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dnspython
Package dns :: Module query
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Module query

source code

Talk to a DNS server.

Classes [hide private]
  UnexpectedSource
A DNS query response came from an unexpected address or port.
  BadResponse
A DNS query response does not respond to the question asked.
Functions [hide private]
 
_compute_expiration(timeout) source code
 
_poll_for(fd, readable, writable, error, timeout)
Poll polling backend.		 source code
 
_select_for(fd, readable, writable, error, timeout)
Select polling backend.		 source code
 
_wait_for(fd, readable, writable, error, expiration) source code
 
_set_polling_backend(fn)
Internal API.		 source code
 
_polling_backend(fd, readable, writable, error, timeout)
Select polling backend.		 source code
 
_wait_for_readable(s, expiration) source code
 
_wait_for_writable(s, expiration) source code
 
_addresses_equal(af, a1, a2) source code
 
_destination_and_source(af, where, port, source, source_port) source code
dns.message.Message object
udp(q, where, timeout=None, port=53, af=None, source=None, source_port=0, ignore_unexpected=False, one_rr_per_rrset=False)
Return the response obtained after sending a query via UDP.		 source code
 
_net_read(sock, count, expiration)
Read the specified number of bytes from sock.		 source code
 
_net_write(sock, data, expiration)
Write the specified data to the socket.		 source code
 
_connect(s, address) source code
dns.message.Message object
tcp(q, where, timeout=None, port=53, af=None, source=None, source_port=0, one_rr_per_rrset=False)
Return the response obtained after sending a query via TCP.		 source code
generator of dns.message.Message objects.
xfr(where, zone, rdtype=252, rdclass=1, timeout=None, port=53, keyring=None, keyname=None, relativize=True, af=None, lifetime=None, source=None, source_port=0, serial=0, use_udp=False, keyalgorithm=<DNS name HMAC-MD5.SIG-ALG.REG.INT.>)
Return a generator for the responses to a zone transfer.		 source code
Variables [hide private]
  __package__ = 'dns'
Function Details [hide private]

_poll_for(fd, readable, writable, error, timeout)

source code 

Poll polling backend.

Parameters:
  • fd (int) - File descriptor
  • readable (bool) - Whether to wait for readability
  • writable (bool) - Whether to wait for writability
  • timeout (float @return True on success, False on timeout) - Deadline timeout (expiration time, in seconds)

_select_for(fd, readable, writable, error, timeout)

source code 

Select polling backend.

Parameters:
  • fd (int) - File descriptor
  • readable (bool) - Whether to wait for readability
  • writable (bool) - Whether to wait for writability
  • timeout (float @return True on success, False on timeout) - Deadline timeout (expiration time, in seconds)

_set_polling_backend(fn)

source code 

Internal API. Do not use.

_polling_backend(fd, readable, writable, error, timeout)

source code 

Select polling backend.

Parameters:
  • fd (int) - File descriptor
  • readable (bool) - Whether to wait for readability
  • writable (bool) - Whether to wait for writability
  • timeout (float @return True on success, False on timeout) - Deadline timeout (expiration time, in seconds)

udp(q, where, timeout=None, port=53, af=None, source=None, source_port=0, ignore_unexpected=False, one_rr_per_rrset=False)

source code 

Return the response obtained after sending a query via UDP.

Parameters:
  • q (dns.message.Message) - the query
  • where (string containing an IPv4 or IPv6 address) - where to send the message
  • timeout (float) - The number of seconds to wait before the query times out. If None, the default, wait forever.
  • port (int) - The port to which to send the message. The default is 53.
  • af (int) - the address family to use. The default is None, which causes the address family to use to be inferred from the form of where. If the inference attempt fails, AF_INET is used.
  • source (string) - source address. The default is the wildcard address.
  • source_port (int) - The port from which to send the message. The default is 0.
  • ignore_unexpected (bool) - If True, ignore responses from unexpected sources. The default is False.
  • one_rr_per_rrset (bool) - Put each RR into its own RRset
Returns: dns.message.Message object

_net_read(sock, count, expiration)

source code 

Read the specified number of bytes from sock. Keep trying until we either get the desired amount, or we hit EOF. A Timeout exception will be raised if the operation is not completed by the expiration time.

_net_write(sock, data, expiration)

source code 

Write the specified data to the socket. A Timeout exception will be raised if the operation is not completed by the expiration time.

tcp(q, where, timeout=None, port=53, af=None, source=None, source_port=0, one_rr_per_rrset=False)

source code 

Return the response obtained after sending a query via TCP.

Parameters:
  • q (dns.message.Message object) - the query
  • where (string containing an IPv4 or IPv6 address) - where to send the message
  • timeout (float) - The number of seconds to wait before the query times out. If None, the default, wait forever.
  • port (int) - The port to which to send the message. The default is 53.
  • af (int) - the address family to use. The default is None, which causes the address family to use to be inferred from the form of where. If the inference attempt fails, AF_INET is used.
  • source (string) - source address. The default is the wildcard address.
  • source_port (int) - The port from which to send the message. The default is 0.
  • one_rr_per_rrset (bool) - Put each RR into its own RRset
Returns: dns.message.Message object

xfr(where, zone, rdtype=252, rdclass=1, timeout=None, port=53, keyring=None, keyname=None, relativize=True, af=None, lifetime=None, source=None, source_port=0, serial=0, use_udp=False, keyalgorithm=<DNS name HMAC-MD5.SIG-ALG.REG.INT.>)

source code 

Return a generator for the responses to a zone transfer.

Parameters:
  • where (string containing an IPv4 or IPv6 address) - where to send the message
  • zone (dns.name.Name object or string) - The name of the zone to transfer
  • rdtype (int or string) - The type of zone transfer. The default is dns.rdatatype.AXFR.
  • rdclass (int or string) - The class of the zone transfer. The default is dns.rdataclass.IN.
  • timeout (float) - The number of seconds to wait for each response message. If None, the default, wait forever.
  • port (int) - The port to which to send the message. The default is 53.
  • keyring (dict) - The TSIG keyring to use
  • keyname (dns.name.Name object or string) - The name of the TSIG key to use
  • relativize (bool) - If True, all names in the zone will be relativized to the zone origin. It is essential that the relativize setting matches the one specified to dns.zone.from_xfr().
  • af (int) - the address family to use. The default is None, which causes the address family to use to be inferred from the form of where. If the inference attempt fails, AF_INET is used.
  • lifetime (float) - The total number of seconds to spend doing the transfer. If None, the default, then there is no limit on the time the transfer may take.
  • source (string) - source address. The default is the wildcard address.
  • source_port (int) - The port from which to send the message. The default is 0.
  • serial (int) - The SOA serial number to use as the base for an IXFR diff sequence (only meaningful if rdtype == dns.rdatatype.IXFR).
  • use_udp (bool) - Use UDP (only meaningful for IXFR)
  • keyalgorithm (string) - The TSIG algorithm to use; defaults to dns.tsig.default_algorithm
Returns: generator of dns.message.Message objects.

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