[Bug network/22412] New: res_dnok, res_hnok should perform syntax checks

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22412

            Bug ID: 22412
           Summary: res_dnok, res_hnok should perform syntax checks
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
            Blocks: 22409
  Target Milestone: ---

Currently, the name checking functions only check against character sets.  They
should try to parse the name as a domain name and verify that they are
syntactically valid names, following \ escaping rules and label/name length
limits.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=22409
[Bug 22409] res_hnok does not accept some host names used on the Internet
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