[Bug 3139] New: Tunneling does not work on recent versions of macOS

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3139

            Bug ID: 3139
           Summary: Tunneling does not work on recent versions of macOS
           Product: Portable OpenSSH
           Version: 7.9p1
          Hardware: All
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Miscellaneous
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jamie.schnaitter at gmail.com

Support for it was already tenuous, as I am assuming it was using the
tuntaposx http://tuntaposx.sourceforge.net/ TUN/TAP driver which
appears to be defunct (it was hard to maintain and Apple is
"discouraging" development of KEXTs).

Darwin and thus macOS has had for a while "user tunnel" (utun)
pseudodevices, which could be a solution to this.  Several VPN packages
use this on macOS to provide their functionality, but I have not found
much about it in relation to OpenSSH.

utun operates in user mode and presents a socket rather than a
character device.  It is pretty well described in Chapter 17 of
http://newosxbook.com/MOXiI.pdf , especially from page 682 (PDF page
718)

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