dns_client.h

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// Copyright (C) 2013-2020 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef DNS_CLIENT_H
#define DNS_CLIENT_H

#include <d2/d2_update_message.h>

#include <asiolink/io_service.h>
#include <util/buffer.h>

#include <asiodns/io_fetch.h>
#include <dns/tsig.h>

namespace isc {
namespace d2 {

class DNSClient;
typedef boost::shared_ptr<DNSClient> DNSClientPtr;

class DNSClientImpl;

class DNSClient {
public:

    enum Protocol {
        UDP,
        TCP
    };

    enum Status {
        SUCCESS,           
        TIMEOUT,           
        IO_STOPPED,        
        INVALID_RESPONSE,  
        OTHER              
    };

    class Callback {
    public:
        virtual ~Callback() { }

        virtual void operator()(DNSClient::Status status) = 0;
    };

    DNSClient(D2UpdateMessagePtr& response_placeholder, Callback* callback,
              const Protocol proto = UDP);

    ~DNSClient();


private:
    DNSClient(const DNSClient& source);
    DNSClient& operator=(const DNSClient& source);

public:

    static unsigned int getMaxTimeout();

    void doUpdate(asiolink::IOService& io_service,
                  const asiolink::IOAddress& ns_addr,
                  const uint16_t ns_port,
                  D2UpdateMessage& update,
                  const unsigned int wait,
                  const dns::TSIGKeyPtr& tsig_key = dns::TSIGKeyPtr());

private:
    DNSClientImpl* impl_;  
};

} // namespace d2
} // namespace isc

#endif // DNS_CLIENT_H