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@var default_resolver: The default resolver object
@type default_resolver: dns.resolver.Resolver objecti����Nt win32t NXDOMAINc B s e Z d Z RS( s The query name does not exist.( t __name__t
__module__t __doc__( ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyR . s t YXDOMAINc B s e Z d Z RS( s4 The query name is too long after DNAME substitution.( R R R ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyR 2 s t NoAnswerc B s e Z d Z RS( s7 The response did not contain an answer to the question.( R R R ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyR < s t
NoNameserversc B s e Z d Z RS( s< No non-broken nameservers are available to answer the query.( R R R ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyR @ s t NotAbsolutec B s e Z d Z RS( sS Raised if an absolute domain name is required but a relative name
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This should never happen!( R R R ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyR I s t
NoMetaqueriesc B s e Z d Z RS( s Metaqueries are not allowed.( R R R ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyR
N s t Answerc B sY e Z d Z e d � Z d � Z d � Z d � Z d � Z d � Z d � Z
d � Z RS( s9 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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@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
g �r@c C s; i | _ | | _ t j � | j | _ t j � | _ d S( s� Initialize a DNS cache.
@param cleaning_interval: the number of seconds between periodic
cleanings. The default is 300.0
@type cleaning_interval: float.
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_threadingt Lockt lock( R$ R= ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyR+ � s c C s� t j � } | j | k r� g } x< | j j � D]+ \ } } | j | k r1 | j | � q1 q1 Wx | D] } | j | =qg Wt j � } | | j | _ n d S( s& Clean the cache if it's time to do so.N( R" R> R< t iteritemsR# t appendR= ( R$ t nowt keys_to_deletet kt v( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyt _maybe_clean� s
c C sk zV | j j � | j � | j j | � } | d k sM | j t j � k rQ d S| SWd | j j � Xd S( s) 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
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!c C s= z( | j j � | j � | | j | <Wd | j j � Xd S( s Associate key and value in the cache.
@param key: the key
@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 C ss z^ | j j � | d k r> | j j | � r] | j | =q] n i | _ t j � | j | _ Wd | j j � Xd S( s� Flush the cache.
If I{key} is specified, only that item is flushed. Otherwise
the entire cache is flushed.
@param key: the key to flush
@type key: (dns.name.Name, int, int) tuple or None
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t LRUCacheNodec B s2 e Z d Z d � Z d � Z d � Z d � Z RS( s LRUCache node.
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t LRUCachec B sA e Z d Z d d � Z d � Z d � Z d � Z d d � Z RS( sO 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
i�� c C s; i | _ | j | � t d d � | _ t j � | _ d S( s� Initialize a DNS cache.
@param max_size: The maximum number of nodes to cache; the default is 100000. Must be > 1.
@type max_size: int
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| j � | j SWd | j j � Xd S( s) 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
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@param key: the key
@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
N( RA RI R< RJ R RW RL R0 R[ RZ RR RQ RV RK ( R$ RL RM RT ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyRN { s
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� Xd S( s� Flush the cache.
If I{key} is specified, only that item is flushed. Otherwise
the entire cache is flushed.
@param key: the key to flush
@type key: (dns.name.Name, int, int) tuple or None
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N( R R R R+ RY RJ RN R RP ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/resolver.pyRX B s t Resolverc B s� e Z d Z d e d � Z d � Z d � Z d � Z d � Z d � Z d � Z
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d � Z d e j j d � Z d � Z d � Z RS( s) 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
s /etc/resolv.confc C sI | j � | rE t j d k r, | j � qE | rE | j | � qE n d S( sJ Initialize a resolver instance.
@param filename: The filename of a configuration file in
standard /etc/resolv.conf format. This parameter is meaningful
only when I{configure} is true and the platform is POSIX.
@type filename: string or file object
@param configure: If True (the default), the resolver instance
is configured in the normal fashion for the operating system
the resolver is running on. (I.e. a /etc/resolv.conf file on
POSIX systems and from the registry on Windows systems.)
@type configure: boolR N( t resett syst platformt
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rYd } n X| rp| j | � n d S( s% Extract DNS info from a registry key.t
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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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c C sD | | _ | d k r. | j j � d | _ n | | _ | | _ d S( s� Add a TSIG signature to the query.
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@type keyring: dict
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c C s4 | d k r d } n | | _ | | _ | | _ d S( s Configure Edns.
@param edns: The EDNS level to use. The default is -1, no Edns.
@type edns: int
@param ednsflags: The EDNS flags
@type ednsflags: int
@param payload: The EDNS payload size. The default is 0.
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