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   1 /*
   2  * Copyright (c) 1983, 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)nameser.h   8.2 (Berkeley) 2/16/94
  34  * -
  35  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies, and that
  40  * the name of Digital Equipment Corporation not be used in advertising or
  41  * publicity pertaining to distribution of the document or software without
  42  * specific, written prior permission.
  43  *
  44  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  45  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  47  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  48  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  49  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  50  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  51  * SOFTWARE.
  52  * -
  53  * --Copyright--
  54  */
  55
  56 #ifndef _NAMESER_H_
  57 #define _NAMESER_H_
  58
  59 #include <sys/types.h>
  60
  61 /*
  62  * Define constants based on rfc883
  63  */
  64 #define PACKETSZ        512             /* maximum packet size */
  65 #define MAXDNAME        256             /* maximum domain name */
  66 #define MAXCDNAME       255             /* maximum compressed domain name */
  67 #define MAXLABEL        63              /* maximum length of domain label */
  68         /* Number of bytes of fixed size data in query structure */
  69 #define QFIXEDSZ        4
  70         /* number of bytes of fixed size data in resource record */
  71 #define RRFIXEDSZ       10
  72
  73 /*
  74  * Internet nameserver port number
  75  */
  76 #define NAMESERVER_PORT 53
  77
  78 /*
  79  * Currently defined opcodes
  80  */
  81 #define QUERY           0x0             /* standard query */
  82 #define IQUERY          0x1             /* inverse query */
  83 #define STATUS          0x2             /* nameserver status query */
  84 /*#define xxx           0x3             /* 0x3 reserved */
  85         /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
  86 #define UPDATEA         0x9             /* add resource record */
  87 #define UPDATED         0xa             /* delete a specific resource record */
  88 #define UPDATEDA        0xb             /* delete all named resource record */
  89 #define UPDATEM         0xc             /* modify a specific resource record */
  90 #define UPDATEMA        0xd             /* modify all named resource record */
  91
  92 #define ZONEINIT        0xe             /* initial zone transfer */
  93 #define ZONEREF         0xf             /* incremental zone referesh */
  94
  95 /*
  96  * Currently defined response codes
  97  */
  98 #define NOERROR         0               /* no error */
  99 #define FORMERR         1               /* format error */
 100 #define SERVFAIL        2               /* server failure */
 101 #define NXDOMAIN        3               /* non existent domain */
 102 #define NOTIMP          4               /* not implemented */
 103 #define REFUSED         5               /* query refused */
 104         /* non standard */
 105 #define NOCHANGE        0xf             /* update failed to change db */
 106
 107 /*
 108  * Type values for resources and queries
 109  */
 110 #define T_A             1               /* host address */
 111 #define T_NS            2               /* authoritative server */
 112 #define T_MD            3               /* mail destination */
 113 #define T_MF            4               /* mail forwarder */
 114 #define T_CNAME         5               /* connonical name */
 115 #define T_SOA           6               /* start of authority zone */
 116 #define T_MB            7               /* mailbox domain name */
 117 #define T_MG            8               /* mail group member */
 118 #define T_MR            9               /* mail rename name */
 119 #define T_NULL          10              /* null resource record */
 120 #define T_WKS           11              /* well known service */
 121 #define T_PTR           12              /* domain name pointer */
 122 #define T_HINFO         13              /* host information */
 123 #define T_MINFO         14              /* mailbox information */
 124 #define T_MX            15              /* mail routing information */
 125 #define T_TXT           16              /* text strings */
 126 #define T_RP            17              /* responsible person */
 127 #define T_AFSDB         18              /* AFS cell database */
 128 #define T_NSAP          22              /* NSAP address */
 129 #define T_NSAP_PTR      23              /* reverse lookup for NSAP */
 130         /* non standard */
 131 #define T_UINFO         100             /* user (finger) information */
 132 #define T_UID           101             /* user ID */
 133 #define T_GID           102             /* group ID */
 134 #define T_UNSPEC        103             /* Unspecified format (binary data) */
 135         /* Query type values which do not appear in resource records */
 136 #define T_AXFR          252             /* transfer zone of authority */
 137 #define T_MAILB         253             /* transfer mailbox records */
 138 #define T_MAILA         254             /* transfer mail agent records */
 139 #define T_ANY           255             /* wildcard match */
 140
 141 /*
 142  * Values for class field
 143  */
 144
 145 #define C_IN            1               /* the arpa internet */
 146 #define C_CHAOS         3               /* for chaos net (MIT) */
 147 #define C_HS            4               /* for Hesiod name server (MIT) (XXX) */
 148         /* Query class values which do not appear in resource records */
 149 #define C_ANY           255             /* wildcard match */
 150
 151 /*
 152  * Status return codes for T_UNSPEC conversion routines
 153  */
 154 #define CONV_SUCCESS 0
 155 #define CONV_OVERFLOW -1
 156 #define CONV_BADFMT -2
 157 #define CONV_BADCKSUM -3
 158 #define CONV_BADBUFLEN -4
 159
 160 /*
 161  * Structure for query header.
 162  */
 163 typedef struct {
 164         u_int16_t id;           /* query identification number */
 165         u_int8_t  flags1;       /* first byte of flags */
 166         u_int8_t  flags2;       /* second byte of flags */
 167         u_int16_t qdcount;      /* number of question entries */
 168         u_int16_t ancount;      /* number of answer entries */
 169         u_int16_t nscount;      /* number of authority entries */
 170         u_int16_t arcount;      /* number of resource entries */
 171 } HEADER;
 172
 173 /*
 174  * Macros for subfields of flag fields.
 175  */
 176 #define DNS_QR(np)      ((np)->flags1 & 0x80)           /* response flag */
 177 #define DNS_OPCODE(np)  ((((np)->flags1) >> 3) & 0xF)   /* purpose of message */
 178 #define DNS_AA(np)      ((np)->flags1 & 0x04)           /* authoritative answer */
 179 #define DNS_TC(np)      ((np)->flags1 & 0x02)           /* truncated message */
 180 #define DNS_RD(np)      ((np)->flags1 & 0x01)           /* recursion desired */
 181
 182 #define DNS_RA(np)      ((np)->flags2 & 0x80)   /* recursion available */
 183 #define DNS_AD(np)      ((np)->flags2 & 0x20)   /* authentic data from named */
 184 #define DNS_CD(np)      ((np)->flags2 & 0x10)   /* checking disabled by resolver */
 185 #define DNS_RCODE(np)   ((np)->flags2 & 0xF)    /* response code */
 186
 187 /*
 188  * Defines for handling compressed domain names
 189  */
 190 #define INDIR_MASK      0xc0
 191
 192 /*
 193  * Structure for passing resource records around.
 194  */
 195 struct rrec {
 196         int16_t r_zone;                 /* zone number */
 197         int16_t r_class;                /* class number */
 198         int16_t r_type;                 /* type number */
 199         u_int32_t       r_ttl;                  /* time to live */
 200         int     r_size;                 /* size of data area */
 201         char    *r_data;                /* pointer to data */
 202 };
 203
 204 extern  u_int16_t       _getshort();
 205 extern  u_int32_t       _getlong();
 206
 207 /*
 208  * Inline versions of get/put short/long.  Pointer is advanced.
 209  * We also assume that a "u_int16_t" holds 2 "chars"
 210  * and that a "u_int32_t" holds 4 "chars".
 211  *
 212  * These macros demonstrate the property of C whereby it can be
 213  * portable or it can be elegant but never both.
 214  */
 215 #define GETSHORT(s, cp) { \
 216         register u_char *t_cp = (u_char *)(cp); \
 217         (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \
 218         (cp) += 2; \
 219 }
 220
 221 #define GETLONG(l, cp) { \
 222         register u_char *t_cp = (u_char *)(cp); \
 223         (l) = (((u_int32_t)t_cp[0]) << 24) \
 224             | (((u_int32_t)t_cp[1]) << 16) \
 225             | (((u_int32_t)t_cp[2]) << 8) \
 226             | (((u_int32_t)t_cp[3])); \
 227         (cp) += 4; \
 228 }
 229
 230 #define PUTSHORT(s, cp) { \
 231         register u_int16_t t_s = (u_int16_t)(s); \
 232         register u_char *t_cp = (u_char *)(cp); \
 233         *t_cp++ = t_s >> 8; \
 234         *t_cp   = t_s; \
 235         (cp) += 2; \
 236 }
 237
 238 /*
 239  * Warning: PUTLONG --no-longer-- destroys its first argument.  if you
 240  * were depending on this "feature", you will lose.
 241  */
 242 #define PUTLONG(l, cp) { \
 243         register u_int32_t t_l = (u_int32_t)(l); \
 244         register u_char *t_cp = (u_char *)(cp); \
 245         *t_cp++ = t_l >> 24; \
 246         *t_cp++ = t_l >> 16; \
 247         *t_cp++ = t_l >> 8; \
 248         *t_cp   = t_l; \
 249         (cp) += 4; \
 250 }
 251
 252 #endif /* !_NAMESER_H_ */