Implementing all 4 typical "messages" as in proftpd and other commercial FTP servers (taking over)

[fclairamb]

Taking over from #422

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 86.66%. Comparing base (ad78d02) to head (02469ea).

Files	Patch %	Lines
handle_misc.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #435      +/-   ##
==========================================
+ Coverage   86.49%   86.66%   +0.17%     
==========================================
  Files          11       11              
  Lines        1607     1620      +13     
==========================================
+ Hits         1390     1404      +14     
+ Misses        151      149       -2     
- Partials       66       67       +1     

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[fclairamb]

So @syncplify & @drakkan, what do you think about this?

This seems like a nice feature to add and a good time to create a new release.

[syncplify]

I agree. Apologies for mixing in the second change which should have been its own PR. You're right to drop that. I'll do a new and detailed PR once I have time to explore the observation @drakkan made about that. But the primary feature of this PR is highly desirable so I'd be very happy to see it included in your next release. Thanks.

[fclairamb]

To explain the little pull requests and branches I have pushed...

I have invested little time in it and faced a few issues.

• I made a working version and added this PR.
• The next day, I changed core parts of the testing code and faced some race conditions
• One week later (now) I tried to revert the code but now I have a problem with golangci-lint that won't even valide the same code push... And now I'm not sure how to proceed.

So now I try to understand why we have these differences:

• working commit 0aa7a8a
• failing commit 0aa7a8a

I suspect it's because of the golangci-lint's cache...