/// <summary>
/// Decode Bencoded torrent file and load internal dictionary from its contents
/// for later retrieval by other modules.
/// </summary>
public void Parse()
{
try
{
BNodeBase bNodeRoot = _Bencode.Decode(_metaInfoData);
GetStringOrNumeric(bNodeRoot, "announce");
GetListOfStrings(bNodeRoot, "announce-list");
GetStringOrNumeric(bNodeRoot, "comment");
GetStringOrNumeric(bNodeRoot, "created by");
GetStringOrNumeric(bNodeRoot, "creation date");
GetStringOrNumeric(bNodeRoot, "name");
GetStringOrNumeric(bNodeRoot, "piece length");
GetStringOrNumeric(bNodeRoot, "pieces");
GetStringOrNumeric(bNodeRoot, "private");
GetStringOrNumeric(bNodeRoot, "url-list");
if (_Bencode.GetDictionaryEntry(bNodeRoot, "files") == null)
{
GetStringOrNumeric(bNodeRoot, "length");
GetStringOrNumeric(bNodeRoot, "md5sum");
}
else
{
GetListOfDictionarys(bNodeRoot, "files");
}
CalculateInfoHash(bNodeRoot);
foreach (var key in metaInfoDict.Keys)
{
if ((key != "pieces") && (key != "info") && (key != "info hash"))
{
Log.Logger.Error($"{key}={Encoding.ASCII.GetString(metaInfoDict[key])}");
}
}
}
catch (Exception ex)
{
Log.Logger.Error(ex);
throw new BitTorrentException(ex.Message);
}
}
private readonly Bencode _Bencode; // Bencode encode/decode
/// <summary>
/// Decodes the announce request BEncoded response recieved from a tracker.
/// </summary>
/// <param name="announceResponse">Announce response.</param>
/// <param name="decodedResponse">Response.</param>
private void DecodeAnnounceResponse(Tracker tracker, byte[] announceResponse, ref AnnounceResponse decodedResponse)
{
if (announceResponse.Length != 0)
{
BNodeBase decodedAnnounce = _Bencode.Decode(announceResponse);
decodedResponse.statusMessage = _Bencode.GetDictionaryEntryString(decodedAnnounce, "failure reason");
if (decodedResponse.statusMessage != "")
{
decodedResponse.failure = true;
return; // If failure present then ignore rest of reply.
}
int.TryParse(_Bencode.GetDictionaryEntryString(decodedAnnounce, "complete"), out decodedResponse.complete);
int.TryParse(_Bencode.GetDictionaryEntryString(decodedAnnounce, "incomplete"), out decodedResponse.incomplete);
BNodeBase field = _Bencode.GetDictionaryEntry(decodedAnnounce, "peers");
if (field != null)
{
decodedResponse.peerList = new List <PeerDetails>();
if (field is BNodeString bNodeString) // Compact peer list reply
{
decodedResponse.peerList = tracker.GetCompactPeerList((bNodeString).str, 0);
}
else if (field is BNodeList bNodeList) // Non-compact peer list reply
{
foreach (var listItem in (bNodeList).list)
{
if (listItem is BNodeDictionary bNodeDictionary)
{
PeerDetails peer = new PeerDetails
{
infoHash = tracker.InfoHash
};
BNodeBase peerDictionaryItem = (bNodeDictionary);
BNodeBase peerField = _Bencode.GetDictionaryEntry(peerDictionaryItem, "ip");
if (peerField != null)
{
peer.ip = Encoding.ASCII.GetString(((BitTorrentLibrary.BNodeString)peerField).str);
}
if (peer.ip.Contains(":"))
{
peer.ip = peer.ip.Substring(peer.ip.LastIndexOf(":", StringComparison.Ordinal) + 1);
}
peerField = _Bencode.GetDictionaryEntry(peerDictionaryItem, "port");
if (peerField != null)
{
peer.port = int.Parse(Encoding.ASCII.GetString(((BitTorrentLibrary.BNodeNumber)peerField).number));
}
if (peer.ip != tracker.Ip) // Ignore self in peers list
{
Log.Logger.Trace($"(Tracker) Peer {peer.ip} Port {peer.port} found.");
decodedResponse.peerList.Add(peer);
}
}
}
}
}
int.TryParse(_Bencode.GetDictionaryEntryString(decodedAnnounce, "interval"), out decodedResponse.interval);
int.TryParse(_Bencode.GetDictionaryEntryString(decodedAnnounce, "min interval"), out decodedResponse.minInterval);
decodedResponse.trackerID = _Bencode.GetDictionaryEntryString(decodedAnnounce, "tracker id");
decodedResponse.statusMessage = _Bencode.GetDictionaryEntryString(decodedAnnounce, "warning message");
decodedResponse.announceCount++;
}
}