[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 #8 from Marc Herbert <marc.herbert+mindrot at gmail.com> ---
Fun fact: ssh _does_ produce brackets for IPv6 addresses in
.ssh/known_hosts:

[review.openstack.org]:29418,[104.130.246.32]:29418 ssh-rsa
AAAAB3NzaC1yc2...
[review.openstack.org]:29418,[2001:4800:7819:103:be76:4eff:fe04:9229]:29418
ssh-rsa AAAAB3Nza...

But it can't parse back what it printed itself:

ssh ssh://[review.openstack.org]:29418                     OK
ssh ssh://[104.130.246.32]:29418                           OK
ssh ssh://[2001:4800:7819:103:be76:4eff:fe04:9229]:29418   FAIL with
usage message

OpenSSH_8.2p1, OpenSSL 1.1.1g  21 Apr 2020



Digression: with many operating systems using randomized IPv6 addresses
by default for privacy reasons, using ssh to .local systems on the same
LAN causes uncontrollable .ssh/know_hosts growth.

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