On Tue, 9 Feb 2021 at 19:05, Jochen Bern <Jochen.Bern@xxxxxxxxx> wrote:
[...]
> Out of interest, what *purpose* is the obtained hostname being used for?
For the case that started this thread, it's used for expanding "%"
tokens in the config file. From ssh_config(5):
TOKENS
Arguments to some keywords can make use of tokens, which are expanded at
runtime:
[...]
%L The local hostname.
%l The local hostname, including the domain name.
These can be used by various keywords, typically for file paths (for
example, if you want to make a ControlPath unique to a hostname). I'd
have to check the code history to figure out where each token
originally came from, but I made them all more or less consistent
between the 8.2 and 8.3 releases.
> Does OpenSSH actually *need* it to be a) unique, b) reproducible, and/or
> c) a proper FQDN
Depends on what the user uses them for, but typically as long as
they're reproducible and unique within a set of machines that share a
filesystem it would likely be sufficient.
--
Darren Tucker (dtucker at dtucker.net)
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860 37F4 9357 ECEF 11EA A6FA (new)
Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
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