usr/src/lib/libresolv/arpa/nameser.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1994 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * Portions of this source code were derived from Berkeley 4.3 BSD
  32  * under license from the Regents of the University of California.
  33  */
  34
  35 #ifndef _ARPA_NAMESER_H
  36 #define _ARPA_NAMESER_H
  37
  38 #pragma ident   "%Z%%M% %I%     %E% SMI"
  39
  40 #include <sys/isa_defs.h>
  41
  42 #ifdef  __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 /*
  47  * Define constants based on rfc883
  48  */
  49 #define PACKETSZ        512             /* maximum packet size */
  50 #define MAXDNAME        256             /* maximum domain name */
  51 #define MAXCDNAME       255             /* maximum compressed domain name */
  52 #define MAXLABEL        63              /* maximum length of domain label */
  53         /* Number of bytes of fixed size data in query structure */
  54 #define QFIXEDSZ        4
  55         /* number of bytes of fixed size data in resource record */
  56 #define RRFIXEDSZ       10
  57
  58 /*
  59  * Internet nameserver port number
  60  */
  61 #define NAMESERVER_PORT 53
  62
  63 /*
  64  * Currently defined opcodes
  65  */
  66 #define QUERY           0x0             /* standard query */
  67 #define IQUERY          0x1             /* inverse query */
  68 #define STATUS          0x2             /* nameserver status query */
  69 /* #define      xxx             0x3 */  /* 0x3 reserved */
  70         /* non standard */
  71 #define UPDATEA         0x9             /* add resource record */
  72 #define UPDATED         0xa             /* delete a specific resource record */
  73 #define UPDATEDA        0xb             /* delete all nemed resource record */
  74 #define UPDATEM         0xc             /* modify a specific resource record */
  75 #define UPDATEMA        0xd             /* modify all named resource record */
  76
  77 #define ZONEINIT        0xe             /* initial zone transfer */
  78 #define ZONEREF         0xf             /* incremental zone referesh */
  79
  80 /*
  81  * Currently defined response codes
  82  */
  83 #define NOERROR         0               /* no error */
  84 #define FORMERR         1               /* format error */
  85 #define SERVFAIL        2               /* server failure */
  86 #define NXDOMAIN        3               /* non existent domain */
  87 #define NOTIMP          4               /* not implemented */
  88 #define REFUSED         5               /* query refused */
  89         /* non standard */
  90 #define NOCHANGE        0xf             /* update failed to change db */
  91
  92 /*
  93  * Type values for resources and queries
  94  */
  95 #define T_A             1               /* host address */
  96 #define T_NS            2               /* authoritative server */
  97 #define T_MD            3               /* mail destination */
  98 #define T_MF            4               /* mail forwarder */
  99 #define T_CNAME         5               /* connonical name */
 100 #define T_SOA           6               /* start of authority zone */
 101 #define T_MB            7               /* mailbox domain name */
 102 #define T_MG            8               /* mail group member */
 103 #define T_MR            9               /* mail rename name */
 104 #define T_NULL          10              /* null resource record */
 105 #define T_WKS           11              /* well known service */
 106 #define T_PTR           12              /* domain name pointer */
 107 #define T_HINFO         13              /* host information */
 108 #define T_MINFO         14              /* mailbox information */
 109 #define T_MX            15              /* mail routing information */
 110 #define T_TXT           16              /* text strings */
 111         /* non standard */
 112 #define T_UINFO         100             /* user (finger) information */
 113 #define T_UID           101             /* user ID */
 114 #define T_GID           102             /* group ID */
 115 #define T_UNSPEC        103             /* Unspecified format (binary data) */
 116         /* Query type values which do not appear in resource records */
 117 #define T_AXFR          252             /* transfer zone of authority */
 118 #define T_MAILB         253             /* transfer mailbox records */
 119 #define T_MAILA         254             /* transfer mail agent records */
 120 #define T_ANY           255             /* wildcard match */
 121
 122 /*
 123  * Values for class field
 124  */
 125
 126 #define C_IN            1               /* the arpa internet */
 127 #define C_CHAOS         3               /* for chaos net at MIT */
 128 #define C_HS            4               /* for Hesiod name server at MIT */
 129         /* Query class values which do not appear in resource records */
 130 #define C_ANY           255             /* wildcard match */
 131
 132 /*
 133  * Status return codes for T_UNSPEC conversion routines
 134  */
 135 #define CONV_SUCCESS 0
 136 #define CONV_OVERFLOW -1
 137 #define CONV_BADFMT -2
 138 #define CONV_BADCKSUM -3
 139 #define CONV_BADBUFLEN -4
 140
 141 /*
 142  * Structure for query header, the order of the fields is machine and
 143  * compiler dependent, in our case, the bits within a byte are assignd
 144  * least significant first, while the order of transmition is most
 145  * significant first.  This requires a somewhat confusing rearrangement.
 146  */
 147
 148 typedef struct {
 149         u_short id;             /* query identification number */
 150 #if defined(_BIT_FIELDS_HTOL) || defined(BIT_ZERO_ON_LEFT)
 151         /* Bit zero on left:  SPARC and similar architectures */
 152                         /* fields in third byte */
 153         u_char  qr:1;           /* response flag */
 154         u_char  opcode:4;       /* purpose of message */
 155         u_char  aa:1;           /* authoritive answer */
 156         u_char  tc:1;           /* truncated message */
 157         u_char  rd:1;           /* recursion desired */
 158                         /* fields in fourth byte */
 159         u_char  ra:1;           /* recursion available */
 160         u_char  pr:1;           /* primary server required (non standard) */
 161         u_char  unused:2;       /* unused bits */
 162         u_char  rcode:4;        /* response code */
 163 #else
 164 #if defined(_BIT_FIELDS_LTOH) || defined(BIT_ZERO_ON_RIGHT)
 165         /* Bit zero on right:  Intel x86 and similar architectures */
 166                         /* fields in third byte */
 167         u_char  rd:1;           /* recursion desired */
 168         u_char  tc:1;           /* truncated message */
 169         u_char  aa:1;           /* authoritive answer */
 170         u_char  opcode:4;       /* purpose of message */
 171         u_char  qr:1;           /* response flag */
 172                         /* fields in fourth byte */
 173         u_char  rcode:4;        /* response code */
 174         u_char  unused:2;       /* unused bits */
 175         u_char  pr:1;           /* primary server required (non standard) */
 176         u_char  ra:1;           /* recursion available */
 177 #else
 178         /* you must determine what the correct bit order is for your compiler */
 179         UNDEFINED_BIT_ORDER;
 180 #endif
 181 #endif
 182                         /* remaining bytes */
 183         u_short qdcount;        /* number of question entries */
 184         u_short ancount;        /* number of answer entries */
 185         u_short nscount;        /* number of authority entries */
 186         u_short arcount;        /* number of resource entries */
 187 } HEADER;
 188
 189 /*
 190  * Defines for handling compressed domain names
 191  */
 192 #define INDIR_MASK      0xc0
 193
 194 /*
 195  * Structure for passing resource records around.
 196  */
 197 struct rrec {
 198         short   r_zone;                 /* zone number */
 199         short   r_class;                /* class number */
 200         short   r_type;                 /* type number */
 201         u_long  r_ttl;                  /* time to live */
 202         int     r_size;                 /* size of data area */
 203         char    *r_data;                /* pointer to data */
 204 };
 205
 206 extern  u_short _getshort();
 207 extern  u_long  _getlong();
 208
 209 /*
 210  * Inline versions of get/put short/long.
 211  * Pointer is advanced; we assume that both arguments
 212  * are lvalues and will already be in registers.
 213  * cp MUST be u_char *.
 214  */
 215 #define GETSHORT(s, cp) { \
 216         (s) = *(cp)++ << 8; \
 217         (s) |= *(cp)++; \
 218 }
 219
 220 #define GETLONG(l, cp) { \
 221         (l) = *(cp)++ << 8; \
 222         (l) |= *(cp)++; (l) <<= 8; \
 223         (l) |= *(cp)++; (l) <<= 8; \
 224         (l) |= *(cp)++; \
 225 }
 226
 227
 228 #define PUTSHORT(s, cp) { \
 229         *(cp)++ = (s) >> 8; \
 230         *(cp)++ = (s); \
 231 }
 232
 233 /*
 234  * Warning: PUTLONG destroys its first argument.
 235  */
 236 #define PUTLONG(l, cp) { \
 237         (cp)[3] = l; \
 238         (cp)[2] = (l >>= 8); \
 239         (cp)[1] = (l >>= 8); \
 240         (cp)[0] = l >> 8; \
 241         (cp) += sizeof (u_long); \
 242 }
 243
 244 #ifdef  __cplusplus
 245 }
 246 #endif
 247
 248 #endif /* _ARPA_NAMESER_H */