[Bug 1602] ssh: doesn't handle IPv6 addresses with brackets

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1602

--- Comment #6 from Marc Herbert <marc.herbert+mindrot at gmail.com> ---
Just did some more testing with OpenSSH_8.1p1 Apr 2020. It looks like
someone did the work to implement a new ssh://[brackets] syntax except
in the case where brackets are actually needed. Baffling.

So these now work:

 ssh ssh://[host.local]:23
 ssh ssh://[192.168.1.1]:22

Nice, but apparently pointless because no idea why anyone would use
brackets with IPv4 or hostnames. These work too:

 ssh ssh://host.local:23
 ssh ssh://192.168.1.1:22


Back to this bug, all these fail with the usage message:

  ssh ssh://[2001:db8:1234::1]
  ssh ssh://[2001:db8:1234::1]:22
  ssh ssh://2001:db8:1234::1

As before, these all fail with "Name or service not known"

  ssh [2001:db8:1234]
  ssh [2001:db8:1234]:22


https://tools.ietf.org/html/rfc2732 Format for Literal IPv6 Addresses
in URL's

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