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Annotation of 43BSDReno/include/arpa/nameser.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983, 1989 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  *
        !            19:  *     @(#)nameser.h   5.24 (Berkeley) 6/1/90
        !            20:  */
        !            21: 
        !            22: /*
        !            23:  * Define constants based on rfc883
        !            24:  */
        !            25: #define PACKETSZ       512             /* maximum packet size */
        !            26: #define MAXDNAME       256             /* maximum domain name */
        !            27: #define MAXCDNAME      255             /* maximum compressed domain name */
        !            28: #define MAXLABEL       63              /* maximum length of domain label */
        !            29:        /* Number of bytes of fixed size data in query structure */
        !            30: #define QFIXEDSZ       4
        !            31:        /* number of bytes of fixed size data in resource record */
        !            32: #define RRFIXEDSZ      10
        !            33: 
        !            34: /*
        !            35:  * Internet nameserver port number
        !            36:  */
        !            37: #define NAMESERVER_PORT        53
        !            38: 
        !            39: /*
        !            40:  * Currently defined opcodes
        !            41:  */
        !            42: #define QUERY          0x0             /* standard query */
        !            43: #define IQUERY         0x1             /* inverse query */
        !            44: #define STATUS         0x2             /* nameserver status query */
        !            45: /*#define xxx          0x3             /* 0x3 reserved */
        !            46:        /* non standard */
        !            47: #define UPDATEA                0x9             /* add resource record */
        !            48: #define UPDATED                0xa             /* delete a specific resource record */
        !            49: #define UPDATEDA       0xb             /* delete all nemed resource record */
        !            50: #define UPDATEM                0xc             /* modify a specific resource record */
        !            51: #define UPDATEMA       0xd             /* modify all named resource record */
        !            52: 
        !            53: #define ZONEINIT       0xe             /* initial zone transfer */
        !            54: #define ZONEREF                0xf             /* incremental zone referesh */
        !            55: 
        !            56: /*
        !            57:  * Currently defined response codes
        !            58:  */
        !            59: #define NOERROR                0               /* no error */
        !            60: #define FORMERR                1               /* format error */
        !            61: #define SERVFAIL       2               /* server failure */
        !            62: #define NXDOMAIN       3               /* non existent domain */
        !            63: #define NOTIMP         4               /* not implemented */
        !            64: #define REFUSED                5               /* query refused */
        !            65:        /* non standard */
        !            66: #define NOCHANGE       0xf             /* update failed to change db */
        !            67: 
        !            68: /*
        !            69:  * Type values for resources and queries
        !            70:  */
        !            71: #define T_A            1               /* host address */
        !            72: #define T_NS           2               /* authoritative server */
        !            73: #define T_MD           3               /* mail destination */
        !            74: #define T_MF           4               /* mail forwarder */
        !            75: #define T_CNAME                5               /* connonical name */
        !            76: #define T_SOA          6               /* start of authority zone */
        !            77: #define T_MB           7               /* mailbox domain name */
        !            78: #define T_MG           8               /* mail group member */
        !            79: #define T_MR           9               /* mail rename name */
        !            80: #define T_NULL         10              /* null resource record */
        !            81: #define T_WKS          11              /* well known service */
        !            82: #define T_PTR          12              /* domain name pointer */
        !            83: #define T_HINFO                13              /* host information */
        !            84: #define T_MINFO                14              /* mailbox information */
        !            85: #define T_MX           15              /* mail routing information */
        !            86: #define T_TXT          16              /* text strings */
        !            87:        /* non standard */
        !            88: #define T_UINFO                100             /* user (finger) information */
        !            89: #define T_UID          101             /* user ID */
        !            90: #define T_GID          102             /* group ID */
        !            91: #define T_UNSPEC       103             /* Unspecified format (binary data) */
        !            92:        /* Query type values which do not appear in resource records */
        !            93: #define T_AXFR         252             /* transfer zone of authority */
        !            94: #define T_MAILB                253             /* transfer mailbox records */
        !            95: #define T_MAILA                254             /* transfer mail agent records */
        !            96: #define T_ANY          255             /* wildcard match */
        !            97: 
        !            98: /*
        !            99:  * Values for class field
        !           100:  */
        !           101: 
        !           102: #define C_IN           1               /* the arpa internet */
        !           103: #define C_CHAOS                3               /* for chaos net at MIT */
        !           104: #define C_HS           4               /* for Hesiod name server at MIT */
        !           105:        /* Query class values which do not appear in resource records */
        !           106: #define C_ANY          255             /* wildcard match */
        !           107: 
        !           108: /*
        !           109:  * Status return codes for T_UNSPEC conversion routines
        !           110:  */
        !           111: #define CONV_SUCCESS 0
        !           112: #define CONV_OVERFLOW -1
        !           113: #define CONV_BADFMT -2
        !           114: #define CONV_BADCKSUM -3
        !           115: #define CONV_BADBUFLEN -4
        !           116: 
        !           117: #ifndef BYTE_ORDER
        !           118: #define        LITTLE_ENDIAN   1234    /* least-significant byte first (vax) */
        !           119: #define        BIG_ENDIAN      4321    /* most-significant byte first (IBM, net) */
        !           120: #define        PDP_ENDIAN      3412    /* LSB first in word, MSW first in long (pdp) */
        !           121: 
        !           122: #if defined(vax) || defined(ns32000) || defined(sun386) || defined(MIPSEL) || \
        !           123:     defined(BIT_ZERO_ON_RIGHT)
        !           124: #define BYTE_ORDER     LITTLE_ENDIAN
        !           125: 
        !           126: #endif
        !           127: #if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
        !           128:     defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
        !           129:     defined(MIPSEB) || defined (BIT_ZERO_ON_LEFT)
        !           130: #define BYTE_ORDER     BIG_ENDIAN
        !           131: #endif
        !           132: #endif /* BYTE_ORDER */
        !           133: 
        !           134: #ifndef BYTE_ORDER
        !           135:        /* you must determine what the correct bit order is for your compiler */
        !           136:        UNDEFINED_BIT_ORDER;
        !           137: #endif
        !           138: /*
        !           139:  * Structure for query header, the order of the fields is machine and
        !           140:  * compiler dependent, in our case, the bits within a byte are assignd 
        !           141:  * least significant first, while the order of transmition is most 
        !           142:  * significant first.  This requires a somewhat confusing rearrangement.
        !           143:  */
        !           144: 
        !           145: typedef struct {
        !           146:        u_short id;             /* query identification number */
        !           147: #if BYTE_ORDER == BIG_ENDIAN
        !           148:                        /* fields in third byte */
        !           149:        u_char  qr:1;           /* response flag */
        !           150:        u_char  opcode:4;       /* purpose of message */
        !           151:        u_char  aa:1;           /* authoritive answer */
        !           152:        u_char  tc:1;           /* truncated message */
        !           153:        u_char  rd:1;           /* recursion desired */
        !           154:                        /* fields in fourth byte */
        !           155:        u_char  ra:1;           /* recursion available */
        !           156:        u_char  pr:1;           /* primary server required (non standard) */
        !           157:        u_char  unused:2;       /* unused bits */
        !           158:        u_char  rcode:4;        /* response code */
        !           159: #endif
        !           160: #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
        !           161:                        /* fields in third byte */
        !           162:        u_char  rd:1;           /* recursion desired */
        !           163:        u_char  tc:1;           /* truncated message */
        !           164:        u_char  aa:1;           /* authoritive answer */
        !           165:        u_char  opcode:4;       /* purpose of message */
        !           166:        u_char  qr:1;           /* response flag */
        !           167:                        /* fields in fourth byte */
        !           168:        u_char  rcode:4;        /* response code */
        !           169:        u_char  unused:2;       /* unused bits */
        !           170:        u_char  pr:1;           /* primary server required (non standard) */
        !           171:        u_char  ra:1;           /* recursion available */
        !           172: #endif
        !           173:                        /* remaining bytes */
        !           174:        u_short qdcount;        /* number of question entries */
        !           175:        u_short ancount;        /* number of answer entries */
        !           176:        u_short nscount;        /* number of authority entries */
        !           177:        u_short arcount;        /* number of resource entries */
        !           178: } HEADER;
        !           179: 
        !           180: /*
        !           181:  * Defines for handling compressed domain names
        !           182:  */
        !           183: #define INDIR_MASK     0xc0
        !           184: 
        !           185: /*
        !           186:  * Structure for passing resource records around.
        !           187:  */
        !           188: struct rrec {
        !           189:        short   r_zone;                 /* zone number */
        !           190:        short   r_class;                /* class number */
        !           191:        short   r_type;                 /* type number */
        !           192:        u_long  r_ttl;                  /* time to live */
        !           193:        int     r_size;                 /* size of data area */
        !           194:        char    *r_data;                /* pointer to data */
        !           195: };
        !           196: 
        !           197: extern u_short _getshort();
        !           198: extern u_long  _getlong();
        !           199: 
        !           200: /*
        !           201:  * Inline versions of get/put short/long.
        !           202:  * Pointer is advanced; we assume that both arguments
        !           203:  * are lvalues and will already be in registers.
        !           204:  * cp MUST be u_char *.
        !           205:  */
        !           206: #define GETSHORT(s, cp) { \
        !           207:        (s) = *(cp)++ << 8; \
        !           208:        (s) |= *(cp)++; \
        !           209: }
        !           210: 
        !           211: #define GETLONG(l, cp) { \
        !           212:        (l) = *(cp)++ << 8; \
        !           213:        (l) |= *(cp)++; (l) <<= 8; \
        !           214:        (l) |= *(cp)++; (l) <<= 8; \
        !           215:        (l) |= *(cp)++; \
        !           216: }
        !           217: 
        !           218: 
        !           219: #define PUTSHORT(s, cp) { \
        !           220:        *(cp)++ = (s) >> 8; \
        !           221:        *(cp)++ = (s); \
        !           222: }
        !           223: 
        !           224: /*
        !           225:  * Warning: PUTLONG destroys its first argument.
        !           226:  */
        !           227: #define PUTLONG(l, cp) { \
        !           228:        (cp)[3] = l; \
        !           229:        (cp)[2] = (l >>= 8); \
        !           230:        (cp)[1] = (l >>= 8); \
        !           231:        (cp)[0] = l >> 8; \
        !           232:        (cp) += sizeof(u_long); \
        !           233: }

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