dns_resolver.h

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/*
**  ClanLib SDK
**  Copyright (c) 1997-2005 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries ClanLib link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/

#ifndef header_dns_resolver
#define header_dns_resolver

#include "dns_resource_record.h"
#include <vector>

class CL_ByteArray;

class CL_DNSResolver
{
public:
        CL_DNSResolver();
        
        ~CL_DNSResolver();

public:

public:
        enum Status
        {
                status_success,
                status_name_not_found,
                status_data_not_found,
                status_timeout,
                status_error
        };

        Status lookup_resource(
                const CL_String &domain_name,
                const CL_String &resource_type,
                std::vector<CL_DNSResourceRecord> &out_records,
                int timeout = 10000);

private:
        Status perform_query(
                const CL_String &domain_name,
                const CL_String &resource_type,
                std::vector<CL_DNSResourceRecord> &out_answer,
                std::vector<CL_DNSResourceRecord> &out_authority,
                std::vector<CL_DNSResourceRecord> &out_additional,
                int timeout,
                const CL_String &dns_server_name);

        bool read_record(CL_ByteArray &packet, int &pos, CL_DNSResourceRecord &out_record);
        
        int next_query_id;
};

#endif

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