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__init__.cpython-310.pyc
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_asyncbackend.cpython-310.pyc
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_asyncio_backend.cpython-310.p...
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_curio_backend.cpython-310.pyc
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_immutable_attr.cpython-310.py...
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_immutable_ctx.cpython-310.pyc
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_trio_backend.cpython-310.pyc
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asyncbackend.cpython-310.pyc
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asyncquery.cpython-310.pyc
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asyncresolver.cpython-310.pyc
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dnssec.cpython-310.pyc
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e164.cpython-310.pyc
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edns.cpython-310.pyc
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entropy.cpython-310.pyc
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enum.cpython-310.pyc
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exception.cpython-310.pyc
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flags.cpython-310.pyc
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grange.cpython-310.pyc
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immutable.cpython-310.pyc
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inet.cpython-310.pyc
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ipv4.cpython-310.pyc
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ipv6.cpython-310.pyc
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message.cpython-310.pyc
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name.cpython-310.pyc
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namedict.cpython-310.pyc
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node.cpython-310.pyc
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opcode.cpython-310.pyc
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query.cpython-310.pyc
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rcode.cpython-310.pyc
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rdata.cpython-310.pyc
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rdataclass.cpython-310.pyc
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rdataset.cpython-310.pyc
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rdatatype.cpython-310.pyc
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renderer.cpython-310.pyc
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resolver.cpython-310.pyc
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reversename.cpython-310.pyc
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rrset.cpython-310.pyc
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serial.cpython-310.pyc
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set.cpython-310.pyc
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tokenizer.cpython-310.pyc
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transaction.cpython-310.pyc
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tsig.cpython-310.pyc
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tsigkeyring.cpython-310.pyc
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ttl.cpython-310.pyc
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update.cpython-310.pyc
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version.cpython-310.pyc
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versioned.cpython-310.pyc
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wire.cpython-310.pyc
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xfr.cpython-310.pyc
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zone.cpython-310.pyc
31.1
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zonefile.cpython-310.pyc
6.86
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Code Editor : renderer.cpython-310.pyc
o f9__" � @ s^ d Z ddlZddlZddlZddlZddlZddlZddlZdZ dZ dZ dZ G dd� d�Z dS )z*Help for building DNS wire format messages� N� � � c @ s� e Zd ZdZd dd�Zdd� Zd d � Zejd d � �Z e j j fd d�Z dd� Zdd� Zd dd�Ze jjfdd�Ze jjfdd�Zdd� Zdd � Zd d � ZdS )!�Renderera� Helper class for building DNS wire-format messages. Most applications can use the higher-level L{dns.message.Message} class and its to_wire() method to generate wire-format messages. This class is for those applications which need finer control over the generation of messages. Typical use:: r = dns.renderer.Renderer(id=1, flags=0x80, max_size=512) r.add_question(qname, qtype, qclass) r.add_rrset(dns.renderer.ANSWER, rrset_1) r.add_rrset(dns.renderer.ANSWER, rrset_2) r.add_rrset(dns.renderer.AUTHORITY, ns_rrset) r.add_edns(0, 0, 4096) r.add_rrset(dns.renderer.ADDTIONAL, ad_rrset_1) r.add_rrset(dns.renderer.ADDTIONAL, ad_rrset_2) r.write_header() r.add_tsig(keyname, secret, 300, 1, 0, '', request_mac) wire = r.get_wire() output, an io.BytesIO, where rendering is written id: the message id flags: the message flags max_size: the maximum size of the message origin: the origin to use when rendering relative names compress: the compression table section: an int, the section currently being rendered counts: list of the number of RRs in each section mac: the MAC of the rendered message (if TSIG was used) Nr � c C sf t �� | _|du rt�dd�| _n|| _|| _|| _|| _i | _ t | _ g d�| _ | j� d� d| _dS )zInitialize a new renderer.Nr r )r r r r s � )�io�BytesIO�output�random�randint�id�flags�max_size�origin�compress�QUESTION�section�counts�write�mac)�selfr r r r � r �./usr/lib/python3/dist-packages/dns/renderer.py�__init__M s zRenderer.__init__c C sV | j �|� | j �� g }| j�� D ] \}}||kr |�|� q|D ]}| j|= q"dS )z�Truncate the output buffer at offset *where*, and remove any compression table entries that pointed beyond the truncation point. N)r �seek�truncater �items�append)r �where�keys_to_delete�k�vr r r � _rollback^ s � �zRenderer._rollbackc C s* | j |kr| j |krtjj�|| _ dS dS )a Set the renderer's current section. Sections must be rendered order: QUESTION, ANSWER, AUTHORITY, ADDITIONAL. Sections may be empty. Raises dns.exception.FormError if an attempt was made to set a section value less than the current section. N)r �dns� exception� FormError)r r r r r � _set_sectionm s �zRenderer._set_sectionc c s8 � | j �� }|V | j �� | jkr| �|� tjj�d S �N)r �tellr r# r$ r% �TooBig)r �startr r r � _track_size| s � �zRenderer._track_sizec C sr | � t� | �� � |�| j| j| j� | j�t� d||�� W d � n1 s)w Y | j t d7 < dS )z Add a question to the message.z!HHNr ) r' r r, �to_wirer r r r �struct�packr )r �qname�rdtype�rdclassr r r � add_question� s �zRenderer.add_questionc K sd | � |� | �� � |j| j| j| jfi |��}W d � n1 s"w Y | j| |7 < dS )z�Add the rrset to the specified section. Any keyword arguments are passed on to the rdataset's to_wire() routine. N�r' r, r- r r r r )r r �rrset�kw�nr r r � add_rrset� s �zRenderer.add_rrsetc K sf | � |� | �� � |j|| j| j| jfi |��}W d � n1 s#w Y | j| |7 < dS )z�Add the rdataset to the specified section, using the specified name as the owner name. Any keyword arguments are passed on to the rdataset's to_wire() routine. Nr4 )r r �name�rdatasetr6 r7 r r r � add_rdataset� s � �zRenderer.add_rdatasetc C s6 |dM }||d> O }t jj�|||�}| �t|� dS )z&Add an EDNS OPT record to the message.l �~ � N)r$ �message�Message� _make_optr8 � ADDITIONAL)r �edns� ednsflags�payload�options�optr r r �add_edns� s zRenderer.add_ednsc C s~ | j �� } t|tjj�r|} ntj�|||�} tjj�||d|d|||�} tj� | | | d t t � � �|�\} } | � | |� dS )z$Add a TSIG signature to the message.r � N� r �getvalue� isinstancer$ �tsig�Keyr= r> � _make_tsig�sign�int�time� _write_tsig) r �keyname�secret�fudger � tsig_error� other_data� request_mac� algorithm�s�keyrK �_r r r �add_tsig� s ��zRenderer.add_tsigc C s� | j �� } t|tjj�r|} ntj�||| �} tjj�|| d|d|||�} tj� | | | d t t � � �||d�\} }| � | |� |S )ay Add a TSIG signature to the message. Unlike add_tsig(), this can be used for a series of consecutive DNS envelopes, e.g. for a zone transfer over TCP [RFC2845, 4.4]. For the first message in the sequence, give ctx=None. For each subsequent message, give the ctx that was returned from the add_multi_tsig() call for the previous message.r rG TrH ) r �ctxrR rS rT r rU rV rW rX rY rZ rK r r r �add_multi_tsig� s �� zRenderer.add_multi_tsigc C s� | � t� | �� �. |�| j| j| j� | j�t� dt j j t j jdd�� | j�� }|�| j� W d � n1 s:w Y | j�� }| j�|d � | j�t� d|| �� | jt d7 < | j�d� | j�t� d| jt �� | j�dtj� d S )Nz!HHIHr r z!Hr � )r' r@ r, r- r r r r r. r/ r$ � rdatatype�TSIG� rdataclass�ANYr) r r r �SEEK_END)r rK rR � rdata_start�afterr r r rQ � s � � zRenderer._write_tsigc C sZ | j �d� | j �t�d| j| j| jd | jd | jd | jd �� | j �dtj � dS )z�Write the DNS message header. Writing the DNS message header is done after all sections have been rendered, but before the optional TSIG signature is added. r z!HHHHHHr r r N) r r r r. r/ r r r r rd �r r r r � write_header� s �zRenderer.write_headerc C s | j �� S )z Return the wire format message.)r rI rg r r r �get_wire� s zRenderer.get_wire)Nr r Nr( )�__name__� __module__� __qualname__�__doc__r r# r' � contextlib�contextmanagerr, r$ rb �INr3 r8 r; rF rK �default_algorithmr\ r^ rQ rh ri r r r r r $ s$ ( � � r )rm rn r r. r rP � dns.exceptionr$ �dns.tsigr �ANSWER� AUTHORITYr@ r r r r r �<module> s
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