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- Fix to ignore out-of-zone DNAME records for CNAME synthesis. Thanks

Browse Source 
to Yuxiao Wu, Yiyi Wang, Zhang Chao, Baojun Liu, and Haixin Duan from
  Tsinghua University.
This commit is contained in:
Yorgos Thessalonikefs
2026-03-13 11:28:32 +01:00
parent 18029fc44f
commit 4672fa5b53
3 changed files with 132 additions and 3 deletions
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testdata/iter_scrub_dname_out_of_zone.rpl
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+122
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; config options
server:
harden-referral-path: no
target-fetch-policy: "0 0 0 0 0"
qname-minimisation: "no"
minimal-responses: no
iter-scrub-promiscuous: no
stub-zone:
name: "."
stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
CONFIG_END
SCENARIO_BEGIN Test scrub of out-of-zone DNAME in answer section
STEP 10 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
x.y.example.com. IN A
ENTRY_END
; root prime is sent
STEP 20 CHECK_OUT_QUERY
ENTRY_BEGIN
MATCH qname qtype opcode
SECTION QUESTION
. IN NS
ENTRY_END
STEP 30 REPLY
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
. IN NS
SECTION ANSWER
. IN NS K.ROOT-SERVERS.NET.
SECTION ADDITIONAL
K.ROOT-SERVERS.NET. IN A 193.0.14.129
ENTRY_END
; query sent to root server
STEP 40 CHECK_OUT_QUERY
ENTRY_BEGIN
MATCH qname qtype opcode
SECTION QUESTION
x.y.example.com. IN A
ENTRY_END
STEP 50 REPLY
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
x.y.example.com. IN A
SECTION AUTHORITY
com. IN NS a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net. IN A 192.5.6.30
ENTRY_END
; query sent to .com server
STEP 60 CHECK_OUT_QUERY
ENTRY_BEGIN
MATCH qname qtype opcode
SECTION QUESTION
x.y.example.com. IN A
ENTRY_END
STEP 70 REPLY
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
x.y.example.com. IN A
SECTION AUTHORITY
example.com. IN NS ns1.example.com.
SECTION ADDITIONAL
ns1.example.com. IN A 168.192.2.2
ENTRY_END
STEP 80 CHECK_OUT_QUERY
ENTRY_BEGIN
MATCH qname qtype opcode
SECTION QUESTION
x.y.example.com. IN A
ENTRY_END
STEP 90 REPLY
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
x.y.example.com. IN A
SECTION ANSWER
com. DNAME z.example.com.
SECTION AUTHORITY
example.com. IN NS ns1.example.com.
SECTION ADDITIONAL
ns1.example.com. IN A 168.192.2.2
ENTRY_END
; answer to first query
; nodata answer since the DNAME is ignored for synthesis and scrubbed
; all together.
STEP 120 CHECK_ANSWER
ENTRY_BEGIN
MATCH all ttl
REPLY QR RD RA
SECTION QUESTION
x.y.example.com. IN A
SECTION ANSWER
SECTION AUTHORITY
example.com. IN NS ns1.example.com.
SECTION ADDITIONAL
ns1.example.com. IN A 168.192.2.2
ENTRY_END
SCENARIO_END