async void ReceiveAsync(UdpClient client, CancellationToken token)
{
while (!token.IsCancellationRequested)
{
try {
var result = await client.ReceiveAsync().ConfigureAwait(false);
var receiveString = Encoding.ASCII.GetString(result.Buffer);
var match = RegexMatcher.Match(receiveString);
if (!match.Success)
{
return;
}
int portcheck = Convert.ToInt32(match.Groups["port"].Value);
if (portcheck <= 0 || portcheck > 65535)
{
return;
}
var infoHash = InfoHash.FromHex(match.Groups["hash"].Value);
var uri = new Uri("ipv4://" + result.RemoteEndPoint.Address + ':' + portcheck);
PeerFound?.Invoke(this, new LocalPeerFoundEventArgs(infoHash, uri));
} catch {
}
}
}
async void ReceiveAsync(UdpClient client, CancellationToken token)
{
while (!token.IsCancellationRequested)
{
try {
UdpReceiveResult result = await client.ReceiveAsync().ConfigureAwait(false);
string[] receiveString = Encoding.ASCII.GetString(result.Buffer)
.Split(new[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
string portString = receiveString.FirstOrDefault(t => t.StartsWith("Port: ", StringComparison.Ordinal));
string hashString = receiveString.FirstOrDefault(t => t.StartsWith("Infohash: ", StringComparison.Ordinal));
string cookieString = receiveString.FirstOrDefault(t => t.StartsWith("cookie", StringComparison.Ordinal));
// An invalid response was received if these are missing.
if (portString == null || hashString == null)
{
continue;
}
// If we received our own cookie we can ignore the message.
if (cookieString != null && cookieString.Contains(Cookie))
{
continue;
}
// If the port is invalid, ignore it!
int portcheck = int.Parse(portString.Split(' ').Last());
if (portcheck <= 0 || portcheck > 65535)
{
continue;
}
var infoHash = InfoHash.FromHex(hashString.Split(' ').Last());
var uri = new Uri($"ipv4://{result.RemoteEndPoint.Address}{':'}{portcheck}");
PeerFound?.InvokeAsync(this, new LocalPeerFoundEventArgs(infoHash, uri));
} catch (FileNotFoundException) {
throw;
} catch {
}
}
}
public void RaisePeerFound(InfoHash infoHash, Uri uri) => PeerFound?.Invoke(this, new LocalPeerFoundEventArgs(infoHash, uri));
