[Bug network/20592] New: DNS resource record type classification macros in <arpa/nameser.h> are incorrect

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

https://sourceware.org/bugzilla/show_bug.cgi?id=20592

            Bug ID: 20592
           Summary: DNS resource record type classification macros in
                    <arpa/nameser.h> are incorrect
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---

These macros do not reflect reality:

/* Exclusively a QTYPE? (not also an RTYPE) */
#define ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
                      (t) == ns_t_mailb || (t) == ns_t_maila)
/* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
#define ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
/* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
#define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
#define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
#define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
                       (t) == ns_t_zxfr)

Most implementations treat RR types in the range from 128 to 255 as meta-types.
 The meta-type concept is ill-defined (OPT and TSIG were allocated from outside
meta-type range, despite being meta-types).  It is wrong to hard-code this in a
macros, and the categorization itself is probably not helpful, either.

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