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// Copyright (C) 2009  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.

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#include <config.h>

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#include <netinet/in.h>

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#include <algorithm>
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#include <cassert>
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#include <iostream>
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#include <vector>
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#include <memory>
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#include <boost/bind.hpp>

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#include <asiolink/asiolink.h>

#include <config/ccsession.h>

#include <cc/data.h>

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#include <exceptions/exceptions.h>

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#include <util/buffer.h>
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#include <dns/edns.h>
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#include <dns/exceptions.h>
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#include <dns/messagerenderer.h>
#include <dns/name.h>
#include <dns/question.h>
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#include <dns/opcode.h>
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#include <dns/rcode.h>
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#include <dns/rrset.h>
#include <dns/rrttl.h>
#include <dns/message.h>
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#include <dns/tsig.h>
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#include <datasrc/query.h>
#include <datasrc/data_source.h>
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#include <datasrc/memory_datasrc.h>
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#include <datasrc/static_datasrc.h>
#include <datasrc/sqlite3_datasrc.h>
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#include <xfr/xfrout_client.h>

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#include <auth/common.h>
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#include <auth/auth_config.h>
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#include <auth/auth_srv.h>
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#include <auth/query.h>
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#include <auth/statistics.h>
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#include <auth/auth_log.h>
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using namespace std;

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using namespace isc;
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using namespace isc::cc;
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using namespace isc::datasrc;
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using namespace isc::dns;
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using namespace isc::util;
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using namespace isc::auth;
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using namespace isc::dns::rdata;
using namespace isc::data;
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using namespace isc::config;
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using namespace isc::xfr;
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using namespace isc::asiolink;
using namespace isc::asiodns;
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using namespace isc::server_common::portconfig;
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using boost::shared_ptr;
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class AuthSrvImpl {
private:
    // prohibit copy
    AuthSrvImpl(const AuthSrvImpl& source);
    AuthSrvImpl& operator=(const AuthSrvImpl& source);
public:
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    AuthSrvImpl(const bool use_cache, AbstractXfroutClient& xfrout_client);
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    ~AuthSrvImpl();
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    isc::data::ConstElementPtr setDbFile(isc::data::ConstElementPtr config);
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    bool processNormalQuery(const IOMessage& io_message, MessagePtr message,
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                            OutputBufferPtr buffer,
                            auto_ptr<TSIGContext> tsig_context);
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    bool processAxfrQuery(const IOMessage& io_message, MessagePtr message,
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                          OutputBufferPtr buffer,
                          auto_ptr<TSIGContext> tsig_context);
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    bool processNotify(const IOMessage& io_message, MessagePtr message,
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                       OutputBufferPtr buffer,
                       auto_ptr<TSIGContext> tsig_context);
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    IOService io_service_;

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    /// Currently non-configurable, but will be.
    static const uint16_t DEFAULT_LOCAL_UDPSIZE = 4096;

    /// These members are public because AuthSrv accesses them directly.
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    ModuleCCSession* config_session_;
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    AbstractSession* xfrin_session_;

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    /// In-memory data source.  Currently class IN only for simplicity.
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    const RRClass memory_client_class_;
    AuthSrv::InMemoryClientPtr memory_client_;
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    /// Hot spot cache
    isc::datasrc::HotCache cache_;
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    /// Interval timer for periodic submission of statistics counters.
    IntervalTimer statistics_timer_;

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    /// Query counters for statistics
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    AuthCounters counters_;
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    /// Addresses we listen on
    AddressList listen_addresses_;
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    /// The TSIG keyring
    const shared_ptr<TSIGKeyRing>* keyring_;
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private:
    std::string db_file_;

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    MetaDataSrc data_sources_;
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    /// We keep a pointer to the currently running sqlite datasource
    /// so that we can specifically remove that one should the database
    /// file change
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    ConstDataSrcPtr cur_datasrc_;
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    bool xfrout_connected_;
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    AbstractXfroutClient& xfrout_client_;
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    /// Increment query counter
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    void incCounter(const int protocol);
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};

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AuthSrvImpl::AuthSrvImpl(const bool use_cache,
                         AbstractXfroutClient& xfrout_client) :
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    config_session_(NULL),
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    xfrin_session_(NULL),
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    memory_client_class_(RRClass::IN()),
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    statistics_timer_(io_service_),
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    counters_(),
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    keyring_(NULL),
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    xfrout_connected_(false),
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    xfrout_client_(xfrout_client)
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{
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    // cur_datasrc_ is automatically initialized by the default constructor,
    // effectively being an empty (sqlite) data source.  once ccsession is up
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    // the datasource will be set by the configuration setting
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    // add static data source
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    data_sources_.addDataSrc(ConstDataSrcPtr(new StaticDataSrc));
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    // enable or disable the cache
    cache_.setEnabled(use_cache);
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}

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AuthSrvImpl::~AuthSrvImpl() {
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    if (xfrout_connected_) {
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        xfrout_client_.disconnect();
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        xfrout_connected_ = false;
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    }
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}
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// This is a derived class of \c DNSLookup, to serve as a
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// callback in the asiolink module.  It calls
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// AuthSrv::processMessage() on a single DNS message.
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class MessageLookup : public DNSLookup {
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public:
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    MessageLookup(AuthSrv* srv) : server_(srv) {}
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    virtual void operator()(const IOMessage& io_message,
                            MessagePtr message,
                            MessagePtr answer_message,
                            OutputBufferPtr buffer,
                            DNSServer* server) const
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    {
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        (void) answer_message;
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        server_->processMessage(io_message, message, buffer, server);
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    }
private:
    AuthSrv* server_;
};

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// This is a derived class of \c DNSAnswer, to serve as a callback in the
// asiolink module.  We actually shouldn't do anything in this class because
// we build complete response messages in the process methods; otherwise
// the response message will contain trailing garbage.  In future, we should
// probably even drop the reliance on DNSAnswer.  We don't need the coroutine
// tricks provided in that framework, and its overhead would be significant
// in terms of performance consideration for the authoritative server
// implementation.
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class MessageAnswer : public DNSAnswer {
public:
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    MessageAnswer(AuthSrv*) {}
    virtual void operator()(const IOMessage&, MessagePtr,
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                            MessagePtr, OutputBufferPtr) const
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    {}
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};

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// This is a derived class of \c SimpleCallback, to serve
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// as a callback in the asiolink module.  It checks for queued
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// configuration messages, and executes them if found.
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class ConfigChecker : public SimpleCallback {
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public:
    ConfigChecker(AuthSrv* srv) : server_(srv) {}
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    virtual void operator()(const IOMessage&) const {
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        if (server_->getConfigSession()->hasQueuedMsgs()) {
            server_->getConfigSession()->checkCommand();
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        }
    }
private:
    AuthSrv* server_;
};

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AuthSrv::AuthSrv(const bool use_cache, AbstractXfroutClient& xfrout_client) :
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    impl_(new AuthSrvImpl(use_cache, xfrout_client)),
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    checkin_(new ConfigChecker(this)),
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    dns_lookup_(new MessageLookup(this)),
    dns_answer_(new MessageAnswer(this))
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{}
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void
AuthSrv::stop() {
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    impl_->io_service_.stop();
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}

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AuthSrv::~AuthSrv() {
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    delete impl_;
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    delete checkin_;
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    delete dns_lookup_;
    delete dns_answer_;
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}

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namespace {
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class QuestionInserter {
public:
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    QuestionInserter(MessagePtr message) : message_(message) {}
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    void operator()(const QuestionPtr question) {
        message_->addQuestion(question);
    }
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    MessagePtr message_;
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};

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void
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makeErrorMessage(MessagePtr message, OutputBufferPtr buffer,
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                 const Rcode& rcode, 
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                 std::auto_ptr<TSIGContext> tsig_context =
                 std::auto_ptr<TSIGContext>())
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{
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    // extract the parameters that should be kept.
    // XXX: with the current implementation, it's not easy to set EDNS0
    // depending on whether the query had it.  So we'll simply omit it.
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    const qid_t qid = message->getQid();
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    const bool rd = message->getHeaderFlag(Message::HEADERFLAG_RD);
    const bool cd = message->getHeaderFlag(Message::HEADERFLAG_CD);
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    const Opcode& opcode = message->getOpcode();
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    vector<QuestionPtr> questions;

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    // If this is an error to a query or notify, we should also copy the
    // question section.
    if (opcode == Opcode::QUERY() || opcode == Opcode::NOTIFY()) {
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        questions.assign(message->beginQuestion(), message->endQuestion());
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    }
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    message->clear(Message::RENDER);
    message->setQid(qid);
    message->setOpcode(opcode);
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    message->setHeaderFlag(Message::HEADERFLAG_QR);
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    if (rd) {
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        message->setHeaderFlag(Message::HEADERFLAG_RD);
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    }
    if (cd) {
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        message->setHeaderFlag(Message::HEADERFLAG_CD);
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    }
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    for_each(questions.begin(), questions.end(), QuestionInserter(message));
    message->setRcode(rcode);

    MessageRenderer renderer(*buffer);
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    if (tsig_context.get() != NULL) {
        message->toWire(renderer, *tsig_context);
    } else {
        message->toWire(renderer);
    }
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    LOG_DEBUG(auth_logger, DBG_AUTH_MESSAGES, AUTH_SEND_ERROR_RESPONSE)
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              .arg(renderer.getLength()).arg(*message);
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}
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}
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IOService&
AuthSrv::getIOService() {
    return (impl_->io_service_);
}

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void
AuthSrv::setCacheSlots(const size_t slots) {
    impl_->cache_.setSlots(slots);
}

size_t
AuthSrv::getCacheSlots() const {
    return (impl_->cache_.getSlots());
}

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void
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AuthSrv::setXfrinSession(AbstractSession* xfrin_session) {
    impl_->xfrin_session_ = xfrin_session;
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}

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void
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AuthSrv::setConfigSession(ModuleCCSession* config_session) {
    impl_->config_session_ = config_session;
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}

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void
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AuthSrv::setStatisticsSession(AbstractSession* statistics_session) {
    impl_->counters_.setStatisticsSession(statistics_session);
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}

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ModuleCCSession*
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AuthSrv::getConfigSession() const {
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    return (impl_->config_session_);
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}

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AuthSrv::InMemoryClientPtr
AuthSrv::getInMemoryClient(const RRClass& rrclass) {
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    // XXX: for simplicity, we only support the IN class right now.
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    if (rrclass != impl_->memory_client_class_) {
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        isc_throw(InvalidParameter,
                  "Memory data source is not supported for RR class "
                  << rrclass);
    }
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    return (impl_->memory_client_);
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}

void
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AuthSrv::setInMemoryClient(const isc::dns::RRClass& rrclass,
                           InMemoryClientPtr memory_client)
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{
    // XXX: see above
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    if (rrclass != impl_->memory_client_class_) {
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        isc_throw(InvalidParameter,
                  "Memory data source is not supported for RR class "
                  << rrclass);
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    } else if (!impl_->memory_client_ && memory_client) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_OPS, AUTH_MEM_DATASRC_ENABLED)
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                  .arg(rrclass);
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    } else if (impl_->memory_client_ && !memory_client) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_OPS, AUTH_MEM_DATASRC_DISABLED)
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                  .arg(rrclass);
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    }
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    impl_->memory_client_ = memory_client;
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}

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uint32_t
AuthSrv::getStatisticsTimerInterval() const {
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    return (impl_->statistics_timer_.getInterval() / 1000);
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}

void
AuthSrv::setStatisticsTimerInterval(uint32_t interval) {
    if (interval == impl_->statistics_timer_.getInterval()) {
        return;
    }
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    if (interval > 86400) {
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        // It can't occur since the value is checked in
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        // statisticsIntervalConfig::build().
        isc_throw(InvalidParameter, "Too long interval: " << interval);
    }
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    if (interval == 0) {
        impl_->statistics_timer_.cancel();
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        LOG_DEBUG(auth_logger, DBG_AUTH_OPS, AUTH_STATS_TIMER_DISABLED);
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    } else {
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        impl_->statistics_timer_.setup(boost::bind(&AuthSrv::submitStatistics,
                                                   this),
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                                       interval * 1000);
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        LOG_DEBUG(auth_logger, DBG_AUTH_OPS, AUTH_STATS_TIMER_SET)
                  .arg(interval);
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    }
}

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void
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AuthSrv::processMessage(const IOMessage& io_message, MessagePtr message,
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                        OutputBufferPtr buffer, DNSServer* server)
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{
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    InputBuffer request_buffer(io_message.getData(), io_message.getDataSize());

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    // First, check the header part.  If we fail even for the base header,
    // just drop the message.
    try {
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        message->parseHeader(request_buffer);
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        // Ignore all responses.
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        if (message->getHeaderFlag(Message::HEADERFLAG_QR)) {
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            LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_RESPONSE_RECEIVED);
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            server->resume(false);
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            return;
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        }
    } catch (const Exception& ex) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_HEADER_PARSE_FAIL)
                  .arg(ex.what());
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        server->resume(false);
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        return;
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    }

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    try {
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        // Parse the message.
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        message->fromWire(request_buffer);
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    } catch (const DNSProtocolError& error) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_PACKET_PROTOCOL_ERROR)
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                  .arg(error.getRcode().toText()).arg(error.what());
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        makeErrorMessage(message, buffer, error.getRcode());
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        server->resume(true);
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        return;
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    } catch (const Exception& ex) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_PACKET_PARSE_ERROR)
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                  .arg(ex.what());
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        makeErrorMessage(message, buffer, Rcode::SERVFAIL());
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        server->resume(true);
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        return;
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    } // other exceptions will be handled at a higher layer.
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    LOG_DEBUG(auth_logger, DBG_AUTH_MESSAGES, AUTH_PACKET_RECEIVED)
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              .arg(message->toText());
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    // Perform further protocol-level validation.
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    // TSIG first
    // If this is set to something, we know we need to answer with TSIG as well
    std::auto_ptr<TSIGContext> tsig_context;
    const TSIGRecord* tsig_record(message->getTSIGRecord());
    TSIGError tsig_error(TSIGError::NOERROR());

    // Do we do TSIG?
    // The keyring can be null if we're in test
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    if (impl_->keyring_ != NULL && tsig_record != NULL) {
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        tsig_context.reset(new TSIGContext(tsig_record->getName(),
                                           tsig_record->getRdata().
                                                getAlgorithm(),
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                                           **impl_->keyring_));
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        tsig_error = tsig_context->verify(tsig_record, io_message.getData(),
                                          io_message.getDataSize());
    }
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    bool sendAnswer = true;
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    if (tsig_error != TSIGError::NOERROR()) {
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        makeErrorMessage(message, buffer, tsig_error.toRcode(), tsig_context);
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    } else if (message->getOpcode() == Opcode::NOTIFY()) {
        sendAnswer = impl_->processNotify(io_message, message, buffer,
                                          tsig_context);
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    } else if (message->getOpcode() != Opcode::QUERY()) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_UNSUPPORTED_OPCODE)
                  .arg(message->getOpcode().toText());
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        makeErrorMessage(message, buffer, Rcode::NOTIMP(), tsig_context);
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    } else if (message->getRRCount(Message::SECTION_QUESTION) != 1) {
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        makeErrorMessage(message, buffer, Rcode::FORMERR(), tsig_context);
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    } else {
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        ConstQuestionPtr question = *message->beginQuestion();
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        const RRType &qtype = question->getType();
        if (qtype == RRType::AXFR()) {
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            sendAnswer = impl_->processAxfrQuery(io_message, message, buffer,
                                                 tsig_context);
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        } else if (qtype == RRType::IXFR()) {
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            makeErrorMessage(message, buffer, Rcode::NOTIMP(), tsig_context);
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        } else {
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            sendAnswer = impl_->processNormalQuery(io_message, message, buffer,
                                                   tsig_context);
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        }
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    }
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    server->resume(sendAnswer);
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}

bool
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AuthSrvImpl::processNormalQuery(const IOMessage& io_message, MessagePtr message,
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                                OutputBufferPtr buffer,
                                auto_ptr<TSIGContext> tsig_context)
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{
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    ConstEDNSPtr remote_edns = message->getEDNS();
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    const bool dnssec_ok = remote_edns && remote_edns->getDNSSECAwareness();
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    const uint16_t remote_bufsize = remote_edns ? remote_edns->getUDPSize() :
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        Message::DEFAULT_MAX_UDPSIZE;
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    message->makeResponse();
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    message->setHeaderFlag(Message::HEADERFLAG_AA);
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    message->setRcode(Rcode::NOERROR());
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    // Increment query counter.
    incCounter(io_message.getSocket().getProtocol());

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    if (remote_edns) {
        EDNSPtr local_edns = EDNSPtr(new EDNS());
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        local_edns->setDNSSECAwareness(dnssec_ok);
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        local_edns->setUDPSize(AuthSrvImpl::DEFAULT_LOCAL_UDPSIZE);
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        message->setEDNS(local_edns);
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    }
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    try {
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        // If a memory data source is configured call the separate
        // Query::process()
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        const ConstQuestionPtr question = *message->beginQuestion();
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        if (memory_client_ && memory_client_class_ == question->getClass()) {
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            const RRType& qtype = question->getType();
            const Name& qname = question->getName();
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            auth::Query(*memory_client_, qname, qtype, *message).process();
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        } else {
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            datasrc::Query query(*message, cache_, dnssec_ok);
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            data_sources_.doQuery(query);
        }
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    } catch (const Exception& ex) {
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        LOG_ERROR(auth_logger, AUTH_PROCESS_FAIL).arg(ex.what());
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        makeErrorMessage(message, buffer, Rcode::SERVFAIL());
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        return (true);
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    }
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    MessageRenderer renderer(*buffer);
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    const bool udp_buffer =
        (io_message.getSocket().getProtocol() == IPPROTO_UDP);
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    renderer.setLengthLimit(udp_buffer ? remote_bufsize : 65535);
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    if (tsig_context.get() != NULL) {
        message->toWire(renderer, *tsig_context);
    } else {
        message->toWire(renderer);
    }
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    LOG_DEBUG(auth_logger, DBG_AUTH_MESSAGES, AUTH_SEND_NORMAL_RESPONSE)
              .arg(renderer.getLength()).arg(message->toText());
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    return (true);
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}

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bool
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AuthSrvImpl::processAxfrQuery(const IOMessage& io_message, MessagePtr message,
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                              OutputBufferPtr buffer,
                              auto_ptr<TSIGContext> tsig_context)
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{
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    // Increment query counter.
    incCounter(io_message.getSocket().getProtocol());

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    if (io_message.getSocket().getProtocol() == IPPROTO_UDP) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_AXFR_UDP);
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        makeErrorMessage(message, buffer, Rcode::FORMERR(), tsig_context);
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        return (true);
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    }
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    try {
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        if (!xfrout_connected_) {
            xfrout_client_.connect();
            xfrout_connected_ = true;
        }
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        xfrout_client_.sendXfroutRequestInfo(
            io_message.getSocket().getNative(),
            io_message.getData(),
            io_message.getDataSize());
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    } catch (const XfroutError& err) {
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        if (xfrout_connected_) {
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            // disconnect() may trigger an exception, but since we try it
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            // only if we've successfully opened it, it shouldn't happen in
            // normal condition.  Should this occur, we'll propagate it to the
            // upper layer.
            xfrout_client_.disconnect();
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            xfrout_connected_ = false;
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        }
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_AXFR_ERROR)
                  .arg(err.what());
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        makeErrorMessage(message, buffer, Rcode::SERVFAIL(), tsig_context);
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        return (true);
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    }
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    return (false);
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}

bool
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AuthSrvImpl::processNotify(const IOMessage& io_message, MessagePtr message, 
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                           OutputBufferPtr buffer,
                           std::auto_ptr<TSIGContext> tsig_context)
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{
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    // The incoming notify must contain exactly one question for SOA of the
    // zone name.
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    if (message->getRRCount(Message::SECTION_QUESTION) != 1) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_NOTIFY_QUESTIONS)
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                  .arg(message->getRRCount(Message::SECTION_QUESTION));
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        makeErrorMessage(message, buffer, Rcode::FORMERR(), tsig_context);
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        return (true);
    }
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    ConstQuestionPtr question = *message->beginQuestion();
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    if (question->getType() != RRType::SOA()) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_NOTIFY_RRTYPE)
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                  .arg(question->getType().toText());
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        makeErrorMessage(message, buffer, Rcode::FORMERR(), tsig_context);
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        return (true);
    }

    // According to RFC 1996, rcode should be "no error" and AA bit should be
    // on, but we don't check these conditions.  This behavior is compatible
    // with BIND 9.

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    // TODO check with the conf-mgr whether current server is the auth of the
    // zone
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    // In the code that follows, we simply ignore the notify if any internal
    // error happens rather than returning (e.g.) SERVFAIL.  RFC 1996 is
    // silent about such cases, but there doesn't seem to be anything we can
    // improve at the primary server side by sending an error anyway.
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    if (xfrin_session_ == NULL) {
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        LOG_DEBUG(auth_logger, DBG_AUTH_DETAIL, AUTH_NO_XFRIN);
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        return (false);
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    }
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    const string remote_ip_address =
        io_message.getRemoteEndpoint().getAddress().toText();
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    static const string command_template_start =
        "{\"command\": [\"notify\", {\"zone_name\" : \"";
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    static const string command_template_master = "\", \"master\" : \"";
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    static const string command_template_rrclass = "\", \"zone_class\" : \"";
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    static const string command_template_end = "\"}]}";
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    try {
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        ConstElementPtr notify_command = Element::fromJSON(
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                command_template_start + question->getName().toText() +
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                command_template_master + remote_ip_address +
                command_template_rrclass + question->getClass().toText() +
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                command_template_end);
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        const unsigned int seq =
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            xfrin_session_->group_sendmsg(notify_command, "Zonemgr",
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                                          "*", "*");
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        ConstElementPtr env, answer, parsed_answer;
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        xfrin_session_->group_recvmsg(env, answer, false, seq);
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        int rcode;
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        parsed_answer = parseAnswer(rcode, answer);
        if (rcode != 0) {
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            LOG_ERROR(auth_logger, AUTH_ZONEMGR_ERROR)
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                      .arg(parsed_answer->str());
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            return (false);
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        }
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    } catch (const Exception& ex) {
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        LOG_ERROR(auth_logger, AUTH_ZONEMGR_COMMS).arg(ex.what());
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        return (false);
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    }
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    message->makeResponse();
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    message->setHeaderFlag(Message::HEADERFLAG_AA);
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    message->setRcode(Rcode::NOERROR());

    MessageRenderer renderer(*buffer);
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    if (tsig_context.get() != NULL) {
        message->toWire(renderer, *tsig_context);
    } else {
        message->toWire(renderer);
    }
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    return (true);
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}

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void
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AuthSrvImpl::incCounter(const int protocol) {
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    // Increment query counter.
    if (protocol == IPPROTO_UDP) {
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        counters_.inc(AuthCounters::COUNTER_UDP_QUERY);
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    } else if (protocol == IPPROTO_TCP) {
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        counters_.inc(AuthCounters::COUNTER_TCP_QUERY);
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    } else {
        // unknown protocol
        isc_throw(Unexpected, "Unknown protocol: " << protocol);
    }
}

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ConstElementPtr
AuthSrvImpl::setDbFile(ConstElementPtr config) {
    ConstElementPtr answer = isc::config::createAnswer();
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    if (config && config->contains("database_file")) {
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        db_file_ = config->get("database_file")->stringValue();
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    } else if (config_session_ != NULL) {
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        bool is_default;
        string item("database_file");
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        ConstElementPtr value = config_session_->getValue(is_default, item);
        ElementPtr final = Element::createMap();
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        // If the value is the default, and we are running from
        // a specific directory ('from build'), we need to use
        // a different value than the default (which may not exist)
        // (btw, this should not be done here in the end, i think
        //  the from-source script should have a check for this,
        //  but for that we need offline access to config, so for
        //  now this is a decent solution)
        if (is_default && getenv("B10_FROM_BUILD")) {
            value = Element::create(string(getenv("B10_FROM_BUILD")) +
                                    "/bind10_zones.sqlite3");
        }
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        final->set(item, value);
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        config = final;
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        db_file_ = value->stringValue();
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    } else {
        return (answer);
    }