/usr/lib/python3.6/site-packages/dns/__pycache__
Edit: /usr/lib/python3.6/site-packages/dns/__pycache__/resolver.cpython-36.pyc (35776B)
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@var default_resolver: The default resolver object
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Zd d Zd
d Z dS )Answera9 DNS stub resolver answer
Instances of this class bundle up the result of a successful DNS
resolution.
For convenience, the answer object implements much of the sequence
protocol, forwarding to its rrset. 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
node's name might not be the query name.
@ivar qname: The query name
@type qname: dns.name.Name object
@ivar rdtype: The query type
@type rdtype: int
@ivar rdclass: The query class
@type rdclass: int
@ivar response: The response message
@type response: dns.message.Message object
@ivar rrset: The answer
@type rrset: dns.rrset.RRset object
@ivar expiration: The time when the answer expires
@type expiration: float (seconds since the epoch)
@ivar canonical_name: The canonical name of the query name
@type canonical_name: dns.name.Name object
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Zd S )Cacheaq Simple DNS answer cache.
@ivar data: A dictionary of cached data
@type data: dict
@ivar cleaning_interval: The number of seconds between cleanings. The
default is 300 (5 minutes).
@type cleaning_interval: float
@ivar next_cleaning: The time the cache should next be cleaned (in seconds
since the epoch.)
@type next_cleaning: float
r@c C s* i | _ || _tj | j | _tj | _dS )zInitialize a DNS cache.
@param cleaning_interval: the number of seconds between periodic
cleanings. The default is 300.0
@type cleaning_interval: float.
N)datacleaning_intervalrQ
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_threadingLocklock)r rb r r r rU - s zCache.__init__c C sp t j }| j|krlg }x*| jj D ] \}}|j|kr"|j| q"W x|D ] }| j|= qHW t j }|| j | _dS )z&Clean the cache if it's time to do so.N)rQ rc ra r' rR r2 rb )r nowZkeys_to_deletekvr r r _maybe_clean: s
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C sN z<| j j | j | jj|}|dks6|jtj kr:dS |S | j j X dS )a) Get the answer associated with I{key}. Returns None if
no answer is cached for the key.
@param key: the key
@type key: (dns.name.Name, int, int) tuple whose values are the
query name, rdtype, and rdclass.
@rtype: dns.resolver.Answer object or None
N)rf acquirerj ra r1 rR rQ release)r keyri r r r r1 H s
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C s2 z | j j | j || j|< W d| j j X dS )a Associate key and value in the cache.
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@type key: (dns.name.Name, int, int) tuple whose values are the
query name, rdtype, and rdclass.
@param value: The answer being cached
@type value: dns.resolver.Answer object
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C sR z@| j j |dk r(|| jkr>| j|= ni | _tj | j | _W d| j j X dS )zFlush the cache.
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@param key: the key to flush
@type key: (dns.name.Name, int, int) tuple or None
N)rf rk ra rQ rb rc rl )r rm r r r flushk s
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link_after s zLRUCacheNode.link_afterc C s | j | j_ | j| j _d S )N)rr rs )r r r r unlink s
zLRUCacheNode.unlinkN)r4 r5 r6 r rU ru rv rw r r r r rq s
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Zd S )LRUCacheaO 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.
@ivar data: A dictionary of cached data
@type data: dict
@ivar sentinel: sentinel node for circular doubly linked list of nodes
@type sentinel: LRUCacheNode object
@ivar max_size: The maximum number of nodes
@type max_size: int
順 c C s* i | _ | j| tdd| _tj | _dS )zInitialize a DNS cache.
@param max_size: The maximum number of nodes to cache; the default is
100,000. Must be greater than 1.
@type max_size: int
N)ra set_max_sizerq sentinelrd re rf )r max_sizer r r rU s
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C sl zZ| j j | jj|}|dkr$dS |j |jjtj krJ| j|j= dS |j | j
|jS | j j X dS )a) Get the answer associated with I{key}. Returns None if
no answer is cached for the key.
@param key: the key
@type key: (dns.name.Name, int, int) tuple whose values are the
query name, rdtype, and rdclass.
@rtype: dns.resolver.Answer object or None
N) rf rk ra r1 rw rn rR rQ rm rv r{ rl )r rm rt r r r r1 s
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@param key: the key
@type key: (dns.name.Name, int, int) tuple whose values are the
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@param value: The answer being cached
@type value: dns.resolver.Answer object
N)
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N)
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dd Zejjejjdddd fd d Zdejjfd d Zd!d" Zd#d$ ZdS )&Resolvera- DNS stub resolver
@ivar domain: The domain of this host
@type domain: dns.name.Name object
@ivar nameservers: A list of nameservers to query. Each nameserver is
a string which contains the IP address of a nameserver.
@type nameservers: list of strings
@ivar search: The search list. If the query name is a relative name,
the resolver will construct an absolute query name by appending the search
names one by one to the query name.
@type search: list of dns.name.Name objects
@ivar port: The port to which to send queries. The default is 53.
@type port: int
@ivar timeout: The number of seconds to wait for a response from a
server, before timing out.
@type timeout: float
@ivar lifetime: The total number of seconds to spend trying to get an
answer to the question. If the lifetime expires, a Timeout exception
will occur.
@type lifetime: float
@ivar keyring: The TSIG keyring to use. The default is None.
@type keyring: dict
@ivar keyname: The TSIG keyname to use. The default is None.
@type keyname: dns.name.Name object
@ivar keyalgorithm: The TSIG key algorithm to use. The default is
dns.tsig.default_algorithm.
@type keyalgorithm: string
@ivar edns: The EDNS level to use. The default is -1, no Edns.
@type edns: int
@ivar ednsflags: The EDNS flags
@type ednsflags: int
@ivar payload: The EDNS payload size. The default is 0.
@type payload: int
@ivar flags: The message flags to use. The default is None (i.e. not
overwritten)
@type flags: int
@ivar cache: The cache to use. The default is None.
@type cache: dns.resolver.Cache object
@ivar retry_servfail: should we retry a nameserver if it says SERVFAIL?
The default is 'false'.
@type retry_servfail: bool
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@param configure: If True (the default), the resolver instance
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a Query nameservers to find the answer to the question.
The I{qname}, I{rdtype}, and I{rdclass} parameters may be objects
of the appropriate type, or strings that can be converted into objects
of the appropriate type. E.g. For I{rdtype} the integer 2 and the
the string 'NS' both mean to query for records with DNS rdata type NS.
@param qname: the query name
@type qname: dns.name.Name object or string
@param rdtype: the query type
@type rdtype: int or string
@param rdclass: the query class
@type rdclass: int or string
@param tcp: use TCP to make the query (default is False).
@type tcp: bool
@param source: bind to this IP address (defaults to machine default
IP).
@type source: IP address in dotted quad notation
@param raise_on_no_answer: raise NoAnswer if there's no answer
(defaults is True).
@type raise_on_no_answer: bool
@param source_port: The port from which to send the message.
The default is 0.
@type source_port: int
@rtype: dns.resolver.Answer instance
@raises Timeout: no answers could be found in the specified lifetime
@raises NXDOMAIN: the query name does not exist
@raises YXDOMAIN: the query name is too long after DNAME substitution
@raises NoAnswer: the response did not contain an answer and
raise_on_no_answer is True.
@raises NoNameservers: no non-broken nameservers are available to
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zResolver.queryc C s4 || _ |dkr$t| j j d | _n|| _|| _dS )a Add a TSIG signature to the query.
@param keyring: The TSIG keyring to use; defaults to None.
@type keyring: dict
@param keyname: The name of the TSIG key to use; defaults to None.
The key must be defined in the keyring. If a keyring is specified
but a keyname is not, then the key used will be the first key in the
keyring. Note that the order of keys in a dictionary is not defined,
so applications should supply a keyname when a keyring is used, unless
they know the keyring contains only one key.
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@type edns: int
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