Reimplement:
4578. [security] Some chaining (CNAME or DNAME) responses to upstream
queries could trigger assertion failures.
(CVE-2017-3137) [RT #44734]
(cherry picked from commit f240f4a5de)
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@@ -21,6 +21,7 @@ a.short A 10.0.0.1
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short-dname DNAME short
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a.longlonglonglonglonglonglonglonglonglonglonglonglong A 10.0.0.2
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long-dname DNAME longlonglonglonglonglonglonglonglonglonglonglonglong
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toolong-dname DNAME longlonglonglonglonglonglonglonglonglonglonglonglong
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cname CNAME a.cnamedname
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cnamedname DNAME target
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a.target A 10.0.0.3
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