AsyncResolverGetHostByName.h

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/*  AsyncResolverGetHostByName.h - asynchronous gethostbyname
    Copyright (C) 2004 Mark Weaver
    Written by Mark Weaver <mark@npsl.co.uk>

    Part of the Open-Win32 library.
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the
    Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA  02111-1307, USA.
*/

/* Copyright 1998 by the Massachusetts Institute of Technology.
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting
 * documentation, and that the name of M.I.T. not be used in
 * advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 */

#ifndef OW32_AsyncResolverGetHostByName_h
#define OW32_AsyncResolverGetHostByName_h

#include <OW32/AsyncResolverSearch.h>

namespace OW32
{

class OW32_LIB_EXPORT CAsyncResolverGetHostByName : 
    public CAsyncResolverCallback
{
public:
    CAsyncResolverGetHostByName(CAsyncResolver *pParent, CAsyncResolverHostCallback *pCallback, void *callbackContext = NULL) :
        m_pParent(pParent),
        m_pCallback(pCallback),
        m_callbackContext(callbackContext),
        m_lookup(0)
    {
    }

    void gethostbyname(const char *name, int family);

    virtual void OnAnswer(void *context, AsyncResolverError status, unsigned char *abuf, size_t alen);

private:
    CAsyncResolverGetHostByName(const CAsyncResolverGetHostByName &);
    CAsyncResolverGetHostByName& operator=(const CAsyncResolverGetHostByName &);

    void nextLookup();

    AsyncResolverError parse_a_reply(const unsigned char *abuf, size_t alen,
               struct hostent **host);
    int fake_hostent(const char *name);

    std::string                 m_name;
    size_t                      m_lookup;
    CAsyncResolver              *m_pParent;
    CAsyncResolverHostCallback  *m_pCallback;
    void                        *m_callbackContext;
};

} // namespace OW32

#endif // OW32_AsyncResolverGetHostByName_h

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