[Bug 255316] Use of a Link-local address in resolv.conf does not work

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255316

            Bug ID: 255316
           Summary: Use of a Link-local address in resolv.conf does not
                    work
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: bc979 at lafn.org

Created attachment 224347
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224347&action=edit
Suggested Patch

If /etc/resolv.conf has a link-local IPv6 address for the DNS server, then host
does not function even though ping works properly.  I have traced the problem
to /usr/src/contrib/unbound/libunbound/libunbound.c where the test for valid
characters does not accept the % or some of the following characters.

I have attached a patch which I believe resolves the problem, but am unable to
test it in the system as I was not able to figure out how to build host with
the updated file.  I am also not confident that there are other places that use
that lib that cannot handle the link-local addresses.

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