dns.h

/*
  Copyright (c) 2005-2008 by Jakob Schroeter <js@camaya.net>
  This file is part of the gloox library. http://camaya.net/gloox

  This software is distributed under a license. The full license
  agreement can be found in the file LICENSE in this distribution.
  This software may not be copied, modified, sold or distributed
  other than expressed in the named license agreement.

  This software is distributed without any warranty.
*/


#ifndef DNS_H__
#define DNS_H__

#include "macros.h"
#include "logsink.h"

#ifdef __MINGW32__
# include <windows.h>
# include <windns.h>
#endif

#ifdef HAVE_ARPA_NAMESER_H
# include <arpa/nameser.h>
#endif

#ifdef __APPLE__
# include <arpa/nameser_compat.h>
#endif

#ifndef NS_MAXDNAME
# define NS_MAXDNAME 1025
#endif

#ifndef NS_PACKETSZ
# define NS_PACKETSZ 512
#endif

#ifdef HAVE_GETADDRINFO
# include <sys/types.h>
# include <sys/socket.h>
# include <netdb.h>
#endif

#include <string>
#include <map>

namespace gloox
{

  class GLOOX_API DNS
  {
    public:

      typedef std::map<std::string, int> HostMap;

      static HostMap resolve( const std::string& service, const std::string& proto,
                              const std::string& domain, const LogSink& logInstance );

      static HostMap resolve( const std::string& domain, const LogSink& logInstance )
        { return resolve( "xmpp-client", "tcp", domain, logInstance ); }

      static int connect( const std::string& host, const LogSink& logInstance );

      static int connect( const std::string& host, unsigned short port, const LogSink& logInstance );

      static int getSocket();

      static void closeSocket( int fd );

    private:
      static int getSocket( int af, int socktype, int proto );

      static HostMap defaultHostMap( const std::string& domain, const LogSink& logInstance );
      static void cleanup();

      struct buffer
      {
        unsigned char buf[NS_PACKETSZ];
        int len;
      };
      typedef unsigned char name[NS_MAXDNAME];
  };

}

#endif // DNS_H__

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