server.c

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2016 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"

#if defined (LWS_WITH_ESP8266)
#undef memcpy
void *memcpy(void *dest, const void *src, size_t n)
{
	return ets_memcpy(dest, src, n);
}
#endif

int
lws_context_init_server(struct lws_context_creation_info *info,
			struct lws_vhost *vhost)
{
#if LWS_POSIX
	int n, opt = 1, limit = 1;
#endif
	lws_sockfd_type sockfd;
	struct lws_vhost *vh;
	struct lws *wsi;
	int m = 0;

	/* set up our external listening socket we serve on */

	if (info->port == CONTEXT_PORT_NO_LISTEN)
		return 0;

	vh = vhost->context->vhost_list;
	while (vh) {
		if (vh->listen_port == info->port) {
			if ((!info->iface && !vh->iface) ||
			    (info->iface && vh->iface &&
			    !strcmp(info->iface, vh->iface))) {
				vhost->listen_port = info->port;
				vhost->iface = info->iface;
				lwsl_notice(" using listen skt from vhost %s\n",
					    vh->name);
				return 0;
			}
		}
		vh = vh->vhost_next;
	}

#if LWS_POSIX
#if defined(__linux__)
	limit = vhost->context->count_threads;
#endif

	for (m = 0; m < limit; m++) {
#ifdef LWS_USE_UNIX_SOCK
	if (LWS_UNIX_SOCK_ENABLED(vhost))
		sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
	else
#endif
#ifdef LWS_USE_IPV6
	if (LWS_IPV6_ENABLED(vhost))
		sockfd = socket(AF_INET6, SOCK_STREAM, 0);
	else
#endif
		sockfd = socket(AF_INET, SOCK_STREAM, 0);

	if (sockfd == -1) {
#else
#if defined(LWS_WITH_ESP8266)
	sockfd = esp8266_create_tcp_listen_socket(vhost);
	if (!lws_sockfd_valid(sockfd)) {

#else
	sockfd = mbed3_create_tcp_stream_socket();
	if (!lws_sockfd_valid(sockfd)) {
#endif
#endif
		lwsl_err("ERROR opening socket\n");
		return 1;
	}

#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);
		return 1;
	}

#if defined(LWS_USE_IPV6) && defined(IPV6_V6ONLY)
	if (LWS_IPV6_ENABLED(vhost)) {
		if (vhost->options & LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY) {
			int value = (vhost->options & LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE) ? 1 : 0;
			if (setsockopt(sockfd, SOL_IPV6, IPV6_V6ONLY,
					(const void*)&value, sizeof(value)) < 0) {
				compatible_close(sockfd);
				return 1;
			}
		}
	}
#endif

#if defined(__linux__) && defined(SO_REUSEPORT) && LWS_MAX_SMP > 1
	if (vhost->context->count_threads > 1)
		if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT,
				(const void *)&opt, sizeof(opt)) < 0) {
			compatible_close(sockfd);
			return 1;
		}
#endif
#endif
	lws_plat_set_socket_options(vhost, sockfd);

#if LWS_POSIX
	n = lws_socket_bind(vhost, sockfd, info->port, info->iface);
	if (n < 0)
		goto bail;
	info->port = n;
#endif
	vhost->listen_port = info->port;
	vhost->iface = info->iface;

	wsi = lws_zalloc(sizeof(struct lws));
	if (wsi == NULL) {
		lwsl_err("Out of mem\n");
		goto bail;
	}
	wsi->context = vhost->context;
	wsi->sock = sockfd;
	wsi->mode = LWSCM_SERVER_LISTENER;
	wsi->protocol = vhost->protocols;
	wsi->tsi = m;
	wsi->vhost = vhost;
	wsi->listener = 1;

	vhost->context->pt[m].wsi_listening = wsi;
	if (insert_wsi_socket_into_fds(vhost->context, wsi))
		goto bail;

	vhost->context->count_wsi_allocated++;
	vhost->lserv_wsi = wsi;

#if LWS_POSIX
	listen(wsi->sock, LWS_SOMAXCONN);
	} /* for each thread able to independently listen */
#else
#if defined(LWS_WITH_ESP8266)
	esp8266_tcp_stream_bind(wsi->sock, info->port, wsi);
#else
	mbed3_tcp_stream_bind(wsi->sock, info->port, wsi);
#endif
#endif
	if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS)) {
#ifdef LWS_USE_UNIX_SOCK
		if (LWS_UNIX_SOCK_ENABLED(vhost))
			lwsl_notice(" Listening on \"%s\"\n", info->iface);
		else
#endif
			lwsl_notice(" Listening on port %d\n", info->port);
        }

	return 0;

bail:
	compatible_close(sockfd);

	return 1;
}

int
_lws_server_listen_accept_flow_control(struct lws *twsi, int on)
{
	struct lws_context_per_thread *pt = &twsi->context->pt[(int)twsi->tsi];
	struct lws *wsi = pt->wsi_listening;
	int n;

	if (!wsi || twsi->context->being_destroyed)
		return 0;

	lwsl_debug("%s: Thr %d: LISTEN wsi %p: state %d\n",
		   __func__, twsi->tsi, (void *)wsi, on);

	if (on)
		n = lws_change_pollfd(wsi, 0, LWS_POLLIN);
	else
		n = lws_change_pollfd(wsi, LWS_POLLIN, 0);

	return n;
}

#if defined(LWS_WITH_ESP8266)
#undef strchr
#define strchr ets_strchr
#endif

struct lws_vhost *
lws_select_vhost(struct lws_context *context, int port, const char *servername)
{
	struct lws_vhost *vhost = context->vhost_list;
	const char *p;
	int n, m, colon;

	n = strlen(servername);
	colon = n;
	p = strchr(servername, ':');
	if (p)
		colon = p - servername;

	/* first try exact matches */

	while (vhost) {
		if (port == vhost->listen_port &&
		    !strncmp(vhost->name, servername, colon)) {
			lwsl_info("SNI: Found: %s\n", servername);
			return vhost;
		}
		vhost = vhost->vhost_next;
	}

	/*
	 * if no exact matches, try matching *.vhost-name
	 * unintentional matches are possible but resolve to x.com for *.x.com
	 * which is reasonable.  If exact match exists we already chose it and
	 * never reach here.  SSL will still fail it if the cert doesn't allow
	 * *.x.com.
	 */

	vhost = context->vhost_list;
	while (vhost) {
		m = strlen(vhost->name);
		if (port == vhost->listen_port &&
		    m <= (colon - 2) &&
		    servername[colon - m - 1] == '.' &&
		    !strncmp(vhost->name, servername + colon - m, m)) {
			lwsl_info("SNI: Found %s on wildcard: %s\n",
				    servername, vhost->name);
			return vhost;
		}
		vhost = vhost->vhost_next;
	}

	return NULL;
}

LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
lws_vhost_name_to_protocol(struct lws_vhost *vh, const char *name)
{
	int n;

	for (n = 0; n < vh->count_protocols; n++)
		if (!strcmp(name, vh->protocols[n].name))
			return &vh->protocols[n];

	return NULL;
}

LWS_VISIBLE LWS_EXTERN const char *
lws_get_mimetype(const char *file, const struct lws_http_mount *m)
{
	int n = strlen(file);
	const struct lws_protocol_vhost_options *pvo = NULL;

	if (m)
		pvo = m->extra_mimetypes;

	if (n < 5)
		return NULL;

	if (!strcmp(&file[n - 4], ".ico"))
		return "image/x-icon";

	if (!strcmp(&file[n - 4], ".gif"))
		return "image/gif";

	if (!strcmp(&file[n - 3], ".js"))
		return "text/javascript";

	if (!strcmp(&file[n - 4], ".png"))
		return "image/png";

	if (!strcmp(&file[n - 4], ".jpg"))
		return "image/jpeg";

	if (!strcmp(&file[n - 3], ".gz"))
		return "application/gzip";

	if (!strcmp(&file[n - 4], ".JPG"))
		return "image/jpeg";

	if (!strcmp(&file[n - 5], ".html"))
		return "text/html";

	if (!strcmp(&file[n - 4], ".css"))
		return "text/css";

	if (!strcmp(&file[n - 4], ".txt"))
		return "text/plain";

	if (!strcmp(&file[n - 4], ".ttf"))
		return "application/x-font-ttf";

	if (!strcmp(&file[n - 5], ".woff"))
		return "application/font-woff";

	if (!strcmp(&file[n - 4], ".xml"))
		return "application/xml";

	while (pvo) {
		if (!strcmp(&file[n - strlen(pvo->name)], pvo->name))
			return pvo->value;

		pvo = pvo->next;
	}

	return NULL;
}

static int
lws_http_serve(struct lws *wsi, char *uri, const char *origin,
	       const struct lws_http_mount *m)
{
	const struct lws_protocol_vhost_options *pvo = m->interpret;
	struct lws_process_html_args args;
	const char *mimetype;
#if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266)
	struct stat st;
	int spin = 0;
#endif
	char path[256], sym[512];
	unsigned char *p = (unsigned char *)sym + 32 + LWS_PRE, *start = p;
	unsigned char *end = p + sizeof(sym) - 32 - LWS_PRE;
#if !defined(WIN32) && LWS_POSIX
	size_t len;
#endif
	int n;

	snprintf(path, sizeof(path) - 1, "%s/%s", origin, uri);

#if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266)
	do {
		spin++;

		if (stat(path, &st)) {
			lwsl_info("unable to stat %s\n", path);
			goto bail;
		}

		lwsl_debug(" %s mode %d\n", path, S_IFMT & st.st_mode);
#if !defined(WIN32) && LWS_POSIX
		if ((S_IFMT & st.st_mode) == S_IFLNK) {
			len = readlink(path, sym, sizeof(sym) - 1);
			if (len) {
				lwsl_err("Failed to read link %s\n", path);
				goto bail;
			}
			sym[len] = '\0';
			lwsl_debug("symlink %s -> %s\n", path, sym);
			snprintf(path, sizeof(path) - 1, "%s", sym);
		}
#endif
		if ((S_IFMT & st.st_mode) == S_IFDIR) {
			lwsl_debug("default filename append to dir\n");
			snprintf(path, sizeof(path) - 1, "%s/%s/index.html",
				 origin, uri);
		}

	} while ((S_IFMT & st.st_mode) != S_IFREG && spin < 5);

	if (spin == 5)
		lwsl_err("symlink loop %s \n", path);

	n = sprintf(sym, "%08lX%08lX", (unsigned long)st.st_size,
				   (unsigned long)st.st_mtime);

	if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_NONE_MATCH)) {
		/*
		 * he thinks he has some version of it already,
		 * check if the tag matches
		 */
		if (!strcmp(sym, lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_IF_NONE_MATCH))) {

			lwsl_debug("%s: ETAG match %s %s\n", __func__,
				   uri, origin);

			/* we don't need to send the payload */
			if (lws_add_http_header_status(wsi, 304, &p, end))
				return -1;
			if (lws_add_http_header_by_token(wsi,
					WSI_TOKEN_HTTP_ETAG,
					(unsigned char *)sym, n, &p, end))
				return -1;
			if (lws_finalize_http_header(wsi, &p, end))
				return -1;

			n = lws_write(wsi, start, p - start,
				      LWS_WRITE_HTTP_HEADERS);
			if (n != (p - start)) {
				lwsl_err("_write returned %d from %d\n", n, p - start);
				return -1;
			}

			return lws_http_transaction_completed(wsi);
		}
	}

	if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ETAG,
			(unsigned char *)sym, n, &p, end))
		return -1;
#endif

	mimetype = lws_get_mimetype(path, m);
	if (!mimetype) {
		lwsl_err("unknown mimetype for %s\n", path);
		goto bail;
	}

	wsi->sending_chunked = 0;

	/*
	 * check if this is in the list of file suffixes to be interpreted by
	 * a protocol
	 */
	while (pvo) {
		n = strlen(path);
		if (n > (int)strlen(pvo->name) &&
		    !strcmp(&path[n - strlen(pvo->name)], pvo->name)) {
			wsi->sending_chunked = 1;
			wsi->protocol_interpret_idx = (char)(long)pvo->value;
			lwsl_info("want %s interpreted by %s\n", path,
				    wsi->vhost->protocols[(int)(long)(pvo->value)].name);
			wsi->protocol = &wsi->vhost->protocols[(int)(long)(pvo->value)];
			if (lws_ensure_user_space(wsi))
				return -1;
			break;
		}
		pvo = pvo->next;
	}

	if (m->protocol) {
		const struct lws_protocols *pp = lws_vhost_name_to_protocol(
							wsi->vhost, m->protocol);

		if (lws_bind_protocol(wsi, pp))
			return 1;
		args.p = (char *)p;
		args.max_len = end - p;
		if (pp->callback(wsi, LWS_CALLBACK_ADD_HEADERS,
					  wsi->user_space, &args, 0))
			return -1;
		p = (unsigned char *)args.p;
	}

	n = lws_serve_http_file(wsi, path, mimetype, (char *)start, p - start);

	if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
		return -1; /* error or can't reuse connection: close the socket */

	return 0;
bail:

	return -1;
}

const struct lws_http_mount *
lws_find_mount(struct lws *wsi, const char *uri_ptr, int uri_len)
{
	const struct lws_http_mount *hm, *hit = NULL;
	int best = 0;

	hm = wsi->vhost->mount_list;
	while (hm) {
		if (uri_len >= hm->mountpoint_len &&
		    !strncmp(uri_ptr, hm->mountpoint, hm->mountpoint_len) &&
		    (uri_ptr[hm->mountpoint_len] == '\0' ||
		     uri_ptr[hm->mountpoint_len] == '/' ||
		     hm->mountpoint_len == 1)
		    ) {
			if (hm->origin_protocol == LWSMPRO_CALLBACK ||
			    ((hm->origin_protocol == LWSMPRO_CGI ||
			     lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI) ||
			     hm->protocol) &&
			    hm->mountpoint_len > best)) {
				best = hm->mountpoint_len;
				hit = hm;
			}
		}
		hm = hm->mount_next;
	}

	return hit;
}

int
lws_http_action(struct lws *wsi)
{
	struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
	enum http_connection_type connection_type;
	enum http_version request_version;
	char content_length_str[32];
	struct lws_process_html_args args;
	const struct lws_http_mount *hit = NULL;
	unsigned int n, count = 0;
	char http_version_str[10];
	char http_conn_str[20];
	int http_version_len;
	char *uri_ptr = NULL, *s;
	int uri_len = 0;
	int meth = -1;

	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,
#endif
	};
#if defined(_DEBUG) || defined(LWS_WITH_ACCESS_LOG)
	static const char * const method_names[] = {
		"GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE",
#ifdef LWS_USE_HTTP2
		":path",
#endif
	};
#endif
	static const char * const oprot[] = {
		"http://", "https://"
	};

	/* 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);
			meth = n;
			break;
		}

	(void)meth;

	/* we insist on absolute paths */

	if (uri_ptr[0] != '/') {
		lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL);

		goto bail_nuke_ah;
	}

	/* 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);
	}

	if (wsi->http2_substream) {
		wsi->u.http.request_version = HTTP_VERSION_2;
	} else {
		/* 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) {
		lwsl_info("LWS_CALLBACK_HTTP closing\n");

		return 1;
	}
	/*
	 * if there is content supposed to be coming,
	 * put a timeout on it having arrived
	 */
	lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
			wsi->context->timeout_secs);
#ifdef LWS_OPENSSL_SUPPORT
	if (wsi->redirect_to_https) {
		/*
		 * we accepted http:// only so we could redirect to
		 * https://, so issue the redirect.  Create the redirection
		 * URI from the host: header and ignore the path part
		 */
		unsigned char *start = pt->serv_buf + LWS_PRE, *p = start,
			      *end = p + 512;

		if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
			goto bail_nuke_ah;

		n = sprintf((char *)end, "https://%s/",
			    lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));

		n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
				      end, n, &p, end);
		if ((int)n < 0)
			goto bail_nuke_ah;

		return lws_http_transaction_completed(wsi);
	}
#endif

#ifdef LWS_WITH_ACCESS_LOG
	/*
	 * Produce Apache-compatible log string for wsi, like this:
	 *
	 * 2.31.234.19 - - [27/Mar/2016:03:22:44 +0800]
	 * "GET /aep-screen.png HTTP/1.1"
	 * 200 152987 "https://libwebsockets.org/index.html"
	 * "Mozilla/5.0 (Macint... Chrome/49.0.2623.87 Safari/537.36"
	 *
	 */
	{
		static const char * const hver[] = {
			"http/1.0", "http/1.1", "http/2"
		};
#ifdef LWS_USE_IPV6
		char ads[INET6_ADDRSTRLEN];
#else
		char ads[INET_ADDRSTRLEN];
#endif
		char da[64];
		const char *pa, *me;
		struct tm *tmp;
		time_t t = time(NULL);
		int l = 256;

		if (wsi->access_log_pending)
			lws_access_log(wsi);

		wsi->access_log.header_log = lws_malloc(l);
		if (wsi->access_log.header_log) {

			tmp = localtime(&t);
			if (tmp)
				strftime(da, sizeof(da), "%d/%b/%Y:%H:%M:%S %z", tmp);
			else
				strcpy(da, "01/Jan/1970:00:00:00 +0000");

			pa = lws_get_peer_simple(wsi, ads, sizeof(ads));
			if (!pa)
				pa = "(unknown)";

			if (meth >= 0)
				me = method_names[meth];
			else
				me = "unknown";

			snprintf(wsi->access_log.header_log, l,
				 "%s - - [%s] \"%s %s %s\"",
				 pa, da, me, uri_ptr,
				 hver[wsi->u.http.request_version]);

			l = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_USER_AGENT);
			if (l) {
				wsi->access_log.user_agent = lws_malloc(l + 2);
				if (wsi->access_log.user_agent)
					lws_hdr_copy(wsi, wsi->access_log.user_agent,
							l + 1, WSI_TOKEN_HTTP_USER_AGENT);
				else
					lwsl_err("OOM getting user agent\n");
			}
			wsi->access_log_pending = 1;
		}
	}
#endif

	/* can we serve it from the mount list? */

	hit = lws_find_mount(wsi, uri_ptr, uri_len);
	if (!hit) {
		/* deferred cleanup and reset to protocols[0] */

		lwsl_info("no hit\n");

		if (lws_bind_protocol(wsi, &wsi->vhost->protocols[0]))
			return 1;

		n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
				    wsi->user_space, uri_ptr, uri_len);

		goto after;
	}

	s = uri_ptr + hit->mountpoint_len;

	args.p = uri_ptr;
	args.len = uri_len;
	args.max_len = hit->auth_mask;
	args.final = 0; /* used to signal callback dealt with it */

	n = wsi->protocol->callback(wsi, LWS_CALLBACK_CHECK_ACCESS_RIGHTS,
				    wsi->user_space, &args, 0);
	if (n) {
		lws_return_http_status(wsi, HTTP_STATUS_UNAUTHORIZED,
				       NULL);
		goto bail_nuke_ah;
	}
	if (args.final) /* callback completely handled it well */
		return 0;

	/*
	 * if we have a mountpoint like https://xxx.com/yyy
	 * there is an implied / at the end for our purposes since
	 * we can only mount on a "directory".
	 *
	 * But if we just go with that, the browser cannot understand
	 * that he is actually looking down one "directory level", so
	 * even though we give him /yyy/abc.html he acts like the
	 * current directory level is /.  So relative urls like "x.png"
	 * wrongly look outside the mountpoint.
	 *
	 * Therefore if we didn't come in on a url with an explicit
	 * / at the end, we must redirect to add it so the browser
	 * understands he is one "directory level" down.
	 */
	if ((hit->mountpoint_len > 1 ||
	     (hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
	      hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) &&
	    (*s != '/' ||
	     (hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
	      hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) &&
	    (hit->origin_protocol != LWSMPRO_CGI &&
	     hit->origin_protocol != LWSMPRO_CALLBACK //&&
	     //hit->protocol == NULL
	     )) {
		unsigned char *start = pt->serv_buf + LWS_PRE,
			      *p = start, *end = p + 512;

		lwsl_debug("Doing 301 '%s' org %s\n", s, hit->origin);

		if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
			goto bail_nuke_ah;

		/* > at start indicates deal with by redirect */
		if (hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
		    hit->origin_protocol == LWSMPRO_REDIR_HTTPS)
			n = snprintf((char *)end, 256, "%s%s",
				    oprot[hit->origin_protocol & 1],
				    hit->origin);
		else
			n = snprintf((char *)end, 256,
			    "%s%s%s/", oprot[lws_is_ssl(wsi)],
			    lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST),
			    uri_ptr);

		n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
				      end, n, &p, end);
		if ((int)n < 0)
			goto bail_nuke_ah;

		return lws_http_transaction_completed(wsi);
	}

	/*
	 * A particular protocol callback is mounted here?
	 *
	 * For the duration of this http transaction, bind us to the
	 * associated protocol
	 */
	if (hit->origin_protocol == LWSMPRO_CALLBACK || hit->protocol) {
		const struct lws_protocols *pp;
		const char *name = hit->origin;
		if (hit->protocol)
			name = hit->protocol;

		pp = lws_vhost_name_to_protocol(wsi->vhost, name);
		if (!pp) {
			n = -1;
			lwsl_err("Unable to find plugin '%s'\n",
				 hit->origin);
			return 1;
		}

		if (lws_bind_protocol(wsi, pp))
			return 1;

		if (hit->cgienv && wsi->protocol->callback(wsi,
				LWS_CALLBACK_HTTP_PMO,
				wsi->user_space, (void *)hit->cgienv, 0))
			return 1;

		if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI)) {
			n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
					    wsi->user_space,
					    uri_ptr + hit->mountpoint_len,
					    uri_len - hit->mountpoint_len);
			goto after;
		}
	}

#ifdef LWS_WITH_CGI
	/* did we hit something with a cgi:// origin? */
	if (hit->origin_protocol == LWSMPRO_CGI) {
		const char *cmd[] = {
			NULL, /* replace with cgi path */
			NULL
		};
		unsigned char *p, *end, buffer[256];

		lwsl_debug("%s: cgi\n", __func__);
		cmd[0] = hit->origin;

		n = 5;
		if (hit->cgi_timeout)
			n = hit->cgi_timeout;

		n = lws_cgi(wsi, cmd, hit->mountpoint_len, n,
			    hit->cgienv);
		if (n) {
			lwsl_err("%s: cgi failed\n");
			return -1;
		}
		p = buffer + LWS_PRE;
		end = p + sizeof(buffer) - LWS_PRE;

		if (lws_add_http_header_status(wsi, 200, &p, end))
			return 1;
		if (lws_add_http_header_by_token(wsi, WSI_TOKEN_CONNECTION,
				(unsigned char *)"close", 5, &p, end))
			return 1;
		n = lws_write(wsi, buffer + LWS_PRE,
			      p - (buffer + LWS_PRE),
			      LWS_WRITE_HTTP_HEADERS);

		goto deal_body;
	}
#endif

	n = strlen(s);
	if (s[0] == '\0' || (n == 1 && s[n - 1] == '/'))
		s = (char *)hit->def;
	if (!s)
		s = "index.html";

	wsi->cache_secs = hit->cache_max_age;
	wsi->cache_reuse = hit->cache_reusable;
	wsi->cache_revalidate = hit->cache_revalidate;
	wsi->cache_intermediaries = hit->cache_intermediaries;

	n = lws_http_serve(wsi, s, hit->origin, hit);
	if (n) {
		/*
		 * 	lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL);
		 */
		if (hit->protocol) {
			const struct lws_protocols *pp = lws_vhost_name_to_protocol(
					wsi->vhost, hit->protocol);

			if (lws_bind_protocol(wsi, pp))
				return 1;

			n = pp->callback(wsi, LWS_CALLBACK_HTTP,
					 wsi->user_space,
					 uri_ptr + hit->mountpoint_len,
					 uri_len - hit->mountpoint_len);
		} else
			n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
				    wsi->user_space, uri_ptr, uri_len);
	}

after:
	if (n) {
		lwsl_info("LWS_CALLBACK_HTTP closing\n");

		return 1;
	}

#ifdef LWS_WITH_CGI
deal_body:
#endif
	/*
	 * 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 != LWSS_HTTP_ISSUING_FILE)
		/* Prepare to read body if we have a content length: */
		if (wsi->u.http.content_length > 0)
			wsi->state = LWSS_HTTP_BODY;

	return 0;

bail_nuke_ah:
	/* we're closing, losing some rx is OK */
	wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
	// lwsl_notice("%s: drop1\n", __func__);
	lws_header_table_detach(wsi, 1);

	return 1;
}

int
lws_bind_protocol(struct lws *wsi, const struct lws_protocols *p)
{
//	if (wsi->protocol == p)
//		return 0;

	if (wsi->protocol)
		wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP_DROP_PROTOCOL,
					wsi->user_space, NULL, 0);
	if (!wsi->user_space_externally_allocated)
		lws_free_set_NULL(wsi->user_space);

	wsi->protocol = p;
	if (!p)
		return 0;

	if (lws_ensure_user_space(wsi))
		return 1;

	if (wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP_BIND_PROTOCOL,
				    wsi->user_space, NULL, 0))
		return 1;

	return 0;
}


int
lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)