nameser.h

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/*
 * Copyright (c) 1983, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)nameser.h   5.24 (Berkeley) 6/1/90
 */

/*
server/ip/gen/nameser.h

Created Sept 18, 1991 by Philip Homburg
*/

#ifndef __SERVER__IP__GEN__NAEMSER_H__
#define __SERVER__IP__GEN__NAEMSER_H__

typedef struct dns_hdr
{
        u16_t dh_id;
        u8_t dh_flag1;
        u8_t dh_flag2;
        u16_t dh_qdcount;
        u16_t dh_ancount;
        u16_t dh_nscount;
        u16_t dh_arcount;
} dns_hdr_t;

typedef dns_hdr_t HEADER;

#define DHF_QR          0x80
#define DHF_OPCODE      0x78
#define DHF_AA          0x04
#define DHF_TC          0x02
#define DHF_RD          0x01

#define DHF_RA          0x80
#define DHF_PR          0x40
#define DHF_UNUSED      0x30
#define DHF_RCODE       0x0F

/*
Define constants based on rfc883
*/
#define PACKETSZ        512             /* maximum packet size */
#define MAXDNAME        256             /* maximum domain name */
#define MAXCDNAME       255             /* maximum compressed domain name */
#define MAXLABEL        63              /* maximum length of domain label */
        /* Number of bytes of fixed size data in query structure */
#define QFIXEDSZ        4
        /* number of bytes of fixed size data in resource record */
#define RRFIXEDSZ       10
#define INDIR_MASK      0xc0
                        /* Defines for handling compressed domain names */

/*
Opcodes for DNS
*/

#define QUERY           0x0                     /* standard query */
#define IQUERY          0x1                     /* inverse query */

/*
Error codes
*/
#define NOERROR         0                       /* no error */
#define FORMERR         1                       /* format error */
#define SERVFAIL        2                       /* server failure */
#define NXDOMAIN        3                       /* non existent domain */
#define NOTIMP          4                       /* not implemented */
#define REFUSED         5                       /* query refused */
        /* non standard */
#define NOCHANGE        0xf                     /* update failed to change db */

/* Valid types */

#define T_A             1               /* host address */
#define T_NS            2               /* authoritative server */
#define T_MD            3               /* mail destination */
#define T_MF            4               /* mail forwarder */
#define T_CNAME         5               /* connonical name */
#define T_SOA           6               /* start of authority zone */
#define T_MB            7               /* mailbox domain name */
#define T_MG            8               /* mail group member */
#define T_MR            9               /* mail rename name */
#define T_NULL          10              /* null resource record */
#define T_WKS           11              /* well known service */
#define T_PTR           12              /* domain name pointer */
#define T_HINFO         13              /* host information */
#define T_MINFO         14              /* mailbox information */
#define T_MX            15              /* mail routing information */
#define T_TXT           16              /* text strings */
        /* non standard */
#define T_UINFO         100             /* user (finger) information */
#define T_UID           101             /* user ID */
#define T_GID           102             /* group ID */
#define T_UNSPEC        103             /* Unspecified format (binary data) */
        /* Query type values which do not appear in resource records */
#define T_AXFR          252             /* transfer zone of authority */
#define T_MAILB         253             /* transfer mailbox records */
#define T_MAILA         254             /* transfer mail agent records */
#define T_ANY           255             /* wildcard match */

/* Valid classes */

#define C_IN            1                       /* the internet */
#define C_CHAOS         3                       /* for chaos net (MIT) */
#define C_HS            4               /* for Hesiod name server at MIT */

#define C_ANY           255                     /* wildcard */

#endif /* __SERVER__IP__GEN__NAEMSER_H__ */

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