I took the liberty of converting it to C# with a few minor modifications. It allows a user to specify a Port number manually.
WHY C#? Well why not? I'm using C# at work so it comes naturally. Mono gives me the ability to run code on both Windows and Linux. Yes, so does Java. There are a variety of tools out there and I like to familiarize myself with a good number of them. In this spirit, I am currently writing a small connection testing tool in Java using Swing. Maybe I'll write another port of Wake-On-LAN in C++ for fun.
Here is the C# code below:
using System;
using System.Net;
using System.Net.Sockets;
namespace WakeOnLan
{
class Program
{
static void Main (string[] args)
{
string macAdd = "";
string ip = "";
string port = "9";
int iPort = 0;
if (args.Length < 2) {
System.Console.WriteLine("Usage: wakeonlan <broadcast-ip> <mac-address> [<port>]");
System.Console.WriteLine("Example: wakeonlan 192.168.0.255 00:0D:61:08:22:4A");
System.Console.WriteLine("Example: wakeonlan 192.168.0.255 00-0D-61-08-22-4A");
System.Environment.Exit(1);
}
ip = args[0];
macAdd = args[1];
if (args.Length > 2)
port = args[2];
if (!IsNumeric(port))
{
System.Console.WriteLine("Port entered was not a number...");
return; // quit
}
iPort = Int32.Parse(port);
if (iPort > 65535 || iPort < 0)
{
System.Console.WriteLine("Port value is invalid");
return;
}
byte[] mac = getMacBytes(macAdd);
//byte[] mac = new byte[] { 0x00, 0x0F, 0x1F, 0x20, 0x2D, 0x35 };
WakeUp(mac, iPort, ip);
}
///
/// Check whether string can be converted to a number value
///
private static bool IsNumeric(string num)
{
try
{
double d = Double.Parse(num);
return true;
}
catch
{
return false;
}
}
///
/// Sends a Wake-On-Lan packet to the specified MAC address.
///
private static void WakeUp(byte[] mac, Int32 iPort, string myIP)
{
//
// WOL packet is sent over UDP 255.255.255.0:40000.
//
UdpClient client = new UdpClient();
client.Connect(myIP, iPort);
//
// WOL packet contains a 6-bytes trailer and 16 times a 6-bytes sequence
// containing the MAC address.
byte[] packet = new byte[17 * 6];
//
// Trailer of 6 times 0xFF.
//
for (int i = 0; i < 6; i++)
packet[i] = 0xFF;
//
// Body of magic packet contains 16 times the MAC address.
//
for (int i = 1; i <= 16; i++)
for (int j = 0; j < 6; j++)
packet[i * 6 + j] = mac[j];
//
// Submit WOL packet.
//
client.Send(packet, packet.Length);
System.Console.WriteLine("Wake-on-LAN packet sent.");
}
private static byte[] getMacBytes(String macStr)
{
byte[] bytes = new byte[6];
string[] hex = macStr.Split(new Char[] { ':', '-' });
if (hex.Length != 6) {
throw new ArgumentException("Invalid MAC address.");
}
try {
for (int i = 0; i < 6; i++) {
Int32 intVal = Int32.Parse(hex[i], System.Globalization.NumberStyles.AllowHexSpecifier);
bytes[i] = (byte)intVal;
}
}
catch (FormatException e) {
throw new ArgumentException("Invalid hex digit in MAC address.");
}
return bytes;
}
}
}
