Exemple #1
0
LWS_VISIBLE struct lws_context *
lws_create_context(struct lws_context_creation_info *info)
{
	struct lws_context *context = NULL;
#ifndef LWS_NO_DAEMONIZE
	int pid_daemon = get_daemonize_pid();
#endif
	int n, m;
#if defined(__ANDROID__)
	struct rlimit rt;
#endif

	lwsl_notice("Initial logging level %d\n", log_level);
	lwsl_notice("Libwebsockets version: %s\n", library_version);
#if LWS_POSIX
#ifdef LWS_USE_IPV6
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
		lwsl_notice("IPV6 compiled in and enabled\n");
	else
		lwsl_notice("IPV6 compiled in but disabled\n");
#else
	lwsl_notice("IPV6 not compiled in\n");
#endif
	lws_feature_status_libev(info);
	lws_feature_status_libuv(info);
#endif
	lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
	lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
	lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
	lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
	lwsl_info(" sizeof (*info)        : %u\n", sizeof(*info));
#if LWS_POSIX
	lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
#endif
	if (lws_plat_context_early_init())
		return NULL;

	context = lws_zalloc(sizeof(struct lws_context));
	if (!context) {
		lwsl_err("No memory for websocket context\n");
		return NULL;
	}
	if (info->pt_serv_buf_size)
		context->pt_serv_buf_size = info->pt_serv_buf_size;
	else
		context->pt_serv_buf_size = 4096;

	context->reject_service_keywords = info->reject_service_keywords;

	context->time_up = time(NULL);
#ifndef LWS_NO_DAEMONIZE
	if (pid_daemon) {
		context->started_with_parent = pid_daemon;
		lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
	}
#endif
#if defined(__ANDROID__)
		n = getrlimit ( RLIMIT_NOFILE,&rt);
		if (-1 == n) {
			lwsl_err("Get RLIMIT_NOFILE failed!\n");
			return NULL;
		}
		context->max_fds = rt.rlim_cur;
#else
		context->max_fds = getdtablesize();
#endif

	if (info->count_threads)
		context->count_threads = info->count_threads;
	else
		context->count_threads = 1;

	if (context->count_threads > LWS_MAX_SMP)
		context->count_threads = LWS_MAX_SMP;

	context->token_limits = info->token_limits;

	context->options = info->options;

	if (info->timeout_secs)
		context->timeout_secs = info->timeout_secs;
	else
		context->timeout_secs = AWAITING_TIMEOUT;

	context->ws_ping_pong_interval = info->ws_ping_pong_interval;

	lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);

	if (info->max_http_header_data)
		context->max_http_header_data = info->max_http_header_data;
	else
		if (info->max_http_header_data2)
			context->max_http_header_data =
					info->max_http_header_data2;
		else
			context->max_http_header_data = LWS_DEF_HEADER_LEN;
	if (info->max_http_header_pool)
		context->max_http_header_pool = info->max_http_header_pool;
	else
		context->max_http_header_pool = LWS_DEF_HEADER_POOL;

	/*
	 * Allocate the per-thread storage for scratchpad buffers,
	 * and header data pool
	 */
	for (n = 0; n < context->count_threads; n++) {
		context->pt[n].serv_buf = lws_zalloc(context->pt_serv_buf_size);
		if (!context->pt[n].serv_buf) {
			lwsl_err("OOM\n");
			return NULL;
		}

#ifdef LWS_USE_LIBUV
		context->pt[n].context = context;
#endif
		context->pt[n].tid = n;
		context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
						       context->max_http_header_pool);
		if (!context->pt[n].http_header_data)
			goto bail;

		context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
					      context->max_http_header_pool);
		for (m = 0; m < context->max_http_header_pool; m++)
			context->pt[n].ah_pool[m].data =
				(char *)context->pt[n].http_header_data +
				(m * context->max_http_header_data);
		if (!context->pt[n].ah_pool)
			goto bail;

		lws_pt_mutex_init(&context->pt[n]);
	}

	if (info->fd_limit_per_thread)
		context->fd_limit_per_thread = info->fd_limit_per_thread;
	else
		context->fd_limit_per_thread = context->max_fds /
					       context->count_threads;

	lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
		    context->fd_limit_per_thread);

	memset(&wsi, 0, sizeof(wsi));
	wsi.context = context;

	if (!info->ka_interval && info->ka_time > 0) {
		lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
		return NULL;
	}

#ifdef LWS_USE_LIBEV
	/* (Issue #264) In order to *avoid breaking backwards compatibility*, we
	 * enable libev mediated SIGINT handling with a default handler of
	 * lws_sigint_cb. The handler can be overridden or disabled
	 * by invoking lws_sigint_cfg after creating the context, but
	 * before invoking lws_initloop:
	 */
	context->use_ev_sigint = 1;
	context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
#endif /* LWS_USE_LIBEV */
#ifdef LWS_USE_LIBUV
	/* (Issue #264) In order to *avoid breaking backwards compatibility*, we
	 * enable libev mediated SIGINT handling with a default handler of
	 * lws_sigint_cb. The handler can be overridden or disabled
	 * by invoking lws_sigint_cfg after creating the context, but
	 * before invoking lws_initloop:
	 */
	context->use_ev_sigint = 1;
	context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
#endif

	lwsl_info(" mem: context:         %5u bytes (%d ctx + (%d thr x %d))\n",
		  sizeof(struct lws_context) +
		  (context->count_threads * context->pt_serv_buf_size),
		  sizeof(struct lws_context),
		  context->count_threads,
		  context->pt_serv_buf_size);

	lwsl_info(" mem: http hdr rsvd:   %5u bytes (%u thr x (%u + %u) x %u))\n",
		    (context->max_http_header_data +
		     sizeof(struct allocated_headers)) *
		    context->max_http_header_pool * context->count_threads,
		    context->count_threads,
		    context->max_http_header_data,
		    sizeof(struct allocated_headers),
		    context->max_http_header_pool);
	n = sizeof(struct lws_pollfd) * context->count_threads *
	    context->fd_limit_per_thread;
	context->pt[0].fds = lws_zalloc(n);
	if (context->pt[0].fds == NULL) {
		lwsl_err("OOM allocating %d fds\n", context->max_fds);
		goto bail;
	}
	lwsl_info(" mem: pollfd map:      %5u\n", n);

	if (info->server_string) {
		context->server_string = info->server_string;
		context->server_string_len = (short)
				strlen(context->server_string);
	} else {
		context->server_string = "libwebsockets";
		context->server_string_len = 13;
	}

#if LWS_MAX_SMP > 1
	/* each thread serves his own chunk of fds */
	for (n = 1; n < (int)info->count_threads; n++)
		context->pt[n].fds = context->pt[n - 1].fds +
				     context->fd_limit_per_thread;
#endif

	if (lws_plat_init(context, info))
		goto bail;

	lws_context_init_ssl_library(info);

	context->user_space = info->user;

	/*
	 * if he's not saying he'll make his own vhosts later then act
	 * compatibly and make a default vhost using the data in the info
	 */
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
		if (!lws_create_vhost(context, info)) {
			lwsl_err("Failed to create default vhost\n");
			return NULL;
		}

	lws_context_init_extensions(info, context);

	lwsl_notice(" mem: per-conn:        %5u bytes + protocol rx buf\n",
		    sizeof(struct lws));

	strcpy(context->canonical_hostname, "unknown");
	lws_server_get_canonical_hostname(context, info);

	context->uid = info->uid;
	context->gid = info->gid;

	/*
	 * drop any root privs for this process
	 * to listen on port < 1023 we would have needed root, but now we are
	 * listening, we don't want the power for anything else
	 */
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS))
		lws_plat_drop_app_privileges(info);

	/*
	 * give all extensions a chance to create any per-context
	 * allocations they need
	 */
	if (info->port != CONTEXT_PORT_NO_LISTEN) {
		if (lws_ext_cb_all_exts(context, NULL,
			LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
			goto bail;
	} else
		if (lws_ext_cb_all_exts(context, NULL,
			LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
			goto bail;

	return context;

bail:
	lws_context_destroy(context);
	return NULL;
}
Exemple #2
0
/**
 * lws_create_context() - Create the websocket handler
 * @info:	pointer to struct with parameters
 *
 *	This function creates the listening socket (if serving) and takes care
 *	of all initialization in one step.
 *
 *	After initialization, it returns a struct lws_context * that
 *	represents this server.  After calling, user code needs to take care
 *	of calling lws_service() with the context pointer to get the
 *	server's sockets serviced.  This must be done in the same process
 *	context as the initialization call.
 *
 *	The protocol callback functions are called for a handful of events
 *	including http requests coming in, websocket connections becoming
 *	established, and data arriving; it's also called periodically to allow
 *	async transmission.
 *
 *	HTTP requests are sent always to the FIRST protocol in @protocol, since
 *	at that time websocket protocol has not been negotiated.  Other
 *	protocols after the first one never see any HTTP callack activity.
 *
 *	The server created is a simple http server by default; part of the
 *	websocket standard is upgrading this http connection to a websocket one.
 *
 *	This allows the same server to provide files like scripts and favicon /
 *	images or whatever over http and dynamic data over websockets all in
 *	one place; they're all handled in the user callback.
 */
LWS_VISIBLE struct lws_context *
lws_create_context(struct lws_context_creation_info *info)
{
	struct lws_context *context = NULL;
	struct lws wsi;
#ifndef LWS_NO_DAEMONIZE
	int pid_daemon = get_daemonize_pid();
#endif
	char *p;
	int n, m;

	lwsl_notice("Initial logging level %d\n", log_level);
	lwsl_notice("Libwebsockets version: %s\n", library_version);
#if LWS_POSIX
#ifdef LWS_USE_IPV6
	if (!(info->options & LWS_SERVER_OPTION_DISABLE_IPV6))
		lwsl_notice("IPV6 compiled in and enabled\n");
	else
		lwsl_notice("IPV6 compiled in but disabled\n");
#else
	lwsl_notice("IPV6 not compiled in\n");
#endif
	lws_feature_status_libev(info);
#endif
	lwsl_info(" LWS_DEF_HEADER_LEN    : %u\n", LWS_DEF_HEADER_LEN);
	lwsl_info(" LWS_MAX_PROTOCOLS     : %u\n", LWS_MAX_PROTOCOLS);
	lwsl_info(" LWS_MAX_SMP           : %u\n", LWS_MAX_SMP);
	lwsl_info(" SPEC_LATEST_SUPPORTED : %u\n", SPEC_LATEST_SUPPORTED);
	lwsl_info(" sizeof (*info)        : %u\n", sizeof(*info));
#if LWS_POSIX
	lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
#endif
	if (lws_plat_context_early_init())
		return NULL;

	context = lws_zalloc(sizeof(struct lws_context));
	if (!context) {
		lwsl_err("No memory for websocket context\n");
		return NULL;
	}
#ifndef LWS_NO_DAEMONIZE
	if (pid_daemon) {
		context->started_with_parent = pid_daemon;
		lwsl_notice(" Started with daemon pid %d\n", pid_daemon);
	}
#endif
	context->max_fds = getdtablesize();

	if (info->count_threads)
		context->count_threads = info->count_threads;
	else
		context->count_threads = 1;

	if (context->count_threads > LWS_MAX_SMP)
		context->count_threads = LWS_MAX_SMP;

	context->protocols = info->protocols;
	context->token_limits = info->token_limits;
	context->listen_port = info->port;
	context->http_proxy_port = 0;
	context->http_proxy_address[0] = '\0';
	context->options = info->options;
	context->iface = info->iface;
	context->ka_time = info->ka_time;
	context->ka_interval = info->ka_interval;
	context->ka_probes = info->ka_probes;
	if (info->timeout_secs)
		context->timeout_secs = info->timeout_secs;
	else
		context->timeout_secs = AWAITING_TIMEOUT;

	lwsl_info(" default timeout (secs): %u\n", context->timeout_secs);

	if (info->max_http_header_data)
		context->max_http_header_data = info->max_http_header_data;
	else
		context->max_http_header_data = LWS_DEF_HEADER_LEN;
	if (info->max_http_header_pool)
		context->max_http_header_pool = info->max_http_header_pool;
	else
		context->max_http_header_pool = LWS_DEF_HEADER_POOL;

	/*
	 * Allocate the per-thread storage for scratchpad buffers,
	 * and header data pool
	 */
	for (n = 0; n < context->count_threads; n++) {
		context->pt[n].serv_buf = lws_zalloc(LWS_MAX_SOCKET_IO_BUF);
		if (!context->pt[n].serv_buf) {
			lwsl_err("OOM\n");
			return NULL;
		}

		context->pt[n].context = context;
		context->pt[n].tid = n;
		context->pt[n].http_header_data = lws_malloc(context->max_http_header_data *
						       context->max_http_header_pool);
		if (!context->pt[n].http_header_data)
			goto bail;

		context->pt[n].ah_pool = lws_zalloc(sizeof(struct allocated_headers) *
					      context->max_http_header_pool);
		for (m = 0; m < context->max_http_header_pool; m++)
			context->pt[n].ah_pool[m].data =
				(char *)context->pt[n].http_header_data +
				(m * context->max_http_header_data);
		if (!context->pt[n].ah_pool)
			goto bail;

		lws_pt_mutex_init(&context->pt[n]);
	}

	if (info->fd_limit_per_thread)
		context->fd_limit_per_thread = info->fd_limit_per_thread;
	else
		context->fd_limit_per_thread = context->max_fds /
					       context->count_threads;

	lwsl_notice(" Threads: %d each %d fds\n", context->count_threads,
		    context->fd_limit_per_thread);

	memset(&wsi, 0, sizeof(wsi));
	wsi.context = context;

	if (!info->ka_interval && info->ka_time > 0) {
		lwsl_err("info->ka_interval can't be 0 if ka_time used\n");
		return NULL;
	}

#ifdef LWS_USE_LIBEV
	/* (Issue #264) In order to *avoid breaking backwards compatibility*, we
	 * enable libev mediated SIGINT handling with a default handler of
	 * lws_sigint_cb. The handler can be overridden or disabled
	 * by invoking lws_sigint_cfg after creating the context, but
	 * before invoking lws_initloop:
	 */
	context->use_ev_sigint = 1;
	context->lws_ev_sigint_cb = &lws_ev_sigint_cb;
#endif /* LWS_USE_LIBEV */
#ifdef LWS_USE_LIBUV
	/* (Issue #264) In order to *avoid breaking backwards compatibility*, we
	 * enable libev mediated SIGINT handling with a default handler of
	 * lws_sigint_cb. The handler can be overridden or disabled
	 * by invoking lws_sigint_cfg after creating the context, but
	 * before invoking lws_initloop:
	 */
	context->use_ev_sigint = 1;
	context->lws_uv_sigint_cb = &lws_uv_sigint_cb;
#endif

	lwsl_info(" mem: context:         %5u bytes (%d ctx + (%d thr x %d))\n",
		  sizeof(struct lws_context) +
		  (context->count_threads * LWS_MAX_SOCKET_IO_BUF),
		  sizeof(struct lws_context),
		  context->count_threads,
		  LWS_MAX_SOCKET_IO_BUF);

	lwsl_info(" mem: http hdr rsvd:   %5u bytes (%u thr x (%u + %u) x %u))\n",
		    (context->max_http_header_data +
		     sizeof(struct allocated_headers)) *
		    context->max_http_header_pool * context->count_threads,
		    context->count_threads,
		    context->max_http_header_data,
		    sizeof(struct allocated_headers),
		    context->max_http_header_pool);
	n = sizeof(struct lws_pollfd) * context->count_threads *
	    context->fd_limit_per_thread;
	context->pt[0].fds = lws_zalloc(n);
	if (context->pt[0].fds == NULL) {
		lwsl_err("OOM allocating %d fds\n", context->max_fds);
		goto bail;
	}
	lwsl_info(" mem: pollfd map:      %5u\n", n);

#if LWS_MAX_SMP > 1
	/* each thread serves his own chunk of fds */
	for (n = 1; n < (int)info->count_threads; n++)
		context->pt[n].fds = context->pt[n - 1].fds +
				     context->fd_limit_per_thread;
#endif

	if (lws_plat_init(context, info))
		goto bail;

	lws_context_init_extensions(info, context);

	context->user_space = info->user;

	lwsl_notice(" mem: per-conn:        %5u bytes + protocol rx buf\n",
		    sizeof(struct lws));

	strcpy(context->canonical_hostname, "unknown");
	lws_server_get_canonical_hostname(context, info);

	/* either use proxy from info, or try get it from env var */

	if (info->http_proxy_address) {
		/* override for backwards compatibility */
		if (info->http_proxy_port)
			context->http_proxy_port = info->http_proxy_port;
		lws_set_proxy(context, info->http_proxy_address);
	} else {
#ifdef LWS_HAVE_GETENV
		p = getenv("http_proxy");
		if (p)
			lws_set_proxy(context, p);
#endif
	}

	if (lws_context_init_server_ssl(info, context))
		goto bail;

	if (lws_context_init_client_ssl(info, context))
		goto bail;

	if (lws_context_init_server(info, context))
		goto bail;

	/*
	 * drop any root privs for this process
	 * to listen on port < 1023 we would have needed root, but now we are
	 * listening, we don't want the power for anything else
	 */
	lws_plat_drop_app_privileges(info);

	/* initialize supported protocols */

	for (context->count_protocols = 0;
	     info->protocols[context->count_protocols].callback;
	     context->count_protocols++)
		/*
		 * inform all the protocols that they are doing their one-time
		 * initialization if they want to.
		 *
		 * NOTE the wsi is all zeros except for the context pointer
		 * so lws_get_context(wsi) can work in the callback.
		 */
		info->protocols[context->count_protocols].callback(&wsi,
				LWS_CALLBACK_PROTOCOL_INIT, NULL, NULL, 0);

	/*
	 * give all extensions a chance to create any per-context
	 * allocations they need
	 */
	if (info->port != CONTEXT_PORT_NO_LISTEN) {
		if (lws_ext_cb_all_exts(context, NULL,
			LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT, NULL, 0) < 0)
			goto bail;
	} else
		if (lws_ext_cb_all_exts(context, NULL,
			LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT, NULL, 0) < 0)
			goto bail;

	return context;

bail:
	lws_context_destroy(context);
	return NULL;
}