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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.
348 lines
6.9 KiB
Text
348 lines
6.9 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-reply-ttl: 123
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; at least one second, so we can time skip past the timer in the
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; testbound script steps, but also reply within the time.
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serve-expired-client-timeout: 1200
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module-config: "cachedb iterator"
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discard-timeout: 3000
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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-client-timeout.
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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 60
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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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; ns2.example.com. - after a change
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RANGE_BEGIN 80 90
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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 1.2.3.6
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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 1.2.3.7
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ENTRY_END
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RANGE_END
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; ns2.example.com. - steps 90-120 not responding.
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; ns2.example.com. - after a change
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RANGE_BEGIN 130 140
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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 1.2.3.8
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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 1.2.3.9
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ENTRY_END
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RANGE_END
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; ns2.example.com. - steps 150-160 not responding.
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; ns2.example.com. - after a change
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RANGE_BEGIN 170 200
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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 1.2.3.10
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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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www2.example.com. 100 IN A 1.2.3.11
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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.
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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.
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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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; www.example.com and www2.example.com are in cache, www2 in cachedb.
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STEP 40 FLUSH_MESSAGE www2.example.com. IN A
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; now www in cache, www2 not in cache, www2 in cachedb.
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; because of the client timeout, it should be able to use the
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; response from cachedb for www2.
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; make 2 seconds pass to decrement the TTL on the response,
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; the upstream TTL would be 200, cachedb 198.
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STEP 48 TIME_PASSES ELAPSE 2
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STEP 50 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 60 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. 98 IN A 1.2.3.5
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ENTRY_END
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; make both cache and cachedb expired
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STEP 70 TIME_PASSES ELAPSE 200
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; www and www2 expired in cache, www2 expired in cachedb.
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; the query should now try to resolve and complete within the
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; client timeout, and return the upstream version.
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; the upstream is changed to give a different one now.
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STEP 80 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 90 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 1.2.3.7
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ENTRY_END
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; expire the data again
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STEP 100 TIME_PASSES ELAPSE 200
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; the query should now try to resolve, but the upstream is not
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; responsive for several testbound steps. When the timer expires,
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; the expired answer should be returned.
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; www2 expired in cache and www2 expired in cachedb.
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STEP 110 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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; make 2 seconds pass to go past the client timeout
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STEP 112 TIME_PASSES ELAPSE 2
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STEP 120 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 1.2.3.7
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ENTRY_END
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; make traffic flow to resolve the query, server responds.
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STEP 130 TRAFFIC
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; expire the data again
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STEP 140 TIME_PASSES ELAPSE 200
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; The client query tries to resolve, but gets no immediate answer,
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; so the expired data is used. But the expired data is in cache and
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; the query is not in cachedb.
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STEP 150 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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; make 2 seconds pass to go past the client timeout
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STEP 152 TIME_PASSES ELAPSE 2
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STEP 160 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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; make traffic flow to resolve the query, server responds.
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STEP 170 TRAFFIC
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; now the client query tries to resolve, and completes within the client
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; timeout, but there is expired data in cache but not in cachedb.
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STEP 180 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 190 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 1.2.3.11
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ENTRY_END
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SCENARIO_END
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