added libwebsockets source code

1 files changed, 1162 insertions, 0 deletions

diff --git a/src/engine/external/libwebsockets/server.c b/src/engine/external/libwebsockets/server.c
new file mode 100644
index 00000000..ed5c47b2
--- /dev/null
+++ b/src/engine/external/libwebsockets/server.c
@@ -0,0 +1,1162 @@
+/*
+ * libwebsockets - small server side websockets and web server implementation
+ *
+ * Copyright (C) 2010-2013 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 libwebsocket_context *context)
+{
+	int n;
+	int sockfd;
+	struct sockaddr_in sin;
+	socklen_t len = sizeof(sin);
+	int opt = 1;
+	struct libwebsocket *wsi;
+#ifdef LWS_USE_IPV6
+	struct sockaddr_in6 serv_addr6;
+#endif
+	struct sockaddr_in serv_addr4;
+	struct sockaddr *v;
+
+	/* set up our external listening socket we serve on */
+
+	if (info->port == CONTEXT_PORT_NO_LISTEN)
+		return 0;
+
+#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 < 0) {
+		lwsl_err("ERROR opening socket\n");
+		return 1;
+	}
+
+	/*
+	 * 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);
+		return 1;
+	}
+
+	lws_plat_set_socket_options(context, sockfd);
+
+#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);
+
+	context->listen_port = info->port;
+
+	wsi = lws_zalloc(sizeof(struct libwebsocket));
+	if (wsi == NULL) {
+		lwsl_err("Out of mem\n");
+		compatible_close(sockfd);
+		return 1;
+	}
+	wsi->sock = sockfd;
+	wsi->mode = LWS_CONNMODE_SERVER_LISTENER;
+
+	insert_wsi_socket_into_fds(context, wsi);
+
+	context->listen_service_modulo = LWS_LISTEN_SERVICE_MODULO;
+	context->listen_service_count = 0;
+	context->listen_service_fd = sockfd;
+
+	listen(sockfd, LWS_SOMAXCONN);
+	lwsl_notice(" Listening on port %d\n", info->port);
+
+	return 0;
+}
+
+int
+_libwebsocket_rx_flow_control(struct libwebsocket *wsi)
+{
+	struct libwebsocket_context *context = wsi->protocol->owning_server;
+
+	/* 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 */
+		libwebsocket_callback_on_writable(context, 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;
+
+	return 0;
+}
+
+int lws_http_action(struct libwebsocket_context *context,
+		    struct libwebsocket *wsi)
+{
+	char *uri_ptr = NULL;
+	int uri_len = 0;
+	enum http_version request_version;
+	enum http_connection_type connection_type;
+	int http_version_len;
+	char content_length_str[32];
+	char http_version_str[10];
+	char http_conn_str[20];
+	int n;
+
+	/* it's not websocket.... shall we accept it as http? */
+
+	if (!lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI) &&
+		!lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI) &&
+#ifdef LWS_USE_HTTP2
+		!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COLON_PATH) &&
+#endif
+		!lws_hdr_total_length(wsi, WSI_TOKEN_OPTIONS_URI)) {
+		lwsl_warn("Missing URI in HTTP request\n");
+		goto bail_nuke_ah;
+	}
+
+	if (lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI) &&
+		lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI)) {
+		lwsl_warn("GET and POST methods?\n");
+		goto bail_nuke_ah;
+	}
+
+	if (libwebsocket_ensure_user_space(wsi))
+		goto bail_nuke_ah;
+
+#ifdef LWS_USE_HTTP2
+	if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COLON_PATH)) {
+		uri_ptr = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_COLON_PATH);
+		uri_len = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COLON_PATH);
+		lwsl_info("HTTP2 request for '%s'\n", uri_ptr);
+		goto got_uri;
+	}
+#endif
+	if (lws_hdr_total_length(wsi, WSI_TOKEN_OPTIONS_URI)) {
+		uri_ptr = lws_hdr_simple_ptr(wsi, WSI_TOKEN_OPTIONS_URI);
+		uri_len = lws_hdr_total_length(wsi, WSI_TOKEN_OPTIONS_URI);
+		lwsl_info("HTTP OPTIONS request for '%s'\n", uri_ptr);
+		goto got_uri;
+	}
+	if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI)) {
+		uri_ptr = lws_hdr_simple_ptr(wsi, WSI_TOKEN_POST_URI);
+		uri_len = lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI);
+		lwsl_info("HTTP POST request for '%s'\n", uri_ptr);
+		goto got_uri;
+	}
+	if (lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI)) {
+		uri_ptr = lws_hdr_simple_ptr(wsi, WSI_TOKEN_GET_URI);
+		uri_len = lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI);
+		lwsl_info("HTTP GET request for '%s'\n", uri_ptr);
+	}
+
+got_uri:
+	/* HTTP header had a content length? */
+
+	wsi->u.http.content_length = 0;
+	if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_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 = 0;
+	if (wsi->protocol->callback)
+		n = wsi->protocol->callback(context, 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
+		 */
+		libwebsocket_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
+							      AWAITING_TIMEOUT);
+
+		if (wsi->protocol->callback)
+			n = wsi->protocol->callback(context, wsi,
+			    LWS_CALLBACK_HTTP,
+			    wsi->user_space, uri_ptr, uri_len);
+	}
+
+	/* now drop the header info we kept a pointer to */
+	lws_free2(wsi->u.http.ah);
+
+	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 libwebsocket_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 */
+	lws_free2(wsi->u.hdr.ah);
+
+	return 1;
+}
+
+
+int lws_handshake_server(struct libwebsocket_context *context,
+		struct libwebsocket *wsi, unsigned char **buf, size_t len)
+{
+	struct allocated_headers *ah;
+	int protocol_len;
+	char protocol_list[128];
+	char protocol_name[32];
+	char *p;
+	int n, hit;
+
+	/* LWS_CONNMODE_WS_SERVING */
+
+	while (len--) {
+		if (libwebsocket_parse(context, wsi, *(*buf)++)) {
+			lwsl_info("libwebsocket_parse failed\n");
+			goto bail_nuke_ah;
+		}
+
+		if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
+			continue;
+
+		lwsl_parser("libwebsocket_parse sees parsing complete\n");
+
+		wsi->mode = LWS_CONNMODE_PRE_WS_SERVING_ACCEPT;
+		libwebsocket_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)) {
+			
+			ah = wsi->u.hdr.ah;
+			
+			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(context, 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),
+								"h2c-14"))
+			goto upgrade_h2c;
+#endif
+		/* 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;
+
+		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");
+		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;
+		
+		return 0;
+#endif
+
+upgrade_ws:
+		if (!wsi->protocol)
+			lwsl_err("NULL protocol at libwebsocket_read\n");
+
+		/*
+		 * It's websocket
+		 *
+		 * 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) {
+			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;
+					break;
+				}
+
+				n++;
+			}
+		}
+
+		/* we didn't find a protocol he wanted? */
+
+		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 (libwebsocket_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->protocol->owning_server, 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 */
+		lws_free_header_table(wsi);
+
+		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);
+
+		if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF, (const char *)&n, sizeof n)) {
+			lwsl_warn("Failed to set SNDBUF to %d", n);
+			return 1;
+		}
+
+		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 */
+	lws_free_header_table(wsi);
+	return 1;
+}
+
+struct libwebsocket *
+libwebsocket_create_new_server_wsi(struct libwebsocket_context *context)
+{
+	struct libwebsocket *new_wsi;
+
+	new_wsi = lws_zalloc(sizeof(struct libwebsocket));
+	if (new_wsi == NULL) {
+		lwsl_err("Out of memory for new connection\n");
+		return NULL;
+	}
+
+	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;
+
+	if (lws_allocate_header_table(new_wsi)) {
+		lws_free(new_wsi);
+		return NULL;
+	}
+
+	/*
+	 * 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;
+
+	/*
+	 * outermost create notification for wsi
+	 * no user_space because no protocol selection
+	 */
+	context->protocols[0].callback(context, new_wsi,
+			LWS_CALLBACK_WSI_CREATE, NULL, NULL, 0);
+
+	return new_wsi;
+}
+
+/**
+ * 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 libwebsocket *wsi)
+{
+	/* 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;
+	
+	lwsl_info("%s: await new transaction\n", __func__);
+	
+	return 0;
+}
+
+int lws_server_socket_service(struct libwebsocket_context *context,
+			struct libwebsocket *wsi, struct libwebsocket_pollfd *pollfd)
+{
+	struct libwebsocket *new_wsi = NULL;
+	int accept_fd = 0;
+	socklen_t clilen;
+	struct sockaddr_in cli_addr;
+	int n;
+	int 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 */
+
+		/* 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) {
+					lwsl_info("closing from socket service\n");
+					return -1;
+				}
+			/*
+			 * 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(context, wsi,
+					context->service_buffer,
+						       sizeof(context->service_buffer));
+			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)
+					lws_free_header_table(wsi);
+				/* fallthru */
+			case LWS_SSL_CAPABLE_ERROR:
+				libwebsocket_close_and_free_session(
+						context, wsi,
+						LWS_CLOSE_STATUS_NOSTATUS);
+				return 0;
+			case LWS_SSL_CAPABLE_MORE_SERVICE:
+				goto try_pollout;
+			}
+
+			/* 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 = libwebsocket_read(context, wsi,
+							context->service_buffer, len);
+				if (n < 0)
+					/* we closed wsi */
+					return 0;
+
+				/* hum he may have used up the writability above */
+				break;
+			}
+		}
+
+try_pollout:
+		/* this handles POLLOUT for http serving fragments */
+
+		if (!(pollfd->revents & LWS_POLLOUT))
+			break;
+
+		/* one shot */
+		if (lws_change_pollfd(wsi, LWS_POLLOUT, 0))
+			goto fail;
+		
+		lws_libev_io(context, wsi, LWS_EV_STOP | LWS_EV_WRITE);
+
+		if (wsi->state != WSI_STATE_HTTP_ISSUING_FILE) {
+			n = user_callback_handle_rxflow(
+					wsi->protocol->callback,
+					wsi->protocol->owning_server,
+					wsi, LWS_CALLBACK_HTTP_WRITEABLE,
+					wsi->user_space,
+					NULL,
+					0);
+			if (n < 0)
+				goto fail;
+			break;
+		}
+
+		/* >0 == completion, <0 == error */
+		n = libwebsockets_serve_http_file_fragment(context, wsi);
+		if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi)))
+			goto fail;
+		break;
+
+	case LWS_CONNMODE_SERVER_LISTENER:
+
+		/* 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);
+		lws_latency_pre(context, wsi);
+		accept_fd  = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
+								       &clilen);
+		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) {
+				lwsl_debug("accept asks to try again\n");
+				break;
+			}
+			lwsl_warn("ERROR on accept: %s\n", strerror(LWS_ERRNO));
+			break;
+		}
+
+		lws_plat_set_socket_options(context, accept_fd);
+
+		/*
+		 * 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)(context, wsi,
+				LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
+					   NULL, (void *)(long)accept_fd, 0)) {
+			lwsl_debug("Callback denied network connection\n");
+			compatible_close(accept_fd);
+			break;
+		}
+
+		new_wsi = libwebsocket_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 */
+		libwebsocket_set_timeout(new_wsi,
+			PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
+							AWAITING_TIMEOUT);
+
+		/*
+		 * 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)(context, new_wsi,
+			LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED, NULL, NULL, 0);
+
+		lws_libev_accept(context, new_wsi, accept_fd);
+
+		if (!LWS_SSL_ENABLED(context)) {
+			lwsl_debug("accepted new conn  port %u on fd=%d\n",
+					  ntohs(cli_addr.sin_port), accept_fd);
+
+			insert_wsi_socket_into_fds(context, new_wsi);
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	if (lws_server_socket_service_ssl(context, &wsi, new_wsi,
+							  accept_fd, pollfd))
+		goto fail;
+
+	return 0;
+	
+fail:
+	libwebsocket_close_and_free_session(context, wsi,
+						 LWS_CLOSE_STATUS_NOSTATUS);
+	return 1;
+}
+
+#include "lextable-strings.h"
+
+const unsigned char *lws_token_to_string(enum lws_token_indexes token)
+{
+	if ((unsigned int)token >= ARRAY_SIZE(set))
+		return NULL;
+	
+	return (unsigned char *)set[token];
+}
+
+int lws_add_http_header_by_name(struct libwebsocket_context *context,
+			    struct libwebsocket *wsi,
+			    const unsigned char *name,
+			    const unsigned char *value,
+			    int length,
+			    unsigned char **p,
+			    unsigned char *end)
+{
+#ifdef LWS_USE_HTTP2
+	if (wsi->mode == LWS_CONNMODE_HTTP2_SERVING)
+		return lws_add_http2_header_by_name(context, wsi, name, value, length, p, end);
+#endif
+	if (name) {
+		while (*p < end && *name)
+			*((*p)++) = *name++;
+	
+		if (*p == end)
+			return 1;
+	
+		*((*p)++) = ' ';
+	}
+	if (*p + length + 3 >= end)
+		return 1;
+
+	memcpy(*p, value, length);
+	*p += length;
+	
+	*((*p)++) = '\x0d';
+	*((*p)++) = '\x0a';
+		
+	return 0;
+}
+
+int lws_finalize_http_header(struct libwebsocket_context *context,
+			    struct libwebsocket *wsi,
+			    unsigned char **p,
+			    unsigned char *end)
+{
+#ifdef LWS_USE_HTTP2
+	if (wsi->mode == LWS_CONNMODE_HTTP2_SERVING)
+		return 0;
+#endif
+	
+	if ((long)(end - *p) < 3)
+		return 1;
+	
+	*((*p)++) = '\x0d';
+	*((*p)++) = '\x0a';
+		
+	return 0;
+}
+
+int lws_add_http_header_by_token(struct libwebsocket_context *context,
+			    struct libwebsocket *wsi,
+			    enum lws_token_indexes token,
+			    const unsigned char *value,
+			    int length,
+			    unsigned char **p,
+			    unsigned char *end)
+{
+	const unsigned char *name;
+#ifdef LWS_USE_HTTP2
+	if (wsi->mode == LWS_CONNMODE_HTTP2_SERVING)
+		return lws_add_http2_header_by_token(context, wsi, token, value, length, p, end);
+#endif
+	name = lws_token_to_string(token);
+	if (!name)
+		return 1;
+	
+	return lws_add_http_header_by_name(context, wsi, name, value, length, p, end);
+}
+
+int lws_add_http_header_content_length(struct libwebsocket_context *context,
+			    struct libwebsocket *wsi,
+			    unsigned long content_length,
+			    unsigned char **p,
+			    unsigned char *end)
+{
+	char b[24];
+	int n;
+
+	n = sprintf(b, "%lu", content_length);
+	if (lws_add_http_header_by_token(context, wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH, (unsigned char *)b, n, p, end))
+		return 1;
+	wsi->u.http.content_length = content_length;
+	wsi->u.http.content_remain = content_length;
+
+	return 0;
+}
+
+static const char *err400[] = {
+	"Bad Request",
+	"Unauthorized",
+	"Payment Required",
+	"Forbidden",
+	"Not Found",
+	"Method Not Allowed",
+	"Not Acceptable",
+	"Proxy Auth Required",
+	"Request Timeout",
+	"Conflict",
+	"Gone",
+	"Length Required",
+	"Precondition Failed",
+	"Request Entity Too Large",
+	"Request URI too Long",
+	"Unsupported Media Type",
+	"Requested Range Not Satisfiable",
+	"Expectation Failed"
+};
+
+static const char *err500[] = {
+	"Internal Server Error",
+	"Not Implemented",
+	"Bad Gateway",
+	"Service Unavailable",
+	"Gateway Timeout",
+	"HTTP Version Not Supported"
+};
+
+int lws_add_http_header_status(struct libwebsocket_context *context,
+			    struct libwebsocket *wsi,
+			    unsigned int code,
+			    unsigned char **p,
+			    unsigned char *end)
+{
+	unsigned char code_and_desc[60];
+	const char *description = "";
+	int n;
+
+#ifdef LWS_USE_HTTP2
+	if (wsi->mode == LWS_CONNMODE_HTTP2_SERVING)
+		return lws_add_http2_header_status(context, wsi, code, p, end);
+#endif
+	if (code >= 400 && code < (400 + ARRAY_SIZE(err400)))
+		description = err400[code - 400];
+	if (code >= 500 && code < (500 + ARRAY_SIZE(err500)))
+		description = err500[code - 500];
+
+	n = sprintf((char *)code_and_desc, "HTTP/1.0 %u %s", code, description);
+	
+	return lws_add_http_header_by_name(context, wsi, NULL, code_and_desc, n, p, end);
+}
+
+/**
+ * libwebsockets_return_http_status() - Return simple http status
+ * @context:		libwebsockets context
+ * @wsi:		Websocket instance (available from user callback)
+ * @code:		Status index, eg, 404
+ * @html_body:		User-readable HTML description < 1KB, or NULL
+ *
+ *	Helper to report HTTP errors back to the client cleanly and
+ *	consistently
+ */
+LWS_VISIBLE int libwebsockets_return_http_status(
+		struct libwebsocket_context *context, struct libwebsocket *wsi,
+				       unsigned int code, const char *html_body)
+{
+	int n, m;
+
+	unsigned char *p = context->service_buffer + LWS_SEND_BUFFER_PRE_PADDING;
+	unsigned char *start = p;
+	unsigned char *end = p + sizeof(context->service_buffer) -
+					LWS_SEND_BUFFER_PRE_PADDING;
+
+	if (!html_body)
+		html_body = "";
+
+	if (lws_add_http_header_status(context, wsi, code, &p, end))
+		return 1;
+	if (lws_add_http_header_by_token(context, wsi, WSI_TOKEN_HTTP_SERVER, (unsigned char *)"libwebsockets", 13, &p, end))
+		return 1;
+	if (lws_add_http_header_by_token(context, wsi, WSI_TOKEN_HTTP_CONTENT_TYPE, (unsigned char *)"text/html", 9, &p, end))
+		return 1;
+	if (lws_finalize_http_header(context, wsi, &p, end))
+		return 1;
+
+	m = libwebsocket_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS);
+	if (m != (int)(p - start))
+		return 1;
+
+	n = sprintf((char *)start, "<html><body><h1>%u</h1>%s</body></html>", code, html_body);
+	m = libwebsocket_write(wsi, start, n, LWS_WRITE_HTTP);
+
+	return m != n;
+}
+
+/**
+ * libwebsockets_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
+ *	>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 libwebsockets_serve_http_file(
+		struct libwebsocket_context *context,
+			struct libwebsocket *wsi, const char *file,
+			   const char *content_type, const char *other_headers,
+			   int other_headers_len)
+{
+	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;
+	int ret = 0;
+
+	wsi->u.http.fd = lws_plat_open_file(file, &wsi->u.http.filelen);
+
+	if (wsi->u.http.fd == LWS_INVALID_FILE) {
+		lwsl_err("Unable to open '%s'\n", file);
+		libwebsockets_return_http_status(context, wsi,
+						HTTP_STATUS_NOT_FOUND, NULL);
+		return -1;
+	}
+
+	if (lws_add_http_header_status(context, wsi, 200, &p, end))
+		return -1;
+	if (lws_add_http_header_by_token(context, wsi, WSI_TOKEN_HTTP_SERVER, (unsigned char *)"libwebsockets", 13, &p, end))
+		return -1;
+	if (lws_add_http_header_by_token(context, wsi, WSI_TOKEN_HTTP_CONTENT_TYPE, (unsigned char *)content_type, strlen(content_type), &p, end))
+		return -1;
+	if (lws_add_http_header_content_length(context, wsi, wsi->u.http.filelen, &p, end))
+		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(context, wsi, &p, end))
+		return -1;
+	
+	ret = libwebsocket_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 libwebsockets_serve_http_file_fragment(context, wsi);
+}
+
+
+int libwebsocket_interpret_incoming_packet(struct libwebsocket *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 = libwebsocket_rx_sm(wsi, buf[n++]);
+		if (m < 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+LWS_VISIBLE void
+lws_server_get_canonical_hostname(struct libwebsocket_context *context,
+				struct lws_context_creation_info *info)
+{
+	if (info->options & LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME)
+		return;
+
+	/* find canonical hostname */
+	gethostname((char *)context->canonical_hostname,
+				       sizeof(context->canonical_hostname) - 1);
+
+	lwsl_notice(" canonical_hostname = %s\n", context->canonical_hostname);
+}