[Feature Request] - Timeouts for active data connection acceptance

[defanor]

Description

When active data connections are configured to be used, currently FtpStream waits for an incoming connection indefinitely, while it may never happen, leading to a program hanging. Would be nice if it was possible to set a timeout.

Changes

The following changes to the application are expected

• A data connection acceptance timeout setting and a handling of that setting.
• Perhaps a similar one for passive connections: currently there is the connect_timeout function for control channel connection, but data channel in passive mode always uses plain connect.

Implementation

Once a setting is introduced, select or something along those lines can be called with a timeout, only calling accept when there is something to accept. For passive mode, TcpStream::connect_timeout can be used, as for the control channel.

[defanor]

Thanks!