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#ifndef CYGONCE_NS_DNS_DNS_PRIV_H

#define CYGONCE_NS_DNS_DNS_PRIV_H

//=============================================================================

//

//      dns-priv.h

//

//      Private DNS client definitions.

//

//=============================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under    

// the terms of the GNU General Public License as published by the Free     

// Software Foundation; either version 2 or (at your option) any later      

// version.                                                                 

//

// eCos 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 General Public License    

// for more details.                                                        

//

// You should have received a copy of the GNU General Public License        

// along with eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

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// must still be made available in accordance with section (3) of the GNU   

// General Public License v2.                                               

//

// This exception does not invalidate any other reasons why a work based    

// on this file might be covered by the GNU General Public License.         

// -------------------------------------------                              

// ####ECOSGPLCOPYRIGHTEND####                                              

//=============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   andrew.lunn

// Contributors:andrew.lunn, jskov

// Date:        2001-09-18

//

//####DESCRIPTIONEND####

//

//=============================================================================

struct dns_header {

#if (CYG_BYTEORDER == CYG_LSBFIRST)

  unsigned        id :16;         /* query identification number */

  /* fields in third byte */

  unsigned        rd :1;          /* recursion desired */

  unsigned        tc :1;          /* truncated message */

  unsigned        aa :1;          /* authoritive answer */

  unsigned        opcode :4;      /* purpose of message */

  unsigned        qr :1;          /* response flag */

  /* fields in fourth byte */

  unsigned        rcode :4;       /* response code */

  unsigned        cd: 1;          /* checking disabled by resolver */

  unsigned        ad: 1;          /* authentic data from named */

  unsigned        unused :1;      /* unused bits */

  unsigned        ra :1;          /* recursion available */

  /* remaining bytes */

  unsigned        qdcount :16;    /* number of question entries */

  unsigned        ancount :16;    /* number of answer entries */

  unsigned        nscount :16;    /* number of authority entries */

  unsigned        arcount :16;    /* number of resource entries */

#else

  unsigned        id :16;         /* query identification number */

  /* fields in third byte */

  unsigned        qr :1;          /* response flag */

  unsigned        opcode :4;      /* purpose of message */

  unsigned        aa :1;          /* authoritive answer */

  unsigned        tc :1;          /* truncated message */

  unsigned        rd :1;          /* recursion desired */

  /* fields in fourth byte */

  unsigned        ra :1;          /* recursion available */

  unsigned        unused :1;      /* unused bits */

  unsigned        ad: 1;          /* authentic data from named */

  unsigned        cd: 1;          /* checking disabled by resolver */

  unsigned        rcode :4;       /* response code */

  /* remaining bytes */

  unsigned        qdcount :16;    /* number of question entries */

  unsigned        ancount :16;    /* number of answer entries */

  unsigned        nscount :16;    /* number of authority entries */

  unsigned        arcount :16;    /* number of resource entries */

#endif

};

struct resource_record {

  unsigned rr_type : 16; /* Type of resourse */

  unsigned class   : 16; /* Class of resource */

  unsigned ttl     : 32; /* Time to live of this record */

  unsigned rdlength: 16; /* Lenght of data to follow */

  char     rdata [2];   /* Resource DATA */

};

/* Opcodes */

#define DNS_QUERY  0   /* Standard query */

#define DNS_IQUERY 1   /* Inverse query */

#define DNS_STATUS 2   /* Name server status */

#define DNS_NOTIFY 4   /* Zone change notification */

#define DNS_UPDATE 5   /* Zone update message */

/* DNS TYPEs */

#define DNS_TYPE_A     1   /* Host address */

#define DNS_TYPE_NS    2   /* Authoritative name server */

#define DNS_TYPE_CNAME 5   /* Canonical name for an alias */

#define DNS_TYPE_PTR   12  /* Domain name pointer */

#define DNS_TYPE_AAAA  28  /* IPv6 host address */

/* DNS CLASSs */

#define DNS_CLASS_IN   1   /* Internet */

/* DNS reply codes */

#define DNS_REPLY_NOERR      0

#define DNS_REPLY_NAME_ERROR 3

#define MAXDNSMSGSIZE 512

//-----------------------------------------------------------------------------

#endif // CYGONCE_NS_DNS_DNS_PRIV_H

// End of dns-priv.h