GitHub/noVNC
1
0
Fork 0
mirror of https://github.com/novnc/noVNC.git synced 2026-05-30 00:49:38 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
d472f3f19ef8cb9000ccfdf854d9f40e587fac0a
noVNC/core/rfb.js
Samuel Mannehed d472f3f19e Abstract RFB errors to avoid sending strings 
The API allowed strings to be passed from the RFB module to the
application using the disconnect reason. This caused problems since
the application didn't have control over translations for these
strings.

Most of the information being passed using this string was very
technical and not helpful to the end user. One exception to this was
the security result information regarding for example authentication
failures. The protocol allows the VNC server to pass a string
directly to the user in the security result.

So the disconnect reason is replaced by a boolean saying if the
disconnection was clean or not. And for the security result information
from the server, a new event has been added.
2017-11-14 15:36:12 +01:00

2409 lines
82 KiB
JavaScript
Raw Blame History

/*
* noVNC: HTML5 VNC client
* Copyright (C) 2012 Joel Martin
* Copyright (C) 2017 Samuel Mannehed for Cendio AB
* Licensed under MPL 2.0 (see LICENSE.txt)
*
* See README.md for usage and integration instructions.
*
* TIGHT decoder portion:
* (c) 2012 Michael Tinglof, Joe Balaz, Les Piech (Mercuri.ca)
*/
import * as Log from './util/logging.js';
import { decodeUTF8 } from './util/strings.js';
import { browserSupportsCursorURIs, isTouchDevice } from './util/browsers.js';
import EventTargetMixin from './util/eventtarget.js';
import Display from "./display.js";
import Keyboard from "./input/keyboard.js";
import Mouse from "./input/mouse.js";
import Websock from "./websock.js";
import Base64 from "./base64.js";
import DES from "./des.js";
import KeyTable from "./input/keysym.js";
import XtScancode from "./input/xtscancodes.js";
import Inflator from "./inflator.js";
import { encodings, encodingName } from "./encodings.js";
import "./util/polyfill.js";
/*jslint white: false, browser: true */
/*global window, Util, Display, Keyboard, Mouse, Websock, Websock_native, Base64, DES, KeyTable, Inflator, XtScancode */
// How many seconds to wait for a disconnect to finish
var DISCONNECT_TIMEOUT = 3;
export default function RFB(target, url, options) {
if (!target) {
throw Error("Must specify target");
}
if (!url) {
throw Error("Must specify URL");
}
this._target = target;
this._url = url;
// Connection details
options = options || {};
this._rfb_credentials = options.credentials || {};
this._shared = 'shared' in options ? !!options.shared : true;
this._repeaterID = options.repeaterID || '';
// Internal state
this._rfb_connection_state = '';
this._rfb_init_state = '';
this._rfb_auth_scheme = '';
this._rfb_clean_disconnect = true;
// Server capabilities
this._rfb_version = 0;
this._rfb_max_version = 3.8;
this._rfb_tightvnc = false;
this._rfb_xvp_ver = 0;
this._fb_width = 0;
this._fb_height = 0;
this._fb_name = "";
this._capabilities = { power: false, resize: false };
this._supportsFence = false;
this._supportsContinuousUpdates = false;
this._enabledContinuousUpdates = false;
this._supportsSetDesktopSize = false;
this._screen_id = 0;
this._screen_flags = 0;
this._qemuExtKeyEventSupported = false;
// 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._mouse = null; // Mouse input handler object
// Timers
this._disconnTimer = null; // disconnection timer
// Decoder states and stats
this._encHandlers = {};
this._encStats = {};
this._FBU = {
rects: 0,
subrects: 0, // RRE and HEXTILE
lines: 0, // RAW
tiles: 0, // HEXTILE
bytes: 0,
x: 0,
y: 0,
width: 0,
height: 0,
encoding: 0,
subencoding: -1,
background: null,
zlibs: [] // TIGHT zlib streams
};
for (var i = 0; i < 4; i++) {
this._FBU.zlibs[i] = new Inflator();
}
this._destBuff = null;
this._paletteBuff = new Uint8Array(1024); // 256 * 4 (max palette size * max bytes-per-pixel)
this._rre_chunk_sz = 100;
this._timing = {
last_fbu: 0,
fbu_total: 0,
fbu_total_cnt: 0,
full_fbu_total: 0,
full_fbu_cnt: 0,
fbu_rt_start: 0,
fbu_rt_total: 0,
fbu_rt_cnt: 0,
pixels: 0
};
// Mouse state
this._mouse_buttonMask = 0;
this._mouse_arr = [];
this._viewportDragging = false;
this._viewportDragPos = {};
this._viewportHasMoved = false;
// Bound event handlers
this._eventHandlers = {
focusCanvas: this._focusCanvas.bind(this),
};
// main setup
Log.Debug(">> RFB.constructor");
// Target canvas must be able to have focus
if (!this._target.hasAttribute('tabindex')) {
this._target.tabIndex = -1;
}
// populate encHandlers with bound versions
this._encHandlers[encodings.encodingRaw] = RFB.encodingHandlers.RAW.bind(this);
this._encHandlers[encodings.encodingCopyRect] = RFB.encodingHandlers.COPYRECT.bind(this);
this._encHandlers[encodings.encodingRRE] = RFB.encodingHandlers.RRE.bind(this);
this._encHandlers[encodings.encodingHextile] = RFB.encodingHandlers.HEXTILE.bind(this);
this._encHandlers[encodings.encodingTight] = RFB.encodingHandlers.TIGHT.bind(this);
this._encHandlers[encodings.pseudoEncodingDesktopSize] = RFB.encodingHandlers.DesktopSize.bind(this);
this._encHandlers[encodings.pseudoEncodingLastRect] = RFB.encodingHandlers.last_rect.bind(this);
this._encHandlers[encodings.pseudoEncodingCursor] = RFB.encodingHandlers.Cursor.bind(this);
this._encHandlers[encodings.pseudoEncodingQEMUExtendedKeyEvent] = RFB.encodingHandlers.QEMUExtendedKeyEvent.bind(this);
this._encHandlers[encodings.pseudoEncodingExtendedDesktopSize] = RFB.encodingHandlers.ExtendedDesktopSize.bind(this);
// NB: nothing that needs explicit teardown should be done
// before this point, since this can throw an exception
try {
this._display = new Display(this._target);
} catch (exc) {
Log.Error("Display exception: " + exc);
throw exc;
}
this._display.onflush = this._onFlush.bind(this);
this._display.clear();
this._keyboard = new Keyboard(this._target);
this._keyboard.onkeyevent = this._handleKeyEvent.bind(this);
this._mouse = new Mouse(this._target);
this._mouse.onmousebutton = this._handleMouseButton.bind(this);
this._mouse.onmousemove = this._handleMouseMove.bind(this);
this._sock = new Websock();
this._sock.on('message', this._handle_message.bind(this));
this._sock.on('open', function () {
if ((this._rfb_connection_state === 'connecting') &&
(this._rfb_init_state === '')) {
this._rfb_init_state = 'ProtocolVersion';
Log.Debug("Starting VNC handshake");
} else {
this._fail("Unexpected server connection while " +
this._rfb_connection_state);
}
}.bind(this));
this._sock.on('close', function (e) {
Log.Warn("WebSocket on-close event");
var msg = "";
if (e.code) {
msg = "(code: " + e.code;
if (e.reason) {
msg += ", reason: " + e.reason;
}
msg += ")";
}
switch (this._rfb_connection_state) {
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');
}.bind(this));
this._sock.on('error', function (e) {
Log.Warn("WebSocket on-error event");
});
// Slight delay of the actual connection so that the caller has
// time to set up callbacks
setTimeout(this._updateConnectionState.bind(this, 'connecting'));
Log.Debug("<< RFB.constructor");
};
RFB.prototype = {
// ===== PROPERTIES =====
dragViewport: false,
focusOnClick: true,
_viewOnly: false,
get viewOnly() { return this._viewOnly; },
set viewOnly(viewOnly) {
this._viewOnly = viewOnly;
if (this._rfb_connection_state === "connecting" ||
this._rfb_connection_state === "connected") {
if (viewOnly) {
this._keyboard.ungrab();
this._mouse.ungrab();
} else {
this._keyboard.grab();
this._mouse.grab();
}
}
},
get capabilities() { return this._capabilities; },
get touchButton() { return this._mouse.touchButton; },
set touchButton(button) { this._mouse.touchButton = button; },
get viewportScale() { return this._display.scale; },
set viewportScale(scale) { this._display.scale = scale; },
get clipViewport() { return this._display.clipViewport; },
set clipViewport(viewport) { this._display.clipViewport = viewport; },
get isClipped() { return this._display.isClipped; },
// ===== PUBLIC METHODS =====
disconnect: function () {
this._updateConnectionState('disconnecting');
this._sock.off('error');
this._sock.off('message');
this._sock.off('open');
},
sendCredentials: function (creds) {
this._rfb_credentials = creds;
setTimeout(this._init_msg.bind(this), 0);
},
sendCtrlAltDel: function () {
if (this._rfb_connection_state !== '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: function () {
this._xvpOp(1, 2);
},
machineReboot: function () {
this._xvpOp(1, 3);
},
machineReset: function () {
this._xvpOp(1, 4);
},
// Send a key press. If 'down' is not specified then send a down key
// followed by an up key.
sendKey: function (keysym, code, down) {
if (this._rfb_connection_state !== 'connected' || this._viewOnly) { return; }
if (down === undefined) {
this.sendKey(keysym, code, true);
this.sendKey(keysym, code, false);
return;
}
var 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);
}
},
clipboardPasteFrom: function (text) {
if (this._rfb_connection_state !== 'connected' || this._viewOnly) { return; }
RFB.messages.clientCutText(this._sock, text);
},
autoscale: function (width, height) {
if (this._rfb_connection_state !== 'connected') { return; }
this._display.autoscale(width, height);
},
viewportChangeSize: function(width, height) {
if (this._rfb_connection_state !== 'connected') { return; }
this._display.viewportChangeSize(width, height);
},
// Requests a change of remote desktop size. This message is an extension
// and may only be sent if we have received an ExtendedDesktopSize message
requestDesktopSize: function (width, height) {
if (this._rfb_connection_state !== 'connected' ||
this._viewOnly) {
return;
}
if (!this._supportsSetDesktopSize) {
return;
}
RFB.messages.setDesktopSize(this._sock, width, height,
this._screen_id, this._screen_flags);
},
// ===== PRIVATE METHODS =====
_connect: function () {
Log.Debug(">> RFB.connect");
Log.Info("connecting to " + this._url);
try {
// WebSocket.onopen transitions to the RFB init states
this._sock.open(this._url, ['binary']);
} catch (e) {
if (e.name === 'SyntaxError') {
this._fail("Invalid host or port (" + e + ")");
} else {
this._fail("Error when opening socket (" + e + ")");
}
}
// Always grab focus on some kind of click event
this._target.addEventListener("mousedown", this._eventHandlers.focusCanvas);
this._target.addEventListener("touchstart", this._eventHandlers.focusCanvas);
Log.Debug("<< RFB.connect");
},
_disconnect: function () {
Log.Debug(">> RFB.disconnect");
this._target.removeEventListener("mousedown", this._eventHandlers.focusCanvas);
this._target.removeEventListener("touchstart", this._eventHandlers.focusCanvas);
this._cleanup();
this._sock.close();
this._print_stats();
Log.Debug("<< RFB.disconnect");
},
_print_stats: function () {
var stats = this._encStats;
Log.Info("Encoding stats for this connection:");
Object.keys(stats).forEach(function (key) {
var s = stats[key];
if (s[0] + s[1] > 0) {
Log.Info(" " + encodingName(key) + ": " + s[0] + " rects");
}
});
Log.Info("Encoding stats since page load:");
Object.keys(stats).forEach(function (key) {
var s = stats[key];
Log.Info(" " + encodingName(key) + ": " + s[1] + " rects");
});
},
_cleanup: function () {
if (!this._viewOnly) { this._keyboard.ungrab(); }
if (!this._viewOnly) { this._mouse.ungrab(); }
this._display.defaultCursor();
if (Log.get_logging() !== 'debug') {
// Show noVNC logo when disconnected, unless in
// debug mode
this._display.clear();
}
},
_focusCanvas: function(event) {
// Respect earlier handlers' request to not do side-effects
if (event.defaultPrevented) {
return;
}
if (!this._focus_on_click) {
return;
}
this._target.focus();
},
/*
* Connection states:
* connecting
* connected
* disconnecting
* disconnected - permanent state
*/
_updateConnectionState: function (state) {
var oldstate = this._rfb_connection_state;
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._rfb_connection_state = state;
var smsg = "New state '" + state + "', was '" + oldstate + "'.";
Log.Debug(smsg);
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':
var event = new CustomEvent("connect", { detail: {} });
this.dispatchEvent(event);
break;
case 'disconnecting':
this._disconnect();
this._disconnTimer = setTimeout(function () {
Log.Error("Disconnection timed out.");
this._updateConnectionState('disconnected');
}.bind(this), DISCONNECT_TIMEOUT * 1000);
break;
case 'disconnected':
event = new CustomEvent(
"disconnect", { detail:
{ clean: this._rfb_clean_disconnect } });
this.dispatchEvent(event);
break;
}
},
/* Print errors and disconnect
*
* The parameter 'details' is used for information that
* should be logged but not sent to the user interface.
*/
_fail: function (details) {
switch (this._rfb_connection_state) {
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._rfb_clean_disconnect = 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: function (cap, val) {
this._capabilities[cap] = val;
var event = new CustomEvent("capabilities",
{ detail: { capabilities: this._capabilities } });
this.dispatchEvent(event);
},
_handle_message: function () {
if (this._sock.rQlen() === 0) {
Log.Warn("handle_message called on an empty receive queue");
return;
}
switch (this._rfb_connection_state) {
case 'disconnected':
Log.Error("Got data while disconnected");
break;
case 'connected':
while (true) {
if (this._flushing) {
break;
}
if (!this._normal_msg()) {
break;
}
if (this._sock.rQlen() === 0) {
break;
}
}
break;
default:
this._init_msg();
break;
}
},
_handleKeyEvent: function (keysym, code, down) {
this.sendKey(keysym, code, down);
},
_handleMouseButton: function (x, y, down, bmask) {
if (down) {
this._mouse_buttonMask |= bmask;
} else {
this._mouse_buttonMask &= ~bmask;
}
if (this.dragViewport) {
if (down && !this._viewportDragging) {
this._viewportDragging = true;
this._viewportDragPos = {'x': x, 'y': y};
// Skip sending mouse events
return;
} else {
this._viewportDragging = false;
// If the viewport didn't actually move, then treat as a mouse click event
// Send the button down event here, as the button up event is sent at the end of this function
if (!this._viewportHasMoved && !this._viewOnly) {
RFB.messages.pointerEvent(this._sock, this._display.absX(x), this._display.absY(y), bmask);
}
this._viewportHasMoved = false;
}
}
if (this._viewOnly) { return; } // View only, skip mouse events
if (this._rfb_connection_state !== 'connected') { return; }
RFB.messages.pointerEvent(this._sock, this._display.absX(x), this._display.absY(y), this._mouse_buttonMask);
},
_handleMouseMove: function (x, y) {
if (this._viewportDragging) {
var deltaX = this._viewportDragPos.x - x;
var deltaY = this._viewportDragPos.y - y;
// The goal is to trigger on a certain physical width, the
// devicePixelRatio brings us a bit closer but is not optimal.
var dragThreshold = 10 * (window.devicePixelRatio || 1);
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;
}
if (this._viewOnly) { return; } // View only, skip mouse events
if (this._rfb_connection_state !== 'connected') { return; }
RFB.messages.pointerEvent(this._sock, this._display.absX(x), this._display.absY(y), this._mouse_buttonMask);
},
// Message Handlers
_negotiate_protocol_version: function () {
if (this._sock.rQlen() < 12) {
return this._fail("Received incomplete protocol version.");
}
var sversion = this._sock.rQshiftStr(12).substr(4, 7);
Log.Info("Server ProtocolVersion: " + sversion);
var is_repeater = 0;
switch (sversion) {
case "000.000": // UltraVNC repeater
is_repeater = 1;
break;
case "003.003":
case "003.006": // UltraVNC
case "003.889": // Apple Remote Desktop
this._rfb_version = 3.3;
break;
case "003.007":
this._rfb_version = 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._rfb_version = 3.8;
break;
default:
return this._fail("Invalid server version " + sversion);
}
if (is_repeater) {
var repeaterID = "ID:" + this._repeaterID;
while (repeaterID.length < 250) {
repeaterID += "\0";
}
this._sock.send_string(repeaterID);
return true;
}
if (this._rfb_version > this._rfb_max_version) {
this._rfb_version = this._rfb_max_version;
}
var cversion = "00" + parseInt(this._rfb_version, 10) +
".00" + ((this._rfb_version * 10) % 10);
this._sock.send_string("RFB " + cversion + "\n");
Log.Debug('Sent ProtocolVersion: ' + cversion);
this._rfb_init_state = 'Security';
},
_negotiate_security: function () {
// Polyfill since IE and PhantomJS doesn't have
// TypedArray.includes()
function includes(item, array) {
for (var i = 0; i < array.length; i++) {
if (array[i] === item) {
return true;
}
}
return false;
}
if (this._rfb_version >= 3.7) {
// Server sends supported list, client decides
var num_types = this._sock.rQshift8();
if (this._sock.rQwait("security type", num_types, 1)) { return false; }
if (num_types === 0) {
return this._handle_security_failure("no security types");
}
var types = this._sock.rQshiftBytes(num_types);
Log.Debug("Server security types: " + types);
// Look for each auth in preferred order
this._rfb_auth_scheme = 0;
if (includes(1, types)) {
this._rfb_auth_scheme = 1; // None
} else if (includes(22, types)) {
this._rfb_auth_scheme = 22; // XVP
} else if (includes(16, types)) {
this._rfb_auth_scheme = 16; // Tight
} else if (includes(2, types)) {
this._rfb_auth_scheme = 2; // VNC Auth
} else {
return this._fail("Unsupported security types (types: " + types + ")");
}
this._sock.send([this._rfb_auth_scheme]);
} else {
// Server decides
if (this._sock.rQwait("security scheme", 4)) { return false; }
this._rfb_auth_scheme = this._sock.rQshift32();
}
this._rfb_init_state = 'Authentication';
Log.Debug('Authenticating using scheme: ' + this._rfb_auth_scheme);
return this._init_msg(); // jump to authentication
},
/*
* Get the security failure reason if sent from the server and
* send the 'securityfailure' event.
*
* - The optional parameter context can be used to add some extra
* context to the log output.
*
* - The optional parameter security_result_status can be used to
* add a custom status code to the event.
*/
_handle_security_failure: function (context, security_result_status) {
if (typeof context === 'undefined') {
context = "";
} else {
context = " on " + context;
}
if (typeof security_result_status === 'undefined') {
security_result_status = 1; // fail
}
if (this._sock.rQwait("reason length", 4)) {
return false;
}
let strlen = this._sock.rQshift32();
let reason = "";
if (strlen > 0) {
if (this._sock.rQwait("reason", strlen, 8)) { return false; }
reason = this._sock.rQshiftStr(strlen);
}
if (reason !== "") {
let event = new CustomEvent(
"securityfailure",
{ detail: { status: security_result_status, reason: reason } });
this.dispatchEvent(event);
return this._fail("Security negotiation failed" + context +
" (reason: " + reason + ")");
} else {
let event = new CustomEvent(
"securityfailure",
{ detail: { status: security_result_status } });
this.dispatchEvent(event);
return this._fail("Security negotiation failed" + context);
}
},
// authentication
_negotiate_xvp_auth: function () {
if (!this._rfb_credentials.username ||
!this._rfb_credentials.password ||
!this._rfb_credentials.target) {
var event = new CustomEvent("credentialsrequired",
{ detail: { types: ["username", "password", "target"] } });
this.dispatchEvent(event);
return false;
}
var xvp_auth_str = String.fromCharCode(this._rfb_credentials.username.length) +
String.fromCharCode(this._rfb_credentials.target.length) +
this._rfb_credentials.username +
this._rfb_credentials.target;
this._sock.send_string(xvp_auth_str);
this._rfb_auth_scheme = 2;
return this._negotiate_authentication();
},
_negotiate_std_vnc_auth: function () {
if (this._sock.rQwait("auth challenge", 16)) { return false; }
if (!this._rfb_credentials.password) {
var event = new CustomEvent("credentialsrequired",
{ detail: { types: ["password"] } });
this.dispatchEvent(event);
return false;
}
// TODO(directxman12): make genDES not require an Array
var challenge = Array.prototype.slice.call(this._sock.rQshiftBytes(16));
var response = RFB.genDES(this._rfb_credentials.password, challenge);
this._sock.send(response);
this._rfb_init_state = "SecurityResult";
return true;
},
_negotiate_tight_tunnels: function (numTunnels) {
var clientSupportedTunnelTypes = {
0: { vendor: 'TGHT', signature: 'NOTUNNEL' }
};
var serverSupportedTunnelTypes = {};
// receive tunnel capabilities
for (var i = 0; i < numTunnels; i++) {
var cap_code = this._sock.rQshift32();
var cap_vendor = this._sock.rQshiftStr(4);
var cap_signature = this._sock.rQshiftStr(8);
serverSupportedTunnelTypes[cap_code] = { vendor: cap_vendor, signature: cap_signature };
}
// 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");
}
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");
}
},
_negotiate_tight_auth: function () {
if (!this._rfb_tightvnc) { // first pass, do the tunnel negotiation
if (this._sock.rQwait("num tunnels", 4)) { return false; }
var numTunnels = this._sock.rQshift32();
if (numTunnels > 0 && this._sock.rQwait("tunnel capabilities", 16 * numTunnels, 4)) { return false; }
this._rfb_tightvnc = true;
if (numTunnels > 0) {
this._negotiate_tight_tunnels(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; }
var subAuthCount = this._sock.rQshift32();
if (subAuthCount === 0) { // empty sub-auth list received means 'no auth' subtype selected
this._rfb_init_state = 'SecurityResult';
return true;
}
if (this._sock.rQwait("sub auth capabilities", 16 * subAuthCount, 4)) { return false; }
var clientSupportedTypes = {
'STDVNOAUTH__': 1,
'STDVVNCAUTH_': 2
};
var serverSupportedTypes = [];
for (var i = 0; i < subAuthCount; i++) {
var capNum = this._sock.rQshift32();
var capabilities = this._sock.rQshiftStr(12);
serverSupportedTypes.push(capabilities);
}
for (var authType in clientSupportedTypes) {
if (serverSupportedTypes.indexOf(authType) != -1) {
this._sock.send([0, 0, 0, clientSupportedTypes[authType]]);
switch (authType) {
case 'STDVNOAUTH__': // no auth
this._rfb_init_state = 'SecurityResult';
return true;
case 'STDVVNCAUTH_': // VNC auth
this._rfb_auth_scheme = 2;
return this._init_msg();
default:
return this._fail("Unsupported tiny auth scheme " +
"(scheme: " + authType + ")");
}
}
}
return this._fail("No supported sub-auth types!");
},
_negotiate_authentication: function () {
switch (this._rfb_auth_scheme) {
case 0: // connection failed
return this._handle_security_failure("authentication scheme");
case 1: // no auth
if (this._rfb_version >= 3.8) {
this._rfb_init_state = 'SecurityResult';
return true;
}
this._rfb_init_state = 'ClientInitialisation';
return this._init_msg();
case 22: // XVP auth
return this._negotiate_xvp_auth();
case 2: // VNC authentication
return this._negotiate_std_vnc_auth();
case 16: // TightVNC Security Type
return this._negotiate_tight_auth();
default:
return this._fail("Unsupported auth scheme (scheme: " +
this._rfb_auth_scheme + ")");
}
},
_handle_security_result: function () {
if (this._sock.rQwait('VNC auth response ', 4)) { return false; }
let status = this._sock.rQshift32();
if (status === 0) { // OK
this._rfb_init_state = 'ClientInitialisation';
Log.Debug('Authentication OK');
return this._init_msg();
} else {
if (this._rfb_version >= 3.8) {
return this._handle_security_failure("security result", status);
} else {
let event = new CustomEvent("securityfailure",
{ detail: { status: status } });
this.dispatchEvent(event);
return this._fail("Security handshake failed");
}
}
},
_negotiate_server_init: function () {
if (this._sock.rQwait("server initialization", 24)) { return false; }
/* Screen size */
var width = this._sock.rQshift16();
var height = this._sock.rQshift16();
/* PIXEL_FORMAT */
var bpp = this._sock.rQshift8();
var depth = this._sock.rQshift8();
var big_endian = this._sock.rQshift8();
var true_color = this._sock.rQshift8();
var red_max = this._sock.rQshift16();
var green_max = this._sock.rQshift16();
var blue_max = this._sock.rQshift16();
var red_shift = this._sock.rQshift8();
var green_shift = this._sock.rQshift8();
var blue_shift = 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 */
var name_length = this._sock.rQshift32();
if (this._sock.rQwait('server init name', name_length, 24)) { return false; }
this._fb_name = decodeUTF8(this._sock.rQshiftStr(name_length));
if (this._rfb_tightvnc) {
if (this._sock.rQwait('TightVNC extended server init header', 8, 24 + name_length)) { return false; }
// In TightVNC mode, ServerInit message is extended
var numServerMessages = this._sock.rQshift16();
var numClientMessages = this._sock.rQshift16();
var numEncodings = this._sock.rQshift16();
this._sock.rQskipBytes(2); // padding
var totalMessagesLength = (numServerMessages + numClientMessages + numEncodings) * 16;
if (this._sock.rQwait('TightVNC extended server init header', totalMessagesLength, 32 + name_length)) { 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 +
", big_endian: " + big_endian +
", true_color: " + true_color +
", red_max: " + red_max +
", green_max: " + green_max +
", blue_max: " + blue_max +
", red_shift: " + red_shift +
", green_shift: " + green_shift +
", blue_shift: " + blue_shift);
if (big_endian !== 0) {
Log.Warn("Server native endian is not little endian");
}
if (red_shift !== 16) {
Log.Warn("Server native red-shift is not 16");
}
if (blue_shift !== 0) {
Log.Warn("Server native blue-shift is not 0");
}
// we're past the point where we could backtrack, so it's safe to call this
var event = new CustomEvent("desktopname",
{ detail: { name: this._fb_name } });
this.dispatchEvent(event);
this._resize(width, height);
if (!this._viewOnly) { this._keyboard.grab(); }
if (!this._viewOnly) { this._mouse.grab(); }
this._fb_depth = 24;
if (this._fb_name === "Intel(r) AMT KVM") {
Log.Warn("Intel AMT KVM only supports 8/16 bit depths. Using low color mode.");
this._fb_depth = 8;
}
RFB.messages.pixelFormat(this._sock, this._fb_depth, true);
this._sendEncodings();
RFB.messages.fbUpdateRequest(this._sock, false, 0, 0, this._fb_width, this._fb_height);
this._timing.fbu_rt_start = (new Date()).getTime();
this._timing.pixels = 0;
// Cursor will be server side until the server decides to honor
// our request and send over the cursor image
this._display.disableLocalCursor();
this._updateConnectionState('connected');
return true;
},
_sendEncodings: function () {
var encs = [];
// In preference order
encs.push(encodings.encodingCopyRect);
// Only supported with full depth support
if (this._fb_depth == 24) {
encs.push(encodings.encodingTight);
encs.push(encodings.encodingHextile);
encs.push(encodings.encodingRRE);
}
encs.push(encodings.encodingRaw);
// Psuedo-encoding settings
encs.push(encodings.pseudoEncodingTightPNG);
encs.push(encodings.pseudoEncodingQualityLevel0 + 6);
encs.push(encodings.pseudoEncodingCompressLevel0 + 2);
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);
if (browserSupportsCursorURIs() &&
!isTouchDevice && this._fb_depth == 24) {
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
*/
_init_msg: function () {
switch (this._rfb_init_state) {
case 'ProtocolVersion':
return this._negotiate_protocol_version();
case 'Security':
return this._negotiate_security();
case 'Authentication':
return this._negotiate_authentication();
case 'SecurityResult':
return this._handle_security_result();
case 'ClientInitialisation':
this._sock.send([this._shared ? 1 : 0]); // ClientInitialisation
this._rfb_init_state = 'ServerInitialisation';
return true;
case 'ServerInitialisation':
return this._negotiate_server_init();
default:
return this._fail("Unknown init state (state: " +
this._rfb_init_state + ")");
}
},
_handle_set_colour_map_msg: function () {
Log.Debug("SetColorMapEntries");
return this._fail("Unexpected SetColorMapEntries message");
},
_handle_server_cut_text: function () {
Log.Debug("ServerCutText");
if (this._sock.rQwait("ServerCutText header", 7, 1)) { return false; }
this._sock.rQskipBytes(3); // Padding
var length = this._sock.rQshift32();
if (this._sock.rQwait("ServerCutText", length, 8)) { return false; }
var text = this._sock.rQshiftStr(length);
if (this._viewOnly) { return true; }
var event = new CustomEvent("clipboard",
{ detail: { text: text } });
this.dispatchEvent(event);
return true;
},
_handle_server_fence_msg: function() {
if (this._sock.rQwait("ServerFence header", 8, 1)) { return false; }
this._sock.rQskipBytes(3); // Padding
var flags = this._sock.rQshift32();
var 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;
}
var 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;
},
_handle_xvp_msg: function () {
if (this._sock.rQwait("XVP version and message", 3, 1)) { return false; }
this._sock.rQskip8(); // Padding
var xvp_ver = this._sock.rQshift8();
var xvp_msg = this._sock.rQshift8();
switch (xvp_msg) {
case 0: // XVP_FAIL
Log.Error("XVP Operation Failed");
break;
case 1: // XVP_INIT
this._rfb_xvp_ver = xvp_ver;
Log.Info("XVP extensions enabled (version " + this._rfb_xvp_ver + ")");
this._setCapability("power", true);
break;
default:
this._fail("Illegal server XVP message (msg: " + xvp_msg + ")");
break;
}
return true;
},
_normal_msg: function () {
var msg_type;
if (this._FBU.rects > 0) {
msg_type = 0;
} else {
msg_type = this._sock.rQshift8();
}
switch (msg_type) {
case 0: // FramebufferUpdate
var ret = this._framebufferUpdate();
if (ret && !this._enabledContinuousUpdates) {
RFB.messages.fbUpdateRequest(this._sock, true, 0, 0,
this._fb_width, this._fb_height);
}
return ret;
case 1: // SetColorMapEntries
return this._handle_set_colour_map_msg();
case 2: // Bell
Log.Debug("Bell");
var event = new CustomEvent("bell", { detail: {} });
this.dispatchEvent(event);
return true;
case 3: // ServerCutText
return this._handle_server_cut_text();
case 150: // EndOfContinuousUpdates
var 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._handle_server_fence_msg();
case 250: // XVP
return this._handle_xvp_msg();
default:
this._fail("Unexpected server message (type " + msg_type + ")");
Log.Debug("sock.rQslice(0, 30): " + this._sock.rQslice(0, 30));
return true;
}
},
_onFlush: function() {
this._flushing = false;
// Resume processing
if (this._sock.rQlen() > 0) {
this._handle_message();
}
},
_framebufferUpdate: function () {
var ret = true;
var now;
if (this._FBU.rects === 0) {
if (this._sock.rQwait("FBU header", 3, 1)) { return false; }
this._sock.rQskip8(); // Padding
this._FBU.rects = this._sock.rQshift16();
this._FBU.bytes = 0;
this._timing.cur_fbu = 0;
if (this._timing.fbu_rt_start > 0) {
now = (new Date()).getTime();
Log.Info("First FBU latency: " + (now - this._timing.fbu_rt_start));
}
// 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._rfb_connection_state !== 'connected') { return false; }
if (this._sock.rQwait("FBU", this._FBU.bytes)) { return false; }
if (this._FBU.bytes === 0) {
if (this._sock.rQwait("rect header", 12)) { return false; }
/* New FramebufferUpdate */
var 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._encHandlers[this._FBU.encoding]) {
this._fail("Unsupported encoding (encoding: " +
this._FBU.encoding + ")");
return false;
}
}
this._timing.last_fbu = (new Date()).getTime();
ret = this._encHandlers[this._FBU.encoding]();
now = (new Date()).getTime();
this._timing.cur_fbu += (now - this._timing.last_fbu);
if (ret) {
if (!(this._FBU.encoding in this._encStats)) {
this._encStats[this._FBU.encoding] = [0, 0];
}
this._encStats[this._FBU.encoding][0]++;
this._encStats[this._FBU.encoding][1]++;
this._timing.pixels += this._FBU.width * this._FBU.height;
}
if (this._timing.pixels >= (this._fb_width * this._fb_height)) {
if ((this._FBU.width === this._fb_width && this._FBU.height === this._fb_height) ||
this._timing.fbu_rt_start > 0) {
this._timing.full_fbu_total += this._timing.cur_fbu;
this._timing.full_fbu_cnt++;
Log.Info("Timing of full FBU, curr: " +
this._timing.cur_fbu + ", total: " +
this._timing.full_fbu_total + ", cnt: " +
this._timing.full_fbu_cnt + ", avg: " +
(this._timing.full_fbu_total / this._timing.full_fbu_cnt));
}
if (this._timing.fbu_rt_start > 0) {
var fbu_rt_diff = now - this._timing.fbu_rt_start;
this._timing.fbu_rt_total += fbu_rt_diff;
this._timing.fbu_rt_cnt++;
Log.Info("full FBU round-trip, cur: " +
fbu_rt_diff + ", total: " +
this._timing.fbu_rt_total + ", cnt: " +
this._timing.fbu_rt_cnt + ", avg: " +
(this._timing.fbu_rt_total / this._timing.fbu_rt_cnt));
this._timing.fbu_rt_start = 0;
}
}
if (!ret) { return ret; } // need more data
}
this._display.flip();
return true; // We finished this FBU
},
_updateContinuousUpdates: function() {
if (!this._enabledContinuousUpdates) { return; }
RFB.messages.enableContinuousUpdates(this._sock, true, 0, 0,
this._fb_width, this._fb_height);
},
_resize: function(width, height) {
this._fb_width = width;
this._fb_height = height;
this._destBuff = new Uint8Array(this._fb_width * this._fb_height * 4);
this._display.resize(this._fb_width, this._fb_height);
var event = new CustomEvent("fbresize",
{ detail: { width: this._fb_width,
height: this._fb_height } });
this.dispatchEvent(event);
this._timing.fbu_rt_start = (new Date()).getTime();
this._updateContinuousUpdates();
},
_xvpOp: function (ver, op) {
if (this._rfb_xvp_ver < ver) { return; }
Log.Info("Sending XVP operation " + op + " (version " + ver + ")");
RFB.messages.xvpOp(this._sock, ver, op);
},
};
Object.assign(RFB.prototype, EventTargetMixin);
// Class Methods
RFB.messages = {
keyEvent: function (sock, keysym, down) {
var buff = sock._sQ;
var 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: function (sock, keysym, down, keycode) {
function getRFBkeycode(xt_scancode) {
var upperByte = (keycode >> 8);
var lowerByte = (keycode & 0x00ff);
if (upperByte === 0xe0 && lowerByte < 0x7f) {
lowerByte = lowerByte | 0x80;
return lowerByte;
}
return xt_scancode;
}
var buff = sock._sQ;
var 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;
var 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: function (sock, x, y, mask) {
var buff = sock._sQ;
var 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();
},
// TODO(directxman12): make this unicode compatible?
clientCutText: function (sock, text) {
var buff = sock._sQ;
var offset = sock._sQlen;
buff[offset] = 6; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = 0; // padding
buff[offset + 3] = 0; // padding
var n = text.length;
buff[offset + 4] = n >> 24;
buff[offset + 5] = n >> 16;
buff[offset + 6] = n >> 8;
buff[offset + 7] = n;
for (var i = 0; i < n; i++) {
buff[offset + 8 + i] = text.charCodeAt(i);
}
sock._sQlen += 8 + n;
sock.flush();
},
setDesktopSize: function (sock, width, height, id, flags) {
var buff = sock._sQ;
var 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: function (sock, flags, payload) {
var buff = sock._sQ;
var 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;
var n = payload.length;
buff[offset + 8] = n; // length
for (var i = 0; i < n; i++) {
buff[offset + 9 + i] = payload.charCodeAt(i);
}
sock._sQlen += 9 + n;
sock.flush();
},
enableContinuousUpdates: function (sock, enable, x, y, width, height) {
var buff = sock._sQ;
var 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: function (sock, depth, true_color) {
var buff = sock._sQ;
var offset = sock._sQlen;
var bpp, bits;
if (depth > 16) {
bpp = 32;
} else if (depth > 8) {
bpp = 16;
} else {
bpp = 8;
}
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] = true_color ? 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 * 2; // red-shift
buff[offset + 15] = bits * 1; // green-shift
buff[offset + 16] = bits * 0; // blue-shift
buff[offset + 17] = 0; // padding
buff[offset + 18] = 0; // padding
buff[offset + 19] = 0; // padding
sock._sQlen += 20;
sock.flush();
},
clientEncodings: function (sock, encodings) {
var buff = sock._sQ;
var offset = sock._sQlen;
buff[offset] = 2; // msg-type
buff[offset + 1] = 0; // padding
buff[offset + 2] = encodings.length >> 8;
buff[offset + 3] = encodings.length;
var i, j = offset + 4;
for (i = 0; i < encodings.length; i++) {
var 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: function (sock, incremental, x, y, w, h) {
var buff = sock._sQ;
var 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: function (sock, ver, op) {
var buff = sock._sQ;
var 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.genDES = function (password, challenge) {
var passwd = [];
for (var i = 0; i < password.length; i++) {
passwd.push(password.charCodeAt(i));
}
return (new DES(passwd)).encrypt(challenge);
};
RFB.encodingHandlers = {
RAW: function () {
if (this._FBU.lines === 0) {
this._FBU.lines = this._FBU.height;
}
var pixelSize = this._fb_depth == 8 ? 1 : 4;
this._FBU.bytes = this._FBU.width * pixelSize; // at least a line
if (this._sock.rQwait("RAW", this._FBU.bytes)) { return false; }
var cur_y = this._FBU.y + (this._FBU.height - this._FBU.lines);
var curr_height = Math.min(this._FBU.lines,
Math.floor(this._sock.rQlen() / (this._FBU.width * pixelSize)));
var data = this._sock.get_rQ();
var index = this._sock.get_rQi();
if (this._fb_depth == 8) {
var pixels = this._FBU.width * curr_height
var newdata = new Uint8Array(pixels * 4);
var i;
for (i = 0;i < pixels;i++) {
newdata[i * 4 + 0] = ((data[index + i] >> 0) & 0x3) * 255 / 3;
newdata[i * 4 + 1] = ((data[index + i] >> 2) & 0x3) * 255 / 3;
newdata[i * 4 + 2] = ((data[index + i] >> 4) & 0x3) * 255 / 3;
newdata[i * 4 + 4] = 0;
}
data = newdata;
index = 0;
}
this._display.blitImage(this._FBU.x, cur_y, this._FBU.width,
curr_height, data, index);
this._sock.rQskipBytes(this._FBU.width * curr_height * pixelSize);
this._FBU.lines -= curr_height;
if (this._FBU.lines > 0) {
this._FBU.bytes = this._FBU.width * pixelSize; // At least another line
} else {
this._FBU.rects--;
this._FBU.bytes = 0;
}
return true;
},
COPYRECT: function () {
this._FBU.bytes = 4;
if (this._sock.rQwait("COPYRECT", 4)) { return false; }
this._display.copyImage(this._sock.rQshift16(), this._sock.rQshift16(),
this._FBU.x, this._FBU.y, this._FBU.width,
this._FBU.height);
this._FBU.rects--;
this._FBU.bytes = 0;
return true;
},
RRE: function () {
var color;
if (this._FBU.subrects === 0) {
this._FBU.bytes = 4 + 4;
if (this._sock.rQwait("RRE", 4 + 4)) { return false; }
this._FBU.subrects = this._sock.rQshift32();
color = this._sock.rQshiftBytes(4); // Background
this._display.fillRect(this._FBU.x, this._FBU.y, this._FBU.width, this._FBU.height, color);
}
while (this._FBU.subrects > 0 && this._sock.rQlen() >= (4 + 8)) {
color = this._sock.rQshiftBytes(4);
var x = this._sock.rQshift16();
var y = this._sock.rQshift16();
var width = this._sock.rQshift16();
var height = this._sock.rQshift16();
this._display.fillRect(this._FBU.x + x, this._FBU.y + y, width, height, color);
this._FBU.subrects--;
}
if (this._FBU.subrects > 0) {
var chunk = Math.min(this._rre_chunk_sz, this._FBU.subrects);
this._FBU.bytes = (4 + 8) * chunk;
} else {
this._FBU.rects--;
this._FBU.bytes = 0;
}
return true;
},
HEXTILE: function () {
var rQ = this._sock.get_rQ();
var rQi = this._sock.get_rQi();
if (this._FBU.tiles === 0) {
this._FBU.tiles_x = Math.ceil(this._FBU.width / 16);
this._FBU.tiles_y = Math.ceil(this._FBU.height / 16);
this._FBU.total_tiles = this._FBU.tiles_x * this._FBU.tiles_y;
this._FBU.tiles = this._FBU.total_tiles;
}
while (this._FBU.tiles > 0) {
this._FBU.bytes = 1;
if (this._sock.rQwait("HEXTILE subencoding", this._FBU.bytes)) { return false; }
var subencoding = rQ[rQi]; // Peek
if (subencoding > 30) { // Raw
this._fail("Illegal hextile subencoding (subencoding: " +
subencoding + ")");
return false;
}
var subrects = 0;
var curr_tile = this._FBU.total_tiles - this._FBU.tiles;
var tile_x = curr_tile % this._FBU.tiles_x;
var tile_y = Math.floor(curr_tile / this._FBU.tiles_x);
var x = this._FBU.x + tile_x * 16;
var y = this._FBU.y + tile_y * 16;
var w = Math.min(16, (this._FBU.x + this._FBU.width) - x);
var h = Math.min(16, (this._FBU.y + this._FBU.height) - y);
// Figure out how much we are expecting
if (subencoding & 0x01) { // Raw
this._FBU.bytes += w * h * 4;
} else {
if (subencoding & 0x02) { // Background
this._FBU.bytes += 4;
}
if (subencoding & 0x04) { // Foreground
this._FBU.bytes += 4;
}
if (subencoding & 0x08) { // AnySubrects
this._FBU.bytes++; // Since we aren't shifting it off
if (this._sock.rQwait("hextile subrects header", this._FBU.bytes)) { return false; }
subrects = rQ[rQi + this._FBU.bytes - 1]; // Peek
if (subencoding & 0x10) { // SubrectsColoured
this._FBU.bytes += subrects * (4 + 2);
} else {
this._FBU.bytes += subrects * 2;
}
}
}
if (this._sock.rQwait("hextile", this._FBU.bytes)) { return false; }
// We know the encoding and have a whole tile
this._FBU.subencoding = rQ[rQi];
rQi++;
if (this._FBU.subencoding === 0) {
if (this._FBU.lastsubencoding & 0x01) {
// Weird: ignore blanks are RAW
Log.Debug(" Ignoring blank after RAW");
} else {
this._display.fillRect(x, y, w, h, this._FBU.background);
}
} else if (this._FBU.subencoding & 0x01) { // Raw
this._display.blitImage(x, y, w, h, rQ, rQi);
rQi += this._FBU.bytes - 1;
} else {
if (this._FBU.subencoding & 0x02) { // Background
this._FBU.background = [rQ[rQi], rQ[rQi + 1], rQ[rQi + 2], rQ[rQi + 3]];
rQi += 4;
}
if (this._FBU.subencoding & 0x04) { // Foreground
this._FBU.foreground = [rQ[rQi], rQ[rQi + 1], rQ[rQi + 2], rQ[rQi + 3]];
rQi += 4;
}
this._display.startTile(x, y, w, h, this._FBU.background);
if (this._FBU.subencoding & 0x08) { // AnySubrects
subrects = rQ[rQi];
rQi++;
for (var s = 0; s < subrects; s++) {
var color;
if (this._FBU.subencoding & 0x10) { // SubrectsColoured
color = [rQ[rQi], rQ[rQi + 1], rQ[rQi + 2], rQ[rQi + 3]];
rQi += 4;
} else {
color = this._FBU.foreground;
}
var xy = rQ[rQi];
rQi++;
var sx = (xy >> 4);
var sy = (xy & 0x0f);
var wh = rQ[rQi];
rQi++;
var sw = (wh >> 4) + 1;
var sh = (wh & 0x0f) + 1;
this._display.subTile(sx, sy, sw, sh, color);
}
}
this._display.finishTile();
}
this._sock.set_rQi(rQi);
this._FBU.lastsubencoding = this._FBU.subencoding;
this._FBU.bytes = 0;
this._FBU.tiles--;
}
if (this._FBU.tiles === 0) {
this._FBU.rects--;
}
return true;
},
TIGHT: function () {
this._FBU.bytes = 1; // compression-control byte
if (this._sock.rQwait("TIGHT compression-control", this._FBU.bytes)) { return false; }
var checksum = function (data) {
var sum = 0;
for (var i = 0; i < data.length; i++) {
sum += data[i];
if (sum > 65536) sum -= 65536;
}
return sum;
};
var resetStreams = 0;
var streamId = -1;
var decompress = function (data, expected) {
for (var i = 0; i < 4; i++) {
if ((resetStreams >> i) & 1) {
this._FBU.zlibs[i].reset();
Log.Info("Reset zlib stream " + i);
}
}
//var uncompressed = this._FBU.zlibs[streamId].uncompress(data, 0);
var uncompressed = this._FBU.zlibs[streamId].inflate(data, true, expected);
/*if (uncompressed.status !== 0) {
Log.Error("Invalid data in zlib stream");
}*/
//return uncompressed.data;
return uncompressed;
}.bind(this);
var indexedToRGBX2Color = function (data, palette, width, height) {
// Convert indexed (palette based) image data to RGB
// TODO: reduce number of calculations inside loop
var dest = this._destBuff;
var w = Math.floor((width + 7) / 8);
var w1 = Math.floor(width / 8);
/*for (var y = 0; y < height; y++) {
var b, x, dp, sp;
var yoffset = y * width;
var ybitoffset = y * w;
var xoffset, targetbyte;
for (x = 0; x < w1; x++) {
xoffset = yoffset + x * 8;
targetbyte = data[ybitoffset + x];
for (b = 7; b >= 0; b--) {
dp = (xoffset + 7 - b) * 3;
sp = (targetbyte >> b & 1) * 3;
dest[dp] = palette[sp];
dest[dp + 1] = palette[sp + 1];
dest[dp + 2] = palette[sp + 2];
}
}
xoffset = yoffset + x * 8;
targetbyte = data[ybitoffset + x];
for (b = 7; b >= 8 - width % 8; b--) {
dp = (xoffset + 7 - b) * 3;
sp = (targetbyte >> b & 1) * 3;
dest[dp] = palette[sp];
dest[dp + 1] = palette[sp + 1];
dest[dp + 2] = palette[sp + 2];
}
}*/
for (var y = 0; y < height; y++) {
var b, x, dp, sp;
for (x = 0; x < w1; x++) {
for (b = 7; b >= 0; b--) {
dp = (y * width + x * 8 + 7 - b) * 4;
sp = (data[y * w + x] >> b & 1) * 3;
dest[dp] = palette[sp];
dest[dp + 1] = palette[sp + 1];
dest[dp + 2] = palette[sp + 2];
dest[dp + 3] = 255;
}
}
for (b = 7; b >= 8 - width % 8; b--) {
dp = (y * width + x * 8 + 7 - b) * 4;
sp = (data[y * w + x] >> b & 1) * 3;
dest[dp] = palette[sp];
dest[dp + 1] = palette[sp + 1];
dest[dp + 2] = palette[sp + 2];
dest[dp + 3] = 255;
}
}
return dest;
}.bind(this);
var indexedToRGBX = function (data, palette, width, height) {
// Convert indexed (palette based) image data to RGB
var dest = this._destBuff;
var total = width * height * 4;
for (var i = 0, j = 0; i < total; i += 4, j++) {
var sp = data[j] * 3;
dest[i] = palette[sp];
dest[i + 1] = palette[sp + 1];
dest[i + 2] = palette[sp + 2];
dest[i + 3] = 255;
}
return dest;
}.bind(this);
var rQi = this._sock.get_rQi();
var rQ = this._sock.rQwhole();
var cmode, data;
var cl_header, cl_data;
var handlePalette = function () {
var numColors = rQ[rQi + 2] + 1;
var paletteSize = numColors * 3;
this._FBU.bytes += paletteSize;
if (this._sock.rQwait("TIGHT palette " + cmode, this._FBU.bytes)) { return false; }
var bpp = (numColors <= 2) ? 1 : 8;
var rowSize = Math.floor((this._FBU.width * bpp + 7) / 8);
var raw = false;
if (rowSize * this._FBU.height < 12) {
raw = true;
cl_header = 0;
cl_data = rowSize * this._FBU.height;
//clength = [0, rowSize * this._FBU.height];
} else {
// begin inline getTightCLength (returning two-item arrays is bad for performance with GC)
var cl_offset = rQi + 3 + paletteSize;
cl_header = 1;
cl_data = 0;
cl_data += rQ[cl_offset] & 0x7f;
if (rQ[cl_offset] & 0x80) {
cl_header++;
cl_data += (rQ[cl_offset + 1] & 0x7f) << 7;
if (rQ[cl_offset + 1] & 0x80) {
cl_header++;
cl_data += rQ[cl_offset + 2] << 14;
}
}
// end inline getTightCLength
}
this._FBU.bytes += cl_header + cl_data;
if (this._sock.rQwait("TIGHT " + cmode, this._FBU.bytes)) { return false; }
// Shift ctl, filter id, num colors, palette entries, and clength off
this._sock.rQskipBytes(3);
//var palette = this._sock.rQshiftBytes(paletteSize);
this._sock.rQshiftTo(this._paletteBuff, paletteSize);
this._sock.rQskipBytes(cl_header);
if (raw) {
data = this._sock.rQshiftBytes(cl_data);
} else {
data = decompress(this._sock.rQshiftBytes(cl_data), rowSize * this._FBU.height);
}
// Convert indexed (palette based) image data to RGB
var rgbx;
if (numColors == 2) {
rgbx = indexedToRGBX2Color(data, this._paletteBuff, this._FBU.width, this._FBU.height);
this._display.blitRgbxImage(this._FBU.x, this._FBU.y, this._FBU.width, this._FBU.height, rgbx, 0, false);
} else {
rgbx = indexedToRGBX(data, this._paletteBuff, this._FBU.width, this._FBU.height);
this._display.blitRgbxImage(this._FBU.x, this._FBU.y, this._FBU.width, this._FBU.height, rgbx, 0, false);
}
return true;
}.bind(this);
var handleCopy = function () {
var raw = false;
var uncompressedSize = this._FBU.width * this._FBU.height * 3;
if (uncompressedSize < 12) {
raw = true;
cl_header = 0;
cl_data = uncompressedSize;
} else {
// begin inline getTightCLength (returning two-item arrays is for peformance with GC)
var cl_offset = rQi + 1;
cl_header = 1;
cl_data = 0;
cl_data += rQ[cl_offset] & 0x7f;
if (rQ[cl_offset] & 0x80) {
cl_header++;
cl_data += (rQ[cl_offset + 1] & 0x7f) << 7;
if (rQ[cl_offset + 1] & 0x80) {
cl_header++;
cl_data += rQ[cl_offset + 2] << 14;
}
}
// end inline getTightCLength
}
this._FBU.bytes = 1 + cl_header + cl_data;
if (this._sock.rQwait("TIGHT " + cmode, this._FBU.bytes)) { return false; }
// Shift ctl, clength off
this._sock.rQshiftBytes(1 + cl_header);
if (raw) {
data = this._sock.rQshiftBytes(cl_data);
} else {
data = decompress(this._sock.rQshiftBytes(cl_data), uncompressedSize);
}
this._display.blitRgbImage(this._FBU.x, this._FBU.y, this._FBU.width, this._FBU.height, data, 0, false);
return true;
}.bind(this);
var ctl = this._sock.rQpeek8();
// Keep tight reset bits
resetStreams = ctl & 0xF;
// Figure out filter
ctl = ctl >> 4;
streamId = ctl & 0x3;
if (ctl === 0x08) cmode = "fill";
else if (ctl === 0x09) cmode = "jpeg";
else if (ctl === 0x0A) cmode = "png";
else if (ctl & 0x04) cmode = "filter";
else if (ctl < 0x04) cmode = "copy";
else return this._fail("Illegal tight compression received (ctl: " +
ctl + ")");
switch (cmode) {
// fill use depth because TPIXELs drop the padding byte
case "fill": // TPIXEL
this._FBU.bytes += 3;
break;
case "jpeg": // max clength
this._FBU.bytes += 3;
break;
case "png": // max clength
this._FBU.bytes += 3;
break;
case "filter": // filter id + num colors if palette
this._FBU.bytes += 2;
break;
case "copy":
break;
}
if (this._sock.rQwait("TIGHT " + cmode, this._FBU.bytes)) { return false; }
// Determine FBU.bytes
switch (cmode) {
case "fill":
// skip ctl byte
this._display.fillRect(this._FBU.x, this._FBU.y, this._FBU.width, this._FBU.height, [rQ[rQi + 3], rQ[rQi + 2], rQ[rQi + 1]], false);
this._sock.rQskipBytes(4);
break;
case "png":
case "jpeg":
// begin inline getTightCLength (returning two-item arrays is for peformance with GC)
var cl_offset = rQi + 1;
cl_header = 1;
cl_data = 0;
cl_data += rQ[cl_offset] & 0x7f;
if (rQ[cl_offset] & 0x80) {
cl_header++;
cl_data += (rQ[cl_offset + 1] & 0x7f) << 7;
if (rQ[cl_offset + 1] & 0x80) {
cl_header++;
cl_data += rQ[cl_offset + 2] << 14;
}
}
// end inline getTightCLength
this._FBU.bytes = 1 + cl_header + cl_data; // ctl + clength size + jpeg-data
if (this._sock.rQwait("TIGHT " + cmode, this._FBU.bytes)) { return false; }
// We have everything, render it
this._sock.rQskipBytes(1 + cl_header); // shift off clt + compact length
data = this._sock.rQshiftBytes(cl_data);
this._display.imageRect(this._FBU.x, this._FBU.y, "image/" + cmode, data);
break;
case "filter":
var filterId = rQ[rQi + 1];
if (filterId === 1) {
if (!handlePalette()) { return false; }
} else {
// Filter 0, Copy could be valid here, but servers don't send it as an explicit filter
// Filter 2, Gradient is valid but not use if jpeg is enabled
this._fail("Unsupported tight subencoding received " +
"(filter: " + filterId + ")");
}
break;
case "copy":
if (!handleCopy()) { return false; }
break;
}
this._FBU.bytes = 0;
this._FBU.rects--;
return true;
},
last_rect: function () {
this._FBU.rects = 0;
return true;
},
ExtendedDesktopSize: function () {
this._FBU.bytes = 1;
if (this._sock.rQwait("ExtendedDesktopSize", this._FBU.bytes)) { return false; }
this._supportsSetDesktopSize = true;
this._setCapability("resize", true);
var number_of_screens = this._sock.rQpeek8();
this._FBU.bytes = 4 + (number_of_screens * 16);
if (this._sock.rQwait("ExtendedDesktopSize", this._FBU.bytes)) { return false; }
this._sock.rQskipBytes(1); // number-of-screens
this._sock.rQskipBytes(3); // padding
for (var i = 0; i < number_of_screens; i += 1) {
// Save the id and flags of the first screen
if (i === 0) {
this._screen_id = 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._screen_flags = 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) {
var 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);
}
this._FBU.bytes = 0;
this._FBU.rects -= 1;
return true;
},
DesktopSize: function () {
this._resize(this._FBU.width, this._FBU.height);
this._FBU.bytes = 0;
this._FBU.rects -= 1;
return true;
},
Cursor: function () {
Log.Debug(">> set_cursor");
var x = this._FBU.x; // hotspot-x
var y = this._FBU.y; // hotspot-y
var w = this._FBU.width;
var h = this._FBU.height;
var pixelslength = w * h * 4;
var masklength = Math.floor((w + 7) / 8) * h;
this._FBU.bytes = pixelslength + masklength;
if (this._sock.rQwait("cursor encoding", this._FBU.bytes)) { return false; }
this._display.changeCursor(this._sock.rQshiftBytes(pixelslength),
this._sock.rQshiftBytes(masklength),
x, y, w, h);
this._FBU.bytes = 0;
this._FBU.rects--;
Log.Debug("<< set_cursor");
return true;
},
QEMUExtendedKeyEvent: function () {
this._FBU.rects--;
// Old Safari doesn't support creating keyboard events
try {
var keyboardEvent = document.createEvent("keyboardEvent");
if (keyboardEvent.code !== undefined) {
this._qemuExtKeyEventSupported = true;
}
} catch (err) {
}
},
};
Reference in New Issue View Git Blame Copy Permalink