[Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver

["pasky at suse dot cz" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12684

           Summary: Multi-request DNS lookups do not properly fall back to
                    secondary nameserver
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: pasky@suse.cz


Created attachment 5678
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5678
proposed patch

The resolver does not properly handle a case where AF_UNSPEC query is started,
two requests are therefore dispatched, and something like NOTIMP or SERVFAIL is
returned to one of them (e.g. AF_INET6). In this case, the second nameserver in
queue is not queried even though it should be. It is caused by an omission of
resplen = 0 in the appropriate branch of send_dg() - therefore, when checking
whether next nameserver should be queried, it is assumed that a proper reply
was received from the first one.

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