* Copyright (c) 1983, 1989 Regents of the University of California.
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
* @(#)nameser.h 5.23 (Berkeley) %G%
* 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 */
/* number of bytes of fixed size data in resource record */
* Internet nameserver port number
#define NAMESERVER_PORT 53
* Currently defined opcodes
#define QUERY 0x0 /* standard query */
#define IQUERY 0x1 /* inverse query */
#define STATUS 0x2 /* nameserver status query */
/*#define xxx 0x3 /* 0x3 reserved */
#define UPDATEA 0x9 /* add resource record */
#define UPDATED 0xa /* delete a specific resource record */
#define UPDATEDA 0xb /* delete all nemed resource record */
#define UPDATEM 0xc /* modify a specific resource record */
#define UPDATEMA 0xd /* modify all named resource record */
#define ZONEINIT 0xe /* initial zone transfer */
#define ZONEREF 0xf /* incremental zone referesh */
* Currently defined response 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 */
#define NOCHANGE 0xf /* update failed to change db */
* Type values for resources and queries
#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 */
#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 */
#define C_IN 1 /* the arpa internet */
#define C_CHAOS 3 /* for chaos net at MIT */
#define C_HS 4 /* for Hesiod name server at MIT */
/* Query class values which do not appear in resource records */
#define C_ANY 255 /* wildcard match */
* Status return codes for T_UNSPEC conversion routines
#define CONV_BADBUFLEN -4
#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */
#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
#if defined(vax) || defined(ns32000) || defined(sun386) || defined(MIPSEL) || \
defined(BIT_ZERO_ON_RIGHT)
#define BYTE_ORDER LITTLE_ENDIAN
#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
defined(MIPSEB) || defined (BIT_ZERO_ON_LEFT)
#define BYTE_ORDER BIG_ENDIAN
/* you must determine what the correct bit order is for your compiler */
* Structure for query header, the order of the fields is machine and
* compiler dependent, in our case, the bits within a byte are assignd
* least significant first, while the order of transmition is most
* significant first. This requires a somewhat confusing rearrangement.
u_short id
; /* query identification number */
#if BYTE_ORDER == BIG_ENDIAN
/* fields in third byte */
u_char qr
:1; /* response flag */
u_char opcode
:4; /* purpose of message */
u_char aa
:1; /* authoritive answer */
u_char tc
:1; /* truncated message */
u_char rd
:1; /* recursion desired */
/* fields in fourth byte */
u_char ra
:1; /* recursion available */
u_char pr
:1; /* primary server required (non standard) */
u_char unused
:2; /* unused bits */
u_char rcode
:4; /* response code */
#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
/* fields in third byte */
u_char rd
:1; /* recursion desired */
u_char tc
:1; /* truncated message */
u_char aa
:1; /* authoritive answer */
u_char opcode
:4; /* purpose of message */
u_char qr
:1; /* response flag */
/* fields in fourth byte */
u_char rcode
:4; /* response code */
u_char unused
:2; /* unused bits */
u_char pr
:1; /* primary server required (non standard) */
u_char ra
:1; /* recursion available */
u_short qdcount
; /* number of question entries */
u_short ancount
; /* number of answer entries */
u_short nscount
; /* number of authority entries */
u_short arcount
; /* number of resource entries */
* Defines for handling compressed domain names
* Structure for passing resource records around.
short r_zone
; /* zone number */
short r_class
; /* class number */
short r_type
; /* type number */
u_long r_ttl
; /* time to live */
int r_size
; /* size of data area */
char *r_data
; /* pointer to data */
extern u_short
_getshort();
extern u_long
_getlong();
* Inline versions of get/put short/long.
* Pointer is advanced; we assume that both arguments
* are lvalues and will already be in registers.
#define GETSHORT(s, cp) { \
#define GETLONG(l, cp) { \
(l) |= *(cp)++; (l) <<= 8; \
(l) |= *(cp)++; (l) <<= 8; \
#define PUTSHORT(s, cp) { \
* Warning: PUTLONG destroys its first argument.
#define PUTLONG(l, cp) { \
(cp) += sizeof(u_long); \