added libwebsockets source code

1 files changed, 850 insertions, 0 deletions

diff --git a/src/engine/external/libwebsockets/libwebsockets.c b/src/engine/external/libwebsockets/libwebsockets.c
new file mode 100644
index 00000000..b9be442f
--- /dev/null
+++ b/src/engine/external/libwebsockets/libwebsockets.c
@@ -0,0 +1,850 @@
+/*
+ * libwebsockets - small server side websockets and web server implementation
+ *
+ * Copyright (C) 2010-2014 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 log_level = LLL_ERR | LLL_WARN | LLL_NOTICE;
+static void (*lwsl_emit)(int level, const char *line) = lwsl_emit_stderr;
+
+static const char * const log_level_names[] = {
+	"ERR",
+	"WARN",
+	"NOTICE",
+	"INFO",
+	"DEBUG",
+	"PARSER",
+	"HEADER",
+	"EXTENSION",
+	"CLIENT",
+	"LATENCY",
+};
+
+
+void
+libwebsocket_close_and_free_session(struct libwebsocket_context *context,
+			 struct libwebsocket *wsi, enum lws_close_status reason)
+{
+	int n, m, ret;
+	int old_state;
+	unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 2 +
+						  LWS_SEND_BUFFER_POST_PADDING];
+	struct lws_tokens eff_buf;
+
+	if (!wsi)
+		return;
+
+	old_state = wsi->state;
+
+	if (wsi->socket_is_permanently_unusable)
+		goto just_kill_connection;
+
+	switch (old_state) {
+	case WSI_STATE_DEAD_SOCKET:
+		return;
+
+	/* we tried the polite way... */
+	case WSI_STATE_AWAITING_CLOSE_ACK:
+		goto just_kill_connection;
+
+	case WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE:
+		if (wsi->truncated_send_len) {
+			libwebsocket_callback_on_writable(context, wsi);
+			return;
+		}
+		lwsl_info("wsi %p completed WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE\n", wsi);
+		goto just_kill_connection;
+	default:
+		if (wsi->truncated_send_len) {
+			lwsl_info("wsi %p entering WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE\n", wsi);
+			wsi->state = WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE;
+			return;
+		}
+		break;
+	}
+
+	wsi->u.ws.close_reason = reason;
+
+	if (wsi->mode == LWS_CONNMODE_WS_CLIENT_WAITING_CONNECT ||
+			wsi->mode == LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE) {
+
+		context->protocols[0].callback(context, wsi,
+			LWS_CALLBACK_CLIENT_CONNECTION_ERROR, wsi->user_space, NULL, 0);
+
+		lws_free_header_table(wsi);
+		goto just_kill_connection;
+	}
+
+	if (wsi->mode == LWS_CONNMODE_HTTP_SERVING_ACCEPTED) {
+		if (wsi->u.http.fd != LWS_INVALID_FILE) {
+			lwsl_debug("closing http file\n");
+			compatible_file_close(wsi->u.http.fd);
+			wsi->u.http.fd = LWS_INVALID_FILE;
+			context->protocols[0].callback(context, wsi,
+				LWS_CALLBACK_CLOSED_HTTP, wsi->user_space, NULL, 0);
+		}
+	}
+
+	/*
+	 * are his extensions okay with him closing?  Eg he might be a mux
+	 * parent and just his ch1 aspect is closing?
+	 */
+	
+	if (lws_ext_callback_for_each_active(wsi,
+		      LWS_EXT_CALLBACK_CHECK_OK_TO_REALLY_CLOSE, NULL, 0) > 0) {
+		lwsl_ext("extension vetoed close\n");
+		return;
+	}
+
+	/*
+	 * flush any tx pending from extensions, since we may send close packet
+	 * if there are problems with send, just nuke the connection
+	 */
+
+	do {
+		ret = 0;
+		eff_buf.token = NULL;
+		eff_buf.token_len = 0;
+
+		/* show every extension the new incoming data */
+
+		m = lws_ext_callback_for_each_active(wsi,
+			  LWS_EXT_CALLBACK_FLUSH_PENDING_TX, &eff_buf, 0);
+		if (m < 0) {
+			lwsl_ext("Extension reports fatal error\n");
+			goto just_kill_connection;
+		}
+		if (m)
+			/*
+			 * at least one extension told us he has more
+			 * to spill, so we will go around again after
+			 */
+			ret = 1;
+
+		/* assuming they left us something to send, send it */
+
+		if (eff_buf.token_len)
+			if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
+				      eff_buf.token_len) != eff_buf.token_len) {
+				lwsl_debug("close: ext spill failed\n");
+				goto just_kill_connection;
+			}
+	} while (ret);
+
+	/*
+	 * signal we are closing, libwebsocket_write will
+	 * add any necessary version-specific stuff.  If the write fails,
+	 * no worries we are closing anyway.  If we didn't initiate this
+	 * close, then our state has been changed to
+	 * WSI_STATE_RETURNED_CLOSE_ALREADY and we will skip this.
+	 *
+	 * Likewise if it's a second call to close this connection after we
+	 * sent the close indication to the peer already, we are in state
+	 * WSI_STATE_AWAITING_CLOSE_ACK and will skip doing this a second time.
+	 */
+
+	if (old_state == WSI_STATE_ESTABLISHED &&
+					  reason != LWS_CLOSE_STATUS_NOSTATUS) {
+
+		lwsl_debug("sending close indication...\n");
+
+		/* make valgrind happy */
+		memset(buf, 0, sizeof(buf));
+		n = libwebsocket_write(wsi,
+				&buf[LWS_SEND_BUFFER_PRE_PADDING + 2],
+							    0, LWS_WRITE_CLOSE);
+		if (n >= 0) {
+			/*
+			 * we have sent a nice protocol level indication we
+			 * now wish to close, we should not send anything more
+			 */
+
+			wsi->state = WSI_STATE_AWAITING_CLOSE_ACK;
+
+			/*
+			 * ...and we should wait for a reply for a bit
+			 * out of politeness
+			 */
+
+			libwebsocket_set_timeout(wsi,
+						  PENDING_TIMEOUT_CLOSE_ACK, 1);
+
+			lwsl_debug("sent close indication, awaiting ack\n");
+
+			return;
+		}
+
+		lwsl_info("close: sending close packet failed, hanging up\n");
+
+		/* else, the send failed and we should just hang up */
+	}
+
+just_kill_connection:
+
+	lwsl_debug("close: just_kill_connection\n");
+
+	/*
+	 * we won't be servicing or receiving anything further from this guy
+	 * delete socket from the internal poll list if still present
+	 */
+
+	remove_wsi_socket_from_fds(context, wsi);
+
+	wsi->state = WSI_STATE_DEAD_SOCKET;
+
+	lws_free2(wsi->rxflow_buffer);
+
+	if (wsi->mode == LWS_CONNMODE_HTTP2_SERVING && wsi->u.hdr.ah) {
+		lws_free2(wsi->u.hdr.ah);
+	}
+
+	if ((old_state == WSI_STATE_ESTABLISHED ||
+	     wsi->mode == LWS_CONNMODE_WS_SERVING ||
+	     wsi->mode == LWS_CONNMODE_WS_CLIENT)) {
+
+		lws_free2(wsi->u.ws.rx_user_buffer);
+
+		if (wsi->truncated_send_malloc) {
+			/* not going to be completed... nuke it */
+			lws_free2(wsi->truncated_send_malloc);
+			wsi->truncated_send_len = 0;
+		}
+		if (wsi->u.ws.ping_payload_buf) {
+			lws_free2(wsi->u.ws.ping_payload_buf);
+			wsi->u.ws.ping_payload_alloc = 0;
+			wsi->u.ws.ping_payload_len = 0;
+		}
+	}
+
+	/* tell the user it's all over for this guy */
+
+	if (wsi->protocol && wsi->protocol->callback &&
+			((old_state == WSI_STATE_ESTABLISHED) ||
+			 (old_state == WSI_STATE_RETURNED_CLOSE_ALREADY) ||
+			 (old_state == WSI_STATE_AWAITING_CLOSE_ACK) ||
+			 (old_state == WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE))) {
+		lwsl_debug("calling back CLOSED\n");
+		wsi->protocol->callback(context, wsi, LWS_CALLBACK_CLOSED,
+						      wsi->user_space, NULL, 0);
+	} else if (wsi->mode == LWS_CONNMODE_HTTP_SERVING_ACCEPTED) {
+		lwsl_debug("calling back CLOSED_HTTP\n");
+		context->protocols[0].callback(context, wsi,
+			LWS_CALLBACK_CLOSED_HTTP, wsi->user_space, NULL, 0 );
+	} else
+		lwsl_debug("not calling back closed\n");
+
+	/* deallocate any active extension contexts */
+	
+	if (lws_ext_callback_for_each_active(wsi, LWS_EXT_CALLBACK_DESTROY, NULL, 0) < 0)
+		lwsl_warn("extension destruction failed\n");
+#ifndef LWS_NO_EXTENSIONS
+	for (n = 0; n < wsi->count_active_extensions; n++)
+		lws_free(wsi->active_extensions_user[n]);
+#endif
+	/*
+	 * inform all extensions in case they tracked this guy out of band
+	 * even though not active on him specifically
+	 */
+	if (lws_ext_callback_for_each_extension_type(context, wsi,
+		       LWS_EXT_CALLBACK_DESTROY_ANY_WSI_CLOSING, NULL, 0) < 0)
+		lwsl_warn("ext destroy wsi failed\n");
+
+/*	lwsl_info("closing fd=%d\n", wsi->sock); */
+
+	if (!lws_ssl_close(wsi) && wsi->sock >= 0) {
+		n = shutdown(wsi->sock, SHUT_RDWR);
+		if (n)
+			lwsl_debug("closing: shutdown ret %d\n", LWS_ERRNO);
+
+		n = compatible_close(wsi->sock);
+		if (n)
+			lwsl_debug("closing: close ret %d\n", LWS_ERRNO);
+	}
+
+	/* outermost destroy notification for wsi (user_space still intact) */
+	context->protocols[0].callback(context, wsi,
+			LWS_CALLBACK_WSI_DESTROY, wsi->user_space, NULL, 0);
+
+	if (wsi->protocol && wsi->protocol->per_session_data_size &&
+	    wsi->user_space && !wsi->user_space_externally_allocated)
+		lws_free(wsi->user_space);
+
+	/* As a precaution, free the header table in case it lingered: */
+	lws_free_header_table(wsi);
+	lws_free(wsi);
+}
+
+/**
+ * libwebsockets_get_peer_addresses() - Get client address information
+ * @context:	Libwebsockets context
+ * @wsi:	Local struct libwebsocket associated with
+ * @fd:		Connection socket descriptor
+ * @name:	Buffer to take client address name
+ * @name_len:	Length of client address name buffer
+ * @rip:	Buffer to take client address IP dotted quad
+ * @rip_len:	Length of client address IP buffer
+ *
+ *	This function fills in @name and @rip with the name and IP of
+ *	the client connected with socket descriptor @fd.  Names may be
+ *	truncated if there is not enough room.  If either cannot be
+ *	determined, they will be returned as valid zero-length strings.
+ */
+
+LWS_VISIBLE void
+libwebsockets_get_peer_addresses(struct libwebsocket_context *context,
+	struct libwebsocket *wsi, int fd, char *name, int name_len,
+					char *rip, int rip_len)
+{
+	socklen_t len;
+#ifdef LWS_USE_IPV6
+	struct sockaddr_in6 sin6;
+#endif
+	struct sockaddr_in sin4;
+	struct hostent *host;
+	struct hostent *host1;
+	char ip[128];
+	unsigned char *p;
+	int n;
+#ifdef AF_LOCAL
+	struct sockaddr_un *un;
+#endif
+	int ret = -1;
+
+	rip[0] = '\0';
+	name[0] = '\0';
+
+	lws_latency_pre(context, wsi);
+
+#ifdef LWS_USE_IPV6
+	if (LWS_IPV6_ENABLED(context)) {
+
+		len = sizeof(sin6);
+		if (getpeername(fd, (struct sockaddr *) &sin6, &len) < 0) {
+			lwsl_warn("getpeername: %s\n", strerror(LWS_ERRNO));
+			goto bail;
+		}
+
+		if (!lws_plat_inet_ntop(AF_INET6, &sin6.sin6_addr, rip, rip_len)) {
+			lwsl_err("inet_ntop", strerror(LWS_ERRNO));
+			goto bail;
+		}
+
+		// Strip off the IPv4 to IPv6 header if one exists
+		if (strncmp(rip, "::ffff:", 7) == 0)
+			memmove(rip, rip + 7, strlen(rip) - 6);
+
+		getnameinfo((struct sockaddr *)&sin6,
+				sizeof(struct sockaddr_in6), name,
+							name_len, NULL, 0, 0);
+
+	} else
+#endif
+	{
+		len = sizeof(sin4);
+		if (getpeername(fd, (struct sockaddr *) &sin4, &len) < 0) {
+			lwsl_warn("getpeername: %s\n", strerror(LWS_ERRNO));
+			goto bail;
+		}
+		host = gethostbyaddr((char *) &sin4.sin_addr,
+						sizeof(sin4.sin_addr), AF_INET);
+		if (host == NULL) {
+			lwsl_warn("gethostbyaddr: %s\n", strerror(LWS_ERRNO));
+			goto bail;
+		}
+
+		strncpy(name, host->h_name, name_len);
+		name[name_len - 1] = '\0';
+
+		host1 = gethostbyname(host->h_name);
+		if (host1 == NULL)
+			goto bail;
+		p = (unsigned char *)host1;
+		n = 0;
+		while (p != NULL) {
+			p = (unsigned char *)host1->h_addr_list[n++];
+			if (p == NULL)
+				continue;
+			if ((host1->h_addrtype != AF_INET)
+#ifdef AF_LOCAL
+				&& (host1->h_addrtype != AF_LOCAL)
+#endif
+				)
+				continue;
+
+			if (host1->h_addrtype == AF_INET)
+				sprintf(ip, "%u.%u.%u.%u",
+						p[0], p[1], p[2], p[3]);
+#ifdef AF_LOCAL
+			else {
+				un = (struct sockaddr_un *)p;
+				strncpy(ip, un->sun_path, sizeof(ip) - 1);
+				ip[sizeof(ip) - 1] = '\0';
+			}
+#endif
+			p = NULL;
+			strncpy(rip, ip, rip_len);
+			rip[rip_len - 1] = '\0';
+		}
+	}
+
+	ret = 0;
+bail:
+	lws_latency(context, wsi, "libwebsockets_get_peer_addresses", ret, 1);
+}
+
+
+
+/**
+ * libwebsocket_context_user() - get the user data associated with the context
+ * @context: Websocket context
+ *
+ *	This returns the optional user allocation that can be attached to
+ *	the context the sockets live in at context_create time.  It's a way
+ *	to let all sockets serviced in the same context share data without
+ *	using globals statics in the user code.
+ */
+LWS_EXTERN void *
+libwebsocket_context_user(struct libwebsocket_context *context)
+{
+	return context->user_space;
+}
+
+
+/**
+ * libwebsocket_callback_all_protocol() - Callback all connections using
+ *				the given protocol with the given reason
+ *
+ * @protocol:	Protocol whose connections will get callbacks
+ * @reason:	Callback reason index
+ */
+
+LWS_VISIBLE int
+libwebsocket_callback_all_protocol(
+		const struct libwebsocket_protocols *protocol, int reason)
+{
+	struct libwebsocket_context *context = protocol->owning_server;
+	int n;
+	struct libwebsocket *wsi;
+
+	for (n = 0; n < context->fds_count; n++) {
+		wsi = context->lws_lookup[context->fds[n].fd];
+		if (!wsi)
+			continue;
+		if (wsi->protocol == protocol)
+			protocol->callback(context, wsi,
+					reason, wsi->user_space, NULL, 0);
+	}
+
+	return 0;
+}
+
+/**
+ * libwebsocket_set_timeout() - marks the wsi as subject to a timeout
+ *
+ * You will not need this unless you are doing something special
+ *
+ * @wsi:	Websocket connection instance
+ * @reason:	timeout reason
+ * @secs:	how many seconds
+ */
+
+LWS_VISIBLE void
+libwebsocket_set_timeout(struct libwebsocket *wsi,
+					  enum pending_timeout reason, int secs)
+{
+	time_t now;
+
+	time(&now);
+
+	wsi->pending_timeout_limit = now + secs;
+	wsi->pending_timeout = reason;
+}
+
+
+/**
+ * libwebsocket_get_socket_fd() - returns the socket file descriptor
+ *
+ * You will not need this unless you are doing something special
+ *
+ * @wsi:	Websocket connection instance
+ */
+
+LWS_VISIBLE int
+libwebsocket_get_socket_fd(struct libwebsocket *wsi)
+{
+	return wsi->sock;
+}
+
+#ifdef LWS_LATENCY
+void
+lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi,
+				     const char *action, int ret, int completed)
+{
+	unsigned long long u;
+	char buf[256];
+
+	u = time_in_microseconds();
+
+	if (!action) {
+		wsi->latency_start = u;
+		if (!wsi->action_start)
+			wsi->action_start = u;
+		return;
+	}
+	if (completed) {
+		if (wsi->action_start == wsi->latency_start)
+			sprintf(buf,
+			  "Completion first try lat %lluus: %p: ret %d: %s\n",
+					u - wsi->latency_start,
+						      (void *)wsi, ret, action);
+		else
+			sprintf(buf,
+			  "Completion %lluus: lat %lluus: %p: ret %d: %s\n",
+				u - wsi->action_start,
+					u - wsi->latency_start,
+						      (void *)wsi, ret, action);
+		wsi->action_start = 0;
+	} else
+		sprintf(buf, "lat %lluus: %p: ret %d: %s\n",
+			      u - wsi->latency_start, (void *)wsi, ret, action);
+
+	if (u - wsi->latency_start > context->worst_latency) {
+		context->worst_latency = u - wsi->latency_start;
+		strcpy(context->worst_latency_info, buf);
+	}
+	lwsl_latency("%s", buf);
+}
+#endif
+
+
+
+/**
+ * libwebsocket_rx_flow_control() - Enable and disable socket servicing for
+ *				received packets.
+ *
+ * If the output side of a server process becomes choked, this allows flow
+ * control for the input side.
+ *
+ * @wsi:	Websocket connection instance to get callback for
+ * @enable:	0 = disable read servicing for this connection, 1 = enable
+ */
+
+LWS_VISIBLE int
+libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable)
+{
+	if (enable == (wsi->rxflow_change_to & LWS_RXFLOW_ALLOW))
+		return 0;
+
+	lwsl_info("libwebsocket_rx_flow_control(0x%p, %d)\n", wsi, enable);
+	wsi->rxflow_change_to = LWS_RXFLOW_PENDING_CHANGE | !!enable;
+
+	return 0;
+}
+
+/**
+ * libwebsocket_rx_flow_allow_all_protocol() - Allow all connections with this protocol to receive
+ *
+ * When the user server code realizes it can accept more input, it can
+ * call this to have the RX flow restriction removed from all connections using
+ * the given protocol.
+ *
+ * @protocol:	all connections using this protocol will be allowed to receive
+ */
+
+LWS_VISIBLE void
+libwebsocket_rx_flow_allow_all_protocol(
+				const struct libwebsocket_protocols *protocol)
+{
+	struct libwebsocket_context *context = protocol->owning_server;
+	int n;
+	struct libwebsocket *wsi;
+
+	for (n = 0; n < context->fds_count; n++) {
+		wsi = context->lws_lookup[context->fds[n].fd];
+		if (!wsi)
+			continue;
+		if (wsi->protocol == protocol)
+			libwebsocket_rx_flow_control(wsi, LWS_RXFLOW_ALLOW);
+	}
+}
+
+
+/**
+ * libwebsocket_canonical_hostname() - returns this host's hostname
+ *
+ * This is typically used by client code to fill in the host parameter
+ * when making a client connection.  You can only call it after the context
+ * has been created.
+ *
+ * @context:	Websocket context
+ */
+LWS_VISIBLE extern const char *
+libwebsocket_canonical_hostname(struct libwebsocket_context *context)
+{
+	return (const char *)context->canonical_hostname;
+}
+
+int user_callback_handle_rxflow(callback_function callback_function,
+		struct libwebsocket_context *context,
+			struct libwebsocket *wsi,
+			 enum libwebsocket_callback_reasons reason, void *user,
+							  void *in, size_t len)
+{
+	int n;
+
+	n = callback_function(context, wsi, reason, user, in, len);
+	if (!n)
+		n = _libwebsocket_rx_flow_control(wsi);
+
+	return n;
+}
+
+
+/**
+ * libwebsocket_set_proxy() - Setups proxy to libwebsocket_context.
+ * @context:	pointer to struct libwebsocket_context you want set proxy to
+ * @proxy: pointer to c string containing proxy in format address:port
+ *
+ * Returns 0 if proxy string was parsed and proxy was setup. 
+ * Returns -1 if @proxy is NULL or has incorrect format.
+ *
+ * This is only required if your OS does not provide the http_proxy
+ * environment variable (eg, OSX)
+ *
+ *   IMPORTANT! You should call this function right after creation of the
+ *   libwebsocket_context and before call to connect. If you call this
+ *   function after connect behavior is undefined.
+ *   This function will override proxy settings made on libwebsocket_context
+ *   creation with genenv() call.
+ */
+
+LWS_VISIBLE int
+libwebsocket_set_proxy(struct libwebsocket_context *context, const char *proxy)
+{
+	char *p;
+	
+	if (!proxy)
+		return -1;
+
+	strncpy(context->http_proxy_address, proxy,
+				sizeof(context->http_proxy_address) - 1);
+	context->http_proxy_address[
+				sizeof(context->http_proxy_address) - 1] = '\0';
+	
+	p = strchr(context->http_proxy_address, ':');
+	if (!p) {
+		lwsl_err("http_proxy needs to be ads:port\n");
+
+		return -1;
+	}
+	*p = '\0';
+	context->http_proxy_port = atoi(p + 1);
+	
+	lwsl_notice(" Proxy %s:%u\n", context->http_proxy_address,
+						context->http_proxy_port);
+
+	return 0;
+}
+
+/**
+ * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket
+ *				  connection.
+ * @wsi:	pointer to struct websocket you want to know the protocol of
+ *
+ *
+ *	Some apis can act on all live connections of a given protocol,
+ *	this is how you can get a pointer to the active protocol if needed.
+ */
+
+LWS_VISIBLE const struct libwebsocket_protocols *
+libwebsockets_get_protocol(struct libwebsocket *wsi)
+{
+	return wsi->protocol;
+}
+
+LWS_VISIBLE int
+libwebsocket_is_final_fragment(struct libwebsocket *wsi)
+{
+	return wsi->u.ws.final;
+}
+
+LWS_VISIBLE unsigned char
+libwebsocket_get_reserved_bits(struct libwebsocket *wsi)
+{
+	return wsi->u.ws.rsv;
+}
+
+int
+libwebsocket_ensure_user_space(struct libwebsocket *wsi)
+{
+	lwsl_info("%s: %p protocol %p\n", __func__, wsi, wsi->protocol);
+	if (!wsi->protocol)
+		return 1;
+
+	/* allocate the per-connection user memory (if any) */
+
+	if (wsi->protocol->per_session_data_size && !wsi->user_space) {
+		wsi->user_space = lws_zalloc(wsi->protocol->per_session_data_size);
+		if (wsi->user_space  == NULL) {
+			lwsl_err("Out of memory for conn user space\n");
+			return 1;
+		}
+	} else
+		lwsl_info("%s: %p protocol pss %u, user_space=%d\n", __func__, wsi, wsi->protocol->per_session_data_size, wsi->user_space);
+	return 0;
+}
+
+LWS_VISIBLE void lwsl_emit_stderr(int level, const char *line)
+{
+	char buf[300];
+	unsigned long long now;
+	int n;
+
+	buf[0] = '\0';
+	for (n = 0; n < LLL_COUNT; n++)
+		if (level == (1 << n)) {
+			now = time_in_microseconds() / 100;
+			sprintf(buf, "[%lu:%04d] %s: ", (unsigned long) now / 10000,
+				(int)(now % 10000), log_level_names[n]);
+			break;
+		}
+
+	fprintf(stderr, "%s%s", buf, line);
+}
+
+
+LWS_VISIBLE void _lws_logv(int filter, const char *format, va_list vl)
+{
+	char buf[256];
+
+	if (!(log_level & filter))
+		return;
+
+	vsnprintf(buf, sizeof(buf), format, vl);
+	buf[sizeof(buf) - 1] = '\0';
+
+	lwsl_emit(filter, buf);
+}
+
+LWS_VISIBLE void _lws_log(int filter, const char *format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	_lws_logv(filter, format, ap);
+	va_end(ap);
+}
+
+/**
+ * lws_set_log_level() - Set the logging bitfield
+ * @level:	OR together the LLL_ debug contexts you want output from
+ * @log_emit_function:	NULL to leave it as it is, or a user-supplied
+ *			function to perform log string emission instead of
+ *			the default stderr one.
+ *
+ *	log level defaults to "err", "warn" and "notice" contexts enabled and
+ *	emission on stderr.
+ */
+
+LWS_VISIBLE void lws_set_log_level(int level, void (*log_emit_function)(int level,
+							      const char *line))
+{
+	log_level = level;
+	if (log_emit_function)
+		lwsl_emit = log_emit_function;
+}
+
+/**
+ * lws_use_ssl() - Find out if connection is using SSL
+ * @wsi:	websocket connection to check
+ *
+ *	Returns 0 if the connection is not using SSL, 1 if using SSL and
+ *	using verified cert, and 2 if using SSL but the cert was not
+ *	checked (appears for client wsi told to skip check on connection)
+ */
+LWS_VISIBLE int
+lws_is_ssl(struct libwebsocket *wsi)
+{
+#ifdef LWS_OPENSSL_SUPPORT
+	return wsi->use_ssl;
+#else
+	return 0;
+#endif
+}
+
+/**
+ * lws_partial_buffered() - find out if lws buffered the last write
+ * @wsi:	websocket connection to check
+ *
+ * Returns 1 if you cannot use libwebsocket_write because the last
+ * write on this connection is still buffered, and can't be cleared without
+ * returning to the service loop and waiting for the connection to be
+ * writeable again.
+ * 
+ * If you will try to do >1 libwebsocket_write call inside a single
+ * WRITEABLE callback, you must check this after every write and bail if
+ * set, ask for a new writeable callback and continue writing from there.
+ * 
+ * This is never set at the start of a writeable callback, but any write
+ * may set it.
+ */
+
+LWS_VISIBLE int
+lws_partial_buffered(struct libwebsocket *wsi)
+{
+	return !!wsi->truncated_send_len;	
+}
+
+void lws_set_protocol_write_pending(struct libwebsocket_context *context,
+				    struct libwebsocket *wsi,
+				    enum lws_pending_protocol_send pend)
+{
+	lwsl_info("setting pps %d\n", pend);
+	
+	if (wsi->pps)
+		lwsl_err("pps overwrite\n");
+	wsi->pps = pend;
+	libwebsocket_rx_flow_control(wsi, 0);
+	libwebsocket_callback_on_writable(context, wsi);
+}
+
+LWS_VISIBLE size_t
+lws_get_peer_write_allowance(struct libwebsocket *wsi)
+{
+#ifdef LWS_USE_HTTP2
+	/* only if we are using HTTP2 on this connection */
+	if (wsi->mode != LWS_CONNMODE_HTTP2_SERVING)
+		return -1;
+	/* user is only interested in how much he can send, or that he can't  */
+	if (wsi->u.http2.tx_credit <= 0)
+		return 0;
+	
+	return wsi->u.http2.tx_credit;
+#else
+	return -1;
+#endif
+}
+
+LWS_VISIBLE void
+lws_union_transition(struct libwebsocket *wsi, enum connection_mode mode)
+{
+	memset(&wsi->u, 0, sizeof(wsi->u));
+	wsi->mode = mode;
+}