private void HandleAnnounceResponse(IPEndPoint endpoint, TrackerGetUdpEntry entry, byte[] data)
{
if (data.Length < 20)
{
context.CallPacketIgnored(endpoint, data.Length);
return;
}
if (Bytes.Equals(TrackerGetUdpProtocol.Announce, data, 0, 4) == false)
{
context.CallPacketIgnored(endpoint, data.Length);
return;
}
List <NetworkAddress> peers = new List <NetworkAddress>();
int intervalInSeconds = Bytes.ReadInt32(data, 8);
TimeSpan interval = TimeSpan.FromSeconds(intervalInSeconds);
int leechers = Bytes.ReadInt32(data, 12);
int seeders = Bytes.ReadInt32(data, 16);
for (int i = 20; i + 6 <= data.Length; i += 6)
{
int port = Bytes.ReadUInt16(data, i + 4);
StringBuilder address = new StringBuilder();
address.Append(data[i].ToString());
address.Append('.');
address.Append(data[i + 1].ToString());
address.Append('.');
address.Append(data[i + 2].ToString());
address.Append('.');
address.Append(data[i + 3].ToString());
if (port > 0)
{
peers.Add(new NetworkAddress(address.ToString(), port));
}
}
collection.Remove(entry.Transaction);
entry.Callback.Invoke(interval);
context.CallAnnounced(entry.Address, entry.Request.Hash, interval, seeders, leechers, peers.ToArray());
}
private TcpSocketReceiveCallback OnReceived(TrackerGetHttpEntry entry)
{
return(received =>
{
if (received.Status == SocketStatus.OK)
{
context.Queue.Add(() =>
{
byte[] data = Bytes.Copy(entry.Buffer.Data, entry.Buffer.Offset, received.Count);
string text = Encoding.ASCII.GetString(data);
context.CallPacketReceived(entry.Endpoint, data.Length);
if (text.StartsWith(TrackerGetHttpProtocol.ResponseHeader) == false)
{
context.CallPacketIgnored(entry.Endpoint, data.Length);
return;
}
int counter = 0, position = 0;
bool r = false, n = false;
for (int i = 0; i < data.Length; i++)
{
if (data[i] == '\r')
{
r = true;
counter++;
continue;
}
if (data[i] == '\n')
{
n = true;
counter++;
continue;
}
if (counter == 4 && r && n)
{
position = i;
break;
}
if (counter == 2 && !(r && n))
{
position = i;
break;
}
counter = 0;
}
if (position == 0)
{
context.CallPacketIgnored(entry.Endpoint, data.Length);
return;
}
BencodedValue decoded = Bencoder.Decode(data, position);
if (decoded.Dictionary == null)
{
context.CallPacketIgnored(entry.Endpoint, data.Length);
return;
}
string failure = decoded.Find("failure reason", x => x?.Text?.GetString());
if (failure != null)
{
context.CallFailed(entry.Address, entry.Request.Hash, failure);
return;
}
int?interval = decoded.Find("interval", x => x?.ToInt32());
BencodedValue peers = decoded.Find("peers", x => x);
if (interval != null && peers.Text != null && peers.Text.Length % 6 == 0)
{
List <NetworkAddress> result = new List <NetworkAddress>(peers.Text.Length / 6);
byte[] bytes = peers.Data.GetBytes();
for (int i = 0; i < bytes.Length; i += 6)
{
int port = Bytes.ReadUInt16(bytes, i + 4);
StringBuilder address = new StringBuilder();
address.Append(bytes[i].ToString());
address.Append('.');
address.Append(bytes[i + 1].ToString());
address.Append('.');
address.Append(bytes[i + 2].ToString());
address.Append('.');
address.Append(bytes[i + 3].ToString());
if (port > 0)
{
result.Add(new NetworkAddress(address.ToString(), port));
}
}
collection.Remove(entry.Socket);
entry.Callback.Invoke(TimeSpan.FromSeconds(interval.Value));
context.CallAnnounced(entry.Address, entry.Request.Hash, TimeSpan.FromSeconds(interval.Value), result.ToArray());
}
});
}
});
}