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

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c0a25aa92b612786f4e45292c4aee1d7d47123f8

commit c0a25aa92b612786f4e45292c4aee1d7d47123f8
Author: Florian Weimer <fweimer@redhat.com>
Date:   Sat Nov 11 11:51:08 2017 +0100

    resolv: More precise checks in res_hnok, res_dnok [BZ #22409] [BZ #22412]

    res_hnok rejected some host names used on the Internet, such as
    www-.example.com.  res_hnok and res_dnok failed to perform basic syntax
    checking on DNS domain names.

    Also fix res_mailok, res_ownok.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog             |   15 ++++
 NEWS                  |    3 +
 resolv/res_comp.c     |  208 +++++++++++++++++++++++++++---------------------
 resolv/tst-res_hnok.c |   28 +++++--
 4 files changed, 157 insertions(+), 97 deletions(-)

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