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         /** Parsed filter command line, one parse result per filter. */
  64         struct lls_parse_result **filter_lpr;
  65         /** the number of filters that should be activated for this audio format */
  66         unsigned int num_writers;
  67         /** Array of writer numbers to be activated. */
  68         int *writer_nums;
  69         /** pointer to the array of writer configurations */
  70         void **writer_conf;
  71         /** do not start receiver/filters/writer before this time */
  72         struct timeval restart_barrier;
  73 };
  74
  75 /* Describes one instance of a receiver-filter-writer chain. */
  76 struct slot_info {
  77         /* Number of the audio format in this slot. */
  78         int format;
  79         /* The stream_start status item announced by para_server.  */
  80         struct timeval server_stream_start;
  81         /* The offset status item announced by para_server. */
  82         unsigned offset_seconds;
  83         /* The seconds_total status item announced by para_server. */
  84         unsigned seconds_total;
  85         /* The receiver info associated with this slot. */
  86         struct receiver_node *receiver_node;
  87         /* The array of filter nodes. */
  88         struct filter_node *fns;
  89         /* The array of writers attached to the last filter. */
  90         struct writer_node *wns;
  91 };
  92
  93 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
  94 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
  95
  96 /** Maximal number of simultaneous instances. */
  97 #define MAX_STREAM_SLOTS 5
  98
  99 /** Iterate over all slots. */
 100 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
 101
 102 /**
 103  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
 104  * be associated with a receiver/filter/writer triple. This array holds all
 105  * information on the status of these slots.
 106  *
 107  * \sa struct slot_info
 108  * */
 109 struct slot_info slot[MAX_STREAM_SLOTS];
 110
 111 /** The vss status flags audiod is interested in. */
 112 enum vss_status_flags {
 113         /** Whether the 'N' flag is set. */
 114         VSS_STATUS_FLAG_NEXT = 1,
 115         /** The 'P' flag is set. */
 116         VSS_STATUS_FLAG_PLAYING = 2,
 117 };
 118
 119 /**
 120  * The scheduler instance of para_audiod.
 121  *
 122  * This is needed also in audiod_command.c (for the tasks command), so it can
 123  * not be made static.
 124  */
 125 struct sched sched = {.max_fileno = 0};
 126
 127 /* The task for obtaining para_server's status (para_client stat). */
 128 struct status_task {
 129         /** The associated task structure of audiod. */
 130         struct task *task;
 131         /** Client data associated with the stat task. */
 132         struct client_task *ct;
 133         /** Do not restart client command until this time. */
 134         struct timeval restart_barrier;
 135         /** Last time we received status data from para_server. */
 136         struct timeval last_status_read;
 137         size_t min_iqs;
 138         /** The offset value announced by para_server. */
 139         int offset_seconds;
 140         /** The length of the current audio file as announced by para_server. */
 141         int length_seconds;
 142         /** The start of the current stream from the view of para_server. */
 143         struct timeval server_stream_start;
 144         /** The average time deviation between para_server and para_audiod. */
 145         struct timeval sa_time_diff;
 146         /** Whether client time is ahead of server time. */
 147         int sa_time_diff_sign;
 148         /** The 'P' and the 'N' flags as announced by para_server. */
 149         enum vss_status_flags vss_status;
 150         /** Number of times the clock difference is to be checked. */
 151         unsigned clock_diff_count;
 152         /** When to start the next check for clock difference. */
 153         struct timeval clock_diff_barrier;
 154         /** Number of the audio format as announced by para_server. */
 155         int current_audio_format_num;
 156         /* The status task btrn is the child of the client task. */
 157         struct btr_node *btrn;
 158 };
 159
 160 /** The array of status items sent by para_server. */
 161 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 162
 163 /**
 164  * the current mode of operation of which can be changed by the on/off/cycle
 165  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 166  */
 167 int audiod_status = AUDIOD_ON;
 168
 169 /**
 170  * the gengetopt args_info struct that holds information on all command line
 171  * arguments
 172  */
 173 static struct audiod_args_info conf;
 174
 175 static char *socket_name;
 176 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 177
 178 static struct signal_task *signal_task;
 179
 180 static struct status_task status_task_struct;
 181
 182 static uid_t *uid_whitelist;
 183
 184 /**
 185  * the task that calls the status command of para_server
 186  *
 187  * \sa struct status_task
 188  */
 189 static struct status_task *stat_task = &status_task_struct;
 190
 191 /*
 192  * The task for handling audiod commands.
 193  *
 194  * We need two listening sockets for backward compability: on Linux systems
 195  * fd[0] is an abstract socket (more precisely, a socket bound to an address in
 196  * the abstract namespace), and fd[1] is the usual pathname socket. On other
 197  * systems, fd[0] is negative, and only the pathname socket is used.
 198  *
 199  * For 0.5.x we accept connections on both sockets to make sure that old
 200  * para_audioc versions can still connect. New versions use only the abstract
 201  * socket. Hence after v0.6.0 we can go back to a single socket, either an
 202  * abstract one (Linux) or a pathname socket (all other systems).
 203  */
 204 struct command_task {
 205         /** The local listening sockets. */
 206         int fd[2];
 207         /** the associated task structure */
 208         struct task *task;
 209 };
 210
 211 /** iterate over all supported audio formats */
 212 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 213
 214 /**
 215  * Get the audio format number.
 216  *
 217  * \param name The name of the audio format.
 218  *
 219  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 220  * \a name is not a supported audio format.
 221  */
 222 static int get_audio_format_num(const char *name)
 223 {
 224         int i;
 225
 226         while (para_isspace(*name))
 227                 name++;
 228         FOR_EACH_AUDIO_FORMAT(i)
 229                 if (!strcmp(name, audio_formats[i]))
 230                         return i;
 231         return -E_UNSUPPORTED_AUDIO_FORMAT;
 232 }
 233
 234 /**
 235  * Return the flags for the \a decoder_flags status item.
 236  *
 237  * Allocates a string which contains one octal digit per slot.  Bit zero (value
 238  * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
 239  * have the analogous meaning for filter and writer, respectively.
 240  *
 241  * \return String that must be freed by the caller.
 242  */
 243 __malloc char *audiod_get_decoder_flags(void)
 244 {
 245         int i;
 246         char flags[MAX_STREAM_SLOTS + 1];
 247
 248         FOR_EACH_SLOT(i) {
 249                 struct slot_info *s = &slot[i];
 250                 char flag = '0';
 251                 if (s->receiver_node)
 252                         flag += 1;
 253                 if (s->fns)
 254                         flag += 2;
 255                 if (s->wns)
 256                         flag += 4;
 257                 flags[i] = flag;
 258         }
 259         flags[MAX_STREAM_SLOTS] = '\0';
 260         return para_strdup(flags);
 261 }
 262
 263 static int get_matching_audio_format_nums(const char *re)
 264 {
 265         int i, ret;
 266         regex_t preg;
 267
 268         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 269         if (ret < 0)
 270                 return ret;
 271         ret = 0;
 272         FOR_EACH_AUDIO_FORMAT(i)
 273                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 274                         ret |= (1 << i);
 275         regfree(&preg);
 276         return ret;
 277 }
 278
 279 static int get_play_time_slot_num(void)
 280 {
 281         int i, oldest_slot = -1;
 282         struct timeval oldest_wstime = {0, 0};
 283
 284         FOR_EACH_SLOT(i) {
 285                 struct slot_info *s = &slot[i];
 286                 struct timeval wstime;
 287                 if (!s->wns || !s->wns[0].btrn)
 288                         continue;
 289                 btr_get_node_start(s->wns[0].btrn, &wstime);
 290                 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
 291                         continue;
 292                 oldest_wstime = wstime;
 293                 oldest_slot = i;
 294         }
 295         return oldest_slot;
 296 }
 297
 298 /**
 299  * Compute the play time based on information of the current slot.
 300  *
 301  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 302  * from the status items received from para_server and the start time of the
 303  * (first) writer of the current slot.
 304  *
 305  * It has to take into account that the stream was probably not started at
 306  * the beginning of the file, that the clock between the server and the client
 307  * host may differ and that playback of the stream was delayed, e.g. because
 308  * the prebuffer filter is used in the filter configuration.
 309  *
 310  * If no writer is active, for example because para_audiod runs in standby
 311  * mode, an approximation based only on the status items is computed and the
 312  * returned string is prefixed with "~".
 313  *
 314  * \return A string that must be freed by the caller.
 315  */
 316 char *get_time_string(void)
 317 {
 318         int ret, seconds = 0, length = stat_task->length_seconds;
 319         struct timeval *tmp, sum, sss, /* server stream start */
 320                 rstime, /* receiver start time */
 321                 wstime, /* writer start time */
 322                 wtime, /* now - writer start */
 323                 rskip; /* receiver start - sss */
 324         int slot_num = get_play_time_slot_num();
 325         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 326         char *msg;
 327
 328         if (audiod_status == AUDIOD_OFF)
 329                 goto empty;
 330         if (stat_task->server_stream_start.tv_sec == 0) {
 331                 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
 332                         goto out; /* server is about to change file */
 333                 if (length > 0) /* paused */
 334                         return NULL;
 335                 goto empty; /* stopped */
 336         }
 337         /*
 338          * Valid status items and playing, set length and tmp to the stream
 339          * start. We use the slot info and fall back to the info from current
 340          * status items if no slot info is available.
 341          */
 342         tmp = &stat_task->server_stream_start;
 343         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 344                 btr_get_node_start(s->wns[0].btrn, &wstime);
 345                 if (wstime.tv_sec != 0) { /* writer wrote something */
 346                         if (s->server_stream_start.tv_sec == 0) {
 347                                 /* copy status info to slot */
 348                                 s->server_stream_start = stat_task->server_stream_start;
 349                                 s->offset_seconds = stat_task->offset_seconds;
 350                                 s->seconds_total = stat_task->length_seconds;
 351                         }
 352                         length = s->seconds_total;
 353                         tmp = &s->server_stream_start;
 354                 }
 355         }
 356         if (stat_task->sa_time_diff_sign > 0)
 357                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 358         else
 359                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 360         if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
 361                 struct timeval diff;
 362                 tv_diff(now, &sss, &diff);
 363                 seconds = diff.tv_sec + stat_task->offset_seconds;
 364                 goto out;
 365         }
 366         tv_diff(now, &wstime, &wtime);
 367         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 368         seconds = s->offset_seconds;
 369         if (s->receiver_node->btrn) {
 370                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 371                 ret = tv_diff(&rstime, &sss, &rskip);
 372                 if (ret > 0 && rskip.tv_sec > 2) {
 373                         /* audiod was started in the middle of the stream */
 374                         tv_add(&wtime, &rskip, &sum);
 375                         seconds += sum.tv_sec;
 376                 } else
 377                         seconds += wtime.tv_sec;
 378         } else
 379                 seconds += wtime.tv_sec;
 380 out:
 381         seconds = PARA_MIN(seconds, length);
 382         seconds = PARA_MAX(seconds, 0);
 383         msg = make_message(
 384                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 385                 s? "" : "~",
 386                 seconds / 60,
 387                 seconds % 60,
 388                 (length - seconds) / 60,
 389                 (length - seconds) % 60,
 390                 length? (seconds * 100 + length / 2) / length : 0,
 391                 length / 60,
 392                 length % 60
 393         );
 394         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 395         return msg;
 396 empty:
 397         return para_strdup(NULL);
 398 }
 399
 400 static void parse_config_or_die(void)
 401 {
 402         int ret, i;
 403         char *config_file;
 404         struct audiod_cmdline_parser_params params = {
 405                 .override = 0,
 406                 .initialize = 0,
 407                 .check_required = 1,
 408                 .check_ambiguity = 0,
 409                 .print_errors = 1
 410         };
 411
 412         if (conf.config_file_given)
 413                 config_file = para_strdup(conf.config_file_arg);
 414         else {
 415                 char *home = para_homedir();
 416                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 417                 free(home);
 418         }
 419         ret = file_exists(config_file);
 420         if (conf.config_file_given && !ret) {
 421                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 422                 free(config_file);
 423                 goto err;
 424         }
 425         if (ret) {
 426                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 427                 daemon_set_loglevel(conf.loglevel_arg);
 428         }
 429         free(config_file);
 430         if (conf.user_allow_given > 0) {
 431                 uid_whitelist = para_malloc(conf.user_allow_given
 432                         * sizeof(uid_t));
 433                 for (i = 0; i < conf.user_allow_given; i++) {
 434                         int32_t val;
 435                         struct passwd *pw;
 436                         ret = para_atoi32(conf.user_allow_arg[i], &val);
 437                         if (ret >= 0) {
 438                                 uid_whitelist[i] = val;
 439                                 continue;
 440                         }
 441                         errno = 0; /* see getpwnam(3) */
 442                         pw = getpwnam(conf.user_allow_arg[i]);
 443                         if (!pw) {
 444                                 PARA_EMERG_LOG("invalid username: %s\n",
 445                                         conf.user_allow_arg[i]);
 446                                 goto err;
 447                         }
 448                         uid_whitelist[i] = pw->pw_uid;
 449                 }
 450         }
 451         return;
 452 err:
 453         exit(EXIT_FAILURE);
 454 }
 455
 456 static void setup_signal_handling(void)
 457 {
 458         signal_task = signal_init_or_die();
 459         para_install_sighandler(SIGINT);
 460         para_install_sighandler(SIGTERM);
 461         para_install_sighandler(SIGHUP);
 462         para_sigaction(SIGPIPE, SIG_IGN);
 463 }
 464
 465 static void clear_slot(int slot_num)
 466 {
 467         struct slot_info *s = &slot[slot_num];
 468
 469         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 470         memset(s, 0, sizeof(struct slot_info));
 471         s->format = -1;
 472 }
 473
 474 static void close_receiver(int slot_num)
 475 {
 476         struct slot_info *s = &slot[slot_num];
 477         struct audio_format_info *a;
 478
 479         if (s->format < 0 || !s->receiver_node)
 480                 return;
 481         a = &afi[s->format];
 482         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 483                 audio_formats[s->format], slot_num);
 484         RECEIVER(a)->close(s->receiver_node);
 485         btr_remove_node(&s->receiver_node->btrn);
 486         task_reap(&s->receiver_node->task);
 487         free(s->receiver_node);
 488         s->receiver_node = NULL;
 489         stat_task->current_audio_format_num = -1;
 490         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 491                 &a->restart_barrier);
 492 }
 493
 494 static void writer_cleanup(struct writer_node *wn)
 495 {
 496         struct writer *w;
 497
 498         if (!wn)
 499                 return;
 500         w = writers + wn->writer_num;
 501         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 502         w->close(wn);
 503         btr_remove_node(&wn->btrn);
 504         task_reap(&wn->task);
 505 }
 506
 507 static void close_writers(struct slot_info *s)
 508 {
 509         struct audio_format_info *a;
 510         int i;
 511
 512         if (s->format < 0)
 513                 return;
 514         assert(s->wns);
 515         a = afi + s->format;
 516         if (a->num_writers == 0)
 517                 writer_cleanup(s->wns);
 518         else {
 519                 for (i = 0; i < a->num_writers; i++)
 520                         writer_cleanup(s->wns + i);
 521         }
 522         free(s->wns);
 523         s->wns = NULL;
 524 }
 525
 526 static void close_filters(struct slot_info *s)
 527 {
 528         int i;
 529         struct audio_format_info *a = afi + s->format;
 530         if (a->num_filters == 0)
 531                 return;
 532         for (i = a->num_filters - 1; i >= 0; i--) {
 533                 struct filter_node *fn = s->fns + i;
 534                 const struct filter *f;
 535
 536                 if (!fn)
 537                         continue;
 538                 f = filter_get(fn->filter_num);
 539                 if (f->close)
 540                         f->close(fn);
 541                 btr_remove_node(&fn->btrn);
 542                 task_reap(&fn->task);
 543         }
 544         free(s->fns);
 545         s->fns = NULL;
 546 }
 547
 548 static void notify_receivers(int error)
 549 {
 550         int i;
 551
 552         FOR_EACH_SLOT(i) {
 553                 struct slot_info *s = slot + i;
 554                 if (s->format < 0)
 555                         continue;
 556                 if (!s->receiver_node)
 557                         continue;
 558                 task_notify(s->receiver_node->task, error);
 559         }
 560 }
 561
 562 static int get_empty_slot(void)
 563 {
 564         int i;
 565         struct slot_info *s;
 566
 567         FOR_EACH_SLOT(i) {
 568                 s = &slot[i];
 569                 if (s->format < 0) {
 570                         clear_slot(i);
 571                         return i;
 572                 }
 573                 if (s->wns || s->receiver_node || s->fns)
 574                         continue;
 575                 clear_slot(i);
 576                 return i;
 577         }
 578         return -E_NO_MORE_SLOTS;
 579 }
 580
 581 static void open_filters(struct slot_info *s)
 582 {
 583         struct audio_format_info *a = afi + s->format;
 584         struct filter_node *fn;
 585         int nf = a->num_filters;
 586         struct btr_node *parent;
 587         int i;
 588
 589         if (nf == 0)
 590                 return;
 591         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 592         assert(s->fns == NULL);
 593         s->fns = para_calloc(nf * sizeof(struct filter_node));
 594         parent = s->receiver_node->btrn;
 595         for (i = 0; i < nf; i++) {
 596                 char buf[20];
 597                 const char *name;
 598                 const struct filter *f = filter_get(a->filter_nums[i]);
 599                 fn = s->fns + i;
 600                 fn->filter_num = a->filter_nums[i];
 601                 fn->conf = a->filter_conf[i];
 602                 fn->lpr = a->filter_lpr[i];
 603                 name = filter_name(fn->filter_num);
 604                 fn->btrn = btr_new_node(&(struct btr_node_description)
 605                         EMBRACE(.name = name, .parent = parent,
 606                                 .handler = f->execute, .context = fn));
 607
 608                 if (f->open)
 609                         f->open(fn);
 610                 sprintf(buf, "%s (slot %d)", name, (int)(s - slot));
 611                 fn->task = task_register(&(struct task_info) {
 612                         .name = buf,
 613                         .pre_select = f->pre_select,
 614                         .post_select = f->post_select,
 615                         .context = fn,
 616                 }, &sched);
 617                 parent = fn->btrn;
 618                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 619                         audio_formats[s->format], i,  nf, name, (int)(s - slot));
 620         }
 621 }
 622
 623 static void open_writers(struct slot_info *s)
 624 {
 625         int i;
 626         struct audio_format_info *a = afi + s->format;
 627         struct writer_node *wn;
 628         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 629
 630         assert(s->wns == NULL);
 631         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 632                 * sizeof(struct writer_node));
 633         for (i = 0; i < a->num_writers; i++) {
 634                 wn = s->wns + i;
 635                 wn->conf = a->writer_conf[i];
 636                 wn->writer_num = a->writer_nums[i];
 637                 register_writer_node(wn, parent, &sched);
 638                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 639                         writer_names[a->writer_nums[i]], (int)(s - slot));
 640         }
 641 }
 642
 643 /* returns slot num on success */
 644 static int open_receiver(int format)
 645 {
 646         struct audio_format_info *a = &afi[format];
 647         struct slot_info *s;
 648         int ret, slot_num;
 649         const struct receiver *r = RECEIVER(a);
 650         const char *name = lls_command_name(RECEIVER_CMD(a));
 651         struct receiver_node *rn;
 652
 653         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 654         ret = get_empty_slot();
 655         if (ret < 0)
 656                 return ret;
 657         slot_num = ret;
 658         rn = para_calloc(sizeof(*rn));
 659         rn->receiver = r;
 660         rn->lpr = a->receiver_lpr;
 661         rn->btrn = btr_new_node(&(struct btr_node_description)
 662                 EMBRACE(.name = name, .context = rn));
 663         ret = r->open(rn);
 664         if (ret < 0) {
 665                 btr_remove_node(&rn->btrn);
 666                 free(rn);
 667                 return ret;
 668         }
 669         s = &slot[slot_num];
 670         s->format = format;
 671         s->receiver_node = rn;
 672         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 673                 audio_formats[format], name, slot_num);
 674         rn->task = task_register(&(struct task_info) {
 675                 .name = name,
 676                 .pre_select = r->pre_select,
 677                 .post_select = r->post_select,
 678                 .context = rn,
 679         }, &sched);
 680         return slot_num;
 681 }
 682
 683 static bool receiver_running(void)
 684 {
 685         int i;
 686         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 687
 688         FOR_EACH_SLOT(i) {
 689                 struct slot_info *s = &slot[i];
 690                 long unsigned ss2 = s->server_stream_start.tv_sec;
 691
 692                 if (!s->receiver_node)
 693                         continue;
 694                 if (task_status(s->receiver_node->task) >= 0)
 695                         return true;
 696                 if (ss1 == ss2)
 697                         return true;
 698         }
 699         return false;
 700 }
 701
 702 /**
 703  * Return the root node of the current buffer tree.
 704  *
 705  * This is only used for stream grabbing.
 706  *
 707  * \return \p NULL if no slot is currently active. If more than one buffer tree
 708  * exists, the node corresponding to the most recently started receiver is
 709  * returned.
 710  */
 711 struct btr_node *audiod_get_btr_root(void)
 712 {
 713         int i, newest_slot = -1;
 714         struct timeval newest_rstime = {0, 0};
 715
 716         FOR_EACH_SLOT(i) {
 717                 struct slot_info *s = &slot[i];
 718                 struct timeval rstime;
 719                 if (!s->receiver_node)
 720                         continue;
 721                 if (task_status(s->receiver_node->task) < 0)
 722                         continue;
 723                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 724                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 725                         continue;
 726                 newest_rstime = rstime;
 727                 newest_slot = i;
 728         }
 729         if (newest_slot == -1)
 730                 return NULL;
 731         return slot[newest_slot].receiver_node->btrn;
 732 }
 733
 734 /* whether a new instance of a decoder should be started. */
 735 static bool must_start_decoder(void)
 736 {
 737         int cafn = stat_task->current_audio_format_num;
 738         unsigned vs = stat_task->vss_status;
 739
 740         if (audiod_status != AUDIOD_ON)
 741                 return false;
 742         if (cafn < 0)
 743                 return false;
 744         if (!stat_task->ct)
 745                 return false;
 746         if (vs & VSS_STATUS_FLAG_NEXT)
 747                 return false;
 748         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 749                 return false;
 750         if (receiver_running())
 751                 return false;
 752         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 753                 return false;
 754         return true;
 755 }
 756
 757 static void compute_time_diff(const struct timeval *status_time)
 758 {
 759         struct timeval tmp, diff;
 760         static unsigned count;
 761         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 762         const struct timeval max_deviation = {0, 500 * 1000};
 763         const int time_smooth = 5;
 764
 765         sign = tv_diff(status_time, now, &diff);
 766 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 767 //                      sign, sa_time_diff_sign);
 768         if (!count) {
 769                 sa_time_diff_sign = sign;
 770                 stat_task->sa_time_diff = diff;
 771                 count++;
 772                 goto out;
 773         }
 774         if (count > 5) {
 775                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 776                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 777                         PARA_WARNING_LOG("time diff jump: %lums\n",
 778                                 s * tv2ms(&tmp));
 779         }
 780         count++;
 781         sa_time_diff_sign = tv_convex_combination(
 782                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 783                 count > 10? sign : sign * time_smooth, &diff,
 784                 &tmp);
 785         stat_task->sa_time_diff = tmp;
 786         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 787                 sign < 0? "-" : "+",
 788                 tv2ms(&diff),
 789                 sa_time_diff_sign < 0? "-" : "+",
 790                 tv2ms(&stat_task->sa_time_diff)
 791         );
 792 out:
 793         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 794 }
 795
 796 static int update_item(int itemnum, char *buf)
 797 {
 798         long unsigned sec, usec;
 799
 800         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 801                 return 1;
 802         free(stat_item_values[itemnum]);
 803         stat_item_values[itemnum] = para_strdup(buf);
 804         stat_client_write_item(itemnum);
 805         switch (itemnum) {
 806         case SI_STATUS_FLAGS:
 807                 stat_task->vss_status = 0;
 808                 if (strchr(buf, 'N'))
 809                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 810                 if (strchr(buf, 'P'))
 811                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 812                 break;
 813         case SI_OFFSET:
 814                 stat_task->offset_seconds = atoi(buf);
 815                 break;
 816         case SI_SECONDS_TOTAL:
 817                 stat_task->length_seconds = atoi(buf);
 818                 break;
 819         case SI_STREAM_START:
 820                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 821                         stat_task->server_stream_start.tv_sec = sec;
 822                         stat_task->server_stream_start.tv_usec = usec;
 823                 }
 824                 break;
 825         case SI_CURRENT_TIME:
 826                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 827                         struct timeval tv = {sec, usec};
 828                         compute_time_diff(&tv);
 829                 }
 830                 break;
 831         case SI_FORMAT:
 832                 stat_task->current_audio_format_num
 833                         = get_audio_format_num(buf);
 834         }
 835         return 1;
 836 }
 837
 838 static int parse_stream_command(const char *txt, const char **cmd)
 839 {
 840         int ret, len;
 841         char *re, *p = strchr(txt, ':');
 842
 843         if (!p)
 844                 return -E_MISSING_COLON;
 845         *cmd = p + 1;
 846         len = p - txt;
 847         re = malloc(len + 1);
 848         strncpy(re, txt, len);
 849         re[len] = '\0';
 850         ret = get_matching_audio_format_nums(re);
 851         free(re);
 852         return ret;
 853 }
 854
 855 static int add_filter(int format, const char *cmdline)
 856 {
 857         struct audio_format_info *a = &afi[format];
 858         int filter_num, nf = a->num_filters;
 859         void *cfg;
 860         struct lls_parse_result *flpr;
 861
 862         filter_num = filter_setup(cmdline, &cfg, &flpr);
 863         a->filter_lpr = para_realloc(a->filter_lpr,
 864                 (nf + 1) * sizeof(flpr));
 865         a->filter_conf = para_realloc(a->filter_conf,
 866                 (nf + 1) * sizeof(void *));
 867         a->filter_nums = para_realloc(a->filter_nums,
 868                 (nf + 1) * sizeof(unsigned));
 869
 870         a->filter_nums[nf] = filter_num;
 871         a->filter_conf[nf] = cfg;
 872         a->filter_lpr[nf] = flpr;
 873         a->num_filters++;
 874         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 875                 filter_name(filter_num));
 876         return filter_num;
 877 }
 878
 879 static int parse_writer_args(void)
 880 {
 881         int i, ret;
 882         const char *cmd;
 883         struct audio_format_info *a;
 884
 885         for (i = 0; i < conf.writer_given; i++) {
 886                 void *wconf;
 887                 int j, nw, writer_num, af_mask;
 888
 889                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 890                 if (ret < 0)
 891                         return ret;
 892                 af_mask = ret;
 893                 FOR_EACH_AUDIO_FORMAT(j) {
 894                         a = afi + j;
 895                         if ((af_mask & (1 << j)) == 0) /* no match */
 896                                 continue;
 897                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 898                         nw = a->num_writers;
 899                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 900                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 901                         a->writer_nums[nw] = writer_num;
 902                         a->writer_conf[nw] = wconf;
 903                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 904                                 nw, writer_names[writer_num]);
 905                         a->num_writers++;
 906                 }
 907         }
 908         /* Use default writer for audio formats which are not yet set up. */
 909         FOR_EACH_AUDIO_FORMAT(i) {
 910                 void *writer_conf;
 911                 int writer_num;
 912                 a = afi + i;
 913                 if (a->num_writers > 0)
 914                         continue; /* already set up */
 915                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 916                 a->writer_nums = para_malloc(sizeof(int));
 917                 a->writer_nums[0] = writer_num;
 918                 a->writer_conf = para_malloc(sizeof(void *));
 919                 a->writer_conf[0] = writer_conf;
 920                 a->num_writers = 1;
 921                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 922                         writer_names[writer_num]);
 923         }
 924         return 1;
 925 }
 926
 927 static int parse_receiver_args(void)
 928 {
 929         int i, ret;
 930         const char *arg;
 931         struct audio_format_info *a;
 932
 933         FOR_EACH_AUDIO_FORMAT(i)
 934                 afi[i].receiver_num = -1;
 935         for (i = conf.receiver_given - 1; i >= 0; i--) {
 936                 int j, af_mask;
 937
 938                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 939                 if (ret < 0)
 940                         goto out;
 941                 af_mask = ret;
 942                 FOR_EACH_AUDIO_FORMAT(j) {
 943                         a = afi + j;
 944                         if ((af_mask & (1 << j)) == 0) /* no match */
 945                                 continue;
 946                         /*
 947                          * If multiple receivers are given for this audio format, the
 948                          * last one wins and we have to free the previous receiver
 949                          * config here. Since we are iterating backwards, the winning
 950                          * receiver arg is in fact the first one given.
 951                          */
 952                         lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
 953                         a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
 954                 }
 955         }
 956         /*
 957          * Use the default receiver for those audio formats for which no
 958          * receiver was specified.
 959          */
 960         FOR_EACH_AUDIO_FORMAT(i) {
 961                 a = afi + i;
 962                 if (a->receiver_num >= 0)
 963                         continue;
 964                 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
 965         }
 966         FOR_EACH_AUDIO_FORMAT(i) {
 967                 a = afi + i;
 968                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 969                         audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
 970         }
 971         ret = 1;
 972 out:
 973         return ret;
 974 }
 975
 976 static int init_default_filters(void)
 977 {
 978         int i, ret = 1;
 979
 980         FOR_EACH_AUDIO_FORMAT(i) {
 981                 struct audio_format_info *a = &afi[i];
 982                 const char *name = lls_command_name(RECEIVER_CMD(a));
 983                 char *tmp;
 984                 int j;
 985
 986                 if (a->num_filters)
 987                         continue; /* no default -- nothing to to */
 988                 /*
 989                  * udp and dccp streams are fec-encoded, so add fecdec as the
 990                  * first filter.
 991                  */
 992                 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
 993                         tmp = para_strdup("fecdec");
 994                         add_filter(i, tmp);
 995                         free(tmp);
 996                         if (ret < 0)
 997                                 goto out;
 998                 }
 999                 /* add "dec" to audio format name */
1000                 tmp = make_message("%sdec", audio_formats[i]);
1001                 for (j = 0; filter_get(j); j++)
1002                         if (!strcmp(tmp, filter_name(j)))
1003                                 break;
1004                 free(tmp);
1005                 ret = -E_UNSUPPORTED_FILTER;
1006                 if (!filter_get(j))
1007                         goto out;
1008                 tmp = para_strdup(filter_name(j));
1009                 ret = add_filter(i, tmp);
1010                 free(tmp);
1011                 if (ret < 0)
1012                         goto out;
1013                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1014                         filter_name(j));
1015         }
1016 out:
1017         return ret;
1018 }
1019
1020 static int parse_filter_args(void)
1021 {
1022         int i, j, ret, af_mask, num_matches;
1023
1024         for (i = 0; i < conf.filter_given; i++) {
1025                 const char *arg;
1026                 ret = parse_stream_command(conf.filter_arg[i], &arg);
1027                 if (ret < 0)
1028                         goto out;
1029                 af_mask = ret;
1030                 num_matches = 0;
1031                 FOR_EACH_AUDIO_FORMAT(j) {
1032                         if ((af_mask & (1 << j)) == 0) /* no match */
1033                                 continue;
1034                         ret = add_filter(j, arg);
1035                         if (ret < 0)
1036                                 goto out;
1037                         num_matches++;
1038                 }
1039                 if (num_matches == 0)
1040                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
1041                                 conf.filter_arg[i]);
1042         }
1043         ret = init_default_filters(); /* use default values for the rest */
1044 out:
1045         return ret;
1046 }
1047
1048 static int parse_stream_args(void)
1049 {
1050         int ret;
1051
1052         ret = parse_receiver_args();
1053         if (ret < 0)
1054                 return ret;
1055         ret = parse_filter_args();
1056         if (ret < 0)
1057                 return ret;
1058         ret = parse_writer_args();
1059         if (ret < 0)
1060                 return ret;
1061         return 1;
1062 }
1063
1064 /* does not unlink socket on errors */
1065 static void init_local_sockets(struct command_task *ct)
1066 {
1067         if (conf.socket_given)
1068                 socket_name = para_strdup(conf.socket_arg);
1069         else {
1070                 char *hn = para_hostname();
1071                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1072                         hn);
1073                 free(hn);
1074         }
1075         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1076         if (conf.force_given)
1077                 unlink(socket_name);
1078         ct->fd[0] = create_local_socket(socket_name, 0);
1079         ct->fd[1] = create_local_socket(socket_name,
1080                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1081         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1082                 return;
1083         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1084         exit(EXIT_FAILURE);
1085 }
1086
1087 static int signal_post_select(struct sched *s, void *context)
1088 {
1089         struct signal_task *st = context;
1090         int ret, signum;
1091
1092         ret = task_get_notification(st->task);
1093         if (ret < 0)
1094                 return ret;
1095         signum = para_next_signal(&s->rfds);
1096         switch (signum) {
1097         case SIGINT:
1098         case SIGTERM:
1099         case SIGHUP:
1100                 PARA_NOTICE_LOG("received signal %d\n", signum);
1101                 task_notify_all(s, E_AUDIOD_SIGNAL);
1102                 return -E_AUDIOD_SIGNAL;
1103         }
1104         return 0;
1105 }
1106
1107 static void command_pre_select(struct sched *s, void *context)
1108 {
1109         struct command_task *ct = context;
1110         int i;
1111
1112         for (i = 0; i < 2; i++)
1113                 if (ct->fd[i] >= 0)
1114                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1115 }
1116
1117 static int command_post_select(struct sched *s, void *context)
1118 {
1119         int ret, i;
1120         struct command_task *ct = context;
1121         static struct timeval last_status_dump;
1122         struct timeval tmp, delay;
1123         bool force = false;
1124
1125         ret = task_get_notification(ct->task);
1126         if (ret < 0)
1127                 return ret;
1128         for (i = 0; i < 2; i++) {
1129                 if (ct->fd[i] < 0)
1130                         continue;
1131                 ret = handle_connect(ct->fd[i], &s->rfds);
1132                 if (ret < 0) {
1133                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1134                         if (ret == -E_AUDIOD_TERM) {
1135                                 task_notify_all(s, -ret);
1136                                 return ret;
1137                         }
1138                 } else if (ret > 0)
1139                         force = true;
1140         }
1141         if (force == true)
1142                 goto dump;
1143
1144         /* if last status dump was less than 500ms ago, do nothing */
1145         delay.tv_sec = 0;
1146         delay.tv_usec = 500 * 1000;
1147         tv_add(&last_status_dump, &delay, &tmp);
1148         if (tv_diff(now, &tmp, NULL) < 0)
1149                 return 0;
1150
1151         /*
1152          * If last status dump was more than 5s ago, force update. Otherwise,
1153          * update only those items that have changed.
1154          */
1155         delay.tv_sec = 5;
1156         delay.tv_usec = 0;
1157         tv_add(&last_status_dump, &delay, &tmp);
1158         if (tv_diff(now, &tmp, NULL) > 0)
1159                 force = true;
1160 dump:
1161         audiod_status_dump(force);
1162         last_status_dump = *now;
1163         return 1;
1164 }
1165
1166 static void init_command_task(struct command_task *ct)
1167 {
1168         init_local_sockets(ct); /* doesn't return on errors */
1169
1170         ct->task = task_register(&(struct task_info) {
1171                 .name = "command",
1172                 .pre_select = command_pre_select,
1173                 .post_select = command_post_select,
1174                 .context = ct,
1175         }, &sched);
1176 }
1177
1178 static void close_stat_pipe(void)
1179 {
1180         if (!stat_task->ct)
1181                 return;
1182         task_reap(&stat_task->ct->task);
1183         client_close(stat_task->ct);
1184         stat_task->ct = NULL;
1185         clear_and_dump_items();
1186         stat_task->length_seconds = 0;
1187         stat_task->offset_seconds = 0;
1188         stat_task->vss_status = 0;
1189         stat_task->current_audio_format_num = -1;
1190         audiod_status_dump(true);
1191 }
1192
1193 /* avoid busy loop if server is down */
1194 static void set_stat_task_restart_barrier(unsigned seconds)
1195 {
1196         struct timeval delay = {seconds, 0};
1197         tv_add(now, &delay, &stat_task->restart_barrier);
1198 }
1199
1200 static bool must_close_slot(int slot_num)
1201 {
1202         struct slot_info *s = &slot[slot_num];
1203         struct audio_format_info *a = afi + s->format;
1204         int i;
1205
1206         if (s->format < 0)
1207                 return false;
1208         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1209                 return false;
1210         for (i = 0; i < a->num_filters; i++)
1211                 if (s->fns && task_status(s->fns[i].task) >= 0)
1212                         return false;
1213         if (a->num_writers > 0) {
1214                 for (i = 0; i < a->num_writers; i++)
1215                         if (s->wns && task_status(s->wns[i].task) >= 0)
1216                                 return false;
1217         } else {
1218                 if (s->wns && task_status(s->wns[0].task) >= 0)
1219                         return false;
1220         }
1221         return true;
1222 }
1223
1224 static void close_slot(int slot_num)
1225 {
1226         struct slot_info *s = slot + slot_num;
1227
1228         PARA_INFO_LOG("closing slot %d\n", slot_num);
1229         close_writers(s);
1230         close_filters(s);
1231         close_receiver(slot_num);
1232         clear_slot(slot_num);
1233 }
1234
1235 static void close_unused_slots(void)
1236 {
1237         int i;
1238         bool dump = false;
1239
1240         FOR_EACH_SLOT(i)
1241                 if (must_close_slot(i)) {
1242                         close_slot(i);
1243                         dump = true;
1244                 }
1245         if (dump)
1246                 audiod_status_dump(true);
1247 }
1248
1249 /*
1250  * Cleanup all resources.
1251  *
1252  * This performs various cleanups, removes the audiod socket and closes the
1253  * connection to para_server.
1254  */
1255 static void audiod_cleanup(void)
1256 {
1257         if (socket_name)
1258                 unlink(socket_name);
1259         close_stat_pipe();
1260         close_unused_slots();
1261         audiod_cmdline_parser_free(&conf);
1262         close_stat_clients();
1263         free(uid_whitelist);
1264 }
1265
1266 /*
1267  * Check if any receivers/filters/writers need to be started and do so if
1268  * necessary.
1269  */
1270 static void start_stop_decoders(void)
1271 {
1272         int ret;
1273         struct slot_info *sl;
1274
1275         close_unused_slots();
1276         if (audiod_status != AUDIOD_ON ||
1277                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1278                 return notify_receivers(E_NOT_PLAYING);
1279         if (!must_start_decoder())
1280                 return;
1281         ret = open_receiver(stat_task->current_audio_format_num);
1282         if (ret < 0) {
1283                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1284                 return;
1285         }
1286         sl = slot + ret;
1287         open_filters(sl);
1288         open_writers(sl);
1289         activate_grab_clients(&sched);
1290         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1291         audiod_status_dump(true);
1292 }
1293
1294 static void status_pre_select(struct sched *s, void *context)
1295 {
1296         struct status_task *st = context;
1297         int i, ret, cafn = stat_task->current_audio_format_num;
1298
1299         if (must_start_decoder())
1300                 goto min_delay;
1301         FOR_EACH_SLOT(i)
1302                 if (must_close_slot(i))
1303                         goto min_delay;
1304         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1305         if (ret > 0)
1306                 goto min_delay;
1307         if (st->ct && audiod_status == AUDIOD_OFF)
1308                 goto min_delay;
1309         if (!st->ct && audiod_status != AUDIOD_OFF)
1310                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1311         if (cafn >= 0)
1312                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1313         /*
1314          * If para_server is playing we'd like to have a smooth time display
1315          * even if we are running in standby mode. So we request a timeout that
1316          * expires at the next full second.
1317          */
1318         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1319                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1320         return;
1321 min_delay:
1322         sched_min_delay(s);
1323 }
1324
1325 /* restart the client task if necessary */
1326 static int status_post_select(struct sched *s, void *context)
1327 {
1328         struct status_task *st = context;
1329         int ret;
1330
1331         ret = task_get_notification(st->task);
1332         if (ret < 0)
1333                 return ret;
1334         if (audiod_status == AUDIOD_OFF) {
1335                 if (!st->ct)
1336                         goto out;
1337                 if (task_status(st->ct->task) >= 0) {
1338                         task_notify(st->ct->task, E_AUDIOD_OFF);
1339                         goto out;
1340                 }
1341                 close_stat_pipe();
1342                 st->clock_diff_count = conf.clock_diff_count_arg;
1343                 goto out;
1344         }
1345         if (st->ct) {
1346                 char *buf;
1347                 size_t sz;
1348
1349                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1350                 if (ret < 0) {
1351                         close_stat_pipe();
1352                         goto out;
1353                 }
1354                 if (st->ct->status != CL_EXECUTING)
1355                         goto out;
1356                 if (ret == 0) {
1357                         struct timeval diff;
1358                         tv_diff(now, &st->last_status_read, &diff);
1359                         if (diff.tv_sec > 61)
1360                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1361                         goto out;
1362                 }
1363                 btr_merge(st->btrn, st->min_iqs);
1364                 sz = btr_next_buffer(st->btrn, &buf);
1365                 ret = for_each_stat_item(buf, sz, update_item);
1366                 if (ret < 0) {
1367                         task_notify(st->ct->task, -ret);
1368                         goto out;
1369                 }
1370                 if (sz != ret) {
1371                         btr_consume(st->btrn, sz - ret);
1372                         st->last_status_read = *now;
1373                         st->min_iqs = 0;
1374                 } else /* current status item crosses buffers */
1375                         st->min_iqs = sz + 1;
1376                 goto out;
1377         }
1378         btr_drain(st->btrn);
1379         st->current_audio_format_num = -1;
1380         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1381                 goto out;
1382         if (st->clock_diff_count) { /* get status only one time */
1383                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1384                 int argc = 5;
1385                 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1386                 st->clock_diff_count--;
1387                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1388                 set_stat_task_restart_barrier(2);
1389
1390         } else {
1391                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1392                 int argc = 4;
1393                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1394                 set_stat_task_restart_barrier(5);
1395         }
1396         free(stat_item_values[SI_BASENAME]);
1397         stat_item_values[SI_BASENAME] = para_strdup(
1398                 "no connection to para_server");
1399         stat_client_write_item(SI_BASENAME);
1400         st->last_status_read = *now;
1401 out:
1402         start_stop_decoders();
1403         return 0;
1404 }
1405
1406 static void init_status_task(struct status_task *st)
1407 {
1408         memset(st, 0, sizeof(struct status_task));
1409         st->sa_time_diff_sign = 1;
1410         st->clock_diff_count = conf.clock_diff_count_arg;
1411         st->current_audio_format_num = -1;
1412         st->btrn = btr_new_node(&(struct btr_node_description)
1413                 EMBRACE(.name = "stat"));
1414
1415         stat_task->task = task_register(&(struct task_info) {
1416                 .name = "stat",
1417                 .pre_select = status_pre_select,
1418                 .post_select = status_post_select,
1419                 .context = stat_task,
1420         }, &sched);
1421 }
1422
1423 static void set_initial_status(void)
1424 {
1425         audiod_status = AUDIOD_ON;
1426         if (!conf.mode_given)
1427                 return;
1428         if (!strcmp(conf.mode_arg, "sb")) {
1429                 audiod_status = AUDIOD_STANDBY;
1430                 return;
1431         }
1432         if (!strcmp(conf.mode_arg, "off")) {
1433                 audiod_status = AUDIOD_OFF;
1434                 return;
1435         }
1436         if (strcmp(conf.mode_arg, "on"))
1437                 PARA_WARNING_LOG("invalid mode\n");
1438 }
1439
1440 __noreturn static void print_help_and_die(void)
1441 {
1442         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1443         bool d = conf.detailed_help_given;
1444         unsigned flags;
1445
1446         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1447         ggo_print_help(&h, flags);
1448
1449         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1450         print_receiver_helps(flags);
1451         print_filter_helps(flags);
1452         print_writer_helps(flags);
1453         exit(0);
1454 }
1455
1456 /**
1457  * Lookup the given UID in the whitelist.
1458  *
1459  * The whitelist is the array of arguments to the --user-allow opion. If the
1460  * option was not given, the array is empty, in which case the check succeeds.
1461  *
1462  * \param uid User ID to look up.
1463  *
1464  * \return True if --user-allow was not given, or if uid matches an element of
1465  * the whitelist.
1466  */
1467 bool uid_is_whitelisted(uid_t uid)
1468 {
1469         int i;
1470
1471         if (!conf.user_allow_given)
1472                 return true;
1473         for (i = 0; i < conf.user_allow_given; i++)
1474                 if (uid == uid_whitelist[i])
1475                         return true;
1476         return false;
1477 }
1478
1479 /**
1480  * the main function of para_audiod
1481  *
1482  * \param argc usual argument count
1483  * \param argv usual argument vector
1484  *
1485  * \return EXIT_SUCCESS or EXIT_FAILURE
1486  *
1487  * \sa para_audiod(1)
1488  * */
1489 int main(int argc, char *argv[])
1490 {
1491         int ret, i;
1492         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1493         struct audiod_cmdline_parser_params params = {
1494                 .override = 0,
1495                 .initialize = 1,
1496                 .check_required = 0,
1497                 .check_ambiguity = 0,
1498                 .print_errors = 1
1499         };
1500
1501         valid_fd_012();
1502         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1503         daemon_set_loglevel(conf.loglevel_arg);
1504         version_handle_flag("audiod", conf.version_given);
1505         /* init receivers/filters/writers early to make help work */
1506         recv_init();
1507         writer_init();
1508         if (conf.help_given || conf.detailed_help_given)
1509                 print_help_and_die();
1510         daemon_set_priority(conf.priority_arg);
1511         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1512         parse_config_or_die();
1513         if (daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1514                 conf.logfile_given)) {
1515                         for (i = 0; i < conf.log_color_given; i++)
1516                                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1517         }
1518         init_random_seed_or_die();
1519         daemon_set_flag(DF_LOG_TIME);
1520         daemon_set_flag(DF_LOG_HOSTNAME);
1521         daemon_set_flag(DF_LOG_LL);
1522         if (conf.log_timing_given)
1523                 daemon_set_flag(DF_LOG_TIMING);
1524         if (conf.logfile_given) {
1525                 daemon_set_logfile(conf.logfile_arg);
1526                 daemon_open_log_or_die();
1527         }
1528         ret = parse_stream_args();
1529         if (ret < 0) {
1530                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1531                 exit(EXIT_FAILURE);
1532         }
1533         daemon_log_welcome("audiod");
1534         daemon_set_start_time();
1535         set_initial_status();
1536         FOR_EACH_SLOT(i)
1537                 clear_slot(i);
1538         setup_signal_handling();
1539
1540         init_status_task(stat_task);
1541         init_command_task(cmd_task);
1542
1543         if (conf.daemon_given)
1544                 daemonize(false /* parent exits immediately */);
1545
1546         signal_task->task = task_register(&(struct task_info) {
1547                 .name = "signal",
1548                 .pre_select = signal_pre_select,
1549                 .post_select = signal_post_select,
1550                 .context = signal_task,
1551         }, &sched);
1552
1553         sched.default_timeout.tv_sec = 2;
1554         sched.default_timeout.tv_usec = 999 * 1000;
1555         ret = schedule(&sched);
1556         audiod_cleanup();
1557         sched_shutdown(&sched);
1558         signal_shutdown(signal_task);
1559
1560         if (ret < 0)
1561                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1562         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1563 }