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  • /*
     * libwebsockets - small server side websockets and web server implementation
     *
    
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     * Copyright (C) 2010-2015 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 "private-libwebsockets.h"
    
    
    int lws_context_init_server(struct lws_context_creation_info *info,
    
    			    struct lws_context *context)
    
    {
    #ifdef LWS_USE_IPV6
    	struct sockaddr_in6 serv_addr6;
    #endif
    
    #if LWS_POSIX
    
    	socklen_t len = sizeof(struct sockaddr);
    	struct sockaddr_in sin;
    
    	int n, opt = 1;
    
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    #endif
    
    	lws_sockfd_type sockfd;
    
    
    	/* set up our external listening socket we serve on */
    
    	if (info->port == CONTEXT_PORT_NO_LISTEN)
    		return 0;
    
    
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    #if LWS_POSIX
    
    #ifdef LWS_USE_IPV6
    	if (LWS_IPV6_ENABLED(context))
    		sockfd = socket(AF_INET6, SOCK_STREAM, 0);
    	else
    #endif
    		sockfd = socket(AF_INET, SOCK_STREAM, 0);
    
    	if (sockfd == -1) {
    
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    #else
    	sockfd = mbed3_create_tcp_stream_socket();
    	if (!lws_sockfd_valid(sockfd)) {
    #endif
    
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    #if LWS_POSIX
    
    	/*
    	 * allow us to restart even if old sockets in TIME_WAIT
    	 */
    
    	if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
    
    		       (const void *)&opt, sizeof(opt)) < 0) {
    
    		compatible_close(sockfd);
    
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    #endif
    
    	lws_plat_set_socket_options(context, sockfd);
    
    
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    #if LWS_POSIX
    
    #ifdef LWS_USE_IPV6
    	if (LWS_IPV6_ENABLED(context)) {
    		v = (struct sockaddr *)&serv_addr6;
    		n = sizeof(struct sockaddr_in6);
    		bzero((char *) &serv_addr6, sizeof(serv_addr6));
    		serv_addr6.sin6_addr = in6addr_any;
    		serv_addr6.sin6_family = AF_INET6;
    		serv_addr6.sin6_port = htons(info->port);
    	} else
    #endif
    	{
    		v = (struct sockaddr *)&serv_addr4;
    		n = sizeof(serv_addr4);
    		bzero((char *) &serv_addr4, sizeof(serv_addr4));
    		serv_addr4.sin_addr.s_addr = INADDR_ANY;
    		serv_addr4.sin_family = AF_INET;
    
    		if (info->iface) {
    			if (interface_to_sa(context, info->iface,
    				   (struct sockaddr_in *)v, n) < 0) {
    				lwsl_err("Unable to find interface %s\n",
    							info->iface);
    				compatible_close(sockfd);
    				return 1;
    			}
    		}
    
    
    		serv_addr4.sin_port = htons(info->port);
    
    	} /* ipv4 */
    
    	n = bind(sockfd, v, n);
    	if (n < 0) {
    		lwsl_err("ERROR on binding to port %d (%d %d)\n",
    					      info->port, n, LWS_ERRNO);
    		compatible_close(sockfd);
    		return 1;
    	}
    
    	if (getsockname(sockfd, (struct sockaddr *)&sin, &len) == -1)
    		lwsl_warn("getsockname: %s\n", strerror(LWS_ERRNO));
    	else
    		info->port = ntohs(sin.sin_port);
    
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    #endif
    
    	wsi = lws_zalloc(sizeof(struct lws));
    
    	if (wsi == NULL) {
    		lwsl_err("Out of mem\n");
    		compatible_close(sockfd);
    		return 1;
    	}
    
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    	wsi->context = context;
    
    	wsi->sock = sockfd;
    	wsi->mode = LWS_CONNMODE_SERVER_LISTENER;
    
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    	wsi->protocol = context->protocols;
    
    	if (insert_wsi_socket_into_fds(context, wsi)) {
    		compatible_close(sockfd);
    		return 1;
    	}
    
    
    	context->listen_service_modulo = LWS_LISTEN_SERVICE_MODULO;
    	context->listen_service_count = 0;
    	context->listen_service_fd = sockfd;
    
    
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    #if LWS_POSIX
    
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    #else
    	mbed3_tcp_stream_bind(sockfd, info->port, wsi);
    #endif
    
    	lwsl_notice(" Listening on port %d\n", info->port);
    
    _lws_rx_flow_control(struct lws *wsi)
    
    {
    	/* there is no pending change */
    
    	if (!(wsi->rxflow_change_to & LWS_RXFLOW_PENDING_CHANGE))
    
    		return 0;
    
    	/* stuff is still buffered, not ready to really accept new input */
    
    	if (wsi->rxflow_buffer) {
    
    		/* get ourselves called back to deal with stashed buffer */
    
    		lws_callback_on_writable(wsi);
    
    		return 0;
    	}
    
    	/* pending is cleared, we can change rxflow state */
    
    
    	wsi->rxflow_change_to &= ~LWS_RXFLOW_PENDING_CHANGE;
    
    
    	lwsl_info("rxflow: wsi %p change_to %d\n", wsi,
    
    			      wsi->rxflow_change_to & LWS_RXFLOW_ALLOW);
    
    
    	/* adjust the pollfd for this wsi */
    
    
    	if (wsi->rxflow_change_to & LWS_RXFLOW_ALLOW) {
    
    		if (lws_change_pollfd(wsi, 0, LWS_POLLIN)) {
    			lwsl_info("%s: fail\n", __func__);
    
    			return -1;
    
    	} else
    		if (lws_change_pollfd(wsi, LWS_POLLIN, 0))
    			return -1;
    
    
    int lws_http_action(struct lws *wsi)
    
    	enum http_connection_type connection_type;
    
    	enum http_version request_version;
    
    	unsigned int n, count = 0;
    
    	char http_version_str[10];
    	char http_conn_str[20];
    
    	int http_version_len;
    	char *uri_ptr = NULL;
    	int uri_len = 0;
    
    
    	static const unsigned char methods[] = {
    		WSI_TOKEN_GET_URI,
    		WSI_TOKEN_POST_URI,
    		WSI_TOKEN_OPTIONS_URI,
    		WSI_TOKEN_PUT_URI,
    		WSI_TOKEN_PATCH_URI,
    		WSI_TOKEN_DELETE_URI,
    
    #ifdef LWS_USE_HTTP2
    
    		WSI_TOKEN_HTTP_COLON_PATH,
    
    #ifdef _DEBUG
    
    	static const char * const method_names[] = {
    		"GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE",
    #ifdef LWS_USE_HTTP2
    		":path",
    #endif
    	};
    
    #endif
    
    	/* it's not websocket.... shall we accept it as http? */
    
    	for (n = 0; n < ARRAY_SIZE(methods); n++)
    		if (lws_hdr_total_length(wsi, methods[n]))
    			count++;
    	if (!count) {
    
    		lwsl_warn("Missing URI in HTTP request\n");
    		goto bail_nuke_ah;
    	}
    
    
    	if (count != 1) {
    		lwsl_warn("multiple methods?\n");
    
    		goto bail_nuke_ah;
    	}
    
    
    	if (lws_ensure_user_space(wsi))
    
    		goto bail_nuke_ah;
    
    
    	for (n = 0; n < ARRAY_SIZE(methods); n++)
    		if (lws_hdr_total_length(wsi, methods[n])) {
    			uri_ptr = lws_hdr_simple_ptr(wsi, methods[n]);
    			uri_len = lws_hdr_total_length(wsi, methods[n]);
    			lwsl_info("Method: %s request for '%s'\n",
    				  	method_names[n], uri_ptr);
    			break;
    		}
    
    
    	/* HTTP header had a content length? */
    
    	wsi->u.http.content_length = 0;
    
    	if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI) ||
    		lws_hdr_total_length(wsi, WSI_TOKEN_PATCH_URI) ||
    		lws_hdr_total_length(wsi, WSI_TOKEN_PUT_URI))
    
    		wsi->u.http.content_length = 100 * 1024 * 1024;
    
    	if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) {
    		lws_hdr_copy(wsi, content_length_str,
    
    			     sizeof(content_length_str) - 1,
    			     WSI_TOKEN_HTTP_CONTENT_LENGTH);
    
    		wsi->u.http.content_length = atoi(content_length_str);
    	}
    
    	/* http_version? Default to 1.0, override with token: */
    	request_version = HTTP_VERSION_1_0;
    
    	/* Works for single digit HTTP versions. : */
    	http_version_len = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP);
    	if (http_version_len > 7) {
    		lws_hdr_copy(wsi, http_version_str,
    				sizeof(http_version_str) - 1, WSI_TOKEN_HTTP);
    		if (http_version_str[5] == '1' && http_version_str[7] == '1')
    			request_version = HTTP_VERSION_1_1;
    	}
    	wsi->u.http.request_version = request_version;
    
    	/* HTTP/1.1 defaults to "keep-alive", 1.0 to "close" */
    	if (request_version == HTTP_VERSION_1_1)
    		connection_type = HTTP_CONNECTION_KEEP_ALIVE;
    	else
    		connection_type = HTTP_CONNECTION_CLOSE;
    
    	/* Override default if http "Connection:" header: */
    	if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
    		lws_hdr_copy(wsi, http_conn_str, sizeof(http_conn_str) - 1,
    			     WSI_TOKEN_CONNECTION);
    		http_conn_str[sizeof(http_conn_str) - 1] = '\0';
    		if (!strcasecmp(http_conn_str, "keep-alive"))
    			connection_type = HTTP_CONNECTION_KEEP_ALIVE;
    		else
    
    			if (!strcasecmp(http_conn_str, "close"))
    
    				connection_type = HTTP_CONNECTION_CLOSE;
    	}
    	wsi->u.http.connection_type = connection_type;
    
    
    	n = wsi->protocol->callback(wsi, LWS_CALLBACK_FILTER_HTTP_CONNECTION,
    
    				    wsi->user_space, uri_ptr, uri_len);
    
    
    	if (!n) {
    		/*
    		 * if there is content supposed to be coming,
    		 * put a timeout on it having arrived
    		 */
    
    		lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
    
    				AWAITING_TIMEOUT);
    
    		n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
    					    wsi->user_space, uri_ptr, uri_len);
    
    	}
    
    	/* now drop the header info we kept a pointer to */
    
    
    	if (n) {
    		lwsl_info("LWS_CALLBACK_HTTP closing\n");
    		return 1; /* struct ah ptr already nuked */		}
    
    
    	 * If we're not issuing a file, check for content_length or
    	 * HTTP keep-alive. No keep-alive header allocation for
    
    	 * ISSUING_FILE, as this uses HTTP/1.0.
    	 *
    
    	 * In any case, return 0 and let lws_read decide how to
    
    	 * proceed based on state
    	 */
    	if (wsi->state != WSI_STATE_HTTP_ISSUING_FILE)
    		/* Prepare to read body if we have a content length: */
    		if (wsi->u.http.content_length > 0)
    			wsi->state = WSI_STATE_HTTP_BODY;
    
    	return 0;
    
    bail_nuke_ah:
    	/* drop the header info */
    
    int lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)
    
    	struct lws_context *context = lws_get_ctx(wsi);
    
    	struct allocated_headers *ah;
    
    	int protocol_len, n, hit;
    
    	char protocol_list[128];
    	char protocol_name[32];
    	char *p;
    
    		if (lws_parse(wsi, *(*buf)++)) {
    
    			lwsl_info("lws_parse failed\n");
    
    			goto bail_nuke_ah;
    		}
    
    		if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
    			continue;
    
    
    		lwsl_parser("lws_parse sees parsing complete\n");
    
    
    		wsi->mode = LWS_CONNMODE_PRE_WS_SERVING_ACCEPT;
    
    		lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
    
    
    		/* is this websocket protocol or normal http 1.0? */
    
    		if (!lws_hdr_total_length(wsi, WSI_TOKEN_UPGRADE) ||
    			     !lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
    
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    			lws_union_transition(wsi, LWS_CONNMODE_HTTP_SERVING_ACCEPTED);
    
    			wsi->state = WSI_STATE_HTTP;
    			wsi->u.http.fd = LWS_INVALID_FILE;
    
    			/* expose it at the same offset as u.hdr */
    			wsi->u.http.ah = ah;
    
    			n = lws_http_action(wsi);
    
    			return n;
    
    		if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
    
    				"websocket"))
    
    			goto upgrade_ws;
    
    #ifdef LWS_USE_HTTP2
    
    		if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
    
    			goto upgrade_h2c;
    
    		/* dunno what he wanted to upgrade to */
    		goto bail_nuke_ah;
    
    #ifdef LWS_USE_HTTP2
    upgrade_h2c:
    		if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
    			lwsl_err("missing http2_settings\n");
    
    			goto bail_nuke_ah;
    		}
    
    
    		lwsl_err("h2c upgrade...\n");
    
    		p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP2_SETTINGS);
    		/* convert the peer's HTTP-Settings */
    
    		n = lws_b64_decode_string(p, protocol_list,
    					  sizeof(protocol_list));
    
    		if (n < 0) {
    			lwsl_parser("HTTP2_SETTINGS too long\n");
    			return 1;
    		}
    
    		/* adopt the header info */
    
    		ah = wsi->u.hdr.ah;
    
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    		lws_union_transition(wsi, LWS_CONNMODE_HTTP2_SERVING);
    
    		/* http2 union member has http union struct at start */
    		wsi->u.http.ah = ah;
    
    		lws_http2_init(&wsi->u.http2.peer_settings);
    		lws_http2_init(&wsi->u.http2.my_settings);
    
    		/* HTTP2 union */
    
    		lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings,
    				(unsigned char *)protocol_list, n);
    
    
    		strcpy(protocol_list,
    		       "HTTP/1.1 101 Switching Protocols\x0d\x0a"
    		      "Connection: Upgrade\x0d\x0a"
    		      "Upgrade: h2c\x0d\x0a\x0d\x0a");
    
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    		n = lws_issue_raw(wsi, (unsigned char *)protocol_list,
    					strlen(protocol_list));
    		if (n != strlen(protocol_list)) {
    
    			lwsl_debug("http2 switch: ERROR writing to socket\n");
    			return 1;
    		}
    
    		wsi->state = WSI_STATE_HTTP2_AWAIT_CLIENT_PREFACE;
    
    upgrade_ws:
    
    			lwsl_err("NULL protocol at lws_read\n");
    
    		 * Select the first protocol we support from the list
    		 * the client sent us.
    		 *
    		 * Copy it to remove header fragmentation
    
    		if (lws_hdr_copy(wsi, protocol_list, sizeof(protocol_list) - 1,
    				 WSI_TOKEN_PROTOCOL) < 0) {
    			lwsl_err("protocol list too long");
    			goto bail_nuke_ah;
    		}
    
    		protocol_len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL);
    		protocol_list[protocol_len] = '\0';
    		p = protocol_list;
    		hit = 0;
    
    		while (*p && !hit) {
    
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    			unsigned int n = 0;
    
    			while (n < sizeof(protocol_name) - 1 && *p && *p !=',')
    				protocol_name[n++] = *p++;
    			protocol_name[n] = '\0';
    			if (*p)
    				p++;
    
    			lwsl_info("checking %s\n", protocol_name);
    
    			n = 0;
    
    			while (wsi->protocol && context->protocols[n].callback) {
    
    				if (!wsi->protocol->name) {
    					n++;
    
    					continue;
    
    				if (!strcmp(context->protocols[n].name,
    					    protocol_name)) {
    					lwsl_info("prot match %d\n", n);
    					wsi->protocol = &context->protocols[n];
    					hit = 1;
    
    		if (!hit) {
    
    			if (lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL) ==
    									 NULL) {
    
    				/*
    				 * some clients only have one protocol and
    				 * do not sent the protocol list header...
    				 * allow it and match to protocol 0
    				 */
    				lwsl_info("defaulting to prot 0 handler\n");
    
    				wsi->protocol = &context->protocols[0];
    			} else {
    
    				lwsl_err("No protocol from list \"%s\" supported\n",
    					 protocol_list);
    
    				goto bail_nuke_ah;
    			}
    		}
    
    		/* allocate wsi->user storage */
    
    		if (lws_ensure_user_space(wsi))
    
    			goto bail_nuke_ah;
    
    		/*
    		 * Give the user code a chance to study the request and
    		 * have the opportunity to deny it
    		 */
    
    
    		if ((wsi->protocol->callback)(wsi,
    
    				LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION,
    				wsi->user_space,
    			      lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL), 0)) {
    			lwsl_warn("User code denied connection\n");
    			goto bail_nuke_ah;
    		}
    
    
    		/*
    		 * Perform the handshake according to the protocol version the
    		 * client announced
    		 */
    
    		switch (wsi->ietf_spec_revision) {
    		case 13:
    			lwsl_parser("lws_parse calling handshake_04\n");
    			if (handshake_0405(context, wsi)) {
    				lwsl_info("hs0405 has failed the connection\n");
    				goto bail_nuke_ah;
    			}
    			break;
    
    		default:
    			lwsl_warn("Unknown client spec version %d\n",
    						       wsi->ietf_spec_revision);
    			goto bail_nuke_ah;
    		}
    
    		/* drop the header info -- no bail_nuke_ah after this */
    
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    		lws_union_transition(wsi, LWS_CONNMODE_WS_SERVING);
    
    
    		/*
    		 * create the frame buffer for this connection according to the
    		 * size mentioned in the protocol definition.  If 0 there, use
    		 * a big default for compatibility
    		 */
    
    		n = wsi->protocol->rx_buffer_size;
    		if (!n)
    			n = LWS_MAX_SOCKET_IO_BUF;
    		n += LWS_SEND_BUFFER_PRE_PADDING + LWS_SEND_BUFFER_POST_PADDING;
    
    		wsi->u.ws.rx_user_buffer = lws_malloc(n);
    
    		if (!wsi->u.ws.rx_user_buffer) {
    			lwsl_err("Out of Mem allocating rx buffer %d\n", n);
    			return 1;
    		}
    		lwsl_info("Allocating RX buffer %d\n", n);
    
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    #if LWS_POSIX
    
    		if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF,
    			       (const char *)&n, sizeof n)) {
    
    			lwsl_warn("Failed to set SNDBUF to %d", n);
    			return 1;
    		}
    
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    #endif
    
    		lwsl_parser("accepted v%02d connection\n",
    						       wsi->ietf_spec_revision);
    	} /* while all chars are handled */
    
    	return 0;
    
    bail_nuke_ah:
    	/* drop the header info */
    
    struct lws *
    lws_create_new_server_wsi(struct lws_context *context)
    
    	new_wsi = lws_zalloc(sizeof(struct lws));
    
    	if (new_wsi == NULL) {
    		lwsl_err("Out of memory for new connection\n");
    		return NULL;
    	}
    
    
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    	new_wsi->context = context;
    
    	new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
    
    	new_wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
    
    
    	/* intialize the instance struct */
    
    	new_wsi->state = WSI_STATE_HTTP;
    	new_wsi->mode = LWS_CONNMODE_HTTP_SERVING;
    
    	new_wsi->hdr_parsing_completed = 0;
    
    #ifdef LWS_OPENSSL_SUPPORT
    	new_wsi->use_ssl = LWS_SSL_ENABLED(context);
    #endif
    
    
    	if (lws_allocate_header_table(new_wsi)) {
    
    		lws_free(new_wsi);
    
    	}
    
    	/*
    	 * these can only be set once the protocol is known
    	 * we set an unestablished connection's protocol pointer
    	 * to the start of the supported list, so it can look
    	 * for matching ones during the handshake
    	 */
    	new_wsi->protocol = context->protocols;
    	new_wsi->user_space = NULL;
    	new_wsi->ietf_spec_revision = 0;
    
    	new_wsi->sock = LWS_SOCK_INVALID;
    
    	/*
    	 * outermost create notification for wsi
    	 * no user_space because no protocol selection
    	 */
    
    	context->protocols[0].callback(new_wsi, LWS_CALLBACK_WSI_CREATE, NULL,
    				       NULL, 0);
    
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    /**
     * lws_http_transaction_completed() - wait for new http transaction or close
     * @wsi:	websocket connection
     *
     *	Returns 1 if the HTTP connection must close now
     *	Returns 0 and resets connection to wait for new HTTP header /
     *	  transaction if possible
     */
    
    LWS_VISIBLE
    
    int lws_http_transaction_completed(struct lws *wsi)
    
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    {
    	/* if we can't go back to accept new headers, drop the connection */
    	if (wsi->u.http.connection_type != HTTP_CONNECTION_KEEP_ALIVE) {
    		lwsl_info("%s: close connection\n", __func__);
    		return 1;
    	}
    
    	/* otherwise set ourselves up ready to go again */
    	wsi->state = WSI_STATE_HTTP;
    
    	wsi->mode = LWS_CONNMODE_HTTP_SERVING;
    	wsi->u.http.content_length = 0;
    
    	/* He asked for it to stay alive indefinitely */
    
    	lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
    
    
    	if (lws_allocate_header_table(wsi))
    		return 1;
    
    	/* If we're (re)starting on headers, need other implied init */
    	wsi->u.hdr.ues = URIES_IDLE;
    
    	lwsl_info("%s: keep-alive await new transaction\n", __func__);
    
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    	return 0;
    }
    
    
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    LWS_VISIBLE
    
    int lws_server_socket_service(struct lws_context *context,
    
    			      struct lws *wsi, struct lws_pollfd *pollfd)
    
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    	lws_sockfd_type accept_fd = LWS_SOCK_INVALID;
    #if LWS_POSIX
    
    	struct sockaddr_in cli_addr;
    
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    #endif
    
    	struct lws *new_wsi = NULL;
    	int n, len;
    
    
    	switch (wsi->mode) {
    
    	case LWS_CONNMODE_HTTP_SERVING:
    
    	case LWS_CONNMODE_HTTP_SERVING_ACCEPTED:
    
    	case LWS_CONNMODE_HTTP2_SERVING:
    
    
    		/* handle http headers coming in */
    
    
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    		/* pending truncated sends have uber priority */
    
    
    		if (wsi->truncated_send_len) {
    
    			if (pollfd->revents & LWS_POLLOUT)
    
    				if (lws_issue_raw(wsi, wsi->truncated_send_malloc +
    
    						       wsi->truncated_send_offset,
    						  wsi->truncated_send_len) < 0) {
    
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    			/*
    			 * we can't afford to allow input processing send
    			 * something new, so spin around he event loop until
    			 * he doesn't have any partials
    			 */
    			break;
    		}
    
    
    		/* any incoming data ready? */
    
    
    		if (pollfd->revents & LWS_POLLIN) {
    
    			len = lws_ssl_capable_read(wsi, context->service_buffer,
    
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    						   sizeof(context->service_buffer));
    
    			lwsl_debug("%s: read %d\r\n", __func__, len);
    
    			switch (len) {
    			case 0:
    
    				lwsl_info("lws_server_skt_srv: read 0 len\n");
    				/* lwsl_info("   state=%d\n", wsi->state); */
    				if (!wsi->hdr_parsing_completed)
    
    				/* fallthru */
    			case LWS_SSL_CAPABLE_ERROR:
    
    			case LWS_SSL_CAPABLE_MORE_SERVICE:
    
    			/* just ignore incoming if waiting for close */
    			if (wsi->state != WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
    
    				/*
    				 * hm this may want to send
    				 * (via HTTP callback for example)
    				 */
    
    				n = lws_read(wsi, context->service_buffer, len);
    
    				if (n < 0) /* we closed wsi */
    					return 1;
    
    				/* hum he may have used up the
    				 * writability above */
    
    		/* this handles POLLOUT for http serving fragments */
    
    
    		if (!(pollfd->revents & LWS_POLLOUT))
    
    		if (lws_change_pollfd(wsi, LWS_POLLOUT, 0))
    			goto fail;
    
    		lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);
    
    		if (wsi->state != WSI_STATE_HTTP_ISSUING_FILE) {
    			n = user_callback_handle_rxflow(
    					wsi->protocol->callback,
    					wsi, LWS_CALLBACK_HTTP_WRITEABLE,
    
    					wsi->user_space, NULL, 0);
    
    			if (n < 0)
    
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    		/* >0 == completion, <0 == error */
    
    		n = lws_serve_http_file_fragment(wsi);
    
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    		if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi)))
    
    		break;
    
    	case LWS_CONNMODE_SERVER_LISTENER:
    
    
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    #if LWS_POSIX
    
    		/* pollin means a client has connected to us then */
    
    
    		if (!(pollfd->revents & LWS_POLLIN))
    
    			break;
    
    		/* listen socket got an unencrypted connection... */
    
    		clilen = sizeof(cli_addr);
    
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    		lws_latency_pre(context, wsi);
    
    		accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
    
    				    &clilen);
    
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    		lws_latency(context, wsi,
    			"unencrypted accept LWS_CONNMODE_SERVER_LISTENER",
    						     accept_fd, accept_fd >= 0);
    
    		if (accept_fd < 0) {
    
    			if (LWS_ERRNO == LWS_EAGAIN ||
    			    LWS_ERRNO == LWS_EWOULDBLOCK) {
    
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    				lwsl_debug("accept asks to try again\n");
    				break;
    			}
    
    			lwsl_warn("ERROR on accept: %s\n", strerror(LWS_ERRNO));
    
    		lws_plat_set_socket_options(context, accept_fd);
    
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    #else
    		/* not very beautiful... */
    		accept_fd = (lws_sockfd_type)pollfd;
    #endif
    
    		/*
    		 * look at who we connected to and give user code a chance
    		 * to reject based on client IP.  There's no protocol selected
    		 * yet so we issue this to protocols[0]
    		 */
    
    
    		if ((context->protocols[0].callback)(wsi,
    
    				LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
    
    			lwsl_debug("Callback denied network connection\n");
    			compatible_close(accept_fd);
    			break;
    		}
    
    
    		new_wsi = lws_create_new_server_wsi(context);
    
    		if (new_wsi == NULL) {
    			compatible_close(accept_fd);
    			break;
    		}
    
    		new_wsi->sock = accept_fd;
    
    
    		/* the transport is accepted... give him time to negotiate */
    
    		lws_set_timeout(new_wsi, PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
    				AWAITING_TIMEOUT);
    
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    #if LWS_POSIX == 0
    		mbed3_tcp_stream_accept(accept_fd, new_wsi);
    #endif
    
    		/*
    		 * A new connection was accepted. Give the user a chance to
    		 * set properties of the newly created wsi. There's no protocol
    		 * selected yet so we issue this to protocols[0]
    		 */
    
    		(context->protocols[0].callback)(new_wsi,
    
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    			LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED,
    			NULL, NULL, 0);
    
    		lws_libev_accept(new_wsi, accept_fd);
    
    		if (!LWS_SSL_ENABLED(context)) {
    
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    			lwsl_debug("accepted new conn  port %u on fd=%d\n",
    					  ntohs(cli_addr.sin_port), accept_fd);
    
    			if (insert_wsi_socket_into_fds(context, new_wsi))
    				goto fail;
    
    	if (!lws_server_socket_service_ssl(&wsi, new_wsi, accept_fd, pollfd))
    
    	lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
    
    	return 1;
    
     * lws_serve_http_file() - Send a file back to the client using http
    
     * @context:		libwebsockets context
     * @wsi:		Websocket instance (available from user callback)
     * @file:		The file to issue over http
     * @content_type:	The http content type, eg, text/html
     * @other_headers:	NULL or pointer to \0-terminated other header string
     *
     *	This function is intended to be called from the callback in response
     *	to http requests from the client.  It allows the callback to issue
     *	local files down the http link in a single step.
     *
     *	Returning <0 indicates error and the wsi should be closed.  Returning
    
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     *	>0 indicates the file was completely sent and
     *	lws_http_transaction_completed() called on the wsi (and close if != 0)
    
     *	==0 indicates the file transfer is started and needs more service later,
     *	the wsi should be left alone.
     */
    
    
    LWS_VISIBLE int lws_serve_http_file(struct lws *wsi, const char *file,
    
    				    const char *content_type,
    				    const char *other_headers,
    				    int other_headers_len)
    
    	struct lws_context *context = lws_get_ctx(wsi);
    
    	unsigned char *response = context->service_buffer +
    				  LWS_SEND_BUFFER_PRE_PADDING;
    
    	unsigned char *p = response;
    
    	unsigned char *end = p + sizeof(context->service_buffer) -
    
    			     LWS_SEND_BUFFER_PRE_PADDING;
    
    	wsi->u.http.fd = lws_plat_file_open(wsi, file, &wsi->u.http.filelen, O_RDONLY);
    
    	if (wsi->u.http.fd == LWS_INVALID_FILE) {
    
    		lwsl_err("Unable to open '%s'\n", file);
    
    		lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL);
    
    
    	if (lws_add_http_header_status(wsi, 200, &p, end))
    
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    		return -1;
    
    	if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_SERVER,
    
    					 (unsigned char *)"libwebsockets", 13,
    					 &p, end))
    
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    		return -1;
    
    	if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
    
    					 (unsigned char *)content_type,
    					 strlen(content_type), &p, end))
    
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    		return -1;
    
    	if (lws_add_http_header_content_length(wsi, wsi->u.http.filelen, &p, end))
    
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    		return -1;
    
    	if (other_headers) {
    
    		if ((end - p) < other_headers_len)
    			return -1;
    		memcpy(p, other_headers, other_headers_len);
    		p += other_headers_len;
    
    	if (lws_finalize_http_header(wsi, &p, end))
    
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    		return -1;
    
    	ret = lws_write(wsi, response, p - response, LWS_WRITE_HTTP_HEADERS);
    
    	if (ret != (p - response)) {
    		lwsl_err("_write returned %d from %d\n", ret, (p - response));
    
    		return -1;
    	}
    
    	wsi->u.http.filepos = 0;
    	wsi->state = WSI_STATE_HTTP_ISSUING_FILE;
    
    
    	return lws_serve_http_file_fragment(wsi);
    
    int lws_interpret_incoming_packet(struct lws *wsi, unsigned char *buf,
    				  size_t len)
    
    {
    	size_t n = 0;
    	int m;
    
    #if 0
    	lwsl_parser("received %d byte packet\n", (int)len);
    	lwsl_hexdump(buf, len);
    #endif
    
    	/* let the rx protocol state machine have as much as it needs */
    
    	while (n < len) {
    		/*
    		 * we were accepting input but now we stopped doing so
    		 */
    
    		if (!(wsi->rxflow_change_to & LWS_RXFLOW_ALLOW)) {
    			lws_rxflow_cache(wsi, buf, n, len);
    
    
    			return 1;
    		}
    
    		/* account for what we're using in rxflow buffer */
    
    		if (wsi->rxflow_buffer)
    			wsi->rxflow_pos++;
    
    
    		/* process the byte */
    
    		m = lws_rx_sm(wsi, buf[n++]);
    
    		if (m < 0)
    			return -1;
    	}
    
    	return 0;
    
    lws_server_get_canonical_hostname(struct lws_context *context,
    
    {
    	if (info->options & LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME)
    		return;
    
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    #if LWS_POSIX
    
    	/* find canonical hostname */
    	gethostname((char *)context->canonical_hostname,
    				       sizeof(context->canonical_hostname) - 1);