[Bug 195231] New: ssh tries AF_INET6 even when system is built with NO_INET6 [patch]

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195231

            Bug ID: 195231
           Summary: ssh tries AF_INET6 even when system is built with
                    NO_INET6 [patch]
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mi at ALDAN.algebra.com

Created attachment 149652
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149652&action=edit
Patch secure/usr.bin/ssh and crypto/openssh to skip IPv6 addresses

I build my world with NO_INET6 set -- until my ISP offers IPv6, there is just
no point.

After upgrading to 10.1, one of the cronjobs here started to generate (and
e-mail) a warning:

      socket: Address family not supported by protocol family

The warning comes from crypto/openssh/sshconnect.c and the attached patch shuts
it off. It seems necessary to patch the imported source (of OpenSSH), but I
can't think of another way to do it properly...

Maybe, the resolver should not return the AAAA-records on non-INET6 systems,
but that seems bogus: the records exist and the resolver ought to return them
without trying to foresee, how the caller might (mis)use them.

Please, review the attached patch. It changes the existing if into a switch
making it easier to #ifdef individual options later (some day we might have a
NO_INET4 option).

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