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