[Bug 2899] New: scp remote-to-remote does not work with IPv6 addresses anymore

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2899

            Bug ID: 2899
           Summary: scp remote-to-remote does not work with IPv6 addresses
                    anymore
           Product: Portable OpenSSH
           Version: 7.7p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: scp
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jjelen at redhat.com

Created attachment 3172
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3172&action=edit
proposed patch

Using IPv6 addresses for remote-to-remote transfers does not work
anymore. This worked fine in OpenSSH 7.4 and before.

  # scp -r -vvv jjelen@\[::1\]:/home/jjelen/Documents/abeceda.txt
jjelen@\[::1\]:/tmp/

fails with the error

  debug1: resolve_canonicalize: hostname  is an unrecognised address
  ssh: Could not resolve hostname : Name or service not known
  lost connection

This issue express itself earlier in the log as IPv6 address in the URI
that is not enclosed in the square brackets:

  Executing: /usr/bin/ssh -x -oClearAllForwardings=yes -t -v -v -v -l
jjelen -- ::1 scp -v -r /home/jjelen/Documents/abeceda.txt
jjelen@::1:/tmp/

This leads in the end to empty hostname:

  Executing: program /usr/bin/ssh host , user jjelen, command scp -v -r
-t :1:/tmp/

and to the error above.

This can be pretty simply addressed by the attached patch.

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