934 FOR_EACH_AUDIO_FORMAT(i)
935 afi[i].receiver_num = -1;
936 for (i = OPT_GIVEN(RECEIVER) - 1; i >= 0; i--) {
937 int j, af_mask;
938
939 ret = parse_stream_command(lls_string_val(i,
940 OPT_RESULT(RECEIVER)), &arg);
941 if (ret < 0)
942 goto out;
943 af_mask = ret;
944 FOR_EACH_AUDIO_FORMAT(j) {
945 a = afi + j;
946 if ((af_mask & (1 << j)) == 0) /* no match */
947 continue;
948 /*
949 * If multiple receivers are given for this audio format, the
950 * last one wins and we have to free the previous receiver
951 * config here. Since we are iterating backwards, the winning
952 * receiver arg is in fact the first one given.
953 */
954 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
955 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
956 }
957 }
958 /*
959 * Use the default receiver for those audio formats for which no
960 * receiver was specified.
961 */
962 FOR_EACH_AUDIO_FORMAT(i) {
963 a = afi + i;
964 if (a->receiver_num >= 0)
965 continue;
966 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
967 }
968 FOR_EACH_AUDIO_FORMAT(i) {
969 a = afi + i;
970 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
971 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
972 }
973 ret = 1;
974 out:
975 return ret;
976 }
977
978 static int init_default_filters(void)
979 {
980 int i, ret = 1;
981
982 FOR_EACH_AUDIO_FORMAT(i) {
983 struct audio_format_info *a = &afi[i];
984 const char *name = lls_command_name(RECEIVER_CMD(a));
985 char *tmp;
986 int j;
987
988 if (a->num_filters)
989 continue; /* no default -- nothing to to */
990 /*
991 * udp and dccp streams are fec-encoded, so add fecdec as the
992 * first filter.
993 */
994 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
995 tmp = para_strdup("fecdec");
996 add_filter(i, tmp);
997 free(tmp);
998 if (ret < 0)
999 goto out;
1000 }
1001 /* add "dec" to audio format name */
1002 tmp = make_message("%sdec", audio_formats[i]);
1003 for (j = 1; filter_get(j); j++)
1004 if (!strcmp(tmp, filter_name(j)))
1005 break;
1006 free(tmp);
1007 ret = -E_UNSUPPORTED_FILTER;
1008 if (!filter_get(j))
1009 goto out;
1010 tmp = para_strdup(filter_name(j));
1011 ret = add_filter(i, tmp);
1012 free(tmp);
1013 if (ret < 0)
1014 goto out;
1015 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1016 filter_name(j));
1017 }
1018 out:
1019 return ret;
1020 }
1021
1022 static int parse_filter_args(void)
1023 {
1024 int i, j, ret, af_mask, num_matches;
1025
1026 for (i = 0; i < OPT_GIVEN(FILTER); i++) {
1027 const char *arg;
1028 ret = parse_stream_command(lls_string_val(i,
1029 OPT_RESULT(FILTER)), &arg);
1030 if (ret < 0)
1031 goto out;
1032 af_mask = ret;
1033 num_matches = 0;
1034 FOR_EACH_AUDIO_FORMAT(j) {
1035 if ((af_mask & (1 << j)) == 0) /* no match */
1036 continue;
1037 ret = add_filter(j, arg);
1038 if (ret < 0)
1039 goto out;
1040 num_matches++;
1041 }
1042 if (num_matches == 0)
1043 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1044 lls_string_val(i, OPT_RESULT(FILTER)));
1045 }
1046 ret = init_default_filters(); /* use default values for the rest */
1047 out:
1048 return ret;
1049 }
1050
1051 static int parse_stream_args(void)
1052 {
1053 int ret;
1054
1055 ret = parse_receiver_args();
1056 if (ret < 0)
1057 return ret;
1058 ret = parse_filter_args();
1059 if (ret < 0)
1060 return ret;
1061 ret = parse_writer_args();
1062 if (ret < 0)
1063 return ret;
1064 return 1;
1065 }
1066
1067 /* does not unlink socket on errors */
1068 static void init_local_socket(struct command_task *ct)
1069 {
1070 if (OPT_GIVEN(SOCKET))
1071 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
1072 else {
1073 char *hn = para_hostname();
1074 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1075 hn);
1076 free(hn);
1077 }
1078 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1079 if (OPT_GIVEN(FORCE))
1080 unlink(socket_name);
1081 ct->fd = create_local_socket(socket_name);
1082 if (ct->fd >= 0)
1083 return;
1084 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd));
1085 exit(EXIT_FAILURE);
1086 }
1087
1088 static int signal_post_select(struct sched *s, void *context)
1089 {
1090 struct signal_task *st = context;
1091 int ret, signum;
1092
1093 ret = task_get_notification(st->task);
1094 if (ret < 0)
1095 return ret;
1096 signum = para_next_signal(&s->rfds);
1097 switch (signum) {
1098 case SIGINT:
1099 case SIGTERM:
1100 case SIGHUP:
1101 PARA_NOTICE_LOG("received signal %d\n", signum);
1102 task_notify_all(s, E_AUDIOD_SIGNAL);
1103 return -E_AUDIOD_SIGNAL;
1104 }
1105 return 0;
1106 }
1107
1108 static void command_pre_select(struct sched *s, void *context)
1109 {
1110 struct command_task *ct = context;
1111 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1112 }
1113
1114 static int command_post_select(struct sched *s, void *context)
1115 {
1116 int ret;
1117 struct command_task *ct = context;
1118 static struct timeval last_status_dump;
1119 struct timeval tmp, delay;
1120 bool force = false;
1121
1122 ret = task_get_notification(ct->task);
1123 if (ret < 0)
1124 return ret;
1125 ret = handle_connect(ct->fd, &s->rfds);
1126 if (ret < 0) {
1127 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1128 if (ret == -E_AUDIOD_TERM) {
1129 task_notify_all(s, -ret);
1130 return ret;
1131 }
1132 } else if (ret > 0)
1133 force = true;
1134 if (force == true)
1135 goto dump;
1136
1137 /* if last status dump was less than 500ms ago, do nothing */
1138 delay.tv_sec = 0;
1139 delay.tv_usec = 500 * 1000;
1140 tv_add(&last_status_dump, &delay, &tmp);
1141 if (tv_diff(now, &tmp, NULL) < 0)
1142 return 0;
1143
1144 /*
1145 * If last status dump was more than 5s ago, force update. Otherwise,
1146 * update only those items that have changed.
1147 */
1148 delay.tv_sec = 5;
1149 delay.tv_usec = 0;
1150 tv_add(&last_status_dump, &delay, &tmp);
1151 if (tv_diff(now, &tmp, NULL) > 0)
1152 force = true;
1153 dump:
1154 audiod_status_dump(force);
1155 last_status_dump = *now;
1156 return 1;
1157 }
1158
1159 static void init_command_task(struct command_task *ct)
1160 {
1161 init_local_socket(ct); /* doesn't return on errors */
1162
1163 ct->task = task_register(&(struct task_info) {
1164 .name = "command",
1165 .pre_select = command_pre_select,
1166 .post_select = command_post_select,
1167 .context = ct,
1168 }, &sched);
1169 }
1170
1171 static void close_stat_pipe(void)
1172 {
1173 if (!stat_task->ct)
1174 return;
1175 task_reap(&stat_task->ct->task);
1176 client_close(stat_task->ct);
1177 stat_task->ct = NULL;
1178 clear_and_dump_items();
1179 stat_task->length_seconds = 0;
1180 stat_task->offset_seconds = 0;
1181 stat_task->vss_status = 0;
1182 stat_task->current_audio_format_num = -1;
1183 audiod_status_dump(true);
1184 }
1185
1186 /* avoid busy loop if server is down */
1187 static void set_stat_task_restart_barrier(unsigned seconds)
1188 {
1189 struct timeval delay = {seconds, 0};
1190 tv_add(now, &delay, &stat_task->restart_barrier);
1191 }
1192
1193 static bool must_close_slot(int slot_num)
1194 {
1195 struct slot_info *s = &slot[slot_num];
1196 struct audio_format_info *a = afi + s->format;
1197 int i;
1198
1199 if (s->format < 0)
1200 return false;
1201 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1202 return false;
1203 for (i = 0; i < a->num_filters; i++)
1204 if (s->fns && task_status(s->fns[i].task) >= 0)
1205 return false;
1206 if (a->num_writers > 0) {
1207 for (i = 0; i < a->num_writers; i++)
1208 if (s->wns && task_status(s->wns[i].task) >= 0)
1209 return false;
1210 } else {
1211 if (s->wns && task_status(s->wns[0].task) >= 0)
1212 return false;
1213 }
1214 return true;
1215 }
1216
1217 static void close_slot(int slot_num)
1218 {
1219 struct slot_info *s = slot + slot_num;
1220
1221 PARA_INFO_LOG("closing slot %d\n", slot_num);
1222 close_writers(s);
1223 close_filters(s);
1224 close_receiver(slot_num);
1225 clear_slot(slot_num);
1226 }
1227
1228 static void close_unused_slots(void)
1229 {
1230 int i;
1231 bool dump = false;
1232
1233 FOR_EACH_SLOT(i)
1234 if (must_close_slot(i)) {
1235 close_slot(i);
1236 dump = true;
1237 }
1238 if (dump)
1239 audiod_status_dump(true);
1240 }
1241
1242 /*
1243 * Cleanup all resources.
1244 *
1245 * This performs various cleanups, removes the audiod socket and closes the
1246 * connection to para_server.
1247 */
1248 static void audiod_cleanup(void)
1249 {
1250 if (socket_name)
1251 unlink(socket_name);
1252 close_stat_pipe();
1253 close_unused_slots();
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 = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
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 = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
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 (!OPT_GIVEN(MODE))
1419 return;
1420 if (!strcmp(OPT_STRING_VAL(MODE), "sb")) {
1421 audiod_status = AUDIOD_STANDBY;
1422 return;
1423 }
1424 if (!strcmp(OPT_STRING_VAL(MODE), "off")) {
1425 audiod_status = AUDIOD_OFF;
1426 return;
1427 }
1428 if (strcmp(OPT_STRING_VAL(MODE), "on"))
1429 PARA_WARNING_LOG("invalid mode\n");
1430 }
1431
1432 /**
1433 * Lookup the given UID in the whitelist.
1434 *
1435 * The whitelist is the array of arguments to the --user-allow opion. If the
1436 * option was not given, the array is empty, in which case the check succeeds.
1437 *
1438 * \param uid User ID to look up.
1439 *
1440 * \return True if --user-allow was not given, or if uid matches an element of
1441 * the whitelist.
1442 */
1443 bool uid_is_whitelisted(uid_t uid)
1444 {
1445 int i;
1446
1447 if (!OPT_GIVEN(USER_ALLOW))
1448 return true;
1449 for (i = 0; i < OPT_GIVEN(USER_ALLOW); i++)
1450 if (uid == uid_whitelist[i])
1451 return true;
1452 return false;
1453 }
1454
1455 static void handle_help_flags(void)
1456 {
1457 char *help;
1458 bool d = OPT_GIVEN(DETAILED_HELP);
1459
1460 if (d)
1461 help = lls_long_help(CMD_PTR);
1462 else if (OPT_GIVEN(HELP))
1463 help = lls_short_help(CMD_PTR);
1464 else
1465 return;
1466 printf("%s\n", help);
1467 free(help);
1468 print_receiver_helps(d);
1469 print_filter_helps(d);
1470 print_writer_helps(d);
1471 exit(EXIT_SUCCESS);
1472 }
1473
1474 /**
1475 * the main function of para_audiod
1476 *
1477 * \param argc usual argument count
1478 * \param argv usual argument vector
1479 *
1480 * \return EXIT_SUCCESS or EXIT_FAILURE
1481 *
1482 * \sa para_audiod(1)
1483 * */
1484 int main(int argc, char *argv[])
1485 {
1486 int ret, i;
1487 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1488 char *errctx;
1489
1490 valid_fd_012();
1491 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
1492 if (ret < 0)
1493 goto out;
1494 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
1495 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
1496 OPT_STRING_VAL(GROUP));
1497 version_handle_flag("audiod", OPT_GIVEN(VERSION));
1498 handle_help_flags();
1499 parse_config_or_die();
1500 init_random_seed_or_die();
1501 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
1502 recv_init();
1503 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
1504 COLOR_NO, OPT_GIVEN(LOGFILE))) {
1505 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
1506 daemon_set_log_color_or_die(lls_string_val(i,
1507 OPT_RESULT(LOG_COLOR)));
1508 }
1509 daemon_set_flag(DF_LOG_TIME);
1510 daemon_set_flag(DF_LOG_HOSTNAME);
1511 daemon_set_flag(DF_LOG_LL);
1512 if (OPT_GIVEN(LOG_TIMING))
1513 daemon_set_flag(DF_LOG_TIMING);
1514 if (OPT_GIVEN(LOGFILE)) {
1515 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
1516 daemon_open_log_or_die();
1517 }
1518 ret = parse_stream_args();
1519 if (ret < 0) {
1520 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1521 exit(EXIT_FAILURE);
1522 }
1523 daemon_log_welcome("audiod");
1524 daemon_set_start_time();
1525 set_initial_status();
1526 FOR_EACH_SLOT(i)
1527 clear_slot(i);
1528 setup_signal_handling();
1529
1530 init_status_task(stat_task);
1531 init_command_task(cmd_task);
1532
1533 if (OPT_GIVEN(DAEMON))
1534 daemonize(false /* parent exits immediately */);
1535
1536 signal_task->task = task_register(&(struct task_info) {
1537 .name = "signal",
1538 .pre_select = signal_pre_select,
1539 .post_select = signal_post_select,
1540 .context = signal_task,
1541 }, &sched);
1542
1543 sched.default_timeout.tv_sec = 2;
1544 sched.default_timeout.tv_usec = 999 * 1000;
1545 ret = schedule(&sched);
1546 audiod_cleanup();
1547 sched_shutdown(&sched);
1548 signal_shutdown(signal_task);
1549
1550 out:
1551 lls_free_parse_result(lpr, CMD_PTR);
1552 if (errctx)
1553 PARA_ERROR_LOG("%s\n", errctx);
1554 if (ret < 0)
1555 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1556 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1557 }