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�dd��Zdd� Zdd� Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � ZdS )!�Optionz%Base class for all EDNS option types.��otypec C s t �|�| _dS )z_Initialize an option.
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N)r �maker) )�selfr) r r r �__init__@ s zOption.__init__N��file�returnc C s t �dS )zUConvert an option to wire format.
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d�dd��Z� ZS )� ECSOptionz!EDNS Client Subnet (ECS, RFC7871)Nr )�address�srclen�scopelenc sR t � �tj� tj�|�}|tjkrjd| _ |du r6d}tj
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*scopelen*, an ``int``, the scope prefix length. This value
must be 0 in queries, and should be set in responses.
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>>>
>>> # basic example
>>> dns.edns.ECSOption.from_text('1.2.3.4/24')
>>>
>>> # also understands scope
>>> dns.edns.ECSOption.from_text('1.2.3.4/24/32')
>>>
>>> # IPv6
>>> dns.edns.ECSOption.from_text('2001:4b98::1/64/64')
>>>
>>> # it understands results from `dns.edns.ECSOption.to_text()`
>>> dns.edns.ECSOption.from_text('ECS 1.2.3.4/24/32')
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r� r8 r9 c C s t �| �} t| �}|�| |�S )a Build an EDNS option object from wire format.
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r� )r) r@ �current�olenr/ c C sF t j�||�}|�|�� t| |�W d � S 1 s80 Y dS )ar Build an EDNS option object from wire format.
*otype*, an ``int``, is the option type.
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of the rdata.
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Returns an instance of a subclass of ``dns.edns.Option``.
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