PRT and EPRT don't respect the configured proxy

[TSRBerry]

FTP Server OS: Linux

FTP Server Type: Vsftpd

Client Computer OS: Arch Linux

FluentFTP Version: 49.0.2

Framework: .NET 8

Currently when you try to transfer files in active mode using FtpClientSocks5Proxy the client doesn't send a BIND request to the proxy server and instead listens on a random port on the client (as it should when no proxy is involved).

However when a SOCKS5 proxy is configured the client should send a request to the proxy server to open a port which could then be used for the data connection. Without this step the server tries to establish the data connection with the client directly, which might not be possible (the client could only be reachable over the proxy).

[FanDjango]

Nobody using active mode yet, I supppose.

[TSRBerry]

I was trying to integrate this client in my test suite for my SOCKS5 proxy library, which is how I noticed this issue.

[FanDjango]

Ok, that's fine. I have no real way to test proxy related stuff, so there is nothing much I can do right now.

[FanDjango]

The guy who initially contributed the proxy code is no longer in the loop, it appears.

[robinrodricks]

Do you have a good SOCKS5 proxy library @TSRBerry ? Is it better than our implementation?

[TSRBerry]

I am currently working on one, but it is not yet SOCKS5 compliant and the API is still unstable.

I have thought about adding bind support to your implementation, but I don't think my time budget would allow that for now.