Skip to content

D
deckard
Commit 41f626e4 authored by Ivana Krumlova's avatar Ivana Krumlova
Browse files
Options

Resolver: more unbound .rpl tests

parent d51ca57a
Pipeline #43312 failed with stage
    in 3 minutes and 30 seconds
    Expand all Hide whitespace changes
    Inline Side-by-side
    Showing with 2357 additions and 0 deletions
    sets/resolver/black_data.rpl 0 → 100644
    View file @ 41f626e4
    This diff is collapsed.
    sets/resolver/black_prime.rpl 0 → 100644
    View file @ 41f626e4
    This diff is collapsed.
    sets/resolver/iter_ds_locate_ns.rpl 0 → 100644
    View file @ 41f626e4
    ; config options
    ;server:
    ; target-fetch-policy: "0 0 0 0 0"
    ;stub-zone:
    ; name: "."
    stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
    CONFIG_END
    SCENARIO_BEGIN Test locate of NS records for parent nameservers of DS
    ; K.ROOT-SERVERS.NET.
    RANGE_BEGIN 0 100
    ADDRESS 193.0.14.129
    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
    ; content of root-servers.net
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    root-servers.net. IN NS
    SECTION ANSWER
    root-servers.net. IN NS K.ROOT-SERVERS.NET.
    SECTION ADDITIONAL
    K.ROOT-SERVERS.NET. IN A 193.0.14.129
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    k.root-servers.net. IN A
    SECTION ANSWER
    K.ROOT-SERVERS.NET. IN A 193.0.14.129
    SECTION AUTHORITY
    root-servers.net. IN NS K.ROOT-SERVERS.NET.
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    k.root-servers.net. IN AAAA
    SECTION ANSWER
    SECTION AUTHORITY
    root-servers.net. IN SOA K.ROOT-SERVERS.NET. hostmaster. 1 2 3 4 5
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    root-servers.net. IN DS
    SECTION ANSWER
    SECTION AUTHORITY
    root-servers.net. IN SOA K.ROOT-SERVERS.NET. hostmaster. 1 2 3 4 5
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    net. IN A
    SECTION AUTHORITY
    net. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    RANGE_END
    ; a.gtld-servers.net.
    RANGE_BEGIN 0 100
    ADDRESS 192.5.6.30
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    net. IN NS
    SECTION ANSWER
    net. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    root-servers.net. IN DS
    SECTION AUTHORITY
    net. IN SOA a.gtld-servers.net. hostmaster. 2 3 4 5 6
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    root-servers.net. IN A
    SECTION AUTHORITY
    root-servers.net. IN NS K.ROOT-SERVERS.NET.
    SECTION ADDITIONAL
    K.ROOT-SERVERS.NET. IN A 193.0.14.129
    ENTRY_END
    RANGE_END
    STEP 1 QUERY
    ENTRY_BEGIN
    REPLY RD
    SECTION QUESTION
    root-servers.net. IN DS
    ENTRY_END
    ; recursion happens here.
    STEP 10 CHECK_ANSWER
    ENTRY_BEGIN
    MATCH opcode qname flags rcode question answer
    REPLY QR RD RA NOERROR
    SECTION QUESTION
    root-servers.net. IN DS
    SECTION ANSWER
    SECTION AUTHORITY
    net. IN SOA a.gtld-servers.net. hostmaster. 2 3 4 5 6
    SECTION ADDITIONAL
    ENTRY_END
    SCENARIO_END
    sets/resolver/iter_ds_locate_ns_nosoa.rpl 0 → 100644
    View file @ 41f626e4
    ; config options
    ;server:
    ; target-fetch-policy: "0 0 0 0 0"
    ;stub-zone:
    ; name: "."
    stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
    CONFIG_END
    SCENARIO_BEGIN Test locate of NS records for DS without a SOA record
    ; K.ROOT-SERVERS.NET.
    RANGE_BEGIN 0 100
    ADDRESS 193.0.14.129
    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
    ; content of root-servers.net
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    root-servers.net. IN NS
    SECTION ANSWER
    root-servers.net. IN NS K.ROOT-SERVERS.NET.
    SECTION ADDITIONAL
    K.ROOT-SERVERS.NET. IN A 193.0.14.129
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    k.root-servers.net. IN A
    SECTION ANSWER
    K.ROOT-SERVERS.NET. IN A 193.0.14.129
    SECTION AUTHORITY
    root-servers.net. IN NS K.ROOT-SERVERS.NET.
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    k.root-servers.net. IN AAAA
    SECTION ANSWER
    SECTION AUTHORITY
    root-servers.net. IN SOA K.ROOT-SERVERS.NET. hostmaster. 1 2 3 4 5
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    root-servers.net. IN DS
    SECTION ANSWER
    SECTION AUTHORITY
    ;root-servers.net. IN SOA K.ROOT-SERVERS.NET. hostmaster. 1 2 3 4 5
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    net. IN A
    SECTION AUTHORITY
    net. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    RANGE_END
    ; a.gtld-servers.net.
    RANGE_BEGIN 0 100
    ADDRESS 192.5.6.30
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    net. IN NS
    SECTION ANSWER
    net. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR AA NOERROR
    SECTION QUESTION
    root-servers.net. IN DS
    SECTION AUTHORITY
    net. IN SOA a.gtld-servers.net. hostmaster. 2 3 4 5 6
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    root-servers.net. IN A
    SECTION AUTHORITY
    root-servers.net. IN NS K.ROOT-SERVERS.NET.
    SECTION ADDITIONAL
    K.ROOT-SERVERS.NET. IN A 193.0.14.129
    ENTRY_END
    RANGE_END
    STEP 1 QUERY
    ENTRY_BEGIN
    REPLY RD
    SECTION QUESTION
    root-servers.net. IN DS
    ENTRY_END
    ; recursion happens here.
    STEP 10 CHECK_ANSWER
    ENTRY_BEGIN
    MATCH opcode qname flags rcode question answer
    REPLY QR RD RA NOERROR
    SECTION QUESTION
    root-servers.net. IN DS
    SECTION ANSWER
    SECTION AUTHORITY
    net. IN SOA a.gtld-servers.net. hostmaster. 2 3 4 5 6
    SECTION ADDITIONAL
    ENTRY_END
    SCENARIO_END
    sets/resolver/iter_pcdiff.rpl 0 → 100644
    View file @ 41f626e4
    ; config options
    ;server:
    ; target-fetch-policy: "0 0 0 0 0"
    ;stub-zone:
    ; name: "."
    stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
    CONFIG_END
    SCENARIO_BEGIN Test resolution with recursion and parent child differ.
    ; and the child gives bad information.
    ; K.ROOT-SERVERS.NET.
    RANGE_BEGIN 0 100
    ADDRESS 193.0.14.129
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR 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
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    com. IN NS
    SECTION AUTHORITY
    com. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    net. IN NS
    SECTION AUTHORITY
    net. IN NS e.gtld-servers.net.
    SECTION ADDITIONAL
    e.gtld-servers.net. IN A 192.12.94.30
    ENTRY_END
    RANGE_END
    ; a.gtld-servers.net.
    RANGE_BEGIN 0 100
    ADDRESS 192.5.6.30
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR NOERROR
    SECTION QUESTION
    com. IN NS
    SECTION ANSWER
    com. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    example.com. IN NS
    SECTION AUTHORITY
    example.com. IN NS ns.example.net.
    ENTRY_END
    RANGE_END
    ; e.gtld-servers.net.
    RANGE_BEGIN 0 100
    ADDRESS 192.12.94.30
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR NOERROR
    SECTION QUESTION
    net. IN NS
    SECTION ANSWER
    net. IN NS e.gtld-servers.net.
    SECTION ADDITIONAL
    e.gtld-servers.net. IN A 192.12.94.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    example.net. IN NS
    SECTION AUTHORITY
    example.net. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.net. IN A 1.2.3.44
    ENTRY_END
    RANGE_END
    ; ns.example.net.
    ; The parent-IP version
    RANGE_BEGIN 0 100
    ADDRESS 1.2.3.44
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    example.net. IN NS
    SECTION ANSWER
    example.net. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.net. IN A 1.2.3.55
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    ns.example.net. IN A
    SECTION ANSWER
    ns.example.net. IN A 1.2.3.55
    SECTION AUTHORITY
    example.net. IN NS ns.example.net.
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    ns.example.net. IN AAAA
    SECTION AUTHORITY
    example.net. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.net. IN A 1.2.3.55
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    example.com. IN NS
    SECTION ANSWER
    example.com. IN NS ns.example.net.
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    www.example.com. IN A
    SECTION ANSWER
    www.example.com. IN A 10.20.30.40
    SECTION AUTHORITY
    example.com. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.net IN A 1.2.3.55
    ENTRY_END
    RANGE_END
    ; ns.example.net
    ; The child IP version. Does not respond to anything (servfail instead
    ; of timeouts since this is easier to encode in .rpl file format).
    RANGE_BEGIN 0 100
    ADDRESS 1.2.3.55
    ENTRY_BEGIN
    MATCH opcode
    ADJUST copy_id copy_query
    REPLY QR SERVFAIL
    SECTION QUESTION
    example.net. IN NS
    SECTION ANSWER
    ENTRY_END
    RANGE_END
    STEP 1 QUERY
    ENTRY_BEGIN
    REPLY RD
    SECTION QUESTION
    www.example.com. IN A
    ENTRY_END
    ; recursion happens here.
    STEP 20 CHECK_ANSWER
    ENTRY_BEGIN
    MATCH opcode qname flags rcode question answer
    REPLY QR RD RA NOERROR
    SECTION QUESTION
    www.example.com. IN A
    SECTION ANSWER
    www.example.com. IN A 10.20.30.40
    SECTION AUTHORITY
    example.com. IN NS ns.example.net.
    ; scrubbed off
    ;SECTION ADDITIONAL
    ;ns.example.net IN A 1.2.3.44
    ENTRY_END
    SCENARIO_END
    sets/resolver/iter_pcnamerec.rpl 0 → 100644
    View file @ 41f626e4
    ; config options
    ;server:
    ; target-fetch-policy: "0 0 0 0 0"
    ;stub-zone:
    ; name: "."
    stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
    CONFIG_END
    SCENARIO_BEGIN Test resolution with parent child differ names recursive.
    ; the parent has an extra name that is the only working one.
    ; and that name needs its parent-side glue to work.
    ; K.ROOT-SERVERS.NET.
    RANGE_BEGIN 0 100
    ADDRESS 193.0.14.129
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR 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
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    com. IN NS
    SECTION AUTHORITY
    com. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    net. IN NS
    SECTION AUTHORITY
    net. IN NS e.gtld-servers.net.
    SECTION ADDITIONAL
    e.gtld-servers.net. IN A 192.12.94.30
    ENTRY_END
    RANGE_END
    ; a.gtld-servers.net.
    RANGE_BEGIN 0 100
    ADDRESS 192.5.6.30
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR NOERROR
    SECTION QUESTION
    com. IN NS
    SECTION ANSWER
    com. IN NS a.gtld-servers.net.
    SECTION ADDITIONAL
    a.gtld-servers.net. IN A 192.5.6.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    example.com. IN NS
    SECTION AUTHORITY
    example.com. IN NS ns.example.com.
    example.com. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.com. IN A 1.2.3.55
    ENTRY_END
    RANGE_END
    ; e.gtld-servers.net.
    RANGE_BEGIN 0 100
    ADDRESS 192.12.94.30
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY QR NOERROR
    SECTION QUESTION
    net. IN NS
    SECTION ANSWER
    net. IN NS e.gtld-servers.net.
    SECTION ADDITIONAL
    e.gtld-servers.net. IN A 192.12.94.30
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode subdomain
    ADJUST copy_id copy_query
    REPLY QR NOERROR
    SECTION QUESTION
    example.net. IN NS
    SECTION AUTHORITY
    example.net. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.net. IN A 1.2.3.44
    ENTRY_END
    RANGE_END
    ; ns.example.net.
    ; the working version.
    RANGE_BEGIN 0 100
    ADDRESS 1.2.3.44
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    example.net. IN NS
    SECTION ANSWER
    example.net. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.net. IN A 1.2.3.55
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    ns.example.net. IN A
    SECTION ANSWER
    ns.example.net. IN A 1.2.3.55
    SECTION AUTHORITY
    example.net. IN NS ns.example.net.
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    ns.example.net. IN AAAA
    SECTION AUTHORITY
    example.net. IN NS ns.example.net.
    SECTION ADDITIONAL
    ns.example.net. IN A 1.2.3.55
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    ns.example.com. IN A
    SECTION ANSWER
    ns.example.com. IN A 1.2.3.55
    SECTION AUTHORITY
    example.com. IN NS ns.example.com.
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    ns.example.com. IN AAAA
    SECTION AUTHORITY
    example.com. IN NS ns.example.com.
    SECTION ADDITIONAL
    ns.example.com. IN A 1.2.3.55
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    example.com. IN NS
    SECTION ANSWER
    example.com. IN NS ns.example.com.
    SECTION ADDITIONAL
    ns.example.com. IN A 1.2.3.55
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    www.example.com. IN A
    SECTION ANSWER
    www.example.com. IN A 10.20.30.40
    SECTION AUTHORITY
    example.com. IN NS ns.example.com.
    SECTION ADDITIONAL
    ns.example.com. IN A 1.2.3.55
    ENTRY_END
    ENTRY_BEGIN
    MATCH opcode qtype qname
    ADJUST copy_id
    REPLY AA QR NOERROR
    SECTION QUESTION
    mail.example.com. IN A
    SECTION ANSWER
    mail.example.com. IN A 10.20.30.20
    SECTION AUTHORITY
    example.com. IN NS ns.example.com.
    SECTION ADDITIONAL
    ns.example.com. IN A 1.2.3.55
    ENTRY_END
    RANGE_END
    ; ns.example.net
    ; Broken. Does not respond to anything (servfail instead
    ; of timeouts since this is easier to encode in .rpl file format).
    RANGE_BEGIN 0 100
    ADDRESS 1.2.3.55
    ENTRY_BEGIN
    MATCH opcode
    ADJUST copy_id copy_query
    REPLY QR SERVFAIL
    SECTION QUESTION
    example.net. IN NS
    SECTION ANSWER
    ENTRY_END
    RANGE_END
    STEP 1 QUERY
    ENTRY_BEGIN
    REPLY RD
    SECTION QUESTION
    www.example.com. IN A
    ENTRY_END
    ; recursion happens here.
    STEP 20 CHECK_ANSWER
    ENTRY_BEGIN
    MATCH opcode qname flags rcode question answer
    REPLY QR RD RA NOERROR
    SECTION QUESTION
    www.example.com. IN A
    SECTION ANSWER
    www.example.com. IN A 10.20.30.40
    SECTION AUTHORITY
    example.com. IN NS ns.example.com.
    SECTION ADDITIONAL
    ns.example.com. IN A 1.2.3.55
    ENTRY_END
    ; now that the bad child NS record is in cache, ask something else.
    STEP 30 QUERY
    ENTRY_BEGIN
    REPLY RD
    SECTION QUESTION
    mail.example.com. IN A
    ENTRY_END
    STEP 40 CHECK_ANSWER
    ENTRY_BEGIN
    MATCH opcode qname flags rcode question answer
    REPLY QR RD RA NOERROR
    SECTION QUESTION
    mail.example.com. IN A
    SECTION ANSWER
    mail.example.com. IN A 10.20.30.20
    SECTION AUTHORITY