constants Module

The constants module defines the various DNS constants, and also provides some utility functions for dealing with these.

constants.QR_QUERY = 0

QR flag for queries

constants.QR_RESPONSE = 1

QR flag for responses

constants.OP_QUERY = 0

OpCode for queries

constants.OP_IQUERY = 1

OpCode for inverse queries

constants.OP_STATUS = 2

OpCode for status queries

constants.OP_NOTIFY = 4

OpCode for NOTIFY messages

constants.OP_UPDATE = 5

OpCode for UPDATE messages

constants.OP_DSO = 6

OpCode for DNS Stateful Operation (DSO) messages

constants.OPCODE_NAMES = {0: 'QUERY', 1: 'IQUERY', 2: 'STATUS', 4: 'NOTIFY', 5: 'UPDATE', 6: 'DSO'}

Handy dictionary for converting numeric OPCODE into a symbolic name.

constants.RCODE_NOERROR = 0

No Error RCODE

constants.RCODE_FORMERR = 1

Format Error RCODE

constants.RCODE_SERVFAIL = 2

Server Failure RCODE

constants.RCODE_NXDOMAIN = 3

Non-Existent Domain RCODE

constants.RCODE_NOTIMP = 4

Not Implemented RCODE

constants.RCODE_REFUSED = 5

Query Refused RCODE

constants.RCODE_YXDOMAIN = 6

Name Exists when it should not RCODE

constants.RCODE_YXRRSET = 7

RR Set Exists when it should not RCODE

constants.RCODE_NXRRSET = 8

RR Set that should exist does not RCODE

constants.RCODE_NOTAUTH = 9

Server Not Authoritative for zone / Not Authorized RCODE

constants.RCODE_NOTZONE = 10

Name not contained in zone RCODE

constants.RCODE_DSOTYPENI = 11

DSO-TYPE Not Implemented RCODE

constants.RCODE_NAMES = {0: 'NoError', 1: 'FormErr', 2: 'ServFail', 3: 'NXDomain', 4: 'NotImp', 5: 'Refused', 6: 'YXDomain', 7: 'YXRRSet', 8: 'NXRRSet', 9: 'NotAuth', 10: 'NotZone', 11: 'DSOTYPENI'}

Handy dictionary for converting numeric RCODE into a symbolic name.

constants.RTYPE_A = 1

a host address RTYPE

constants.RTYPE_NS = 2

an authoritative name server RTYPE

constants.RTYPE_MD = 3

a mail destination RTYPE

constants.RTYPE_MF = 4

a mail forwarder RTYPE

constants.RTYPE_CNAME = 5

the canonical name for an alias RTYPE

constants.RTYPE_SOA = 6

marks the start of a zone of authority RTYPE

constants.RTYPE_MB = 7

a mailbox domain name RTYPE

constants.RTYPE_MG = 8

a mail group member RTYPE

constants.RTYPE_MR = 9

a mail rename domain name RTYPE

constants.RTYPE_NULL = 10

a null RR RTYPE

constants.RTYPE_WKS = 11

a well known service description RTYPE

constants.RTYPE_PTR = 12

a domain name pointer RTYPE

constants.RTYPE_HINFO = 13

host information RTYPE

constants.RTYPE_MINFO = 14

mailbox or mail list information RTYPE

constants.RTYPE_MX = 15

mail exchange RTYPE

constants.RTYPE_TXT = 16

text strings RTYPE

constants.RTYPE_RP = 17

for Responsible Person RTYPE

constants.RTYPE_AFSDB = 18

for AFS Data Base location RTYPE

constants.RTYPE_X25 = 19

for X.25 PSDN address RTYPE

constants.RTYPE_ISDN = 20

for ISDN address RTYPE

constants.RTYPE_RT = 21

for Route Through RTYPE

constants.RTYPE_NSAP = 22

for NSAP address, NSAP style A record RTYPE

constants.RTYPE_NSAP_PTR = 23

for domain name pointer, NSAP style RTYPE

constants.RTYPE_SIG = 24

for security signature RTYPE

constants.RTYPE_KEY = 25

for security key RTYPE

constants.RTYPE_PX = 26

X.400 mail mapping information RTYPE

constants.RTYPE_GPOS = 27

Geographical Position RTYPE

constants.RTYPE_AAAA = 28

IP6 Address RTYPE

constants.RTYPE_OPT = 41

OPT RTYPE

constants.RTYPE_RRSIG = 46

RRSIG RTYPE

constants.RTYPE_TSIG = 250

Transaction Signature

constants.RTYPE_IXFR = 251

incremental transfer

constants.RTYPE_AXFR = 252

transfer of an entire zone

constants.rtype_name(rtype: int) → str

Converts a numeric type value to a name. This is the symbolic name if we know it (like NS or AAAA), otherwise the RFC 3597 version (TYPE####).

Parameters:rtype (str) – Numeric value of an RTYPE to convert to string. Returns:String version of the RTYPE identifier. Return type:str

constants.CLASS_IN = 1

Internet class

constants.CLASS_CH = 3

Chaos class

constants.CLASS_HS = 4

Hesiod class

constants.CLASS_NONE = 254

“NONE” class

constants.CLASS_ANY = 255

“ANY” class

constants.class_name(dns_class: int) → str

Converts a numeric class value to a name. This is the symbolic name if we know it (like IN or CH), otherwise the RFC 3597 version (CLASS####).

Parameters:dns_class (str) – Numeric value of a class to convert to string. Returns:String version of the class identifier. Return type:str