Fixup stub chain of trust from public to private servers.

git-svn-id: file:///svn/unbound/trunk@1648 be551aaa-1e26-0410-a405-d3ace91eadb9

diff --git a/doc/Changelog b/doc/Changelog
index 4ce11741bac4e7ced7a01e636e0ed619693f9fb0..b8fbb207767af5a17dcffe844a4d6716b0fd2324 100644 (file)
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,11 @@
+11 June 2009: Wouter
+       - Fix queries for type DS when forward or stub zones are there.
+         They are performed to higherup domains, and thus treated as if
+         going to higher zones when looking up the right forward or stub
+         server.  This makes a stub pointing to a local server that has
+         a local view of example.com signed with the same keys as are
+         publicly used work.  Reported by Johan Ihren.
+
 9 June 2009: Wouter
        - openssl key files are opened apache-style, when user is root and
          before chrooting.  This makes permissions on remote-control key 

diff --git a/iterator/iterator.c b/iterator/iterator.c
index 72d5198ebef7e6e8bbc03d81528c1c3f72e1d8e3..74be2381c17e18e6bb7b7858b52b508b6c38559b 100644 (file)
--- a/iterator/iterator.c
+++ b/iterator/iterator.c
@@ -592,21 +592,27 @@ prime_root(struct module_qstate* qstate, struct iter_qstate* iq,
  * @param iq: iterator query state.
  * @param ie: iterator global state.
  * @param id: module id.
- * @param qname: request name.
- * @param qclass: the class to prime.
+ * @param q: request name.
  * @return true if a priming subrequest was made, false if not. The will only
  *         issue a priming request if it detects an unprimed stub.
  */
 static int
 prime_stub(struct module_qstate* qstate, struct iter_qstate* iq, 
-       struct iter_env* ie, int id, uint8_t* qname, uint16_t qclass)
+       struct iter_env* ie, int id, struct query_info* q)
 {
        /* Lookup the stub hint. This will return null if the stub doesn't 
         * need to be re-primed. */
-       struct iter_hints_stub* stub = hints_lookup_stub(ie->hints, 
-               qname, qclass, iq->dp);
+       struct iter_hints_stub* stub;
        struct delegpt* stub_dp;
        struct module_qstate* subq;
+       uint8_t* delname = q->qname;
+       size_t delnamelen = q->qname_len;
+
+       if(q->qtype == LDNS_RR_TYPE_DS && !dname_is_root(q->qname))
+               /* remove first label, but not for root */
+               dname_remove_label(&delname, &delnamelen);
+
+       stub = hints_lookup_stub(ie->hints, delname, q->qclass, iq->dp);
        /* The stub (if there is one) does not need priming. */
        if(!stub)
                return 0;
@@ -623,18 +629,18 @@ prime_stub(struct module_qstate* qstate, struct iter_qstate* iq,
                        return 1; /* return 1 to make module stop, with error */
                }
                log_nametypeclass(VERB_DETAIL, "use stub", stub_dp->name, 
-                       LDNS_RR_TYPE_NS, qclass);
+                       LDNS_RR_TYPE_NS, q->qclass);
                return 0;
        }
 
        /* Otherwise, we need to (re)prime the stub. */
        log_nametypeclass(VERB_DETAIL, "priming stub", stub_dp->name, 
-               LDNS_RR_TYPE_NS, qclass);
+               LDNS_RR_TYPE_NS, q->qclass);
 
        /* Stub priming events start at the QUERYTARGETS state to avoid the
         * redundant INIT state processing. */
        if(!generate_sub_request(stub_dp->name, stub_dp->namelen, 
-               LDNS_RR_TYPE_NS, qclass, qstate, id, iq,
+               LDNS_RR_TYPE_NS, q->qclass, qstate, id, iq,
                QUERYTARGETS_STATE, PRIME_RESP_STATE, &subq, 0)) {
                verbose(VERB_ALGO, "could not prime stub");
                (void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
@@ -781,8 +787,14 @@ generate_ns_check(struct module_qstate* qstate, struct iter_qstate* iq, int id)
 static int
 forward_request(struct module_qstate* qstate, struct iter_qstate* iq)
 {
-       struct delegpt* dp = forwards_lookup(qstate->env->fwds, 
-               iq->qchase.qname, iq->qchase.qclass);
+       struct delegpt* dp;
+       uint8_t* delname = iq->qchase.qname;
+       size_t delnamelen = iq->qchase.qname_len;
+       /* strip one label off of DS query to lookup higher for it */
+       if(iq->qchase.qtype == LDNS_RR_TYPE_DS 
+               && !dname_is_root(iq->qchase.qname))
+               dname_remove_label(&delname, &delnamelen);
+       dp = forwards_lookup(qstate->env->fwds, delname, iq->qchase.qclass);
        if(!dp) 
                return 0;
        /* send recursion desired to forward addr */
@@ -1030,8 +1042,7 @@ processInitRequest2(struct module_qstate* qstate, struct iter_qstate* iq,
                &qstate->qinfo);
 
        /* Check to see if we need to prime a stub zone. */
-       if(prime_stub(qstate, iq, ie, id, iq->qchase.qname, 
-               iq->qchase.qclass)) {
+       if(prime_stub(qstate, iq, ie, id, &iq->qchase)) {
                /* A priming sub request was made */
                return 0;
        }

diff --git a/testdata/val_stubds.rpl b/testdata/val_stubds.rpl
new file mode 100644 (file)
index 0000000..a79c5b6
--- /dev/null
+++ b/testdata/val_stubds.rpl
@@ -0,0 +1,456 @@
+; config options
+; The island of trust is at example.com
+server:
+       trust-anchor: "example.com.    3600    IN      DS      2854 3 1 46e4ffc6e9a4793b488954bd3f0cc6af0dfb201b"
+       val-override-date: "20070916134226"
+       target-fetch-policy: "0 0 0 0 0"
+
+stub-zone:
+       name: "."
+       stub-addr: 193.0.14.129         # K.ROOT-SERVERS.NET.
+stub-zone:
+       name: "sub.example.com"
+       stub-addr: 1.2.3.6
+CONFIG_END
+
+SCENARIO_BEGIN Test stub with DS query
+; The stub zone is linked validly with a DS to the public internet zone.
+; unbound just has to be able to ask the DS from the right server (not 
+; from the stub).
+
+; 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
+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 A
+SECTION AUTHORITY
+example.com.   IN NS   ns.example.com.
+SECTION ADDITIONAL
+ns.example.com.                IN      A       1.2.3.4
+ENTRY_END
+RANGE_END
+
+; ns.example.com.
+RANGE_BEGIN 0 100
+       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.
+example.com.    3600    IN      RRSIG   NS 3 2 3600 20070926134150 20070829134150 2854 example.com. MC0CFQCN+qHdJxoI/2tNKwsb08pra/G7aAIUAWA5sDdJTbrXA1/3OaesGBAO3sI= ;{id = 2854}
+SECTION ADDITIONAL
+ns.example.com.         IN      A       1.2.3.4
+ns.example.com. 3600    IN      RRSIG   A 3 3 3600 20070926135752 20070829135752 2854 example.com. MC0CFQCMSWxVehgOQLoYclB9PIAbNP229AIUeH0vNNGJhjnZiqgIOKvs1EhzqAo= ;{id = 2854}
+ENTRY_END
+
+; response to DNSKEY priming query
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+example.com. IN DNSKEY
+SECTION ANSWER
+example.com.    3600    IN      DNSKEY  256 3 3 ALXLUsWqUrY3JYER3T4TBJII s70j+sDS/UT2QRp61SE7S3E EXopNXoFE73JLRmvpi/UrOO/Vz4Se 6wXv/CYCKjGw06U4WRgR YXcpEhJROyNapmdIKSx hOzfLVE1gqA0PweZR8d tY3aNQSRn3sPpwJr6Mi /PqQKAMMrZ9ckJpf1+b QMOOvxgzz2U1GS18b3y ZKcgTMEaJzd/GZYzi/B N2DzQ0MsrSwYXfsNLFO Bbs8PJMW4LYIxeeOe6rUgkWOF 7CC9Dh/dduQ1QrsJhmZAEFfd6ByYV+ ;{id = 2854 (zsk), size = 1688b}
+example.com. 3600    IN      RRSIG   DNSKEY DSA 2 3600 20070926134150 20070829134150 2854 example.com. MCwCFBQRtlR4BEv9ohi+PGFjp+AHsJuHAhRCvz0shggvnvI88DFnBDCczHUcVA== ;{id = 2854}
+SECTION AUTHORITY
+example.com.   IN NS   ns.example.com.
+example.com.    3600    IN      RRSIG   NS 3 2 3600 20070926134150 20070829134150 2854 example.com. MC0CFQCN+qHdJxoI/2tNKwsb08pra/G7aAIUAWA5sDdJTbrXA1/3OaesGBAO3sI= ;{id = 2854}
+SECTION ADDITIONAL
+ns.example.com.                IN      A       1.2.3.4
+ns.example.com. 3600    IN      RRSIG   A 3 3 3600 20070926135752 20070829135752 2854 example.com. MC0CFQCMSWxVehgOQLoYclB9PIAbNP229AIUeH0vNNGJhjnZiqgIOKvs1EhzqAo= ;{id = 2854}
+ENTRY_END
+
+; response for DS of sub.example.com.
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN DS
+SECTION ANSWER
+sub.example.com.        3600    IN      DS      30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
+sub.example.com.        3600    IN      RRSIG   DS 3 3 3600 20070926134150 20070829134150 2854 example.com. MCwCFCW3ix0GD4BSvNLWIbROCJt5DAW9AhRt/kg9kBKJ20UBUdumrBUHqnskdA== ;{id = 2854}
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+
+; response for delegation to sub.example.com.
+ENTRY_BEGIN
+MATCH opcode subdomain
+ADJUST copy_id copy_query
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN A
+SECTION ANSWER
+SECTION AUTHORITY
+sub.example.com. IN    NS ns.sub.example.com.
+sub.example.com.        3600    IN      DS      30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
+sub.example.com.        3600    IN      RRSIG   DS 3 3 3600 20070926134150 20070829134150 2854 example.com. MCwCFCW3ix0GD4BSvNLWIbROCJt5DAW9AhRt/kg9kBKJ20UBUdumrBUHqnskdA== ;{id = 2854}
+SECTION ADDITIONAL
+ns.sub.example.com. IN A 1.2.3.6
+ENTRY_END
+
+RANGE_END
+
+; ns.sub.example.com.
+RANGE_BEGIN 0 100
+       ADDRESS 1.2.3.6
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN NS
+SECTION ANSWER
+sub.example.com. IN    NS ns.sub.example.com.
+sub.example.com.        3600    IN      RRSIG   NS 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. wcpHeBILHfo8C9uxMhcW03gcURZeUffiKdSTb50ZjzTHgMNhRyMfpcvSpXEd9548A9UTmWKeLZChfr5Z/glONw== ;{id = 30899}
+SECTION ADDITIONAL
+ns.sub.example.com. IN A 1.2.3.6
+ns.sub.example.com.     3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. UF7shD/gt1FOp2UHgLTNbPzVykklSXFMEtJ1xD+Hholwf/PIzd7zoaIttIYibNa4fUXCqMg22H9P7MRhfmFe6g== ;{id = 30899}
+ENTRY_END
+
+; response to DNSKEY priming query
+; sub.example.com.        3600    IN      DS      30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN DNSKEY
+SECTION ANSWER
+sub.example.com.        3600    IN      DNSKEY  256 3 5 AQPQ41chR9DEHt/aIzIFAqanbDlRflJoRs5yz1jFsoRIT7dWf0r+PeDuewdxkszNH6wnU4QL8pfKFRh5PIYVBLK3 ;{id = 30899 (zsk), size = 512b}
+sub.example.com.        3600    IN      RRSIG   DNSKEY 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. uNGp99iznjD7oOX02XnQbDnbg75UwBHRvZSKYUorTKvPUnCWMHKdRsQ+mf+Fx3GZ+Fz9BVjoCmQqpnfgXLEYqw== ;{id = 30899}
+SECTION AUTHORITY
+sub.example.com. IN    NS ns.sub.example.com.
+sub.example.com.        3600    IN      RRSIG   NS 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. wcpHeBILHfo8C9uxMhcW03gcURZeUffiKdSTb50ZjzTHgMNhRyMfpcvSpXEd9548A9UTmWKeLZChfr5Z/glONw== ;{id = 30899}
+SECTION ADDITIONAL
+ns.sub.example.com. IN A 1.2.3.6
+ns.sub.example.com.     3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. UF7shD/gt1FOp2UHgLTNbPzVykklSXFMEtJ1xD+Hholwf/PIzd7zoaIttIYibNa4fUXCqMg22H9P7MRhfmFe6g== ;{id = 30899}
+ENTRY_END
+
+; response for qtype DS.  This is not available here.
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR SERVFAIL
+SECTION QUESTION
+sub.example.com. IN DS
+SECTION ANSWER
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+
+; response to query of interest
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+www.sub.example.com. IN A
+SECTION ANSWER
+www.sub.example.com. IN A      11.11.11.11
+www.sub.example.com.    3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. 0DqqRfRtm7VSEQ4mmBbzrKRqQAay3JAE8DPDGmjtokrrjN9F1G/HxozDV7bjdIh2EChlQea8FPwf/GepJMUVxg== ;{id = 30899}
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+RANGE_END
+
+STEP 1 QUERY
+ENTRY_BEGIN
+REPLY RD DO
+SECTION QUESTION
+www.sub.example.com. IN A
+ENTRY_END
+
+; recursion happens here.
+STEP 10 CHECK_ANSWER
+ENTRY_BEGIN
+MATCH all
+REPLY QR RD RA AD NOERROR
+SECTION QUESTION
+www.sub.example.com. IN A
+SECTION ANSWER
+www.sub.example.com.   3600    IN      A       11.11.11.11
+www.sub.example.com.    3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. 0DqqRfRtm7VSEQ4mmBbzrKRqQAay3JAE8DPDGmjtokrrjN9F1G/HxozDV7bjdIh2EChlQea8FPwf/GepJMUVxg== ;{id = 30899}
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+
+SCENARIO_END
+; config options
+; The island of trust is at example.com
+server:
+       trust-anchor: "example.com.    3600    IN      DS      2854 3 1 46e4ffc6e9a4793b488954bd3f0cc6af0dfb201b"
+       val-override-date: "20070916134226"
+       target-fetch-policy: "0 0 0 0 0"
+
+stub-zone:
+       name: "."
+       stub-addr: 193.0.14.129         # K.ROOT-SERVERS.NET.
+stub-zone:
+       name: "sub.example.com"
+       stub-addr: 1.2.3.6
+CONFIG_END
+
+SCENARIO_BEGIN Test stub with DS query
+; The stub zone is linked validly with a DS to the public internet zone.
+; unbound just has to be able to ask the DS from the right server (not 
+; from the stub).
+
+; 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
+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 A
+SECTION AUTHORITY
+example.com.   IN NS   ns.example.com.
+SECTION ADDITIONAL
+ns.example.com.                IN      A       1.2.3.4
+ENTRY_END
+RANGE_END
+
+; ns.example.com.
+RANGE_BEGIN 0 100
+       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.
+example.com.    3600    IN      RRSIG   NS 3 2 3600 20070926134150 20070829134150 2854 example.com. MC0CFQCN+qHdJxoI/2tNKwsb08pra/G7aAIUAWA5sDdJTbrXA1/3OaesGBAO3sI= ;{id = 2854}
+SECTION ADDITIONAL
+ns.example.com.         IN      A       1.2.3.4
+ns.example.com. 3600    IN      RRSIG   A 3 3 3600 20070926135752 20070829135752 2854 example.com. MC0CFQCMSWxVehgOQLoYclB9PIAbNP229AIUeH0vNNGJhjnZiqgIOKvs1EhzqAo= ;{id = 2854}
+ENTRY_END
+
+; response to DNSKEY priming query
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+example.com. IN DNSKEY
+SECTION ANSWER
+example.com.    3600    IN      DNSKEY  256 3 3 ALXLUsWqUrY3JYER3T4TBJII s70j+sDS/UT2QRp61SE7S3E EXopNXoFE73JLRmvpi/UrOO/Vz4Se 6wXv/CYCKjGw06U4WRgR YXcpEhJROyNapmdIKSx hOzfLVE1gqA0PweZR8d tY3aNQSRn3sPpwJr6Mi /PqQKAMMrZ9ckJpf1+b QMOOvxgzz2U1GS18b3y ZKcgTMEaJzd/GZYzi/B N2DzQ0MsrSwYXfsNLFO Bbs8PJMW4LYIxeeOe6rUgkWOF 7CC9Dh/dduQ1QrsJhmZAEFfd6ByYV+ ;{id = 2854 (zsk), size = 1688b}
+example.com. 3600    IN      RRSIG   DNSKEY DSA 2 3600 20070926134150 20070829134150 2854 example.com. MCwCFBQRtlR4BEv9ohi+PGFjp+AHsJuHAhRCvz0shggvnvI88DFnBDCczHUcVA== ;{id = 2854}
+SECTION AUTHORITY
+example.com.   IN NS   ns.example.com.
+example.com.    3600    IN      RRSIG   NS 3 2 3600 20070926134150 20070829134150 2854 example.com. MC0CFQCN+qHdJxoI/2tNKwsb08pra/G7aAIUAWA5sDdJTbrXA1/3OaesGBAO3sI= ;{id = 2854}
+SECTION ADDITIONAL
+ns.example.com.                IN      A       1.2.3.4
+ns.example.com. 3600    IN      RRSIG   A 3 3 3600 20070926135752 20070829135752 2854 example.com. MC0CFQCMSWxVehgOQLoYclB9PIAbNP229AIUeH0vNNGJhjnZiqgIOKvs1EhzqAo= ;{id = 2854}
+ENTRY_END
+
+; response for DS of sub.example.com.
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN DS
+SECTION ANSWER
+sub.example.com.        3600    IN      DS      30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
+sub.example.com.        3600    IN      RRSIG   DS 3 3 3600 20070926134150 20070829134150 2854 example.com. MCwCFCW3ix0GD4BSvNLWIbROCJt5DAW9AhRt/kg9kBKJ20UBUdumrBUHqnskdA== ;{id = 2854}
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+
+; response for delegation to sub.example.com.
+ENTRY_BEGIN
+MATCH opcode subdomain
+ADJUST copy_id copy_query
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN A
+SECTION ANSWER
+SECTION AUTHORITY
+sub.example.com. IN    NS ns.sub.example.com.
+sub.example.com.        3600    IN      DS      30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
+sub.example.com.        3600    IN      RRSIG   DS 3 3 3600 20070926134150 20070829134150 2854 example.com. MCwCFCW3ix0GD4BSvNLWIbROCJt5DAW9AhRt/kg9kBKJ20UBUdumrBUHqnskdA== ;{id = 2854}
+SECTION ADDITIONAL
+ns.sub.example.com. IN A 1.2.3.6
+ENTRY_END
+
+RANGE_END
+
+; ns.sub.example.com.
+RANGE_BEGIN 0 100
+       ADDRESS 1.2.3.6
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN NS
+SECTION ANSWER
+sub.example.com. IN    NS ns.sub.example.com.
+sub.example.com.        3600    IN      RRSIG   NS 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. wcpHeBILHfo8C9uxMhcW03gcURZeUffiKdSTb50ZjzTHgMNhRyMfpcvSpXEd9548A9UTmWKeLZChfr5Z/glONw== ;{id = 30899}
+SECTION ADDITIONAL
+ns.sub.example.com. IN A 1.2.3.6
+ns.sub.example.com.     3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. UF7shD/gt1FOp2UHgLTNbPzVykklSXFMEtJ1xD+Hholwf/PIzd7zoaIttIYibNa4fUXCqMg22H9P7MRhfmFe6g== ;{id = 30899}
+ENTRY_END
+
+; response to DNSKEY priming query
+; sub.example.com.        3600    IN      DS      30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+sub.example.com. IN DNSKEY
+SECTION ANSWER
+sub.example.com.        3600    IN      DNSKEY  256 3 5 AQPQ41chR9DEHt/aIzIFAqanbDlRflJoRs5yz1jFsoRIT7dWf0r+PeDuewdxkszNH6wnU4QL8pfKFRh5PIYVBLK3 ;{id = 30899 (zsk), size = 512b}
+sub.example.com.        3600    IN      RRSIG   DNSKEY 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. uNGp99iznjD7oOX02XnQbDnbg75UwBHRvZSKYUorTKvPUnCWMHKdRsQ+mf+Fx3GZ+Fz9BVjoCmQqpnfgXLEYqw== ;{id = 30899}
+SECTION AUTHORITY
+sub.example.com. IN    NS ns.sub.example.com.
+sub.example.com.        3600    IN      RRSIG   NS 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. wcpHeBILHfo8C9uxMhcW03gcURZeUffiKdSTb50ZjzTHgMNhRyMfpcvSpXEd9548A9UTmWKeLZChfr5Z/glONw== ;{id = 30899}
+SECTION ADDITIONAL
+ns.sub.example.com. IN A 1.2.3.6
+ns.sub.example.com.     3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. UF7shD/gt1FOp2UHgLTNbPzVykklSXFMEtJ1xD+Hholwf/PIzd7zoaIttIYibNa4fUXCqMg22H9P7MRhfmFe6g== ;{id = 30899}
+ENTRY_END
+
+; response for qtype DS.  This is not available here.
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR SERVFAIL
+SECTION QUESTION
+sub.example.com. IN DS
+SECTION ANSWER
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+
+; response to query of interest
+ENTRY_BEGIN
+MATCH opcode qtype qname
+ADJUST copy_id
+REPLY QR NOERROR
+SECTION QUESTION
+www.sub.example.com. IN A
+SECTION ANSWER
+www.sub.example.com. IN A      11.11.11.11
+www.sub.example.com.    3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. 0DqqRfRtm7VSEQ4mmBbzrKRqQAay3JAE8DPDGmjtokrrjN9F1G/HxozDV7bjdIh2EChlQea8FPwf/GepJMUVxg== ;{id = 30899}
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+RANGE_END
+
+STEP 1 QUERY
+ENTRY_BEGIN
+REPLY RD DO
+SECTION QUESTION
+www.sub.example.com. IN A
+ENTRY_END
+
+; recursion happens here.
+STEP 10 CHECK_ANSWER
+ENTRY_BEGIN
+MATCH all
+REPLY QR RD RA AD NOERROR
+SECTION QUESTION
+www.sub.example.com. IN A
+SECTION ANSWER
+www.sub.example.com.   3600    IN      A       11.11.11.11
+www.sub.example.com.    3600    IN      RRSIG   A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. 0DqqRfRtm7VSEQ4mmBbzrKRqQAay3JAE8DPDGmjtokrrjN9F1G/HxozDV7bjdIh2EChlQea8FPwf/GepJMUVxg== ;{id = 30899}
+SECTION AUTHORITY
+SECTION ADDITIONAL
+ENTRY_END
+
+SCENARIO_END