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- Ignore expired error responses.

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This commit is contained in:
George Thessalonikefs
2022-11-22 17:44:55 +01:00
parent f72116883b
commit 896f7a8306
8 changed files with 337 additions and 16 deletions
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testdata/fwd_0ttlservfail.rpl
Vendored
+2 -1
View File
@@ -2,6 +2,7 @@
; config options go here.
server:
serve-expired: yes
prefetch: yes
forward-zone: name: "." forward-addr: 216.0.0.1
CONFIG_END
@@ -45,7 +46,7 @@ SECTION ANSWER
ENTRY_END
; enough to pass by the TTL of the servfail answer in cache
STEP 50 TIME_PASSES ELAPSE 40
STEP 50 TIME_PASSES ELAPSE 5
; this query triggers a prefetch
STEP 210 QUERY
testdata/serve_expired_cached_servfail.rpl
Vendored
+130
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@@ -0,0 +1,130 @@
; config options
server:
module-config: "validator iterator"
qname-minimisation: "no"
minimal-responses: no
serve-expired: yes
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
; - answer from upstream is SERVFAIL; will be cached for NORR_TTL(5)
; - check that the client gets the SERVFAIL; also cached
; - query again right after the TTL expired
; - cached SERVFAIL should be ignored and upstream queried
; - check that we get the correct answer
; ns.example.com.
RANGE_BEGIN 0 20
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 30 100
ADDRESS 1.2.3.4
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. 10 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
; Query with RD flag
STEP 0 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
example.com. IN A
ENTRY_END
; Check that we get the SERVFAIL (will be cached)
STEP 10 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA SERVFAIL
SECTION QUESTION
example.com. IN A
ENTRY_END
; Query again
STEP 20 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
example.com. IN A
ENTRY_END
; Check that we get the cached SERVFAIL
STEP 30 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA SERVFAIL
SECTION QUESTION
example.com. IN A
ENTRY_END
; Wait for the SERVFAIL to expire
STEP 31 TIME_PASSES ELAPSE 6
; Query again
STEP 40 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
example.com. IN A
ENTRY_END
; Check that we got the correct answer
STEP 50 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
testdata/serve_expired_servfail.rpl → testdata/serve_expired_client_timeout_servfail.rpl
Vendored
+10 -10
View File
@@ -4,7 +4,7 @@ server:
qname-minimisation: "no"
minimal-responses: no
serve-expired: yes
serve-expired-client-timeout: 1800
serve-expired-client-timeout: 1
serve-expired-reply-ttl: 123
log-servfail: yes
ede: yes
@@ -32,11 +32,11 @@ RANGE_BEGIN 0 20
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN NS
example.com. 10 IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
example.com. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
ENTRY_BEGIN
@@ -48,14 +48,14 @@ RANGE_BEGIN 0 20
SECTION ANSWER
example.com. 10 IN A 5.6.7.8
SECTION AUTHORITY
example.com. IN NS ns.example.com.
example.com. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
RANGE_END
; ns.example.com.
RANGE_BEGIN 30 100
RANGE_BEGIN 30 70
ADDRESS 1.2.3.4
; response to A query
ENTRY_BEGIN
@@ -85,13 +85,13 @@ ENTRY_BEGIN
SECTION ANSWER
example.com. 10 IN A 5.6.7.8
SECTION AUTHORITY
example.com. IN NS ns.example.com.
example.com. 10 IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ns.example.com. 10 IN A 1.2.3.4
ENTRY_END
; Wait for the TTL to expire
STEP 11 TIME_PASSES ELAPSE 3601
STEP 11 TIME_PASSES ELAPSE 11
; Query again
STEP 30 QUERY
testdata/subnet_cached_servfail.crpl
Vendored
+167
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@@ -0,0 +1,167 @@
; 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