audiod.c

   1 /*
   2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c the paraslash's audio daemon */
   8 #include <regex.h>
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11 #include <signal.h>
  12 #include <openssl/rc4.h>
  13 #include <stdbool.h>
  14
  15 #include "para.h"
  16 #include "error.h"
  17 #include "crypt.h"
  18 #include "audiod.cmdline.h"
  19 #include "list.h"
  20 #include "sched.h"
  21 #include "ggo.h"
  22 #include "recv.h"
  23 #include "buffer_tree.h"
  24 #include "filter.h"
  25 #include "grab_client.h"
  26 #include "client.cmdline.h"
  27 #include "client.h"
  28 #include "audiod.h"
  29 #include "net.h"
  30 #include "daemon.h"
  31 #include "string.h"
  32 #include "fd.h"
  33 #include "write.h"
  34 #include "write_common.h"
  35 #include "signal.h"
  36
  37 /** define the array of error lists needed by para_audiod */
  38 INIT_AUDIOD_ERRLISTS;
  39 /** define the array containing all supported audio formats */
  40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  41
  42 /** Defines how audiod handles one supported audio format. */
  43 struct audio_format_info {
  44         /** pointer to the receiver for this audio format */
  45         struct receiver *receiver;
  46         /** the receiver configuration */
  47         void *receiver_conf;
  48         /** the number of filters that should be activated for this audio format */
  49         unsigned int num_filters;
  50         /** Array of filter numbers to be activated. */
  51         unsigned *filter_nums;
  52         /** Pointer to the array of filter configurations. */
  53         void **filter_conf;
  54         /** the number of filters that should be activated for this audio format */
  55         unsigned int num_writers;
  56         /** Array of writer numbers to be activated. */
  57         int *writer_nums;
  58         /** pointer to the array of writer configurations */
  59         void **writer_conf;
  60         /** do not start receiver/filters/writer before this time */
  61         struct timeval restart_barrier;
  62 };
  63
  64 /**
  65  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  66  * be associated with a receiver/filter/writer triple. This array holds all
  67  * information on the status of these slots.
  68  *
  69  * \sa struct slot_info
  70  * */
  71 struct slot_info slot[MAX_STREAM_SLOTS];
  72
  73 /** The vss status flags audiod is interested in. */
  74 enum vss_status_flags {
  75         /** Whether the 'N' flag is set. */
  76         VSS_STATUS_FLAG_NEXT = 1,
  77         /** The 'P' flag is set. */
  78         VSS_STATUS_FLAG_PLAYING = 2,
  79 };
  80
  81 /**
  82  * The task for obtaining para_server's status (para_client stat).
  83  *
  84  * \sa struct task, struct sched.
  85  */
  86 struct status_task {
  87         /** The associated task structure of audiod. */
  88         struct task task;
  89         /** Client data associated with the stat task. */
  90         struct client_task *ct;
  91         /** Do not restart client command until this time. */
  92         struct timeval restart_barrier;
  93         /** Last time we received status data from para_server. */
  94         struct timeval last_status_read;
  95         /** The offset value announced by para_server. */
  96         int offset_seconds;
  97         /** The length of the current audio file as announced by para_server. */
  98         int length_seconds;
  99         /** The start of the current stream from the view of para_server. */
 100         struct timeval server_stream_start;
 101         /** The average time deviation between para_server and para_audiod. */
 102         struct timeval sa_time_diff;
 103         /** Whether client time is ahead of server time. */
 104         int sa_time_diff_sign;
 105         /** The 'P' and the 'N' flags as announced by para_server. */
 106         enum vss_status_flags vss_status;
 107         /** Number of times the clock difference is to be checked. */
 108         unsigned clock_diff_count;
 109         /** When to start the next check for clock difference. */
 110         struct timeval clock_diff_barrier;
 111         /** Number of the audio format as announced by para_server. */
 112         int current_audio_format_num;
 113         /* The status task btrn is the child of the client task. */
 114         struct btr_node *btrn;
 115 };
 116
 117 /** The array of status items sent by para_server. */
 118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 119
 120 /**
 121  * the current mode of operation of which can be changed by the on/off/cycle
 122  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 123  */
 124 int audiod_status = AUDIOD_ON;
 125
 126 /**
 127  * the gengetopt args_info struct that holds information on all command line
 128  * arguments
 129  */
 130 struct audiod_args_info conf;
 131
 132 static char *socket_name;
 133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 134
 135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 136
 137 static struct status_task status_task_struct;
 138
 139 /**
 140  * the task that calls the status command of para_server
 141  *
 142  * \sa struct status_task
 143  */
 144 static struct status_task *stat_task = &status_task_struct;
 145 static struct timeval initial_delay_barrier;
 146
 147 /**
 148  * the task for handling audiod commands
 149  *
 150  * \sa struct task, struct sched
 151  */
 152 struct command_task {
 153         /** the local listening socket */
 154         int fd;
 155         /** the associated task structure */
 156         struct task task;
 157 };
 158
 159 /** iterate over all supported audio formats */
 160 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 161
 162 /**
 163  * get the audio format number
 164  * \param name the name of the audio format
 165  *
 166  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 167  * \a name is not a supported audio format.
 168  */
 169 int get_audio_format_num(const char *name)
 170 {
 171         int i;
 172
 173         while (para_isspace(*name))
 174                 name++;
 175         FOR_EACH_AUDIO_FORMAT(i)
 176                 if (!strcmp(name, audio_formats[i]))
 177                         return i;
 178         return -E_UNSUPPORTED_AUDIO_FORMAT;
 179 }
 180
 181 char *get_time_string(int slot_num)
 182 {
 183         int ret, seconds = 0, length;
 184         struct timeval *tmp, sum, sss, /* server stream start */
 185                 rstime, /* receiver start time */
 186                 wstime, /* writer start time */
 187                 wtime, /* now - writer start */
 188                 rskip; /* receiver start - sss */
 189         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 190         char *msg;
 191
 192         if (audiod_status == AUDIOD_OFF)
 193                 goto empty;
 194         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 195                 if (stat_task->length_seconds) /* paused */
 196                         return NULL;
 197                 goto empty; /* stopped */
 198         }
 199         if (audiod_status == AUDIOD_ON && !s)
 200                 goto empty;
 201         /*
 202          * Valid status items and playing, set length and tmp to the stream
 203          * start. We use the slot info and fall back to the info from current
 204          * status items if no slot info is available.
 205          */
 206         length = stat_task->length_seconds;
 207         tmp = &stat_task->server_stream_start;
 208         if (s && s->wns) { /* writer active in this slot */
 209                 btr_get_node_start(s->wns[0].btrn, &wstime);
 210                 if (wstime.tv_sec != 0) { /* writer wrote something */
 211                         if (s->server_stream_start.tv_sec == 0) {
 212                                 /* copy status info to slot */
 213                                 s->server_stream_start = stat_task->server_stream_start;
 214                                 s->offset_seconds = stat_task->offset_seconds;
 215                                 s->seconds_total = stat_task->length_seconds;
 216                         }
 217                         length = s->seconds_total;
 218                         tmp = &s->server_stream_start;
 219                 }
 220         }
 221         if (stat_task->sa_time_diff_sign > 0)
 222                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 223         else
 224                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 225         if (!s || !s->wns) {
 226                 struct timeval diff;
 227                 tv_diff(now, &sss, &diff);
 228                 seconds = diff.tv_sec + stat_task->offset_seconds;
 229                 goto out;
 230         }
 231         tv_diff(now, &wstime, &wtime);
 232         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 233         seconds = s->offset_seconds;
 234         btr_get_node_start(s->receiver_node->btrn, &rstime);
 235         ret = tv_diff(&rstime, &sss, &rskip);
 236         if (ret > 0) { /* audiod was started in the middle of the stream */
 237                 tv_add(&wtime, &rskip, &sum);
 238                 seconds += sum.tv_sec;
 239         } else
 240                 seconds += wtime.tv_sec;
 241 out:
 242         seconds = PARA_MIN(seconds, length);
 243         seconds = PARA_MAX(seconds, 0);
 244         msg = make_message(
 245                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 246                 s? "" : "~",
 247                 seconds / 60,
 248                 seconds % 60,
 249                 (length - seconds) / 60,
 250                 (length - seconds) % 60,
 251                 length? (seconds * 100 + length / 2) / length : 0,
 252                 length / 60,
 253                 length % 60
 254         );
 255         PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 256         return msg;
 257 empty:
 258         return para_strdup(NULL);
 259 }
 260
 261 static int want_colors(void)
 262 {
 263         if (conf.color_arg == color_arg_no)
 264                 return 0;
 265         if (conf.color_arg == color_arg_yes)
 266                 return 1;
 267         if (conf.logfile_given)
 268                 return 0;
 269         return isatty(STDERR_FILENO);
 270 }
 271
 272 static void parse_config_or_die(void)
 273 {
 274         int ret;
 275         char *config_file;
 276         struct audiod_cmdline_parser_params params = {
 277                 .override = 0,
 278                 .initialize = 0,
 279                 .check_required = 1,
 280                 .check_ambiguity = 0,
 281                 .print_errors = 1
 282         };
 283
 284         if (conf.config_file_given)
 285                 config_file = para_strdup(conf.config_file_arg);
 286         else {
 287                 char *home = para_homedir();
 288                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 289                 free(home);
 290         }
 291         ret = file_exists(config_file);
 292         if (conf.config_file_given && !ret) {
 293                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 294                 goto err;
 295         }
 296         if (ret)
 297                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 298         free(config_file);
 299         daemon_set_loglevel(conf.loglevel_arg);
 300         return;
 301 err:
 302         free(config_file);
 303         exit(EXIT_FAILURE);
 304 }
 305
 306 static void setup_signal_handling(void)
 307 {
 308         sig_task->fd = para_signal_init();
 309         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 310         para_install_sighandler(SIGINT);
 311         para_install_sighandler(SIGTERM);
 312         para_install_sighandler(SIGHUP);
 313         para_sigaction(SIGPIPE, SIG_IGN);
 314 }
 315
 316 static void clear_slot(int slot_num)
 317 {
 318         struct slot_info *s = &slot[slot_num];
 319
 320         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 321         memset(s, 0, sizeof(struct slot_info));
 322         s->format = -1;
 323 }
 324
 325 static void close_receiver(int slot_num)
 326 {
 327         struct slot_info *s = &slot[slot_num];
 328         struct audio_format_info *a;
 329         struct timeval restart_delay = {0, 200 * 1000};
 330
 331         if (s->format < 0 || !s->receiver_node)
 332                 return;
 333         a = &afi[s->format];
 334         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 335                 audio_formats[s->format], slot_num);
 336         a->receiver->close(s->receiver_node);
 337         btr_free_node(s->receiver_node->btrn);
 338         free(s->receiver_node);
 339         s->receiver_node = NULL;
 340         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 341 }
 342
 343 static void writer_cleanup(struct writer_node *wn)
 344 {
 345         struct writer *w;
 346
 347         if (!wn)
 348                 return;
 349         w = writers + wn->writer_num;
 350         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 351         w->close(wn);
 352         btr_free_node(wn->btrn);
 353 }
 354
 355 static void close_writers(struct slot_info *s)
 356 {
 357         struct audio_format_info *a;
 358         int i;
 359
 360         if (s->format < 0)
 361                 return;
 362         assert(s->wns);
 363         a = afi + s->format;
 364         if (a->num_writers == 0)
 365                 writer_cleanup(s->wns);
 366         else {
 367                 for (i = 0; i < a->num_writers; i++)
 368                         writer_cleanup(s->wns + i);
 369         }
 370         free(s->wns);
 371         s->wns = NULL;
 372 }
 373
 374 static void close_filters(struct slot_info *s)
 375 {
 376         int i;
 377         struct audio_format_info *a = afi + s->format;
 378         if (a->num_filters == 0)
 379                 return;
 380         for (i = 0; i < a->num_filters; i++) {
 381                 struct filter_node *fn = s->fns + i;
 382                 struct filter *f;
 383
 384                 if (!fn)
 385                         continue;
 386                 f = filters + fn->filter_num;
 387                 if (f->close)
 388                         f->close(fn);
 389                 btr_free_node(fn->btrn);
 390         }
 391         free(s->fns);
 392         s->fns = NULL;
 393 }
 394
 395 /*
 396  * Whenever a task commits suicide by returning from post_select with t->error
 397  * < 0, it also removes its btr node. We do exactly that to kill a running
 398  * task. Note that the scheduler checks t->error also _before_ each pre/post
 399  * select call, so the victim will never be scheduled again.
 400  */
 401 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
 402 {
 403         if (t->error < 0)
 404                 return;
 405         t->error = error;
 406         btr_remove_node(btrn);
 407 }
 408
 409 static void kill_all_decoders(int error)
 410 {
 411         int i, j;
 412
 413         FOR_EACH_SLOT(i) {
 414                 struct slot_info *s = &slot[i];
 415                 struct audio_format_info *a;
 416                 if (s->format < 0)
 417                         continue;
 418                 a = afi + s->format;
 419                 if (s->wns)
 420                         for (j = 0; j < a->num_writers; j++)
 421                                 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
 422                 if (s->fns)
 423                         for (j = 0; j < a->num_writers; j++)
 424                                 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
 425                 if (s->receiver_node)
 426                         kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
 427                                 error);
 428         }
 429 }
 430
 431 static int get_empty_slot(void)
 432 {
 433         int i;
 434         struct slot_info *s;
 435
 436         FOR_EACH_SLOT(i) {
 437                 s = &slot[i];
 438                 if (s->format < 0) {
 439                         clear_slot(i);
 440                         return i;
 441                 }
 442                 if (s->wns || s->receiver_node || s->fns)
 443                         continue;
 444                 clear_slot(i);
 445                 return i;
 446         }
 447         return -E_NO_MORE_SLOTS;
 448 }
 449
 450 /**
 451  * get the number of filters
 452  *
 453  * \param audio_format_num the number identifying the audio format
 454  *
 455  * \return the number of filters for the given audio format
 456  *
 457  * \sa struct filter;
 458  */
 459 int num_filters(int audio_format_num)
 460 {
 461         return afi[audio_format_num].num_filters;
 462 }
 463
 464 static void open_filters(struct slot_info *s)
 465 {
 466         struct audio_format_info *a = afi + s->format;
 467         struct filter_node *fn;
 468         int nf = a->num_filters;
 469         struct btr_node *parent;
 470         int i;
 471
 472         if (nf == 0)
 473                 return;
 474         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 475         assert(s->fns == NULL);
 476         s->fns = para_calloc(nf * sizeof(struct filter_node));
 477         parent = s->receiver_node->btrn;
 478         for (i = 0; i < nf; i++) {
 479                 struct filter *f = filters + a->filter_nums[i];
 480                 fn = s->fns + i;
 481                 fn->filter_num = a->filter_nums[i];
 482                 fn->conf = a->filter_conf[i];
 483                 fn->task.pre_select = f->pre_select;
 484                 fn->task.post_select = f->post_select;
 485
 486                 fn->btrn = btr_new_node(&(struct btr_node_description)
 487                         EMBRACE(.name = f->name, .parent = parent,
 488                                 .handler = f->execute, .context = fn));
 489
 490                 f->open(fn);
 491                 register_task(&fn->task);
 492                 parent = fn->btrn;
 493                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 494                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 495                 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
 496         }
 497 }
 498
 499 static void open_writers(struct slot_info *s)
 500 {
 501         int i;
 502         struct audio_format_info *a = afi + s->format;
 503         struct writer_node *wn;
 504         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 505
 506         assert(s->wns == NULL);
 507         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 508                 * sizeof(struct writer_node));
 509         if (a->num_writers == 0)
 510                 setup_writer_node(NULL, parent, s->wns);
 511         else {
 512                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 513                 for (i = 0; i < a->num_writers; i++) {
 514                         wn = s->wns + i;
 515                         wn->conf = a->writer_conf[i];
 516                         wn->writer_num = a->writer_nums[i];
 517                         register_writer_node(wn, parent);
 518                 }
 519         }
 520 }
 521
 522 /* returns slot num on success */
 523 static int open_receiver(int format)
 524 {
 525         struct audio_format_info *a = &afi[format];
 526         struct slot_info *s;
 527         int ret, slot_num;
 528         struct receiver *r = a->receiver;
 529         struct receiver_node *rn;
 530         const struct timeval restart_delay = {2, 0};
 531
 532         ret = get_empty_slot();
 533         if (ret < 0)
 534                 goto err;
 535         slot_num = ret;
 536         s = &slot[slot_num];
 537         s->format = format;
 538         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 539         rn = s->receiver_node;
 540         rn->receiver = r;
 541         rn->conf = a->receiver_conf;
 542         rn->btrn = btr_new_node(&(struct btr_node_description)
 543                 EMBRACE(.name = r->name, .context = rn));
 544         ret = r->open(rn);
 545         if (ret < 0) {
 546                 btr_free_node(rn->btrn);
 547                 free(rn);
 548                 s->receiver_node = NULL;
 549                 goto err;
 550         }
 551         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 552                 audio_formats[s->format], r->name, slot_num);
 553         rn->task.pre_select = r->pre_select;
 554         rn->task.post_select = r->post_select;
 555         sprintf(rn->task.status, "%s receiver node", r->name);
 556         register_task(&rn->task);
 557         ret = slot_num;
 558 err:
 559         if (ret < 0)
 560                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 561         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 562         return ret;
 563 }
 564
 565 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 566 static int receiver_running(int format)
 567 {
 568         int i, ret = 0;
 569
 570         FOR_EACH_SLOT(i) {
 571                 struct slot_info *s = &slot[i];
 572                 if (s->format != format)
 573                         continue;
 574                 if (!s->receiver_node)
 575                         continue;
 576                 if (s->receiver_node->task.error >= 0)
 577                         return 1;
 578                 ret = -1;
 579         }
 580         return ret;
 581 }
 582
 583 struct btr_node *audiod_get_btr_root(void)
 584 {
 585         int i, newest_slot = -1;
 586         struct timeval newest_rstime = {0, 0};
 587
 588         FOR_EACH_SLOT(i) {
 589                 struct slot_info *s = &slot[i];
 590                 struct timeval rstime;
 591                 if (!s->receiver_node)
 592                         continue;
 593                 if (s->receiver_node->task.error < 0)
 594                         continue;
 595                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 596                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 597                         continue;
 598                 newest_rstime = rstime;
 599                 newest_slot = i;
 600         }
 601         if (newest_slot == -1)
 602                 return NULL;
 603         return slot[newest_slot].receiver_node->btrn;
 604 }
 605
 606 /* returns slot num on success. */
 607 static int open_current_receiver(void)
 608 {
 609         int ret, cafn = stat_task->current_audio_format_num;
 610
 611         if (cafn < 0 || !stat_task->ct)
 612                 return -1;
 613         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 614         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 615                 return -1;
 616         ret = receiver_running(cafn);
 617         if (ret != 0) /* already running */
 618                 return -1;
 619         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 620                 return -1;
 621         /* start a new receiver */
 622         return open_receiver(cafn);
 623 }
 624
 625 static unsigned compute_time_diff(const struct timeval *status_time)
 626 {
 627         struct timeval tmp, diff;
 628         static unsigned count;
 629         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 630         const struct timeval max_deviation = {0, 500 * 1000};
 631         const int time_smooth = 5;
 632
 633         if (!status_time)
 634                 return count;
 635         sign = tv_diff(status_time, now, &diff);
 636 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 637 //                      sign, sa_time_diff_sign);
 638         if (!count) {
 639                 sa_time_diff_sign = sign;
 640                 stat_task->sa_time_diff = diff;
 641                 count++;
 642                 goto out;
 643         }
 644         if (count > 5) {
 645                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 646                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 647                         PARA_WARNING_LOG("time diff jump: %lims\n",
 648                                 s * tv2ms(&tmp));
 649         }
 650         count++;
 651         sa_time_diff_sign = tv_convex_combination(
 652                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 653                 count > 10? sign : sign * time_smooth, &diff,
 654                 &tmp);
 655         stat_task->sa_time_diff = tmp;
 656         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 657                 sign > 0? "+" : "-",
 658                 tv2ms(&diff),
 659                 sa_time_diff_sign ? "+" : "-",
 660                 tv2ms(&stat_task->sa_time_diff)
 661         );
 662 out:
 663         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 664         return count;
 665 }
 666
 667 static int update_item(int itemnum, char *buf)
 668 {
 669         long unsigned sec, usec;
 670
 671         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 672                 return 1;
 673         free(stat_item_values[itemnum]);
 674         stat_item_values[itemnum] = para_strdup(buf);
 675         stat_client_write_item(itemnum);
 676         switch (itemnum) {
 677         case SI_STATUS_FLAGS:
 678                 stat_task->vss_status = 0;
 679                 if (strchr(buf, 'N'))
 680                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 681                 if (strchr(buf, 'P'))
 682                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 683                 break;
 684         case SI_OFFSET:
 685                 stat_task->offset_seconds = atoi(buf);
 686                 break;
 687         case SI_SECONDS_TOTAL:
 688                 stat_task->length_seconds = atoi(buf);
 689                 break;
 690         case SI_STREAM_START:
 691                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 692                         struct timeval a_start, delay;
 693                         delay.tv_sec = conf.stream_delay_arg / 1000;
 694                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 695                         stat_task->server_stream_start.tv_sec = sec;
 696                         stat_task->server_stream_start.tv_usec = usec;
 697                         if (compute_time_diff(NULL) > 2) {
 698                                 if (stat_task->sa_time_diff_sign < 0)
 699                                         tv_add(&stat_task->server_stream_start,
 700                                                 &stat_task->sa_time_diff, &a_start);
 701                                 else
 702                                         tv_diff(&stat_task->server_stream_start,
 703                                                 &stat_task->sa_time_diff, &a_start);
 704                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 705                         }
 706                 }
 707                 break;
 708         case SI_CURRENT_TIME:
 709                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 710                         struct timeval tv = {sec, usec};
 711                         compute_time_diff(&tv);
 712                 }
 713                 break;
 714         case SI_FORMAT:
 715                 stat_task->current_audio_format_num
 716                         = get_audio_format_num(buf);
 717         }
 718         return 1;
 719 }
 720
 721 static int parse_stream_command(const char *txt, char **cmd)
 722 {
 723         char *p = strchr(txt, ':');
 724         int i;
 725
 726         if (!p)
 727                 return -E_MISSING_COLON;
 728         p++;
 729         FOR_EACH_AUDIO_FORMAT(i) {
 730                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 731                         continue;
 732                 *cmd = p;
 733                 return i;
 734         }
 735         return -E_UNSUPPORTED_AUDIO_FORMAT;
 736 }
 737
 738 static int add_filter(int format, char *cmdline)
 739 {
 740         struct audio_format_info *a = &afi[format];
 741         int filter_num, nf = a->num_filters;
 742
 743         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 744         if (filter_num < 0)
 745                 return filter_num;
 746         a->filter_nums[nf] = filter_num;
 747         a->num_filters++;
 748         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 749                 filters[filter_num].name);
 750         return filter_num;
 751 }
 752
 753 static int parse_writer_args(void)
 754 {
 755         int i, ret, nw;
 756         char *cmd;
 757         struct audio_format_info *a;
 758
 759         nw = PARA_MAX(1U, conf.writer_given);
 760         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 761         FOR_EACH_AUDIO_FORMAT(i) {
 762                 a = &afi[i];
 763                 a->writer_conf = para_malloc(nw * sizeof(void *));
 764                 a->writer_nums = para_malloc(nw * sizeof(int));
 765                 a->num_writers = 0;
 766         }
 767         for (i = 0; i < conf.writer_given; i++) {
 768                 void *wconf;
 769                 int writer_num;
 770                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 771                 if (ret < 0)
 772                         goto out;
 773                 a = &afi[ret];
 774                 nw = a->num_writers;
 775                 wconf = check_writer_arg(cmd, &writer_num);
 776                 if (!wconf) {
 777                         ret = writer_num;
 778                         goto out;
 779                 }
 780                 a->writer_nums[nw] = writer_num;
 781                 a->writer_conf[nw] = wconf;
 782                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 783                         nw, writer_names[writer_num]);
 784                 a->num_writers++;
 785         }
 786         ret = 1;
 787 out:
 788         return ret;
 789 }
 790
 791 static int parse_receiver_args(void)
 792 {
 793         int i, ret, receiver_num;
 794         char *cmd = NULL;
 795         struct audio_format_info *a;
 796
 797         for (i = conf.receiver_given - 1; i >= 0; i--) {
 798                 char *arg = conf.receiver_arg[i];
 799                 char *recv_arg = strchr(arg, ':');
 800                 ret = -E_MISSING_COLON;
 801                 if (!recv_arg)
 802                         goto out;
 803                 *recv_arg = '\0';
 804                 recv_arg++;
 805                 ret = get_audio_format_num(arg);
 806                 if (ret < 0)
 807                         goto out;
 808                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 809                 if (!afi[ret].receiver_conf) {
 810                         ret = -E_RECV_SYNTAX;
 811                         goto out;
 812                 }
 813                 afi[ret].receiver = &receivers[receiver_num];
 814         }
 815         /* use the first available receiver with no arguments
 816          * for those audio formats for which no receiver
 817          * was specified
 818          */
 819         cmd = para_strdup(receivers[0].name);
 820         FOR_EACH_AUDIO_FORMAT(i) {
 821                 a = &afi[i];
 822                 if (a->receiver_conf)
 823                         continue;
 824                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 825                 if (!a->receiver_conf)
 826                         return -E_RECV_SYNTAX;
 827                 a->receiver = &receivers[receiver_num];
 828         }
 829         ret = 1;
 830 out:
 831         free(cmd);
 832         return ret;
 833 }
 834
 835 static int init_default_filters(void)
 836 {
 837         int i, ret = 1;
 838
 839         FOR_EACH_AUDIO_FORMAT(i) {
 840                 struct audio_format_info *a = &afi[i];
 841                 char *tmp;
 842                 int j;
 843
 844                 if (a->num_filters)
 845                         continue; /* no default -- nothing to to */
 846                 /* add "dec" to audio format name */
 847                 tmp = make_message("%sdec", audio_formats[i]);
 848                 for (j = 0; filters[j].name; j++)
 849                         if (!strcmp(tmp, filters[j].name))
 850                                 break;
 851                 free(tmp);
 852                 ret = -E_UNSUPPORTED_FILTER;
 853                 if (!filters[j].name)
 854                         goto out;
 855                 tmp = para_strdup(filters[j].name);
 856                 ret = add_filter(i, tmp);
 857                 free(tmp);
 858                 if (ret < 0)
 859                         goto out;
 860                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 861                         filters[j].name);
 862         }
 863 out:
 864         return ret;
 865 }
 866
 867 static int parse_filter_args(void)
 868 {
 869         int i, ret, nf;
 870
 871         nf = PARA_MAX(1U, conf.filter_given);
 872         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 873         FOR_EACH_AUDIO_FORMAT(i) {
 874                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 875                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 876         }
 877         if (!conf.no_default_filters_given)
 878                 return init_default_filters();
 879         for (i = 0; i < conf.filter_given; i++) {
 880                 char *arg = conf.filter_arg[i];
 881                 char *filter_name = strchr(arg, ':');
 882                 ret = -E_MISSING_COLON;
 883                 if (!filter_name)
 884                         goto out;
 885                 *filter_name = '\0';
 886                 filter_name++;
 887                 ret = get_audio_format_num(arg);
 888                 if (ret < 0)
 889                         goto out;
 890                 ret = add_filter(ret, filter_name);
 891                 if (ret < 0)
 892                         goto out;
 893         }
 894         ret = init_default_filters(); /* use default values for the rest */
 895 out:
 896         return ret;
 897 }
 898
 899 static int parse_stream_args(void)
 900 {
 901         int ret;
 902
 903         ret = parse_receiver_args();
 904         if (ret < 0)
 905                 return ret;
 906         ret = parse_filter_args();
 907         if (ret < 0)
 908                 return ret;
 909         ret = parse_writer_args();
 910         if (ret < 0)
 911                 return ret;
 912         return 1;
 913 }
 914
 915 /* does not unlink socket on errors */
 916 static int audiod_get_socket(void)
 917 {
 918         struct sockaddr_un unix_addr;
 919         int ret, fd;
 920
 921         if (conf.socket_given)
 922                 socket_name = para_strdup(conf.socket_arg);
 923         else {
 924                 char *hn = para_hostname();
 925                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 926                         hn);
 927                 free(hn);
 928         }
 929         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 930         if (conf.force_given)
 931                 unlink(socket_name);
 932         ret = create_local_socket(socket_name, &unix_addr,
 933                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 934         if (ret < 0)
 935                 goto err;
 936         fd = ret;
 937         if (listen(fd , 5) < 0) {
 938                 ret = -ERRNO_TO_PARA_ERROR(errno);
 939                 goto err;
 940         }
 941         ret = mark_fd_nonblocking(fd);
 942         if (ret < 0)
 943                 goto err;
 944         return fd;
 945 err:
 946         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 947         exit(EXIT_FAILURE);
 948 }
 949
 950 static void signal_pre_select(struct sched *s, struct task *t)
 951 {
 952         struct signal_task *st = container_of(t, struct signal_task, task);
 953         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 954 }
 955
 956 static void signal_post_select(struct sched *s, struct task *t)
 957 {
 958         struct signal_task *st = container_of(t, struct signal_task, task);
 959
 960         if (!FD_ISSET(st->fd, &s->rfds))
 961                 return;
 962
 963         st->signum = para_next_signal();
 964         switch (st->signum) {
 965         case SIGINT:
 966         case SIGTERM:
 967         case SIGHUP:
 968                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 969                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 970         }
 971 }
 972
 973 static void signal_setup_default(struct signal_task *st)
 974 {
 975         st->task.pre_select = signal_pre_select;
 976         st->task.post_select = signal_post_select;
 977         sprintf(st->task.status, "signal task");
 978 }
 979
 980 static void command_pre_select(struct sched *s, struct task *t)
 981 {
 982         struct command_task *ct = container_of(t, struct command_task, task);
 983         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 984 }
 985
 986 static void command_post_select(struct sched *s, struct task *t)
 987 {
 988         int ret;
 989         struct command_task *ct = container_of(t, struct command_task, task);
 990         static struct timeval last_status_dump;
 991         struct timeval tmp, delay = {0, 500 * 1000};
 992
 993         tv_add(&last_status_dump, &delay, &tmp);
 994         if (tv_diff(&tmp, now, NULL) < 0) {
 995                 audiod_status_dump();
 996                 last_status_dump = *now;
 997         }
 998
 999         if (!FD_ISSET(ct->fd, &s->rfds))
1000                 return;
1001         ret = handle_connect(ct->fd);
1002         if (ret < 0)
1003                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1004 }
1005
1006 static void init_command_task(struct command_task *ct)
1007 {
1008         ct->task.pre_select = command_pre_select;
1009         ct->task.post_select = command_post_select;
1010         ct->task.error = 0;
1011         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1012         sprintf(ct->task.status, "command task");
1013 }
1014
1015 static void close_stat_pipe(void)
1016 {
1017         if (!stat_task->ct)
1018                 return;
1019         btr_free_node(stat_task->ct->btrn);
1020         client_close(stat_task->ct);
1021         stat_task->ct = NULL;
1022         clear_and_dump_items();
1023         stat_task->length_seconds = 0;
1024         stat_task->offset_seconds = 0;
1025         stat_task->vss_status = 0;
1026         stat_task->current_audio_format_num = -1;
1027         audiod_status_dump();
1028 }
1029
1030 /**
1031  * close the connection to para_server and exit
1032  *
1033  * \param status the exit status which is passed to exit(3)
1034  * \param msg the log message
1035  *
1036  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1037  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1038  * EXIT_FAILURE.
1039  *
1040  * \sa exit(3)
1041  */
1042 void __noreturn clean_exit(int status, const char *msg)
1043 {
1044         PARA_EMERG_LOG("%s\n", msg);
1045         if (socket_name)
1046                 unlink(socket_name);
1047         close_stat_pipe();
1048         exit(status);
1049 }
1050
1051 /* avoid busy loop if server is down */
1052 static void set_stat_task_restart_barrier(unsigned seconds)
1053 {
1054         struct timeval delay = {seconds, 0};
1055         tv_add(now, &delay, &stat_task->restart_barrier);
1056 }
1057
1058 static void try_to_close_slot(int slot_num)
1059 {
1060         struct slot_info *s = &slot[slot_num];
1061         struct audio_format_info *a = afi + s->format;
1062         int i;
1063
1064         if (s->format < 0)
1065                 return;
1066         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1067                 return;
1068         for (i = 0; i < a->num_filters; i++)
1069                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1070                         return;
1071         if (a->num_writers > 0) {
1072                 for (i = 0; i < a->num_writers; i++)
1073                         if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1074                                 return;
1075         } else {
1076                 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1077                         return;
1078         }
1079         PARA_INFO_LOG("closing slot %d\n", slot_num);
1080         close_writers(s);
1081         close_filters(s);
1082         close_receiver(slot_num);
1083         clear_slot(slot_num);
1084 }
1085
1086 /*
1087  * Check if any receivers/filters/writers need to be started and do so if
1088  * necessary.
1089  */
1090 static void start_stop_decoders(void)
1091 {
1092         int i, ret;
1093         struct slot_info *sl;
1094         struct audio_format_info *a;
1095
1096         FOR_EACH_SLOT(i)
1097                 try_to_close_slot(i);
1098         if (audiod_status != AUDIOD_ON ||
1099                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1100                 return kill_all_decoders(-E_NOT_PLAYING);
1101         ret = open_current_receiver();
1102         if (ret < 0)
1103                 return;
1104         sl = slot + ret;
1105         a = afi + sl->format;
1106         if (a->num_filters)
1107                 open_filters(sl);
1108         open_writers(sl);
1109         activate_grab_clients();
1110         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1111 }
1112
1113 static void status_pre_select(struct sched *s, struct task *t)
1114 {
1115         struct status_task *st = container_of(t, struct status_task, task);
1116         int ret;
1117
1118         ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1119         sched_request_barrier(&st->restart_barrier, s);
1120 }
1121
1122 /* restart the client task if necessary */
1123 static void status_post_select(__a_unused struct sched *s, struct task *t)
1124 {
1125         struct status_task *st = container_of(t, struct status_task, task);
1126
1127         if (audiod_status == AUDIOD_OFF) {
1128                 if (!st->ct)
1129                         goto out;
1130                 if (st->ct->task.error >= 0) {
1131                         kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1132                         goto out;
1133                 }
1134                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1135                         goto out;
1136                 close_stat_pipe();
1137                 st->clock_diff_count = conf.clock_diff_count_arg;
1138                 goto out;
1139         }
1140         if (st->ct) {
1141                 char *buf;
1142                 size_t sz;
1143                 int ret;
1144                 if (st->ct->task.error < 0) {
1145                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1146                                 goto out;
1147                         close_stat_pipe();
1148                         goto out;
1149                 }
1150                 if (st->ct->status != CL_RECEIVING)
1151                         goto out;
1152                 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1153                 if (ret <= 0)
1154                         goto out;
1155                 sz = btr_next_buffer(st->btrn, &buf);
1156                 ret = for_each_stat_item(buf, sz, update_item);
1157                 if (ret < 0) {
1158                         kill_btrn(st->ct->btrn, &st->ct->task, ret);
1159                         goto out;
1160                 }
1161                 if (sz != ret)
1162                         st->last_status_read = *now;
1163                 else {
1164                         struct timeval diff;
1165                         tv_diff(now, &st->last_status_read, &diff);
1166                         if (diff.tv_sec > 61)
1167                                 kill_btrn(st->ct->btrn, &st->ct->task,
1168                                         -E_STATUS_TIMEOUT);
1169                 }
1170                 btr_consume(st->btrn, sz - ret);
1171                 goto out;
1172         }
1173         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1174                 goto out;
1175         if (st->clock_diff_count) { /* get status only one time */
1176                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1177                 int argc = 5;
1178                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1179                 st->clock_diff_count--;
1180                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1181                 set_stat_task_restart_barrier(2);
1182
1183         } else {
1184                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1185                 int argc = 4;
1186                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1187                 set_stat_task_restart_barrier(5);
1188         }
1189         free(stat_item_values[SI_BASENAME]);
1190         stat_item_values[SI_BASENAME] = para_strdup(
1191                 "no connection to para_server");
1192         stat_client_write_item(SI_BASENAME);
1193         st->last_status_read = *now;
1194 out:
1195         start_stop_decoders();
1196 }
1197
1198 static void init_status_task(struct status_task *st)
1199 {
1200         memset(st, 0, sizeof(struct status_task));
1201         st->task.pre_select = status_pre_select;
1202         st->task.post_select = status_post_select;
1203         st->sa_time_diff_sign = 1;
1204         st->clock_diff_count = conf.clock_diff_count_arg;
1205         st->current_audio_format_num = -1;
1206         sprintf(st->task.status, "stat");
1207         st->btrn = btr_new_node(&(struct btr_node_description)
1208                 EMBRACE(.name = "stat"));
1209 }
1210
1211 static void set_initial_status(void)
1212 {
1213         audiod_status = AUDIOD_ON;
1214         if (!conf.mode_given)
1215                 return;
1216         if (!strcmp(conf.mode_arg, "sb")) {
1217                 audiod_status = AUDIOD_STANDBY;
1218                 return;
1219         }
1220         if (!strcmp(conf.mode_arg, "off")) {
1221                 audiod_status = AUDIOD_OFF;
1222                 return;
1223         }
1224         if (strcmp(conf.mode_arg, "on"))
1225                 PARA_WARNING_LOG("invalid mode\n");
1226 }
1227
1228 __noreturn static void print_help_and_die(void)
1229 {
1230         int d = conf.detailed_help_given;
1231         const char **p = d? audiod_args_info_detailed_help
1232                 : audiod_args_info_help;
1233
1234         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1235                 AUDIOD_CMDLINE_PARSER_VERSION);
1236         printf_or_die("%s\n\n", audiod_args_info_usage);
1237         for (; *p; p++)
1238                 printf_or_die("%s\n", *p);
1239         print_receiver_helps(d);
1240         print_filter_helps(d);
1241         print_writer_helps(d);
1242         exit(0);
1243 }
1244
1245 static void init_colors_or_die(void)
1246 {
1247         int ret, i;
1248
1249         if (!want_colors())
1250                 return;
1251         daemon_set_default_log_colors();
1252         daemon_set_flag(DF_COLOR_LOG);
1253         for (i = 0; i < conf.log_color_given; i++) {
1254                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1255                 if (ret < 0)
1256                         exit(EXIT_FAILURE);
1257         }
1258 }
1259
1260 /**
1261  * the main function of para_audiod
1262  *
1263  * \param argc usual argument count
1264  * \param argv usual argument vector
1265  *
1266  * \return EXIT_SUCCESS or EXIT_FAILURE
1267  *
1268  * \sa para_audiod(1)
1269  * */
1270 int main(int argc, char *argv[])
1271 {
1272         int ret, i;
1273         static struct sched s;
1274         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1275         struct audiod_cmdline_parser_params params = {
1276                 .override = 0,
1277                 .initialize = 1,
1278                 .check_required = 0,
1279                 .check_ambiguity = 0,
1280                 .print_errors = 1
1281         };
1282
1283         valid_fd_012();
1284         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1285                 exit(EXIT_FAILURE);
1286         HANDLE_VERSION_FLAG("audiod", conf);
1287         /* init receivers/filters/writers early to make help work */
1288         recv_init();
1289         filter_init();
1290         writer_init();
1291         if (conf.help_given || conf.detailed_help_given)
1292                 print_help_and_die();
1293         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1294         parse_config_or_die();
1295         init_colors_or_die();
1296         init_random_seed_or_die();
1297         daemon_set_flag(DF_LOG_TIME);
1298         daemon_set_flag(DF_LOG_HOSTNAME);
1299         daemon_set_flag(DF_LOG_LL);
1300         if (conf.log_timing_given)
1301                 daemon_set_flag(DF_LOG_TIMING);
1302         if (conf.logfile_given) {
1303                 daemon_set_logfile(conf.logfile_arg);
1304                 daemon_open_log_or_die();
1305         }
1306         ret = parse_stream_args();
1307         if (ret < 0) {
1308                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1309                 exit(EXIT_FAILURE);
1310         }
1311         log_welcome("para_audiod");
1312         server_uptime(UPTIME_SET);
1313         set_initial_status();
1314         FOR_EACH_SLOT(i)
1315                 clear_slot(i);
1316         setup_signal_handling();
1317         signal_setup_default(sig_task);
1318
1319         init_status_task(stat_task);
1320         init_command_task(cmd_task);
1321
1322         if (conf.daemon_given)
1323                 daemonize();
1324
1325         register_task(&sig_task->task);
1326         register_task(&cmd_task->task);
1327         register_task(&stat_task->task);
1328         s.default_timeout.tv_sec = 2;
1329         s.default_timeout.tv_usec = 999 * 1000;
1330         ret = schedule(&s);
1331
1332         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1333         return EXIT_FAILURE;
1334 }