connection.c 18.5 KB
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifndef _WIN32
#include <sys/time.h>
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#include <sys/socket.h>
#include <netinet/in.h>
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#else
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#include <winsock2.h>
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#define snprintf _snprintf
#define strcasecmp stricmp
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#define strncasecmp strnicmp
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#endif
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#include "os.h"

#include "thread.h"
#include "avl.h"
#include "sock.h"
#include "log.h"
#include "httpp.h"

#include "config.h"
#include "global.h"
#include "util.h"
#include "connection.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"
#include "format.h"
#include "logging.h"
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#include "xslt.h"
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#include "source.h"

#define CATMODULE "connection"

typedef struct con_queue_tag {
	connection_t *con;
	struct con_queue_tag *next;
} con_queue_t;

typedef struct _thread_queue_tag {
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	thread_t *thread_id;
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	struct _thread_queue_tag *next;
} thread_queue_t;

static mutex_t _connection_mutex;
static unsigned long _current_id = 0;
static int _initialized = 0;
static cond_t _pool_cond;

static con_queue_t *_queue = NULL;
static mutex_t _queue_mutex;

static thread_queue_t *_conhands = NULL;

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rwlock_t _source_shutdown_rwlock;
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static void *_handle_connection(void *arg);

void connection_initialize(void)
{
	if (_initialized) return;
	
	thread_mutex_create(&_connection_mutex);
	thread_mutex_create(&_queue_mutex);
	thread_rwlock_create(&_source_shutdown_rwlock);
	thread_cond_create(&_pool_cond);
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    thread_cond_create(&global.shutdown_cond);
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	_initialized = 1;
}

void connection_shutdown(void)
{
	if (!_initialized) return;
	
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    thread_cond_destroy(&global.shutdown_cond);
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	thread_cond_destroy(&_pool_cond);
	thread_rwlock_destroy(&_source_shutdown_rwlock);
	thread_mutex_destroy(&_queue_mutex);
	thread_mutex_destroy(&_connection_mutex);

	_initialized = 0;
}

static unsigned long _next_connection_id(void)
{
	unsigned long id;

	thread_mutex_lock(&_connection_mutex);
	id = _current_id++;
	thread_mutex_unlock(&_connection_mutex);

	return id;
}

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connection_t *create_connection(sock_t sock, char *ip) {
	connection_t *con;
	con = (connection_t *)malloc(sizeof(connection_t));
	memset(con, 0, sizeof(connection_t));
	con->sock = sock;
	con->con_time = time(NULL);
	con->id = _next_connection_id();
	con->ip = ip;
	return con;
}

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static connection_t *_accept_connection(void)
{
	int sock;
	connection_t *con;
	char *ip;

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    if (util_timed_wait_for_fd(global.serversock, 30) <= 0) {
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		return NULL;
	}

	/* malloc enough room for 123.123.123.123\0 */
	ip = (char *)malloc(16);

	sock = sock_accept(global.serversock, ip, 16);
	if (sock >= 0) {
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		con = create_connection(sock, ip);
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		return con;
	}

	if (!sock_recoverable(sock_error()))
		WARN2("accept() failed with error %d: %s", sock_error(), strerror(sock_error()));
	
	free(ip);

	return NULL;
}

static void _add_connection(connection_t *con)
{
	con_queue_t *node;

	node = (con_queue_t *)malloc(sizeof(con_queue_t));
	
	thread_mutex_lock(&_queue_mutex);
	node->con = con;
	node->next = _queue;
	_queue = node;
	thread_mutex_unlock(&_queue_mutex);

}

static void _signal_pool(void)
{
	thread_cond_signal(&_pool_cond);
}

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static void _push_thread(thread_queue_t **queue, thread_t *thread_id)
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{
	/* create item */
	thread_queue_t *item = (thread_queue_t *)malloc(sizeof(thread_queue_t));
	item->thread_id = thread_id;
	item->next = NULL;


	thread_mutex_lock(&_queue_mutex);
	if (*queue == NULL) {
		*queue = item;
	} else {
		item->next = *queue;
		*queue = item;
	}
	thread_mutex_unlock(&_queue_mutex);
}

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static thread_t *_pop_thread(thread_queue_t **queue)
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{
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	thread_t *id;
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	thread_queue_t *item;

	thread_mutex_lock(&_queue_mutex);

	item = *queue;
	if (item == NULL) {
		thread_mutex_unlock(&_queue_mutex);
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		return NULL;
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	}

	*queue = item->next;
	item->next = NULL;
	id = item->thread_id;
	free(item);

	thread_mutex_unlock(&_queue_mutex);

	return id;
}

static void _build_pool(void)
{
	ice_config_t *config;
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	int i;
    thread_t *tid;
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	char buff[64];

	config = config_get_config();

	for (i = 0; i < config->threadpool_size; i++) {
		snprintf(buff, 64, "Connection Thread #%d", i);
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		tid = thread_create(buff, _handle_connection, NULL, THREAD_ATTACHED);
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		_push_thread(&_conhands, tid);
	}
}

static void _destroy_pool(void)
{
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	thread_t *id;
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	int i;

	i = 0;

	thread_cond_broadcast(&_pool_cond);
	id = _pop_thread(&_conhands);
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	while (id != NULL) {
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		thread_join(id);
		_signal_pool();
		id = _pop_thread(&_conhands);
	}
}

void connection_accept_loop(void)
{
	connection_t *con;

	_build_pool();

	while (global.running == ICE_RUNNING) {
		con = _accept_connection();

		if (con) {
			_add_connection(con);
			_signal_pool();
		}
	}

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    /* Give all the other threads notification to shut down */
    thread_cond_broadcast(&global.shutdown_cond);

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	_destroy_pool();

	/* wait for all the sources to shutdown */
	thread_rwlock_wlock(&_source_shutdown_rwlock);
	thread_rwlock_unlock(&_source_shutdown_rwlock);
}

static connection_t *_get_connection(void)
{
	con_queue_t *node = NULL;
	con_queue_t *oldnode = NULL;
	connection_t *con = NULL;

	thread_mutex_lock(&_queue_mutex);
	if (_queue) {
		node = _queue;
		while (node->next) {
			oldnode = node;
			node = node->next;
		}
		
		/* node is now the last node
		** and oldnode is the previous one, or NULL
		*/
		if (oldnode) oldnode->next = NULL;
		else (_queue) = NULL;
	}
	thread_mutex_unlock(&_queue_mutex);

	if (node) {
		con = node->con;
		free(node);
	}

	return con;
}

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int connection_create_source(connection_t *con, http_parser_t *parser, char *mount) {
	source_t *source;
	char *contenttype;
	/* check to make sure this source wouldn't
	** be over the limit
	*/
	global_lock();
	if (global.sources >= config_get_config()->source_limit) {
		INFO1("Source (%s) logged in, but there are too many sources", mount);
		global_unlock();
		return 0;
	}
	global.sources++;
	global_unlock();
	
	stats_event_inc(NULL, "sources");

	contenttype = httpp_getvar(parser, "content-type");

	if (contenttype != NULL) {
		format_type_t format = format_get_type(contenttype);
		if (format < 0) {
			WARN1("Content-type \"%s\" not supported, dropping source", contenttype);
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            goto fail;
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		} else {
			source = source_create(con, parser, mount, format);
		}
	} else {
		WARN0("No content-type header, cannot handle source");
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        goto fail;
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	}
	source->shutdown_rwlock = &_source_shutdown_rwlock;
	sock_set_blocking(con->sock, SOCK_NONBLOCK);
	thread_create("Source Thread", source_main, (void *)source, THREAD_DETACHED);
	return 1;
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fail:
    global_lock();
    global.sources--;
    global_unlock();

    stats_event_dec(NULL, "sources");
    return 0;
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}

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static void *_handle_connection(void *arg)
{
	char header[4096];
	connection_t *con;
	http_parser_t *parser;
	source_t *source;
	stats_connection_t *stats;
	avl_node *node;
	http_var_t *var;
	client_t *client;
	int bytes;
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	struct stat statbuf;
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	char *fullpath;
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    char *rawuri, *uri;
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	while (global.running == ICE_RUNNING) {
		memset(header, 0, 4096);

		thread_cond_wait(&_pool_cond);
		if (global.running != ICE_RUNNING) break;

		/* grab a connection and set the socket to blocking */
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		while ((con = _get_connection())) {
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			stats_event_inc(NULL, "connections");
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			sock_set_blocking(con->sock, SOCK_BLOCK);
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			/* fill header with the http header */
			if (util_read_header(con->sock, header, 4096) == 0) {
				/* either we didn't get a complete header, or we timed out */
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				connection_close(con);
				continue;
			}

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			parser = httpp_create_parser();
			httpp_initialize(parser, NULL);
			if (httpp_parse(parser, header, strlen(header))) {
				/* handle the connection or something */
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				if (strcmp("ICE", httpp_getvar(parser, HTTPP_VAR_PROTOCOL)) != 0 && strcmp("HTTP", httpp_getvar(parser, HTTPP_VAR_PROTOCOL)) != 0) {
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                    ERROR0("Bad HTTP protocol detected");
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					connection_close(con);
					httpp_destroy(parser);
					continue;
				}

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                rawuri = httpp_getvar(parser, HTTPP_VAR_URI);
                uri = util_normalise_uri(rawuri);

                if(!uri) {
					client = client_create(con, parser);
					bytes = sock_write(client->con->sock, "HTTP/1.0 404 File Not Found\r\nContent-Type: text/html\r\n\r\n"\
						   "<b>The path you requested was invalid.</b>\r\n");
                    if(bytes > 0) client->con->sent_bytes = bytes;
                    client_destroy(client);
                    continue;
                }
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				if (parser->req_type == httpp_req_source) {
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                    INFO1("Source logging in at mountpoint \"%s\"", uri);
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					stats_event_inc(NULL, "source_connections");
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					if (strcmp((httpp_getvar(parser, "ice-password") != NULL) ? httpp_getvar(parser, "ice-password") : "", (config_get_config()->source_password != NULL) ? config_get_config()->source_password : "") != 0) {
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						INFO1("Source (%s) attempted to login with bad password", uri);
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						connection_close(con);
						httpp_destroy(parser);
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                        free(uri);
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						continue;
					}
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					/* check to make sure this source has
					** a unique mountpoint
					*/

					avl_tree_rlock(global.source_tree);
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					if (source_find_mount(uri) != NULL) {
						INFO1("Source tried to log in as %s, but is already used", uri);
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						connection_close(con);
						httpp_destroy(parser);
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                        free(uri);
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						avl_tree_unlock(global.source_tree);
						continue;
					}
					avl_tree_unlock(global.source_tree);
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					if (!connection_create_source(con, parser, uri)) {
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						connection_close(con);
						httpp_destroy(parser);
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                        free(uri);
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					}

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					continue;
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				} else if (parser->req_type == httpp_req_stats) {
					stats_event_inc(NULL, "stats_connections");
					
					if (strcmp((httpp_getvar(parser, "ice-password") != NULL) ? httpp_getvar(parser, "ice-password") : "", (config_get_config()->source_password != NULL) ? config_get_config()->source_password : "") != 0) {
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                        ERROR0("Bad password for stats connection");
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						connection_close(con);
						httpp_destroy(parser);
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                        free(uri);
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						continue;
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					}
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					stats_event_inc(NULL, "stats");
					
					/* create stats connection and create stats handler thread */
					stats = (stats_connection_t *)malloc(sizeof(stats_connection_t));
					stats->parser = parser;
					stats->con = con;
					
					thread_create("Stats Connection", stats_connection, (void *)stats, THREAD_DETACHED);
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                    free(uri);
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					continue;
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				} else if (parser->req_type == httpp_req_play || parser->req_type == httpp_req_get) {
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                    DEBUG0("Client connected");
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					/* make a client */
					client = client_create(con, parser);
					stats_event_inc(NULL, "client_connections");
					
					/* there are several types of HTTP GET clients
					** media clients, which are looking for a source (eg, URI = /stream.ogg)
					** stats clients, which are looking for /stats.xml
					** and director server authorizers, which are looking for /GUID-xxxxxxxx (where xxxxxx is the GUID in question
					** we need to handle the latter two before the former, as the latter two
					** aren't subject to the limits.
					*/
					// TODO: add GUID-xxxxxx
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					if (strcmp(uri, "/stats.xml") == 0) {
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                        DEBUG0("Stats request, sending xml stats");
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						stats_sendxml(client);
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                        client_destroy(client);
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                        free(uri);
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						continue;
					}

					/* Here we are parsing the URI request to see
					** if the extension is .xsl, if so, then process
					** this request as an XSLT request
					*/
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                    fullpath = util_get_path_from_normalised_uri(uri);
					if (util_check_valid_extension(fullpath) == XSLT_CONTENT) {
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						/* If the file exists, then transform it, otherwise, write a 404 error */
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						if (stat(fullpath, &statbuf) == 0) {
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                            DEBUG0("Stats request, sending XSL transformed stats");
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							bytes = sock_write(client->con->sock, "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n");
                            if(bytes > 0) client->con->sent_bytes = bytes;
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                            stats_transform_xslt(client, fullpath);
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						}
						else {
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							bytes = sock_write(client->con->sock, "HTTP/1.0 404 File Not Found\r\nContent-Type: text/html\r\n\r\n"\
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								   "<b>The file you requested could not be found.</b>\r\n");
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                            if(bytes > 0) client->con->sent_bytes = bytes;
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						}
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                        free(fullpath);
                        free(uri);
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						client_destroy(client);
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						continue;
					}
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                    free(fullpath);
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                    if(strcmp(util_get_extension(uri), "m3u") == 0) {
                        char *sourceuri = strdup(uri);
                        char *dot = strrchr(sourceuri, '.');
                        *dot = 0;
					    avl_tree_rlock(global.source_tree);
    					source = source_find_mount(sourceuri);
	    				if (source) {
                            client->respcode = 200;
                            bytes = sock_write(client->con->sock,
                                    "HTTP/1.0 200 OK\r\nContent-Type: audio/x-mpegurl\r\n\r\nhttp://%s:%d%s", 
                                    config_get_config()->hostname, 
                                    config_get_config()->port,
                                    sourceuri
                                    );
                        }
                        else {
                            client->respcode = 404;
                            bytes = sock_write(client->con->sock,
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                                    "HTTP/1.0 404 Not Found\r\nContent-Type: text/html\r\n\r\n<b>The file you requested could not be found</b>\r\n");
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                        }
						avl_tree_unlock(global.source_tree);
                        if(bytes > 0) client->con->sent_bytes = bytes;
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                        free(sourceuri);
                        free(uri);
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						client_destroy(client);
						continue;
                    }

					if (strcmp(uri, "/allstreams.txt") == 0) {
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						if (strcmp((httpp_getvar(parser, "ice-password") != NULL) ? httpp_getvar(parser, "ice-password") : "", (config_get_config()->source_password != NULL) ? config_get_config()->source_password : "") != 0) {
							INFO0("Client attempted to fetch allstreams.txt with bad password");
							if (parser->req_type == httpp_req_get) {
								client->respcode = 404;
								bytes = sock_write(client->con->sock, "HTTP/1.0 404 Source Not Found\r\nContent-Type: text/html\r\n\r\n"\
										   "<b>The source you requested could not be found.</b>\r\n");
								if (bytes > 0) client->con->sent_bytes = bytes;
							}
						} else {
							avl_node *node;
							source_t *s;
							avl_tree_rlock(global.source_tree);
							node = avl_get_first(global.source_tree);
							while (node) {
								s = (source_t *)node->key;
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								bytes = sock_write(client->con->sock, "%s\r\n", s->mount);
                                if(bytes > 0) 
                                    client->con->sent_bytes += bytes;
                                else 
                                    break;

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								node = avl_get_next(node);
							}
							avl_tree_unlock(global.source_tree);
						}
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                        free(uri);
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						client_destroy(client);
						continue;
					}
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					global_lock();
					if (global.clients >= config_get_config()->client_limit) {
						if (parser->req_type == httpp_req_get) {
							client->respcode = 504;
							bytes = sock_write(client->con->sock, "HTTP/1.0 504 Server Full\r\nContent-Type: text/html\r\n\r\n"\
									   "<b>The server is already full.  Try again later.</b>\r\n");
							if (bytes > 0) client->con->sent_bytes = bytes;
						}
						client_destroy(client);
						global_unlock();
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                        free(uri);
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						continue;
					}
					global_unlock();
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					avl_tree_rlock(global.source_tree);
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					source = source_find_mount(uri);
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					if (source) {
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                        DEBUG0("Source found for client");
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						global_lock();
						if (global.clients >= config_get_config()->client_limit) {
							if (parser->req_type == httpp_req_get) {
								client->respcode = 504;
								bytes = sock_write(client->con->sock, "HTTP/1.0 504 Server Full\r\nContent-Type: text/html\r\n\r\n"\
										   "<b>The server is already full.  Try again later.</b>\r\n");
								if (bytes > 0) client->con->sent_bytes = bytes;
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							}
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                            free(uri);
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							client_destroy(client);
							global_unlock();
							continue;
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						}
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						global.clients++;
						global_unlock();
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						if (parser->req_type == httpp_req_get) {
							client->respcode = 200;
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							bytes = sock_write(client->con->sock, "HTTP/1.0 200 OK\r\nContent-Type: %s\r\n", format_get_mimetype(source->format->type));
                            if(bytes > 0) client->con->sent_bytes += bytes;
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							/* iterate through source http headers and send to client */
							avl_tree_rlock(source->parser->vars);
							node = avl_get_first(source->parser->vars);
							while (node) {
								var = (http_var_t *)node->key;
								if (strcasecmp(var->name, "ice-password") && !strncasecmp("ice-", var->name, 4)) {
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									bytes = sock_write(client->con->sock, "%s: %s\r\n", var->name, var->value);
                                    if(bytes > 0) client->con->sent_bytes += bytes;
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								}
								node = avl_get_next(node);
							}
							avl_tree_unlock(source->parser->vars);
							
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							bytes = sock_write(client->con->sock, "\r\n");
                            if(bytes > 0) client->con->sent_bytes += bytes;
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							sock_set_blocking(client->con->sock, SOCK_NONBLOCK);
						}
						
						avl_tree_wlock(source->pending_tree);
						avl_insert(source->pending_tree, (void *)client);
						avl_tree_unlock(source->pending_tree);
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					}
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					avl_tree_unlock(global.source_tree);
					
					if (!source) {
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                        DEBUG0("Source not found for client");
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						if (parser->req_type == httpp_req_get) {
							client->respcode = 404;
							bytes = sock_write(client->con->sock, "HTTP/1.0 404 Source Not Found\r\nContent-Type: text/html\r\n\r\n"\
									   "<b>The source you requested could not be found.</b>\r\n");
							if (bytes > 0) client->con->sent_bytes = bytes;
						}
						client_destroy(client);
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					}
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                    free(uri);
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					continue;
				} else {
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                    ERROR0("Wrong request type from client");
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					connection_close(con);
					httpp_destroy(parser);
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                    free(uri);
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					continue;
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				}
			} else {
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                ERROR0("HTTP request parsing failed");
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				connection_close(con);
				httpp_destroy(parser);
				continue;
			}
		}
	}

	thread_exit(0);

	return NULL;
}

void connection_close(connection_t *con)
{
	sock_close(con->sock);
	if (con->ip) free(con->ip);
	if (con->host) free(con->host);
	free(con);
}