Constants

There are many constants in dnsdist.

OPCode

These constants represent the OpCode of a query.

  • DNSOpcode.Query
  • DNSOpcode.IQuery
  • DNSOpcode.Status
  • DNSOpcode.Notify
  • DNSOpcode.Update

Reference: https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-5

DNSClass

These constants represent the CLASS of a DNS record.

  • DNSClass.IN
  • DNSClass.CHAOS
  • DNSClass.NONE
  • DNSClass.ANY

Reference: https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-2

RCode

These constants represent the different RCODEs for DNS messages.

Changed in version 1.4.0: The prefix is changed from dnsdist to DNSRCode.

  • DNSRCode.NOERROR
  • DNSRCode.FORMERR
  • DNSRCode.SERVFAIL
  • DNSRCode.NXDOMAIN
  • DNSRCode.NOTIMP
  • DNSRCode.REFUSED
  • DNSRCode.YXDOMAIN
  • DNSRCode.YXRRSET
  • DNSRCode.NXRRSET
  • DNSRCode.NOTAUTH
  • DNSRCode.NOTZONE

RCodes below are extended RCodes that can only be matched using ERCodeRule().

  • DNSRCode.BADVERS
  • DNSRCode.BADSIG
  • DNSRCode.BADKEY
  • DNSRCode.BADTIME
  • DNSRCode.BADMODE
  • DNSRCode.BADNAME
  • DNSRCode.BADALG
  • DNSRCode.BADTRUNC
  • DNSRCode.BADCOOKIE

EDNSOptionCode

  • EDNSOptionCode.DHU
  • EDNSOptionCode.ECS
  • EDNSOptionCode.N3U
  • EDNSOptionCode.DAU
  • EDNSOptionCode.TCPKEEPALIVE
  • EDNSOptionCode.COOKIE
  • EDNSOptionCode.PADDING
  • EDNSOptionCode.KEYTAG
  • EDNSOptionCode.NSID
  • EDNSOptionCode.CHAIN
  • EDNSOptionCode.EXPIRE

Reference: https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-11

DNS Packet Sections

These constants represent the section in the DNS Packet.

  • DNSSection.Question
  • DNSSection.Answer
  • DNSSection.Authority
  • DNSSection.Additional

DNSAction

These constants represent an Action that can be returned from LuaAction() functions.

  • DNSAction.Allow: let the query pass, skipping other rules
  • DNSAction.Delay: delay the response for the specified milliseconds (UDP-only), continue to the next rule
  • DNSAction.Drop: drop the query
  • DNSAction.HeaderModify: indicate that the query has been turned into a response
  • DNSAction.None: continue to the next rule
  • DNSAction.NoOp: continue to the next rule (used for Dynamic Block actions where None has a different meaning)
  • DNSAction.Nxdomain: return a response with a NXDomain rcode
  • DNSAction.Pool: use the specified pool to forward this query
  • DNSAction.Refused: return a response with a Refused rcode
  • DNSAction.ServFail: return a response with a ServFail rcode
  • DNSAction.Spoof: spoof the response using the supplied IPv4 (A), IPv6 (AAAA) or string (CNAME) value
  • DNSAction.Truncate: truncate the response
  • DNSAction.NoRecurse: set rd=0 on the query

DNSQType

Changed in version 1.3.0: The prefix is changed from dnsdist. to DNSQType.

All named QTypes are available as constants, prefixed with DNSQType., e.g.:

  • DNSQType.AAAA
  • DNSQType.AXFR
  • DNSQType.A
  • DNSQType.NS
  • DNSQType.SOA
  • etc.

DNSResponseAction

These constants represent an Action that can be returned from LuaResponseAction() functions.

  • DNSResponseAction.Allow: let the response pass, skipping other rules
  • DNSResponseAction.Delay: delay the response for the specified milliseconds (UDP-only), continue to the next rule
  • DNSResponseAction.Drop: drop the response
  • DNSResponseAction.HeaderModify: indicate that the query has been turned into a response
  • DNSResponseAction.None: continue to the next rule
  • DNSResponseAction.ServFail: return a response with a ServFail rcode