kea/src/bin/auth/tests/statistics_unittest.cc.pre

// Copyright (C) 2010  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.

#include <config.h>

#include <gtest/gtest.h>

#include <boost/bind.hpp>

#include <dns/opcode.h>
#include <dns/rcode.h>
#include <dns/rrttl.h>

#include <cc/data.h>

#include <auth/statistics.h>
#include <auth/statistics_items.h>

#include <dns/tests/unittest_util.h>

#include <string>
#include <map>

#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

using namespace std;
using namespace isc::dns;
using namespace isc::data;
using namespace isc::auth::statistics;

namespace {

// ### STATISTICS ITEMS DEFINITION ###

class CountersTest : public ::testing::Test {
protected:
    CountersTest() : counters() {}
    ~CountersTest() {}
    Counters counters;
};

// flatten counters
void
flatten(std::map<std::string, int>& flat_map, const std::string& prefix,
        const isc::data::ConstElementPtr map_element) {
    std::map<std::string, ConstElementPtr> map = map_element->mapValue();
    for (std::map<std::string, ConstElementPtr>::const_iterator
             i = map.begin(), e = map.end();
         i != e;
         ++i)
    {
        switch (i->second->getType()) {
            case isc::data::Element::map:
                flatten(flat_map, i->first + ".", i->second);
                break;
            case isc::data::Element::integer:
                flat_map[prefix + i->first] = i->second->intValue();
                break;
            default:
                FAIL() << "Element Parse Error";
        }
    }
}

// Test if the counters has expected values specified in expect and the others
// are zero.
void
checkCounters(const isc::data::ConstElementPtr counters,
              const std::map<std::string, int>& expect)
{
    std::map<std::string, int> stats_map;
    flatten(stats_map, "", counters);

    for (std::map<std::string, int>::const_iterator
            i = stats_map.begin(), e = stats_map.end();
            i != e;
            ++i)
    {
        const int value =
            expect.find(i->first) == expect.end() ?
                0 : expect.find(i->first)->second;
        EXPECT_EQ(value, i->second) << "Expected counter "
            << i->first << " = " << value << ", actual: "
            << i->second;
    }
}

TEST_F(CountersTest, incrementResponse) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test response counters are incremented only if responded == true.
    for (int i = 0; i < 2; ++i) {
        const bool responded = i & 1;

        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::QUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);

        response.setRcode(Rcode::REFUSED());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::AAAA()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        counters.inc(msgattrs, response, responded);

        expect.clear();
        expect["opcode.query"] = i+1;
        expect["request.v4"] = i+1;
        expect["request.udp"] = i+1;
        expect["request.edns0"] = i+1;
        expect["request.badednsver"] = 0;
        expect["request.dnssec_ok"] = i+1;
        expect["responses"] = responded ? 1 : 0;
        expect["qrynoauthans"] = responded ? 1 : 0;
        expect["rcode.refused"] = responded ? 1 : 0;
        expect["authqryrej"] = responded ? 1 : 0;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementProtocolType) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test these patterns:
    //      af     protocol
    //     -----------------
    //      ipv4   udp
    //      ipv6   udp
    //      ipv4   tcp
    //      ipv6   tcp
    int count_v4 = 0, count_v6 = 0, count_udp = 0, count_tcp = 0;
    for (int i = 0; i < 4; ++i) {
        const int af = i & 1 ? AF_INET : AF_INET6;
        const int proto = i & 2 ? IPPROTO_UDP : IPPROTO_TCP;

        msgattrs.setRequestIPVersion(af);
        msgattrs.setRequestTransportProtocol(proto);
        msgattrs.setRequestOpCode(Opcode::QUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);

        response.setRcode(Rcode::REFUSED());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::AAAA()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        counters.inc(msgattrs, response, true);

        if (af == AF_INET) {
            ++count_v4;
        } else {
            ++count_v6;
        }
        if (proto == IPPROTO_UDP) {
            ++count_udp;
        } else {
            ++count_tcp;
        }

        expect.clear();
        expect["opcode.query"] = i+1;
        expect["request.v4"] = count_v4;
        expect["request.v6"] = count_v6;
        expect["request.udp"] = count_udp;
        expect["request.tcp"] = count_tcp;
        expect["request.edns0"] = i+1;
        expect["request.badednsver"] = 0;
        expect["request.dnssec_ok"] = i+1;
        expect["responses"] = i+1;
        expect["qrynoauthans"] = i+1;
        expect["rcode.refused"] = i+1;
        expect["authqryrej"] = i+1;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementDO) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test these patterns:
    //     DNSSEC OK
    //    -----------
    //     false
    //     true
    for (int i = 0; i < 2; ++i) {
        const bool is_dnssec_ok = i & 1;
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::QUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(is_dnssec_ok);

        response.setRcode(Rcode::REFUSED());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::AAAA()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        counters.inc(msgattrs, response, true);

        expect.clear();
        expect["opcode.query"] = i+1;
        expect["request.v4"] = i+1;
        expect["request.udp"] = i+1;
        expect["request.edns0"] = i+1;
        expect["request.badednsver"] = 0;
        expect["request.dnssec_ok"] = i & 1;
        expect["responses"] = i+1;
        expect["qrynoauthans"] = i+1;
        expect["rcode.refused"] = i+1;
        expect["authqryrej"] = i+1;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementEDNS) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test these patterns:
    //     request edns0   response edns0
    //    --------------------------------
    //     false           true
    //     true            false
    //
    // They can't be both true since edns0 and badednsver are exclusive.
    int count_req_edns0 = 0, count_res_edns0 = 0;
    for (int i = 0; i < 2; ++i) {
        const bool is_edns0 = i & 1;
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::QUERY());
        msgattrs.setRequestEDNS0(is_edns0);
        msgattrs.setRequestDO(true);

        if (!is_edns0) {
            ConstEDNSPtr edns = EDNSPtr(new EDNS(0));
            response.setEDNS(edns);
        } else {
            response.setEDNS(EDNSPtr());
        }
        response.setRcode(Rcode::REFUSED());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::AAAA()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        counters.inc(msgattrs, response, true);

        if (is_edns0) {
            ++count_req_edns0;
        } else {
            ++count_res_edns0;
        }

        expect.clear();
        expect["opcode.query"] = i+1;
        expect["request.v4"] = i+1;
        expect["request.udp"] = i+1;
        expect["request.edns0"] = count_req_edns0;
        expect["response.edns0"] = count_res_edns0;
        expect["request.badednsver"] = 0;
        expect["request.dnssec_ok"] = i+1;
        expect["responses"] = i+1;
        expect["qrynoauthans"] = i+1;
        expect["rcode.refused"] = i+1;
        expect["authqryrej"] = i+1;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementTSIG) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test these patterns:
    //      signature  badsig
    //     -------------------
    //      (none)     false
    //      TSIG       false
    //      TSIG       true
    //
    // badsig can't be true if the message does not have signature.
    int count_req_tsig = 0, count_res_tsig = 0, count_badsig = 0;
    for (int i = 0; i < 3; ++i) {
        const bool is_tsig = (i == 2) ? true : i & 1;
        const bool is_badsig = i & 2;
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::QUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);
        msgattrs.setRequestSig(is_tsig, is_badsig);

        response.setRcode(Rcode::REFUSED());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::AAAA()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        // don't increment response counters if signature is bad
        counters.inc(msgattrs, response, !is_badsig);

        if (is_tsig) {
            ++count_req_tsig;
            if (!is_badsig) {
                ++count_res_tsig;
            }
        }
        if (is_badsig) {
            ++count_badsig;
        }

        expect.clear();
        expect["request.v4"] = i+1;
        expect["request.udp"] = i+1;
        expect["opcode.query"] = i+1 - count_badsig;
        expect["request.edns0"] = i+1 - count_badsig;
        expect["request.badednsver"] = 0;
        expect["request.dnssec_ok"] = i+1 - count_badsig;
        expect["request.tsig"] = count_req_tsig;
        expect["response.tsig"] = count_res_tsig;
        expect["request.sig0"] = 0;
        expect["request.badsig"] = count_badsig;
        expect["responses"] = i+1 - count_badsig;
        expect["qrynoauthans"] = i+1 - count_badsig;
        expect["rcode.refused"] = i+1 - count_badsig;
        expect["authqryrej"] = i+1 - count_badsig;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementOpcode) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test all opcodes (QUERY..RESERVED15)
    int count_all = 0, count_opcode_other = 0;
    for (uint8_t i = Opcode::QUERY().getCode(),
                 e = Opcode::RESERVED15().getCode();
         i <= e;
         ++i)
    {
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode(i));
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);
        msgattrs.setRequestSig(false, false);

        response.setRcode(Rcode::REFUSED());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::AAAA()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        for (uint8_t j = 0; j < i; ++j) {
            // count up i times for i-th opcode to identify counters
            counters.inc(msgattrs, response, true);
            ++count_all;
        }

        expect.clear();
        expect["request.v4"] = count_all;
        expect["request.udp"] = count_all;
        expect["request.edns0"] = count_all;
        expect["request.badednsver"] = 0;
        expect["request.dnssec_ok"] = count_all;
        expect["request.tsig"] = 0;
        expect["request.sig0"] = 0;
        expect["request.badsig"] = 0;
        expect["responses"] = count_all;
        expect["rcode.refused"] = count_all;
        if (opcode_to_msgcounter[i] == MSG_OPCODE_OTHER) {
            count_opcode_other += i;
        }
        for (uint8_t j = 0; j <= i; ++j) {
            if (opcode_to_msgcounter[j] == MSG_OPCODE_OTHER) {
                expect["opcode.other"] = count_opcode_other;
            } else {
                std::string code_text = Opcode(j).toText();
                std::transform(code_text.begin(), code_text.end(),
                               code_text.begin(), ::tolower);
                expect["opcode."+code_text] = j;
            }
        }
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementRcode) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test all rcodes (NOERROR..BADVERS)
    int count_all = 0, count_rcode_other = 0, count_ednsbadver = 0;
    for (uint16_t i = Rcode::NOERROR().getCode(),
                  e = Rcode::BADVERS().getCode();
         i <= e;
         ++i)
    {
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::IQUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);
        msgattrs.setRequestSig(false, false);

        response.setRcode(Rcode(i));
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::AAAA()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        for (uint16_t j = 0; j < i; ++j) {
            // count up i times for i-th rcode to identify counters
            counters.inc(msgattrs, response, true);
            ++count_all;
        }

        expect.clear();
        expect["opcode.iquery"] = count_all;
        expect["request.v4"] = count_all;
        expect["request.udp"] = count_all;
        expect["request.edns0"] = count_all;
        expect["request.dnssec_ok"] = count_all;
        expect["request.tsig"] = 0;
        expect["request.sig0"] = 0;
        expect["request.badsig"] = 0;
        expect["responses"] = count_all;
        if (rcode_to_msgcounter[i] == MSG_RCODE_OTHER) {
            count_rcode_other += i;
        }
        // "request.badednsver" counts for Rcode == BADVERS
        if (rcode_to_msgcounter[i] == MSG_RCODE_BADVERS) {
            count_ednsbadver += i;
        }
        expect["request.badednsver"] = count_ednsbadver;
        for (uint16_t j = 0; j <= i; ++j) {
            if (rcode_to_msgcounter[j] == MSG_RCODE_OTHER) {
                expect["rcode.other"] = count_rcode_other;
            } else {
                std::string code_text = Rcode(j).toText();
                std::transform(code_text.begin(), code_text.end(),
                               code_text.begin(), ::tolower);
                expect["rcode."+code_text] = j;
            }
        }
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementTruncated) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Test these patterns:
    //      truncated
    //     -----------
    //      false
    //      true
    int count_truncated = 0;
    for (int i = 0; i < 2; ++i) {
        const bool is_truncated = i & 1;
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::IQUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);
        msgattrs.setRequestSig(false, false);
        msgattrs.setResponseTruncated(is_truncated);

        response.setRcode(Rcode::SERVFAIL());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::TXT()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);

        counters.inc(msgattrs, response, true);

        if (is_truncated) {
            ++count_truncated;
        }

        expect.clear();
        expect["opcode.iquery"] = i+1;
        expect["request.v4"] = i+1;
        expect["request.udp"] = i+1;
        expect["request.edns0"] = i+1;
        expect["request.dnssec_ok"] = i+1;
        expect["responses"] = i+1;
        expect["rcode.servfail"] = i+1;
        expect["response.truncated"] = count_truncated;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementQryAuthAnsAndNoAuthAns) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Opcode = QUERY, ANCOUNT = 0 (don't care), Rcode = SERVFAIL (don't care)
    // Test these patterns:
    //      AA flag
    //     -----------------------
    //      false -> QryNoAuthAns
    //      true  -> QryAuthAns
    int count_authans = 0, count_noauthans = 0;
    for (int i = 0; i < 2; ++i) {
        const bool is_aa_set = i & 1;
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::QUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);
        msgattrs.setRequestSig(false, false);

        response.setRcode(Rcode::SERVFAIL());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::TXT()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);
        if (is_aa_set) {
            response.setHeaderFlag(Message::HEADERFLAG_AA);
            ++count_authans;
        } else {
            ++count_noauthans;
        }

        counters.inc(msgattrs, response, true);

        expect.clear();
        expect["opcode.query"] = i+1;
        expect["request.v4"] = i+1;
        expect["request.udp"] = i+1;
        expect["request.edns0"] = i+1;
        expect["request.dnssec_ok"] = i+1;
        expect["responses"] = i+1;
        expect["rcode.servfail"] = i+1;
        expect["qryauthans"] = count_authans;
        expect["qrynoauthans"] = count_noauthans;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementQrySuccess) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Opcode = QUERY, Rcode = NOERROR, ANCOUNT > 0
    msgattrs.setRequestIPVersion(AF_INET);
    msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
    msgattrs.setRequestOpCode(Opcode::QUERY());
    msgattrs.setRequestEDNS0(true);
    msgattrs.setRequestDO(true);
    msgattrs.setRequestSig(false, false);

    response.setRcode(Rcode::NOERROR());
    response.addQuestion(Question(Name("example.com"),
                                  RRClass::IN(), RRType::TXT()));
    RRsetPtr answer_rrset(new RRset(Name("example.com"),
                                    RRClass::IN(), RRType::TXT(),
                                    RRTTL(3600)));
    answer_rrset->addRdata(rdata::createRdata(RRType::TXT(),
                                              RRClass::IN(),
                                              "Answer"));
    response.addRRset(Message::SECTION_ANSWER, answer_rrset);
    response.setHeaderFlag(Message::HEADERFLAG_QR);

    counters.inc(msgattrs, response, true);

    expect.clear();
    expect["opcode.query"] = 1;
    expect["request.v4"] = 1;
    expect["request.udp"] = 1;
    expect["request.edns0"] = 1;
    expect["request.dnssec_ok"] = 1;
    expect["responses"] = 1;
    expect["rcode.noerror"] = 1;
    expect["qrysuccess"] = 1;
    // noauthans is also incremented
    expect["qrynoauthans"] = 1;
    checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
}

TEST_F(CountersTest, incrementQryReferralAndNxrrset) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Opcode = QUERY, Rcode = NOERROR, ANCOUNT = 0
    // Test these patterns:
    //      AA flag
    //     ----------------------
    //      false -> QryReferral
    //      true  -> QryNxrrset
    int count_referral = 0, count_nxrrset = 0;
    for (int i = 0; i < 2; ++i) {
        const bool is_aa_set = i & 1;
        msgattrs.setRequestIPVersion(AF_INET);
        msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
        msgattrs.setRequestOpCode(Opcode::QUERY());
        msgattrs.setRequestEDNS0(true);
        msgattrs.setRequestDO(true);
        msgattrs.setRequestSig(false, false);

        response.setRcode(Rcode::NOERROR());
        response.addQuestion(Question(Name("example.com"),
                                      RRClass::IN(), RRType::TXT()));
        response.setHeaderFlag(Message::HEADERFLAG_QR);
        if (is_aa_set) {
            response.setHeaderFlag(Message::HEADERFLAG_AA);
            ++count_nxrrset;
        } else {
            ++count_referral;
        }

        counters.inc(msgattrs, response, true);

        expect.clear();
        expect["opcode.query"] = i+1;
        expect["request.v4"] = i+1;
        expect["request.udp"] = i+1;
        expect["request.edns0"] = i+1;
        expect["request.dnssec_ok"] = i+1;
        expect["responses"] = i+1;
        expect["rcode.noerror"] = i+1;
        expect["qrynxrrset"] = count_nxrrset;
        expect["qryreferral"] = count_referral;
        // qryauthans or qrynoauthans is also incremented
        expect["qryauthans"] = count_nxrrset;
        expect["qrynoauthans"] = count_referral;
        checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
    }
}

TEST_F(CountersTest, incrementAuthQryRej) {
    Message response(Message::RENDER);
    MessageAttributes msgattrs;
    std::map<std::string, int> expect;

    // Opcode = QUERY, Rcode = REFUSED, ANCOUNT = 0 (don't care)
    msgattrs.setRequestIPVersion(AF_INET);
    msgattrs.setRequestTransportProtocol(IPPROTO_UDP);
    msgattrs.setRequestOpCode(Opcode::QUERY());
    msgattrs.setRequestEDNS0(true);
    msgattrs.setRequestDO(true);
    msgattrs.setRequestSig(false, false);

    response.setRcode(Rcode::REFUSED());
    response.addQuestion(Question(Name("example.com"),
                                  RRClass::IN(), RRType::TXT()));
    response.setHeaderFlag(Message::HEADERFLAG_QR);

    counters.inc(msgattrs, response, true);

    expect.clear();
    expect["opcode.query"] = 1;
    expect["request.v4"] = 1;
    expect["request.udp"] = 1;
    expect["request.edns0"] = 1;
    expect["request.dnssec_ok"] = 1;
    expect["responses"] = 1;
    expect["rcode.refused"] = 1;
    expect["authqryrej"] = 1;
    // noauthans is also incremented since AA bit is not set
    expect["qrynoauthans"] = 1;
    checkCounters(counters.get()->get("zones")->get("_SERVER_"), expect);
}

int
countTreeElements(const struct CounterSpec* tree) {
    int count = 0;
    for (int i = 0; tree[i].name != NULL; ++i) {
        if (tree[i].sub_counters == NULL) {
            ++count;
        } else {
            count += countTreeElements(tree[i].sub_counters);
        }
    }
    return (count);
}

TEST(StatisticsItemsTest, MSGItemNamesCheck) {
    EXPECT_EQ(MSG_COUNTER_TYPES, countTreeElements(msg_counter_tree));
}

}