connection.c 21.7 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 "logging.h"
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#include "xslt.h"
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#include "fserve.h"
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#include "yp.h"
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#include "source.h"
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#include "geturl.h"
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#include "format.h"
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#include "format_mp3.h"
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#include "event.h"
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#include "admin.h"
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#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_type *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;
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    con->event_number = EVENT_NO_EVENT;
    con->event = NULL;

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	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, 100) <= 0) {
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		return NULL;
	}

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	/* malloc enough room for a full IP address (including ipv6) */
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	ip = (char *)malloc(MAX_ADDR_LEN);
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	sock = sock_accept(global.serversock, ip, MAX_ADDR_LEN);
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	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_type *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_type *_pop_thread(thread_queue_t **queue)
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{
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	thread_type *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;
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    thread_type *tid;
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	char buff[64];
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    int threadpool_size;
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	config = config_get_config();
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    threadpool_size = config->threadpool_size;
    config_release_config();
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	for (i = 0; i < threadpool_size; i++) {
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		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_type *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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void connection_inject_event(int eventnum, void *event_data) {
    connection_t *con = calloc(1, sizeof(connection_t));

    con->event_number = eventnum;
    con->event = event_data;

    _add_connection(con);
    _signal_pool();
}

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/* TODO: Make this return an appropriate error code so that we can use HTTP
 * codes where appropriate
 */
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int connection_create_source(client_t *client, connection_t *con, http_parser_t *parser, char *mount) {
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	source_t *source;
	char *contenttype;
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    mount_proxy *mountproxy, *mountinfo = NULL;
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    int source_limit;
    ice_config_t *config;

    config = config_get_config();
    source_limit = config->source_limit;
    config_release_config();
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	/* check to make sure this source wouldn't
	** be over the limit
	*/
	global_lock();
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	if (global.sources >= source_limit) {
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		INFO1("Source (%s) logged in, but there are too many sources", mount);
		global_unlock();
		return 0;
	}
	global.sources++;
	global_unlock();
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	stats_event_inc(NULL, "sources");
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    config = config_get_config();
    mountproxy = config->mounts;
    thread_mutex_lock(&(config_locks()->mounts_lock));
    config_release_config();

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    while(mountproxy) {
        if(!strcmp(mountproxy->mountname, mount)) {
            mountinfo = mountproxy;
            break;
        }
        mountproxy = mountproxy->next;
    }
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	contenttype = httpp_getvar(parser, "content-type");

	if (contenttype != NULL) {
		format_type_t format = format_get_type(contenttype);
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		if (format == FORMAT_ERROR) {
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			WARN1("Content-type \"%s\" not supported, dropping source", contenttype);
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            thread_mutex_unlock(&(config_locks()->mounts_lock));
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            goto fail;
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		} else {
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			source = source_create(client, con, parser, mount, 
                    format, mountinfo);
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            thread_mutex_unlock(&(config_locks()->mounts_lock));
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		}
	} else {
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        format_type_t format = FORMAT_TYPE_MP3;
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		ERROR0("No content-type header, falling back to backwards compatibility mode for icecast 1.x relays. Assuming content is mp3.");
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        source = source_create(client, con, parser, mount, format, mountinfo);
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        thread_mutex_unlock(&(config_locks()->mounts_lock));
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	}
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    source->send_return = 1;
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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 int _check_pass_http(http_parser_t *parser, 
        char *correctuser, char *correctpass)
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{
    /* This will look something like "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" */
    char *header = httpp_getvar(parser, "authorization");
    char *userpass, *tmp;
    char *username, *password;

    if(header == NULL)
        return 0;

    if(strncmp(header, "Basic ", 6))
        return 0;

    userpass = util_base64_decode(header+6);
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    if(userpass == NULL) {
        WARN1("Base64 decode of Authorization header \"%s\" failed",
                header+6);
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        return 0;
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    }
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    tmp = strchr(userpass, ':');
    if(!tmp) {
        free(userpass);
        return 0;
    }
    *tmp = 0;
    username = userpass;
    password = tmp+1;

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    if(strcmp(username, correctuser) || strcmp(password, correctpass)) {
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        free(userpass);
        return 0;
    }
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    free(userpass);
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    return 1;
}

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static int _check_pass_ice(http_parser_t *parser, char *correctpass)
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{
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    char *password;
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    password = httpp_getvar(parser, "ice-password");
    if(!password)
        password = "";

	if (strcmp(password, correctpass))
        return 0;
    else
        return 1;
}

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int connection_check_relay_pass(http_parser_t *parser)
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{
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    ice_config_t *config = config_get_config();
    char *pass = config->relay_password;
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    if(!pass)
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        pass = config->source_password;
    config_release_config();
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    return _check_pass_http(parser, "relay", pass);
}

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int connection_check_admin_pass(http_parser_t *parser)
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{
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    ice_config_t *config = config_get_config();
    char *pass = config->admin_password;
    char *user = config->admin_username;
    config_release_config();

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    if(!pass || !user)
        return 0;

    return _check_pass_http(parser, "admin", pass);
}

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int connection_check_source_pass(http_parser_t *parser, char *mount)
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{
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    ice_config_t *config = config_get_config();
    char *pass = config->source_password;
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    char *user = "source";
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    int ret;
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    int ice_login = config->ice_login;

    mount_proxy *mountinfo = config->mounts;
    thread_mutex_lock(&(config_locks()->mounts_lock));
    config_release_config();
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    while(mountinfo) {
        if(!strcmp(mountinfo->mountname, mount)) {
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            if(mountinfo->password)
                pass = mountinfo->password;
            if(mountinfo->username)
                user = mountinfo->username;
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            break;
        }
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        mountinfo = mountinfo->next;
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    }

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

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    if(!pass) {
        WARN0("No source password set, rejecting source");
        return 0;
    }

    ret = _check_pass_http(parser, user, pass);
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    if(!ret && ice_login)
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    {
        ret = _check_pass_ice(parser, pass);
        if(ret)
            WARN0("Source is using deprecated icecast login");
    }

    return ret;
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}

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static void _handle_source_request(connection_t *con, 
        http_parser_t *parser, char *uri)
{
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    client_t *client;

	client = client_create(con, parser);

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    INFO1("Source logging in at mountpoint \"%s\"", uri);
    stats_event_inc(NULL, "source_connections");
				
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	if (!connection_check_source_pass(parser, uri)) {
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		INFO1("Source (%s) attempted to login with invalid or missing password", uri);
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        client_send_401(client);
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        return;
	}

	/* check to make sure this source has
	** a unique mountpoint
	*/

	avl_tree_rlock(global.source_tree);
	if (source_find_mount(uri) != NULL) {
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		avl_tree_unlock(global.source_tree);
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		INFO1("Source tried to log in as %s, but mountpoint is already used", uri);
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        client_send_404(client, "Mountpoint in use");
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		return;
	}
	avl_tree_unlock(global.source_tree);

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	if (!connection_create_source(client, con, parser, uri)) {
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        client_send_404(client, "Mountpoint in use");
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	}
}

static void _handle_stats_request(connection_t *con, 
        http_parser_t *parser, char *uri)
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{
	stats_connection_t *stats;
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	stats_event_inc(NULL, "stats_connections");
				
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	if (!connection_check_admin_pass(parser)) {
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        ERROR0("Bad password for stats connection");
		connection_close(con);
		httpp_destroy(parser);
        return;
	}
					
	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);
}

static void _handle_get_request(connection_t *con,
        http_parser_t *parser, char *uri)
{
    char *fullpath;
	client_t *client;
    int bytes;
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	struct stat statbuf;
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	source_t *source;
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    int fileserve;
    char *host;
    int port;
    ice_config_t *config;
    int client_limit;

    config = config_get_config();
    fileserve = config->fileserve;
    host = config->hostname;
    port = config->port;
    client_limit = config->client_limit;
    config_release_config();

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    DEBUG0("Client connected");

	/* 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)
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	** stats clients, which are looking for /admin/stats.xml
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	** and director server authorizers, which are looking for /GUID-xxxxxxxx 
    ** (where xxxxxx is the GUID in question) - this isn't implemented yet.
	** 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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    /* Dispatch all admin requests */
	if (strncmp(uri, "/admin/", 7) == 0) {
        admin_handle_request(client, uri);
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        return;
    }

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	/* Here we are parsing the URI request to see
	** if the extension is .xsl, if so, then process
	** this request as an XSLT request
	*/
    fullpath = util_get_path_from_normalised_uri(uri);
    if (util_check_valid_extension(fullpath) == XSLT_CONTENT) {
    	/* If the file exists, then transform it, otherwise, write a 404 */
    	if (stat(fullpath, &statbuf) == 0) {
            DEBUG0("Stats request, sending XSL transformed stats");
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            client->respcode = 200;
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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;
            stats_transform_xslt(client, fullpath);
		    client_destroy(client);
    	}
	    else {
            client_send_404(client, "The file you requested could not be found");
    	}
        free(fullpath);
        return;
	}
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    else if(fileserve && stat(fullpath, &statbuf) == 0) 
    {
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        fserve_client_create(client, fullpath);
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        free(fullpath);
        return;
    }
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    free(fullpath);

    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\n"
                    "Content-Type: audio/x-mpegurl\r\n\r\n"
                    "http://%s:%d%s", 
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                    host, 
                    port,
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                    sourceuri
                    );
            if(bytes > 0) client->con->sent_bytes = bytes;
    	    client_destroy(client);
        }
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        else if(fileserve) {
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            fullpath = util_get_path_from_normalised_uri(sourceuri);
            if(stat(fullpath, &statbuf) == 0) {
                fserve_client_create(client, fullpath);
                free(fullpath);
            }
            else {
                free(fullpath);
                fullpath = util_get_path_from_normalised_uri(uri);
                if(stat(fullpath, &statbuf) == 0) {
                    fserve_client_create(client, fullpath);
                    free(fullpath);
                }
                else {
                    free(fullpath);
                    client_send_404(client, 
                            "The file you requested could not be found");
                }
            }
        }
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        else {
            client_send_404(client, "The file you requested could not be found");
        }
		avl_tree_unlock(global.source_tree);
        free(sourceuri);
        return;
    }

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	if (strcmp(uri, "/admin/streamlist") == 0) {
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		if (!connection_check_relay_pass(parser)) {
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			INFO0("Client attempted to fetch /admin/streamlist with bad password");
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            client_send_401(client);
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		} else {
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			avl_node *node;
			source_t *s;

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            client->respcode = 200;
            bytes = sock_write(client->con->sock,
                    "HTTP/1.0 200 OK\r\n\r\n");
            if(bytes > 0) client->con->sent_bytes = bytes;

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			avl_tree_rlock(global.source_tree);
			node = avl_get_first(global.source_tree);
			while (node) {
				s = (source_t *)node->key;
				bytes = sock_write(client->con->sock, "%s\r\n", s->mount);
                if(bytes > 0) client->con->sent_bytes += bytes;
                else break;

				node = avl_get_next(node);
			}
			avl_tree_unlock(global.source_tree);
		    client_destroy(client);
		}
        return;
	}
				
	global_lock();
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	if (global.clients >= client_limit) {
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        client_send_504(client,
                "The server is already full. Try again later.");
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		global_unlock();
        return;
	}
	global_unlock();
					
	avl_tree_rlock(global.source_tree);
	source = source_find_mount(uri);
	if (source) {
        DEBUG0("Source found for client");
						
		global_lock();
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		if (global.clients >= client_limit) {
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            client_send_504(client, 
                    "The server is already full. Try again later.");
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			global_unlock();
            avl_tree_unlock(global.source_tree);
            return;
		}
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        else if(source->max_listeners != -1 && 
                source->listeners >= source->max_listeners) 
        {
            client_send_504(client, 
                    "Too many clients on this mountpoint. Try again later.");
			global_unlock();
            avl_tree_unlock(global.source_tree);
            return;
        }
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		global.clients++;
		global_unlock();
						
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        client->format_data = source->format->create_client_data(
                source->format, source, client);

        source->format->client_send_headers(source->format, source, client);
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		bytes = sock_write(client->con->sock, "\r\n");
        if(bytes > 0) client->con->sent_bytes += bytes;
							
    	sock_set_blocking(client->con->sock, SOCK_NONBLOCK);
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        sock_set_nodelay(client->con->sock);
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		avl_tree_wlock(source->pending_tree);
		avl_insert(source->pending_tree, (void *)client);
		avl_tree_unlock(source->pending_tree);
	}
					
	avl_tree_unlock(global.source_tree);
					
	if (!source) {
        DEBUG0("Source not found for client");
        client_send_404(client, "The source you requested could not be found.");
	}
}

static void *_handle_connection(void *arg)
{
	char header[4096];
	connection_t *con;
	http_parser_t *parser;
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    char *rawuri, *uri;
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	client_t *client;
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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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            /* Handle meta-connections */
            if(con->event_number > 0) {
                switch(con->event_number) {
                    case EVENT_CONFIG_READ:
                        event_config_read(con->event);
                        break;
                    default:
                        ERROR1("Unknown event number: %d", con->event_number);
                        break;
                }
                free(con);
                continue;
            }

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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)) &&
                    strcmp("HTTP", httpp_getvar(parser, HTTPP_VAR_PROTOCOL))) {
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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);
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                    client_send_404(client, "The path you requested was invalid");
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                    continue;
                }
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				if (parser->req_type == httpp_req_source) {
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                    _handle_source_request(con, parser, uri);
                }
                else if (parser->req_type == httpp_req_stats) {
                    _handle_stats_request(con, parser, uri);
                }
                else if (parser->req_type == httpp_req_get) {
                    _handle_get_request(con, parser, uri);
                }
                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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			} 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);
}