Remote Windows Login

[Richardsmith]

Hello all,

I'm building a little java app for controlling computers on my work's computer classes.
It is quite easy for me to start/restart and power up the computers, but I don't know how to login the computers.
Do you happen to know a code I might use?

We are running Windows 7 with active directory.

Richard

[gimbal2]

... really? You can make computers power on remotely using Java? Amazing!

[SurfMan]

... really? You can make computers power on remotely using Java? Amazing!

I don't want to sound pedantic, but you can: just craft a proper Wake-on-Lan packet. I haven't tested this, but it looks like it does what it says on the box. A WoL packet is 6 times the MAC address so it looks legit :)

Source: Simple Java Implementation of Wake-on-LAN

import java.io.*;
import java.net.*;

public class WakeOnLan {
    
    public static final int PORT = 9;    
    
    public static void main(String[] args) {
        
        if (args.length != 2) {
            System.out.println("Usage: java WakeOnLan <broadcast-ip> <mac-address>");
            System.out.println("Example: java WakeOnLan 192.168.0.255 00:0D:61:08:22:4A");
            System.out.println("Example: java WakeOnLan 192.168.0.255 00-0D-61-08-22-4A");
            System.exit(1);
        }
        
        String ipStr = args[0];
        String macStr = args[1];
        
        try {
            byte[] macBytes = getMacBytes(macStr);
            byte[] bytes = new byte[6 + 16 * macBytes.length];
            for (int i = 0; i < 6; i++) {
                bytes[i] = (byte) 0xff;
            }
            for (int i = 6; i < bytes.length; i += macBytes.length) {
                System.arraycopy(macBytes, 0, bytes, i, macBytes.length);
            }
            
            InetAddress address = InetAddress.getByName(ipStr);
            DatagramPacket packet = new DatagramPacket(bytes, bytes.length, address, PORT);
            DatagramSocket socket = new DatagramSocket();
            socket.send(packet);
            socket.close();
            
            System.out.println("Wake-on-LAN packet sent.");
        }
        catch (Exception e) {
            System.out.println("Failed to send Wake-on-LAN packet: + e");
            System.exit(1);
        }
        
    }
    
    private static byte[] getMacBytes(String macStr) throws IllegalArgumentException {
        byte[] bytes = new byte[6];
        String[] hex = macStr.split("(\\:|\\-)");
        if (hex.length != 6) {
            throw new IllegalArgumentException("Invalid MAC address.");
        }
        try {
            for (int i = 0; i < 6; i++) {
                bytes[i] = (byte) Integer.parseInt(hex[i], 16);
            }
        }
        catch (NumberFormatException e) {
            throw new IllegalArgumentException("Invalid hex digit in MAC address.");
        }
        return bytes;
    }
    
   
}

[Richardsmith]

Yes!
But it would be even more amazing if I can manage my computer to fix me a cup of coffee...

[Richardsmith]

Thanks SurfMan!

Is this code to wake up the computer after shutdown or log in to windows?...

[SurfMan]

This code is to wake up the computer when it's powered off, if it supports Wake-on-Lan (WoL).

Maybe you can google for an RDP implementation in Java. NTLM authentication is another subject for authentication to Windows servers. I am not familiar with any of those.

[Richardsmith]

This code is to wake up the computer when it's powered off, if it supports Wake-on-Lan (WoL).

Maybe you can google for an RDP implementation in Java. NTLM authentication is another subject for authentication to Windows servers. I am not familiar with any of those.

OK, thanks. Your code does help since I don't have to use the program I found fort startup.
I hope I'll find the code for login.