test wether the name sub falls under parent (i.e. is a subdomain
of parent). This function will return false if the given dnames are
equal.
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sub: the name to test
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parent: the parent's name
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Returns true if sub falls under parent, otherwise false
ldns_dname_str_absolute()
Checks whether the given dname string is absolute (i.e. ends with a '.')
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*dname_str: a string representing the dname
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Returns true or false
ldns_dname_label()
look inside the rdf and if it is an LDNS_RDF_TYPE_DNAME
try and retrieve a specific label. The labels are numbered
starting from 0 (left most).
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rdf: the rdf to look in
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labelpos: return the label with this number
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Returns a ldns_rdf* with the label as name or NULL on error
AUTHOR
The ldns team at NLnet Labs. Which consists out of
Jelte Jansen and Miek Gieben.