Module rdataclass

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DNS Rdata Classes.

Classes

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UnknownRdataclass
A DNS class is unknown.

Functions

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from_text(text)
Convert text into a DNS rdata class value.

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to_text(value)
Convert a DNS rdata type value to text.

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is_metaclass(rdclass)
True if the specified class is a metaclass.

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Variables

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RESERVED0 = 0

IN = 1

CH = 3

HS = 4

NONE = 254

ANY = 255

_by_text = {'ANY': 255, 'CH': 3, 'CHAOS': 3, 'HESIOD': 4, 'HS'...

_by_value = {0: 'RESERVED0', 1: 'IN', 3: 'CH', 4: 'HS', 254: '...

_metaclasses = {254: True, 255: True}

_unknown_class_pattern = re.compile(r'(?i)CLASS([0-9]+)$')

__package__ = 'dns'

Function Details

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from_text(text)

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Convert text into a DNS rdata class value.

The input text can be a defined DNS RR class mnemonic or instance of the DNS generic class syntax.

For example, "IN" and "CLASS1" will both result in a value of 1.

Raises ``dns.rdatatype.UnknownRdataclass`` if the class is unknown.

Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.

Returns an ``int``.

to_text(value)

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Convert a DNS rdata type value to text.

If the value has a known mnemonic, it will be used, otherwise the DNS generic class syntax will be used.

Raises ``ValueError`` if the rdata class value is not >= 0 and <= 65535.

Returns a ``str``.

is_metaclass(rdclass)

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True if the specified class is a metaclass.

The currently defined metaclasses are ANY and NONE.

*rdclass* is an ``int``.

Variables Details

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_by_text

Value:

{'ANY': 255,
 'CH': 3,
 'CHAOS': 3,
 'HESIOD': 4,
 'HS': 4,
 'IN': 1,
 'INTERNET': 1,
 'NONE': 254,
...

_by_value

Value:

{0: 'RESERVED0', 1: 'IN', 3: 'CH', 4: 'HS', 254: 'NONE', 255: 'ANY'}