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https://github.com/NLnetLabs/unbound.git
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73e408f1d0
- Cached messages that reach 0 TTL are considered expired. This prevents Unbound itself from issuing replies with TTL 0 and possibly causing a thundering herd at the last second. Upstream replies of TTL 0 still get the usual pass-through but they are not considered for caching from Unbound or any of its caching modules. - 'serve-expired-reply-ttl' is changed and is now capped by the original TTL value of the record to try and make some sense when replying with expired records. - TTL decoding was updated to adhere to RFC8767 section 4 where a set high-order bit means the value is positive instead of 0.
263 lines
4.6 KiB
Text
263 lines
4.6 KiB
Text
; config options
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server:
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target-fetch-policy: "0 0 0 0 0"
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qname-minimisation: no
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minimal-responses: no
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serve-expired: yes
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serve-expired-client-timeout: 0
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serve-expired-reply-ttl: 123
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module-config: "cachedb iterator"
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ede: yes
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ede-serve-expired: yes
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cachedb:
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backend: "testframe"
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secret-seed: "testvalue"
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cachedb-check-when-serve-expired: yes
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stub-zone:
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name: "."
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stub-addr: 193.0.14.129
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CONFIG_END
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SCENARIO_BEGIN Test cachedb and serve-expired-reply-ttl.
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; K.ROOT-SERVERS.NET.
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RANGE_BEGIN 0 400
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ADDRESS 193.0.14.129
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ENTRY_BEGIN
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MATCH opcode qtype qname
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ADJUST copy_id
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REPLY QR NOERROR
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SECTION QUESTION
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. IN NS
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SECTION ANSWER
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. IN NS K.ROOT-SERVERS.NET.
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SECTION ADDITIONAL
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K.ROOT-SERVERS.NET. IN A 193.0.14.129
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ENTRY_END
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ENTRY_BEGIN
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MATCH opcode subdomain
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ADJUST copy_id copy_query
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REPLY QR NOERROR
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SECTION QUESTION
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com. IN NS
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SECTION AUTHORITY
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com. IN NS a.gtld-servers.net.
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SECTION ADDITIONAL
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a.gtld-servers.net. IN A 192.5.6.30
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ENTRY_END
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RANGE_END
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; a.gtld-servers.net.
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RANGE_BEGIN 0 400
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ADDRESS 192.5.6.30
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ENTRY_BEGIN
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MATCH opcode subdomain
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ADJUST copy_id copy_query
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REPLY QR NOERROR
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SECTION QUESTION
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example.com. IN NS
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SECTION AUTHORITY
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example.com. IN NS ns2.example.com.
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SECTION ADDITIONAL
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ns2.example.com. IN A 1.2.3.5
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ENTRY_END
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ENTRY_BEGIN
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MATCH opcode subdomain
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ADJUST copy_id copy_query
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REPLY QR NOERROR
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SECTION QUESTION
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foo.com. IN NS
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SECTION AUTHORITY
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foo.com. IN NS ns.example.com.
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ENTRY_END
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RANGE_END
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; ns2.example.com.
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RANGE_BEGIN 0 400
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ADDRESS 1.2.3.5
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ENTRY_BEGIN
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MATCH opcode qname qtype
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REPLY QR AA NOERROR
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SECTION QUESTION
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www.example.com. IN A
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SECTION ANSWER
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www.example.com. 200 IN A 1.2.3.4
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ENTRY_END
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ENTRY_BEGIN
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MATCH opcode qname qtype
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REPLY QR AA NOERROR
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SECTION QUESTION
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www2.example.com. IN A
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SECTION ANSWER
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; TTL lower than serve-expired-reply-ttl on purpose
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www2.example.com. 100 IN A 1.2.3.5
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ENTRY_END
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RANGE_END
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; make time not 0
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STEP 2 TIME_PASSES ELAPSE 212
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; Get an entry in cache, to make it expired.
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STEP 4 QUERY
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ENTRY_BEGIN
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REPLY RD
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SECTION QUESTION
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www.example.com. IN A
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ENTRY_END
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; get the answer for it
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STEP 10 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all
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REPLY QR RD RA NOERROR
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SECTION QUESTION
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www.example.com. IN A
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SECTION ANSWER
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www.example.com. 200 IN A 1.2.3.4
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ENTRY_END
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; Get another query in cache to make it expired.
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STEP 20 QUERY
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ENTRY_BEGIN
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REPLY RD
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SECTION QUESTION
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www2.example.com. IN A
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ENTRY_END
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; get the answer for it
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STEP 30 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all
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REPLY QR RD RA NOERROR
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SECTION QUESTION
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www2.example.com. IN A
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SECTION ANSWER
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www2.example.com. 100 IN A 1.2.3.5
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ENTRY_END
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; it is now expired
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STEP 40 TIME_PASSES ELAPSE 200
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; cache is expired, and cachedb is expired.
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STEP 50 QUERY
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ENTRY_BEGIN
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REPLY RD DO
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SECTION QUESTION
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www2.example.com. IN A
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ENTRY_END
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STEP 60 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all ttl ede=3
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REPLY QR RD RA DO NOERROR
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SECTION QUESTION
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www2.example.com. IN A
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SECTION ANSWER
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www2.example.com. 100 IN A 1.2.3.5
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ENTRY_END
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; got an answer from upstream
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STEP 61 QUERY
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ENTRY_BEGIN
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REPLY RD
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SECTION QUESTION
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www2.example.com. IN A
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ENTRY_END
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STEP 62 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all ttl
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REPLY QR RD RA NOERROR
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SECTION QUESTION
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www2.example.com. IN A
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SECTION ANSWER
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www2.example.com. 100 IN A 1.2.3.5
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ENTRY_END
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; cache is expired, cachedb has no answer
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STEP 70 QUERY
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ENTRY_BEGIN
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REPLY RD DO
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SECTION QUESTION
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www.example.com. IN A
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ENTRY_END
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STEP 80 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all ttl ede=3
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REPLY QR RD RA DO NOERROR
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SECTION QUESTION
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www.example.com. IN A
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SECTION ANSWER
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www.example.com. 123 IN A 1.2.3.4
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ENTRY_END
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STEP 90 TRAFFIC
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; the entry should be refreshed in cache now.
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; cache is valid and cachedb is valid.
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STEP 100 QUERY
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ENTRY_BEGIN
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REPLY RD
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SECTION QUESTION
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www.example.com. IN A
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ENTRY_END
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STEP 110 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all ttl
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REPLY QR RD RA NOERROR
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SECTION QUESTION
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www.example.com. IN A
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SECTION ANSWER
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www.example.com. 200 IN A 1.2.3.4
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ENTRY_END
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; make both cache and cachedb expired.
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STEP 120 TIME_PASSES ELAPSE 200
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STEP 130 FLUSH_MESSAGE www.example.com. IN A
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; cache has no entry and cachedb is expired.
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STEP 140 QUERY
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ENTRY_BEGIN
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REPLY RD DO
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SECTION QUESTION
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www.example.com. IN A
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ENTRY_END
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STEP 150 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all ttl ede=3
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REPLY QR RD RA DO NOERROR
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SECTION QUESTION
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www.example.com. IN A
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SECTION ANSWER
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www.example.com. 123 IN A 1.2.3.4
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ENTRY_END
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; the name is resolved
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STEP 160 TRAFFIC
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; the resolve name has been updated.
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STEP 170 QUERY
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ENTRY_BEGIN
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REPLY RD
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SECTION QUESTION
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www.example.com. IN A
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ENTRY_END
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STEP 180 CHECK_ANSWER
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ENTRY_BEGIN
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MATCH all ttl
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REPLY QR RD RA NOERROR
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SECTION QUESTION
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www.example.com. IN A
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SECTION ANSWER
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www.example.com. 200 IN A 1.2.3.4
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ENTRY_END
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SCENARIO_END
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