public void RemoveFromEmptyList()
{
var result = EncryptionTypes.Remove(new List <EncryptionType> (), EncryptionType.PlainText);
Assert.IsEmpty(result);
Assert.Throws <NotSupportedException> (() => result.Add(EncryptionType.PlainText));
}
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;
}
manager.Peers.ActivePeers.Add(id.Peer);
manager.Peers.ConnectedPeers.Add(id);
Interlocked.Increment(ref openConnections);
try {
// Create a handshake message to send to the peer
var handshake = new HandshakeMessage(manager.InfoHash, LocalPeerId, VersionInfo.ProtocolStringV100);
var preferredEncryption = EncryptionTypes.GetPreferredEncryption(id.Peer.AllowedEncryption, Settings.AllowedEncryption);
EncryptorFactory.EncryptorResult result = await EncryptorFactory.CheckOutgoingConnectionAsync(id.Connection, preferredEncryption, 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
if (id.Peer.AllowedEncryption.Contains(EncryptionType.PlainText))
{
id.Peer.AllowedEncryption = EncryptionTypes.PlainText;
}
else
{
id.Peer.AllowedEncryption = EncryptionTypes.None;
}
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);
manager.Mode.HandleMessage(id, handshake);
} catch {
// If we choose plaintext and it resulted in the connection being closed, remove it from the list.
id.Peer.AllowedEncryption = EncryptionTypes.Remove(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);
id.MessageQueue.SetReady();
TryProcessQueue(manager, id);
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;
}
}