Package dns :: Module rdata

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Module rdata

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DNS rdata.

Classes

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Rdata
Base class for all DNS rdata types.

GenericRdata
Generate Rdata Class

Functions

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string

_hexify(data, chunksize=32)
Convert a binary string into its hex encoding, broken up into chunks of chunksize characters separated by a space.

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string

_base64ify(data, chunksize=32)
Convert a binary string into its base64 encoding, broken up into chunks of chunksize characters separated by a space.

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string

_escapify(qstring)
Escape the characters in a quoted string which need it.

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string

_truncate_bitmap(what)
Determine the index of greatest byte that isn't all zeros, and return the bitmap that contains all the bytes less than that index.

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get_rdata_class(rdclass, rdtype)

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dns.rdata.Rdata instance

from_text(rdclass, rdtype, tok, origin=None, relativize=True)
Build an rdata object from text format.

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dns.rdata.Rdata instance

from_wire(rdclass, rdtype, wire, current, rdlen, origin=None)
Build an rdata object from wire format

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Variables

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_hex_chunksize = 32

_base64_chunksize = 32

__escaped = {'"': True, '\\': True}

dict _rdata_modules = {}
A dictionary mapping a (rdclass, rdtype) tuple to the module which implements that type.

string _module_prefix = 'dns.rdtypes'
The prefix to use when forming modules names.

__package__ = 'dns'

int _hex_chunk
At most this many octets that will be represented in each chunk of hexstring that _hexify() produces before whitespace occurs.

Function Details

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_hexify(data, chunksize=32)

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Convert a binary string into its hex encoding, broken up into chunks of chunksize characters separated by a space.

Parameters:

data (string) - the binary string
chunksize - the chunk size. Default is dns.rdata._hex_chunksize

Returns: string

_base64ify(data, chunksize=32)

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Convert a binary string into its base64 encoding, broken up into chunks of chunksize characters separated by a space.

Parameters:

data (string) - the binary string
chunksize - the chunk size. Default is dns.rdata._base64_chunksize

Returns: string

_escapify(qstring)

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Escape the characters in a quoted string which need it.

Parameters:

qstring (string) - the string

Returns: string

the escaped string

_truncate_bitmap(what)

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Determine the index of greatest byte that isn't all zeros, and return the bitmap that contains all the bytes less than that index.

Parameters:

what (string) - a string of octets representing a bitmap.

Returns: string

from_text(rdclass, rdtype, tok, origin=None, relativize=True)

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Build an rdata object from text format.

This function attempts to dynamically load a class which implements the specified rdata class and type. If there is no class-and-type-specific implementation, the GenericRdata class is used.

Once a class is chosen, its from_text() class method is called with the parameters to this function.

If tok is a string, then a tokenizer is created and the string is used as its input.

Parameters:

rdclass (int) - The rdata class
rdtype (int) - The rdata type
tok (dns.tokenizer.Tokenizer or string) - The tokenizer or input text
origin (dns.name.Name) - The origin to use for relative names
relativize (bool) - Should names be relativized?

Returns: dns.rdata.Rdata instance

from_wire(rdclass, rdtype, wire, current, rdlen, origin=None)

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Build an rdata object from wire format

This function attempts to dynamically load a class which implements the specified rdata class and type. If there is no class-and-type-specific implementation, the GenericRdata class is used.

Once a class is chosen, its from_wire() class method is called with the parameters to this function.

Parameters:

rdclass (int) - The rdata class
rdtype (int) - The rdata type
wire (string) - The wire-format message
current (int) - The offset in wire of the beginning of the rdata.
rdlen (int) - The length of the wire-format rdata
origin (dns.name.Name) - The origin to use for relative names

Returns: dns.rdata.Rdata instance

Variables Details

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_module_prefix

The prefix to use when forming modules names. The default is 'dns.rdtypes'. Changing this value will break the library.

Type:: string

Value:

'dns.rdtypes'