async Task <bool> HandleHandshake(Peer peer, IConnection connection, HandshakeMessage message, IEncryption decryptor, IEncryption encryptor)
{
TorrentManager man = null;
if (message.ProtocolString != VersionInfo.ProtocolStringV100)
{
return(false);
}
// If we're forcing encrypted connections and this is in plain-text, close it!
if (encryptor is PlainTextEncryption && !Engine.Settings.AllowedEncryption.HasFlag(EncryptionTypes.PlainText))
{
return(false);
}
for (int i = 0; i < Engine.Torrents.Count; i++)
{
if (message.InfoHash == Engine.Torrents[i].InfoHash)
{
man = Engine.Torrents[i];
}
}
// We're not hosting that torrent
if (man == null)
{
return(false);
}
if (man.State == TorrentState.Stopped)
{
return(false);
}
if (!man.Mode.CanAcceptConnections)
{
return(false);
}
peer.PeerId = message.PeerId;
var id = new PeerId(peer, connection, man.Bitfield?.Clone().SetAll(false))
{
Decryptor = decryptor,
Encryptor = encryptor
};
message.Handle(man, id);
Logger.Log(id.Connection, "ListenManager - Handshake successful handled");
id.ClientApp = new Software(message.PeerId);
message = new HandshakeMessage(man.InfoHash, Engine.PeerId, VersionInfo.ProtocolStringV100);
await PeerIO.SendMessageAsync(id.Connection, id.Encryptor, message, man.UploadLimiters, id.Monitor, man.Monitor);
Engine.ConnectionManager.IncomingConnectionAccepted(man, id);
return(true);
}
private async Task <bool> HandleHandshake(PeerId id, HandshakeMessage message)
{
TorrentManager man = null;
if (message.ProtocolString != VersionInfo.ProtocolStringV100)
{
return(false);
}
// If we're forcing encrypted connections and this is in plain-text, close it!
if (id.Encryptor is PlainTextEncryption && !engine.Settings.AllowedEncryption.HasFlag(EncryptionTypes.PlainText))
{
return(false);
}
for (int i = 0; i < engine.Torrents.Count; i++)
{
if (message.infoHash == engine.Torrents[i].InfoHash)
{
man = engine.Torrents[i];
}
}
// We're not hosting that torrent
if (man == null)
{
return(false);
}
if (man.State == TorrentState.Stopped)
{
return(false);
}
if (!man.Mode.CanAcceptConnections)
{
return(false);
}
id.Peer.PeerId = message.PeerId;
id.TorrentManager = man;
message.Handle(id);
Logger.Log(id.Connection, "ListenManager - Handshake successful handled");
id.ClientApp = new Software(message.PeerId);
message = new HandshakeMessage(id.TorrentManager.InfoHash, engine.PeerId, VersionInfo.ProtocolStringV100);
await PeerIO.SendMessageAsync(id.Connection, id.Encryptor, message, id.TorrentManager.UploadLimiter, id.Monitor, id.TorrentManager.Monitor);
engine.ConnectionManager.IncomingConnectionAccepted(id);
return(true);
}
private async void EndCheckEncryption(PeerId id, byte[] initialData)
{
try
{
if (initialData != null && initialData.Length > 0)
{
throw new EncryptionException("unhandled initial data");
}
EncryptionTypes e = engine.Settings.AllowedEncryption;
if (id.Encryptor is RC4 && !Toolbox.HasEncryption(e, EncryptionTypes.RC4Full) ||
id.Encryptor is RC4Header && !Toolbox.HasEncryption(e, EncryptionTypes.RC4Header) ||
id.Encryptor is PlainTextEncryption && !Toolbox.HasEncryption(e, EncryptionTypes.PlainText))
{
CleanupSocket(id, id.Encryptor.GetType().Name + " encryption is not enabled");
}
else
{
// Create a handshake message to send to the peer
var handshake = new HandshakeMessage(id.TorrentManager.InfoHash, engine.PeerId, VersionInfo.ProtocolStringV100);
await PeerIO.SendMessageAsync(id.Connection, id.Encryptor, handshake, id.TorrentManager.UploadLimiter, id.Monitor, id.TorrentManager.Monitor);
// Receive their handshake
handshake = await PeerIO.ReceiveHandshakeAsync(id.Connection, id.Decryptor);
handshake.Handle(id);
// If there are any pending messages, send them otherwise set the queue
// processing as finished.
if (id.QueueLength > 0)
{
ProcessQueue(id);
}
else
{
id.ProcessingQueue = false;
}
ReceiveMessagesAsync(id.Connection, id.Decryptor, id.TorrentManager.DownloadLimiter, id.Monitor, id.TorrentManager, id);
// Alert the engine that there is a new usable connection
id.TorrentManager.HandlePeerConnected(id, Direction.Outgoing);
}
}
catch
{
id.Peer.Encryption &= ~EncryptionTypes.RC4Full;
id.Peer.Encryption &= ~EncryptionTypes.RC4Header;
CleanupSocket(id, "Failed encryptor check");
}
}
internal async void ProcessNewOutgoingConnection(PeerId id)
{
// If we have too many open connections, close the connection
if (OpenConnections > MaxOpenConnections)
{
CleanupSocket(id);
return;
}
// The peer is no longer in the 'ConnectingToPeers' list, so we should
// add it immediately to the 'Connected' list so it is always in one of
// the lists.
id.ProcessingQueue = true;
id.TorrentManager.Peers.ActivePeers.Add(id.Peer);
id.TorrentManager.Peers.ConnectedPeers.Add(id);
try {
// Increase the count of the "open" connections
var result = await EncryptorFactory.CheckOutgoingConnectionAsync(id.Connection, id.Peer.AllowedEncryption, engine.Settings, id.TorrentManager.InfoHash);
id.Decryptor = result.Decryptor;
id.Encryptor = result.Encryptor;
} catch {
// If an exception is thrown it's because we tried to establish an encrypted connection and something went wrong
id.Peer.AllowedEncryption &= ~(EncryptionTypes.RC4Full | EncryptionTypes.RC4Header);
id.TorrentManager.RaiseConnectionAttemptFailed(new ConnectionAttemptFailedEventArgs(id.Peer, ConnectionFailureReason.EncryptionNegiotiationFailed, id.TorrentManager));
CleanupSocket(id);
return;
}
try {
// Create a handshake message to send to the peer
var handshake = new HandshakeMessage(id.TorrentManager.InfoHash, engine.PeerId, VersionInfo.ProtocolStringV100);
await PeerIO.SendMessageAsync(id.Connection, id.Encryptor, handshake, id.TorrentManager.UploadLimiter, id.Monitor, id.TorrentManager.Monitor);
// Receive their handshake
handshake = await PeerIO.ReceiveHandshakeAsync(id.Connection, id.Decryptor);
handshake.Handle(id);
} catch {
// If we choose plaintext and it resulted in the connection being closed, remove it from the list.
id.Peer.AllowedEncryption &= ~id.EncryptionType;
id.TorrentManager.RaiseConnectionAttemptFailed(new ConnectionAttemptFailedEventArgs(id.Peer, ConnectionFailureReason.HandshakeFailed, id.TorrentManager));
CleanupSocket(id);
return;
}
try {
id.TorrentManager.HandlePeerConnected(id);
// If there are any pending messages, send them otherwise set the queue
// processing as finished.
if (id.QueueLength > 0)
{
ProcessQueue(id);
}
else
{
id.ProcessingQueue = false;
}
ReceiveMessagesAsync(id.Connection, id.Decryptor, id.TorrentManager.DownloadLimiter, id.Monitor, id.TorrentManager, id);
id.WhenConnected.Restart();
id.LastBlockReceived.Restart();
} catch {
id.TorrentManager.RaiseConnectionAttemptFailed(new ConnectionAttemptFailedEventArgs(id.Peer, ConnectionFailureReason.Unknown, id.TorrentManager));
CleanupSocket(id);
return;
}
}
private void handleHandshake(PeerId id, HandshakeMessage message)
{
TorrentManager man = null;
try
{
if (message.ProtocolString != VersionInfo.ProtocolStringV100)
{
throw new ProtocolException("Invalid protocol string in handshake");
}
}
catch (Exception ex)
{
Logger.Log(id.Connection, ex.Message);
id.Connection.Dispose();
return;
}
ClientEngine.MainLoop.QueueWait((MainLoopTask) delegate {
for (int i = 0; i < engine.Torrents.Count; i++)
{
if (message.infoHash == engine.Torrents[i].InfoHash)
{
man = engine.Torrents[i];
}
}
});
//FIXME: #warning FIXME: Don't stop the message loop until Dispose() and track all incoming connections
if (man == null) // We're not hosting that torrent
{
Logger.Log(id.Connection, "ListenManager - Handshake requested nonexistant torrent");
id.Connection.Dispose();
return;
}
if (man.State == TorrentState.Stopped)
{
Logger.Log(id.Connection, "ListenManager - Handshake requested for torrent which is not running");
id.Connection.Dispose();
return;
}
if (!man.Mode.CanAcceptConnections)
{
Logger.Log(id.Connection, "ListenManager - Current mode does not support connections");
id.Connection.Dispose();
return;
}
id.Peer.PeerId = message.PeerId;
id.TorrentManager = man;
// If the handshake was parsed properly without encryption, then it definitely was not encrypted. If this is not allowed, abort
if ((id.Encryptor is PlainTextEncryption && !Toolbox.HasEncryption(engine.Settings.AllowedEncryption, EncryptionTypes.PlainText)) && ClientEngine.SupportsEncryption)
{
Logger.Log(id.Connection, "ListenManager - Encryption is required but was not active");
id.Connection.Dispose();
return;
}
message.Handle(id);
Logger.Log(id.Connection, "ListenManager - Handshake successful handled");
id.ClientApp = new Software(message.PeerId);
message = new HandshakeMessage(id.TorrentManager.InfoHash, engine.PeerId, VersionInfo.ProtocolStringV100);
var callback = engine.ConnectionManager.incomingConnectionAcceptedCallback;
PeerIO.EnqueueSendMessage(id.Connection, id.Encryptor, message, id.TorrentManager.UploadLimiter,
id.Monitor, id.TorrentManager.Monitor, callback, id);
}
private void HandleHandshake(PeerId id, HandshakeMessage message)
{
TorrentManager man = null;
try
{
if (message.ProtocolString != VersionInfo.ProtocolStringV100)
throw new ProtocolException("Invalid protocol string in handshake");
}
catch (Exception ex)
{
Logger.Log(id.Connection, ex.Message);
id.Connection.Dispose();
return;
}
ClientEngine.MainLoop.QueueWait(() =>
{
foreach (var torrentManager in _engine.Torrents.Where(tm => message.InfoHash == tm.InfoHash))
man = torrentManager;
});
//FIXME: #warning FIXME: Don't stop the message loop until Dispose() and track all incoming connections
if (man == null) // We're not hosting that torrent
{
Logger.Log(id.Connection, "ListenManager - Handshake requested nonexistant torrent");
id.Connection.Dispose();
return;
}
if (man.State == TorrentState.Stopped)
{
Logger.Log(id.Connection, "ListenManager - Handshake requested for torrent which is not running");
id.Connection.Dispose();
return;
}
if (!man.Mode.CanAcceptConnections)
{
Logger.Log(id.Connection, "ListenManager - Current mode does not support connections");
id.Connection.Dispose();
return;
}
id.Peer.PeerId = message.PeerId;
id.TorrentManager = man;
// If the handshake was parsed properly without encryption, then it definitely was not encrypted. If this is not allowed, abort
if ((id.Encryptor is PlainTextEncryption &&
!Toolbox.HasEncryption(_engine.Settings.AllowedEncryption, EncryptionTypes.PlainText)) &&
ClientEngine.SupportsEncryption)
{
Logger.Log(id.Connection, "ListenManager - Encryption is required but was not active");
id.Connection.Dispose();
return;
}
message.Handle(id);
Logger.Log(id.Connection, "ListenManager - Handshake successful handled");
id.ClientApp = new Software(message.PeerId);
message = new HandshakeMessage(id.TorrentManager.InfoHash, _engine.PeerId, VersionInfo.ProtocolStringV100);
var callback = _engine.ConnectionManager.IncomingConnectionAcceptedCallback;
PeerIO.EnqueueSendMessage(id.Connection, id.Encryptor, message, id.TorrentManager.UploadLimiter,
id.Monitor, id.TorrentManager.Monitor, callback, id);
}
internal async void ProcessNewOutgoingConnection(TorrentManager manager, PeerId id)
{
// If we have too many open connections, close the connection
if (OpenConnections > MaxOpenConnections)
{
CleanupSocket(manager, id);
return;
}
id.ProcessingQueue = true;
manager.Peers.ActivePeers.Add(id.Peer);
manager.Peers.ConnectedPeers.Add(id);
try {
// Create a handshake message to send to the peer
var handshake = new HandshakeMessage(manager.InfoHash, LocalPeerId, VersionInfo.ProtocolStringV100);
EncryptorFactory.EncryptorResult result = await EncryptorFactory.CheckOutgoingConnectionAsync(id.Connection, id.Peer.AllowedEncryption, Settings, manager.InfoHash, handshake);
id.Decryptor = result.Decryptor;
id.Encryptor = result.Encryptor;
} catch {
// If an exception is thrown it's because we tried to establish an encrypted connection and something went wrong
id.Peer.AllowedEncryption &= ~(EncryptionTypes.RC4Full | EncryptionTypes.RC4Header);
manager.RaiseConnectionAttemptFailed(new ConnectionAttemptFailedEventArgs(id.Peer, ConnectionFailureReason.EncryptionNegiotiationFailed, manager));
CleanupSocket(manager, id);
// CleanupSocket will contain the peer only if AllowedEncryption is not set to None. If
// the peer was re-added, then we should try to reconnect to it immediately to try an
// unencrypted connection.
if (manager.Peers.AvailablePeers.Remove(id.Peer))
{
ConnectToPeer(manager, id.Peer);
}
return;
}
try {
// Receive their handshake
HandshakeMessage handshake = await PeerIO.ReceiveHandshakeAsync(id.Connection, id.Decryptor);
handshake.Handle(manager, id);
} catch {
// If we choose plaintext and it resulted in the connection being closed, remove it from the list.
id.Peer.AllowedEncryption &= ~id.EncryptionType;
manager.RaiseConnectionAttemptFailed(new ConnectionAttemptFailedEventArgs(id.Peer, ConnectionFailureReason.HandshakeFailed, manager));
CleanupSocket(manager, id);
// CleanupSocket will contain the peer only if AllowedEncryption is not set to None. If
// the peer was re-added, then we should try to reconnect to it immediately to try an
// encrypted connection, assuming the previous connection was unencrypted and it failed.
if (manager.Peers.AvailablePeers.Remove(id.Peer))
{
ConnectToPeer(manager, id.Peer);
}
return;
}
try {
if (id.BitField.Length != manager.Bitfield.Length)
{
throw new TorrentException($"The peer's bitfield was of length {id.BitField.Length} but the TorrentManager's bitfield was of length {manager.Bitfield.Length}.");
}
manager.HandlePeerConnected(id);
// If there are any pending messages, send them otherwise set the queue
// processing as finished.
if (id.QueueLength > 0)
{
ProcessQueue(manager, id);
}
else
{
id.ProcessingQueue = false;
}
ReceiveMessagesAsync(id.Connection, id.Decryptor, manager.DownloadLimiters, id.Monitor, manager, id);
id.WhenConnected.Restart();
id.LastBlockReceived.Restart();
} catch {
manager.RaiseConnectionAttemptFailed(new ConnectionAttemptFailedEventArgs(id.Peer, ConnectionFailureReason.Unknown, manager));
CleanupSocket(manager, id);
return;
}
}
