audiod.c

   1 /*
   2  * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c The paraslash's audio daemon. */
   8
   9 #include <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16 #include <signal.h>
  17 #include <pwd.h>
  18 #include <lopsub.h>
  19
  20 #include "recv_cmd.lsg.h"
  21 #include "client.lsg.h"
  22 #include "para.h"
  23 #include "error.h"
  24 #include "crypt.h"
  25 #include "audiod.cmdline.h"
  26 #include "list.h"
  27 #include "sched.h"
  28 #include "ggo.h"
  29 #include "buffer_tree.h"
  30 #include "recv.h"
  31 #include "filter.h"
  32 #include "grab_client.h"
  33 #include "client.h"
  34 #include "audiod.h"
  35 #include "net.h"
  36 #include "daemon.h"
  37 #include "string.h"
  38 #include "fd.h"
  39 #include "write.h"
  40 #include "write_common.h"
  41 #include "signal.h"
  42 #include "version.h"
  43
  44 /** Array of error strings. */
  45 DEFINE_PARA_ERRLIST;
  46
  47 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  48 /** define the array containing all supported audio formats */
  49 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  50
  51 /** Defines how audiod handles one supported audio format. */
  52 struct audio_format_info {
  53         /** the receiver for this audio format */
  54         int receiver_num;
  55         /** Parsed receiver command line. */
  56         struct lls_parse_result *receiver_lpr;
  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 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
  92 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
  93
  94 /** Maximal number of simultaneous instances. */
  95 #define MAX_STREAM_SLOTS 5
  96
  97 /** Iterate over all slots. */
  98 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
  99
 100 /**
 101  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
 102  * be associated with a receiver/filter/writer triple. This array holds all
 103  * information on the status of these slots.
 104  *
 105  * \sa struct slot_info
 106  * */
 107 struct slot_info slot[MAX_STREAM_SLOTS];
 108
 109 /** The vss status flags audiod is interested in. */
 110 enum vss_status_flags {
 111         /** Whether the 'N' flag is set. */
 112         VSS_STATUS_FLAG_NEXT = 1,
 113         /** The 'P' flag is set. */
 114         VSS_STATUS_FLAG_PLAYING = 2,
 115 };
 116
 117 /**
 118  * The scheduler instance of para_audiod.
 119  *
 120  * This is needed also in audiod_command.c (for the tasks command), so it can
 121  * not be made static.
 122  */
 123 struct sched sched = {.max_fileno = 0};
 124
 125 /* The task for obtaining para_server's status (para_client stat). */
 126 struct status_task {
 127         /** The associated task structure of audiod. */
 128         struct task *task;
 129         /** Client data associated with the stat task. */
 130         struct client_task *ct;
 131         /** Do not restart client command until this time. */
 132         struct timeval restart_barrier;
 133         /** Last time we received status data from para_server. */
 134         struct timeval last_status_read;
 135         size_t min_iqs;
 136         /** The offset value announced by para_server. */
 137         int offset_seconds;
 138         /** The length of the current audio file as announced by para_server. */
 139         int length_seconds;
 140         /** The start of the current stream from the view of para_server. */
 141         struct timeval server_stream_start;
 142         /** The average time deviation between para_server and para_audiod. */
 143         struct timeval sa_time_diff;
 144         /** Whether client time is ahead of server time. */
 145         int sa_time_diff_sign;
 146         /** The 'P' and the 'N' flags as announced by para_server. */
 147         enum vss_status_flags vss_status;
 148         /** Number of times the clock difference is to be checked. */
 149         unsigned clock_diff_count;
 150         /** When to start the next check for clock difference. */
 151         struct timeval clock_diff_barrier;
 152         /** Number of the audio format as announced by para_server. */
 153         int current_audio_format_num;
 154         /* The status task btrn is the child of the client task. */
 155         struct btr_node *btrn;
 156 };
 157
 158 /** The array of status items sent by para_server. */
 159 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 160
 161 /**
 162  * the current mode of operation of which can be changed by the on/off/cycle
 163  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 164  */
 165 int audiod_status = AUDIOD_ON;
 166
 167 /**
 168  * the gengetopt args_info struct that holds information on all command line
 169  * arguments
 170  */
 171 static struct audiod_args_info conf;
 172
 173 static char *socket_name;
 174 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 175
 176 static struct signal_task *signal_task;
 177
 178 static struct status_task status_task_struct;
 179
 180 static uid_t *uid_whitelist;
 181
 182 /**
 183  * the task that calls the status command of para_server
 184  *
 185  * \sa struct status_task
 186  */
 187 static struct status_task *stat_task = &status_task_struct;
 188
 189 /*
 190  * The task for handling audiod commands.
 191  *
 192  * We need two listening sockets for backward compability: on Linux systems
 193  * fd[0] is an abstract socket (more precisely, a socket bound to an address in
 194  * the abstract namespace), and fd[1] is the usual pathname socket. On other
 195  * systems, fd[0] is negative, and only the pathname socket is used.
 196  *
 197  * For 0.5.x we accept connections on both sockets to make sure that old
 198  * para_audioc versions can still connect. New versions use only the abstract
 199  * socket. Hence after v0.6.0 we can go back to a single socket, either an
 200  * abstract one (Linux) or a pathname socket (all other systems).
 201  */
 202 struct command_task {
 203         /** The local listening sockets. */
 204         int fd[2];
 205         /** the associated task structure */
 206         struct task *task;
 207 };
 208
 209 /** iterate over all supported audio formats */
 210 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 211
 212 /**
 213  * Get the audio format number.
 214  *
 215  * \param name The name of the audio format.
 216  *
 217  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 218  * \a name is not a supported audio format.
 219  */
 220 static int get_audio_format_num(const char *name)
 221 {
 222         int i;
 223
 224         while (para_isspace(*name))
 225                 name++;
 226         FOR_EACH_AUDIO_FORMAT(i)
 227                 if (!strcmp(name, audio_formats[i]))
 228                         return i;
 229         return -E_UNSUPPORTED_AUDIO_FORMAT;
 230 }
 231
 232 /**
 233  * Return the flags for the \a decoder_flags status item.
 234  *
 235  * Allocates a string which contains one octal digit per slot.  Bit zero (value
 236  * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
 237  * have the analogous meaning for filter and writer, respectively.
 238  *
 239  * \return String that must be freed by the caller.
 240  */
 241 __malloc char *audiod_get_decoder_flags(void)
 242 {
 243         int i;
 244         char flags[MAX_STREAM_SLOTS + 1];
 245
 246         FOR_EACH_SLOT(i) {
 247                 struct slot_info *s = &slot[i];
 248                 char flag = '0';
 249                 if (s->receiver_node)
 250                         flag += 1;
 251                 if (s->fns)
 252                         flag += 2;
 253                 if (s->wns)
 254                         flag += 4;
 255                 flags[i] = flag;
 256         }
 257         flags[MAX_STREAM_SLOTS] = '\0';
 258         return para_strdup(flags);
 259 }
 260
 261 static int get_matching_audio_format_nums(const char *re)
 262 {
 263         int i, ret;
 264         regex_t preg;
 265
 266         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 267         if (ret < 0)
 268                 return ret;
 269         ret = 0;
 270         FOR_EACH_AUDIO_FORMAT(i)
 271                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 272                         ret |= (1 << i);
 273         regfree(&preg);
 274         return ret;
 275 }
 276
 277 static int get_play_time_slot_num(void)
 278 {
 279         int i, oldest_slot = -1;
 280         struct timeval oldest_wstime = {0, 0};
 281
 282         FOR_EACH_SLOT(i) {
 283                 struct slot_info *s = &slot[i];
 284                 struct timeval wstime;
 285                 if (!s->wns || !s->wns[0].btrn)
 286                         continue;
 287                 btr_get_node_start(s->wns[0].btrn, &wstime);
 288                 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
 289                         continue;
 290                 oldest_wstime = wstime;
 291                 oldest_slot = i;
 292         }
 293         return oldest_slot;
 294 }
 295
 296 /**
 297  * Compute the play time based on information of the current slot.
 298  *
 299  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 300  * from the status items received from para_server and the start time of the
 301  * (first) writer of the current slot.
 302  *
 303  * It has to take into account that the stream was probably not started at
 304  * the beginning of the file, that the clock between the server and the client
 305  * host may differ and that playback of the stream was delayed, e.g. because
 306  * the prebuffer filter is used in the filter configuration.
 307  *
 308  * If no writer is active, for example because para_audiod runs in standby
 309  * mode, an approximation based only on the status items is computed and the
 310  * returned string is prefixed with "~".
 311  *
 312  * \return A string that must be freed by the caller.
 313  */
 314 char *get_time_string(void)
 315 {
 316         int ret, seconds = 0, length = stat_task->length_seconds;
 317         struct timeval *tmp, sum, sss, /* server stream start */
 318                 rstime, /* receiver start time */
 319                 wstime, /* writer start time */
 320                 wtime, /* now - writer start */
 321                 rskip; /* receiver start - sss */
 322         int slot_num = get_play_time_slot_num();
 323         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 324         char *msg;
 325
 326         if (audiod_status == AUDIOD_OFF)
 327                 goto empty;
 328         if (stat_task->server_stream_start.tv_sec == 0) {
 329                 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
 330                         goto out; /* server is about to change file */
 331                 if (length > 0) /* paused */
 332                         return NULL;
 333                 goto empty; /* stopped */
 334         }
 335         /*
 336          * Valid status items and playing, set length and tmp to the stream
 337          * start. We use the slot info and fall back to the info from current
 338          * status items if no slot info is available.
 339          */
 340         tmp = &stat_task->server_stream_start;
 341         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 342                 btr_get_node_start(s->wns[0].btrn, &wstime);
 343                 if (wstime.tv_sec != 0) { /* writer wrote something */
 344                         if (s->server_stream_start.tv_sec == 0) {
 345                                 /* copy status info to slot */
 346                                 s->server_stream_start = stat_task->server_stream_start;
 347                                 s->offset_seconds = stat_task->offset_seconds;
 348                                 s->seconds_total = stat_task->length_seconds;
 349                         }
 350                         length = s->seconds_total;
 351                         tmp = &s->server_stream_start;
 352                 }
 353         }
 354         if (stat_task->sa_time_diff_sign > 0)
 355                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 356         else
 357                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 358         if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
 359                 struct timeval diff;
 360                 tv_diff(now, &sss, &diff);
 361                 seconds = diff.tv_sec + stat_task->offset_seconds;
 362                 goto out;
 363         }
 364         tv_diff(now, &wstime, &wtime);
 365         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 366         seconds = s->offset_seconds;
 367         if (s->receiver_node->btrn) {
 368                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 369                 ret = tv_diff(&rstime, &sss, &rskip);
 370                 if (ret > 0 && rskip.tv_sec > 2) {
 371                         /* audiod was started in the middle of the stream */
 372                         tv_add(&wtime, &rskip, &sum);
 373                         seconds += sum.tv_sec;
 374                 } else
 375                         seconds += wtime.tv_sec;
 376         } else
 377                 seconds += wtime.tv_sec;
 378 out:
 379         seconds = PARA_MIN(seconds, length);
 380         seconds = PARA_MAX(seconds, 0);
 381         msg = make_message(
 382                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 383                 s? "" : "~",
 384                 seconds / 60,
 385                 seconds % 60,
 386                 (length - seconds) / 60,
 387                 (length - seconds) % 60,
 388                 length? (seconds * 100 + length / 2) / length : 0,
 389                 length / 60,
 390                 length % 60
 391         );
 392         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 393         return msg;
 394 empty:
 395         return para_strdup(NULL);
 396 }
 397
 398 static void parse_config_or_die(void)
 399 {
 400         int ret, i;
 401         char *config_file;
 402         struct audiod_cmdline_parser_params params = {
 403                 .override = 0,
 404                 .initialize = 0,
 405                 .check_required = 1,
 406                 .check_ambiguity = 0,
 407                 .print_errors = 1
 408         };
 409
 410         if (conf.config_file_given)
 411                 config_file = para_strdup(conf.config_file_arg);
 412         else {
 413                 char *home = para_homedir();
 414                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 415                 free(home);
 416         }
 417         ret = file_exists(config_file);
 418         if (conf.config_file_given && !ret) {
 419                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 420                 free(config_file);
 421                 goto err;
 422         }
 423         if (ret) {
 424                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 425                 daemon_set_loglevel(conf.loglevel_arg);
 426         }
 427         free(config_file);
 428         if (conf.user_allow_given > 0) {
 429                 uid_whitelist = para_malloc(conf.user_allow_given
 430                         * sizeof(uid_t));
 431                 for (i = 0; i < conf.user_allow_given; i++) {
 432                         int32_t val;
 433                         struct passwd *pw;
 434                         ret = para_atoi32(conf.user_allow_arg[i], &val);
 435                         if (ret >= 0) {
 436                                 uid_whitelist[i] = val;
 437                                 continue;
 438                         }
 439                         errno = 0; /* see getpwnam(3) */
 440                         pw = getpwnam(conf.user_allow_arg[i]);
 441                         if (!pw) {
 442                                 PARA_EMERG_LOG("invalid username: %s\n",
 443                                         conf.user_allow_arg[i]);
 444                                 goto err;
 445                         }
 446                         uid_whitelist[i] = pw->pw_uid;
 447                 }
 448         }
 449         return;
 450 err:
 451         exit(EXIT_FAILURE);
 452 }
 453
 454 static void setup_signal_handling(void)
 455 {
 456         signal_task = signal_init_or_die();
 457         para_install_sighandler(SIGINT);
 458         para_install_sighandler(SIGTERM);
 459         para_install_sighandler(SIGHUP);
 460         para_sigaction(SIGPIPE, SIG_IGN);
 461 }
 462
 463 static void clear_slot(int slot_num)
 464 {
 465         struct slot_info *s = &slot[slot_num];
 466
 467         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 468         memset(s, 0, sizeof(struct slot_info));
 469         s->format = -1;
 470 }
 471
 472 static void close_receiver(int slot_num)
 473 {
 474         struct slot_info *s = &slot[slot_num];
 475         struct audio_format_info *a;
 476
 477         if (s->format < 0 || !s->receiver_node)
 478                 return;
 479         a = &afi[s->format];
 480         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 481                 audio_formats[s->format], slot_num);
 482         RECEIVER(a)->close(s->receiver_node);
 483         btr_remove_node(&s->receiver_node->btrn);
 484         task_reap(&s->receiver_node->task);
 485         free(s->receiver_node);
 486         s->receiver_node = NULL;
 487         stat_task->current_audio_format_num = -1;
 488         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 489                 &a->restart_barrier);
 490 }
 491
 492 static void writer_cleanup(struct writer_node *wn)
 493 {
 494         struct writer *w;
 495
 496         if (!wn)
 497                 return;
 498         w = writers + wn->writer_num;
 499         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 500         w->close(wn);
 501         btr_remove_node(&wn->btrn);
 502         task_reap(&wn->task);
 503 }
 504
 505 static void close_writers(struct slot_info *s)
 506 {
 507         struct audio_format_info *a;
 508         int i;
 509
 510         if (s->format < 0)
 511                 return;
 512         assert(s->wns);
 513         a = afi + s->format;
 514         if (a->num_writers == 0)
 515                 writer_cleanup(s->wns);
 516         else {
 517                 for (i = 0; i < a->num_writers; i++)
 518                         writer_cleanup(s->wns + i);
 519         }
 520         free(s->wns);
 521         s->wns = NULL;
 522 }
 523
 524 static void close_filters(struct slot_info *s)
 525 {
 526         int i;
 527         struct audio_format_info *a = afi + s->format;
 528         if (a->num_filters == 0)
 529                 return;
 530         for (i = a->num_filters - 1; i >= 0; i--) {
 531                 struct filter_node *fn = s->fns + i;
 532                 const struct filter *f;
 533
 534                 if (!fn)
 535                         continue;
 536                 f = filter_get(fn->filter_num);
 537                 if (f->close)
 538                         f->close(fn);
 539                 btr_remove_node(&fn->btrn);
 540                 task_reap(&fn->task);
 541         }
 542         free(s->fns);
 543         s->fns = NULL;
 544 }
 545
 546 static void notify_receivers(int error)
 547 {
 548         int i;
 549
 550         FOR_EACH_SLOT(i) {
 551                 struct slot_info *s = slot + i;
 552                 if (s->format < 0)
 553                         continue;
 554                 if (!s->receiver_node)
 555                         continue;
 556                 task_notify(s->receiver_node->task, error);
 557         }
 558 }
 559
 560 static int get_empty_slot(void)
 561 {
 562         int i;
 563         struct slot_info *s;
 564
 565         FOR_EACH_SLOT(i) {
 566                 s = &slot[i];
 567                 if (s->format < 0) {
 568                         clear_slot(i);
 569                         return i;
 570                 }
 571                 if (s->wns || s->receiver_node || s->fns)
 572                         continue;
 573                 clear_slot(i);
 574                 return i;
 575         }
 576         return -E_NO_MORE_SLOTS;
 577 }
 578
 579 static void open_filters(struct slot_info *s)
 580 {
 581         struct audio_format_info *a = afi + s->format;
 582         struct filter_node *fn;
 583         int nf = a->num_filters;
 584         struct btr_node *parent;
 585         int i;
 586
 587         if (nf == 0)
 588                 return;
 589         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 590         assert(s->fns == NULL);
 591         s->fns = para_calloc(nf * sizeof(struct filter_node));
 592         parent = s->receiver_node->btrn;
 593         for (i = 0; i < nf; i++) {
 594                 char buf[20];
 595                 const struct filter *f = filter_get(a->filter_nums[i]);
 596                 fn = s->fns + i;
 597                 fn->filter_num = a->filter_nums[i];
 598                 fn->conf = a->filter_conf[i];
 599                 fn->btrn = btr_new_node(&(struct btr_node_description)
 600                         EMBRACE(.name = f->name, .parent = parent,
 601                                 .handler = f->execute, .context = fn));
 602
 603                 if (f->open)
 604                         f->open(fn);
 605                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 606                 fn->task = task_register(&(struct task_info) {
 607                         .name = buf,
 608                         .pre_select = f->pre_select,
 609                         .post_select = f->post_select,
 610                         .context = fn,
 611                 }, &sched);
 612                 parent = fn->btrn;
 613                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 614                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 615         }
 616 }
 617
 618 static void open_writers(struct slot_info *s)
 619 {
 620         int i;
 621         struct audio_format_info *a = afi + s->format;
 622         struct writer_node *wn;
 623         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 624
 625         assert(s->wns == NULL);
 626         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 627                 * sizeof(struct writer_node));
 628         for (i = 0; i < a->num_writers; i++) {
 629                 wn = s->wns + i;
 630                 wn->conf = a->writer_conf[i];
 631                 wn->writer_num = a->writer_nums[i];
 632                 register_writer_node(wn, parent, &sched);
 633                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 634                         writer_names[a->writer_nums[i]], (int)(s - slot));
 635         }
 636 }
 637
 638 /* returns slot num on success */
 639 static int open_receiver(int format)
 640 {
 641         struct audio_format_info *a = &afi[format];
 642         struct slot_info *s;
 643         int ret, slot_num;
 644         const struct receiver *r = RECEIVER(a);
 645         const char *name = lls_command_name(RECEIVER_CMD(a));
 646         struct receiver_node *rn;
 647
 648         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 649         ret = get_empty_slot();
 650         if (ret < 0)
 651                 return ret;
 652         slot_num = ret;
 653         rn = para_calloc(sizeof(*rn));
 654         rn->receiver = r;
 655         rn->lpr = a->receiver_lpr;
 656         rn->btrn = btr_new_node(&(struct btr_node_description)
 657                 EMBRACE(.name = name, .context = rn));
 658         ret = r->open(rn);
 659         if (ret < 0) {
 660                 btr_remove_node(&rn->btrn);
 661                 free(rn);
 662                 return ret;
 663         }
 664         s = &slot[slot_num];
 665         s->format = format;
 666         s->receiver_node = rn;
 667         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 668                 audio_formats[format], name, slot_num);
 669         rn->task = task_register(&(struct task_info) {
 670                 .name = name,
 671                 .pre_select = r->pre_select,
 672                 .post_select = r->post_select,
 673                 .context = rn,
 674         }, &sched);
 675         return slot_num;
 676 }
 677
 678 static bool receiver_running(void)
 679 {
 680         int i;
 681         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 682
 683         FOR_EACH_SLOT(i) {
 684                 struct slot_info *s = &slot[i];
 685                 long unsigned ss2 = s->server_stream_start.tv_sec;
 686
 687                 if (!s->receiver_node)
 688                         continue;
 689                 if (task_status(s->receiver_node->task) >= 0)
 690                         return true;
 691                 if (ss1 == ss2)
 692                         return true;
 693         }
 694         return false;
 695 }
 696
 697 /**
 698  * Return the root node of the current buffer tree.
 699  *
 700  * This is only used for stream grabbing.
 701  *
 702  * \return \p NULL if no slot is currently active. If more than one buffer tree
 703  * exists, the node corresponding to the most recently started receiver is
 704  * returned.
 705  */
 706 struct btr_node *audiod_get_btr_root(void)
 707 {
 708         int i, newest_slot = -1;
 709         struct timeval newest_rstime = {0, 0};
 710
 711         FOR_EACH_SLOT(i) {
 712                 struct slot_info *s = &slot[i];
 713                 struct timeval rstime;
 714                 if (!s->receiver_node)
 715                         continue;
 716                 if (task_status(s->receiver_node->task) < 0)
 717                         continue;
 718                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 719                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 720                         continue;
 721                 newest_rstime = rstime;
 722                 newest_slot = i;
 723         }
 724         if (newest_slot == -1)
 725                 return NULL;
 726         return slot[newest_slot].receiver_node->btrn;
 727 }
 728
 729 /* whether a new instance of a decoder should be started. */
 730 static bool must_start_decoder(void)
 731 {
 732         int cafn = stat_task->current_audio_format_num;
 733         unsigned vs = stat_task->vss_status;
 734
 735         if (audiod_status != AUDIOD_ON)
 736                 return false;
 737         if (cafn < 0)
 738                 return false;
 739         if (!stat_task->ct)
 740                 return false;
 741         if (vs & VSS_STATUS_FLAG_NEXT)
 742                 return false;
 743         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 744                 return false;
 745         if (receiver_running())
 746                 return false;
 747         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 748                 return false;
 749         return true;
 750 }
 751
 752 static void compute_time_diff(const struct timeval *status_time)
 753 {
 754         struct timeval tmp, diff;
 755         static unsigned count;
 756         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 757         const struct timeval max_deviation = {0, 500 * 1000};
 758         const int time_smooth = 5;
 759
 760         sign = tv_diff(status_time, now, &diff);
 761 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 762 //                      sign, sa_time_diff_sign);
 763         if (!count) {
 764                 sa_time_diff_sign = sign;
 765                 stat_task->sa_time_diff = diff;
 766                 count++;
 767                 goto out;
 768         }
 769         if (count > 5) {
 770                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 771                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 772                         PARA_WARNING_LOG("time diff jump: %lums\n",
 773                                 s * tv2ms(&tmp));
 774         }
 775         count++;
 776         sa_time_diff_sign = tv_convex_combination(
 777                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 778                 count > 10? sign : sign * time_smooth, &diff,
 779                 &tmp);
 780         stat_task->sa_time_diff = tmp;
 781         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 782                 sign < 0? "-" : "+",
 783                 tv2ms(&diff),
 784                 sa_time_diff_sign < 0? "-" : "+",
 785                 tv2ms(&stat_task->sa_time_diff)
 786         );
 787 out:
 788         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 789 }
 790
 791 static int update_item(int itemnum, char *buf)
 792 {
 793         long unsigned sec, usec;
 794
 795         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 796                 return 1;
 797         free(stat_item_values[itemnum]);
 798         stat_item_values[itemnum] = para_strdup(buf);
 799         stat_client_write_item(itemnum);
 800         switch (itemnum) {
 801         case SI_STATUS_FLAGS:
 802                 stat_task->vss_status = 0;
 803                 if (strchr(buf, 'N'))
 804                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 805                 if (strchr(buf, 'P'))
 806                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 807                 break;
 808         case SI_OFFSET:
 809                 stat_task->offset_seconds = atoi(buf);
 810                 break;
 811         case SI_SECONDS_TOTAL:
 812                 stat_task->length_seconds = atoi(buf);
 813                 break;
 814         case SI_STREAM_START:
 815                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 816                         stat_task->server_stream_start.tv_sec = sec;
 817                         stat_task->server_stream_start.tv_usec = usec;
 818                 }
 819                 break;
 820         case SI_CURRENT_TIME:
 821                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 822                         struct timeval tv = {sec, usec};
 823                         compute_time_diff(&tv);
 824                 }
 825                 break;
 826         case SI_FORMAT:
 827                 stat_task->current_audio_format_num
 828                         = get_audio_format_num(buf);
 829         }
 830         return 1;
 831 }
 832
 833 static int parse_stream_command(const char *txt, const char **cmd)
 834 {
 835         int ret, len;
 836         char *re, *p = strchr(txt, ':');
 837
 838         if (!p)
 839                 return -E_MISSING_COLON;
 840         *cmd = p + 1;
 841         len = p - txt;
 842         re = malloc(len + 1);
 843         strncpy(re, txt, len);
 844         re[len] = '\0';
 845         ret = get_matching_audio_format_nums(re);
 846         free(re);
 847         return ret;
 848 }
 849
 850 static int add_filter(int format, const char *cmdline)
 851 {
 852         struct audio_format_info *a = &afi[format];
 853         int filter_num, nf = a->num_filters;
 854         void *cfg;
 855
 856         filter_num = check_filter_arg(cmdline, &cfg);
 857         if (filter_num < 0)
 858                 return filter_num;
 859         a->filter_conf = para_realloc(a->filter_conf,
 860                 (nf + 1) * sizeof(void *));
 861         a->filter_nums = para_realloc(a->filter_nums,
 862                 (nf + 1) * sizeof(unsigned));
 863         a->filter_nums[nf] = filter_num;
 864         a->filter_conf[nf] = cfg;
 865         a->num_filters++;
 866         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 867                 filter_get(filter_num)->name);
 868         return filter_num;
 869 }
 870
 871 static int parse_writer_args(void)
 872 {
 873         int i, ret;
 874         const char *cmd;
 875         struct audio_format_info *a;
 876
 877         for (i = 0; i < conf.writer_given; i++) {
 878                 void *wconf;
 879                 int j, nw, writer_num, af_mask;
 880
 881                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 882                 if (ret < 0)
 883                         return ret;
 884                 af_mask = ret;
 885                 FOR_EACH_AUDIO_FORMAT(j) {
 886                         a = afi + j;
 887                         if ((af_mask & (1 << j)) == 0) /* no match */
 888                                 continue;
 889                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 890                         nw = a->num_writers;
 891                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 892                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 893                         a->writer_nums[nw] = writer_num;
 894                         a->writer_conf[nw] = wconf;
 895                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 896                                 nw, writer_names[writer_num]);
 897                         a->num_writers++;
 898                 }
 899         }
 900         /* Use default writer for audio formats which are not yet set up. */
 901         FOR_EACH_AUDIO_FORMAT(i) {
 902                 void *writer_conf;
 903                 int writer_num;
 904                 a = afi + i;
 905                 if (a->num_writers > 0)
 906                         continue; /* already set up */
 907                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 908                 a->writer_nums = para_malloc(sizeof(int));
 909                 a->writer_nums[0] = writer_num;
 910                 a->writer_conf = para_malloc(sizeof(void *));
 911                 a->writer_conf[0] = writer_conf;
 912                 a->num_writers = 1;
 913                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 914                         writer_names[writer_num]);
 915         }
 916         return 1;
 917 }
 918
 919 static int parse_receiver_args(void)
 920 {
 921         int i, ret;
 922         const char *arg;
 923         struct audio_format_info *a;
 924
 925         FOR_EACH_AUDIO_FORMAT(i)
 926                 afi[i].receiver_num = -1;
 927         for (i = conf.receiver_given - 1; i >= 0; i--) {
 928                 int j, af_mask;
 929
 930                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 931                 if (ret < 0)
 932                         goto out;
 933                 af_mask = ret;
 934                 FOR_EACH_AUDIO_FORMAT(j) {
 935                         a = afi + j;
 936                         if ((af_mask & (1 << j)) == 0) /* no match */
 937                                 continue;
 938                         /*
 939                          * If multiple receivers are given for this audio format, the
 940                          * last one wins and we have to free the previous receiver
 941                          * config here. Since we are iterating backwards, the winning
 942                          * receiver arg is in fact the first one given.
 943                          */
 944                         lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
 945                         a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
 946                 }
 947         }
 948         /*
 949          * Use the default receiver for those audio formats for which no
 950          * receiver was specified.
 951          */
 952         FOR_EACH_AUDIO_FORMAT(i) {
 953                 a = afi + i;
 954                 if (a->receiver_num >= 0)
 955                         continue;
 956                 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
 957         }
 958         FOR_EACH_AUDIO_FORMAT(i) {
 959                 a = afi + i;
 960                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 961                         audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
 962         }
 963         ret = 1;
 964 out:
 965         return ret;
 966 }
 967
 968 static int init_default_filters(void)
 969 {
 970         int i, ret = 1;
 971
 972         FOR_EACH_AUDIO_FORMAT(i) {
 973                 struct audio_format_info *a = &afi[i];
 974                 const char *name = lls_command_name(RECEIVER_CMD(a));
 975                 char *tmp;
 976                 int j;
 977
 978                 if (a->num_filters)
 979                         continue; /* no default -- nothing to to */
 980                 /*
 981                  * udp and dccp streams are fec-encoded, so add fecdec as the
 982                  * first filter.
 983                  */
 984                 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
 985                         tmp = para_strdup("fecdec");
 986                         add_filter(i, tmp);
 987                         free(tmp);
 988                         if (ret < 0)
 989                                 goto out;
 990                 }
 991                 /* add "dec" to audio format name */
 992                 tmp = make_message("%sdec", audio_formats[i]);
 993                 for (j = 0; filter_get(j); j++)
 994                         if (!strcmp(tmp, filter_get(j)->name))
 995                                 break;
 996                 free(tmp);
 997                 ret = -E_UNSUPPORTED_FILTER;
 998                 if (!filter_get(j))
 999                         goto out;
1000                 tmp = para_strdup(filter_get(j)->name);
1001                 ret = add_filter(i, tmp);
1002                 free(tmp);
1003                 if (ret < 0)
1004                         goto out;
1005                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1006                         filter_get(j)->name);
1007         }
1008 out:
1009         return ret;
1010 }
1011
1012 static int parse_filter_args(void)
1013 {
1014         int i, j, ret, af_mask, num_matches;
1015
1016         for (i = 0; i < conf.filter_given; i++) {
1017                 const char *arg;
1018                 ret = parse_stream_command(conf.filter_arg[i], &arg);
1019                 if (ret < 0)
1020                         goto out;
1021                 af_mask = ret;
1022                 num_matches = 0;
1023                 FOR_EACH_AUDIO_FORMAT(j) {
1024                         if ((af_mask & (1 << j)) == 0) /* no match */
1025                                 continue;
1026                         ret = add_filter(j, arg);
1027                         if (ret < 0)
1028                                 goto out;
1029                         num_matches++;
1030                 }
1031                 if (num_matches == 0)
1032                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
1033                                 conf.filter_arg[i]);
1034         }
1035         ret = init_default_filters(); /* use default values for the rest */
1036 out:
1037         return ret;
1038 }
1039
1040 static int parse_stream_args(void)
1041 {
1042         int ret;
1043
1044         ret = parse_receiver_args();
1045         if (ret < 0)
1046                 return ret;
1047         ret = parse_filter_args();
1048         if (ret < 0)
1049                 return ret;
1050         ret = parse_writer_args();
1051         if (ret < 0)
1052                 return ret;
1053         return 1;
1054 }
1055
1056 /* does not unlink socket on errors */
1057 static void init_local_sockets(struct command_task *ct)
1058 {
1059         if (conf.socket_given)
1060                 socket_name = para_strdup(conf.socket_arg);
1061         else {
1062                 char *hn = para_hostname();
1063                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1064                         hn);
1065                 free(hn);
1066         }
1067         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1068         if (conf.force_given)
1069                 unlink(socket_name);
1070         ct->fd[0] = create_local_socket(socket_name, 0);
1071         ct->fd[1] = create_local_socket(socket_name,
1072                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1073         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1074                 return;
1075         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1076         exit(EXIT_FAILURE);
1077 }
1078
1079 static int signal_post_select(struct sched *s, void *context)
1080 {
1081         struct signal_task *st = context;
1082         int ret, signum;
1083
1084         ret = task_get_notification(st->task);
1085         if (ret < 0)
1086                 return ret;
1087         signum = para_next_signal(&s->rfds);
1088         switch (signum) {
1089         case SIGINT:
1090         case SIGTERM:
1091         case SIGHUP:
1092                 PARA_NOTICE_LOG("received signal %d\n", signum);
1093                 task_notify_all(s, E_AUDIOD_SIGNAL);
1094                 return -E_AUDIOD_SIGNAL;
1095         }
1096         return 0;
1097 }
1098
1099 static void command_pre_select(struct sched *s, void *context)
1100 {
1101         struct command_task *ct = context;
1102         int i;
1103
1104         for (i = 0; i < 2; i++)
1105                 if (ct->fd[i] >= 0)
1106                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1107 }
1108
1109 static int command_post_select(struct sched *s, void *context)
1110 {
1111         int ret, i;
1112         struct command_task *ct = context;
1113         static struct timeval last_status_dump;
1114         struct timeval tmp, delay;
1115         bool force = false;
1116
1117         ret = task_get_notification(ct->task);
1118         if (ret < 0)
1119                 return ret;
1120         for (i = 0; i < 2; i++) {
1121                 if (ct->fd[i] < 0)
1122                         continue;
1123                 ret = handle_connect(ct->fd[i], &s->rfds);
1124                 if (ret < 0) {
1125                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1126                         if (ret == -E_AUDIOD_TERM) {
1127                                 task_notify_all(s, -ret);
1128                                 return ret;
1129                         }
1130                 } else if (ret > 0)
1131                         force = true;
1132         }
1133         if (force == true)
1134                 goto dump;
1135
1136         /* if last status dump was less than 500ms ago, do nothing */
1137         delay.tv_sec = 0;
1138         delay.tv_usec = 500 * 1000;
1139         tv_add(&last_status_dump, &delay, &tmp);
1140         if (tv_diff(now, &tmp, NULL) < 0)
1141                 return 0;
1142
1143         /*
1144          * If last status dump was more than 5s ago, force update. Otherwise,
1145          * update only those items that have changed.
1146          */
1147         delay.tv_sec = 5;
1148         delay.tv_usec = 0;
1149         tv_add(&last_status_dump, &delay, &tmp);
1150         if (tv_diff(now, &tmp, NULL) > 0)
1151                 force = true;
1152 dump:
1153         audiod_status_dump(force);
1154         last_status_dump = *now;
1155         return 1;
1156 }
1157
1158 static void init_command_task(struct command_task *ct)
1159 {
1160         init_local_sockets(ct); /* doesn't return on errors */
1161
1162         ct->task = task_register(&(struct task_info) {
1163                 .name = "command",
1164                 .pre_select = command_pre_select,
1165                 .post_select = command_post_select,
1166                 .context = ct,
1167         }, &sched);
1168 }
1169
1170 static void close_stat_pipe(void)
1171 {
1172         if (!stat_task->ct)
1173                 return;
1174         task_reap(&stat_task->ct->task);
1175         client_close(stat_task->ct);
1176         stat_task->ct = NULL;
1177         clear_and_dump_items();
1178         stat_task->length_seconds = 0;
1179         stat_task->offset_seconds = 0;
1180         stat_task->vss_status = 0;
1181         stat_task->current_audio_format_num = -1;
1182         audiod_status_dump(true);
1183 }
1184
1185 /* avoid busy loop if server is down */
1186 static void set_stat_task_restart_barrier(unsigned seconds)
1187 {
1188         struct timeval delay = {seconds, 0};
1189         tv_add(now, &delay, &stat_task->restart_barrier);
1190 }
1191
1192 static bool must_close_slot(int slot_num)
1193 {
1194         struct slot_info *s = &slot[slot_num];
1195         struct audio_format_info *a = afi + s->format;
1196         int i;
1197
1198         if (s->format < 0)
1199                 return false;
1200         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1201                 return false;
1202         for (i = 0; i < a->num_filters; i++)
1203                 if (s->fns && task_status(s->fns[i].task) >= 0)
1204                         return false;
1205         if (a->num_writers > 0) {
1206                 for (i = 0; i < a->num_writers; i++)
1207                         if (s->wns && task_status(s->wns[i].task) >= 0)
1208                                 return false;
1209         } else {
1210                 if (s->wns && task_status(s->wns[0].task) >= 0)
1211                         return false;
1212         }
1213         return true;
1214 }
1215
1216 static void close_slot(int slot_num)
1217 {
1218         struct slot_info *s = slot + slot_num;
1219
1220         PARA_INFO_LOG("closing slot %d\n", slot_num);
1221         close_writers(s);
1222         close_filters(s);
1223         close_receiver(slot_num);
1224         clear_slot(slot_num);
1225 }
1226
1227 static void close_unused_slots(void)
1228 {
1229         int i;
1230         bool dump = false;
1231
1232         FOR_EACH_SLOT(i)
1233                 if (must_close_slot(i)) {
1234                         close_slot(i);
1235                         dump = true;
1236                 }
1237         if (dump)
1238                 audiod_status_dump(true);
1239 }
1240
1241 /*
1242  * Cleanup all resources.
1243  *
1244  * This performs various cleanups, removes the audiod socket and closes the
1245  * connection to para_server.
1246  */
1247 static void audiod_cleanup(void)
1248 {
1249         if (socket_name)
1250                 unlink(socket_name);
1251         close_stat_pipe();
1252         close_unused_slots();
1253         audiod_cmdline_parser_free(&conf);
1254         close_stat_clients();
1255         free(uid_whitelist);
1256 }
1257
1258 /*
1259  * Check if any receivers/filters/writers need to be started and do so if
1260  * necessary.
1261  */
1262 static void start_stop_decoders(void)
1263 {
1264         int ret;
1265         struct slot_info *sl;
1266
1267         close_unused_slots();
1268         if (audiod_status != AUDIOD_ON ||
1269                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1270                 return notify_receivers(E_NOT_PLAYING);
1271         if (!must_start_decoder())
1272                 return;
1273         ret = open_receiver(stat_task->current_audio_format_num);
1274         if (ret < 0) {
1275                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1276                 return;
1277         }
1278         sl = slot + ret;
1279         open_filters(sl);
1280         open_writers(sl);
1281         activate_grab_clients(&sched);
1282         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1283         audiod_status_dump(true);
1284 }
1285
1286 static void status_pre_select(struct sched *s, void *context)
1287 {
1288         struct status_task *st = context;
1289         int i, ret, cafn = stat_task->current_audio_format_num;
1290
1291         if (must_start_decoder())
1292                 goto min_delay;
1293         FOR_EACH_SLOT(i)
1294                 if (must_close_slot(i))
1295                         goto min_delay;
1296         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1297         if (ret > 0)
1298                 goto min_delay;
1299         if (st->ct && audiod_status == AUDIOD_OFF)
1300                 goto min_delay;
1301         if (!st->ct && audiod_status != AUDIOD_OFF)
1302                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1303         if (cafn >= 0)
1304                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1305         /*
1306          * If para_server is playing we'd like to have a smooth time display
1307          * even if we are running in standby mode. So we request a timeout that
1308          * expires at the next full second.
1309          */
1310         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1311                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1312         return;
1313 min_delay:
1314         sched_min_delay(s);
1315 }
1316
1317 /* restart the client task if necessary */
1318 static int status_post_select(struct sched *s, void *context)
1319 {
1320         struct status_task *st = context;
1321         int ret;
1322
1323         ret = task_get_notification(st->task);
1324         if (ret < 0)
1325                 return ret;
1326         if (audiod_status == AUDIOD_OFF) {
1327                 if (!st->ct)
1328                         goto out;
1329                 if (task_status(st->ct->task) >= 0) {
1330                         task_notify(st->ct->task, E_AUDIOD_OFF);
1331                         goto out;
1332                 }
1333                 close_stat_pipe();
1334                 st->clock_diff_count = conf.clock_diff_count_arg;
1335                 goto out;
1336         }
1337         if (st->ct) {
1338                 char *buf;
1339                 size_t sz;
1340
1341                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1342                 if (ret < 0) {
1343                         close_stat_pipe();
1344                         goto out;
1345                 }
1346                 if (st->ct->status != CL_EXECUTING)
1347                         goto out;
1348                 if (ret == 0) {
1349                         struct timeval diff;
1350                         tv_diff(now, &st->last_status_read, &diff);
1351                         if (diff.tv_sec > 61)
1352                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1353                         goto out;
1354                 }
1355                 btr_merge(st->btrn, st->min_iqs);
1356                 sz = btr_next_buffer(st->btrn, &buf);
1357                 ret = for_each_stat_item(buf, sz, update_item);
1358                 if (ret < 0) {
1359                         task_notify(st->ct->task, -ret);
1360                         goto out;
1361                 }
1362                 if (sz != ret) {
1363                         btr_consume(st->btrn, sz - ret);
1364                         st->last_status_read = *now;
1365                         st->min_iqs = 0;
1366                 } else /* current status item crosses buffers */
1367                         st->min_iqs = sz + 1;
1368                 goto out;
1369         }
1370         btr_drain(st->btrn);
1371         st->current_audio_format_num = -1;
1372         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1373                 goto out;
1374         if (st->clock_diff_count) { /* get status only one time */
1375                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1376                 int argc = 5;
1377                 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1378                 st->clock_diff_count--;
1379                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1380                 set_stat_task_restart_barrier(2);
1381
1382         } else {
1383                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1384                 int argc = 4;
1385                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1386                 set_stat_task_restart_barrier(5);
1387         }
1388         free(stat_item_values[SI_BASENAME]);
1389         stat_item_values[SI_BASENAME] = para_strdup(
1390                 "no connection to para_server");
1391         stat_client_write_item(SI_BASENAME);
1392         st->last_status_read = *now;
1393 out:
1394         start_stop_decoders();
1395         return 0;
1396 }
1397
1398 static void init_status_task(struct status_task *st)
1399 {
1400         memset(st, 0, sizeof(struct status_task));
1401         st->sa_time_diff_sign = 1;
1402         st->clock_diff_count = conf.clock_diff_count_arg;
1403         st->current_audio_format_num = -1;
1404         st->btrn = btr_new_node(&(struct btr_node_description)
1405                 EMBRACE(.name = "stat"));
1406
1407         stat_task->task = task_register(&(struct task_info) {
1408                 .name = "stat",
1409                 .pre_select = status_pre_select,
1410                 .post_select = status_post_select,
1411                 .context = stat_task,
1412         }, &sched);
1413 }
1414
1415 static void set_initial_status(void)
1416 {
1417         audiod_status = AUDIOD_ON;
1418         if (!conf.mode_given)
1419                 return;
1420         if (!strcmp(conf.mode_arg, "sb")) {
1421                 audiod_status = AUDIOD_STANDBY;
1422                 return;
1423         }
1424         if (!strcmp(conf.mode_arg, "off")) {
1425                 audiod_status = AUDIOD_OFF;
1426                 return;
1427         }
1428         if (strcmp(conf.mode_arg, "on"))
1429                 PARA_WARNING_LOG("invalid mode\n");
1430 }
1431
1432 __noreturn static void print_help_and_die(void)
1433 {
1434         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1435         bool d = conf.detailed_help_given;
1436         unsigned flags;
1437
1438         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1439         ggo_print_help(&h, flags);
1440
1441         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1442         print_receiver_helps(flags);
1443         print_filter_helps(flags);
1444         print_writer_helps(flags);
1445         exit(0);
1446 }
1447
1448 /**
1449  * Lookup the given UID in the whitelist.
1450  *
1451  * The whitelist is the array of arguments to the --user-allow opion. If the
1452  * option was not given, the array is empty, in which case the check succeeds.
1453  *
1454  * \param uid User ID to look up.
1455  *
1456  * \return True if --user-allow was not given, or if uid matches an element of
1457  * the whitelist.
1458  */
1459 bool uid_is_whitelisted(uid_t uid)
1460 {
1461         int i;
1462
1463         if (!conf.user_allow_given)
1464                 return true;
1465         for (i = 0; i < conf.user_allow_given; i++)
1466                 if (uid == uid_whitelist[i])
1467                         return true;
1468         return false;
1469 }
1470
1471 /**
1472  * the main function of para_audiod
1473  *
1474  * \param argc usual argument count
1475  * \param argv usual argument vector
1476  *
1477  * \return EXIT_SUCCESS or EXIT_FAILURE
1478  *
1479  * \sa para_audiod(1)
1480  * */
1481 int main(int argc, char *argv[])
1482 {
1483         int ret, i;
1484         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1485         struct audiod_cmdline_parser_params params = {
1486                 .override = 0,
1487                 .initialize = 1,
1488                 .check_required = 0,
1489                 .check_ambiguity = 0,
1490                 .print_errors = 1
1491         };
1492
1493         valid_fd_012();
1494         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1495         daemon_set_loglevel(conf.loglevel_arg);
1496         version_handle_flag("audiod", conf.version_given);
1497         /* init receivers/filters/writers early to make help work */
1498         recv_init();
1499         filter_init();
1500         writer_init();
1501         if (conf.help_given || conf.detailed_help_given)
1502                 print_help_and_die();
1503         daemon_set_priority(conf.priority_arg);
1504         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1505         parse_config_or_die();
1506         if (daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1507                 conf.logfile_given)) {
1508                         for (i = 0; i < conf.log_color_given; i++)
1509                                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1510         }
1511         init_random_seed_or_die();
1512         daemon_set_flag(DF_LOG_TIME);
1513         daemon_set_flag(DF_LOG_HOSTNAME);
1514         daemon_set_flag(DF_LOG_LL);
1515         if (conf.log_timing_given)
1516                 daemon_set_flag(DF_LOG_TIMING);
1517         if (conf.logfile_given) {
1518                 daemon_set_logfile(conf.logfile_arg);
1519                 daemon_open_log_or_die();
1520         }
1521         ret = parse_stream_args();
1522         if (ret < 0) {
1523                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1524                 exit(EXIT_FAILURE);
1525         }
1526         daemon_log_welcome("audiod");
1527         daemon_set_start_time();
1528         set_initial_status();
1529         FOR_EACH_SLOT(i)
1530                 clear_slot(i);
1531         setup_signal_handling();
1532
1533         init_status_task(stat_task);
1534         init_command_task(cmd_task);
1535
1536         if (conf.daemon_given)
1537                 daemonize(false /* parent exits immediately */);
1538
1539         signal_task->task = task_register(&(struct task_info) {
1540                 .name = "signal",
1541                 .pre_select = signal_pre_select,
1542                 .post_select = signal_post_select,
1543                 .context = signal_task,
1544         }, &sched);
1545
1546         sched.default_timeout.tv_sec = 2;
1547         sched.default_timeout.tv_usec = 999 * 1000;
1548         ret = schedule(&sched);
1549         audiod_cleanup();
1550         sched_shutdown(&sched);
1551         signal_shutdown(signal_task);
1552
1553         if (ret < 0)
1554                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1555         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1556 }