source.c 44.2 KB
Newer Older
1 2 3 4 5
/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
6
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org,
7 8 9 10
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
11
 * Copyright 2012-2018, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>,
12 13
 */

14
/* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */
15 16 17 18
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

Jack Moffitt's avatar
Jack Moffitt committed
19 20 21 22
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
23
#include <ogg/ogg.h>
Michael Smith's avatar
Michael Smith committed
24
#include <errno.h>
25

26
/* REVIEW: Are all those includes needed? */
27
#ifndef _WIN32
28
#include <unistd.h>
Jack Moffitt's avatar
Jack Moffitt committed
29
#include <sys/time.h>
30
#include <sys/socket.h>
31
#include <sys/wait.h>
32
#include <limits.h>
33 34 35
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
36
#else
37 38
#include <winsock2.h>
#include <windows.h>
39
#define snprintf _snprintf
40
#endif
Jack Moffitt's avatar
Jack Moffitt committed
41

Marvin Scholz's avatar
Marvin Scholz committed
42 43 44
#include "common/thread/thread.h"
#include "common/avl/avl.h"
#include "common/httpp/httpp.h"
Jack Moffitt's avatar
Jack Moffitt committed
45

46 47
#include "source.h"
#include "compat.h"
Jack Moffitt's avatar
Jack Moffitt committed
48 49 50 51
#include "connection.h"
#include "global.h"
#include "refbuf.h"
#include "client.h"
52
#include "errors.h"
Jack Moffitt's avatar
Jack Moffitt committed
53
#include "stats.h"
54
#include "logging.h"
55
#include "cfgfile.h"
56
#include "util.h"
Michael Smith's avatar
Michael Smith committed
57
#include "format.h"
58
#include "fserve.h"
Michael Smith's avatar
Michael Smith committed
59
#include "auth.h"
60
#include "event.h"
61 62
#include "slave.h"
#include "acl.h"
Jack Moffitt's avatar
Jack Moffitt committed
63

64 65 66
#undef CATMODULE
#define CATMODULE "source"

Michael Smith's avatar
Michael Smith committed
67 68
#define MAX_FALLBACK_DEPTH 10

69 70
mutex_t move_clients_mutex;

Jack Moffitt's avatar
Jack Moffitt committed
71 72 73
/* avl tree helper */
static int _compare_clients(void *compare_arg, void *a, void *b);
static int _free_client(void *key);
74
static void _parse_audio_info (source_t *source, const char *s);
Karl Heyes's avatar
Karl Heyes committed
75
static void source_shutdown (source_t *source);
Jack Moffitt's avatar
Jack Moffitt committed
76

77 78 79 80 81 82 83 84
/* Allocate a new source with the stated mountpoint, if one already
 * exists with that mountpoint in the global source tree then return
 * NULL.
 */
source_t *source_reserve (const char *mount)
{
    source_t *src = NULL;

85
    if(mount[0] != '/')
86
        ICECAST_LOG_WARN("Source at \"%s\" does not start with '/', clients will be "
87 88
                "unable to connect", mount);

89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104
    do
    {
        avl_tree_wlock (global.source_tree);
        src = source_find_mount_raw (mount);
        if (src)
        {
            src = NULL;
            break;
        }

        src = calloc (1, sizeof(source_t));
        if (src == NULL)
            break;

        src->client_tree = avl_tree_new(_compare_clients, NULL);
        src->pending_tree = avl_tree_new(_compare_clients, NULL);
105
        src->history = playlist_new(4 /* DOCUMENT: default is max_tracks=4. */);
106 107

        /* make duplicates for strings or similar */
108
        src->mount = strdup(mount);
109
        src->max_listeners = -1;
110
        thread_mutex_create(&src->lock);
111

112
        avl_insert(global.source_tree, src);
113 114 115

    } while (0);

116
    avl_tree_unlock(global.source_tree);
117 118 119 120
    return src;
}


Michael Smith's avatar
Michael Smith committed
121 122 123 124
/* Find a mount with this raw name - ignoring fallbacks. You should have the
 * global source tree locked to call this.
 */
source_t *source_find_mount_raw(const char *mount)
Jack Moffitt's avatar
Jack Moffitt committed
125
{
126 127 128 129 130 131 132 133 134
    source_t *source;
    avl_node *node;
    int cmp;

    if (!mount) {
        return NULL;
    }
    /* get the root node */
    node = global.source_tree->root->right;
135

136
    while (node) {
137
        source = (source_t *) node->key;
138
        cmp = strcmp(mount, source->mount);
139
        if (cmp < 0)
140 141 142 143 144 145
            node = node->left;
        else if (cmp > 0)
            node = node->right;
        else
            return source;
    }
146

147 148
    /* didn't find it */
    return NULL;
Jack Moffitt's avatar
Jack Moffitt committed
149 150
}

151 152

/* Search for mount, if the mount is there but not currently running then
Karl Heyes's avatar
Karl Heyes committed
153
 * check the fallback, and so on.  Must have a global source lock to call
154 155
 * this function.
 */
156
source_t *source_find_mount(const char *mount)
Michael Smith's avatar
Michael Smith committed
157
{
158
    source_t *source = NULL;
Michael Smith's avatar
Michael Smith committed
159
    ice_config_t *config;
160 161 162 163
    mount_proxy *mountinfo;
    int depth = 0;

    config = config_get_config();
164
    while (mount && depth < MAX_FALLBACK_DEPTH)
165 166
    {
        source = source_find_mount_raw(mount);
Michael Smith's avatar
Michael Smith committed
167

168 169 170 171 172
        if (source)
        {
            if (source->running || source->on_demand)
                break;
        }
Michael Smith's avatar
Michael Smith committed
173

174 175 176
        /* we either have a source which is not active (relay) or no source
         * at all. Check the mounts list for fallback settings
         */
177
        mountinfo = config_find_mount(config, mount, MOUNT_TYPE_NORMAL);
178
        source = NULL;
179 180 181 182

        if (mountinfo == NULL)
            break;
        mount = mountinfo->fallback_mount;
183
        depth++;
Michael Smith's avatar
Michael Smith committed
184 185
    }

186
    config_release_config();
Michael Smith's avatar
Michael Smith committed
187 188 189 190
    return source;
}


Jack Moffitt's avatar
Jack Moffitt committed
191 192
int source_compare_sources(void *arg, void *a, void *b)
{
193 194
    source_t *srca = (source_t *)a;
    source_t *srcb = (source_t *)b;
Jack Moffitt's avatar
Jack Moffitt committed
195

196 197
    (void)arg;

198
    return strcmp(srca->mount, srcb->mount);
Jack Moffitt's avatar
Jack Moffitt committed
199 200
}

201 202 203

void source_clear_source (source_t *source)
{
204 205
    int c;

206
    ICECAST_LOG_DEBUG("clearing source \"%s\"", source->mount);
207

208
    avl_tree_wlock (source->pending_tree);
209 210
    client_destroy(source->client);
    source->client = NULL;
211 212
    source->parser = NULL;
    source->con = NULL;
213

214 215 216 217
    /* log bytes read in access log */
    if (source->client && source->format)
        source->client->con->sent_bytes = source->format->read_bytes;

218 219
    if (source->dumpfile)
    {
220
        ICECAST_LOG_INFO("Closing dumpfile for %s", source->mount);
221 222 223 224
        fclose (source->dumpfile);
        source->dumpfile = NULL;
    }

225
    /* lets kick off any clients that are left on here */
226
    avl_tree_wlock (source->client_tree);
227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
    c=0;
    while (1)
    {
        avl_node *node = avl_get_first (source->client_tree);
        if (node)
        {
            client_t *client = node->key;
            if (client->respcode == 200)
                c++; /* only count clients that have had some processing */
            avl_delete (source->client_tree, client, _free_client);
            continue;
        }
        break;
    }
    if (c)
242
    {
243
        stats_event_sub (NULL, "listeners", source->listeners);
244
        ICECAST_LOG_INFO("%d active listeners on %s released", c, source->mount);
245
    }
246
    avl_tree_unlock (source->client_tree);
247 248 249 250 251 252 253 254 255 256

    while (avl_get_first (source->pending_tree))
    {
        avl_delete (source->pending_tree,
                avl_get_first(source->pending_tree)->key, _free_client);
    }

    if (source->format && source->format->free_plugin)
        source->format->free_plugin (source->format);
    source->format = NULL;
257 258 259 260 261 262

    /* Lets clear out the source queue too */
    while (source->stream_data)
    {
        refbuf_t *p = source->stream_data;
        source->stream_data = p->next;
263
        p->next = NULL;
264 265 266 267 268 269 270
        /* can be referenced by burst handler as well */
        while (p->_count > 1)
            refbuf_release (p);
        refbuf_release (p);
    }
    source->stream_data_tail = NULL;

Karl Heyes's avatar
Karl Heyes committed
271 272 273 274
    source->burst_point = NULL;
    source->burst_size = 0;
    source->burst_offset = 0;
    source->queue_size = 0;
275
    source->queue_size_limit = 0;
276 277
    source->listeners = 0;
    source->max_listeners = -1;
278
    source->prev_listeners = 0;
279
    source->hidden = 0;
280
    source->shoutcast_compat = 0;
281
    source->client_stats_update = 0;
282
    util_dict_free(source->audio_info);
283
    source->audio_info = NULL;
284 285 286 287 288 289

    free(source->fallback_mount);
    source->fallback_mount = NULL;

    free(source->dumpfilename);
    source->dumpfilename = NULL;
Karl Heyes's avatar
Karl Heyes committed
290

291 292 293
    playlist_release(source->history);
    source->history = NULL;

Karl Heyes's avatar
Karl Heyes committed
294 295 296 297 298
    if (source->intro_file)
    {
        fclose (source->intro_file);
        source->intro_file = NULL;
    }
299 300

    source->on_demand_req = 0;
301
    avl_tree_unlock (source->pending_tree);
302 303 304
}


305
/* Remove the provided source from the global tree and free it */
306
void source_free_source (source_t *source)
Jack Moffitt's avatar
Jack Moffitt committed
307
{
308
    ICECAST_LOG_DEBUG("freeing source \"%s\"", source->mount);
309 310 311 312
    avl_tree_wlock (global.source_tree);
    avl_delete (global.source_tree, source, NULL);
    avl_tree_unlock (global.source_tree);

313 314
    avl_tree_free(source->pending_tree, _free_client);
    avl_tree_free(source->client_tree, _free_client);
315

316 317 318
    /* make sure all YP entries have gone */
    yp_remove (source->mount);

319 320
    free (source->mount);
    free (source);
Jack Moffitt's avatar
Jack Moffitt committed
321

322
    return;
Jack Moffitt's avatar
Jack Moffitt committed
323
}
324

325

326 327 328
client_t *source_find_client(source_t *source, int id)
{
    client_t fakeclient;
329
    void *result;
330 331 332 333 334 335
    connection_t fakecon;

    fakeclient.con = &fakecon;
    fakeclient.con->id = id;

    avl_tree_rlock(source->client_tree);
336
    if(avl_get_by_key(source->client_tree, &fakeclient, &result) == 0)
337 338 339 340 341 342 343 344
    {
        avl_tree_unlock(source->client_tree);
        return result;
    }

    avl_tree_unlock(source->client_tree);
    return NULL;
}
345

346

347 348 349 350 351
/* Move clients from source to dest provided dest is running
 * and that the stream format is the same.
 * The only lock that should be held when this is called is the
 * source tree lock
 */
352
void source_move_clients(source_t *source, source_t *dest)
353
{
354
    unsigned long count = 0;
355 356
    if (strcmp (source->mount, dest->mount) == 0)
    {
357
        ICECAST_LOG_WARN("src and dst are the same \"%s\", skipping", source->mount);
358 359
        return;
    }
360 361 362 363
    /* we don't want the two write locks to deadlock in here */
    thread_mutex_lock (&move_clients_mutex);

    /* if the destination is not running then we can't move clients */
364

365
    avl_tree_wlock (dest->pending_tree);
366
    if (dest->running == 0 && dest->on_demand == 0)
367
    {
368
        ICECAST_LOG_WARN("destination mount %s not running, unable to move clients ", dest->mount);
369
        avl_tree_unlock (dest->pending_tree);
370
        thread_mutex_unlock (&move_clients_mutex);
371 372 373
        return;
    }

374
    do
375
    {
376
        client_t *client;
377

378 379
        /* we need to move the client and pending trees - we must take the
         * locks in this order to avoid deadlocks */
380 381
        avl_tree_wlock(source->pending_tree);
        avl_tree_wlock(source->client_tree);
382

383
        if (source->on_demand == 0 && source->format == NULL)
384
        {
385
            ICECAST_LOG_INFO("source mount %s is not available", source->mount);
386
            break;
387
        }
388
        if (source->format && dest->format)
389
        {
390 391
            if (source->format->type != dest->format->type)
            {
392
                ICECAST_LOG_WARN("stream %s and %s are of different types, ignored", source->mount, dest->mount);
393 394
                break;
            }
395
        }
396

397 398 399 400 401 402 403
        while (1)
        {
            avl_node *node = avl_get_first (source->pending_tree);
            if (node == NULL)
                break;
            client = (client_t *)(node->key);
            avl_delete (source->pending_tree, client, NULL);
404

405
            /* when switching a client to a different queue, be wary of the
406 407 408 409 410 411 412
             * refbuf it's referring to, if it's http headers then we need
             * to write them so don't release it.
             */
            if (client->check_buffer != format_check_http_buffer)
            {
                client_set_queue (client, NULL);
                client->check_buffer = format_check_file_buffer;
413 414
                if (source->con == NULL)
                    client->intro_offset = -1;
415 416
            }

417
            avl_insert (dest->pending_tree, (void *)client);
418
            count++;
419 420 421 422 423 424 425 426 427 428 429
        }

        while (1)
        {
            avl_node *node = avl_get_first (source->client_tree);
            if (node == NULL)
                break;

            client = (client_t *)(node->key);
            avl_delete (source->client_tree, client, NULL);

430
            /* when switching a client to a different queue, be wary of the
431 432 433 434 435 436 437
             * refbuf it's referring to, if it's http headers then we need
             * to write them so don't release it.
             */
            if (client->check_buffer != format_check_http_buffer)
            {
                client_set_queue (client, NULL);
                client->check_buffer = format_check_file_buffer;
438 439
                if (source->con == NULL)
                    client->intro_offset = -1;
440
            }
441
            avl_insert (dest->pending_tree, (void *)client);
442
            count++;
443
        }
444
        ICECAST_LOG_INFO("passing %lu listeners to \"%s\"", count, dest->mount);
445

446 447 448 449 450
        source->listeners = 0;
        stats_event (source->mount, "listeners", "0");

    } while (0);

451 452 453
    avl_tree_unlock (source->pending_tree);
    avl_tree_unlock (source->client_tree);

454 455 456 457
    /* see if we need to wake up an on-demand relay */
    if (dest->running == 0 && dest->on_demand && count)
        dest->on_demand_req = 1;

458 459 460 461
    avl_tree_unlock (dest->pending_tree);
    thread_mutex_unlock (&move_clients_mutex);
}

462

Karl Heyes's avatar
Karl Heyes committed
463 464 465 466 467 468 469 470 471 472 473
/* get some data from the source. The stream data is placed in a refbuf
 * and sent back, however NULL is also valid as in the case of a short
 * timeout and there's no data pending.
 */
static refbuf_t *get_next_buffer (source_t *source)
{
    refbuf_t *refbuf = NULL;
    int delay = 250;

    if (source->short_delay)
        delay = 0;
474
    while (global.running == ICECAST_RUNNING && source->running)
Karl Heyes's avatar
Karl Heyes committed
475
    {
476
        int fds = 0;
Karl Heyes's avatar
Karl Heyes committed
477 478
        time_t current = time (NULL);

479
        if (source->client)
480 481 482 483 484 485
            fds = util_timed_wait_for_fd (source->con->sock, delay);
        else
        {
            thread_sleep (delay*1000);
            source->last_read = current;
        }
Karl Heyes's avatar
Karl Heyes committed
486

487 488 489
        if (current >= source->client_stats_update)
        {
            stats_event_args (source->mount, "total_bytes_read",
490
                    "%"PRIu64, source->format->read_bytes);
491
            stats_event_args (source->mount, "total_bytes_sent",
492
                    "%"PRIu64, source->format->sent_bytes);
493 494
            source->client_stats_update = current + 5;
        }
Karl Heyes's avatar
Karl Heyes committed
495 496 497 498
        if (fds < 0)
        {
            if (! sock_recoverable (sock_error()))
            {
499
                ICECAST_LOG_WARN("Error while waiting on socket, Disconnecting source");
Karl Heyes's avatar
Karl Heyes committed
500 501 502 503 504 505
                source->running = 0;
            }
            break;
        }
        if (fds == 0)
        {
506 507
            thread_mutex_lock(&source->lock);
            if ((source->last_read + (time_t)source->timeout) < current)
Karl Heyes's avatar
Karl Heyes committed
508
            {
509
                ICECAST_LOG_DEBUG("last %ld, timeout %d, now %ld", (long)source->last_read,
510
                        source->timeout, (long)current);
511
                ICECAST_LOG_WARN("Disconnecting source due to socket timeout");
Karl Heyes's avatar
Karl Heyes committed
512 513
                source->running = 0;
            }
514
            thread_mutex_unlock(&source->lock);
Karl Heyes's avatar
Karl Heyes committed
515 516 517 518
            break;
        }
        source->last_read = current;
        refbuf = source->format->get_buffer (source);
519
        if (source->client->con && source->client->con->tls && tls_got_shutdown(source->client->con->tls) > 1)
520
            source->client->con->error = 1;
521
        if (source->client->con && source->client->con->error)
522
        {
523
            ICECAST_LOG_INFO("End of Stream %s", source->mount);
524 525 526
            source->running = 0;
            continue;
        }
Karl Heyes's avatar
Karl Heyes committed
527 528 529 530 531 532 533 534 535 536 537
        if (refbuf)
            break;
    }

    return refbuf;
}


/* general send routine per listener.  The deletion_expected tells us whether
 * the last in the queue is about to disappear, so if this client is still
 * referring to it after writing then drop the client as it's fallen too far
538 539
 * behind
 */
Karl Heyes's avatar
Karl Heyes committed
540 541 542 543 544 545 546 547
static void send_to_listener (source_t *source, client_t *client, int deletion_expected)
{
    int bytes;
    int loop = 10;   /* max number of iterations in one go */
    int total_written = 0;

    while (1)
    {
548 549 550 551
        /* check for limited listener time */
        if (client->con->discon_time)
            if (time(NULL) >= client->con->discon_time)
            {
552
                ICECAST_LOG_INFO("time limit reached for client #%lu", client->con->id);
553 554 555
                client->con->error = 1;
            }

Karl Heyes's avatar
Karl Heyes committed
556 557 558 559 560 561 562 563
        /* jump out if client connection has died */
        if (client->con->error)
            break;

        /* lets not send too much to one client in one go, but don't
           sleep for too long if more data can be sent */
        if (total_written > 20000 || loop == 0)
        {
564 565
            if (client->check_buffer != format_check_file_buffer)
                source->short_delay = 1;
Karl Heyes's avatar
Karl Heyes committed
566 567 568 569 570
            break;
        }

        loop--;

571
        if (client->check_buffer(source, client) < 0)
Karl Heyes's avatar
Karl Heyes committed
572 573
            break;

574
        bytes = client->write_to_client(client);
Karl Heyes's avatar
Karl Heyes committed
575
        if (bytes <= 0)
576
            break; /* can't write any more */
Karl Heyes's avatar
Karl Heyes committed
577 578 579

        total_written += bytes;
    }
580
    source->format->sent_bytes += total_written;
Karl Heyes's avatar
Karl Heyes committed
581 582 583

    /* the refbuf referenced at head (last in queue) may be marked for deletion
     * if so, check to see if this client is still referring to it */
Karl Heyes's avatar
Karl Heyes committed
584
    if (deletion_expected && client->refbuf && client->refbuf == source->stream_data)
Karl Heyes's avatar
Karl Heyes committed
585
    {
586
        ICECAST_LOG_INFO("Client %lu (%s) has fallen too far behind, removing",
587 588
                client->con->id, client->con->ip);
        stats_event_inc (source->mount, "slow_listeners");
Karl Heyes's avatar
Karl Heyes committed
589 590 591 592
        client->con->error = 1;
    }
}

Jack Moffitt's avatar
Jack Moffitt committed
593

594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
/* Open the file for stream dumping.
 * This function should do all processing of the filename.
 */
static FILE * source_open_dumpfile(const char * filename) {
#ifndef _WIN32
    /* some of the below functions seems not to be standard winapi functions */
    char buffer[PATH_MAX];
    time_t curtime;
    struct tm *loctime;

    /* Get the current time. */
    curtime = time (NULL);

    /* Convert it to local time representation. */
    loctime = localtime (&curtime);

    strftime (buffer, sizeof(buffer), filename, loctime);
    filename = buffer;
#endif

    return fopen (filename, "ab");
}

Karl Heyes's avatar
Karl Heyes committed
617 618 619
/* Perform any initialisation just before the stream data is processed, the header
 * info is processed by now and the format details are setup
 */
620
static void source_init (source_t *source)
Jack Moffitt's avatar
Jack Moffitt committed
621
{
622
    ice_config_t *config = config_get_config();
623 624
    char *listenurl;
    const char *str;
625 626
    int listen_url_size;

627
    /* 6 for max size of port */
628
    listen_url_size = strlen("http://") + strlen(config->hostname) +
629
        strlen(":") + 6 + strlen(source->mount) + 1;
630 631

    listenurl = malloc (listen_url_size);
632 633
    snprintf (listenurl, listen_url_size, "http://%s:%d%s",
            config->hostname, config->port, source->mount);
634 635
    config_release_config();

636 637 638 639 640 641 642 643
    str = httpp_getvar(source->parser, "ice-audio-info");
    source->audio_info = util_dict_new();
    if (str)
    {
        _parse_audio_info (source, str);
        stats_event (source->mount, "audio_info", str);
    }

644 645
    stats_event (source->mount, "listenurl", listenurl);

Michael Smith's avatar
Michael Smith committed
646
    free(listenurl);
647

648 649
    if (source->dumpfilename != NULL)
    {
650
        source->dumpfile = source_open_dumpfile (source->dumpfilename);
651 652
        if (source->dumpfile == NULL)
        {
653
            ICECAST_LOG_WARN("Cannot open dump file \"%s\" for appending: %s, disabling.",
654 655 656 657
                    source->dumpfilename, strerror(errno));
        }
    }

658 659 660 661 662 663
    /* grab a read lock, to make sure we get a chance to cleanup */
    thread_rwlock_rlock (source->shutdown_rwlock);

    /* start off the statistics */
    source->listeners = 0;
    stats_event_inc (NULL, "source_total_connections");
664
    stats_event (source->mount, "slow_listeners", "0");
665
    stats_event_args (source->mount, "listeners", "%lu", source->listeners);
666
    stats_event_args (source->mount, "listener_peak", "%lu", source->peak_listeners);
Karl Heyes's avatar
Karl Heyes committed
667
    stats_event_time (source->mount, "stream_start");
668
    stats_event_time_iso8601 (source->mount, "stream_start_iso8601");
669

670
    ICECAST_LOG_DEBUG("Source creation complete");
Karl Heyes's avatar
Karl Heyes committed
671
    source->last_read = time (NULL);
672
    source->prev_listeners = -1;
673
    source->running = 1;
674

675
    event_emit_clientevent("source-connect", source->client, source->mount);
676

Michael Smith's avatar
Michael Smith committed
677 678
    /*
    ** Now, if we have a fallback source and override is on, we want
679
    ** to steal its clients, because it means we've come back online
Michael Smith's avatar
Michael Smith committed
680 681 682 683
    ** after a failure and they should be gotten back from the waiting
    ** loop or jingle track or whatever the fallback is used for
    */

684 685 686 687
    if (source->fallback_override && source->fallback_mount)
    {
        source_t *fallback_source;

Michael Smith's avatar
Michael Smith committed
688 689 690
        avl_tree_rlock(global.source_tree);
        fallback_source = source_find_mount(source->fallback_mount);

691 692
        if (fallback_source)
            source_move_clients (fallback_source, source);
Michael Smith's avatar
Michael Smith committed
693

694
        avl_tree_unlock(global.source_tree);
Michael Smith's avatar
Michael Smith committed
695
    }
696 697 698 699 700
}


void source_main (source_t *source)
{
Karl Heyes's avatar
Karl Heyes committed
701
    refbuf_t *refbuf;
702 703 704 705
    client_t *client;
    avl_node *client_node;

    source_init (source);
Michael Smith's avatar
Michael Smith committed
706

707
    while (global.running == ICECAST_RUNNING && source->running) {
Karl Heyes's avatar
Karl Heyes committed
708
        int remove_from_q;
Jack Moffitt's avatar
Jack Moffitt committed
709

Karl Heyes's avatar
Karl Heyes committed
710
        refbuf = get_next_buffer (source);
711

Karl Heyes's avatar
Karl Heyes committed
712 713
        remove_from_q = 0;
        source->short_delay = 0;
714

Karl Heyes's avatar
Karl Heyes committed
715 716 717 718
        if (refbuf)
        {
            /* append buffer to the in-flight data queue,  */
            if (source->stream_data == NULL)
Michael Smith's avatar
Michael Smith committed
719
            {
Karl Heyes's avatar
Karl Heyes committed
720 721
                source->stream_data = refbuf;
                source->burst_point = refbuf;
722
            }
Karl Heyes's avatar
Karl Heyes committed
723 724 725 726 727
            if (source->stream_data_tail)
                source->stream_data_tail->next = refbuf;
            source->stream_data_tail = refbuf;
            source->queue_size += refbuf->len;
            /* new buffer is referenced for burst */
728
            refbuf_addref(refbuf);
Karl Heyes's avatar
Karl Heyes committed
729 730 731

            /* new data on queue, so check the burst point */
            source->burst_offset += refbuf->len;
732
            while (source->burst_offset > source->burst_size)
Karl Heyes's avatar
Karl Heyes committed
733
            {
734 735 736
                refbuf_t *to_release = source->burst_point;

                if (to_release->next)
Karl Heyes's avatar
Karl Heyes committed
737
                {
738 739
                    source->burst_point = to_release->next;
                    source->burst_offset -= to_release->len;
740
                    refbuf_release(to_release);
741
                    continue;
742
                }
743
                break;
744 745
            }

Karl Heyes's avatar
Karl Heyes committed
746 747
            /* save stream to file */
            if (source->dumpfile && source->format->write_buf_to_file)
748
                source->format->write_buf_to_file(source, refbuf);
749
        }
Karl Heyes's avatar
Karl Heyes committed
750
        /* lets see if we have too much data in the queue, but don't remove it until later */
751
        thread_mutex_lock(&source->lock);
Karl Heyes's avatar
Karl Heyes committed
752 753
        if (source->queue_size > source->queue_size_limit)
            remove_from_q = 1;
754
        thread_mutex_unlock(&source->lock);
755

756 757 758
        /* acquire write lock on pending_tree */
        avl_tree_wlock(source->pending_tree);

759 760 761 762 763
        /* acquire write lock on client_tree */
        avl_tree_wlock(source->client_tree);

        client_node = avl_get_first(source->client_tree);
        while (client_node) {
764
            client = (client_t *) client_node->key;
Karl Heyes's avatar
Karl Heyes committed
765

766
            send_to_listener(source, client, remove_from_q);
Karl Heyes's avatar
Karl Heyes committed
767

768 769
            if (client->con->error) {
                client_node = avl_get_next(client_node);
770
                if (client->respcode == 200)
771 772
                    stats_event_dec(NULL, "listeners");
                avl_delete(source->client_tree, (void *) client, _free_client);
Michael Smith's avatar
Michael Smith committed
773
                source->listeners--;
774
                ICECAST_LOG_DEBUG("Client removed");
775 776 777 778 779 780 781 782
                continue;
            }
            client_node = avl_get_next(client_node);
        }

        /** add pending clients **/
        client_node = avl_get_first(source->pending_tree);
        while (client_node) {
783

784 785
            if(source->max_listeners != -1 &&
                    source->listeners >= (unsigned long)source->max_listeners)
Michael Smith's avatar
Michael Smith committed
786 787 788 789 790 791 792 793 794 795
            {
                /* The common case is caught in the main connection handler,
                 * this deals with rarer cases (mostly concerning fallbacks)
                 * and doesn't give the listening client any information about
                 * why they were disconnected
                 */
                client = (client_t *)client_node->key;
                client_node = avl_get_next(client_node);
                avl_delete(source->pending_tree, (void *)client, _free_client);

796
                ICECAST_LOG_INFO("Client deleted, exceeding maximum listeners for this "
ePirat's avatar
ePirat committed
797
                        "mountpoint (%s).", source->mount);
Michael Smith's avatar
Michael Smith committed
798 799
                continue;
            }
800

Michael Smith's avatar
Michael Smith committed
801
            /* Otherwise, the client is accepted, add it */
802
            avl_insert(source->client_tree, client_node->key);
Michael Smith's avatar
Michael Smith committed
803 804

            source->listeners++;
805
            ICECAST_LOG_DEBUG("Client added for mountpoint (%s)", source->mount);
806 807 808 809 810 811 812
            stats_event_inc(source->mount, "connections");

            client_node = avl_get_next(client_node);
        }

        /** clear pending tree **/
        while (avl_get_first(source->pending_tree)) {
813 814
            avl_delete(source->pending_tree,
                    avl_get_first(source->pending_tree)->key,
Michael Smith's avatar
Michael Smith committed
815
                    source_remove_client);
816 817 818 819 820
        }

        /* release write lock on pending_tree */
        avl_tree_unlock(source->pending_tree);

Karl Heyes's avatar
Karl Heyes committed
821
        /* update the stats if need be */
822
        if (source->listeners != source->prev_listeners)
Karl Heyes's avatar
Karl Heyes committed
823
        {
824
            source->prev_listeners = source->listeners;
825
            ICECAST_LOG_INFO("listener count on %s now %lu", source->mount, source->listeners);
Karl Heyes's avatar
Karl Heyes committed
826 827 828 829 830
            if (source->listeners > source->peak_listeners)
            {
                source->peak_listeners = source->listeners;
                stats_event_args (source->mount, "listener_peak", "%lu", source->peak_listeners);
            }
831
            stats_event_args (source->mount, "listeners", "%lu", source->listeners);
832 833
            if (source->listeners == 0 && source->on_demand)
                source->running = 0;
Karl Heyes's avatar
Karl Heyes committed
834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
        }

        /* lets reduce the queue, any lagging clients should of been
         * terminated by now
         */
        if (source->stream_data)
        {
            /* normal unreferenced queue data will have a refcount 1, but
             * burst queue data will be at least 2, active clients will also
             * increase refcount */
            while (source->stream_data->_count == 1)
            {
                refbuf_t *to_go = source->stream_data;

                if (to_go->next == NULL || source->burst_point == to_go)
                {
                    /* this should not happen */
851
                    ICECAST_LOG_ERROR("queue state is unexpected");
Karl Heyes's avatar
Karl Heyes committed
852 853 854 855 856
                    source->running = 0;
                    break;
                }
                source->stream_data = to_go->next;
                source->queue_size -= to_go->len;
857
                to_go->next = NULL;
Karl Heyes's avatar
Karl Heyes committed
858 859 860 861
                refbuf_release (to_go);
            }
        }

862 863 864
        /* release write lock on client_tree */
        avl_tree_unlock(source->client_tree);
    }
Karl Heyes's avatar
Karl Heyes committed
865 866
    source_shutdown (source);
}
Jack Moffitt's avatar
Jack Moffitt committed
867

Michael Smith's avatar
Michael Smith committed
868

Karl Heyes's avatar
Karl Heyes committed
869 870
static void source_shutdown (source_t *source)
{
871
    source->running = 0;
872 873 874 875 876
    if (source->con && source->con->ip) {
        ICECAST_LOG_INFO("Source from %s at \"%s\" exiting", source->con->ip, source->mount);
    } else {
        ICECAST_LOG_INFO("Source at \"%s\" exiting", source->mount);
    }
877

878
    event_emit_clientevent("source-disconnect", source->client, source->mount);
879

880 881
    /* we have de-activated the source now, so no more clients will be
     * added, now move the listeners we have to the fallback (if any)
882
     */
883 884 885
    if (source->fallback_mount)
    {
        source_t *fallback_source;
Michael Smith's avatar
Michael Smith committed
886

887
        avl_tree_rlock(global.source_tree);
888
        fallback_source = source_find_mount(source->fallback_mount);
Michael Smith's avatar
Michael Smith committed
889

890
        if (fallback_source != NULL)
891
            source_move_clients(source, fallback_source);
892

893
        avl_tree_unlock(global.source_tree);
894
    }
Jack Moffitt's avatar
Jack Moffitt committed
895

896
    /* delete this sources stats */
897
    stats_event(source->mount, NULL, NULL);
Jack Moffitt's avatar
Jack Moffitt committed
898

899 900 901 902 903 904 905 906
    if (source->client && source->parser) {
        /* For PUT support we check for 100-continue and send back a final 200. */
        const char *expectcontinue = httpp_getvar(source->parser, "expect");

        if (expectcontinue != NULL) {
#ifdef HAVE_STRCASESTR
            if (strcasestr (expectcontinue, "100-continue") != NULL)
#else
907
            ICECAST_LOG_WARN("OS doesn't support case insensitive substring checks...");
908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
            if (strstr (expectcontinue, "100-continue") != NULL)
#endif
            {
                client_t *client = source->client;
                source->client = NULL; /* detach client from source. */

                util_http_build_header(client->refbuf->data, PER_CLIENT_REFBUF_SIZE, 0, 0, 200, NULL, NULL, NULL, "", NULL, source->client);
                client->refbuf->len = strlen(client->refbuf->data);
                refbuf_release(client->refbuf->next);
                client->refbuf->next = NULL;
                client->pos = 0;
                fserve_add_client(client, NULL);
            }
        }
    }

924
    /* we don't remove the source from the tree here, it may be a relay and
925 926
     therefore reserved */
    source_clear_source(source);
927

928 929
    global_lock();
    global.sources--;
930
    stats_event_args(NULL, "sources", "%d", global.sources);
931
    global_unlock();
Jack Moffitt's avatar
Jack Moffitt committed
932