Paul wrote (2021-05-20):

 PH> I'm looking for a way for BinkD to reject the incoming connection based on
 PH> something like SYS or ZYZ info presented. Is such a thing possible using a
 PH> perl script or similar?

 PH> Note I am not a perl guru so any suggested fix you have I'd appreciate a
 PH> bit of hand holding to implement it.

There is some documentation in doc/perlhooks.txt

I think it should be possible to abort the session:

  6) after_handshake()
     - called after complete login information transferred
     - defined vars: session level 2
     - return non-empty string to abort session with that reason

  Session Data

    This variables are set for session hooks depending of their availability:

                 1 2 3   <- session vars level (see hooks description)
    $sysname       + +   remote system name
    $sysop         + +   remote sysop



Have you built binkd with perl support?

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