Electroneum
iter_resptype.h File Reference
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Enumerations

enum  response_type {
  RESPONSE_TYPE_UNTYPED = 0, RESPONSE_TYPE_ANSWER, RESPONSE_TYPE_REFERRAL, RESPONSE_TYPE_CNAME,
  RESPONSE_TYPE_THROWAWAY, RESPONSE_TYPE_LAME, RESPONSE_TYPE_REC_LAME
}
 

Functions

enum response_type response_type_from_cache (struct dns_msg *msg, struct query_info *request)
 
enum response_type response_type_from_server (int rdset, struct dns_msg *msg, struct query_info *request, struct delegpt *dp)
 

Detailed Description

This file defines the response type. DNS Responses can be classified as one of the response types.

Definition in file iter_resptype.h.

Enumeration Type Documentation

◆ response_type

The response type is used to interpret the response.

Enumerator
RESPONSE_TYPE_UNTYPED 

'untyped' means that the type of this response hasn't been assigned.

RESPONSE_TYPE_ANSWER 

'answer' means that the response terminates the resolution process.

RESPONSE_TYPE_REFERRAL 

'delegation' means that the response is a delegation.

RESPONSE_TYPE_CNAME 

'cname' means that the response is a cname without the final answer, and thus must be restarted.

RESPONSE_TYPE_THROWAWAY 

'throwaway' means that this particular response should be discarded and the next nameserver should be contacted

RESPONSE_TYPE_LAME 

'lame' means that this particular response indicates that the nameserver knew nothing about the question.

RESPONSE_TYPE_REC_LAME 

Recursion lame means that the nameserver is some sort of open recursor, and not authoritative for the question. It may know something, but not authoritatively.

Definition at line 52 of file iter_resptype.h.

Function Documentation

◆ response_type_from_cache()

enum response_type response_type_from_cache ( struct dns_msg msg,
struct query_info request 
)

Classifies a response message from cache based on the current request. Note that this routine assumes that THROWAWAY or LAME responses will not occur. Also, it will not detect REFERRAL type messages, since those are (currently) automatically classified based on how they came from the cache (findDelegation() instead of lookup()).

Parameters
msgthe message from the cache.
requestthe request that generated the response.
Returns
the response type (CNAME or ANSWER).

◆ response_type_from_server()

enum response_type response_type_from_server ( int  rdset,
struct dns_msg msg,
struct query_info request,
struct delegpt dp 
)

Classifies a response message (from the wire) based on the current request.

NOTE: currently this routine uses the AA bit in the response to help distinguish between some non-standard referrals and answers. It also relies somewhat on the originating zone to be accurate (for lameness detection, mostly).

Parameters
rdsetif RD bit was sent in query sent by unbound.
msgthe message from the cache.
requestthe request that generated the response.
dpThe delegation point that was being queried when the response was returned.
Returns
the response type (CNAME or ANSWER).