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eM ddb�dcdd�Zwdd2�dedf�ZxdS )k�DNS stub resolver.� N)�Any�Dict�Iterator�List�Optional�Sequence�Tuple�Union)�urlparse�win32c st e Zd ZdZddhZdZ� fdd�Zddd�Zed �� fd
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dd� Zdd� Z� ZS )�NXDOMAINz"The DNS query name does not exist.�qnames� responsesNc s t � j|i |�� d S �N��super�__init__��self�args�kwargs�� __class__� �0/usr/lib/python3.9/site-packages/dns/resolver.pyr > s zNXDOMAIN.__init__c C s\ t |tttf�std��t|�dkr,td��|d u r:i }nt |t�sLtd��t||d�}|S )Nz#qnames must be a list, tuple or setr z(qnames must contain at least one elementz(responses must be a dict(qname=response)�r r )�
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zNXDOMAIN._check_kwargs��returnc sP d| j vrt� �� S | j d }t|�dkr0d}nd}d�tt|��}d�||�S )Nr � z None of DNS query names existz!The DNS query name does not existz, z{}: {})r r �__str__r" �join�map�str�format)r r �msgr r r r( M s
zNXDOMAIN.__str__c C sp d| j vrtd��| j d D ]D}| j d | }z |�� }||krJ|W S W q ty^ Y q 0 q | j d d S )z%Return the unresolved canonical name.r z parametrized exception requiredr r )r � TypeError�canonical_name� Exception)r �qname�response�cnamer r r r/ X s
zNXDOMAIN.canonical_namec C sx t | j�dg ��}t| j�di ��}|j�di �}|j�dg �D ]*}||vrV|�|� ||v r@|| ||< q@t||d�S )z3Augment by results from another NXDOMAIN exception.r r r )r r �getr# �appendr
)r Ze_nxZqnames0Z
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zNXDOMAIN.__add__c C s
| j d S )zXAll of the names that were tried.
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r �r �r r r r r u s zNXDOMAIN.qnamesc C s
| j d S )z�A map from queried names to their NXDOMAIN responses.
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r r7 r8 r r r r | s zNXDOMAIN.responsesc C s | j d | S )zTThe response for query *qname*.
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r r7 )r r1 r r r r2 � s zNXDOMAIN.response)N)�__name__�
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c @ s e Zd ZdZdS )�YXDOMAINz8The DNS query name is too long after DNAME substitution.N�r9 r: r; r< r r r r rA � s rA )�errorsr& c C s, g }| D ] }|� d�|d |d �� q|S )z3Turn a resolution errors trace into a list of text.zServer {} answered {}r � )r5 r, )rC Ztexts�errr r r �_errors_to_text� s rF c sH e Zd ZdZdZdedd� ZddhZ� fdd�Z� fd d
�Z� Z S ) �LifetimeTimeoutz The resolution lifetime expired.z(%s after {timeout:.3f} seconds: {errors}N����timeoutrC c s t � j|i |�� d S r r r r r r r � s zLifetimeTimeout.__init__c s& t |d �}t� j|d d�|�d�S )NrC rI �; �rI rC )rF r � _fmt_kwargsr) �r r Zsrv_msgsr r r rL � s �zLifetimeTimeout._fmt_kwargs�
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�NoAnswerz<The DNS response does not contain an answer to the question.zDThe DNS response does not contain an answer to the question: {query}r2 c s t � j|i |�� d S r r r r r r r � s zNoAnswer.__init__c s t � j|d jd�S )Nr2 )�query)r rL �question)r r r r r rL � s zNoAnswer._fmt_kwargsc C s
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r9 r: r; r< r> r= r rL r2 r@ r r r r rO � s rO c sH e Zd ZdZdZdedd� ZddhZ� fdd �Z� fd
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NoNameserversz�All nameservers failed to answer the query.
errors: list of servers and respective errors
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z+All nameservers failed to answer the query.z%s {query}: {errors}NrH �requestrC c s t � j|i |�� d S r r r r r r r � s zNoNameservers.__init__c s( t |d �}t� j|d jd�|�d�S )NrC rS rJ )rP rC )rF r rL rQ r) rM r r r rL � s �zNoNameservers._fmt_kwargsrN r r r r rR � s rR c @ s e Zd ZdZdS )� NotAbsolutezEAn absolute domain name is required but a relative name was provided.NrB r r r r rT � s rT c @ s e Zd ZdZdS )� NoRootSOAzBThere is no SOA RR at the DNS root name. This should never happen!NrB r r r r rU � s rU c @ s e Zd ZdZdS )�
NoMetaqueriesz DNS metaqueries are not allowed.NrB r r r r rV � s rV c @ s e Zd ZdZdS )�NoResolverConfigurationzEResolver configuration could not be read or specified no nameservers.NrB r r r r rW � s rW c @ sr e Zd ZdZdejjejjej j
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d� Zdd� ZdS )�Answera& DNS stub resolver answer.
Instances of this class bundle up the result of a successful DNS
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protocol, forwarding to its ``rrset`` attribute. E.g.
``for a in answer`` is equivalent to ``for a in answer.rrset``.
``answer[i]`` is equivalent to ``answer.rrset[i]``, and
``answer[i:j]`` is equivalent to ``answer.rrset[i:j]``.
Note that CNAMEs or DNAMEs in the response may mean that answer
RRset's name might not be the query name.
N)r1 �rdtype�rdclassr2 �
nameserver�portr& c C sX || _ || _|| _|| _|| _|| _|�� | _| jj| _| jj | _
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zAnswer.__init__c C s\ |dkr| j jS |dkr | j jS |dkr0| j jS |dkr@| j jS |dkrP| j jS t|��d S )N�name�ttl�coversrZ rY )r^ ra rb rc rZ rY r! )r �attrr r r � __getattr__ s zAnswer.__getattr__r% c C s | j rt| j �pdS �Nr )r^ r" r8 r r r �__len__) s zAnswer.__len__c C s | j rt| j �ptt� �S r )r^ �iterr r8 r r r �__iter__, s zAnswer.__iter__c C s | j d u rt�| j | S r �r^ �
IndexError�r �ir r r � __getitem__/ s
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zAnswer.__delitem__)NN)r9 r: r; r< �dnsra �Name� rdatatype� RdataType�
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RdataClass�message� QueryMessager r+ �intr re rg ri rn ro r r r r rX � s" �� rX c @ s e Zd ZdZdS )�Answersz5A dict of DNS stub resolver answers, indexed by type.NrB r r r r ry : s ry c @ s� e Zd ZdZedee ee ed d�dd��Ze j
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d�ZdS )� HostAnswerszTA dict of DNS stub resolver answers to a host name lookup, indexed by
type.
NT)�v6�v4� add_emptyr& c C sF t � }|d ur$|s|jr$||tjj< |d urB|s6|jrB||tjj< |S r )rz r^ rp rr �AAAA�A)�clsr{ r| r} �answersr r r �makeC s zHostAnswers.make)�familyr& c c s� |t jkr2| �t j�E d H | �t j�E d H d S |t jkrL| �tjj�}n(|t jkrf| �tjj �}nt
d|� ���|r�|D ]}|j |fV q|d S )N�unknown address family ) �socket� AF_UNSPEC�addresses_and_families�AF_INET6�AF_INETr4 rp rr r~ r �NotImplementedError�address)r r� r] Zrdatar r r r� S s
z"HostAnswers.addresses_and_familiesc C s dd� | � |�D �S )Nc s s | ]}|d V qdS )r Nr )�.0Zpairr r r � <genexpr>g � z(HostAnswers.addresses.<locals>.<genexpr>)r� )r r� r r r � addressesf s zHostAnswers.addressesr% c C s | � tjj| � tjj��}|jS r )r4 rp rr r~ r r/ )r r] r r r r/ j s zHostAnswers.canonical_name)NNT)r9 r: r; r< � classmethodr rX �boolr� r� r� rx r r r+ r� r� rp ra rq r/ r r r r rz > s$ ���� rz c @ s@ e Zd ZdZd eedd�dd�Zdd�dd �Zd d�d
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�CacheStatisticszCache Statisticsr N)�hits�missesr& c C s || _ || _d S r �r� r� )r r� r� r r r r r s zCacheStatistics.__init__r% c C s d| _ d| _d S rf r� r8 r r r �resetv s zCacheStatistics.resetc C s t | j| j�S r )r� r� r� r8 r r r �clonez s zCacheStatistics.clone)r r )r9 r: r; r< rx r r� r� r r r r r� o s r� c @ sR e Zd Zdd�dd�Zdd�dd�Zed�dd�Zed�d d
�Zed�d d �Z dS )
� CacheBaseNr% c C s t �� | _t� | _d S r )� threading�Lock�lockr� �
statisticsr8 r r r r s
zCacheBase.__init__c C s4 | j � | j�� W d � n1 s&0 Y dS )z Reset all statistics to zero.N)r� r� r� r8 r r r �reset_statistics� s zCacheBase.reset_statisticsc C s2 | j � | jjW d � S 1 s$0 Y dS )z How many hits has the cache had?N)r� r� r� r8 r r r r� � s zCacheBase.hitsc C s2 | j � | jjW d � S 1 s$0 Y dS )z"How many misses has the cache had?N)r� r� r� r8 r r r r� � s zCacheBase.missesc C s4 | j � | j�� W d � S 1 s&0 Y dS )z�Return a consistent snapshot of all the statistics.
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misses() individually.
N)r� r� r� r8 r r r �get_statistics_snapshot� s z!CacheBase.get_statistics_snapshot)
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S )�Cachez$Simple thread-safe DNS answer cache.� �r@N)�cleaning_intervalr& c s* t � �� i | _|| _t�� | j | _dS )zf*cleaning_interval*, a ``float`` is the number of seconds between
periodic cleanings.
N)r r �datar� r_ �
next_cleaning)r r� r r r r � s
zCache.__init__r% c C sh t � � }| j|krdg }| j�� D ] \}}|j|kr |�|� q |D ] }| j|= qBt � � }|| j | _dS )z&Clean the cache if it's time to do so.N)r_ r� r� �itemsr` r5 r� )r �nowZkeys_to_delete�k�vr r r � _maybe_clean� s
zCache._maybe_clean��keyr& c C s� | j �n | �� | j�|�}|du s2|jt�� krR| j jd7 _W d � dS | j jd7 _|W d � S 1 sz0 Y dS �aK Get the answer associated with *key*.
Returns None if no answer is cached for the key.
*key*, a ``(dns.name.Name, dns.rdatatype.RdataType, dns.rdataclass.RdataClass)``
tuple whose values are the query name, rdtype, and rdclass respectively.
Returns a ``dns.resolver.Answer`` or ``None``.
Nr' ) r� r� r� r4 r` r_ r� r� r� )r r� r� r r r r4 � s z Cache.get�r� �valuer& c C s< | j �" | �� || j|< W d � n1 s.0 Y dS �a Associate key and value in the cache.
*key*, a ``(dns.name.Name, dns.rdatatype.RdataType, dns.rdataclass.RdataClass)``
tuple whose values are the query name, rdtype, and rdclass respectively.
*value*, a ``dns.resolver.Answer``, the answer.
N)r� r� r� �r r� r� r r r �put� s z Cache.putc C s\ | j �B |dur$|| jv r:| j|= ni | _t�� | j | _W d � n1 sN0 Y dS �a2 Flush the cache.
If *key* is not ``None``, only that item is flushed. Otherwise the entire cache
is flushed.
*key*, a ``(dns.name.Name, dns.rdatatype.RdataType, dns.rdataclass.RdataClass)``
tuple whose values are the query name, rdtype, and rdclass respectively.
N)r� r� r_ r� r� )r r� r r r �flush� s
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r� c @ s6 e Zd ZdZdd� Zd dd�dd�Zdd�d d
�ZdS ) � LRUCacheNodezLRUCache node.c C s" || _ || _d| _| | _| | _d S rf )r� r� r� �prev�nextr� r r r r � s
zLRUCacheNode.__init__N)�noder& c C s || _ |j| _| |j_ | |_d S r �r� r� )r r� r r r �
link_after� s zLRUCacheNode.link_afterr% c C s | j | j_ | j| j _d S r r� r8 r r r �unlink� s
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� ZS )�LRUCachea` Thread-safe, bounded, least-recently-used DNS answer cache.
This cache is better than the simple cache (above) if you're
running a web crawler or other process that does a lot of
resolutions. The LRUCache has a maximum number of nodes, and when
it is full, the least-recently used node is removed to make space
for a new one.
順 N)�max_sizer& c s> t � �� i | _| �|� tdd�| _| j| j_| j| j_dS )zl*max_size*, an ``int``, is the maximum number of nodes to cache;
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zLRUCache.__init__c C s |dk r d}|| _ d S )Nr' )r� r� r r r r� s zLRUCache.set_max_sizer� c C s� | j �� | j�|�}|du r<| j jd7 _W d � dS |�� |jjt�� kr~| j|j = | j jd7 _W d � dS |�
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z LRUCache.getc C sr | j �X | j�|�}|du s,|jjt�� kr<W d � dS |jW d � S W d � n1 sd0 Y dS )zBReturn the number of cache hits associated with the specified key.Nr )r� r� r4 r� r` r_ r� r� r r r �get_hits_for_key; s
zLRUCache.get_hits_for_keyr� c C s� | j �� | j�|�}|dur.|�� | j|j= t| j�| jkrZ| jj}|�� | j|j= q.t ||�}|�
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z LRUCache.putc C s� | j �l |dur8| j�|�}|durd|�� | j|j= n,| jj}|| jkr^|j}|�� |}q@i | _W d � n1 sx0 Y dS r� )r� r� r4 r� r� r� r� )r r� r� r� r� r r r r� Z s
zLRUCache.flush)r� )N)r9 r: r; r< rx r r� r� r rX r4 r� r� r� r@ r r r r r� s r� c @ s� e Zd ZdZdeejjef eej j
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d�ZdS )� _Resolutiona Helper class for dns.resolver.Resolver.resolve().
All of the "business logic" of resolution is encapsulated in this
class, allowing us to have multiple resolve() implementations
using different I/O schemes without copying all of the
complicated logic.
This class is a "friend" to dns.resolver.Resolver and manipulates
resolver data structures directly.
� BaseResolverN)�resolverr1 rY rZ �tcp�raise_on_no_answer�searchr& c C s� t |t�rtj�|d �}tjj�|�}tj�|�r6t �tj
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z_Resolution.__init__r% c C s� t | j�dk�r�| j�d�| _| jjr�| jj�| j| j| jf�}|durn|j du rf| j
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jjkr�|j | j| j< q t
j�| j| j| j�}| jjdur�|j| jj| jj| jjd� |j| jj| jj| jj | jj d� | jj du�r,| jj |_ | j� | jj | jj!| jj"�| _#| jj$�r`t%�&| j#� | j#dd� | _'g | _(d| _)d| _*d| _+|| _,d| _-|dfS t| j.| jd��dS ) z�Get the next request to send, and check the cache.
Returns a (request, answer) tuple. At most one of request or
answer will not be None.
r N�r2 )� algorithm)�optionsFg�������?r )/r" r �popr1 r� �cacher4 rY rZ r^ r� rO r2 rp rr �ANY�rcoder
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make_query�keyname�use_tsig�keyring� keyalgorithm�use_edns�edns� ednsflags�payload� ednsoptions�flags�_enrich_nameservers� _nameservers�nameserver_portsr\ r� �rotate�randomZshuffler� rC r[ r� r� rS r� r� )r r] rS r r r � next_request� s^ �� ��
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z_Resolution.next_requestc C s� | j r:| jd usJ �| j�� r"J �d| _d| _ | jddfS d}| js�t| j�dkrbt| j| j d��| jd d � | _| j
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p�| j�� | _| j| j|fS )NTFr r� )rS rC � )r� r[ Zis_always_max_sizer� r� r" r� rR rS rC r� �minr� r� )r r� r r r �next_nameserver� s z_Resolution.next_nameserver)r2 �exr& c
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*rdtype*, an ``int`` or ``str``, the query type.
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*tcp*, a ``bool``. If ``True``, use TCP to make the query.
*source*, a ``str`` or ``None``. If not ``None``, bind to this IP
address when making queries.
*raise_on_no_answer*, a ``bool``. If ``True``, raise
``dns.resolver.NoAnswer`` if there's no answer to the question.
*source_port*, an ``int``, the port from which to send the message.
*lifetime*, a ``float``, how many seconds a query should run
before timing out.
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may be added to relative names. The default is ``None``,
which causes the value of the resolver's
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in the specified lifetime.
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DNAME substitution.
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``True`` and the query name exists but has no RRset of the
desired type and class.
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function.
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is 5 seconds.
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then the resolver's nameservers are set to the returned servers in priority
order.
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nor does it resolve addresses for the SCVB target name, rather it assumes that
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*resolver*, a ``dns.resolver.Resolver`` or ``None``, the resolver to use.
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*lifetime*, a ``float``, the total time to allow for the queries needed
to determine the zone. If ``None``, the default, then only the individual
query limits of the resolver apply.
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root. (This is only likely to happen if you're using non-default
root servers in your network and they are misconfigured.)
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*family*, an ``int``, the address family to use. This parameter is used if
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the first address returned by ``resolve_name()`` will be used, otherwise the
first address of the specified family will be used.
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parameters *where*, *port*, *family*, and *resolver*.
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