UDP Tracker not responding
- by kelton52
Alright, so I'm trying to connect to UDP trackers using c#, but I never get a response. I also don't get any errors. Here's my code.
namespace UDPTester
{
class MainClass
{
public static bool messageReceived = false;
public static Random Random = new Random();
public static void LOG(string format, params object[] args)
{
Console.WriteLine (format,args);
}
public static void Main (string[] args)
{
LOG ("Creating Packet...");
byte[] packet;
using(var stream = new MemoryStream())
{
var bc = new MiscUtil.Conversion.BigEndianBitConverter();
using(var br = new MiscUtil.IO.EndianBinaryWriter(bc,stream))
{
LOG ("Magic Num: {0}",(Int64)0x41727101980);
br.Write (0x41727101980);
br.Write((Int32)0);
br.Write ((Int32)Random.Next());
packet = stream.ToArray();
LOG ("Packet Size: {0}",packet.Length);
}
}
LOG ("Connecting to tracker...");
var client = new System.Net.Sockets.UdpClient("tracker.openbittorrent.com",80);
UdpState s = new UdpState();
s.e = client.Client.RemoteEndPoint;
s.u = client;
StartReceiving(s);
LOG ("Sending Packet...");
client.Send(packet,packet.Length);
while(!messageReceived)
{
Thread.Sleep(1000);
}
LOG ("Ended");
}
public static void StartReceiving(UdpState state)
{
state.u.BeginReceive(ReceiveCallback,state);
}
public static void ReceiveCallback(IAsyncResult ar)
{
UdpClient u = (UdpClient)((UdpState)(ar.AsyncState)).u;
IPEndPoint e = (IPEndPoint)((UdpState)(ar.AsyncState)).e;
Byte[] receiveBytes = u.EndReceive(ar, ref e);
string receiveString = Encoding.ASCII.GetString(receiveBytes);
LOG("Received: {0}", receiveString);
messageReceived = true;
StartReceiving((UdpState)ar.AsyncState);
}
}
public class UdpState
{
public UdpClient u;
public EndPoint e;
}
}
I was using a normal BinaryWriter, but that didn't work, and I read somewhere that it wants it's data in BigEndian.
This doesn't work for any of the UDP trackers I've found, any ideas why I'm not getting a response? Did they maybe change the protocol and not tell anyone? HTTP trackers all work fine.
Trackers I've tried
udp://tracker.publicbt.com:80
udp://tracker.ccc.de:80
udp://tracker.istole.it:80
Also, I'm not interested in using MonoTorrent(and when I was using it, the UDP didn't work anyways).
Protocol Sources
http://xbtt.sourceforge.net/udp_tracker_protocol.html
http://www.rasterbar.com/products/libtorrent/udp_tracker_protocol.html
