Listing 1.9
RDATA Address Records

/* RDATA NB_FLAGS. */
#define GROUP_BIT     0x8000  /* Group indicator      */
#define ONT_B         0x0000  /* Broadcast node       */
#define ONT_P         0x2000  /* Point-to-point node  */
#define ONT_M         0x4000  /* Mixed mode node      */
#define ONT_H         0x6000  /* MS Hybrid mode node  */
#define ONT_MASK      0x6000  /* Mask                 */

/* RDATA NAME_FLAGS. */
#define DRG           0x0100  /* Deregister.          */
#define CNF           0x0800  /* Conflict.            */
#define ACT           0x0400  /* Active.              */
#define PRM           0x0200  /* Permanent.           */

#include <string.h>     /* For memcpy() */
#include <netinet/in.h> /* htons(), ntohs(), etc. */

#include "NS_RDaddr.h"


int Put_RDLength( uchar *rrec,
                  int    offset,
                  ushort rdlen )
  /* ---------------------------------------------------- **
   * Set the value of the RDLENGTH field.
   * ---------------------------------------------------- **
   */
  {
  rdlen = htons( rdlen );

  (void)memcpy( &(rrec[offset]), &rdlen, 2 );
  return( 2 );
  } /* Put_RDLength */

int Put_RD_Addr( uchar         *rrec,
                 int            offset,
                 ushort         nb_flags,
                 struct in_addr nb_addr )
  /* ---------------------------------------------------- **
   * Write IP NB_FLAGS and NB_ADDRESS fields to the
   * packet buffer.
   *
   * See inet(3) on any Linux/Unix/BSD system for more
   * information on 'struct in_addr'.
   * ---------------------------------------------------- **
   */
  {
  nb_flags = htons( nb_flags );
  (void)memcpy( &(rrec[offset]), &nb_flags, 2 );
  (void)memcpy( &(rrec[offset+2]), &nb_addr.s_addr, 4 );
  return( 6 );
  } /* Put_RD_Addr */


ushort Get_RDLength( const uchar *rrec, int offset )
  /* ---------------------------------------------------- **
   * Read the RDLENGTH field to find out how big the
   * RDATA field is.
   * ---------------------------------------------------- **
   */
  {
  ushort tmp;

  (void)memcpy( &tmp, &(rrec[offset]), 2 );
  return( ntohs( tmp ) );
  } /* Get_RDLength */

ushort Get_RD_NB_Flags( const uchar *rrec, int offset )
  /* ---------------------------------------------------- **
   * Read the NB_FLAGS field from an RDATA record.
   * ---------------------------------------------------- **
   */
  {
  ushort tmp;

  (void)memcpy( &tmp, &(rrec[offset]), 2 );
  return( ntohs( tmp ) );
  } /* Get_RD_NB_Flags */

struct in_addr Get_RD_NB_Addr( const uchar *rrec, int offset )
  /* ---------------------------------------------------- **
   * Read the NB_ADDRESS field from an RDATA record.
   * ---------------------------------------------------- **
   */
  {
  ulong          tmp;
  struct in_addr tmp_addr;

  (void)memcpy( &tmp, &(rrec[offset]), 4 );
  tmp_addr.s_addr = ntohl( tmp );
  return( tmp_addr );
  } /* Get_RD_NB_Addr */

$Revision: 1.11 $ $Date: 2003/02/18 21:43:58 $

Copyright © 1999-2003 Christopher R. Hertel  Released under the terms of the LGPL