[Bug 3284] New: ssh-keygen does not respect the syntax for hostname with -F option

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3284

            Bug ID: 3284
           Summary: ssh-keygen does not respect the syntax for hostname
                    with -F option
           Product: Portable OpenSSH
           Version: 8.4p1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: ssh-keygen
          Assignee: unassigned-bugs at mindrot.org
          Reporter: daniele at retaggio.net

Hi,

I've tested the bug in gentoo (openssh v8.4p1) and osx big sur (openssh
v8.1p1), still seems that i can't select more than one option in the
Version list.

OSX:
$ ssh -V
OpenSSH_8.1p1, LibreSSL 2.7.3
$
Gentoo:
$ ssh -V
OpenSSH_8.4p1, OpenSSL 1.1.1g  21 Apr 2020
$

>From the man page of ssh-keygen:
     -F hostname | [hostname]:port

I have hosts with ssh running on a different port, 
but for the sake of bug reproducer, let's remain on port 22.

I assume that the syntax is:
$ ssh-keygen -F 172.16.66.8:22

But, with the given syntax, port 22 and any other port fail

Example:
$ ssh-keygen -F 172.16.66.8:22 -v
$ echo $?
1

FWIW:
$ ssh-keygen -F [172.16.66.8]:22 -v
$ echo $?
1
$


Everything is working without any port specified:
$ ssh-keygen -F 172.16.66.8 -v
# Host 172.16.66.8 found: line 44
172.16.66.8 ecdsa-sha2-nistp256 [...]
$ echo $?
0

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