context.c

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 */

#include "core/private.h"

#ifndef LWS_BUILD_HASH
#define LWS_BUILD_HASH "unknown-build-hash"
#endif

const struct lws_role_ops *available_roles[] = {
#if defined(LWS_ROLE_H2)
	&role_ops_h2,
#endif
#if defined(LWS_ROLE_H1)
	&role_ops_h1,
#endif
#if defined(LWS_ROLE_WS)
	&role_ops_ws,
#endif
#if defined(LWS_ROLE_DBUS)
	&role_ops_dbus,
#endif
	NULL
};

const struct lws_event_loop_ops *available_event_libs[] = {
#if defined(LWS_WITH_POLL)
	&event_loop_ops_poll,
#endif
#if defined(LWS_WITH_LIBUV)
	&event_loop_ops_uv,
#endif
#if defined(LWS_WITH_LIBEVENT)
	&event_loop_ops_event,
#endif
#if defined(LWS_WITH_LIBEV)
	&event_loop_ops_ev,
#endif
	NULL
};

static const char *library_version = LWS_LIBRARY_VERSION " " LWS_BUILD_HASH;

/**
 * lws_get_library_version: get version and git hash library built from
 *
 *	returns a const char * to a string like "1.1 178d78c"
 *	representing the library version followed by the git head hash it
 *	was built from
 */
LWS_VISIBLE const char *
lws_get_library_version(void)
{
	return library_version;
}

int
lws_role_call_alpn_negotiated(struct lws *wsi, const char *alpn)
{
#if defined(LWS_WITH_TLS)
	if (!alpn)
		return 0;

	lwsl_info("%s: '%s'\n", __func__, alpn);

	LWS_FOR_EVERY_AVAILABLE_ROLE_START(ar)
		if (ar->alpn && !strcmp(ar->alpn, alpn) && ar->alpn_negotiated)
			return ar->alpn_negotiated(wsi, alpn);
	LWS_FOR_EVERY_AVAILABLE_ROLE_END;
#endif
	return 0;
}

#if !defined(LWS_WITHOUT_SERVER)
int
lws_role_call_adoption_bind(struct lws *wsi, int type, const char *prot)
{
	LWS_FOR_EVERY_AVAILABLE_ROLE_START(ar)
		if (ar->adoption_bind)
			if (ar->adoption_bind(wsi, type, prot))
				return 0;
	LWS_FOR_EVERY_AVAILABLE_ROLE_END;

	/* fall back to raw socket role if, eg, h1 not configured */

	if (role_ops_raw_skt.adoption_bind &&
	    role_ops_raw_skt.adoption_bind(wsi, type, prot))
		return 0;

	/* fall back to raw file role if, eg, h1 not configured */

	if (role_ops_raw_file.adoption_bind &&
	    role_ops_raw_file.adoption_bind(wsi, type, prot))
		return 0;

	return 1;
}
#endif

#if !defined(LWS_WITHOUT_CLIENT)
int
lws_role_call_client_bind(struct lws *wsi,
			  const struct lws_client_connect_info *i)
{
	LWS_FOR_EVERY_AVAILABLE_ROLE_START(ar)
		if (ar->client_bind) {
			int m = ar->client_bind(wsi, i);
			if (m < 0)
				return m;
			if (m)
				return 0;
		}
	LWS_FOR_EVERY_AVAILABLE_ROLE_END;

	/* fall back to raw socket role if, eg, h1 not configured */

	if (role_ops_raw_skt.client_bind &&
	    role_ops_raw_skt.client_bind(wsi, i))
		return 0;

	return 1;
}
#endif

static const char * const mount_protocols[] = {
	"http://",
	"https://",
	"file://",
	"cgi://",
	">http://",
	">https://",
	"callback://"
};

LWS_VISIBLE void *
lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost,
			    const struct lws_protocols *prot, int size)
{
	int n = 0;

	/* allocate the vh priv array only on demand */
	if (!vhost->protocol_vh_privs) {
		vhost->protocol_vh_privs = (void **)lws_zalloc(
				vhost->count_protocols * sizeof(void *),
				"protocol_vh_privs");
		if (!vhost->protocol_vh_privs)
			return NULL;
	}

	while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
		n++;

	if (n == vhost->count_protocols) {
		n = 0;
		while (n < vhost->count_protocols &&
		       strcmp(vhost->protocols[n].name, prot->name))
			n++;

		if (n == vhost->count_protocols)
			return NULL;
	}

	vhost->protocol_vh_privs[n] = lws_zalloc(size, "vh priv");
	return vhost->protocol_vh_privs[n];
}

LWS_VISIBLE void *
lws_protocol_vh_priv_get(struct lws_vhost *vhost,
			 const struct lws_protocols *prot)
{
	int n = 0;

	if (!vhost || !vhost->protocol_vh_privs || !prot)
		return NULL;

	while (n < vhost->count_protocols && &vhost->protocols[n] != prot)
		n++;

	if (n == vhost->count_protocols) {
		n = 0;
		while (n < vhost->count_protocols &&
		       strcmp(vhost->protocols[n].name, prot->name))
			n++;

		if (n == vhost->count_protocols) {
			lwsl_err("%s: unknown protocol %p\n", __func__, prot);
			return NULL;
		}
	}

	return vhost->protocol_vh_privs[n];
}

static const struct lws_protocol_vhost_options *
lws_vhost_protocol_options(struct lws_vhost *vh, const char *name)
{
	const struct lws_protocol_vhost_options *pvo = vh->pvo;

	if (!name)
		return NULL;

	while (pvo) {
		if (!strcmp(pvo->name, name))
			return pvo;
		pvo = pvo->next;
	}

	return NULL;
}

/*
 * inform every vhost that hasn't already done it, that
 * his protocols are initializing
 */
LWS_VISIBLE int
lws_protocol_init(struct lws_context *context)
{
	struct lws_vhost *vh = context->vhost_list;
	const struct lws_protocol_vhost_options *pvo, *pvo1;
	struct lws wsi;
	int n, any = 0;

	if (context->doing_protocol_init)
		return 0;

	context->doing_protocol_init = 1;

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

	lwsl_info("%s\n", __func__);

	while (vh) {
		wsi.vhost = vh;

		/* only do the protocol init once for a given vhost */
		if (vh->created_vhost_protocols ||
		    (vh->options & LWS_SERVER_OPTION_SKIP_PROTOCOL_INIT))
			goto next;

		/* initialize supported protocols on this vhost */

		for (n = 0; n < vh->count_protocols; n++) {
			wsi.protocol = &vh->protocols[n];
			if (!vh->protocols[n].name)
				continue;
			pvo = lws_vhost_protocol_options(vh,
							 vh->protocols[n].name);
			if (pvo) {
				/*
				 * linked list of options specific to
				 * vh + protocol
				 */
				pvo1 = pvo;
				pvo = pvo1->options;

				while (pvo) {
					lwsl_debug(
						"    vhost \"%s\", "
						"protocol \"%s\", "
						"option \"%s\"\n",
							vh->name,
							vh->protocols[n].name,
							pvo->name);

					if (!strcmp(pvo->name, "default")) {
						lwsl_info("Setting default "
						   "protocol for vh %s to %s\n",
						   vh->name,
						   vh->protocols[n].name);
						vh->default_protocol_index = n;
					}
					if (!strcmp(pvo->name, "raw")) {
						lwsl_info("Setting raw "
						   "protocol for vh %s to %s\n",
						   vh->name,
						   vh->protocols[n].name);
						vh->raw_protocol_index = n;
					}
					pvo = pvo->next;
				}

				pvo = pvo1->options;
			}

#if defined(LWS_WITH_TLS)
			any |= !!vh->tls.ssl_ctx;
#endif

			/*
			 * 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, vh
			 * + protocol ptrs so lws_get_context(wsi) etc can work
			 */
			if (vh->protocols[n].callback(&wsi,
					LWS_CALLBACK_PROTOCOL_INIT, NULL,
					(void *)pvo, 0)) {
				lws_free(vh->protocol_vh_privs[n]);
				vh->protocol_vh_privs[n] = NULL;
				lwsl_err("%s: protocol %s failed init\n",
					 __func__, vh->protocols[n].name);

				return 1;
			}
		}

		vh->created_vhost_protocols = 1;
next:
		vh = vh->vhost_next;
	}

	context->doing_protocol_init = 0;

	if (!context->protocol_init_done)
		lws_finalize_startup(context);

	context->protocol_init_done = 1;

	if (any)
		lws_tls_check_all_cert_lifetimes(context);

	return 0;
}


/* list of supported protocols and callbacks */

static const struct lws_protocols protocols_dummy[] = {
	/* first protocol must always be HTTP handler */

	{
		"http-only",			/* name */
		lws_callback_http_dummy,	/* callback */
		0,				/* per_session_data_size */
		0,				/* rx_buffer_size */
		0,				/* id */
		NULL,				/* user */
		0				/* tx_packet_size */
	},
	/*
	 * the other protocols are provided by lws plugins
	 */
	{ NULL, NULL, 0, 0, 0, NULL, 0} /* terminator */
};

#ifdef LWS_PLAT_OPTEE
#undef LWS_HAVE_GETENV
#endif

LWS_VISIBLE struct lws_vhost *
lws_create_vhost(struct lws_context *context,
		 const struct lws_context_creation_info *info)
{
	struct lws_vhost *vh = lws_zalloc(sizeof(*vh), "create vhost"),
			 **vh1 = &context->vhost_list;
	const struct lws_http_mount *mounts;
	const struct lws_protocols *pcols = info->protocols;
	const struct lws_protocol_vhost_options *pvo;
#ifdef LWS_WITH_PLUGINS
	struct lws_plugin *plugin = context->plugin_list;
#endif
	struct lws_protocols *lwsp;
	int m, f = !info->pvo;
	char buf[20];
#if !defined(LWS_WITHOUT_CLIENT) && defined(LWS_HAVE_GETENV)
	char *p;
#endif
	int n;

	if (!vh)
		return NULL;

#if LWS_MAX_SMP > 1
	pthread_mutex_init(&vh->lock, NULL);
#endif

	if (!pcols)
		pcols = &protocols_dummy[0];

	vh->context = context;
	if (!info->vhost_name)
		vh->name = "default";
	else
		vh->name = info->vhost_name;

#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
	vh->http.error_document_404 = info->error_document_404;
#endif

	if (info->options & LWS_SERVER_OPTION_ONLY_RAW)
		lwsl_info("%s set to only support RAW\n", vh->name);

	vh->iface = info->iface;
#if !defined(LWS_WITH_ESP32) && \
    !defined(OPTEE_TA) && !defined(WIN32)
	vh->bind_iface = info->bind_iface;
#endif

	for (vh->count_protocols = 0;
	     pcols[vh->count_protocols].callback;
	     vh->count_protocols++)
		;

	vh->options = info->options;
	vh->pvo = info->pvo;
	vh->headers = info->headers;
	vh->user = info->user;
	vh->finalize = info->finalize;
	vh->finalize_arg = info->finalize_arg;

	LWS_FOR_EVERY_AVAILABLE_ROLE_START(ar)
		if (ar->init_vhost)
			if (ar->init_vhost(vh, info))
				return NULL;
	LWS_FOR_EVERY_AVAILABLE_ROLE_END;


	if (info->keepalive_timeout)
		vh->keepalive_timeout = info->keepalive_timeout;
	else
		vh->keepalive_timeout = 5;

	if (info->timeout_secs_ah_idle)
		vh->timeout_secs_ah_idle = info->timeout_secs_ah_idle;
	else
		vh->timeout_secs_ah_idle = 10;

#if defined(LWS_WITH_TLS)

	vh->tls.alpn = info->alpn;
	vh->tls.ssl_info_event_mask = info->ssl_info_event_mask;

	if (info->ecdh_curve)
		lws_strncpy(vh->tls.ecdh_curve, info->ecdh_curve,
			    sizeof(vh->tls.ecdh_curve));

	/* carefully allocate and take a copy of cert + key paths if present */
	n = 0;
	if (info->ssl_cert_filepath)
		n += (int)strlen(info->ssl_cert_filepath) + 1;
	if (info->ssl_private_key_filepath)
		n += (int)strlen(info->ssl_private_key_filepath) + 1;

	if (n) {
		vh->tls.key_path = vh->tls.alloc_cert_path =
					lws_malloc(n, "vh paths");
		if (info->ssl_cert_filepath) {
			n = (int)strlen(info->ssl_cert_filepath) + 1;
			memcpy(vh->tls.alloc_cert_path,
			       info->ssl_cert_filepath, n);
			vh->tls.key_path += n;
		}
		if (info->ssl_private_key_filepath)
			memcpy(vh->tls.key_path, info->ssl_private_key_filepath,
			       strlen(info->ssl_private_key_filepath) + 1);
	}
#endif

	/*
	 * give the vhost a unified list of protocols including the
	 * ones that came from plugins
	 */
	lwsp = lws_zalloc(sizeof(struct lws_protocols) * (vh->count_protocols +
				   context->plugin_protocol_count + 1),
			  "vhost-specific plugin table");
	if (!lwsp) {
		lwsl_err("OOM\n");
		return NULL;
	}

	m = vh->count_protocols;
	memcpy(lwsp, pcols, sizeof(struct lws_protocols) * m);

	/* for compatibility, all protocols enabled on vhost if only
	 * the default vhost exists.  Otherwise only vhosts who ask
	 * for a protocol get it enabled.
	 */

	if (context->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
		f = 0;
	(void)f;
#ifdef LWS_WITH_PLUGINS
	if (plugin) {

		while (plugin) {
			for (n = 0; n < plugin->caps.count_protocols; n++) {
				/*
				 * for compatibility's sake, no pvo implies
				 * allow all protocols
				 */
				if (f || lws_vhost_protocol_options(vh,
				    plugin->caps.protocols[n].name)) {
					memcpy(&lwsp[m],
					       &plugin->caps.protocols[n],
					       sizeof(struct lws_protocols));
					m++;
					vh->count_protocols++;
				}
			}
			plugin = plugin->list;
		}
	}
#endif

	if (
#ifdef LWS_WITH_PLUGINS
	    (context->plugin_list) ||
#endif
	    context->options & LWS_SERVER_OPTION_EXPLICIT_VHOSTS)
		vh->protocols = lwsp;
	else {
		vh->protocols = pcols;
		lws_free(lwsp);
	}

	vh->same_vh_protocol_heads = (struct lws_dll_lws *)
			lws_zalloc(sizeof(struct lws_dll_lws) *
				   vh->count_protocols, "same vh list");
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
	vh->http.mount_list = info->mounts;
#endif

#ifdef LWS_WITH_UNIX_SOCK
	if (LWS_UNIX_SOCK_ENABLED(vh)) {
		lwsl_notice("Creating Vhost '%s' path \"%s\", %d protocols\n",
				vh->name, vh->iface, vh->count_protocols);
	} else
#endif
	{
		switch(info->port) {
		case CONTEXT_PORT_NO_LISTEN:
			strcpy(buf, "(serving disabled)");
			break;
		case CONTEXT_PORT_NO_LISTEN_SERVER:
			strcpy(buf, "(no listener)");
			break;
		default:
			lws_snprintf(buf, sizeof(buf), "port %u", info->port);
			break;
		}
		lwsl_notice("Creating Vhost '%s' %s, %d protocols, IPv6 %s\n",
			    vh->name, buf, vh->count_protocols,
			    LWS_IPV6_ENABLED(vh) ? "on" : "off");
	}
	mounts = info->mounts;
	while (mounts) {
		(void)mount_protocols[0];
		lwsl_info("   mounting %s%s to %s\n",
			  mount_protocols[mounts->origin_protocol],
			  mounts->origin, mounts->mountpoint);

		/* convert interpreter protocol names to pointers */
		pvo = mounts->interpret;
		while (pvo) {
			for (n = 0; n < vh->count_protocols; n++) {
				if (strcmp(pvo->value, vh->protocols[n].name))
					continue;
				((struct lws_protocol_vhost_options *)pvo)->
					value = (const char *)(lws_intptr_t)n;
				break;
			}
			if (n == vh->count_protocols)
				lwsl_err("ignoring unknown interp pr %s\n",
					 pvo->value);
			pvo = pvo->next;
		}

		mounts = mounts->mount_next;
	}

	vh->listen_port = info->port;
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
	vh->http.http_proxy_port = 0;
	vh->http.http_proxy_address[0] = '\0';
#endif
#if defined(LWS_WITH_SOCKS5)
	vh->socks_proxy_port = 0;
	vh->socks_proxy_address[0] = '\0';
#endif

#if !defined(LWS_WITHOUT_CLIENT)
	/* either use proxy from info, or try get it from env var */
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
	/* http proxy */
	if (info->http_proxy_address) {
		/* override for backwards compatibility */
		if (info->http_proxy_port)
			vh->http.http_proxy_port = info->http_proxy_port;
		lws_set_proxy(vh, info->http_proxy_address);
	} else
#endif
	{
#ifdef LWS_HAVE_GETENV
		p = getenv("http_proxy");
		if (p)
			lws_set_proxy(vh, p);
#endif
	}
#endif
#if defined(LWS_WITH_SOCKS5)
	/* socks proxy */
	if (info->socks_proxy_address) {
		/* override for backwards compatibility */
		if (info->socks_proxy_port)
			vh->socks_proxy_port = info->socks_proxy_port;
		lws_set_socks(vh, info->socks_proxy_address);
	} else {
#ifdef LWS_HAVE_GETENV
		p = getenv("socks_proxy");
		if (p)
			lws_set_socks(vh, p);
#endif
	}
#endif

	vh->ka_time = info->ka_time;
	vh->ka_interval = info->ka_interval;
	vh->ka_probes = info->ka_probes;

	if (vh->options & LWS_SERVER_OPTION_STS)
		lwsl_notice("   STS enabled\n");

#ifdef LWS_WITH_ACCESS_LOG
	if (info->log_filepath) {
		vh->log_fd = lws_open(info->log_filepath,
				  O_CREAT | O_APPEND | O_RDWR, 0600);
		if (vh->log_fd == (int)LWS_INVALID_FILE) {
			lwsl_err("unable to open log filepath %s\n",
				 info->log_filepath);
			goto bail;
		}
#ifndef WIN32
		if (context->uid != -1)
			if (chown(info->log_filepath, context->uid,
				  context->gid) == -1)
				lwsl_err("unable to chown log file %s\n",
						info->log_filepath);
#endif
	} else
		vh->log_fd = (int)LWS_INVALID_FILE;
#endif
	if (lws_context_init_server_ssl(info, vh)) {
		lwsl_err("%s: lws_context_init_server_ssl failed\n", __func__);
		goto bail1;
	}
	if (lws_context_init_client_ssl(info, vh)) {
		lwsl_err("%s: lws_context_init_client_ssl failed\n", __func__);
		goto bail1;
	}
	lws_context_lock(context, "create_vhost");
	n = _lws_vhost_init_server(info, vh);
	lws_context_unlock(context);
	if (n < 0) {
		lwsl_err("init server failed\n");
		goto bail1;
	}

	while (1) {
		if (!(*vh1)) {
			*vh1 = vh;
			break;
		}
		vh1 = &(*vh1)->vhost_next;
	};

	/* for the case we are adding a vhost much later, after server init */

	if (context->protocol_init_done)
		if (lws_protocol_init(context)) {
			lwsl_err("%s: lws_protocol_init failed\n", __func__);
			goto bail1;
		}

	return vh;

bail1:
	lws_vhost_destroy(vh);

	return NULL;

#ifdef LWS_WITH_ACCESS_LOG
bail:
	lws_free(vh);
#endif

	return NULL;
}

LWS_VISIBLE int
lws_init_vhost_client_ssl(const struct lws_context_creation_info *info,
			  struct lws_vhost *vhost)
{
	struct lws_context_creation_info i;

	memcpy(&i, info, sizeof(i));
	i.port = CONTEXT_PORT_NO_LISTEN;

	return lws_context_init_client_ssl(&i, vhost);
}

LWS_VISIBLE void
lws_cancel_service_pt(struct lws *wsi)
{
	lws_plat_pipe_signal(wsi);
}

LWS_VISIBLE void
lws_cancel_service(struct lws_context *context)
{
	struct lws_context_per_thread *pt = &context->pt[0];
	short m = context->count_threads;

	if (context->being_destroyed1)
		return;

	lwsl_info("%s\n", __func__);

	while (m--) {
		if (pt->pipe_wsi)
			lws_plat_pipe_signal(pt->pipe_wsi);
		pt++;
	}
}

int
lws_create_event_pipes(struct lws_context *context)
{
	struct lws *wsi;
	int n;

	/*
	 * Create the pt event pipes... these are unique in that they are
	 * not bound to a vhost or protocol (both are NULL)
	 */

	for (n = 0; n < context->count_threads; n++) {
		if (context->pt[n].pipe_wsi)
			continue;

		wsi = lws_zalloc(sizeof(*wsi), "event pipe wsi");
		if (!wsi) {
			lwsl_err("%s: Out of mem\n", __func__);
			return 1;
		}
		wsi->context = context;
		lws_role_transition(wsi, 0, LRS_UNCONNECTED, &role_ops_pipe);
		wsi->protocol = NULL;
		wsi->tsi = n;
		wsi->vhost = NULL;
		wsi->event_pipe = 1;
		wsi->desc.sockfd = LWS_SOCK_INVALID;
		context->pt[n].pipe_wsi = wsi;
		context->count_wsi_allocated++;

		if (lws_plat_pipe_create(wsi))
			/*
			 * platform code returns 0 if it actually created pipes
			 * and initialized pt->dummy_pipe_fds[].  If it used
			 * some other mechanism outside of signaling in the
			 * normal event loop, we skip treating the pipe as
			 * related to dummy_pipe_fds[], adding it to the fds,
			 * etc.
			 */
			continue;

		wsi->desc.sockfd = context->pt[n].dummy_pipe_fds[0];
		lwsl_debug("event pipe fd %d\n", wsi->desc.sockfd);

		if (context->event_loop_ops->accept)
			if (context->event_loop_ops->accept(wsi))
				return 1;

		if (__insert_wsi_socket_into_fds(context, wsi))
			return 1;
	}

	return 0;
}

void
lws_destroy_event_pipe(struct lws *wsi)
{
	lwsl_info("%s\n", __func__);
	__remove_wsi_socket_from_fds(wsi);

	if (wsi->context->event_loop_ops->wsi_logical_close) {
		wsi->context->event_loop_ops->wsi_logical_close(wsi);
		lws_plat_pipe_close(wsi);
		wsi->context->count_wsi_allocated--;
		return;
	}

	if (wsi->context->event_loop_ops->destroy_wsi)
		wsi->context->event_loop_ops->destroy_wsi(wsi);
	lws_plat_pipe_close(wsi);
	wsi->context->count_wsi_allocated--;
	lws_free(wsi);
}

LWS_VISIBLE struct lws_context *
lws_create_context(const struct lws_context_creation_info *info)
{
	struct lws_context *context = NULL;
	struct lws_plat_file_ops *prev;
#ifndef LWS_NO_DAEMONIZE
	int pid_daemon = get_daemonize_pid();
#endif
	int n;
#if defined(__ANDROID__)
	struct rlimit rt;
#endif

	lwsl_info("Initial logging level %d\n", log_level);
	lwsl_info("Libwebsockets version: %s\n", library_version);

#ifdef LWS_WITH_IPV6
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_DISABLE_IPV6))
		lwsl_info("IPV6 compiled in and enabled\n");
	else
		lwsl_info("IPV6 compiled in but disabled\n");
#else
	lwsl_info("IPV6 not compiled in\n");
#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(" sizeof (*info)        : %ld\n", (long)sizeof(*info));
#if defined(LWS_WITH_STATS)
	lwsl_info(" LWS_WITH_STATS        : on\n");
#endif
	lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
#if defined(LWS_WITH_HTTP2)
	lwsl_info(" HTTP2 support         : available\n");
#else
	lwsl_info(" HTTP2 support         : not configured\n");
#endif
	if (lws_plat_context_early_init())
		return NULL;

	context = lws_zalloc(sizeof(struct lws_context), "context");
	if (!context) {
		lwsl_err("No memory for websocket context\n");
		return NULL;
	}

#if defined(LWS_WITH_TLS)
#if defined(LWS_WITH_MBEDTLS)
	context->tls_ops = &tls_ops_mbedtls;
#else
	context->tls_ops = &tls_ops_openssl;
#endif
#endif

	if (info->pt_serv_buf_size)
		context->pt_serv_buf_size = info->pt_serv_buf_size;
	else
		context->pt_serv_buf_size = 4096;

#if defined(LWS_ROLE_H2)
	role_ops_h2.init_context(context, info);
#endif

#if LWS_MAX_SMP > 1
	lws_mutex_refcount_init(&context->mr);
#endif

#if defined(LWS_WITH_ESP32)
	context->last_free_heap = esp_get_free_heap_size();
#endif

	/* default to just the platform fops implementation */

	context->fops_platform.LWS_FOP_OPEN	= _lws_plat_file_open;
	context->fops_platform.LWS_FOP_CLOSE	= _lws_plat_file_close;
	context->fops_platform.LWS_FOP_SEEK_CUR	= _lws_plat_file_seek_cur;
	context->fops_platform.LWS_FOP_READ	= _lws_plat_file_read;
	context->fops_platform.LWS_FOP_WRITE	= _lws_plat_file_write;
	context->fops_platform.fi[0].sig	= NULL;

	/*
	 *  arrange a linear linked-list of fops starting from context->fops
	 *
	 * platform fops
	 * [ -> fops_zip (copied into context so .next settable) ]
	 * [ -> info->fops ]
	 */

	context->fops = &context->fops_platform;
	prev = (struct lws_plat_file_ops *)context->fops;

#if defined(LWS_WITH_ZIP_FOPS)
	/* make a soft copy so we can set .next */
	context->fops_zip = fops_zip;
	prev->next = &context->fops_zip;
	prev = (struct lws_plat_file_ops *)prev->next;
#endif

	/* if user provided fops, tack them on the end of the list */
	if (info->fops)
		prev->next = info->fops;

	context->reject_service_keywords = info->reject_service_keywords;
	if (info->external_baggage_free_on_destroy)
		context->external_baggage_free_on_destroy =
			info->external_baggage_free_on_destroy;

	context->time_up = time(NULL);
	context->pcontext_finalize = info->pcontext;

	context->simultaneous_ssl_restriction =
			info->simultaneous_ssl_restriction;

#ifndef LWS_NO_DAEMONIZE
	if (pid_daemon) {
		context->started_with_parent = pid_daemon;
		lwsl_info(" 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;

	/*
	 * set the context event loops ops struct
	 *
	 * after this, all event_loop actions use the generic ops
	 */

#if defined(LWS_WITH_POLL)
	context->event_loop_ops = &event_loop_ops_poll;
#endif

	if (lws_check_opt(context->options, LWS_SERVER_OPTION_LIBUV))
#if defined(LWS_WITH_LIBUV)
		context->event_loop_ops = &event_loop_ops_uv;
#else
		goto fail_event_libs;
#endif

	if (lws_check_opt(context->options, LWS_SERVER_OPTION_LIBEV))
#if defined(LWS_WITH_LIBEV)
		context->event_loop_ops = &event_loop_ops_ev;
#else
		goto fail_event_libs;
#endif

	if (lws_check_opt(context->options, LWS_SERVER_OPTION_LIBEVENT))
#if defined(LWS_WITH_LIBEVENT)
		context->event_loop_ops = &event_loop_ops_event;
#else
		goto fail_event_libs;
#endif

	if (!context->event_loop_ops)
		goto fail_event_libs;

	lwsl_info("Using event loop: %s\n", context->event_loop_ops->name);

#if defined(LWS_WITH_TLS)
	time(&context->tls.last_cert_check_s);