[Bug 3407] New: ssh-keyscan can't find hostname in 8.9 while finds in 8.8 (keygen or keyscan issue) when port is used

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3407

            Bug ID: 3407
           Summary: ssh-keyscan can't find hostname in 8.9 while finds in
                    8.8 (keygen or keyscan issue) when port is used
           Product: Portable OpenSSH
           Version: 8.9p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: ssh-keygen
          Assignee: unassigned-bugs at mindrot.org
          Reporter: arekm at maven.pl

Is ssh-keygen generating something incorrectly when port is used?

8.8p1 behaviour, find something when querying without port (but not
with port):

$ ssh-keyscan -p24 -H localhost > x
# localhost:24 SSH-2.0-OpenSSH_8.8
# localhost:24 SSH-2.0-OpenSSH_8.8
# localhost:24 SSH-2.0-OpenSSH_8.8
# localhost:24 SSH-2.0-OpenSSH_8.8
# localhost:24 SSH-2.0-OpenSSH_8.8

$ ssh-keygen -F localhost -f x
# Host localhost found: line 1
|1|bgKXcPS8/7Gu205qEvRPtD0keuo=|euMjJeWHk/lrQUj6FFKWs+PMuIs= ssh-rsa
AAAAB3NzaC1yc2EAAAABIwAAAQEA69uUvZ2ytAeV6j+K+XAUcg3VjHDcnCeMJhpHWfbjg19VreEhHF4Q9Mqma52rO7Ek3o2H6HtGoA9xFJkq0Qh8najATJXOgWu5j8Sce0BSHrSgBcjc9qSLFuB0scksc3GtaebNfVW2wkMN2bKIgcUYWr7PoegUb2mPCqA+/9uCNmcTkary7fzlNWGGwfkymqPgnEmQi95fYg3iGngbocmTPYAieQx95naeA2qmAflSo1CkA35uv7XYAHUGb4mM+h02rz8fTyYx6UFahDOMVdRDD5dXhwrqE8w6ZupKOzLgYNwvJsNW6c7iXcGijBSN24dn2KUGqVwHriq6oEei4Gbdpw==
# Host localhost found: line 2
|1|aSrZkQOhADoYhvmgw8uPQOSDxzk=|ddeO9drGbpfJmuiTUCWFtJT7i4w=
ecdsa-sha2-nistp256
AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAbLZGODREQwfd0w8DRhWZoBYgPnPWDfs7PeLxV+2CpJNTujVAmFUFBdjlIhb7WdtHaZZBV8b0r9X0Ky3qyoYuM=
# Host localhost found: line 3
|1|bm4X5CEL/A2V5NZwjlBC1ZGHcYA=|TYNkBmtPeFC+Zc3y292nEayiGAQ=
ssh-ed25519
AAAAC3NzaC1lZDI1NTE5AAAAILBcofK3yv+1Ypo1s4L2sJy9TOBietyTQGIBw+QE+I+F

$ ssh-keygen -F localhost:24 -f x
$

$ ssh -V
OpenSSH_8.8p1, OpenSSL 3.0.1 14 Dec 2021


and 8.9p1 behaviour, nothing is found in "with and without port"
variants:

$ ssh-keyscan -p24 -H localhost > x
# localhost:24 SSH-2.0-OpenSSH_8.9
# localhost:24 SSH-2.0-OpenSSH_8.9
# localhost:24 SSH-2.0-OpenSSH_8.9
# localhost:24 SSH-2.0-OpenSSH_8.9
# localhost:24 SSH-2.0-OpenSSH_8.9

$ ssh-keygen -F localhost -f x
$

$ ssh-keygen -F localhost:24 -f x
$

$ ssh -V
OpenSSH_8.9p1, OpenSSL 3.0.1 14 Dec 2021


Now 8.9p1 with x file generated with ssh-keygen 8.8p1 works like this:
ssh-keygen -F localhost -f x8.9

but 8.8p1 with x file generated by ssh-keygen 8.9p1 fails to find
anything.

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