public void OnMessageSent(FileHash hash, PeerHash peer, byte[] payload)
{
BencodedValue bencoded = Bencoder.Decode(payload);
int? message = bencoded.Find("msg_type", x => x?.ToInt32());
int? piece = bencoded.Find("piece", x => x?.ToInt32());
int? size = bencoded.Find("total_size", x => x?.ToInt32());
if (message == 0 && piece != null)
{
hooks.CallMetadataRequestSent(hash, peer, piece.Value);
}
if (message == 1 && size != null)
{
hooks.CallMetadataMeasured(hash, peer, size.Value);
}
if (message == 1 && piece != null)
{
byte[] content = Bytes.Copy(payload, bencoded.Data.Length);
hooks.MetadataPieceSent(hash, peer, piece.Value, content);
}
if (message == 2 && piece != null)
{
hooks.CallMetadataRejectSent(hash, peer, piece.Value);
}
}
private static void FindEntriesValue(BencodedValue value, List <MetainfoEntry> entries)
{
string name = value.Find("name", x => x?.ToText(Encoding.UTF8));
long? size = value.Find("length", x => x?.ToInt64());
if (name != null && size != null)
{
entries.Add(new MetainfoEntry(name, size.Value));
}
}
private static void FindEntriesList(BencodedValue value, List <MetainfoEntry> entries)
{
BencodedValue files = value.Find("files", x => x);
if (files?.Array != null)
{
foreach (BencodedValue item in files.Array)
{
long? size = item.Find("length", x => x?.ToInt64());
BencodedValue path = item.Find("path", x => x);
if (size != null && path?.Array != null)
{
List <string> names = new List <string>();
foreach (BencodedValue name in path.Array)
{
names.Add(name.ToText(Encoding.UTF8));
}
entries.Add(new MetainfoEntry(names.ToArray(), size.Value));
}
}
}
}
private static void Handle(FileHash hash, PeerHash peer, byte[] payload, Action <FileHash, PeerHash, NetworkAddress[]> callback)
{
BencodedValue value = Bencoder.Decode(payload);
byte[] added = value.Find("added", x => x?.Data?.GetBytes());
List <NetworkAddress> peers = new List <NetworkAddress>();
if (added != null)
{
for (int i = 0; i < added.Length; i += 6)
{
string host = GetHost(added, i);
int port = GetPort(added, i);
if (port > 0)
{
peers.Add(new NetworkAddress(host, port));
}
}
}
if (added?.Length > 0)
{
callback(hash, peer, peers.ToArray());
}
}
private static MetainfoProperties FindProperties(BencodedValue value, MetainfoEntry[] entries, MetainfoHash[] pieces)
{
long totalSize = entries.Sum(x => x.Size);
int blockSize = 16384;
int pieceSize = value.Find("piece length", x => (int)x.ToInt64());
return(new MetainfoProperties(totalSize, pieces.Length, pieceSize, blockSize));
}
public void OnHandshake(FileHash hash, PeerHash peer, byte[] payload)
{
BencodedValue bencoded = Bencoder.Decode(payload);
int? size = bencoded.Find("metadata_size", x => x?.ToInt32());
if (size != null)
{
hooks.CallMetadataMeasured(hash, peer, size.Value);
}
}
private static MetainfoHash[] FindPieces(BencodedValue value)
{
byte[] data = value.Find("pieces", x => x.Data.GetBytes());
List <MetainfoHash> pieces = new List <MetainfoHash>();
for (int i = 0; i < data.Length; i += 20)
{
pieces.Add(new MetainfoHash(Bytes.Copy(data, i, 20)));
}
return(pieces.ToArray());
}
public static MetainfoFile FromFile(string path)
{
byte[] bytes = File.ReadAllBytes(path);
BencodedValue decoded = Bencoder.Decode(bytes);
BencodedValue info = decoded.Find("info", x => x);
Metainfo metainfo = DecodeMetainfo(info);
string[] trackers = FindTrackers(decoded);
return(new MetainfoFile(metainfo, trackers));
}
private static void FindTrackerValue(BencodedValue value, HashSet <string> trackers)
{
value.Find("announce", node =>
{
if (node != null)
{
trackers.Add(node.ToText());
}
return(node);
});
}
private static void FindTrackerList(BencodedValue value, HashSet <string> trackers)
{
value.Find("announce-list", node =>
{
if (node != null)
{
foreach (string text in node.AllTexts())
{
if (Uri.IsWellFormedUriString(text, UriKind.Absolute))
{
trackers.Add(text);
}
}
}
return(node);
});
}
private static void Decode(BencodedValue bencoded, IDictionary <byte, string> byId, IDictionary <string, byte> byCode)
{
BencodedValue received = bencoded.Find("m", x => x);
if (received?.Dictionary != null)
{
foreach (BencodedEntry entry in received.Dictionary)
{
byte? id = entry.Value?.Number?.ToByte();
string code = entry.Key?.Text?.GetString();
if (id != null && code != null)
{
byId.Add(id.Value, code.ToLower());
byCode.Add(code.ToLower(), id.Value);
}
}
}
}
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());
}
});
}
});
}