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; config options
server:
module-config: "validator iterator"
qname-minimisation: "no"
minimal-responses: no
serve-expired: yes
serve-expired-client-timeout: 1
serve-expired-reply-ttl: 123
log-servfail: yes
ede: yes
ede-serve-expired: yes
stub-zone:
name: "example.com"
stub-addr: 1.2.3.4
CONFIG_END
SCENARIO_BEGIN Test serve-expired with client-timeout and a SERVFAIL upstream reply
; Scenario overview:
; - query for example.com. IN A
; - check that we get an answer for example.com. IN A with the correct TTL
; - query again right after the TTL expired
; - answer from upstream is servfail
; - (expired cached answer will not be replaced, instead marked as unresolvable for NORR_TTL(5))
; - check that we get the expired cached answer
; - query again (the answer is available on the upstream server now)
; - check that we get the immediate expired answer back instead
; - (the upstream query does happen after the expired reply and updates the cache)
; - query again (the upstream has no answer)
; - check that we get the freshly cached answer
; ns.example.com.
RANGE_BEGIN 0 20
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. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN A
SECTION ANSWER
example.com. 10 IN A 5.6.7.8
SECTION AUTHORITY
example.com. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
RANGE_END
; ns.example.com.
RANGE_BEGIN 30 40
ADDRESS 1.2.3.4
; response to A query
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA SERVFAIL
SECTION QUESTION
example.com. IN A
ENTRY_END
RANGE_END
; ns.example.com.
RANGE_BEGIN 50 60
ADDRESS 1.2.3.4
; response to A query
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN A
SECTION ANSWER
example.com. 10 IN A 5.6.7.8
SECTION AUTHORITY
example.com. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
RANGE_END
; Query with RD flag
STEP 1 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
example.com. IN A
ENTRY_END
; Check that we got the correct answer (should be cached)
STEP 10 CHECK_ANSWER
ENTRY_BEGIN
MATCH all ttl
REPLY QR RD RA NOERROR
SECTION QUESTION
example.com. IN A
SECTION ANSWER
example.com. 10 IN A 5.6.7.8
SECTION AUTHORITY
example.com. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
; Wait for the TTL to expire
STEP 11 TIME_PASSES ELAPSE 11
; Query again
STEP 30 QUERY
ENTRY_BEGIN
REPLY RD DO
SECTION QUESTION
example.com. IN A
ENTRY_END
; Check that we got a stale answer because of the upstream SERVFAIL
STEP 40 CHECK_ANSWER
ENTRY_BEGIN
MATCH all ttl ede=3
REPLY QR RD RA DO NOERROR
SECTION QUESTION
example.com. IN A
SECTION ANSWER
example.com. 123 IN A 5.6.7.8
SECTION AUTHORITY
example.com. 123 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. 123 IN A 1.2.3.4
ENTRY_END
; Query again
STEP 50 QUERY
ENTRY_BEGIN
REPLY RD DO
SECTION QUESTION
example.com. IN A
ENTRY_END
; Allow for upstream query to resolve.
STEP 51 TRAFFIC
; Check that we got an immediate stale answer because of the previous failure,
; regardless if upstream has the answer already in this range. The query will
; be resolved after the immediate cached answer and will cache the result.
STEP 60 CHECK_ANSWER
ENTRY_BEGIN
MATCH all ttl ede=3
REPLY QR RD RA DO NOERROR
SECTION QUESTION
example.com. IN A
SECTION ANSWER
example.com. 123 IN A 5.6.7.8
SECTION AUTHORITY
example.com. 123 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. 123 IN A 1.2.3.4
ENTRY_END
; Query again
STEP 70 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
example.com. IN A
ENTRY_END
; Check that we got the cached updated answer from the previous step since
; there is no upstream in this range.
STEP 80 CHECK_ANSWER
ENTRY_BEGIN
MATCH all ttl
REPLY QR RD RA NOERROR
SECTION QUESTION
example.com. IN A
SECTION ANSWER
example.com. 10 IN A 5.6.7.8
SECTION AUTHORITY
example.com. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
SCENARIO_END
|
