Merge branch 'maint'
[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 btr_remove_node(&rn->btrn);
670 free(rn);
671 return ret;
672 }
673 s = &slot[slot_num];
674 s->format = format;
675 s->receiver_node = rn;
676 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
677 audio_formats[format], name, slot_num);
678 rn->task = task_register(&(struct task_info) {
679 .name = name,
680 .pre_select = r->pre_select,
681 .post_select = r->post_select,
682 .context = rn,
683 }, &sched);
684 return slot_num;
685 }
686
687 static bool receiver_running(void)
688 {
689 int i;
690 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
691
692 FOR_EACH_SLOT(i) {
693 struct slot_info *s = &slot[i];
694 long unsigned ss2 = s->server_stream_start.tv_sec;
695
696 if (!s->receiver_node)
697 continue;
698 if (task_status(s->receiver_node->task) >= 0)
699 return true;
700 if (ss1 == ss2)
701 return true;
702 }
703 return false;
704 }
705
706 /**
707 * Return the root node of the current buffer tree.
708 *
709 * This is only used for stream grabbing.
710 *
711 * \return \p NULL if no slot is currently active. If more than one buffer tree
712 * exists, the node corresponding to the most recently started receiver is
713 * returned.
714 */
715 struct btr_node *audiod_get_btr_root(void)
716 {
717 int i, newest_slot = -1;
718 struct timeval newest_rstime = {0, 0};
719
720 FOR_EACH_SLOT(i) {
721 struct slot_info *s = &slot[i];
722 struct timeval rstime;
723 if (!s->receiver_node)
724 continue;
725 if (task_status(s->receiver_node->task) < 0)
726 continue;
727 btr_get_node_start(s->receiver_node->btrn, &rstime);
728 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
729 continue;
730 newest_rstime = rstime;
731 newest_slot = i;
732 }
733 if (newest_slot == -1)
734 return NULL;
735 return slot[newest_slot].receiver_node->btrn;
736 }
737
738 /* whether a new instance of a decoder should be started. */
739 static bool must_start_decoder(void)
740 {
741 int cafn = stat_task->current_audio_format_num;
742 unsigned vs = stat_task->vss_status;
743
744 if (audiod_status != AUDIOD_ON)
745 return false;
746 if (cafn < 0)
747 return false;
748 if (!stat_task->ct)
749 return false;
750 if (vs & VSS_STATUS_FLAG_NEXT)
751 return false;
752 if (!(vs & VSS_STATUS_FLAG_PLAYING))
753 return false;
754 if (receiver_running())
755 return false;
756 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
757 return false;
758 return true;
759 }
760
761 static void compute_time_diff(const struct timeval *status_time)
762 {
763 struct timeval tmp, diff;
764 static unsigned count;
765 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
766 const struct timeval max_deviation = {0, 500 * 1000};
767 const int time_smooth = 5;
768
769 sign = tv_diff(status_time, now, &diff);
770 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
771 // sign, sa_time_diff_sign);
772 if (!count) {
773 sa_time_diff_sign = sign;
774 stat_task->sa_time_diff = diff;
775 count++;
776 goto out;
777 }
778 if (count > 5) {
779 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
780 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
781 PARA_WARNING_LOG("time diff jump: %lums\n",
782 s * tv2ms(&tmp));
783 }
784 count++;
785 sa_time_diff_sign = tv_convex_combination(
786 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
787 count > 10? sign : sign * time_smooth, &diff,
788 &tmp);
789 stat_task->sa_time_diff = tmp;
790 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
791 sign < 0? "-" : "+",
792 tv2ms(&diff),
793 sa_time_diff_sign < 0? "-" : "+",
794 tv2ms(&stat_task->sa_time_diff)
795 );
796 out:
797 stat_task->sa_time_diff_sign = sa_time_diff_sign;
798 }
799
800 static int update_item(int itemnum, char *buf)
801 {
802 long unsigned sec, usec;
803
804 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
805 return 1;
806 free(stat_item_values[itemnum]);
807 stat_item_values[itemnum] = para_strdup(buf);
808 stat_client_write_item(itemnum);
809 switch (itemnum) {
810 case SI_STATUS_FLAGS:
811 stat_task->vss_status = 0;
812 if (strchr(buf, 'N'))
813 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
814 if (strchr(buf, 'P'))
815 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
816 break;
817 case SI_OFFSET:
818 stat_task->offset_seconds = atoi(buf);
819 break;
820 case SI_SECONDS_TOTAL:
821 stat_task->length_seconds = atoi(buf);
822 break;
823 case SI_STREAM_START:
824 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
825 stat_task->server_stream_start.tv_sec = sec;
826 stat_task->server_stream_start.tv_usec = usec;
827 }
828 break;
829 case SI_CURRENT_TIME:
830 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
831 struct timeval tv = {sec, usec};
832 compute_time_diff(&tv);
833 }
834 break;
835 case SI_FORMAT:
836 stat_task->current_audio_format_num
837 = get_audio_format_num(buf);
838 }
839 return 1;
840 }
841
842 static int parse_stream_command(const char *txt, const char **cmd)
843 {
844 int ret, len;
845 char *re, *p = strchr(txt, ':');
846
847 if (!p)
848 return -E_MISSING_COLON;
849 *cmd = p + 1;
850 len = p - txt;
851 re = malloc(len + 1);
852 strncpy(re, txt, len);
853 re[len] = '\0';
854 ret = get_matching_audio_format_nums(re);
855 free(re);
856 return ret;
857 }
858
859 static int add_filter(int format, const char *cmdline)
860 {
861 struct audio_format_info *a = &afi[format];
862 int filter_num, nf = a->num_filters;
863 void *cfg;
864 struct lls_parse_result *flpr;
865
866 filter_num = filter_setup(cmdline, &cfg, &flpr);
867 a->filter_lpr = para_realloc(a->filter_lpr,
868 (nf + 1) * sizeof(flpr));
869 a->filter_conf = para_realloc(a->filter_conf,
870 (nf + 1) * sizeof(void *));
871 a->filter_nums = para_realloc(a->filter_nums,
872 (nf + 1) * sizeof(unsigned));
873
874 a->filter_nums[nf] = filter_num;
875 a->filter_conf[nf] = cfg;
876 a->filter_lpr[nf] = flpr;
877 a->num_filters++;
878 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
879 filter_name(filter_num));
880 return filter_num;
881 }
882
883 static int parse_writer_args(void)
884 {
885 int i, ret;
886 const char *cmd;
887 struct audio_format_info *a;
888
889 for (i = 0; i < OPT_GIVEN(WRITER); i++) {
890 int j, nw, af_mask;
891
892 ret = parse_stream_command(lls_string_val(i,
893 OPT_RESULT(WRITER)), &cmd);
894 if (ret < 0)
895 return ret;
896 af_mask = ret;
897 FOR_EACH_AUDIO_FORMAT(j) {
898 a = afi + j;
899 if ((af_mask & (1 << j)) == 0) /* no match */
900 continue;
901 nw = a->num_writers;
902 a->wids = para_realloc(a->wids, (nw + 1) * sizeof(int));
903 a->writer_lpr = para_realloc(a->writer_lpr,
904 (nw + 1) * sizeof(struct lls_parse_result *));
905 a->wids[nw] = check_writer_arg_or_die(cmd,
906 a->writer_lpr + nw);
907 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
908 nw, writer_name(a->wids[nw]));
909 a->num_writers++;
910 }
911 }
912 /* Use default writer for audio formats which are not yet set up. */
913 FOR_EACH_AUDIO_FORMAT(i) {
914 a = afi + i;
915 if (a->num_writers > 0)
916 continue; /* already set up */
917 a->num_writers = 1;
918 a->wids = para_malloc(sizeof(int));
919 a->writer_lpr = para_malloc(sizeof(struct lls_parse_result *));
920 a->wids[0] = check_writer_arg_or_die(NULL, a->writer_lpr);
921 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
922 writer_name(a->wids[0]));
923 }
924 return 1;
925 }
926
927 static int parse_receiver_args(void)
928 {
929 int i, ret;
930 const char *arg;
931 struct audio_format_info *a;
932
933 FOR_EACH_AUDIO_FORMAT(i)
934 afi[i].receiver_num = -1;
935 for (i = OPT_GIVEN(RECEIVER) - 1; i >= 0; i--) {
936 int j, af_mask;
937
938 ret = parse_stream_command(lls_string_val(i,
939 OPT_RESULT(RECEIVER)), &arg);
940 if (ret < 0)
941 goto out;
942 af_mask = ret;
943 FOR_EACH_AUDIO_FORMAT(j) {
944 a = afi + j;
945 if ((af_mask & (1 << j)) == 0) /* no match */
946 continue;
947 /*
948 * If multiple receivers are given for this audio format, the
949 * last one wins and we have to free the previous receiver
950 * config here. Since we are iterating backwards, the winning
951 * receiver arg is in fact the first one given.
952 */
953 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
954 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
955 }
956 }
957 /*
958 * Use the default receiver for those audio formats for which no
959 * receiver was specified.
960 */
961 FOR_EACH_AUDIO_FORMAT(i) {
962 a = afi + i;
963 if (a->receiver_num >= 0)
964 continue;
965 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
966 }
967 FOR_EACH_AUDIO_FORMAT(i) {
968 a = afi + i;
969 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
970 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
971 }
972 ret = 1;
973 out:
974 return ret;
975 }
976
977 static int init_default_filters(void)
978 {
979 int i, ret = 1;
980
981 FOR_EACH_AUDIO_FORMAT(i) {
982 struct audio_format_info *a = &afi[i];
983 const char *name = lls_command_name(RECEIVER_CMD(a));
984 char *tmp;
985 int j;
986
987 if (a->num_filters)
988 continue; /* no default -- nothing to to */
989 /*
990 * udp and dccp streams are fec-encoded, so add fecdec as the
991 * first filter.
992 */
993 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
994 tmp = para_strdup("fecdec");
995 add_filter(i, tmp);
996 free(tmp);
997 if (ret < 0)
998 goto out;
999 }
1000 /* add "dec" to audio format name */
1001 tmp = make_message("%sdec", audio_formats[i]);
1002 for (j = 1; filter_get(j); j++)
1003 if (!strcmp(tmp, filter_name(j)))
1004 break;
1005 free(tmp);
1006 ret = -E_UNSUPPORTED_FILTER;
1007 if (!filter_get(j))
1008 goto out;
1009 tmp = para_strdup(filter_name(j));
1010 ret = add_filter(i, tmp);
1011 free(tmp);
1012 if (ret < 0)
1013 goto out;
1014 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1015 filter_name(j));
1016 }
1017 out:
1018 return ret;
1019 }
1020
1021 static int parse_filter_args(void)
1022 {
1023 int i, j, ret, af_mask, num_matches;
1024
1025 for (i = 0; i < OPT_GIVEN(FILTER); i++) {
1026 const char *arg;
1027 ret = parse_stream_command(lls_string_val(i,
1028 OPT_RESULT(FILTER)), &arg);
1029 if (ret < 0)
1030 goto out;
1031 af_mask = ret;
1032 num_matches = 0;
1033 FOR_EACH_AUDIO_FORMAT(j) {
1034 if ((af_mask & (1 << j)) == 0) /* no match */
1035 continue;
1036 ret = add_filter(j, arg);
1037 if (ret < 0)
1038 goto out;
1039 num_matches++;
1040 }
1041 if (num_matches == 0)
1042 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1043 lls_string_val(i, OPT_RESULT(FILTER)));
1044 }
1045 ret = init_default_filters(); /* use default values for the rest */
1046 out:
1047 return ret;
1048 }
1049
1050 static int parse_stream_args(void)
1051 {
1052 int ret;
1053
1054 ret = parse_receiver_args();
1055 if (ret < 0)
1056 return ret;
1057 ret = parse_filter_args();
1058 if (ret < 0)
1059 return ret;
1060 ret = parse_writer_args();
1061 if (ret < 0)
1062 return ret;
1063 return 1;
1064 }
1065
1066 /* does not unlink socket on errors */
1067 static void init_local_socket(struct command_task *ct)
1068 {
1069 if (OPT_GIVEN(SOCKET))
1070 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
1071 else {
1072 char *hn = para_hostname();
1073 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1074 hn);
1075 free(hn);
1076 }
1077 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1078 if (OPT_GIVEN(FORCE))
1079 unlink(socket_name);
1080 ct->fd = create_local_socket(socket_name);
1081 if (ct->fd >= 0)
1082 return;
1083 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd));
1084 exit(EXIT_FAILURE);
1085 }
1086
1087 static int signal_post_select(struct sched *s, void *context)
1088 {
1089 struct signal_task *st = context;
1090 int ret, signum;
1091
1092 ret = task_get_notification(st->task);
1093 if (ret < 0)
1094 return ret;
1095 signum = para_next_signal(&s->rfds);
1096 switch (signum) {
1097 case SIGINT:
1098 case SIGTERM:
1099 case SIGHUP:
1100 PARA_NOTICE_LOG("received signal %d\n", signum);
1101 task_notify_all(s, E_AUDIOD_SIGNAL);
1102 return -E_AUDIOD_SIGNAL;
1103 }
1104 return 0;
1105 }
1106
1107 static void command_pre_select(struct sched *s, void *context)
1108 {
1109 struct command_task *ct = context;
1110 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1111 }
1112
1113 static int command_post_select(struct sched *s, void *context)
1114 {
1115 int ret;
1116 struct command_task *ct = context;
1117 static struct timeval last_status_dump;
1118 struct timeval tmp, delay;
1119 bool force = false;
1120
1121 ret = task_get_notification(ct->task);
1122 if (ret < 0)
1123 return ret;
1124 ret = handle_connect(ct->fd, &s->rfds);
1125 if (ret < 0) {
1126 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1127 if (ret == -E_AUDIOD_TERM) {
1128 task_notify_all(s, -ret);
1129 return ret;
1130 }
1131 } else if (ret > 0)
1132 force = true;
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_socket(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 close_stat_clients();
1254 free(uid_whitelist);
1255 }
1256
1257 /*
1258 * Check if any receivers/filters/writers need to be started and do so if
1259 * necessary.
1260 */
1261 static void start_stop_decoders(void)
1262 {
1263 int ret;
1264 struct slot_info *sl;
1265
1266 close_unused_slots();
1267 if (audiod_status != AUDIOD_ON ||
1268 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1269 return notify_receivers(E_NOT_PLAYING);
1270 if (!must_start_decoder())
1271 return;
1272 ret = open_receiver(stat_task->current_audio_format_num);
1273 if (ret < 0) {
1274 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1275 return;
1276 }
1277 sl = slot + ret;
1278 open_filters(sl);
1279 open_writers(sl);
1280 activate_grab_clients(&sched);
1281 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1282 audiod_status_dump(true);
1283 }
1284
1285 static void status_pre_select(struct sched *s, void *context)
1286 {
1287 struct status_task *st = context;
1288 int i, ret, cafn = stat_task->current_audio_format_num;
1289
1290 if (must_start_decoder())
1291 goto min_delay;
1292 FOR_EACH_SLOT(i)
1293 if (must_close_slot(i))
1294 goto min_delay;
1295 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1296 if (ret > 0)
1297 goto min_delay;
1298 if (st->ct && audiod_status == AUDIOD_OFF)
1299 goto min_delay;
1300 if (!st->ct && audiod_status != AUDIOD_OFF)
1301 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1302 if (cafn >= 0)
1303 sched_request_barrier(&afi[cafn].restart_barrier, s);
1304 /*
1305 * If para_server is playing we'd like to have a smooth time display
1306 * even if we are running in standby mode. So we request a timeout that
1307 * expires at the next full second.
1308 */
1309 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1310 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1311 return;
1312 min_delay:
1313 sched_min_delay(s);
1314 }
1315
1316 /* restart the client task if necessary */
1317 static int status_post_select(struct sched *s, void *context)
1318 {
1319 struct status_task *st = context;
1320 int ret;
1321
1322 ret = task_get_notification(st->task);
1323 if (ret < 0)
1324 return ret;
1325 if (audiod_status == AUDIOD_OFF) {
1326 if (!st->ct)
1327 goto out;
1328 if (task_status(st->ct->task) >= 0) {
1329 task_notify(st->ct->task, E_AUDIOD_OFF);
1330 goto out;
1331 }
1332 close_stat_pipe();
1333 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1334 goto out;
1335 }
1336 if (st->ct) {
1337 char *buf;
1338 size_t sz;
1339
1340 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1341 if (ret < 0) {
1342 close_stat_pipe();
1343 goto out;
1344 }
1345 if (st->ct->status != CL_EXECUTING)
1346 goto out;
1347 if (ret == 0) {
1348 struct timeval diff;
1349 tv_diff(now, &st->last_status_read, &diff);
1350 if (diff.tv_sec > 61)
1351 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1352 goto out;
1353 }
1354 btr_merge(st->btrn, st->min_iqs);
1355 sz = btr_next_buffer(st->btrn, &buf);
1356 ret = for_each_stat_item(buf, sz, update_item);
1357 if (ret < 0) {
1358 task_notify(st->ct->task, -ret);
1359 goto out;
1360 }
1361 if (sz != ret) {
1362 btr_consume(st->btrn, sz - ret);
1363 st->last_status_read = *now;
1364 st->min_iqs = 0;
1365 } else /* current status item crosses buffers */
1366 st->min_iqs = sz + 1;
1367 goto out;
1368 }
1369 btr_drain(st->btrn);
1370 st->current_audio_format_num = -1;
1371 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1372 goto out;
1373 if (st->clock_diff_count) { /* get status only one time */
1374 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1375 int argc = 5;
1376 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1377 st->clock_diff_count--;
1378 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1379 set_stat_task_restart_barrier(2);
1380
1381 } else {
1382 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1383 int argc = 4;
1384 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1385 set_stat_task_restart_barrier(5);
1386 }
1387 free(stat_item_values[SI_BASENAME]);
1388 stat_item_values[SI_BASENAME] = para_strdup(
1389 "no connection to para_server");
1390 stat_client_write_item(SI_BASENAME);
1391 st->last_status_read = *now;
1392 out:
1393 start_stop_decoders();
1394 return 0;
1395 }
1396
1397 static void init_status_task(struct status_task *st)
1398 {
1399 memset(st, 0, sizeof(struct status_task));
1400 st->sa_time_diff_sign = 1;
1401 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1402 st->current_audio_format_num = -1;
1403 st->btrn = btr_new_node(&(struct btr_node_description)
1404 EMBRACE(.name = "stat"));
1405
1406 stat_task->task = task_register(&(struct task_info) {
1407 .name = "stat",
1408 .pre_select = status_pre_select,
1409 .post_select = status_post_select,
1410 .context = stat_task,
1411 }, &sched);
1412 }
1413
1414 static void set_initial_status(void)
1415 {
1416 audiod_status = AUDIOD_ON;
1417 if (!OPT_GIVEN(MODE))
1418 return;
1419 if (!strcmp(OPT_STRING_VAL(MODE), "sb")) {
1420 audiod_status = AUDIOD_STANDBY;
1421 return;
1422 }
1423 if (!strcmp(OPT_STRING_VAL(MODE), "off")) {
1424 audiod_status = AUDIOD_OFF;
1425 return;
1426 }
1427 if (strcmp(OPT_STRING_VAL(MODE), "on"))
1428 PARA_WARNING_LOG("invalid mode\n");
1429 }
1430
1431 /**
1432 * Lookup the given UID in the whitelist.
1433 *
1434 * The whitelist is the array of arguments to the --user-allow opion. If the
1435 * option was not given, the array is empty, in which case the check succeeds.
1436 *
1437 * \param uid User ID to look up.
1438 *
1439 * \return True if --user-allow was not given, or if uid matches an element of
1440 * the whitelist.
1441 */
1442 bool uid_is_whitelisted(uid_t uid)
1443 {
1444 int i;
1445
1446 if (!OPT_GIVEN(USER_ALLOW))
1447 return true;
1448 for (i = 0; i < OPT_GIVEN(USER_ALLOW); i++)
1449 if (uid == uid_whitelist[i])
1450 return true;
1451 return false;
1452 }
1453
1454 static void handle_help_flags(void)
1455 {
1456 char *help;
1457 bool d = OPT_GIVEN(DETAILED_HELP);
1458
1459 if (d)
1460 help = lls_long_help(CMD_PTR);
1461 else if (OPT_GIVEN(HELP))
1462 help = lls_short_help(CMD_PTR);
1463 else
1464 return;
1465 printf("%s\n", help);
1466 free(help);
1467 print_receiver_helps(d);
1468 print_filter_helps(d);
1469 print_writer_helps(d);
1470 exit(EXIT_SUCCESS);
1471 }
1472
1473 /**
1474 * the main function of para_audiod
1475 *
1476 * \param argc usual argument count
1477 * \param argv usual argument vector
1478 *
1479 * \return EXIT_SUCCESS or EXIT_FAILURE
1480 *
1481 * \sa para_audiod(1)
1482 * */
1483 int main(int argc, char *argv[])
1484 {
1485 int ret, i;
1486 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1487 char *errctx;
1488
1489 valid_fd_012();
1490 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
1491 if (ret < 0)
1492 goto out;
1493 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
1494 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
1495 OPT_STRING_VAL(GROUP));
1496 version_handle_flag("audiod", OPT_GIVEN(VERSION));
1497 handle_help_flags();
1498 parse_config_or_die();
1499 init_random_seed_or_die();
1500 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
1501 recv_init();
1502 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
1503 COLOR_NO, OPT_GIVEN(LOGFILE))) {
1504 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
1505 daemon_set_log_color_or_die(lls_string_val(i,
1506 OPT_RESULT(LOG_COLOR)));
1507 }
1508 daemon_set_flag(DF_LOG_TIME);
1509 daemon_set_flag(DF_LOG_HOSTNAME);
1510 daemon_set_flag(DF_LOG_LL);
1511 if (OPT_GIVEN(LOG_TIMING))
1512 daemon_set_flag(DF_LOG_TIMING);
1513 if (OPT_GIVEN(LOGFILE)) {
1514 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
1515 daemon_open_log_or_die();
1516 }
1517 ret = parse_stream_args();
1518 if (ret < 0) {
1519 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1520 exit(EXIT_FAILURE);
1521 }
1522 daemon_log_welcome("audiod");
1523 daemon_set_start_time();
1524 set_initial_status();
1525 FOR_EACH_SLOT(i)
1526 clear_slot(i);
1527 setup_signal_handling();
1528
1529 init_status_task(stat_task);
1530 init_command_task(cmd_task);
1531
1532 if (OPT_GIVEN(DAEMON))
1533 daemonize(false /* parent exits immediately */);
1534
1535 signal_task->task = task_register(&(struct task_info) {
1536 .name = "signal",
1537 .pre_select = signal_pre_select,
1538 .post_select = signal_post_select,
1539 .context = signal_task,
1540 }, &sched);
1541
1542 sched.default_timeout.tv_sec = 2;
1543 sched.default_timeout.tv_usec = 999 * 1000;
1544 ret = schedule(&sched);
1545 audiod_cleanup();
1546 sched_shutdown(&sched);
1547 signal_shutdown(signal_task);
1548
1549 out:
1550 lls_free_parse_result(lpr, CMD_PTR);
1551 if (errctx)
1552 PARA_ERROR_LOG("%s\n", errctx);
1553 if (ret < 0)
1554 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1555 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1556 }