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 };
 114
 115 /** The array of status items sent by para_server. */
 116 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 117
 118 /**
 119  * the current mode of operation of which can be changed by the on/off/cycle
 120  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 121  */
 122 int audiod_status = AUDIOD_ON;
 123
 124 /**
 125  * the gengetopt args_info struct that holds information on all command line
 126  * arguments
 127  */
 128 struct audiod_args_info conf;
 129
 130 static char *socket_name;
 131 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 132
 133 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 134
 135 static struct status_task status_task_struct;
 136
 137 /**
 138  * the task that calls the status command of para_server
 139  *
 140  * \sa struct status_task
 141  */
 142 static struct status_task *stat_task = &status_task_struct;
 143 static struct timeval initial_delay_barrier;
 144
 145 /**
 146  * the task for handling audiod commands
 147  *
 148  * \sa struct task, struct sched
 149  */
 150 struct command_task {
 151         /** the local listening socket */
 152         int fd;
 153         /** the associated task structure */
 154         struct task task;
 155 };
 156
 157 /** iterate over all supported audio formats */
 158 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 159
 160 /**
 161  * get the audio format number
 162  * \param name the name of the audio format
 163  *
 164  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 165  * \a name is not a supported audio format.
 166  */
 167 int get_audio_format_num(const char *name)
 168 {
 169         int i;
 170
 171         while (para_isspace(*name))
 172                 name++;
 173         FOR_EACH_AUDIO_FORMAT(i)
 174                 if (!strcmp(name, audio_formats[i]))
 175                         return i;
 176         return -E_UNSUPPORTED_AUDIO_FORMAT;
 177 }
 178
 179 char *get_time_string(int slot_num)
 180 {
 181         int ret, seconds = 0, length;
 182         struct timeval *tmp, sum, sss, /* server stream start */
 183                 rstime, /* receiver start time */
 184                 wstime, /* writer start time */
 185                 wtime, /* now - writer start */
 186                 rskip; /* receiver start - sss */
 187         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 188         char *msg;
 189
 190         if (audiod_status == AUDIOD_OFF)
 191                 goto empty;
 192         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 193                 if (stat_task->length_seconds) /* paused */
 194                         return NULL;
 195                 goto empty; /* stopped */
 196         }
 197         if (audiod_status == AUDIOD_ON && !s)
 198                 goto empty;
 199         /*
 200          * Valid status items and playing, set length and tmp to the stream
 201          * start. We use the slot info and fall back to the info from current
 202          * status items if no slot info is available.
 203          */
 204         length = stat_task->length_seconds;
 205         tmp = &stat_task->server_stream_start;
 206         if (s && s->wns) { /* writer active in this slot */
 207                 btr_get_node_start(s->wns[0].btrn, &wstime);
 208                 if (wstime.tv_sec != 0) { /* writer wrote something */
 209                         if (s->server_stream_start.tv_sec == 0) {
 210                                 /* copy status info to slot */
 211                                 s->server_stream_start = stat_task->server_stream_start;
 212                                 s->offset_seconds = stat_task->offset_seconds;
 213                                 s->seconds_total = stat_task->length_seconds;
 214                         }
 215                         length = s->seconds_total;
 216                         tmp = &s->server_stream_start;
 217                 }
 218         }
 219         if (stat_task->sa_time_diff_sign > 0)
 220                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 221         else
 222                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 223         if (!s || !s->wns) {
 224                 struct timeval diff;
 225                 tv_diff(now, &sss, &diff);
 226                 seconds = diff.tv_sec + stat_task->offset_seconds;
 227                 goto out;
 228         }
 229         tv_diff(now, &wstime, &wtime);
 230         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 231         seconds = s->offset_seconds;
 232         btr_get_node_start(s->receiver_node->btrn, &rstime);
 233         ret = tv_diff(&rstime, &sss, &rskip);
 234         if (ret > 0) { /* audiod was started in the middle of the stream */
 235                 tv_add(&wtime, &rskip, &sum);
 236                 seconds += sum.tv_sec;
 237         } else
 238                 seconds += wtime.tv_sec;
 239 out:
 240         seconds = PARA_MIN(seconds, length);
 241         seconds = PARA_MAX(seconds, 0);
 242         msg = make_message(
 243                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 244                 s? "" : "~",
 245                 seconds / 60,
 246                 seconds % 60,
 247                 (length - seconds) / 60,
 248                 (length - seconds) % 60,
 249                 length? (seconds * 100 + length / 2) / length : 0,
 250                 length / 60,
 251                 length % 60
 252         );
 253         PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 254         return msg;
 255 empty:
 256         return para_strdup(NULL);
 257 }
 258
 259 static int want_colors(void)
 260 {
 261         if (conf.color_arg == color_arg_no)
 262                 return 0;
 263         if (conf.color_arg == color_arg_yes)
 264                 return 1;
 265         if (conf.logfile_given)
 266                 return 0;
 267         return isatty(STDERR_FILENO);
 268 }
 269
 270 static void parse_config_or_die(void)
 271 {
 272         int ret;
 273         char *config_file;
 274         struct audiod_cmdline_parser_params params = {
 275                 .override = 0,
 276                 .initialize = 0,
 277                 .check_required = 1,
 278                 .check_ambiguity = 0,
 279                 .print_errors = 1
 280         };
 281
 282         if (conf.config_file_given)
 283                 config_file = para_strdup(conf.config_file_arg);
 284         else {
 285                 char *home = para_homedir();
 286                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 287                 free(home);
 288         }
 289         ret = file_exists(config_file);
 290         if (conf.config_file_given && !ret) {
 291                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 292                 goto err;
 293         }
 294         if (ret)
 295                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 296         free(config_file);
 297         daemon_set_loglevel(conf.loglevel_arg);
 298         return;
 299 err:
 300         free(config_file);
 301         exit(EXIT_FAILURE);
 302 }
 303
 304 static void setup_signal_handling(void)
 305 {
 306         sig_task->fd = para_signal_init();
 307         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 308         para_install_sighandler(SIGINT);
 309         para_install_sighandler(SIGTERM);
 310         para_install_sighandler(SIGHUP);
 311         para_sigaction(SIGPIPE, SIG_IGN);
 312 }
 313
 314 static void clear_slot(int slot_num)
 315 {
 316         struct slot_info *s = &slot[slot_num];
 317
 318         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 319         memset(s, 0, sizeof(struct slot_info));
 320         s->format = -1;
 321 }
 322
 323 static void close_receiver(int slot_num)
 324 {
 325         struct slot_info *s = &slot[slot_num];
 326         struct audio_format_info *a;
 327         struct timeval restart_delay = {0, 200 * 1000};
 328
 329         if (s->format < 0 || !s->receiver_node)
 330                 return;
 331         a = &afi[s->format];
 332         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 333                 audio_formats[s->format], slot_num);
 334         a->receiver->close(s->receiver_node);
 335         btr_free_node(s->receiver_node->btrn);
 336         free(s->receiver_node);
 337         s->receiver_node = NULL;
 338         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 339 }
 340
 341 static void writer_cleanup(struct writer_node *wn)
 342 {
 343         struct writer *w;
 344
 345         if (!wn)
 346                 return;
 347         w = writers + wn->writer_num;
 348         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 349         w->close(wn);
 350         btr_free_node(wn->btrn);
 351 }
 352
 353 static void close_writers(struct slot_info *s)
 354 {
 355         struct audio_format_info *a;
 356         int i;
 357
 358         if (s->format < 0)
 359                 return;
 360         a = afi + s->format;
 361         if (a->num_writers == 0)
 362                 writer_cleanup(s->wns);
 363         else {
 364                 for (i = 0; i < a->num_writers; i++)
 365                         writer_cleanup(s->wns + i);
 366         }
 367         free(s->wns);
 368         s->wns = NULL;
 369 }
 370
 371 static void close_filters(struct slot_info *s)
 372 {
 373         int i;
 374         struct audio_format_info *a = afi + s->format;
 375         if (a->num_filters == 0)
 376                 return;
 377         for (i = 0; i < a->num_filters; i++) {
 378                 struct filter_node *fn = s->fns + i;
 379                 struct filter *f;
 380
 381                 if (!fn)
 382                         continue;
 383                 f = filters + fn->filter_num;
 384                 if (f->close)
 385                         f->close(fn);
 386                 btr_free_node(fn->btrn);
 387         }
 388         free(s->fns);
 389         s->fns = NULL;
 390 }
 391
 392 /*
 393  * Whenever a task commits suicide by returning from post_select with t->error
 394  * < 0, it also removes its btr node. We do exactly that to kill a running
 395  * task. Note that the scheduler checks t->error also _before_ each pre/post
 396  * select call, so the victim will never be scheduled again.
 397  */
 398 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
 399 {
 400         if (t->error < 0)
 401                 return;
 402         t->error = error;
 403         btr_remove_node(btrn);
 404 }
 405
 406 static void kill_all_decoders(int error)
 407 {
 408         int i, j;
 409
 410         FOR_EACH_SLOT(i) {
 411                 struct slot_info *s = &slot[i];
 412                 struct audio_format_info *a;
 413                 if (s->format < 0)
 414                         continue;
 415                 a = afi + s->format;
 416                 if (s->wns)
 417                         for (j = 0; j < a->num_writers; j++)
 418                                 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
 419                 if (s->fns)
 420                         for (j = 0; j < a->num_writers; j++)
 421                                 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
 422                 if (s->receiver_node)
 423                         kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
 424                                 error);
 425         }
 426 }
 427
 428 static int get_empty_slot(void)
 429 {
 430         int i;
 431         struct slot_info *s;
 432
 433         FOR_EACH_SLOT(i) {
 434                 s = &slot[i];
 435                 if (s->format < 0) {
 436                         clear_slot(i);
 437                         return i;
 438                 }
 439                 if (s->wns || s->receiver_node || s->fns)
 440                         continue;
 441                 clear_slot(i);
 442                 return i;
 443         }
 444         return -E_NO_MORE_SLOTS;
 445 }
 446
 447 /**
 448  * get the number of filters
 449  *
 450  * \param audio_format_num the number identifying the audio format
 451  *
 452  * \return the number of filters for the given audio format
 453  *
 454  * \sa struct filter;
 455  */
 456 int num_filters(int audio_format_num)
 457 {
 458         return afi[audio_format_num].num_filters;
 459 }
 460
 461 static void open_filters(struct slot_info *s)
 462 {
 463         struct audio_format_info *a = afi + s->format;
 464         struct filter_node *fn;
 465         int nf = a->num_filters;
 466         struct btr_node *parent;
 467         int i;
 468
 469         if (nf == 0)
 470                 return;
 471         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 472         assert(s->fns == NULL);
 473         s->fns = para_calloc(nf * sizeof(struct filter_node));
 474         parent = s->receiver_node->btrn;
 475         for (i = 0; i < nf; i++) {
 476                 struct filter *f = filters + a->filter_nums[i];
 477                 fn = s->fns + i;
 478                 fn->filter_num = a->filter_nums[i];
 479                 fn->conf = a->filter_conf[i];
 480                 fn->task.pre_select = f->pre_select;
 481                 fn->task.post_select = f->post_select;
 482
 483                 fn->btrn = btr_new_node(&(struct btr_node_description)
 484                         EMBRACE(.name = f->name, .parent = parent,
 485                                 .handler = f->execute, .context = fn));
 486
 487                 f->open(fn);
 488                 register_task(&fn->task);
 489                 parent = fn->btrn;
 490                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 491                         audio_formats[s->format], i,  nf, f->name, s - slot);
 492                 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
 493         }
 494 }
 495
 496 static void open_writers(struct slot_info *s)
 497 {
 498         int i;
 499         struct audio_format_info *a = afi + s->format;
 500         struct writer_node *wn;
 501         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 502
 503         assert(s->wns == NULL);
 504         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 505                 * sizeof(struct writer_node));
 506         if (a->num_writers == 0)
 507                 setup_writer_node(NULL, parent, s->wns);
 508         else {
 509                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 510                 for (i = 0; i < a->num_writers; i++) {
 511                         wn = s->wns + i;
 512                         wn->conf = a->writer_conf[i];
 513                         wn->writer_num = a->writer_nums[i];
 514                         register_writer_node(wn, parent);
 515                 }
 516         }
 517 }
 518
 519 /* returns slot num on success */
 520 static int open_receiver(int format)
 521 {
 522         struct audio_format_info *a = &afi[format];
 523         struct slot_info *s;
 524         int ret, slot_num;
 525         struct receiver *r = a->receiver;
 526         struct receiver_node *rn;
 527         const struct timeval restart_delay = {2, 0};
 528
 529         ret = get_empty_slot();
 530         if (ret < 0)
 531                 goto err;
 532         slot_num = ret;
 533         s = &slot[slot_num];
 534         s->format = format;
 535         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 536         rn = s->receiver_node;
 537         rn->receiver = r;
 538         rn->conf = a->receiver_conf;
 539         rn->btrn = btr_new_node(&(struct btr_node_description)
 540                 EMBRACE(.name = r->name, .context = rn));
 541         ret = r->open(rn);
 542         if (ret < 0) {
 543                 btr_free_node(rn->btrn);
 544                 free(rn);
 545                 s->receiver_node = NULL;
 546                 goto err;
 547         }
 548         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 549                 audio_formats[s->format], r->name, slot_num);
 550         rn->task.pre_select = r->pre_select;
 551         rn->task.post_select = r->post_select;
 552         sprintf(rn->task.status, "%s receiver node", r->name);
 553         register_task(&rn->task);
 554         ret = slot_num;
 555 err:
 556         if (ret < 0)
 557                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 558         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 559         return ret;
 560 }
 561
 562 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 563 static int receiver_running(int format)
 564 {
 565         int i, ret = 0;
 566
 567         FOR_EACH_SLOT(i) {
 568                 struct slot_info *s = &slot[i];
 569                 if (s->format != format)
 570                         continue;
 571                 if (!s->receiver_node)
 572                         continue;
 573                 if (s->receiver_node->task.error >= 0)
 574                         return 1;
 575                 ret = -1;
 576         }
 577         return ret;
 578 }
 579
 580 struct btr_node *audiod_get_btr_root(void)
 581 {
 582         int i, newest_slot = -1;
 583         struct timeval newest_rstime = {0, 0};
 584
 585         FOR_EACH_SLOT(i) {
 586                 struct slot_info *s = &slot[i];
 587                 struct timeval rstime;
 588                 if (!s->receiver_node)
 589                         continue;
 590                 if (s->receiver_node->task.error < 0)
 591                         continue;
 592                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 593                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 594                         continue;
 595                 newest_rstime = rstime;
 596                 newest_slot = i;
 597         }
 598         if (newest_slot == -1)
 599                 return NULL;
 600         return slot[newest_slot].receiver_node->btrn;
 601 }
 602
 603 /* returns slot num on success. */
 604 static int open_current_receiver(struct sched *s)
 605 {
 606         struct timeval diff;
 607         int ret, cafn = stat_task->current_audio_format_num;
 608
 609         if (cafn < 0 || !stat_task->ct)
 610                 return -1;
 611         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 612         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 613                 return -1;
 614         ret = receiver_running(cafn);
 615         if (ret > 0) /* already running and not eof */
 616                 return -1;
 617         if (ret < 0) { /* eof */
 618                 /*
 619                  * para_server uses a zero start time during the announcement
 620                  * period, i.e. before it sends the first chunk. Wait until
 621                  * this period begins to avoid restarting the receiver that
 622                  * belongs to the file just completed.
 623                  */
 624                 if (stat_task->server_stream_start.tv_sec != 0) {
 625                         sched_request_timeout_ms(100, s);
 626                         return -1;
 627                 }
 628         }
 629         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 630                 if (tv_diff(&s->timeout, &diff, NULL) > 0)
 631                         sched_request_timeout(&diff, s);
 632                 else
 633                         sched_min_delay(s);
 634                 return -1;
 635         }
 636         /* start a new receiver */
 637         return open_receiver(cafn);
 638 }
 639
 640 static unsigned compute_time_diff(const struct timeval *status_time)
 641 {
 642         struct timeval tmp, diff;
 643         static unsigned count;
 644         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 645         const struct timeval max_deviation = {0, 500 * 1000};
 646         const int time_smooth = 5;
 647
 648         if (!status_time)
 649                 return count;
 650         sign = tv_diff(status_time, now, &diff);
 651 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 652 //                      sign, sa_time_diff_sign);
 653         if (!count) {
 654                 sa_time_diff_sign = sign;
 655                 stat_task->sa_time_diff = diff;
 656                 count++;
 657                 goto out;
 658         }
 659         if (count > 5) {
 660                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 661                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 662                         PARA_WARNING_LOG("time diff jump: %lims\n",
 663                                 s * tv2ms(&tmp));
 664         }
 665         count++;
 666         sa_time_diff_sign = tv_convex_combination(
 667                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 668                 count > 10? sign : sign * time_smooth, &diff,
 669                 &tmp);
 670         stat_task->sa_time_diff = tmp;
 671         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 672                 sign > 0? "+" : "-",
 673                 tv2ms(&diff),
 674                 sa_time_diff_sign ? "+" : "-",
 675                 tv2ms(&stat_task->sa_time_diff)
 676         );
 677 out:
 678         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 679         return count;
 680 }
 681
 682 static int update_item(int itemnum, char *buf)
 683 {
 684         long unsigned sec, usec;
 685
 686         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 687                 return 1;
 688         free(stat_item_values[itemnum]);
 689         stat_item_values[itemnum] = para_strdup(buf);
 690         stat_client_write_item(itemnum);
 691         switch (itemnum) {
 692         case SI_STATUS_FLAGS:
 693                 stat_task->vss_status = 0;
 694                 if (strchr(buf, 'N'))
 695                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 696                 if (strchr(buf, 'P'))
 697                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 698                 break;
 699         case SI_OFFSET:
 700                 stat_task->offset_seconds = atoi(buf);
 701                 break;
 702         case SI_SECONDS_TOTAL:
 703                 stat_task->length_seconds = atoi(buf);
 704                 break;
 705         case SI_STREAM_START:
 706                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 707                         struct timeval a_start, delay;
 708                         delay.tv_sec = conf.stream_delay_arg / 1000;
 709                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 710                         stat_task->server_stream_start.tv_sec = sec;
 711                         stat_task->server_stream_start.tv_usec = usec;
 712                         if (compute_time_diff(NULL) > 2) {
 713                                 if (stat_task->sa_time_diff_sign < 0)
 714                                         tv_add(&stat_task->server_stream_start,
 715                                                 &stat_task->sa_time_diff, &a_start);
 716                                 else
 717                                         tv_diff(&stat_task->server_stream_start,
 718                                                 &stat_task->sa_time_diff, &a_start);
 719                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 720                         }
 721                 }
 722                 break;
 723         case SI_CURRENT_TIME:
 724                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 725                         struct timeval tv = {sec, usec};
 726                         compute_time_diff(&tv);
 727                 }
 728                 break;
 729         case SI_FORMAT:
 730                 stat_task->current_audio_format_num
 731                         = get_audio_format_num(buf);
 732         }
 733         return 1;
 734 }
 735
 736 static int parse_stream_command(const char *txt, char **cmd)
 737 {
 738         char *p = strchr(txt, ':');
 739         int i;
 740
 741         if (!p)
 742                 return -E_MISSING_COLON;
 743         p++;
 744         FOR_EACH_AUDIO_FORMAT(i) {
 745                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 746                         continue;
 747                 *cmd = p;
 748                 return i;
 749         }
 750         return -E_UNSUPPORTED_AUDIO_FORMAT;
 751 }
 752
 753 static int add_filter(int format, char *cmdline)
 754 {
 755         struct audio_format_info *a = &afi[format];
 756         int filter_num, nf = a->num_filters;
 757
 758         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 759         if (filter_num < 0)
 760                 return filter_num;
 761         a->filter_nums[nf] = filter_num;
 762         a->num_filters++;
 763         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 764                 filters[filter_num].name);
 765         return filter_num;
 766 }
 767
 768 static int parse_writer_args(void)
 769 {
 770         int i, ret, nw;
 771         char *cmd;
 772         struct audio_format_info *a;
 773
 774         nw = PARA_MAX(1U, conf.writer_given);
 775         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 776         FOR_EACH_AUDIO_FORMAT(i) {
 777                 a = &afi[i];
 778                 a->writer_conf = para_malloc(nw * sizeof(void *));
 779                 a->writer_nums = para_malloc(nw * sizeof(int));
 780                 a->num_writers = 0;
 781         }
 782         for (i = 0; i < conf.writer_given; i++) {
 783                 void *wconf;
 784                 int writer_num;
 785                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 786                 if (ret < 0)
 787                         goto out;
 788                 a = &afi[ret];
 789                 nw = a->num_writers;
 790                 wconf = check_writer_arg(cmd, &writer_num);
 791                 if (!wconf) {
 792                         ret = writer_num;
 793                         goto out;
 794                 }
 795                 a->writer_nums[nw] = writer_num;
 796                 a->writer_conf[nw] = wconf;
 797                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 798                         nw, writer_names[writer_num]);
 799                 a->num_writers++;
 800         }
 801         ret = 1;
 802 out:
 803         return ret;
 804 }
 805
 806 static int parse_receiver_args(void)
 807 {
 808         int i, ret, receiver_num;
 809         char *cmd = NULL;
 810         struct audio_format_info *a;
 811
 812         for (i = conf.receiver_given - 1; i >= 0; i--) {
 813                 char *arg = conf.receiver_arg[i];
 814                 char *recv_arg = strchr(arg, ':');
 815                 ret = -E_MISSING_COLON;
 816                 if (!recv_arg)
 817                         goto out;
 818                 *recv_arg = '\0';
 819                 recv_arg++;
 820                 ret = get_audio_format_num(arg);
 821                 if (ret < 0)
 822                         goto out;
 823                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 824                 if (!afi[ret].receiver_conf) {
 825                         ret = -E_RECV_SYNTAX;
 826                         goto out;
 827                 }
 828                 afi[ret].receiver = &receivers[receiver_num];
 829         }
 830         /* use the first available receiver with no arguments
 831          * for those audio formats for which no receiver
 832          * was specified
 833          */
 834         cmd = para_strdup(receivers[0].name);
 835         FOR_EACH_AUDIO_FORMAT(i) {
 836                 a = &afi[i];
 837                 if (a->receiver_conf)
 838                         continue;
 839                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 840                 if (!a->receiver_conf)
 841                         return -E_RECV_SYNTAX;
 842                 a->receiver = &receivers[receiver_num];
 843         }
 844         ret = 1;
 845 out:
 846         free(cmd);
 847         return ret;
 848 }
 849
 850 static int init_default_filters(void)
 851 {
 852         int i, ret = 1;
 853
 854         FOR_EACH_AUDIO_FORMAT(i) {
 855                 struct audio_format_info *a = &afi[i];
 856                 char *tmp;
 857                 int j;
 858
 859                 if (a->num_filters)
 860                         continue; /* no default -- nothing to to */
 861                 /* add "dec" to audio format name */
 862                 tmp = make_message("%sdec", audio_formats[i]);
 863                 for (j = 0; filters[j].name; j++)
 864                         if (!strcmp(tmp, filters[j].name))
 865                                 break;
 866                 free(tmp);
 867                 ret = -E_UNSUPPORTED_FILTER;
 868                 if (!filters[j].name)
 869                         goto out;
 870                 tmp = para_strdup(filters[j].name);
 871                 ret = add_filter(i, tmp);
 872                 free(tmp);
 873                 if (ret < 0)
 874                         goto out;
 875                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 876                         filters[j].name);
 877         }
 878 out:
 879         return ret;
 880 }
 881
 882 static int parse_filter_args(void)
 883 {
 884         int i, ret, nf;
 885
 886         nf = PARA_MAX(1U, conf.filter_given);
 887         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 888         FOR_EACH_AUDIO_FORMAT(i) {
 889                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 890                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 891         }
 892         if (!conf.no_default_filters_given)
 893                 return init_default_filters();
 894         for (i = 0; i < conf.filter_given; i++) {
 895                 char *arg = conf.filter_arg[i];
 896                 char *filter_name = strchr(arg, ':');
 897                 ret = -E_MISSING_COLON;
 898                 if (!filter_name)
 899                         goto out;
 900                 *filter_name = '\0';
 901                 filter_name++;
 902                 ret = get_audio_format_num(arg);
 903                 if (ret < 0)
 904                         goto out;
 905                 ret = add_filter(ret, filter_name);
 906                 if (ret < 0)
 907                         goto out;
 908         }
 909         ret = init_default_filters(); /* use default values for the rest */
 910 out:
 911         return ret;
 912 }
 913
 914 static int parse_stream_args(void)
 915 {
 916         int ret;
 917
 918         ret = parse_receiver_args();
 919         if (ret < 0)
 920                 return ret;
 921         ret = parse_filter_args();
 922         if (ret < 0)
 923                 return ret;
 924         ret = parse_writer_args();
 925         if (ret < 0)
 926                 return ret;
 927         return 1;
 928 }
 929
 930 /* does not unlink socket on errors */
 931 static int audiod_get_socket(void)
 932 {
 933         struct sockaddr_un unix_addr;
 934         int ret, fd;
 935
 936         if (conf.socket_given)
 937                 socket_name = para_strdup(conf.socket_arg);
 938         else {
 939                 char *hn = para_hostname();
 940                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 941                         hn);
 942                 free(hn);
 943         }
 944         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 945         if (conf.force_given)
 946                 unlink(socket_name);
 947         ret = create_local_socket(socket_name, &unix_addr,
 948                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 949         if (ret < 0)
 950                 goto err;
 951         fd = ret;
 952         if (listen(fd , 5) < 0) {
 953                 ret = -ERRNO_TO_PARA_ERROR(errno);
 954                 goto err;
 955         }
 956         ret = mark_fd_nonblocking(fd);
 957         if (ret < 0)
 958                 goto err;
 959         return fd;
 960 err:
 961         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 962         exit(EXIT_FAILURE);
 963 }
 964
 965 static void signal_pre_select(struct sched *s, struct task *t)
 966 {
 967         struct signal_task *st = container_of(t, struct signal_task, task);
 968         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 969 }
 970
 971 static void signal_post_select(struct sched *s, struct task *t)
 972 {
 973         struct signal_task *st = container_of(t, struct signal_task, task);
 974
 975         if (!FD_ISSET(st->fd, &s->rfds))
 976                 return;
 977
 978         st->signum = para_next_signal();
 979         switch (st->signum) {
 980         case SIGINT:
 981         case SIGTERM:
 982         case SIGHUP:
 983                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 984                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 985         }
 986 }
 987
 988 static void signal_setup_default(struct signal_task *st)
 989 {
 990         st->task.pre_select = signal_pre_select;
 991         st->task.post_select = signal_post_select;
 992         sprintf(st->task.status, "signal task");
 993 }
 994
 995 static void command_pre_select(struct sched *s, struct task *t)
 996 {
 997         struct command_task *ct = container_of(t, struct command_task, task);
 998         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 999 }
1000
1001 static void command_post_select(struct sched *s, struct task *t)
1002 {
1003         int ret;
1004         struct command_task *ct = container_of(t, struct command_task, task);
1005         static struct timeval last_status_dump;
1006         struct timeval tmp, delay = {0, 500 * 1000};
1007
1008         tv_add(&last_status_dump, &delay, &tmp);
1009         if (tv_diff(&tmp, now, NULL) < 0) {
1010                 audiod_status_dump();
1011                 last_status_dump = *now;
1012         }
1013
1014         if (!FD_ISSET(ct->fd, &s->rfds))
1015                 return;
1016         ret = handle_connect(ct->fd);
1017         if (ret < 0)
1018                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1019 }
1020
1021 static void init_command_task(struct command_task *ct)
1022 {
1023         ct->task.pre_select = command_pre_select;
1024         ct->task.post_select = command_post_select;
1025         ct->task.error = 0;
1026         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1027         sprintf(ct->task.status, "command task");
1028 }
1029
1030 static void close_stat_pipe(void)
1031 {
1032         if (!stat_task->ct)
1033                 return;
1034         client_close(stat_task->ct);
1035         stat_task->ct = NULL;
1036         clear_and_dump_items();
1037         stat_task->length_seconds = 0;
1038         stat_task->offset_seconds = 0;
1039         stat_task->vss_status = 0;
1040         stat_task->current_audio_format_num = -1;
1041         audiod_status_dump();
1042 }
1043
1044 /**
1045  * close the connection to para_server and exit
1046  *
1047  * \param status the exit status which is passed to exit(3)
1048  * \param msg the log message
1049  *
1050  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1051  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1052  * EXIT_FAILURE.
1053  *
1054  * \sa exit(3)
1055  */
1056 void __noreturn clean_exit(int status, const char *msg)
1057 {
1058         PARA_EMERG_LOG("%s\n", msg);
1059         if (socket_name)
1060                 unlink(socket_name);
1061         close_stat_pipe();
1062         exit(status);
1063 }
1064
1065 /* avoid busy loop if server is down */
1066 static void set_stat_task_restart_barrier(unsigned seconds)
1067 {
1068         struct timeval delay = {seconds, 0};
1069         tv_add(now, &delay, &stat_task->restart_barrier);
1070 }
1071
1072 static bool try_to_close_slot(int slot_num)
1073 {
1074         struct slot_info *s = &slot[slot_num];
1075         struct audio_format_info *a = afi + s->format;
1076         int i;
1077
1078         if (s->format < 0)
1079                 return false;
1080         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1081                 return false;
1082         for (i = 0; i < a->num_filters; i++)
1083                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1084                         return false;
1085         if (a->num_writers > 0) {
1086                 for (i = 0; i < a->num_writers; i++)
1087                         if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1088                                 return false;
1089         } else {
1090                 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1091                         return false;
1092         }
1093         PARA_INFO_LOG("closing slot %d\n", slot_num);
1094         close_writers(s);
1095         close_filters(s);
1096         close_receiver(slot_num);
1097         clear_slot(slot_num);
1098         return true;
1099 }
1100
1101 /*
1102  * Check if any receivers/filters/writers need to be started and do so if
1103  * necessary.
1104  */
1105 static void start_stop_decoders(struct sched *s)
1106 {
1107         int i, ret;
1108         struct slot_info *sl;
1109         struct audio_format_info *a;
1110
1111         FOR_EACH_SLOT(i)
1112                 if (try_to_close_slot(i))
1113                         sched_min_delay(s);
1114         if (audiod_status != AUDIOD_ON ||
1115                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1116                 return kill_all_decoders(-E_NOT_PLAYING);
1117         ret = open_current_receiver(s);
1118         if (ret < 0)
1119                 return;
1120         sl = slot + ret;
1121         a = afi + sl->format;
1122         if (a->num_filters)
1123                 open_filters(sl);
1124         open_writers(sl);
1125         activate_grab_clients();
1126         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1127         sched_min_delay(s);
1128 }
1129
1130 /* restart the client task if necessary */
1131 static void status_pre_select(struct sched *s, struct task *t)
1132 {
1133         struct status_task *st = container_of(t, struct status_task, task);
1134
1135         if (audiod_status == AUDIOD_OFF) {
1136                 if (!st->ct)
1137                         goto out;
1138                 if (st->ct->task.error >= 0) {
1139                         st->ct->task.error = -E_AUDIOD_OFF;
1140                         goto out;
1141                 }
1142                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1143                         goto out;
1144                 close_stat_pipe();
1145                 st->clock_diff_count = conf.clock_diff_count_arg;
1146                 goto out;
1147         }
1148         if (st->ct) {
1149                 int ret;
1150                 if (st->ct->task.error < 0) {
1151                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1152                                 goto out;
1153                         close_stat_pipe();
1154                         goto out;
1155                 }
1156                 if (st->ct->status != CL_RECEIVING)
1157                         goto out;
1158                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1159                         update_item);
1160                 if (ret < 0) {
1161                         st->ct->task.error = ret;
1162                         goto out;
1163                 }
1164                 if (st->ct->loaded != ret) {
1165                         st->last_status_read = *now;
1166                         st->ct->loaded = ret;
1167                 } else {
1168                         struct timeval diff;
1169                         tv_diff(now, &st->last_status_read, &diff);
1170                         if (diff.tv_sec > 61)
1171                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1172                 }
1173                 goto out;
1174         }
1175         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1176                 goto out;
1177         if (st->clock_diff_count) { /* get status only one time */
1178                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1179                 int argc = 5;
1180                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1181                 st->clock_diff_count--;
1182                 client_open(argc, argv, &st->ct, NULL);
1183                 set_stat_task_restart_barrier(2);
1184                 sched_min_delay(s);
1185
1186         } else {
1187                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1188                 int argc = 4;
1189                 client_open(argc, argv, &st->ct, NULL);
1190                 set_stat_task_restart_barrier(5);
1191                 sched_min_delay(s);
1192         }
1193         free(stat_item_values[SI_BASENAME]);
1194         stat_item_values[SI_BASENAME] = para_strdup(
1195                 "no connection to para_server");
1196         stat_client_write_item(SI_BASENAME);
1197         st->last_status_read = *now;
1198 out:
1199         start_stop_decoders(s);
1200 }
1201
1202 static void init_status_task(struct status_task *st)
1203 {
1204         memset(st, 0, sizeof(struct status_task));
1205         st->task.pre_select = status_pre_select;
1206         st->sa_time_diff_sign = 1;
1207         st->clock_diff_count = conf.clock_diff_count_arg;
1208         st->current_audio_format_num = -1;
1209         sprintf(st->task.status, "status task");
1210 }
1211
1212 static void set_initial_status(void)
1213 {
1214         audiod_status = AUDIOD_ON;
1215         if (!conf.mode_given)
1216                 return;
1217         if (!strcmp(conf.mode_arg, "sb")) {
1218                 audiod_status = AUDIOD_STANDBY;
1219                 return;
1220         }
1221         if (!strcmp(conf.mode_arg, "off")) {
1222                 audiod_status = AUDIOD_OFF;
1223                 return;
1224         }
1225         if (strcmp(conf.mode_arg, "on"))
1226                 PARA_WARNING_LOG("invalid mode\n");
1227 }
1228
1229 __noreturn static void print_help_and_die(void)
1230 {
1231         int d = conf.detailed_help_given;
1232         const char **p = d? audiod_args_info_detailed_help
1233                 : audiod_args_info_help;
1234
1235         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1236                 AUDIOD_CMDLINE_PARSER_VERSION);
1237         printf_or_die("%s\n\n", audiod_args_info_usage);
1238         for (; *p; p++)
1239                 printf_or_die("%s\n", *p);
1240         print_receiver_helps(d);
1241         print_filter_helps(d);
1242         print_writer_helps(d);
1243         exit(0);
1244 }
1245
1246 static void init_colors_or_die(void)
1247 {
1248         int ret, i;
1249
1250         if (!want_colors())
1251                 return;
1252         daemon_set_default_log_colors();
1253         daemon_set_flag(DF_COLOR_LOG);
1254         for (i = 0; i < conf.log_color_given; i++) {
1255                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1256                 if (ret < 0)
1257                         exit(EXIT_FAILURE);
1258         }
1259 }
1260
1261 /**
1262  * the main function of para_audiod
1263  *
1264  * \param argc usual argument count
1265  * \param argv usual argument vector
1266  *
1267  * \return EXIT_SUCCESS or EXIT_FAILURE
1268  *
1269  * \sa para_audiod(1)
1270  * */
1271 int main(int argc, char *argv[])
1272 {
1273         int ret, i;
1274         static struct sched s;
1275         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1276         struct audiod_cmdline_parser_params params = {
1277                 .override = 0,
1278                 .initialize = 1,
1279                 .check_required = 0,
1280                 .check_ambiguity = 0,
1281                 .print_errors = 1
1282         };
1283
1284         valid_fd_012();
1285         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1286                 exit(EXIT_FAILURE);
1287         HANDLE_VERSION_FLAG("audiod", conf);
1288         /* init receivers/filters/writers early to make help work */
1289         recv_init();
1290         filter_init();
1291         writer_init();
1292         if (conf.help_given || conf.detailed_help_given)
1293                 print_help_and_die();
1294         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1295         parse_config_or_die();
1296         init_colors_or_die();
1297         init_random_seed_or_die();
1298         daemon_set_flag(DF_LOG_TIME);
1299         daemon_set_flag(DF_LOG_HOSTNAME);
1300         daemon_set_flag(DF_LOG_LL);
1301         if (conf.log_timing_given)
1302                 daemon_set_flag(DF_LOG_TIMING);
1303         if (conf.logfile_given) {
1304                 daemon_set_logfile(conf.logfile_arg);
1305                 daemon_open_log_or_die();
1306         }
1307         ret = parse_stream_args();
1308         if (ret < 0) {
1309                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1310                 exit(EXIT_FAILURE);
1311         }
1312         log_welcome("para_audiod");
1313         server_uptime(UPTIME_SET);
1314         set_initial_status();
1315         FOR_EACH_SLOT(i)
1316                 clear_slot(i);
1317         setup_signal_handling();
1318         signal_setup_default(sig_task);
1319
1320         init_status_task(stat_task);
1321         init_command_task(cmd_task);
1322
1323         if (conf.daemon_given)
1324                 daemonize();
1325
1326         register_task(&sig_task->task);
1327         register_task(&cmd_task->task);
1328         register_task(&stat_task->task);
1329         s.default_timeout.tv_sec = 2;
1330         s.default_timeout.tv_usec = 999 * 1000;
1331         ret = schedule(&s);
1332
1333         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1334         return EXIT_FAILURE;
1335 }