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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.
Returns a list of ``dns.name.Name``.
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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``dns.message.Message``.
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$0 Y dS )z"How many misses has the cache had?N)r� r� r� r8 r r r r� � s zCacheBase.missesc C s4 | j � | j�� W d � S 1 s&0 Y dS )z�Return a consistent snapshot of all the statistics.
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misses() individually.
N)r� r� r� r8 r r r �get_statistics_snapshot� s z!CacheBase.get_statistics_snapshot)
r9 r: r; r r� rx r� r� r� r� r r r r r� ~ s
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S )�Cachez$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
zLRUCacheNode.unlink)r9 r: r; r< r r� r� r r r r r� � s r� c s� e Zd ZdZdedd�� fdd�
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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
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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 d| _d| _ | jddfS d}| jsnt| j�dkrFt| j| jd��| jd d � | _| j }t
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� | _| j| j|fS )NTFr r� )rS rC � )r� r� r[ r� r" r� rR rS rC r� �minr� r� Zis_always_max_size)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.
*rdclass*, an ``int`` or ``str``, the query class.
*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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are used for relative names, and whether the resolver's domain
may be added to relative names. The default is ``None``,
which causes the value of the resolver's
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Raises ``dns.resolver.LifetimeTimeout`` if no answers could be found
in the specified lifetime.
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Raises ``dns.resolver.YXDOMAIN`` if the query name is too long after
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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except for rdtype and rdclass are also supported by this
function.
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``dns.resolver.NXDOMAIN``.
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is 5 seconds.
If the SVCB query is successful and results in a non-empty list of nameservers,
then the resolver's nameservers are set to the returned servers in priority
order.
The current implementation does not use any address hints from the SVCB record,
nor does it resolve addresses for the SCVB target name, rather it assumes that
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C s( t jdtdd� t| |||||||d� S )a Query nameservers to find the answer to the question.
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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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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, and ``dns.resolver.make_resolver_at`` for information about the resolver
parameters *where*, *port*, *family*, and *resolver*.
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