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         assert(s->wns);
 361         a = afi + s->format;
 362         if (a->num_writers == 0)
 363                 writer_cleanup(s->wns);
 364         else {
 365                 for (i = 0; i < a->num_writers; i++)
 366                         writer_cleanup(s->wns + i);
 367         }
 368         free(s->wns);
 369         s->wns = NULL;
 370 }
 371
 372 static void close_filters(struct slot_info *s)
 373 {
 374         int i;
 375         struct audio_format_info *a = afi + s->format;
 376         if (a->num_filters == 0)
 377                 return;
 378         for (i = 0; i < a->num_filters; i++) {
 379                 struct filter_node *fn = s->fns + i;
 380                 struct filter *f;
 381
 382                 if (!fn)
 383                         continue;
 384                 f = filters + fn->filter_num;
 385                 if (f->close)
 386                         f->close(fn);
 387                 btr_free_node(fn->btrn);
 388         }
 389         free(s->fns);
 390         s->fns = NULL;
 391 }
 392
 393 /*
 394  * Whenever a task commits suicide by returning from post_select with t->error
 395  * < 0, it also removes its btr node. We do exactly that to kill a running
 396  * task. Note that the scheduler checks t->error also _before_ each pre/post
 397  * select call, so the victim will never be scheduled again.
 398  */
 399 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
 400 {
 401         if (t->error < 0)
 402                 return;
 403         t->error = error;
 404         btr_remove_node(btrn);
 405 }
 406
 407 static void kill_all_decoders(int error)
 408 {
 409         int i, j;
 410
 411         FOR_EACH_SLOT(i) {
 412                 struct slot_info *s = &slot[i];
 413                 struct audio_format_info *a;
 414                 if (s->format < 0)
 415                         continue;
 416                 a = afi + s->format;
 417                 if (s->wns)
 418                         for (j = 0; j < a->num_writers; j++)
 419                                 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
 420                 if (s->fns)
 421                         for (j = 0; j < a->num_writers; j++)
 422                                 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
 423                 if (s->receiver_node)
 424                         kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
 425                                 error);
 426         }
 427 }
 428
 429 static int get_empty_slot(void)
 430 {
 431         int i;
 432         struct slot_info *s;
 433
 434         FOR_EACH_SLOT(i) {
 435                 s = &slot[i];
 436                 if (s->format < 0) {
 437                         clear_slot(i);
 438                         return i;
 439                 }
 440                 if (s->wns || s->receiver_node || s->fns)
 441                         continue;
 442                 clear_slot(i);
 443                 return i;
 444         }
 445         return -E_NO_MORE_SLOTS;
 446 }
 447
 448 /**
 449  * get the number of filters
 450  *
 451  * \param audio_format_num the number identifying the audio format
 452  *
 453  * \return the number of filters for the given audio format
 454  *
 455  * \sa struct filter;
 456  */
 457 int num_filters(int audio_format_num)
 458 {
 459         return afi[audio_format_num].num_filters;
 460 }
 461
 462 static void open_filters(struct slot_info *s)
 463 {
 464         struct audio_format_info *a = afi + s->format;
 465         struct filter_node *fn;
 466         int nf = a->num_filters;
 467         struct btr_node *parent;
 468         int i;
 469
 470         if (nf == 0)
 471                 return;
 472         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 473         assert(s->fns == NULL);
 474         s->fns = para_calloc(nf * sizeof(struct filter_node));
 475         parent = s->receiver_node->btrn;
 476         for (i = 0; i < nf; i++) {
 477                 struct filter *f = filters + a->filter_nums[i];
 478                 fn = s->fns + i;
 479                 fn->filter_num = a->filter_nums[i];
 480                 fn->conf = a->filter_conf[i];
 481                 fn->task.pre_select = f->pre_select;
 482                 fn->task.post_select = f->post_select;
 483
 484                 fn->btrn = btr_new_node(&(struct btr_node_description)
 485                         EMBRACE(.name = f->name, .parent = parent,
 486                                 .handler = f->execute, .context = fn));
 487
 488                 f->open(fn);
 489                 register_task(&fn->task);
 490                 parent = fn->btrn;
 491                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 492                         audio_formats[s->format], i,  nf, f->name, s - slot);
 493                 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
 494         }
 495 }
 496
 497 static void open_writers(struct slot_info *s)
 498 {
 499         int i;
 500         struct audio_format_info *a = afi + s->format;
 501         struct writer_node *wn;
 502         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 503
 504         assert(s->wns == NULL);
 505         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 506                 * sizeof(struct writer_node));
 507         if (a->num_writers == 0)
 508                 setup_writer_node(NULL, parent, s->wns);
 509         else {
 510                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 511                 for (i = 0; i < a->num_writers; i++) {
 512                         wn = s->wns + i;
 513                         wn->conf = a->writer_conf[i];
 514                         wn->writer_num = a->writer_nums[i];
 515                         register_writer_node(wn, parent);
 516                 }
 517         }
 518 }
 519
 520 /* returns slot num on success */
 521 static int open_receiver(int format)
 522 {
 523         struct audio_format_info *a = &afi[format];
 524         struct slot_info *s;
 525         int ret, slot_num;
 526         struct receiver *r = a->receiver;
 527         struct receiver_node *rn;
 528         const struct timeval restart_delay = {2, 0};
 529
 530         ret = get_empty_slot();
 531         if (ret < 0)
 532                 goto err;
 533         slot_num = ret;
 534         s = &slot[slot_num];
 535         s->format = format;
 536         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 537         rn = s->receiver_node;
 538         rn->receiver = r;
 539         rn->conf = a->receiver_conf;
 540         rn->btrn = btr_new_node(&(struct btr_node_description)
 541                 EMBRACE(.name = r->name, .context = rn));
 542         ret = r->open(rn);
 543         if (ret < 0) {
 544                 btr_free_node(rn->btrn);
 545                 free(rn);
 546                 s->receiver_node = NULL;
 547                 goto err;
 548         }
 549         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 550                 audio_formats[s->format], r->name, slot_num);
 551         rn->task.pre_select = r->pre_select;
 552         rn->task.post_select = r->post_select;
 553         sprintf(rn->task.status, "%s receiver node", r->name);
 554         register_task(&rn->task);
 555         ret = slot_num;
 556 err:
 557         if (ret < 0)
 558                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 559         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 560         return ret;
 561 }
 562
 563 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 564 static int receiver_running(int format)
 565 {
 566         int i, ret = 0;
 567
 568         FOR_EACH_SLOT(i) {
 569                 struct slot_info *s = &slot[i];
 570                 if (s->format != format)
 571                         continue;
 572                 if (!s->receiver_node)
 573                         continue;
 574                 if (s->receiver_node->task.error >= 0)
 575                         return 1;
 576                 ret = -1;
 577         }
 578         return ret;
 579 }
 580
 581 struct btr_node *audiod_get_btr_root(void)
 582 {
 583         int i, newest_slot = -1;
 584         struct timeval newest_rstime = {0, 0};
 585
 586         FOR_EACH_SLOT(i) {
 587                 struct slot_info *s = &slot[i];
 588                 struct timeval rstime;
 589                 if (!s->receiver_node)
 590                         continue;
 591                 if (s->receiver_node->task.error < 0)
 592                         continue;
 593                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 594                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 595                         continue;
 596                 newest_rstime = rstime;
 597                 newest_slot = i;
 598         }
 599         if (newest_slot == -1)
 600                 return NULL;
 601         return slot[newest_slot].receiver_node->btrn;
 602 }
 603
 604 /* returns slot num on success. */
 605 static int open_current_receiver(struct sched *s)
 606 {
 607         struct timeval diff;
 608         int ret, cafn = stat_task->current_audio_format_num;
 609
 610         if (cafn < 0 || !stat_task->ct)
 611                 return -1;
 612         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 613         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 614                 return -1;
 615         ret = receiver_running(cafn);
 616         if (ret > 0) /* already running and not eof */
 617                 return -1;
 618         if (ret < 0) { /* eof */
 619                 /*
 620                  * para_server uses a zero start time during the announcement
 621                  * period, i.e. before it sends the first chunk. Wait until
 622                  * this period begins to avoid restarting the receiver that
 623                  * belongs to the file just completed.
 624                  */
 625                 if (stat_task->server_stream_start.tv_sec != 0) {
 626                         sched_request_timeout_ms(100, s);
 627                         return -1;
 628                 }
 629         }
 630         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 631                 if (tv_diff(&s->timeout, &diff, NULL) > 0)
 632                         sched_request_timeout(&diff, s);
 633                 else
 634                         sched_min_delay(s);
 635                 return -1;
 636         }
 637         /* start a new receiver */
 638         return open_receiver(cafn);
 639 }
 640
 641 static unsigned compute_time_diff(const struct timeval *status_time)
 642 {
 643         struct timeval tmp, diff;
 644         static unsigned count;
 645         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 646         const struct timeval max_deviation = {0, 500 * 1000};
 647         const int time_smooth = 5;
 648
 649         if (!status_time)
 650                 return count;
 651         sign = tv_diff(status_time, now, &diff);
 652 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 653 //                      sign, sa_time_diff_sign);
 654         if (!count) {
 655                 sa_time_diff_sign = sign;
 656                 stat_task->sa_time_diff = diff;
 657                 count++;
 658                 goto out;
 659         }
 660         if (count > 5) {
 661                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 662                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 663                         PARA_WARNING_LOG("time diff jump: %lims\n",
 664                                 s * tv2ms(&tmp));
 665         }
 666         count++;
 667         sa_time_diff_sign = tv_convex_combination(
 668                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 669                 count > 10? sign : sign * time_smooth, &diff,
 670                 &tmp);
 671         stat_task->sa_time_diff = tmp;
 672         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 673                 sign > 0? "+" : "-",
 674                 tv2ms(&diff),
 675                 sa_time_diff_sign ? "+" : "-",
 676                 tv2ms(&stat_task->sa_time_diff)
 677         );
 678 out:
 679         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 680         return count;
 681 }
 682
 683 static int update_item(int itemnum, char *buf)
 684 {
 685         long unsigned sec, usec;
 686
 687         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 688                 return 1;
 689         free(stat_item_values[itemnum]);
 690         stat_item_values[itemnum] = para_strdup(buf);
 691         stat_client_write_item(itemnum);
 692         switch (itemnum) {
 693         case SI_STATUS_FLAGS:
 694                 stat_task->vss_status = 0;
 695                 if (strchr(buf, 'N'))
 696                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 697                 if (strchr(buf, 'P'))
 698                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 699                 break;
 700         case SI_OFFSET:
 701                 stat_task->offset_seconds = atoi(buf);
 702                 break;
 703         case SI_SECONDS_TOTAL:
 704                 stat_task->length_seconds = atoi(buf);
 705                 break;
 706         case SI_STREAM_START:
 707                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 708                         struct timeval a_start, delay;
 709                         delay.tv_sec = conf.stream_delay_arg / 1000;
 710                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 711                         stat_task->server_stream_start.tv_sec = sec;
 712                         stat_task->server_stream_start.tv_usec = usec;
 713                         if (compute_time_diff(NULL) > 2) {
 714                                 if (stat_task->sa_time_diff_sign < 0)
 715                                         tv_add(&stat_task->server_stream_start,
 716                                                 &stat_task->sa_time_diff, &a_start);
 717                                 else
 718                                         tv_diff(&stat_task->server_stream_start,
 719                                                 &stat_task->sa_time_diff, &a_start);
 720                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 721                         }
 722                 }
 723                 break;
 724         case SI_CURRENT_TIME:
 725                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 726                         struct timeval tv = {sec, usec};
 727                         compute_time_diff(&tv);
 728                 }
 729                 break;
 730         case SI_FORMAT:
 731                 stat_task->current_audio_format_num
 732                         = get_audio_format_num(buf);
 733         }
 734         return 1;
 735 }
 736
 737 static int parse_stream_command(const char *txt, char **cmd)
 738 {
 739         char *p = strchr(txt, ':');
 740         int i;
 741
 742         if (!p)
 743                 return -E_MISSING_COLON;
 744         p++;
 745         FOR_EACH_AUDIO_FORMAT(i) {
 746                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 747                         continue;
 748                 *cmd = p;
 749                 return i;
 750         }
 751         return -E_UNSUPPORTED_AUDIO_FORMAT;
 752 }
 753
 754 static int add_filter(int format, char *cmdline)
 755 {
 756         struct audio_format_info *a = &afi[format];
 757         int filter_num, nf = a->num_filters;
 758
 759         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 760         if (filter_num < 0)
 761                 return filter_num;
 762         a->filter_nums[nf] = filter_num;
 763         a->num_filters++;
 764         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 765                 filters[filter_num].name);
 766         return filter_num;
 767 }
 768
 769 static int parse_writer_args(void)
 770 {
 771         int i, ret, nw;
 772         char *cmd;
 773         struct audio_format_info *a;
 774
 775         nw = PARA_MAX(1U, conf.writer_given);
 776         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 777         FOR_EACH_AUDIO_FORMAT(i) {
 778                 a = &afi[i];
 779                 a->writer_conf = para_malloc(nw * sizeof(void *));
 780                 a->writer_nums = para_malloc(nw * sizeof(int));
 781                 a->num_writers = 0;
 782         }
 783         for (i = 0; i < conf.writer_given; i++) {
 784                 void *wconf;
 785                 int writer_num;
 786                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 787                 if (ret < 0)
 788                         goto out;
 789                 a = &afi[ret];
 790                 nw = a->num_writers;
 791                 wconf = check_writer_arg(cmd, &writer_num);
 792                 if (!wconf) {
 793                         ret = writer_num;
 794                         goto out;
 795                 }
 796                 a->writer_nums[nw] = writer_num;
 797                 a->writer_conf[nw] = wconf;
 798                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 799                         nw, writer_names[writer_num]);
 800                 a->num_writers++;
 801         }
 802         ret = 1;
 803 out:
 804         return ret;
 805 }
 806
 807 static int parse_receiver_args(void)
 808 {
 809         int i, ret, receiver_num;
 810         char *cmd = NULL;
 811         struct audio_format_info *a;
 812
 813         for (i = conf.receiver_given - 1; i >= 0; i--) {
 814                 char *arg = conf.receiver_arg[i];
 815                 char *recv_arg = strchr(arg, ':');
 816                 ret = -E_MISSING_COLON;
 817                 if (!recv_arg)
 818                         goto out;
 819                 *recv_arg = '\0';
 820                 recv_arg++;
 821                 ret = get_audio_format_num(arg);
 822                 if (ret < 0)
 823                         goto out;
 824                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 825                 if (!afi[ret].receiver_conf) {
 826                         ret = -E_RECV_SYNTAX;
 827                         goto out;
 828                 }
 829                 afi[ret].receiver = &receivers[receiver_num];
 830         }
 831         /* use the first available receiver with no arguments
 832          * for those audio formats for which no receiver
 833          * was specified
 834          */
 835         cmd = para_strdup(receivers[0].name);
 836         FOR_EACH_AUDIO_FORMAT(i) {
 837                 a = &afi[i];
 838                 if (a->receiver_conf)
 839                         continue;
 840                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 841                 if (!a->receiver_conf)
 842                         return -E_RECV_SYNTAX;
 843                 a->receiver = &receivers[receiver_num];
 844         }
 845         ret = 1;
 846 out:
 847         free(cmd);
 848         return ret;
 849 }
 850
 851 static int init_default_filters(void)
 852 {
 853         int i, ret = 1;
 854
 855         FOR_EACH_AUDIO_FORMAT(i) {
 856                 struct audio_format_info *a = &afi[i];
 857                 char *tmp;
 858                 int j;
 859
 860                 if (a->num_filters)
 861                         continue; /* no default -- nothing to to */
 862                 /* add "dec" to audio format name */
 863                 tmp = make_message("%sdec", audio_formats[i]);
 864                 for (j = 0; filters[j].name; j++)
 865                         if (!strcmp(tmp, filters[j].name))
 866                                 break;
 867                 free(tmp);
 868                 ret = -E_UNSUPPORTED_FILTER;
 869                 if (!filters[j].name)
 870                         goto out;
 871                 tmp = para_strdup(filters[j].name);
 872                 ret = add_filter(i, tmp);
 873                 free(tmp);
 874                 if (ret < 0)
 875                         goto out;
 876                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 877                         filters[j].name);
 878         }
 879 out:
 880         return ret;
 881 }
 882
 883 static int parse_filter_args(void)
 884 {
 885         int i, ret, nf;
 886
 887         nf = PARA_MAX(1U, conf.filter_given);
 888         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 889         FOR_EACH_AUDIO_FORMAT(i) {
 890                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 891                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 892         }
 893         if (!conf.no_default_filters_given)
 894                 return init_default_filters();
 895         for (i = 0; i < conf.filter_given; i++) {
 896                 char *arg = conf.filter_arg[i];
 897                 char *filter_name = strchr(arg, ':');
 898                 ret = -E_MISSING_COLON;
 899                 if (!filter_name)
 900                         goto out;
 901                 *filter_name = '\0';
 902                 filter_name++;
 903                 ret = get_audio_format_num(arg);
 904                 if (ret < 0)
 905                         goto out;
 906                 ret = add_filter(ret, filter_name);
 907                 if (ret < 0)
 908                         goto out;
 909         }
 910         ret = init_default_filters(); /* use default values for the rest */
 911 out:
 912         return ret;
 913 }
 914
 915 static int parse_stream_args(void)
 916 {
 917         int ret;
 918
 919         ret = parse_receiver_args();
 920         if (ret < 0)
 921                 return ret;
 922         ret = parse_filter_args();
 923         if (ret < 0)
 924                 return ret;
 925         ret = parse_writer_args();
 926         if (ret < 0)
 927                 return ret;
 928         return 1;
 929 }
 930
 931 /* does not unlink socket on errors */
 932 static int audiod_get_socket(void)
 933 {
 934         struct sockaddr_un unix_addr;
 935         int ret, fd;
 936
 937         if (conf.socket_given)
 938                 socket_name = para_strdup(conf.socket_arg);
 939         else {
 940                 char *hn = para_hostname();
 941                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 942                         hn);
 943                 free(hn);
 944         }
 945         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 946         if (conf.force_given)
 947                 unlink(socket_name);
 948         ret = create_local_socket(socket_name, &unix_addr,
 949                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 950         if (ret < 0)
 951                 goto err;
 952         fd = ret;
 953         if (listen(fd , 5) < 0) {
 954                 ret = -ERRNO_TO_PARA_ERROR(errno);
 955                 goto err;
 956         }
 957         ret = mark_fd_nonblocking(fd);
 958         if (ret < 0)
 959                 goto err;
 960         return fd;
 961 err:
 962         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 963         exit(EXIT_FAILURE);
 964 }
 965
 966 static void signal_pre_select(struct sched *s, struct task *t)
 967 {
 968         struct signal_task *st = container_of(t, struct signal_task, task);
 969         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 970 }
 971
 972 static void signal_post_select(struct sched *s, struct task *t)
 973 {
 974         struct signal_task *st = container_of(t, struct signal_task, task);
 975
 976         if (!FD_ISSET(st->fd, &s->rfds))
 977                 return;
 978
 979         st->signum = para_next_signal();
 980         switch (st->signum) {
 981         case SIGINT:
 982         case SIGTERM:
 983         case SIGHUP:
 984                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 985                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 986         }
 987 }
 988
 989 static void signal_setup_default(struct signal_task *st)
 990 {
 991         st->task.pre_select = signal_pre_select;
 992         st->task.post_select = signal_post_select;
 993         sprintf(st->task.status, "signal task");
 994 }
 995
 996 static void command_pre_select(struct sched *s, struct task *t)
 997 {
 998         struct command_task *ct = container_of(t, struct command_task, task);
 999         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1000 }
1001
1002 static void command_post_select(struct sched *s, struct task *t)
1003 {
1004         int ret;
1005         struct command_task *ct = container_of(t, struct command_task, task);
1006         static struct timeval last_status_dump;
1007         struct timeval tmp, delay = {0, 500 * 1000};
1008
1009         tv_add(&last_status_dump, &delay, &tmp);
1010         if (tv_diff(&tmp, now, NULL) < 0) {
1011                 audiod_status_dump();
1012                 last_status_dump = *now;
1013         }
1014
1015         if (!FD_ISSET(ct->fd, &s->rfds))
1016                 return;
1017         ret = handle_connect(ct->fd);
1018         if (ret < 0)
1019                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1020 }
1021
1022 static void init_command_task(struct command_task *ct)
1023 {
1024         ct->task.pre_select = command_pre_select;
1025         ct->task.post_select = command_post_select;
1026         ct->task.error = 0;
1027         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1028         sprintf(ct->task.status, "command task");
1029 }
1030
1031 static void close_stat_pipe(void)
1032 {
1033         if (!stat_task->ct)
1034                 return;
1035         client_close(stat_task->ct);
1036         stat_task->ct = NULL;
1037         clear_and_dump_items();
1038         stat_task->length_seconds = 0;
1039         stat_task->offset_seconds = 0;
1040         stat_task->vss_status = 0;
1041         stat_task->current_audio_format_num = -1;
1042         audiod_status_dump();
1043 }
1044
1045 /**
1046  * close the connection to para_server and exit
1047  *
1048  * \param status the exit status which is passed to exit(3)
1049  * \param msg the log message
1050  *
1051  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1052  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1053  * EXIT_FAILURE.
1054  *
1055  * \sa exit(3)
1056  */
1057 void __noreturn clean_exit(int status, const char *msg)
1058 {
1059         PARA_EMERG_LOG("%s\n", msg);
1060         if (socket_name)
1061                 unlink(socket_name);
1062         close_stat_pipe();
1063         exit(status);
1064 }
1065
1066 /* avoid busy loop if server is down */
1067 static void set_stat_task_restart_barrier(unsigned seconds)
1068 {
1069         struct timeval delay = {seconds, 0};
1070         tv_add(now, &delay, &stat_task->restart_barrier);
1071 }
1072
1073 static bool try_to_close_slot(int slot_num)
1074 {
1075         struct slot_info *s = &slot[slot_num];
1076         struct audio_format_info *a = afi + s->format;
1077         int i;
1078
1079         if (s->format < 0)
1080                 return false;
1081         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1082                 return false;
1083         for (i = 0; i < a->num_filters; i++)
1084                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1085                         return false;
1086         if (a->num_writers > 0) {
1087                 for (i = 0; i < a->num_writers; i++)
1088                         if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1089                                 return false;
1090         } else {
1091                 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1092                         return false;
1093         }
1094         PARA_INFO_LOG("closing slot %d\n", slot_num);
1095         close_writers(s);
1096         close_filters(s);
1097         close_receiver(slot_num);
1098         clear_slot(slot_num);
1099         return true;
1100 }
1101
1102 /*
1103  * Check if any receivers/filters/writers need to be started and do so if
1104  * necessary.
1105  */
1106 static void start_stop_decoders(struct sched *s)
1107 {
1108         int i, ret;
1109         struct slot_info *sl;
1110         struct audio_format_info *a;
1111
1112         FOR_EACH_SLOT(i)
1113                 if (try_to_close_slot(i))
1114                         sched_min_delay(s);
1115         if (audiod_status != AUDIOD_ON ||
1116                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1117                 return kill_all_decoders(-E_NOT_PLAYING);
1118         ret = open_current_receiver(s);
1119         if (ret < 0)
1120                 return;
1121         sl = slot + ret;
1122         a = afi + sl->format;
1123         if (a->num_filters)
1124                 open_filters(sl);
1125         open_writers(sl);
1126         activate_grab_clients();
1127         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1128         sched_min_delay(s);
1129 }
1130
1131 /* restart the client task if necessary */
1132 static void status_pre_select(struct sched *s, struct task *t)
1133 {
1134         struct status_task *st = container_of(t, struct status_task, task);
1135
1136         if (audiod_status == AUDIOD_OFF) {
1137                 if (!st->ct)
1138                         goto out;
1139                 if (st->ct->task.error >= 0) {
1140                         st->ct->task.error = -E_AUDIOD_OFF;
1141                         goto out;
1142                 }
1143                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1144                         goto out;
1145                 close_stat_pipe();
1146                 st->clock_diff_count = conf.clock_diff_count_arg;
1147                 goto out;
1148         }
1149         if (st->ct) {
1150                 int ret;
1151                 if (st->ct->task.error < 0) {
1152                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1153                                 goto out;
1154                         close_stat_pipe();
1155                         goto out;
1156                 }
1157                 if (st->ct->status != CL_RECEIVING)
1158                         goto out;
1159                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1160                         update_item);
1161                 if (ret < 0) {
1162                         st->ct->task.error = ret;
1163                         goto out;
1164                 }
1165                 if (st->ct->loaded != ret) {
1166                         st->last_status_read = *now;
1167                         st->ct->loaded = ret;
1168                 } else {
1169                         struct timeval diff;
1170                         tv_diff(now, &st->last_status_read, &diff);
1171                         if (diff.tv_sec > 61)
1172                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1173                 }
1174                 goto out;
1175         }
1176         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1177                 goto out;
1178         if (st->clock_diff_count) { /* get status only one time */
1179                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1180                 int argc = 5;
1181                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1182                 st->clock_diff_count--;
1183                 client_open(argc, argv, &st->ct, NULL);
1184                 set_stat_task_restart_barrier(2);
1185                 sched_min_delay(s);
1186
1187         } else {
1188                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1189                 int argc = 4;
1190                 client_open(argc, argv, &st->ct, NULL);
1191                 set_stat_task_restart_barrier(5);
1192                 sched_min_delay(s);
1193         }
1194         free(stat_item_values[SI_BASENAME]);
1195         stat_item_values[SI_BASENAME] = para_strdup(
1196                 "no connection to para_server");
1197         stat_client_write_item(SI_BASENAME);
1198         st->last_status_read = *now;
1199 out:
1200         start_stop_decoders(s);
1201 }
1202
1203 static void init_status_task(struct status_task *st)
1204 {
1205         memset(st, 0, sizeof(struct status_task));
1206         st->task.pre_select = status_pre_select;
1207         st->sa_time_diff_sign = 1;
1208         st->clock_diff_count = conf.clock_diff_count_arg;
1209         st->current_audio_format_num = -1;
1210         sprintf(st->task.status, "status task");
1211 }
1212
1213 static void set_initial_status(void)
1214 {
1215         audiod_status = AUDIOD_ON;
1216         if (!conf.mode_given)
1217                 return;
1218         if (!strcmp(conf.mode_arg, "sb")) {
1219                 audiod_status = AUDIOD_STANDBY;
1220                 return;
1221         }
1222         if (!strcmp(conf.mode_arg, "off")) {
1223                 audiod_status = AUDIOD_OFF;
1224                 return;
1225         }
1226         if (strcmp(conf.mode_arg, "on"))
1227                 PARA_WARNING_LOG("invalid mode\n");
1228 }
1229
1230 __noreturn static void print_help_and_die(void)
1231 {
1232         int d = conf.detailed_help_given;
1233         const char **p = d? audiod_args_info_detailed_help
1234                 : audiod_args_info_help;
1235
1236         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1237                 AUDIOD_CMDLINE_PARSER_VERSION);
1238         printf_or_die("%s\n\n", audiod_args_info_usage);
1239         for (; *p; p++)
1240                 printf_or_die("%s\n", *p);
1241         print_receiver_helps(d);
1242         print_filter_helps(d);
1243         print_writer_helps(d);
1244         exit(0);
1245 }
1246
1247 static void init_colors_or_die(void)
1248 {
1249         int ret, i;
1250
1251         if (!want_colors())
1252                 return;
1253         daemon_set_default_log_colors();
1254         daemon_set_flag(DF_COLOR_LOG);
1255         for (i = 0; i < conf.log_color_given; i++) {
1256                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1257                 if (ret < 0)
1258                         exit(EXIT_FAILURE);
1259         }
1260 }
1261
1262 /**
1263  * the main function of para_audiod
1264  *
1265  * \param argc usual argument count
1266  * \param argv usual argument vector
1267  *
1268  * \return EXIT_SUCCESS or EXIT_FAILURE
1269  *
1270  * \sa para_audiod(1)
1271  * */
1272 int main(int argc, char *argv[])
1273 {
1274         int ret, i;
1275         static struct sched s;
1276         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1277         struct audiod_cmdline_parser_params params = {
1278                 .override = 0,
1279                 .initialize = 1,
1280                 .check_required = 0,
1281                 .check_ambiguity = 0,
1282                 .print_errors = 1
1283         };
1284
1285         valid_fd_012();
1286         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1287                 exit(EXIT_FAILURE);
1288         HANDLE_VERSION_FLAG("audiod", conf);
1289         /* init receivers/filters/writers early to make help work */
1290         recv_init();
1291         filter_init();
1292         writer_init();
1293         if (conf.help_given || conf.detailed_help_given)
1294                 print_help_and_die();
1295         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1296         parse_config_or_die();
1297         init_colors_or_die();
1298         init_random_seed_or_die();
1299         daemon_set_flag(DF_LOG_TIME);
1300         daemon_set_flag(DF_LOG_HOSTNAME);
1301         daemon_set_flag(DF_LOG_LL);
1302         if (conf.log_timing_given)
1303                 daemon_set_flag(DF_LOG_TIMING);
1304         if (conf.logfile_given) {
1305                 daemon_set_logfile(conf.logfile_arg);
1306                 daemon_open_log_or_die();
1307         }
1308         ret = parse_stream_args();
1309         if (ret < 0) {
1310                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1311                 exit(EXIT_FAILURE);
1312         }
1313         log_welcome("para_audiod");
1314         server_uptime(UPTIME_SET);
1315         set_initial_status();
1316         FOR_EACH_SLOT(i)
1317                 clear_slot(i);
1318         setup_signal_handling();
1319         signal_setup_default(sig_task);
1320
1321         init_status_task(stat_task);
1322         init_command_task(cmd_task);
1323
1324         if (conf.daemon_given)
1325                 daemonize();
1326
1327         register_task(&sig_task->task);
1328         register_task(&cmd_task->task);
1329         register_task(&stat_task->task);
1330         s.default_timeout.tv_sec = 2;
1331         s.default_timeout.tv_usec = 999 * 1000;
1332         ret = schedule(&s);
1333
1334         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1335         return EXIT_FAILURE;
1336 }