Merge branch 'master' of ssh://bind10.isc.org/var/bind10/git/bind10

src/lib/nsas/nameserver_address_store.h

@@ -38,7 +38,6 @@ template<class T> class LruList;
 
 namespace nsas {
 
-class ResolverInterface;
 template<class T> class HashTable;
 class ZoneEntry;
 class NameserverEntry;

src/lib/nsas/tests/nameserver_address_unittest.cc

@@ -51,7 +51,8 @@ public:
         ns_.reset(new NameserverEntry(name_.toText(), RRClass::IN()));
         ns_->askIP(resolver_.get(), boost::shared_ptr<Callback>(new Callback), ANY_OK);
         resolver_->asksIPs(name_, 0, 1);
-        resolver_->requests[0].second->success(createResponseMessage(rrv4_));
+        resolver_->requests[0].second->success(
+            isc::util::unittests::createResponseMessage(rrv4_));
     }
 
     // Return the sample NameserverEntry

src/lib/nsas/tests/nameserver_entry_unittest.cc

@@ -72,7 +72,8 @@ private:
         RRsetPtr set)
     {
         if (set) {
-            resolver->requests[index].second->success(createResponseMessage(set));
+            resolver->requests[index].second->success(
+                isc::util::unittests::createResponseMessage(set));
         } else {
             resolver->requests[index].second->failure();
         }

src/lib/nsas/tests/nsas_test.h

@@ -27,6 +27,7 @@
 #include <config.h>
 
 #include <util/buffer.h>
+#include <util/unittests/resolver.h>
 #include <dns/message.h>
 #include <dns/rdata.h>
 #include <dns/rrtype.h>
@@ -35,24 +36,12 @@
 #include <dns/rcode.h>
 #include <dns/messagerenderer.h>
 #include <dns/rdataclass.h>
-#include <resolve/resolver_interface.h>
 #include "../nsas_entry.h"
 
 using namespace isc::dns::rdata;
 using namespace isc::dns;
 using namespace isc::util;
-
-namespace {
-    MessagePtr
-    createResponseMessage(RRsetPtr answer_rrset)
-    {
-        MessagePtr response(new Message(Message::RENDER));
-        response->setOpcode(Opcode::QUERY());
-        response->setRcode(Rcode::NOERROR());
-        response->addRRset(Message::SECTION_ANSWER, answer_rrset);
-        return response;
-    }
-}
+using isc::util::unittests::TestResolver;
 
 namespace isc {
 namespace dns {
@@ -223,139 +212,6 @@ private:
 
 static const uint32_t HASHTABLE_DEFAULT_SIZE = 1009; ///< First prime above 1000
 
-using namespace std;
-
-/*
- * This pretends to be a resolver. It stores the queries and
- * they can be answered.
- */
-class TestResolver : public isc::resolve::ResolverInterface {
-    private:
-        bool checkIndex(size_t index) {
-            return (requests.size() > index);
-        }
-
-        typedef std::map<isc::dns::Question, RRsetPtr >
-            PresetAnswers;
-        PresetAnswers answers_;
-    public:
-        typedef pair<QuestionPtr, CallbackPtr> Request;
-        vector<Request> requests;
-
-        /// \brief Destructor
-        ///
-        /// This is important.  All callbacks in the requests vector must be
-        /// called to remove them from internal loops.  Without this, destroying
-        /// the NSAS object will leave memory assigned.
-        ~TestResolver() {
-            for (size_t i = 0; i < requests.size(); ++i) {
-                requests[i].second->failure();
-            }
-        }
-
-        virtual void resolve(const QuestionPtr& q, const CallbackPtr& c) {
-            PresetAnswers::iterator it(answers_.find(*q));
-            if (it == answers_.end()) {
-                requests.push_back(Request(q, c));
-            } else {
-                if (it->second) {
-                    c->success(createResponseMessage(it->second));
-                } else {
-                    c->failure();
-                }
-            }
-        }
-
-        /*
-         * Add a preset answer. If shared_ptr() is passed (eg. NULL),
-         * it will generate failure. If the question is not preset,
-         * it goes to requests and you can answer later.
-         */
-        void addPresetAnswer(const isc::dns::Question& question,
-            RRsetPtr answer)
-        {
-            answers_[question] = answer;
-        }
-
-        // Thrown if the query at the given index does not exist.
-        class NoSuchRequest : public std::exception { };
-
-        // Thrown if the answer does not match the query
-        class DifferentRequest : public std::exception { };
-
-        QuestionPtr operator[](size_t index) {
-            if (index >= requests.size()) {
-                throw NoSuchRequest();
-            }
-            return (requests[index].first);
-        }
-        /*
-         * Looks if the two provided requests in resolver are A and AAAA.
-         * Sorts them so index1 is A.
-         *
-         * Returns false if there aren't enough elements
-         */
-        bool asksIPs(const Name& name, size_t index1, size_t index2) {
-            size_t max = (index1 < index2) ? index2 : index1;
-            if (!checkIndex(max)) {
-                return false;
-            }
-            EXPECT_EQ(name, (*this)[index1]->getName());
-            EXPECT_EQ(name, (*this)[index2]->getName());
-            EXPECT_EQ(RRClass::IN(), (*this)[index1]->getClass());
-            EXPECT_EQ(RRClass::IN(), (*this)[index2]->getClass());
-            // If they are the other way around, swap
-            if ((*this)[index1]->getType() == RRType::AAAA() &&
-                (*this)[index2]->getType() == RRType::A())
-            {
-                TestResolver::Request tmp((*this).requests[index1]);
-                (*this).requests[index1] =
-                    (*this).requests[index2];
-                (*this).requests[index2] = tmp;
-            }
-            // Check the correct addresses
-            EXPECT_EQ(RRType::A(), (*this)[index1]->getType());
-            EXPECT_EQ(RRType::AAAA(), (*this)[index2]->getType());
-            return (true);
-        }
-
-        /*
-         * Sends a simple answer to a query.
-         * 1) Provide index of a query and the address(es) to pass.
-         * 2) Provide index of query and components of address to pass.
-         */
-        void answer(size_t index, RRsetPtr& set) {
-            if (index >= requests.size()) {
-                throw NoSuchRequest();
-            }
-            requests[index].second->success(createResponseMessage(set));
-        }
-
-        void answer(size_t index, const Name& name, const RRType& type,
-            const rdata::Rdata& rdata, size_t TTL = 100)
-        {
-            RRsetPtr set(new RRset(name, RRClass::IN(),
-                type, RRTTL(TTL)));
-            set->addRdata(rdata);
-            answer(index, set);
-        }
-
-
-        void provideNS(size_t index,
-            RRsetPtr nameservers)
-        {
-            if (index >= requests.size()) {
-                throw NoSuchRequest();
-            }
-            if (requests[index].first->getName() != nameservers->getName() ||
-                requests[index].first->getType() != RRType::NS())
-            {
-                throw DifferentRequest();
-            }
-            requests[index].second->success(createResponseMessage(nameservers));
-        }
-};
-
 // String constants.  These should end in a dot.
 static const std::string EXAMPLE_CO_UK("example.co.uk.");
 static const std::string EXAMPLE_NET("example.net.");

src/lib/resolve/recursive_query.cc

@@ -28,6 +28,7 @@
 #include <dns/message.h>
 #include <dns/opcode.h>
 #include <dns/exceptions.h>
+#include <dns/rdataclass.h>
 
 #include <resolve/resolve.h>
 #include <cache/resolver_cache.h>
@@ -48,6 +49,65 @@ using namespace isc::asiolink;
 namespace isc {
 namespace asiodns {
 
+namespace {
+// Function to check if the given name/class has any address in the cache
+bool
+hasAddress(const Name& name, const RRClass& rrClass,
+      const isc::cache::ResolverCache& cache)
+{
+    // FIXME: If we are single-stack and we get only the other type of
+    // address, what should we do? In that case, it will be considered
+    // unreachable, which is most probably true, because A and AAAA will
+    // usually have the same RTT, so we should have both or none from the
+    // glue.
+    return (cache.lookup(name, RRType::A(), rrClass) != RRsetPtr() ||
+            cache.lookup(name, RRType::AAAA(), rrClass) != RRsetPtr());
+}
+
+}
+
+/// \brief Find deepest usable delegation in the cache
+///
+/// This finds the deepest delegation we have in cache and is safe to use.
+/// It is not public function, therefore it's not in header. But it's not
+/// in anonymous namespace, so we can call it from unittests.
+/// \param name The name we want to delegate to.
+/// \param cache The place too look for known delegations.
+std::string
+deepestDelegation(Name name, RRClass rrclass,
+                  isc::cache::ResolverCache& cache)
+{
+    RRsetPtr cachedNS;
+    // Look for delegation point from bottom, until we find one with
+    // IP address or get to root.
+    //
+    // We need delegation with IP address so we can ask it right away.
+    // If we don't have the IP address, we would need to ask above it
+    // anyway in the best case, and the NS could be inside the zone,
+    // and we could get all loopy with the NSAS in the worst case.
+    while (name.getLabelCount() > 1 &&
+           (cachedNS = cache.lookupDeepestNS(name, rrclass)) != RRsetPtr()) {
+        // Look if we have an IP address for the NS
+        for (RdataIteratorPtr ns(cachedNS->getRdataIterator());
+             !ns->isLast(); ns->next()) {
+            // Do we have IP for this specific NS?
+            if (hasAddress(dynamic_cast<const rdata::generic::NS&>(
+                               ns->getCurrent()).getNSName(), rrclass,
+                           cache)) {
+                // Found one, stop checking and use this zone
+                // (there may be more addresses, that's only better)
+                return (cachedNS->getName().toText());
+            }
+        }
+        // We don't have anything for this one, so try something higher
+        if (name.getLabelCount() > 1) {
+            name = name.split(1);
+        }
+    }
+    // Fallback, nothing found, start at root
+    return (".");
+}
+
 typedef std::vector<std::pair<std::string, uint16_t> > AddressVector;
 
 // Here we do not use the typedef above, as the SunStudio compiler
@@ -239,7 +299,6 @@ private:
     // if we have a response for our query stored already. if
     // so, call handlerecursiveresponse(), if not, we call send()
     void doLookup() {
-        cur_zone_ = ".";
         dlog("doLookup: try cache");
         Message cached_message(Message::RENDER);
         isc::resolve::initResponseMessage(question_, cached_message);
@@ -255,9 +314,12 @@ private:
                 stop();
             }
         } else {
+            dlog("doLookup: get lowest usable delegation from cache");
+            cur_zone_ = deepestDelegation(question_.getName(),
+                                          question_.getClass(), cache_);
             send();
         }
-        
+
     }
 
     // Send the current question to the given nameserver address

src/lib/resolve/tests/recursive_query_unittest.cc

@@ -31,7 +31,9 @@
 #include <dns/rcode.h>
 
 #include <util/buffer.h>
+#include <util/unittests/resolver.h>
 #include <dns/message.h>
+#include <dns/rdataclass.h>
 
 #include <nsas/nameserver_address_store.h>
 #include <cache/resolver_cache.h>
@@ -59,6 +61,18 @@ using namespace isc::asiolink;
 using namespace isc::dns;
 using namespace isc::util;
 
+namespace isc {
+namespace asiodns {
+
+// This is defined in recursive_query.cc, but not in header (it's not public
+// function). So bring it in to be tested.
+std::string
+deepestDelegation(Name name, RRClass rrclass,
+                  isc::cache::ResolverCache& cache);
+
+}
+}
+
 namespace {
 const char* const TEST_SERVER_PORT = "53535";
 const char* const TEST_CLIENT_PORT = "53536";
@@ -110,6 +124,9 @@ class RecursiveQueryTest : public ::testing::Test {
 protected:
     RecursiveQueryTest();
     ~RecursiveQueryTest() {
+        // It would delete itself, but after the io_service_, which could
+        // segfailt in case there were unhandled requests
+        resolver_.reset();
         if (res_ != NULL) {
             freeaddrinfo(res_);
         }
@@ -348,12 +365,6 @@ protected:
         private:
             bool* done_;
     };
-    
-    class MockResolver : public isc::resolve::ResolverInterface {
-        void resolve(const QuestionPtr& question,
-                     const ResolverInterface::CallbackPtr& callback) {
-        }
-    };
 
     // This version of mock server just stops the io_service when it is resumed
     // the second time. (Used in the clientTimeout test, where resume
@@ -423,16 +434,17 @@ protected:
     vector<uint8_t> callback_data_;
     int sock_;
     struct addrinfo* res_;
+    boost::shared_ptr<isc::util::unittests::TestResolver> resolver_;
 };
 
 RecursiveQueryTest::RecursiveQueryTest() :
     dns_service_(NULL), callback_(NULL), callback_protocol_(0),
-    callback_native_(-1), sock_(-1), res_(NULL)
+    callback_native_(-1), sock_(-1), res_(NULL),
+    resolver_(new isc::util::unittests::TestResolver())
 {
     io_service_ = new IOService();
     setDNSService(true, true);
-    boost::shared_ptr<MockResolver>mock_resolver(new MockResolver());
-    nsas_ = new isc::nsas::NameserverAddressStore(mock_resolver);
+    nsas_ = new isc::nsas::NameserverAddressStore(resolver_);
 }
 
 TEST_F(RecursiveQueryTest, v6UDPSend) {
@@ -857,7 +869,88 @@ TEST_F(RecursiveQueryTest, DISABLED_recursiveSendNXDOMAIN) {
     EXPECT_EQ(0, answer->getRRCount(Message::SECTION_ANSWER));
 }
 
+// Test that we don't start at root when we have a lower NS cached.
+TEST_F(RecursiveQueryTest, CachedNS) {
+    setDNSService(true, true);
+
+    // Check we have a reasonable fallback - if there's nothing of interest
+    // in the cache, start at root.
+    EXPECT_EQ(".", deepestDelegation(Name("www.somewhere.deep.example.org"),
+                                     RRClass::IN(), cache_));
+
+    // Prefill the cache. There's a zone with a NS and IP address for one
+    // of them (to see that one is enough) and another deeper one, with NS,
+    // but without IP.
+    RRsetPtr nsUpper(new RRset(Name("example.org"), RRClass::IN(),
+                               RRType::NS(), RRTTL(300)));
+    nsUpper->addRdata(rdata::generic::NS(Name("ns.example.org")));
+    nsUpper->addRdata(rdata::generic::NS(Name("ns2.example.org")));
+
+    RRsetPtr nsLower(new RRset(Name("somewhere.deep.example.org"),
+                               RRClass::IN(), RRType::NS(), RRTTL(300)));
+    nsLower->addRdata(rdata::generic::NS(Name("ns.somewhere.deep.example.org"))
+                      );
+
+    RRsetPtr nsIp(new RRset(Name("ns2.example.org"), RRClass::IN(),
+                            RRType::A(), RRTTL(300)));
+    nsIp->addRdata(rdata::in::A("192.0.2.1"));
+
+    // Make sure the test runs in the correct environment (we don't test
+    // the cache, but we need it to unswer this way for the test, so we
+    // just make sure)
+    ASSERT_TRUE(cache_.update(nsUpper));
+    ASSERT_TRUE(cache_.update(nsLower));
+    ASSERT_TRUE(cache_.update(nsIp));
+    RRsetPtr deepest(cache_.lookupDeepestNS(Name(
+        "www.somewhere.deep.example.org"), RRClass::IN()));
+    ASSERT_NE(RRsetPtr(), deepest);
+    ASSERT_EQ(nsLower->getName(), deepest->getName());
+
+    // Direct check of the function that chooses the delegation point
+    // It should not use nsLower, because we don't have IP address for
+    // that one. But it can choose nsUpper.
+    EXPECT_EQ("example.org.",
+              deepestDelegation(Name("www.somewhere.deep.example.org"),
+              RRClass::IN(), cache_));
+
+    // Now more complex and indirect test:
+    // We ask it to resolve the name for us. It will pick up a delegation
+    // point and ask NSAS for it. NSAS will in turn ask resolver for NS record
+    // of the delegation point. We then pick it up from the fake resolver
+    // and check it is the correct one. This checks the delegation point
+    // travels safely trough the whole path there (it would be enough to check
+    // it up to NSAS, but replacing NSAS is more complicated, so we just
+    // include in the test as well for simplicity).
+
+    // Prepare the recursive query
+    vector<pair<string, uint16_t> > roots;
+    roots.push_back(pair<string, uint16_t>("192.0.2.2", 53));
+
+    RecursiveQuery rq(*dns_service_, *nsas_, cache_,
+                      vector<pair<string, uint16_t> >(), roots);
+    // Ask a question at the bottom. It should not use the lower NS, because
+    // it would lead to a loop in NS. But it can use the nsUpper one, it has
+    // an IP address and we can avoid asking root.
+    Question q(Name("www.somewhere.deep.example.org"), RRClass::IN(),
+               RRType::A());
+    OutputBufferPtr buffer(new OutputBuffer(0));
+    MessagePtr answer(new Message(Message::RENDER));
+    // The server is here so we have something to pass there
+    MockServer server(*io_service_);
+    rq.resolve(q, answer, buffer, &server);
+    // We don't need to run the service in this test. We are interested only
+    // in the place it starts resolving at
+
+    // Look what is asked by NSAS - it should be our delegation point.
+    EXPECT_NO_THROW(EXPECT_EQ(nsUpper->getName(),
+                              (*resolver_)[0]->getName()) <<
+                    "It starts resolving at the wrong place") <<
+        "It does not ask NSAS anything, how does it know where to send?";
+}
+
 // TODO: add tests that check whether the cache is updated on succesfull
 // responses, and not updated on failures.
 
+
+
 }

src/lib/util/unittests/Makefile.am

@@ -2,6 +2,6 @@ AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
 AM_CXXFLAGS = $(B10_CXXFLAGS)
 
 lib_LTLIBRARIES = libutil_unittests.la
-libutil_unittests_la_SOURCES = fork.h fork.cc
+libutil_unittests_la_SOURCES = fork.h fork.cc resolver.h
 
 CLEANFILES = *.gcno *.gcda

src/lib/util/unittests/resolver.h

@@ -0,0 +1,193 @@
+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#ifndef UTIL_UNITTEST_RESOLVER_H
+#define UTIL_UNITTEST_RESOLVER_H
+
+/// \file resolver.h
+/// \brief Fake resolver
+
+#include <map>
+#include <dns/rrset.h>
+#include <dns/question.h>
+#include <dns/message.h>
+#include <dns/opcode.h>
+#include <dns/rcode.h>
+#include <dns/rrttl.h>
+#include <resolve/resolver_interface.h>
+#include <gtest/gtest.h>
+
+namespace isc {
+namespace util {
+namespace unittests {
+
+/// \brief Put rrset into a message as an answer
+inline static isc::dns::MessagePtr
+createResponseMessage(isc::dns::RRsetPtr answer_rrset)
+{
+    isc::dns::MessagePtr response(new isc::dns::Message(
+        isc::dns::Message::RENDER));
+    response->setOpcode(isc::dns::Opcode::QUERY());
+    response->setRcode(isc::dns::Rcode::NOERROR());
+    response->addRRset(isc::dns::Message::SECTION_ANSWER, answer_rrset);
+    return response;
+}
+
+/// \brief Mock resolver
+///
+/// This class pretends to be a resolver. However, it only stores the
+/// requests and can answer them right away by prepared answers. It doesn't
+/// do any real work and is intended for testing purposes.
+class TestResolver : public isc::resolve::ResolverInterface {
+    private:
+        bool checkIndex(size_t index) {
+            return (requests.size() > index);
+        }
+
+        typedef std::map<isc::dns::Question, isc::dns::RRsetPtr>
+            PresetAnswers;
+        PresetAnswers answers_;
+    public:
+        typedef std::pair<isc::dns::QuestionPtr, CallbackPtr> Request;
+        /// \brief List of requests the tested class sent trough resolve
+        std::vector<Request> requests;
+
+        /// \brief Destructor
+        ///
+        /// This is important.  All callbacks in the requests vector must be
+        /// called to remove them from internal loops.  Without this, destroying
+        /// the NSAS object will leave memory assigned.
+        ~TestResolver() {
+            for (size_t i = 0; i < requests.size(); ++i) {
+                requests[i].second->failure();
+            }
+        }
+
+        /// \brief Testing version of resolve
+        ///
+        /// If there's a prepared answer (provided by addPresetAnswer), it
+        /// answers it right away. Otherwise it just stores the request in
+        /// the requests member so it can be examined later.
+        virtual void resolve(const isc::dns::QuestionPtr& q,
+                             const CallbackPtr& c)
+        {
+            PresetAnswers::iterator it(answers_.find(*q));
+            if (it == answers_.end()) {
+                requests.push_back(Request(q, c));
+            } else {
+                if (it->second) {
+                    c->success(createResponseMessage(it->second));
+                } else {
+                    c->failure();
+                }
+            }
+        }
+
+        /// \brief Add a preset answer.
+        ///
+        /// Add a preset answer. If shared_ptr() is passed (eg. NULL),
+        /// it will generate failure. If the question is not preset,
+        /// it goes to requests and you can answer later.
+        void addPresetAnswer(const isc::dns::Question& question,
+            isc::dns::RRsetPtr answer)
+        {
+            answers_[question] = answer;
+        }
+
+        /// \brief Thrown if the query at the given index does not exist.
+        class NoSuchRequest : public std::exception { };
+
+        /// \brief Thrown if the answer does not match the query
+        class DifferentRequest : public std::exception { };
+
+        /// \brief Provides the question of request on given answer
+        isc::dns::QuestionPtr operator[](size_t index) {
+            if (index >= requests.size()) {
+                throw NoSuchRequest();
+            }
+            return (requests[index].first);
+        }
+        /// \brief Test it asks for IP addresses
+        /// Looks if the two provided requests in resolver are A and AAAA.
+        /// Sorts them so index1 is A.
+        ///
+        /// Returns false if there aren't enough elements
+        bool asksIPs(const isc::dns::Name& name, size_t index1,
+                     size_t index2)
+        {
+            size_t max = (index1 < index2) ? index2 : index1;
+            if (!checkIndex(max)) {
+                return false;
+            }
+            EXPECT_EQ(name, (*this)[index1]->getName());
+            EXPECT_EQ(name, (*this)[index2]->getName());
+            EXPECT_EQ(isc::dns::RRClass::IN(), (*this)[index1]->getClass());
+            EXPECT_EQ(isc::dns::RRClass::IN(), (*this)[index2]->getClass());
+            // If they are the other way around, swap
+            if ((*this)[index1]->getType() == isc::dns::RRType::AAAA() &&
+                (*this)[index2]->getType() == isc::dns::RRType::A())
+            {
+                TestResolver::Request tmp((*this).requests[index1]);
+                (*this).requests[index1] =
+                    (*this).requests[index2];
+                (*this).requests[index2] = tmp;
+            }
+            // Check the correct addresses
+            EXPECT_EQ(isc::dns::RRType::A(), (*this)[index1]->getType());
+            EXPECT_EQ(isc::dns::RRType::AAAA(), (*this)[index2]->getType());
+            return (true);
+        }
+
+        /// \brief Answer a request
+        /// Sends a simple answer to a query.
+        /// 1) Provide index of a query and the address(es) to pass.
+        /// 2) Provide index of query and components of address to pass.
+        void answer(size_t index, isc::dns::RRsetPtr& set) {
+            if (index >= requests.size()) {
+                throw NoSuchRequest();
+            }
+            requests[index].second->success(createResponseMessage(set));
+        }
+
+        void answer(size_t index, const isc::dns::Name& name,
+                    const isc::dns::RRType& type,
+                    const isc::dns::rdata::Rdata& rdata, size_t TTL = 100)
+        {
+            isc::dns::RRsetPtr set(new isc::dns::RRset(name,
+                                                       isc::dns::RRClass::IN(),
+                                                       type,
+                                                       isc::dns::RRTTL(TTL)));
+            set->addRdata(rdata);
+            answer(index, set);
+        }
+        /// \Answer the query at index by list of nameservers
+        void provideNS(size_t index, isc::dns::RRsetPtr nameservers)
+        {
+            if (index >= requests.size()) {
+                throw NoSuchRequest();
+            }
+            if (requests[index].first->getName() != nameservers->getName() ||
+                requests[index].first->getType() != isc::dns::RRType::NS())
+            {
+                throw DifferentRequest();
+            }
+            requests[index].second->success(createResponseMessage(nameservers));
+        }
+};
+
+}
+}
+}
+
+#endif