audiod: Demote severity level of command errors.
[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 #define ENUM_STRING_VAL(_name) (lls_enum_string_val(OPT_UINT32_VAL(_name), \
48 lls_opt(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, CMD_PTR)))
49
50 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
51 /** define the array containing all supported audio formats */
52 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
53
54 /** Defines how audiod handles one supported audio format. */
55 struct audio_format_info {
56 /** the receiver for this audio format */
57 int receiver_num;
58 /** Parsed receiver command line. */
59 struct lls_parse_result *receiver_lpr;
60 /** the number of filters that should be activated for this audio format */
61 unsigned int num_filters;
62 /** Array of filter numbers to be activated. */
63 unsigned *filter_nums;
64 /** Pointer to the array of filter configurations. */
65 void **filter_conf;
66 /** Parsed filter command line, one parse result per filter. */
67 struct lls_parse_result **filter_lpr;
68 /** the number of filters that should be activated for this audio format */
69 unsigned int num_writers;
70 /** Array of writer IDs to be activated. */
71 int *wids;
72 /** Parsed writer command line(s) */
73 struct lls_parse_result **writer_lpr;
74 /** do not start receiver/filters/writer before this time */
75 struct timeval restart_barrier;
76 };
77
78 /* Describes one instance of a receiver-filter-writer chain. */
79 struct slot_info {
80 /* Number of the audio format in this slot. */
81 int format;
82 /* The stream_start status item announced by para_server. */
83 struct timeval server_stream_start;
84 /* The offset status item announced by para_server. */
85 unsigned offset_seconds;
86 /* The seconds_total status item announced by para_server. */
87 unsigned seconds_total;
88 /* The receiver info associated with this slot. */
89 struct receiver_node *receiver_node;
90 /* The array of filter nodes. */
91 struct filter_node *fns;
92 /* The array of writers attached to the last filter. */
93 struct writer_node *wns;
94 };
95
96 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
97 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
98
99 /** Maximal number of simultaneous instances. */
100 #define MAX_STREAM_SLOTS 5
101
102 /** Iterate over all slots. */
103 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
104
105 /**
106 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
107 * be associated with a receiver/filter/writer triple. This array holds all
108 * information on the status of these slots.
109 */
110 struct slot_info slot[MAX_STREAM_SLOTS];
111
112 /** The vss status flags audiod is interested in. */
113 enum vss_status_flags {
114 /** Whether the 'N' flag is set. */
115 VSS_STATUS_FLAG_NEXT = 1,
116 /** The 'P' flag is set. */
117 VSS_STATUS_FLAG_PLAYING = 2,
118 };
119
120 /**
121 * The scheduler instance of para_audiod.
122 *
123 * This is needed also in audiod_command.c (for the tasks command), so it can
124 * not be made static.
125 */
126 struct sched sched = {.max_fileno = 0};
127
128 /* The task for obtaining para_server's status (para_client stat). */
129 struct status_task {
130 /** The associated task structure of audiod. */
131 struct task *task;
132 /** Client data associated with the stat task. */
133 struct client_task *ct;
134 /** Do not restart client command until this time. */
135 struct timeval restart_barrier;
136 /** Last time we received status data from para_server. */
137 struct timeval last_status_read;
138 size_t min_iqs;
139 /** The offset value announced by para_server. */
140 int offset_seconds;
141 /** The length of the current audio file as announced by para_server. */
142 int length_seconds;
143 /** The start of the current stream from the view of para_server. */
144 struct timeval server_stream_start;
145 /** The average time deviation between para_server and para_audiod. */
146 struct timeval sa_time_diff;
147 /** Whether client time is ahead of server time. */
148 int sa_time_diff_sign;
149 /** The 'P' and the 'N' flags as announced by para_server. */
150 enum vss_status_flags vss_status;
151 /** Number of times the clock difference is to be checked. */
152 unsigned clock_diff_count;
153 /** When to start the next check for clock difference. */
154 struct timeval clock_diff_barrier;
155 /** Number of the audio format as announced by para_server. */
156 int current_audio_format_num;
157 /* The status task btrn is the child of the client task. */
158 struct btr_node *btrn;
159 };
160
161 /** The array of status items sent by para_server. */
162 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
163
164 /**
165 * The current mode of operation (AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY).
166 * Set by the on/off/cycle commands.
167 */
168 int audiod_status = AUDIOD_ON;
169
170 static char *socket_name;
171 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
172 static struct signal_task *signal_task;
173 static struct status_task status_task_struct;
174 static uid_t *uid_whitelist;
175
176 /**
177 * The task that calls the status command of para_server.
178 *
179 * \sa \ref struct status_task.
180 */
181 static struct status_task *stat_task = &status_task_struct;
182
183 struct command_task {
184 /** The local listening socket. */
185 int fd;
186 /** The associated task structure. */
187 struct task *task;
188 };
189
190 /** Iterate over all supported audio formats. */
191 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
192
193 /**
194 * Get the audio format number.
195 *
196 * \param name The name of the audio format.
197 *
198 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
199 * \a name is not a supported audio format.
200 */
201 static int get_audio_format_num(const char *name)
202 {
203 int i;
204
205 while (para_isspace(*name))
206 name++;
207 FOR_EACH_AUDIO_FORMAT(i)
208 if (!strcmp(name, audio_formats[i]))
209 return i;
210 return -E_UNSUPPORTED_AUDIO_FORMAT;
211 }
212
213 /**
214 * Return the flags for the \a decoder_flags status item.
215 *
216 * Allocates a string which contains one octal digit per slot. Bit zero (value
217 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
218 * have the analogous meaning for filter and writer, respectively.
219 *
220 * \return String that must be freed by the caller.
221 */
222 __malloc char *audiod_get_decoder_flags(void)
223 {
224 int i;
225 char flags[MAX_STREAM_SLOTS + 1];
226
227 FOR_EACH_SLOT(i) {
228 struct slot_info *s = &slot[i];
229 char flag = '0';
230 if (s->receiver_node)
231 flag += 1;
232 if (s->fns)
233 flag += 2;
234 if (s->wns)
235 flag += 4;
236 flags[i] = flag;
237 }
238 flags[MAX_STREAM_SLOTS] = '\0';
239 return para_strdup(flags);
240 }
241
242 static int get_matching_audio_format_nums(const char *re)
243 {
244 int i, ret;
245 regex_t preg;
246
247 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
248 if (ret < 0)
249 return ret;
250 ret = 0;
251 FOR_EACH_AUDIO_FORMAT(i)
252 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
253 ret |= (1 << i);
254 regfree(&preg);
255 return ret;
256 }
257
258 static int get_play_time_slot_num(void)
259 {
260 int i, oldest_slot = -1;
261 struct timeval oldest_wstime = {0, 0};
262
263 FOR_EACH_SLOT(i) {
264 struct slot_info *s = &slot[i];
265 struct timeval wstime;
266 if (!s->wns || !s->wns[0].btrn)
267 continue;
268 btr_get_node_start(s->wns[0].btrn, &wstime);
269 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
270 continue;
271 oldest_wstime = wstime;
272 oldest_slot = i;
273 }
274 return oldest_slot;
275 }
276
277 /**
278 * Compute the play time based on information of the current slot.
279 *
280 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
281 * from the status items received from para_server and the start time of the
282 * (first) writer of the current slot.
283 *
284 * It has to take into account that the stream was probably not started at
285 * the beginning of the file, that the clock between the server and the client
286 * host may differ and that playback of the stream was delayed, e.g. because
287 * the prebuffer filter is used in the filter configuration.
288 *
289 * If no writer is active, for example because para_audiod runs in standby
290 * mode, an approximation based only on the status items is computed and the
291 * returned string is prefixed with "~".
292 *
293 * \return A string that must be freed by the caller.
294 */
295 char *get_time_string(void)
296 {
297 int ret, seconds = 0, length = stat_task->length_seconds;
298 struct timeval *tmp, sum, sss, /* server stream start */
299 rstime, /* receiver start time */
300 wstime, /* writer start time */
301 wtime, /* now - writer start */
302 rskip; /* receiver start - sss */
303 int slot_num = get_play_time_slot_num();
304 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
305 bool writer_active = s && s->wns && s->wns[0].btrn;
306 char *msg;
307
308 if (audiod_status == AUDIOD_OFF)
309 goto empty;
310 if (stat_task->server_stream_start.tv_sec == 0) {
311 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
312 goto out; /* server is about to change file */
313 if (length > 0) /* paused */
314 return NULL;
315 goto empty; /* stopped */
316 }
317 /*
318 * Valid status items and playing, set length and tmp to the stream
319 * start. We use the writer start time from the slot info and fall back
320 * to the info from current status items if no writer is active yet.
321 */
322 tmp = &stat_task->server_stream_start;
323 if (writer_active) {
324 btr_get_node_start(s->wns[0].btrn, &wstime);
325 if (wstime.tv_sec != 0) { /* writer wrote something */
326 if (s->server_stream_start.tv_sec == 0) {
327 /* copy status info to slot */
328 s->server_stream_start = stat_task->server_stream_start;
329 s->offset_seconds = stat_task->offset_seconds;
330 s->seconds_total = stat_task->length_seconds;
331 }
332 length = s->seconds_total;
333 tmp = &s->server_stream_start;
334 }
335 }
336 if (stat_task->sa_time_diff_sign > 0)
337 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
338 else
339 tv_add(tmp, &stat_task->sa_time_diff, &sss);
340 if (!writer_active) {
341 struct timeval diff;
342 tv_diff(now, &sss, &diff);
343 seconds = diff.tv_sec + stat_task->offset_seconds;
344 goto out;
345 }
346 tv_diff(now, &wstime, &wtime);
347 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
348 seconds = s->offset_seconds;
349 if (s->receiver_node->btrn) {
350 btr_get_node_start(s->receiver_node->btrn, &rstime);
351 ret = tv_diff(&rstime, &sss, &rskip);
352 if (ret > 0 && rskip.tv_sec > 2) {
353 /* audiod was started in the middle of the stream */
354 tv_add(&wtime, &rskip, &sum);
355 seconds += sum.tv_sec;
356 } else
357 seconds += wtime.tv_sec;
358 } else
359 seconds += wtime.tv_sec;
360 out:
361 seconds = PARA_MIN(seconds, length);
362 seconds = PARA_MAX(seconds, 0);
363 msg = make_message(
364 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
365 s? "" : "~",
366 seconds / 60,
367 seconds % 60,
368 (length - seconds) / 60,
369 (length - seconds) % 60,
370 length? (seconds * 100 + length / 2) / length : 0,
371 length / 60,
372 length % 60
373 );
374 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
375 return msg;
376 empty:
377 return para_strdup(NULL);
378 }
379
380 static void parse_config_or_die(void)
381 {
382 int i, ret;
383 uint32_t n;
384
385 ret = lsu_merge_config_file_options(OPT_STRING_VAL(CONFIG_FILE),
386 "audiod.conf", &lpr, CMD_PTR, audiod_suite, 0U /* flags */);
387 if (ret < 0) {
388 PARA_EMERG_LOG("failed to parse config file: %s\n",
389 para_strerror(-ret));
390 exit(EXIT_FAILURE);
391 }
392 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
393 n = OPT_GIVEN(USER_ALLOW);
394 if (n == 0)
395 return;
396 uid_whitelist = para_malloc(n * sizeof(uid_t));
397 for (i = 0; i < n; i++) {
398 const char *arg = lls_string_val(i, OPT_RESULT(USER_ALLOW));
399 int32_t val;
400 struct passwd *pw;
401 ret = para_atoi32(arg, &val);
402 if (ret >= 0) {
403 uid_whitelist[i] = val;
404 continue;
405 }
406 pw = getpwnam(arg);
407 if (!pw) {
408 PARA_EMERG_LOG("invalid username: %s\n", arg);
409 exit(EXIT_FAILURE);
410 }
411 uid_whitelist[i] = pw->pw_uid;
412 }
413 }
414
415 static void setup_signal_handling(void)
416 {
417 signal_task = signal_init_or_die();
418 para_install_sighandler(SIGINT);
419 para_install_sighandler(SIGTERM);
420 para_install_sighandler(SIGHUP);
421 para_sigaction(SIGPIPE, SIG_IGN);
422 }
423
424 static void clear_slot(int slot_num)
425 {
426 struct slot_info *s = &slot[slot_num];
427
428 PARA_INFO_LOG("clearing slot %d\n", slot_num);
429 memset(s, 0, sizeof(struct slot_info));
430 s->format = -1;
431 }
432
433 static void close_receiver(int slot_num)
434 {
435 struct slot_info *s = &slot[slot_num];
436 struct audio_format_info *a;
437
438 if (s->format < 0 || !s->receiver_node)
439 return;
440 a = &afi[s->format];
441 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
442 audio_formats[s->format], slot_num);
443 RECEIVER(a)->close(s->receiver_node);
444 btr_remove_node(&s->receiver_node->btrn);
445 task_reap(&s->receiver_node->task);
446 free(s->receiver_node);
447 s->receiver_node = NULL;
448 if (audiod_status == AUDIOD_ON)
449 stat_task->current_audio_format_num = -1;
450 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
451 &a->restart_barrier);
452 }
453
454 static void writer_cleanup(struct writer_node *wn)
455 {
456 if (!wn)
457 return;
458 PARA_INFO_LOG("closing %s\n", writer_name(wn->wid));
459 writer_get(wn->wid)->close(wn);
460 btr_remove_node(&wn->btrn);
461 task_reap(&wn->task);
462 }
463
464 static void close_writers(struct slot_info *s)
465 {
466 struct audio_format_info *a;
467 int i;
468
469 if (s->format < 0)
470 return;
471 assert(s->wns);
472 a = afi + s->format;
473 if (a->num_writers == 0)
474 writer_cleanup(s->wns);
475 else {
476 for (i = 0; i < a->num_writers; i++)
477 writer_cleanup(s->wns + i);
478 }
479 free(s->wns);
480 s->wns = NULL;
481 }
482
483 static void notify_writers(int error)
484 {
485 int i;
486
487 FOR_EACH_SLOT(i) {
488 struct slot_info *s = slot + i;
489 struct audio_format_info *a;
490 int j;
491
492 if (s->format < 0)
493 continue;
494 a = afi + s->format;
495 for (j = 0; j < a->num_writers; j++)
496 task_notify(s->wns[j].task, error);
497 }
498 }
499
500 static void close_filters(struct slot_info *s)
501 {
502 int i;
503 struct audio_format_info *a = afi + s->format;
504 if (a->num_filters == 0)
505 return;
506 for (i = a->num_filters - 1; i >= 0; i--) {
507 struct filter_node *fn = s->fns + i;
508 const struct filter *f;
509
510 if (!fn)
511 continue;
512 f = filter_get(fn->filter_num);
513 if (f->close)
514 f->close(fn);
515 btr_remove_node(&fn->btrn);
516 task_reap(&fn->task);
517 }
518 free(s->fns);
519 s->fns = NULL;
520 }
521
522 static void notify_receivers(int error)
523 {
524 int i;
525
526 FOR_EACH_SLOT(i) {
527 struct slot_info *s = slot + i;
528 if (s->format < 0)
529 continue;
530 if (!s->receiver_node)
531 continue;
532 task_notify(s->receiver_node->task, error);
533 }
534 }
535
536 static int get_empty_slot(void)
537 {
538 int i;
539 struct slot_info *s;
540
541 FOR_EACH_SLOT(i) {
542 s = &slot[i];
543 if (s->format < 0) {
544 clear_slot(i);
545 return i;
546 }
547 if (s->wns || s->receiver_node || s->fns)
548 continue;
549 clear_slot(i);
550 return i;
551 }
552 return -E_NO_MORE_SLOTS;
553 }
554
555 static void open_filters(struct slot_info *s)
556 {
557 struct audio_format_info *a = afi + s->format;
558 struct filter_node *fn;
559 int nf = a->num_filters;
560 struct btr_node *parent;
561 int i;
562
563 if (nf == 0)
564 return;
565 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
566 assert(s->fns == NULL);
567 s->fns = para_calloc(nf * sizeof(struct filter_node));
568 parent = s->receiver_node->btrn;
569 for (i = 0; i < nf; i++) {
570 char buf[20];
571 const char *name;
572 const struct filter *f = filter_get(a->filter_nums[i]);
573 fn = s->fns + i;
574 fn->filter_num = a->filter_nums[i];
575 fn->conf = a->filter_conf[i];
576 fn->lpr = a->filter_lpr[i];
577 name = filter_name(fn->filter_num);
578 fn->btrn = btr_new_node(&(struct btr_node_description)
579 EMBRACE(.name = name, .parent = parent,
580 .handler = f->execute, .context = fn));
581
582 if (f->open)
583 f->open(fn);
584 sprintf(buf, "%s (slot %d)", name, (int)(s - slot));
585 fn->task = task_register(&(struct task_info) {
586 .name = buf,
587 .pre_select = f->pre_select,
588 .post_select = f->post_select,
589 .context = fn,
590 }, &sched);
591 parent = fn->btrn;
592 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
593 audio_formats[s->format], i, nf, name, (int)(s - slot));
594 }
595 }
596
597 static void open_writers(struct slot_info *s)
598 {
599 int i;
600 struct audio_format_info *a = afi + s->format;
601 struct writer_node *wn;
602 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
603
604 assert(s->wns == NULL);
605 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
606 * sizeof(struct writer_node));
607 for (i = 0; i < a->num_writers; i++) {
608 wn = s->wns + i;
609 wn->wid = a->wids[i];
610 wn->lpr = a->writer_lpr[i];
611 register_writer_node(wn, parent, &sched);
612 PARA_NOTICE_LOG("%s writer started in slot %d\n",
613 writer_name(a->wids[i]), (int)(s - slot));
614 }
615 }
616
617 /* returns slot num on success */
618 static int open_receiver(int format)
619 {
620 struct audio_format_info *a = &afi[format];
621 struct slot_info *s;
622 int ret, slot_num;
623 const struct receiver *r = RECEIVER(a);
624 const char *name = lls_command_name(RECEIVER_CMD(a));
625 struct receiver_node *rn;
626
627 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
628 ret = get_empty_slot();
629 if (ret < 0)
630 return ret;
631 slot_num = ret;
632 rn = para_calloc(sizeof(*rn));
633 rn->receiver = r;
634 rn->lpr = a->receiver_lpr;
635 rn->btrn = btr_new_node(&(struct btr_node_description)
636 EMBRACE(.name = name, .context = rn));
637 ret = r->open(rn);
638 if (ret < 0) {
639 PARA_ERROR_LOG("could not open %s receiver\n", name);
640 btr_remove_node(&rn->btrn);
641 free(rn);
642 return ret;
643 }
644 s = &slot[slot_num];
645 s->format = format;
646 s->receiver_node = rn;
647 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
648 audio_formats[format], name, slot_num);
649 rn->task = task_register(&(struct task_info) {
650 .name = name,
651 .pre_select = r->pre_select,
652 .post_select = r->post_select,
653 .context = rn,
654 }, &sched);
655 return slot_num;
656 }
657
658 static bool receiver_running(void)
659 {
660 int i;
661 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
662
663 FOR_EACH_SLOT(i) {
664 struct slot_info *s = &slot[i];
665 long unsigned ss2 = s->server_stream_start.tv_sec;
666
667 if (!s->receiver_node)
668 continue;
669 if (task_status(s->receiver_node->task) >= 0)
670 return true;
671 if (ss1 == ss2)
672 return true;
673 }
674 return false;
675 }
676
677 /**
678 * Return the root node of the current buffer tree.
679 *
680 * This is only used for stream grabbing.
681 *
682 * \return \p NULL if no slot is currently active. If more than one buffer tree
683 * exists, the node corresponding to the most recently started receiver is
684 * returned.
685 */
686 struct btr_node *audiod_get_btr_root(void)
687 {
688 int i, newest_slot = -1;
689 struct timeval newest_rstime = {0, 0};
690
691 FOR_EACH_SLOT(i) {
692 struct slot_info *s = &slot[i];
693 struct timeval rstime;
694 if (!s->receiver_node)
695 continue;
696 if (task_status(s->receiver_node->task) < 0)
697 continue;
698 btr_get_node_start(s->receiver_node->btrn, &rstime);
699 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
700 continue;
701 newest_rstime = rstime;
702 newest_slot = i;
703 }
704 if (newest_slot == -1)
705 return NULL;
706 return slot[newest_slot].receiver_node->btrn;
707 }
708
709 /* whether a new instance of a decoder should be started. */
710 static bool must_start_decoder(void)
711 {
712 int cafn = stat_task->current_audio_format_num;
713 unsigned vs = stat_task->vss_status;
714
715 if (audiod_status != AUDIOD_ON)
716 return false;
717 if (cafn < 0)
718 return false;
719 if (!stat_task->ct)
720 return false;
721 if (vs & VSS_STATUS_FLAG_NEXT)
722 return false;
723 if (!(vs & VSS_STATUS_FLAG_PLAYING))
724 return false;
725 if (receiver_running())
726 return false;
727 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
728 return false;
729 return true;
730 }
731
732 static void compute_time_diff(const struct timeval *status_time)
733 {
734 struct timeval tmp, diff;
735 static unsigned count;
736 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
737 const struct timeval max_deviation = {0, 500 * 1000};
738 const int time_smooth = 5;
739
740 sign = tv_diff(status_time, now, &diff);
741 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
742 // sign, sa_time_diff_sign);
743 if (!count) {
744 sa_time_diff_sign = sign;
745 stat_task->sa_time_diff = diff;
746 count++;
747 goto out;
748 }
749 if (count > 5) {
750 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
751 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
752 PARA_WARNING_LOG("time diff jump: %c%lums\n",
753 s < 0? '-' : '+', tv2ms(&tmp));
754 }
755 count++;
756 sa_time_diff_sign = tv_convex_combination(
757 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
758 count > 10? sign : sign * time_smooth, &diff,
759 &tmp);
760 stat_task->sa_time_diff = tmp;
761 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
762 sign < 0? "-" : "+",
763 tv2ms(&diff),
764 sa_time_diff_sign < 0? "-" : "+",
765 tv2ms(&stat_task->sa_time_diff)
766 );
767 out:
768 stat_task->sa_time_diff_sign = sa_time_diff_sign;
769 }
770
771 static int update_item(int itemnum, char *buf)
772 {
773 long unsigned sec, usec;
774
775 if (stat_task->clock_diff_count && itemnum != SI_current_time)
776 return 1;
777 free(stat_item_values[itemnum]);
778 stat_item_values[itemnum] = para_strdup(buf);
779 stat_client_write_item(itemnum);
780 switch (itemnum) {
781 case SI_status_flags:
782 stat_task->vss_status = 0;
783 if (strchr(buf, 'N'))
784 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
785 if (strchr(buf, 'P'))
786 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
787 break;
788 case SI_offset:
789 stat_task->offset_seconds = atoi(buf);
790 break;
791 case SI_seconds_total:
792 stat_task->length_seconds = atoi(buf);
793 break;
794 case SI_stream_start:
795 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
796 stat_task->server_stream_start.tv_sec = sec;
797 stat_task->server_stream_start.tv_usec = usec;
798 }
799 break;
800 case SI_current_time:
801 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
802 struct timeval tv = {sec, usec};
803 compute_time_diff(&tv);
804 }
805 break;
806 case SI_format:
807 stat_task->current_audio_format_num
808 = get_audio_format_num(buf);
809 }
810 return 1;
811 }
812
813 static int parse_stream_command(const char *txt, const char **cmd)
814 {
815 int ret, len;
816 char *re, *p = strchr(txt, ':');
817
818 if (!p)
819 return -E_MISSING_COLON;
820 *cmd = p + 1;
821 len = p - txt;
822 re = para_malloc(len + 1);
823 strncpy(re, txt, len);
824 re[len] = '\0';
825 ret = get_matching_audio_format_nums(re);
826 free(re);
827 return ret;
828 }
829
830 static int add_filter(int format, const char *cmdline)
831 {
832 struct audio_format_info *a = &afi[format];
833 int filter_num, nf = a->num_filters;
834 void *cfg;
835 struct lls_parse_result *flpr;
836
837 filter_num = filter_setup(cmdline, &cfg, &flpr);
838 a->filter_lpr = para_realloc(a->filter_lpr,
839 (nf + 1) * sizeof(flpr));
840 a->filter_conf = para_realloc(a->filter_conf,
841 (nf + 1) * sizeof(void *));
842 a->filter_nums = para_realloc(a->filter_nums,
843 (nf + 1) * sizeof(unsigned));
844
845 a->filter_nums[nf] = filter_num;
846 a->filter_conf[nf] = cfg;
847 a->filter_lpr[nf] = flpr;
848 a->num_filters++;
849 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
850 filter_name(filter_num));
851 return filter_num;
852 }
853
854 static int parse_writer_args(void)
855 {
856 int i, ret;
857 const char *cmd;
858 struct audio_format_info *a;
859
860 for (i = 0; i < OPT_GIVEN(WRITER); i++) {
861 int j, nw, af_mask;
862
863 ret = parse_stream_command(lls_string_val(i,
864 OPT_RESULT(WRITER)), &cmd);
865 if (ret < 0)
866 return ret;
867 af_mask = ret;
868 FOR_EACH_AUDIO_FORMAT(j) {
869 a = afi + j;
870 if ((af_mask & (1 << j)) == 0) /* no match */
871 continue;
872 nw = a->num_writers;
873 a->wids = para_realloc(a->wids, (nw + 1) * sizeof(int));
874 a->writer_lpr = para_realloc(a->writer_lpr,
875 (nw + 1) * sizeof(struct lls_parse_result *));
876 a->wids[nw] = check_writer_arg_or_die(cmd,
877 a->writer_lpr + nw);
878 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
879 nw, writer_name(a->wids[nw]));
880 a->num_writers++;
881 }
882 }
883 /* Use default writer for audio formats which are not yet set up. */
884 FOR_EACH_AUDIO_FORMAT(i) {
885 a = afi + i;
886 if (a->num_writers > 0)
887 continue; /* already set up */
888 a->num_writers = 1;
889 a->wids = para_malloc(sizeof(int));
890 a->writer_lpr = para_malloc(sizeof(struct lls_parse_result *));
891 a->wids[0] = check_writer_arg_or_die(NULL, a->writer_lpr);
892 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
893 writer_name(a->wids[0]));
894 }
895 return 1;
896 }
897
898 static int parse_receiver_args(void)
899 {
900 int i, ret;
901 const char *arg;
902 struct audio_format_info *a;
903
904 FOR_EACH_AUDIO_FORMAT(i)
905 afi[i].receiver_num = -1;
906 for (i = OPT_GIVEN(RECEIVER) - 1; i >= 0; i--) {
907 int j, af_mask;
908
909 ret = parse_stream_command(lls_string_val(i,
910 OPT_RESULT(RECEIVER)), &arg);
911 if (ret < 0)
912 goto out;
913 af_mask = ret;
914 FOR_EACH_AUDIO_FORMAT(j) {
915 a = afi + j;
916 if ((af_mask & (1 << j)) == 0) /* no match */
917 continue;
918 /*
919 * If multiple receivers are given for this audio format, the
920 * last one wins and we have to free the previous receiver
921 * config here. Since we are iterating backwards, the winning
922 * receiver arg is in fact the first one given.
923 */
924 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
925 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
926 }
927 }
928 /*
929 * Use the default receiver for those audio formats for which no
930 * receiver was specified.
931 */
932 FOR_EACH_AUDIO_FORMAT(i) {
933 a = afi + i;
934 if (a->receiver_num >= 0)
935 continue;
936 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
937 }
938 FOR_EACH_AUDIO_FORMAT(i) {
939 a = afi + i;
940 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
941 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
942 }
943 ret = 1;
944 out:
945 return ret;
946 }
947
948 static int init_default_filters(void)
949 {
950 int i, ret = 1;
951
952 FOR_EACH_AUDIO_FORMAT(i) {
953 struct audio_format_info *a = &afi[i];
954 const char *name = lls_command_name(RECEIVER_CMD(a));
955 char *tmp;
956 int j;
957
958 if (a->num_filters)
959 continue; /* no default -- nothing to to */
960 /*
961 * udp and dccp streams are fec-encoded, so add fecdec as the
962 * first filter.
963 */
964 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
965 tmp = para_strdup("fecdec");
966 add_filter(i, tmp);
967 free(tmp);
968 if (ret < 0)
969 goto out;
970 }
971 /* add "dec" to audio format name */
972 tmp = make_message("%sdec", audio_formats[i]);
973 for (j = 1; filter_get(j); j++)
974 if (!strcmp(tmp, filter_name(j)))
975 break;
976 free(tmp);
977 ret = -E_UNSUPPORTED_FILTER;
978 if (!filter_get(j))
979 goto out;
980 tmp = para_strdup(filter_name(j));
981 ret = add_filter(i, tmp);
982 free(tmp);
983 if (ret < 0)
984 goto out;
985 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
986 filter_name(j));
987 }
988 out:
989 return ret;
990 }
991
992 static int parse_filter_args(void)
993 {
994 int i, j, ret, af_mask, num_matches;
995
996 for (i = 0; i < OPT_GIVEN(FILTER); i++) {
997 const char *arg;
998 ret = parse_stream_command(lls_string_val(i,
999 OPT_RESULT(FILTER)), &arg);
1000 if (ret < 0)
1001 goto out;
1002 af_mask = ret;
1003 num_matches = 0;
1004 FOR_EACH_AUDIO_FORMAT(j) {
1005 if ((af_mask & (1 << j)) == 0) /* no match */
1006 continue;
1007 ret = add_filter(j, arg);
1008 if (ret < 0)
1009 goto out;
1010 num_matches++;
1011 }
1012 if (num_matches == 0)
1013 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1014 lls_string_val(i, OPT_RESULT(FILTER)));
1015 }
1016 ret = init_default_filters(); /* use default values for the rest */
1017 out:
1018 return ret;
1019 }
1020
1021 static int parse_stream_args(void)
1022 {
1023 int ret;
1024
1025 ret = parse_receiver_args();
1026 if (ret < 0)
1027 return ret;
1028 ret = parse_filter_args();
1029 if (ret < 0)
1030 return ret;
1031 ret = parse_writer_args();
1032 if (ret < 0)
1033 return ret;
1034 return 1;
1035 }
1036
1037 /* does not unlink socket on errors */
1038 static void init_local_socket(struct command_task *ct)
1039 {
1040 if (OPT_GIVEN(SOCKET))
1041 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
1042 else {
1043 char *hn = para_hostname();
1044 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1045 hn);
1046 free(hn);
1047 }
1048 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1049 if (OPT_GIVEN(FORCE))
1050 unlink(socket_name);
1051 ct->fd = create_local_socket(socket_name);
1052 if (ct->fd >= 0)
1053 return;
1054 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd));
1055 exit(EXIT_FAILURE);
1056 }
1057
1058 static int signal_post_select(struct sched *s, void *context)
1059 {
1060 struct signal_task *st = context;
1061 int ret, signum;
1062
1063 ret = task_get_notification(st->task);
1064 if (ret < 0)
1065 return ret;
1066 signum = para_next_signal(&s->rfds);
1067 switch (signum) {
1068 case SIGINT:
1069 case SIGTERM:
1070 case SIGHUP:
1071 PARA_WARNING_LOG("terminating on signal %d\n", signum);
1072 task_notify_all(s, E_AUDIOD_SIGNAL);
1073 return -E_AUDIOD_SIGNAL;
1074 }
1075 return 0;
1076 }
1077
1078 static void command_pre_select(struct sched *s, void *context)
1079 {
1080 struct command_task *ct = context;
1081 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1082 }
1083
1084 static int command_post_select(struct sched *s, void *context)
1085 {
1086 int ret;
1087 struct command_task *ct = context;
1088 static struct timeval last_status_dump;
1089 struct timeval tmp, delay;
1090 bool force = false;
1091
1092 ret = task_get_notification(ct->task);
1093 if (ret < 0)
1094 return ret;
1095 ret = handle_connect(ct->fd, &s->rfds);
1096 if (ret < 0) {
1097 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1098 if (ret == -E_AUDIOD_TERM) {
1099 task_notify_all(s, -ret);
1100 return ret;
1101 }
1102 } else if (ret > 0)
1103 force = true;
1104 if (force == true)
1105 goto dump;
1106
1107 /* if last status dump was less than 500ms ago, do nothing */
1108 delay.tv_sec = 0;
1109 delay.tv_usec = 500 * 1000;
1110 tv_add(&last_status_dump, &delay, &tmp);
1111 if (tv_diff(now, &tmp, NULL) < 0)
1112 return 0;
1113
1114 /*
1115 * If last status dump was more than 5s ago, force update. Otherwise,
1116 * update only those items that have changed.
1117 */
1118 delay.tv_sec = 5;
1119 delay.tv_usec = 0;
1120 tv_add(&last_status_dump, &delay, &tmp);
1121 if (tv_diff(now, &tmp, NULL) > 0)
1122 force = true;
1123 dump:
1124 audiod_status_dump(force);
1125 last_status_dump = *now;
1126 return 1;
1127 }
1128
1129 static void init_command_task(struct command_task *ct)
1130 {
1131 init_local_socket(ct); /* doesn't return on errors */
1132
1133 ct->task = task_register(&(struct task_info) {
1134 .name = "command",
1135 .pre_select = command_pre_select,
1136 .post_select = command_post_select,
1137 .context = ct,
1138 }, &sched);
1139 }
1140
1141 static void close_stat_pipe(void)
1142 {
1143 if (!stat_task->ct)
1144 return;
1145 task_reap(&stat_task->ct->task);
1146 client_close(stat_task->ct);
1147 stat_task->ct = NULL;
1148 clear_and_dump_items();
1149 stat_task->length_seconds = 0;
1150 stat_task->offset_seconds = 0;
1151 stat_task->vss_status = 0;
1152 stat_task->current_audio_format_num = -1;
1153 audiod_status_dump(true);
1154 }
1155
1156 /* avoid busy loop if server is down */
1157 static void set_stat_task_restart_barrier(unsigned seconds)
1158 {
1159 struct timeval delay = {seconds, 0};
1160 tv_add(now, &delay, &stat_task->restart_barrier);
1161 }
1162
1163 static bool must_close_slot(int slot_num)
1164 {
1165 struct slot_info *s = &slot[slot_num];
1166 struct audio_format_info *a = afi + s->format;
1167 int i;
1168
1169 if (s->format < 0)
1170 return false;
1171 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1172 return false;
1173 for (i = 0; i < a->num_filters; i++)
1174 if (s->fns && task_status(s->fns[i].task) >= 0)
1175 return false;
1176 if (a->num_writers > 0) {
1177 for (i = 0; i < a->num_writers; i++)
1178 if (s->wns && task_status(s->wns[i].task) >= 0)
1179 return false;
1180 } else {
1181 if (s->wns && task_status(s->wns[0].task) >= 0)
1182 return false;
1183 }
1184 return true;
1185 }
1186
1187 static void close_slot(int slot_num)
1188 {
1189 struct slot_info *s = slot + slot_num;
1190
1191 PARA_INFO_LOG("closing slot %d\n", slot_num);
1192 close_writers(s);
1193 close_filters(s);
1194 close_receiver(slot_num);
1195 clear_slot(slot_num);
1196 }
1197
1198 static void close_unused_slots(void)
1199 {
1200 int i;
1201 bool dump = false;
1202
1203 FOR_EACH_SLOT(i)
1204 if (must_close_slot(i)) {
1205 close_slot(i);
1206 dump = true;
1207 }
1208 if (dump)
1209 audiod_status_dump(true);
1210 }
1211
1212 /*
1213 * Cleanup all resources.
1214 *
1215 * This performs various cleanups, removes the audiod socket and closes the
1216 * connection to para_server.
1217 */
1218 static void audiod_cleanup(void)
1219 {
1220 if (socket_name)
1221 unlink(socket_name);
1222 close_stat_pipe();
1223 close_unused_slots();
1224 close_stat_clients();
1225 free(uid_whitelist);
1226 }
1227
1228 /*
1229 * Check if any receivers/filters/writers need to be started and do so if
1230 * necessary.
1231 */
1232 static void start_stop_decoders(void)
1233 {
1234 int ret;
1235 struct slot_info *sl;
1236
1237 close_unused_slots();
1238 if (audiod_status != AUDIOD_ON)
1239 return notify_writers(E_NOT_PLAYING);
1240 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1241 return notify_receivers(E_NOT_PLAYING);
1242 if (!must_start_decoder())
1243 return;
1244 ret = open_receiver(stat_task->current_audio_format_num);
1245 if (ret < 0) {
1246 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1247 return;
1248 }
1249 sl = slot + ret;
1250 open_filters(sl);
1251 open_writers(sl);
1252 activate_grab_clients(&sched);
1253 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1254 audiod_status_dump(true);
1255 }
1256
1257 static void status_pre_select(struct sched *s, void *context)
1258 {
1259 struct status_task *st = context;
1260 int i, ret, cafn = stat_task->current_audio_format_num;
1261
1262 if (must_start_decoder())
1263 goto min_delay;
1264 FOR_EACH_SLOT(i)
1265 if (must_close_slot(i))
1266 goto min_delay;
1267 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1268 if (ret > 0)
1269 goto min_delay;
1270 if (st->ct && audiod_status == AUDIOD_OFF)
1271 goto min_delay;
1272 if (!st->ct && audiod_status != AUDIOD_OFF)
1273 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1274 if (cafn >= 0)
1275 sched_request_barrier(&afi[cafn].restart_barrier, s);
1276 /*
1277 * If para_server is playing we'd like to have a smooth time display
1278 * even if we are running in standby mode. So we request a timeout that
1279 * expires at the next full second.
1280 */
1281 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1282 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1283 return;
1284 min_delay:
1285 sched_min_delay(s);
1286 }
1287
1288 /* restart the client task if necessary */
1289 static int status_post_select(struct sched *s, void *context)
1290 {
1291 struct status_task *st = context;
1292 int ret;
1293
1294 ret = task_get_notification(st->task);
1295 if (ret < 0)
1296 return ret;
1297 if (audiod_status == AUDIOD_OFF) {
1298 if (!st->ct)
1299 goto out;
1300 if (task_status(st->ct->task) >= 0) {
1301 task_notify(st->ct->task, E_AUDIOD_OFF);
1302 goto out;
1303 }
1304 close_stat_pipe();
1305 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1306 goto out;
1307 }
1308 if (st->ct) {
1309 char *buf;
1310 size_t sz;
1311
1312 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1313 if (ret < 0) {
1314 close_stat_pipe();
1315 goto out;
1316 }
1317 if (st->ct->status != CL_EXECUTING)
1318 goto out;
1319 if (ret == 0) {
1320 struct timeval diff;
1321 tv_diff(now, &st->last_status_read, &diff);
1322 if (diff.tv_sec > 61)
1323 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1324 goto out;
1325 }
1326 btr_merge(st->btrn, st->min_iqs);
1327 sz = btr_next_buffer(st->btrn, &buf);
1328 ret = for_each_stat_item(buf, sz, update_item);
1329 if (ret < 0) {
1330 task_notify(st->ct->task, -ret);
1331 goto out;
1332 }
1333 if (sz != ret) {
1334 btr_consume(st->btrn, sz - ret);
1335 st->last_status_read = *now;
1336 st->min_iqs = 0;
1337 } else /* current status item crosses buffers */
1338 st->min_iqs = sz + 1;
1339 goto out;
1340 }
1341 btr_drain(st->btrn);
1342 st->current_audio_format_num = -1;
1343 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1344 goto out;
1345 if (st->clock_diff_count) { /* get status only one time */
1346 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1347 int argc = 5;
1348 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1349 st->clock_diff_count--;
1350 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1351 set_stat_task_restart_barrier(2);
1352
1353 } else {
1354 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1355 int argc = 4;
1356 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1357 set_stat_task_restart_barrier(5);
1358 }
1359 free(stat_item_values[SI_basename]);
1360 stat_item_values[SI_basename] = para_strdup(
1361 "no connection to para_server");
1362 stat_client_write_item(SI_basename);
1363 st->last_status_read = *now;
1364 out:
1365 start_stop_decoders();
1366 return 0;
1367 }
1368
1369 static void init_status_task(struct status_task *st)
1370 {
1371 memset(st, 0, sizeof(struct status_task));
1372 st->sa_time_diff_sign = 1;
1373 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1374 st->current_audio_format_num = -1;
1375 st->btrn = btr_new_node(&(struct btr_node_description)
1376 EMBRACE(.name = "stat"));
1377
1378 stat_task->task = task_register(&(struct task_info) {
1379 .name = "stat",
1380 .pre_select = status_pre_select,
1381 .post_select = status_post_select,
1382 .context = stat_task,
1383 }, &sched);
1384 }
1385
1386 static void set_initial_status(void)
1387 {
1388 audiod_status = AUDIOD_ON;
1389 if (!OPT_GIVEN(MODE))
1390 return;
1391 if (!strcmp(OPT_STRING_VAL(MODE), "sb")) {
1392 audiod_status = AUDIOD_STANDBY;
1393 return;
1394 }
1395 if (!strcmp(OPT_STRING_VAL(MODE), "off")) {
1396 audiod_status = AUDIOD_OFF;
1397 return;
1398 }
1399 if (strcmp(OPT_STRING_VAL(MODE), "on"))
1400 PARA_WARNING_LOG("invalid mode\n");
1401 }
1402
1403 /**
1404 * Lookup the given UID in the whitelist.
1405 *
1406 * The whitelist is the array of arguments to the --user-allow opion. If the
1407 * option was not given, the array is empty, in which case the check succeeds.
1408 *
1409 * \param uid User ID to look up.
1410 *
1411 * \return True if --user-allow was not given, or if uid matches an element of
1412 * the whitelist.
1413 */
1414 bool uid_is_whitelisted(uid_t uid)
1415 {
1416 int i;
1417
1418 if (!OPT_GIVEN(USER_ALLOW))
1419 return true;
1420 for (i = 0; i < OPT_GIVEN(USER_ALLOW); i++)
1421 if (uid == uid_whitelist[i])
1422 return true;
1423 return false;
1424 }
1425
1426 static void handle_help_flags(void)
1427 {
1428 char *help;
1429 bool d = OPT_GIVEN(DETAILED_HELP);
1430
1431 if (d)
1432 help = lls_long_help(CMD_PTR);
1433 else if (OPT_GIVEN(HELP))
1434 help = lls_short_help(CMD_PTR);
1435 else
1436 return;
1437 printf("%s\n", help);
1438 free(help);
1439 print_receiver_helps(d);
1440 print_filter_helps(d);
1441 print_writer_helps(d);
1442 exit(EXIT_SUCCESS);
1443 }
1444
1445 /**
1446 * the main function of para_audiod
1447 *
1448 * \param argc usual argument count
1449 * \param argv usual argument vector
1450 *
1451 * \return EXIT_SUCCESS or EXIT_FAILURE
1452 *
1453 * \sa para_audiod(1)
1454 * */
1455 int main(int argc, char *argv[])
1456 {
1457 int ret, i;
1458 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1459 char *errctx;
1460
1461 valid_fd_012();
1462 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
1463 if (ret < 0)
1464 goto out;
1465 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
1466 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
1467 OPT_STRING_VAL(GROUP));
1468 version_handle_flag("audiod", OPT_GIVEN(VERSION));
1469 handle_help_flags();
1470 parse_config_or_die();
1471 crypt_init();
1472 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
1473 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
1474 COLOR_NO, OPT_GIVEN(LOGFILE))) {
1475 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
1476 daemon_set_log_color_or_die(lls_string_val(i,
1477 OPT_RESULT(LOG_COLOR)));
1478 }
1479 daemon_set_flag(DF_LOG_TIME);
1480 daemon_set_flag(DF_LOG_HOSTNAME);
1481 daemon_set_flag(DF_LOG_LL);
1482 if (OPT_GIVEN(LOG_TIMING))
1483 daemon_set_flag(DF_LOG_TIMING);
1484 if (OPT_GIVEN(LOGFILE)) {
1485 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
1486 daemon_open_log_or_die();
1487 }
1488 ret = parse_stream_args();
1489 if (ret < 0) {
1490 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1491 exit(EXIT_FAILURE);
1492 }
1493 daemon_log_welcome("audiod");
1494 daemon_set_start_time();
1495 set_initial_status();
1496 FOR_EACH_SLOT(i)
1497 clear_slot(i);
1498 setup_signal_handling();
1499
1500 init_status_task(stat_task);
1501 init_command_task(cmd_task);
1502
1503 if (OPT_GIVEN(DAEMON))
1504 daemonize(false /* parent exits immediately */);
1505
1506 signal_task->task = task_register(&(struct task_info) {
1507 .name = "signal",
1508 .pre_select = signal_pre_select,
1509 .post_select = signal_post_select,
1510 .context = signal_task,
1511 }, &sched);
1512
1513 sched.default_timeout.tv_sec = 2;
1514 sched.default_timeout.tv_usec = 999 * 1000;
1515 ret = schedule(&sched);
1516 audiod_cleanup();
1517 sched_shutdown(&sched);
1518 signal_shutdown(signal_task);
1519 crypt_shutdown();
1520 out:
1521 lls_free_parse_result(lpr, CMD_PTR);
1522 if (errctx)
1523 PARA_ERROR_LOG("%s\n", errctx);
1524 if (ret < 0)
1525 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1526 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1527 }