Node-FreeRDP

Node.JS addon for libfreerdp.

Dependencies

This requires the installation of libfreerdp 1.1.x.

On Mac:

brew tap untoldone/homebrew-x11
brew install untoldone/homebrew-x11/freerdp --devel

On Ubuntu (from 15.04 forward -- earlier Ubuntus used freerdp 1.0.x which wont work):

sudo apt install freerdp libfreerdp-dev

Installation

npm install freerdp

Features

This is based on FreeRDP. Any standard features of FreeRDP are supported as a result. Many flags you see on the command line version of xfreerdp are easily added to the current codebase if a desired functionality is missing from this Node.js wrapper library. This includes things such as Network Level Authentication (NLA) and clipboard redirection.

Example Usage

For the time being, this is the only API documentation available.

var freerdp = require('freerdp');

var session = new freerdp.Session({
  host: 'my.host',
  username: 'myuser',
  password: 'mypass',
  domain: 'mydomain', // optional
  port: 3389, // optional
  width: 1366, // optional
  height: 768, // optional
  certIgnore: true // optional
});

session.on('connect', function () {
  console.log('connected');

  var x = 10, y = 20; // if x / y are null, will not move mouse
  session.sendPointerEvent(x, y, {
    pressLeft: true // Other options are pressMiddle, pressRight, releaseLeft|Middle|Right
  });

  var code = 0x23; // letter 'H'
  var isPressed = true;
  session.sendKeyEventScancode(code, isPressed);

  setTimeout(function () {
    session.close(); // end session
  }, 50000);
});

session.on('bitmap', function (bitmap) {
  console.log(`bitmap at ${bitmap.x}, ${bitmap.y}, of dimensions ${bitmap.w}, ${bitmap.h}`);
  // bitmap.data contains RGBA buffer where each pixel is of bitmap.bytesPerPixel size
});

session.on('error', function (err) {
  
});

session.on('close', function () {
  console.log('connection closed');
});

session.connect();

Example of writing a current session screenshot to a png and pasting text

Install extra dependency for example with npm install canvas

var freerdp = require('freerdp');
var Canvas = require('canvas');
var fs = require('fs');

var canvas = new Canvas(1366, 768),
    ctx = canvas.getContext('2d');

var session = new freerdp.Session({
  host: 'my.host',
  username: 'myuser',
  password: 'mypass',
  domain: 'mydomain', // optional
  port: 3389, // optional
  width: 1366, // optional
  height: 768, // optional
  certIgnore: true // optional
});

session.on('connect', function () {
  setInterval(function () {
    var b = canvas.toBuffer();
    fs.writeFileSync('screenshot.png', b, 'binary');
  }, 1000);

  setTimeout(function () {
    // Set contents of local clipboard
    session.setClipboard("Hello World\n");
  }, 2500);

  setTimeout(function () {
    // Press paste hotkey sequence to initialize paste, pulling
    // the contents of local clipboard and pasting on the remote system.
    // Note this only works if the current focus supports this hotkey sequence
    // (focused on notepad, for example)
    session.sendKeyEventScancode(0x001d, true); // ctrl
    session.sendKeyEventScancode(0x002F, true); // v
    session.sendKeyEventScancode(0x002F, false);
    session.sendKeyEventScancode(0x001d, false);
  }, 3000);
})

session.on('bitmap', function (bitmap) {
  var imageData = ctx.createImageData(bitmap.w, bitmap.h);
  var dest = new Uint8ClampedArray(bitmap.w * bitmap.h * bitmap.bpp);
  var size = bitmap.w * bitmap.h * bitmap.bpp;
  // ARGB to RGBA
  for (var i = 0; i < bitmap.h; i++)
  {
    for (var j = 0; j < bitmap.w * 4; j += 4)
    {
      // ARGB <-> ABGR
      dest[(i * bitmap.bpp * bitmap.w) + j + 0] = bitmap.buffer[(i * bitmap.bpp * bitmap.w) + j + 2];
      dest[(i * bitmap.bpp * bitmap.w) + j + 1] = bitmap.buffer[(i * bitmap.bpp * bitmap.w) + j + 1];
      dest[(i * bitmap.bpp * bitmap.w) + j + 2] = bitmap.buffer[(i * bitmap.bpp * bitmap.w) + j + 0];
      dest[(i * bitmap.bpp * bitmap.w) + j + 3] = bitmap.buffer[(i * bitmap.bpp * bitmap.w) + j + 3];
    }
  }

  imageData.data.set(dest);

  ctx.putImageData(imageData, bitmap.x, bitmap.y);
});

setTimeout(function () { }, 10000); // prevent process from exiting

Roadmap

• Add better error handling
• There's almost certainly memory issues with the current implementation... investigate and fix if needed
• Find ways to funnel messages printed by libfreerdp to stdout to events