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; Check if an expired SERVFAIL answer stored in the global cache does not block
; ECS queries to reach the ECS cache.
server:
trust-anchor-signaling: no
target-fetch-policy: "0 0 0 0 0"
send-client-subnet: 1.2.3.4
max-client-subnet-ipv4: 21
module-config: "subnetcache iterator"
verbosity: 3
access-control: 127.0.0.1 allow_snoop
qname-minimisation: no
minimal-responses: no
serve-expired: yes
prefetch: yes
stub-zone:
name: "example.com."
stub-addr: 1.2.3.4
CONFIG_END
SCENARIO_BEGIN Test that expired SERVFAIL in global cache does not block clients to reach the ECS cache
; ns.example.com.
RANGE_BEGIN 0 10
ADDRESS 1.2.3.4
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ENTRY_END
; response to query of interest
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR SERVFAIL
SECTION QUESTION
www.example.com. IN A
ENTRY_END
RANGE_END
; ns.example.com.
RANGE_BEGIN 11 100
ADDRESS 1.2.3.4
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ENTRY_END
; response to query of interest
ENTRY_BEGIN
MATCH opcode qtype qname ednsdata
ADJUST copy_id copy_ednsdata_assume_clientsubnet
REPLY QR NOERROR
SECTION QUESTION
www.example.com. IN A
SECTION ANSWER
www.example.com. 10 IN A 10.20.30.40
SECTION AUTHORITY
example.com. IN NS ns.example.com.
SECTION ADDITIONAL
HEX_EDNSDATA_BEGIN
; client is 127.0.0.1
00 08 ; OPC
00 05 ; option length
00 01 ; Family
08 00 ; source mask, scopemask
7f ; address
HEX_EDNSDATA_END
ns.example.com. IN A 1.2.3.4
ENTRY_END
RANGE_END
STEP 1 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
www.example.com. IN A
ENTRY_END
; This answer should be in the global cache
STEP 2 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA SERVFAIL
SECTION QUESTION
www.example.com. IN A
ENTRY_END
; Bring the cached SERVFAIL to prefetch time
STEP 10 TIME_PASSES ELAPSE 5
STEP 11 QUERY
ENTRY_BEGIN
REPLY RD DO
SECTION QUESTION
www.example.com. IN A
SECTION ADDITIONAL
HEX_EDNSDATA_BEGIN
00 08 00 05 ; OPC, optlen
00 01 08 00 ; ip4, source 8, scope 0
7f ; 127.0.0.0/8
HEX_EDNSDATA_END
ENTRY_END
; This answer was cached but a prefetch was triggerred
STEP 12 CHECK_ANSWER
ENTRY_BEGIN
MATCH opcode qtype qname
REPLY QR RD RA SERVFAIL
SECTION QUESTION
www.example.com. IN A
ENTRY_END
; Wait for the SERVFAIL to expire
STEP 13 TIME_PASSES ELAPSE 2
; Query again to verify that the record was prefetched and stored in the ECS
; cache (because the server replied with ECS this time)
STEP 14 QUERY
ENTRY_BEGIN
REPLY RD DO
SECTION QUESTION
www.example.com. IN A
SECTION ADDITIONAL
HEX_EDNSDATA_BEGIN
00 08 00 05 ; OPC, optlen
00 01 08 00 ; ip4, source 8, scope 0
7f ; 127.0.0.0/8
HEX_EDNSDATA_END
ENTRY_END
; This record came from the ECS cache
STEP 15 CHECK_ANSWER
ENTRY_BEGIN
MATCH all ttl
REPLY QR RD RA DO NOERROR
SECTION QUESTION
www.example.com. IN A
SECTION ANSWER
www.example.com. 8 IN A 10.20.30.40
SECTION AUTHORITY
example.com. 3598 IN NS ns.example.com.
SECTION ADDITIONAL
HEX_EDNSDATA_BEGIN
00 08 00 05 ; OPC, optlen
00 01 08 08 ; ip4, source 8, scope 0
7f ; 127.0.0.0/8
HEX_EDNSDATA_END
ns.example.com. 3598 IN A 1.2.3.4
ENTRY_END
SCENARIO_END
|
