I'm not sure where the book stands on scripts-as-software, but I've written a
set of scripts (that can run as a daemon or just as a scanning-only-tool) that
creates entries in /etc/hosts.deny for folks who have tcpwrappers-enabled SSH
servers running on public IPs:
https://github.com/qrux/deny-ssh
There the script that does the work, a script that "daemonizes" that one, and a
bootscript. Of course I know about DenyHosts (which inspired what I did), but
I dislike bloat, and a shell-script version appealed to me (and perhaps other
"minimalists" who use LFS/BLFS).
Q
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