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Hype-2/static/core/rfb.js

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2023-10-17 08:03:51 +00:00
/*
* noVNC: HTML5 VNC client
* Copyright (C) 2020 The noVNC Authors
* Licensed under MPL 2.0 (see LICENSE.txt)
*
* See README.md for usage and integration instructions.
*
*/
import { toUnsigned32bit, toSigned32bit } from './util/int.js';
import * as Log from './util/logging.js';
import { encodeUTF8, decodeUTF8 } from './util/strings.js';
import { dragThreshold } from './util/browser.js';
import { clientToElement } from './util/element.js';
import { setCapture } from './util/events.js';
import EventTargetMixin from './util/eventtarget.js';
import Display from "./display.js";
import Inflator from "./inflator.js";
import Deflator from "./deflator.js";
import Keyboard from "./input/keyboard.js";
import GestureHandler from "./input/gesturehandler.js";
import Cursor from "./util/cursor.js";
import Websock from "./websock.js";
import DES from "./des.js";
import KeyTable from "./input/keysym.js";
import XtScancode from "./input/xtscancodes.js";
import { encodings } from "./encodings.js";
import RawDecoder from "./decoders/raw.js";
import CopyRectDecoder from "./decoders/copyrect.js";
import RREDecoder from "./decoders/rre.js";
import HextileDecoder from "./decoders/hextile.js";
import TightDecoder from "./decoders/tight.js";
import TightPNGDecoder from "./decoders/tightpng.js";
// How many seconds to wait for a disconnect to finish
const DISCONNECT_TIMEOUT = 3;
const DEFAULT_BACKGROUND = 'rgb(40, 40, 40)';
// Minimum wait (ms) between two mouse moves
const MOUSE_MOVE_DELAY = 17;
// Wheel thresholds
const WHEEL_STEP = 50; // Pixels needed for one step
const WHEEL_LINE_HEIGHT = 19; // Assumed pixels for one line step
// Gesture thresholds
const GESTURE_ZOOMSENS = 75;
const GESTURE_SCRLSENS = 50;
const DOUBLE_TAP_TIMEOUT = 1000;
const DOUBLE_TAP_THRESHOLD = 50;
// Extended clipboard pseudo-encoding formats
const extendedClipboardFormatText = 1;
/*eslint-disable no-unused-vars */
const extendedClipboardFormatRtf = 1 << 1;
const extendedClipboardFormatHtml = 1 << 2;
const extendedClipboardFormatDib = 1 << 3;
const extendedClipboardFormatFiles = 1 << 4;
/*eslint-enable */
// Extended clipboard pseudo-encoding actions
const extendedClipboardActionCaps = 1 << 24;
const extendedClipboardActionRequest = 1 << 25;
const extendedClipboardActionPeek = 1 << 26;
const extendedClipboardActionNotify = 1 << 27;
const extendedClipboardActionProvide = 1 << 28;
export default class RFB extends EventTargetMixin {
constructor(target, urlOrChannel, options) {
if (!target) {
throw new Error("Must specify target");
}
if (!urlOrChannel) {
throw new Error("Must specify URL, WebSocket or RTCDataChannel");
}
super();
this._target = target;
if (typeof urlOrChannel === "string") {
this._url = urlOrChannel;
} else {
this._url = null;
this._rawChannel = urlOrChannel;
}
// Connection details
options = options || {};
this._rfbCredentials = options.credentials || {};
this._shared = 'shared' in options ? !!options.shared : true;
this._repeaterID = options.repeaterID || '';
this._wsProtocols = options.wsProtocols || [];
// Internal state
this._rfbConnectionState = '';
this._rfbInitState = '';
this._rfbAuthScheme = -1;
this._rfbCleanDisconnect = true;
// Server capabilities
this._rfbVersion = 0;
this._rfbMaxVersion = 3.8;
this._rfbTightVNC = false;
this._rfbVeNCryptState = 0;
this._rfbXvpVer = 0;
this._fbWidth = 0;
this._fbHeight = 0;
this._fbName = "";
this._capabilities = { power: false };
this._supportsFence = false;
this._supportsContinuousUpdates = false;
this._enabledContinuousUpdates = false;
this._supportsSetDesktopSize = false;
this._screenID = 0;
this._screenFlags = 0;
this._qemuExtKeyEventSupported = false;
this._clipboardText = null;
this._clipboardServerCapabilitiesActions = {};
this._clipboardServerCapabilitiesFormats = {};
// Internal objects
this._sock = null; // Websock object
this._display = null; // Display object
this._flushing = false; // Display flushing state
this._keyboard = null; // Keyboard input handler object
this._gestures = null; // Gesture input handler object
this._resizeObserver = null; // Resize observer object
// Timers
this._disconnTimer = null; // disconnection timer
this._resizeTimeout = null; // resize rate limiting
this._mouseMoveTimer = null;
// Decoder states
this._decoders = {};
this._FBU = {
rects: 0,
x: 0,
y: 0,
width: 0,
height: 0,
encoding: null,
};
// Mouse state
this._mousePos = {};
this._mouseButtonMask = 0;
this._mouseLastMoveTime = 0;
this._viewportDragging = false;
this._viewportDragPos = {};
this._viewportHasMoved = false;
this._accumulatedWheelDeltaX = 0;
this._accumulatedWheelDeltaY = 0;
// Gesture state
this._gestureLastTapTime = null;
this._gestureFirstDoubleTapEv = null;
this._gestureLastMagnitudeX = 0;
this._gestureLastMagnitudeY = 0;
// Bound event handlers
this._eventHandlers = {
focusCanvas: this._focusCanvas.bind(this),
handleResize: this._handleResize.bind(this),
handleMouse: this._handleMouse.bind(this),
handleWheel: this._handleWheel.bind(this),
handleGesture: this._handleGesture.bind(this),
};
// main setup
Log.Debug(">> RFB.constructor");
// Create DOM elements
this._screen = document.createElement('div');
this._screen.style.display = 'flex';
this._screen.style.width = '100%';
this._screen.style.height = '100%';
this._screen.style.overflow = 'auto';
this._screen.style.background = DEFAULT_BACKGROUND;
this._canvas = document.createElement('canvas');
this._canvas.style.margin = 'auto';
// Some browsers add an outline on focus
this._canvas.style.outline = 'none';
this._canvas.width = 0;
this._canvas.height = 0;
this._canvas.tabIndex = -1;
this._screen.appendChild(this._canvas);
// Cursor
this._cursor = new Cursor();
// XXX: TightVNC 2.8.11 sends no cursor at all until Windows changes
// it. Result: no cursor at all until a window border or an edit field
// is hit blindly. But there are also VNC servers that draw the cursor
// in the framebuffer and don't send the empty local cursor. There is
// no way to satisfy both sides.
//
// The spec is unclear on this "initial cursor" issue. Many other
// viewers (TigerVNC, RealVNC, Remmina) display an arrow as the
// initial cursor instead.
this._cursorImage = RFB.cursors.none;
// populate decoder array with objects
this._decoders[encodings.encodingRaw] = new RawDecoder();
this._decoders[encodings.encodingCopyRect] = new CopyRectDecoder();
this._decoders[encodings.encodingRRE] = new RREDecoder();
this._decoders[encodings.encodingHextile] = new HextileDecoder();
this._decoders[encodings.encodingTight] = new TightDecoder();
this._decoders[encodings.encodingTightPNG] = new TightPNGDecoder();
// NB: nothing that needs explicit teardown should be done
// before this point, since this can throw an exception
try {
this._display = new Display(this._canvas);
} catch (exc) {
Log.Error("Display exception: " + exc);
throw exc;
}
this._display.onflush = this._onFlush.bind(this);
this._keyboard = new Keyboard(this._canvas);
this._keyboard.onkeyevent = this._handleKeyEvent.bind(this);
this._gestures = new GestureHandler();
this._sock = new Websock();
this._sock.on('open', this._socketOpen.bind(this));
this._sock.on('close', this._socketClose.bind(this));
this._sock.on('message', this._handleMessage.bind(this));
this._sock.on('error', this._socketError.bind(this));
this._resizeObserver = new ResizeObserver(this._eventHandlers.handleResize);
// All prepared, kick off the connection
this._updateConnectionState('connecting');
Log.Debug("<< RFB.constructor");
// ===== PROPERTIES =====
this.dragViewport = false;
this.focusOnClick = true;
this._viewOnly = false;
this._clipViewport = false;
this._scaleViewport = false;
this._resizeSession = false;
this._showDotCursor = false;
if (options.showDotCursor !== undefined) {
Log.Warn("Specifying showDotCursor as a RFB constructor argument is deprecated");
this._showDotCursor = options.showDotCursor;
}
this._qualityLevel = 6;
this._compressionLevel = 2;
}
// ===== PROPERTIES =====
get viewOnly() { return this._viewOnly; }
set viewOnly(viewOnly) {
this._viewOnly = viewOnly;
if (this._rfbConnectionState === "connecting" ||
this._rfbConnectionState === "connected") {
if (viewOnly) {
this._keyboard.ungrab();
} else {
this._keyboard.grab();
}
}
}
get capabilities() { return this._capabilities; }
get touchButton() { return 0; }
set touchButton(button) { Log.Warn("Using old API!"); }
get clipViewport() { return this._clipViewport; }
set clipViewport(viewport) {
this._clipViewport = viewport;
this._updateClip();
}
get scaleViewport() { return this._scaleViewport; }
set scaleViewport(scale) {
this._scaleViewport = scale;
// Scaling trumps clipping, so we may need to adjust
// clipping when enabling or disabling scaling
if (scale && this._clipViewport) {
this._updateClip();
}
this._updateScale();
if (!scale && this._clipViewport) {
this._updateClip();
}
}
get resizeSession() { return this._resizeSession; }
set resizeSession(resize) {
this._resizeSession = resize;
if (resize) {
this._requestRemoteResize();
}
}
get showDotCursor() { return this._showDotCursor; }
set showDotCursor(show) {
this._showDotCursor = show;
this._refreshCursor();
}
get background() { return this._screen.style.background; }
set background(cssValue) { this._screen.style.background = cssValue; }
get qualityLevel() {
return this._qualityLevel;
}
set qualityLevel(qualityLevel) {
if (!Number.isInteger(qualityLevel) || qualityLevel < 0 || qualityLevel > 9) {
Log.Error("qualityLevel must be an integer between 0 and 9");
return;
}
if (this._qualityLevel === qualityLevel) {
return;
}
this._qualityLevel = qualityLevel;
if (this._rfbConnectionState === 'connected') {
this._sendEncodings();
}
}
get compressionLevel() {
return this._compressionLevel;
}
set compressionLevel(compressionLevel) {
if (!Number.isInteger(compressionLevel) || compressionLevel < 0 || compressionLevel > 9) {
Log.Error("compressionLevel must be an integer between 0 and 9");
return;
}
if (this._compressionLevel === compressionLevel) {
return;
}
this._compressionLevel = compressionLevel;
if (this._rfbConnectionState === 'connected') {
this._sendEncodings();
}
}
// ===== PUBLIC METHODS =====
disconnect() {
this._updateConnectionState('disconnecting');
this._sock.off('error');
this._sock.off('message');
this._sock.off('open');
}
sendCredentials(creds) {
this._rfbCredentials = creds;
setTimeout(this._initMsg.bind(this), 0);
}
sendCtrlAltDel() {
if (this._rfbConnectionState !== 'connected' || this._viewOnly) { return; }
Log.Info("Sending Ctrl-Alt-Del");
this.sendKey(KeyTable.XK_Control_L, "ControlLeft", true);
this.sendKey(KeyTable.XK_Alt_L, "AltLeft", true);
this.sendKey(KeyTable.XK_Delete, "Delete", true);
this.sendKey(KeyTable.XK_Delete, "Delete", false);
this.sendKey(KeyTable.XK_Alt_L, "AltLeft", false);
this.sendKey(KeyTable.XK_Control_L, "ControlLeft", false);
}
machineShutdown() {
this._xvpOp(1, 2);
}
machineReboot() {
this._xvpOp(1, 3);
}
machineReset() {
this._xvpOp(1, 4);
}
// Send a key press. If 'down' is not specified then send a down key
// followed by an up key.
sendKey(keysym, code, down) {
if (this._rfbConnectionState !== 'connected' || this._viewOnly) { return; }
if (down === undefined) {
this.sendKey(keysym, code, true);
this.sendKey(keysym, code, false);
return;
}
const scancode = XtScancode[code];
if (this._qemuExtKeyEventSupported && scancode) {
// 0 is NoSymbol
keysym = keysym || 0;
Log.Info("Sending key (" + (down ? "down" : "up") + "): keysym " + keysym + ", scancode " + scancode);
RFB.messages.QEMUExtendedKeyEvent(this._sock, keysym, down, scancode);
} else {
if (!keysym) {
return;
}
Log.Info("Sending keysym (" + (down ? "down" : "up") + "): " + keysym);
RFB.messages.keyEvent(this._sock, keysym, down ? 1 : 0);
}
}
focus() {
this._canvas.focus();
}
blur() {
this._canvas.blur();
}
clipboardPasteFrom(text) {
if (this._rfbConnectionState !== 'connected' || this._viewOnly) { return; }
if (this._clipboardServerCapabilitiesFormats[extendedClipboardFormatText] &&
this._clipboardServerCapabilitiesActions[extendedClipboardActionNotify]) {
this._clipboardText = text;
RFB.messages.extendedClipboardNotify(this._sock, [extendedClipboardFormatText]);
} else {
let data = new Uint8Array(text.length);
for (let i = 0; i < text.length; i++) {
// FIXME: text can have values outside of Latin1/Uint8
data[i] = text.charCodeAt(i);
}
RFB.messages.clientCutText(this._sock, data);
}
}
// ===== PRIVATE METHODS =====
_connect() {
Log.Debug(">> RFB.connect");
if (this._url) {
Log.Info(`connecting to ${this._url}`);
this._sock.open(this._url, this._wsProtocols);
} else {
Log.Info(`attaching ${this._rawChannel} to Websock`);
this._sock.attach(this._rawChannel);
if (this._sock.readyState === 'closed') {
throw Error("Cannot use already closed WebSocket/RTCDataChannel");
}
if (this._sock.readyState === 'open') {
// FIXME: _socketOpen() can in theory call _fail(), which
// isn't allowed this early, but I'm not sure that can
// happen without a bug messing up our state variables
this._socketOpen();
}
}
// Make our elements part of the page
this._target.appendChild(this._screen);
this._gestures.attach(this._canvas);
this._cursor.attach(this._canvas);
this._refreshCursor();
// Monitor size changes of the screen element
this._resizeObserver.observe(this._screen);
// Always grab focus on some kind of click event
this._canvas.addEventListener("mousedown", this._eventHandlers.focusCanvas);
this._canvas.addEventListener("touchstart", this._eventHandlers.focusCanvas);
// Mouse events
this._canvas.addEventListener('mousedown', this._eventHandlers.handleMouse);
this._canvas.addEventListener('mouseup', this._eventHandlers.handleMouse);
this._canvas.addEventListener('mousemove', this._eventHandlers.handleMouse);
// Prevent middle-click pasting (see handler for why we bind to document)
this._canvas.addEventListener('click', this._eventHandlers.handleMouse);
// preventDefault() on mousedown doesn't stop this event for some
// reason so we have to explicitly block it
this._canvas.addEventListener('contextmenu', this._eventHandlers.handleMouse);
// Wheel events
this._canvas.addEventListener("wheel", this._eventHandlers.handleWheel);
// Gesture events
this._canvas.addEventListener("gesturestart", this._eventHandlers.handleGesture);
this._canvas.addEventListener("gesturemove", this._eventHandlers.handleGesture);
this._canvas.addEventListener("gestureend", this._eventHandlers.handleGesture);
Log.Debug("<< RFB.connect");
}
_disconnect() {
Log.Debug(">> RFB.disconnect");
this._cursor.detach();
this._canvas.removeEventListener("gesturestart", this._eventHandlers.handleGesture);
this._canvas.removeEventListener("gesturemove", this._eventHandlers.handleGesture);
this._canvas.removeEventListener("gestureend", this._eventHandlers.handleGesture);
this._canvas.removeEventListener("wheel", this._eventHandlers.handleWheel);
this._canvas.removeEventListener('mousedown', this._eventHandlers.handleMouse);
this._canvas.removeEventListener('mouseup', this._eventHandlers.handleMouse);
this._canvas.removeEventListener('mousemove', this._eventHandlers.handleMouse);
this._canvas.removeEventListener('click', this._eventHandlers.handleMouse);
this._canvas.removeEventListener('contextmenu', this._eventHandlers.handleMouse);
this._canvas.removeEventListener("mousedown", this._eventHandlers.focusCanvas);
this._canvas.removeEventListener("touchstart", this._eventHandlers.focusCanvas);
this._resizeObserver.disconnect();
this._keyboard.ungrab();
this._gestures.detach();
this._sock.close();
try {
this._target.removeChild(this._screen);
} catch (e) {
if (e.name === 'NotFoundError') {
// Some cases where the initial connection fails
// can disconnect before the _screen is created
} else {
throw e;
}
}
clearTimeout(this._resizeTimeout);
clearTimeout(this._mouseMoveTimer);
Log.Debug("<< RFB.disconnect");
}
_socketOpen() {
if ((this._rfbConnectionState === 'connecting') &&
(this._rfbInitState === '')) {
this._rfbInitState = 'ProtocolVersion';
Log.Debug("Starting VNC handshake");
} else {
this._fail("Unexpected server connection while " +
this._rfbConnectionState);
}
}
_socketClose(e) {
Log.Debug("WebSocket on-close event");
let msg = "";
if (e.code) {
msg = "(code: " + e.code;
if (e.reason) {
msg += ", reason: " + e.reason;
}
msg += ")";
}
switch (this._rfbConnectionState) {
case 'connecting':
this._fail("Connection closed " + msg);
break;
case 'connected':
// Handle disconnects that were initiated server-side
this._updateConnectionState('disconnecting');
this._updateConnectionState('disconnected');
break;
case 'disconnecting':
// Normal disconnection path
this._updateConnectionState('disconnected');
break;
case 'disconnected':
this._fail("Unexpected server disconnect " +
"when already disconnected " + msg);
break;
default:
this._fail("Unexpected server disconnect before connecting " +
msg);
break;
}
this._sock.off('close');
// Delete reference to raw channel to allow cleanup.
this._rawChannel = null;
}
_socketError(e) {
Log.Warn("WebSocket on-error event");
}
_focusCanvas(event) {
if (!this.focusOnClick) {
return;
}
this.focus();
}
_setDesktopName(name) {
this._fbName = name;
this.dispatchEvent(new CustomEvent(
"desktopname",
{ detail: { name: this._fbName } }));
}
_handleResize() {
// If the window resized then our screen element might have
// as well. Update the viewport dimensions.
window.requestAnimationFrame(() => {
this._updateClip();
this._updateScale();
});
if (this._resizeSession) {
// Request changing the resolution of the remote display to
// the size of the local browser viewport.
// In order to not send multiple requests before the browser-resize
// is finished we wait 0.5 seconds before sending the request.
clearTimeout(this._resizeTimeout);
this._resizeTimeout = setTimeout(this._requestRemoteResize.bind(this), 500);
}
}
// Update state of clipping in Display object, and make sure the
// configured viewport matches the current screen size
_updateClip() {
const curClip = this._display.clipViewport;
let newClip = this._clipViewport;
if (this._scaleViewport) {
// Disable viewport clipping if we are scaling
newClip = false;
}
if (curClip !== newClip) {
this._display.clipViewport = newClip;
}
if (newClip) {
// When clipping is enabled, the screen is limited to
// the size of the container.
const size = this._screenSize();
this._display.viewportChangeSize(size.w, size.h);
this._fixScrollbars();
}
}
_updateScale() {
if (!this._scaleViewport) {
this._display.scale = 1.0;
} else {
const size = this._screenSize();
this._display.autoscale(size.w, size.h);
}
this._fixScrollbars();
}
// Requests a change of remote desktop size. This message is an extension
// and may only be sent if we have received an ExtendedDesktopSize message
_requestRemoteResize() {
clearTimeout(this._resizeTimeout);
this._resizeTimeout = null;
if (!this._resizeSession || this._viewOnly ||
!this._supportsSetDesktopSize) {
return;
}
const size = this._screenSize();
RFB.messages.setDesktopSize(this._sock,
Math.floor(size.w), Math.floor(size.h),
this._screenID, this._screenFlags);
Log.Debug('Requested new desktop size: ' +
size.w + 'x' + size.h);
}
// Gets the the size of the available screen
_screenSize() {
let r = this._screen.getBoundingClientRect();
return { w: r.width, h: r.height };
}
_fixScrollbars() {
// This is a hack because Chrome screws up the calculation
// for when scrollbars are needed. So to fix it we temporarily
// toggle them off and on.
const orig = this._screen.style.overflow;
this._screen.style.overflow = 'hidden';
// Force Chrome to recalculate the layout by asking for
// an element's dimensions
this._screen.getBoundingClientRect();
this._screen.style.overflow = orig;
}
/*
* Connection states:
* connecting
* connected
* disconnecting
* disconnected - permanent state
*/
_updateConnectionState(state) {
const oldstate = this._rfbConnectionState;
if (state === oldstate) {
Log.Debug("Already in state '" + state + "', ignoring");
return;
}
// The 'disconnected' state is permanent for each RFB object
if (oldstate === 'disconnected') {
Log.Error("Tried changing state of a disconnected RFB object");
return;
}
// Ensure proper transitions before doing anything
switch (state) {
case 'connected':
if (oldstate !== 'connecting') {
Log.Error("Bad transition to connected state, " +
"previous connection state: " + oldstate);
return;
}
break;
case 'disconnected':
if (oldstate !== 'disconnecting') {
Log.Error("Bad transition to disconnected state, " +
"previous connection state: " + oldstate);
return;
}
break;
case 'connecting':
if (oldstate !== '') {
Log.Error("Bad transition to connecting state, " +
"previous connection state: " + oldstate);
return;
}
break;
case 'disconnecting':
if (oldstate !== 'connected' && oldstate !== 'connecting') {
Log.Error("Bad transition to disconnecting state, " +
"previous connection state: " + oldstate);
return;
}
break;
default:
Log.Error("Unknown connection state: " + state);
return;
}
// State change actions
this._rfbConnectionState = state;
Log.Debug("New state '" + state + "', was '" + oldstate + "'.");
if (this._disconnTimer && state !== 'disconnecting') {
Log.Debug("Clearing disconnect timer");
clearTimeout(this._disconnTimer);
this._disconnTimer = null;
// make sure we don't get a double event
this._sock.off('close');
}
switch (state) {
case 'connecting':
this._connect();
break;
case 'connected':
this.dispatchEvent(new CustomEvent("connect", { detail: {} }));
break;
case 'disconnecting':
this._disconnect();
this._disconnTimer = setTimeout(() => {
Log.Error("Disconnection timed out.");
this._updateConnectionState('disconnected');
}, DISCONNECT_TIMEOUT * 1000);
break;
case 'disconnected':
this.dispatchEvent(new CustomEvent(
"disconnect", { detail:
{ clean: this._rfbCleanDisconnect } }));
break;
}
}
/* Print errors and disconnect
*
* The parameter 'details' is used for information that
* should be logged but not sent to the user interface.
*/
_fail(details) {
switch (this._rfbConnectionState) {
case 'disconnecting':
Log.Error("Failed when disconnecting: " + details);
break;
case 'connected':
Log.Error("Failed while connected: " + details);
break;
case 'connecting':
Log.Error("Failed when connecting: " + details);
break;
default:
Log.Error("RFB failure: " + details);
break;
}
this._rfbCleanDisconnect = false; //This is sent to the UI
// Transition to disconnected without waiting for socket to close
this._updateConnectionState('disconnecting');
this._updateConnectionState('disconnected');
return false;
}
_setCapability(cap, val) {
this._capabilities[cap] = val;
this.dispatchEvent(new CustomEvent("capabilities",
{ detail: { capabilities: this._capabilities } }));
}
_handleMessage() {
if (this._sock.rQlen === 0) {
Log.Warn("handleMessage called on an empty receive queue");
return;
}
switch (this._rfbConnectionState) {
case 'disconnected':
Log.Error("Got data while disconnected");
break;
case 'connected':
while (true) {
if (this._flushing) {
break;
}
if (!this._normalMsg()) {
break;
}
if (this._sock.rQlen === 0) {
break;
}
}
break;
default:
this._initMsg();
break;
}
}
_handleKeyEvent(keysym, code, down) {
this.sendKey(keysym, code, down);
}
_handleMouse(ev) {
/*
* We don't check connection status or viewOnly here as the
* mouse events might be used to control the viewport
*/
if (ev.type === 'click') {
/*
* Note: This is only needed for the 'click' event as it fails
* to fire properly for the target element so we have
* to listen on the document element instead.
*/
if (ev.target !== this._canvas) {
return;
}
}
// FIXME: if we're in view-only and not dragging,
// should we stop events?
ev.stopPropagation();
ev.preventDefault();
if ((ev.type === 'click') || (ev.type === 'contextmenu')) {
return;
}
let pos = clientToElement(ev.clientX, ev.clientY,
this._canvas);
switch (ev.type) {
case 'mousedown':
setCapture(this._canvas);
this._handleMouseButton(pos.x, pos.y,
true, 1 << ev.button);
break;
case 'mouseup':
this._handleMouseButton(pos.x, pos.y,
false, 1 << ev.button);
break;
case 'mousemove':
this._handleMouseMove(pos.x, pos.y);
break;
}
}
_handleMouseButton(x, y, down, bmask) {
if (this.dragViewport) {
if (down && !this._viewportDragging) {
this._viewportDragging = true;
this._viewportDragPos = {'x': x, 'y': y};
this._viewportHasMoved = false;
// Skip sending mouse events
return;
} else {
this._viewportDragging = false;
// If we actually performed a drag then we are done
// here and should not send any mouse events
if (this._viewportHasMoved) {
return;
}
// Otherwise we treat this as a mouse click event.
// Send the button down event here, as the button up
// event is sent at the end of this function.
this._sendMouse(x, y, bmask);
}
}
// Flush waiting move event first
if (this._mouseMoveTimer !== null) {
clearTimeout(this._mouseMoveTimer);
this._mouseMoveTimer = null;
this._sendMouse(x, y, this._mouseButtonMask);
}
if (down) {
this._mouseButtonMask |= bmask;
} else {
this._mouseButtonMask &= ~bmask;
}
this._sendMouse(x, y, this._mouseButtonMask);
}
_handleMouseMove(x, y) {
if (this._viewportDragging) {
const deltaX = this._viewportDragPos.x - x;
const deltaY = this._viewportDragPos.y - y;
if (this._viewportHasMoved || (Math.abs(deltaX) > dragThreshold ||
Math.abs(deltaY) > dragThreshold)) {
this._viewportHasMoved = true;
this._viewportDragPos = {'x': x, 'y': y};
this._display.viewportChangePos(deltaX, deltaY);
}
// Skip sending mouse events
return;
}
this._mousePos = { 'x': x, 'y': y };
// Limit many mouse move events to one every MOUSE_MOVE_DELAY ms
if (this._mouseMoveTimer == null) {
const timeSinceLastMove = Date.now() - this._mouseLastMoveTime;
if (timeSinceLastMove > MOUSE_MOVE_DELAY) {
this._sendMouse(x, y, this._mouseButtonMask);
this._mouseLastMoveTime = Date.now();
} else {
// Too soon since the latest move, wait the remaining time
this._mouseMoveTimer = setTimeout(() => {
this._handleDelayedMouseMove();
}, MOUSE_MOVE_DELAY - timeSinceLastMove);
}
}
}
_handleDelayedMouseMove() {
this._mouseMoveTimer = null;
this._sendMouse(this._mousePos.x, this._mousePos.y,
this._mouseButtonMask);
this._mouseLastMoveTime = Date.now();
}
_sendMouse(x, y, mask) {
if (this._rfbConnectionState !== 'connected') { return; }
if (this._viewOnly) { return; } // View only, skip mouse events
RFB.messages.pointerEvent(this._sock, this._display.absX(x),
this._display.absY(y), mask);
}
_handleWheel(ev) {
if (this._rfbConnectionState !== 'connected') { return; }
if (this._viewOnly) { return; } // View only, skip mouse events
ev.stopPropagation();
ev.preventDefault();
let pos = clientToElement(ev.clientX, ev.clientY,
this._canvas);
let dX = ev.deltaX;
let dY = ev.deltaY;
// Pixel units unless it's non-zero.
// Note that if deltamode is line or page won't matter since we aren't
// sending the mouse wheel delta to the server anyway.
// The difference between pixel and line can be important however since
// we have a threshold that can be smaller than the line height.
if (ev.deltaMode !== 0) {
dX *= WHEEL_LINE_HEIGHT;
dY *= WHEEL_LINE_HEIGHT;
}
// Mouse wheel events are sent in steps over VNC. This means that the VNC
// protocol can't handle a wheel event with specific distance or speed.
// Therefor, if we get a lot of small mouse wheel events we combine them.
this._accumulatedWheelDeltaX += dX;
this._accumulatedWheelDeltaY += dY;
// Generate a mouse wheel step event when the accumulated delta
// for one of the axes is large enough.
if (Math.abs(this._accumulatedWheelDeltaX) >= WHEEL_STEP) {
if (this._accumulatedWheelDeltaX < 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 5);
this._handleMouseButton(pos.x, pos.y, false, 1 << 5);
} else if (this._accumulatedWheelDeltaX > 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 6);
this._handleMouseButton(pos.x, pos.y, false, 1 << 6);
}
this._accumulatedWheelDeltaX = 0;
}
if (Math.abs(this._accumulatedWheelDeltaY) >= WHEEL_STEP) {
if (this._accumulatedWheelDeltaY < 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 3);
this._handleMouseButton(pos.x, pos.y, false, 1 << 3);
} else if (this._accumulatedWheelDeltaY > 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 4);
this._handleMouseButton(pos.x, pos.y, false, 1 << 4);
}
this._accumulatedWheelDeltaY = 0;
}
}
_fakeMouseMove(ev, elementX, elementY) {
this._handleMouseMove(elementX, elementY);
this._cursor.move(ev.detail.clientX, ev.detail.clientY);
}
_handleTapEvent(ev, bmask) {
let pos = clientToElement(ev.detail.clientX, ev.detail.clientY,
this._canvas);
// If the user quickly taps multiple times we assume they meant to
// hit the same spot, so slightly adjust coordinates
if ((this._gestureLastTapTime !== null) &&
((Date.now() - this._gestureLastTapTime) < DOUBLE_TAP_TIMEOUT) &&
(this._gestureFirstDoubleTapEv.detail.type === ev.detail.type)) {
let dx = this._gestureFirstDoubleTapEv.detail.clientX - ev.detail.clientX;
let dy = this._gestureFirstDoubleTapEv.detail.clientY - ev.detail.clientY;
let distance = Math.hypot(dx, dy);
if (distance < DOUBLE_TAP_THRESHOLD) {
pos = clientToElement(this._gestureFirstDoubleTapEv.detail.clientX,
this._gestureFirstDoubleTapEv.detail.clientY,
this._canvas);
} else {
this._gestureFirstDoubleTapEv = ev;
}
} else {
this._gestureFirstDoubleTapEv = ev;
}
this._gestureLastTapTime = Date.now();
this._fakeMouseMove(this._gestureFirstDoubleTapEv, pos.x, pos.y);
this._handleMouseButton(pos.x, pos.y, true, bmask);
this._handleMouseButton(pos.x, pos.y, false, bmask);
}
_handleGesture(ev) {
let magnitude;
let pos = clientToElement(ev.detail.clientX, ev.detail.clientY,
this._canvas);
switch (ev.type) {
case 'gesturestart':
switch (ev.detail.type) {
case 'onetap':
this._handleTapEvent(ev, 0x1);
break;
case 'twotap':
this._handleTapEvent(ev, 0x4);
break;
case 'threetap':
this._handleTapEvent(ev, 0x2);
break;
case 'drag':
this._fakeMouseMove(ev, pos.x, pos.y);
this._handleMouseButton(pos.x, pos.y, true, 0x1);
break;
case 'longpress':
this._fakeMouseMove(ev, pos.x, pos.y);
this._handleMouseButton(pos.x, pos.y, true, 0x4);
break;
case 'twodrag':
this._gestureLastMagnitudeX = ev.detail.magnitudeX;
this._gestureLastMagnitudeY = ev.detail.magnitudeY;
this._fakeMouseMove(ev, pos.x, pos.y);
break;
case 'pinch':
this._gestureLastMagnitudeX = Math.hypot(ev.detail.magnitudeX,
ev.detail.magnitudeY);
this._fakeMouseMove(ev, pos.x, pos.y);
break;
}
break;
case 'gesturemove':
switch (ev.detail.type) {
case 'onetap':
case 'twotap':
case 'threetap':
break;
case 'drag':
case 'longpress':
this._fakeMouseMove(ev, pos.x, pos.y);
break;
case 'twodrag':
// Always scroll in the same position.
// We don't know if the mouse was moved so we need to move it
// every update.
this._fakeMouseMove(ev, pos.x, pos.y);
while ((ev.detail.magnitudeY - this._gestureLastMagnitudeY) > GESTURE_SCRLSENS) {
this._handleMouseButton(pos.x, pos.y, true, 0x8);
this._handleMouseButton(pos.x, pos.y, false, 0x8);
this._gestureLastMagnitudeY += GESTURE_SCRLSENS;
}
while ((ev.detail.magnitudeY - this._gestureLastMagnitudeY) < -GESTURE_SCRLSENS) {
this._handleMouseButton(pos.x, pos.y, true, 0x10);
this._handleMouseButton(pos.x, pos.y, false, 0x10);
this._gestureLastMagnitudeY -= GESTURE_SCRLSENS;
}
while ((ev.detail.magnitudeX - this._gestureLastMagnitudeX) > GESTURE_SCRLSENS) {
this._handleMouseButton(pos.x, pos.y, true, 0x20);
this._handleMouseButton(pos.x, pos.y, false, 0x20);
this._gestureLastMagnitudeX += GESTURE_SCRLSENS;
}
while ((ev.detail.magnitudeX - this._gestureLastMagnitudeX) < -GESTURE_SCRLSENS) {
this._handleMouseButton(pos.x, pos.y, true, 0x40);
this._handleMouseButton(pos.x, pos.y, false, 0x40);
this._gestureLastMagnitudeX -= GESTURE_SCRLSENS;
}
break;
case 'pinch':
// Always scroll in the same position.
// We don't know if the mouse was moved so we need to move it
// every update.
this._fakeMouseMove(ev, pos.x, pos.y);
magnitude = Math.hypot(ev.detail.magnitudeX, ev.detail.magnitudeY);
if (Math.abs(magnitude - this._gestureLastMagnitudeX) > GESTURE_ZOOMSENS) {
this._handleKeyEvent(KeyTable.XK_Control_L, "ControlLeft", true);
while ((magnitude - this._gestureLastMagnitudeX) > GESTURE_ZOOMSENS) {
this._handleMouseButton(pos.x, pos.y, true, 0x8);
this._handleMouseButton(pos.x, pos.y, false, 0x8);
this._gestureLastMagnitudeX += GESTURE_ZOOMSENS;
}
while ((magnitude - this._gestureLastMagnitudeX) < -GESTURE_ZOOMSENS) {
this._handleMouseButton(pos.x, pos.y, true, 0x10);
this._handleMouseButton(pos.x, pos.y, false, 0x10);
this._gestureLastMagnitudeX -= GESTURE_ZOOMSENS;
}
}
this._handleKeyEvent(KeyTable.XK_Control_L, "ControlLeft", false);
break;
}
break;
case 'gestureend':
switch (ev.detail.type) {
case 'onetap':
case 'twotap':
case 'threetap':
case 'pinch':
case 'twodrag':
break;
case 'drag':
this._fakeMouseMove(ev, pos.x, pos.y);
this._handleMouseButton(pos.x, pos.y, false, 0x1);
break;
case 'longpress':
this._fakeMouseMove(ev, pos.x, pos.y);
this._handleMouseButton(pos.x, pos.y, false, 0x4);
break;
}
break;
}
}
// Message Handlers
_negotiateProtocolVersion() {
if (this._sock.rQwait("version", 12)) {
return false;
}
const sversion = this._sock.rQshiftStr(12).substr(4, 7);
Log.Info("Server ProtocolVersion: " + sversion);
let isRepeater = 0;
switch (sversion) {
case "000.000": // UltraVNC repeater
isRepeater = 1;
break;
case "003.003":
case "003.006": // UltraVNC
case "003.889": // Apple Remote Desktop
this._rfbVersion = 3.3;
break;
case "003.007":
this._rfbVersion = 3.7;
break;
case "003.008":
case "004.000": // Intel AMT KVM
case "004.001": // RealVNC 4.6
case "005.000": // RealVNC 5.3
this._rfbVersion = 3.8;
break;
default:
return this._fail("Invalid server version " + sversion);
}
if (isRepeater) {
let repeaterID = "ID:" + this._repeaterID;
while (repeaterID.length < 250) {
repeaterID += "\0";
}
this._sock.sendString(repeaterID);
return true;
}
if (this._rfbVersion > this._rfbMaxVersion) {
this._rfbVersion = this._rfbMaxVersion;
}
const cversion = "00" + parseInt(this._rfbVersion, 10) +
".00" + ((this._rfbVersion * 10) % 10);
this._sock.sendString("RFB " + cversion + "\n");
Log.Debug('Sent ProtocolVersion: ' + cversion);
this._rfbInitState = 'Security';
}
_negotiateSecurity() {
if (this._rfbVersion >= 3.7) {
// Server sends supported list, client decides
const numTypes = this._sock.rQshift8();
if (this._sock.rQwait("security type", numTypes, 1)) { return false; }
if (numTypes === 0) {
this._rfbInitState = "SecurityReason";
this._securityContext = "no security types";
this._securityStatus = 1;
return this._initMsg();
}
const types = this._sock.rQshiftBytes(numTypes);
Log.Debug("Server security types: " + types);
// Look for each auth in preferred order
if (types.includes(1)) {
this._rfbAuthScheme = 1; // None
} else if (types.includes(22)) {
this._rfbAuthScheme = 22; // XVP
} else if (types.includes(16)) {
this._rfbAuthScheme = 16; // Tight
} else if (types.includes(2)) {
this._rfbAuthScheme = 2; // VNC Auth
} else if (types.includes(19)) {
this._rfbAuthScheme = 19; // VeNCrypt Auth
} else {
return this._fail("Unsupported security types (types: " + types + ")");
}
this._sock.send([this._rfbAuthScheme]);
} else {
// Server decides
if (this._sock.rQwait("security scheme", 4)) { return false; }
this._rfbAuthScheme = this._sock.rQshift32();
if (this._rfbAuthScheme == 0) {
this._rfbInitState = "SecurityReason";
this._securityContext = "authentication scheme";
this._securityStatus = 1;
return this._initMsg();
}
}
this._rfbInitState = 'Authentication';
Log.Debug('Authenticating using scheme: ' + this._rfbAuthScheme);
return this._initMsg(); // jump to authentication
}
_handleSecurityReason() {
if (this._sock.rQwait("reason length", 4)) {
return false;
}
const strlen = this._sock.rQshift32();
let reason = "";
if (strlen > 0) {
if (this._sock.rQwait("reason", strlen, 4)) { return false; }
reason = this._sock.rQshiftStr(strlen);
}
if (reason !== "") {
this.dispatchEvent(new CustomEvent(
"securityfailure",
{ detail: { status: this._securityStatus,
reason: reason } }));
return this._fail("Security negotiation failed on " +
this._securityContext +
" (reason: " + reason + ")");
} else {
this.dispatchEvent(new CustomEvent(
"securityfailure",
{ detail: { status: this._securityStatus } }));
return this._fail("Security negotiation failed on " +
this._securityContext);
}
}
// authentication
_negotiateXvpAuth() {
if (this._rfbCredentials.username === undefined ||
this._rfbCredentials.password === undefined ||
this._rfbCredentials.target === undefined) {
this.dispatchEvent(new CustomEvent(
"credentialsrequired",
{ detail: { types: ["username", "password", "target"] } }));
return false;
}
const xvpAuthStr = String.fromCharCode(this._rfbCredentials.username.length) +
String.fromCharCode(this._rfbCredentials.target.length) +
this._rfbCredentials.username +
this._rfbCredentials.target;
this._sock.sendString(xvpAuthStr);
this._rfbAuthScheme = 2;
return this._negotiateAuthentication();
}
// VeNCrypt authentication, currently only supports version 0.2 and only Plain subtype
_negotiateVeNCryptAuth() {
// waiting for VeNCrypt version
if (this._rfbVeNCryptState == 0) {
if (this._sock.rQwait("vencrypt version", 2)) { return false; }
const major = this._sock.rQshift8();
const minor = this._sock.rQshift8();
if (!(major == 0 && minor == 2)) {
return this._fail("Unsupported VeNCrypt version " + major + "." + minor);
}
this._sock.send([0, 2]);
this._rfbVeNCryptState = 1;
}
// waiting for ACK
if (this._rfbVeNCryptState == 1) {
if (this._sock.rQwait("vencrypt ack", 1)) { return false; }
const res = this._sock.rQshift8();
if (res != 0) {
return this._fail("VeNCrypt failure " + res);
}
this._rfbVeNCryptState = 2;
}
// must fall through here (i.e. no "else if"), beacause we may have already received
// the subtypes length and won't be called again
if (this._rfbVeNCryptState == 2) { // waiting for subtypes length
if (this._sock.rQwait("vencrypt subtypes length", 1)) { return false; }
const subtypesLength = this._sock.rQshift8();
if (subtypesLength < 1) {
return this._fail("VeNCrypt subtypes empty");
}
this._rfbVeNCryptSubtypesLength = subtypesLength;
this._rfbVeNCryptState = 3;
}
// waiting for subtypes list
if (this._rfbVeNCryptState == 3) {
if (this._sock.rQwait("vencrypt subtypes", 4 * this._rfbVeNCryptSubtypesLength)) { return false; }
const subtypes = [];
for (let i = 0; i < this._rfbVeNCryptSubtypesLength; i++) {
subtypes.push(this._sock.rQshift32());
}
// 256 = Plain subtype
if (subtypes.indexOf(256) != -1) {
// 0x100 = 256
this._sock.send([0, 0, 1, 0]);
this._rfbVeNCryptState = 4;
} else {
return this._fail("VeNCrypt Plain subtype not offered by server");
}
}
// negotiated Plain subtype, server waits for password
if (this._rfbVeNCryptState == 4) {
if (this._rfbCredentials.username === undefined ||
this._rfbCredentials.password === undefined) {
this.dispatchEvent(new CustomEvent(
"credentialsrequired",
{ detail: { types: ["username", "password"] } }));
return false;
}
const user = encodeUTF8(this._rfbCredentials.username);
const pass = encodeUTF8(this._rfbCredentials.password);
this._sock.send([
(user.length >> 24) & 0xFF,
(user.length >> 16) & 0xFF,
(user.length >> 8) & 0xFF,
user.length & 0xFF
]);
this._sock.send([
(pass.length >> 24) & 0xFF,
(pass.length >> 16) & 0xFF,
(pass.length >> 8) & 0xFF,
pass.length & 0xFF
]);
this._sock.sendString(user);
this._sock.sendString(pass);
this._rfbInitState = "SecurityResult";
return true;
}
}
_negotiateStdVNCAuth() {
if (this._sock.rQwait("auth challenge", 16)) { return false; }
if (this._rfbCredentials.password === undefined) {
this.dispatchEvent(new CustomEvent(
"credentialsrequired",
{ detail: { types: ["password"] } }));
return false;
}
// TODO(directxman12): make genDES not require an Array
const challenge = Array.prototype.slice.call(this._sock.rQshiftBytes(16));
const response = RFB.genDES(this._rfbCredentials.password, challenge);
this._sock.send(response);
this._rfbInitState = "SecurityResult";
return true;
}
_negotiateTightUnixAuth() {
if (this._rfbCredentials.username === undefined ||
this._rfbCredentials.password === undefined) {
this.dispatchEvent(new CustomEvent(
"credentialsrequired",
{ detail: { types: ["username", "password"] } }));
return false;
}
this._sock.send([0, 0, 0, this._rfbCredentials.username.length]);
this._sock.send([0, 0, 0, this._rfbCredentials.password.length]);
this._sock.sendString(this._rfbCredentials.username);
this._sock.sendString(this._rfbCredentials.password);
this._rfbInitState = "SecurityResult";
return true;
}
_negotiateTightTunnels(numTunnels) {
const clientSupportedTunnelTypes = {
0: { vendor: 'TGHT', signature: 'NOTUNNEL' }
};
const serverSupportedTunnelTypes = {};
// receive tunnel capabilities
for (let i = 0; i < numTunnels; i++) {
const capCode = this._sock.rQshift32();
const capVendor = this._sock.rQshiftStr(4);
const capSignature = this._sock.rQshiftStr(8);
serverSupportedTunnelTypes[capCode] = { vendor: capVendor, signature: capSignature };
}
Log.Debug("Server Tight tunnel types: " + serverSupportedTunnelTypes);
// Siemens touch panels have a VNC server that supports NOTUNNEL,
// but forgets to advertise it. Try to detect such servers by
// looking for their custom tunnel type.
if (serverSupportedTunnelTypes[1] &&
(serverSupportedTunnelTypes[1].vendor === "SICR") &&
(serverSupportedTunnelTypes[1].signature === "SCHANNEL")) {
Log.Debug("Detected Siemens server. Assuming NOTUNNEL support.");
serverSupportedTunnelTypes[0] = { vendor: 'TGHT', signature: 'NOTUNNEL' };
}
// choose the notunnel type
if (serverSupportedTunnelTypes[0]) {
if (serverSupportedTunnelTypes[0].vendor != clientSupportedTunnelTypes[0].vendor ||
serverSupportedTunnelTypes[0].signature != clientSupportedTunnelTypes[0].signature) {
return this._fail("Client's tunnel type had the incorrect " +
"vendor or signature");
}
Log.Debug("Selected tunnel type: " + clientSupportedTunnelTypes[0]);
this._sock.send([0, 0, 0, 0]); // use NOTUNNEL
return false; // wait until we receive the sub auth count to continue
} else {
return this._fail("Server wanted tunnels, but doesn't support " +
"the notunnel type");
}
}
_negotiateTightAuth() {
if (!this._rfbTightVNC) { // first pass, do the tunnel negotiation
if (this._sock.rQwait("num tunnels", 4)) { return false; }
const numTunnels = this._sock.rQshift32();
if (numTunnels > 0 && this._sock.rQwait("tunnel capabilities", 16 * numTunnels, 4)) { return false; }
this._rfbTightVNC = true;
if (numTunnels > 0) {
this._negotiateTightTunnels(numTunnels);
return false; // wait until we receive the sub auth to continue
}
}
// second pass, do the sub-auth negotiation
if (this._sock.rQwait("sub auth count", 4)) { return false; }
const subAuthCount = this._sock.rQshift32();
if (subAuthCount === 0) { // empty sub-auth list received means 'no auth' subtype selected
this._rfbInitState = 'SecurityResult';
return true;
}
if (this._sock.rQwait("sub auth capabilities", 16 * subAuthCount, 4)) { return false; }
const clientSupportedTypes = {
'STDVNOAUTH__': 1,
'STDVVNCAUTH_': 2,
'TGHTULGNAUTH': 129
};
const serverSupportedTypes = [];
for (let i = 0; i < subAuthCount; i++) {
this._sock.rQshift32(); // capNum
const capabilities = this._sock.rQshiftStr(12);
serverSupportedTypes.push(capabilities);
}
Log.Debug("Server Tight authentication types: " + serverSupportedTypes);
for (let authType in clientSupportedTypes) {
if (serverSupportedTypes.indexOf(authType) != -1) {
this._sock.send([0, 0, 0, clientSupportedTypes[authType]]);
Log.Debug("Selected authentication type: " + authType);
switch (authType) {
case 'STDVNOAUTH__': // no auth
this._rfbInitState = 'SecurityResult';
return true;
case 'STDVVNCAUTH_': // VNC auth
this._rfbAuthScheme = 2;
return this._initMsg();
case 'TGHTULGNAUTH': // UNIX auth
this._rfbAuthScheme = 129;
return this._initMsg();
default:
return this._fail("Unsupported tiny auth scheme " +
"(scheme: " + authType + ")");
}
}
}
return this._fail("No supported sub-auth types!");
}
_negotiateAuthentication() {
switch (this._rfbAuthScheme) {
case 1: // no auth
if (this._rfbVersion >= 3.8) {
this._rfbInitState = 'SecurityResult';
return true;
}
this._rfbInitState = 'ClientInitialisation';
return this._initMsg();
case 22: // XVP auth
return this._negotiateXvpAuth();
case 2: // VNC authentication
return this._negotiateStdVNCAuth();
case 16: // TightVNC Security Type
return this._negotiateTightAuth();
case 19: // VeNCrypt Security Type
return this._negotiateVeNCryptAuth();
case 129: // TightVNC UNIX Security Type
return this._negotiateTightUnixAuth();
default:
return this._fail("Unsupported auth scheme (scheme: " +
this._rfbAuthScheme + ")");
}
}
_handleSecurityResult() {
if (this._sock.rQwait('VNC auth response ', 4)) { return false; }
const status = this._sock.rQshift32();
if (status === 0) { // OK
this._rfbInitState = 'ClientInitialisation';
Log.Debug('Authentication OK');
return this._initMsg();
} else {
if (this._rfbVersion >= 3.8) {
this._rfbInitState = "SecurityReason";
this._securityContext = "security result";
this._securityStatus = status;
return this._initMsg();
} else {
this.dispatchEvent(new CustomEvent(
"securityfailure",
{ detail: { status: status } }));
return this._fail("Security handshake failed");
}
}
}
_negotiateServerInit() {
if (this._sock.rQwait("server initialization", 24)) { return false; }
/* Screen size */
const width = this._sock.rQshift16();
const height = this._sock.rQshift16();
/* PIXEL_FORMAT */
const bpp = this._sock.rQshift8();
const depth = this._sock.rQshift8();
const bigEndian = this._sock.rQshift8();
const trueColor = this._sock.rQshift8();
const redMax = this._sock.rQshift16();
const greenMax = this._sock.rQshift16();
const blueMax = this._sock.rQshift16();
const redShift = this._sock.rQshift8();
const greenShift = this._sock.rQshift8();
const blueShift = this._sock.rQshift8();
this._sock.rQskipBytes(3); // padding
// NB(directxman12): we don't want to call any callbacks or print messages until
// *after* we're past the point where we could backtrack
/* Connection name/title */
const nameLength = this._sock.rQshift32();
if (this._sock.rQwait('server init name', nameLength, 24)) { return false; }
let name = this._sock.rQshiftStr(nameLength);
name = decodeUTF8(name, true);
if (this._rfbTightVNC) {
if (this._sock.rQwait('TightVNC extended server init header', 8, 24 + nameLength)) { return false; }
// In TightVNC mode, ServerInit message is extended
const numServerMessages = this._sock.rQshift16();
const numClientMessages = this._sock.rQshift16();
const numEncodings = this._sock.rQshift16();
this._sock.rQskipBytes(2); // padding
const totalMessagesLength = (numServerMessages + numClientMessages + numEncodings) * 16;
if (this._sock.rQwait('TightVNC extended server init header', totalMessagesLength, 32 + nameLength)) { return false; }
// we don't actually do anything with the capability information that TIGHT sends,
// so we just skip the all of this.
// TIGHT server message capabilities
this._sock.rQskipBytes(16 * numServerMessages);
// TIGHT client message capabilities
this._sock.rQskipBytes(16 * numClientMessages);
// TIGHT encoding capabilities
this._sock.rQskipBytes(16 * numEncodings);
}
// NB(directxman12): these are down here so that we don't run them multiple times
// if we backtrack
Log.Info("Screen: " + width + "x" + height +
", bpp: " + bpp + ", depth: " + depth +
", bigEndian: " + bigEndian +
", trueColor: " + trueColor +
", redMax: " + redMax +
", greenMax: " + greenMax +
", blueMax: " + blueMax +
", redShift: " + redShift +
", greenShift: " + greenShift +
", blueShift: " + blueShift);
// we're past the point where we could backtrack, so it's safe to call this
this._setDesktopName(name);
this._resize(width, height);
if (!this._viewOnly) { this._keyboard.grab(); }
this._fbDepth = 24;
if (this._fbName === "Intel(r) AMT KVM") {
Log.Warn("Intel AMT KVM only supports 8/16 bit depths. Using low color mode.");
this._fbDepth = 8;
}
RFB.messages.pixelFormat(this._sock, this._fbDepth, true);
this._sendEncodings();
RFB.messages.fbUpdateRequest(this._sock, false, 0, 0, this._fbWidth, this._fbHeight);
this._updateConnectionState('connected');
return true;
}
_sendEncodings() {
const encs = [];
// In preference order
encs.push(encodings.encodingCopyRect);
// Only supported with full depth support
if (this._fbDepth == 24) {
encs.push(encodings.encodingTight);
encs.push(encodings.encodingTightPNG);
encs.push(encodings.encodingHextile);
encs.push(encodings.encodingRRE);
}
encs.push(encodings.encodingRaw);
// Psuedo-encoding settings
encs.push(encodings.pseudoEncodingQualityLevel0 + this._qualityLevel);
encs.push(encodings.pseudoEncodingCompressLevel0 + this._compressionLevel);
encs.push(encodings.pseudoEncodingDesktopSize);
encs.push(encodings.pseudoEncodingLastRect);
encs.push(encodings.pseudoEncodingQEMUExtendedKeyEvent);
encs.push(encodings.pseudoEncodingExtendedDesktopSize);
encs.push(encodings.pseudoEncodingXvp);
encs.push(encodings.pseudoEncodingFence);
encs.push(encodings.pseudoEncodingContinuousUpdates);
encs.push(encodings.pseudoEncodingDesktopName);
encs.push(encodings.pseudoEncodingExtendedClipboard);
if (this._fbDepth == 24) {
encs.push(encodings.pseudoEncodingVMwareCursor);
encs.push(encodings.pseudoEncodingCursor);
}
RFB.messages.clientEncodings(this._sock, encs);
}
/* RFB protocol initialization states:
* ProtocolVersion
* Security
* Authentication
* SecurityResult
* ClientInitialization - not triggered by server message
* ServerInitialization
*/
_initMsg() {
switch (this._rfbInitState) {
case 'ProtocolVersion':
return this._negotiateProtocolVersion();
case 'Security':
return this._negotiateSecurity();
case 'Authentication':
return this._negotiateAuthentication();
case 'SecurityResult':
return this._handleSecurityResult();
case 'SecurityReason':
return this._handleSecurityReason();
case 'ClientInitialisation':
this._sock.send([this._shared ? 1 : 0]); // ClientInitialisation
this._rfbInitState = 'ServerInitialisation';
return true;
case 'ServerInitialisation':
return this._negotiateServerInit();
default:
return this._fail("Unknown init state (state: " +
this._rfbInitState + ")");
}
}
_handleSetColourMapMsg() {
Log.Debug("SetColorMapEntries");
return this._fail("Unexpected SetColorMapEntries message");
}
_handleServerCutText() {
Log.Debug("ServerCutText");
if (this._sock.rQwait("ServerCutText header", 7, 1)) { return false; }
this._sock.rQskipBytes(3); // Padding
let length = this._sock.rQshift32();
length = toSigned32bit(length);
if (this._sock.rQwait("ServerCutText content", Math.abs(length), 8)) { return false; }
if (length >= 0) {
//Standard msg
const text = this._sock.rQshiftStr(length);
if (this._viewOnly) {
return true;
}
this.dispatchEvent(new CustomEvent(
"clipboard",
{ detail: { text: text } }));
} else {
//Extended msg.
length = Math.abs(length);
const flags = this._sock.rQshift32();
let formats = flags & 0x0000FFFF;
let actions = flags & 0xFF000000;
let isCaps = (!!(actions & extendedClipboardActionCaps));
if (isCaps) {
this._clipboardServerCapabilitiesFormats = {};
this._clipboardServerCapabilitiesActions = {};
// Update our server capabilities for Formats
for (let i = 0; i <= 15; i++) {
let index = 1 << i;
// Check if format flag is set.
if ((formats & index)) {
this._clipboardServerCapabilitiesFormats[index] = true;
// We don't send unsolicited clipboard, so we
// ignore the size
this._sock.rQshift32();
}
}
// Update our server capabilities for Actions
for (let i = 24; i <= 31; i++) {
let index = 1 << i;
this._clipboardServerCapabilitiesActions[index] = !!(actions & index);
}
/* Caps handling done, send caps with the clients
capabilities set as a response */
let clientActions = [
extendedClipboardActionCaps,
extendedClipboardActionRequest,
extendedClipboardActionPeek,
extendedClipboardActionNotify,
extendedClipboardActionProvide
];
RFB.messages.extendedClipboardCaps(this._sock, clientActions, {extendedClipboardFormatText: 0});
} else if (actions === extendedClipboardActionRequest) {
if (this._viewOnly) {
return true;
}
// Check if server has told us it can handle Provide and there is clipboard data to send.
if (this._clipboardText != null &&
this._clipboardServerCapabilitiesActions[extendedClipboardActionProvide]) {
if (formats & extendedClipboardFormatText) {
RFB.messages.extendedClipboardProvide(this._sock, [extendedClipboardFormatText], [this._clipboardText]);
}
}
} else if (actions === extendedClipboardActionPeek) {
if (this._viewOnly) {
return true;
}
if (this._clipboardServerCapabilitiesActions[extendedClipboardActionNotify]) {
if (this._clipboardText != null) {
RFB.messages.extendedClipboardNotify(this._sock, [extendedClipboardFormatText]);
} else {
RFB.messages.extendedClipboardNotify(this._sock, []);
}
}
} else if (actions === extendedClipboardActionNotify) {
if (this._viewOnly) {
return true;
}
if (this._clipboardServerCapabilitiesActions[extendedClipboardActionRequest]) {
if (formats & extendedClipboardFormatText) {
RFB.messages.extendedClipboardRequest(this._sock, [extendedClipboardFormatText]);
}
}
} else if (actions === extendedClipboardActionProvide) {
if (this._viewOnly) {
return true;
}
if (!(formats & extendedClipboardFormatText)) {
return true;
}
// Ignore what we had in our clipboard client side.
this._clipboardText = null;
// FIXME: Should probably verify that this data was actually requested
let zlibStream = this._sock.rQshiftBytes(length - 4);
let streamInflator = new Inflator();
let textData = null;
streamInflator.setInput(zlibStream);
for (let i = 0; i <= 15; i++) {
let format = 1 << i;
if (formats & format) {
let size = 0x00;
let sizeArray = streamInflator.inflate(4);
size |= (sizeArray[0] << 24);
size |= (sizeArray[1] << 16);
size |= (sizeArray[2] << 8);
size |= (sizeArray[3]);
let chunk = streamInflator.inflate(size);
if (format === extendedClipboardFormatText) {
textData = chunk;
}
}
}
streamInflator.setInput(null);
if (textData !== null) {
let tmpText = "";
for (let i = 0; i < textData.length; i++) {
tmpText += String.fromCharCode(textData[i]);
}
textData = tmpText;
textData = decodeUTF8(textData);
if ((textData.length > 0) && "\0" === textData.charAt(textData.length - 1)) {
textData = textData.slice(0, -1);
}
textData = textData.replace("\r\n", "\n");
this.dispatchEvent(new CustomEvent(
"clipboard",
{ detail: { text: textData } }));
}
} else {
return this._fail("Unexpected action in extended clipboard message: " + actions);
}
}
return true;
}
_handleServerFenceMsg() {
if (this._sock.rQwait("ServerFence header", 8, 1)) { return false; }
this._sock.rQskipBytes(3); // Padding
let flags = this._sock.rQshift32();
let length = this._sock.rQshift8();
if (this._sock.rQwait("ServerFence payload", length, 9)) { return false; }
if (length > 64) {
Log.Warn("Bad payload length (" + length + ") in fence response");
length = 64;
}
const payload = this._sock.rQshiftStr(length);
this._supportsFence = true;
/*
* Fence flags
*
* (1<<0) - BlockBefore
* (1<<1) - BlockAfter
* (1<<2) - SyncNext
* (1<<31) - Request
*/
if (!(flags & (1<<31))) {
return this._fail("Unexpected fence response");
}
// Filter out unsupported flags
// FIXME: support syncNext
flags &= (1<<0) | (1<<1);
// BlockBefore and BlockAfter are automatically handled by
// the fact that we process each incoming message
// synchronuosly.
RFB.messages.clientFence(this._sock, flags, payload);
return true;
}
_handleXvpMsg() {
if (this._sock.rQwait("XVP version and message", 3, 1)) { return false; }
this._sock.rQskipBytes(1); // Padding
const xvpVer = this._sock.rQshift8();
const xvpMsg = this._sock.rQshift8();
switch (xvpMsg) {
case 0: // XVP_FAIL
Log.Error("XVP Operation Failed");
break;
case 1: // XVP_INIT
this._rfbXvpVer = xvpVer;
Log.Info("XVP extensions enabled (version " + this._rfbXvpVer + ")");
this._setCapability("power", true);
break;
default:
this._fail("Illegal server XVP message (msg: " + xvpMsg + ")");
break;
}
return true;
}
_normalMsg() {
let msgType;
if (this._FBU.rects > 0) {
msgType = 0;
} else {
msgType = this._sock.rQshift8();
}
let first, ret;
switch (msgType) {
case 0: // FramebufferUpdate
ret = this._framebufferUpdate();
if (ret && !this._enabledContinuousUpdates) {
RFB.messages.fbUpdateRequest(this._sock, true, 0, 0,
this._fbWidth, this._fbHeight);
}
return ret;
case 1: // SetColorMapEntries
return this._handleSetColourMapMsg();
case 2: // Bell
Log.Debug("Bell");
this.dispatchEvent(new CustomEvent(
"bell",
{ detail: {} }));
return true;
case 3: // ServerCutText
return this._handleServerCutText();
case 150: // EndOfContinuousUpdates
first = !this._supportsContinuousUpdates;
this._supportsContinuousUpdates = true;
this._enabledContinuousUpdates = false;
if (first) {
this._enabledContinuousUpdates = true;
this._updateContinuousUpdates();
Log.Info("Enabling continuous updates.");
} else {
// FIXME: We need to send a framebufferupdaterequest here
// if we add support for turning off continuous updates
}
return true;
case 248: // ServerFence
return this._handleServerFenceMsg();
case 250: // XVP
return this._handleXvpMsg();
default:
this._fail("Unexpected server message (type " + msgType + ")");
Log.Debug("sock.rQslice(0, 30): " + this._sock.rQslice(0, 30));
return true;
}
}
_onFlush() {
this._flushing = false;
// Resume processing
if (this._sock.rQlen > 0) {
this._handleMessage();
}
}
_framebufferUpdate() {
if (this._FBU.rects === 0) {
if (this._sock.rQwait("FBU header", 3, 1)) { return false; }
this._sock.rQskipBytes(1); // Padding
this._FBU.rects = this._sock.rQshift16();
// Make sure the previous frame is fully rendered first
// to avoid building up an excessive queue
if (this._display.pending()) {
this._flushing = true;
this._display.flush();
return false;
}
}
while (this._FBU.rects > 0) {
if (this._FBU.encoding === null) {
if (this._sock.rQwait("rect header", 12)) { return false; }
/* New FramebufferUpdate */
const hdr = this._sock.rQshiftBytes(12);
this._FBU.x = (hdr[0] << 8) + hdr[1];
this._FBU.y = (hdr[2] << 8) + hdr[3];
this._FBU.width = (hdr[4] << 8) + hdr[5];
this._FBU.height = (hdr[6] << 8) + hdr[7];
this._FBU.encoding = parseInt((hdr[8] << 24) + (hdr[9] << 16) +
(hdr[10] << 8) + hdr[11], 10);
}
if (!this._handleRect()) {
return false;
}
this._FBU.rects--;
this._FBU.encoding = null;
}
this._display.flip();
return true; // We finished this FBU
}
_handleRect() {
switch (this._FBU.encoding) {
case encodings.pseudoEncodingLastRect:
this._FBU.rects = 1; // Will be decreased when we return
return true;
case encodings.pseudoEncodingVMwareCursor:
return this._handleVMwareCursor();
case encodings.pseudoEncodingCursor:
return this._handleCursor();
case encodings.pseudoEncodingQEMUExtendedKeyEvent:
this._qemuExtKeyEventSupported = true;
return true;
case encodings.pseudoEncodingDesktopName:
return this._handleDesktopName();
case encodings.pseudoEncodingDesktopSize:
this._resize(this._FBU.width, this._FBU.height);
return true;
case encodings.pseudoEncodingExtendedDesktopSize:
return this._handleExtendedDesktopSize();
default:
return this._handleDataRect();
}
}
_handleVMwareCursor() {
const hotx = this._FBU.x; // hotspot-x
const hoty = this._FBU.y; // hotspot-y
const w = this._FBU.width;
const h = this._FBU.height;
if (this._sock.rQwait("VMware cursor encoding", 1)) {
return false;
}
const cursorType = this._sock.rQshift8();
this._sock.rQshift8(); //Padding
let rgba;
const bytesPerPixel = 4;
//Classic cursor
if (cursorType == 0) {
//Used to filter away unimportant bits.
//OR is used for correct conversion in js.
const PIXEL_MASK = 0xffffff00 | 0;
rgba = new Array(w * h * bytesPerPixel);
if (this._sock.rQwait("VMware cursor classic encoding",
(w * h * bytesPerPixel) * 2, 2)) {
return false;
}
let andMask = new Array(w * h);
for (let pixel = 0; pixel < (w * h); pixel++) {
andMask[pixel] = this._sock.rQshift32();
}
let xorMask = new Array(w * h);
for (let pixel = 0; pixel < (w * h); pixel++) {
xorMask[pixel] = this._sock.rQshift32();
}
for (let pixel = 0; pixel < (w * h); pixel++) {
if (andMask[pixel] == 0) {
//Fully opaque pixel
let bgr = xorMask[pixel];
let r = bgr >> 8 & 0xff;
let g = bgr >> 16 & 0xff;
let b = bgr >> 24 & 0xff;
rgba[(pixel * bytesPerPixel) ] = r; //r
rgba[(pixel * bytesPerPixel) + 1 ] = g; //g
rgba[(pixel * bytesPerPixel) + 2 ] = b; //b
rgba[(pixel * bytesPerPixel) + 3 ] = 0xff; //a
} else if ((andMask[pixel] & PIXEL_MASK) ==
PIXEL_MASK) {
//Only screen value matters, no mouse colouring
if (xorMask[pixel] == 0) {
//Transparent pixel
rgba[(pixel * bytesPerPixel) ] = 0x00;
rgba[(pixel * bytesPerPixel) + 1 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 2 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 3 ] = 0x00;
} else if ((xorMask[pixel] & PIXEL_MASK) ==
PIXEL_MASK) {
//Inverted pixel, not supported in browsers.
//Fully opaque instead.
rgba[(pixel * bytesPerPixel) ] = 0x00;
rgba[(pixel * bytesPerPixel) + 1 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 2 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 3 ] = 0xff;
} else {
//Unhandled xorMask
rgba[(pixel * bytesPerPixel) ] = 0x00;
rgba[(pixel * bytesPerPixel) + 1 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 2 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 3 ] = 0xff;
}
} else {
//Unhandled andMask
rgba[(pixel * bytesPerPixel) ] = 0x00;
rgba[(pixel * bytesPerPixel) + 1 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 2 ] = 0x00;
rgba[(pixel * bytesPerPixel) + 3 ] = 0xff;
}
}
//Alpha cursor.
} else if (cursorType == 1) {
if (this._sock.rQwait("VMware cursor alpha encoding",
(w * h * 4), 2)) {
return false;
}
rgba = new Array(w * h * bytesPerPixel);
for (let pixel = 0; pixel < (w * h); pixel++) {
let data = this._sock.rQshift32();
rgba[(pixel * 4) ] = data >> 24 & 0xff; //r
rgba[(pixel * 4) + 1 ] = data >> 16 & 0xff; //g
rgba[(pixel * 4) + 2 ] = data >> 8 & 0xff; //b
rgba[(pixel * 4) + 3 ] = data & 0xff; //a
}
} else {
Log.Warn("The given cursor type is not supported: "
+ cursorType + " given.");
return false;
}
this._updateCursor(rgba, hotx, hoty, w, h);
return true;
}
_handleCursor() {
const hotx = this._FBU.x; // hotspot-x
const hoty = this._FBU.y; // hotspot-y
const w = this._FBU.width;
const h = this._FBU.height;
const pixelslength = w * h * 4;
const masklength = Math.ceil(w / 8) * h;
let bytes = pixelslength + masklength;
if (this._sock.rQwait("cursor encoding", bytes)) {
return false;
}
// Decode from BGRX pixels + bit mask to RGBA
const pixels = this._sock.rQshiftBytes(pixelslength);
const mask = this._sock.rQshiftBytes(masklength);
let rgba = new Uint8Array(w * h * 4);
let pixIdx = 0;
for (let y = 0; y < h; y++) {
for (let x = 0; x < w; x++) {
let maskIdx = y * Math.ceil(w / 8) + Math.floor(x / 8);
let alpha = (mask[maskIdx] << (x % 8)) & 0x80 ? 255 : 0;
rgba[pixIdx ] = pixels[pixIdx + 2];
rgba[pixIdx + 1] = pixels[pixIdx + 1];
rgba[pixIdx + 2] = pixels[pixIdx];
rgba[pixIdx + 3] = alpha;
pixIdx += 4;
}
}
this._updateCursor(rgba, hotx, hoty, w, h);
return true;
}
_handleDesktopName() {
if (this._sock.rQwait("DesktopName", 4)) {
return false;
}
let length = this._sock.rQshift32();
if (this._sock.rQwait("DesktopName", length, 4)) {
return false;
}
let name = this._sock.rQshiftStr(length);
name = decodeUTF8(name, true);
this._setDesktopName(name);
return true;
}
_handleExtendedDesktopSize() {
if (this._sock.rQwait("ExtendedDesktopSize", 4)) {
return false;
}
const numberOfScreens = this._sock.rQpeek8();
let bytes = 4 + (numberOfScreens * 16);
if (this._sock.rQwait("ExtendedDesktopSize", bytes)) {
return false;
}
const firstUpdate = !this._supportsSetDesktopSize;
this._supportsSetDesktopSize = true;
// Normally we only apply the current resize mode after a
// window resize event. However there is no such trigger on the
// initial connect. And we don't know if the server supports
// resizing until we've gotten here.
if (firstUpdate) {
this._requestRemoteResize();
}
this._sock.rQskipBytes(1); // number-of-screens
this._sock.rQskipBytes(3); // padding
for (let i = 0; i < numberOfScreens; i += 1) {
// Save the id and flags of the first screen
if (i === 0) {
this._screenID = this._sock.rQshiftBytes(4); // id
this._sock.rQskipBytes(2); // x-position
this._sock.rQskipBytes(2); // y-position
this._sock.rQskipBytes(2); // width
this._sock.rQskipBytes(2); // height
this._screenFlags = this._sock.rQshiftBytes(4); // flags
} else {
this._sock.rQskipBytes(16);
}
}
/*
* The x-position indicates the reason for the change:
*
* 0 - server resized on its own
* 1 - this client requested the resize
* 2 - another client requested the resize
*/
// We need to handle errors when we requested the resize.
if (this._FBU.x === 1 && this._FBU.y !== 0) {
let msg = "";
// The y-position indicates the status code from the server
switch (this._FBU.y) {
case 1:
msg = "Resize is administratively prohibited";
break;
case 2:
msg = "Out of resources";
break;
case 3:
msg = "Invalid screen layout";
break;
default:
msg = "Unknown reason";
break;
}
Log.Warn("Server did not accept the resize request: "
+ msg);
} else {
this._resize(this._FBU.width, this._FBU.height);
}
return true;
}
_handleDataRect() {
let decoder = this._decoders[this._FBU.encoding];
if (!decoder) {
this._fail("Unsupported encoding (encoding: " +
this._FBU.encoding + ")");
return false;
}
try {
return decoder.decodeRect(this._FBU.x, this._FBU.y,
this._FBU.width, this._FBU.height,
this._sock, this._display,
this._fbDepth);
} catch (err) {
this._fail("Error decoding rect: " + err);
return false;
}
}
_updateContinuousUpdates() {
if (!this._enabledContinuousUpdates) { return; }
RFB.messages.enableContinuousUpdates(this._sock, true, 0, 0,
this._fbWidth, this._fbHeight);
}
_resize(width, height) {
this._fbWidth = width;
this._fbHeight = height;
this._display.resize(this._fbWidth, this._fbHeight);
// Adjust the visible viewport based on the new dimensions
this._updateClip();
this._updateScale();
this._updateContinuousUpdates();
}
_xvpOp(ver, op) {
if (this._rfbXvpVer < ver) { return; }
Log.Info("Sending XVP operation " + op + " (version " + ver + ")");
RFB.messages.xvpOp(this._sock, ver, op);
}
_updateCursor(rgba, hotx, hoty, w, h) {
this._cursorImage = {
rgbaPixels: rgba,
hotx: hotx, hoty: hoty, w: w, h: h,
};
this._refreshCursor();
}
_shouldShowDotCursor() {
// Called when this._cursorImage is updated
if (!this._showDotCursor) {
// User does not want to see the dot, so...
return false;
}
// The dot should not be shown if the cursor is already visible,
// i.e. contains at least one not-fully-transparent pixel.
// So iterate through all alpha bytes in rgba and stop at the
// first non-zero.
for (let i = 3; i < this._cursorImage.rgbaPixels.length; i += 4) {
if (this._cursorImage.rgbaPixels[i]) {
return false;
}
}
// At this point, we know that the cursor is fully transparent, and
// the user wants to see the dot instead of this.
return true;
}
_refreshCursor() {
if (this._rfbConnectionState !== "connecting" &&
this._rfbConnectionState !== "connected") {
return;
}
const image = this._shouldShowDotCursor() ? RFB.cursors.dot : this._cursorImage;
this._cursor.change(image.rgbaPixels,
image.hotx, image.hoty,
image.w, image.h
);
}
static genDES(password, challenge) {
const passwordChars = password.split('').map(c => c.charCodeAt(0));
return (new DES(passwordChars)).encrypt(challenge);
}
}
// Class Methods
RFB.messages = {
keyEvent(sock, keysym, down) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 4; // msg-type
buff[offset + 1] = down;
buff[offset + 2] = 0;
buff[offset + 3] = 0;
buff[offset + 4] = (keysym >> 24);
buff[offset + 5] = (keysym >> 16);
buff[offset + 6] = (keysym >> 8);
buff[offset + 7] = keysym;
sock._sQlen += 8;
sock.flush();
},
QEMUExtendedKeyEvent(sock, keysym, down, keycode) {
function getRFBkeycode(xtScanCode) {
const upperByte = (keycode >> 8);
const lowerByte = (keycode & 0x00ff);
if (upperByte === 0xe0 && lowerByte < 0x7f) {
return lowerByte | 0x80;
}
return xtScanCode;
}
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 255; // msg-type
buff[offset + 1] = 0; // sub msg-type
buff[offset + 2] = (down >> 8);
buff[offset + 3] = down;
buff[offset + 4] = (keysym >> 24);
buff[offset + 5] = (keysym >> 16);
buff[offset + 6] = (keysym >> 8);
buff[offset + 7] = keysym;
const RFBkeycode = getRFBkeycode(keycode);
buff[offset + 8] = (RFBkeycode >> 24);
buff[offset + 9] = (RFBkeycode >> 16);
buff[offset + 10] = (RFBkeycode >> 8);
buff[offset + 11] = RFBkeycode;
sock._sQlen += 12;
sock.flush();
},
pointerEvent(sock, x, y, mask) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 5; // msg-type
buff[offset + 1] = mask;
buff[offset + 2] = x >> 8;
buff[offset + 3] = x;
buff[offset + 4] = y >> 8;
buff[offset + 5] = y;
sock._sQlen += 6;
sock.flush();
},
// Used to build Notify and Request data.
_buildExtendedClipboardFlags(actions, formats) {
let data = new Uint8Array(4);
let formatFlag = 0x00000000;
let actionFlag = 0x00000000;
for (let i = 0; i < actions.length; i++) {
actionFlag |= actions[i];
}
for (let i = 0; i < formats.length; i++) {
formatFlag |= formats[i];
}
data[0] = actionFlag >> 24; // Actions
data[1] = 0x00; // Reserved
data[2] = 0x00; // Reserved
data[3] = formatFlag; // Formats
return data;
},
extendedClipboardProvide(sock, formats, inData) {
// Deflate incomming data and their sizes
let deflator = new Deflator();
let dataToDeflate = [];
for (let i = 0; i < formats.length; i++) {
// We only support the format Text at this time
if (formats[i] != extendedClipboardFormatText) {
throw new Error("Unsupported extended clipboard format for Provide message.");
}
// Change lone \r or \n into \r\n as defined in rfbproto
inData[i] = inData[i].replace(/\r\n|\r|\n/gm, "\r\n");
// Check if it already has \0
let text = encodeUTF8(inData[i] + "\0");
dataToDeflate.push( (text.length >> 24) & 0xFF,
(text.length >> 16) & 0xFF,
(text.length >> 8) & 0xFF,
(text.length & 0xFF));
for (let j = 0; j < text.length; j++) {
dataToDeflate.push(text.charCodeAt(j));
}
}
let deflatedData = deflator.deflate(new Uint8Array(dataToDeflate));
// Build data to send
let data = new Uint8Array(4 + deflatedData.length);
data.set(RFB.messages._buildExtendedClipboardFlags([extendedClipboardActionProvide],
formats));
data.set(deflatedData, 4);
RFB.messages.clientCutText(sock, data, true);
},
extendedClipboardNotify(sock, formats) {
let flags = RFB.messages._buildExtendedClipboardFlags([extendedClipboardActionNotify],
formats);
RFB.messages.clientCutText(sock, flags, true);
},
extendedClipboardRequest(sock, formats) {
let flags = RFB.messages._buildExtendedClipboardFlags([extendedClipboardActionRequest],
formats);
RFB.messages.clientCutText(sock, flags, true);
},
extendedClipboardCaps(sock, actions, formats) {
let formatKeys = Object.keys(formats);
let data = new Uint8Array(4 + (4 * formatKeys.length));
formatKeys.map(x => parseInt(x));
formatKeys.sort((a, b) => a - b);
data.set(RFB.messages._buildExtendedClipboardFlags(actions, []));
let loopOffset = 4;
for (let i = 0; i < formatKeys.length; i++) {
data[loopOffset] = formats[formatKeys[i]] >> 24;
data[loopOffset + 1] = formats[formatKeys[i]] >> 16;
data[loopOffset + 2] = formats[formatKeys[i]] >> 8;
data[loopOffset + 3] = formats[formatKeys[i]] >> 0;
loopOffset += 4;
data[3] |= (1 << formatKeys[i]); // Update our format flags
}
RFB.messages.clientCutText(sock, data, true);
},
clientCutText(sock, data, extended = false) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 6; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = 0; // padding
buff[offset + 3] = 0; // padding
let length;
if (extended) {
length = toUnsigned32bit(-data.length);
} else {
length = data.length;
}
buff[offset + 4] = length >> 24;
buff[offset + 5] = length >> 16;
buff[offset + 6] = length >> 8;
buff[offset + 7] = length;
sock._sQlen += 8;
// We have to keep track of from where in the data we begin creating the
// buffer for the flush in the next iteration.
let dataOffset = 0;
let remaining = data.length;
while (remaining > 0) {
let flushSize = Math.min(remaining, (sock._sQbufferSize - sock._sQlen));
for (let i = 0; i < flushSize; i++) {
buff[sock._sQlen + i] = data[dataOffset + i];
}
sock._sQlen += flushSize;
sock.flush();
remaining -= flushSize;
dataOffset += flushSize;
}
},
setDesktopSize(sock, width, height, id, flags) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 251; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = width >> 8; // width
buff[offset + 3] = width;
buff[offset + 4] = height >> 8; // height
buff[offset + 5] = height;
buff[offset + 6] = 1; // number-of-screens
buff[offset + 7] = 0; // padding
// screen array
buff[offset + 8] = id >> 24; // id
buff[offset + 9] = id >> 16;
buff[offset + 10] = id >> 8;
buff[offset + 11] = id;
buff[offset + 12] = 0; // x-position
buff[offset + 13] = 0;
buff[offset + 14] = 0; // y-position
buff[offset + 15] = 0;
buff[offset + 16] = width >> 8; // width
buff[offset + 17] = width;
buff[offset + 18] = height >> 8; // height
buff[offset + 19] = height;
buff[offset + 20] = flags >> 24; // flags
buff[offset + 21] = flags >> 16;
buff[offset + 22] = flags >> 8;
buff[offset + 23] = flags;
sock._sQlen += 24;
sock.flush();
},
clientFence(sock, flags, payload) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 248; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = 0; // padding
buff[offset + 3] = 0; // padding
buff[offset + 4] = flags >> 24; // flags
buff[offset + 5] = flags >> 16;
buff[offset + 6] = flags >> 8;
buff[offset + 7] = flags;
const n = payload.length;
buff[offset + 8] = n; // length
for (let i = 0; i < n; i++) {
buff[offset + 9 + i] = payload.charCodeAt(i);
}
sock._sQlen += 9 + n;
sock.flush();
},
enableContinuousUpdates(sock, enable, x, y, width, height) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 150; // msg-type
buff[offset + 1] = enable; // enable-flag
buff[offset + 2] = x >> 8; // x
buff[offset + 3] = x;
buff[offset + 4] = y >> 8; // y
buff[offset + 5] = y;
buff[offset + 6] = width >> 8; // width
buff[offset + 7] = width;
buff[offset + 8] = height >> 8; // height
buff[offset + 9] = height;
sock._sQlen += 10;
sock.flush();
},
pixelFormat(sock, depth, trueColor) {
const buff = sock._sQ;
const offset = sock._sQlen;
let bpp;
if (depth > 16) {
bpp = 32;
} else if (depth > 8) {
bpp = 16;
} else {
bpp = 8;
}
const bits = Math.floor(depth/3);
buff[offset] = 0; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = 0; // padding
buff[offset + 3] = 0; // padding
buff[offset + 4] = bpp; // bits-per-pixel
buff[offset + 5] = depth; // depth
buff[offset + 6] = 0; // little-endian
buff[offset + 7] = trueColor ? 1 : 0; // true-color
buff[offset + 8] = 0; // red-max
buff[offset + 9] = (1 << bits) - 1; // red-max
buff[offset + 10] = 0; // green-max
buff[offset + 11] = (1 << bits) - 1; // green-max
buff[offset + 12] = 0; // blue-max
buff[offset + 13] = (1 << bits) - 1; // blue-max
buff[offset + 14] = bits * 0; // red-shift
buff[offset + 15] = bits * 1; // green-shift
buff[offset + 16] = bits * 2; // blue-shift
buff[offset + 17] = 0; // padding
buff[offset + 18] = 0; // padding
buff[offset + 19] = 0; // padding
sock._sQlen += 20;
sock.flush();
},
clientEncodings(sock, encodings) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 2; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = encodings.length >> 8;
buff[offset + 3] = encodings.length;
let j = offset + 4;
for (let i = 0; i < encodings.length; i++) {
const enc = encodings[i];
buff[j] = enc >> 24;
buff[j + 1] = enc >> 16;
buff[j + 2] = enc >> 8;
buff[j + 3] = enc;
j += 4;
}
sock._sQlen += j - offset;
sock.flush();
},
fbUpdateRequest(sock, incremental, x, y, w, h) {
const buff = sock._sQ;
const offset = sock._sQlen;
if (typeof(x) === "undefined") { x = 0; }
if (typeof(y) === "undefined") { y = 0; }
buff[offset] = 3; // msg-type
buff[offset + 1] = incremental ? 1 : 0;
buff[offset + 2] = (x >> 8) & 0xFF;
buff[offset + 3] = x & 0xFF;
buff[offset + 4] = (y >> 8) & 0xFF;
buff[offset + 5] = y & 0xFF;
buff[offset + 6] = (w >> 8) & 0xFF;
buff[offset + 7] = w & 0xFF;
buff[offset + 8] = (h >> 8) & 0xFF;
buff[offset + 9] = h & 0xFF;
sock._sQlen += 10;
sock.flush();
},
xvpOp(sock, ver, op) {
const buff = sock._sQ;
const offset = sock._sQlen;
buff[offset] = 250; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = ver;
buff[offset + 3] = op;
sock._sQlen += 4;
sock.flush();
}
};
RFB.cursors = {
none: {
rgbaPixels: new Uint8Array(),
w: 0, h: 0,
hotx: 0, hoty: 0,
},
dot: {
/* eslint-disable indent */
rgbaPixels: new Uint8Array([
255, 255, 255, 255, 0, 0, 0, 255, 255, 255, 255, 255,
0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 255,
255, 255, 255, 255, 0, 0, 0, 255, 255, 255, 255, 255,
]),
/* eslint-enable indent */
w: 3, h: 3,
hotx: 1, hoty: 1,
}
};