slave.c 14.5 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12
/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 */

13
/* -*- c-basic-offset: 4; indent-tabs-mode: nil; -*- */
14 15 16 17 18 19 20
/* slave.c
 * by Ciaran Anscomb <ciaran.anscomb@6809.org.uk>
 *
 * Periodically requests a list of streams from a master server
 * and creates source threads for any it doesn't already have.
 * */

21 22 23 24
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>

#ifndef _WIN32
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#else
#include <winsock2.h>
#define snprintf _snprintf
#define strcasecmp stricmp
#define strncasecmp strnicmp
#endif

#include "os.h"

Karl Heyes's avatar
Karl Heyes committed
44 45 46 47
#include "thread/thread.h"
#include "avl/avl.h"
#include "net/sock.h"
#include "httpp/httpp.h"
48

49
#include "cfgfile.h"
50 51 52 53 54 55 56 57
#include "global.h"
#include "util.h"
#include "connection.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"
#include "logging.h"
#include "source.h"
Michael Smith's avatar
Michael Smith committed
58
#include "format.h"
59 60 61 62

#define CATMODULE "slave"

static void *_slave_thread(void *arg);
63
static thread_type *_slave_thread_id;
64
static int slave_running = 0;
65 66
volatile static unsigned int max_interval = 0;
volatile static int rescan_relays = 0;
67

68
relay_server *relay_free (relay_server *relay)
69
{
70 71 72 73 74 75 76
    relay_server *next = relay->next;
    DEBUG1("freeing relay %s", relay->localmount);
    if (relay->source)
       source_free_source (relay->source);
    xmlFree (relay->server);
    xmlFree (relay->mount);
    xmlFree (relay->localmount);
77 78 79 80
    if (relay->username)
        xmlFree (relay->username);
    if (relay->password)
        xmlFree (relay->password);
81
    free (relay);
82
    return next;
83 84
}

85

86 87 88
relay_server *relay_copy (relay_server *r)
{
    relay_server *copy = calloc (1, sizeof (relay_server));
Michael Smith's avatar
Michael Smith committed
89

90
    if (copy)
Michael Smith's avatar
Michael Smith committed
91
    {
92 93 94
        copy->server = xmlStrdup (r->server);
        copy->mount = xmlStrdup (r->mount);
        copy->localmount = xmlStrdup (r->localmount);
95 96 97 98
        if (r->username)
            copy->username = xmlStrdup (r->username);
        if (r->password)
            copy->password = xmlStrdup (r->password);
99 100
        copy->port = r->port;
        copy->mp3metadata = r->mp3metadata;
Michael Smith's avatar
Michael Smith committed
101
    }
102 103
    return copy;
}
104

105

106 107 108 109
/* force a recheck of the relays. This will recheck the master server if
 * a this is a slave.
 */
void slave_recheck (void)
110
{
111
    max_interval = 0;
112 113
}

114 115 116 117
/* rescan the current relays to see if any need starting or if any
 * relay threads have terminated
 */
void slave_rescan (void)
118
{
119
    rescan_relays = 1;
120 121
}

122 123

void slave_initialize(void)
Michael Smith's avatar
Michael Smith committed
124
{
125 126
    if (slave_running)
        return;
Michael Smith's avatar
Michael Smith committed
127

128
    slave_running = 1;
129
    max_interval = 0;
130 131
    _slave_thread_id = thread_create("Slave Thread", _slave_thread, NULL, THREAD_ATTACHED);
}
132

Michael Smith's avatar
Michael Smith committed
133

134 135 136
void slave_shutdown(void)
{
    if (!slave_running)
137
        return;
138
    slave_running = 0;
139
    DEBUG0 ("waiting for slave thread");
140 141 142 143 144 145 146
    thread_join (_slave_thread_id);
}


/* This does the actual connection for a relay. A thread is
 * started off if a connection can be acquired
 */
147
static void *start_relay_stream (void *arg)
148
{
149
    relay_server *relay = arg;
150 151 152 153 154 155
    sock_t streamsock = SOCK_ERROR;
    source_t *src = relay->source;
    http_parser_t *parser = NULL;
    connection_t *con=NULL;
    char header[4096];

156
    relay->running = 1;
157 158 159
    INFO1("Starting relayed source at mountpoint \"%s\"", relay->localmount);
    do
    {
160 161
        char *auth_header;

162 163 164 165 166 167
        streamsock = sock_connect_wto (relay->server, relay->port, 30);
        if (streamsock == SOCK_ERROR)
        {
            WARN3("Failed to relay stream from master server, couldn't connect to http://%s:%d%s",
                    relay->server, relay->port, relay->mount);
            break;
Michael Smith's avatar
Michael Smith committed
168
        }
169 170
        con = create_connection (streamsock, -1, NULL);

171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
        if (relay->username && relay->password)
        {
            char *esc_authorisation;
            unsigned len = strlen(relay->username) + strlen(relay->password) + 2;

            auth_header = malloc (len);
            snprintf (auth_header, len, "%s:%s", relay->username, relay->password);
            esc_authorisation = util_base64_encode(auth_header);
            free(auth_header);
            len = strlen (esc_authorisation) + 24;
            auth_header = malloc (len);
            snprintf (auth_header, len,
                    "Authorization: Basic %s\r\n", esc_authorisation);
            free(esc_authorisation);
        }
        else
        {
            auth_header = strdup ("");
        }

191 192 193 194 195 196 197 198
        /* At this point we may not know if we are relaying an mp3 or vorbis
         * stream, but only send the icy-metadata header if the relay details
         * state so (the typical case).  It's harmless in the vorbis case. If
         * we don't send in this header then relay will not have mp3 metadata.
         */
        sock_write(streamsock, "GET %s HTTP/1.0\r\n"
                "User-Agent: " ICECAST_VERSION_STRING "\r\n"
                "%s"
199
                "%s"
200
                "\r\n",
201 202 203 204
                relay->mount,
                relay->mp3metadata?"Icy-MetaData: 1\r\n":"",
                auth_header);
        free (auth_header);
205
        memset (header, 0, sizeof(header));
206
        if (util_read_header (con->sock, header, 4096, READ_ENTIRE_HEADER) == 0)
207 208 209 210 211 212 213 214
        {
            WARN0("Header read failed");
            break;
        }
        parser = httpp_create_parser();
        httpp_initialize (parser, NULL);
        if (! httpp_parse_response (parser, header, strlen(header), relay->localmount))
        {
Michael Smith's avatar
Michael Smith committed
215
            ERROR0("Error parsing relay request");
216 217 218 219 220 221 222 223 224 225 226 227 228 229
            break;
        }
        if (httpp_getvar (parser, HTTPP_VAR_ERROR_MESSAGE))
        {
            ERROR1("Error from relay request: %s", httpp_getvar(parser, HTTPP_VAR_ERROR_MESSAGE));
            break;
        }
        src->parser = parser;
        src->con = con;
        if (connection_complete_source (src) < 0)
        {
            DEBUG0("Failed to complete source initialisation");
            break;
        }
230
        stats_event_inc(NULL, "source_relay_connections");
231

232 233 234 235 236 237 238
        source_main (relay->source);

        /* initiate an immediate relay cleanup run */
        relay->cleanup = 1;
        slave_rescan();

        return NULL;
239 240 241 242 243 244 245 246 247 248
    } while (0);

    if (con == NULL && streamsock != SOCK_ERROR)
        sock_close (streamsock);
    if (con)
        connection_close (con);
    src->con = NULL;
    if (parser)
        httpp_destroy (parser);
    src->parser = NULL;
249
    source_clear_source (relay->source);
250 251 252 253 254 255

    /* initiate an immediate relay cleanup run */
    relay->cleanup = 1;
    slave_rescan();

    return NULL;
256 257 258 259 260 261 262 263
}


/* wrapper for starting the provided relay stream */
static void check_relay_stream (relay_server *relay)
{
    if (relay->source == NULL)
    {
264 265 266 267 268 269
        if (relay->localmount[0] != '/')
        {
            WARN1 ("relay mountpoint \"%s\" does not start with /, skipping",
                    relay->localmount);
            return;
        }
270 271
        /* new relay, reserve the name */
        relay->source = source_reserve (relay->localmount);
272 273 274 275
        if (relay->source)
            DEBUG1("Adding relay source at mountpoint \"%s\"", relay->localmount);
        else
            WARN1 ("new relay but source \"%s\" already exists", relay->localmount);
276 277 278
    }
    if (relay->source && !relay->running)
    {
279 280 281 282 283 284 285 286 287 288 289 290
        relay->thread = thread_create ("Relay Thread", start_relay_stream,
                relay, THREAD_ATTACHED);
        return;
    }
    /* the relay thread may of close down */
    if (relay->cleanup && relay->thread)
    {
        DEBUG1 ("waiting for relay thread for \"%s\"", relay->localmount);
        thread_join (relay->thread);
        relay->thread = NULL;
        relay->cleanup = 0;
        relay->running = 0;
Michael Smith's avatar
Michael Smith committed
291
    }
292 293
}

Michael Smith's avatar
Michael Smith committed
294

295 296 297 298 299 300 301 302 303 304 305 306 307
/* go through updated looking for relays that are different configured. The
 * returned list contains relays that should be kept running, current contains
 * the list of relays to shutdown
 */
static relay_server *
update_relay_set (relay_server **current, relay_server *updated)
{
    relay_server *relay = updated;
    relay_server *existing_relay, **existing_p;
    relay_server *new_list = NULL;

    while (relay)
    {
308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330
        existing_relay = *current;
        existing_p = current;

        while (existing_relay)
        {
            /* break out if keeping relay */
            if (strcmp (relay->localmount, existing_relay->localmount) == 0)
                break;
            existing_p = &existing_relay->next;
            existing_relay = existing_relay->next;
        }
        if (existing_relay == NULL)
        {
            /* new one, copy and insert */
            existing_relay = relay_copy (relay);
        }
        else
        {
            *existing_p = existing_relay->next;
        }
        existing_relay->next = new_list;
        new_list = existing_relay;
        relay = relay->next;
331
    }
332 333 334 335 336 337
    return new_list;
}


/* update the relay_list with entries from new_relay_list. Any new relays
 * are added to the list, and any not listed in the provided new_relay_list
338
 * are separated and returned in a separate list
339
 */
340
static relay_server *
341 342
update_relays (relay_server **relay_list, relay_server *new_relay_list)
{
343
    relay_server *active_relays, *cleanup_relays;
344

345
    active_relays = update_relay_set (relay_list, new_relay_list);
346

347 348 349 350 351 352 353 354 355 356 357 358 359
    cleanup_relays = *relay_list;
    /* re-assign new set */
    *relay_list = active_relays;

    return cleanup_relays;
}


static void relay_check_streams (relay_server *to_start, relay_server *to_free)
{
    relay_server *relay;

    while (to_free)
360
    {
361
        if (to_free->running && to_free->source)
362
        {
363 364 365
            DEBUG1 ("source shutdown request on \"%s\"", to_free->localmount);
            to_free->source->running = 0;
            thread_join (to_free->thread);
366
        }
367 368 369 370 371 372 373 374
        to_free = relay_free (to_free);
    }

    relay = to_start;
    while (relay)
    {
        check_relay_stream (relay);
        relay = relay->next;
375
    }
Michael Smith's avatar
Michael Smith committed
376 377
}

378 379 380 381 382

static int update_from_master(ice_config_t *config)
{
    char *master = NULL, *password = NULL, *username= NULL;
    int port;
383
    sock_t mastersock;
384
    int ret = 0;
385
    char buf[256];
386 387 388
    do
    {
        char *authheader, *data;
389
        relay_server *new_relays = NULL, *cleanup_relays;
390
        int len, count = 1;
391

392 393 394
        username = strdup ("relay");
        if (config->master_password)
            password = strdup (config->master_password);
Michael Smith's avatar
Michael Smith committed
395

396 397
        if (config->master_server)
            master = strdup (config->master_server);
Michael Smith's avatar
Michael Smith committed
398

399
        port = config->master_server_port;
Michael Smith's avatar
Michael Smith committed
400

401 402 403 404 405
        if (password == NULL || master == NULL || port == 0)
            break;
        ret = 1;
        config_release_config();
        mastersock = sock_connect_wto (master, port, 0);
406

407 408 409 410 411
        if (mastersock == SOCK_ERROR)
        {
            WARN0("Relay slave failed to contact master server to fetch stream list");
            break;
        }
Michael Smith's avatar
Michael Smith committed
412

413 414 415
        len = strlen(username) + strlen(password) + 2;
        authheader = malloc(len);
        snprintf (authheader, len, "%s:%s", username, password);
416 417 418 419 420 421 422 423
        data = util_base64_encode(authheader);
        sock_write (mastersock,
                "GET /admin/streamlist.txt HTTP/1.0\r\n"
                "Authorization: Basic %s\r\n"
                "\r\n", data);
        free(authheader);
        free(data);

424 425 426 427 428 429 430 431
        if (sock_read_line(mastersock, buf, sizeof(buf)) == 0 ||
                strncmp (buf, "HTTP/1.0 200", 12) != 0)
        {
            sock_close (mastersock);
            WARN0 ("Master rejected streamlist request");
            break;
        }

432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450
        while (sock_read_line(mastersock, buf, sizeof(buf)))
        {
            if (!strlen(buf))
                break;
        }
        while (sock_read_line(mastersock, buf, sizeof(buf)))
        {
            relay_server *r;
            if (!strlen(buf))
                continue;
            DEBUG2 ("read %d from master \"%s\"", count++, buf);
            r = calloc (1, sizeof (relay_server));
            if (r)
            {
                r->server = xmlStrdup (master);
                r->port = port;
                r->mount = xmlStrdup (buf);
                r->localmount = xmlStrdup (buf);
                r->mp3metadata = 1;
451 452
                r->next = new_relays;
                new_relays = r;
453
            }
Michael Smith's avatar
Michael Smith committed
454
        }
455 456
        sock_close (mastersock);

457 458 459 460 461 462 463 464
        thread_mutex_lock (&(config_locks()->relay_lock));
        cleanup_relays = update_relays (&global.master_relays, new_relays);
        
        relay_check_streams (global.master_relays, cleanup_relays);
        relay_check_streams (NULL, new_relays);

        thread_mutex_unlock (&(config_locks()->relay_lock));

465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480
    } while(0);

    if (master)
        free (master);
    if (username)
        free (username);
    if (password)
        free (password);

    return ret;
}


static void *_slave_thread(void *arg)
{
    ice_config_t *config;
481
    unsigned int interval = 0;
Michael Smith's avatar
Michael Smith committed
482

483
    while (1)
484
    {
485 486
        relay_server *cleanup_relays;

487
        thread_sleep (1000000);
488 489
        if (slave_running == 0)
            break;
490
        if (rescan_relays == 0 && max_interval > ++interval)
491 492
            continue;

493 494 495 496 497
        /* only update relays lists when required */
        if (max_interval <= interval)
        {
            DEBUG0 ("checking master stream list");
            config = config_get_config();
Michael Smith's avatar
Michael Smith committed
498

499 500
            interval = 0;
            max_interval = config->master_update_interval;
Michael Smith's avatar
Michael Smith committed
501

502 503 504
            /* the connection could take some time, so the lock can drop */
            if (update_from_master (config))
                config = config_get_config();
505

506
            thread_mutex_lock (&(config_locks()->relay_lock));
507

508
            cleanup_relays = update_relays (&global.relays, config->relay);
509

510
            config_release_config();
511

512 513 514 515
            relay_check_streams (global.relays, cleanup_relays);
            thread_mutex_unlock (&(config_locks()->relay_lock));
        }
        else
516
        {
517 518 519 520 521
            DEBUG0 ("rescanning relay lists");
            thread_mutex_lock (&(config_locks()->relay_lock));
            relay_check_streams (global.master_relays, NULL);
            relay_check_streams (global.relays, NULL);
            thread_mutex_unlock (&(config_locks()->relay_lock));
Michael Smith's avatar
Michael Smith committed
522
        }
523
        rescan_relays = 0;
524
    }
525 526 527 528
    DEBUG0 ("shutting down current relays");
    relay_check_streams (NULL, global.relays);
    relay_check_streams (NULL, global.master_relays);

529 530
    INFO0 ("Slave thread shutdown complete");

531
    return NULL;
532
}
Michael Smith's avatar
Michael Smith committed
533