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dns :: resolver :: Resolver :: Class Resolver
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Class Resolver

source code

object --+
         |
        Resolver

DNS stub resolver

Instance Methods [hide private]
 
__init__(self, filename='/etc/resolv.conf', configure=True)
Initialize a resolver instance.		 source code
 
reset(self)
Reset all resolver configuration to the defaults.		 source code
 
read_resolv_conf(self, f)
Process f as a file in the /etc/resolv.conf format.		 source code
 
_determine_split_char(self, entry) source code
 
_config_win32_nameservers(self, nameservers)
Configure a NameServer registry entry.		 source code
 
_config_win32_domain(self, domain)
Configure a Domain registry entry.		 source code
 
_config_win32_search(self, search)
Configure a Search registry entry.		 source code
 
_config_win32_fromkey(self, key)
Extract DNS info from a registry key.		 source code
 
read_registry(self)
Extract resolver configuration from the Windows registry.		 source code
 
_win32_is_nic_enabled(self, lm, guid, interface_key) source code
 
_compute_timeout(self, start) source code
dns.resolver.Answer instance
query(self, qname, rdtype=1, rdclass=1, tcp=False, source=None, raise_on_no_answer=True, source_port=0)
Query nameservers to find the answer to the question.		 source code
 
use_tsig(self, keyring, keyname=None, algorithm=<DNS name HMAC-MD5.SIG-ALG.REG.INT.>)
Add a TSIG signature to the query.		 source code
 
use_edns(self, edns, ednsflags, payload)
Configure Edns.		 source code
 
set_flags(self, flags)
Overrides the default flags with your own		 source code

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Instance Variables [hide private]
dns.resolver.Cache object cache
The cache to use.
dns.name.Name object domain
The domain of this host
int edns
The EDNS level to use.
int ednsflags
The EDNS flags
int flags
The message flags to use.
string keyalgorithm
The TSIG key algorithm to use.
dns.name.Name object keyname
The TSIG keyname to use.
dict keyring
The TSIG keyring to use.
float lifetime
The total number of seconds to spend trying to get an answer to the question.
list of strings nameservers
A list of nameservers to query.
int payload
The EDNS payload size.
int port
The port to which to send queries.
bool retry_servfail
should we retry a nameserver if it says SERVFAIL? The default is 'false'.
list of dns.name.Name objects search
The search list.
float timeout
The number of seconds to wait for a response from a server, before timing out.
Properties [hide private]

Inherited from object: __class__

Method Details [hide private]

__init__(self, filename='/etc/resolv.conf', configure=True)
(Constructor)

source code 

Initialize a resolver instance.

Parameters:
  • filename (string or file object) - The filename of a configuration file in standard /etc/resolv.conf format. This parameter is meaningful only when configure is true and the platform is POSIX.
  • configure (bool) - 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.)
Overrides: object.__init__

read_resolv_conf(self, f)

source code 

Process f as a file in the /etc/resolv.conf format. If f is a string, it is used as the name of the file to open; otherwise it is treated as the file itself.

query(self, qname, rdtype=1, rdclass=1, tcp=False, source=None, raise_on_no_answer=True, source_port=0)

source code 

Query nameservers to find the answer to the question.

The qname, rdtype, and rdclass parameters may be objects of the appropriate type, or strings that can be converted into objects of the appropriate type. E.g. For rdtype the integer 2 and the the string 'NS' both mean to query for records with DNS rdata type NS.

Parameters:
  • qname (dns.name.Name object or string) - the query name
  • rdtype (int or string) - the query type
  • rdclass (int or string) - the query class
  • tcp (bool) - use TCP to make the query (default is False).
  • source (IP address in dotted quad notation) - bind to this IP address (defaults to machine default IP).
  • raise_on_no_answer (bool) - raise NoAnswer if there's no answer (defaults is True).
  • source_port (int) - The port from which to send the message. The default is 0.
Returns: dns.resolver.Answer instance
Raises:
  • Timeout - no answers could be found in the specified lifetime
  • NXDOMAIN - the query name does not exist
  • YXDOMAIN - the query name is too long after DNAME substitution
  • NoAnswer - the response did not contain an answer and raise_on_no_answer is True.
  • NoNameservers - no non-broken nameservers are available to answer the question.

use_tsig(self, keyring, keyname=None, algorithm=<DNS name HMAC-MD5.SIG-ALG.REG.INT.>)

source code 

Add a TSIG signature to the query.

Parameters:
  • keyring (dict) - The TSIG keyring to use; defaults to None.
  • 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.
  • algorithm (string) - The TSIG key algorithm to use. The default is dns.tsig.default_algorithm.

use_edns(self, edns, ednsflags, payload)

source code 

Configure Edns.

Parameters:
  • edns (int) - The EDNS level to use. The default is -1, no Edns.
  • ednsflags (int) - The EDNS flags
  • payload (int) - The EDNS payload size. The default is 0.

set_flags(self, flags)

source code 

Overrides the default flags with your own

Parameters:
  • flags (int) - The flags to overwrite the default with

Instance Variable Details [hide private]

cache

The cache to use. The default is None.
Type:
dns.resolver.Cache object

edns

The EDNS level to use. The default is -1, no Edns.
Type:
int

flags

The message flags to use. The default is None (i.e. not overwritten)
Type:
int

keyalgorithm

The TSIG key algorithm to use. The default is dns.tsig.default_algorithm.
Type:
string

keyname

The TSIG keyname to use. The default is None.
Type:
dns.name.Name object

keyring

The TSIG keyring to use. The default is None.
Type:
dict

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:
float

nameservers

A list of nameservers to query. Each nameserver is a string which contains the IP address of a nameserver.
Type:
list of strings

payload

The EDNS payload size. The default is 0.
Type:
int

port

The port to which to send queries. The default is 53.
Type:
int

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:
list of dns.name.Name objects

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