public async Task <FtpStreamChannel> OpenPassiveDataStreamAsync(FtpDataConnectionType connectionType, FtpRequest request)
{
FtpPassiveModeResponse reply;
if (connectionType == FtpDataConnectionType.EPSV || connectionType == FtpDataConnectionType.AutoPassive)
{
if (!(reply = await SetExtendedPassiveMode()).Success)
{
// if we're connected with IPv4 and data channel type is AutoPassive then fallback to IPv4
if (reply.Type == FtpResponseType.PermanentNegativeCompletion && connectionType == FtpDataConnectionType.AutoPassive && LocalEndPoint.Type == HostNameType.Ipv4)
{
return(await OpenPassiveDataStreamAsync(FtpDataConnectionType.PASV, request));
}
throw new FtpCommandException(reply);
}
}
else
{
if (LocalEndPoint.Type != HostNameType.Ipv4)
{
throw new FtpException("Only IPv4 is supported by the PASV command. Use EPSV instead.");
}
if (!(reply = await SetPassiveMode()).Success)
{
throw new FtpCommandException(reply);
}
}
var passiveConnection = new FtpStreamChannel();
await passiveConnection.ConnectAsync(reply.HostName, reply.ServiceName);
// NOTE: Maybe it is better to just to open the passive channel, and execute the command else where..
if (!(await ExecuteAsync <FtpResponse>(request)).Success)
{
passiveConnection.Dispose();
throw new FtpCommandException(reply);
}
return(passiveConnection);
}
/// <summary>
/// Disconnect from the server
/// </summary>
public async Task DisconnectAsync()
{
if (m_Stream == null || !m_Stream.IsConnected)
{
return;
}
try
{
await m_Stream.DisconnectAsync();
}
catch (IOException e)
{
System.Diagnostics.Debug.WriteLine("IOException thrown closing control connectin: " + e);
}
finally
{
m_Stream.Dispose();
}
}
