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rfb.js
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rfb.js
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// rfb client module
// http://www.realvnc.com/docs/rfbproto.pdf
var sys = require('sys');
var net = require('net');
var Buffer = require('buffer').Buffer;
var EventEmitter = require('events').EventEmitter;
var BufferList = require('bufferlist').BufferList;
var Binary = require('bufferlist/binary').Binary;
var Put = require('rfb/put').Put;
var clientMsgTypes = {
setPixelFormat : 0,
setEncodings : 2,
fbUpdate : 3,
keyEvent : 4,
pointerEvent : 5,
cutText : 6
};
var serverMsgTypes = {
fbUpdate : 0,
setColorMap : 1,
bell: 2,
cutText: 3
};
var encodings = {
raw : 0,
copyRect : 1,
rre : 2,
hextile : 3,
zrle : 16
};
RFB.prototype = new EventEmitter;
exports.RFB = RFB;
function RFB(opts) {
var rfb = this;
if (typeof(opts) == 'undefined') opts = {};
rfb.host = opts.host || 'localhost';
rfb.port = opts.port || 5900;
rfb.shared = opts.shared || false;
rfb.securityType = opts.securityType || 'none';
rfb.errorCallback = opts.errorCallback
|| function (exception) {
sys.log(
'Connection error: ' + exception.message
+ '\n' + exception.stack
);
};
rfb.fb = { width : null, height : null };
var stream = new net.Stream;
var bufferList = new BufferList;
var parser = new Parser(rfb, bufferList);
stream.addListener('data', function (data) {
bufferList.push(data);
});
stream.addListener('error', function (exception) {
rfb.errorCallback(exception);
});
stream.setNoDelay();
stream.connect(rfb.port, rfb.host);
this.send = function () {
var bList = new BufferList;
[].concat.apply([],arguments).forEach(function (arg) {
if (arg instanceof Buffer) {
bList.push(arg);
}
else {
var buf = new Buffer(arg.length);
buf.write(arg, 'binary');
bList.push(buf);
}
});
stream.write(bList.join());
return this;
};
this.end = function () {
stream.end();
return this;
};
this.sendKey = function (key, down) {
Put()
.word8(clientMsgTypes.keyEvent)
.word8(!!down)
.pad(2)
.word32be(key)
.send(this)
;
return this;
};
this.sendKeyDown = function (key) {
this.sendKey(key, 1);
return this;
};
this.sendKeyUp = function (key) {
this.sendKey(key, 0);
return this;
};
this.sendPointer = function (mask, x, y) {
Put()
.word8(clientMsgTypes.pointerEvent)
.word8(mask)
.word16be(x)
.word16be(y)
.send(this)
;
return this;
};
this.fbUpdateRequest = function (x, y, width, height, subscribe) {
Put()
.word8(clientMsgTypes.fbUpdate)
.word8(subscribe)
.word16be(x)
.word16be(y)
.word16be(width)
.word16be(height)
.send(this)
;
}
this.requestRedrawScreen = function () {
this.fbUpdateRequest(0, 0, this.fb.width, this.fb.height);
};
this.subscribeToScreenUpdates = function (x, y, width, height) {
this.fbUpdateRequest(x, y, width, height);
}
}
function Parser (rfb, bufferList) {
Binary(bufferList)
// version handshake
.getBuffer('prelude',12)
.tap(function (vars) {
var m = vars.prelude.toString().match(/^RFB (\d{3}\.\d{3})/);
if (!m) {
sys.log("Couldn't parse version handshake: " + vars.prelude);
this.clear();
}
else {
var version = Number(m[1]);
if (version < 3.008) {
sys.log('Remote version ' + version + ' < 3.008');
this.clear();
}
rfb.send('RFB 003.008\n');
}
})
.flush()
// security handshake
.getWord8('secLen')
.when('secLen', 0, function (vars) {
this
.clear()
.getWord8('msgLen')
.getBuffer('msg','msgLen')
.tap(function (vars) {
sys.log(
'Server returned error in security handshake: '
+ vars.msg.toString()
);
})
;
})
.getBuffer('secTypes','secLen')
.tap(function (vars) {
// vars.secTypes is a Buffer object; make an array
var secTypes = [];
for (var i = 0; i < vars.secTypes.length; i++) {
secTypes.push(vars.secTypes[i]);
}
var secNum = {
'none' : 1
}[rfb.securityType];
if (secTypes.indexOf(secNum) < 0) {
sys.log('Security type ' + rfb.securityType + ' not supported');
this.clear();
}
Put().word8(secNum).send(rfb);
})
.flush()
.getWord32be('secRes')
.unless('secRes', 0, function (vars) {
this
.clear()
.getWord8('msgLen')
.getBuffer('msg')
.tap(function (vars) {
sys.log('Security handshake failed with message: '
+ vars.msg.toString()
);
});
;
})
.flush()
// init handshake
.tap(function (vars) {
Put().word8(rfb.shared).send(rfb);
})
.getWord16be('fb.Width')
.getWord16be('fb.height')
.into('pf', function () {
this
.getWord8('bitsPerPixel')
.getWord8('depth')
.getWord8('bigEndianFlag')
.getWord8('trueColorFlag')
.getWord16be('redMax')
.getWord16be('greenMax')
.getWord16be('blueMax')
.getWord8('redShift')
.getWord8('geenShift')
.getWord8('blueShift')
})
.skip(3)
.getWord32be('nameLength')
.getBuffer('nameString', 'nameLength')
.tap(function (vars) {
rfb.fb.width = vars.fb.width;
rfb.fb.height = vars.fb.height;
Put()
.word8(clientMsgTypes.setEncodings)
.pad(1)
.word16be(2) // number of encodings following
.word32be(encodings.raw)
.word32be(encodings.copyRect)
.send(rfb)
;
})
.tap(function (vars) {
rfb.requestRedrawScreen();
rfb.subscribeToScreenUpdates(0, 0, vars.fb.width, vars.fb.Height)
})
.flush()
.forever(function (vars) {
this
.getWord8('serverMsgType')
.when('serverMsgType', serverMsgTypes.fbUpdate, function (vars) {
this
.skip(1)
.getWord16be('nRects')
.tap(function (vars) {
rfb.emit('startRects', vars.nRects);
})
.repeat('nRects', function (vars, i) {
this.into('rect', function () {
this
.tap(function (vars) { vars.emitter = 'unknownRect' })
.into('nRects',vars.nRects)
.into('index',i)
.getWord16be('x')
.getWord16be('y')
.getWord16be('width')
.getWord16be('height')
.getWord32be('encodingType')
.when('encodingType', encodings.raw, function (vars) {
this
.tap(function (vars) { vars.emitter = 'raw' })
.into('fbSize', vars.rect.width * vars.rect.height
* vars.pf.bitsPerPixel / 8
)
.getBuffer('fb','fbSize')
})
.when('encodingType', encodings.copyRect, function (vars) {
this
.tap(function (vars) { vars.emitter = 'copyRect' })
.getWord16be('srcX')
.getWord16be('srcY')
})
.tap(function (vars) {
rfb.emit(vars.emitter,vars.rect);
})
})
.flush();
})
.tap(function (vars) {
rfb.emit('endRects', vars.nRects);
});
})
/*
.when('serverMsgType', serverMsgTypes.setColorMap, function (vars) {
this
.tap(function (vars) { sys.log('setColorMap not implemented yet') })
})
.when('serverMsgType', serverMsgTypes.bell, function (vars) {
this
.tap(function (vars) { sys.log('bell not implemented yet') })
})
.when('serverMsgType', serverMsgTypes.cutText, function (vars) {
this
.tap(function (vars) { sys.log('cutText not implemented yet') })
})
*/
;
})
.end()
;
}