iter_resptype.c File Reference

This file defines the response type. More...

#include "config.h"
#include "iterator/iter_resptype.h"
#include "iterator/iter_delegpt.h"
#include "services/cache/dns.h"
#include "util/net_help.h"
#include "util/data/dname.h"

Functions

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.
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.


Detailed Description

This file defines the response type.

DNS Responses can be classified as one of the response types.


Function Documentation

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:
msg,: the message from the cache.
request,: the request that generated the response.
Returns:
the response type (CNAME or ANSWER).

References reply_info::an_numrrsets, packed_rrset_key::dname, reply_info::flags, FLAGS_GET_RCODE, get_cname_target(), query_info::qclass, query_info::qname, query_info::qname_len, query_info::qtype, query_dname_compare(), dns_msg::rep, RESPONSE_TYPE_ANSWER, RESPONSE_TYPE_CNAME, ub_packed_rrset_key::rk, packed_rrset_key::rrset_class, reply_info::rrsets, and packed_rrset_key::type.

Referenced by processInitRequest().

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:
rdset,: if RD bit was sent in query sent by unbound.
msg,: the message from the cache.
request,: the request that generated the response.
dp,: The delegation point that was being queried when the response was returned.
Returns:
the response type (CNAME or ANSWER).

References reply_info::an_numrrsets, BIT_AA, BIT_RA, packed_rrset_key::dname, dname_strict_subdomain_c(), dname_subdomain_c(), reply_info::flags, FLAGS_GET_RCODE, get_cname_target(), delegpt::name, delegpt::namelen, reply_info::ns_numrrsets, query_info::qclass, query_info::qname, query_info::qname_len, query_info::qtype, query_dname_compare(), dns_msg::rep, RESPONSE_TYPE_ANSWER, RESPONSE_TYPE_CNAME, RESPONSE_TYPE_LAME, RESPONSE_TYPE_REC_LAME, RESPONSE_TYPE_REFERRAL, RESPONSE_TYPE_THROWAWAY, ub_packed_rrset_key::rk, packed_rrset_key::rrset_class, reply_info::rrsets, and packed_rrset_key::type.

Referenced by processPrimeResponse(), and processQueryResponse().


Generated on Tue Oct 13 06:45:49 2009 for unbound by  doxygen 1.5.9